kill vfs_stat_fd / vfs_lstat_fd

There's really no reason to keep vfs_stat_fd and vfs_lstat_fd with
Oleg's vfs_fstatat.  Use vfs_fstatat for the few cases having the
directory fd, and switch all others to vfs_stat / vfs_lstat.

Reviewed-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 42 insertions, 63 deletions

diff --git a/fs/stat.c b/fs/stat.c
index 54711662b855..075694e31d8b 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -55,46 +55,6 @@ int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 
 EXPORT_SYMBOL(vfs_getattr);
 
-int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
-{
-        struct path path;
-        int error;
-
-        error = user_path_at(dfd, name, LOOKUP_FOLLOW, &path);
-        if (!error) {
-                error = vfs_getattr(path.mnt, path.dentry, stat);
-                path_put(&path);
-        }
-        return error;
-}
-
-int vfs_stat(char __user *name, struct kstat *stat)
-{
-        return vfs_stat_fd(AT_FDCWD, name, stat);
-}
-
-EXPORT_SYMBOL(vfs_stat);
-
-int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
-{
-        struct path path;
-        int error;
-
-        error = user_path_at(dfd, name, 0, &path);
-        if (!error) {
-                error = vfs_getattr(path.mnt, path.dentry, stat);
-                path_put(&path);
-        }
-        return error;
-}
-
-int vfs_lstat(char __user *name, struct kstat *stat)
-{
-        return vfs_lstat_fd(AT_FDCWD, name, stat);
-}
-
-EXPORT_SYMBOL(vfs_lstat);
-
 int vfs_fstat(unsigned int fd, struct kstat *stat)
 {
         struct file *f = fget(fd);
@@ -106,26 +66,43 @@ int vfs_fstat(unsigned int fd, struct kstat *stat)
         }
         return error;
 }
-
 EXPORT_SYMBOL(vfs_fstat);
 
 int vfs_fstatat(int dfd, char __user *filename, struct kstat *stat, int flag)
 {
+        struct path path;
         int error = -EINVAL;
+        int lookup_flags = 0;
 
         if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
                 goto out;
 
-        if (flag & AT_SYMLINK_NOFOLLOW)
-                error = vfs_lstat_fd(dfd, filename, stat);
-        else
-                error = vfs_stat_fd(dfd, filename, stat);
+        if (!(flag & AT_SYMLINK_NOFOLLOW))
+                lookup_flags |= LOOKUP_FOLLOW;
+
+        error = user_path_at(dfd, filename, lookup_flags, &path);
+        if (error)
+                goto out;
+
+        error = vfs_getattr(path.mnt, path.dentry, stat);
+        path_put(&path);
 out:
         return error;
 }
-
 EXPORT_SYMBOL(vfs_fstatat);
 
+int vfs_stat(char __user *name, struct kstat *stat)
+{
+        return vfs_fstatat(AT_FDCWD, name, stat, 0);
+}
+EXPORT_SYMBOL(vfs_stat);
+
+int vfs_lstat(char __user *name, struct kstat *stat)
+{
+        return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
+}
+EXPORT_SYMBOL(vfs_lstat);
+
 
 #ifdef __ARCH_WANT_OLD_STAT
 
@@ -173,23 +150,25 @@ static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * sta
 SYSCALL_DEFINE2(stat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
 {
         struct kstat stat;
-        int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
+        int error;
 
-        if (!error)
-                error = cp_old_stat(&stat, statbuf);
+        error = vfs_stat(filename, &stat);
+        if (error)
+                return error;
 
-        return error;
+        return cp_old_stat(&stat, statbuf);
 }
 
 SYSCALL_DEFINE2(lstat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
 {
         struct kstat stat;
-        int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
+        int error;
 
-        if (!error)
-                error = cp_old_stat(&stat, statbuf);
+        error = vfs_lstat(filename, &stat);
+        if (error)
+                return error;
 
-        return error;
+        return cp_old_stat(&stat, statbuf);
 }
 
 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
@@ -258,23 +237,23 @@ static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
 SYSCALL_DEFINE2(newstat, char __user *, filename, struct stat __user *, statbuf)
 {
         struct kstat stat;
-        int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
-
-        if (!error)
-                error = cp_new_stat(&stat, statbuf);
+        int error = vfs_stat(filename, &stat);
 
-        return error;
+        if (error)
+                return error;
+        return cp_new_stat(&stat, statbuf);
 }
 
 SYSCALL_DEFINE2(newlstat, char __user *, filename, struct stat __user *, statbuf)
 {
         struct kstat stat;
-        int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
+        int error;
 
-        if (!error)
-                error = cp_new_stat(&stat, statbuf);
+        error = vfs_lstat(filename, &stat);
+        if (error)
+                return error;
 
-        return error;
+        return cp_new_stat(&stat, statbuf);
 }
 
 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)