btrfs_set_extent_delalloc() has the possibility of returning the error.
So I add the code in which the return value of btrfs_set_extent_delalloc()
is checked.

Signed-off-by: Tsutomu Itoh <t-i...@jp.fujitsu.com>
---
 fs/btrfs/ioctl.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0e92e57..95e27d6 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1016,13 +1016,16 @@ again:
        }
 
 
-       btrfs_set_extent_delalloc(inode, page_start, page_end - 1,
-                                 &cached_state);
+       ret = btrfs_set_extent_delalloc(inode, page_start, page_end - 1,
+                                       &cached_state);
 
        unlock_extent_cached(&BTRFS_I(inode)->io_tree,
                             page_start, page_end - 1, &cached_state,
                             GFP_NOFS);
 
+       if (ret)
+               goto out;
+
        for (i = 0; i < i_done; i++) {
                clear_page_dirty_for_io(pages[i]);
                ClearPageChecked(pages[i]);

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