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freebsd-skq/sys/nfsserver/nfs_serv.c
Doug Rabson a9148abd9d Implement support for RPCSEC_GSS authentication to both the NFS client 
and server. This replaces the RPC implementation of the NFS client and
server with the newer RPC implementation originally developed
(actually ported from the userland sunrpc code) to support the NFS
Lock Manager.  I have tested this code extensively and I believe it is
stable and that performance is at least equal to the legacy RPC
implementation.

The NFS code currently contains support for both the new RPC
implementation and the older legacy implementation inherited from the
original NFS codebase. The default is to use the new implementation -
add the NFS_LEGACYRPC option to fall back to the old code. When I
merge this support back to RELENG_7, I will probably change this so
that users have to 'opt in' to get the new code.

To use RPCSEC_GSS on either client or server, you must build a kernel
which includes the KGSSAPI option and the crypto device. On the
userland side, you must build at least a new libc, mountd, mount_nfs
and gssd. You must install new versions of /etc/rc.d/gssd and
/etc/rc.d/nfsd and add 'gssd_enable=YES' to /etc/rc.conf.

As long as gssd is running, you should be able to mount an NFS
filesystem from a server that requires RPCSEC_GSS authentication. The
mount itself can happen without any kerberos credentials but all
access to the filesystem will be denied unless the accessing user has
a valid ticket file in the standard place (/tmp/krb5cc_<uid>). There
is currently no support for situations where the ticket file is in a
different place, such as when the user logged in via SSH and has
delegated credentials from that login. This restriction is also
present in Solaris and Linux. In theory, we could improve this in
future, possibly using Brooks Davis' implementation of variant
symlinks.

Supporting RPCSEC_GSS on a server is nearly as simple. You must create
service creds for the server in the form 'nfs/<fqdn>@<REALM>' and
install them in /etc/krb5.keytab. The standard heimdal utility ktutil
makes this fairly easy. After the service creds have been created, you
can add a '-sec=krb5' option to /etc/exports and restart both mountd
and nfsd.

The only other difference an administrator should notice is that nfsd
doesn't fork to create service threads any more. In normal operation,
there will be two nfsd processes, one in userland waiting for TCP
connections and one in the kernel handling requests. The latter
process will create as many kthreads as required - these should be
visible via 'top -H'. The code has some support for varying the number
of service threads according to load but initially at least, nfsd uses
a fixed number of threads according to the value supplied to its '-n'
option.

Sponsored by:	Isilon Systems
MFC after:	1 month
2008-11-03 10:38:00 +00:00

4298 lines
104 KiB
C
Raw Blame History

/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_serv.c 8.8 (Berkeley) 7/31/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* nfs version 2 and 3 server calls to vnode ops
* - these routines generally have 3 phases
* 1 - break down and validate rpc request in mbuf list
* 2 - do the vnode ops for the request
* (surprisingly ?? many are very similar to syscalls in vfs_syscalls.c)
* 3 - build the rpc reply in an mbuf list
* nb:
* - do not mix the phases, since the nfsm_?? macros can return failures
* on a bad rpc or similar and do not do any vrele() or vput()'s
*
* - the nfsm_reply() macro generates an nfs rpc reply with the nfs
* error number iff error != 0 whereas
* returning an error from the server function implies a fatal error
* such as a badly constructed rpc request that should be dropped without
* a reply.
* For nfsm_reply(), the case where error == EBADRPC is treated
* specially; after constructing a reply, it does an immediate
* `goto nfsmout' to avoid getting any V3 post-op status appended.
*
* Other notes:
* Warning: always pay careful attention to resource cleanup on return
* and note that nfsm_*() macros can terminate a procedure on certain
* errors.
*
* lookup() and namei()
* may return garbage in various structural fields/return elements
* if an error is returned, and may garbage up nd.ni_dvp even if no
* error is returned and you did not request LOCKPARENT or WANTPARENT.
*
* We use the ni_cnd.cn_flags 'HASBUF' flag to track whether the name
* buffer has been freed or not.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/dirent.h>
#include <sys/stat.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <nfs/nfsproto.h>
#include <nfs/rpcv2.h>
#include <nfsserver/nfs.h>
#include <nfs/xdr_subs.h>
#include <nfsserver/nfsm_subs.h>
#ifdef NFSRV_DEBUG
#define nfsdbprintf(info) printf info
#else
#define nfsdbprintf(info)
#endif
#define MAX_COMMIT_COUNT (1024 * 1024)
#define NUM_HEURISTIC 1017
#define NHUSE_INIT 64
#define NHUSE_INC 16
#define NHUSE_MAX 2048
static struct nfsheur {
struct vnode *nh_vp; /* vp to match (unreferenced pointer) */
off_t nh_nextr; /* next offset for sequential detection */
int nh_use; /* use count for selection */
int nh_seqcount; /* heuristic */
} nfsheur[NUM_HEURISTIC];
/* Global vars */
int nfsrvw_procrastinate = NFS_GATHERDELAY * 1000;
int nfsrvw_procrastinate_v3 = 0;
static struct timeval nfsver = { 0 };
SYSCTL_NODE(_vfs, OID_AUTO, nfsrv, CTLFLAG_RW, 0, "NFS server");
static int nfs_async;
static int nfs_commit_blks;
static int nfs_commit_miss;
SYSCTL_INT(_vfs_nfsrv, OID_AUTO, async, CTLFLAG_RW, &nfs_async, 0,
"Tell client that writes were synced even though they were not");
SYSCTL_INT(_vfs_nfsrv, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks, 0,
"Number of completed commits");
SYSCTL_INT(_vfs_nfsrv, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss, 0, "");
struct nfsrvstats nfsrvstats;
SYSCTL_STRUCT(_vfs_nfsrv, NFS_NFSRVSTATS, nfsrvstats, CTLFLAG_RW,
&nfsrvstats, nfsrvstats, "S,nfsrvstats");
static int nfsrv_access(struct vnode *, accmode_t, struct ucred *,
int, int);
#ifdef NFS_LEGACYRPC
static void nfsrvw_coalesce(struct nfsrv_descript *,
struct nfsrv_descript *);
#endif
/*
* Clear nameidata fields that are tested in nsfmout cleanup code prior
* to using first nfsm macro (that might jump to the cleanup code).
*/
static __inline void
ndclear(struct nameidata *nd)
{
nd->ni_cnd.cn_flags = 0;
nd->ni_vp = NULL;
nd->ni_dvp = NULL;
nd->ni_startdir = NULL;
}
/*
* Takes two vfslocked integers and returns with at most one
* reference to giant. The return value indicates whether giant
* is held by either lock. This simplifies nfsrv ops by allowing
* them to track only one vfslocked var.
*/
static __inline int
nfsrv_lockedpair(int vfs1, int vfs2)
{
if (vfs1 && vfs2)
VFS_UNLOCK_GIANT(vfs2);
return (vfs1 | vfs2);
}
static __inline int
nfsrv_lockedpair_nd(int vfs1, struct nameidata *nd)
{
int vfs2;
vfs2 = NDHASGIANT(nd);
return nfsrv_lockedpair(vfs1, vfs2);
}
/*
* nfs v3 access service
*/
int
nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct vnode *vp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
u_int32_t *tl;
caddr_t bpos;
int error = 0, rdonly, getret;
struct mbuf *mb, *mreq;
struct vattr vattr, *vap = &vattr;
u_long testmode, nfsmode;
int v3 = (nfsd->nd_flag & ND_NFSV3);
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
if (!v3)
panic("nfsrv3_access: v3 proc called on a v2 connection");
vfslocked = 0;
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);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(1, NULL);
error = 0;
goto nfsmout;
}
nfsmode = fxdr_unsigned(u_int32_t, *tl);
if ((nfsmode & NFSV3ACCESS_READ) &&
nfsrv_access(vp, VREAD, cred, rdonly, 0))
nfsmode &= ~NFSV3ACCESS_READ;
if (vp->v_type == VDIR)
testmode = (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
NFSV3ACCESS_DELETE);
else
testmode = (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
if ((nfsmode & testmode) &&
nfsrv_access(vp, VWRITE, cred, rdonly, 0))
nfsmode &= ~testmode;
if (vp->v_type == VDIR)
testmode = NFSV3ACCESS_LOOKUP;
else
testmode = NFSV3ACCESS_EXECUTE;
if ((nfsmode & testmode) &&
nfsrv_access(vp, VEXEC, cred, rdonly, 0))
nfsmode &= ~testmode;
getret = VOP_GETATTR(vp, vap, cred);
vput(vp);
vp = NULL;
nfsm_reply(NFSX_POSTOPATTR(1) + NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, vap);
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(nfsmode);
nfsmout:
if (vp)
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs getattr service
*/
int
nfsrv_getattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct nfs_fattr *fp;
struct vattr va;
struct vattr *vap = &va;
struct vnode *vp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
caddr_t bpos;
int error = 0, rdonly;
struct mbuf *mb, *mreq;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam,
&rdonly, TRUE);
if (error) {
nfsm_reply(0);
error = 0;
goto nfsmout;
}
error = VOP_GETATTR(vp, vap, cred);
vput(vp);
vp = NULL;
nfsm_reply(NFSX_FATTR(nfsd->nd_flag & ND_NFSV3));
if (error) {
error = 0;
goto nfsmout;
}
fp = nfsm_build(struct nfs_fattr *,
NFSX_FATTR(nfsd->nd_flag & ND_NFSV3));
nfsm_srvfillattr(vap, fp);
/* fall through */
nfsmout:
if (vp)
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs setattr service
*/
int
nfsrv_setattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct vattr va, preat;
struct vattr *vap = &va;
struct nfsv2_sattr *sp;
struct nfs_fattr *fp;
struct vnode *vp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
u_int32_t *tl;
caddr_t bpos;
int error = 0, rdonly, preat_ret = 1, postat_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3), gcheck = 0;
struct mbuf *mb, *mreq;
struct timespec guard = { 0, 0 };
struct mount *mp = NULL;
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto out;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
VATTR_NULL(vap);
if (v3) {
nfsm_srvsattr(vap);
tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED);
gcheck = fxdr_unsigned(int, *tl);
if (gcheck) {
tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED);
fxdr_nfsv3time(tl, &guard);
}
} else {
sp = nfsm_dissect_nonblock(struct nfsv2_sattr *, NFSX_V2SATTR);
/*
* Nah nah nah nah na nah
* There is a bug in the Sun client that puts 0xffff in the mode
* field of sattr when it should put in 0xffffffff. The u_short
* doesn't sign extend.
* --> check the low order 2 bytes for 0xffff
*/
if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
vap->va_mode = nfstov_mode(sp->sa_mode);
if (sp->sa_uid != nfsrv_nfs_xdrneg1)
vap->va_uid = fxdr_unsigned(uid_t, sp->sa_uid);
if (sp->sa_gid != nfsrv_nfs_xdrneg1)
vap->va_gid = fxdr_unsigned(gid_t, sp->sa_gid);
if (sp->sa_size != nfsrv_nfs_xdrneg1)
vap->va_size = fxdr_unsigned(u_quad_t, sp->sa_size);
if (sp->sa_atime.nfsv2_sec != nfsrv_nfs_xdrneg1) {
#ifdef notyet
fxdr_nfsv2time(&sp->sa_atime, &vap->va_atime);
#else
vap->va_atime.tv_sec =
fxdr_unsigned(int32_t, sp->sa_atime.nfsv2_sec);
vap->va_atime.tv_nsec = 0;
#endif
}
if (sp->sa_mtime.nfsv2_sec != nfsrv_nfs_xdrneg1)
fxdr_nfsv2time(&sp->sa_mtime, &vap->va_mtime);
}
/*
* Now that we have all the fields, lets do it.
*/
error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp,
nam, &rdonly, TRUE);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
if (v3)
nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap);
error = 0;
goto nfsmout;
}
/*
* vp now an active resource, pay careful attention to cleanup
*/
if (v3) {
error = preat_ret = VOP_GETATTR(vp, &preat, cred);
if (!error && gcheck &&
(preat.va_ctime.tv_sec != guard.tv_sec ||
preat.va_ctime.tv_nsec != guard.tv_nsec))
error = NFSERR_NOT_SYNC;
if (error) {
vput(vp);
vp = NULL;
nfsm_reply(NFSX_WCCDATA(v3));
if (v3)
nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap);
error = 0;
goto nfsmout;
}
}
/*
* If the size is being changed write acces is required, otherwise
* just check for a read only filesystem.
*/
if (vap->va_size == ((u_quad_t)((quad_t) -1))) {
if (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) {
error = EROFS;
goto out;
}
} else {
if (vp->v_type == VDIR) {
error = EISDIR;
goto out;
} else if ((error = nfsrv_access(vp, VWRITE, cred, rdonly,
0)) != 0)
goto out;
}
error = VOP_SETATTR(vp, vap, cred);
postat_ret = VOP_GETATTR(vp, vap, cred);
if (!error)
error = postat_ret;
out:
if (vp != NULL)
vput(vp);
vp = NULL;
nfsm_reply(NFSX_WCCORFATTR(v3));
if (v3) {
nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap);
} else if (!error) {
/* v2 non-error case. */
fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(vap, fp);
}
error = 0;
/* fall through */
nfsmout:
if (vp)
vput(vp);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs lookup rpc
*/
int
nfsrv_lookup(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct nfs_fattr *fp;
struct nameidata nd, ind, *ndp = &nd;
struct vnode *vp, *dirp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
caddr_t bpos;
int error = 0, len, dirattr_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3), pubflag;
struct mbuf *mb, *mreq;
struct vattr va, dirattr, *vap = &va;
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
ndclear(&nd);
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvnamesiz(len);
pubflag = nfs_ispublicfh(fhp);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = LOOKUP;
nd.ni_cnd.cn_flags = LOCKLEAF | SAVESTART | MPSAFE;
error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirattr, &dirattr_ret, pubflag);
vfslocked = NDHASGIANT(&nd);
/*
* namei failure, only dirp to cleanup. Clear out garbarge from
* structure in case macros jump to nfsmout.
*/
if (error) {
if (dirp) {
vrele(dirp);
dirp = NULL;
}
nfsm_reply(NFSX_POSTOPATTR(v3));
if (v3)
nfsm_srvpostop_attr(dirattr_ret, &dirattr);
error = 0;
goto nfsmout;
}
/*
* Locate index file for public filehandle
*
* error is 0 on entry and 0 on exit from this block.
*/
if (pubflag) {
if (nd.ni_vp->v_type == VDIR && nfs_pub.np_index != NULL) {
/*
* Setup call to lookup() to see if we can find
* the index file. Arguably, this doesn't belong
* in a kernel.. Ugh. If an error occurs, do not
* try to install an index file and then clear the
* error.
*
* When we replace nd with ind and redirect ndp,
* maintenance of ni_startdir and ni_vp shift to
* ind and we have to clean them up in the old nd.
* However, the cnd resource continues to be maintained
* via the original nd. Confused? You aren't alone!
*/
ind = nd;
VOP_UNLOCK(nd.ni_vp, 0);
ind.ni_pathlen = strlen(nfs_pub.np_index);
ind.ni_cnd.cn_nameptr = ind.ni_cnd.cn_pnbuf =
nfs_pub.np_index;
ind.ni_startdir = nd.ni_vp;
VREF(ind.ni_startdir);
ind.ni_cnd.cn_flags &= ~GIANTHELD;
tvfslocked = VFS_LOCK_GIANT(ind.ni_startdir->v_mount);
if (tvfslocked)
nd.ni_cnd.cn_flags |= GIANTHELD;
error = lookup(&ind);
ind.ni_dvp = NULL;
vfslocked = nfsrv_lockedpair_nd(vfslocked, &ind);
ind.ni_cnd.cn_flags &= ~GIANTHELD;
if (error == 0) {
/*
* Found an index file. Get rid of
* the old references. transfer nd.ni_vp'
*/
if (dirp)
vrele(dirp);
dirp = nd.ni_vp;
nd.ni_vp = NULL;
vrele(nd.ni_startdir);
nd.ni_startdir = NULL;
ndp = &ind;
}
error = 0;
}
/*
* If the public filehandle was used, check that this lookup
* didn't result in a filehandle outside the publicly exported
* filesystem. We clear the poor vp here to avoid lockups due
* to NFS I/O.
*/
if (ndp->ni_vp->v_mount != nfs_pub.np_mount) {
vput(nd.ni_vp);
nd.ni_vp = NULL;
error = EPERM;
}
}
/*
* Resources at this point:
* ndp->ni_vp may not be NULL
*/
if (error) {
nfsm_reply(NFSX_POSTOPATTR(v3));
if (v3)
nfsm_srvpostop_attr(dirattr_ret, &dirattr);
error = 0;
goto nfsmout;
}
/*
* Get underlying attribute, then release remaining resources ( for
* the same potential blocking reason ) and reply.
*/
vp = ndp->ni_vp;
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VOP_VPTOFH(vp, &fhp->fh_fid);
if (!error)
error = VOP_GETATTR(vp, vap, cred);
vput(vp);
vrele(ndp->ni_startdir);
vrele(dirp);
ndp->ni_vp = NULL;
ndp->ni_startdir = NULL;
dirp = NULL;
nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPORFATTR(v3) + NFSX_POSTOPATTR(v3));
if (error) {
if (v3)
nfsm_srvpostop_attr(dirattr_ret, &dirattr);
error = 0;
goto nfsmout;
}
nfsm_srvfhtom(fhp, v3);
if (v3) {
nfsm_srvpostop_attr(0, vap);
nfsm_srvpostop_attr(dirattr_ret, &dirattr);
} else {
fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(vap, fp);
}
nfsmout:
if (ndp->ni_vp || dirp || ndp->ni_startdir) {
if (ndp->ni_vp)
vput(ndp->ni_vp);
if (dirp)
vrele(dirp);
if (ndp->ni_startdir)
vrele(ndp->ni_startdir);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* nfs readlink service
*/
int
nfsrv_readlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
struct iovec *ivp = iv;
struct mbuf *mp;
u_int32_t *tl;
caddr_t bpos;
int error = 0, rdonly, i, tlen, len, getret;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mp3, *nmp, *mreq;
struct vnode *vp = NULL;
struct vattr attr;
nfsfh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
#ifndef nolint
mp = NULL;
#endif
mp3 = NULL;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
len = 0;
i = 0;
while (len < NFS_MAXPATHLEN) {
MGET(nmp, M_WAIT, MT_DATA);
MCLGET(nmp, M_WAIT);
nmp->m_len = NFSMSIZ(nmp);
if (len == 0)
mp3 = mp = nmp;
else {
mp->m_next = nmp;
mp = nmp;
}
if ((len + mp->m_len) > NFS_MAXPATHLEN) {
mp->m_len = NFS_MAXPATHLEN - len;
len = NFS_MAXPATHLEN;
} else
len += mp->m_len;
ivp->iov_base = mtod(mp, caddr_t);
ivp->iov_len = mp->m_len;
i++;
ivp++;
}
uiop->uio_iov = iv;
uiop->uio_iovcnt = i;
uiop->uio_offset = 0;
uiop->uio_resid = len;
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);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
if (v3)
nfsm_srvpostop_attr(1, NULL);
error = 0;
goto nfsmout;
}
if (vp->v_type != VLNK) {
if (v3)
error = EINVAL;
else
error = ENXIO;
} else
error = VOP_READLINK(vp, uiop, cred);
getret = VOP_GETATTR(vp, &attr, cred);
vput(vp);
vp = NULL;
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_UNSIGNED);
if (v3)
nfsm_srvpostop_attr(getret, &attr);
if (error) {
error = 0;
goto nfsmout;
}
if (uiop->uio_resid > 0) {
len -= uiop->uio_resid;
tlen = nfsm_rndup(len);
nfsm_adj(mp3, NFS_MAXPATHLEN-tlen, tlen-len);
}
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(len);
mb->m_next = mp3;
mp3 = NULL;
nfsmout:
if (mp3)
m_freem(mp3);
if (vp)
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs read service
*/
int
nfsrv_read(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct iovec *iv;
struct iovec *iv2;
struct mbuf *m;
struct nfs_fattr *fp;
u_int32_t *tl;
int i;
caddr_t bpos;
int error = 0, rdonly, cnt, len, left, siz, tlen, getret;
int v3 = (nfsd->nd_flag & ND_NFSV3), reqlen;
struct mbuf *mb, *mreq;
struct mbuf *m2;
struct vnode *vp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
struct vattr va, *vap = &va;
struct nfsheur *nh;
off_t off;
int ioflag = 0;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if (v3) {
tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED);
off = fxdr_hyper(tl);
} else {
tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED);
off = (off_t)fxdr_unsigned(u_int32_t, *tl);
}
nfsm_srvstrsiz(reqlen, NFS_SRVMAXDATA(nfsd));
/*
* Reference vp. If an error occurs, vp will be invalid, but we
* have to NULL it just in case. The macros might goto nfsmout
* as well.
*/
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
if (error) {
vp = NULL;
nfsm_reply(2 * NFSX_UNSIGNED);
if (v3)
nfsm_srvpostop_attr(1, NULL);
error = 0;
goto nfsmout;
}
if (vp->v_type != VREG) {
if (v3)
error = EINVAL;
else
error = (vp->v_type == VDIR) ? EISDIR : EACCES;
}
if (!error) {
if ((error = nfsrv_access(vp, VREAD, cred, rdonly, 1)) != 0)
error = nfsrv_access(vp, VEXEC, cred, rdonly, 1);
}
getret = VOP_GETATTR(vp, vap, cred);
if (!error)
error = getret;
if (error) {
vput(vp);
vp = NULL;
nfsm_reply(NFSX_POSTOPATTR(v3));
if (v3)
nfsm_srvpostop_attr(getret, vap);
error = 0;
goto nfsmout;
}
/*
* Calculate byte count to read
*/
if (off >= vap->va_size)
cnt = 0;
else if ((off + reqlen) > vap->va_size)
cnt = vap->va_size - off;
else
cnt = reqlen;
/*
* Calculate seqcount for heuristic
*/
{
int hi;
int try = 32;
/*
* Locate best candidate
*/
hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
nh = &nfsheur[hi];
while (try--) {
if (nfsheur[hi].nh_vp == vp) {
nh = &nfsheur[hi];
break;
}
if (nfsheur[hi].nh_use > 0)
--nfsheur[hi].nh_use;
hi = (hi + 1) % NUM_HEURISTIC;
if (nfsheur[hi].nh_use < nh->nh_use)
nh = &nfsheur[hi];
}
if (nh->nh_vp != vp) {
nh->nh_vp = vp;
nh->nh_nextr = off;
nh->nh_use = NHUSE_INIT;
if (off == 0)
nh->nh_seqcount = 4;
else
nh->nh_seqcount = 1;
}
/*
* Calculate heuristic
*/
if ((off == 0 && nh->nh_seqcount > 0) || off == nh->nh_nextr) {
if (++nh->nh_seqcount > IO_SEQMAX)
nh->nh_seqcount = IO_SEQMAX;
} else if (nh->nh_seqcount > 1) {
nh->nh_seqcount = 1;
} else {
nh->nh_seqcount = 0;
}
nh->nh_use += NHUSE_INC;
if (nh->nh_use > NHUSE_MAX)
nh->nh_use = NHUSE_MAX;
ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
}
nfsm_reply(NFSX_POSTOPORFATTR(v3) + 3 * NFSX_UNSIGNED+nfsm_rndup(cnt));
if (v3) {
tl = nfsm_build(u_int32_t *, NFSX_V3FATTR + 4 * NFSX_UNSIGNED);
*tl++ = nfsrv_nfs_true;
fp = (struct nfs_fattr *)tl;
tl += (NFSX_V3FATTR / sizeof (u_int32_t));
} else {
tl = nfsm_build(u_int32_t *, NFSX_V2FATTR + NFSX_UNSIGNED);
fp = (struct nfs_fattr *)tl;
tl += (NFSX_V2FATTR / sizeof (u_int32_t));
}
len = left = nfsm_rndup(cnt);
if (cnt > 0) {
/*
* Generate the mbuf list with the uio_iov ref. to it.
*/
i = 0;
m = m2 = mb;
while (left > 0) {
siz = min(M_TRAILINGSPACE(m), left);
if (siz > 0) {
left -= siz;
i++;
}
if (left > 0) {
MGET(m, M_WAIT, MT_DATA);
MCLGET(m, M_WAIT);
m->m_len = 0;
m2->m_next = m;
m2 = m;
}
}
iv = malloc(i * sizeof (struct iovec),
M_TEMP, M_WAITOK);
uiop->uio_iov = iv2 = iv;
m = mb;
left = len;
i = 0;
while (left > 0) {
if (m == NULL)
panic("nfsrv_read iov");
siz = min(M_TRAILINGSPACE(m), left);
if (siz > 0) {
iv->iov_base = mtod(m, caddr_t) + m->m_len;
iv->iov_len = siz;
m->m_len += siz;
left -= siz;
iv++;
i++;
}
m = m->m_next;
}
uiop->uio_iovcnt = i;
uiop->uio_offset = off;
uiop->uio_resid = len;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
off = uiop->uio_offset;
nh->nh_nextr = off;
free((caddr_t)iv2, M_TEMP);
if (error || (getret = VOP_GETATTR(vp, vap, cred))) {
if (!error)
error = getret;
m_freem(mreq);
vput(vp);
vp = NULL;
nfsm_reply(NFSX_POSTOPATTR(v3));
if (v3)
nfsm_srvpostop_attr(getret, vap);
error = 0;
goto nfsmout;
}
} else
uiop->uio_resid = 0;
vput(vp);
vp = NULL;
nfsm_srvfillattr(vap, fp);
tlen = len - uiop->uio_resid;
cnt = cnt < tlen ? cnt : tlen;
tlen = nfsm_rndup(cnt);
if (len != tlen || tlen != cnt)
nfsm_adj(mb, len - tlen, tlen - cnt);
if (v3) {
*tl++ = txdr_unsigned(cnt);
if (cnt < reqlen)
*tl++ = nfsrv_nfs_true;
else
*tl++ = nfsrv_nfs_false;
}
*tl = txdr_unsigned(cnt);
nfsmout:
if (vp)
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs write service
*/
int
nfsrv_write(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct iovec *ivp;
int i, cnt;
struct mbuf *mp;
struct nfs_fattr *fp;
struct iovec *iv;
struct vattr va, forat;
struct vattr *vap = &va;
u_int32_t *tl;
caddr_t bpos;
int error = 0, rdonly, len, forat_ret = 1;
int ioflags, aftat_ret = 1, retlen = 0, zeroing, adjust;
int stable = NFSV3WRITE_FILESYNC;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct vnode *vp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
off_t off;
struct mount *mntp = NULL;
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
if (mrep == NULL) {
*mrq = NULL;
error = 0;
goto nfsmout;
}
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mntp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto ereply;
}
vfslocked = VFS_LOCK_GIANT(mntp);
(void) vn_start_write(NULL, &mntp, V_WAIT);
vfs_rel(mntp); /* The write holds a ref. */
if (v3) {
tl = nfsm_dissect_nonblock(u_int32_t *, 5 * NFSX_UNSIGNED);
off = fxdr_hyper(tl);
tl += 3;
stable = fxdr_unsigned(int, *tl++);
} else {
tl = nfsm_dissect_nonblock(u_int32_t *, 4 * NFSX_UNSIGNED);
off = (off_t)fxdr_unsigned(u_int32_t, *++tl);
tl += 2;
if (nfs_async)
stable = NFSV3WRITE_UNSTABLE;
}
retlen = len = fxdr_unsigned(int32_t, *tl);
cnt = i = 0;
/*
* For NFS Version 2, it is not obvious what a write of zero length
* should do, but I might as well be consistent with Version 3,
* which is to return ok so long as there are no permission problems.
*/
if (len > 0) {
zeroing = 1;
mp = mrep;
while (mp) {
if (mp == md) {
zeroing = 0;
adjust = dpos - mtod(mp, caddr_t);
mp->m_len -= adjust;
if (mp->m_len > 0 && adjust > 0)
mp->m_data += adjust;
}
if (zeroing)
mp->m_len = 0;
else if (mp->m_len > 0) {
i += mp->m_len;
if (i > len) {
mp->m_len -= (i - len);
zeroing = 1;
}
if (mp->m_len > 0)
cnt++;
}
mp = mp->m_next;
}
}
if (len > NFS_MAXDATA || len < 0 || i < len) {
error = EIO;
nfsm_reply(2 * NFSX_UNSIGNED);
if (v3)
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
error = 0;
goto nfsmout;
}
error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp,
nam, &rdonly, TRUE);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
vp = NULL;
nfsm_reply(2 * NFSX_UNSIGNED);
if (v3)
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
error = 0;
goto nfsmout;
}
if (v3)
forat_ret = VOP_GETATTR(vp, &forat, cred);
if (vp->v_type != VREG) {
if (v3)
error = EINVAL;
else
error = (vp->v_type == VDIR) ? EISDIR : EACCES;
}
if (!error)
error = nfsrv_access(vp, VWRITE, cred, rdonly, 1);
if (error) {
vput(vp);
vp = NULL;
nfsm_reply(NFSX_WCCDATA(v3));
if (v3)
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
error = 0;
goto nfsmout;
}
if (len > 0) {
ivp = malloc(cnt * sizeof (struct iovec), M_TEMP,
M_WAITOK);
uiop->uio_iov = iv = ivp;
uiop->uio_iovcnt = cnt;
mp = mrep;
while (mp) {
if (mp->m_len > 0) {
ivp->iov_base = mtod(mp, caddr_t);
ivp->iov_len = mp->m_len;
ivp++;
}
mp = mp->m_next;
}
/*
* XXX
* The IO_METASYNC flag indicates that all metadata (and not just
* enough to ensure data integrity) mus be written to stable storage
* synchronously.
* (IO_METASYNC is not yet implemented in 4.4BSD-Lite.)
*/
if (stable == NFSV3WRITE_UNSTABLE)
ioflags = IO_NODELOCKED;
else if (stable == NFSV3WRITE_DATASYNC)
ioflags = (IO_SYNC | IO_NODELOCKED);
else
ioflags = (IO_METASYNC | IO_SYNC | IO_NODELOCKED);
uiop->uio_resid = len;
uiop->uio_rw = UIO_WRITE;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_td = NULL;
uiop->uio_offset = off;
error = VOP_WRITE(vp, uiop, ioflags, cred);
/* Unlocked write. */
nfsrvstats.srvvop_writes++;
free((caddr_t)iv, M_TEMP);
}
aftat_ret = VOP_GETATTR(vp, vap, cred);
vput(vp);
vp = NULL;
if (!error)
error = aftat_ret;
ereply:
nfsm_reply(NFSX_PREOPATTR(v3) + NFSX_POSTOPORFATTR(v3) +
2 * NFSX_UNSIGNED + NFSX_WRITEVERF(v3));
if (v3) {
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap);
if (error) {
error = 0;
goto nfsmout;
}
tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(retlen);
/*
* If nfs_async is set, then pretend the write was FILESYNC.
*/
if (stable == NFSV3WRITE_UNSTABLE && !nfs_async)
*tl++ = txdr_unsigned(stable);
else
*tl++ = txdr_unsigned(NFSV3WRITE_FILESYNC);
/*
* Actually, there is no need to txdr these fields,
* but it may make the values more human readable,
* for debugging purposes.
*/
if (nfsver.tv_sec == 0)
nfsver = boottime;
*tl++ = txdr_unsigned(nfsver.tv_sec);
*tl = txdr_unsigned(nfsver.tv_usec);
} else if (!error) {
/* v2 non-error case. */
fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(vap, fp);
}
error = 0;
nfsmout:
if (vp)
vput(vp);
vn_finished_write(mntp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
#ifdef NFS_LEGACYRPC
/*
* XXX dfr - write gathering isn't supported by the new RPC code since
* its really only useful for NFSv2. If there is a real need, we could
* attempt to fit it into the filehandle affinity system, e.g. by
* looking to see if there are queued write requests that overlap this
* one.
*/
/*
* For the purposes of write gathering, we must decide if the credential
* associated with two pending requests have equivilent privileges. Since
* NFS only uses a subset of the BSD ucred -- the effective uid and group
* IDs -- we have a compare routine that checks only the relevant fields.
*/
static int
nfsrv_samecred(struct ucred *cr1, struct ucred *cr2)
{
int i;
if (cr1->cr_uid != cr2->cr_uid)
return (0);
if (cr1->cr_ngroups != cr2->cr_ngroups)
return (0);
for (i = 0; i < cr1->cr_ngroups; i++) {
if (cr1->cr_groups[i] != cr2->cr_groups[i])
return (0);
}
return (1);
}
/*
* NFS write service with write gathering support. Called when
* nfsrvw_procrastinate > 0.
* See: Chet Juszczak, "Improving the Write Performance of an NFS Server",
* in Proc. of the Winter 1994 Usenix Conference, pg. 247-259, San Franscisco,
* Jan. 1994.
*/
int
nfsrv_writegather(struct nfsrv_descript **ndp, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct iovec *ivp;
struct mbuf *mp;
struct nfsrv_descript *wp, *nfsd, *owp, *swp;
struct nfs_fattr *fp;
int i;
struct iovec *iov;
struct nfsrvw_delayhash *wpp;
struct ucred *cred;
struct vattr va, forat;
u_int32_t *tl;
caddr_t bpos, dpos;
int error = 0, rdonly, len, forat_ret = 1;
int ioflags, aftat_ret = 1, s, adjust, v3, zeroing;
struct mbuf *mb, *mreq, *mrep, *md;
struct vnode *vp = NULL;
struct uio io, *uiop = &io;
u_quad_t cur_usec;
struct mount *mntp = NULL;
int mvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
#ifndef nolint
i = 0;
len = 0;
#endif
vfslocked = 0;
*mrq = NULL;
if (*ndp) {
nfsd = *ndp;
*ndp = NULL;
mrep = nfsd->nd_mrep;
md = nfsd->nd_md;
dpos = nfsd->nd_dpos;
cred = nfsd->nd_cr;
v3 = (nfsd->nd_flag & ND_NFSV3);
LIST_INIT(&nfsd->nd_coalesce);
nfsd->nd_mreq = NULL;
nfsd->nd_stable = NFSV3WRITE_FILESYNC;
cur_usec = nfs_curusec();
nfsd->nd_time = cur_usec +
(v3 ? nfsrvw_procrastinate_v3 : nfsrvw_procrastinate);
/*
* Now, get the write header..
*/
nfsm_srvmtofh(&nfsd->nd_fh);
if (v3) {
tl = nfsm_dissect_nonblock(u_int32_t *, 5 * NFSX_UNSIGNED);
nfsd->nd_off = fxdr_hyper(tl);
tl += 3;
nfsd->nd_stable = fxdr_unsigned(int, *tl++);
} else {
tl = nfsm_dissect_nonblock(u_int32_t *, 4 * NFSX_UNSIGNED);
nfsd->nd_off = (off_t)fxdr_unsigned(u_int32_t, *++tl);
tl += 2;
if (nfs_async)
nfsd->nd_stable = NFSV3WRITE_UNSTABLE;
}
len = fxdr_unsigned(int32_t, *tl);
nfsd->nd_len = len;
nfsd->nd_eoff = nfsd->nd_off + len;
/*
* Trim the header out of the mbuf list and trim off any trailing
* junk so that the mbuf list has only the write data.
*/
zeroing = 1;
i = 0;
mp = mrep;
while (mp) {
if (mp == md) {
zeroing = 0;
adjust = dpos - mtod(mp, caddr_t);
mp->m_len -= adjust;
if (mp->m_len > 0 && adjust > 0)
mp->m_data += adjust;
}
if (zeroing)
mp->m_len = 0;
else {
i += mp->m_len;
if (i > len) {
mp->m_len -= (i - len);
zeroing = 1;
}
}
mp = mp->m_next;
}
if (len > NFS_MAXDATA || len < 0 || i < len) {
nfsmout:
m_freem(mrep);
error = EIO;
nfsm_writereply(2 * NFSX_UNSIGNED);
if (v3)
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
nfsd->nd_mreq = mreq;
nfsd->nd_mrep = NULL;
nfsd->nd_time = 0;
}
/*
* Add this entry to the hash and time queues.
*/
s = splsoftclock();
owp = NULL;
wp = LIST_FIRST(&slp->ns_tq);
while (wp && wp->nd_time < nfsd->nd_time) {
owp = wp;
wp = LIST_NEXT(wp, nd_tq);
}
NFS_DPF(WG, ("Q%03x", nfsd->nd_retxid & 0xfff));
if (owp) {
LIST_INSERT_AFTER(owp, nfsd, nd_tq);
} else {
LIST_INSERT_HEAD(&slp->ns_tq, nfsd, nd_tq);
}
if (nfsd->nd_mrep) {
wpp = NWDELAYHASH(slp, nfsd->nd_fh.fh_fid.fid_data);
owp = NULL;
wp = LIST_FIRST(wpp);
while (wp &&
bcmp((caddr_t)&nfsd->nd_fh,(caddr_t)&wp->nd_fh, NFSX_V3FH)){
owp = wp;
wp = LIST_NEXT(wp, nd_hash);
}
while (wp && wp->nd_off < nfsd->nd_off &&
!bcmp((caddr_t)&nfsd->nd_fh,(caddr_t)&wp->nd_fh, NFSX_V3FH)) {
owp = wp;
wp = LIST_NEXT(wp, nd_hash);
}
if (owp) {
LIST_INSERT_AFTER(owp, nfsd, nd_hash);
/*
* Search the hash list for overlapping entries and
* coalesce.
*/
for(; nfsd && NFSW_CONTIG(owp, nfsd); nfsd = wp) {
wp = LIST_NEXT(nfsd, nd_hash);
if (nfsrv_samecred(owp->nd_cr, nfsd->nd_cr))
nfsrvw_coalesce(owp, nfsd);
}
} else {
LIST_INSERT_HEAD(wpp, nfsd, nd_hash);
}
}
splx(s);
}
/*
* Now, do VOP_WRITE()s for any one(s) that need to be done now
* and generate the associated reply mbuf list(s).
*/
loop1:
cur_usec = nfs_curusec();
s = splsoftclock();
for (nfsd = LIST_FIRST(&slp->ns_tq); nfsd; nfsd = owp) {
owp = LIST_NEXT(nfsd, nd_tq);
if (nfsd->nd_time > cur_usec)
break;
if (nfsd->nd_mreq)
continue;
NFS_DPF(WG, ("P%03x", nfsd->nd_retxid & 0xfff));
LIST_REMOVE(nfsd, nd_tq);
LIST_REMOVE(nfsd, nd_hash);
splx(s);
mrep = nfsd->nd_mrep;
nfsd->nd_mrep = NULL;
cred = nfsd->nd_cr;
v3 = (nfsd->nd_flag & ND_NFSV3);
forat_ret = aftat_ret = 1;
error = nfsrv_fhtovp(&nfsd->nd_fh, 1, &vp, &vfslocked, nfsd,
slp, nfsd->nd_nam, &rdonly, TRUE);
if (!error) {
if (v3)
forat_ret = VOP_GETATTR(vp, &forat, cred);
if (vp->v_type != VREG) {
if (v3)
error = EINVAL;
else
error = (vp->v_type == VDIR) ? EISDIR : EACCES;
}
} else {
vp = NULL;
}
if (!error)
error = nfsrv_access(vp, VWRITE, cred, rdonly, 1);
if (nfsd->nd_stable == NFSV3WRITE_UNSTABLE)
ioflags = IO_NODELOCKED;
else if (nfsd->nd_stable == NFSV3WRITE_DATASYNC)
ioflags = (IO_SYNC | IO_NODELOCKED);
else
ioflags = (IO_METASYNC | IO_SYNC | IO_NODELOCKED);
uiop->uio_rw = UIO_WRITE;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_td = NULL;
uiop->uio_offset = nfsd->nd_off;
uiop->uio_resid = nfsd->nd_eoff - nfsd->nd_off;
if (uiop->uio_resid > 0) {
mp = mrep;
i = 0;
while (mp) {
if (mp->m_len > 0)
i++;
mp = mp->m_next;
}
uiop->uio_iovcnt = i;
iov = malloc(i * sizeof (struct iovec),
M_TEMP, M_WAITOK);
uiop->uio_iov = ivp = iov;
mp = mrep;
while (mp) {
if (mp->m_len > 0) {
ivp->iov_base = mtod(mp, caddr_t);
ivp->iov_len = mp->m_len;
ivp++;
}
mp = mp->m_next;
}
mvfslocked = 0;
if (!error) {
if (vn_start_write(vp, &mntp, V_NOWAIT) != 0) {
VOP_UNLOCK(vp, 0);
error = vn_start_write(NULL, &mntp, V_WAIT);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
}
mvfslocked = VFS_LOCK_GIANT(mntp);
}
if (!error) {
error = VOP_WRITE(vp, uiop, ioflags, cred);
/* Unlocked write. */
nfsrvstats.srvvop_writes++;
vn_finished_write(mntp);
}
VFS_UNLOCK_GIANT(mvfslocked);
free((caddr_t)iov, M_TEMP);
}
m_freem(mrep);
if (vp) {
aftat_ret = VOP_GETATTR(vp, &va, cred);
vput(vp);
vp = NULL;
}
VFS_UNLOCK_GIANT(vfslocked);
/*
* Loop around generating replies for all write rpcs that have
* now been completed.
*/
swp = nfsd;
do {
NFS_DPF(WG, ("R%03x", nfsd->nd_retxid & 0xfff));
if (error) {
nfsm_writereply(NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
}
} else {
nfsm_writereply(NFSX_PREOPATTR(v3) +
NFSX_POSTOPORFATTR(v3) + 2 * NFSX_UNSIGNED +
NFSX_WRITEVERF(v3));
if (v3) {
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(nfsd->nd_len);
*tl++ = txdr_unsigned(swp->nd_stable);
/*
* Actually, there is no need to txdr these fields,
* but it may make the values more human readable,
* for debugging purposes.
*/
if (nfsver.tv_sec == 0)
nfsver = boottime;
*tl++ = txdr_unsigned(nfsver.tv_sec);
*tl = txdr_unsigned(nfsver.tv_usec);
} else {
fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(&va, fp);
}
}
nfsd->nd_mreq = mreq;
if (nfsd->nd_mrep)
panic("nfsrv_write: nd_mrep not free");
/*
* Done. Put it at the head of the timer queue so that
* the final phase can return the reply.
*/
s = splsoftclock();
if (nfsd != swp) {
nfsd->nd_time = 0;
LIST_INSERT_HEAD(&slp->ns_tq, nfsd, nd_tq);
}
nfsd = LIST_FIRST(&swp->nd_coalesce);
if (nfsd) {
LIST_REMOVE(nfsd, nd_tq);
}
splx(s);
} while (nfsd);
s = splsoftclock();
swp->nd_time = 0;
LIST_INSERT_HEAD(&slp->ns_tq, swp, nd_tq);
splx(s);
goto loop1;
}
splx(s);
/*
* Search for a reply to return.
*/
s = splsoftclock();
LIST_FOREACH(nfsd, &slp->ns_tq, nd_tq)
if (nfsd->nd_mreq) {
NFS_DPF(WG, ("X%03x", nfsd->nd_retxid & 0xfff));
LIST_REMOVE(nfsd, nd_tq);
*mrq = nfsd->nd_mreq;
*ndp = nfsd;
break;
}
splx(s);
return (0);
}
/*
* Coalesce the write request nfsd into owp. To do this we must:
* - remove nfsd from the queues
* - merge nfsd->nd_mrep into owp->nd_mrep
* - update the nd_eoff and nd_stable for owp
* - put nfsd on owp's nd_coalesce list
* NB: Must be called at splsoftclock().
*/
static void
nfsrvw_coalesce(struct nfsrv_descript *owp, struct nfsrv_descript *nfsd)
{
int overlap;
struct mbuf *mp;
struct nfsrv_descript *p;
NFS_DPF(WG, ("C%03x-%03x",
nfsd->nd_retxid & 0xfff, owp->nd_retxid & 0xfff));
LIST_REMOVE(nfsd, nd_hash);
LIST_REMOVE(nfsd, nd_tq);
if (owp->nd_eoff < nfsd->nd_eoff) {
overlap = owp->nd_eoff - nfsd->nd_off;
if (overlap < 0)
panic("nfsrv_coalesce: bad off");
if (overlap > 0)
m_adj(nfsd->nd_mrep, overlap);
mp = owp->nd_mrep;
while (mp->m_next)
mp = mp->m_next;
mp->m_next = nfsd->nd_mrep;
owp->nd_eoff = nfsd->nd_eoff;
} else
m_freem(nfsd->nd_mrep);
nfsd->nd_mrep = NULL;
if (nfsd->nd_stable == NFSV3WRITE_FILESYNC)
owp->nd_stable = NFSV3WRITE_FILESYNC;
else if (nfsd->nd_stable == NFSV3WRITE_DATASYNC &&
owp->nd_stable == NFSV3WRITE_UNSTABLE)
owp->nd_stable = NFSV3WRITE_DATASYNC;
LIST_INSERT_HEAD(&owp->nd_coalesce, nfsd, nd_tq);
/*
* If nfsd had anything else coalesced into it, transfer them
* to owp, otherwise their replies will never get sent.
*/
for (p = LIST_FIRST(&nfsd->nd_coalesce); p;
p = LIST_FIRST(&nfsd->nd_coalesce)) {
LIST_REMOVE(p, nd_tq);
LIST_INSERT_HEAD(&owp->nd_coalesce, p, nd_tq);
}
}
#endif
/*
* nfs create service
* now does a truncate to 0 length via. setattr if it already exists
*/
int
nfsrv_create(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct nfs_fattr *fp;
struct vattr va, dirfor, diraft;
struct vattr *vap = &va;
struct nfsv2_sattr *sp;
u_int32_t *tl;
struct nameidata nd;
caddr_t bpos;
int error = 0, rdev, len, tsize, dirfor_ret = 1, diraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3), how, exclusive_flag = 0;
caddr_t cp;
struct mbuf *mb, *mreq;
struct vnode *dirp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
u_quad_t tempsize;
u_char cverf[NFSX_V3CREATEVERF];
struct mount *mp = NULL;
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
#ifndef nolint
rdev = 0;
#endif
ndclear(&nd);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto ereply;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | SAVESTART | MPSAFE;
/*
* Call namei and do initial cleanup to get a few things
* out of the way. If we get an initial error we cleanup
* and return here to avoid special-casing the invalid nd
* structure through the rest of the case. dirp may be
* set even if an error occurs, but the nd structure will not
* be valid at all if an error occurs so we have to invalidate it
* prior to calling nfsm_reply ( which might goto nfsmout ).
*/
error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
if (dirp && !v3) {
vrele(dirp);
dirp = NULL;
}
if (error) {
nfsm_reply(NFSX_WCCDATA(v3));
if (v3)
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
error = 0;
goto nfsmout;
}
/*
* No error. Continue. State:
*
* startdir is valid ( we release this immediately )
* dirp may be valid
* nd.ni_vp may be valid
* nd.ni_dvp is valid
*
* The error state is set through the code and we may also do some
* opportunistic releasing of vnodes to avoid holding locks through
* NFS I/O. The cleanup at the end is a catch-all
*/
VATTR_NULL(vap);
if (v3) {
tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED);
how = fxdr_unsigned(int, *tl);
switch (how) {
case NFSV3CREATE_GUARDED:
if (nd.ni_vp) {
error = EEXIST;
break;
}
/* fall through */
case NFSV3CREATE_UNCHECKED:
nfsm_srvsattr(vap);
break;
case NFSV3CREATE_EXCLUSIVE:
cp = nfsm_dissect_nonblock(caddr_t, NFSX_V3CREATEVERF);
bcopy(cp, cverf, NFSX_V3CREATEVERF);
exclusive_flag = 1;
break;
};
vap->va_type = VREG;
} else {
sp = nfsm_dissect_nonblock(struct nfsv2_sattr *, NFSX_V2SATTR);
vap->va_type = IFTOVT(fxdr_unsigned(u_int32_t, sp->sa_mode));
if (vap->va_type == VNON)
vap->va_type = VREG;
vap->va_mode = nfstov_mode(sp->sa_mode);
switch (vap->va_type) {
case VREG:
tsize = fxdr_unsigned(int32_t, sp->sa_size);
if (tsize != -1)
vap->va_size = (u_quad_t)tsize;
break;
case VCHR:
case VBLK:
case VFIFO:
rdev = fxdr_unsigned(long, sp->sa_size);
break;
default:
break;
};
}
/*
* Iff doesn't exist, create it
* otherwise just truncate to 0 length
* should I set the mode too ?
*
* The only possible error we can have at this point is EEXIST.
* nd.ni_vp will also be non-NULL in that case.
*/
if (nd.ni_vp == NULL) {
if (vap->va_mode == (mode_t)VNOVAL)
vap->va_mode = 0;
if (vap->va_type == VREG || vap->va_type == VSOCK) {
error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
if (error)
NDFREE(&nd, NDF_ONLY_PNBUF);
else {
if (exclusive_flag) {
exclusive_flag = 0;
VATTR_NULL(vap);
bcopy(cverf, (caddr_t)&vap->va_atime,
NFSX_V3CREATEVERF);
error = VOP_SETATTR(nd.ni_vp, vap,
cred);
}
}
} else if (vap->va_type == VCHR || vap->va_type == VBLK ||
vap->va_type == VFIFO) {
/*
* NFSv2-specific code for creating device nodes
* and fifos.
*
* Handle SysV FIFO node special cases. All other
* devices require super user to access.
*/
if (vap->va_type == VCHR && rdev == 0xffffffff)
vap->va_type = VFIFO;
if (vap->va_type != VFIFO &&
(error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV,
0))) {
goto ereply;
}
vap->va_rdev = rdev;
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
if (error) {
NDFREE(&nd, NDF_ONLY_PNBUF);
goto ereply;
}
vput(nd.ni_vp);
nd.ni_vp = NULL;
/*
* release dvp prior to lookup
*/
vput(nd.ni_dvp);
nd.ni_dvp = NULL;
/*
* Setup for lookup.
*
* Even though LOCKPARENT was cleared, ni_dvp may
* be garbage.
*/
nd.ni_cnd.cn_nameiop = LOOKUP;
nd.ni_cnd.cn_flags &= ~(LOCKPARENT);
nd.ni_cnd.cn_thread = curthread;
nd.ni_cnd.cn_cred = cred;
tvfslocked = VFS_LOCK_GIANT(nd.ni_startdir->v_mount);
if (tvfslocked)
nd.ni_cnd.cn_flags |= GIANTHELD;
error = lookup(&nd);
nd.ni_dvp = NULL;
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
nd.ni_cnd.cn_flags &= ~GIANTHELD;
if (error)
goto ereply;
if (nd.ni_cnd.cn_flags & ISSYMLINK) {
error = EINVAL;
goto ereply;
}
} else {
error = ENXIO;
}
} else {
if (vap->va_size != -1) {
error = nfsrv_access(nd.ni_vp, VWRITE,
cred, (nd.ni_cnd.cn_flags & RDONLY), 0);
if (!error) {
tempsize = vap->va_size;
VATTR_NULL(vap);
vap->va_size = tempsize;
error = VOP_SETATTR(nd.ni_vp, vap, cred);
}
}
}
if (!error) {
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid;
error = VOP_VPTOFH(nd.ni_vp, &fhp->fh_fid);
if (!error)
error = VOP_GETATTR(nd.ni_vp, vap, cred);
}
if (v3) {
if (exclusive_flag && !error &&
bcmp(cverf, (caddr_t)&vap->va_atime, NFSX_V3CREATEVERF))
error = EEXIST;
if (dirp == nd.ni_dvp)
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
else {
/* Drop the other locks to avoid deadlock. */
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vput(nd.ni_vp);
nd.ni_dvp = NULL;
nd.ni_vp = NULL;
vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp, 0);
}
}
ereply:
nfsm_reply(NFSX_SRVFH(v3) + NFSX_FATTR(v3) + NFSX_WCCDATA(v3));
if (v3) {
if (!error) {
nfsm_srvpostop_fh(fhp);
nfsm_srvpostop_attr(0, vap);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
} else if (!error) {
/* v2 non-error case. */
nfsm_srvfhtom(fhp, v3);
fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(vap, fp);
}
error = 0;
nfsmout:
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vput(nd.ni_vp);
if (nd.ni_startdir) {
vrele(nd.ni_startdir);
nd.ni_startdir = NULL;
}
if (dirp)
vrele(dirp);
NDFREE(&nd, NDF_ONLY_PNBUF);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* nfs v3 mknod service
*/
int
nfsrv_mknod(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct vattr va, dirfor, diraft;
struct vattr *vap = &va;
struct thread *td = curthread;
u_int32_t *tl;
struct nameidata nd;
caddr_t bpos;
int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
u_int32_t major, minor;
enum vtype vtyp;
struct mbuf *mb, *mreq;
struct vnode *vp, *dirp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
struct mount *mp = NULL;
int v3 = (nfsd->nd_flag & ND_NFSV3);
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
if (!v3)
panic("nfsrv_mknod: v3 proc called on a v2 connection");
ndclear(&nd);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto ereply;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | SAVESTART | MPSAFE;
/*
* Handle nfs_namei() call. If an error occurs, the nd structure
* is not valid. However, nfsm_*() routines may still jump to
* nfsmout.
*/
error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
if (error) {
nfsm_reply(NFSX_WCCDATA(1));
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
error = 0;
goto nfsmout;
}
tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED);
vtyp = nfsv3tov_type(*tl);
if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
error = NFSERR_BADTYPE;
goto out;
}
VATTR_NULL(vap);
nfsm_srvsattr(vap);
if (vtyp == VCHR || vtyp == VBLK) {
tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED);
major = fxdr_unsigned(u_int32_t, *tl++);
minor = fxdr_unsigned(u_int32_t, *tl);
vap->va_rdev = makedev(major, minor);
}
/*
* Iff doesn't exist, create it.
*/
if (nd.ni_vp) {
error = EEXIST;
goto out;
}
vap->va_type = vtyp;
if (vap->va_mode == (mode_t)VNOVAL)
vap->va_mode = 0;
if (vtyp == VSOCK) {
vrele(nd.ni_startdir);
nd.ni_startdir = NULL;
error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
if (error)
NDFREE(&nd, NDF_ONLY_PNBUF);
} else {
if (vtyp != VFIFO && (error = priv_check_cred(cred,
PRIV_VFS_MKNOD_DEV, 0)))
goto out;
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
if (error) {
NDFREE(&nd, NDF_ONLY_PNBUF);
goto out;
}
vput(nd.ni_vp);
nd.ni_vp = NULL;
/*
* Release dvp prior to lookup
*/
vput(nd.ni_dvp);
nd.ni_dvp = NULL;
nd.ni_cnd.cn_nameiop = LOOKUP;
nd.ni_cnd.cn_flags &= ~(LOCKPARENT);
nd.ni_cnd.cn_thread = td;
nd.ni_cnd.cn_cred = td->td_ucred;
tvfslocked = VFS_LOCK_GIANT(nd.ni_startdir->v_mount);
if (tvfslocked)
nd.ni_cnd.cn_flags |= GIANTHELD;
error = lookup(&nd);
nd.ni_dvp = NULL;
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
nd.ni_cnd.cn_flags &= ~GIANTHELD;
if (error)
goto out;
if (nd.ni_cnd.cn_flags & ISSYMLINK)
error = EINVAL;
}
/*
* send response, cleanup, return.
*/
out:
vp = nd.ni_vp;
if (!error) {
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VOP_VPTOFH(vp, &fhp->fh_fid);
if (!error)
error = VOP_GETATTR(vp, vap, cred);
}
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
nd.ni_dvp = NULL;
}
if (vp) {
vput(vp);
vp = NULL;
nd.ni_vp = NULL;
}
if (nd.ni_startdir) {
vrele(nd.ni_startdir);
nd.ni_startdir = NULL;
}
NDFREE(&nd, NDF_ONLY_PNBUF);
if (dirp) {
vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp, 0);
}
ereply:
nfsm_reply(NFSX_SRVFH(1) + NFSX_POSTOPATTR(1) + NFSX_WCCDATA(1));
if (v3) {
if (!error) {
nfsm_srvpostop_fh(fhp);
nfsm_srvpostop_attr(0, vap);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
}
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (0);
nfsmout:
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vput(nd.ni_vp);
if (dirp)
vrele(dirp);
if (nd.ni_startdir)
vrele(nd.ni_startdir);
NDFREE(&nd, NDF_ONLY_PNBUF);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* nfs remove service
*/
int
nfsrv_remove(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct nameidata nd;
caddr_t bpos;
int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct vnode *dirp;
struct vattr dirfor, diraft;
nfsfh_t nfh;
fhandle_t *fhp;
struct mount *mp = NULL;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
ndclear(&nd);
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto ereply;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = DELETE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | MPSAFE;
error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
if (dirp && !v3) {
vrele(dirp);
dirp = NULL;
}
if (error == 0) {
if (nd.ni_vp->v_type == VDIR) {
error = EPERM; /* POSIX */
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (nd.ni_vp->v_vflag & VV_ROOT) {
error = EBUSY;
goto out;
}
out:
if (!error) {
error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
NDFREE(&nd, NDF_ONLY_PNBUF);
}
}
if (dirp && v3) {
if (dirp == nd.ni_dvp)
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
else {
/* Drop the other locks to avoid deadlock. */
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vput(nd.ni_vp);
nd.ni_dvp = NULL;
nd.ni_vp = NULL;
vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp, 0);
}
vrele(dirp);
dirp = NULL;
}
ereply:
nfsm_reply(NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
error = 0;
}
nfsmout:
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vput(nd.ni_vp);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs rename service
*/
int
nfsrv_rename(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
caddr_t bpos;
int error = 0, len, len2, fdirfor_ret = 1, fdiraft_ret = 1;
int tdirfor_ret = 1, tdiraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct nameidata fromnd, tond;
struct vnode *fvp, *tvp, *tdvp, *fdirp = NULL;
struct vnode *tdirp = NULL;
struct vattr fdirfor, fdiraft, tdirfor, tdiraft;
nfsfh_t fnfh, tnfh;
fhandle_t *ffhp, *tfhp;
uid_t saved_uid;
struct mount *mp = NULL;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
#ifndef nolint
fvp = NULL;
#endif
ffhp = &fnfh.fh_generic;
tfhp = &tnfh.fh_generic;
/*
* Clear fields incase goto nfsmout occurs from macro.
*/
ndclear(&fromnd);
ndclear(&tond);
nfsm_srvmtofh(ffhp);
if ((mp = vfs_getvfs(&ffhp->fh_fsid)) == NULL) {
error = ESTALE;
goto out1;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvnamesiz(len);
/*
* Remember our original uid so that we can reset cr_uid before
* the second nfs_namei() call, in case it is remapped.
*/
saved_uid = cred->cr_uid;
fromnd.ni_cnd.cn_cred = cred;
fromnd.ni_cnd.cn_nameiop = DELETE;
fromnd.ni_cnd.cn_flags = WANTPARENT | SAVESTART | MPSAFE;
error = nfs_namei(&fromnd, nfsd, ffhp, len, slp, nam, &md,
&dpos, &fdirp, v3, &fdirfor, &fdirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &fromnd);
if (fdirp && !v3) {
vrele(fdirp);
fdirp = NULL;
}
if (error) {
nfsm_reply(2 * NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft);
nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft);
}
error = 0;
goto nfsmout;
}
fvp = fromnd.ni_vp;
nfsm_srvmtofh(tfhp);
nfsm_srvnamesiz(len2);
cred->cr_uid = saved_uid;
tond.ni_cnd.cn_cred = cred;
tond.ni_cnd.cn_nameiop = RENAME;
tond.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | MPSAFE;
error = nfs_namei(&tond, nfsd, tfhp, len2, slp, nam, &md,
&dpos, &tdirp, v3, &tdirfor, &tdirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &tond);
if (tdirp && !v3) {
vrele(tdirp);
tdirp = NULL;
}
if (error)
goto out1;
tdvp = tond.ni_dvp;
tvp = tond.ni_vp;
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
if (v3)
error = EEXIST;
else
error = EISDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
if (v3)
error = EEXIST;
else
error = ENOTDIR;
goto out;
}
if (tvp->v_type == VDIR && tvp->v_mountedhere) {
if (v3)
error = EXDEV;
else
error = ENOTEMPTY;
goto out;
}
}
if (fvp->v_type == VDIR && fvp->v_mountedhere) {
if (v3)
error = EXDEV;
else
error = ENOTEMPTY;
goto out;
}
if (fvp->v_mount != tdvp->v_mount) {
if (v3)
error = EXDEV;
else
error = ENOTEMPTY;
goto out;
}
if (fvp == tdvp) {
if (v3)
error = EINVAL;
else
error = ENOTEMPTY;
}
/*
* If source is the same as the destination (that is the
* same vnode with the same name in the same directory),
* then there is nothing to do.
*/
if (fvp == tvp && fromnd.ni_dvp == tdvp &&
fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen &&
!bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr,
fromnd.ni_cnd.cn_namelen))
error = -1;
out:
if (!error) {
/*
* The VOP_RENAME function releases all vnode references &
* locks prior to returning so we need to clear the pointers
* to bypass cleanup code later on.
*/
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
fromnd.ni_dvp = NULL;
fromnd.ni_vp = NULL;
tond.ni_dvp = NULL;
tond.ni_vp = NULL;
if (error) {
NDFREE(&fromnd, NDF_ONLY_PNBUF);
NDFREE(&tond, NDF_ONLY_PNBUF);
}
} else {
if (error == -1)
error = 0;
}
/* fall through */
out1:
nfsm_reply(2 * NFSX_WCCDATA(v3));
if (v3) {
/* Release existing locks to prevent deadlock. */
if (tond.ni_dvp) {
if (tond.ni_dvp == tond.ni_vp)
vrele(tond.ni_dvp);
else
vput(tond.ni_dvp);
}
if (tond.ni_vp)
vput(tond.ni_vp);
tond.ni_dvp = NULL;
tond.ni_vp = NULL;
if (fdirp) {
vn_lock(fdirp, LK_EXCLUSIVE | LK_RETRY);
fdiraft_ret = VOP_GETATTR(fdirp, &fdiraft, cred);
VOP_UNLOCK(fdirp, 0);
}
if (tdirp) {
vn_lock(tdirp, LK_EXCLUSIVE | LK_RETRY);
tdiraft_ret = VOP_GETATTR(tdirp, &tdiraft, cred);
VOP_UNLOCK(tdirp, 0);
}
nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft);
nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft);
}
error = 0;
/* fall through */
nfsmout:
/*
* Clear out tond related fields
*/
if (tond.ni_dvp) {
if (tond.ni_dvp == tond.ni_vp)
vrele(tond.ni_dvp);
else
vput(tond.ni_dvp);
}
if (tond.ni_vp)
vput(tond.ni_vp);
if (tdirp)
vrele(tdirp);
if (tond.ni_startdir)
vrele(tond.ni_startdir);
NDFREE(&tond, NDF_ONLY_PNBUF);
/*
* Clear out fromnd related fields
*/
if (fdirp)
vrele(fdirp);
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
NDFREE(&fromnd, NDF_ONLY_PNBUF);
if (fromnd.ni_dvp)
vrele(fromnd.ni_dvp);
if (fromnd.ni_vp)
vrele(fromnd.ni_vp);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* nfs link service
*/
int
nfsrv_link(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct nameidata nd;
caddr_t bpos;
int error = 0, rdonly, len, dirfor_ret = 1, diraft_ret = 1;
int getret = 1, v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct vnode *vp = NULL, *xp, *dirp = NULL;
struct vattr dirfor, diraft, at;
nfsfh_t nfh, dnfh;
fhandle_t *fhp, *dfhp;
struct mount *mp = NULL;
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
ndclear(&nd);
vfslocked = 0;
fhp = &nfh.fh_generic;
dfhp = &dnfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto ereply;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvmtofh(dfhp);
nfsm_srvnamesiz(len);
error = nfsrv_fhtovp(fhp, TRUE, &vp, &tvfslocked, nfsd, slp,
nam, &rdonly, TRUE);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvpostop_attr(getret, &at);
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
}
vp = NULL;
error = 0;
goto nfsmout;
}
if (v3)
getret = VOP_GETATTR(vp, &at, cred);
if (vp->v_type == VDIR) {
error = EPERM; /* POSIX */
goto out1;
}
VOP_UNLOCK(vp, 0);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | MPSAFE | MPSAFE;
error = nfs_namei(&nd, nfsd, dfhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
if (dirp && !v3) {
vrele(dirp);
dirp = NULL;
}
if (error) {
vrele(vp);
vp = NULL;
goto out2;
}
xp = nd.ni_vp;
if (xp != NULL) {
error = EEXIST;
vrele(vp);
vp = NULL;
goto out2;
}
xp = nd.ni_dvp;
if (vp->v_mount != xp->v_mount) {
error = EXDEV;
vrele(vp);
vp = NULL;
goto out2;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* fall through */
out1:
if (v3)
getret = VOP_GETATTR(vp, &at, cred);
out2:
if (dirp) {
if (dirp == nd.ni_dvp)
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
else {
/* Release existing locks to prevent deadlock. */
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vrele(nd.ni_vp);
nd.ni_dvp = NULL;
nd.ni_vp = NULL;
vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp, 0);
}
}
ereply:
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvpostop_attr(getret, &at);
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
error = 0;
}
/* fall through */
nfsmout:
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp)
vput(vp);
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (dirp)
vrele(dirp);
if (nd.ni_vp)
vrele(nd.ni_vp);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs symbolic link service
*/
int
nfsrv_symlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct vattr va, dirfor, diraft;
struct nameidata nd;
struct vattr *vap = &va;
struct nfsv2_sattr *sp;
char *bpos, *pathcp = NULL;
struct uio io;
struct iovec iv;
int error = 0, len, len2, dirfor_ret = 1, diraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct vnode *dirp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
struct mount *mp = NULL;
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
ndclear(&nd);
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto out;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | SAVESTART | MPSAFE;
error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
if (error == 0) {
VATTR_NULL(vap);
if (v3)
nfsm_srvsattr(vap);
nfsm_srvpathsiz(len2);
}
if (dirp && !v3) {
vrele(dirp);
dirp = NULL;
}
if (error)
goto out;
pathcp = malloc(len2 + 1, M_TEMP, M_WAITOK);
iv.iov_base = pathcp;
iv.iov_len = len2;
io.uio_resid = len2;
io.uio_offset = 0;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
io.uio_td = NULL;
nfsm_mtouio(&io, len2);
if (!v3) {
sp = nfsm_dissect_nonblock(struct nfsv2_sattr *, NFSX_V2SATTR);
vap->va_mode = nfstov_mode(sp->sa_mode);
}
*(pathcp + len2) = '\0';
if (nd.ni_vp) {
error = EEXIST;
goto out;
}
/*
* issue symlink op. SAVESTART is set so the underlying path component
* is only freed by the VOP if an error occurs.
*/
if (vap->va_mode == (mode_t)VNOVAL)
vap->va_mode = 0;
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap, pathcp);
if (error)
NDFREE(&nd, NDF_ONLY_PNBUF);
else
vput(nd.ni_vp);
nd.ni_vp = NULL;
/*
* releases directory prior to potential lookup op.
*/
vput(nd.ni_dvp);
nd.ni_dvp = NULL;
if (error == 0) {
if (v3) {
/*
* Issue lookup. Leave SAVESTART set so we can easily free
* the name buffer later on.
*
* since LOCKPARENT is not set, ni_dvp will be garbage on
* return whether an error occurs or not.
*/
nd.ni_cnd.cn_nameiop = LOOKUP;
nd.ni_cnd.cn_flags &= ~(LOCKPARENT | FOLLOW);
nd.ni_cnd.cn_flags |= (NOFOLLOW | LOCKLEAF);
nd.ni_cnd.cn_thread = curthread;
nd.ni_cnd.cn_cred = cred;
tvfslocked = VFS_LOCK_GIANT(nd.ni_startdir->v_mount);
if (tvfslocked)
nd.ni_cnd.cn_flags |= GIANTHELD;
error = lookup(&nd);
nd.ni_dvp = NULL;
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
nd.ni_cnd.cn_flags &= ~GIANTHELD;
if (error == 0) {
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid;
error = VOP_VPTOFH(nd.ni_vp, &fhp->fh_fid);
if (!error)
error = VOP_GETATTR(nd.ni_vp, vap, cred);
vput(nd.ni_vp);
nd.ni_vp = NULL;
}
}
}
out:
/*
* These releases aren't strictly required, does even doing them
* make any sense? XXX can nfsm_reply() block?
*/
if (pathcp) {
free(pathcp, M_TEMP);
pathcp = NULL;
}
if (dirp) {
vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp, 0);
}
if (nd.ni_startdir) {
vrele(nd.ni_startdir);
nd.ni_startdir = NULL;
}
nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
if (v3) {
if (!error) {
nfsm_srvpostop_fh(fhp);
nfsm_srvpostop_attr(0, vap);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
}
error = 0;
/* fall through */
nfsmout:
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vrele(nd.ni_vp);
if (nd.ni_startdir)
vrele(nd.ni_startdir);
if (dirp)
vrele(dirp);
if (pathcp)
free(pathcp, M_TEMP);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* nfs mkdir service
*/
int
nfsrv_mkdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct vattr va, dirfor, diraft;
struct vattr *vap = &va;
struct nfs_fattr *fp;
struct nameidata nd;
u_int32_t *tl;
caddr_t bpos;
int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct vnode *dirp = NULL;
int vpexcl = 0;
nfsfh_t nfh;
fhandle_t *fhp;
struct mount *mp = NULL;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
ndclear(&nd);
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto out;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | MPSAFE;
error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
if (dirp && !v3) {
vrele(dirp);
dirp = NULL;
}
if (error) {
nfsm_reply(NFSX_WCCDATA(v3));
if (v3)
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
error = 0;
goto nfsmout;
}
VATTR_NULL(vap);
if (v3) {
nfsm_srvsattr(vap);
} else {
tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED);
vap->va_mode = nfstov_mode(*tl++);
}
/*
* At this point nd.ni_dvp is referenced and exclusively locked and
* nd.ni_vp, if it exists, is referenced but not locked.
*/
vap->va_type = VDIR;
if (nd.ni_vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
error = EEXIST;
goto out;
}
/*
* Issue mkdir op. Since SAVESTART is not set, the pathname
* component is freed by the VOP call. This will fill-in
* nd.ni_vp, reference, and exclusively lock it.
*/
if (vap->va_mode == (mode_t)VNOVAL)
vap->va_mode = 0;
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
NDFREE(&nd, NDF_ONLY_PNBUF);
vpexcl = 1;
vput(nd.ni_dvp);
nd.ni_dvp = NULL;
if (!error) {
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid;
error = VOP_VPTOFH(nd.ni_vp, &fhp->fh_fid);
if (!error)
error = VOP_GETATTR(nd.ni_vp, vap, cred);
}
out:
if (dirp) {
if (dirp == nd.ni_dvp) {
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
} else {
/* Release existing locks to prevent deadlock. */
if (nd.ni_dvp) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == nd.ni_vp && vpexcl)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp) {
if (vpexcl)
vput(nd.ni_vp);
else
vrele(nd.ni_vp);
}
nd.ni_dvp = NULL;
nd.ni_vp = NULL;
vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp, 0);
}
}
nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
if (v3) {
if (!error) {
nfsm_srvpostop_fh(fhp);
nfsm_srvpostop_attr(0, vap);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
} else if (!error) {
/* v2 non-error case. */
nfsm_srvfhtom(fhp, v3);
fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(vap, fp);
}
error = 0;
/* fall through */
nfsmout:
if (nd.ni_dvp) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == nd.ni_vp && vpexcl)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp) {
if (vpexcl)
vput(nd.ni_vp);
else
vrele(nd.ni_vp);
}
if (dirp)
vrele(dirp);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* nfs rmdir service
*/
int
nfsrv_rmdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
caddr_t bpos;
int error = 0, len, dirfor_ret = 1, diraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct vnode *vp, *dirp = NULL;
struct vattr dirfor, diraft;
nfsfh_t nfh;
fhandle_t *fhp;
struct nameidata nd;
struct mount *mp = NULL;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
ndclear(&nd);
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto out;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = DELETE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | MPSAFE;
error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, FALSE);
vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd);
if (dirp && !v3) {
vrele(dirp);
dirp = NULL;
}
if (error) {
nfsm_reply(NFSX_WCCDATA(v3));
if (v3)
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
error = 0;
goto nfsmout;
}
vp = nd.ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (nd.ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_vflag & VV_ROOT)
error = EBUSY;
out:
/*
* Issue or abort op. Since SAVESTART is not set, path name
* component is freed by the VOP after either.
*/
if (!error)
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
NDFREE(&nd, NDF_ONLY_PNBUF);
if (dirp) {
if (dirp == nd.ni_dvp)
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
else {
/* Release existing locks to prevent deadlock. */
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vput(nd.ni_vp);
nd.ni_dvp = NULL;
nd.ni_vp = NULL;
vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp, 0);
}
}
nfsm_reply(NFSX_WCCDATA(v3));
error = 0;
if (v3)
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
/* fall through */
nfsmout:
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp) {
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
}
if (nd.ni_vp)
vput(nd.ni_vp);
if (dirp)
vrele(dirp);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs readdir service
* - mallocs what it thinks is enough to read
* count rounded up to a multiple of NFS_DIRBLKSIZ <= NFS_MAXREADDIR
* - calls VOP_READDIR()
* - loops around building the reply
* if the output generated exceeds count break out of loop
* The nfsm_clget macro is used here so that the reply will be packed
* tightly in mbuf clusters.
* - it only knows that it has encountered eof when the VOP_READDIR()
* reads nothing
* - as such one readdir rpc will return eof false although you are there
* and then the next will return eof
* - it trims out records with d_fileno == 0
* this doesn't matter for Unix clients, but they might confuse clients
* for other os'.
* NB: It is tempting to set eof to true if the VOP_READDIR() reads less
* than requested, but this may not apply to all filesystems. For
* example, client NFS does not { although it is never remote mounted
* anyhow }
* The alternate call nfsrv_readdirplus() does lookups as well.
* PS: The NFS protocol spec. does not clarify what the "count" byte
* argument is a count of.. just name strings and file id's or the
* entire reply rpc or ...
* I tried just file name and id sizes and it confused the Sun client,
* so I am using the full rpc size now. The "paranoia.." comment refers
* to including the status longwords that are not a part of the dir.
* "entry" structures, but are in the rpc.
*/
struct flrep {
nfsuint64 fl_off;
u_int32_t fl_postopok;
u_int32_t fl_fattr[NFSX_V3FATTR / sizeof (u_int32_t)];
u_int32_t fl_fhok;
u_int32_t fl_fhsize;
u_int32_t fl_nfh[NFSX_V3FH / sizeof (u_int32_t)];
};
int
nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
char *bp, *be;
struct mbuf *mp;
struct dirent *dp;
caddr_t cp;
u_int32_t *tl;
caddr_t bpos;
struct mbuf *mb, *mreq;
char *cpos, *cend, *rbuf;
struct vnode *vp = NULL;
struct vattr at;
nfsfh_t nfh;
fhandle_t *fhp;
struct uio io;
struct iovec iv;
int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1;
int siz, cnt, fullsiz, eofflag, rdonly, ncookies;
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;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if (v3) {
tl = nfsm_dissect_nonblock(u_int32_t *, 5 * NFSX_UNSIGNED);
toff = fxdr_hyper(tl);
tl += 2;
verf = fxdr_hyper(tl);
tl += 2;
} else {
tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED);
toff = fxdr_unsigned(u_quad_t, *tl++);
verf = 0; /* shut up gcc */
}
off = toff;
cnt = fxdr_unsigned(int, *tl);
siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
xfer = NFS_SRVMAXDATA(nfsd);
if (cnt > xfer)
cnt = xfer;
if (siz > xfer)
siz = xfer;
fullsiz = siz;
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
if (!error && vp->v_type != VDIR) {
error = ENOTDIR;
vput(vp);
vp = NULL;
}
if (error) {
nfsm_reply(NFSX_UNSIGNED);
if (v3)
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
/*
* Obtain lock on vnode for this section of the code
*/
if (v3) {
error = getret = VOP_GETATTR(vp, &at, cred);
#if 0
/*
* XXX This check may be too strict for Solaris 2.5 clients.
*/
if (!error && toff && verf && verf != at.va_filerev)
error = NFSERR_BAD_COOKIE;
#endif
}
if (!error)
error = nfsrv_access(vp, VEXEC, cred, rdonly, 0);
if (error) {
vput(vp);
vp = NULL;
nfsm_reply(NFSX_POSTOPATTR(v3));
if (v3)
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
VOP_UNLOCK(vp, 0);
/*
* end section. Allocate rbuf and continue
*/
rbuf = malloc(siz, M_TEMP, M_WAITOK);
again:
iv.iov_base = rbuf;
iv.iov_len = fullsiz;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_offset = (off_t)off;
io.uio_resid = fullsiz;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
io.uio_td = NULL;
eofflag = 0;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (cookies) {
free((caddr_t)cookies, M_TEMP);
cookies = NULL;
}
error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies);
off = (off_t)io.uio_offset;
if (!cookies && !error)
error = NFSERR_PERM;
if (v3) {
getret = VOP_GETATTR(vp, &at, cred);
if (!error)
error = getret;
}
VOP_UNLOCK(vp, 0);
if (error) {
vrele(vp);
vp = NULL;
free((caddr_t)rbuf, M_TEMP);
if (cookies)
free((caddr_t)cookies, M_TEMP);
nfsm_reply(NFSX_POSTOPATTR(v3));
if (v3)
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
if (io.uio_resid) {
siz -= io.uio_resid;
/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vrele(vp);
vp = NULL;
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) +
2 * NFSX_UNSIGNED);
if (v3) {
nfsm_srvpostop_attr(getret, &at);
tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
tl += 2;
} else
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = nfsrv_nfs_false;
*tl = nfsrv_nfs_true;
free((caddr_t)rbuf, M_TEMP);
free((caddr_t)cookies, M_TEMP);
error = 0;
goto nfsmout;
}
}
/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
cpos = rbuf;
cend = rbuf + siz;
dp = (struct dirent *)cpos;
cookiep = cookies;
/*
* For some reason FreeBSD's ufs_readdir() chooses to back the
* directory offset up to a block boundary, so it is necessary to
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
((u_quad_t)(*cookiep)) <= toff)) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
if (cpos >= cend || ncookies == 0) {
toff = off;
siz = fullsiz;
goto again;
}
len = 3 * NFSX_UNSIGNED; /* paranoia, probably can be 0 */
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) + siz);
if (v3) {
nfsm_srvpostop_attr(getret, &at);
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
}
mp = mb;
bp = bpos;
be = bp + M_TRAILINGSPACE(mp);
/* Loop through the records and build reply */
while (cpos < cend && ncookies > 0) {
if (dp->d_fileno != 0 && dp->d_type != DT_WHT) {
nlen = dp->d_namlen;
rem = nfsm_rndup(nlen) - nlen;
len += (4 * NFSX_UNSIGNED + nlen + rem);
if (v3)
len += 2 * NFSX_UNSIGNED;
if (len > cnt) {
eofflag = 0;
break;
}
/*
* Build the directory record xdr from
* the dirent entry.
*/
nfsm_clget;
*tl = nfsrv_nfs_true;
bp += NFSX_UNSIGNED;
if (v3) {
nfsm_clget;
*tl = 0;
bp += NFSX_UNSIGNED;
}
nfsm_clget;
*tl = txdr_unsigned(dp->d_fileno);
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(nlen);
bp += NFSX_UNSIGNED;
/* And loop around copying the name */
xfer = nlen;
cp = dp->d_name;
while (xfer > 0) {
nfsm_clget;
if ((bp+xfer) > be)
tsiz = be-bp;
else
tsiz = xfer;
bcopy(cp, bp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
/* And null pad to an int32_t boundary. */
for (i = 0; i < rem; i++)
*bp++ = '\0';
nfsm_clget;
/* Finish off the record */
if (v3) {
*tl = 0;
bp += NFSX_UNSIGNED;
nfsm_clget;
}
*tl = txdr_unsigned(*cookiep);
bp += NFSX_UNSIGNED;
}
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
vrele(vp);
vp = NULL;
nfsm_clget;
*tl = nfsrv_nfs_false;
bp += NFSX_UNSIGNED;
nfsm_clget;
if (eofflag)
*tl = nfsrv_nfs_true;
else
*tl = nfsrv_nfs_false;
bp += NFSX_UNSIGNED;
if (mp != mb) {
if (bp < be)
mp->m_len = bp - mtod(mp, caddr_t);
} else
mp->m_len += bp - bpos;
free((caddr_t)rbuf, M_TEMP);
free((caddr_t)cookies, M_TEMP);
nfsmout:
if (vp)
vrele(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
int
nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
char *bp, *be;
struct mbuf *mp;
struct dirent *dp;
caddr_t cp;
u_int32_t *tl;
caddr_t bpos;
struct mbuf *mb, *mreq;
char *cpos, *cend, *rbuf;
struct vnode *vp = NULL, *nvp;
struct flrep fl;
nfsfh_t nfh;
fhandle_t *fhp, *nfhp = (fhandle_t *)fl.fl_nfh;
struct uio io;
struct iovec iv;
struct vattr va, at, *vap = &va;
struct nfs_fattr *fp;
int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1;
int siz, cnt, fullsiz, eofflag, rdonly, dirlen, ncookies;
u_quad_t off, toff, verf;
u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */
int v3 = (nfsd->nd_flag & ND_NFSV3);
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
if (!v3)
panic("nfsrv_readdirplus: v3 proc called on a v2 connection");
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
tl = nfsm_dissect_nonblock(u_int32_t *, 6 * NFSX_UNSIGNED);
toff = fxdr_hyper(tl);
tl += 2;
verf = fxdr_hyper(tl);
tl += 2;
siz = fxdr_unsigned(int, *tl++);
cnt = fxdr_unsigned(int, *tl);
off = toff;
siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
xfer = NFS_SRVMAXDATA(nfsd);
if (cnt > xfer)
cnt = xfer;
if (siz > xfer)
siz = xfer;
fullsiz = siz;
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
if (!error && vp->v_type != VDIR) {
error = ENOTDIR;
vput(vp);
vp = NULL;
}
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
error = getret = VOP_GETATTR(vp, &at, cred);
#if 0
/*
* XXX This check may be too strict for Solaris 2.5 clients.
*/
if (!error && toff && verf && verf != at.va_filerev)
error = NFSERR_BAD_COOKIE;
#endif
if (!error)
error = nfsrv_access(vp, VEXEC, cred, rdonly, 0);
if (error) {
vput(vp);
vp = NULL;
nfsm_reply(NFSX_V3POSTOPATTR);
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
VOP_UNLOCK(vp, 0);
rbuf = malloc(siz, M_TEMP, M_WAITOK);
again:
iv.iov_base = rbuf;
iv.iov_len = fullsiz;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_offset = (off_t)off;
io.uio_resid = fullsiz;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
io.uio_td = NULL;
eofflag = 0;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (cookies) {
free((caddr_t)cookies, M_TEMP);
cookies = NULL;
}
error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies);
off = (u_quad_t)io.uio_offset;
getret = VOP_GETATTR(vp, &at, cred);
VOP_UNLOCK(vp, 0);
if (!cookies && !error)
error = NFSERR_PERM;
if (!error)
error = getret;
if (error) {
vrele(vp);
vp = NULL;
if (cookies)
free((caddr_t)cookies, M_TEMP);
free((caddr_t)rbuf, M_TEMP);
nfsm_reply(NFSX_V3POSTOPATTR);
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
if (io.uio_resid) {
siz -= io.uio_resid;
/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vrele(vp);
vp = NULL;
nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF +
2 * NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
tl += 2;
*tl++ = nfsrv_nfs_false;
*tl = nfsrv_nfs_true;
free((caddr_t)cookies, M_TEMP);
free((caddr_t)rbuf, M_TEMP);
error = 0;
goto nfsmout;
}
}
/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
cpos = rbuf;
cend = rbuf + siz;
dp = (struct dirent *)cpos;
cookiep = cookies;
/*
* For some reason FreeBSD's ufs_readdir() chooses to back the
* directory offset up to a block boundary, so it is necessary to
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
((u_quad_t)(*cookiep)) <= toff)) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
if (cpos >= cend || ncookies == 0) {
toff = off;
siz = fullsiz;
goto again;
}
/*
* Probe one of the directory entries to see if the filesystem
* supports VGET.
*/
if (VFS_VGET(vp->v_mount, dp->d_fileno, LK_EXCLUSIVE, &nvp) ==
EOPNOTSUPP) {
error = NFSERR_NOTSUPP;
vrele(vp);
vp = NULL;
free((caddr_t)cookies, M_TEMP);
free((caddr_t)rbuf, M_TEMP);
nfsm_reply(NFSX_V3POSTOPATTR);
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
vput(nvp);
nvp = NULL;
dirlen = len = NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF +
2 * NFSX_UNSIGNED;
nfsm_reply(cnt);
nfsm_srvpostop_attr(getret, &at);
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
mp = mb;
bp = bpos;
be = bp + M_TRAILINGSPACE(mp);
/* Loop through the records and build reply */
while (cpos < cend && ncookies > 0) {
if (dp->d_fileno != 0 && dp->d_type != DT_WHT) {
nlen = dp->d_namlen;
rem = nfsm_rndup(nlen)-nlen;
/*
* For readdir_and_lookup get the vnode using
* the file number.
*/
if (VFS_VGET(vp->v_mount, dp->d_fileno, LK_EXCLUSIVE,
&nvp))
goto invalid;
bzero((caddr_t)nfhp, NFSX_V3FH);
nfhp->fh_fsid =
nvp->v_mount->mnt_stat.f_fsid;
/*
* XXXRW: Assert the mountpoints are the same so that
* we know that acquiring Giant based on the
* directory is the right thing for the child.
*/
KASSERT(nvp->v_mount == vp->v_mount,
("nfsrv_readdirplus: nvp mount != vp mount"));
if (VOP_VPTOFH(nvp, &nfhp->fh_fid)) {
vput(nvp);
nvp = NULL;
goto invalid;
}
if (VOP_GETATTR(nvp, vap, cred)) {
vput(nvp);
nvp = NULL;
goto invalid;
}
vput(nvp);
nvp = NULL;
/*
* If either the dircount or maxcount will be
* exceeded, get out now. Both of these lengths
* are calculated conservatively, including all
* XDR overheads.
*/
len += (8 * NFSX_UNSIGNED + nlen + rem + NFSX_V3FH +
NFSX_V3POSTOPATTR);
dirlen += (6 * NFSX_UNSIGNED + nlen + rem);
if (len > cnt || dirlen > fullsiz) {
eofflag = 0;
break;
}
/*
* Build the directory record xdr from
* the dirent entry.
*/
fp = (struct nfs_fattr *)&fl.fl_fattr;
nfsm_srvfillattr(vap, fp);
fl.fl_fhsize = txdr_unsigned(NFSX_V3FH);
fl.fl_fhok = nfsrv_nfs_true;
fl.fl_postopok = nfsrv_nfs_true;
fl.fl_off.nfsuquad[0] = 0;
fl.fl_off.nfsuquad[1] = txdr_unsigned(*cookiep);
nfsm_clget;
*tl = nfsrv_nfs_true;
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = 0;
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(dp->d_fileno);
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(nlen);
bp += NFSX_UNSIGNED;
/* And loop around copying the name */
xfer = nlen;
cp = dp->d_name;
while (xfer > 0) {
nfsm_clget;
if ((bp + xfer) > be)
tsiz = be - bp;
else
tsiz = xfer;
bcopy(cp, bp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
/* And null pad to an int32_t boundary. */
for (i = 0; i < rem; i++)
*bp++ = '\0';
/*
* Now copy the flrep structure out.
*/
xfer = sizeof (struct flrep);
cp = (caddr_t)&fl;
while (xfer > 0) {
nfsm_clget;
if ((bp + xfer) > be)
tsiz = be - bp;
else
tsiz = xfer;
bcopy(cp, bp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
}
invalid:
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
vrele(vp);
vp = NULL;
nfsm_clget;
*tl = nfsrv_nfs_false;
bp += NFSX_UNSIGNED;
nfsm_clget;
if (eofflag)
*tl = nfsrv_nfs_true;
else
*tl = nfsrv_nfs_false;
bp += NFSX_UNSIGNED;
if (mp != mb) {
if (bp < be)
mp->m_len = bp - mtod(mp, caddr_t);
} else
mp->m_len += bp - bpos;
free((caddr_t)cookies, M_TEMP);
free((caddr_t)rbuf, M_TEMP);
nfsmout:
if (vp)
vrele(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs commit service
*/
int
nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct vattr bfor, aft;
struct vnode *vp = NULL;
nfsfh_t nfh;
fhandle_t *fhp;
u_int32_t *tl;
caddr_t bpos;
int error = 0, rdonly, for_ret = 1, aft_ret = 1, cnt;
struct mbuf *mb, *mreq;
u_quad_t off;
struct mount *mp = NULL;
int v3 = (nfsd->nd_flag & ND_NFSV3);
int tvfslocked;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
if (!v3)
panic("nfsrv_commit: v3 proc called on a v2 connection");
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
error = ESTALE;
goto ereply;
}
vfslocked = VFS_LOCK_GIANT(mp);
(void) vn_start_write(NULL, &mp, V_WAIT);
vfs_rel(mp); /* The write holds a ref. */
tl = nfsm_dissect_nonblock(u_int32_t *, 3 * NFSX_UNSIGNED);
/*
* XXX At this time VOP_FSYNC() does not accept offset and byte
* count parameters, so these arguments are useless (someday maybe).
*/
off = fxdr_hyper(tl);
tl += 2;
cnt = fxdr_unsigned(int, *tl);
error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp,
nam, &rdonly, TRUE);
vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft);
error = 0;
goto nfsmout;
}
for_ret = VOP_GETATTR(vp, &bfor, cred);
if (cnt > MAX_COMMIT_COUNT) {
/*
* Give up and do the whole thing
*/
if (vp->v_object &&
(vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
VM_OBJECT_LOCK(vp->v_object);
vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
VM_OBJECT_UNLOCK(vp->v_object);
}
error = VOP_FSYNC(vp, MNT_WAIT, curthread);
} else {
/*
* Locate and synchronously write any buffers that fall
* into the requested range. Note: we are assuming that
* f_iosize is a power of 2.
*/
int iosize = vp->v_mount->mnt_stat.f_iosize;
int iomask = iosize - 1;
struct bufobj *bo;
daddr_t lblkno;
/*
* Align to iosize boundry, super-align to page boundry.
*/
if (off & iomask) {
cnt += off & iomask;
off &= ~(u_quad_t)iomask;
}
if (off & PAGE_MASK) {
cnt += off & PAGE_MASK;
off &= ~(u_quad_t)PAGE_MASK;
}
lblkno = off / iosize;
if (vp->v_object &&
(vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
VM_OBJECT_LOCK(vp->v_object);
vm_object_page_clean(vp->v_object, off / PAGE_SIZE, (cnt + PAGE_MASK) / PAGE_SIZE, OBJPC_SYNC);
VM_OBJECT_UNLOCK(vp->v_object);
}
bo = &vp->v_bufobj;
BO_LOCK(bo);
while (cnt > 0) {
struct buf *bp;
/*
* If we have a buffer and it is marked B_DELWRI we
* have to lock and write it. Otherwise the prior
* write is assumed to have already been committed.
*
* gbincore() can return invalid buffers now so we
* have to check that bit as well (though B_DELWRI
* should not be set if B_INVAL is set there could be
* a race here since we haven't locked the buffer).
*/
if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
LK_INTERLOCK, BO_MTX(bo)) == ENOLCK) {
BO_LOCK(bo);
continue; /* retry */
}
if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
B_DELWRI) {
bremfree(bp);
bp->b_flags &= ~B_ASYNC;
bwrite(bp);
++nfs_commit_miss;
} else
BUF_UNLOCK(bp);
BO_LOCK(bo);
}
++nfs_commit_blks;
if (cnt < iosize)
break;
cnt -= iosize;
++lblkno;
}
BO_UNLOCK(bo);
}
aft_ret = VOP_GETATTR(vp, &aft, cred);
vput(vp);
vp = NULL;
ereply:
nfsm_reply(NFSX_V3WCCDATA + NFSX_V3WRITEVERF);
nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft);
if (!error) {
tl = nfsm_build(u_int32_t *, NFSX_V3WRITEVERF);
if (nfsver.tv_sec == 0)
nfsver = boottime;
*tl++ = txdr_unsigned(nfsver.tv_sec);
*tl = txdr_unsigned(nfsver.tv_usec);
} else {
error = 0;
}
nfsmout:
if (vp)
vput(vp);
vn_finished_write(mp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs statfs service
*/
int
nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct statfs *sf;
struct nfs_statfs *sfp;
caddr_t bpos;
int error = 0, rdonly, getret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq;
struct vnode *vp = NULL;
struct vattr at;
nfsfh_t nfh;
fhandle_t *fhp;
struct statfs statfs;
u_quad_t tval;
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
if (v3)
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
sf = &statfs;
error = VFS_STATFS(vp->v_mount, sf, curthread);
getret = VOP_GETATTR(vp, &at, cred);
vput(vp);
vp = NULL;
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_STATFS(v3));
if (v3)
nfsm_srvpostop_attr(getret, &at);
if (error) {
error = 0;
goto nfsmout;
}
sfp = nfsm_build(struct nfs_statfs *, NFSX_STATFS(v3));
if (v3) {
tval = (u_quad_t)sf->f_blocks;
tval *= (u_quad_t)sf->f_bsize;
txdr_hyper(tval, &sfp->sf_tbytes);
tval = (u_quad_t)sf->f_bfree;
tval *= (u_quad_t)sf->f_bsize;
txdr_hyper(tval, &sfp->sf_fbytes);
/*
* Don't send negative values for available space,
* since this field is unsigned in the NFS protocol.
* Otherwise, the client would see absurdly high
* numbers for free space.
*/
if (sf->f_bavail < 0)
tval = 0;
else
tval = (u_quad_t)sf->f_bavail;
tval *= (u_quad_t)sf->f_bsize;
txdr_hyper(tval, &sfp->sf_abytes);
sfp->sf_tfiles.nfsuquad[0] = 0;
sfp->sf_tfiles.nfsuquad[1] = txdr_unsigned(sf->f_files);
sfp->sf_ffiles.nfsuquad[0] = 0;
sfp->sf_ffiles.nfsuquad[1] = txdr_unsigned(sf->f_ffree);
sfp->sf_afiles.nfsuquad[0] = 0;
sfp->sf_afiles.nfsuquad[1] = txdr_unsigned(sf->f_ffree);
sfp->sf_invarsec = 0;
} else {
sfp->sf_tsize = txdr_unsigned(NFS_MAXDGRAMDATA);
sfp->sf_bsize = txdr_unsigned(sf->f_bsize);
sfp->sf_blocks = txdr_unsigned(sf->f_blocks);
sfp->sf_bfree = txdr_unsigned(sf->f_bfree);
if (sf->f_bavail < 0)
sfp->sf_bavail = 0;
else
sfp->sf_bavail = txdr_unsigned(sf->f_bavail);
}
nfsmout:
if (vp)
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs fsinfo service
*/
int
nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct nfsv3_fsinfo *sip;
caddr_t bpos;
int error = 0, rdonly, getret = 1, pref;
struct mbuf *mb, *mreq;
struct vnode *vp = NULL;
struct vattr at;
nfsfh_t nfh;
fhandle_t *fhp;
u_quad_t maxfsize;
struct statfs sb;
int v3 = (nfsd->nd_flag & ND_NFSV3);
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
if (!v3)
panic("nfsrv_fsinfo: v3 proc called on a v2 connection");
fhp = &nfh.fh_generic;
vfslocked = 0;
nfsm_srvmtofh(fhp);
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
/* XXX Try to make a guess on the max file size. */
VFS_STATFS(vp->v_mount, &sb, curthread);
maxfsize = (u_quad_t)0x80000000 * sb.f_bsize - 1;
getret = VOP_GETATTR(vp, &at, cred);
vput(vp);
vp = NULL;
nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3FSINFO);
nfsm_srvpostop_attr(getret, &at);
sip = nfsm_build(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
/*
* XXX
* There should be filesystem VFS OP(s) to get this information.
* For now, assume ufs.
*/
pref = NFS_SRVMAXDATA(nfsd);
sip->fs_rtmax = txdr_unsigned(pref);
sip->fs_rtpref = txdr_unsigned(pref);
sip->fs_rtmult = txdr_unsigned(NFS_FABLKSIZE);
sip->fs_wtmax = txdr_unsigned(pref);
sip->fs_wtpref = txdr_unsigned(pref);
sip->fs_wtmult = txdr_unsigned(NFS_FABLKSIZE);
sip->fs_dtpref = txdr_unsigned(pref);
txdr_hyper(maxfsize, &sip->fs_maxfilesize);
sip->fs_timedelta.nfsv3_sec = 0;
sip->fs_timedelta.nfsv3_nsec = txdr_unsigned(1);
sip->fs_properties = txdr_unsigned(NFSV3FSINFO_LINK |
NFSV3FSINFO_SYMLINK | NFSV3FSINFO_HOMOGENEOUS |
NFSV3FSINFO_CANSETTIME);
nfsmout:
if (vp)
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* nfs pathconf service
*/
int
nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct sockaddr *nam = nfsd->nd_nam;
caddr_t dpos = nfsd->nd_dpos;
struct ucred *cred = nfsd->nd_cr;
struct nfsv3_pathconf *pc;
caddr_t bpos;
int error = 0, rdonly, getret = 1;
register_t linkmax, namemax, chownres, notrunc;
struct mbuf *mb, *mreq;
struct vnode *vp = NULL;
struct vattr at;
nfsfh_t nfh;
fhandle_t *fhp;
int v3 = (nfsd->nd_flag & ND_NFSV3);
int vfslocked;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
if (!v3)
panic("nfsrv_pathconf: v3 proc called on a v2 connection");
vfslocked = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
error = VOP_PATHCONF(vp, _PC_LINK_MAX, &linkmax);
if (!error)
error = VOP_PATHCONF(vp, _PC_NAME_MAX, &namemax);
if (!error)
error = VOP_PATHCONF(vp, _PC_CHOWN_RESTRICTED, &chownres);
if (!error)
error = VOP_PATHCONF(vp, _PC_NO_TRUNC, &notrunc);
getret = VOP_GETATTR(vp, &at, cred);
vput(vp);
vp = NULL;
nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3PATHCONF);
nfsm_srvpostop_attr(getret, &at);
if (error) {
error = 0;
goto nfsmout;
}
pc = nfsm_build(struct nfsv3_pathconf *, NFSX_V3PATHCONF);
pc->pc_linkmax = txdr_unsigned(linkmax);
pc->pc_namemax = txdr_unsigned(namemax);
pc->pc_notrunc = txdr_unsigned(notrunc);
pc->pc_chownrestricted = txdr_unsigned(chownres);
/*
* These should probably be supported by VOP_PATHCONF(), but
* until msdosfs is exportable (why would you want to?), the
* Unix defaults should be ok.
*/
pc->pc_caseinsensitive = nfsrv_nfs_false;
pc->pc_casepreserving = nfsrv_nfs_true;
nfsmout:
if (vp)
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
return(error);
}
/*
* Null operation, used by clients to ping server
*/
/* ARGSUSED */
int
nfsrv_null(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep;
caddr_t bpos;
int error = NFSERR_RETVOID;
struct mbuf *mb, *mreq;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
nfsm_reply(0);
nfsmout:
return (error);
}
/*
* No operation, used for obsolete procedures
*/
/* ARGSUSED */
int
nfsrv_noop(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep;
caddr_t bpos;
int error;
struct mbuf *mb, *mreq;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
if (nfsd->nd_repstat)
error = nfsd->nd_repstat;
else
error = EPROCUNAVAIL;
nfsm_reply(0);
error = 0;
nfsmout:
return (error);
}
/*
* Perform access checking for vnodes obtained from file handles that would
* refer to files already opened by a Unix client. You cannot just use
* vn_writechk() and VOP_ACCESS() for two reasons.
* 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
* case.
* 2 - The owner is to be given access irrespective of mode bits for some
* operations, so that processes that chmod after opening a file don't
* break. I don't like this because it opens a security hole, but since
* the nfs server opens a security hole the size of a barn door anyhow,
* what the heck.
*
* The exception to rule 2 is EPERM. If a file is IMMUTABLE, VOP_ACCESS()
* will return EPERM instead of EACCESS. EPERM is always an error.
*/
static int
nfsrv_access(struct vnode *vp, accmode_t accmode, struct ucred *cred,
int rdonly, int override)
{
struct vattr vattr;
int error;
VFS_ASSERT_GIANT(vp->v_mount);
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
if (accmode & VWRITE) {
/* Just vn_writechk() changed to check rdonly */
/*
* Disallow write attempts on read-only filesystems;
* unless the file is a socket or a block or character
* device resident on the filesystem.
*/
if (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
}
/*
* If there's shared text associated with
* the inode, we can't allow writing.
*/
if (vp->v_vflag & VV_TEXT)
return (ETXTBSY);
}
error = VOP_GETATTR(vp, &vattr, cred);
if (error)
return (error);
error = VOP_ACCESS(vp, accmode, cred, curthread);
/*
* Allow certain operations for the owner (reads and writes
* on files that are already open).
*/
if (override && error == EACCES && cred->cr_uid == vattr.va_uid)
error = 0;
return (error);
}
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