From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/include/linux/namei.h | 80 ++++++++++++++++------------------------
1 files changed, 32 insertions(+), 48 deletions(-)
diff --git a/kernel/include/linux/namei.h b/kernel/include/linux/namei.h
index e53a912..b9605b2 100644
--- a/kernel/include/linux/namei.h
+++ b/kernel/include/linux/namei.h
@@ -2,6 +2,7 @@
#ifndef _LINUX_NAMEI_H
#define _LINUX_NAMEI_H
+#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/path.h>
#include <linux/fcntl.h>
@@ -14,38 +15,40 @@
/*
* Type of the last component on LOOKUP_PARENT
*/
-enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
+enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT};
-/*
- * The bitmask for a lookup event:
- * - follow links at the end
- * - require a directory
- * - ending slashes ok even for nonexistent files
- * - internal "there are more path components" flag
- * - dentry cache is untrusted; force a real lookup
- * - suppress terminal automount
- */
-#define LOOKUP_FOLLOW 0x0001
-#define LOOKUP_DIRECTORY 0x0002
-#define LOOKUP_AUTOMOUNT 0x0004
+/* pathwalk mode */
+#define LOOKUP_FOLLOW 0x0001 /* follow links at the end */
+#define LOOKUP_DIRECTORY 0x0002 /* require a directory */
+#define LOOKUP_AUTOMOUNT 0x0004 /* force terminal automount */
+#define LOOKUP_EMPTY 0x4000 /* accept empty path [user_... only] */
+#define LOOKUP_DOWN 0x8000 /* follow mounts in the starting point */
+#define LOOKUP_MOUNTPOINT 0x0080 /* follow mounts in the end */
+#define LOOKUP_REVAL 0x0020 /* tell ->d_revalidate() to trust no cache */
+#define LOOKUP_RCU 0x0040 /* RCU pathwalk mode; semi-internal */
+
+/* These tell filesystem methods that we are dealing with the final component... */
+#define LOOKUP_OPEN 0x0100 /* ... in open */
+#define LOOKUP_CREATE 0x0200 /* ... in object creation */
+#define LOOKUP_EXCL 0x0400 /* ... in exclusive creation */
+#define LOOKUP_RENAME_TARGET 0x0800 /* ... in destination of rename() */
+
+/* internal use only */
#define LOOKUP_PARENT 0x0010
-#define LOOKUP_REVAL 0x0020
-#define LOOKUP_RCU 0x0040
-#define LOOKUP_NO_REVAL 0x0080
-
-/*
- * Intent data
- */
-#define LOOKUP_OPEN 0x0100
-#define LOOKUP_CREATE 0x0200
-#define LOOKUP_EXCL 0x0400
-#define LOOKUP_RENAME_TARGET 0x0800
-
#define LOOKUP_JUMPED 0x1000
#define LOOKUP_ROOT 0x2000
-#define LOOKUP_EMPTY 0x4000
-#define LOOKUP_DOWN 0x8000
+#define LOOKUP_ROOT_GRABBED 0x0008
+
+/* Scoping flags for lookup. */
+#define LOOKUP_NO_SYMLINKS 0x010000 /* No symlink crossing. */
+#define LOOKUP_NO_MAGICLINKS 0x020000 /* No nd_jump_link() crossing. */
+#define LOOKUP_NO_XDEV 0x040000 /* No mountpoint crossing. */
+#define LOOKUP_BENEATH 0x080000 /* No escaping from starting point. */
+#define LOOKUP_IN_ROOT 0x100000 /* Treat dirfd as fs root. */
+#define LOOKUP_CACHED 0x200000 /* Only do cached lookup */
+/* LOOKUP_* flags which do scope-related checks based on the dirfd. */
+#define LOOKUP_IS_SCOPED (LOOKUP_BENEATH | LOOKUP_IN_ROOT)
extern int path_pts(struct path *path);
@@ -57,36 +60,17 @@
return user_path_at_empty(dfd, name, flags, path, NULL);
}
-static inline int user_path(const char __user *name, struct path *path)
-{
- return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL);
-}
-
-static inline int user_lpath(const char __user *name, struct path *path)
-{
- return user_path_at_empty(AT_FDCWD, name, 0, path, NULL);
-}
-
-static inline int user_path_dir(const char __user *name, struct path *path)
-{
- return user_path_at_empty(AT_FDCWD, name,
- LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL);
-}
-
extern int kern_path(const char *, unsigned, struct path *);
extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
extern void done_path_create(struct path *, struct dentry *);
extern struct dentry *kern_path_locked(const char *, struct path *);
-extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
- const char *, unsigned int, struct path *);
-extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int);
extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
-extern struct dentry *lookup_one_len2(const char *, struct vfsmount *mnt, struct dentry *, int);
extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
+extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int);
extern int follow_down_one(struct path *);
extern int follow_down(struct path *);
@@ -95,7 +79,7 @@
extern struct dentry *lock_rename(struct dentry *, struct dentry *);
extern void unlock_rename(struct dentry *, struct dentry *);
-extern void nd_jump_link(struct path *path);
+extern int __must_check nd_jump_link(struct path *path);
static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
{
--
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