[Cluster-devel] [PATCH] gfs2: Mark journal inodes as "don't cache"

[Bob Peterson]

Before this patch, journal inodes were considered regular inodes,
which meant that instead of evicting them, function iput_final would
just put them on the lru for later processing. If the file system
withdrew for whatever reason, the withdraw would never be seen until
the inode was evicted, which could be indefinitely.

This patch marks all journal inodes as "don't cache" which means
function iput_final will evict them immediately, allowing us to
properly recover the journal on other cluster nodes.

Signed-off-by: Bob Peterson <rpeterso at redhat.com>
---
 fs/gfs2/ops_fstype.c | 1 +
 fs/gfs2/util.c       | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 24ec449c034d..3ddb615c735d 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -614,6 +614,7 @@ static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 			break;
 		}
 
+		d_mark_dontcache(jd->jd_inode);
 		spin_lock(&sdp->sd_jindex_spin);
 		jd->jd_jid = sdp->sd_journals++;
 		jip = GFS2_I(jd->jd_inode);
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 34087bba88ee..cf345a86ef67 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -278,6 +278,7 @@ static void signal_our_withdraw(struct gfs2_sbd *sdp)
 		goto skip_recovery;
 	}
 	sdp->sd_jdesc->jd_inode = inode;
+	d_mark_dontcache(inode);
 
 	/*
 	 * Now wait until recovery is complete.
-- 
2.31.1