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VFS: rename kern_path_locked() and related functions.

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kern_path_locked() is now only used to prepare for removing an object
from the filesystem (and that is the only credible reason for wanting a
positive locked dentry).  Thus it corresponds to kern_path_create() and
so should have a corresponding name.

Unfortunately the name "kern_path_create" is somewhat misleading as it
doesn't actually create anything.  The recently added
simple_start_creating() provides a better pattern I believe.  The
"start" can be matched with "end" to bracket the creating or removing.

So this patch changes names:

 kern_path_locked -> start_removing_path
 kern_path_create -> start_creating_path
 user_path_create -> start_creating_user_path
 user_path_locked_at -> start_removing_user_path_at
 done_path_create -> end_creating_path

and also introduces end_removing_path() which is identical to
end_creating_path().

__start_removing_path (which was __kern_path_locked) is enhanced to
call mnt_want_write() for consistency with the start_creating_path().

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
NeilBrown
2025-09-22 14:29:52 +10:00
committed by Christian Brauner
parent 76a53de6f7
commit 3d18f80ce1
11 changed files with 93 additions and 67 deletions
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6
net/unix/af_unix.c
View File

@@ -1387,7 +1387,7 @@ static int unix_bind_bsd(struct sock *sk, struct sockaddr_un *sunaddr,
* Get the parent directory, calculate the hash for last
* component.
*/
dentry = kern_path_create(AT_FDCWD, addr->name->sun_path, &parent, 0);
dentry = start_creating_path(AT_FDCWD, addr->name->sun_path, &parent, 0);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
goto out;
@@ -1417,7 +1417,7 @@ static int unix_bind_bsd(struct sock *sk, struct sockaddr_un *sunaddr,
unix_table_double_unlock(net, old_hash, new_hash);
unix_insert_bsd_socket(sk);
mutex_unlock(&u->bindlock);
done_path_create(&parent, dentry);
end_creating_path(&parent, dentry);
return 0;
out_unlock:
@@ -1427,7 +1427,7 @@ out_unlink:
/* failed after successful mknod? unlink what we'd created... */
vfs_unlink(idmap, d_inode(parent.dentry), dentry, NULL);
out_path:
done_path_create(&parent, dentry);
end_creating_path(&parent, dentry);
out:
unix_release_addr(addr);
return err == -EEXIST ? -EADDRINUSE : err;