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-rw-r--r--fs/btrfs/ioctl.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 538f65a79ec5..dae5dfe41ba5 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1047,7 +1047,16 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
1047 if (!max_to_defrag) 1047 if (!max_to_defrag)
1048 max_to_defrag = last_index - 1; 1048 max_to_defrag = last_index - 1;
1049 1049
1050 while (i <= last_index && defrag_count < max_to_defrag) { 1050 /*
1051 * make writeback starts from i, so the defrag range can be
1052 * written sequentially.
1053 */
1054 if (i < inode->i_mapping->writeback_index)
1055 inode->i_mapping->writeback_index = i;
1056
1057 while (i <= last_index && defrag_count < max_to_defrag &&
1058 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1059 PAGE_CACHE_SHIFT)) {
1051 /* 1060 /*
1052 * make sure we stop running if someone unmounts 1061 * make sure we stop running if someone unmounts
1053 * the FS 1062 * the FS