| commit | 592b09a42fc3ae6737a0f3ecf4fee42ecd0296f8 | |
| author | Jens Axboe <jens.axboe@oracle.com> | |
| Thu, 29 Oct 2009 10:46:12 +0000 (29 11:46 +0100) | ||
| committer | Jens Axboe <jens.axboe@oracle.com> | |
| Thu, 29 Oct 2009 10:46:12 +0000 (29 11:46 +0100) | ||
| tree | d06ca7165c5dfc5224910993b36a50e54a896831 | treesnapshot (tar.gz zip) |
| parent | 960cc0f4fef607baabc2232fbd7cce5368a9dcfd | commitdiff |
backing-dev: ensure that a removed bdi no longer has super_block referencing it
When the bdi is being removed, we have to ensure that no super_blocks
currently have that cached in sb->s_bdi. Normally this is ensured by
the sb having a longer life span than the bdi, but if the device is
suddenly yanked, we have to kill this reference. sb->s_bdi is pointed
to freed memory at that point.
This fixes a problem with sync(1) hanging when a USB stick is pulled
without cleanly umounting it first.
Reported-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
When the bdi is being removed, we have to ensure that no super_blocks
currently have that cached in sb->s_bdi. Normally this is ensured by
the sb having a longer life span than the bdi, but if the device is
suddenly yanked, we have to kill this reference. sb->s_bdi is pointed
to freed memory at that point.
This fixes a problem with sync(1) hanging when a USB stick is pulled
without cleanly umounting it first.
Reported-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| mm/backing-dev.c | diffblobblamehistory |