[Cluster-devel] [PATCH AUTOSEL 5.9 16/21] gfs2: fix possible reference leak in gfs2_check_blk_type

[Cluster-devel] [PATCH AUTOSEL 5.9 16/21] gfs2: fix possible reference leak in gfs2_check_blk_type

[Sasha Levin]

From: Zhang Qilong <zhangqilong3@huawei.com>

[ Upstream commit bc923818b190c8b63c91a47702969c8053574f5b ]

In the fail path of gfs2_check_blk_type, forgetting to call
gfs2_glock_dq_uninit will result in rgd_gh reference leak.

Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/gfs2/rgrp.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 1bba5a9d45fa3..fc073cb729854 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -2530,13 +2530,13 @@ int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr, unsigned int type)
 
 	rbm.rgd = rgd;
 	error = gfs2_rbm_from_block(&rbm, no_addr);
-	if (WARN_ON_ONCE(error))
-		goto fail;
-
-	if (gfs2_testbit(&rbm, false) != type)
-		error = -ESTALE;
+	if (!WARN_ON_ONCE(error)) {
+		if (gfs2_testbit(&rbm, false) != type)
+			error = -ESTALE;
+	}
 
 	gfs2_glock_dq_uninit(&rgd_gh);
+
 fail:
 	return error;
 }
-- 
2.27.0

[Cluster-devel] [PATCH AUTOSEL 5.9 18/21] gfs2: Fix case in which ail writes are done to jdata holes

[Sasha Levin]

From: Bob Peterson <rpeterso@redhat.com>

[ Upstream commit 4e79e3f08e576acd51dffb4520037188703238b3 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/gfs2/aops.c | 2 +-
 fs/gfs2/log.c  | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index d4af283fc8886..317a47d49442b 100644
--- 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 93032feb51599..1ceeec0ffb16c 100644
--- 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;
-- 
2.27.0