Author: rmacklem
Date: Sun Apr 23 21:51:28 2017
New Revision: 317345
URL: https://svnweb.freebsd.org/changeset/base/317345
Log:
Make the NFSv4 client to use a write open for reading if allowed by the
server.
An NFSv4 server has the option of allowing a Read to be done using a Write
Open. If this is not allowed, the server will return NFSERR_OPENMODE.
This patch attempts the read with a write open and then disables this
if the server replies NFSERR_OPENMODE.
This change will avoid some uses of the special stateids. This will be
useful for pNFS/DS Reads, since they cannot use special stateids.
It will also be useful for any NFSv4 server that does not support reading
via the special stateids. It has been tested against both types of NFSv4
server.
MFC after: 2 weeks
Modified:
head/sys/fs/nfs/nfsport.h
head/sys/fs/nfsclient/nfs_clrpcops.c
head/sys/fs/nfsclient/nfs_clstate.c
Modified: head/sys/fs/nfs/nfsport.h
==============================================================================
--- head/sys/fs/nfs/nfsport.h Sun Apr 23 21:36:32 2017 (r317344)
+++ head/sys/fs/nfs/nfsport.h Sun Apr 23 21:51:28 2017 (r317345)
@@ -899,6 +899,7 @@ int newnfs_realign(struct mbuf **, int);
*/
#define NFSSTA_HASWRITEVERF 0x00040000 /* Has write verifier */
#define NFSSTA_GOTFSINFO 0x00100000 /* Got the fsinfo */
+#define NFSSTA_OPENMODE 0x00200000 /* Must use correct open
mode */
#define NFSSTA_NOLAYOUTCOMMIT 0x04000000 /* Don't do LayoutCommit */
#define NFSSTA_SESSPERSIST 0x08000000 /* Has a persistent session
*/
#define NFSSTA_TIMEO 0x10000000 /* Experiencing a timeout */
@@ -929,6 +930,7 @@ int newnfs_realign(struct mbuf **, int);
#define NFSHASNOLAYOUTCOMMIT(n) ((n)->nm_state & NFSSTA_NOLAYOUTCOMMIT)
#define NFSHASSESSPERSIST(n) ((n)->nm_state & NFSSTA_SESSPERSIST)
#define NFSHASPNFS(n) ((n)->nm_state & NFSSTA_PNFS)
+#define NFSHASOPENMODE(n) ((n)->nm_state & NFSSTA_OPENMODE)
#define NFSHASONEOPENOWN(n) (((n)->nm_flag & NFSMNT_ONEOPENOWN) !=
0 && \
(n)->nm_minorvers > 0)
Modified: head/sys/fs/nfsclient/nfs_clrpcops.c
==============================================================================
--- head/sys/fs/nfsclient/nfs_clrpcops.c Sun Apr 23 21:36:32 2017
(r317344)
+++ head/sys/fs/nfsclient/nfs_clrpcops.c Sun Apr 23 21:51:28 2017
(r317345)
@@ -1134,6 +1134,11 @@ nfsrpc_setattr(vnode_t vp, struct vattr
else
error = nfsrpc_setaclrpc(vp, cred, p, aclp, &stateid,
stuff);
+ if (error == NFSERR_OPENMODE && mode == NFSV4OPEN_ACCESSREAD) {
+ NFSLOCKMNT(nmp);
+ nmp->nm_state |= NFSSTA_OPENMODE;
+ NFSUNLOCKMNT(nmp);
+ }
if (error == NFSERR_STALESTATEID)
nfscl_initiate_recovery(nmp->nm_clp);
if (lckp != NULL)
@@ -1154,7 +1159,9 @@ nfsrpc_setattr(vnode_t vp, struct vattr
error == NFSERR_BADSESSION ||
(error == NFSERR_OLDSTATEID && retrycnt < 20) ||
((error == NFSERR_EXPIRED || error == NFSERR_BADSTATEID) &&
- expireret == 0 && clidrev != 0 && retrycnt < 4));
+ expireret == 0 && clidrev != 0 && retrycnt < 4) ||
+ (error == NFSERR_OPENMODE && mode == NFSV4OPEN_ACCESSREAD &&
+ retrycnt < 4));
if (error && retrycnt >= 4)
error = EIO;
return (error);
@@ -1391,6 +1398,11 @@ nfsrpc_read(vnode_t vp, struct uio *uiop
&lckp);
error = nfsrpc_readrpc(vp, uiop, newcred, &stateid, p, nap,
attrflagp, stuff);
+ if (error == NFSERR_OPENMODE) {
+ NFSLOCKMNT(nmp);
+ nmp->nm_state |= NFSSTA_OPENMODE;
+ NFSUNLOCKMNT(nmp);
+ }
if (error == NFSERR_STALESTATEID)
nfscl_initiate_recovery(nmp->nm_clp);
if (lckp != NULL)
@@ -1409,7 +1421,8 @@ nfsrpc_read(vnode_t vp, struct uio *uiop
error == NFSERR_BADSESSION ||
(error == NFSERR_OLDSTATEID && retrycnt < 20) ||
((error == NFSERR_EXPIRED || error == NFSERR_BADSTATEID) &&
- expireret == 0 && clidrev != 0 && retrycnt < 4));
+ expireret == 0 && clidrev != 0 && retrycnt < 4) ||
+ (error == NFSERR_OPENMODE && retrycnt < 4));
if (error && retrycnt >= 4)
error = EIO;
if (NFSHASNFSV4(nmp))
@@ -5594,6 +5607,11 @@ nfscl_doiods(vnode_t vp, struct uio *uio
if (lastbyte > layp->nfsly_lastbyte)
layp->nfsly_lastbyte = lastbyte;
NFSUNLOCKCLSTATE();
+ } else if (error == NFSERR_OPENMODE &&
+ rwaccess == NFSV4OPEN_ACCESSREAD) {
+ NFSLOCKMNT(nmp);
+ nmp->nm_state |= NFSSTA_OPENMODE;
+ NFSUNLOCKMNT(nmp);
}
} else
error = EIO;
Modified: head/sys/fs/nfsclient/nfs_clstate.c
==============================================================================
--- head/sys/fs/nfsclient/nfs_clstate.c Sun Apr 23 21:36:32 2017
(r317344)
+++ head/sys/fs/nfsclient/nfs_clstate.c Sun Apr 23 21:51:28 2017
(r317345)
@@ -500,10 +500,11 @@ nfscl_getstateid(vnode_t vp, u_int8_t *n
{
struct nfsclclient *clp;
struct nfsclowner *owp;
- struct nfsclopen *op = NULL;
+ struct nfsclopen *op = NULL, *top;
struct nfscllockowner *lp;
struct nfscldeleg *dp;
struct nfsnode *np;
+ struct nfsmount *nmp;
u_int8_t own[NFSV4CL_LOCKNAMELEN];
int error, done;
@@ -521,8 +522,9 @@ nfscl_getstateid(vnode_t vp, u_int8_t *n
if (vnode_vtype(vp) != VREG)
return (EISDIR);
np = VTONFS(vp);
+ nmp = VFSTONFS(vnode_mount(vp));
NFSLOCKCLSTATE();
- clp = nfscl_findcl(VFSTONFS(vnode_mount(vp)));
+ clp = nfscl_findcl(nmp);
if (clp == NULL) {
NFSUNLOCKCLSTATE();
return (EACCES);
@@ -592,23 +594,33 @@ nfscl_getstateid(vnode_t vp, u_int8_t *n
}
if (op == NULL) {
/* If not found, just look for any OpenOwner that will work. */
+ top = NULL;
done = 0;
owp = LIST_FIRST(&clp->nfsc_owner);
while (!done && owp != NULL) {
LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
if (op->nfso_fhlen == fhlen &&
- !NFSBCMP(op->nfso_fh, nfhp, fhlen) &&
- (mode & op->nfso_mode) == mode) {
- done = 1;
- break;
+ !NFSBCMP(op->nfso_fh, nfhp, fhlen)) {
+ if (top == NULL && (op->nfso_mode &
+ NFSV4OPEN_ACCESSWRITE) != 0 &&
+ (mode & NFSV4OPEN_ACCESSREAD) != 0)
+ top = op;
+ if ((mode & op->nfso_mode) == mode) {
+ done = 1;
+ break;
+ }
}
}
if (!done)
owp = LIST_NEXT(owp, nfsow_list);
}
if (!done) {
- NFSUNLOCKCLSTATE();
- return (ENOENT);
+ NFSCL_DEBUG(2, "openmode top=%p\n", top);
+ if (top == NULL || NFSHASOPENMODE(nmp)) {
+ NFSUNLOCKCLSTATE();
+ return (ENOENT);
+ } else
+ op = top;
}
/*
* For read aheads or write behinds, use the open cred.
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