From: Trond Myklebust trond.myklebust@hammerspace.com
[ Upstream commit 474bc334698df98ce07c890f1898c7e7f389b0c7 ]
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 Tested-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: J. Bruce Fields bfields@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 1ecaceebee13..011cd570b50d 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1113,6 +1113,19 @@ out: }
#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. * @@ -1143,10 +1156,11 @@ 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,