*/
const char *yaffs_fs_c_version =
- "$Id: yaffs_fs.c,v 1.66 2008-05-05 07:58:58 charles Exp $";
+ "$Id: yaffs_fs.c,v 1.71 2009-01-22 00:45:54 charles Exp $";
extern const char *yaffs_guts_c_version;
#include <linux/version.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
-#include <linux/list.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/smp_lock.h>
#endif
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
+#define YPROC_ROOT &proc_root
+#else
+#define YPROC_ROOT NULL
+#endif
+
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
#define WRITE_SIZE_STR "writesize"
#define WRITE_SIZE(mtd) (mtd)->writesize
#define WRITE_SIZE(mtd) (mtd)->oobblock
#endif
+#if(LINUX_VERSION_CODE > KERNEL_VERSION(2,6,27))
+#define YAFFS_USE_WRITE_BEGIN_END 1
+#else
+#define YAFFS_USE_WRITE_BEGIN_END 0
+#endif
+
+
#include <asm/uaccess.h>
#include "yportenv.h"
unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
+unsigned int yaffs_auto_checkpoint = 1;
/* Module Parameters */
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
module_param(yaffs_traceMask,uint,0644);
module_param(yaffs_wr_attempts,uint,0644);
+module_param(yaffs_auto_checkpoint,uint,0644);
#else
MODULE_PARM(yaffs_traceMask,"i");
MODULE_PARM(yaffs_wr_attempts,"i");
+MODULE_PARM(yaffs_auto_checkpoint,"i");
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
+/* use iget and read_inode */
+#define Y_IGET(sb,inum) iget((sb),(inum))
+static void yaffs_read_inode(struct inode *inode);
+
+#else
+/* Call local equivalent */
+#define YAFFS_USE_OWN_IGET
+#define Y_IGET(sb,inum) yaffs_iget((sb),(inum))
+
+static struct inode * yaffs_iget(struct super_block *sb, unsigned long ino);
#endif
/*#define T(x) printk x */
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);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
static int yaffs_file_flush(struct file *file, fl_owner_t id);
#else
static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
#endif
-static void yaffs_read_inode(struct inode *inode);
+#ifdef YAFFS_HAS_PUT_INODE
static void yaffs_put_inode(struct inode *inode);
+#endif
+
static void yaffs_delete_inode(struct inode *);
static void yaffs_clear_inode(struct inode *);
#else
static int yaffs_writepage(struct page *page);
#endif
+
+
+#if (YAFFS_USE_WRITE_BEGIN_END != 0)
+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);
+#else
static int yaffs_prepare_write(struct file *f, struct page *pg,
unsigned offset, unsigned to);
static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
unsigned to);
+
+#endif
static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
int buflen);
static struct address_space_operations yaffs_file_address_operations = {
.readpage = yaffs_readpage,
.writepage = yaffs_writepage,
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+ .write_begin = yaffs_write_begin,
+ .write_end = yaffs_write_end,
+#else
.prepare_write = yaffs_prepare_write,
.commit_write = yaffs_commit_write,
+#endif
};
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,22))
.fsync = yaffs_sync_object,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
+ .llseek = generic_file_llseek,
};
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
static struct super_operations yaffs_super_ops = {
.statfs = yaffs_statfs,
+
+#ifndef YAFFS_USE_OWN_IGET
.read_inode = yaffs_read_inode,
+#endif
+#ifdef YAFFS_HAS_PUT_INODE
.put_inode = yaffs_put_inode,
+#endif
.put_super = yaffs_put_super,
.delete_inode = yaffs_delete_inode,
.clear_inode = yaffs_clear_inode,
}
+
+#ifdef YAFFS_HAS_PUT_INODE
+
/* For now put inode is just for debugging
* Put inode is called when the inode **structure** is put.
*/
atomic_read(&inode->i_count)));
}
+#endif
/* clear is called to tell the fs to release any per-inode data it holds */
static void yaffs_clear_inode(struct inode *inode)
return (nWritten == nBytes) ? 0 : -ENOSPC;
}
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+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;
+ uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
+ uint32_t to = offset + len;
+
+ int ret = 0;
+ int space_held = 0;
+
+ T(YAFFS_TRACE_OS, (KERN_DEBUG "start yaffs_write_begin\n"));
+ /* Get a page */
+ pg = __grab_cache_page(mapping,index);
+ *pagep = pg;
+ if(!pg){
+ ret = -ENOMEM;
+ goto out;
+ }
+ /* Get fs space */
+ space_held = yaffs_hold_space(filp);
+
+ if(!space_held){
+ ret = -ENOSPC;
+ goto out;
+ }
+
+ /* Update page if required */
+
+ if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
+ ret = yaffs_readpage_nolock(filp, pg);
+
+ if(ret)
+ goto out;
+
+ /* Happy path return */
+ T(YAFFS_TRACE_OS, (KERN_DEBUG "end yaffs_write_begin - ok\n"));
+
+ return 0;
+
+out:
+ T(YAFFS_TRACE_OS, (KERN_DEBUG "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;
+}
+
+#else
+
static int yaffs_prepare_write(struct file *f, struct page *pg,
unsigned offset, unsigned to)
{
T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
return yaffs_readpage_nolock(f, pg);
-
return 0;
}
+#endif
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+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;
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE -1);
+
+
+
+ kva=kmap(pg);
+ addr = kva + offset_into_page;
+
+ T(YAFFS_TRACE_OS,
+ (KERN_DEBUG "yaffs_write_end addr %x pos %x nBytes %d\n", (unsigned) addr,
+ (int)pos, copied));
+
+ ret = yaffs_file_write(filp, addr, copied, &pos);
+
+ if (ret != copied) {
+ T(YAFFS_TRACE_OS,
+ (KERN_DEBUG
+ "yaffs_write_end not same size ret %d copied %d\n",
+ ret, copied ));
+ SetPageError(pg);
+ ClearPageUptodate(pg);
+ } else {
+ SetPageUptodate(pg);
+ }
+
+ kunmap(pg);
+
+ yaffs_release_space(filp);
+ unlock_page(pg);
+ page_cache_release(pg);
+ return ret;
+}
+#else
static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
unsigned to)
{
- void *addr = page_address(pg) + offset;
+ void *addr, *kva;
+
loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
int nBytes = to - offset;
int nWritten;
unsigned spos = pos;
- unsigned saddr = (unsigned)addr;
+ unsigned saddr;
+
+ kva=kmap(pg);
+ addr = kva + offset;
+
+ saddr = (unsigned) addr;
T(YAFFS_TRACE_OS,
(KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
SetPageUptodate(pg);
}
+ kunmap(pg);
+
T(YAFFS_TRACE_OS,
(KERN_DEBUG "yaffs_commit_write returning %d\n",
nWritten == nBytes ? 0 : nWritten));
return nWritten == nBytes ? 0 : nWritten;
}
+#endif
+
static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
{
T(YAFFS_TRACE_OS,
(KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
- inode = iget(sb, obj->objectId);
+ inode = Y_IGET(sb, obj->objectId);
+ if(IS_ERR(inode))
+ return NULL;
/* NB Side effect: iget calls back to yaffs_read_inode(). */
/* iget also increments the inode's i_count */
return nWritten == 0 ? -ENOSPC : nWritten;
}
+/* 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_Object *obj;
+ yaffs_Device *dev;
+
+ int nFreeChunks;
+
+
+ obj = yaffs_DentryToObject(f->f_dentry);
+
+ dev = obj->myDev;
+
+ yaffs_GrossLock(dev);
+
+ nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
+
+ yaffs_GrossUnlock(dev);
+
+ return (nFreeChunks > 20) ? 1 : 0;
+}
+
+static void yaffs_release_space(struct file *f)
+{
+ yaffs_Object *obj;
+ yaffs_Device *dev;
+
+
+ obj = yaffs_DentryToObject(f->f_dentry);
+
+ dev = obj->myDev;
+
+ yaffs_GrossLock(dev);
+
+
+ yaffs_GrossUnlock(dev);
+
+}
+
static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
{
yaffs_Object *obj;
yaffs_Device *dev;
struct inode *inode = f->f_dentry->d_inode;
unsigned long offset, curoffs;
- struct list_head *i;
+ struct ylist_head *i;
yaffs_Object *l;
char name[YAFFS_MAX_NAME_LENGTH + 1];
f->f_version = inode->i_version;
}
- list_for_each(i, &obj->variant.directoryVariant.children) {
+ ylist_for_each(i, &obj->variant.directoryVariant.children) {
curoffs++;
if (curoffs >= offset) {
- l = list_entry(i, yaffs_Object, siblings);
+ l = ylist_entry(i, yaffs_Object, siblings);
yaffs_GetObjectName(l, name,
YAFFS_MAX_NAME_LENGTH + 1);
if (target &&
target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
- !list_empty(&target->variant.directoryVariant.children)) {
+ !ylist_empty(&target->variant.directoryVariant.children)) {
T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
}
-/**
static int yaffs_do_sync_fs(struct super_block *sb)
{
if(sb->s_dirt) {
yaffs_GrossLock(dev);
- if(dev)
+ if(dev){
+ yaffs_FlushEntireDeviceCache(dev);
yaffs_CheckpointSave(dev);
+ }
yaffs_GrossUnlock(dev);
}
return 0;
}
-**/
+
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
static void yaffs_write_super(struct super_block *sb)
{
T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
+ if (yaffs_auto_checkpoint >= 2)
+ yaffs_do_sync_fs(sb);
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
- return 0; /* yaffs_do_sync_fs(sb);*/
+ return 0;
#endif
}
T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
- return 0; /* yaffs_do_sync_fs(sb);*/
+ if (yaffs_auto_checkpoint >= 1)
+ yaffs_do_sync_fs(sb);
+
+ return 0;
+
+}
+
+#ifdef YAFFS_USE_OWN_IGET
+
+static struct inode * yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+ struct inode *inode;
+ yaffs_Object *obj;
+ yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+ T(YAFFS_TRACE_OS,
+ (KERN_DEBUG "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_GrossLock(dev);
+
+ obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
+
+ yaffs_FillInodeFromObject(inode, obj);
+ yaffs_GrossUnlock(dev);
+
+ unlock_new_inode(inode);
+ return inode;
}
+#else
static void yaffs_read_inode(struct inode *inode)
{
yaffs_GrossUnlock(dev);
}
-static LIST_HEAD(yaffs_dev_list);
+#endif
+
+static YLIST_HEAD(yaffs_dev_list);
#if 0 // not used
static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
yaffs_GrossUnlock(dev);
/* we assume this is protected by lock_kernel() in mount/umount */
- list_del(&dev->devList);
+ ylist_del(&dev->devList);
if(dev->spareBuffer){
YFREE(dev->spareBuffer);
struct super_block *sb = (struct super_block *)vsb;
T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
-// if(sb)
-// sb->s_dirt = 1;
+ if(sb)
+ sb->s_dirt = 1;
}
typedef struct {
dev->skipCheckpointWrite = options.skip_checkpoint_write;
/* we assume this is protected by lock_kernel() in mount/umount */
- list_add_tail(&dev->devList, &yaffs_dev_list);
+ ylist_add_tail(&dev->devList, &yaffs_dev_list);
init_MUTEX(&dev->grossLock);
return NULL;
}
sb->s_root = root;
+ sb->s_dirt = !dev->isCheckpointed;
+ T(YAFFS_TRACE_ALWAYS,
+ ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
return sb;
char **start,
off_t offset, int count, int *eof, void *data)
{
- struct list_head *item;
+ struct ylist_head *item;
char *buf = page;
int step = offset;
int n = 0;
lock_kernel();
/* Locate and print the Nth entry. Order N-squared but N is small. */
- list_for_each(item, &yaffs_dev_list) {
- yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
+ ylist_for_each(item, &yaffs_dev_list) {
+ yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
if (n < step) {
n++;
continue;
/* Install the proc_fs entry */
my_proc_entry = create_proc_entry("yaffs",
S_IRUGO | S_IFREG,
- &proc_root);
+ YPROC_ROOT);
if (my_proc_entry) {
my_proc_entry->write_proc = yaffs_proc_write;
T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
" removing. \n"));
- remove_proc_entry("yaffs", &proc_root);
+ remove_proc_entry("yaffs", YPROC_ROOT);
fsinst = fs_to_install;