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- Move pubflag and lockflag handling from nfsrv_fhtovp() to nfs_namei() -

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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
MFC after:	5 days
This commit is contained in:
Pawel Jakub Dawidek 2010-12-21 23:12:45 +00:00
parent f2f1ef00be
commit 7ef95239a9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216632
3 changed files with 37 additions and 40 deletions
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8
sys/nfsserver/nfs.h
View File

@ -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 *nfsd, struct nfssvc_sock *slp,
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 *);

40
sys/nfsserver/nfs_serv.c
View File

@ -213,8 +213,7 @@ nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
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 *nfsd, struct nfssvc_sock *slp,
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 *nfsd, struct nfssvc_sock *slp,
/*
* 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 *nfsd, struct nfssvc_sock *slp,
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, struct nfssvc_sock *slp,
* 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, struct nfssvc_sock *slp,
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, struct nfssvc_sock *slp,
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));
@ -2770,8 +2763,7 @@ nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
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);
@ -3066,7 +3058,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
if (siz > xfer)
siz = xfer;
fullsiz = siz;
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
error = nfsrv_fhtovp(fhp, 0, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
vp_locked = 1;
if (!error && vp->v_type != VDIR) {
@ -3375,6 +3367,8 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
nfsmout:
if (vp)
vrele(vp);
if (mntp)
vfs_unbusy(mntp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
@ -3426,8 +3420,7 @@ nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
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 +3564,7 @@ nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
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 +3658,7 @@ nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
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 +3732,7 @@ nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
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);

29
sys/nfsserver/nfs_srvsubs.c
View File

@ -639,16 +639,18 @@ nfs_namei(struct nameidata *ndp, struct nfsrv_descript *nfsd,
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 nfsrv_descript *nfsd,
*/
*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 *nfsd, struct vattr *vap,
* - 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 lockflag, struct vnode **vpp, int *vfslockedp,
*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 lockflag, struct vnode **vpp, int *vfslockedp,
}
}
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;
@ -1162,8 +1163,8 @@ nfsrv_fhtovp(fhandle_t *fhp, int lockflag, struct vnode **vpp, int *vfslockedp,
else
*rdonlyp = 0;
if (!lockflag)
VOP_UNLOCK(*vpp, 0);
if (!(flags & NFSRV_FLAG_BUSY))
vfs_unbusy(mp);
out:
if (credanon != NULL)
crfree(credanon);