ext4: fix COLLAPSE_RANGE test failure in data journalling mode

When mounting ext4 with data=journal option, xfstest shared/002 and
shared/004 are currently failing as checksum computed for testfile
does not match with the checksum computed in other journal modes.
In case of data=journal mode, a call to filemap_write_and_wait_range
will not flush anything to disk as buffers are not marked dirty in
write_end. In collapse range this call is followed by a call to
truncate_pagecache_range. Due to this, when checksum is computed,
a portion of file is re-read from disk which replace valid data with
NULL bytes and hence the reason for the difference in checksum.

Calling ext4_force_commit before filemap_write_and_wait_range solves
the issue as it will mark the buffers dirty during commit transaction
which can be later synced by a call to filemap_write_and_wait_range.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 82df3ce9874a..be1e56cbbf32 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5383,6 +5383,13 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
         punch_start = offset >> EXT4_BLOCK_SIZE_BITS(sb);
         punch_stop = (offset + len) >> EXT4_BLOCK_SIZE_BITS(sb);
 
+        /* Call ext4_force_commit to flush all data in case of data=journal. */
+        if (ext4_should_journal_data(inode)) {
+                ret = ext4_force_commit(inode->i_sb);
+                if (ret)
+                        return ret;
+        }
+
         /* Write out all dirty pages */
         ret = filemap_write_and_wait_range(inode->i_mapping, offset, -1);
         if (ret)