2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/cdefs.h>
38 * These functions support the macros and help fiddle mbuf chains for
39 * the nfs op functions. They do things like create the rpc header and
40 * copy data between mbuf chains and uio lists.
42 #include <fs/nfs/nfsport.h>
44 extern struct nfsstatsv1 nfsstatsv1;
45 extern int ncl_mbuf_mlen;
46 extern __enum_uint8(vtype) newnv2tov_type[8];
47 extern __enum_uint8(vtype) nv34tov_type[8];
51 * copies a uio scatter/gather list to an mbuf chain.
52 * NOTE: can only handle iovcnt == 1
55 nfsm_uiombuf(struct nfsrv_descript *nd, struct uio *uiop, int siz)
58 struct mbuf *mp, *mp2;
60 int uiosiz, clflg, rem;
63 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));
65 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */
69 rem = NFSM_RNDUP(siz) - siz;
73 KASSERT((nd->nd_flag & ND_EXTPG) != 0 || mcp ==
74 mtod(mp, char *) + mp->m_len, ("nfsm_uiombuf: mcp wrong"));
75 left = uiop->uio_iov->iov_len;
76 uiocp = uiop->uio_iov->iov_base;
81 if ((nd->nd_flag & ND_EXTPG) != 0)
82 mlen = nd->nd_bextpgsiz;
84 mlen = M_TRAILINGSPACE(mp);
86 if ((nd->nd_flag & ND_EXTPG) != 0) {
87 mp = nfsm_add_ext_pgs(mp,
88 nd->nd_maxextsiz, &nd->nd_bextpg);
89 mcp = (char *)(void *)PHYS_TO_DMAP(
90 mp->m_epg_pa[nd->nd_bextpg]);
91 nd->nd_bextpgsiz = mlen = PAGE_SIZE;
94 NFSMCLGET(mp, M_WAITOK);
98 mlen = M_TRAILINGSPACE(mp);
99 mcp = mtod(mp, char *);
104 xfer = (left > mlen) ? mlen : left;
105 if (uiop->uio_segflg == UIO_SYSSPACE)
106 NFSBCOPY(uiocp, mcp, xfer);
108 copyin(uiocp, mcp, xfer);
113 if ((nd->nd_flag & ND_EXTPG) != 0) {
114 nd->nd_bextpgsiz -= xfer;
115 mp->m_epg_last_len += xfer;
117 uiop->uio_offset += xfer;
118 uiop->uio_resid -= xfer;
120 tcp = (char *)uiop->uio_iov->iov_base;
122 uiop->uio_iov->iov_base = (void *)tcp;
123 uiop->uio_iov->iov_len -= uiosiz;
127 if ((nd->nd_flag & ND_EXTPG) == 0 && rem >
128 M_TRAILINGSPACE(mp)) {
132 mcp = mtod(mp, char *);
133 } else if ((nd->nd_flag & ND_EXTPG) != 0 && rem >
135 mp = nfsm_add_ext_pgs(mp, nd->nd_maxextsiz,
137 mcp = (char *)(void *)
138 PHYS_TO_DMAP(mp->m_epg_pa[nd->nd_bextpg]);
139 nd->nd_bextpgsiz = PAGE_SIZE;
141 for (left = 0; left < rem; left++)
144 if ((nd->nd_flag & ND_EXTPG) != 0) {
145 nd->nd_bextpgsiz -= rem;
146 mp->m_epg_last_len += rem;
154 * copies a uio scatter/gather list to an mbuf chain.
155 * This version returns the mbuf list and does not use "nd".
156 * NOTE: can only handle iovcnt == 1
159 nfsm_uiombuflist(struct uio *uiop, int siz, u_int maxext)
162 struct mbuf *mp, *mp2, *firstmp;
163 int extpg, extpgsiz = 0, i, left, mlen, rem, xfer;
167 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));
170 mp = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK);
171 mcp = (char *)(void *)PHYS_TO_DMAP(mp->m_epg_pa[0]);
173 extpgsiz = PAGE_SIZE;
175 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */
180 NFSMCLGET(mp, M_WAITOK);
183 mcp = mtod(mp, char *);
187 rem = NFSM_RNDUP(siz) - siz;
189 left = uiop->uio_iov->iov_len;
190 uiocp = uiop->uio_iov->iov_base;
198 mlen = M_TRAILINGSPACE(mp);
201 mp = nfsm_add_ext_pgs(mp, maxext,
203 mlen = extpgsiz = PAGE_SIZE;
204 mcp = (char *)(void *)PHYS_TO_DMAP(
205 mp->m_epg_pa[extpg]);
208 NFSMCLGET(mp, M_WAITOK);
211 mcp = mtod(mp, char *);
212 mlen = M_TRAILINGSPACE(mp);
218 xfer = (left > mlen) ? mlen : left;
219 if (uiop->uio_segflg == UIO_SYSSPACE)
220 NFSBCOPY(uiocp, mcp, xfer);
222 copyin(uiocp, mcp, xfer);
227 mp->m_epg_last_len += xfer;
231 uiop->uio_offset += xfer;
232 uiop->uio_resid -= xfer;
234 tcp = (char *)uiop->uio_iov->iov_base;
236 uiop->uio_iov->iov_base = (void *)tcp;
237 uiop->uio_iov->iov_len -= uiosiz;
241 KASSERT((mp->m_flags & M_EXTPG) != 0 ||
242 rem <= M_TRAILINGSPACE(mp),
243 ("nfsm_uiombuflist: no space for padding"));
244 for (i = 0; i < rem; i++)
248 mp->m_epg_last_len += rem;
254 * Load vnode attributes from the xdr file attributes.
255 * Returns EBADRPC if they can't be parsed, 0 otherwise.
258 nfsm_loadattr(struct nfsrv_descript *nd, struct nfsvattr *nap)
260 struct nfs_fattr *fp;
263 if (nd->nd_flag & ND_NFSV4) {
264 error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL,
265 NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
266 } else if (nd->nd_flag & ND_NFSV3) {
267 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V3FATTR);
268 nap->na_type = nfsv34tov_type(fp->fa_type);
269 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode);
270 nap->na_rdev = NFSMAKEDEV(
271 fxdr_unsigned(int, fp->fa3_rdev.specdata1),
272 fxdr_unsigned(int, fp->fa3_rdev.specdata2));
273 nap->na_nlink = fxdr_unsigned(uint32_t, fp->fa_nlink);
274 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid);
275 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid);
276 nap->na_size = fxdr_hyper(&fp->fa3_size);
277 nap->na_blocksize = NFS_FABLKSIZE;
278 nap->na_bytes = fxdr_hyper(&fp->fa3_used);
279 nap->na_fileid = fxdr_hyper(&fp->fa3_fileid);
280 fxdr_nfsv3time(&fp->fa3_atime, &nap->na_atime);
281 fxdr_nfsv3time(&fp->fa3_ctime, &nap->na_ctime);
282 fxdr_nfsv3time(&fp->fa3_mtime, &nap->na_mtime);
283 nap->na_btime.tv_sec = -1;
284 nap->na_btime.tv_nsec = 0;
289 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V2FATTR);
290 nap->na_type = nfsv2tov_type(fp->fa_type);
291 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode);
292 if (nap->na_type == VNON || nap->na_type == VREG)
293 nap->na_type = IFTOVT(nap->na_mode);
294 nap->na_rdev = fxdr_unsigned(dev_t, fp->fa2_rdev);
297 * Really ugly NFSv2 kludge.
299 if (nap->na_type == VCHR && nap->na_rdev == ((dev_t)-1))
300 nap->na_type = VFIFO;
301 nap->na_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
302 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid);
303 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid);
304 nap->na_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
305 nap->na_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
307 (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) *
309 nap->na_fileid = fxdr_unsigned(uint64_t, fp->fa2_fileid);
310 fxdr_nfsv2time(&fp->fa2_atime, &nap->na_atime);
311 fxdr_nfsv2time(&fp->fa2_mtime, &nap->na_mtime);
313 nap->na_ctime.tv_sec = fxdr_unsigned(u_int32_t,
314 fp->fa2_ctime.nfsv2_sec);
315 nap->na_ctime.tv_nsec = 0;
316 nap->na_btime.tv_sec = -1;
317 nap->na_btime.tv_nsec = 0;
318 nap->na_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
326 * Gets a file handle out of an nfs reply sent to the client and returns
327 * the file handle and the file's attributes.
328 * For V4, it assumes that Getfh and Getattr Op's results are here.
331 nfscl_mtofh(struct nfsrv_descript *nd, struct nfsfh **nfhpp,
332 struct nfsvattr *nap, int *attrflagp)
335 int error = 0, flag = 1;
340 * First get the file handle and vnode.
342 if (nd->nd_flag & ND_NFSV3) {
343 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
344 flag = fxdr_unsigned(int, *tl);
345 } else if (nd->nd_flag & ND_NFSV4) {
346 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
347 /* If the GetFH failed, clear flag. */
349 nd->nd_flag |= ND_NOMOREDATA;
351 error = ENXIO; /* Return ENXIO so *nfhpp isn't used. */
355 error = nfsm_getfh(nd, nfhpp);
361 * Now, get the attributes.
363 if (flag != 0 && (nd->nd_flag & ND_NFSV4) != 0) {
364 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
366 nd->nd_flag |= ND_NOMOREDATA;
369 } else if (nd->nd_flag & ND_NFSV3) {
370 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
372 flag = fxdr_unsigned(int, *tl);
373 } else if (fxdr_unsigned(int, *tl)) {
374 error = nfsm_advance(nd, NFSX_V3FATTR, -1);
380 error = nfsm_loadattr(nd, nap);
389 * Initialize the owner/delegation sleep lock.
392 nfscl_lockinit(struct nfsv4lock *lckp)
395 lckp->nfslock_usecnt = 0;
396 lckp->nfslock_lock = 0;
400 * Get an exclusive lock. (Not needed for OpenBSD4, since there is only one
401 * thread for each posix process in the kernel.)
404 nfscl_lockexcl(struct nfsv4lock *lckp, void *mutex)
409 igotlock = nfsv4_lock(lckp, 1, NULL, mutex, NULL);
414 * Release an exclusive lock.
417 nfscl_lockunlock(struct nfsv4lock *lckp)
420 nfsv4_unlock(lckp, 0);
424 * Called to dereference a lock on a stateid (delegation or open owner).
427 nfscl_lockderef(struct nfsv4lock *lckp)
431 lckp->nfslock_usecnt--;
432 if (lckp->nfslock_usecnt == 0 && (lckp->nfslock_lock & NFSV4LOCK_WANTED)) {
433 lckp->nfslock_lock &= ~NFSV4LOCK_WANTED;
434 wakeup((caddr_t)lckp);