Clean up btrfs_lookup_dentry() to never return NULL, but PTR_ERR(-ENOENT) instead. This keeps the return value convention consistent. Callers who use btrfs_lookup_dentry() require a trivial update. create_snapshot() in particular looks like it can also lose a BUG_ON(!inode) which is not really needed - there seems less harm in returning ENOENT to userspace at that point in the stack than there is to crash the machine. Signed-off-by: Tsutomu Itoh <t-itoh@xxxxxxxxxxxxxx> --- fs/btrfs/inode.c | 15 +++++++++++---- fs/btrfs/ioctl.c | 13 ++++++++++--- 2 files changed, 21 insertions(+), 7 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 3b4ffaf..f9b45a7 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4910,7 +4910,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) return ERR_PTR(ret); if (location.objectid == 0) - return NULL; + return ERR_PTR(-ENOENT); if (location.type == BTRFS_INODE_ITEM_KEY) { inode = btrfs_iget(dir->i_sb, &location, root, NULL); @@ -4974,10 +4974,17 @@ static void btrfs_dentry_release(struct dentry *dentry) static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { - struct dentry *ret; + struct inode *inode; - ret = d_splice_alias(btrfs_lookup_dentry(dir, dentry), dentry); - return ret; + inode = btrfs_lookup_dentry(dir, dentry); + if (IS_ERR(inode)) { + if (PTR_ERR(inode) == -ENOENT) + inode = NULL; + else + return ERR_CAST(inode); + } + + return d_splice_alias(inode, dentry); } unsigned char btrfs_filetype_table[] = { diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 9d46f60..716779c 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -389,6 +389,7 @@ static noinline int create_subvol(struct inode *dir, struct btrfs_root *new_root; struct btrfs_block_rsv block_rsv; struct timespec cur_time = CURRENT_TIME; + struct inode *inode; int ret; int err; u64 objectid; @@ -550,8 +551,14 @@ fail: if (err && !ret) ret = err; - if (!ret) - d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); + if (!ret) { + inode = btrfs_lookup_dentry(dir, dentry); + if (IS_ERR(inode)) { + ret = PTR_ERR(inode); + goto out; + } + d_instantiate(dentry, inode); + } out: btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); return ret; @@ -639,7 +646,7 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir, ret = PTR_ERR(inode); goto fail; } - BUG_ON(!inode); + d_instantiate(dentry, inode); ret = 0; fail: -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html