From: Ian Kent Date: Mon, 22 Nov 2010 02:21:38 +0000 (+0000) Subject: Btrfs - fix race between btrfs_get_sb() and umount X-Git-Tag: upstream/snapshot3+hdmi~11282^2~77 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=619c8c763928841b1112e1d417f88bc1d44daecb;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git Btrfs - fix race between btrfs_get_sb() and umount When mounting a btrfs file system btrfs_test_super() may attempt to use sb->s_fs_info, the btrfs root, of a super block that is going away and that has had the btrfs root set to NULL in its ->put_super(). But if the super block is going away it cannot be an existing super block so we can return false in this case. Signed-off-by: Ian Kent Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 66e4612..141fb31 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -566,6 +566,12 @@ static int btrfs_test_super(struct super_block *s, void *data) struct btrfs_fs_devices *test_fs_devices = 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_fs_devices; }