preadv/pwritev: create compat_writev()

Factor out some code from compat_sys_writev() which can be shared with the
upcoming compat_sys_pwritev().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <linux-api@vger.kernel.org>
Cc: <linux-arch@vger.kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 7 deletions

diff --git a/fs/compat.c b/fs/compat.c
index e99048c21c56..e04b4660db84 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1232,15 +1232,12 @@ compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
         return ret;
 }
 
-asmlinkage ssize_t
-compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
+static size_t compat_writev(struct file *file,
+                            const struct compat_iovec __user *vec,
+                            unsigned long vlen, loff_t *pos)
 {
-        struct file *file;
         ssize_t ret = -EBADF;
 
-        file = fget(fd);
-        if (!file)
-                return -EBADF;
         if (!(file->f_mode & FMODE_WRITE))
                 goto out;
 
@@ -1248,12 +1245,26 @@ compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsig
         if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
                 goto out;
 
-        ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
+        ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
 
 out:
         if (ret > 0)
                 add_wchar(current, ret);
         inc_syscw(current);
+        return ret;
+}
+
+asmlinkage ssize_t
+compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
+                  unsigned long vlen)
+{
+        struct file *file;
+        ssize_t ret;
+
+        file = fget(fd);
+        if (!file)
+                return -EBADF;
+        ret = compat_writev(file, vec, vlen, &file->f_pos);
         fput(file);
         return ret;
 }