svn commit: r216815 - stable/8/sys/nfsserver
Pawel Jakub Dawidek
pjd at FreeBSD.org
Thu Dec 30 09:45:27 UTC 2010
Author: pjd
Date: Thu Dec 30 09:45:26 2010
New Revision: 216815
URL: http://svn.freebsd.org/changeset/base/216815
Log:
MFC r216565,r216631,r216632,r216633,r216774:
r216565:
Reduce lock scope a little.
r216631:
On error, unbusy file system and jump to the end, so we won't try to unlock
NULL *vpp.
Reviewed by: kib
r216632:
- Move pubflag and lockflag handling from nfsrv_fhtovp() to nfs_namei() -
this is the only place that is different from all the other nfsrv_fhtovp()
consumers.
This simplifies nfsrv_fhtovp() a bit and also eliminates one
vn_lock/VOP_UNLOCK() cycle in case of NFSv3.
- Implement NFSRV_FLAG_BUSY flag for nfsrv_fhtovp() that tells it to leave
mount point busy.
Reviewed by: kib
r216633:
Use newly added NFSRV_FLAG_BUSY flag for nfsrv_fhtovp() to keep mount point
busy. This fixes a race where we can pass invalid mount point to VFS_VGET()
via vp->v_mount when exported file system was forcibly unmounted between
nfsrv_fhtovp() and VFS_VGET().
Reviewed by: kib
r216774:
ZFS might not return monotonically increasing directory offset cookies,
so turn off UFS-specific hack that assumes so in ZFS case.
Before the change we can miss returning some directory entries to a
NFS client.
I believe that the hack should be moved to ufs_readdir(), but until we find
somebody who will do it, turn it off for ZFS in NFS server code.
Submitted by: rmacklem
Discussed with: rmacklem, mckusick
Modified:
stable/8/sys/nfsserver/nfs.h
stable/8/sys/nfsserver/nfs_serv.c
stable/8/sys/nfsserver/nfs_srvsubs.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
Modified: stable/8/sys/nfsserver/nfs.h
==============================================================================
--- stable/8/sys/nfsserver/nfs.h Thu Dec 30 09:32:39 2010 (r216814)
+++ stable/8/sys/nfsserver/nfs.h Thu Dec 30 09:45:26 2010 (r216815)
@@ -239,6 +239,12 @@ extern int nfs_debug;
#endif
+/*
+ * The following flags can be passed to nfsrv_fhtovp() function.
+ */
+/* Leave file system busy on success. */
+#define NFSRV_FLAG_BUSY 0x01
+
struct mbuf *nfs_rephead(int, struct nfsrv_descript *, int, struct mbuf **,
caddr_t *);
void nfsm_srvfattr(struct nfsrv_descript *, struct vattr *,
@@ -264,7 +270,7 @@ int nfsrv_create(struct nfsrv_descript *
struct mbuf **mrq);
int nfsrv_fhtovp(fhandle_t *, int, struct vnode **, int *,
struct nfsrv_descript *, struct nfssvc_sock *, struct sockaddr *,
- int *, int);
+ int *);
int nfsrv_setpublicfs(struct mount *, struct netexport *,
struct export_args *);
int nfs_ispublicfh(fhandle_t *);
Modified: stable/8/sys/nfsserver/nfs_serv.c
==============================================================================
--- stable/8/sys/nfsserver/nfs_serv.c Thu Dec 30 09:32:39 2010 (r216814)
+++ stable/8/sys/nfsserver/nfs_serv.c Thu Dec 30 09:45:26 2010 (r216815)
@@ -213,8 +213,7 @@ nfsrv3_access(struct nfsrv_descript *nfs
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED);
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(1, NULL);
@@ -280,8 +279,7 @@ nfsrv_getattr(struct nfsrv_descript *nfs
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam,
- &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (error) {
nfsm_reply(0);
error = 0;
@@ -389,8 +387,7 @@ nfsrv_setattr(struct nfsrv_descript *nfs
/*
* Now that we have all the fields, lets do it.
*/
- error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &tvfslocked, nfsd, slp, nam, &rdonly);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
@@ -712,8 +709,7 @@ nfsrv_readlink(struct nfsrv_descript *nf
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_td = NULL;
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
if (v3)
@@ -808,8 +804,7 @@ nfsrv_read(struct nfsrv_descript *nfsd,
* as well.
*/
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (error) {
vp = NULL;
nfsm_reply(2 * NFSX_UNSIGNED);
@@ -1109,8 +1104,7 @@ nfsrv_write(struct nfsrv_descript *nfsd,
error = 0;
goto nfsmout;
}
- error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &tvfslocked, nfsd, slp, nam, &rdonly);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
vp = NULL;
@@ -2102,8 +2096,7 @@ nfsrv_link(struct nfsrv_descript *nfsd,
nfsm_srvmtofh(dfhp);
nfsm_srvnamesiz(len);
- error = nfsrv_fhtovp(fhp, TRUE, &vp, &tvfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &tvfslocked, nfsd, slp, nam, &rdonly);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
@@ -2744,7 +2737,7 @@ nfsrv_readdir(struct nfsrv_descript *nfs
int v3 = (nfsd->nd_flag & ND_NFSV3);
u_quad_t off, toff, verf;
u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */
- int vfslocked;
+ int vfslocked, not_zfs;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
@@ -2770,8 +2763,7 @@ nfsrv_readdir(struct nfsrv_descript *nfs
if (siz > xfer)
siz = xfer;
fullsiz = siz;
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (!error && vp->v_type != VDIR) {
error = ENOTDIR;
vput(vp);
@@ -2809,6 +2801,7 @@ nfsrv_readdir(struct nfsrv_descript *nfs
error = 0;
goto nfsmout;
}
+ not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") != 0;
VOP_UNLOCK(vp, 0);
/*
@@ -2826,11 +2819,11 @@ again:
io.uio_rw = UIO_READ;
io.uio_td = NULL;
eofflag = 0;
- vn_lock(vp, LK_SHARED | LK_RETRY);
if (cookies) {
free((caddr_t)cookies, M_TEMP);
cookies = NULL;
}
+ vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies);
off = (off_t)io.uio_offset;
if (!cookies && !error)
@@ -2895,10 +2888,12 @@ again:
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
+ * Since the offset cookies don't monotonically increase for ZFS,
+ * this is not done when ZFS is the file system.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
- ((u_quad_t)(*cookiep)) <= toff)) {
+ (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
@@ -3044,9 +3039,12 @@ nfsrv_readdirplus(struct nfsrv_descript
int v3 = (nfsd->nd_flag & ND_NFSV3);
int usevget = 1, vfslocked;
struct componentname cn;
+ struct mount *mntp = NULL;
+ int not_zfs;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
+ vp_locked = 0;
if (!v3)
panic("nfsrv_readdirplus: v3 proc called on a v2 connection");
fhp = &nfh.fh_generic;
@@ -3066,14 +3064,17 @@ nfsrv_readdirplus(struct nfsrv_descript
if (siz > xfer)
siz = xfer;
fullsiz = siz;
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
- vp_locked = 1;
- if (!error && vp->v_type != VDIR) {
- error = ENOTDIR;
- vput(vp);
- vp = NULL;
- vp_locked = 0;
+ error = nfsrv_fhtovp(fhp, NFSRV_FLAG_BUSY, &vp, &vfslocked, nfsd, slp,
+ nam, &rdonly);
+ if (!error) {
+ vp_locked = 1;
+ mntp = vp->v_mount;
+ if (vp->v_type != VDIR) {
+ error = ENOTDIR;
+ vput(vp);
+ vp = NULL;
+ vp_locked = 0;
+ }
}
if (error) {
nfsm_reply(NFSX_UNSIGNED);
@@ -3100,6 +3101,7 @@ nfsrv_readdirplus(struct nfsrv_descript
error = 0;
goto nfsmout;
}
+ not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") != 0;
VOP_UNLOCK(vp, 0);
vp_locked = 0;
rbuf = malloc(siz, M_TEMP, M_WAITOK);
@@ -3114,12 +3116,12 @@ again:
io.uio_rw = UIO_READ;
io.uio_td = NULL;
eofflag = 0;
- vn_lock(vp, LK_SHARED | LK_RETRY);
vp_locked = 1;
if (cookies) {
free((caddr_t)cookies, M_TEMP);
cookies = NULL;
}
+ vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies);
off = (u_quad_t)io.uio_offset;
getret = VOP_GETATTR(vp, &at, cred);
@@ -3179,10 +3181,12 @@ again:
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
+ * Since the offset cookies don't monotonically increase for ZFS,
+ * this is not done when ZFS is the file system.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
- ((u_quad_t)(*cookiep)) <= toff)) {
+ (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
@@ -3215,8 +3219,8 @@ again:
* For readdir_and_lookup get the vnode using
* the file number.
*/
- error = VFS_VGET(vp->v_mount, dp->d_fileno,
- LK_SHARED, &nvp);
+ error = VFS_VGET(mntp, dp->d_fileno, LK_SHARED,
+ &nvp);
if (error != 0 && error != EOPNOTSUPP) {
error = 0;
goto invalid;
@@ -3375,6 +3379,8 @@ invalid:
nfsmout:
if (vp)
vrele(vp);
+ if (mntp)
+ vfs_unbusy(mntp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
@@ -3426,8 +3432,7 @@ nfsrv_commit(struct nfsrv_descript *nfsd
off = fxdr_hyper(tl);
tl += 2;
cnt = fxdr_unsigned(int, *tl);
- error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &tvfslocked, nfsd, slp, nam, &rdonly);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
@@ -3571,8 +3576,7 @@ nfsrv_statfs(struct nfsrv_descript *nfsd
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
if (v3)
@@ -3666,8 +3670,7 @@ nfsrv_fsinfo(struct nfsrv_descript *nfsd
fhp = &nfh.fh_generic;
vfslocked = 0;
nfsm_srvmtofh(fhp);
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
@@ -3741,8 +3744,7 @@ nfsrv_pathconf(struct nfsrv_descript *nf
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
- error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
- nam, &rdonly, TRUE);
+ error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp, nam, &rdonly);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
Modified: stable/8/sys/nfsserver/nfs_srvsubs.c
==============================================================================
--- stable/8/sys/nfsserver/nfs_srvsubs.c Thu Dec 30 09:32:39 2010 (r216814)
+++ stable/8/sys/nfsserver/nfs_srvsubs.c Thu Dec 30 09:45:26 2010 (r216815)
@@ -639,16 +639,18 @@ nfs_namei(struct nameidata *ndp, struct
goto out;
}
+ if (!pubflag && nfs_ispublicfh(fhp))
+ return (ESTALE);
+
/*
* Extract and set starting directory.
*/
- error = nfsrv_fhtovp(fhp, FALSE, &dp, &dvfslocked,
- nfsd, slp, nam, &rdonly, pubflag);
+ error = nfsrv_fhtovp(fhp, 0, &dp, &dvfslocked, nfsd, slp, nam, &rdonly);
if (error)
goto out;
vfslocked = VFS_LOCK_GIANT(dp->v_mount);
if (dp->v_type != VDIR) {
- vrele(dp);
+ vput(dp);
error = ENOTDIR;
goto out;
}
@@ -662,12 +664,12 @@ nfs_namei(struct nameidata *ndp, struct
*/
*retdirp = dp;
if (v3) {
- vn_lock(dp, LK_EXCLUSIVE | LK_RETRY);
*retdirattr_retp = VOP_GETATTR(dp, retdirattrp,
ndp->ni_cnd.cn_cred);
- VOP_UNLOCK(dp, 0);
}
+ VOP_UNLOCK(dp, 0);
+
if (pubflag) {
/*
* Oh joy. For WebNFS, handle those pesky '%' escapes,
@@ -1051,12 +1053,11 @@ nfsm_srvfattr(struct nfsrv_descript *nfs
* - look up fsid in mount list (if not found ret error)
* - get vp and export rights by calling VFS_FHTOVP()
* - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
- * - if not lockflag unlock it with VOP_UNLOCK()
*/
int
-nfsrv_fhtovp(fhandle_t *fhp, int lockflag, struct vnode **vpp, int *vfslockedp,
+nfsrv_fhtovp(fhandle_t *fhp, int flags, struct vnode **vpp, int *vfslockedp,
struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
- struct sockaddr *nam, int *rdonlyp, int pubflag)
+ struct sockaddr *nam, int *rdonlyp)
{
struct mount *mp;
int i;
@@ -1076,7 +1077,7 @@ nfsrv_fhtovp(fhandle_t *fhp, int lockfla
*vpp = NULL;
if (nfs_ispublicfh(fhp)) {
- if (!pubflag || !nfs_pub.np_valid)
+ if (!nfs_pub.np_valid)
return (ESTALE);
fhp = &nfs_pub.np_handle;
}
@@ -1128,12 +1129,12 @@ nfsrv_fhtovp(fhandle_t *fhp, int lockfla
}
}
error = VFS_FHTOVP(mp, &fhp->fh_fid, vpp);
- if (error != 0)
+ if (error) {
/* Make sure the server replies ESTALE to the client. */
error = ESTALE;
- vfs_unbusy(mp);
- if (error)
+ vfs_unbusy(mp);
goto out;
+ }
#ifdef MNT_EXNORESPORT
if (!(exflags & (MNT_EXNORESPORT|MNT_EXPUBLIC))) {
saddr = (struct sockaddr_in *)nam;
@@ -1144,6 +1145,8 @@ nfsrv_fhtovp(fhandle_t *fhp, int lockfla
vput(*vpp);
*vpp = NULL;
error = NFSERR_AUTHERR | AUTH_TOOWEAK;
+ vfs_unbusy(mp);
+ goto out;
}
}
#endif
@@ -1160,8 +1163,8 @@ nfsrv_fhtovp(fhandle_t *fhp, int lockfla
else
*rdonlyp = 0;
- if (!lockflag)
- VOP_UNLOCK(*vpp, 0);
+ if (!(flags & NFSRV_FLAG_BUSY))
+ vfs_unbusy(mp);
out:
if (credanon != NULL)
crfree(credanon);
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