[PATCH v5.4-v4.19 1/6] fs: implement vfs_stat and vfs_lstat in terms of vfs_fstatat

[Miao Wang via B4 Relay <devnull+shankerwangmiao.gmail.com@kernel.org>]

From: Christoph Hellwig <hch@lst.de>

commit 0b2c669 upstream.

Go through vfs_fstatat instead of duplicating the *stat to statx mapping
three times.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Cc: <stable@vger.kernel.org> # 4.19.x-5.4.x
Signed-off-by: Miao Wang <shankerwangmiao@gmail.com>
Tested-by: Xi Ruoyao <xry111@xry111.site>
---
 include/linux/fs.h | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index d4f5fcc60744..2db4e5f7d00b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3262,16 +3262,6 @@ extern int iterate_dir(struct file *, struct dir_context *);
 extern int vfs_statx(int, const char __user *, int, struct kstat *, u32);
 extern int vfs_statx_fd(unsigned int, struct kstat *, u32, unsigned int);
 
-static inline int vfs_stat(const char __user *filename, struct kstat *stat)
-{
-	return vfs_statx(AT_FDCWD, filename, AT_NO_AUTOMOUNT,
-			 stat, STATX_BASIC_STATS);
-}
-static inline int vfs_lstat(const char __user *name, struct kstat *stat)
-{
-	return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT,
-			 stat, STATX_BASIC_STATS);
-}
 static inline int vfs_fstatat(int dfd, const char __user *filename,
 			      struct kstat *stat, int flags)
 {
@@ -3283,6 +3273,14 @@ static inline int vfs_fstat(int fd, struct kstat *stat)
 	return vfs_statx_fd(fd, stat, STATX_BASIC_STATS, 0);
 }
 
+static inline int vfs_stat(const char __user *filename, struct kstat *stat)
+{
+	return vfs_fstatat(AT_FDCWD, filename, stat, 0);
+}
+static inline int vfs_lstat(const char __user *name, struct kstat *stat)
+{
+	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
+}
 
 extern const char *vfs_get_link(struct dentry *, struct delayed_call *);
 extern int vfs_readlink(struct dentry *, char __user *, int);

-- 
2.43.0