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NFSD: Make nfsd4_setattr() wait before returning NFS4ERR_DELAY

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[ Upstream commit 34b91dda7124fc3259e4b2ae53e0c933dedfec01 ]

nfsd_setattr() can kick off a CB_RECALL (via
notify_change() -> break_lease()) if a delegation is present. Before
returning NFS4ERR_DELAY, give the client holding that delegation a
chance to return it and then retry the nfsd_setattr() again, once.

Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=354
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chuck Lever 2022-09-08 18:14:13 -04:00 committed by Greg Kroah-Hartman
parent f326970df1
commit b6c6c7153b
1 changed files with 8 additions and 1 deletions
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9
fs/nfsd/vfs.c
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@ -426,6 +426,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
int host_err;
bool get_write_count;
bool size_change = (iap->ia_valid & ATTR_SIZE);
int retries;
if (iap->ia_valid & ATTR_SIZE) {
accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
@ -480,7 +481,13 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
}
inode_lock(inode);
host_err = __nfsd_setattr(dentry, iap);
for (retries = 1;;) {
host_err = __nfsd_setattr(dentry, iap);
if (host_err != -EAGAIN || !retries--)
break;
if (!nfsd_wait_for_delegreturn(rqstp, inode))
break;
}
if (attr->na_seclabel && attr->na_seclabel->len)
attr->na_labelerr = security_inode_setsecctx(dentry,
attr->na_seclabel->data, attr->na_seclabel->len);