Commit 1ce01c4a authored Apr 10, 2014 by Namjae Jeon Committed by Theodore Ts'o Apr 10, 2014

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>

parent 87f7e416

fs/ext4/extents.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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)

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