mm: drop actor argument of do_generic_file_read()

There's only one caller of do_generic_file_read() and the only actor is
file_read_actor().  No reason to have a callback parameter.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/filemap.c b/mm/filemap.c
index ae4846f..b7749a9 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1090,7 +1090,6 @@ static void shrink_readahead_size_eio(struct file *filp,
  * @filp:      the file to read
  * @ppos:      current file position
  * @desc:      read_descriptor
- * @actor:     read method
  *
  * This is a generic file read routine, and uses the
  * mapping->a_ops->readpage() function for the actual low-level stuff.
@@ -1099,7 +1098,7 @@ static void shrink_readahead_size_eio(struct file *filp,
  * of the logic when it comes to error handling etc.
  */
 static void do_generic_file_read(struct file *filp, loff_t *ppos,
-               read_descriptor_t *desc, read_actor_t actor)
+               read_descriptor_t *desc)
 {
        struct address_space *mapping = filp->f_mapping;
        struct inode *inode = mapping->host;
@@ -1200,13 +1199,14 @@ page_ok:
                 * Ok, we have the page, and it's up-to-date, so
                 * now we can copy it to user space...
                 *
-                * The actor routine returns how many bytes were actually used..
+                * The file_read_actor routine returns how many bytes were
+                * actually used..
                 * NOTE! This may not be the same as how much of a user buffer
                 * we filled up (we may be padding etc), so we can only update
                 * "pos" here (the actor routine has to update the user buffer
                 * pointers and the remaining count).
                 */
-               ret = actor(desc, page, offset, nr);
+               ret = file_read_actor(desc, page, offset, nr);
                offset += ret;
                index += offset >> PAGE_CACHE_SHIFT;
                offset &= ~PAGE_CACHE_MASK;
@@ -1479,7 +1479,7 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
                if (desc.count == 0)
                        continue;
                desc.error = 0;
-               do_generic_file_read(filp, ppos, &desc, file_read_actor);
+               do_generic_file_read(filp, ppos, &desc);
                retval += desc.written;
                if (desc.error) {
                        retval = retval ?: desc.error;