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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 <josef@redhat.com>
This commit is contained in:
Josef Bacik 2011-01-31 16:22:42 -05:00
parent 3893e33b0b
commit 66b4ffd110
6 changed files with 50 additions and 23 deletions
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2
fs/btrfs/ctree.h
View File

@ -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);

15
fs/btrfs/disk-io.c
View File

@ -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++;
}

3
fs/btrfs/extent-tree.c
View File

@ -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;
}

47
fs/btrfs/inode.c
View File

@ -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;

4
fs/btrfs/ioctl.c
View File

@ -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);

2
fs/btrfs/relocation.c
View File

@ -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;
}