From 9f285c9db91c931181609645b7d042a2ae7f55f4 Mon Sep 17 00:00:00 2001
From: braam <braam>
Date: Sat, 22 Jun 2002 17:13:54 +0000
Subject: [PATCH] Page must be mapped before prepare write, since on ENOSPACE
 we fall into lustre_put_page and do kunmap (this crashes on highmem machines
 if the page wasn't mapped).

---
 lustre/obdfilter/filter.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lustre/obdfilter/filter.c b/lustre/obdfilter/filter.c
index 49e46b0..8148df7 100644
--- a/lustre/obdfilter/filter.c
+++ b/lustre/obdfilter/filter.c
@@ -1096,6 +1096,7 @@ struct page *filter_get_page_write(struct inode *inode, unsigned long index,
                  * a no-op for most filesystems, because we write the whole
                  * page.  For partial-page I/O this will read in the page.
                  */
+                kmap(page);
                 rc = mapping->a_ops->prepare_write(NULL, page, 0, PAGE_SIZE);
                 if (rc) {
                         CERROR("page index %lu, rc = %d\n", index, rc);
@@ -1109,8 +1110,6 @@ struct page *filter_get_page_write(struct inode *inode, unsigned long index,
                         LBUG();
                         GOTO(err_unlock, rc = -EIO);
                 }
-
-                kmap(page);
         }
         return page;
 
-- 
1.8.3.1