diff options
| author | NeilBrown <neil@brown.name> | 2025-11-13 11:18:31 +1100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-11-14 13:15:57 +0100 |
| commit | 7bb1eb45e43c4730cbc5a48b9e9295049fccdacb (patch) | |
| tree | 8265d0f9a52a8b4655170ab0c7427af1f99a7c67 /include/linux/namei.h | |
| parent | 1ead2213dd7d14fecad7414e9dbeb2161cfcf8c3 (diff) | |
VFS: introduce start_removing_dentry()
start_removing_dentry() is similar to start_removing() but instead of
providing a name for lookup, the target dentry is given.
start_removing_dentry() checks that the dentry is still hashed and in
the parent, and if so it locks and increases the refcount so that
end_removing() can be used to finish the operation.
This is used in cachefiles, overlayfs, smb/server, and apparmor.
There will be other users including ecryptfs.
As start_removing_dentry() takes an extra reference to the dentry (to be
put by end_removing()), there is no need to explicitly take an extra
reference to stop d_delete() from using dentry_unlink_inode() to negate
the dentry - as in cachefiles_delete_object(), and ksmbd_vfs_unlink().
cachefiles_bury_object() now gets an extra ref to the victim, which is
drops. As it includes the needed end_removing() calls, the caller
doesn't need them.
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neil@brown.name>
Link: https://patch.msgid.link/20251113002050.676694-9-neilb@ownmail.net
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include/linux/namei.h')
| -rw-r--r-- | include/linux/namei.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/namei.h b/include/linux/namei.h index 688e157d6afc..7e916e9d7726 100644 --- a/include/linux/namei.h +++ b/include/linux/namei.h @@ -94,6 +94,8 @@ struct dentry *start_removing(struct mnt_idmap *idmap, struct dentry *parent, struct qstr *name); struct dentry *start_creating_noperm(struct dentry *parent, struct qstr *name); struct dentry *start_removing_noperm(struct dentry *parent, struct qstr *name); +struct dentry *start_removing_dentry(struct dentry *parent, + struct dentry *child); /** * end_creating - finish action started with start_creating |