linux-kernel - Re: [PATCH v3 20/20] gfs2: clean up some filemap

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Date:   Mon, 24 Apr 2017 10:12:55 -0400 (EDT)
From:   Bob Peterson <rpeterso@...hat.com>
To:     Jeff Layton <jlayton@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-cifs@...r.kernel.org, linux-mm@...ck.org,
        jfs-discussion@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        cluster-devel@...hat.com, linux-f2fs-devel@...ts.sourceforge.net,
        v9fs-developer@...ts.sourceforge.net, osd-dev@...n-osd.org,
        linux-nilfs@...r.kernel.org, linux-block@...r.kernel.org,
        dhowells@...hat.com, akpm@...ux-foundation.org, hch@...radead.org,
        ross zwisler <ross.zwisler@...ux.intel.com>,
        mawilcox@...rosoft.com, jack@...e.com, viro@...iv.linux.org.uk,
        corbet@....net, neilb@...e.de, clm@...com, tytso@....edu,
        axboe@...nel.dk
Subject: Re: [PATCH v3 20/20] gfs2: clean up some filemap_* calls

----- Original Message -----
| In some places, it's trying to reset the mapping error after calling
| filemap_fdatawait. That's no longer required. Also, turn several
| filemap_fdatawrite+filemap_fdatawait calls into filemap_write_and_wait.
| That will at least return writeback errors that occur during the write
| phase.
| 
| Signed-off-by: Jeff Layton <jlayton@...hat.com>
| ---
|  fs/gfs2/glops.c | 12 ++++--------
|  fs/gfs2/lops.c  |  4 +---
|  fs/gfs2/super.c |  6 ++----
|  3 files changed, 7 insertions(+), 15 deletions(-)
| 
| diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
| index 5db59d444838..7362d19fdc4c 100644
| --- a/fs/gfs2/glops.c
| +++ b/fs/gfs2/glops.c
| @@ -158,9 +158,7 @@ static void rgrp_go_sync(struct gfs2_glock *gl)
|  	GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
|  
|  	gfs2_log_flush(sdp, gl, NORMAL_FLUSH);
| -	filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
| -	error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
| -	mapping_set_error(mapping, error);
| +	filemap_write_and_wait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);

This should probably have "error = ", no?

|  	gfs2_ail_empty_gl(gl);
|  
|  	spin_lock(&gl->gl_lockref.lock);
| @@ -225,12 +223,10 @@ static void inode_go_sync(struct gfs2_glock *gl)
|  	filemap_fdatawrite(metamapping);
|  	if (ip) {
|  		struct address_space *mapping = ip->i_inode.i_mapping;
| -		filemap_fdatawrite(mapping);
| -		error = filemap_fdatawait(mapping);
| -		mapping_set_error(mapping, error);
| +		filemap_write_and_wait(mapping);
| +	} else {
| +		filemap_fdatawait(metamapping);
|  	}
| -	error = filemap_fdatawait(metamapping);
| -	mapping_set_error(metamapping, error);

This part doesn't look right at all. There's a big difference in gfs2 between
mapping and metamapping. We need to wait for metamapping regardless.

(snip)

Regards,

Bob Peterson
Red Hat File Systems