clean statfs-like syscalls up

New helpers: user_statfs() and fd_statfs(), taking userland pathname and
descriptor resp. and filling struct kstatfs.  Syscalls of statfs family
(native, compat and foreign - osf and hpux on alpha and parisc resp.)
switched to those.  Removes some boilerplate code, simplifies cleanup
on errors...

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

1 files changed, 8 insertions, 28 deletions

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index fe698b5045e9..376f22130791 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -230,44 +230,24 @@ linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_st
         return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
 }
 
-static int
-do_osf_statfs(struct path *path, struct osf_statfs __user *buffer,
-              unsigned long bufsiz)
+SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname,
+                struct osf_statfs __user *, buffer, unsigned long, bufsiz)
 {
         struct kstatfs linux_stat;
-        int error = vfs_statfs(path, &linux_stat);
+        int error = user_statfs(pathname, &linux_stat);
         if (!error)
                 error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
         return error;   
 }
 
-SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname,
-                struct osf_statfs __user *, buffer, unsigned long, bufsiz)
-{
-        struct path path;
-        int retval;
-
-        retval = user_path(pathname, &path);
-        if (!retval) {
-                retval = do_osf_statfs(&path, buffer, bufsiz);
-                path_put(&path);
-        }
-        return retval;
-}
-
 SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd,
                 struct osf_statfs __user *, buffer, unsigned long, bufsiz)
 {
-        struct file *file;
-        int retval;
-
-        retval = -EBADF;
-        file = fget(fd);
-        if (file) {
-                retval = do_osf_statfs(&file->f_path, buffer, bufsiz);
-                fput(file);
-        }
-        return retval;
+        struct kstatfs linux_stat;
+        int error = fd_statfs(fd, &linux_stat);
+        if (!error)
+                error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
+        return error;
 }
 
 /*