| 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 | |