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-rw-r--r--fs/ubifs/file.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 0ff89fe71e5..6d34dc7e33e 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -430,6 +430,7 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
struct ubifs_inode *ui = ubifs_inode(inode);
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
int uninitialized_var(err), appending = !!(pos + len > inode->i_size);
+ int skipped_read = 0;
struct page *page;
ubifs_assert(ubifs_inode(inode)->ui_size == inode->i_size);
@@ -444,7 +445,7 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
if (!PageUptodate(page)) {
/* The page is not loaded from the flash */
- if (!(pos & ~PAGE_CACHE_MASK) && len == PAGE_CACHE_SIZE)
+ if (!(pos & ~PAGE_CACHE_MASK) && len == PAGE_CACHE_SIZE) {
/*
* We change whole page so no need to load it. But we
* have to set the @PG_checked flag to make the further
@@ -453,7 +454,8 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
* the media.
*/
SetPageChecked(page);
- else {
+ skipped_read = 1;
+ } else {
err = do_readpage(page);
if (err) {
unlock_page(page);
@@ -470,6 +472,14 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
if (unlikely(err)) {
ubifs_assert(err == -ENOSPC);
/*
+ * If we skipped reading the page because we were going to
+ * write all of it, then it is not up to date.
+ */
+ if (skipped_read) {
+ ClearPageChecked(page);
+ ClearPageUptodate(page);
+ }
+ /*
* Budgeting failed which means it would have to force
* write-back but didn't, because we set the @fast flag in the
* request. Write-back cannot be done now, while we have the
@@ -949,7 +959,7 @@ static int do_writepage(struct page *page, int len)
* whole index and correct all inode sizes, which is long an unacceptable.
*
* To prevent situations like this, UBIFS writes pages back only if they are
- * within last synchronized inode size, i.e. the the size which has been
+ * within the last synchronized inode size, i.e. the size which has been
* written to the flash media last time. Otherwise, UBIFS forces inode
* write-back, thus making sure the on-flash inode contains current inode size,
* and then keeps writing pages back.