gfs2: Fix case in which ail writes are done to jdata holes

Patch b2a846dbef4e ("gfs2: Ignore journal log writes for jdata holes")
tried (unsuccessfully) to fix a case in which writes were done to jdata
blocks, the blocks are sent to the ail list, then a punch_hole or truncate
operation caused the blocks to be freed. In other words, the ail items
are for jdata holes. Before b2a846dbef4e, the jdata hole caused function
gfs2_block_map to return -EIO, which was eventually interpreted as an
IO error to the journal, and then withdraw.

This patch changes function gfs2_get_block_noalloc, which is only used
for jdata writes, so it returns -ENODATA rather than -EIO, and when
-ENODATA is returned to gfs2_ail1_start_one, the error is ignored.
We can safely ignore it because gfs2_ail1_start_one is only called
when the jdata pages have already been written and truncated, so the
ail1 content no longer applies.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 9cd2eca..cc4f987 100644 (file)
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -77,7 +77,7 @@ static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
        if (error)
                return error;
        if (!buffer_mapped(bh_result))
-               return -EIO;
+               return -ENODATA;
        return 0;
 }
 

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 9133b31..2e93140 100644 (file)
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -132,6 +132,8 @@ __acquires(&sdp->sd_ail_lock)
                spin_unlock(&sdp->sd_ail_lock);
                ret = generic_writepages(mapping, wbc);
                spin_lock(&sdp->sd_ail_lock);
+               if (ret == -ENODATA) /* if a jdata write into a new hole */
+                       ret = 0; /* ignore it */
                if (ret || wbc->nr_to_write <= 0)
                        break;
                return -EBUSY;