On Tue 20-09-16 16:57:48, Josef Bacik wrote:

Now that we have metadata counters in the VM, we need to provide a way to kick
writeback on dirty metadata.  Introduce super_operations->write_metadata.  This
allows file systems to deal with writing back any dirty metadata we need based
on the writeback needs of the system.  Since there is no inode to key off of we
need a list in the bdi for dirty super blocks to be added.  From there we can
find any dirty sb's on the bdi we are currently doing writeback on and call into
their ->write_metadata callback.

Signed-off-by: Josef Bacik <redacted>
---
 fs/fs-writeback.c                | 72 ++++++++++++++++++++++++++++++++++++----
 fs/super.c                       |  7 ++++
 include/linux/backing-dev-defs.h |  2 ++
 include/linux/fs.h               |  4 +++
 mm/backing-dev.c                 |  2 ++
 5 files changed, 81 insertions(+), 6 deletions(-)

...

+	if (!done && sb->s_op->write_metadata) {
+		spin_unlock(&wb->list_lock);
+		wrote += writeback_sb_metadata(sb, wb, work);
+		spin_unlock(&wb->list_lock);

		^^^
		spin_lock();

Otherwise the patch looks good to me. So feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

after fixing the above.

								Honza

-- 
Jan Kara [off-list ref]
SUSE Labs, CR

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