Revert the patch from Neil Brown to optimise NFSD writev handling.
Cc: Linux Memory Management <linux-mm@xxxxxxxxx>
Cc: Linux Filesystems <linux-fsdevel@xxxxxxxxxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
mm/filemap.c | 32 +++++++++++++-------------------
1 file changed, 13 insertions(+), 19 deletions(-)
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -1980,27 +1980,21 @@ generic_file_buffered_write(struct kiocb
/* Limit the size of the copy to the caller's write size */
bytes = min(bytes, count);
- /* We only need to worry about prefaulting when writes are from
- * user-space. NFSd uses vfs_writev with several non-aligned
- * segments in the vector, and limiting to one segment a time is
- * a noticeable performance for re-write
+ /*
+ * Limit the size of the copy to that of the current segment,
+ * because fault_in_pages_readable() doesn't know how to walk
+ * segments.
*/
- if (!segment_eq(get_fs(), KERNEL_DS)) {
- /*
- * Limit the size of the copy to that of the current
- * segment, because fault_in_pages_readable() doesn't
- * know how to walk segments.
- */
- bytes = min(bytes, cur_iov->iov_len - iov_base);
+ bytes = min(bytes, cur_iov->iov_len - iov_base);
+
+ /*
+ * Bring in the user page that we will copy from _first_.
+ * Otherwise there's a nasty deadlock on copying from the
+ * same page as we're writing to, without it being marked
+ * up-to-date.
+ */
+ fault_in_pages_readable(buf, bytes);
- /*
- * Bring in the user page that we will copy from
- * _first_. Otherwise there's a nasty deadlock on
- * copying from the same page as we're writing to,
- * without it being marked up-to-date.
- */
- fault_in_pages_readable(buf, bytes);
- }
page = __grab_cache_page(mapping,index,&cached_page,&lru_pvec);
if (!page) {
status = -ENOMEM;
--
-
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