1 | /* $NetBSD: kernfs_vnops.c,v 1.156 2016/08/20 12:37:09 hannken Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1992, 1993 |
5 | * The Regents of the University of California. All rights reserved. |
6 | * |
7 | * This code is derived from software donated to Berkeley by |
8 | * Jan-Simon Pendry. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * 3. Neither the name of the University nor the names of its contributors |
19 | * may be used to endorse or promote products derived from this software |
20 | * without specific prior written permission. |
21 | * |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
32 | * SUCH DAMAGE. |
33 | * |
34 | * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 |
35 | */ |
36 | |
37 | /* |
38 | * Kernel parameter filesystem (/kern) |
39 | */ |
40 | |
41 | #include <sys/cdefs.h> |
42 | __KERNEL_RCSID(0, "$NetBSD: kernfs_vnops.c,v 1.156 2016/08/20 12:37:09 hannken Exp $" ); |
43 | |
44 | #include <sys/param.h> |
45 | #include <sys/systm.h> |
46 | #include <sys/kernel.h> |
47 | #include <sys/vmmeter.h> |
48 | #include <sys/time.h> |
49 | #include <sys/proc.h> |
50 | #include <sys/vnode.h> |
51 | #include <sys/malloc.h> |
52 | #include <sys/file.h> |
53 | #include <sys/stat.h> |
54 | #include <sys/mount.h> |
55 | #include <sys/namei.h> |
56 | #include <sys/buf.h> |
57 | #include <sys/dirent.h> |
58 | #include <sys/msgbuf.h> |
59 | |
60 | #include <miscfs/genfs/genfs.h> |
61 | #include <miscfs/kernfs/kernfs.h> |
62 | #include <miscfs/specfs/specdev.h> |
63 | |
64 | #include <uvm/uvm_extern.h> |
65 | |
66 | #define KSTRING 256 /* Largest I/O available via this filesystem */ |
67 | #define UIO_MX 32 |
68 | |
69 | #define READ_MODE (S_IRUSR|S_IRGRP|S_IROTH) |
70 | #define WRITE_MODE (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH) |
71 | #define UREAD_MODE (S_IRUSR) |
72 | #define DIR_MODE (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) |
73 | #define UDIR_MODE (S_IRUSR|S_IXUSR) |
74 | |
75 | #define N(s) sizeof(s)-1, s |
76 | const struct kern_target kern_targets[] = { |
77 | /* NOTE: The name must be less than UIO_MX-16 chars in length */ |
78 | /* name data tag type ro/rw */ |
79 | { DT_DIR, N("." ), 0, KFSkern, VDIR, DIR_MODE }, |
80 | { DT_DIR, N(".." ), 0, KFSroot, VDIR, DIR_MODE }, |
81 | { DT_REG, N("boottime" ), &boottime.tv_sec, KFSint, VREG, READ_MODE }, |
82 | /* XXXUNCONST */ |
83 | { DT_REG, N("copyright" ), __UNCONST(copyright), |
84 | KFSstring, VREG, READ_MODE }, |
85 | { DT_REG, N("hostname" ), 0, KFShostname, VREG, WRITE_MODE }, |
86 | { DT_REG, N("hz" ), &hz, KFSint, VREG, READ_MODE }, |
87 | { DT_REG, N("loadavg" ), 0, KFSavenrun, VREG, READ_MODE }, |
88 | { DT_REG, N("msgbuf" ), 0, KFSmsgbuf, VREG, READ_MODE }, |
89 | { DT_REG, N("pagesize" ), &uvmexp.pagesize, KFSint, VREG, READ_MODE }, |
90 | { DT_REG, N("physmem" ), &physmem, KFSint, VREG, READ_MODE }, |
91 | #if 0 |
92 | { DT_DIR, N("root" ), 0, KFSnull, VDIR, DIR_MODE }, |
93 | #endif |
94 | { DT_BLK, N("rootdev" ), &rootdev, KFSdevice, VBLK, READ_MODE }, |
95 | { DT_CHR, N("rrootdev" ), &rrootdev, KFSdevice, VCHR, READ_MODE }, |
96 | { DT_REG, N("time" ), 0, KFStime, VREG, READ_MODE }, |
97 | /* XXXUNCONST */ |
98 | { DT_REG, N("version" ), __UNCONST(version), |
99 | KFSstring, VREG, READ_MODE }, |
100 | }; |
101 | const struct kern_target subdir_targets[] = { |
102 | /* NOTE: The name must be less than UIO_MX-16 chars in length */ |
103 | /* name data tag type ro/rw */ |
104 | { DT_DIR, N("." ), 0, KFSsubdir, VDIR, DIR_MODE }, |
105 | { DT_DIR, N(".." ), 0, KFSkern, VDIR, DIR_MODE }, |
106 | }; |
107 | #undef N |
108 | SIMPLEQ_HEAD(,dyn_kern_target) dyn_kern_targets = |
109 | SIMPLEQ_HEAD_INITIALIZER(dyn_kern_targets); |
110 | int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]); |
111 | const int static_nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]); |
112 | int nkern_dirs = 2; |
113 | |
114 | int kernfs_try_fileop(kfstype, kfsfileop, void *, int); |
115 | int kernfs_try_xread(kfstype, const struct kernfs_node *, char **, |
116 | size_t, int); |
117 | int kernfs_try_xwrite(kfstype, const struct kernfs_node *, char *, |
118 | size_t, int); |
119 | |
120 | static int kernfs_default_xread(void *v); |
121 | static int kernfs_default_xwrite(void *v); |
122 | static int kernfs_default_fileop_getattr(void *); |
123 | |
124 | /* must include all fileop's */ |
125 | const struct kernfs_fileop kernfs_default_fileops[] = { |
126 | { .kf_fileop = KERNFS_XREAD }, |
127 | { .kf_fileop = KERNFS_XWRITE }, |
128 | { .kf_fileop = KERNFS_FILEOP_OPEN }, |
129 | { .kf_fileop = KERNFS_FILEOP_GETATTR, |
130 | .kf_vop = kernfs_default_fileop_getattr }, |
131 | { .kf_fileop = KERNFS_FILEOP_IOCTL }, |
132 | { .kf_fileop = KERNFS_FILEOP_CLOSE }, |
133 | { .kf_fileop = KERNFS_FILEOP_READ, |
134 | .kf_vop = kernfs_default_xread }, |
135 | { .kf_fileop = KERNFS_FILEOP_WRITE, |
136 | .kf_vop = kernfs_default_xwrite }, |
137 | }; |
138 | |
139 | int kernfs_lookup(void *); |
140 | #define kernfs_create genfs_eopnotsupp |
141 | #define kernfs_mknod genfs_eopnotsupp |
142 | int kernfs_open(void *); |
143 | int kernfs_close(void *); |
144 | int kernfs_access(void *); |
145 | int kernfs_getattr(void *); |
146 | int kernfs_setattr(void *); |
147 | int kernfs_read(void *); |
148 | int kernfs_write(void *); |
149 | #define kernfs_fcntl genfs_fcntl |
150 | int kernfs_ioctl(void *); |
151 | #define kernfs_poll genfs_poll |
152 | #define kernfs_revoke genfs_revoke |
153 | #define kernfs_fsync genfs_nullop |
154 | #define kernfs_seek genfs_nullop |
155 | #define kernfs_remove genfs_eopnotsupp |
156 | int kernfs_link(void *); |
157 | #define kernfs_rename genfs_eopnotsupp |
158 | #define kernfs_mkdir genfs_eopnotsupp |
159 | #define kernfs_rmdir genfs_eopnotsupp |
160 | int kernfs_symlink(void *); |
161 | int kernfs_readdir(void *); |
162 | #define kernfs_readlink genfs_eopnotsupp |
163 | #define kernfs_abortop genfs_abortop |
164 | int kernfs_inactive(void *); |
165 | int kernfs_reclaim(void *); |
166 | #define kernfs_lock genfs_lock |
167 | #define kernfs_unlock genfs_unlock |
168 | #define kernfs_bmap genfs_badop |
169 | #define kernfs_strategy genfs_badop |
170 | int kernfs_print(void *); |
171 | #define kernfs_islocked genfs_islocked |
172 | int kernfs_pathconf(void *); |
173 | #define kernfs_advlock genfs_einval |
174 | #define kernfs_bwrite genfs_eopnotsupp |
175 | #define kernfs_putpages genfs_putpages |
176 | |
177 | static int kernfs_xread(struct kernfs_node *, int, char **, |
178 | size_t, size_t *); |
179 | static int kernfs_xwrite(const struct kernfs_node *, char *, size_t); |
180 | |
181 | int (**kernfs_vnodeop_p)(void *); |
182 | const struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = { |
183 | { &vop_default_desc, vn_default_error }, |
184 | { &vop_lookup_desc, kernfs_lookup }, /* lookup */ |
185 | { &vop_create_desc, kernfs_create }, /* create */ |
186 | { &vop_mknod_desc, kernfs_mknod }, /* mknod */ |
187 | { &vop_open_desc, kernfs_open }, /* open */ |
188 | { &vop_close_desc, kernfs_close }, /* close */ |
189 | { &vop_access_desc, kernfs_access }, /* access */ |
190 | { &vop_getattr_desc, kernfs_getattr }, /* getattr */ |
191 | { &vop_setattr_desc, kernfs_setattr }, /* setattr */ |
192 | { &vop_read_desc, kernfs_read }, /* read */ |
193 | { &vop_write_desc, kernfs_write }, /* write */ |
194 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
195 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
196 | { &vop_fcntl_desc, kernfs_fcntl }, /* fcntl */ |
197 | { &vop_ioctl_desc, kernfs_ioctl }, /* ioctl */ |
198 | { &vop_poll_desc, kernfs_poll }, /* poll */ |
199 | { &vop_revoke_desc, kernfs_revoke }, /* revoke */ |
200 | { &vop_fsync_desc, kernfs_fsync }, /* fsync */ |
201 | { &vop_seek_desc, kernfs_seek }, /* seek */ |
202 | { &vop_remove_desc, kernfs_remove }, /* remove */ |
203 | { &vop_link_desc, kernfs_link }, /* link */ |
204 | { &vop_rename_desc, kernfs_rename }, /* rename */ |
205 | { &vop_mkdir_desc, kernfs_mkdir }, /* mkdir */ |
206 | { &vop_rmdir_desc, kernfs_rmdir }, /* rmdir */ |
207 | { &vop_symlink_desc, kernfs_symlink }, /* symlink */ |
208 | { &vop_readdir_desc, kernfs_readdir }, /* readdir */ |
209 | { &vop_readlink_desc, kernfs_readlink }, /* readlink */ |
210 | { &vop_abortop_desc, kernfs_abortop }, /* abortop */ |
211 | { &vop_inactive_desc, kernfs_inactive }, /* inactive */ |
212 | { &vop_reclaim_desc, kernfs_reclaim }, /* reclaim */ |
213 | { &vop_lock_desc, kernfs_lock }, /* lock */ |
214 | { &vop_unlock_desc, kernfs_unlock }, /* unlock */ |
215 | { &vop_bmap_desc, kernfs_bmap }, /* bmap */ |
216 | { &vop_strategy_desc, kernfs_strategy }, /* strategy */ |
217 | { &vop_print_desc, kernfs_print }, /* print */ |
218 | { &vop_islocked_desc, kernfs_islocked }, /* islocked */ |
219 | { &vop_pathconf_desc, kernfs_pathconf }, /* pathconf */ |
220 | { &vop_advlock_desc, kernfs_advlock }, /* advlock */ |
221 | { &vop_bwrite_desc, kernfs_bwrite }, /* bwrite */ |
222 | { &vop_putpages_desc, kernfs_putpages }, /* putpages */ |
223 | { NULL, NULL } |
224 | }; |
225 | const struct vnodeopv_desc kernfs_vnodeop_opv_desc = |
226 | { &kernfs_vnodeop_p, kernfs_vnodeop_entries }; |
227 | |
228 | static inline int |
229 | kernfs_fileop_compare(struct kernfs_fileop *a, struct kernfs_fileop *b) |
230 | { |
231 | if (a->kf_type < b->kf_type) |
232 | return -1; |
233 | if (a->kf_type > b->kf_type) |
234 | return 1; |
235 | if (a->kf_fileop < b->kf_fileop) |
236 | return -1; |
237 | if (a->kf_fileop > b->kf_fileop) |
238 | return 1; |
239 | return (0); |
240 | } |
241 | |
242 | SPLAY_HEAD(kfsfileoptree, kernfs_fileop) kfsfileoptree = |
243 | SPLAY_INITIALIZER(kfsfileoptree); |
244 | SPLAY_PROTOTYPE(kfsfileoptree, kernfs_fileop, kf_node, kernfs_fileop_compare); |
245 | SPLAY_GENERATE(kfsfileoptree, kernfs_fileop, kf_node, kernfs_fileop_compare); |
246 | |
247 | kfstype |
248 | kernfs_alloctype(int nkf, const struct kernfs_fileop *kf) |
249 | { |
250 | static u_char nextfreetype = KFSlasttype; |
251 | struct kernfs_fileop *dkf, *fkf, skf; |
252 | int i; |
253 | |
254 | /* XXX need to keep track of dkf's memory if we support |
255 | deallocating types */ |
256 | dkf = malloc(sizeof(kernfs_default_fileops), M_TEMP, M_WAITOK); |
257 | memcpy(dkf, kernfs_default_fileops, sizeof(kernfs_default_fileops)); |
258 | |
259 | for (i = 0; i < sizeof(kernfs_default_fileops) / |
260 | sizeof(kernfs_default_fileops[0]); i++) { |
261 | dkf[i].kf_type = nextfreetype; |
262 | SPLAY_INSERT(kfsfileoptree, &kfsfileoptree, &dkf[i]); |
263 | } |
264 | |
265 | for (i = 0; i < nkf; i++) { |
266 | skf.kf_type = nextfreetype; |
267 | skf.kf_fileop = kf[i].kf_fileop; |
268 | if ((fkf = SPLAY_FIND(kfsfileoptree, &kfsfileoptree, &skf))) |
269 | fkf->kf_vop = kf[i].kf_vop; |
270 | } |
271 | |
272 | return nextfreetype++; |
273 | } |
274 | |
275 | int |
276 | kernfs_try_fileop(kfstype type, kfsfileop fileop, void *v, int error) |
277 | { |
278 | struct kernfs_fileop *kf, skf; |
279 | |
280 | skf.kf_type = type; |
281 | skf.kf_fileop = fileop; |
282 | if ((kf = SPLAY_FIND(kfsfileoptree, &kfsfileoptree, &skf))) |
283 | if (kf->kf_vop) |
284 | return kf->kf_vop(v); |
285 | return error; |
286 | } |
287 | |
288 | int |
289 | kernfs_try_xread(kfstype type, const struct kernfs_node *kfs, char **bfp, |
290 | size_t len, int error) |
291 | { |
292 | struct kernfs_fileop *kf, skf; |
293 | |
294 | skf.kf_type = type; |
295 | skf.kf_fileop = KERNFS_XREAD; |
296 | if ((kf = SPLAY_FIND(kfsfileoptree, &kfsfileoptree, &skf))) |
297 | if (kf->kf_xread) |
298 | return kf->kf_xread(kfs, bfp, len); |
299 | return error; |
300 | } |
301 | |
302 | int |
303 | kernfs_try_xwrite(kfstype type, const struct kernfs_node *kfs, char *bf, |
304 | size_t len, int error) |
305 | { |
306 | struct kernfs_fileop *kf, skf; |
307 | |
308 | skf.kf_type = type; |
309 | skf.kf_fileop = KERNFS_XWRITE; |
310 | if ((kf = SPLAY_FIND(kfsfileoptree, &kfsfileoptree, &skf))) |
311 | if (kf->kf_xwrite) |
312 | return kf->kf_xwrite(kfs, bf, len); |
313 | return error; |
314 | } |
315 | |
316 | int |
317 | kernfs_addentry(kernfs_parentdir_t *pkt, kernfs_entry_t *dkt) |
318 | { |
319 | struct kernfs_subdir *ks, *parent; |
320 | |
321 | if (pkt == NULL) { |
322 | SIMPLEQ_INSERT_TAIL(&dyn_kern_targets, dkt, dkt_queue); |
323 | nkern_targets++; |
324 | if (dkt->dkt_kt.kt_vtype == VDIR) |
325 | nkern_dirs++; |
326 | } else { |
327 | parent = (struct kernfs_subdir *)pkt->kt_data; |
328 | SIMPLEQ_INSERT_TAIL(&parent->ks_entries, dkt, dkt_queue); |
329 | parent->ks_nentries++; |
330 | if (dkt->dkt_kt.kt_vtype == VDIR) |
331 | parent->ks_dirs++; |
332 | } |
333 | if (dkt->dkt_kt.kt_vtype == VDIR && dkt->dkt_kt.kt_data == NULL) { |
334 | ks = malloc(sizeof(struct kernfs_subdir), |
335 | M_TEMP, M_WAITOK); |
336 | SIMPLEQ_INIT(&ks->ks_entries); |
337 | ks->ks_nentries = 2; /* . and .. */ |
338 | ks->ks_dirs = 2; |
339 | ks->ks_parent = pkt ? pkt : &kern_targets[0]; |
340 | dkt->dkt_kt.kt_data = ks; |
341 | } |
342 | return 0; |
343 | } |
344 | |
345 | static int |
346 | kernfs_xread(struct kernfs_node *kfs, int off, char **bufp, size_t len, size_t *wrlen) |
347 | { |
348 | const struct kern_target *kt; |
349 | int err; |
350 | |
351 | kt = kfs->kfs_kt; |
352 | |
353 | switch (kfs->kfs_type) { |
354 | case KFStime: { |
355 | struct timeval tv; |
356 | |
357 | microtime(&tv); |
358 | snprintf(*bufp, len, "%lld %ld\n" , (long long)tv.tv_sec, |
359 | (long)tv.tv_usec); |
360 | break; |
361 | } |
362 | |
363 | case KFSint: { |
364 | int *ip = kt->kt_data; |
365 | |
366 | snprintf(*bufp, len, "%d\n" , *ip); |
367 | break; |
368 | } |
369 | |
370 | case KFSstring: { |
371 | char *cp = kt->kt_data; |
372 | |
373 | *bufp = cp; |
374 | break; |
375 | } |
376 | |
377 | case KFSmsgbuf: { |
378 | long n; |
379 | |
380 | /* |
381 | * deal with cases where the message buffer has |
382 | * become corrupted. |
383 | */ |
384 | if (!msgbufenabled || msgbufp->msg_magic != MSG_MAGIC) { |
385 | msgbufenabled = 0; |
386 | return (ENXIO); |
387 | } |
388 | |
389 | /* |
390 | * Note that reads of /kern/msgbuf won't necessarily yield |
391 | * consistent results, if the message buffer is modified |
392 | * while the read is in progress. The worst that can happen |
393 | * is that incorrect data will be read. There's no way |
394 | * that this can crash the system unless the values in the |
395 | * message buffer header are corrupted, but that'll cause |
396 | * the system to die anyway. |
397 | */ |
398 | if (off >= msgbufp->msg_bufs) { |
399 | *wrlen = 0; |
400 | return (0); |
401 | } |
402 | n = msgbufp->msg_bufx + off; |
403 | if (n >= msgbufp->msg_bufs) |
404 | n -= msgbufp->msg_bufs; |
405 | len = min(msgbufp->msg_bufs - n, msgbufp->msg_bufs - off); |
406 | *bufp = msgbufp->msg_bufc + n; |
407 | *wrlen = len; |
408 | return (0); |
409 | } |
410 | |
411 | case KFShostname: { |
412 | char *cp = hostname; |
413 | size_t xlen = hostnamelen; |
414 | |
415 | if (xlen >= (len - 2)) |
416 | return (EINVAL); |
417 | |
418 | memcpy(*bufp, cp, xlen); |
419 | (*bufp)[xlen] = '\n'; |
420 | (*bufp)[xlen+1] = '\0'; |
421 | break; |
422 | } |
423 | |
424 | case KFSavenrun: |
425 | averunnable.fscale = FSCALE; |
426 | snprintf(*bufp, len, "%d %d %d %ld\n" , |
427 | averunnable.ldavg[0], averunnable.ldavg[1], |
428 | averunnable.ldavg[2], averunnable.fscale); |
429 | break; |
430 | |
431 | default: |
432 | err = kernfs_try_xread(kfs->kfs_type, kfs, bufp, len, |
433 | EOPNOTSUPP); |
434 | if (err) |
435 | return err; |
436 | } |
437 | |
438 | len = strlen(*bufp); |
439 | if (len <= off) |
440 | *wrlen = 0; |
441 | else { |
442 | *bufp += off; |
443 | *wrlen = len - off; |
444 | } |
445 | return (0); |
446 | } |
447 | |
448 | static int |
449 | kernfs_xwrite(const struct kernfs_node *kfs, char *bf, size_t len) |
450 | { |
451 | |
452 | switch (kfs->kfs_type) { |
453 | case KFShostname: |
454 | if (bf[len-1] == '\n') |
455 | --len; |
456 | memcpy(hostname, bf, len); |
457 | hostname[len] = '\0'; |
458 | hostnamelen = (size_t) len; |
459 | return (0); |
460 | |
461 | default: |
462 | return kernfs_try_xwrite(kfs->kfs_type, kfs, bf, len, EIO); |
463 | } |
464 | } |
465 | |
466 | |
467 | /* |
468 | * vp is the current namei directory |
469 | * ndp is the name to locate in that directory... |
470 | */ |
471 | int |
472 | kernfs_lookup(void *v) |
473 | { |
474 | struct vop_lookup_v2_args /* { |
475 | struct vnode * a_dvp; |
476 | struct vnode ** a_vpp; |
477 | struct componentname * a_cnp; |
478 | } */ *ap = v; |
479 | struct componentname *cnp = ap->a_cnp; |
480 | struct vnode **vpp = ap->a_vpp; |
481 | struct vnode *dvp = ap->a_dvp; |
482 | const char *pname = cnp->cn_nameptr; |
483 | const struct kernfs_node *kfs; |
484 | const struct kern_target *kt; |
485 | const struct dyn_kern_target *dkt; |
486 | const struct kernfs_subdir *ks; |
487 | int error, i; |
488 | |
489 | *vpp = NULLVP; |
490 | |
491 | if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) |
492 | return (EROFS); |
493 | |
494 | if (cnp->cn_namelen == 1 && *pname == '.') { |
495 | *vpp = dvp; |
496 | vref(dvp); |
497 | return (0); |
498 | } |
499 | |
500 | kfs = VTOKERN(dvp); |
501 | switch (kfs->kfs_type) { |
502 | case KFSkern: |
503 | /* |
504 | * Shouldn't get here with .. in the root node. |
505 | */ |
506 | if (cnp->cn_flags & ISDOTDOT) |
507 | return (EIO); |
508 | |
509 | for (i = 0; i < static_nkern_targets; i++) { |
510 | kt = &kern_targets[i]; |
511 | if (cnp->cn_namelen == kt->kt_namlen && |
512 | memcmp(kt->kt_name, pname, cnp->cn_namelen) == 0) |
513 | goto found; |
514 | } |
515 | SIMPLEQ_FOREACH(dkt, &dyn_kern_targets, dkt_queue) { |
516 | if (cnp->cn_namelen == dkt->dkt_kt.kt_namlen && |
517 | memcmp(dkt->dkt_kt.kt_name, pname, cnp->cn_namelen) == 0) { |
518 | kt = &dkt->dkt_kt; |
519 | goto found; |
520 | } |
521 | } |
522 | break; |
523 | |
524 | found: |
525 | error = vcache_get(dvp->v_mount, &kt, sizeof(kt), vpp); |
526 | return error; |
527 | |
528 | case KFSsubdir: |
529 | ks = (struct kernfs_subdir *)kfs->kfs_kt->kt_data; |
530 | if (cnp->cn_flags & ISDOTDOT) { |
531 | kt = ks->ks_parent; |
532 | goto found; |
533 | } |
534 | |
535 | SIMPLEQ_FOREACH(dkt, &ks->ks_entries, dkt_queue) { |
536 | if (cnp->cn_namelen == dkt->dkt_kt.kt_namlen && |
537 | memcmp(dkt->dkt_kt.kt_name, pname, cnp->cn_namelen) == 0) { |
538 | kt = &dkt->dkt_kt; |
539 | goto found; |
540 | } |
541 | } |
542 | break; |
543 | |
544 | default: |
545 | return (ENOTDIR); |
546 | } |
547 | |
548 | return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS); |
549 | } |
550 | |
551 | int |
552 | kernfs_open(void *v) |
553 | { |
554 | struct vop_open_args /* { |
555 | struct vnode *a_vp; |
556 | int a_mode; |
557 | kauth_cred_t a_cred; |
558 | } */ *ap = v; |
559 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
560 | |
561 | return kernfs_try_fileop(kfs->kfs_type, KERNFS_FILEOP_OPEN, v, 0); |
562 | } |
563 | |
564 | int |
565 | kernfs_close(void *v) |
566 | { |
567 | struct vop_close_args /* { |
568 | struct vnode *a_vp; |
569 | int a_fflag; |
570 | kauth_cred_t a_cred; |
571 | } */ *ap = v; |
572 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
573 | |
574 | return kernfs_try_fileop(kfs->kfs_type, KERNFS_FILEOP_CLOSE, v, 0); |
575 | } |
576 | |
577 | int |
578 | kernfs_access(void *v) |
579 | { |
580 | struct vop_access_args /* { |
581 | struct vnode *a_vp; |
582 | int a_mode; |
583 | kauth_cred_t a_cred; |
584 | } */ *ap = v; |
585 | struct vattr va; |
586 | int error; |
587 | |
588 | if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred)) != 0) |
589 | return (error); |
590 | |
591 | return kauth_authorize_vnode(ap->a_cred, |
592 | KAUTH_ACCESS_ACTION(ap->a_mode, ap->a_vp->v_type, va.va_mode), |
593 | ap->a_vp, NULL, genfs_can_access(va.va_type, va.va_mode, |
594 | va.va_uid, va.va_gid, ap->a_mode, ap->a_cred)); |
595 | } |
596 | |
597 | static int |
598 | kernfs_default_fileop_getattr(void *v) |
599 | { |
600 | struct vop_getattr_args /* { |
601 | struct vnode *a_vp; |
602 | struct vattr *a_vap; |
603 | kauth_cred_t a_cred; |
604 | } */ *ap = v; |
605 | struct vattr *vap = ap->a_vap; |
606 | |
607 | vap->va_nlink = 1; |
608 | vap->va_bytes = vap->va_size = 0; |
609 | |
610 | return 0; |
611 | } |
612 | |
613 | int |
614 | kernfs_getattr(void *v) |
615 | { |
616 | struct vop_getattr_args /* { |
617 | struct vnode *a_vp; |
618 | struct vattr *a_vap; |
619 | kauth_cred_t a_cred; |
620 | } */ *ap = v; |
621 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
622 | struct kernfs_subdir *ks; |
623 | struct vattr *vap = ap->a_vap; |
624 | int error = 0; |
625 | char strbuf[KSTRING], *bf; |
626 | size_t nread, total; |
627 | |
628 | vattr_null(vap); |
629 | vap->va_type = ap->a_vp->v_type; |
630 | vap->va_uid = 0; |
631 | vap->va_gid = 0; |
632 | vap->va_mode = kfs->kfs_mode; |
633 | vap->va_fileid = kfs->kfs_fileno; |
634 | vap->va_flags = 0; |
635 | vap->va_size = 0; |
636 | vap->va_blocksize = DEV_BSIZE; |
637 | /* Make all times be current TOD, except for the "boottime" node. */ |
638 | if (kfs->kfs_kt->kt_namlen == 8 && |
639 | !memcmp(kfs->kfs_kt->kt_name, "boottime" , 8)) { |
640 | vap->va_ctime = boottime; |
641 | } else { |
642 | getnanotime(&vap->va_ctime); |
643 | } |
644 | vap->va_atime = vap->va_mtime = vap->va_ctime; |
645 | vap->va_gen = 0; |
646 | vap->va_flags = 0; |
647 | vap->va_rdev = 0; |
648 | vap->va_bytes = 0; |
649 | |
650 | switch (kfs->kfs_type) { |
651 | case KFSkern: |
652 | vap->va_nlink = nkern_dirs; |
653 | vap->va_bytes = vap->va_size = DEV_BSIZE; |
654 | break; |
655 | |
656 | case KFSdevice: |
657 | vap->va_nlink = 1; |
658 | vap->va_rdev = ap->a_vp->v_rdev; |
659 | break; |
660 | |
661 | case KFSroot: |
662 | vap->va_nlink = 1; |
663 | vap->va_bytes = vap->va_size = DEV_BSIZE; |
664 | break; |
665 | |
666 | case KFSsubdir: |
667 | ks = (struct kernfs_subdir *)kfs->kfs_kt->kt_data; |
668 | vap->va_nlink = ks->ks_dirs; |
669 | vap->va_bytes = vap->va_size = DEV_BSIZE; |
670 | break; |
671 | |
672 | case KFSnull: |
673 | case KFStime: |
674 | case KFSint: |
675 | case KFSstring: |
676 | case KFShostname: |
677 | case KFSavenrun: |
678 | case KFSmsgbuf: |
679 | vap->va_nlink = 1; |
680 | total = 0; |
681 | do { |
682 | bf = strbuf; |
683 | error = kernfs_xread(kfs, total, &bf, |
684 | sizeof(strbuf), &nread); |
685 | total += nread; |
686 | } while (error == 0 && nread != 0); |
687 | vap->va_bytes = vap->va_size = total; |
688 | break; |
689 | |
690 | default: |
691 | error = kernfs_try_fileop(kfs->kfs_type, |
692 | KERNFS_FILEOP_GETATTR, v, EINVAL); |
693 | break; |
694 | } |
695 | |
696 | return (error); |
697 | } |
698 | |
699 | /*ARGSUSED*/ |
700 | int |
701 | kernfs_setattr(void *v) |
702 | { |
703 | |
704 | /* |
705 | * Silently ignore attribute changes. |
706 | * This allows for open with truncate to have no |
707 | * effect until some data is written. I want to |
708 | * do it this way because all writes are atomic. |
709 | */ |
710 | return (0); |
711 | } |
712 | |
713 | int |
714 | kernfs_default_xread(void *v) |
715 | { |
716 | struct vop_read_args /* { |
717 | struct vnode *a_vp; |
718 | struct uio *a_uio; |
719 | int a_ioflag; |
720 | kauth_cred_t a_cred; |
721 | } */ *ap = v; |
722 | struct uio *uio = ap->a_uio; |
723 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
724 | char strbuf[KSTRING], *bf; |
725 | int off; |
726 | size_t len; |
727 | int error; |
728 | |
729 | if (ap->a_vp->v_type == VDIR) |
730 | return EISDIR; |
731 | |
732 | off = (int)uio->uio_offset; |
733 | /* Don't allow negative offsets */ |
734 | if (off < 0) |
735 | return EINVAL; |
736 | |
737 | bf = strbuf; |
738 | if ((error = kernfs_xread(kfs, off, &bf, sizeof(strbuf), &len)) == 0) |
739 | error = uiomove(bf, len, uio); |
740 | return (error); |
741 | } |
742 | |
743 | int |
744 | kernfs_read(void *v) |
745 | { |
746 | struct vop_read_args /* { |
747 | struct vnode *a_vp; |
748 | struct uio *a_uio; |
749 | int a_ioflag; |
750 | struct ucred *a_cred; |
751 | } */ *ap = v; |
752 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
753 | |
754 | if (kfs->kfs_type < KFSlasttype) { |
755 | /* use default function */ |
756 | return kernfs_default_xread(v); |
757 | } |
758 | return kernfs_try_fileop(kfs->kfs_type, KERNFS_FILEOP_READ, v, |
759 | EOPNOTSUPP); |
760 | } |
761 | |
762 | static int |
763 | kernfs_default_xwrite(void *v) |
764 | { |
765 | struct vop_write_args /* { |
766 | struct vnode *a_vp; |
767 | struct uio *a_uio; |
768 | int a_ioflag; |
769 | kauth_cred_t a_cred; |
770 | } */ *ap = v; |
771 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
772 | struct uio *uio = ap->a_uio; |
773 | int error; |
774 | size_t xlen; |
775 | char strbuf[KSTRING]; |
776 | |
777 | if (uio->uio_offset != 0) |
778 | return (EINVAL); |
779 | |
780 | xlen = min(uio->uio_resid, KSTRING-1); |
781 | if ((error = uiomove(strbuf, xlen, uio)) != 0) |
782 | return (error); |
783 | |
784 | if (uio->uio_resid != 0) |
785 | return (EIO); |
786 | |
787 | strbuf[xlen] = '\0'; |
788 | xlen = strlen(strbuf); |
789 | return (kernfs_xwrite(kfs, strbuf, xlen)); |
790 | } |
791 | |
792 | int |
793 | kernfs_write(void *v) |
794 | { |
795 | struct vop_write_args /* { |
796 | struct vnode *a_vp; |
797 | struct uio *a_uio; |
798 | int a_ioflag; |
799 | kauth_cred_t a_cred; |
800 | } */ *ap = v; |
801 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
802 | |
803 | if (kfs->kfs_type < KFSlasttype) { |
804 | /* use default function */ |
805 | return kernfs_default_xwrite(v); |
806 | } |
807 | return kernfs_try_fileop(kfs->kfs_type, KERNFS_FILEOP_WRITE, v, |
808 | EOPNOTSUPP); |
809 | } |
810 | |
811 | int |
812 | kernfs_ioctl(void *v) |
813 | { |
814 | struct vop_ioctl_args /* { |
815 | const struct vnodeop_desc *a_desc; |
816 | struct vnode *a_vp; |
817 | u_long a_command; |
818 | void *a_data; |
819 | int a_fflag; |
820 | kauth_cred_t a_cred; |
821 | } */ *ap = v; |
822 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
823 | |
824 | return kernfs_try_fileop(kfs->kfs_type, KERNFS_FILEOP_IOCTL, v, |
825 | EPASSTHROUGH); |
826 | } |
827 | |
828 | static int |
829 | kernfs_setdirentfileno_kt(struct dirent *d, const struct kern_target *kt, |
830 | struct vop_readdir_args *ap) |
831 | { |
832 | struct kernfs_node *kfs; |
833 | struct vnode *vp; |
834 | int error; |
835 | |
836 | if ((error = vcache_get(ap->a_vp->v_mount, &kt, sizeof(kt), &vp)) != 0) |
837 | return error; |
838 | kfs = VTOKERN(vp); |
839 | d->d_fileno = kfs->kfs_fileno; |
840 | vrele(vp); |
841 | return 0; |
842 | } |
843 | |
844 | static int |
845 | kernfs_setdirentfileno(struct dirent *d, off_t entry, |
846 | struct kernfs_node *thisdir_kfs, const struct kern_target *parent_kt, |
847 | const struct kern_target *kt, struct vop_readdir_args *ap) |
848 | { |
849 | const struct kern_target *ikt; |
850 | int error; |
851 | |
852 | switch (entry) { |
853 | case 0: |
854 | d->d_fileno = thisdir_kfs->kfs_fileno; |
855 | return 0; |
856 | case 1: |
857 | ikt = parent_kt; |
858 | break; |
859 | default: |
860 | ikt = kt; |
861 | break; |
862 | } |
863 | if (ikt != thisdir_kfs->kfs_kt) { |
864 | if ((error = kernfs_setdirentfileno_kt(d, ikt, ap)) != 0) |
865 | return error; |
866 | } else |
867 | d->d_fileno = thisdir_kfs->kfs_fileno; |
868 | return 0; |
869 | } |
870 | |
871 | int |
872 | kernfs_readdir(void *v) |
873 | { |
874 | struct vop_readdir_args /* { |
875 | struct vnode *a_vp; |
876 | struct uio *a_uio; |
877 | kauth_cred_t a_cred; |
878 | int *a_eofflag; |
879 | off_t **a_cookies; |
880 | int a_*ncookies; |
881 | } */ *ap = v; |
882 | struct uio *uio = ap->a_uio; |
883 | struct dirent d; |
884 | struct kernfs_node *kfs = VTOKERN(ap->a_vp); |
885 | const struct kern_target *kt; |
886 | const struct dyn_kern_target *dkt = NULL; |
887 | const struct kernfs_subdir *ks; |
888 | off_t i, j; |
889 | int error; |
890 | off_t *cookies = NULL; |
891 | int ncookies = 0, n; |
892 | |
893 | if (uio->uio_resid < UIO_MX) |
894 | return (EINVAL); |
895 | if (uio->uio_offset < 0) |
896 | return (EINVAL); |
897 | |
898 | error = 0; |
899 | i = uio->uio_offset; |
900 | memset(&d, 0, sizeof(d)); |
901 | d.d_reclen = UIO_MX; |
902 | ncookies = uio->uio_resid / UIO_MX; |
903 | |
904 | switch (kfs->kfs_type) { |
905 | case KFSkern: |
906 | if (i >= nkern_targets) |
907 | return (0); |
908 | |
909 | if (ap->a_ncookies) { |
910 | ncookies = min(ncookies, (nkern_targets - i)); |
911 | cookies = malloc(ncookies * sizeof(off_t), M_TEMP, |
912 | M_WAITOK); |
913 | *ap->a_cookies = cookies; |
914 | } |
915 | |
916 | n = 0; |
917 | for (; i < nkern_targets && uio->uio_resid >= UIO_MX; i++) { |
918 | if (i < static_nkern_targets) |
919 | kt = &kern_targets[i]; |
920 | else { |
921 | if (dkt == NULL) { |
922 | dkt = SIMPLEQ_FIRST(&dyn_kern_targets); |
923 | for (j = static_nkern_targets; j < i && |
924 | dkt != NULL; j++) |
925 | dkt = SIMPLEQ_NEXT(dkt, dkt_queue); |
926 | if (j != i) |
927 | break; |
928 | } else { |
929 | dkt = SIMPLEQ_NEXT(dkt, dkt_queue); |
930 | } |
931 | if (dkt == NULL) |
932 | break; |
933 | kt = &dkt->dkt_kt; |
934 | } |
935 | if (kt->kt_tag == KFSdevice) { |
936 | dev_t *dp = kt->kt_data; |
937 | struct vnode *fvp; |
938 | |
939 | if (*dp == NODEV || |
940 | !vfinddev(*dp, kt->kt_vtype, &fvp)) |
941 | continue; |
942 | vrele(fvp); |
943 | } |
944 | if (kt->kt_tag == KFSmsgbuf) { |
945 | if (!msgbufenabled |
946 | || msgbufp->msg_magic != MSG_MAGIC) { |
947 | continue; |
948 | } |
949 | } |
950 | d.d_namlen = kt->kt_namlen; |
951 | if ((error = kernfs_setdirentfileno(&d, i, kfs, |
952 | &kern_targets[0], kt, ap)) != 0) |
953 | break; |
954 | memcpy(d.d_name, kt->kt_name, kt->kt_namlen + 1); |
955 | d.d_type = kt->kt_type; |
956 | if ((error = uiomove(&d, UIO_MX, uio)) != 0) |
957 | break; |
958 | if (cookies) |
959 | *cookies++ = i + 1; |
960 | n++; |
961 | } |
962 | ncookies = n; |
963 | break; |
964 | |
965 | case KFSroot: |
966 | if (i >= 2) |
967 | return 0; |
968 | |
969 | if (ap->a_ncookies) { |
970 | ncookies = min(ncookies, (2 - i)); |
971 | cookies = malloc(ncookies * sizeof(off_t), M_TEMP, |
972 | M_WAITOK); |
973 | *ap->a_cookies = cookies; |
974 | } |
975 | |
976 | n = 0; |
977 | for (; i < 2 && uio->uio_resid >= UIO_MX; i++) { |
978 | kt = &kern_targets[i]; |
979 | d.d_namlen = kt->kt_namlen; |
980 | d.d_fileno = KERNFS_FILENO(kt, kt->kt_tag, 0); |
981 | memcpy(d.d_name, kt->kt_name, kt->kt_namlen + 1); |
982 | d.d_type = kt->kt_type; |
983 | if ((error = uiomove(&d, UIO_MX, uio)) != 0) |
984 | break; |
985 | if (cookies) |
986 | *cookies++ = i + 1; |
987 | n++; |
988 | } |
989 | ncookies = n; |
990 | break; |
991 | |
992 | case KFSsubdir: |
993 | ks = (struct kernfs_subdir *)kfs->kfs_kt->kt_data; |
994 | if (i >= ks->ks_nentries) |
995 | return (0); |
996 | |
997 | if (ap->a_ncookies) { |
998 | ncookies = min(ncookies, (ks->ks_nentries - i)); |
999 | cookies = malloc(ncookies * sizeof(off_t), M_TEMP, |
1000 | M_WAITOK); |
1001 | *ap->a_cookies = cookies; |
1002 | } |
1003 | |
1004 | dkt = SIMPLEQ_FIRST(&ks->ks_entries); |
1005 | for (j = 0; j < i && dkt != NULL; j++) |
1006 | dkt = SIMPLEQ_NEXT(dkt, dkt_queue); |
1007 | n = 0; |
1008 | for (; i < ks->ks_nentries && uio->uio_resid >= UIO_MX; i++) { |
1009 | if (i < 2) |
1010 | kt = &subdir_targets[i]; |
1011 | else { |
1012 | /* check if ks_nentries lied to us */ |
1013 | if (dkt == NULL) |
1014 | break; |
1015 | kt = &dkt->dkt_kt; |
1016 | dkt = SIMPLEQ_NEXT(dkt, dkt_queue); |
1017 | } |
1018 | if (kt->kt_tag == KFSdevice) { |
1019 | dev_t *dp = kt->kt_data; |
1020 | struct vnode *fvp; |
1021 | |
1022 | if (*dp == NODEV || |
1023 | !vfinddev(*dp, kt->kt_vtype, &fvp)) |
1024 | continue; |
1025 | vrele(fvp); |
1026 | } |
1027 | d.d_namlen = kt->kt_namlen; |
1028 | if ((error = kernfs_setdirentfileno(&d, i, kfs, |
1029 | ks->ks_parent, kt, ap)) != 0) |
1030 | break; |
1031 | memcpy(d.d_name, kt->kt_name, kt->kt_namlen + 1); |
1032 | d.d_type = kt->kt_type; |
1033 | if ((error = uiomove(&d, UIO_MX, uio)) != 0) |
1034 | break; |
1035 | if (cookies) |
1036 | *cookies++ = i + 1; |
1037 | n++; |
1038 | } |
1039 | ncookies = n; |
1040 | break; |
1041 | |
1042 | default: |
1043 | error = ENOTDIR; |
1044 | break; |
1045 | } |
1046 | |
1047 | if (ap->a_ncookies) { |
1048 | if (error) { |
1049 | if (cookies) |
1050 | free(*ap->a_cookies, M_TEMP); |
1051 | *ap->a_ncookies = 0; |
1052 | *ap->a_cookies = NULL; |
1053 | } else |
1054 | *ap->a_ncookies = ncookies; |
1055 | } |
1056 | |
1057 | uio->uio_offset = i; |
1058 | return (error); |
1059 | } |
1060 | |
1061 | int |
1062 | kernfs_inactive(void *v) |
1063 | { |
1064 | struct vop_inactive_args /* { |
1065 | struct vnode *a_vp; |
1066 | bool *a_recycle; |
1067 | } */ *ap = v; |
1068 | struct vnode *vp = ap->a_vp; |
1069 | |
1070 | *ap->a_recycle = false; |
1071 | VOP_UNLOCK(vp); |
1072 | return (0); |
1073 | } |
1074 | |
1075 | int |
1076 | kernfs_reclaim(void *v) |
1077 | { |
1078 | struct vop_reclaim_args /* { |
1079 | struct vnode *a_vp; |
1080 | } */ *ap = v; |
1081 | struct vnode *vp = ap->a_vp; |
1082 | struct kernfs_node *kfs = VTOKERN(vp); |
1083 | |
1084 | vp->v_data = NULL; |
1085 | mutex_enter(&kfs_lock); |
1086 | TAILQ_REMOVE(&VFSTOKERNFS(vp->v_mount)->nodelist, kfs, kfs_list); |
1087 | mutex_exit(&kfs_lock); |
1088 | kmem_free(kfs, sizeof(struct kernfs_node)); |
1089 | |
1090 | return 0; |
1091 | } |
1092 | |
1093 | /* |
1094 | * Return POSIX pathconf information applicable to special devices. |
1095 | */ |
1096 | int |
1097 | kernfs_pathconf(void *v) |
1098 | { |
1099 | struct vop_pathconf_args /* { |
1100 | struct vnode *a_vp; |
1101 | int a_name; |
1102 | register_t *a_retval; |
1103 | } */ *ap = v; |
1104 | |
1105 | switch (ap->a_name) { |
1106 | case _PC_LINK_MAX: |
1107 | *ap->a_retval = LINK_MAX; |
1108 | return (0); |
1109 | case _PC_MAX_CANON: |
1110 | *ap->a_retval = MAX_CANON; |
1111 | return (0); |
1112 | case _PC_MAX_INPUT: |
1113 | *ap->a_retval = MAX_INPUT; |
1114 | return (0); |
1115 | case _PC_PIPE_BUF: |
1116 | *ap->a_retval = PIPE_BUF; |
1117 | return (0); |
1118 | case _PC_CHOWN_RESTRICTED: |
1119 | *ap->a_retval = 1; |
1120 | return (0); |
1121 | case _PC_VDISABLE: |
1122 | *ap->a_retval = _POSIX_VDISABLE; |
1123 | return (0); |
1124 | case _PC_SYNC_IO: |
1125 | *ap->a_retval = 1; |
1126 | return (0); |
1127 | default: |
1128 | return (EINVAL); |
1129 | } |
1130 | /* NOTREACHED */ |
1131 | } |
1132 | |
1133 | /* |
1134 | * Print out the contents of a /dev/fd vnode. |
1135 | */ |
1136 | /* ARGSUSED */ |
1137 | int |
1138 | kernfs_print(void *v) |
1139 | { |
1140 | |
1141 | printf("tag VT_KERNFS, kernfs vnode\n" ); |
1142 | return (0); |
1143 | } |
1144 | |
1145 | int |
1146 | kernfs_link(void *v) |
1147 | { |
1148 | struct vop_link_v2_args /* { |
1149 | struct vnode *a_dvp; |
1150 | struct vnode *a_vp; |
1151 | struct componentname *a_cnp; |
1152 | } */ *ap = v; |
1153 | |
1154 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
1155 | return (EROFS); |
1156 | } |
1157 | |
1158 | int |
1159 | kernfs_symlink(void *v) |
1160 | { |
1161 | struct vop_symlink_v3_args /* { |
1162 | struct vnode *a_dvp; |
1163 | struct vnode **a_vpp; |
1164 | struct componentname *a_cnp; |
1165 | struct vattr *a_vap; |
1166 | char *a_target; |
1167 | } */ *ap = v; |
1168 | |
1169 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
1170 | return (EROFS); |
1171 | } |
1172 | |