vfs: replace ints with enum last_type for LAST_XXX

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. Define an enum
last_type to make this type explicit.

Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>
Link: https://patch.msgid.link/20260528175854.57626-2-jkoolstra@xs4all.nl
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

1 files changed, 16 insertions, 12 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 05291e6f4bba..026165f6fcb6 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -132,7 +132,7 @@ static struct kmem_cache *__names_cache __ro_after_init;
 /*
  * Type of the last component on LOOKUP_PARENT
  */
-enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT};
+enum last_type {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT};
 
 void __init filename_init(void)
 {
@@ -732,7 +732,7 @@ struct nameidata {
 	struct inode	*inode; /* path.dentry.d_inode */
 	unsigned int	flags, state;
 	unsigned	seq, next_seq, m_seq, r_seq;
-	int		last_type;
+	enum last_type	last_type;
 	unsigned	depth;
 	int		total_link_count;
 	struct saved {
@@ -2225,7 +2225,7 @@ in_root:
 	return dget(nd->path.dentry);
 }
 
-static const char *handle_dots(struct nameidata *nd, int type)
+static const char *handle_dots(struct nameidata *nd, enum last_type type)
 {
 	if (type == LAST_DOTDOT) {
 		const char *error = NULL;
@@ -2873,7 +2873,7 @@ 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 last_type *type,
 			       const struct path *root)
 {
 	int retval;
@@ -2898,7 +2898,7 @@ 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 last_type *type)
 {
 	return __filename_parentat(dfd, name, flags, parent, last, type, NULL);
 }
@@ -2966,7 +2966,8 @@ 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 last_type type;
+	int error;
 
 	error = filename_parentat(dfd, name, 0, &parent_path, &last, &type);
 	if (error)
@@ -3012,7 +3013,8 @@ 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 last_type type;
+	int error;
 
 	error = filename_parentat(AT_FDCWD, filename, 0, &parent_path, &last, &type);
 	if (error)
@@ -3062,7 +3064,7 @@ int vfs_path_parent_lookup(struct filename *filename, unsigned int flags,
 			   struct path *parent, struct qstr *last,
 			   const struct path *root)
 {
-	int type;
+	enum last_type type;
 	int err =  __filename_parentat(AT_FDCWD, filename, flags, parent, last,
 				       &type, root);
 	if (err)
@@ -4941,7 +4943,7 @@ 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 last_type type;
 	int error;
 
 	error = filename_parentat(dfd, name, reval_flag, path, &last, &type);
@@ -5403,7 +5405,7 @@ int filename_rmdir(int dfd, struct filename *name)
 	struct dentry *dentry;
 	struct path path;
 	struct qstr last;
-	int type;
+	enum last_type type;
 	unsigned int lookup_flags = 0;
 	struct delegated_inode delegated_inode = { };
 retry:
@@ -5412,6 +5414,8 @@ retry:
 		return error;
 
 	switch (type) {
+	case LAST_NORM:
+		break;
 	case LAST_DOTDOT:
 		error = -ENOTEMPTY;
 		goto exit2;
@@ -5545,7 +5549,7 @@ int filename_unlinkat(int dfd, struct filename *name)
 	struct dentry *dentry;
 	struct path path;
 	struct qstr last;
-	int type;
+	enum last_type type;
 	struct inode *inode;
 	struct delegated_inode delegated_inode = { };
 	unsigned int lookup_flags = 0;
@@ -6112,7 +6116,7 @@ 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 last_type old_type, new_type;
 	struct delegated_inode delegated_inode = { };
 	unsigned int lookup_flags = 0;
 	bool should_retry = false;