Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6

* 'linux-next' of git://git.infradead.org/ubifs-2.6:
  UBIFS: fix recovery bug
  UBIFS: add R/O compatibility
  UBIFS: fix compiler warnings
  UBIFS: fully sort GCed nodes
  UBIFS: fix commentaries
  UBIFS: introduce a helpful variable
  UBIFS: use KERN_CONT
  UBIFS: fix lprops committing bug
  UBIFS: fix bogus assertion
  UBIFS: fix bug where page is marked uptodate when out of space
  UBIFS: amend key_hash return value
  UBIFS: improve find function interface
  UBIFS: list usage cleanup
  UBIFS: fix dbg_chk_lpt_sz()

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.