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| author | Markus Trippelsdorf <markus@trippelsdorf.de> | 2010-11-18 03:46:06 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-11-18 03:46:06 +0100 |
| commit | 08da1193d2c8c7a25d0cef7f85d0b9f1ad7c583a (patch) | |
| tree | 5a288945b73bc0ea79ca26e556f8061b51a85c1d /fs | |
| parent | Linux 2.6.37-rc2 (diff) | |
| download | linux-08da1193d2c8c7a25d0cef7f85d0b9f1ad7c583a.tar.xz linux-08da1193d2c8c7a25d0cef7f85d0b9f1ad7c583a.zip | |
ext4: fix setting random pages PageUptodate
ext4_end_bio calls put_page and kmem_cache_free before calling
SetPageUpdate(). This can result in setting the PageUptodate bit on
random pages and causes the following BUG:
BUG: Bad page state in process rm pfn:52e54
page:ffffea0001222260 count:0 mapcount:0 mapping: (null) index:0x0
arch kernel: page flags: 0x4000000000000008(uptodate)
Fix the problem by moving put_io_page() after the SetPageUpdate() call.
Thanks to Hugh Dickins for analyzing this problem.
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Tested-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/page-io.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index 7f5451cd1d38..beacce11ac50 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -237,8 +237,6 @@ static void ext4_end_bio(struct bio *bio, int error) } while (bh != head); } - put_io_page(io_end->pages[i]); - /* * If this is a partial write which happened to make * all buffers uptodate then we can optimize away a @@ -248,6 +246,8 @@ static void ext4_end_bio(struct bio *bio, int error) */ if (!partial_write) SetPageUptodate(page); + + put_io_page(io_end->pages[i]); } io_end->num_io_pages = 0; inode = io_end->inode; |