diff mbox

[2/7] f2fs: avoid writing 0'th page in volatile writes

Message ID 1461629220-16280-2-git-send-email-jaegeuk@kernel.org (mailing list archive)
State New, archived
Headers show

Commit Message

Jaegeuk Kim April 26, 2016, 12:06 a.m. UTC 
The first page of volatile writes usually contains a sort of header information
which will be used for recovery.
(e.g., journal header of sqlite)

If this is written without other journal data, user needs to handle the stale
journal information.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/data.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index c29bcf4..e54489b 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1177,8 +1177,10 @@  write:
 		goto redirty_out;
 	if (f2fs_is_drop_cache(inode))
 		goto out;
-	if (f2fs_is_volatile_file(inode) && !wbc->for_reclaim &&
-			available_free_memory(sbi, BASE_CHECK))
+	/* we should not write 0'th page having journal header */
+	if (f2fs_is_volatile_file(inode) && (!page->index ||
+			(!wbc->for_reclaim &&
+			available_free_memory(sbi, BASE_CHECK))))
 		goto redirty_out;
 
 	/* Dentry blocks are controlled by checkpoint */