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From: trondmy@kernel.org
To: linux-nfs@vger.kernel.org
Subject: [PATCH v2 6/7] NFS/pNFS: Don't leak DS commits in pnfs_generic_retry_commit()
Date: Thu,  7 Jan 2021 00:31:29 -0500
Message-ID: <20210107053130.20341-6-trondmy@kernel.org> (raw)
In-Reply-To: <20210107053130.20341-5-trondmy@kernel.org>

From: Trond Myklebust <trond.myklebust@hammerspace.com>

We must ensure that we pass a layout segment to nfs_retry_commit() when
we're cleaning up after pnfs_bucket_alloc_ds_commits(). Otherwise,
requests that should be committed to the DS will get committed to the
MDS.
Do so by ensuring that pnfs_bucket_get_committing() always tries to
return a layout segment when it returns a non-empty page list.

Fixes: c84bea59449a ("NFS/pNFS: Simplify bucket layout segment reference counting")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/pnfs_nfs.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index df20bbe8d15e..49d3389bd813 100644
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -403,12 +403,16 @@ pnfs_bucket_get_committing(struct list_head *head,
 			   struct pnfs_commit_bucket *bucket,
 			   struct nfs_commit_info *cinfo)
 {
+	struct pnfs_layout_segment *lseg;
 	struct list_head *pos;
 
 	list_for_each(pos, &bucket->committing)
 		cinfo->ds->ncommitting--;
 	list_splice_init(&bucket->committing, head);
-	return pnfs_free_bucket_lseg(bucket);
+	lseg = pnfs_free_bucket_lseg(bucket);
+	if (!lseg)
+		lseg = pnfs_get_lseg(bucket->lseg);
+	return lseg;
 }
 
 static struct nfs_commit_data *
@@ -420,8 +424,6 @@ pnfs_bucket_fetch_commitdata(struct pnfs_commit_bucket *bucket,
 	if (!data)
 		return NULL;
 	data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo);
-	if (!data->lseg)
-		data->lseg = pnfs_get_lseg(bucket->lseg);
 	return data;
 }
 
-- 
2.29.2


  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-07  5:31 [PATCH v2 1/7] pNFS: Mark layout for return if return-on-close was not sent trondmy
2021-01-07  5:31 ` [PATCH v2 2/7] pNFS: We want return-on-close to complete when evicting the inode trondmy
2021-01-07  5:31   ` [PATCH v2 3/7] pNFS: Clean up pnfs_layoutreturn_free_lsegs() trondmy
2021-01-07  5:31     ` [PATCH v2 4/7] pNFS: Stricter ordering of layoutget and layoutreturn trondmy
2021-01-07  5:31       ` [PATCH v2 5/7] NFS/pNFS: Don't call pnfs_free_bucket_lseg() before removing the request trondmy
2021-01-07  5:31         ` trondmy [this message]
2021-01-07  5:31           ` [PATCH v2 7/7] NFS/pNFS: Fix a leak of the layout 'plh_outstanding' counter trondmy

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