1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 *
25 * Simple nfs ops - open, close, read, and lseek.
26 */
27
28 #pragma ident "%Z%%M% %I% %E% SMI"
29
30 #include <rpc/types.h>
31 #include <rpc/auth.h>
32 #include <sys/t_lock.h>
33 #include "clnt.h"
34 #include <sys/fcntl.h>
35 #include <sys/vfs.h>
36 #include <errno.h>
37 #include <sys/promif.h>
38 #include <rpc/xdr.h>
39 #include "nfs_inet.h"
40 #include <sys/stat.h>
41 #include <sys/bootvfs.h>
42 #include <sys/bootdebug.h>
43 #include <sys/salib.h>
44 #include <sys/sacache.h>
45 #include <rpc/rpc.h>
46 #include "brpc.h"
47 #include <rpcsvc/nfs_prot.h>
48 #include "socket_inet.h"
49 #include "mac.h"
50 #include <sys/mode.h>
51
52 ushort_t vttoif_tab[] = {
53 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFIFO,
54 S_IFDOOR, 0, S_IFSOCK, 0
55 };
56
57 static int file_desc = 1;
58 static struct nfs_files {
59 struct nfs_file file;
60 int desc;
61 struct nfs_files *next;
62 } nfs_files[1] = {
63 {0, 0, 0},
64 };
65
66 #define dprintf if (boothowto & RB_DEBUG) printf
67
68 static int boot_nfs_open(char *filename, int flags);
69 static int boot_nfs_close(int fd);
70 static ssize_t boot_nfs_read(int fd, caddr_t buf, size_t size);
71 static off_t boot_nfs_lseek(int, off_t, int);
72 static int boot_nfs_fstat(int fd, struct bootstat *stp);
73 static void boot_nfs_closeall(int flag);
74 static int boot_nfs_getdents(int fd, struct dirent *dep, unsigned size);
75
76 struct boot_fs_ops boot_nfs_ops = {
77 "nfs",
78 boot_nfs_mountroot,
79 boot_nfs_unmountroot,
80 boot_nfs_open,
81 boot_nfs_close,
82 boot_nfs_read,
83 boot_nfs_lseek,
84 boot_nfs_fstat,
85 boot_nfs_closeall,
86 boot_nfs_getdents
87 };
88
89 /*
90 * bootops.c calls a closeall() function to close all open files. Since
91 * we only permit one open file at a time (not counting the device), this
92 * is simple to implement.
93 */
94
95 /*ARGSUSED*/
96 static void
boot_nfs_closeall(int flag)97 boot_nfs_closeall(int flag)
98 {
99 struct nfs_files *filep;
100
101 #ifdef NFS_OPS_DEBUG
102 if ((boothowto & DBFLAGS) == DBFLAGS)
103 printf("boot_nfs_closeall(%x)\n", flag);
104 #endif
105
106 if (nfs_files->file.version == 0 &&
107 nfs_files->desc == 0 &&
108 nfs_files->next == NULL)
109 return;
110
111 /* delete any dynamically allocated entries */
112 while ((filep = nfs_files->next) != NULL) {
113 nfs_files->next = filep->next;
114 bkmem_free((caddr_t)filep, sizeof (struct nfs_files));
115 }
116
117 /* clear the first, static file */
118 bzero((caddr_t)nfs_files, sizeof (struct nfs_files));
119
120 /* Close device */
121 release_cache(mac_get_dev());
122
123 mac_fini();
124 }
125
126 /*
127 * Get a file pointer given a file descriptor. Return 0 on error
128 */
129 static struct nfs_files *
get_filep(int fd)130 get_filep(int fd)
131 {
132 struct nfs_files *filep;
133
134 for (filep = nfs_files; filep; filep = filep->next) {
135 if (fd == filep->desc)
136 return (filep);
137 }
138 return (NULL);
139 }
140
141 /*
142 * Unmount the root fs -- not supported for this fstype.
143 */
144
145 int
boot_nfs_unmountroot(void)146 boot_nfs_unmountroot(void)
147 {
148 return (-1);
149 }
150
151 /*
152 * open a file for reading. Note: writing is NOT supported.
153 */
154
155 static int
boot_nfs_open(char * path,int flags)156 boot_nfs_open(char *path, int flags)
157 {
158 struct nfs_files *filep, *newfilep;
159 int got_filep;
160
161 #ifdef NFS_OPS_DEBUG
162 if ((boothowto & DBFLAGS) == DBFLAGS)
163 printf("boot_nfs_open(%s, %x)\n", path, flags);
164 #endif
165
166 /* file can only be opened readonly. */
167 if (flags & ~O_RDONLY) {
168 dprintf("boot_nfs_open: files can only be opened O_RDONLY.\n");
169 return (-1);
170 }
171
172 if (path == NULL || *path == '\0') {
173 dprintf("boot_nfs_open: NULL or EMPTY pathname argument.\n");
174 return (-1);
175 }
176
177 /* Try and find a vacant file pointer */
178 filep = nfs_files;
179 got_filep = FALSE;
180 do {
181 if (filep->desc == 0) {
182 filep->desc = file_desc++;
183 got_filep = TRUE;
184 break; /* We've got a file pointer */
185 }
186 /* Get next entry if not at end of list */
187 if (filep->next)
188 filep = filep->next;
189 } while (filep->next);
190
191 /* If a a vacant file pointer cannot be found, make one */
192 if (!got_filep) {
193 if ((newfilep = (struct nfs_files *)
194 bkmem_zalloc(sizeof (struct nfs_files))) == 0) {
195 dprintf("open: Cannot allocate file pointer\n");
196 return (-1);
197 }
198 filep->next = newfilep;
199 filep = newfilep;
200 filep->desc = file_desc++;
201 }
202
203 if (lookup(path, &filep->file, FALSE) != 0) {
204 #ifdef NFS_OPS_DEBUG
205 if ((boothowto & DBFLAGS) == DBFLAGS)
206 printf("boot_nfs_open(): Cannot open '%s'.\n", path);
207 #endif
208 /* zero file pointer */
209 bzero((caddr_t)filep, sizeof (struct nfs_file));
210 filep->desc = 0;
211 return (-1);
212 }
213 bzero(&filep->file.cookie, sizeof (filep->file.cookie));
214
215 #ifdef NFS_OPS_DEBUG
216 if ((boothowto & DBFLAGS) == DBFLAGS)
217 printf("boot_nfs_open(): '%s' successful, fd = 0x%x\n",
218 path, filep->desc);
219 #endif
220 return (filep->desc);
221 }
222
223 /*
224 * close a previously opened file.
225 */
226 static int
boot_nfs_close(int fd)227 boot_nfs_close(int fd)
228 {
229 struct nfs_files *filep;
230
231 #ifdef NFS_OPS_DEBUG
232 if ((boothowto & DBFLAGS) == DBFLAGS)
233 printf("boot_nfs_close(%d)\n", fd);
234 #endif
235 if ((filep = get_filep(fd)) == 0)
236 return (0);
237
238 /*
239 * zero file pointer
240 */
241 bzero((caddr_t)&filep->file, sizeof (struct nfs_file));
242
243 /*
244 * "close" the fd.
245 */
246 filep->desc = 0;
247
248 return (0);
249 }
250
251 /*
252 * read from a file.
253 */
254 static ssize_t
boot_nfs_read(int fd,char * buf,size_t size)255 boot_nfs_read(int fd, char *buf, size_t size)
256 {
257 struct nfs_files *filep;
258 int count = 0;
259
260 if (fd == 0) {
261 dprintf("boot_nfs_read: Bad file number.\n");
262 return (-1);
263 }
264 if (buf == NULL) {
265 dprintf("boot_nfs_read: Bad address.\n");
266 return (-1);
267 }
268
269 #ifdef NFS_OPS_DEBUG
270 if ((boothowto & DBFLAGS) == DBFLAGS)
271 printf("boot_nfs_read(%d, %x, 0x%x)\n", fd, buf, size);
272 #endif
273
274 /* initialize for read */
275 if ((filep = get_filep(fd)) == 0)
276 return (-1);
277
278 switch (filep->file.version) {
279 case NFS_VERSION:
280 count = nfsread(&filep->file, buf, size);
281 break;
282 case NFS_V3:
283 count = nfs3read(&filep->file, buf, size);
284 break;
285 case NFS_V4:
286 count = nfs4read(&filep->file, buf, size);
287 break;
288 default:
289 printf("boot_nfs_read: NFS Version %d not supported\n",
290 filep->file.version);
291 count = -1;
292 break;
293 }
294
295 #ifdef NFS_OPS_DEBUG
296 if ((boothowto & DBFLAGS) == DBFLAGS)
297 printf("boot_nfs_read(): 0x%x bytes.\n", count);
298 #endif
299 return (count);
300 }
301
302 /*
303 * lseek - move read file pointer.
304 */
305
306 static off_t
boot_nfs_lseek(int fd,off_t offset,int whence)307 boot_nfs_lseek(int fd, off_t offset, int whence)
308 {
309 struct nfs_files *filep;
310
311 #ifdef NFS_OPS_DEBUG
312 if ((boothowto & DBFLAGS) == DBFLAGS)
313 printf("boot_nfs_lseek(%d, 0x%x, %d)\n", fd, offset, whence);
314 #endif
315
316 if (fd == 0) {
317 dprintf("boot_nfs_lseek: Bad file number.\n");
318 return (-1);
319 }
320
321 if ((filep = get_filep(fd)) == 0)
322 return (-1);
323
324 switch (whence) {
325
326 case SEEK_SET:
327 /*
328 * file ptr is set to offset from beginning of file
329 */
330 filep->file.offset = offset;
331 break;
332 case SEEK_CUR:
333 /*
334 * file ptr is set to offset from current position
335 */
336 filep->file.offset += offset;
337 break;
338 case SEEK_END:
339 /*
340 * file ptr is set to current size of file plus offset.
341 * But since we only support reading, this is illegal.
342 */
343 default:
344 /*
345 * invalid offset origin
346 */
347 dprintf("boot_nfs_lseek: invalid whence value.\n");
348 return (-1);
349 }
350
351 #ifdef notyet
352 return (filep->file.offset);
353 #else
354 /*
355 * BROKE - lseek should return the offset seeked to on a
356 * successful seek, not zero - This must be fixed in the
357 * kernel before It can be fixed here.
358 */
359 return (0);
360 #endif /* notyet */
361 }
362
363 /*
364 * This version of fstat supports mode, size, inode #, and times only.
365 * It can be enhanced if more is required,
366 */
367
368 static int
boot_nfs_fstat(int fd,struct bootstat * stp)369 boot_nfs_fstat(int fd, struct bootstat *stp)
370 {
371 struct vattr va;
372 struct nfs_files *filep;
373 int status;
374
375 #ifdef NFS_OPS_DEBUG
376 if ((boothowto & DBFLAGS) == DBFLAGS) {
377 printf("boot_nfs_fstat(%d, 0x%x)\n", fd, stp);
378 }
379 #endif
380 if (fd == 0) {
381 dprintf("boot_nfs_fstat(): Bad file number 0.\n");
382 return (-1);
383 }
384
385 if ((filep = get_filep(fd)) == 0)
386 return (-1);
387
388 bzero((char *)&va, sizeof (va));
389 va.va_mask = AT_TYPE | AT_SIZE | AT_MODE | AT_NODEID |
390 AT_ATIME | AT_CTIME | AT_MTIME;
391
392 switch (filep->file.version) {
393 case NFS_VERSION:
394 status = nfsgetattr(&filep->file, &va);
395 break;
396 case NFS_V3:
397 status = nfs3getattr(&filep->file, &va);
398 break;
399 case NFS_V4:
400 status = nfs4getattr(&filep->file, &va);
401 break;
402 default:
403 printf("boot_nfs_fstat: NFS Version %d not supported\n",
404 filep->file.version);
405 status = -1;
406 break;
407 }
408
409 if (status != 0)
410 return (-1);
411
412 if (va.va_size > (u_offset_t)MAXOFF_T) {
413 dprintf("boot_nfs_fstat(): File too large.\n");
414 return (-1);
415 }
416 stp->st_size = (off_t)va.va_size;
417 stp->st_mode = VTTOIF(va.va_type) | va.va_mode;
418 stp->st_atim.tv_sec = va.va_atime.tv_sec;
419 stp->st_atim.tv_nsec = va.va_atime.tv_nsec;
420 stp->st_ctim.tv_sec = va.va_ctime.tv_sec;
421 stp->st_ctim.tv_nsec = va.va_ctime.tv_nsec;
422 stp->st_mtim.tv_sec = va.va_mtime.tv_sec;
423 stp->st_mtim.tv_nsec = va.va_mtime.tv_nsec;
424 stp->st_ino = (ino_t)va.va_nodeid;
425
426 #ifdef NFS_OPS_DEBUG
427 if ((boothowto & DBFLAGS) == DBFLAGS)
428 printf("boot_nfs_fstat(): done.\n");
429 #endif
430 return (0);
431 }
432
433 static int
boot_nfs_getdents(int fd,struct dirent * dep,unsigned size)434 boot_nfs_getdents(int fd, struct dirent *dep, unsigned size)
435 {
436 struct nfs_files *filep;
437 int status;
438
439 #ifdef NFS_OPS_DEBUG
440 if ((boothowto & DBFLAGS) == DBFLAGS) {
441 printf("boot_nfs_getdents(%d, 0x%x, 0x%x)\n", fd, dep, size);
442 }
443 #endif
444
445 if (fd == 0) {
446 dprintf("boot_nfs_getdents(): Bad file number 0.\n");
447 return (-1);
448 }
449
450 if ((filep = get_filep(fd)) == 0)
451 return (-1);
452
453 switch (filep->file.version) {
454 case NFS_VERSION:
455 status = nfsgetdents(&filep->file, dep, size);
456 break;
457 case NFS_V3:
458 status = nfs3getdents(&filep->file, dep, size);
459 break;
460 default:
461 printf("boot_nfs_getdents: NFS Version %d not supported\n",
462 filep->file.version);
463 status = -1;
464 }
465
466 #ifdef NFS_OPS_DEBUG
467 if ((boothowto & DBFLAGS) == DBFLAGS)
468 printf("boot_nfs_getdents(): done.\n");
469 #endif
470 return (status);
471 }
472