#include "yaffs_ecc.h"
-/* Robustification (if it ever comes about...) */
-static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block);
-static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
- int erased_ok);
-static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
- const u8 * data,
- const struct yaffs_ext_tags *tags);
-static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
- const struct yaffs_ext_tags *tags);
-
-/* Other local prototypes */
-static void yaffs_update_parent(struct yaffs_obj *obj);
-static int yaffs_unlink_obj(struct yaffs_obj *obj);
-static int yaffs_obj_cache_dirty(struct yaffs_obj *obj);
-
-static int yaffs_write_new_chunk(struct yaffs_dev *dev,
- const u8 * buffer,
- struct yaffs_ext_tags *tags, int use_reserver);
-
-static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
- enum yaffs_obj_type type);
-
-static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
- struct yaffs_xattr_mod *xmod);
-
-static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj);
-static int yaffs_generic_obj_del(struct yaffs_obj *in);
-
-static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk);
-
-static int yaffs_unlink_worker(struct yaffs_obj *obj);
-
-static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
- int chunk_obj);
-
-static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
- struct yaffs_block_info **block_ptr);
-
-static void yaffs_check_obj_details_loaded(struct yaffs_obj *in);
+/* Forward declarations */
-static void yaffs_invalidate_whole_cache(struct yaffs_obj *in);
-static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object,
- int chunk_id);
-static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags);
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+ const u8 * buffer, int n_bytes, int use_reserve);
-static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
- int nand_chunk,
- const u8 * data,
- struct yaffs_ext_tags *tags);
-static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
- const YCHAR * oh_name, int buff_size);
-static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
- const YCHAR * name);
/* Function to calculate chunk and offset */
for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
dev->temp_buffer[i].line = 0; /* not in use */
dev->temp_buffer[i].buffer = buf =
- YMALLOC_DMA(dev->param.total_bytes_per_chunk);
+ kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
}
return buf ? YAFFS_OK : YAFFS_FAIL;
*/
dev->unmanaged_buffer_allocs++;
- return YMALLOC(dev->data_bytes_per_chunk);
+ return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
}
T(YAFFS_TRACE_BUFFERS,
(TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
line_no));
- YFREE(buffer);
+ kfree(buffer);
dev->unmanaged_buffer_deallocs++;
}
return 0;
}
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+ const u8 * data,
+ const struct yaffs_ext_tags *tags)
+{
+ dev = dev;
+ nand_chunk = nand_chunk;
+ data = data;
+ tags = tags;
+}
+
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+ const struct yaffs_ext_tags *tags)
+{
+ dev = dev;
+ nand_chunk = nand_chunk;
+ tags = tags;
+}
+
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+ struct yaffs_block_info *bi)
+{
+ if (!bi->gc_prioritise) {
+ bi->gc_prioritise = 1;
+ dev->has_pending_prioritised_gc = 1;
+ bi->chunk_error_strikes++;
+
+ if (bi->chunk_error_strikes > 3) {
+ bi->needs_retiring = 1; /* Too many stikes, so retire this */
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: Block struck out" TENDSTR)));
+
+ }
+ }
+}
+
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+ int erased_ok)
+{
+ int flash_block = nand_chunk / dev->param.chunks_per_block;
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+ yaffs_handle_chunk_error(dev, bi);
+
+ if (erased_ok) {
+ /* Was an actual write failure, so mark the block for retirement */
+ bi->needs_retiring = 1;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block));
+ }
+
+ /* Delete the chunk */
+ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+ yaffs_skip_rest_of_block(dev);
+}
+
/*
* Verification code
*/
return retval;
}
+
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
+{
+ int reserved_chunks;
+ int reserved_blocks = dev->param.n_reserved_blocks;
+ int checkpt_blocks;
+
+ checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
+
+ reserved_chunks =
+ ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block);
+
+ return (dev->n_free_chunks > (reserved_chunks + n_chunks));
+}
+
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
+{
+ int i;
+
+ struct yaffs_block_info *bi;
+
+ if (dev->n_erased_blocks < 1) {
+ /* Hoosterman we've got a problem.
+ * Can't get space to gc
+ */
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
+
+ return -1;
+ }
+
+ /* Find an empty block. */
+
+ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+ dev->alloc_block_finder++;
+ if (dev->alloc_block_finder < dev->internal_start_block
+ || dev->alloc_block_finder > dev->internal_end_block) {
+ dev->alloc_block_finder = dev->internal_start_block;
+ }
+
+ bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+ bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->seq_number++;
+ bi->seq_number = dev->seq_number;
+ dev->n_erased_blocks--;
+ T(YAFFS_TRACE_ALLOCATE,
+ (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
+ dev->alloc_block_finder, dev->seq_number,
+ dev->n_erased_blocks));
+ return dev->alloc_block_finder;
+ }
+ }
+
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("yaffs tragedy: no more erased blocks, but there should have been %d"
+ TENDSTR), dev->n_erased_blocks));
+
+ return -1;
+}
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+ struct yaffs_block_info **block_ptr)
+{
+ int ret_val;
+ struct yaffs_block_info *bi;
+
+ if (dev->alloc_block < 0) {
+ /* Get next block to allocate off */
+ dev->alloc_block = yaffs_find_alloc_block(dev);
+ dev->alloc_page = 0;
+ }
+
+ if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+ /* Not enough space to allocate unless we're allowed to use the reserve. */
+ return -1;
+ }
+
+ if (dev->n_erased_blocks < dev->param.n_reserved_blocks
+ && dev->alloc_page == 0) {
+ T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
+ }
+
+ /* Next page please.... */
+ if (dev->alloc_block >= 0) {
+ bi = yaffs_get_block_info(dev, dev->alloc_block);
+
+ ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
+ dev->alloc_page;
+ bi->pages_in_use++;
+ yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
+
+ dev->alloc_page++;
+
+ dev->n_free_chunks--;
+
+ /* If the block is full set the state to full */
+ if (dev->alloc_page >= dev->param.chunks_per_block) {
+ bi->block_state = YAFFS_BLOCK_STATE_FULL;
+ dev->alloc_block = -1;
+ }
+
+ if (block_ptr)
+ *block_ptr = bi;
+
+ return ret_val;
+ }
+
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+ return -1;
+}
+
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+{
+ int n;
+
+ n = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+ if (dev->alloc_block > 0)
+ n += (dev->param.chunks_per_block - dev->alloc_page);
+
+ return n;
+
+}
+
+/*
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
+{
+ if (dev->alloc_block > 0) {
+ struct yaffs_block_info *bi =
+ yaffs_get_block_info(dev, dev->alloc_block);
+ if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+ bi->block_state = YAFFS_BLOCK_STATE_FULL;
+ dev->alloc_block = -1;
+ }
+ }
+}
+
static int yaffs_write_new_chunk(struct yaffs_dev *dev,
const u8 * data,
struct yaffs_ext_tags *tags, int use_reserver)
dev->n_retired_blocks++;
}
-/*
- * Functions for robustisizing TODO
- *
- */
+/*---------------- Name handling functions ------------*/
-static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
- const u8 * data,
- const struct yaffs_ext_tags *tags)
+static u16 yaffs_calc_name_sum(const YCHAR * name)
{
- dev = dev;
- nand_chunk = nand_chunk;
- data = data;
- tags = tags;
-}
+ u16 sum = 0;
+ u16 i = 1;
-static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
- const struct yaffs_ext_tags *tags)
-{
- dev = dev;
- nand_chunk = nand_chunk;
- tags = tags;
-}
-
-void yaffs_handle_chunk_error(struct yaffs_dev *dev,
- struct yaffs_block_info *bi)
-{
- if (!bi->gc_prioritise) {
- bi->gc_prioritise = 1;
- dev->has_pending_prioritised_gc = 1;
- bi->chunk_error_strikes++;
-
- if (bi->chunk_error_strikes > 3) {
- bi->needs_retiring = 1; /* Too many stikes, so retire this */
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: Block struck out" TENDSTR)));
-
- }
- }
-}
-
-static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
- int erased_ok)
-{
- int flash_block = nand_chunk / dev->param.chunks_per_block;
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-
- yaffs_handle_chunk_error(dev, bi);
-
- if (erased_ok) {
- /* Was an actual write failure, so mark the block for retirement */
- bi->needs_retiring = 1;
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block));
- }
-
- /* Delete the chunk */
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- yaffs_skip_rest_of_block(dev);
-}
-
-/*---------------- Name handling functions ------------*/
-
-static u16 yaffs_calc_name_sum(const YCHAR * name)
-{
- u16 sum = 0;
- u16 i = 1;
-
- const YUCHAR *bname = (const YUCHAR *)name;
- if (bname) {
- while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) {
+ const YUCHAR *bname = (const YUCHAR *)name;
+ if (bname) {
+ while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) {
/* 0x1f mask is case insensitive */
sum += ((*bname) & 0x1f) * i;
#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
memset(obj->short_name, 0, sizeof(obj->short_name));
if (name &&
- yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
+ strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
YAFFS_SHORT_NAME_LENGTH)
- yaffs_strcpy(obj->short_name, name);
+ strcpy(obj->short_name, name);
else
obj->short_name[0] = _Y('\0');
#endif
return tn;
}
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
+ int chunk_obj)
+{
+ return (tags->chunk_id == chunk_obj &&
+ tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
+
+}
+
static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
struct yaffs_ext_tags *tags, int obj_id,
int inode_chunk)
return -1;
}
+static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+ struct yaffs_ext_tags *tags)
+{
+ /*Get the Tnode, then get the level 0 offset chunk offset */
+ struct yaffs_tnode *tn;
+ int the_chunk = -1;
+ struct yaffs_ext_tags local_tags;
+ int ret_val = -1;
+
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (!tags) {
+ /* Passed a NULL, so use our own tags space */
+ tags = &local_tags;
+ }
+
+ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+ if (tn) {
+ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ ret_val =
+ yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+ inode_chunk);
+ }
+ return ret_val;
+}
+
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+ struct yaffs_ext_tags *tags)
+{
+ /* Get the Tnode, then get the level 0 offset chunk offset */
+ struct yaffs_tnode *tn;
+ int the_chunk = -1;
+ struct yaffs_ext_tags local_tags;
+
+ struct yaffs_dev *dev = in->my_dev;
+ int ret_val = -1;
+
+ if (!tags) {
+ /* Passed a NULL, so use our own tags space */
+ tags = &local_tags;
+ }
+
+ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+ if (tn) {
+
+ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ ret_val =
+ yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+ inode_chunk);
+
+ /* Delete the entry in the filestructure (if found) */
+ if (ret_val != -1)
+ yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
+ }
+
+ return ret_val;
+}
+
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+ int nand_chunk, int in_scan)
+{
+ /* NB in_scan is zero unless scanning.
+ * For forward scanning, in_scan is > 0;
+ * for backward scanning in_scan is < 0
+ *
+ * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
+ */
+
+ struct yaffs_tnode *tn;
+ struct yaffs_dev *dev = in->my_dev;
+ int existing_cunk;
+ struct yaffs_ext_tags existing_tags;
+ struct yaffs_ext_tags new_tags;
+ unsigned existing_serial, new_serial;
+
+ if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
+ /* Just ignore an attempt at putting a chunk into a non-file during scanning
+ * If it is not during Scanning then something went wrong!
+ */
+ if (!in_scan) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy:attempt to put data chunk into a non-file"
+ TENDSTR)));
+ YBUG();
+ }
+
+ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+ return YAFFS_OK;
+ }
+
+ tn = yaffs_add_find_tnode_0(dev,
+ &in->variant.file_variant,
+ inode_chunk, NULL);
+ if (!tn)
+ return YAFFS_FAIL;
+
+ if (!nand_chunk)
+ /* Dummy insert, bail now */
+ return YAFFS_OK;
+
+ existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ if (in_scan != 0) {
+ /* If we're scanning then we need to test for duplicates
+ * NB This does not need to be efficient since it should only ever
+ * happen when the power fails during a write, then only one
+ * chunk should ever be affected.
+ *
+ * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+ * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+ */
+
+ if (existing_cunk > 0) {
+ /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
+ * thus we have to do a FindChunkInFile to get the real chunk id.
+ *
+ * We have a duplicate now we need to decide which one to use:
+ *
+ * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+ * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+ * YAFFS1: Get both sets of tags and compare serial numbers.
+ */
+
+ if (in_scan > 0) {
+ /* Only do this for forward scanning */
+ yaffs_rd_chunk_tags_nand(dev,
+ nand_chunk,
+ NULL, &new_tags);
+
+ /* Do a proper find */
+ existing_cunk =
+ yaffs_find_chunk_in_file(in, inode_chunk,
+ &existing_tags);
+ }
+
+ if (existing_cunk <= 0) {
+ /*Hoosterman - how did this happen? */
+
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: existing chunk < 0 in scan"
+ TENDSTR)));
+
+ }
+
+ /* NB The deleted flags should be false, otherwise the chunks will
+ * not be loaded during a scan
+ */
+
+ if (in_scan > 0) {
+ new_serial = new_tags.serial_number;
+ existing_serial = existing_tags.serial_number;
+ }
+
+ if ((in_scan > 0) &&
+ (existing_cunk <= 0 ||
+ ((existing_serial + 1) & 3) == new_serial)) {
+ /* Forward scanning.
+ * Use new
+ * Delete the old one and drop through to update the tnode
+ */
+ yaffs_chunk_del(dev, existing_cunk, 1,
+ __LINE__);
+ } else {
+ /* Backward scanning or we want to use the existing one
+ * Use existing.
+ * Delete the new one and return early so that the tnode isn't changed
+ */
+ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+ return YAFFS_OK;
+ }
+ }
+
+ }
+
+ if (existing_cunk == 0)
+ in->n_data_chunks++;
+
+ yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
+
+ return YAFFS_OK;
+}
+
static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
{
struct yaffs_block_info *the_block;
}
-static void yaffs_soft_del_file(struct yaffs_obj *obj)
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
{
- if (obj->deleted &&
- obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
- if (obj->n_data_chunks <= 0) {
- /* Empty file with no duplicate object headers, just delete it immediately */
- yaffs_free_tnode(obj->my_dev,
- obj->variant.file_variant.top);
- obj->variant.file_variant.top = NULL;
- T(YAFFS_TRACE_TRACING,
- (TSTR("yaffs: Deleting empty file %d" TENDSTR),
- obj->obj_id));
- yaffs_generic_obj_del(obj);
- } else {
- yaffs_soft_del_worker(obj,
- obj->variant.file_variant.top,
- obj->variant.
- file_variant.top_level, 0);
- obj->soft_del = 1;
- }
- }
-}
-
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- *
- * This function is recursive. For levels > 0 the function is called again on
- * any sub-tree. For level == 0 we just check if the sub-tree has data.
- * If there is no data in a subtree then it is pruned.
- */
-
-static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
- struct yaffs_tnode *tn, u32 level,
- int del0)
-{
- int i;
- int has_data;
-
- if (tn) {
- has_data = 0;
-
- if (level > 0) {
- for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i]) {
- tn->internal[i] =
- yaffs_prune_worker(dev,
- tn->internal[i],
- level - 1,
- (i ==
- 0) ? del0 : 1);
- }
-
- if (tn->internal[i])
- has_data++;
- }
- } else {
- int tnode_size_u32 = dev->tnode_size / sizeof(u32);
- u32 *map = (u32 *) tn;
-
- for (i = 0; !has_data && i < tnode_size_u32; i++) {
- if (map[i])
- has_data++;
- }
- }
+ struct yaffs_dev *dev = obj->my_dev;
+ struct yaffs_obj *parent;
- if (has_data == 0 && del0) {
- /* Free and return NULL */
+ yaffs_verify_obj_in_dir(obj);
+ parent = obj->parent;
- yaffs_free_tnode(dev, tn);
- tn = NULL;
- }
+ yaffs_verify_dir(parent);
- }
+ if (dev && dev->param.remove_obj_fn)
+ dev->param.remove_obj_fn(obj);
- return tn;
+ list_del_init(&obj->siblings);
+ obj->parent = NULL;
+ yaffs_verify_dir(parent);
}
-static int yaffs_prune_tree(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct)
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
{
- int i;
- int has_data;
- int done = 0;
- struct yaffs_tnode *tn;
+ if (!directory) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: Trying to add an object to a null pointer directory"
+ TENDSTR)));
+ YBUG();
+ return;
+ }
+ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: Trying to add an object to a non-directory"
+ TENDSTR)));
+ YBUG();
+ }
- if (file_struct->top_level > 0) {
- file_struct->top =
- yaffs_prune_worker(dev, file_struct->top,
- file_struct->top_level, 0);
+ if (obj->siblings.prev == NULL) {
+ /* Not initialised */
+ YBUG();
+ }
- /* Now we have a tree with all the non-zero branches NULL but the height
- * is the same as it was.
- * Let's see if we can trim internal tnodes to shorten the tree.
- * We can do this if only the 0th element in the tnode is in use
- * (ie all the non-zero are NULL)
- */
+ yaffs_verify_dir(directory);
- while (file_struct->top_level && !done) {
- tn = file_struct->top;
+ yaffs_remove_obj_from_dir(obj);
- has_data = 0;
- for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i])
- has_data++;
- }
+ /* Now add it */
+ list_add(&obj->siblings, &directory->variant.dir_variant.children);
+ obj->parent = directory;
- if (!has_data) {
- file_struct->top = tn->internal[0];
- file_struct->top_level--;
- yaffs_free_tnode(dev, tn);
- } else {
- done = 1;
- }
- }
+ if (directory == obj->my_dev->unlinked_dir
+ || directory == obj->my_dev->del_dir) {
+ obj->unlinked = 1;
+ obj->my_dev->n_unlinked_files++;
+ obj->rename_allowed = 0;
}
- return YAFFS_OK;
+ yaffs_verify_dir(directory);
+ yaffs_verify_obj_in_dir(obj);
}
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
-static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
+static int yaffs_change_obj_name(struct yaffs_obj *obj,
+ struct yaffs_obj *new_dir,
+ const YCHAR * new_name, int force, int shadows)
{
- struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
-
- if (obj) {
- dev->n_obj++;
+ int unlink_op;
+ int del_op;
- /* Now sweeten it up... */
+ struct yaffs_obj *existing_target;
- memset(obj, 0, sizeof(struct yaffs_obj));
- obj->being_created = 1;
+ if (new_dir == NULL)
+ new_dir = obj->parent; /* use the old directory */
- obj->my_dev = dev;
- obj->hdr_chunk = 0;
- obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
- INIT_LIST_HEAD(&(obj->hard_links));
- INIT_LIST_HEAD(&(obj->hash_link));
- INIT_LIST_HEAD(&obj->siblings);
+ if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: yaffs_change_obj_name: new_dir is not a directory"
+ TENDSTR)));
+ YBUG();
+ }
- /* Now make the directory sane */
- if (dev->root_dir) {
- obj->parent = dev->root_dir;
- list_add(&(obj->siblings),
- &dev->root_dir->variant.dir_variant.children);
- }
+ /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+ if (obj->my_dev->param.is_yaffs2)
+ unlink_op = (new_dir == obj->my_dev->unlinked_dir);
+ else
+ unlink_op = (new_dir == obj->my_dev->unlinked_dir
+ && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
- /* Add it to the lost and found directory.
- * NB Can't put root or lost-n-found in lost-n-found so
- * check if lost-n-found exists first
- */
- if (dev->lost_n_found)
- yaffs_add_obj_to_dir(dev->lost_n_found, obj);
+ del_op = (new_dir == obj->my_dev->del_dir);
- obj->being_created = 0;
- }
+ existing_target = yaffs_find_by_name(new_dir, new_name);
- dev->checkpoint_blocks_required = 0; /* force recalculation */
+ /* If the object is a file going into the unlinked directory,
+ * then it is OK to just stuff it in since duplicate names are allowed.
+ * else only proceed if the new name does not exist and if we're putting
+ * it into a directory.
+ */
+ if ((unlink_op ||
+ del_op ||
+ force ||
+ (shadows > 0) ||
+ !existing_target) &&
+ new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+ yaffs_set_obj_name(obj, new_name);
+ obj->dirty = 1;
- return obj;
-}
+ yaffs_add_obj_to_dir(new_dir, obj);
-static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
- int number, u32 mode)
-{
+ if (unlink_op)
+ obj->unlinked = 1;
- struct yaffs_obj *obj =
- yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
- if (obj) {
- obj->fake = 1; /* it is fake so it might have no NAND presence... */
- obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */
- obj->unlink_allowed = 0; /* ... or unlink it */
- obj->deleted = 0;
- obj->unlinked = 0;
- obj->yst_mode = mode;
- obj->my_dev = dev;
- obj->hdr_chunk = 0; /* Not a valid chunk. */
+ /* If it is a deletion then we mark it as a shrink for gc purposes. */
+ if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >=
+ 0)
+ return YAFFS_OK;
}
- return obj;
-
+ return YAFFS_FAIL;
}
-static void yaffs_unhash_obj(struct yaffs_obj *obj)
+/*------------------------ Short Operations Cache ----------------------------------------
+ * In many situations where there is no high level buffering a lot of
+ * reads might be short sequential reads, and a lot of writes may be short
+ * sequential writes. eg. scanning/writing a jpeg file.
+ * In these cases, a short read/write cache can provide a huge perfomance
+ * benefit with dumb-as-a-rock code.
+ * In Linux, the page cache provides read buffering and the short op cache
+ * provides write buffering.
+ *
+ * There are a limited number (~10) of cache chunks per device so that we don't
+ * need a very intelligent search.
+ */
+
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
{
- int bucket;
struct yaffs_dev *dev = obj->my_dev;
+ int i;
+ struct yaffs_cache *cache;
+ int n_caches = obj->my_dev->param.n_caches;
- /* If it is still linked into the bucket list, free from the list */
- if (!list_empty(&obj->hash_link)) {
- list_del_init(&obj->hash_link);
- bucket = yaffs_hash_fn(obj->obj_id);
- dev->obj_bucket[bucket].count--;
+ for (i = 0; i < n_caches; i++) {
+ cache = &dev->cache[i];
+ if (cache->object == obj && cache->dirty)
+ return 1;
}
+
+ return 0;
}
-/* FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_free_obj(struct yaffs_obj *obj)
+static void yaffs_flush_file_cache(struct yaffs_obj *obj)
{
struct yaffs_dev *dev = obj->my_dev;
+ int lowest = -99; /* Stop compiler whining. */
+ int i;
+ struct yaffs_cache *cache;
+ int chunk_written = 0;
+ int n_caches = obj->my_dev->param.n_caches;
- T(YAFFS_TRACE_OS,
- (TSTR("FreeObject %p inode %p" TENDSTR), obj, obj->my_inode));
+ if (n_caches > 0) {
+ do {
+ cache = NULL;
- if (!obj)
- YBUG();
- if (obj->parent)
- YBUG();
- if (!list_empty(&obj->siblings))
- YBUG();
+ /* Find the dirty cache for this object with the lowest chunk id. */
+ for (i = 0; i < n_caches; i++) {
+ if (dev->cache[i].object == obj &&
+ dev->cache[i].dirty) {
+ if (!cache
+ || dev->cache[i].chunk_id <
+ lowest) {
+ cache = &dev->cache[i];
+ lowest = cache->chunk_id;
+ }
+ }
+ }
- if (obj->my_inode) {
- /* We're still hooked up to a cached inode.
- * Don't delete now, but mark for later deletion
- */
- obj->defered_free = 1;
- return;
- }
+ if (cache && !cache->locked) {
+ /* Write it out and free it up */
- yaffs_unhash_obj(obj);
+ chunk_written =
+ yaffs_wr_data_obj(cache->object,
+ cache->chunk_id,
+ cache->data,
+ cache->n_bytes, 1);
+ cache->dirty = 0;
+ cache->object = NULL;
+ }
- yaffs_free_raw_obj(dev, obj);
- dev->n_obj--;
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-}
+ } while (cache && chunk_written > 0);
+
+ if (cache) {
+ /* Hoosterman, disk full while writing cache out. */
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: no space during cache write"
+ TENDSTR)));
+
+ }
+ }
-void yaffs_handle_defered_free(struct yaffs_obj *obj)
-{
- if (obj->defered_free)
- yaffs_free_obj(obj);
}
-static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
+/*yaffs_flush_whole_cache(dev)
+ *
+ *
+ */
+
+void yaffs_flush_whole_cache(struct yaffs_dev *dev)
{
+ struct yaffs_obj *obj;
+ int n_caches = dev->param.n_caches;
int i;
- dev->n_obj = 0;
- dev->n_tnodes = 0;
+ /* Find a dirty object in the cache and flush it...
+ * until there are no further dirty objects.
+ */
+ do {
+ obj = NULL;
+ for (i = 0; i < n_caches && !obj; i++) {
+ if (dev->cache[i].object && dev->cache[i].dirty)
+ obj = dev->cache[i].object;
- yaffs_init_raw_tnodes_and_objs(dev);
+ }
+ if (obj)
+ yaffs_flush_file_cache(obj);
+
+ } while (obj);
- for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
- INIT_LIST_HEAD(&dev->obj_bucket[i].list);
- dev->obj_bucket[i].count = 0;
- }
}
-static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
{
int i;
- int l = 999;
- int lowest = 999999;
-
- /* Search for the shortest list or one that
- * isn't too long.
- */
- for (i = 0; i < 10 && lowest > 4; i++) {
- dev->bucket_finder++;
- dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
- if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
- lowest = dev->obj_bucket[dev->bucket_finder].count;
- l = dev->bucket_finder;
+ if (dev->param.n_caches > 0) {
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (!dev->cache[i].object)
+ return &dev->cache[i];
}
-
}
- return l;
+ return NULL;
}
-static int yaffs_new_obj_id(struct yaffs_dev *dev)
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
{
- int bucket = yaffs_find_nice_bucket(dev);
+ struct yaffs_cache *cache;
+ struct yaffs_obj *the_obj;
+ int usage;
+ int i;
+ int pushout;
- /* Now find an object value that has not already been taken
- * by scanning the list.
- */
+ if (dev->param.n_caches > 0) {
+ /* Try find a non-dirty one... */
- int found = 0;
- struct list_head *i;
+ cache = yaffs_grab_chunk_worker(dev);
- u32 n = (u32) bucket;
+ if (!cache) {
+ /* They were all dirty, find the last recently used object and flush
+ * its cache, then find again.
+ * NB what's here is not very accurate, we actually flush the object
+ * the last recently used page.
+ */
- /* yaffs_check_obj_hash_sane(); */
+ /* With locking we can't assume we can use entry zero */
- while (!found) {
- found = 1;
- n += YAFFS_NOBJECT_BUCKETS;
- if (1 || dev->obj_bucket[bucket].count > 0) {
- list_for_each(i, &dev->obj_bucket[bucket].list) {
- /* If there is already one in the list */
- if (i && list_entry(i, struct yaffs_obj,
- hash_link)->obj_id == n) {
- found = 0;
+ the_obj = NULL;
+ usage = -1;
+ cache = NULL;
+ pushout = -1;
+
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].object &&
+ !dev->cache[i].locked &&
+ (dev->cache[i].last_use < usage
+ || !cache)) {
+ usage = dev->cache[i].last_use;
+ the_obj = dev->cache[i].object;
+ cache = &dev->cache[i];
+ pushout = i;
}
}
- }
- }
- return n;
-}
-
-static void yaffs_hash_obj(struct yaffs_obj *in)
-{
- int bucket = yaffs_hash_fn(in->obj_id);
- struct yaffs_dev *dev = in->my_dev;
+ if (!cache || cache->dirty) {
+ /* Flush and try again */
+ yaffs_flush_file_cache(the_obj);
+ cache = yaffs_grab_chunk_worker(dev);
+ }
- list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
- dev->obj_bucket[bucket].count++;
+ }
+ return cache;
+ } else {
+ return NULL;
+ }
}
-struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+ int chunk_id)
{
- int bucket = yaffs_hash_fn(number);
- struct list_head *i;
- struct yaffs_obj *in;
-
- list_for_each(i, &dev->obj_bucket[bucket].list) {
- /* Look if it is in the list */
- if (i) {
- in = list_entry(i, struct yaffs_obj, hash_link);
- if (in->obj_id == number) {
-
- /* Don't tell the VFS about this one if it is defered free */
- if (in->defered_free)
- return NULL;
+ struct yaffs_dev *dev = obj->my_dev;
+ int i;
+ if (dev->param.n_caches > 0) {
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].object == obj &&
+ dev->cache[i].chunk_id == chunk_id) {
+ dev->cache_hits++;
- return in;
+ return &dev->cache[i];
}
}
}
-
return NULL;
}
-struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
- enum yaffs_obj_type type)
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
+ int is_write)
{
- struct yaffs_obj *the_obj = NULL;
- struct yaffs_tnode *tn = NULL;
- if (number < 0)
- number = yaffs_new_obj_id(dev);
+ if (dev->param.n_caches > 0) {
+ if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
+ /* Reset the cache usages */
+ int i;
+ for (i = 1; i < dev->param.n_caches; i++)
+ dev->cache[i].last_use = 0;
- if (type == YAFFS_OBJECT_TYPE_FILE) {
- tn = yaffs_get_tnode(dev);
- if (!tn)
- return NULL;
- }
+ dev->cache_last_use = 0;
+ }
- the_obj = yaffs_alloc_empty_obj(dev);
- if (!the_obj) {
- if (tn)
- yaffs_free_tnode(dev, tn);
- return NULL;
- }
+ dev->cache_last_use++;
- if (the_obj) {
- the_obj->fake = 0;
- the_obj->rename_allowed = 1;
- the_obj->unlink_allowed = 1;
- the_obj->obj_id = number;
- yaffs_hash_obj(the_obj);
- the_obj->variant_type = type;
- yaffs_load_current_time(the_obj, 1, 1);
+ cache->last_use = dev->cache_last_use;
- switch (type) {
- case YAFFS_OBJECT_TYPE_FILE:
- the_obj->variant.file_variant.file_size = 0;
- the_obj->variant.file_variant.scanned_size = 0;
- the_obj->variant.file_variant.shrink_size = ~0; /* max */
- the_obj->variant.file_variant.top_level = 0;
- the_obj->variant.file_variant.top = tn;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
- INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* No action required */
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* todo this should not happen */
- break;
- }
+ if (is_write)
+ cache->dirty = 1;
}
-
- return the_obj;
}
-struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
- int number,
- enum yaffs_obj_type type)
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
{
- struct yaffs_obj *the_obj = NULL;
-
- if (number > 0)
- the_obj = yaffs_find_by_number(dev, number);
+ if (object->my_dev->param.n_caches > 0) {
+ struct yaffs_cache *cache =
+ yaffs_find_chunk_cache(object, chunk_id);
- if (!the_obj)
- the_obj = yaffs_new_obj(dev, number, type);
+ if (cache)
+ cache->object = NULL;
+ }
+}
- return the_obj;
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
+{
+ int i;
+ struct yaffs_dev *dev = in->my_dev;
+ if (dev->param.n_caches > 0) {
+ /* Invalidate it. */
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].object == in)
+ dev->cache[i].object = NULL;
+ }
+ }
}
-YCHAR *yaffs_clone_str(const YCHAR * str)
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
{
- YCHAR *new_str = NULL;
- int len;
-
- if (!str)
- str = _Y("");
+ int bucket;
+ struct yaffs_dev *dev = obj->my_dev;
- len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
- new_str = YMALLOC((len + 1) * sizeof(YCHAR));
- if (new_str) {
- yaffs_strncpy(new_str, str, len);
- new_str[len] = 0;
+ /* If it is still linked into the bucket list, free from the list */
+ if (!list_empty(&obj->hash_link)) {
+ list_del_init(&obj->hash_link);
+ bucket = yaffs_hash_fn(obj->obj_id);
+ dev->obj_bucket[bucket].count--;
}
- return new_str;
-
}
-/*
- * Mknod (create) a new object.
- * equiv_obj only has meaning for a hard link;
- * alias_str only has meaning for a symlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
- struct yaffs_obj *parent,
- const YCHAR * name,
- u32 mode,
- u32 uid,
- u32 gid,
- struct yaffs_obj *equiv_obj,
- const YCHAR * alias_str, u32 rdev)
+/* FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_free_obj(struct yaffs_obj *obj)
{
- struct yaffs_obj *in;
- YCHAR *str = NULL;
+ struct yaffs_dev *dev = obj->my_dev;
- struct yaffs_dev *dev = parent->my_dev;
+ T(YAFFS_TRACE_OS,
+ (TSTR("FreeObject %p inode %p" TENDSTR), obj, obj->my_inode));
- /* Check if the entry exists. If it does then fail the call since we don't want a dup. */
- if (yaffs_find_by_name(parent, name))
- return NULL;
+ if (!obj)
+ YBUG();
+ if (obj->parent)
+ YBUG();
+ if (!list_empty(&obj->siblings))
+ YBUG();
- if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
- str = yaffs_clone_str(alias_str);
- if (!str)
- return NULL;
+ if (obj->my_inode) {
+ /* We're still hooked up to a cached inode.
+ * Don't delete now, but mark for later deletion
+ */
+ obj->defered_free = 1;
+ return;
}
- in = yaffs_new_obj(dev, -1, type);
+ yaffs_unhash_obj(obj);
- if (!in) {
- if (str)
- YFREE(str);
- return NULL;
- }
+ yaffs_free_raw_obj(dev, obj);
+ dev->n_obj--;
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
+}
- if (in) {
- in->hdr_chunk = 0;
- in->valid = 1;
- in->variant_type = type;
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
+{
+ if (obj->defered_free)
+ yaffs_free_obj(obj);
+}
- in->yst_mode = mode;
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
+{
- yaffs_attribs_init(in, gid, uid, rdev);
+ /* First off, invalidate the file's data in the cache, without flushing. */
+ yaffs_invalidate_whole_cache(in);
- in->n_data_chunks = 0;
+ if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
+ /* Move to the unlinked directory so we have a record that it was deleted. */
+ yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
+ 0);
- yaffs_set_obj_name(in, name);
- in->dirty = 1;
+ }
- yaffs_add_obj_to_dir(parent, in);
+ yaffs_remove_obj_from_dir(in);
+ yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
+ in->hdr_chunk = 0;
- in->my_dev = parent->my_dev;
+ yaffs_free_obj(in);
+ return YAFFS_OK;
- switch (type) {
- case YAFFS_OBJECT_TYPE_SYMLINK:
- in->variant.symlink_variant.alias = str;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardlink_variant.equiv_obj = equiv_obj;
- in->variant.hardlink_variant.equiv_id =
- equiv_obj->obj_id;
- list_add(&in->hard_links, &equiv_obj->hard_links);
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- case YAFFS_OBJECT_TYPE_SPECIAL:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* do nothing */
- break;
- }
+}
- if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
- /* Could not create the object header, fail the creation */
- yaffs_del_obj(in);
- in = NULL;
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
+{
+ if (obj->deleted &&
+ obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
+ if (obj->n_data_chunks <= 0) {
+ /* Empty file with no duplicate object headers, just delete it immediately */
+ yaffs_free_tnode(obj->my_dev,
+ obj->variant.file_variant.top);
+ obj->variant.file_variant.top = NULL;
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+ obj->obj_id));
+ yaffs_generic_obj_del(obj);
+ } else {
+ yaffs_soft_del_worker(obj,
+ obj->variant.file_variant.top,
+ obj->variant.
+ file_variant.top_level, 0);
+ obj->soft_del = 1;
}
-
- yaffs_update_parent(parent);
}
-
- return in;
}
-struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
- const YCHAR * name, u32 mode, u32 uid,
- u32 gid)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
- uid, gid, NULL, NULL, 0);
-}
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
-struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
- u32 mode, u32 uid, u32 gid)
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+ struct yaffs_tnode *tn, u32 level,
+ int del0)
{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
- mode, uid, gid, NULL, NULL, 0);
-}
+ int i;
+ int has_data;
-struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
- const YCHAR * name, u32 mode, u32 uid,
- u32 gid, u32 rdev)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
- uid, gid, NULL, NULL, rdev);
-}
+ if (tn) {
+ has_data = 0;
-struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
- const YCHAR * name, u32 mode, u32 uid,
- u32 gid, const YCHAR * alias)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
- uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_link_obj returns the object id of the equivalent object.*/
-struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
- struct yaffs_obj *equiv_obj)
-{
- /* Get the real object in case we were fed a hard link as an equivalent object */
- equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
-
- if (yaffs_create_obj
- (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
- equiv_obj, NULL, 0)) {
- return equiv_obj;
- } else {
- return NULL;
- }
+ if (level > 0) {
+ for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+ if (tn->internal[i]) {
+ tn->internal[i] =
+ yaffs_prune_worker(dev,
+ tn->internal[i],
+ level - 1,
+ (i ==
+ 0) ? del0 : 1);
+ }
-}
+ if (tn->internal[i])
+ has_data++;
+ }
+ } else {
+ int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+ u32 *map = (u32 *) tn;
-static int yaffs_change_obj_name(struct yaffs_obj *obj,
- struct yaffs_obj *new_dir,
- const YCHAR * new_name, int force, int shadows)
-{
- int unlink_op;
- int del_op;
+ for (i = 0; !has_data && i < tnode_size_u32; i++) {
+ if (map[i])
+ has_data++;
+ }
+ }
- struct yaffs_obj *existing_target;
+ if (has_data == 0 && del0) {
+ /* Free and return NULL */
- if (new_dir == NULL)
- new_dir = obj->parent; /* use the old directory */
+ yaffs_free_tnode(dev, tn);
+ tn = NULL;
+ }
- if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: yaffs_change_obj_name: new_dir is not a directory"
- TENDSTR)));
- YBUG();
}
- /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
- if (obj->my_dev->param.is_yaffs2)
- unlink_op = (new_dir == obj->my_dev->unlinked_dir);
- else
- unlink_op = (new_dir == obj->my_dev->unlinked_dir
- && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
+ return tn;
- del_op = (new_dir == obj->my_dev->del_dir);
+}
- existing_target = yaffs_find_by_name(new_dir, new_name);
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+ struct yaffs_file_var *file_struct)
+{
+ int i;
+ int has_data;
+ int done = 0;
+ struct yaffs_tnode *tn;
- /* If the object is a file going into the unlinked directory,
- * then it is OK to just stuff it in since duplicate names are allowed.
- * else only proceed if the new name does not exist and if we're putting
- * it into a directory.
- */
- if ((unlink_op ||
- del_op ||
- force ||
- (shadows > 0) ||
- !existing_target) &&
- new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_set_obj_name(obj, new_name);
- obj->dirty = 1;
+ if (file_struct->top_level > 0) {
+ file_struct->top =
+ yaffs_prune_worker(dev, file_struct->top,
+ file_struct->top_level, 0);
- yaffs_add_obj_to_dir(new_dir, obj);
+ /* Now we have a tree with all the non-zero branches NULL but the height
+ * is the same as it was.
+ * Let's see if we can trim internal tnodes to shorten the tree.
+ * We can do this if only the 0th element in the tnode is in use
+ * (ie all the non-zero are NULL)
+ */
- if (unlink_op)
- obj->unlinked = 1;
+ while (file_struct->top_level && !done) {
+ tn = file_struct->top;
- /* If it is a deletion then we mark it as a shrink for gc purposes. */
- if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >=
- 0)
- return YAFFS_OK;
+ has_data = 0;
+ for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+ if (tn->internal[i])
+ has_data++;
+ }
+
+ if (!has_data) {
+ file_struct->top = tn->internal[0];
+ file_struct->top_level--;
+ yaffs_free_tnode(dev, tn);
+ } else {
+ done = 1;
+ }
+ }
}
- return YAFFS_FAIL;
+ return YAFFS_OK;
}
+/*-------------------- End of File Structure functions.-------------------*/
-/* Note:
- * If old_name is NULL then we take old_dir as the object to be renamed.
- */
-int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
- struct yaffs_obj *new_dir, const YCHAR * new_name)
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
{
- struct yaffs_obj *obj = NULL;
- struct yaffs_obj *existing_target = NULL;
- int force = 0;
- int result;
- struct yaffs_dev *dev;
+ struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
- if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- YBUG();
- if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- YBUG();
+ if (obj) {
+ dev->n_obj++;
- dev = old_dir->my_dev;
+ /* Now sweeten it up... */
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
- /* Special case for case insemsitive systems.
- * While look-up is case insensitive, the name isn't.
- * Therefore we might want to change x.txt to X.txt
- */
- if (old_dir == new_dir &&
- old_name && new_name &&
- yaffs_strcmp(old_name, new_name) == 0)
- force = 1;
-#endif
+ memset(obj, 0, sizeof(struct yaffs_obj));
+ obj->being_created = 1;
- if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
- YAFFS_MAX_NAME_LENGTH)
- /* ENAMETOOLONG */
- return YAFFS_FAIL;
+ obj->my_dev = dev;
+ obj->hdr_chunk = 0;
+ obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
+ INIT_LIST_HEAD(&(obj->hard_links));
+ INIT_LIST_HEAD(&(obj->hash_link));
+ INIT_LIST_HEAD(&obj->siblings);
- if(old_name)
- obj = yaffs_find_by_name(old_dir, old_name);
- else{
- obj = old_dir;
- old_dir = obj->parent;
- }
+ /* Now make the directory sane */
+ if (dev->root_dir) {
+ obj->parent = dev->root_dir;
+ list_add(&(obj->siblings),
+ &dev->root_dir->variant.dir_variant.children);
+ }
+ /* Add it to the lost and found directory.
+ * NB Can't put root or lost-n-found in lost-n-found so
+ * check if lost-n-found exists first
+ */
+ if (dev->lost_n_found)
+ yaffs_add_obj_to_dir(dev->lost_n_found, obj);
- if (obj && obj->rename_allowed) {
+ obj->being_created = 0;
+ }
- /* Now do the handling for an existing target, if there is one */
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
- existing_target = yaffs_find_by_name(new_dir, new_name);
- if (yaffs_is_non_empty_dir(existing_target)){
- return YAFFS_FAIL; /* ENOTEMPTY */
- } else if (existing_target && existing_target != obj) {
- /* Nuke the target first, using shadowing,
- * but only if it isn't the same object.
- *
- * Note we must disable gc otherwise it can mess up the shadowing.
- *
- */
- dev->gc_disable = 1;
- yaffs_change_obj_name(obj, new_dir, new_name, force,
- existing_target->obj_id);
- existing_target->is_shadowed = 1;
- yaffs_unlink_obj(existing_target);
- dev->gc_disable = 0;
- }
+ return obj;
+}
- result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
+{
+ int i;
+ int l = 999;
+ int lowest = 999999;
- yaffs_update_parent(old_dir);
- if (new_dir != old_dir)
- yaffs_update_parent(new_dir);
+ /* Search for the shortest list or one that
+ * isn't too long.
+ */
+
+ for (i = 0; i < 10 && lowest > 4; i++) {
+ dev->bucket_finder++;
+ dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
+ if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
+ lowest = dev->obj_bucket[dev->bucket_finder].count;
+ l = dev->bucket_finder;
+ }
- return result;
}
- return YAFFS_FAIL;
-}
-/*------------------------- Block Management and Page Allocation ----------------*/
+ return l;
+}
-static int yaffs_init_blocks(struct yaffs_dev *dev)
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
{
- int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+ int bucket = yaffs_find_nice_bucket(dev);
- dev->block_info = NULL;
- dev->chunk_bits = NULL;
+ /* Now find an object value that has not already been taken
+ * by scanning the list.
+ */
- dev->alloc_block = -1; /* force it to get a new one */
+ int found = 0;
+ struct list_head *i;
- /* If the first allocation strategy fails, thry the alternate one */
- dev->block_info = YMALLOC(n_blocks * sizeof(struct yaffs_block_info));
- if (!dev->block_info) {
- dev->block_info =
- YMALLOC_ALT(n_blocks * sizeof(struct yaffs_block_info));
- dev->block_info_alt = 1;
- } else {
- dev->block_info_alt = 0;
- }
+ u32 n = (u32) bucket;
- if (dev->block_info) {
- /* Set up dynamic blockinfo stuff. */
- dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; /* round up bytes */
- dev->chunk_bits = YMALLOC(dev->chunk_bit_stride * n_blocks);
- if (!dev->chunk_bits) {
- dev->chunk_bits =
- YMALLOC_ALT(dev->chunk_bit_stride * n_blocks);
- dev->chunk_bits_alt = 1;
- } else {
- dev->chunk_bits_alt = 0;
- }
- }
+ /* yaffs_check_obj_hash_sane(); */
- if (dev->block_info && dev->chunk_bits) {
- memset(dev->block_info, 0,
- n_blocks * sizeof(struct yaffs_block_info));
- memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
- return YAFFS_OK;
+ while (!found) {
+ found = 1;
+ n += YAFFS_NOBJECT_BUCKETS;
+ if (1 || dev->obj_bucket[bucket].count > 0) {
+ list_for_each(i, &dev->obj_bucket[bucket].list) {
+ /* If there is already one in the list */
+ if (i && list_entry(i, struct yaffs_obj,
+ hash_link)->obj_id == n) {
+ found = 0;
+ }
+ }
+ }
}
- return YAFFS_FAIL;
+ return n;
}
-static void yaffs_deinit_blocks(struct yaffs_dev *dev)
+static void yaffs_hash_obj(struct yaffs_obj *in)
{
- if (dev->block_info_alt && dev->block_info)
- YFREE_ALT(dev->block_info);
- else if (dev->block_info)
- YFREE(dev->block_info);
-
- dev->block_info_alt = 0;
-
- dev->block_info = NULL;
+ int bucket = yaffs_hash_fn(in->obj_id);
+ struct yaffs_dev *dev = in->my_dev;
- if (dev->chunk_bits_alt && dev->chunk_bits)
- YFREE_ALT(dev->chunk_bits);
- else if (dev->chunk_bits)
- YFREE(dev->chunk_bits);
- dev->chunk_bits_alt = 0;
- dev->chunk_bits = NULL;
+ list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+ dev->obj_bucket[bucket].count++;
}
-void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
{
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+ int bucket = yaffs_hash_fn(number);
+ struct list_head *i;
+ struct yaffs_obj *in;
- int erased_ok = 0;
+ list_for_each(i, &dev->obj_bucket[bucket].list) {
+ /* Look if it is in the list */
+ if (i) {
+ in = list_entry(i, struct yaffs_obj, hash_link);
+ if (in->obj_id == number) {
- /* If the block is still healthy erase it and mark as clean.
- * If the block has had a data failure, then retire it.
- */
+ /* Don't tell the VFS about this one if it is defered free */
+ if (in->defered_free)
+ return NULL;
- T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
- (TSTR("yaffs_block_became_dirty block %d state %d %s" TENDSTR),
- block_no, bi->block_state,
- (bi->needs_retiring) ? "needs retiring" : ""));
+ return in;
+ }
+ }
+ }
- yaffs2_clear_oldest_dirty_seq(dev, bi);
+ return NULL;
+}
- bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
+struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+ enum yaffs_obj_type type)
+{
+ struct yaffs_obj *the_obj = NULL;
+ struct yaffs_tnode *tn = NULL;
- /* If this is the block being garbage collected then stop gc'ing this block */
- if (block_no == dev->gc_block)
- dev->gc_block = 0;
+ if (number < 0)
+ number = yaffs_new_obj_id(dev);
- /* If this block is currently the best candidate for gc then drop as a candidate */
- if (block_no == dev->gc_dirtiest) {
- dev->gc_dirtiest = 0;
- dev->gc_pages_in_use = 0;
+ if (type == YAFFS_OBJECT_TYPE_FILE) {
+ tn = yaffs_get_tnode(dev);
+ if (!tn)
+ return NULL;
}
- if (!bi->needs_retiring) {
- yaffs2_checkpt_invalidate(dev);
- erased_ok = yaffs_erase_block(dev, block_no);
- if (!erased_ok) {
- dev->n_erase_failures++;
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("**>> Erasure failed %d" TENDSTR), block_no));
- }
+ the_obj = yaffs_alloc_empty_obj(dev);
+ if (!the_obj) {
+ if (tn)
+ yaffs_free_tnode(dev, tn);
+ return NULL;
}
- if (erased_ok &&
- ((yaffs_trace_mask & YAFFS_TRACE_ERASE)
- || !yaffs_skip_verification(dev))) {
- int i;
- for (i = 0; i < dev->param.chunks_per_block; i++) {
- if (!yaffs_check_chunk_erased
- (dev, block_no * dev->param.chunks_per_block + i)) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- (">>Block %d erasure supposedly OK, but chunk %d not erased"
- TENDSTR), block_no, i));
- }
+ if (the_obj) {
+ the_obj->fake = 0;
+ the_obj->rename_allowed = 1;
+ the_obj->unlink_allowed = 1;
+ the_obj->obj_id = number;
+ yaffs_hash_obj(the_obj);
+ the_obj->variant_type = type;
+ yaffs_load_current_time(the_obj, 1, 1);
+
+ switch (type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ the_obj->variant.file_variant.file_size = 0;
+ the_obj->variant.file_variant.scanned_size = 0;
+ the_obj->variant.file_variant.shrink_size = ~0; /* max */
+ the_obj->variant.file_variant.top_level = 0;
+ the_obj->variant.file_variant.top = tn;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
+ INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* No action required */
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* todo this should not happen */
+ break;
}
}
- if (erased_ok) {
- /* Clean it up... */
- bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
- bi->seq_number = 0;
- dev->n_erased_blocks++;
- bi->pages_in_use = 0;
- bi->soft_del_pages = 0;
- bi->has_shrink_hdr = 0;
- bi->skip_erased_check = 1; /* This is clean, so no need to check */
- bi->gc_prioritise = 0;
- yaffs_clear_chunk_bits(dev, block_no);
+ return the_obj;
+}
- T(YAFFS_TRACE_ERASE,
- (TSTR("Erased block %d" TENDSTR), block_no));
- } else {
- dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */
+static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
+ int number, u32 mode)
+{
- yaffs_retire_block(dev, block_no);
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("**>> Block %d retired" TENDSTR), block_no));
+ struct yaffs_obj *obj =
+ yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+ if (obj) {
+ obj->fake = 1; /* it is fake so it might have no NAND presence... */
+ obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */
+ obj->unlink_allowed = 0; /* ... or unlink it */
+ obj->deleted = 0;
+ obj->unlinked = 0;
+ obj->yst_mode = mode;
+ obj->my_dev = dev;
+ obj->hdr_chunk = 0; /* Not a valid chunk. */
}
+
+ return obj;
+
}
-static int yaffs_find_alloc_block(struct yaffs_dev *dev)
+
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
{
int i;
- struct yaffs_block_info *bi;
+ dev->n_obj = 0;
+ dev->n_tnodes = 0;
- if (dev->n_erased_blocks < 1) {
- /* Hoosterman we've got a problem.
- * Can't get space to gc
- */
- T(YAFFS_TRACE_ERROR,
- (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
+ yaffs_init_raw_tnodes_and_objs(dev);
- return -1;
+ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+ INIT_LIST_HEAD(&dev->obj_bucket[i].list);
+ dev->obj_bucket[i].count = 0;
}
+}
- /* Find an empty block. */
-
- for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- dev->alloc_block_finder++;
- if (dev->alloc_block_finder < dev->internal_start_block
- || dev->alloc_block_finder > dev->internal_end_block) {
- dev->alloc_block_finder = dev->internal_start_block;
- }
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+ int number,
+ enum yaffs_obj_type type)
+{
+ struct yaffs_obj *the_obj = NULL;
- bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+ if (number > 0)
+ the_obj = yaffs_find_by_number(dev, number);
- if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
- bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->seq_number++;
- bi->seq_number = dev->seq_number;
- dev->n_erased_blocks--;
- T(YAFFS_TRACE_ALLOCATE,
- (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
- dev->alloc_block_finder, dev->seq_number,
- dev->n_erased_blocks));
- return dev->alloc_block_finder;
- }
- }
+ if (!the_obj)
+ the_obj = yaffs_new_obj(dev, number, type);
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("yaffs tragedy: no more erased blocks, but there should have been %d"
- TENDSTR), dev->n_erased_blocks));
+ return the_obj;
- return -1;
}
-/*
- * Check if there's space to allocate...
- * Thinks.... do we need top make this ths same as yaffs_get_free_chunks()?
- */
-int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
+YCHAR *yaffs_clone_str(const YCHAR * str)
{
- int reserved_chunks;
- int reserved_blocks = dev->param.n_reserved_blocks;
- int checkpt_blocks;
+ YCHAR *new_str = NULL;
+ int len;
- checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
+ if (!str)
+ str = _Y("");
- reserved_chunks =
- ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block);
+ len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
+ new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
+ if (new_str) {
+ strncpy(new_str, str, len);
+ new_str[len] = 0;
+ }
+ return new_str;
- return (dev->n_free_chunks > (reserved_chunks + n_chunks));
}
+/*
+ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ * create dir/a : update dir's mtime/ctime
+ * rm dir/a: update dir's mtime/ctime
+ * modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_update_dirty_dirs must be
+ * called periodically.
+ */
-static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
- struct yaffs_block_info **block_ptr)
+static void yaffs_update_parent(struct yaffs_obj *obj)
{
- int ret_val;
- struct yaffs_block_info *bi;
-
- if (dev->alloc_block < 0) {
- /* Get next block to allocate off */
- dev->alloc_block = yaffs_find_alloc_block(dev);
- dev->alloc_page = 0;
- }
-
- if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
- /* Not enough space to allocate unless we're allowed to use the reserve. */
- return -1;
- }
-
- if (dev->n_erased_blocks < dev->param.n_reserved_blocks
- && dev->alloc_page == 0) {
- T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
- }
-
- /* Next page please.... */
- if (dev->alloc_block >= 0) {
- bi = yaffs_get_block_info(dev, dev->alloc_block);
-
- ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
- dev->alloc_page;
- bi->pages_in_use++;
- yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
-
- dev->alloc_page++;
-
- dev->n_free_chunks--;
+ struct yaffs_dev *dev;
+ if (!obj)
+ return;
+ dev = obj->my_dev;
+ obj->dirty = 1;
+ yaffs_load_current_time(obj, 0, 1);
+ if (dev->param.defered_dir_update) {
+ struct list_head *link = &obj->variant.dir_variant.dirty;
- /* If the block is full set the state to full */
- if (dev->alloc_page >= dev->param.chunks_per_block) {
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- dev->alloc_block = -1;
+ if (list_empty(link)) {
+ list_add(link, &dev->dirty_dirs);
+ T(YAFFS_TRACE_BACKGROUND,
+ (TSTR("Added object %d to dirty directories" TENDSTR),
+ obj->obj_id));
}
- if (block_ptr)
- *block_ptr = bi;
-
- return ret_val;
- }
-
- T(YAFFS_TRACE_ERROR,
- (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
-
- return -1;
+ } else {
+ yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+ }
}
-static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
{
- int n;
+ struct list_head *link;
+ struct yaffs_obj *obj;
+ struct yaffs_dir_var *d_s;
+ union yaffs_obj_var *o_v;
- n = dev->n_erased_blocks * dev->param.chunks_per_block;
+ T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
- if (dev->alloc_block > 0)
- n += (dev->param.chunks_per_block - dev->alloc_page);
+ while (!list_empty(&dev->dirty_dirs)) {
+ link = dev->dirty_dirs.next;
+ list_del_init(link);
- return n;
+ d_s = list_entry(link, struct yaffs_dir_var, dirty);
+ o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
+ obj = list_entry(o_v, struct yaffs_obj, variant);
+
+ T(YAFFS_TRACE_BACKGROUND,
+ (TSTR("Update directory %d" TENDSTR), obj->obj_id));
+ if (obj->dirty)
+ yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+ }
}
/*
- * yaffs_skip_rest_of_block() skips over the rest of the allocation block
- * if we don't want to write to it.
+ * Mknod (create) a new object.
+ * equiv_obj only has meaning for a hard link;
+ * alias_str only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
*/
-void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
-{
- if (dev->alloc_block > 0) {
- struct yaffs_block_info *bi =
- yaffs_get_block_info(dev, dev->alloc_block);
- if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- dev->alloc_block = -1;
- }
- }
-}
-static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
+static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
+ struct yaffs_obj *parent,
+ const YCHAR * name,
+ u32 mode,
+ u32 uid,
+ u32 gid,
+ struct yaffs_obj *equiv_obj,
+ const YCHAR * alias_str, u32 rdev)
{
- int old_chunk;
- int new_chunk;
- int mark_flash;
- int ret_val = YAFFS_OK;
- int i;
- int is_checkpt_block;
- int matching_chunk;
- int max_copies;
-
- int chunks_before = yaffs_get_erased_chunks(dev);
- int chunks_after;
-
- struct yaffs_ext_tags tags;
+ struct yaffs_obj *in;
+ YCHAR *str = NULL;
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
+ struct yaffs_dev *dev = parent->my_dev;
- struct yaffs_obj *object;
+ /* Check if the entry exists. If it does then fail the call since we don't want a dup. */
+ if (yaffs_find_by_name(parent, name))
+ return NULL;
- is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
+ if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ str = yaffs_clone_str(alias_str);
+ if (!str)
+ return NULL;
+ }
- T(YAFFS_TRACE_TRACING,
- (TSTR
- ("Collecting block %d, in use %d, shrink %d, whole_block %d"
- TENDSTR), block, bi->pages_in_use, bi->has_shrink_hdr,
- whole_block));
+ in = yaffs_new_obj(dev, -1, type);
- /*yaffs_verify_free_chunks(dev); */
+ if (!in) {
+ if (str)
+ kfree(str);
+ return NULL;
+ }
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
- bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
+ if (in) {
+ in->hdr_chunk = 0;
+ in->valid = 1;
+ in->variant_type = type;
- bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
+ in->yst_mode = mode;
- dev->gc_disable = 1;
+ yaffs_attribs_init(in, gid, uid, rdev);
- if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
- T(YAFFS_TRACE_TRACING,
- (TSTR
- ("Collecting block %d that has no chunks in use" TENDSTR),
- block));
- yaffs_block_became_dirty(dev, block);
- } else {
+ in->n_data_chunks = 0;
- u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+ yaffs_set_obj_name(in, name);
+ in->dirty = 1;
- yaffs_verify_blk(dev, bi, block);
+ yaffs_add_obj_to_dir(parent, in);
- max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
- old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
+ in->my_dev = parent->my_dev;
- for ( /* init already done */ ;
- ret_val == YAFFS_OK &&
- dev->gc_chunk < dev->param.chunks_per_block &&
- (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
- max_copies > 0; dev->gc_chunk++, old_chunk++) {
- if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+ switch (type) {
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symlink_variant.alias = str;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardlink_variant.equiv_obj = equiv_obj;
+ in->variant.hardlink_variant.equiv_id =
+ equiv_obj->obj_id;
+ list_add(&in->hard_links, &equiv_obj->hard_links);
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* do nothing */
+ break;
+ }
- /* This page is in use and might need to be copied off */
+ if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+ /* Could not create the object header, fail the creation */
+ yaffs_del_obj(in);
+ in = NULL;
+ }
- max_copies--;
+ yaffs_update_parent(parent);
+ }
- mark_flash = 1;
+ return in;
+}
- yaffs_init_tags(&tags);
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+ uid, gid, NULL, NULL, 0);
+}
- yaffs_rd_chunk_tags_nand(dev, old_chunk,
- buffer, &tags);
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
+ u32 mode, u32 uid, u32 gid)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+ mode, uid, gid, NULL, NULL, 0);
+}
- object = yaffs_find_by_number(dev, tags.obj_id);
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid, u32 rdev)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+ uid, gid, NULL, NULL, rdev);
+}
- T(YAFFS_TRACE_GC_DETAIL,
- (TSTR
- ("Collecting chunk in block %d, %d %d %d "
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid, const YCHAR * alias)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+ uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_link_obj returns the object id of the equivalent object.*/
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+ struct yaffs_obj *equiv_obj)
+{
+ /* Get the real object in case we were fed a hard link as an equivalent object */
+ equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
+
+ if (yaffs_create_obj
+ (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+ equiv_obj, NULL, 0)) {
+ return equiv_obj;
+ } else {
+ return NULL;
+ }
+
+}
+
+
+
+/*------------------------- Block Management and Page Allocation ----------------*/
+
+static int yaffs_init_blocks(struct yaffs_dev *dev)
+{
+ int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+ dev->block_info = NULL;
+ dev->chunk_bits = NULL;
+
+ dev->alloc_block = -1; /* force it to get a new one */
+
+ /* If the first allocation strategy fails, thry the alternate one */
+ dev->block_info =
+ kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
+ if (!dev->block_info) {
+ dev->block_info =
+ vmalloc(n_blocks * sizeof(struct yaffs_block_info));
+ dev->block_info_alt = 1;
+ } else {
+ dev->block_info_alt = 0;
+ }
+
+ if (dev->block_info) {
+ /* Set up dynamic blockinfo stuff. Round up bytes. */
+ dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
+ dev->chunk_bits =
+ kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
+ if (!dev->chunk_bits) {
+ dev->chunk_bits =
+ vmalloc(dev->chunk_bit_stride * n_blocks);
+ dev->chunk_bits_alt = 1;
+ } else {
+ dev->chunk_bits_alt = 0;
+ }
+ }
+
+ if (dev->block_info && dev->chunk_bits) {
+ memset(dev->block_info, 0,
+ n_blocks * sizeof(struct yaffs_block_info));
+ memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
+ return YAFFS_OK;
+ }
+
+ return YAFFS_FAIL;
+}
+
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
+{
+ if (dev->block_info_alt && dev->block_info)
+ vfree(dev->block_info);
+ else if (dev->block_info)
+ kfree(dev->block_info);
+
+ dev->block_info_alt = 0;
+
+ dev->block_info = NULL;
+
+ if (dev->chunk_bits_alt && dev->chunk_bits)
+ vfree(dev->chunk_bits);
+ else if (dev->chunk_bits)
+ kfree(dev->chunk_bits);
+ dev->chunk_bits_alt = 0;
+ dev->chunk_bits = NULL;
+}
+
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+{
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+
+ int erased_ok = 0;
+
+ /* If the block is still healthy erase it and mark as clean.
+ * If the block has had a data failure, then retire it.
+ */
+
+ T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+ (TSTR("yaffs_block_became_dirty block %d state %d %s" TENDSTR),
+ block_no, bi->block_state,
+ (bi->needs_retiring) ? "needs retiring" : ""));
+
+ yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+ bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
+
+ /* If this is the block being garbage collected then stop gc'ing this block */
+ if (block_no == dev->gc_block)
+ dev->gc_block = 0;
+
+ /* If this block is currently the best candidate for gc then drop as a candidate */
+ if (block_no == dev->gc_dirtiest) {
+ dev->gc_dirtiest = 0;
+ dev->gc_pages_in_use = 0;
+ }
+
+ if (!bi->needs_retiring) {
+ yaffs2_checkpt_invalidate(dev);
+ erased_ok = yaffs_erase_block(dev, block_no);
+ if (!erased_ok) {
+ dev->n_erase_failures++;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Erasure failed %d" TENDSTR), block_no));
+ }
+ }
+
+ if (erased_ok &&
+ ((yaffs_trace_mask & YAFFS_TRACE_ERASE)
+ || !yaffs_skip_verification(dev))) {
+ int i;
+ for (i = 0; i < dev->param.chunks_per_block; i++) {
+ if (!yaffs_check_chunk_erased
+ (dev, block_no * dev->param.chunks_per_block + i)) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ (">>Block %d erasure supposedly OK, but chunk %d not erased"
+ TENDSTR), block_no, i));
+ }
+ }
+ }
+
+ if (erased_ok) {
+ /* Clean it up... */
+ bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+ bi->seq_number = 0;
+ dev->n_erased_blocks++;
+ bi->pages_in_use = 0;
+ bi->soft_del_pages = 0;
+ bi->has_shrink_hdr = 0;
+ bi->skip_erased_check = 1; /* This is clean, so no need to check */
+ bi->gc_prioritise = 0;
+ yaffs_clear_chunk_bits(dev, block_no);
+
+ T(YAFFS_TRACE_ERASE,
+ (TSTR("Erased block %d" TENDSTR), block_no));
+ } else {
+ dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */
+
+ yaffs_retire_block(dev, block_no);
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Block %d retired" TENDSTR), block_no));
+ }
+}
+
+
+
+static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
+{
+ int old_chunk;
+ int new_chunk;
+ int mark_flash;
+ int ret_val = YAFFS_OK;
+ int i;
+ int is_checkpt_block;
+ int matching_chunk;
+ int max_copies;
+
+ int chunks_before = yaffs_get_erased_chunks(dev);
+ int chunks_after;
+
+ struct yaffs_ext_tags tags;
+
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
+
+ struct yaffs_obj *object;
+
+ is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
+
+ T(YAFFS_TRACE_TRACING,
+ (TSTR
+ ("Collecting block %d, in use %d, shrink %d, whole_block %d"
+ TENDSTR), block, bi->pages_in_use, bi->has_shrink_hdr,
+ whole_block));
+
+ /*yaffs_verify_free_chunks(dev); */
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
+ bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
+
+ bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
+
+ dev->gc_disable = 1;
+
+ if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
+ T(YAFFS_TRACE_TRACING,
+ (TSTR
+ ("Collecting block %d that has no chunks in use" TENDSTR),
+ block));
+ yaffs_block_became_dirty(dev, block);
+ } else {
+
+ u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+ yaffs_verify_blk(dev, bi, block);
+
+ max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
+ old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
+
+ for ( /* init already done */ ;
+ ret_val == YAFFS_OK &&
+ dev->gc_chunk < dev->param.chunks_per_block &&
+ (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
+ max_copies > 0; dev->gc_chunk++, old_chunk++) {
+ if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+
+ /* This page is in use and might need to be copied off */
+
+ max_copies--;
+
+ mark_flash = 1;
+
+ yaffs_init_tags(&tags);
+
+ yaffs_rd_chunk_tags_nand(dev, old_chunk,
+ buffer, &tags);
+
+ object = yaffs_find_by_number(dev, tags.obj_id);
+
+ T(YAFFS_TRACE_GC_DETAIL,
+ (TSTR
+ ("Collecting chunk in block %d, %d %d %d "
TENDSTR), dev->gc_chunk, tags.obj_id,
tags.chunk_id, tags.n_bytes));
return erased_chunks > dev->n_free_chunks / 2;
}
-/*------------------------- TAGS --------------------------------*/
+/*-------------------- Data file manipulation -----------------*/
-static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
- int chunk_obj)
+static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
{
- return (tags->chunk_id == chunk_obj &&
- tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
+ int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
-}
+ if (nand_chunk >= 0)
+ return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
+ buffer, NULL);
+ else {
+ T(YAFFS_TRACE_NANDACCESS,
+ (TSTR("Chunk %d not found zero instead" TENDSTR),
+ nand_chunk));
+ /* get sane (zero) data if you read a hole */
+ memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
+ return 0;
+ }
-/*-------------------- Data file manipulation -----------------*/
-
-static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags)
-{
- /*Get the Tnode, then get the level 0 offset chunk offset */
- struct yaffs_tnode *tn;
- int the_chunk = -1;
- struct yaffs_ext_tags local_tags;
- int ret_val = -1;
-
- struct yaffs_dev *dev = in->my_dev;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &local_tags;
- }
-
- tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
- if (tn) {
- the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- ret_val =
- yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
- inode_chunk);
- }
- return ret_val;
-}
-
-static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags)
-{
- /* Get the Tnode, then get the level 0 offset chunk offset */
- struct yaffs_tnode *tn;
- int the_chunk = -1;
- struct yaffs_ext_tags local_tags;
-
- struct yaffs_dev *dev = in->my_dev;
- int ret_val = -1;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &local_tags;
- }
-
- tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
- if (tn) {
-
- the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- ret_val =
- yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
- inode_chunk);
-
- /* Delete the entry in the filestructure (if found) */
- if (ret_val != -1)
- yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
- }
-
- return ret_val;
-}
-
-int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- int nand_chunk, int in_scan)
-{
- /* NB in_scan is zero unless scanning.
- * For forward scanning, in_scan is > 0;
- * for backward scanning in_scan is < 0
- *
- * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
- */
-
- struct yaffs_tnode *tn;
- struct yaffs_dev *dev = in->my_dev;
- int existing_cunk;
- struct yaffs_ext_tags existing_tags;
- struct yaffs_ext_tags new_tags;
- unsigned existing_serial, new_serial;
-
- if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
- /* Just ignore an attempt at putting a chunk into a non-file during scanning
- * If it is not during Scanning then something went wrong!
- */
- if (!in_scan) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy:attempt to put data chunk into a non-file"
- TENDSTR)));
- YBUG();
- }
-
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- return YAFFS_OK;
- }
-
- tn = yaffs_add_find_tnode_0(dev,
- &in->variant.file_variant,
- inode_chunk, NULL);
- if (!tn)
- return YAFFS_FAIL;
-
- if (!nand_chunk)
- /* Dummy insert, bail now */
- return YAFFS_OK;
-
- existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- if (in_scan != 0) {
- /* If we're scanning then we need to test for duplicates
- * NB This does not need to be efficient since it should only ever
- * happen when the power fails during a write, then only one
- * chunk should ever be affected.
- *
- * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
- * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
- */
-
- if (existing_cunk > 0) {
- /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
- * thus we have to do a FindChunkInFile to get the real chunk id.
- *
- * We have a duplicate now we need to decide which one to use:
- *
- * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
- * Forward scanning YAFFS2: The new one is what we use, dump the old one.
- * YAFFS1: Get both sets of tags and compare serial numbers.
- */
-
- if (in_scan > 0) {
- /* Only do this for forward scanning */
- yaffs_rd_chunk_tags_nand(dev,
- nand_chunk,
- NULL, &new_tags);
-
- /* Do a proper find */
- existing_cunk =
- yaffs_find_chunk_in_file(in, inode_chunk,
- &existing_tags);
- }
-
- if (existing_cunk <= 0) {
- /*Hoosterman - how did this happen? */
-
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy: existing chunk < 0 in scan"
- TENDSTR)));
-
- }
-
- /* NB The deleted flags should be false, otherwise the chunks will
- * not be loaded during a scan
- */
-
- if (in_scan > 0) {
- new_serial = new_tags.serial_number;
- existing_serial = existing_tags.serial_number;
- }
-
- if ((in_scan > 0) &&
- (existing_cunk <= 0 ||
- ((existing_serial + 1) & 3) == new_serial)) {
- /* Forward scanning.
- * Use new
- * Delete the old one and drop through to update the tnode
- */
- yaffs_chunk_del(dev, existing_cunk, 1,
- __LINE__);
- } else {
- /* Backward scanning or we want to use the existing one
- * Use existing.
- * Delete the new one and return early so that the tnode isn't changed
- */
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- return YAFFS_OK;
- }
- }
-
- }
-
- if (existing_cunk == 0)
- in->n_data_chunks++;
-
- yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
-
- return YAFFS_OK;
-}
-
-static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
-{
- int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
-
- if (nand_chunk >= 0)
- return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
- buffer, NULL);
- else {
- T(YAFFS_TRACE_NANDACCESS,
- (TSTR("Chunk %d not found zero instead" TENDSTR),
- nand_chunk));
- /* get sane (zero) data if you read a hole */
- memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
- return 0;
- }
-
-}
+}
void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
int lyn)
}
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force,
- int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
-{
-
- struct yaffs_block_info *bi;
- struct yaffs_dev *dev = in->my_dev;
- int prev_chunk_id;
- int ret_val = 0;
- int result = 0;
+static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
+ const YCHAR * name, const void *value, int size,
+ int flags)
+{
+ struct yaffs_xattr_mod xmod;
- int new_chunk_id;
- struct yaffs_ext_tags new_tags;
- struct yaffs_ext_tags old_tags;
- const YCHAR *alias = NULL;
+ int result;
- u8 *buffer = NULL;
- YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
+ xmod.set = set;
+ xmod.name = name;
+ xmod.data = value;
+ xmod.size = size;
+ xmod.flags = flags;
+ xmod.result = -ENOSPC;
- struct yaffs_obj_hdr *oh = NULL;
+ result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
- yaffs_strcpy(old_name, _Y("silly old name"));
+ if (result > 0)
+ return xmod.result;
+ else
+ return -ENOSPC;
+}
- if (!in->fake || in == dev->root_dir || /* The root_dir should also be saved */
- force || xmod) {
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+ struct yaffs_xattr_mod *xmod)
+{
+ int retval = 0;
+ int x_offs = sizeof(struct yaffs_obj_hdr);
+ struct yaffs_dev *dev = obj->my_dev;
+ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
- yaffs_check_gc(dev, 0);
- yaffs_check_obj_details_loaded(in);
+ char *x_buffer = buffer + x_offs;
- buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
- oh = (struct yaffs_obj_hdr *)buffer;
+ if (xmod->set)
+ retval =
+ nval_set(x_buffer, x_size, xmod->name, xmod->data,
+ xmod->size, xmod->flags);
+ else
+ retval = nval_del(x_buffer, x_size, xmod->name);
- prev_chunk_id = in->hdr_chunk;
+ obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+ obj->xattr_known = 1;
- if (prev_chunk_id > 0) {
- result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
- buffer, &old_tags);
+ xmod->result = retval;
- yaffs_verify_oh(in, oh, &old_tags, 0);
+ return retval;
+}
- memcpy(old_name, oh->name, sizeof(oh->name));
- memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr));
- } else {
- memset(buffer, 0xFF, dev->data_bytes_per_chunk);
- }
+static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name,
+ void *value, int size)
+{
+ char *buffer = NULL;
+ int result;
+ struct yaffs_ext_tags tags;
+ struct yaffs_dev *dev = obj->my_dev;
+ int x_offs = sizeof(struct yaffs_obj_hdr);
+ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
- oh->type = in->variant_type;
- oh->yst_mode = in->yst_mode;
- oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
+ char *x_buffer;
- yaffs_load_attribs_oh(oh, in);
+ int retval = 0;
- if (in->parent)
- oh->parent_obj_id = in->parent->obj_id;
+ if (obj->hdr_chunk < 1)
+ return -ENODATA;
+
+ /* If we know that the object has no xattribs then don't do all the
+ * reading and parsing.
+ */
+ if (obj->xattr_known && !obj->has_xattr) {
+ if (name)
+ return -ENODATA;
else
- oh->parent_obj_id = 0;
+ return 0;
+ }
- if (name && *name) {
- memset(oh->name, 0, sizeof(oh->name));
- yaffs_load_oh_from_name(dev, oh->name, name);
- } else if (prev_chunk_id > 0) {
- memcpy(oh->name, old_name, sizeof(oh->name));
- } else {
- memset(oh->name, 0, sizeof(oh->name));
- }
+ buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__);
+ if (!buffer)
+ return -ENOMEM;
- oh->is_shrink = is_shrink;
+ result =
+ yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
- switch (in->variant_type) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Should not happen */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- oh->file_size =
- (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
- || oh->parent_obj_id ==
- YAFFS_OBJECTID_UNLINKED) ? 0 : in->
- variant.file_variant.file_size;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- oh->equiv_id = in->variant.hardlink_variant.equiv_id;
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- alias = in->variant.symlink_variant.alias;
- if (!alias)
- alias = _Y("no alias");
- yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
- oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
- break;
+ if (result != YAFFS_OK)
+ retval = -ENOENT;
+ else {
+ x_buffer = buffer + x_offs;
+
+ if (!obj->xattr_known) {
+ obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+ obj->xattr_known = 1;
}
- /* process any xattrib modifications */
- if (xmod)
- yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
+ if (name)
+ retval = nval_get(x_buffer, x_size, name, value, size);
+ else
+ retval = nval_list(x_buffer, x_size, value, size);
+ }
+ yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__);
+ return retval;
+}
- /* Tags */
- yaffs_init_tags(&new_tags);
- in->serial++;
- new_tags.chunk_id = 0;
- new_tags.obj_id = in->obj_id;
- new_tags.serial_number = in->serial;
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+ const void *value, int size, int flags)
+{
+ return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
+}
- /* Add extra info for file header */
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
+{
+ return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
+}
- new_tags.extra_available = 1;
- new_tags.extra_parent_id = oh->parent_obj_id;
- new_tags.extra_length = oh->file_size;
- new_tags.extra_is_shrink = oh->is_shrink;
- new_tags.extra_equiv_id = oh->equiv_id;
- new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
- new_tags.extra_obj_type = in->variant_type;
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+ int size)
+{
+ return yaffs_do_xattrib_fetch(obj, name, value, size);
+}
- yaffs_verify_oh(in, oh, &new_tags, 1);
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
+{
+ return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
+}
- /* Create new chunk in NAND */
- new_chunk_id =
- yaffs_write_new_chunk(dev, buffer, &new_tags,
- (prev_chunk_id > 0) ? 1 : 0);
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
+{
+ u8 *chunk_data;
+ struct yaffs_obj_hdr *oh;
+ struct yaffs_dev *dev;
+ struct yaffs_ext_tags tags;
+ int result;
+ int alloc_failed = 0;
- if (new_chunk_id >= 0) {
+ if (!in)
+ return;
- in->hdr_chunk = new_chunk_id;
+ dev = in->my_dev;
- if (prev_chunk_id > 0) {
- yaffs_chunk_del(dev, prev_chunk_id, 1,
- __LINE__);
- }
+ if (in->lazy_loaded && in->hdr_chunk > 0) {
+ in->lazy_loaded = 0;
+ chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
- if (!yaffs_obj_cache_dirty(in))
- in->dirty = 0;
+ result =
+ yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data,
+ &tags);
+ oh = (struct yaffs_obj_hdr *)chunk_data;
- /* If this was a shrink, then mark the block that the chunk lives on */
- if (is_shrink) {
- bi = yaffs_get_block_info(in->my_dev,
- new_chunk_id /
- in->my_dev->param.
- chunks_per_block);
- bi->has_shrink_hdr = 1;
- }
+ in->yst_mode = oh->yst_mode;
+ yaffs_load_attribs(in, oh);
+ yaffs_set_obj_name_from_oh(in, oh);
+ if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ in->variant.symlink_variant.alias =
+ yaffs_clone_str(oh->alias);
+ if (!in->variant.symlink_variant.alias)
+ alloc_failed = 1; /* Not returned to caller */
}
- ret_val = new_chunk_id;
-
+ yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
}
-
- if (buffer)
- yaffs_release_temp_buffer(dev, buffer, __LINE__);
-
- return ret_val;
}
-/*------------------------ Short Operations Cache ----------------------------------------
- * In many situations where there is no high level buffering a lot of
- * reads might be short sequential reads, and a lot of writes may be short
- * sequential writes. eg. scanning/writing a jpeg file.
- * In these cases, a short read/write cache can provide a huge perfomance
- * benefit with dumb-as-a-rock code.
- * In Linux, the page cache provides read buffering and the short op cache
- * provides write buffering.
- *
- * There are a limited number (~10) of cache chunks per device so that we don't
- * need a very intelligent search.
- */
-
-static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
+ const YCHAR * oh_name, int buff_size)
{
- struct yaffs_dev *dev = obj->my_dev;
- int i;
- struct yaffs_cache *cache;
- int n_caches = obj->my_dev->param.n_caches;
-
- for (i = 0; i < n_caches; i++) {
- cache = &dev->cache[i];
- if (cache->object == obj && cache->dirty)
- return 1;
- }
-
- return 0;
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+ if (dev->param.auto_unicode) {
+ if (*oh_name) {
+ /* It is an ASCII name, so do an ASCII to unicode conversion */
+ const char *ascii_oh_name = (const char *)oh_name;
+ int n = buff_size - 1;
+ while (n > 0 && *ascii_oh_name) {
+ *name = *ascii_oh_name;
+ name++;
+ ascii_oh_name++;
+ n--;
+ }
+ } else {
+ strncpy(name, oh_name + 1, buff_size - 1);
+ }
+ } else {
+#else
+ {
+#endif
+ strncpy(name, oh_name, buff_size - 1);
+ }
}
-static void yaffs_flush_file_cache(struct yaffs_obj *obj)
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
+ const YCHAR * name)
{
- struct yaffs_dev *dev = obj->my_dev;
- int lowest = -99; /* Stop compiler whining. */
- int i;
- struct yaffs_cache *cache;
- int chunk_written = 0;
- int n_caches = obj->my_dev->param.n_caches;
-
- if (n_caches > 0) {
- do {
- cache = NULL;
-
- /* Find the dirty cache for this object with the lowest chunk id. */
- for (i = 0; i < n_caches; i++) {
- if (dev->cache[i].object == obj &&
- dev->cache[i].dirty) {
- if (!cache
- || dev->cache[i].chunk_id <
- lowest) {
- cache = &dev->cache[i];
- lowest = cache->chunk_id;
- }
- }
- }
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
- if (cache && !cache->locked) {
- /* Write it out and free it up */
+ int is_ascii;
+ YCHAR *w;
- chunk_written =
- yaffs_wr_data_obj(cache->object,
- cache->chunk_id,
- cache->data,
- cache->n_bytes, 1);
- cache->dirty = 0;
- cache->object = NULL;
- }
+ if (dev->param.auto_unicode) {
- } while (cache && chunk_written > 0);
+ is_ascii = 1;
+ w = name;
- if (cache) {
- /* Hoosterman, disk full while writing cache out. */
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy: no space during cache write"
- TENDSTR)));
+ /* Figure out if the name will fit in ascii character set */
+ while (is_ascii && *w) {
+ if ((*w) & 0xff00)
+ is_ascii = 0;
+ w++;
+ }
+ if (is_ascii) {
+ /* It is an ASCII name, so do a unicode to ascii conversion */
+ char *ascii_oh_name = (char *)oh_name;
+ int n = YAFFS_MAX_NAME_LENGTH - 1;
+ while (n > 0 && *name) {
+ *ascii_oh_name = *name;
+ name++;
+ ascii_oh_name++;
+ n--;
+ }
+ } else {
+ /* It is a unicode name, so save starting at the second YCHAR */
+ *oh_name = 0;
+ strncpy(oh_name + 1, name,
+ YAFFS_MAX_NAME_LENGTH - 2);
}
- }
+ } else {
+#else
+ {
+#endif
+ strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
+ }
}
-/*yaffs_flush_whole_cache(dev)
- *
- *
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
*/
-
-void yaffs_flush_whole_cache(struct yaffs_dev *dev)
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force,
+ int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
{
- struct yaffs_obj *obj;
- int n_caches = dev->param.n_caches;
- int i;
- /* Find a dirty object in the cache and flush it...
- * until there are no further dirty objects.
- */
- do {
- obj = NULL;
- for (i = 0; i < n_caches && !obj; i++) {
- if (dev->cache[i].object && dev->cache[i].dirty)
- obj = dev->cache[i].object;
+ struct yaffs_block_info *bi;
+
+ struct yaffs_dev *dev = in->my_dev;
+
+ int prev_chunk_id;
+ int ret_val = 0;
+ int result = 0;
+
+ int new_chunk_id;
+ struct yaffs_ext_tags new_tags;
+ struct yaffs_ext_tags old_tags;
+ const YCHAR *alias = NULL;
+
+ u8 *buffer = NULL;
+ YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
- }
- if (obj)
- yaffs_flush_file_cache(obj);
+ struct yaffs_obj_hdr *oh = NULL;
- } while (obj);
+ strcpy(old_name, _Y("silly old name"));
-}
+ if (!in->fake || in == dev->root_dir || /* The root_dir should also be saved */
+ force || xmod) {
-/* Grab us a cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
-{
- int i;
+ yaffs_check_gc(dev, 0);
+ yaffs_check_obj_details_loaded(in);
- if (dev->param.n_caches > 0) {
- for (i = 0; i < dev->param.n_caches; i++) {
- if (!dev->cache[i].object)
- return &dev->cache[i];
- }
- }
+ buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
+ oh = (struct yaffs_obj_hdr *)buffer;
- return NULL;
-}
+ prev_chunk_id = in->hdr_chunk;
-static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
-{
- struct yaffs_cache *cache;
- struct yaffs_obj *the_obj;
- int usage;
- int i;
- int pushout;
+ if (prev_chunk_id > 0) {
+ result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
+ buffer, &old_tags);
- if (dev->param.n_caches > 0) {
- /* Try find a non-dirty one... */
+ yaffs_verify_oh(in, oh, &old_tags, 0);
- cache = yaffs_grab_chunk_worker(dev);
+ memcpy(old_name, oh->name, sizeof(oh->name));
+ memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr));
+ } else {
+ memset(buffer, 0xFF, dev->data_bytes_per_chunk);
+ }
- if (!cache) {
- /* They were all dirty, find the last recently used object and flush
- * its cache, then find again.
- * NB what's here is not very accurate, we actually flush the object
- * the last recently used page.
- */
+ oh->type = in->variant_type;
+ oh->yst_mode = in->yst_mode;
+ oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
- /* With locking we can't assume we can use entry zero */
+ yaffs_load_attribs_oh(oh, in);
- the_obj = NULL;
- usage = -1;
- cache = NULL;
- pushout = -1;
+ if (in->parent)
+ oh->parent_obj_id = in->parent->obj_id;
+ else
+ oh->parent_obj_id = 0;
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object &&
- !dev->cache[i].locked &&
- (dev->cache[i].last_use < usage
- || !cache)) {
- usage = dev->cache[i].last_use;
- the_obj = dev->cache[i].object;
- cache = &dev->cache[i];
- pushout = i;
- }
- }
+ if (name && *name) {
+ memset(oh->name, 0, sizeof(oh->name));
+ yaffs_load_oh_from_name(dev, oh->name, name);
+ } else if (prev_chunk_id > 0) {
+ memcpy(oh->name, old_name, sizeof(oh->name));
+ } else {
+ memset(oh->name, 0, sizeof(oh->name));
+ }
- if (!cache || cache->dirty) {
- /* Flush and try again */
- yaffs_flush_file_cache(the_obj);
- cache = yaffs_grab_chunk_worker(dev);
- }
+ oh->is_shrink = is_shrink;
+ switch (in->variant_type) {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* Should not happen */
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ oh->file_size =
+ (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
+ || oh->parent_obj_id ==
+ YAFFS_OBJECTID_UNLINKED) ? 0 : in->
+ variant.file_variant.file_size;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ oh->equiv_id = in->variant.hardlink_variant.equiv_id;
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ alias = in->variant.symlink_variant.alias;
+ if (!alias)
+ alias = _Y("no alias");
+ strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
+ oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+ break;
}
- return cache;
- } else {
- return NULL;
- }
-}
-/* Find a cached chunk */
-static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
- int chunk_id)
-{
- struct yaffs_dev *dev = obj->my_dev;
- int i;
- if (dev->param.n_caches > 0) {
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object == obj &&
- dev->cache[i].chunk_id == chunk_id) {
- dev->cache_hits++;
+ /* process any xattrib modifications */
+ if (xmod)
+ yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
- return &dev->cache[i];
- }
- }
- }
- return NULL;
-}
+ /* Tags */
+ yaffs_init_tags(&new_tags);
+ in->serial++;
+ new_tags.chunk_id = 0;
+ new_tags.obj_id = in->obj_id;
+ new_tags.serial_number = in->serial;
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
- int is_write)
-{
+ /* Add extra info for file header */
- if (dev->param.n_caches > 0) {
- if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
- /* Reset the cache usages */
- int i;
- for (i = 1; i < dev->param.n_caches; i++)
- dev->cache[i].last_use = 0;
+ new_tags.extra_available = 1;
+ new_tags.extra_parent_id = oh->parent_obj_id;
+ new_tags.extra_length = oh->file_size;
+ new_tags.extra_is_shrink = oh->is_shrink;
+ new_tags.extra_equiv_id = oh->equiv_id;
+ new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
+ new_tags.extra_obj_type = in->variant_type;
- dev->cache_last_use = 0;
- }
+ yaffs_verify_oh(in, oh, &new_tags, 1);
- dev->cache_last_use++;
+ /* Create new chunk in NAND */
+ new_chunk_id =
+ yaffs_write_new_chunk(dev, buffer, &new_tags,
+ (prev_chunk_id > 0) ? 1 : 0);
- cache->last_use = dev->cache_last_use;
+ if (new_chunk_id >= 0) {
- if (is_write)
- cache->dirty = 1;
- }
-}
+ in->hdr_chunk = new_chunk_id;
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
-{
- if (object->my_dev->param.n_caches > 0) {
- struct yaffs_cache *cache =
- yaffs_find_chunk_cache(object, chunk_id);
+ if (prev_chunk_id > 0) {
+ yaffs_chunk_del(dev, prev_chunk_id, 1,
+ __LINE__);
+ }
- if (cache)
- cache->object = NULL;
- }
-}
+ if (!yaffs_obj_cache_dirty(in))
+ in->dirty = 0;
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
-{
- int i;
- struct yaffs_dev *dev = in->my_dev;
+ /* If this was a shrink, then mark the block that the chunk lives on */
+ if (is_shrink) {
+ bi = yaffs_get_block_info(in->my_dev,
+ new_chunk_id /
+ in->my_dev->param.
+ chunks_per_block);
+ bi->has_shrink_hdr = 1;
+ }
- if (dev->param.n_caches > 0) {
- /* Invalidate it. */
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object == in)
- dev->cache[i].object = NULL;
}
+
+ ret_val = new_chunk_id;
+
}
+
+ if (buffer)
+ yaffs_release_temp_buffer(dev, buffer, __LINE__);
+
+ return ret_val;
}
/*--------------------- File read/write ------------------------
if (in->dirty) {
yaffs_flush_file_cache(in);
if (data_sync) /* Only sync data */
- ret_val = YAFFS_OK;
- else {
- if (update_time)
- yaffs_load_current_time(in, 0, 0);
-
- ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
- 0) ? YAFFS_OK : YAFFS_FAIL;
- }
- } else {
- ret_val = YAFFS_OK;
- }
-
- return ret_val;
-
-}
-
-static int yaffs_generic_obj_del(struct yaffs_obj *in)
-{
-
- /* First off, invalidate the file's data in the cache, without flushing. */
- yaffs_invalidate_whole_cache(in);
-
- if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
- /* Move to the unlinked directory so we have a record that it was deleted. */
- yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
- 0);
+ ret_val = YAFFS_OK;
+ else {
+ if (update_time)
+ yaffs_load_current_time(in, 0, 0);
+ ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
+ 0) ? YAFFS_OK : YAFFS_FAIL;
+ }
+ } else {
+ ret_val = YAFFS_OK;
}
- yaffs_remove_obj_from_dir(in);
- yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
- in->hdr_chunk = 0;
-
- yaffs_free_obj(in);
- return YAFFS_OK;
+ return ret_val;
}
+
/* yaffs_del_file deletes the whole file data
* and the inode associated with the file.
* It does not delete the links associated with the file.
static int yaffs_del_symlink(struct yaffs_obj *in)
{
if (in->variant.symlink_variant.alias)
- YFREE(in->variant.symlink_variant.alias);
+ kfree(in->variant.symlink_variant.alias);
in->variant.symlink_variant.alias = NULL;
return yaffs_generic_obj_del(in);
return yaffs_unlink_obj(obj);
}
+/* Note:
+ * If old_name is NULL then we take old_dir as the object to be renamed.
+ */
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+ struct yaffs_obj *new_dir, const YCHAR * new_name)
+{
+ struct yaffs_obj *obj = NULL;
+ struct yaffs_obj *existing_target = NULL;
+ int force = 0;
+ int result;
+ struct yaffs_dev *dev;
+
+ if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ YBUG();
+ if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ YBUG();
+
+ dev = old_dir->my_dev;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ /* Special case for case insemsitive systems.
+ * While look-up is case insensitive, the name isn't.
+ * Therefore we might want to change x.txt to X.txt
+ */
+ if (old_dir == new_dir &&
+ old_name && new_name &&
+ strcmp(old_name, new_name) == 0)
+ force = 1;
+#endif
+
+ if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
+ YAFFS_MAX_NAME_LENGTH)
+ /* ENAMETOOLONG */
+ return YAFFS_FAIL;
+
+ if(old_name)
+ obj = yaffs_find_by_name(old_dir, old_name);
+ else{
+ obj = old_dir;
+ old_dir = obj->parent;
+ }
+
+
+ if (obj && obj->rename_allowed) {
+
+ /* Now do the handling for an existing target, if there is one */
+
+ existing_target = yaffs_find_by_name(new_dir, new_name);
+ if (yaffs_is_non_empty_dir(existing_target)){
+ return YAFFS_FAIL; /* ENOTEMPTY */
+ } else if (existing_target && existing_target != obj) {
+ /* Nuke the target first, using shadowing,
+ * but only if it isn't the same object.
+ *
+ * Note we must disable gc otherwise it can mess up the shadowing.
+ *
+ */
+ dev->gc_disable = 1;
+ yaffs_change_obj_name(obj, new_dir, new_name, force,
+ existing_target->obj_id);
+ existing_target->is_shadowed = 1;
+ yaffs_unlink_obj(existing_target);
+ dev->gc_disable = 0;
+ }
+
+ result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
+
+ yaffs_update_parent(old_dir);
+ if (new_dir != old_dir)
+ yaffs_update_parent(new_dir);
+
+ return result;
+ }
+ return YAFFS_FAIL;
+}
+
/*----------------------- Initialisation Scanning ---------------------- */
void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
T(YAFFS_TRACE_SCAN,
(TSTR
("Hanging object %d moved to lost and found"
- TENDSTR), obj->obj_id));
- yaffs_add_obj_to_dir(dev->lost_n_found,
- obj);
- }
- }
- }
- }
-}
-
-/*
- * Delete directory contents for cleaning up lost and found.
- */
-static void yaffs_del_dir_contents(struct yaffs_obj *dir)
-{
- struct yaffs_obj *obj;
- struct list_head *lh;
- struct list_head *n;
-
- if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- YBUG();
-
- list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
- if (lh) {
- obj = list_entry(lh, struct yaffs_obj, siblings);
- if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
- yaffs_del_dir_contents(obj);
-
- T(YAFFS_TRACE_SCAN,
- (TSTR("Deleting lost_found object %d" TENDSTR),
- obj->obj_id));
-
- /* Need to use UnlinkObject since Delete would not handle
- * hardlinked objects correctly.
- */
- yaffs_unlink_obj(obj);
- }
- }
-
-}
-
-static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
-{
- yaffs_del_dir_contents(dev->lost_n_found);
-}
-
-static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
-{
- u8 *chunk_data;
- struct yaffs_obj_hdr *oh;
- struct yaffs_dev *dev;
- struct yaffs_ext_tags tags;
- int result;
- int alloc_failed = 0;
-
- if (!in)
- return;
-
- dev = in->my_dev;
-
- if (in->lazy_loaded && in->hdr_chunk > 0) {
- in->lazy_loaded = 0;
- chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
-
- result =
- yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data,
- &tags);
- oh = (struct yaffs_obj_hdr *)chunk_data;
-
- in->yst_mode = oh->yst_mode;
- yaffs_load_attribs(in, oh);
- yaffs_set_obj_name_from_oh(in, oh);
-
- if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
- in->variant.symlink_variant.alias =
- yaffs_clone_str(oh->alias);
- if (!in->variant.symlink_variant.alias)
- alloc_failed = 1; /* Not returned to caller */
- }
-
- yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
- }
-}
-
-/*------------------------------ Directory Functions ----------------------------- */
-
-/*
- *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
- * link (ie. name) is created or deleted in the directory.
- *
- * ie.
- * create dir/a : update dir's mtime/ctime
- * rm dir/a: update dir's mtime/ctime
- * modify dir/a: don't update dir's mtimme/ctime
- *
- * This can be handled immediately or defered. Defering helps reduce the number
- * of updates when many files in a directory are changed within a brief period.
- *
- * If the directory updating is defered then yaffs_update_dirty_dirs must be
- * called periodically.
- */
-
-static void yaffs_update_parent(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev;
- if (!obj)
- return;
- dev = obj->my_dev;
- obj->dirty = 1;
- yaffs_load_current_time(obj, 0, 1);
- if (dev->param.defered_dir_update) {
- struct list_head *link = &obj->variant.dir_variant.dirty;
-
- if (list_empty(link)) {
- list_add(link, &dev->dirty_dirs);
- T(YAFFS_TRACE_BACKGROUND,
- (TSTR("Added object %d to dirty directories" TENDSTR),
- obj->obj_id));
- }
-
- } else {
- yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
- }
-}
-
-void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
-{
- struct list_head *link;
- struct yaffs_obj *obj;
- struct yaffs_dir_var *d_s;
- union yaffs_obj_var *o_v;
-
- T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
-
- while (!list_empty(&dev->dirty_dirs)) {
- link = dev->dirty_dirs.next;
- list_del_init(link);
-
- d_s = list_entry(link, struct yaffs_dir_var, dirty);
- o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
- obj = list_entry(o_v, struct yaffs_obj, variant);
-
- T(YAFFS_TRACE_BACKGROUND,
- (TSTR("Update directory %d" TENDSTR), obj->obj_id));
-
- if (obj->dirty)
- yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
- }
-}
-
-static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev = obj->my_dev;
- struct yaffs_obj *parent;
-
- yaffs_verify_obj_in_dir(obj);
- parent = obj->parent;
-
- yaffs_verify_dir(parent);
-
- if (dev && dev->param.remove_obj_fn)
- dev->param.remove_obj_fn(obj);
-
- list_del_init(&obj->siblings);
- obj->parent = NULL;
-
- yaffs_verify_dir(parent);
+ TENDSTR), obj->obj_id));
+ yaffs_add_obj_to_dir(dev->lost_n_found,
+ obj);
+ }
+ }
+ }
+ }
}
-void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_del_dir_contents(struct yaffs_obj *dir)
{
- if (!directory) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: Trying to add an object to a null pointer directory"
- TENDSTR)));
- YBUG();
- return;
- }
- if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: Trying to add an object to a non-directory"
- TENDSTR)));
- YBUG();
- }
+ struct yaffs_obj *obj;
+ struct list_head *lh;
+ struct list_head *n;
- if (obj->siblings.prev == NULL) {
- /* Not initialised */
+ if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
YBUG();
- }
-
- yaffs_verify_dir(directory);
- yaffs_remove_obj_from_dir(obj);
+ list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
+ if (lh) {
+ obj = list_entry(lh, struct yaffs_obj, siblings);
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+ yaffs_del_dir_contents(obj);
- /* Now add it */
- list_add(&obj->siblings, &directory->variant.dir_variant.children);
- obj->parent = directory;
+ T(YAFFS_TRACE_SCAN,
+ (TSTR("Deleting lost_found object %d" TENDSTR),
+ obj->obj_id));
- if (directory == obj->my_dev->unlinked_dir
- || directory == obj->my_dev->del_dir) {
- obj->unlinked = 1;
- obj->my_dev->n_unlinked_files++;
- obj->rename_allowed = 0;
+ /* Need to use UnlinkObject since Delete would not handle
+ * hardlinked objects correctly.
+ */
+ yaffs_unlink_obj(obj);
+ }
}
- yaffs_verify_dir(directory);
- yaffs_verify_obj_in_dir(obj);
}
+static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
+{
+ yaffs_del_dir_contents(dev->lost_n_found);
+}
+
+
struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
const YCHAR * name)
{
/* Special case for lost-n-found */
if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
- if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
+ if (!strcmp(name, YAFFS_LOSTNFOUND_NAME))
return l;
- } else if (yaffs_sum_cmp(l->sum, sum)
+ } else if (l->sum == sum
|| l->hdr_chunk <= 0) {
/* LostnFound chunk called Objxxx
* Do a real check
*/
yaffs_get_obj_name(l, buffer,
YAFFS_MAX_NAME_LENGTH + 1);
- if (yaffs_strncmp
+ if (strncmp
(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
return l;
}
int buffer_size)
{
/* Create an object name if we could not find one. */
- if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
+ if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
YCHAR local_name[20];
YCHAR num_string[20];
YCHAR *x = &num_string[19];
v /= 10;
}
/* make up a name */
- yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
- yaffs_strcat(local_name, x);
- yaffs_strncpy(name, local_name, buffer_size - 1);
+ strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
+ strcat(local_name, x);
+ strncpy(name, local_name, buffer_size - 1);
}
}
-static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
- const YCHAR * oh_name, int buff_size)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
- if (dev->param.auto_unicode) {
- if (*oh_name) {
- /* It is an ASCII name, so do an ASCII to unicode conversion */
- const char *ascii_oh_name = (const char *)oh_name;
- int n = buff_size - 1;
- while (n > 0 && *ascii_oh_name) {
- *name = *ascii_oh_name;
- name++;
- ascii_oh_name++;
- n--;
- }
- } else {
- yaffs_strncpy(name, oh_name + 1, buff_size - 1);
- }
- } else {
-#else
- {
-#endif
- yaffs_strncpy(name, oh_name, buff_size - 1);
- }
-}
-
-static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
- const YCHAR * name)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
-
- int is_ascii;
- YCHAR *w;
-
- if (dev->param.auto_unicode) {
-
- is_ascii = 1;
- w = name;
-
- /* Figure out if the name will fit in ascii character set */
- while (is_ascii && *w) {
- if ((*w) & 0xff00)
- is_ascii = 0;
- w++;
- }
-
- if (is_ascii) {
- /* It is an ASCII name, so do a unicode to ascii conversion */
- char *ascii_oh_name = (char *)oh_name;
- int n = YAFFS_MAX_NAME_LENGTH - 1;
- while (n > 0 && *name) {
- *ascii_oh_name = *name;
- name++;
- ascii_oh_name++;
- n--;
- }
- } else {
- /* It is a unicode name, so save starting at the second YCHAR */
- *oh_name = 0;
- yaffs_strncpy(oh_name + 1, name,
- YAFFS_MAX_NAME_LENGTH - 2);
- }
- } else {
-#else
- {
-#endif
- yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
- }
-
-}
-
int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size)
{
memset(name, 0, buffer_size * sizeof(YCHAR));
yaffs_check_obj_details_loaded(obj);
if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
- yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
+ strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
}
#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
else if (obj->short_name[0]) {
- yaffs_strcpy(name, obj->short_name);
+ strcpy(name, obj->short_name);
}
#endif
else if (obj->hdr_chunk > 0) {
yaffs_fix_null_name(obj, name, buffer_size);
- return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
+ return strnlen(name, YAFFS_MAX_NAME_LENGTH);
}
int yaffs_get_obj_length(struct yaffs_obj *obj)
if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
if (!obj->variant.symlink_variant.alias)
return 0;
- return yaffs_strnlen(obj->variant.symlink_variant.alias,
+ return strnlen(obj->variant.symlink_variant.alias,
YAFFS_MAX_ALIAS_LENGTH);
} else {
/* Only a directory should drop through to here */
return yaffs_clone_str(_Y(""));
}
-static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
- const YCHAR * name, const void *value, int size,
- int flags)
-{
- struct yaffs_xattr_mod xmod;
-
- int result;
-
- xmod.set = set;
- xmod.name = name;
- xmod.data = value;
- xmod.size = size;
- xmod.flags = flags;
- xmod.result = -ENOSPC;
-
- result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
-
- if (result > 0)
- return xmod.result;
- else
- return -ENOSPC;
-}
-
-static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
- struct yaffs_xattr_mod *xmod)
-{
- int retval = 0;
- int x_offs = sizeof(struct yaffs_obj_hdr);
- struct yaffs_dev *dev = obj->my_dev;
- int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
-
- char *x_buffer = buffer + x_offs;
-
- if (xmod->set)
- retval =
- nval_set(x_buffer, x_size, xmod->name, xmod->data,
- xmod->size, xmod->flags);
- else
- retval = nval_del(x_buffer, x_size, xmod->name);
-
- obj->has_xattr = nval_hasvalues(x_buffer, x_size);
- obj->xattr_known = 1;
-
- xmod->result = retval;
-
- return retval;
-}
-
-static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name,
- void *value, int size)
-{
- char *buffer = NULL;
- int result;
- struct yaffs_ext_tags tags;
- struct yaffs_dev *dev = obj->my_dev;
- int x_offs = sizeof(struct yaffs_obj_hdr);
- int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
-
- char *x_buffer;
-
- int retval = 0;
-
- if (obj->hdr_chunk < 1)
- return -ENODATA;
-
- /* If we know that the object has no xattribs then don't do all the
- * reading and parsing.
- */
- if (obj->xattr_known && !obj->has_xattr) {
- if (name)
- return -ENODATA;
- else
- return 0;
- }
-
- buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__);
- if (!buffer)
- return -ENOMEM;
-
- result =
- yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
-
- if (result != YAFFS_OK)
- retval = -ENOENT;
- else {
- x_buffer = buffer + x_offs;
-
- if (!obj->xattr_known) {
- obj->has_xattr = nval_hasvalues(x_buffer, x_size);
- obj->xattr_known = 1;
- }
-
- if (name)
- retval = nval_get(x_buffer, x_size, name, value, size);
- else
- retval = nval_list(x_buffer, x_size, value, size);
- }
- yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__);
- return retval;
-}
-
-int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
- const void *value, int size, int flags)
-{
- return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
-}
-
-int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
-{
- return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
-}
-
-int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
- int size)
-{
- return yaffs_do_xattrib_fetch(obj, name, value, size);
-}
-
-int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
-{
- return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
-}
-
-/*---------------------------- Initialisation code -------------------------------------- */
+/*--------------------------- Initialisation code -------------------------- */
static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
{
if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
- dev->cache = YMALLOC(cache_bytes);
+ dev->cache = kmalloc(cache_bytes, GFP_NOFS);
buf = (u8 *) dev->cache;
dev->cache[i].last_use = 0;
dev->cache[i].dirty = 0;
dev->cache[i].data = buf =
- YMALLOC_DMA(dev->param.total_bytes_per_chunk);
+ kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
}
if (!buf)
init_failed = 1;
if (!init_failed) {
dev->gc_cleanup_list =
- YMALLOC(dev->param.chunks_per_block * sizeof(u32));
+ kmalloc(dev->param.chunks_per_block * sizeof(u32),
+ GFP_NOFS);
if (!dev->gc_cleanup_list)
init_failed = 1;
}
for (i = 0; i < dev->param.n_caches; i++) {
if (dev->cache[i].data)
- YFREE(dev->cache[i].data);
+ kfree(dev->cache[i].data);
dev->cache[i].data = NULL;
}
- YFREE(dev->cache);
+ kfree(dev->cache);
dev->cache = NULL;
}
- YFREE(dev->gc_cleanup_list);
+ kfree(dev->gc_cleanup_list);
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
- YFREE(dev->temp_buffer[i].buffer);
+ kfree(dev->temp_buffer[i].buffer);
dev->is_mounted = 0;
module_param(yaffs_gc_control, uint, 0644);
module_param(yaffs_bg_enable, uint, 0644);
-#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
-
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
#define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
} while(0)
-static void yaffs_put_super(struct super_block *sb);
-
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
- loff_t * pos);
-static ssize_t yaffs_hold_space(struct file *f);
-static void yaffs_release_space(struct file *f);
-
-static int yaffs_file_flush(struct file *file, fl_owner_t id);
-
-static int yaffs_sync_object(struct file *file, int datasync);
-
-static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
-
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *n);
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *n);
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *dentry);
-static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
- const char *symname);
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
-
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
- dev_t dev);
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry);
-static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
-
-static int yaffs_sync_fs(struct super_block *sb, int wait);
-static void yaffs_write_super(struct super_block *sb);
-
-static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
-
-#ifdef YAFFS_HAS_PUT_INODE
-static void yaffs_put_inode(struct inode *inode);
-#endif
-
-static void yaffs_evict_inode(struct inode *);
-
-static int yaffs_readpage(struct file *file, struct page *page);
-static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
-
-#ifdef CONFIG_YAFFS_XATTR
-static int yaffs_setxattr(struct dentry *dentry, const char *name,
- const void *value, size_t size, int flags);
-static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
- size_t size);
-static int yaffs_removexattr(struct dentry *dentry, const char *name);
-static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
-#endif
-
-static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata);
-static int yaffs_write_end(struct file *filp, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *pg, void *fsdadata);
-
-static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
- int buflen);
-void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
-
-static void yaffs_touch_super(struct yaffs_dev *dev);
-
-static int yaffs_vfs_setattr(struct inode *, struct iattr *);
-
-static struct address_space_operations yaffs_file_address_operations = {
- .readpage = yaffs_readpage,
- .writepage = yaffs_writepage,
- .write_begin = yaffs_write_begin,
- .write_end = yaffs_write_end,
-};
-
-static const struct file_operations yaffs_file_operations = {
- .read = do_sync_read,
- .write = do_sync_write,
- .aio_read = generic_file_aio_read,
- .aio_write = generic_file_aio_write,
- .mmap = generic_file_mmap,
- .flush = yaffs_file_flush,
- .fsync = yaffs_sync_object,
- .splice_read = generic_file_splice_read,
- .splice_write = generic_file_splice_write,
- .llseek = generic_file_llseek,
-};
-
-static const struct inode_operations yaffs_file_inode_operations = {
- .setattr = yaffs_setattr,
-#ifdef CONFIG_YAFFS_XATTR
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-#endif
-};
-
-static const struct inode_operations yaffs_symlink_inode_operations = {
- .readlink = yaffs_readlink,
- .follow_link = yaffs_follow_link,
- .put_link = yaffs_put_link,
- .setattr = yaffs_setattr,
-#ifdef CONFIG_YAFFS_XATTR
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-#endif
-};
-
-static const struct inode_operations yaffs_dir_inode_operations = {
- .create = yaffs_create,
- .lookup = yaffs_lookup,
- .link = yaffs_link,
- .unlink = yaffs_unlink,
- .symlink = yaffs_symlink,
- .mkdir = yaffs_mkdir,
- .rmdir = yaffs_unlink,
- .mknod = yaffs_mknod,
- .rename = yaffs_rename,
- .setattr = yaffs_setattr,
-#ifdef CONFIG_YAFFS_XATTR
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-#endif
-};
-
-static const struct file_operations yaffs_dir_operations = {
- .read = generic_read_dir,
- .readdir = yaffs_readdir,
- .fsync = yaffs_sync_object,
- .llseek = generic_file_llseek,
-};
-
-static const struct super_operations yaffs_super_ops = {
- .statfs = yaffs_statfs,
-#ifdef YAFFS_HAS_PUT_INODE
- .put_inode = yaffs_put_inode,
-#endif
- .put_super = yaffs_put_super,
- .evict_inode = yaffs_evict_inode,
- .sync_fs = yaffs_sync_fs,
- .write_super = yaffs_write_super,
-};
-
-static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
-{
- setattr_copy(inode, attr);
- return 0;
-}
-
-static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
-{
- truncate_setsize(inode, newsize);
- return 0;
-}
static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
{
mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
}
-/* ExportFS support */
-static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
- uint32_t generation)
-{
- return Y_IGET(sb, ino);
-}
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+ struct yaffs_obj *obj);
-static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
- struct fid *fid, int fh_len,
- int fh_type)
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
{
- return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
- yaffs2_nfs_get_inode);
-}
+ struct inode *inode;
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
- struct fid *fid, int fh_len,
- int fh_type)
-{
- return generic_fh_to_parent(sb, fid, fh_len, fh_type,
- yaffs2_nfs_get_inode);
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_iget for %lu\n"), ino));
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ /* NB This is called as a side effect of other functions, but
+ * we had to release the lock to prevent deadlocks, so
+ * need to lock again.
+ */
+
+ yaffs_gross_lock(dev);
+
+ obj = yaffs_find_by_number(dev, inode->i_ino);
+
+ yaffs_fill_inode_from_obj(inode, obj);
+
+ yaffs_gross_unlock(dev);
+
+ unlock_new_inode(inode);
+ return inode;
}
-struct dentry *yaffs2_get_parent(struct dentry *dentry)
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+ struct yaffs_obj *obj)
{
-
- struct super_block *sb = dentry->d_inode->i_sb;
- struct dentry *parent = ERR_PTR(-ENOENT);
struct inode *inode;
- unsigned long parent_ino;
- struct yaffs_obj *d_obj;
- struct yaffs_obj *parent_obj;
- d_obj = yaffs_inode_to_obj(dentry->d_inode);
+ if (!sb) {
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_get_inode for NULL super_block!!\n")));
+ return NULL;
- if (d_obj) {
- parent_obj = d_obj->parent;
- if (parent_obj) {
- parent_ino = yaffs_get_obj_inode(parent_obj);
- inode = Y_IGET(sb, parent_ino);
+ }
+
+ if (!obj) {
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_get_inode for NULL object!!\n")));
+ return NULL;
- if (IS_ERR(inode)) {
- parent = ERR_CAST(inode);
- } else {
- parent = d_obtain_alias(inode);
- if (!IS_ERR(parent)) {
- parent = ERR_PTR(-ENOMEM);
- iput(inode);
- }
- }
- }
}
- return parent;
-}
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
-/* Just declare a zero structure as a NULL value implies
- * using the default functions of exportfs.
- */
+ inode = yaffs_iget(sb, obj->obj_id);
+ if (IS_ERR(inode))
+ return NULL;
-static struct export_operations yaffs_export_ops = {
- .fh_to_dentry = yaffs2_fh_to_dentry,
- .fh_to_parent = yaffs2_fh_to_parent,
- .get_parent = yaffs2_get_parent,
-};
+ /* NB Side effect: iget calls back to yaffs_read_inode(). */
+ /* iget also increments the inode's i_count */
+ /* NB You can't be holding gross_lock or deadlock will happen! */
-/*-----------------------------------------------------------------*/
-/* Directory search context allows us to unlock access to yaffs during
- * filldir without causing problems with the directory being modified.
- * This is similar to the tried and tested mechanism used in yaffs direct.
- *
- * A search context iterates along a doubly linked list of siblings in the
- * directory. If the iterating object is deleted then this would corrupt
- * the list iteration, likely causing a crash. The search context avoids
- * this by using the remove_obj_fn to move the search context to the
- * next object before the object is deleted.
- *
- * Many readdirs (and thus seach conexts) may be alive simulateously so
- * each struct yaffs_dev has a list of these.
- *
- * A seach context lives for the duration of a readdir.
- *
- * All these functions must be called while yaffs is locked.
- */
+ return inode;
+}
-struct yaffs_search_context {
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+ dev_t rdev)
+{
+ struct inode *inode;
+
+ struct yaffs_obj *obj = NULL;
struct yaffs_dev *dev;
- struct yaffs_obj *dir_obj;
- struct yaffs_obj *next_return;
- struct list_head others;
-};
-/*
- * yaffs_new_search() creates a new search context, initialises it and
- * adds it to the device's search context list.
- *
- * Called at start of readdir.
- */
-static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
-{
- struct yaffs_dev *dev = dir->my_dev;
- struct yaffs_search_context *sc =
- YMALLOC(sizeof(struct yaffs_search_context));
- if (sc) {
- sc->dir_obj = dir;
- sc->dev = dev;
- if (list_empty(&sc->dir_obj->variant.dir_variant.children))
- sc->next_return = NULL;
- else
- sc->next_return =
- list_entry(dir->variant.dir_variant.children.next,
- struct yaffs_obj, siblings);
- INIT_LIST_HEAD(&sc->others);
- list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
- }
- return sc;
-}
+ struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
-/*
- * yaffs_search_end() disposes of a search context and cleans up.
- */
-static void yaffs_search_end(struct yaffs_search_context *sc)
-{
- if (sc) {
- list_del(&sc->others);
- YFREE(sc);
+ int error = -ENOSPC;
+ uid_t uid = current->cred->fsuid;
+ gid_t gid =
+ (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
+
+ if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+ mode |= S_ISGID;
+
+ if (parent) {
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_mknod: parent object %d type %d\n"),
+ parent->obj_id, parent->variant_type));
+ } else {
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_mknod: could not get parent object\n")));
+ return -EPERM;
}
-}
-/*
- * yaffs_search_advance() moves a search context to the next object.
- * Called when the search iterates or when an object removal causes
- * the search context to be moved to the next object.
- */
-static void yaffs_search_advance(struct yaffs_search_context *sc)
-{
- if (!sc)
- return;
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
+ "mode %x dev %x\n"),
+ dentry->d_name.name, mode, rdev));
- if (sc->next_return == NULL ||
- list_empty(&sc->dir_obj->variant.dir_variant.children))
- sc->next_return = NULL;
- else {
- struct list_head *next = sc->next_return->siblings.next;
+ dev = parent->my_dev;
- if (next == &sc->dir_obj->variant.dir_variant.children)
- sc->next_return = NULL; /* end of list */
- else
- sc->next_return =
- list_entry(next, struct yaffs_obj, siblings);
- }
-}
+ yaffs_gross_lock(dev);
-/*
- * yaffs_remove_obj_callback() is called when an object is unlinked.
- * We check open search contexts and advance any which are currently
- * on the object being iterated.
- */
-static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
-{
+ switch (mode & S_IFMT) {
+ default:
+ /* Special (socket, fifo, device...) */
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
+ obj =
+ yaffs_create_special(parent, dentry->d_name.name, mode, uid,
+ gid, old_encode_dev(rdev));
+ break;
+ case S_IFREG: /* file */
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
+ obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
+ gid);
+ break;
+ case S_IFDIR: /* directory */
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making directory\n")));
+ obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
+ uid, gid);
+ break;
+ case S_IFLNK: /* symlink */
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
+ obj = NULL; /* Do we ever get here? */
+ break;
+ }
- struct list_head *i;
- struct yaffs_search_context *sc;
- struct list_head *search_contexts =
- &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
+ /* Can not call yaffs_get_inode() with gross lock held */
+ yaffs_gross_unlock(dev);
- /* Iterate through the directory search contexts.
- * If any are currently on the object being removed, then advance
- * the search context to the next object to prevent a hanging pointer.
- */
- list_for_each(i, search_contexts) {
- if (i) {
- sc = list_entry(i, struct yaffs_search_context, others);
- if (sc->next_return == obj)
- yaffs_search_advance(sc);
- }
+ if (obj) {
+ inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+ d_instantiate(dentry, inode);
+ update_dir_time(dir);
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_mknod created object %d count = %d\n"),
+ obj->obj_id, atomic_read(&inode->i_count)));
+ error = 0;
+ yaffs_fill_inode_from_obj(dir, parent);
+ } else {
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod failed making object\n")));
+ error = -ENOMEM;
}
+ return error;
}
-/*-----------------------------------------------------------------*/
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ int ret_val;
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
+ ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+ return ret_val;
+}
-static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
- int buflen)
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *n)
{
- unsigned char *alias;
- int ret;
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_create\n")));
+ return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
- struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ struct inode *inode = old_dentry->d_inode;
+ struct yaffs_obj *obj = NULL;
+ struct yaffs_obj *link = NULL;
+ struct yaffs_dev *dev;
+
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
+
+ obj = yaffs_inode_to_obj(inode);
+ dev = obj->my_dev;
yaffs_gross_lock(dev);
- alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+ if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
+ link =
+ yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
+ obj);
+
+ if (link) {
+ old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
+ d_instantiate(dentry, old_dentry->d_inode);
+ atomic_inc(&old_dentry->d_inode->i_count);
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_link link count %d i_count %d\n"),
+ old_dentry->d_inode->i_nlink,
+ atomic_read(&old_dentry->d_inode->i_count)));
+ }
yaffs_gross_unlock(dev);
- if (!alias)
- return -ENOMEM;
+ if (link) {
+ update_dir_time(dir);
+ return 0;
+ }
- ret = vfs_readlink(dentry, buffer, buflen, alias);
- kfree(alias);
- return ret;
+ return -EPERM;
}
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
{
- unsigned char *alias;
- void *ret;
- struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev;
+ uid_t uid = current->cred->fsuid;
+ gid_t gid =
+ (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
- yaffs_gross_lock(dev);
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
- alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+ dev = yaffs_inode_to_obj(dir)->my_dev;
+ yaffs_gross_lock(dev);
+ obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
+ S_IFLNK | S_IRWXUGO, uid, gid, symname);
yaffs_gross_unlock(dev);
- if (!alias) {
- ret = ERR_PTR(-ENOMEM);
- goto out;
- }
+ if (obj) {
+ struct inode *inode;
- nd_set_link(nd, alias);
- ret = (void *)alias;
-out:
- return ret;
-}
+ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+ d_instantiate(dentry, inode);
+ update_dir_time(dir);
+ T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
+ return 0;
+ } else {
+ T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
+ }
-void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
-{
- kfree(alias);
+ return -ENOMEM;
}
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
- struct yaffs_obj *obj);
-
-/*
- * Lookup is used to find objects in the fs
- */
-
static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *n)
{
struct yaffs_obj *obj;
- struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
+ struct inode *inode = NULL;
struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
return NULL;
}
-#ifdef YAFFS_HAS_PUT_INODE
-
-/* For now put inode is just for debugging
- * Put inode is called when the inode **structure** is put.
- */
-static void yaffs_put_inode(struct inode *inode)
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
{
+ int ret_val;
+
+ struct yaffs_dev *dev;
+ struct yaffs_obj *obj;
+
T(YAFFS_TRACE_OS,
- (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
- atomic_read(&inode->i_count)));
+ (TSTR("yaffs_unlink %d:%s\n"),
+ (int)(dir->i_ino), dentry->d_name.name));
+ obj = yaffs_inode_to_obj(dir);
+ dev = obj->my_dev;
+
+ yaffs_gross_lock(dev);
+ ret_val = yaffs_unlinker(obj, dentry->d_name.name);
+
+ if (ret_val == YAFFS_OK) {
+ dentry->d_inode->i_nlink--;
+ dir->i_version++;
+ yaffs_gross_unlock(dev);
+ mark_inode_dirty(dentry->d_inode);
+ update_dir_time(dir);
+ return 0;
+ }
+ yaffs_gross_unlock(dev);
+ return -ENOTEMPTY;
}
-#endif
-static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
+static int yaffs_sync_object(struct file *file, int datasync)
{
- /* Clear the association between the inode and
- * the struct yaffs_obj.
- */
- obj->my_inode = NULL;
- yaffs_inode_to_obj_lv(inode) = NULL;
- /* If the object freeing was deferred, then the real
- * free happens now.
- * This should fix the inode inconsistency problem.
- */
- yaffs_handle_defered_free(obj);
-}
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev;
+ struct dentry *dentry = file->f_path.dentry;
-/* yaffs_evict_inode combines into one operation what was previously done in
- * yaffs_clear_inode() and yaffs_delete_inode()
+ obj = yaffs_dentry_to_obj(dentry);
+
+ dev = obj->my_dev;
+
+ T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, (TSTR("yaffs_sync_object\n")));
+ yaffs_gross_lock(dev);
+ yaffs_flush_file(obj, 1, datasync);
+ yaffs_gross_unlock(dev);
+ return 0;
+}
+/*
+ * The VFS layer already does all the dentry stuff for rename.
*
+ * NB: POSIX says you can rename an object over an old object of the same name
*/
-static void yaffs_evict_inode(struct inode *inode)
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
{
- struct yaffs_obj *obj;
struct yaffs_dev *dev;
- int deleteme = 0;
+ int ret_val = YAFFS_FAIL;
+ struct yaffs_obj *target;
- obj = yaffs_inode_to_obj(inode);
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
+ dev = yaffs_inode_to_obj(old_dir)->my_dev;
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
- atomic_read(&inode->i_count),
- obj ? "object exists" : "null object"));
+ yaffs_gross_lock(dev);
- if (!inode->i_nlink && !is_bad_inode(inode))
- deleteme = 1;
- truncate_inode_pages(&inode->i_data, 0);
- end_writeback(inode);
+ /* Check if the target is an existing directory that is not empty. */
+ target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
+ new_dentry->d_name.name);
- if (deleteme && obj) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- yaffs_del_obj(obj);
- yaffs_gross_unlock(dev);
- }
- if (obj) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- yaffs_unstitch_obj(inode, obj);
- yaffs_gross_unlock(dev);
+ if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
+ !list_empty(&target->variant.dir_variant.children)) {
+
+ T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
+
+ ret_val = YAFFS_FAIL;
+ } else {
+ /* Now does unlinking internally using shadowing mechanism */
+ T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
+
+ ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
+ old_dentry->d_name.name,
+ yaffs_inode_to_obj(new_dir),
+ new_dentry->d_name.name);
}
+ yaffs_gross_unlock(dev);
+ if (ret_val == YAFFS_OK) {
+ if (target) {
+ new_dentry->d_inode->i_nlink--;
+ mark_inode_dirty(new_dentry->d_inode);
+ }
+
+ update_dir_time(old_dir);
+ if (old_dir != new_dir)
+ update_dir_time(new_dir);
+ return 0;
+ } else {
+ return -ENOTEMPTY;
+ }
}
-static int yaffs_file_flush(struct file *file, fl_owner_t id)
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
{
- struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
-
- struct yaffs_dev *dev = obj->my_dev;
+ struct inode *inode = dentry->d_inode;
+ int error = 0;
+ struct yaffs_dev *dev;
T(YAFFS_TRACE_OS,
- (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
- obj->dirty ? "dirty" : "clean"));
+ (TSTR("yaffs_setattr of object %d\n"),
+ yaffs_inode_to_obj(inode)->obj_id));
- yaffs_gross_lock(dev);
+ /* Fail if a requested resize >= 2GB */
+ if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
+ error = -EINVAL;
- yaffs_flush_file(obj, 1, 0);
+ if (error == 0)
+ error = inode_change_ok(inode, attr);
+ if (error == 0) {
+ int result;
+ if (!error) {
+ setattr_copy(inode, attr);
+ T(YAFFS_TRACE_OS, (TSTR("inode_setattr called\n")));
+ if (attr->ia_valid & ATTR_SIZE) {
+ truncate_setsize(inode, attr->ia_size);
+ inode->i_blocks = (inode->i_size + 511) >> 9;
+ }
+ }
+ dev = yaffs_inode_to_obj(inode)->my_dev;
+ if (attr->ia_valid & ATTR_SIZE) {
+ T(YAFFS_TRACE_OS, (TSTR("resize to %d(%x)\n"),
+ (int)(attr->ia_size),
+ (int)(attr->ia_size)));
+ }
+ yaffs_gross_lock(dev);
+ result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
+ if (result == YAFFS_OK) {
+ error = 0;
+ } else {
+ error = -EPERM;
+ }
+ yaffs_gross_unlock(dev);
- yaffs_gross_unlock(dev);
+ }
- return 0;
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_setattr done returning %d\n"), error));
+
+ return error;
}
-static int yaffs_readpage_nolock(struct file *f, struct page *pg)
+#ifdef CONFIG_YAFFS_XATTR
+static int yaffs_setxattr(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
{
- /* Lifted from jffs2 */
-
- struct yaffs_obj *obj;
- unsigned char *pg_buf;
- int ret;
-
+ struct inode *inode = dentry->d_inode;
+ int error = 0;
struct yaffs_dev *dev;
+ struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
- (unsigned)(pg->index << PAGE_CACHE_SHIFT),
- (unsigned)PAGE_CACHE_SIZE));
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- dev = obj->my_dev;
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr of object %d\n"), obj->obj_id));
- BUG_ON(!PageLocked(pg));
+ if (error == 0) {
+ int result;
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ result = yaffs_set_xattrib(obj, name, value, size, flags);
+ if (result == YAFFS_OK)
+ error = 0;
+ else if (result < 0)
+ error = result;
+ yaffs_gross_unlock(dev);
- pg_buf = kmap(pg);
- /* FIXME: Can kmap fail? */
+ }
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr done returning %d\n"), error));
- yaffs_gross_lock(dev);
+ return error;
+}
- ret = yaffs_file_rd(obj, pg_buf,
- pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
+static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name, void *buff,
+ size_t size)
+{
+ struct inode *inode = dentry->d_inode;
+ int error = 0;
+ struct yaffs_dev *dev;
+ struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
- yaffs_gross_unlock(dev);
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_getxattr \"%s\" from object %d\n"), name, obj->obj_id));
- if (ret >= 0)
- ret = 0;
+ if (error == 0) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ error = yaffs_get_xattrib(obj, name, buff, size);
+ yaffs_gross_unlock(dev);
- if (ret) {
- ClearPageUptodate(pg);
- SetPageError(pg);
- } else {
- SetPageUptodate(pg);
- ClearPageError(pg);
}
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_getxattr done returning %d\n"), error));
- flush_dcache_page(pg);
- kunmap(pg);
-
- T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
- return ret;
+ return error;
}
-static int yaffs_readpage_unlock(struct file *f, struct page *pg)
+static int yaffs_removexattr(struct dentry *dentry, const char *name)
{
- int ret = yaffs_readpage_nolock(f, pg);
- UnlockPage(pg);
- return ret;
-}
+ struct inode *inode = dentry->d_inode;
+ int error = 0;
+ struct yaffs_dev *dev;
+ struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-static int yaffs_readpage(struct file *f, struct page *pg)
-{
- int ret;
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_removexattr of object %d\n"), obj->obj_id));
- T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
- ret = yaffs_readpage_unlock(f, pg);
- T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
- return ret;
-}
+ if (error == 0) {
+ int result;
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ result = yaffs_remove_xattrib(obj, name);
+ if (result == YAFFS_OK)
+ error = 0;
+ else if (result < 0)
+ error = result;
+ yaffs_gross_unlock(dev);
-/* writepage inspired by/stolen from smbfs */
+ }
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_removexattr done returning %d\n"), error));
-static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
+ return error;
+}
+
+static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
{
+ struct inode *inode = dentry->d_inode;
+ int error = 0;
struct yaffs_dev *dev;
- struct address_space *mapping = page->mapping;
- struct inode *inode;
- unsigned long end_index;
- char *buffer;
- struct yaffs_obj *obj;
- int n_written = 0;
- unsigned n_bytes;
- loff_t i_size;
-
- if (!mapping)
- BUG();
- inode = mapping->host;
- if (!inode)
- BUG();
- i_size = i_size_read(inode);
-
- end_index = i_size >> PAGE_CACHE_SHIFT;
-
- if (page->index < end_index)
- n_bytes = PAGE_CACHE_SIZE;
- else {
- n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
-
- if (page->index > end_index || !n_bytes) {
- T(YAFFS_TRACE_OS,
- (TSTR
- ("yaffs_writepage at %08x, inode size = %08x!!!\n"),
- (unsigned)(page->index << PAGE_CACHE_SHIFT),
- (unsigned)inode->i_size));
- T(YAFFS_TRACE_OS,
- (TSTR(" -> don't care!!\n")));
-
- zero_user_segment(page, 0, PAGE_CACHE_SIZE);
- set_page_writeback(page);
- unlock_page(page);
- end_page_writeback(page);
- return 0;
- }
- }
-
- if (n_bytes != PAGE_CACHE_SIZE)
- zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
-
- get_page(page);
-
- buffer = kmap(page);
-
- obj = yaffs_inode_to_obj(inode);
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
+ struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
T(YAFFS_TRACE_OS,
- (TSTR("yaffs_writepage at %08x, size %08x\n"),
- (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
- T(YAFFS_TRACE_OS,
- (TSTR("writepag0: obj = %05x, ino = %05x\n"),
- (int)obj->variant.file_variant.file_size, (int)inode->i_size));
-
- n_written = yaffs_wr_file(obj, buffer,
- page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
-
- yaffs_touch_super(dev);
-
- T(YAFFS_TRACE_OS,
- (TSTR("writepag1: obj = %05x, ino = %05x\n"),
- (int)obj->variant.file_variant.file_size, (int)inode->i_size));
-
- yaffs_gross_unlock(dev);
-
- kunmap(page);
- set_page_writeback(page);
- unlock_page(page);
- end_page_writeback(page);
- put_page(page);
-
- return (n_written == n_bytes) ? 0 : -ENOSPC;
-}
-
-static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
-{
- struct page *pg = NULL;
- pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-
- int ret = 0;
- int space_held = 0;
-
- /* Get a page */
- pg = grab_cache_page_write_begin(mapping, index, flags);
-
- *pagep = pg;
- if (!pg) {
- ret = -ENOMEM;
- goto out;
- }
- T(YAFFS_TRACE_OS,
- (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
- (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0));
-
- /* Get fs space */
- space_held = yaffs_hold_space(filp);
-
- if (!space_held) {
- ret = -ENOSPC;
- goto out;
- }
-
- /* Update page if required */
-
- if (!Page_Uptodate(pg))
- ret = yaffs_readpage_nolock(filp, pg);
-
- if (ret)
- goto out;
-
- /* Happy path return */
- T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
-
- return 0;
-
-out:
- T(YAFFS_TRACE_OS,
- (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
- if (space_held)
- yaffs_release_space(filp);
- if (pg) {
- unlock_page(pg);
- page_cache_release(pg);
- }
- return ret;
-}
-
-static int yaffs_write_end(struct file *filp, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *pg, void *fsdadata)
-{
- int ret = 0;
- void *addr, *kva;
- uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
-
- kva = kmap(pg);
- addr = kva + offset_into_page;
-
- T(YAFFS_TRACE_OS,
- ("yaffs_write_end addr %p pos %x n_bytes %d\n",
- addr, (unsigned)pos, copied));
+ (TSTR("yaffs_listxattr of object %d\n"), obj->obj_id));
- ret = yaffs_file_write(filp, addr, copied, &pos);
+ if (error == 0) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ error = yaffs_list_xattrib(obj, buff, size);
+ yaffs_gross_unlock(dev);
- if (ret != copied) {
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_write_end not same size ret %d copied %d\n"),
- ret, copied));
- SetPageError(pg);
- } else {
- /* Nothing */
}
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_listxattr done returning %d\n"), error));
- kunmap(pg);
-
- yaffs_release_space(filp);
- unlock_page(pg);
- page_cache_release(pg);
- return ret;
+ return error;
}
-static void yaffs_fill_inode_from_obj(struct inode *inode,
- struct yaffs_obj *obj)
-{
- if (inode && obj) {
-
- /* Check mode against the variant type and attempt to repair if broken. */
- u32 mode = obj->yst_mode;
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- if (!S_ISREG(mode)) {
- obj->yst_mode &= ~S_IFMT;
- obj->yst_mode |= S_IFREG;
- }
-
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- if (!S_ISLNK(mode)) {
- obj->yst_mode &= ~S_IFMT;
- obj->yst_mode |= S_IFLNK;
- }
-
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- if (!S_ISDIR(mode)) {
- obj->yst_mode &= ~S_IFMT;
- obj->yst_mode |= S_IFDIR;
- }
-
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_SPECIAL:
- default:
- /* TODO? */
- break;
- }
-
- inode->i_flags |= S_NOATIME;
-
- inode->i_ino = obj->obj_id;
- inode->i_mode = obj->yst_mode;
- inode->i_uid = obj->yst_uid;
- inode->i_gid = obj->yst_gid;
-
- inode->i_rdev = old_decode_dev(obj->yst_rdev);
-
- inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
- inode->i_atime.tv_nsec = 0;
- inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
- inode->i_mtime.tv_nsec = 0;
- inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
- inode->i_ctime.tv_nsec = 0;
- inode->i_size = yaffs_get_obj_length(obj);
- inode->i_blocks = (inode->i_size + 511) >> 9;
-
- inode->i_nlink = yaffs_get_obj_link_count(obj);
-
- T(YAFFS_TRACE_OS,
- (TSTR
- ("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
- inode->i_mode, inode->i_uid, inode->i_gid,
- (int)inode->i_size, atomic_read(&inode->i_count)));
-
- switch (obj->yst_mode & S_IFMT) {
- default: /* fifo, device or socket */
- init_special_inode(inode, obj->yst_mode,
- old_decode_dev(obj->yst_rdev));
- break;
- case S_IFREG: /* file */
- inode->i_op = &yaffs_file_inode_operations;
- inode->i_fop = &yaffs_file_operations;
- inode->i_mapping->a_ops =
- &yaffs_file_address_operations;
- break;
- case S_IFDIR: /* directory */
- inode->i_op = &yaffs_dir_inode_operations;
- inode->i_fop = &yaffs_dir_operations;
- break;
- case S_IFLNK: /* symlink */
- inode->i_op = &yaffs_symlink_inode_operations;
- break;
- }
-
- yaffs_inode_to_obj_lv(inode) = obj;
-
- obj->my_inode = inode;
+#endif
- } else {
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_fill_inode invalid parameters\n")));
- }
+static const struct inode_operations yaffs_dir_inode_operations = {
+ .create = yaffs_create,
+ .lookup = yaffs_lookup,
+ .link = yaffs_link,
+ .unlink = yaffs_unlink,
+ .symlink = yaffs_symlink,
+ .mkdir = yaffs_mkdir,
+ .rmdir = yaffs_unlink,
+ .mknod = yaffs_mknod,
+ .rename = yaffs_rename,
+ .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+ .setxattr = yaffs_setxattr,
+ .getxattr = yaffs_getxattr,
+ .listxattr = yaffs_listxattr,
+ .removexattr = yaffs_removexattr,
+#endif
+};
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the remove_obj_fn to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each struct yaffs_dev has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
-}
+struct yaffs_search_context {
+ struct yaffs_dev *dev;
+ struct yaffs_obj *dir_obj;
+ struct yaffs_obj *next_return;
+ struct list_head others;
+};
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
- struct yaffs_obj *obj)
+/*
+ * yaffs_new_search() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
{
- struct inode *inode;
-
- if (!sb) {
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_get_inode for NULL super_block!!\n")));
- return NULL;
-
- }
-
- if (!obj) {
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_get_inode for NULL object!!\n")));
- return NULL;
-
+ struct yaffs_dev *dev = dir->my_dev;
+ struct yaffs_search_context *sc =
+ kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
+ if (sc) {
+ sc->dir_obj = dir;
+ sc->dev = dev;
+ if (list_empty(&sc->dir_obj->variant.dir_variant.children))
+ sc->next_return = NULL;
+ else
+ sc->next_return =
+ list_entry(dir->variant.dir_variant.children.next,
+ struct yaffs_obj, siblings);
+ INIT_LIST_HEAD(&sc->others);
+ list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
}
-
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
-
- inode = Y_IGET(sb, obj->obj_id);
- if (IS_ERR(inode))
- return NULL;
-
- /* NB Side effect: iget calls back to yaffs_read_inode(). */
- /* iget also increments the inode's i_count */
- /* NB You can't be holding gross_lock or deadlock will happen! */
-
- return inode;
+ return sc;
}
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
- loff_t * pos)
+/*
+ * yaffs_search_end() disposes of a search context and cleans up.
+ */
+static void yaffs_search_end(struct yaffs_search_context *sc)
{
- struct yaffs_obj *obj;
- int n_written, ipos;
- struct inode *inode;
- struct yaffs_dev *dev;
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- inode = f->f_dentry->d_inode;
-
- if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
- ipos = inode->i_size;
- else
- ipos = *pos;
-
- if (!obj)
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_file_write: hey obj is null!\n")));
- else
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
- "to object %d at %d(%x)\n"),
- (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos));
-
- n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
-
- yaffs_touch_super(dev);
-
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
- (unsigned)n, (unsigned)n));
-
- if (n_written > 0) {
- ipos += n_written;
- *pos = ipos;
- if (ipos > inode->i_size) {
- inode->i_size = ipos;
- inode->i_blocks = (ipos + 511) >> 9;
-
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_file_write size updated to %d bytes, "
- "%d blocks\n"), ipos, (int)(inode->i_blocks)));
- }
-
+ if (sc) {
+ list_del(&sc->others);
+ kfree(sc);
}
- yaffs_gross_unlock(dev);
- return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
}
-/* Space holding and freeing is done to ensure we have space available for write_begin/end */
-/* For now we just assume few parallel writes and check against a small number. */
-/* Todo: need to do this with a counter to handle parallel reads better */
-
-static ssize_t yaffs_hold_space(struct file *f)
+/*
+ * yaffs_search_advance() moves a search context to the next object.
+ * Called when the search iterates or when an object removal causes
+ * the search context to be moved to the next object.
+ */
+static void yaffs_search_advance(struct yaffs_search_context *sc)
{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
-
- int n_free_chunks;
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- n_free_chunks = yaffs_get_n_free_chunks(dev);
+ if (!sc)
+ return;
- yaffs_gross_unlock(dev);
+ if (sc->next_return == NULL ||
+ list_empty(&sc->dir_obj->variant.dir_variant.children))
+ sc->next_return = NULL;
+ else {
+ struct list_head *next = sc->next_return->siblings.next;
- return (n_free_chunks > 20) ? 1 : 0;
+ if (next == &sc->dir_obj->variant.dir_variant.children)
+ sc->next_return = NULL; /* end of list */
+ else
+ sc->next_return =
+ list_entry(next, struct yaffs_obj, siblings);
+ }
}
-static void yaffs_release_space(struct file *f)
+/*
+ * yaffs_remove_obj_callback() is called when an object is unlinked.
+ * We check open search contexts and advance any which are currently
+ * on the object being iterated.
+ */
+static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
- dev = obj->my_dev;
+ struct list_head *i;
+ struct yaffs_search_context *sc;
+ struct list_head *search_contexts =
+ &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
- yaffs_gross_lock(dev);
+ /* Iterate through the directory search contexts.
+ * If any are currently on the object being removed, then advance
+ * the search context to the next object to prevent a hanging pointer.
+ */
+ list_for_each(i, search_contexts) {
+ if (i) {
+ sc = list_entry(i, struct yaffs_search_context, others);
+ if (sc->next_return == obj)
+ yaffs_search_advance(sc);
+ }
+ }
- yaffs_gross_unlock(dev);
}
static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
return ret_val;
}
-/*
- * File creation. Allocate an inode, and we're done..
- */
+static const struct file_operations yaffs_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = yaffs_readdir,
+ .fsync = yaffs_sync_object,
+ .llseek = generic_file_llseek,
+};
-#define YCRED(x) (x->cred)
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
- dev_t rdev)
-{
- struct inode *inode;
- struct yaffs_obj *obj = NULL;
- struct yaffs_dev *dev;
+static int yaffs_file_flush(struct file *file, fl_owner_t id)
+{
+ struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
- struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
+ struct yaffs_dev *dev = obj->my_dev;
- int error = -ENOSPC;
- uid_t uid = YCRED(current)->fsuid;
- gid_t gid =
- (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
+ obj->dirty ? "dirty" : "clean"));
- if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
- mode |= S_ISGID;
+ yaffs_gross_lock(dev);
- if (parent) {
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_mknod: parent object %d type %d\n"),
- parent->obj_id, parent->variant_type));
- } else {
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_mknod: could not get parent object\n")));
- return -EPERM;
- }
+ yaffs_flush_file(obj, 1, 0);
- T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
- "mode %x dev %x\n"),
- dentry->d_name.name, mode, rdev));
+ yaffs_gross_unlock(dev);
- dev = parent->my_dev;
+ return 0;
+}
- yaffs_gross_lock(dev);
+static const struct file_operations yaffs_file_operations = {
+ .read = do_sync_read,
+ .write = do_sync_write,
+ .aio_read = generic_file_aio_read,
+ .aio_write = generic_file_aio_write,
+ .mmap = generic_file_mmap,
+ .flush = yaffs_file_flush,
+ .fsync = yaffs_sync_object,
+ .splice_read = generic_file_splice_read,
+ .splice_write = generic_file_splice_write,
+ .llseek = generic_file_llseek,
+};
- switch (mode & S_IFMT) {
- default:
- /* Special (socket, fifo, device...) */
- T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
- obj =
- yaffs_create_special(parent, dentry->d_name.name, mode, uid,
- gid, old_encode_dev(rdev));
- break;
- case S_IFREG: /* file */
- T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
- obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
- gid);
- break;
- case S_IFDIR: /* directory */
- T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making directory\n")));
- obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
- uid, gid);
- break;
- case S_IFLNK: /* symlink */
- T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
- obj = NULL; /* Do we ever get here? */
- break;
- }
- /* Can not call yaffs_get_inode() with gross lock held */
- yaffs_gross_unlock(dev);
+/* ExportFS support */
+static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
+ uint32_t generation)
+{
+ return yaffs_iget(sb, ino);
+}
- if (obj) {
- inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
- d_instantiate(dentry, inode);
- update_dir_time(dir);
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_mknod created object %d count = %d\n"),
- obj->obj_id, atomic_read(&inode->i_count)));
- error = 0;
- yaffs_fill_inode_from_obj(dir, parent);
- } else {
- T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod failed making object\n")));
- error = -ENOMEM;
- }
+static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len,
+ int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ yaffs2_nfs_get_inode);
+}
- return error;
+static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len,
+ int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ yaffs2_nfs_get_inode);
}
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
{
- int ret_val;
- T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
- ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
- return ret_val;
+
+ struct super_block *sb = dentry->d_inode->i_sb;
+ struct dentry *parent = ERR_PTR(-ENOENT);
+ struct inode *inode;
+ unsigned long parent_ino;
+ struct yaffs_obj *d_obj;
+ struct yaffs_obj *parent_obj;
+
+ d_obj = yaffs_inode_to_obj(dentry->d_inode);
+
+ if (d_obj) {
+ parent_obj = d_obj->parent;
+ if (parent_obj) {
+ parent_ino = yaffs_get_obj_inode(parent_obj);
+ inode = yaffs_iget(sb, parent_ino);
+
+ if (IS_ERR(inode)) {
+ parent = ERR_CAST(inode);
+ } else {
+ parent = d_obtain_alias(inode);
+ if (!IS_ERR(parent)) {
+ parent = ERR_PTR(-ENOMEM);
+ iput(inode);
+ }
+ }
+ }
+ }
+
+ return parent;
}
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *n)
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops = {
+ .fh_to_dentry = yaffs2_fh_to_dentry,
+ .fh_to_parent = yaffs2_fh_to_parent,
+ .get_parent = yaffs2_get_parent,
+};
+
+
+/*-----------------------------------------------------------------*/
+
+static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
+ int buflen)
{
- T(YAFFS_TRACE_OS, (TSTR("yaffs_create\n")));
- return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+ unsigned char *alias;
+ int ret;
+
+ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+
+ yaffs_gross_unlock(dev);
+
+ if (!alias)
+ return -ENOMEM;
+
+ ret = vfs_readlink(dentry, buffer, buflen, alias);
+ kfree(alias);
+ return ret;
}
-static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
- int ret_val;
+ unsigned char *alias;
+ void *ret;
+ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
- struct yaffs_dev *dev;
- struct yaffs_obj *obj;
+ yaffs_gross_lock(dev);
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_unlink %d:%s\n"),
- (int)(dir->i_ino), dentry->d_name.name));
- obj = yaffs_inode_to_obj(dir);
- dev = obj->my_dev;
+ alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+ yaffs_gross_unlock(dev);
+
+ if (!alias) {
+ ret = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ nd_set_link(nd, alias);
+ ret = (void *)alias;
+out:
+ return ret;
+}
+
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
+{
+ kfree(alias);
+}
- yaffs_gross_lock(dev);
- ret_val = yaffs_unlinker(obj, dentry->d_name.name);
+static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
+{
+ /* Clear the association between the inode and
+ * the struct yaffs_obj.
+ */
+ obj->my_inode = NULL;
+ yaffs_inode_to_obj_lv(inode) = NULL;
- if (ret_val == YAFFS_OK) {
- dentry->d_inode->i_nlink--;
- dir->i_version++;
- yaffs_gross_unlock(dev);
- mark_inode_dirty(dentry->d_inode);
- update_dir_time(dir);
- return 0;
- }
- yaffs_gross_unlock(dev);
- return -ENOTEMPTY;
+ /* If the object freeing was deferred, then the real
+ * free happens now.
+ * This should fix the inode inconsistency problem.
+ */
+ yaffs_handle_defered_free(obj);
}
-/*
- * Create a link...
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
*/
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *dentry)
+static void yaffs_evict_inode(struct inode *inode)
{
- struct inode *inode = old_dentry->d_inode;
- struct yaffs_obj *obj = NULL;
- struct yaffs_obj *link = NULL;
+ struct yaffs_obj *obj;
struct yaffs_dev *dev;
-
- T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
+ int deleteme = 0;
obj = yaffs_inode_to_obj(inode);
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+ atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object"));
- if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
- link =
- yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
- obj);
+ if (!inode->i_nlink && !is_bad_inode(inode))
+ deleteme = 1;
+ truncate_inode_pages(&inode->i_data, 0);
+ end_writeback(inode);
- if (link) {
- old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
- d_instantiate(dentry, old_dentry->d_inode);
- atomic_inc(&old_dentry->d_inode->i_count);
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_link link count %d i_count %d\n"),
- old_dentry->d_inode->i_nlink,
- atomic_read(&old_dentry->d_inode->i_count)));
+ if (deleteme && obj) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ yaffs_del_obj(obj);
+ yaffs_gross_unlock(dev);
+ }
+ if (obj) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ yaffs_unstitch_obj(inode, obj);
+ yaffs_gross_unlock(dev);
}
- yaffs_gross_unlock(dev);
+}
- if (link) {
- update_dir_time(dir);
- return 0;
- }
+static void yaffs_touch_super(struct yaffs_dev *dev)
+{
+ struct super_block *sb = yaffs_dev_to_lc(dev)->super;
- return -EPERM;
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
+ if (sb)
+ sb->s_dirt = 1;
}
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
- const char *symname)
+static int yaffs_readpage_nolock(struct file *f, struct page *pg)
{
+ /* Lifted from jffs2 */
+
struct yaffs_obj *obj;
+ unsigned char *pg_buf;
+ int ret;
+
struct yaffs_dev *dev;
- uid_t uid = YCRED(current)->fsuid;
- gid_t gid =
- (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
- T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
+ (unsigned)(pg->index << PAGE_CACHE_SHIFT),
+ (unsigned)PAGE_CACHE_SIZE));
+
+ obj = yaffs_dentry_to_obj(f->f_dentry);
+
+ dev = obj->my_dev;
+
+ BUG_ON(!PageLocked(pg));
+
+ pg_buf = kmap(pg);
+ /* FIXME: Can kmap fail? */
- dev = yaffs_inode_to_obj(dir)->my_dev;
yaffs_gross_lock(dev);
- obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
- S_IFLNK | S_IRWXUGO, uid, gid, symname);
+
+ ret = yaffs_file_rd(obj, pg_buf,
+ pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
+
yaffs_gross_unlock(dev);
- if (obj) {
- struct inode *inode;
+ if (ret >= 0)
+ ret = 0;
- inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
- d_instantiate(dentry, inode);
- update_dir_time(dir);
- T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
- return 0;
+ if (ret) {
+ ClearPageUptodate(pg);
+ SetPageError(pg);
} else {
- T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
+ SetPageUptodate(pg);
+ ClearPageError(pg);
}
- return -ENOMEM;
+ flush_dcache_page(pg);
+ kunmap(pg);
+
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
+ return ret;
}
-static int yaffs_sync_object(struct file *file, int datasync)
+static int yaffs_readpage_unlock(struct file *f, struct page *pg)
{
+ int ret = yaffs_readpage_nolock(f, pg);
+ UnlockPage(pg);
+ return ret;
+}
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
- struct dentry *dentry = file->f_path.dentry;
-
- obj = yaffs_dentry_to_obj(dentry);
-
- dev = obj->my_dev;
+static int yaffs_readpage(struct file *f, struct page *pg)
+{
+ int ret;
- T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, (TSTR("yaffs_sync_object\n")));
- yaffs_gross_lock(dev);
- yaffs_flush_file(obj, 1, datasync);
- yaffs_gross_unlock(dev);
- return 0;
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
+ ret = yaffs_readpage_unlock(f, pg);
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
+ return ret;
}
-/*
- * The VFS layer already does all the dentry stuff for rename.
- *
- * NB: POSIX says you can rename an object over an old object of the same name
- */
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
+/* writepage inspired by/stolen from smbfs */
+
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
{
struct yaffs_dev *dev;
- int ret_val = YAFFS_FAIL;
- struct yaffs_obj *target;
+ struct address_space *mapping = page->mapping;
+ struct inode *inode;
+ unsigned long end_index;
+ char *buffer;
+ struct yaffs_obj *obj;
+ int n_written = 0;
+ unsigned n_bytes;
+ loff_t i_size;
- T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
- dev = yaffs_inode_to_obj(old_dir)->my_dev;
+ if (!mapping)
+ BUG();
+ inode = mapping->host;
+ if (!inode)
+ BUG();
+ i_size = i_size_read(inode);
- yaffs_gross_lock(dev);
+ end_index = i_size >> PAGE_CACHE_SHIFT;
- /* Check if the target is an existing directory that is not empty. */
- target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
- new_dentry->d_name.name);
+ if (page->index < end_index)
+ n_bytes = PAGE_CACHE_SIZE;
+ else {
+ n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
- if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
- !list_empty(&target->variant.dir_variant.children)) {
+ if (page->index > end_index || !n_bytes) {
+ T(YAFFS_TRACE_OS,
+ (TSTR
+ ("yaffs_writepage at %08x, inode size = %08x!!!\n"),
+ (unsigned)(page->index << PAGE_CACHE_SHIFT),
+ (unsigned)inode->i_size));
+ T(YAFFS_TRACE_OS,
+ (TSTR(" -> don't care!!\n")));
- T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
+ zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+ set_page_writeback(page);
+ unlock_page(page);
+ end_page_writeback(page);
+ return 0;
+ }
+ }
- ret_val = YAFFS_FAIL;
- } else {
- /* Now does unlinking internally using shadowing mechanism */
- T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
+ if (n_bytes != PAGE_CACHE_SIZE)
+ zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
- ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
- old_dentry->d_name.name,
- yaffs_inode_to_obj(new_dir),
- new_dentry->d_name.name);
- }
- yaffs_gross_unlock(dev);
+ get_page(page);
- if (ret_val == YAFFS_OK) {
- if (target) {
- new_dentry->d_inode->i_nlink--;
- mark_inode_dirty(new_dentry->d_inode);
- }
+ buffer = kmap(page);
+
+ obj = yaffs_inode_to_obj(inode);
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_writepage at %08x, size %08x\n"),
+ (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
+ T(YAFFS_TRACE_OS,
+ (TSTR("writepag0: obj = %05x, ino = %05x\n"),
+ (int)obj->variant.file_variant.file_size, (int)inode->i_size));
+
+ n_written = yaffs_wr_file(obj, buffer,
+ page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
+
+ yaffs_touch_super(dev);
+
+ T(YAFFS_TRACE_OS,
+ (TSTR("writepag1: obj = %05x, ino = %05x\n"),
+ (int)obj->variant.file_variant.file_size, (int)inode->i_size));
- update_dir_time(old_dir);
- if (old_dir != new_dir)
- update_dir_time(new_dir);
- return 0;
- } else {
- return -ENOTEMPTY;
- }
+ yaffs_gross_unlock(dev);
+
+ kunmap(page);
+ set_page_writeback(page);
+ unlock_page(page);
+ end_page_writeback(page);
+ put_page(page);
+
+ return (n_written == n_bytes) ? 0 : -ENOSPC;
}
-static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
+/* Space holding and freeing is done to ensure we have space available for
+ * write_begin/end.
+ * For now we just assume few parallel writes and check against a small
+ * number.
+ * Todo: need to do this with a counter to handle parallel reads better.
+ */
+
+static ssize_t yaffs_hold_space(struct file *f)
{
- struct inode *inode = dentry->d_inode;
- int error = 0;
+ struct yaffs_obj *obj;
struct yaffs_dev *dev;
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_setattr of object %d\n"),
- yaffs_inode_to_obj(inode)->obj_id));
+ int n_free_chunks;
- /* Fail if a requested resize >= 2GB */
- if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
- error = -EINVAL;
+ obj = yaffs_dentry_to_obj(f->f_dentry);
- if (error == 0)
- error = inode_change_ok(inode, attr);
- if (error == 0) {
- int result;
- if (!error) {
- error = yaffs_vfs_setattr(inode, attr);
- T(YAFFS_TRACE_OS, (TSTR("inode_setattr called\n")));
- if (attr->ia_valid & ATTR_SIZE) {
- yaffs_vfs_setsize(inode, attr->ia_size);
- inode->i_blocks = (inode->i_size + 511) >> 9;
- }
- }
- dev = yaffs_inode_to_obj(inode)->my_dev;
- if (attr->ia_valid & ATTR_SIZE) {
- T(YAFFS_TRACE_OS, (TSTR("resize to %d(%x)\n"),
- (int)(attr->ia_size),
- (int)(attr->ia_size)));
- }
- yaffs_gross_lock(dev);
- result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
- if (result == YAFFS_OK) {
- error = 0;
- } else {
- error = -EPERM;
- }
- yaffs_gross_unlock(dev);
+ dev = obj->my_dev;
- }
+ yaffs_gross_lock(dev);
- T(YAFFS_TRACE_OS, (TSTR("yaffs_setattr done returning %d\n"), error));
+ n_free_chunks = yaffs_get_n_free_chunks(dev);
- return error;
+ yaffs_gross_unlock(dev);
+
+ return (n_free_chunks > 20) ? 1 : 0;
}
-#ifdef CONFIG_YAFFS_XATTR
-static int yaffs_setxattr(struct dentry *dentry, const char *name,
- const void *value, size_t size, int flags)
+static void yaffs_release_space(struct file *f)
{
- struct inode *inode = dentry->d_inode;
- int error = 0;
+ struct yaffs_obj *obj;
struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
- T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr of object %d\n"), obj->obj_id));
+ obj = yaffs_dentry_to_obj(f->f_dentry);
- if (error == 0) {
- int result;
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- result = yaffs_set_xattrib(obj, name, value, size, flags);
- if (result == YAFFS_OK)
- error = 0;
- else if (result < 0)
- error = result;
- yaffs_gross_unlock(dev);
+ dev = obj->my_dev;
- }
- T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr done returning %d\n"), error));
+ yaffs_gross_lock(dev);
- return error;
+ yaffs_gross_unlock(dev);
}
-static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name, void *buff,
- size_t size)
+static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
{
- struct inode *inode = dentry->d_inode;
- int error = 0;
- struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+ struct page *pg = NULL;
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+
+ int ret = 0;
+ int space_held = 0;
+
+ /* Get a page */
+ pg = grab_cache_page_write_begin(mapping, index, flags);
+ *pagep = pg;
+ if (!pg) {
+ ret = -ENOMEM;
+ goto out;
+ }
T(YAFFS_TRACE_OS,
- (TSTR("yaffs_getxattr \"%s\" from object %d\n"), name, obj->obj_id));
+ (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
+ (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0));
- if (error == 0) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- error = yaffs_get_xattrib(obj, name, buff, size);
- yaffs_gross_unlock(dev);
+ /* Get fs space */
+ space_held = yaffs_hold_space(filp);
+ if (!space_held) {
+ ret = -ENOSPC;
+ goto out;
}
- T(YAFFS_TRACE_OS, (TSTR("yaffs_getxattr done returning %d\n"), error));
- return error;
+ /* Update page if required */
+
+ if (!Page_Uptodate(pg))
+ ret = yaffs_readpage_nolock(filp, pg);
+
+ if (ret)
+ goto out;
+
+ /* Happy path return */
+ T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
+
+ return 0;
+
+out:
+ T(YAFFS_TRACE_OS,
+ (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
+ if (space_held)
+ yaffs_release_space(filp);
+ if (pg) {
+ unlock_page(pg);
+ page_cache_release(pg);
+ }
+ return ret;
}
-static int yaffs_removexattr(struct dentry *dentry, const char *name)
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+ loff_t * pos)
{
- struct inode *inode = dentry->d_inode;
- int error = 0;
+ struct yaffs_obj *obj;
+ int n_written, ipos;
+ struct inode *inode;
struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
- T(YAFFS_TRACE_OS,
- (TSTR("yaffs_removexattr of object %d\n"), obj->obj_id));
+ obj = yaffs_dentry_to_obj(f->f_dentry);
- if (error == 0) {
- int result;
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- result = yaffs_remove_xattrib(obj, name);
- if (result == YAFFS_OK)
- error = 0;
- else if (result < 0)
- error = result;
- yaffs_gross_unlock(dev);
+ dev = obj->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ inode = f->f_dentry->d_inode;
+
+ if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
+ ipos = inode->i_size;
+ else
+ ipos = *pos;
+
+ if (!obj)
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_file_write: hey obj is null!\n")));
+ else
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
+ "to object %d at %d(%x)\n"),
+ (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos));
+
+ n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
+
+ yaffs_touch_super(dev);
- }
T(YAFFS_TRACE_OS,
- (TSTR("yaffs_removexattr done returning %d\n"), error));
+ (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
+ (unsigned)n, (unsigned)n));
- return error;
+ if (n_written > 0) {
+ ipos += n_written;
+ *pos = ipos;
+ if (ipos > inode->i_size) {
+ inode->i_size = ipos;
+ inode->i_blocks = (ipos + 511) >> 9;
+
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_file_write size updated to %d bytes, "
+ "%d blocks\n"), ipos, (int)(inode->i_blocks)));
+ }
+
+ }
+ yaffs_gross_unlock(dev);
+ return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
}
-static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *pg, void *fsdadata)
{
- struct inode *inode = dentry->d_inode;
- int error = 0;
- struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+ int ret = 0;
+ void *addr, *kva;
+ uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
+
+ kva = kmap(pg);
+ addr = kva + offset_into_page;
T(YAFFS_TRACE_OS,
- (TSTR("yaffs_listxattr of object %d\n"), obj->obj_id));
+ ("yaffs_write_end addr %p pos %x n_bytes %d\n",
+ addr, (unsigned)pos, copied));
- if (error == 0) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- error = yaffs_list_xattrib(obj, buff, size);
- yaffs_gross_unlock(dev);
+ ret = yaffs_file_write(filp, addr, copied, &pos);
+ if (ret != copied) {
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_write_end not same size ret %d copied %d\n"),
+ ret, copied));
+ SetPageError(pg);
+ } else {
+ /* Nothing */
}
- T(YAFFS_TRACE_OS, (TSTR("yaffs_listxattr done returning %d\n"), error));
- return error;
-}
+ kunmap(pg);
-#endif
+ yaffs_release_space(filp);
+ unlock_page(pg);
+ page_cache_release(pg);
+ return ret;
+}
static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
return 0;
}
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
-{
- struct inode *inode;
- struct yaffs_obj *obj;
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-
- T(YAFFS_TRACE_OS, (TSTR("yaffs_iget for %lu\n"), ino));
-
- inode = iget_locked(sb, ino);
- if (!inode)
- return ERR_PTR(-ENOMEM);
- if (!(inode->i_state & I_NEW))
- return inode;
-
- /* NB This is called as a side effect of other functions, but
- * we had to release the lock to prevent deadlocks, so
- * need to lock again.
- */
-
- yaffs_gross_lock(dev);
-
- obj = yaffs_find_by_number(dev, inode->i_ino);
-
- yaffs_fill_inode_from_obj(inode, obj);
-
- yaffs_gross_unlock(dev);
-
- unlock_new_inode(inode);
- return inode;
-}
static LIST_HEAD(yaffs_context_list);
struct mutex yaffs_context_lock;
-static void yaffs_put_super(struct super_block *sb)
-{
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-
- T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
-
- T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
- (TSTR("Shutting down yaffs background thread\n")));
- yaffs_bg_stop(dev);
- T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
- (TSTR("yaffs background thread shut down\n")));
-
- yaffs_gross_lock(dev);
-
- yaffs_flush_super(sb, 1);
-
- if (yaffs_dev_to_lc(dev)->put_super_fn)
- yaffs_dev_to_lc(dev)->put_super_fn(sb);
-
- yaffs_deinitialise(dev);
-
- yaffs_gross_unlock(dev);
- mutex_lock(&yaffs_context_lock);
- list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
- mutex_unlock(&yaffs_context_lock);
-
- if (yaffs_dev_to_lc(dev)->spare_buffer) {
- YFREE(yaffs_dev_to_lc(dev)->spare_buffer);
- yaffs_dev_to_lc(dev)->spare_buffer = NULL;
- }
-
- kfree(dev);
-}
-
-static void yaffs_mtd_put_super(struct super_block *sb)
-{
- struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
-
- if (mtd->sync)
- mtd->sync(mtd);
-
- put_mtd_device(mtd);
-}
-
-static void yaffs_touch_super(struct yaffs_dev *dev)
-{
- struct super_block *sb = yaffs_dev_to_lc(dev)->super;
- T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
- if (sb)
- sb->s_dirt = 1;
-}
struct yaffs_options {
int inband_tags;
return error;
}
+static struct address_space_operations yaffs_file_address_operations = {
+ .readpage = yaffs_readpage,
+ .writepage = yaffs_writepage,
+ .write_begin = yaffs_write_begin,
+ .write_end = yaffs_write_end,
+};
+
+
+
+static const struct inode_operations yaffs_file_inode_operations = {
+ .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+ .setxattr = yaffs_setxattr,
+ .getxattr = yaffs_getxattr,
+ .listxattr = yaffs_listxattr,
+ .removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct inode_operations yaffs_symlink_inode_operations = {
+ .readlink = yaffs_readlink,
+ .follow_link = yaffs_follow_link,
+ .put_link = yaffs_put_link,
+ .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+ .setxattr = yaffs_setxattr,
+ .getxattr = yaffs_getxattr,
+ .listxattr = yaffs_listxattr,
+ .removexattr = yaffs_removexattr,
+#endif
+};
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+ struct yaffs_obj *obj)
+{
+ if (inode && obj) {
+
+ /* Check mode against the variant type and attempt to repair if broken. */
+ u32 mode = obj->yst_mode;
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ if (!S_ISREG(mode)) {
+ obj->yst_mode &= ~S_IFMT;
+ obj->yst_mode |= S_IFREG;
+ }
+
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ if (!S_ISLNK(mode)) {
+ obj->yst_mode &= ~S_IFMT;
+ obj->yst_mode |= S_IFLNK;
+ }
+
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ if (!S_ISDIR(mode)) {
+ obj->yst_mode &= ~S_IFMT;
+ obj->yst_mode |= S_IFDIR;
+ }
+
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ default:
+ /* TODO? */
+ break;
+ }
+
+ inode->i_flags |= S_NOATIME;
+
+ inode->i_ino = obj->obj_id;
+ inode->i_mode = obj->yst_mode;
+ inode->i_uid = obj->yst_uid;
+ inode->i_gid = obj->yst_gid;
+
+ inode->i_rdev = old_decode_dev(obj->yst_rdev);
+
+ inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
+ inode->i_atime.tv_nsec = 0;
+ inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
+ inode->i_mtime.tv_nsec = 0;
+ inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
+ inode->i_ctime.tv_nsec = 0;
+ inode->i_size = yaffs_get_obj_length(obj);
+ inode->i_blocks = (inode->i_size + 511) >> 9;
+
+ inode->i_nlink = yaffs_get_obj_link_count(obj);
+
+ T(YAFFS_TRACE_OS,
+ (TSTR
+ ("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
+ inode->i_mode, inode->i_uid, inode->i_gid,
+ (int)inode->i_size, atomic_read(&inode->i_count)));
+
+ switch (obj->yst_mode & S_IFMT) {
+ default: /* fifo, device or socket */
+ init_special_inode(inode, obj->yst_mode,
+ old_decode_dev(obj->yst_rdev));
+ break;
+ case S_IFREG: /* file */
+ inode->i_op = &yaffs_file_inode_operations;
+ inode->i_fop = &yaffs_file_operations;
+ inode->i_mapping->a_ops =
+ &yaffs_file_address_operations;
+ break;
+ case S_IFDIR: /* directory */
+ inode->i_op = &yaffs_dir_inode_operations;
+ inode->i_fop = &yaffs_dir_operations;
+ break;
+ case S_IFLNK: /* symlink */
+ inode->i_op = &yaffs_symlink_inode_operations;
+ break;
+ }
+
+ yaffs_inode_to_obj_lv(inode) = obj;
+
+ obj->my_inode = inode;
+
+ } else {
+ T(YAFFS_TRACE_OS,
+ (TSTR("yaffs_fill_inode invalid parameters\n")));
+ }
+}
+
+static void yaffs_put_super(struct super_block *sb)
+{
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+ T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
+
+ T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+ (TSTR("Shutting down yaffs background thread\n")));
+ yaffs_bg_stop(dev);
+ T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+ (TSTR("yaffs background thread shut down\n")));
+
+ yaffs_gross_lock(dev);
+
+ yaffs_flush_super(sb, 1);
+
+ if (yaffs_dev_to_lc(dev)->put_super_fn)
+ yaffs_dev_to_lc(dev)->put_super_fn(sb);
+
+ yaffs_deinitialise(dev);
+
+ yaffs_gross_unlock(dev);
+ mutex_lock(&yaffs_context_lock);
+ list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
+ mutex_unlock(&yaffs_context_lock);
+
+ if (yaffs_dev_to_lc(dev)->spare_buffer) {
+ kfree(yaffs_dev_to_lc(dev)->spare_buffer);
+ yaffs_dev_to_lc(dev)->spare_buffer = NULL;
+ }
+
+ kfree(dev);
+}
+
+static void yaffs_mtd_put_super(struct super_block *sb)
+{
+ struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
+
+ if (mtd->sync)
+ mtd->sync(mtd);
+
+ put_mtd_device(mtd);
+}
+
+static const struct super_operations yaffs_super_ops = {
+ .statfs = yaffs_statfs,
+ .put_super = yaffs_put_super,
+ .evict_inode = yaffs_evict_inode,
+ .sync_fs = yaffs_sync_fs,
+ .write_super = yaffs_write_super,
+};
+
static struct super_block *yaffs_internal_read_super(int yaffs_version,
struct super_block *sb,
void *data, int silent)
param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
param->bad_block_fn = nandmtd2_mark_block_bad;
param->query_block_fn = nandmtd2_query_block;
- yaffs_dev_to_lc(dev)->spare_buffer = YMALLOC(mtd->oobsize);
+ yaffs_dev_to_lc(dev)->spare_buffer =
+ kmalloc(mtd->oobsize, GFP_NOFS);
param->is_yaffs2 = 1;
param->total_bytes_per_chunk = mtd->writesize;
param->chunks_per_block = mtd->erasesize / mtd->writesize;