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From:   trondmy@kernel.org
To:     Chuck Lever <chuck.lever@oracle.com>,
        "J. Bruce Fields" <bfields@redhat.com>
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH] nfsd: Reduce contention for the nfsd_file nf_rwsem
Date:   Thu, 17 Jun 2021 19:26:52 -0400
Message-Id: <20210617232652.264884-1-trondmy@kernel.org>
MIME-Version: 1.0
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From: Trond Myklebust <trond.myklebust@hammerspace.com>

When flushing out the unstable file writes as part of a COMMIT call, try
to perform most of of the data writes and waits outside the semaphore.

This means that if the client is sending the COMMIT as part of a memory
reclaim operation, then it can continue performing I/O, with contention
for the lock occurring only once the data sync is finished.

Fixes: 5011af4c698a ("nfsd: Fix stable writes")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfsd/vfs.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 15adf1f6ab21..46485c04740d 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1123,6 +1123,19 @@ nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset,
 }
 
 #ifdef CONFIG_NFSD_V3
+static int
+nfsd_filemap_write_and_wait_range(struct nfsd_file *nf, loff_t offset,
+				  loff_t end)
+{
+	struct address_space *mapping = nf->nf_file->f_mapping;
+	int ret = filemap_fdatawrite_range(mapping, offset, end);
+
+	if (ret)
+		return ret;
+	filemap_fdatawait_range_keep_errors(mapping, offset, end);
+	return 0;
+}
+
 /*
  * Commit all pending writes to stable storage.
  *
@@ -1153,10 +1166,11 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (err)
 		goto out;
 	if (EX_ISSYNC(fhp->fh_export)) {
-		int err2;
+		int err2 = nfsd_filemap_write_and_wait_range(nf, offset, end);
 
 		down_write(&nf->nf_rwsem);
-		err2 = vfs_fsync_range(nf->nf_file, offset, end, 0);
+		if (!err2)
+			err2 = vfs_fsync_range(nf->nf_file, offset, end, 0);
 		switch (err2) {
 		case 0:
 			nfsd_copy_boot_verifier(verf, net_generic(nf->nf_net,
-- 
2.31.1