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| author | Namjae Jeon <namjae.jeon@samsung.com> | 2014-05-12 08:12:25 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-05-12 08:12:25 -0400 |
| commit | 1c8349a17137b93f0a83f276c764a6df1b9a116e (patch) | |
| tree | 27a59d4a8ba3ce8cf426a3c55b07d259eb356598 /fs/ext4/page-io.c | |
| parent | 236f5ecb4a5876977837376729a7599cc1ab2cc3 (diff) | |
| download | linux-1c8349a17137b93f0a83f276c764a6df1b9a116e.tar.bz2 | |
ext4: fix data integrity sync in ordered mode
When we perform a data integrity sync we tag all the dirty pages with
PAGECACHE_TAG_TOWRITE at start of ext4_da_writepages. Later we check
for this tag in write_cache_pages_da and creates a struct
mpage_da_data containing contiguously indexed pages tagged with this
tag and sync these pages with a call to mpage_da_map_and_submit. This
process is done in while loop until all the PAGECACHE_TAG_TOWRITE
pages are synced. We also do journal start and stop in each iteration.
journal_stop could initiate journal commit which would call
ext4_writepage which in turn will call ext4_bio_write_page even for
delayed OR unwritten buffers. When ext4_bio_write_page is called for
such buffers, even though it does not sync them but it clears the
PAGECACHE_TAG_TOWRITE of the corresponding page and hence these pages
are also not synced by the currently running data integrity sync. We
will end up with dirty pages although sync is completed.
This could cause a potential data loss when the sync call is followed
by a truncate_pagecache call, which is exactly the case in
collapse_range. (It will cause generic/127 failure in xfstests)
To avoid this issue, we can use set_page_writeback_keepwrite instead of
set_page_writeback, which doesn't clear TOWRITE tag.
Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4/page-io.c')
| -rw-r--r-- | fs/ext4/page-io.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index c18d95b50540..4cb2743cb2e3 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -401,7 +401,8 @@ submit_and_retry: int ext4_bio_write_page(struct ext4_io_submit *io, struct page *page, int len, - struct writeback_control *wbc) + struct writeback_control *wbc, + bool keep_towrite) { struct inode *inode = page->mapping->host; unsigned block_start, blocksize; @@ -414,7 +415,10 @@ int ext4_bio_write_page(struct ext4_io_submit *io, BUG_ON(!PageLocked(page)); BUG_ON(PageWriteback(page)); - set_page_writeback(page); + if (keep_towrite) + set_page_writeback_keepwrite(page); + else + set_page_writeback(page); ClearPageError(page); /* |