[PATCH v2] vfs: replace ints with enum component_type for LAST_XXX
From: Jori Koolstra
Date: Wed Apr 01 2026 - 14:00:25 EST
Several functions in namei.c take an "int *type" parameter, such as
filename_parentat(). To know what values this can take you have to find
the anonymous struct that defines the LAST_XXX values. I would argue
that the readability of the code is improved by making this an explicit
type.
Signed-off-by: Jori Koolstra <jkoolstra@xxxxxxxxx>
---
v2: move back to LAST_XXX and change int to component_type in
fs/smb/server/vfs.c.
---
fs/namei.c | 41 ++++++++++++++++++++++-------------------
fs/smb/server/vfs.c | 5 +++--
include/linux/namei.h | 4 ++--
3 files changed, 27 insertions(+), 23 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 9e5500dad14f..a880454a6415 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -721,15 +721,15 @@ EXPORT_SYMBOL(path_put);
#define EMBEDDED_LEVELS 2
struct nameidata {
- struct path path;
- struct qstr last;
- struct path root;
- struct inode *inode; /* path.dentry.d_inode */
- unsigned int flags, state;
- unsigned seq, next_seq, m_seq, r_seq;
- int last_type;
- unsigned depth;
- int total_link_count;
+ struct path path;
+ struct qstr last;
+ struct path root;
+ struct inode *inode; /* path.dentry.d_inode */
+ unsigned int flags, state;
+ unsigned seq, next_seq, m_seq, r_seq;
+ enum component_type last_type;
+ unsigned depth;
+ int total_link_count;
struct saved {
struct path link;
struct delayed_call done;
@@ -2221,7 +2221,7 @@ static struct dentry *follow_dotdot(struct nameidata *nd)
return dget(nd->path.dentry);
}
-static const char *handle_dots(struct nameidata *nd, int type)
+static const char *handle_dots(struct nameidata *nd, enum component_type type)
{
if (type == LAST_DOTDOT) {
const char *error = NULL;
@@ -2869,7 +2869,7 @@ static int path_parentat(struct nameidata *nd, unsigned flags,
/* Note: this does not consume "name" */
static int __filename_parentat(int dfd, struct filename *name,
unsigned int flags, struct path *parent,
- struct qstr *last, int *type,
+ struct qstr *last, enum component_type *type,
const struct path *root)
{
int retval;
@@ -2894,7 +2894,7 @@ static int __filename_parentat(int dfd, struct filename *name,
static int filename_parentat(int dfd, struct filename *name,
unsigned int flags, struct path *parent,
- struct qstr *last, int *type)
+ struct qstr *last, enum component_type *type)
{
return __filename_parentat(dfd, name, flags, parent, last, type, NULL);
}
@@ -2963,7 +2963,8 @@ static struct dentry *__start_removing_path(int dfd, struct filename *name,
struct path parent_path __free(path_put) = {};
struct dentry *d;
struct qstr last;
- int type, error;
+ enum component_type type;
+ int error;
error = filename_parentat(dfd, name, 0, &parent_path, &last, &type);
if (error)
@@ -3009,7 +3010,8 @@ struct dentry *kern_path_parent(const char *name, struct path *path)
CLASS(filename_kernel, filename)(name);
struct dentry *d;
struct qstr last;
- int type, error;
+ enum component_type type;
+ int error;
error = filename_parentat(AT_FDCWD, filename, 0, &parent_path, &last, &type);
if (error)
@@ -3057,7 +3059,7 @@ EXPORT_SYMBOL(kern_path);
* @root: pointer to struct path of the base directory
*/
int vfs_path_parent_lookup(struct filename *filename, unsigned int flags,
- struct path *parent, struct qstr *last, int *type,
+ struct path *parent, struct qstr *last, enum component_type *type,
const struct path *root)
{
return __filename_parentat(AT_FDCWD, filename, flags, parent, last,
@@ -4903,7 +4905,7 @@ static struct dentry *filename_create(int dfd, struct filename *name,
bool want_dir = lookup_flags & LOOKUP_DIRECTORY;
unsigned int reval_flag = lookup_flags & LOOKUP_REVAL;
unsigned int create_flags = LOOKUP_CREATE | LOOKUP_EXCL;
- int type;
+ enum component_type type;
int error;
error = filename_parentat(dfd, name, reval_flag, path, &last, &type);
@@ -5365,7 +5367,7 @@ int filename_rmdir(int dfd, struct filename *name)
struct dentry *dentry;
struct path path;
struct qstr last;
- int type;
+ enum component_type type;
unsigned int lookup_flags = 0;
struct delegated_inode delegated_inode = { };
retry:
@@ -5383,6 +5385,7 @@ int filename_rmdir(int dfd, struct filename *name)
case LAST_ROOT:
error = -EBUSY;
goto exit2;
+ case LAST_NORM: ; // OK
}
error = mnt_want_write(path.mnt);
@@ -5507,7 +5510,7 @@ int filename_unlinkat(int dfd, struct filename *name)
struct dentry *dentry;
struct path path;
struct qstr last;
- int type;
+ enum component_type type;
struct inode *inode;
struct delegated_inode delegated_inode = { };
unsigned int lookup_flags = 0;
@@ -6074,7 +6077,7 @@ int filename_renameat2(int olddfd, struct filename *from,
struct renamedata rd;
struct path old_path, new_path;
struct qstr old_last, new_last;
- int old_type, new_type;
+ enum component_type old_type, new_type;
struct delegated_inode delegated_inode = { };
unsigned int lookup_flags = 0;
bool should_retry = false;
diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index d08973b288e5..b12d481f5ba9 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -56,7 +56,8 @@ static int ksmbd_vfs_path_lookup(struct ksmbd_share_config *share_conf,
{
struct qstr last;
const struct path *root_share_path = &share_conf->vfs_path;
- int err, type;
+ int err;
+ enum component_type type;
struct dentry *d;
if (pathname[0] == '\0') {
@@ -668,7 +669,7 @@ int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
struct renamedata rd;
struct ksmbd_share_config *share_conf = work->tcon->share_conf;
struct ksmbd_file *parent_fp;
- int new_type;
+ enum component_type new_type;
int err, lookup_flags = LOOKUP_NO_SYMLINKS;
if (ksmbd_override_fsids(work))
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 58600cf234bc..fa3ae87762b7 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -16,7 +16,7 @@ enum { MAX_NESTED_LINKS = 8 };
/*
* Type of the last component on LOOKUP_PARENT
*/
-enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT};
+enum component_type {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT};
/* pathwalk mode */
#define LOOKUP_FOLLOW BIT(0) /* follow links at the end */
@@ -70,7 +70,7 @@ static inline void end_removing_path(const struct path *path , struct dentry *de
end_creating_path(path, dentry);
}
int vfs_path_parent_lookup(struct filename *filename, unsigned int flags,
- struct path *parent, struct qstr *last, int *type,
+ struct path *parent, struct qstr *last, enum component_type *type,
const struct path *root);
int vfs_path_lookup(struct dentry *, struct vfsmount *, const char *,
unsigned int, struct path *);
--
2.53.0