*/
const char *yaffs_fs_c_version =
- "$Id: yaffs_fs.c,v 1.68 2008-07-23 03:35:12 charles Exp $";
+ "$Id: yaffs_fs.c,v 1.72 2009-02-04 21:40:27 charles Exp $";
extern const char *yaffs_guts_c_version;
#include <linux/version.h>
#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))
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_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))
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;
+ 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)
{
} else {
T(YAFFS_TRACE_OS,
(KERN_DEBUG
- "yaffs_file_write about to write writing %d bytes"
+ "yaffs_file_write about to write writing %zu bytes"
"to object %d at %d\n",
n, obj->objectId, ipos));
}
nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
T(YAFFS_TRACE_OS,
- (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
+ (KERN_DEBUG "yaffs_file_write writing %zu bytes, %d written at %d\n",
n, nWritten, ipos));
if (nWritten > 0) {
ipos += nWritten;
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;
{
T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
- yaffs_do_sync_fs(sb);
+ if (yaffs_auto_checkpoint >= 2)
+ yaffs_do_sync_fs(sb);
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
return 0;
#endif
T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
- yaffs_do_sync_fs(sb);
+ if (yaffs_auto_checkpoint >= 1)
+ yaffs_do_sync_fs(sb);
return 0;
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 {
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;