ext4: fix mmap data corruption in nodelalloc mode when blocksize < pagesize

Since commit 90a8020 and d6320cb, Jan Kara has fixed this issue partially.
This mmap data corruption still exists in nodelalloc mode, fix this.

Signed-off-by: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by:   Jan Kara <jack@suse.cz>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5653fa42930b..4df6d01b762e 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1007,6 +1007,7 @@ static int ext4_write_end(struct file *file,
 {
         handle_t *handle = ext4_journal_current_handle();
         struct inode *inode = mapping->host;
+        loff_t old_size = inode->i_size;
         int ret = 0, ret2;
         int i_size_changed = 0;
 
@@ -1037,6 +1038,8 @@ static int ext4_write_end(struct file *file,
         unlock_page(page);
         page_cache_release(page);
 
+        if (old_size < pos)
+                pagecache_isize_extended(inode, old_size, pos);
         /*
          * Don't mark the inode dirty under page lock. First, it unnecessarily
          * makes the holding time of page lock longer. Second, it forces lock
@@ -1078,6 +1081,7 @@ static int ext4_journalled_write_end(struct file *file,
 {
         handle_t *handle = ext4_journal_current_handle();
         struct inode *inode = mapping->host;
+        loff_t old_size = inode->i_size;
         int ret = 0, ret2;
         int partial = 0;
         unsigned from, to;
@@ -1110,6 +1114,9 @@ static int ext4_journalled_write_end(struct file *file,
         unlock_page(page);
         page_cache_release(page);
 
+        if (old_size < pos)
+                pagecache_isize_extended(inode, old_size, pos);
+
         if (size_changed) {
                 ret2 = ext4_mark_inode_dirty(handle, inode);
                 if (!ret)