FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_common.c
1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: releng/5.1/sys/nfs/nfs_common.c 111119 2003-02-19 05:47:46Z imp $");
41
42 /*
43 * These functions support the macros and help fiddle mbuf chains for
44 * the nfs op functions. They do things like create the rpc header and
45 * copy data between mbuf chains and uio lists.
46 */
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/kernel.h>
51 #include <sys/bio.h>
52 #include <sys/buf.h>
53 #include <sys/proc.h>
54 #include <sys/mount.h>
55 #include <sys/vnode.h>
56 #include <sys/namei.h>
57 #include <sys/mbuf.h>
58 #include <sys/socket.h>
59 #include <sys/stat.h>
60 #include <sys/malloc.h>
61 #include <sys/sysent.h>
62 #include <sys/syscall.h>
63
64 #include <vm/vm.h>
65 #include <vm/vm_object.h>
66 #include <vm/vm_extern.h>
67
68 #include <nfs/rpcv2.h>
69 #include <nfs/nfsproto.h>
70 #include <nfsserver/nfs.h>
71 #include <nfs/xdr_subs.h>
72 #include <nfs/nfs_common.h>
73
74 #include <netinet/in.h>
75
76 enum vtype nv3tov_type[8]= {
77 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO
78 };
79 nfstype nfsv3_type[9] = {
80 NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK, NFFIFO, NFNON
81 };
82
83 u_quad_t
84 nfs_curusec(void)
85 {
86 struct timeval tv;
87
88 getmicrotime(&tv);
89 return ((u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec);
90 }
91
92 /*
93 * copies mbuf chain to the uio scatter/gather list
94 */
95 int
96 nfsm_mbuftouio(struct mbuf **mrep, struct uio *uiop, int siz, caddr_t *dpos)
97 {
98 char *mbufcp, *uiocp;
99 int xfer, left, len;
100 struct mbuf *mp;
101 long uiosiz, rem;
102 int error = 0;
103
104 mp = *mrep;
105 mbufcp = *dpos;
106 len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
107 rem = nfsm_rndup(siz)-siz;
108 while (siz > 0) {
109 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
110 return (EFBIG);
111 left = uiop->uio_iov->iov_len;
112 uiocp = uiop->uio_iov->iov_base;
113 if (left > siz)
114 left = siz;
115 uiosiz = left;
116 while (left > 0) {
117 while (len == 0) {
118 mp = mp->m_next;
119 if (mp == NULL)
120 return (EBADRPC);
121 mbufcp = mtod(mp, caddr_t);
122 len = mp->m_len;
123 }
124 xfer = (left > len) ? len : left;
125 #ifdef notdef
126 /* Not Yet.. */
127 if (uiop->uio_iov->iov_op != NULL)
128 (*(uiop->uio_iov->iov_op))
129 (mbufcp, uiocp, xfer);
130 else
131 #endif
132 if (uiop->uio_segflg == UIO_SYSSPACE)
133 bcopy(mbufcp, uiocp, xfer);
134 else
135 copyout(mbufcp, uiocp, xfer);
136 left -= xfer;
137 len -= xfer;
138 mbufcp += xfer;
139 uiocp += xfer;
140 uiop->uio_offset += xfer;
141 uiop->uio_resid -= xfer;
142 }
143 if (uiop->uio_iov->iov_len <= siz) {
144 uiop->uio_iovcnt--;
145 uiop->uio_iov++;
146 } else {
147 uiop->uio_iov->iov_base =
148 (char *)uiop->uio_iov->iov_base + uiosiz;
149 uiop->uio_iov->iov_len -= uiosiz;
150 }
151 siz -= uiosiz;
152 }
153 *dpos = mbufcp;
154 *mrep = mp;
155 if (rem > 0) {
156 if (len < rem)
157 error = nfs_adv(mrep, dpos, rem, len);
158 else
159 *dpos += rem;
160 }
161 return (error);
162 }
163
164 /*
165 * Help break down an mbuf chain by setting the first siz bytes contiguous
166 * pointed to by returned val.
167 * This is used by the macros nfsm_dissect for tough
168 * cases. (The macros use the vars. dpos and dpos2)
169 */
170 void *
171 nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left)
172 {
173 struct mbuf *mp, *mp2;
174 int siz2, xfer;
175 caddr_t ptr;
176 void *ret;
177
178 mp = *mdp;
179 while (left == 0) {
180 *mdp = mp = mp->m_next;
181 if (mp == NULL)
182 return NULL;
183 left = mp->m_len;
184 *dposp = mtod(mp, caddr_t);
185 }
186 if (left >= siz) {
187 ret = *dposp;
188 *dposp += siz;
189 } else if (mp->m_next == NULL) {
190 return NULL;
191 } else if (siz > MHLEN) {
192 panic("nfs S too big");
193 } else {
194 MGET(mp2, M_TRYWAIT, MT_DATA);
195 mp2->m_next = mp->m_next;
196 mp->m_next = mp2;
197 mp->m_len -= left;
198 mp = mp2;
199 ptr = mtod(mp, caddr_t);
200 ret = ptr;
201 bcopy(*dposp, ptr, left); /* Copy what was left */
202 siz2 = siz-left;
203 ptr += left;
204 mp2 = mp->m_next;
205 /* Loop around copying up the siz2 bytes */
206 while (siz2 > 0) {
207 if (mp2 == NULL)
208 return NULL;
209 xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
210 if (xfer > 0) {
211 bcopy(mtod(mp2, caddr_t), ptr, xfer);
212 mp2->m_data += xfer;
213 mp2->m_len -= xfer;
214 ptr += xfer;
215 siz2 -= xfer;
216 }
217 if (siz2 > 0)
218 mp2 = mp2->m_next;
219 }
220 mp->m_len = siz;
221 *mdp = mp2;
222 *dposp = mtod(mp2, caddr_t);
223 }
224 return ret;
225 }
226
227 /*
228 * Advance the position in the mbuf chain.
229 */
230 int
231 nfs_adv(struct mbuf **mdp, caddr_t *dposp, int offs, int left)
232 {
233 struct mbuf *m;
234 int s;
235
236 m = *mdp;
237 s = left;
238 while (s < offs) {
239 offs -= s;
240 m = m->m_next;
241 if (m == NULL)
242 return (EBADRPC);
243 s = m->m_len;
244 }
245 *mdp = m;
246 *dposp = mtod(m, caddr_t)+offs;
247 return (0);
248 }
249
250 void *
251 nfsm_build_xx(int s, struct mbuf **mb, caddr_t *bpos)
252 {
253 struct mbuf *mb2;
254 void *ret;
255
256 if (s > M_TRAILINGSPACE(*mb)) {
257 MGET(mb2, M_TRYWAIT, MT_DATA);
258 if (s > MLEN)
259 panic("build > MLEN");
260 (*mb)->m_next = mb2;
261 *mb = mb2;
262 (*mb)->m_len = 0;
263 *bpos = mtod(*mb, caddr_t);
264 }
265 ret = *bpos;
266 (*mb)->m_len += s;
267 *bpos += s;
268 return ret;
269 }
270
271 void *
272 nfsm_dissect_xx(int s, struct mbuf **md, caddr_t *dpos)
273 {
274 int t1;
275 char *cp2;
276 void *ret;
277
278 t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
279 if (t1 >= s) {
280 ret = *dpos;
281 *dpos += s;
282 return ret;
283 }
284 cp2 = nfsm_disct(md, dpos, s, t1);
285 return cp2;
286 }
287
288 int
289 nfsm_strsiz_xx(int *s, int m, struct mbuf **mb, caddr_t *bpos)
290 {
291 u_int32_t *tl;
292
293 tl = nfsm_dissect_xx(NFSX_UNSIGNED, mb, bpos);
294 if (tl == NULL)
295 return EBADRPC;
296 *s = fxdr_unsigned(int32_t, *tl);
297 if (*s > m)
298 return EBADRPC;
299 return 0;
300 }
301
302 int
303 nfsm_adv_xx(int s, struct mbuf **md, caddr_t *dpos)
304 {
305 int t1;
306
307 t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
308 if (t1 >= s) {
309 *dpos += s;
310 return 0;
311 }
312 t1 = nfs_adv(md, dpos, s, t1);
313 if (t1)
314 return t1;
315 return 0;
316 }
Cache object: 81e3c0d093e30979dd9ff2d5e30d2eda
|