Merge branch 'vfs-cleanups' (random vfs cleanups)

This teaches vfs_fstat() to use the appropriate f[get|put]_light
functions, allowing it to avoid some unnecessary locking for the common
case.

More noticeably, it also cleans up and simplifies the "getname_flags()"
function, which now relies on the architecture strncpy_from_user() doing
all the user access checks properly, instead of hacking around the fact
that on x86 it didn't use to do it right (see commit 92ae03f2ef99: "x86:
merge 32/64-bit versions of 'strncpy_from_user()' and speed it up").

* vfs-cleanups:
  VFS: make vfs_fstat() use f[get|put]_light()
  VFS: clean up and simplify getname_flags()
  x86: make word-at-a-time strncpy_from_user clear bytes at the end

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/stat.c b/fs/stat.c
index b30ac60291e2..0cef3366a919 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -57,12 +57,13 @@ EXPORT_SYMBOL(vfs_getattr);
 
 int vfs_fstat(unsigned int fd, struct kstat *stat)
 {
-        struct file *f = fget(fd);
+        int fput_needed;
+        struct file *f = fget_light(fd, &fput_needed);
         int error = -EBADF;
 
         if (f) {
                 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
-                fput(f);
+                fput_light(f, fput_needed);
         }
         return error;
 }