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| author | Chris Mason <chris.mason@oracle.com> | 2008-06-26 10:34:20 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:04 -0400 |
| commit | a7a16fd772620605c76e8ac8bdbc8ccc9e3df1a0 (patch) | |
| tree | 5dc173d7653ba4819ce1c853b9e84293422edf90 /fs/btrfs/root-tree.c | |
| parent | f9efa9c784aa3b801feb367f72c6867d26fb348e (diff) | |
| download | lwn-a7a16fd772620605c76e8ac8bdbc8ccc9e3df1a0.tar.gz lwn-a7a16fd772620605c76e8ac8bdbc8ccc9e3df1a0.zip | |
Btrfs: Fix deadlock while searching for dead roots on mount
btrfs_find_dead_roots called btrfs_read_fs_root_no_radix, which
means we end up calling btrfs_search_slot with a path already held.
The fix is to remember the key inside btrfs_find_dead_roots and drop
the path.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/root-tree.c')
| -rw-r--r-- | fs/btrfs/root-tree.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 8bf21ba0a43b..a5c0e98b5aeb 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -154,6 +154,7 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid, struct btrfs_item *item; struct btrfs_root_item *ri; struct btrfs_key key; + struct btrfs_key found_key; struct btrfs_path *path; int ret; u32 nritems; @@ -166,6 +167,8 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid, path = btrfs_alloc_path(); if (!path) return -ENOMEM; + +again: ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto err; @@ -196,7 +199,11 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid, if (btrfs_disk_root_refs(leaf, ri) != 0) goto next; - dead_root = btrfs_read_fs_root_no_radix(root->fs_info, &key); + memcpy(&found_key, &key, sizeof(key)); + key.offset++; + btrfs_release_path(root, path); + dead_root = btrfs_read_fs_root_no_radix(root->fs_info, + &found_key); if (IS_ERR(dead_root)) { ret = PTR_ERR(dead_root); goto err; @@ -206,6 +213,7 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid, &root->fs_info->dead_roots); if (ret) goto err; + goto again; next: slot++; path->slots[0]++; |