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authorOmar Sandoval <osandov@fb.com>2022-03-15 04:12:35 +0300
committerDavid Sterba <dsterba@suse.com>2022-05-16 18:03:08 +0300
commitcaae78e032343df525b8d05c58b462827f10b2a3 (patch)
tree305c5efe04d99e033a4f624d1d762ecbdb25cc8b /fs/btrfs/props.c
parent3538d68dbd97a2f5599bf39aeee47f027417fc39 (diff)
downloadlinux-caae78e032343df525b8d05c58b462827f10b2a3.tar.xz
btrfs: move common inode creation code into btrfs_create_new_inode()
All of our inode creation code paths duplicate the calls to btrfs_init_inode_security() and btrfs_add_link(). Subvolume creation additionally duplicates property inheritance and the call to btrfs_set_inode_index(). Fix this by moving the common code into btrfs_create_new_inode(). This accomplishes a few things at once: 1. It reduces code duplication. 2. It allows us to set up the inode completely before inserting the inode item, removing calls to btrfs_update_inode(). 3. It fixes a leak of an inode on disk in some error cases. For example, in btrfs_create(), if btrfs_new_inode() succeeds, then we have inserted an inode item and its inode ref. However, if something after that fails (e.g., btrfs_init_inode_security()), then we end the transaction and then decrement the link count on the inode. If the transaction is committed and the system crashes before the failed inode is deleted, then we leak that inode on disk. Instead, this refactoring aborts the transaction when we can't recover more gracefully. 4. It exposes various ways that subvolume creation diverges from mkdir in terms of inheriting flags, properties, permissions, and POSIX ACLs, a lot of which appears to be accidental. This patch explicitly does _not_ change the existing non-standard behavior, but it makes those differences more clear in the code and documents them so that we can discuss whether they should be changed. Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/props.c')
-rw-r--r--fs/btrfs/props.c40
1 files changed, 2 insertions, 38 deletions
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index 1b31481f9e72..a2ec8ecae8de 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -380,9 +380,8 @@ static struct prop_handler prop_handlers[] = {
},
};
-static int inherit_props(struct btrfs_trans_handle *trans,
- struct inode *inode,
- struct inode *parent)
+int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
+ struct inode *inode, struct inode *parent)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_fs_info *fs_info = root->fs_info;
@@ -457,41 +456,6 @@ static int inherit_props(struct btrfs_trans_handle *trans,
return 0;
}
-int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
- struct inode *inode,
- struct inode *dir)
-{
- if (!dir)
- return 0;
-
- return inherit_props(trans, inode, dir);
-}
-
-int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_root *parent_root)
-{
- struct super_block *sb = root->fs_info->sb;
- struct inode *parent_inode, *child_inode;
- int ret;
-
- parent_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, parent_root);
- if (IS_ERR(parent_inode))
- return PTR_ERR(parent_inode);
-
- child_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, root);
- if (IS_ERR(child_inode)) {
- iput(parent_inode);
- return PTR_ERR(child_inode);
- }
-
- ret = inherit_props(trans, child_inode, parent_inode);
- iput(child_inode);
- iput(parent_inode);
-
- return ret;
-}
-
void __init btrfs_props_init(void)
{
int i;