From fa6fe07d1536361a227d655e69ca270faf28fdbe Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 19 Mar 2025 14:01:35 +1100 Subject: VFS: rename lookup_one_len family to lookup_noperm and remove permission check The lookup_one_len family of functions is (now) only used internally by a filesystem on itself either - in a context where permission checking is irrelevant such as by a virtual filesystem populating itself, or xfs accessing its ORPHANAGE or dquota accessing the quota file; or - in a context where a permission check (MAY_EXEC on the parent) has just been performed such as a network filesystem finding in "silly-rename" file in the same directory. This is also the context after the _parentat() functions where currently lookup_one_qstr_excl() is used. So the permission check is pointless. The name "one_len" is unhelpful in understanding the purpose of these functions and should be changed. Most of the callers pass the len as "strlen()" so using a qstr and QSTR() can simplify the code. This patch renames these functions (include lookup_positive_unlocked() which is part of the family despite the name) to have a name based on "lookup_noperm". They are changed to receive a 'struct qstr' instead of separate name and len. In a few cases the use of QSTR() results in a new call to strlen(). try_lookup_noperm() takes a pointer to a qstr instead of the whole qstr. This is consistent with d_hash_and_lookup() (which is nearly identical) and useful for lookup_noperm_unlocked(). The new lookup_noperm_common() doesn't take a qstr yet. That will be tidied up in a subsequent patch. Signed-off-by: NeilBrown Link: https://lore.kernel.org/r/20250319031545.2999807-5-neil@brown.name Signed-off-by: Christian Brauner --- drivers/infiniband/hw/qib/qib_fs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/infiniband') diff --git a/drivers/infiniband/hw/qib/qib_fs.c b/drivers/infiniband/hw/qib/qib_fs.c index b9f4a2937c3a..2098de762bf5 100644 --- a/drivers/infiniband/hw/qib/qib_fs.c +++ b/drivers/infiniband/hw/qib/qib_fs.c @@ -90,7 +90,7 @@ static int create_file(const char *name, umode_t mode, int error; inode_lock(d_inode(parent)); - *dentry = lookup_one_len(name, parent, strlen(name)); + *dentry = lookup_noperm(&QSTR(name), parent); if (!IS_ERR(*dentry)) error = qibfs_mknod(d_inode(parent), *dentry, mode, fops, data); @@ -433,7 +433,7 @@ static int remove_device_files(struct super_block *sb, char unit[10]; snprintf(unit, sizeof(unit), "%u", dd->unit); - dir = lookup_one_len_unlocked(unit, sb->s_root, strlen(unit)); + dir = lookup_noperm_unlocked(&QSTR(unit), sb->s_root); if (IS_ERR(dir)) { pr_err("Lookup of %s failed\n", unit); -- cgit v1.2.3