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| author | Christoph Hellwig <hch@lst.de> | 2010-06-09 15:31:01 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-06-11 12:58:08 +0200 |
| commit | 29cb48594b873f6193d6327097e504bd3e2314de (patch) | |
| tree | 1c93364fd70d93d42c6749c261f96f84a66d71e2 | |
| parent | 334132ae921a14ac2b2ba48e174136f7f2c9aae1 (diff) | |
| download | linux-3.10-29cb48594b873f6193d6327097e504bd3e2314de.tar.gz linux-3.10-29cb48594b873f6193d6327097e504bd3e2314de.tar.bz2 linux-3.10-29cb48594b873f6193d6327097e504bd3e2314de.zip | |
writeback: fix pin_sb_for_writeback
We need to check for s_instances to make sure we don't bother working
against a filesystem that is beeing unmounted, and we need to call
put_super to make sure a superblock is freed when we race against
umount. Also no need to keep sb_lock after we got a reference on it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| -rw-r--r-- | fs/fs-writeback.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 3a066e91ec8..0609607d395 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -534,19 +534,21 @@ select_queue: static bool pin_sb_for_writeback(struct super_block *sb) { spin_lock(&sb_lock); + if (list_empty(&sb->s_instances)) { + spin_unlock(&sb_lock); + return false; + } + sb->s_count++; + spin_unlock(&sb_lock); + if (down_read_trylock(&sb->s_umount)) { - if (sb->s_root) { - spin_unlock(&sb_lock); + if (sb->s_root) return true; - } - /* - * umounted, drop rwsem again and fall through to failure - */ up_read(&sb->s_umount); } - sb->s_count--; - spin_unlock(&sb_lock); + + put_super(sb); return false; } |