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gfs2: fix infinite loop in gfs2_ail1_flush on io error

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Before this patch, an IO error encountered in function gfs2_ail1_flush
would cause a deadlock: because of the io error (and its resulting
withdrawn state), buffers stopped being written to the journal.
Buffers would remain on the ail1 list, so gfs2_ail1_start_one would
return 1 to indicate dirty buffers were still on the ail1 list.
However, when function gfs2_ail1_flush got a non-zero return code,
it would goto restart to retry the writes, which meant it would never
finish, and thus the infinite loop.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson 2019-11-14 09:52:54 -05:00 committed by Andreas Gruenbacher
parent eb43e660c0
commit f155f5e010
1 changed files with 2 additions and 1 deletions
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3
fs/gfs2/log.c
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@ -161,7 +161,8 @@ restart:
list_for_each_entry_reverse(tr, head, tr_list) {
if (wbc->nr_to_write <= 0)
break;
if (gfs2_ail1_start_one(sdp, wbc, tr, &withdraw))
if (gfs2_ail1_start_one(sdp, wbc, tr, &withdraw) &&
!gfs2_withdrawn(sdp))
goto restart;
}
spin_unlock(&sdp->sd_ail_lock);