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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-29 09:17:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-29 09:17:19 -0700 |
| commit | 68e71d1902a820c9bc7a5a6c23260841caafff33 (patch) | |
| tree | a9ba52bdfef99e7bdc5f8623772d76789f7b7c8b /mm | |
| parent | 066455d471e997adbcc98dda62eaf461e8b6556e (diff) | |
| parent | 592b09a42fc3ae6737a0f3ecf4fee42ecd0296f8 (diff) | |
| download | linux-stable-68e71d1902a820c9bc7a5a6c23260841caafff33.tar.gz linux-stable-68e71d1902a820c9bc7a5a6c23260841caafff33.tar.bz2 linux-stable-68e71d1902a820c9bc7a5a6c23260841caafff33.zip | |
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
backing-dev: ensure that a removed bdi no longer has super_block referencing it
block: use after free bug in __blkdev_get
block: silently error unsupported empty barriers too
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/backing-dev.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 5a37e2055717..1065b715ef64 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -610,6 +610,21 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi) kthread_stop(wb->task); } +/* + * This bdi is going away now, make sure that no super_blocks point to it + */ +static void bdi_prune_sb(struct backing_dev_info *bdi) +{ + struct super_block *sb; + + spin_lock(&sb_lock); + list_for_each_entry(sb, &super_blocks, s_list) { + if (sb->s_bdi == bdi) + sb->s_bdi = NULL; + } + spin_unlock(&sb_lock); +} + void bdi_unregister(struct backing_dev_info *bdi) { if (bdi->dev) { @@ -682,6 +697,7 @@ void bdi_destroy(struct backing_dev_info *bdi) spin_unlock(&inode_lock); } + bdi_prune_sb(bdi); bdi_unregister(bdi); for (i = 0; i < NR_BDI_STAT_ITEMS; i++) |