1 /* $NetBSD: filecore_vnops.c,v 1.50 2022/03/27 17:10:55 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1994 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * filecore_vnops.c 1.2 1998/8/18
32 */
33
34 /*-
35 * Copyright (c) 1998 Andrew McMurry
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * filecore_vnops.c 1.2 1998/8/18
66 */
67
68 #include <sys/cdefs.h>
69 __KERNEL_RCSID(0, "$NetBSD: filecore_vnops.c,v 1.50 2022/03/27 17:10:55 christos Exp $");
70
71 #include <sys/param.h>
72 #include <sys/systm.h>
73 #include <sys/namei.h>
74 #include <sys/resourcevar.h>
75 #include <sys/kernel.h>
76 #include <sys/file.h>
77 #include <sys/stat.h>
78 #include <sys/buf.h>
79 #include <sys/proc.h>
80 #include <sys/conf.h>
81 #include <sys/mount.h>
82 #include <sys/vnode.h>
83 #include <sys/malloc.h>
84 #include <sys/dirent.h>
85 #include <sys/kauth.h>
86
87 #include <miscfs/genfs/genfs.h>
88 #include <miscfs/specfs/specdev.h>
89
90 #include <fs/filecorefs/filecore.h>
91 #include <fs/filecorefs/filecore_extern.h>
92 #include <fs/filecorefs/filecore_node.h>
93
94 static int
filecore_check_possible(struct vnode * vp,struct filecore_node * ip,mode_t mode)95 filecore_check_possible(struct vnode *vp, struct filecore_node *ip,
96 mode_t mode)
97 {
98
99 /*
100 * Disallow write attempts unless the file is a socket,
101 * fifo, or a block or character device resident on the
102 * file system.
103 */
104 if (mode & VWRITE) {
105 switch (vp->v_type) {
106 case VDIR:
107 case VLNK:
108 case VREG:
109 return (EROFS);
110 default:
111 break;
112 }
113 }
114
115 return 0;
116 }
117
118 /*
119 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
120 * The mode is shifted to select the owner/group/other fields. The
121 * super user is granted all permissions.
122 */
123 static int
filecore_check_permitted(struct vnode * vp,struct filecore_node * ip,accmode_t accmode,kauth_cred_t cred)124 filecore_check_permitted(struct vnode *vp, struct filecore_node *ip,
125 accmode_t accmode, kauth_cred_t cred)
126 {
127 struct filecore_mnt *fcmp = ip->i_mnt;
128
129 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(accmode,
130 vp->v_type, filecore_mode(ip)), vp, NULL,
131 genfs_can_access(vp, cred, fcmp->fc_uid, fcmp->fc_gid,
132 filecore_mode(ip), NULL, accmode));
133 }
134
135 int
filecore_access(void * v)136 filecore_access(void *v)
137 {
138 struct vop_access_args /* {
139 struct vnode *a_vp;
140 accmode_t a_accmode;
141 kauth_cred_t a_cred;
142 } */ *ap = v;
143 struct vnode *vp = ap->a_vp;
144 struct filecore_node *ip = VTOI(vp);
145 int error;
146
147 error = filecore_check_possible(vp, ip, ap->a_accmode);
148 if (error)
149 return error;
150
151 error = filecore_check_permitted(vp, ip, ap->a_accmode, ap->a_cred);
152
153 return error;
154 }
155
156 int
filecore_getattr(void * v)157 filecore_getattr(void *v)
158 {
159 struct vop_getattr_args /* {
160 struct vnode *a_vp;
161 struct vattr *a_vap;
162 kauth_cred_t a_cred;
163 } */ *ap = v;
164 struct vnode *vp = ap->a_vp;
165 struct filecore_node *ip = VTOI(vp);
166 struct vattr *vap = ap->a_vap;
167 struct filecore_mnt *fcmp = ip->i_mnt;
168
169 vap->va_fsid = ip->i_dev;
170 vap->va_fileid = ip->i_number;
171
172 vap->va_mode = filecore_mode(ip);
173 vap->va_nlink = 1;
174 vap->va_uid = fcmp->fc_uid;
175 vap->va_gid = fcmp->fc_gid;
176 vap->va_atime = filecore_time(ip);
177 vap->va_mtime = filecore_time(ip);
178 vap->va_ctime = filecore_time(ip);
179 vap->va_rdev = 0; /* We don't support specials */
180
181 vap->va_size = (u_quad_t) ip->i_size;
182 vap->va_flags = 0;
183 vap->va_gen = 1;
184 vap->va_blocksize = fcmp->blksize;
185 vap->va_bytes = vap->va_size;
186 vap->va_type = vp->v_type;
187 return (0);
188 }
189
190 /*
191 * Vnode op for reading.
192 */
193 int
filecore_read(void * v)194 filecore_read(void *v)
195 {
196 struct vop_read_args /* {
197 struct vnode *a_vp;
198 struct uio *a_uio;
199 int a_ioflag;
200 kauth_cred_t a_cred;
201 } */ *ap = v;
202 struct vnode *vp = ap->a_vp;
203 struct uio *uio = ap->a_uio;
204 struct filecore_node *ip = VTOI(vp);
205 struct filecore_mnt *fcmp;
206 struct buf *bp;
207 daddr_t lbn;
208 off_t diff;
209 int error = 0;
210 long size, n, on;
211
212 if (uio->uio_resid == 0)
213 return (0);
214 if (uio->uio_offset < 0)
215 return (EINVAL);
216 if (uio->uio_offset >= ip->i_size)
217 return (0);
218 ip->i_flag |= IN_ACCESS;
219 fcmp = ip->i_mnt;
220
221 if (vp->v_type == VREG) {
222 const int advice = IO_ADV_DECODE(ap->a_ioflag);
223 error = 0;
224
225 while (uio->uio_resid > 0) {
226 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset,
227 uio->uio_resid);
228
229 if (bytelen == 0) {
230 break;
231 }
232 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
233 UBC_READ | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp));
234 if (error) {
235 break;
236 }
237 }
238 goto out;
239 }
240
241 do {
242 lbn = filecore_lblkno(fcmp, uio->uio_offset);
243 on = filecore_blkoff(fcmp, uio->uio_offset);
244 n = MIN(filecore_blksize(fcmp, ip, lbn) - on, uio->uio_resid);
245 diff = (off_t)ip->i_size - uio->uio_offset;
246 if (diff <= 0)
247 return (0);
248 if (diff < n)
249 n = diff;
250 size = filecore_blksize(fcmp, ip, lbn);
251 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) {
252 error = filecore_dbread(ip, &bp);
253 on = uio->uio_offset;
254 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid);
255 size = FILECORE_DIR_SIZE;
256 } else {
257 error = bread(vp, lbn, size, 0, &bp);
258 #ifdef FILECORE_DEBUG_BR
259 printf("bread(%p, %llx, %ld, CRED, %p)=%d\n",
260 vp, (long long)lbn, size, bp, error);
261 #endif
262 }
263 if (error) {
264 return (error);
265 }
266 n = MIN(n, size - bp->b_resid);
267
268 error = uiomove((char *)(bp->b_data) + on, (int)n, uio);
269 #ifdef FILECORE_DEBUG_BR
270 printf("brelse(%p) vn2\n", bp);
271 #endif
272 brelse(bp, 0);
273 } while (error == 0 && uio->uio_resid > 0 && n != 0);
274
275 out:
276 return (error);
277 }
278
279 /*
280 * Vnode op for readdir
281 */
282 int
filecore_readdir(void * v)283 filecore_readdir(void *v)
284 {
285 struct vop_readdir_args /* {
286 struct vnode *a_vp;
287 struct uio *a_uio;
288 kauth_cred_t a_cred;
289 int *a_eofflag;
290 off_t **a_cookies;
291 int *a_ncookies;
292 } */ *ap = v;
293 struct uio *uio = ap->a_uio;
294 struct vnode *vdp = ap->a_vp;
295 struct filecore_node *dp;
296 struct buf *bp = NULL;
297 struct dirent *de;
298 struct filecore_direntry *dep = NULL;
299 int error = 0;
300 off_t *cookies = NULL;
301 int ncookies = 0;
302 int i;
303 off_t uiooff;
304
305 dp = VTOI(vdp);
306
307 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0)
308 return (ENOTDIR);
309
310 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0)
311 return (EINVAL);
312 i = uio->uio_offset / FILECORE_DIRENT_SIZE;
313 uiooff = uio->uio_offset;
314
315 *ap->a_eofflag = 0;
316
317 error = filecore_dbread(dp, &bp);
318 if (error) {
319 return error;
320 }
321
322 if (ap->a_ncookies == NULL)
323 cookies = NULL;
324 else {
325 *ap->a_ncookies = 0;
326 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0);
327 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
328 }
329
330 de = kmem_zalloc(sizeof(struct dirent), KM_SLEEP);
331
332 for (; ; i++) {
333 switch (i) {
334 case 0:
335 /* Fake the '.' entry */
336 de->d_fileno = dp->i_number;
337 de->d_type = DT_DIR;
338 de->d_namlen = 1;
339 strlcpy(de->d_name, ".", sizeof(de->d_name));
340 break;
341 case 1:
342 /* Fake the '..' entry */
343 de->d_fileno = filecore_getparent(dp);
344 de->d_type = DT_DIR;
345 de->d_namlen = 2;
346 strlcpy(de->d_name, "..", sizeof(de->d_name));
347 break;
348 default:
349 de->d_fileno = dp->i_dirent.addr +
350 ((i - 2) << FILECORE_INO_INDEX);
351 dep = fcdirentry(bp->b_data, i - 2);
352 if (dep->attr & FILECORE_ATTR_DIR)
353 de->d_type = DT_DIR;
354 else
355 de->d_type = DT_REG;
356 if (filecore_fn2unix(dep->name, de->d_name,
357 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/
358 &de->d_namlen)) {
359 *ap->a_eofflag = 1;
360 goto out;
361 }
362 break;
363 }
364 de->d_reclen = _DIRENT_SIZE(de);
365 if (uio->uio_resid < de->d_reclen)
366 goto out;
367 error = uiomove(de, de->d_reclen, uio);
368 if (error)
369 goto out;
370 uiooff += FILECORE_DIRENT_SIZE;
371
372 if (cookies) {
373 *cookies++ = i*FILECORE_DIRENT_SIZE;
374 (*ap->a_ncookies)++;
375 if (--ncookies == 0) goto out;
376 }
377 }
378 out:
379 if (cookies) {
380 *ap->a_cookies = cookies;
381 if (error) {
382 free(cookies, M_TEMP);
383 *ap->a_ncookies = 0;
384 *ap->a_cookies = NULL;
385 }
386 }
387 uio->uio_offset = uiooff;
388
389 #ifdef FILECORE_DEBUG_BR
390 printf("brelse(%p) vn3\n", bp);
391 #endif
392 brelse (bp, 0);
393
394 kmem_free(de, sizeof(*de));
395
396 return (error);
397 }
398
399 /*
400 * Return target name of a symbolic link
401 * Shouldn't we get the parent vnode and read the data from there?
402 * This could eventually result in deadlocks in filecore_lookup.
403 * But otherwise the block read here is in the block buffer two times.
404 */
405 int
filecore_readlink(void * v)406 filecore_readlink(void *v)
407 {
408 #if 0
409 struct vop_readlink_args /* {
410 struct vnode *a_vp;
411 struct uio *a_uio;
412 kauth_cred_t a_cred;
413 } */ *ap = v;
414 #endif
415
416 return (EINVAL);
417 }
418
419 /*
420 * Calculate the logical to physical mapping if not done already,
421 * then call the device strategy routine.
422 */
423 int
filecore_strategy(void * v)424 filecore_strategy(void *v)
425 {
426 struct vop_strategy_args /* {
427 struct vnode *a_vp;
428 struct buf *a_bp;
429 } */ *ap = v;
430 struct buf *bp = ap->a_bp;
431 struct vnode *vp = ap->a_vp;
432 struct filecore_node *ip;
433 int error;
434
435 ip = VTOI(vp);
436 if (bp->b_blkno == bp->b_lblkno) {
437 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
438 if (error) {
439 bp->b_error = error;
440 biodone(bp);
441 return (error);
442 }
443 if ((long)bp->b_blkno == -1)
444 clrbuf(bp);
445 }
446 if ((long)bp->b_blkno == -1) {
447 biodone(bp);
448 return (0);
449 }
450 vp = ip->i_devvp;
451 return (VOP_STRATEGY(vp, bp));
452 }
453
454 /*
455 * Print out the contents of an inode.
456 */
457 /*ARGSUSED*/
458 int
filecore_print(void * v)459 filecore_print(void *v)
460 {
461
462 printf("tag VT_FILECORE, filecore vnode\n");
463 return (0);
464 }
465
466 /*
467 * Return POSIX pathconf information applicable to filecore filesystems.
468 */
469 int
filecore_pathconf(void * v)470 filecore_pathconf(void *v)
471 {
472 struct vop_pathconf_args /* {
473 struct vnode *a_vp;
474 int a_name;
475 register_t *a_retval;
476 } */ *ap = v;
477 switch (ap->a_name) {
478 case _PC_LINK_MAX:
479 *ap->a_retval = 1;
480 return (0);
481 case _PC_NAME_MAX:
482 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax;
483 return (0);
484 case _PC_PATH_MAX:
485 *ap->a_retval = 256;
486 return (0);
487 case _PC_CHOWN_RESTRICTED:
488 *ap->a_retval = 1;
489 return (0);
490 case _PC_NO_TRUNC:
491 *ap->a_retval = 1;
492 return (0);
493 case _PC_SYNC_IO:
494 *ap->a_retval = 1;
495 return (0);
496 case _PC_FILESIZEBITS:
497 *ap->a_retval = 32;
498 return (0);
499 default:
500 return genfs_pathconf(ap);
501 }
502 /* NOTREACHED */
503 }
504
505 /*
506 * Global vfs data structures for filecore
507 */
508 int (**filecore_vnodeop_p)(void *);
509 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = {
510 { &vop_default_desc, vn_default_error },
511 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */
512 { &vop_lookup_desc, filecore_lookup }, /* lookup */
513 { &vop_create_desc, genfs_eopnotsupp }, /* create */
514 { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */
515 { &vop_open_desc, genfs_nullop }, /* open */
516 { &vop_close_desc, genfs_nullop }, /* close */
517 { &vop_access_desc, filecore_access }, /* access */
518 { &vop_accessx_desc, genfs_accessx }, /* accessx */
519 { &vop_getattr_desc, filecore_getattr }, /* getattr */
520 { &vop_setattr_desc, genfs_eopnotsupp }, /* setattr */
521 { &vop_read_desc, filecore_read }, /* read */
522 { &vop_write_desc, genfs_eopnotsupp }, /* write */
523 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */
524 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */
525 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
526 { &vop_ioctl_desc, genfs_enoioctl }, /* ioctl */
527 { &vop_poll_desc, genfs_poll }, /* poll */
528 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */
529 { &vop_revoke_desc, genfs_revoke }, /* revoke */
530 { &vop_mmap_desc, genfs_mmap }, /* mmap */
531 { &vop_fsync_desc, genfs_nullop }, /* fsync */
532 { &vop_seek_desc, genfs_seek }, /* seek */
533 { &vop_remove_desc, genfs_eopnotsupp }, /* remove */
534 { &vop_link_desc, genfs_erofs_link }, /* link */
535 { &vop_rename_desc, genfs_eopnotsupp }, /* rename */
536 { &vop_mkdir_desc, genfs_eopnotsupp }, /* mkdir */
537 { &vop_rmdir_desc, genfs_eopnotsupp }, /* rmdir */
538 { &vop_symlink_desc, genfs_erofs_symlink }, /* symlink */
539 { &vop_readdir_desc, filecore_readdir }, /* readdir */
540 { &vop_readlink_desc, filecore_readlink }, /* readlink */
541 { &vop_abortop_desc, genfs_abortop }, /* abortop */
542 { &vop_inactive_desc, filecore_inactive }, /* inactive */
543 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */
544 { &vop_lock_desc, genfs_lock }, /* lock */
545 { &vop_unlock_desc, genfs_unlock }, /* unlock */
546 { &vop_bmap_desc, filecore_bmap }, /* bmap */
547 { &vop_strategy_desc, filecore_strategy }, /* strategy */
548 { &vop_print_desc, filecore_print }, /* print */
549 { &vop_islocked_desc, genfs_islocked }, /* islocked */
550 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */
551 { &vop_advlock_desc, genfs_eopnotsupp }, /* advlock */
552 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */
553 { &vop_getpages_desc, genfs_getpages }, /* getpages */
554 { &vop_putpages_desc, genfs_putpages }, /* putpages */
555 { NULL, NULL }
556 };
557 const struct vnodeopv_desc filecore_vnodeop_opv_desc =
558 { &filecore_vnodeop_p, filecore_vnodeop_entries };
559