proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / nwfs / nwfs_subr.c
CommitLineData
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1/*
2 * Copyright (c) 1999, Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: src/sys/nwfs/nwfs_subr.c,v 1.2.2.2 2000/10/25 02:11:10 bp Exp $
dadab5e9 33 * $DragonFly: src/sys/vfs/nwfs/nwfs_subr.c,v 1.3 2003/06/25 03:56:08 dillon Exp $
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34 */
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/malloc.h>
39#include <machine/clock.h>
40#include <sys/time.h>
41
42#include <netncp/ncp.h>
43#include <netncp/ncp_conn.h>
44#include <netncp/ncp_ncp.h>
45#include <netncp/ncp_subr.h>
46#include <netncp/ncp_rq.h>
47#include <netncp/nwerror.h>
48
49#include <nwfs/nwfs.h>
50#include <nwfs/nwfs_node.h>
51#include <nwfs/nwfs_subr.h>
52
53MALLOC_DEFINE(M_NWFSDATA, "NWFS data", "NWFS private data");
54
55static void
56ncp_extract_file_info(struct nwmount *nmp, struct ncp_rq *rqp, struct nw_entry_info *target) {
57 u_char name_len;
58 const int info_struct_size = sizeof(struct nw_entry_info) - 257;
59
60 ncp_rp_mem(rqp,(caddr_t)target,info_struct_size);
61 name_len = ncp_rp_byte(rqp);
62 target->nameLen = name_len;
63 ncp_rp_mem(rqp,(caddr_t)target->entryName, name_len);
64 target->entryName[name_len] = '\0';
65 ncp_path2unix(target->entryName, target->entryName, name_len, &nmp->m.nls);
66 return;
67}
68
69static void
70ncp_update_file_info(struct nwmount *nmp, struct ncp_rq *rqp,
71 struct nw_entry_info *target)
72{
73 int info_struct_size = sizeof(struct nw_entry_info) - 257;
74
75 ncp_rp_mem(rqp,(caddr_t)target,info_struct_size);
76 return;
77}
78
79int
dadab5e9 80ncp_initsearch(struct vnode *dvp,struct thread *td,struct ucred *cred)
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81{
82 struct nwmount *nmp = VTONWFS(dvp);
83 struct ncp_conn *conn = NWFSTOCONN(nmp);
84 struct nwnode *np = VTONW(dvp);
85 u_int8_t volnum = nmp->n_volume;
86 u_int32_t dirent = np->n_fid.f_id;
87 int error;
88 DECLARE_RQ;
89
90 NCPNDEBUG("vol=%d,dir=%d\n", volnum, dirent);
dadab5e9 91 NCP_RQ_HEAD(87,td,cred);
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92 ncp_rq_byte(rqp, 2); /* subfunction */
93 ncp_rq_byte(rqp, nmp->name_space);
94 ncp_rq_byte(rqp, 0); /* reserved */
95 ncp_rq_dbase_path(rqp, volnum, dirent, 0, NULL, NULL);
96 checkbad(ncp_request(conn,rqp));
97 ncp_rp_mem(rqp,(caddr_t)&np->n_seq, sizeof(np->n_seq));
98 NCP_RQ_EXIT;
99 return error;
100}
101
102int
103ncp_search_for_file_or_subdir(struct nwmount *nmp,
104 struct nw_search_seq *seq,
105 struct nw_entry_info *target,
dadab5e9 106 struct thread *td,struct ucred *cred)
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107{
108 struct ncp_conn *conn = NWFSTOCONN(nmp);
109 int error;
110 DECLARE_RQ;
111
dadab5e9 112 NCP_RQ_HEAD(87,td,cred);
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113 ncp_rq_byte(rqp, 3); /* subfunction */
114 ncp_rq_byte(rqp, nmp->name_space);
115 ncp_rq_byte(rqp, 0); /* data stream */
116 ncp_rq_word_lh(rqp, 0xffff); /* Search attribs */
117 ncp_rq_dword(rqp, IM_ALL); /* return info mask */
118 ncp_rq_mem(rqp, (caddr_t)seq, 9);
119 ncp_rq_byte(rqp, 2); /* 2 byte pattern */
120 ncp_rq_byte(rqp, 0xff); /* following is a wildcard */
121 ncp_rq_byte(rqp, '*');
122 checkbad(ncp_request(conn,rqp));
123 ncp_rp_mem(rqp,(caddr_t)seq, sizeof(*seq));
124 ncp_rp_byte(rqp); /* skip */
125 ncp_extract_file_info(nmp, rqp, target);
126 NCP_RQ_EXIT;
127 return error;
128}
129
130/*
131 * Returns information for a (one-component) name relative to the specified
132 * directory.
133 */
134int
135ncp_obtain_info(struct nwmount *nmp, u_int32_t dirent,
136 int namelen, char *path, struct nw_entry_info *target,
dadab5e9 137 struct thread *td,struct ucred *cred)
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138{
139 struct ncp_conn *conn=NWFSTOCONN(nmp);
140 int error;
141 u_char volnum = nmp->n_volume, ns;
142 DECLARE_RQ;
143
144 if (target == NULL) {
145 NCPFATAL("target == NULL\n");
146 return EINVAL;
147 }
148 ns = (path == NULL || path[0] == 0) ? NW_NS_DOS : nmp->name_space;
dadab5e9 149 NCP_RQ_HEAD(87, td, cred);
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150 ncp_rq_byte(rqp, 6); /* subfunction */
151 ncp_rq_byte(rqp, ns);
152 ncp_rq_byte(rqp, ns); /* DestNameSpace */
153 ncp_rq_word(rqp, htons(0xff00)); /* get all */
154 ncp_rq_dword(rqp, IM_ALL);
155 ncp_rq_dbase_path(rqp, volnum, dirent, namelen, path, &nmp->m.nls);
156 checkbad(ncp_request(conn,rqp));
157 if (path)
158 ncp_extract_file_info(nmp, rqp, target);
159 else
160 ncp_update_file_info(nmp, rqp, target);
161 NCP_RQ_EXIT;
162 return error;
163}
164/*
165 * lookup name pointed by cnp in directory dvp and return file info in np.
166 * May be I should create a little cache, but another way is to minimize
167 * number of calls, on other hand, in multiprocess environment ...
168 */
169int
170ncp_lookup(struct vnode *dvp, int len, char *name, struct nw_entry_info *fap,
dadab5e9 171 struct thread *td,struct ucred *cred)
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172{
173 struct nwmount *nmp;
174 struct nwnode *dnp = VTONW(dvp);
175 struct ncp_conn *conn;
176 int error;
177
178 if (!dvp || dvp->v_type != VDIR) {
179 nwfs_printf("dvp is NULL or not a directory.\n");
180 return (ENOENT);
181 }
182 nmp = VTONWFS(dvp);
183 conn = NWFSTOCONN(nmp);
184
185 if (len == 1 && name[0] == '.') {
186 if (strcmp(dnp->n_name, NWFS_ROOTVOL) == 0) {
187 error = ncp_obtain_info(nmp, dnp->n_fid.f_id, 0, NULL,
dadab5e9 188 fap, td, cred);
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189 } else {
190 error = ncp_obtain_info(nmp, dnp->n_fid.f_parent,
dadab5e9 191 dnp->n_nmlen, dnp->n_name, fap, td, cred);
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192 }
193 return error;
194 } else if (len == 2 && name[0] == '.' && name[1] == '.') {
195 printf("%s: knows NOTHING about '..'\n", __FUNCTION__);
196 return EIO;
197 } else {
198 error = ncp_obtain_info(nmp, dnp->n_fid.f_id,
dadab5e9 199 len, name, fap, td, cred);
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200 }
201 return error;
202}
203
204static void ConvertToNWfromDWORD(u_int32_t sfd, ncp_fh *fh);
205static void
206ConvertToNWfromDWORD(u_int32_t sfd, ncp_fh *fh) {
207 fh->val1 = (fh->val.val32 = sfd);
208 return;
209}
210
211/*
212 * If both dir and name are NULL, then in target there's already a looked-up
213 * entry that wants to be opened.
214 */
215int
216ncp_open_create_file_or_subdir(struct nwmount *nmp,struct vnode *dvp,int namelen,
217 char *name, int open_create_mode, u_int32_t create_attributes,
218 int desired_acc_rights, struct ncp_open_info *nop,
dadab5e9 219 struct thread *td,struct ucred *cred)
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220{
221
222 struct ncp_conn *conn=NWFSTOCONN(nmp);
223 u_int16_t search_attribs = SA_ALL & (~SA_SUBDIR_FILES);
224 u_int8_t volnum;
225 u_int32_t dirent;
226 int error;
227 DECLARE_RQ;
228
229 volnum = nmp->n_volume;
230 dirent = VTONW(dvp)->n_fid.f_id;
231 if ((create_attributes & aDIR) != 0) {
232 search_attribs |= SA_SUBDIR_FILES;
233 }
dadab5e9 234 NCP_RQ_HEAD(87,td,cred);
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235 ncp_rq_byte(rqp, 1);/* subfunction */
236 ncp_rq_byte(rqp, nmp->name_space);
237 ncp_rq_byte(rqp, open_create_mode);
238 ncp_rq_word(rqp, search_attribs);
239 ncp_rq_dword(rqp, IM_ALL);
240 ncp_rq_dword(rqp, create_attributes);
241 /*
242 * The desired acc rights seem to be the inherited rights mask for
243 * directories
244 */
245 ncp_rq_word(rqp, desired_acc_rights);
246 ncp_rq_dbase_path(rqp, volnum, dirent, namelen, name, &nmp->m.nls);
247 checkbad(ncp_request(conn,rqp));
248
249 nop->origfh = ncp_rp_dword_lh(rqp);
250 nop->action = ncp_rp_byte(rqp);
251 ncp_rp_byte(rqp); /* skip */
252 ncp_extract_file_info(nmp, rqp, &nop->fattr);
253 ConvertToNWfromDWORD(nop->origfh, &nop->fh);
254 NCP_RQ_EXIT;
255 switch(error) {
256 case NWE_FILE_NO_CREATE_PRIV:
257 error = EACCES;
258 break;
259 }
260 return error;
261}
262
263int
dadab5e9 264ncp_close_file(struct ncp_conn *conn, ncp_fh *fh,struct thread *td,struct ucred *cred) {
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265 int error;
266 DECLARE_RQ;
267
dadab5e9 268 NCP_RQ_HEAD(66,td,cred);
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269 ncp_rq_byte(rqp, 0);
270 ncp_rq_mem(rqp, (caddr_t)fh, 6);
271 error = ncp_request(conn,rqp);
272 NCP_RQ_EXIT_NB;
273 return error;
274}
275
276int
277ncp_DeleteNSEntry(struct nwmount *nmp, u_int32_t dirent,
dadab5e9 278 int namelen,char *name,struct thread *td,struct ucred *cred)
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279{
280 int error;
281 struct ncp_conn *conn=NWFSTOCONN(nmp);
282 DECLARE_RQ;
283
dadab5e9 284 NCP_RQ_HEAD(87,td,cred);
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285 ncp_rq_byte(rqp, 8); /* subfunction */
286 ncp_rq_byte(rqp, nmp->name_space);
287 ncp_rq_byte(rqp, 0); /* reserved */
288 ncp_rq_word(rqp, SA_ALL); /* search attribs: all */
289 ncp_rq_dbase_path(rqp, nmp->n_volume, dirent, namelen, name, &nmp->m.nls);
290 error = ncp_request(conn,rqp);
291 NCP_RQ_EXIT_NB;
292 return error;
293}
294
295int
296ncp_nsrename(struct ncp_conn *conn, int volume, int ns, int oldtype,
297 struct ncp_nlstables *nt,
298 nwdirent fdir, char *old_name, int oldlen,
299 nwdirent tdir, char *new_name, int newlen,
dadab5e9 300 struct thread *td, struct ucred *cred)
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301{
302 DECLARE_RQ;
303 int error;
304
dadab5e9 305 NCP_RQ_HEAD(87,td,cred);
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306 ncp_rq_byte(rqp, 4);
307 ncp_rq_byte(rqp, ns);
308 ncp_rq_byte(rqp, 1);
309 ncp_rq_word(rqp, oldtype);
310 /* source Handle Path */
311 ncp_rq_byte(rqp, volume);
312 ncp_rq_dword(rqp, fdir);
313 ncp_rq_byte(rqp, 1);
314 ncp_rq_byte(rqp, 1); /* 1 source component */
315 /* dest Handle Path */
316 ncp_rq_byte(rqp, volume);
317 ncp_rq_dword(rqp, tdir);
318 ncp_rq_byte(rqp, 1);
319 ncp_rq_byte(rqp, 1); /* 1 destination component */
320 ncp_rq_pathstring(rqp, oldlen, old_name, nt);
321 ncp_rq_pathstring(rqp, newlen, new_name, nt);
322 error = ncp_request(conn,rqp);
323 NCP_RQ_EXIT_NB;
324 return error;
325}
326
327int
328ncp_modify_file_or_subdir_dos_info(struct nwmount *nmp, struct vnode *vp,
329 u_int32_t info_mask,
330 struct nw_modify_dos_info *info,
dadab5e9 331 struct thread *td,struct ucred *cred)
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332{
333 struct nwnode *np=VTONW(vp);
334 u_int8_t volnum = nmp->n_volume;
335 u_int32_t dirent = np->n_fid.f_id;
336 struct ncp_conn *conn=NWFSTOCONN(nmp);
337 int error;
338 DECLARE_RQ;
339
dadab5e9 340 NCP_RQ_HEAD(87,td,cred);
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341 ncp_rq_byte(rqp, 7); /* subfunction */
342 ncp_rq_byte(rqp, nmp->name_space);
343 ncp_rq_byte(rqp, 0); /* reserved */
344 ncp_rq_word(rqp, htons(0x0680)); /* search attribs: all */
345 ncp_rq_dword(rqp, info_mask);
346 ncp_rq_mem(rqp, (caddr_t)info, sizeof(*info));
347 ncp_rq_dbase_path(rqp, volnum, dirent, 0, NULL, NULL);
348 error = ncp_request(conn,rqp);
349 NCP_RQ_EXIT_NB;
350 return error;
351}
352
353int
dadab5e9 354ncp_setattr(vp, vap, cred, td)
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355 struct vnode *vp;
356 struct vattr *vap;
357 struct ucred *cred;
dadab5e9 358 struct thread *td;
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359{
360 struct nwmount *nmp=VTONWFS(vp);
361 struct nwnode *np=VTONW(vp);
362 struct ncp_open_info nwn;
363 struct ncp_conn *conn=NWFSTOCONN(nmp);
364 struct nw_modify_dos_info info;
365 int error = 0, info_mask;
366 DECLARE_RQ;
367
368 if (vap->va_size != VNOVAL) {
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369 error = ncp_open_create_file_or_subdir(
370 nmp, vp, 0, NULL, OC_MODE_OPEN, 0,
371 AR_WRITE | AR_READ, &nwn,td,cred);
984263bc 372 if (error) return error;
dadab5e9 373 NCP_RQ_HEAD(73,td,cred);
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374 ncp_rq_byte(rqp, 0);
375 ncp_rq_mem(rqp, (caddr_t)&nwn.fh, 6);
376 ncp_rq_dword(rqp, htonl(vap->va_size));
377 ncp_rq_word_hl(rqp, 0);
378 checkbad(ncp_request(conn,rqp));
379 np->n_vattr.va_size = np->n_size = vap->va_size;
380 NCP_RQ_EXIT;
dadab5e9 381 ncp_close_file(conn, &nwn.fh, td, cred);
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382 if (error) return error;
383 }
384 info_mask = 0;
385 bzero(&info, sizeof(info));
386
387 if (vap->va_mtime.tv_sec != VNOVAL) {
388 info_mask |= (DM_MODIFY_TIME | DM_MODIFY_DATE);
389 ncp_unix2dostime(&vap->va_mtime, nmp->m.tz, &info.modifyDate, &info.modifyTime, NULL);
390 }
391 if (vap->va_atime.tv_sec != VNOVAL) {
392 info_mask |= (DM_LAST_ACCESS_DATE);
393 ncp_unix2dostime(&vap->va_atime, nmp->m.tz, &info.lastAccessDate, NULL, NULL);
394 }
395 if (info_mask) {
dadab5e9 396 error = ncp_modify_file_or_subdir_dos_info(nmp, vp, info_mask, &info,td,cred);
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397 }
398 return (error);
399}
400
401int
402ncp_get_volume_info_with_number(struct ncp_conn *conn,
403 int n, struct ncp_volume_info *target,
dadab5e9 404 struct thread *td,struct ucred *cred) {
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405 int error,len;
406 DECLARE_RQ;
407
dadab5e9 408 NCP_RQ_HEAD_S(22,44,td,cred);
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409 ncp_rq_byte(rqp,n);
410 checkbad(ncp_request(conn,rqp));
411 target->total_blocks = ncp_rp_dword_lh(rqp);
412 target->free_blocks = ncp_rp_dword_lh(rqp);
413 target->purgeable_blocks = ncp_rp_dword_lh(rqp);
414 target->not_yet_purgeable_blocks = ncp_rp_dword_lh(rqp);
415 target->total_dir_entries = ncp_rp_dword_lh(rqp);
416 target->available_dir_entries = ncp_rp_dword_lh(rqp);
417 ncp_rp_dword_lh(rqp);
418 target->sectors_per_block = ncp_rp_byte(rqp);
419 bzero(&target->volume_name, sizeof(target->volume_name));
420 len = ncp_rp_byte(rqp);
421 if (len > NCP_VOLNAME_LEN) {
422 error = ENAMETOOLONG;
423 } else {
424 ncp_rp_mem(rqp,(caddr_t)&target->volume_name, len);
425 }
426 NCP_RQ_EXIT;
427 return error;
428}
429
430int
431ncp_get_namespaces(struct ncp_conn *conn, u_int32_t volume, int *nsf,
dadab5e9 432 struct thread *td,struct ucred *cred) {
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433 int error;
434 u_int8_t ns;
435 u_int16_t nscnt;
436 DECLARE_RQ;
437
dadab5e9 438 NCP_RQ_HEAD(87,td,cred);
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439 ncp_rq_byte(rqp, 24); /* Subfunction: Get Loaded Name Spaces */
440 ncp_rq_word(rqp, 0);
441 ncp_rq_byte(rqp, volume);
442 checkbad(ncp_request(conn,rqp));
443 nscnt = ncp_rp_word_lh(rqp);
444 *nsf = 0;
445 while (nscnt-- > 0) {
446 ns = ncp_rp_byte(rqp);
447 *nsf |= 1 << ns;
448 }
449 NCP_RQ_EXIT;
450 return error;
451}
452
453int
454ncp_lookup_volume(struct ncp_conn *conn, char *volname,
455 u_char *volNum, u_int32_t *dirEnt,
dadab5e9 456 struct thread *td,struct ucred *cred)
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457{
458 int error;
459 DECLARE_RQ;
460
461 NCPNDEBUG("looking up vol %s\n", volname);
dadab5e9 462 NCP_RQ_HEAD(87,td,cred);
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463 ncp_rq_byte(rqp, 22); /* Subfunction: Generate dir handle */
464 ncp_rq_byte(rqp, 0); /* src name space */
465 ncp_rq_byte(rqp, 0); /* dst name space, always zero */
466 ncp_rq_word(rqp, 0); /* dstNSIndicator */
467
468 ncp_rq_byte(rqp, 0); /* faked volume number */
469 ncp_rq_dword(rqp, 0); /* faked dir_base */
470 ncp_rq_byte(rqp, 0xff); /* Don't have a dir_base */
471 ncp_rq_byte(rqp, 1); /* 1 path component */
472 ncp_rq_pstring(rqp, volname);
473 checkbad(ncp_request(conn,rqp));
474 ncp_rp_dword_lh(rqp); /* NSDirectoryBase*/
475 *dirEnt = ncp_rp_dword_lh(rqp);
476 *volNum = ncp_rp_byte(rqp);
477 NCP_RQ_EXIT;
478 return error;
479}
480
481/*
482 * Time & date conversion routines taken from msdosfs. Although leap
483 * year calculation is bogus, it's sufficient before 2100 :)
484 */
485/*
486 * This is the format of the contents of the deTime field in the direntry
487 * structure.
488 * We don't use bitfields because we don't know how compilers for
489 * arbitrary machines will lay them out.
490 */
491#define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */
492#define DT_2SECONDS_SHIFT 0
493#define DT_MINUTES_MASK 0x7E0 /* minutes */
494#define DT_MINUTES_SHIFT 5
495#define DT_HOURS_MASK 0xF800 /* hours */
496#define DT_HOURS_SHIFT 11
497
498/*
499 * This is the format of the contents of the deDate field in the direntry
500 * structure.
501 */
502#define DD_DAY_MASK 0x1F /* day of month */
503#define DD_DAY_SHIFT 0
504#define DD_MONTH_MASK 0x1E0 /* month */
505#define DD_MONTH_SHIFT 5
506#define DD_YEAR_MASK 0xFE00 /* year - 1980 */
507#define DD_YEAR_SHIFT 9
508/*
509 * Total number of days that have passed for each month in a regular year.
510 */
511static u_short regyear[] = {
512 31, 59, 90, 120, 151, 181,
513 212, 243, 273, 304, 334, 365
514};
515
516/*
517 * Total number of days that have passed for each month in a leap year.
518 */
519static u_short leapyear[] = {
520 31, 60, 91, 121, 152, 182,
521 213, 244, 274, 305, 335, 366
522};
523
524/*
525 * Variables used to remember parts of the last time conversion. Maybe we
526 * can avoid a full conversion.
527 */
528static u_long lasttime;
529static u_long lastday;
530static u_short lastddate;
531static u_short lastdtime;
532/*
533 * Convert the unix version of time to dos's idea of time to be used in
534 * file timestamps. The passed in unix time is assumed to be in GMT.
535 */
536void
537ncp_unix2dostime(tsp, tzoff, ddp, dtp, dhp)
538 struct timespec *tsp;
539 int tzoff;
540 u_int16_t *ddp;
541 u_int16_t *dtp;
542 u_int8_t *dhp;
543{
544 u_long t;
545 u_long days;
546 u_long inc;
547 u_long year;
548 u_long month;
549 u_short *months;
550
551 /*
552 * If the time from the last conversion is the same as now, then
553 * skip the computations and use the saved result.
554 */
555 t = tsp->tv_sec - tzoff * 60 - tz.tz_minuteswest * 60 -
556 (wall_cmos_clock ? adjkerntz : 0);
557 t &= ~1;
558 if (lasttime != t) {
559 lasttime = t;
560 lastdtime = (((t / 2) % 30) << DT_2SECONDS_SHIFT)
561 + (((t / 60) % 60) << DT_MINUTES_SHIFT)
562 + (((t / 3600) % 24) << DT_HOURS_SHIFT);
563
564 /*
565 * If the number of days since 1970 is the same as the last
566 * time we did the computation then skip all this leap year
567 * and month stuff.
568 */
569 days = t / (24 * 60 * 60);
570 if (days != lastday) {
571 lastday = days;
572 for (year = 1970;; year++) {
573 inc = year & 0x03 ? 365 : 366;
574 if (days < inc)
575 break;
576 days -= inc;
577 }
578 months = year & 0x03 ? regyear : leapyear;
579 for (month = 0; days >= months[month]; month++)
580 ;
581 if (month > 0)
582 days -= months[month - 1];
583 lastddate = ((days + 1) << DD_DAY_SHIFT)
584 + ((month + 1) << DD_MONTH_SHIFT);
585 /*
586 * Remember dos's idea of time is relative to 1980.
587 * unix's is relative to 1970. If somehow we get a
588 * time before 1980 then don't give totally crazy
589 * results.
590 */
591 if (year > 1980)
592 lastddate += (year - 1980) << DD_YEAR_SHIFT;
593 }
594 }
595 if (dtp)
596 *dtp = lastdtime;
597 if (dhp)
598 *dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
599
600 *ddp = lastddate;
601}
602
603/*
604 * The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
605 * interval there were 8 regular years and 2 leap years.
606 */
607#define SECONDSTO1980 (((8 * 365) + (2 * 366)) * (24 * 60 * 60))
608
609static u_short lastdosdate;
610static u_long lastseconds;
611
612/*
613 * Convert from dos' idea of time to unix'. This will probably only be
614 * called from the stat(), and fstat() system calls and so probably need
615 * not be too efficient.
616 */
617void
618ncp_dos2unixtime(dd, dt, dh, tzoff, tsp)
619 u_int dd;
620 u_int dt;
621 u_int dh;
622 int tzoff;
623 struct timespec *tsp;
624{
625 u_long seconds;
626 u_long month;
627 u_long year;
628 u_long days;
629 u_short *months;
630
631 if (dd == 0) {
632 /*
633 * Uninitialized field, return the epoch.
634 */
635 tsp->tv_sec = 0;
636 tsp->tv_nsec = 0;
637 return;
638 }
639 seconds = (((dt & DT_2SECONDS_MASK) >> DT_2SECONDS_SHIFT) << 1)
640 + ((dt & DT_MINUTES_MASK) >> DT_MINUTES_SHIFT) * 60
641 + ((dt & DT_HOURS_MASK) >> DT_HOURS_SHIFT) * 3600
642 + dh / 100;
643 /*
644 * If the year, month, and day from the last conversion are the
645 * same then use the saved value.
646 */
647 if (lastdosdate != dd) {
648 lastdosdate = dd;
649 days = 0;
650 year = (dd & DD_YEAR_MASK) >> DD_YEAR_SHIFT;
651 days = year * 365;
652 days += year / 4 + 1; /* add in leap days */
653 if ((year & 0x03) == 0)
654 days--; /* if year is a leap year */
655 months = year & 0x03 ? regyear : leapyear;
656 month = (dd & DD_MONTH_MASK) >> DD_MONTH_SHIFT;
657 if (month < 1 || month > 12) {
658 month = 1;
659 }
660 if (month > 1)
661 days += months[month - 2];
662 days += ((dd & DD_DAY_MASK) >> DD_DAY_SHIFT) - 1;
663 lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
664 }
665 tsp->tv_sec = seconds + lastseconds + tz.tz_minuteswest * 60 +
666 tzoff * 60 + (wall_cmos_clock ? adjkerntz : 0);
667 tsp->tv_nsec = (dh % 100) * 10000000;
668}