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| author | J. Bruce Fields | 2018-11-15 17:21:40 +0100 |
|---|---|---|
| committer | J. Bruce Fields | 2018-11-27 22:23:12 +0100 |
| commit | fdec6114ee1f0f43b1ad081ad8d46b23ba126d70 (patch) | |
| tree | 36ab65a9e2983ac88d1662fbb207ceeba1a900d5 /fs | |
| parent | Linux 4.20-rc4 (diff) | |
| download | kernel-qcow2-linux-fdec6114ee1f0f43b1ad081ad8d46b23ba126d70.tar.gz kernel-qcow2-linux-fdec6114ee1f0f43b1ad081ad8d46b23ba126d70.tar.xz kernel-qcow2-linux-fdec6114ee1f0f43b1ad081ad8d46b23ba126d70.zip | |
nfsd4: zero-length WRITE should succeed
Zero-length writes are legal; from 5661 section 18.32.3: "If the count
is zero, the WRITE will succeed and return a count of zero subject to
permissions checking".
This check is unnecessary and is causing zero-length reads to return
EINVAL.
Cc: stable@vger.kernel.org
Fixes: 3fd9557aec91 "NFSD: Refactor the generic write vector fill helper"
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/nfs4proc.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index d505990dac7c..c364acbb6aba 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1016,8 +1016,6 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, nvecs = svc_fill_write_vector(rqstp, write->wr_pagelist, &write->wr_head, write->wr_buflen); - if (!nvecs) - return nfserr_io; WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec)); status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp, |