diff options
| author | Salman Qazi <sqazi@google.com> | 2012-05-31 23:52:14 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-10 00:33:04 +0900 |
| commit | 32e090b1f4bdfe9756e1b8f0b5280acb036d1c61 (patch) | |
| tree | 08ae90466ca26a7e722623fad696f43feb5b2a6c /include | |
| parent | 97434cf53353728708c133af183a11a158c8c26a (diff) | |
ext4: remove mb_groups before tearing down the buddy_cache
commit 95599968d19db175829fb580baa6b68939b320fb upstream.
We can't have references held on pages in the s_buddy_cache while we are
trying to truncate its pages and put the inode. All the pages must be
gone before we reach clear_inode. This can only be gauranteed if we
can prevent new users from grabbing references to s_buddy_cache's pages.
The original bug can be reproduced and the bug fix can be verified by:
while true; do mount -t ext4 /dev/ram0 /export/hda3/ram0; \
umount /export/hda3/ram0; done &
while true; do cat /proc/fs/ext4/ram0/mb_groups; done
Signed-off-by: Salman Qazi <sqazi@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions