From 66b4ffd110f9b48b8d8c1319ee446b53b8d073bf Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 31 Jan 2011 16:22:42 -0500 Subject: [PATCH] Btrfs: handle errors in btrfs_orphan_cleanup If we cannot truncate an inode for some reason we will never delete the orphan item associated with that inode, which means that we will loop forever in btrfs_orphan_cleanup. Instead of doing this just return error so we fail to mount. It sucks, but hey it's better than hanging. Thanks, Signed-off-by: Josef Bacik --- fs/btrfs/ctree.h | 2 +- fs/btrfs/disk-io.c | 15 +++++++++++--- fs/btrfs/extent-tree.c | 3 ++- fs/btrfs/inode.c | 47 ++++++++++++++++++++++++++++-------------- fs/btrfs/ioctl.c | 4 +++- fs/btrfs/relocation.c | 2 +- 6 files changed, 50 insertions(+), 23 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 34142d5647df..841330f3d68d 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2529,7 +2529,7 @@ int btrfs_update_inode(struct btrfs_trans_handle *trans, struct inode *inode); int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode); -void btrfs_orphan_cleanup(struct btrfs_root *root); +int btrfs_orphan_cleanup(struct btrfs_root *root); void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans, struct btrfs_pending_snapshot *pending, u64 *bytes_to_reserve); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index e1aa8d607bc7..495b1ac45f8c 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2058,9 +2058,14 @@ struct btrfs_root *open_ctree(struct super_block *sb, if (!(sb->s_flags & MS_RDONLY)) { down_read(&fs_info->cleanup_work_sem); - btrfs_orphan_cleanup(fs_info->fs_root); - btrfs_orphan_cleanup(fs_info->tree_root); + err = btrfs_orphan_cleanup(fs_info->fs_root); + if (!err) + err = btrfs_orphan_cleanup(fs_info->tree_root); up_read(&fs_info->cleanup_work_sem); + if (err) { + close_ctree(tree_root); + return ERR_PTR(err); + } } return tree_root; @@ -2435,8 +2440,12 @@ int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) root_objectid = gang[ret - 1]->root_key.objectid + 1; for (i = 0; i < ret; i++) { + int err; + root_objectid = gang[i]->root_key.objectid; - btrfs_orphan_cleanup(gang[i]); + err = btrfs_orphan_cleanup(gang[i]); + if (err) + return err; } root_objectid++; } diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 27376c97d85f..a8f4e8d2ba60 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7619,7 +7619,8 @@ int btrfs_cleanup_reloc_trees(struct btrfs_root *root) reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); BUG_ON(!reloc_root); - btrfs_orphan_cleanup(reloc_root); + ret = btrfs_orphan_cleanup(reloc_root); + BUG_ON(ret); return 0; } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index d83025063ee7..0600265cb9b0 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2284,7 +2284,7 @@ int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) * this cleans up any orphans that may be left on the list from the last use * of this root. */ -void btrfs_orphan_cleanup(struct btrfs_root *root) +int btrfs_orphan_cleanup(struct btrfs_root *root) { struct btrfs_path *path; struct extent_buffer *leaf; @@ -2294,10 +2294,13 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) int ret = 0, nr_unlink = 0, nr_truncate = 0; if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) - return; + return 0; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) { + ret = -ENOMEM; + goto out; + } path->reada = -1; key.objectid = BTRFS_ORPHAN_OBJECTID; @@ -2306,11 +2309,8 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) while (1) { ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); - if (ret < 0) { - printk(KERN_ERR "Error searching slot for orphan: %d" - "\n", ret); - break; - } + if (ret < 0) + goto out; /* * if ret == 0 means we found what we were searching for, which @@ -2318,6 +2318,7 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) * find the key and see if we have stuff that matches */ if (ret > 0) { + ret = 0; if (path->slots[0] == 0) break; path->slots[0]--; @@ -2345,7 +2346,10 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) found_key.type = BTRFS_INODE_ITEM_KEY; found_key.offset = 0; inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); - BUG_ON(IS_ERR(inode)); + if (IS_ERR(inode)) { + ret = PTR_ERR(inode); + goto out; + } /* * add this inode to the orphan list so btrfs_orphan_del does @@ -2363,7 +2367,10 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) */ if (is_bad_inode(inode)) { trans = btrfs_start_transaction(root, 0); - BUG_ON(IS_ERR(trans)); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } btrfs_orphan_del(trans, inode); btrfs_end_transaction(trans, root); iput(inode); @@ -2378,16 +2385,16 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) continue; } nr_truncate++; - btrfs_truncate(inode); + ret = btrfs_truncate(inode); } else { nr_unlink++; } /* this will do delete_inode and everything for us */ iput(inode); + if (ret) + goto out; } - btrfs_free_path(path); - root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; if (root->orphan_block_rsv) @@ -2396,14 +2403,20 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) if (root->orphan_block_rsv || root->orphan_item_inserted) { trans = btrfs_join_transaction(root, 1); - BUG_ON(IS_ERR(trans)); - btrfs_end_transaction(trans, root); + if (!IS_ERR(trans)) + btrfs_end_transaction(trans, root); } if (nr_unlink) printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); if (nr_truncate) printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); + +out: + if (ret) + printk(KERN_CRIT "btrfs: could not do orphan cleanup %d\n", ret); + btrfs_free_path(path); + return ret; } /* @@ -4156,8 +4169,10 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) if (!IS_ERR(inode) && root != sub_root) { down_read(&root->fs_info->cleanup_work_sem); if (!(inode->i_sb->s_flags & MS_RDONLY)) - btrfs_orphan_cleanup(sub_root); + ret = btrfs_orphan_cleanup(sub_root); up_read(&root->fs_info->cleanup_work_sem); + if (ret) + inode = ERR_PTR(ret); } return inode; diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 5fdb2abc4fa7..ad9b8c0e930b 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -409,7 +409,9 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, if (ret) goto fail; - btrfs_orphan_cleanup(pending_snapshot->snap); + ret = btrfs_orphan_cleanup(pending_snapshot->snap); + if (ret) + goto fail; parent = dget_parent(dentry); inode = btrfs_lookup_dentry(parent->d_inode, dentry); diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 31ade5802ae8..c863c8447015 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -4209,7 +4209,7 @@ out: if (IS_ERR(fs_root)) err = PTR_ERR(fs_root); else - btrfs_orphan_cleanup(fs_root); + err = btrfs_orphan_cleanup(fs_root); } return err; } -- 2.30.2