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btrfs: fix mount/umount race 

Do *NOT* skip doomed superblocks in btrfs_test_super(); we want
sget() to wait for their shutdown to complete.  Since we don't
mutilate ->s_fs_info in ->put_super() anymore (or free what it
used to point to until the superblock is past being findable
by sget()), we can just DTRT there and report a match.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-17 01:29:09 -05:00
parent aea52e19dd
commit 6de1d09d96
1 changed files with 4 additions and 9 deletions
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13
fs/btrfs/super.c
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@ -733,20 +733,15 @@ static int btrfs_test_super(struct super_block *s, void *data)
struct btrfs_root *test_root = data;
struct btrfs_root *root = btrfs_sb(s);
/*
* If this super block is going away, return false as it
* can't match as an existing super block.
*/
if (!atomic_read(&s->s_active))
return 0;
return root->fs_info->fs_devices == test_root->fs_info->fs_devices;
}
static int btrfs_set_super(struct super_block *s, void *data)
{
s->s_fs_info = data;
return set_anon_super(s, data);
int err = set_anon_super(s, data);
if (!err)
s->s_fs_info = data;
return err;
}
/*