ext4: update i_disksize coherently with block allocation on error path

In case of delalloc block i_disksize may be less than i_size. So we
have to update i_disksize each time we allocated and submitted some
blocks beyond i_disksize.  We weren't doing this on the error paths,
so fix this.

testcase: xfstest generic/019

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index b1ddd93..3aa26e9 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2077,6 +2077,7 @@ static int mpage_map_and_submit_extent(handle_t *handle,
        struct ext4_map_blocks *map = &mpd->map;
        int err;
        loff_t disksize;
+       int progress = 0;
 
        mpd->io_submit.io_end->offset =
                                ((loff_t)map->m_lblk) << inode->i_blkbits;
@@ -2093,8 +2094,11 @@ static int mpage_map_and_submit_extent(handle_t *handle,
                         * is non-zero, a commit should free up blocks.
                         */
                        if ((err == -ENOMEM) ||
-                           (err == -ENOSPC && ext4_count_free_clusters(sb)))
+                           (err == -ENOSPC && ext4_count_free_clusters(sb))) {
+                               if (progress)
+                                       goto update_disksize;
                                return err;
+                       }
                        ext4_msg(sb, KERN_CRIT,
                                 "Delayed block allocation failed for "
                                 "inode %lu at logical offset %llu with"
@@ -2111,15 +2115,17 @@ static int mpage_map_and_submit_extent(handle_t *handle,
                        *give_up_on_write = true;
                        return err;
                }
+               progress = 1;
                /*
                 * Update buffer state, submit mapped pages, and get us new
                 * extent to map
                 */
                err = mpage_map_and_submit_buffers(mpd);
                if (err < 0)
-                       return err;
+                       goto update_disksize;
        } while (map->m_len);
 
+update_disksize:
        /*
         * Update on-disk size after IO is submitted.  Races with
         * truncate are avoided by checking i_size under i_data_sem.