plz ignore this patch. I will send it again.
Thanks.
2014-04-09 19:23 GMT+09:00, Namjae Jeon <namjae.jeon@xxxxxxxxxxx>:
> From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxx>
> Signed-off-by: Ashish Sangwan <a.sangwan@xxxxxxxxxxx>
> ---
> fs/ext4/extents.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index d7a78ed..ec1d9c4 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -5112,6 +5112,13 @@ 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)
> --
> 1.7.11-rc0
>
>
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