d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
e994f7e84b
freebsd-skq/sys/nfsserver/nfs_serv.c
jhb c2c01f044f Initialize vfslocked to 0 before nfsm_srvmtofh() so that the variable is 
not used uninitialized in 'nfsmout' if nfsm_srvmtofh() gets an internal
error.

CID:		1766
Found by:	Coverity Prevent (tm)
2007-03-26 15:14:58 +00:00

4284 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/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, "");
SYSCTL_INT(_vfs_nfsrv, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks, 0, "");
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_RD,
&nfsrvstats, nfsrvstats, "S,nfsrvstats");
static int nfsrv_access(struct vnode *, int, struct ucred *, int,
struct thread *, int);
static void nfsrvw_coalesce(struct nfsrv_descript *,
struct nfsrv_descript *);
/*
* 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 thread *td, 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");
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED);
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, cred, 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, td, 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, td, 0))
nfsmode &= ~testmode;
if (vp->v_type == VDIR)
testmode = NFSV3ACCESS_LOOKUP;
else
testmode = NFSV3ACCESS_EXECUTE;
if ((nfsmode & testmode) &&
nfsrv_access(vp, VEXEC, cred, rdonly, td, 0))
nfsmode &= ~testmode;
getret = VOP_GETATTR(vp, vap, cred, td);
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 thread *td, 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, cred, slp, nam,
&rdonly, TRUE);
if (error) {
nfsm_reply(0);
error = 0;
goto nfsmout;
}
error = VOP_GETATTR(vp, vap, cred, td);
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 thread *td, 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;
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, cred, 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, td);
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,
td, 0)) != 0)
goto out;
}
error = VOP_SETATTR(vp, vap, cred, td);
postat_ret = VOP_GETATTR(vp, vap, cred, td);
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 thread *td, 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, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirattr, &dirattr_ret, td, 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, td);
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, td);
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 thread *td, 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_TRYWAIT, MT_DATA);
MCLGET(nmp, M_TRYWAIT);
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, cred, 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, td);
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 thread *td, 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, cred, 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,
td, 1)) != 0)
error = nfsrv_access(vp, VEXEC, cred,
rdonly, td, 1);
}
getret = VOP_GETATTR(vp, vap, cred, td);
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_TRYWAIT, MT_DATA);
MCLGET(m, M_TRYWAIT);
m->m_len = 0;
m2->m_next = m;
m2 = m;
}
}
MALLOC(iv, struct iovec *, 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, td))) {
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 thread *td, 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, cred, 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, td);
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, td, 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) {
MALLOC(ivp, struct iovec *, 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);
/* XXXRW: unlocked write. */
nfsrvstats.srvvop_writes++;
FREE((caddr_t)iv, M_TEMP);
}
aftat_ret = VOP_GETATTR(vp, vap, cred, td);
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);
}
/*
* 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 thread *td, 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
*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, cred,
slp, nfsd->nd_nam, &rdonly, TRUE);
if (!error) {
if (v3)
forat_ret = VOP_GETATTR(vp, &forat, cred, td);
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,
td, 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;
MALLOC(iov, struct iovec *, 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, td);
error = vn_start_write(NULL, &mntp, V_WAIT);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
}
mvfslocked = VFS_LOCK_GIANT(mntp);
}
if (!error) {
error = VOP_WRITE(vp, uiop, ioflags, cred);
/* XXXRW: 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, td);
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);
}
}
/*
* 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 thread *td, 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, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, td, 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,
td);
}
}
} 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 = suser_cred(cred, 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 = td;
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), td, 0);
if (!error) {
tempsize = vap->va_size;
VATTR_NULL(vap);
vap->va_size = tempsize;
error = VOP_SETATTR(nd.ni_vp, vap, cred,
td);
}
}
}
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, td);
}
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, td);
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, td);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
VOP_UNLOCK(dirp, 0, td);
}
}
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 thread *td, 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;
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, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, td, 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 = suser_cred(cred, 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, td);
}
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, td);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
VOP_UNLOCK(dirp, 0, td);
}
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 thread *td, 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, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, td, FALSE);
vfslocked = NDHASGIANT(&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, td);
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, td);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
VOP_UNLOCK(dirp, 0, td);
}
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 thread *td, 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, ffhp, len, slp, nam, &md,
&dpos, &fdirp, v3, &fdirfor, &fdirfor_ret, td, 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, tfhp, len2, slp, nam, &md,
&dpos, &tdirp, v3, &tdirfor, &tdirfor_ret, td, 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, td);
fdiraft_ret = VOP_GETATTR(fdirp, &fdiraft, cred, td);
VOP_UNLOCK(fdirp, 0, td);
}
if (tdirp) {
vn_lock(tdirp, LK_EXCLUSIVE | LK_RETRY, td);
tdiraft_ret = VOP_GETATTR(tdirp, &tdiraft, cred, td);
VOP_UNLOCK(tdirp, 0, td);
}
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 thread *td, 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, cred, 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, td);
if (vp->v_type == VDIR) {
error = EPERM; /* POSIX */
goto out1;
}
VOP_UNLOCK(vp, 0, td);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | MPSAFE | MPSAFE;
error = nfs_namei(&nd, dfhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, td, 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, td);
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, td);
out2:
if (dirp) {
if (dirp == nd.ni_dvp)
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
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, td);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
VOP_UNLOCK(dirp, 0, td);
}
}
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 thread *td, 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, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, td, 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;
MALLOC(pathcp, caddr_t, 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 = td;
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,
td);
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, td);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
VOP_UNLOCK(dirp, 0, td);
}
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 thread *td, 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, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, td, 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, td);
}
out:
if (dirp) {
if (dirp == nd.ni_dvp) {
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
} 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, td);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
VOP_UNLOCK(dirp, 0, td);
}
}
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 thread *td, 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, fhp, len, slp, nam, &md, &dpos,
&dirp, v3, &dirfor, &dirfor_ret, td, 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, td);
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, td);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred, td);
VOP_UNLOCK(dirp, 0, td);
}
}
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 thread *td, 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, cred, 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, td);
#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, td, 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, td);
/*
* end section. Allocate rbuf and continue
*/
MALLOC(rbuf, caddr_t, 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, td);
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, td);
if (!error)
error = getret;
}
VOP_UNLOCK(vp, 0, td);
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 thread *td, 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, cred, 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, td);
#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, td, 0);
if (error) {
vput(vp);
vp = NULL;
nfsm_reply(NFSX_V3POSTOPATTR);
nfsm_srvpostop_attr(getret, &at);
error = 0;
goto nfsmout;
}
VOP_UNLOCK(vp, 0, td);
MALLOC(rbuf, caddr_t, 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, td);
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, td);
VOP_UNLOCK(vp, 0, td);
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, td)) {
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 thread *td, 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, cred, 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, td);
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, td);
} 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;
int s;
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);
}
s = splbio();
VI_LOCK(vp);
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, VI_MTX(vp)) == ENOLCK) {
VI_LOCK(vp);
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);
VI_LOCK(vp);
}
++nfs_commit_blks;
if (cnt < iosize)
break;
cnt -= iosize;
++lblkno;
}
VI_UNLOCK(vp);
splx(s);
}
aft_ret = VOP_GETATTR(vp, &aft, cred, td);
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 thread *td, 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, cred, 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, td);
getret = VOP_GETATTR(vp, &at, cred, td);
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 thread *td, 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, cred, 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, td);
maxfsize = (u_quad_t)0x80000000 * sb.f_bsize - 1;
getret = VOP_GETATTR(vp, &at, cred, td);
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.
*/
if (slp->ns_so->so_type == SOCK_DGRAM)
pref = NFS_MAXDGRAMDATA;
else
pref = NFS_MAXDATA;
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 thread *td, 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");
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, cred, 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, td);
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 thread *td, 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 thread *td, 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, int flags, struct ucred *cred,
int rdonly, struct thread *td, int override)
{
struct vattr vattr;
int error;
VFS_ASSERT_GIANT(vp->v_mount);
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
if (flags & 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, td);
if (error)
return (error);
error = VOP_ACCESS(vp, flags, cred, td);
/*
* 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);
}
Reference in New Issue View Git Blame Copy Permalink