From ea9e8b11bd1252dcbc23afefcf1a52ec6aa3c113 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Mon, 17 Nov 2008 21:14:24 -0500 Subject: Btrfs: prevent loops in the directory tree when creating snapshots For a directory tree: /mnt/subvolA/subvolB btrfsctl -s /mnt/subvolA/subvolB /mnt Will create a directory loop with subvolA under subvolB. This commit uses the forward refs for each subvol and snapshot to error out before creating the loop. Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'fs/btrfs/disk-io.c') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 8d7866b733d6..e18250a6fd2d 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1129,7 +1129,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, kfree(root); return ERR_PTR(ret); } - +#if 0 ret = btrfs_sysfs_add_root(root); if (ret) { free_extent_buffer(root->node); @@ -1137,6 +1137,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, kfree(root); return ERR_PTR(ret); } +#endif root->in_sysfs = 1; return root; } @@ -1963,8 +1964,10 @@ int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) down_write(&root->anon_super.s_umount); kill_anon_super(&root->anon_super); } +#if 0 if (root->in_sysfs) btrfs_sysfs_del_root(root); +#endif if (root->node) free_extent_buffer(root->node); if (root->commit_root) -- cgit v1.2.3