commit a94733d0bc630edaedc6ca156752dd5a7cb82521
author Josef Bacik <josef@redhat.com> Mon Jul 11 10:47:06 2011 -0400
committer Chris Mason <chris.mason@oracle.com> Wed Jul 27 12:46:43 2011 -0400
tree 3f0bd508aa1ce5894e43df45bb73031a380ed8f5
parent bab39bf998133510f2dad08158006197ec0dabea

Btrfs: use find_or_create_page instead of grab_cache_page

grab_cache_page will use mapping_gfp_mask(), which for all inodes is set to
GFP_HIGHUSER_MOVABLE.  So instead use find_or_create_page in all cases where we
need GFP_NOFS so we don't deadlock.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

fs/btrfs/ioctl.c

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a3c4751..09c9a8d 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -867,8 +867,8 @@
 	/* step one, lock all the pages */
 	for (i = 0; i < num_pages; i++) {
 		struct page *page;
-		page = grab_cache_page(inode->i_mapping,
-					    start_index + i);
+		page = find_or_create_page(inode->i_mapping,
+					    start_index + i, GFP_NOFS);
 		if (!page)
 			break;