Annotation of src/sys/miscfs/kernfs/kernfs_vnops.c, Revision 1.81
1.81 ! lukem 1: /* $NetBSD: kernfs_vnops.c,v 1.80 2002/07/05 02:02:00 lukem Exp $ */
1.27 cgd 2:
1.1 cgd 3: /*
1.23 mycroft 4: * Copyright (c) 1992, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
1.17 cgd 7: * This code is derived from software donated to Berkeley by
1.1 cgd 8: * Jan-Simon Pendry.
9: *
1.2 cgd 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. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
1.17 cgd 20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
1.2 cgd 22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
1.1 cgd 25: *
1.2 cgd 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
1.1 cgd 37: *
1.57 fvdl 38: * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
1.1 cgd 39: */
40:
41: /*
1.23 mycroft 42: * Kernel parameter filesystem (/kern)
1.1 cgd 43: */
1.77 lukem 44:
45: #include <sys/cdefs.h>
1.81 ! lukem 46: __KERNEL_RCSID(0, "$NetBSD: kernfs_vnops.c,v 1.80 2002/07/05 02:02:00 lukem Exp $");
1.55 mrg 47:
1.14 mycroft 48: #include <sys/param.h>
49: #include <sys/systm.h>
50: #include <sys/kernel.h>
1.23 mycroft 51: #include <sys/vmmeter.h>
1.14 mycroft 52: #include <sys/time.h>
53: #include <sys/proc.h>
1.23 mycroft 54: #include <sys/vnode.h>
55: #include <sys/malloc.h>
1.14 mycroft 56: #include <sys/file.h>
57: #include <sys/stat.h>
58: #include <sys/mount.h>
59: #include <sys/namei.h>
60: #include <sys/buf.h>
1.23 mycroft 61: #include <sys/dirent.h>
1.28 mycroft 62: #include <sys/msgbuf.h>
1.44 mycroft 63:
64: #include <miscfs/genfs/genfs.h>
1.17 cgd 65: #include <miscfs/kernfs/kernfs.h>
1.63 mrg 66:
1.54 mrg 67: #include <uvm/uvm_extern.h>
68:
1.17 cgd 69: #define KSTRING 256 /* Largest I/O available via this filesystem */
70: #define UIO_MX 32
1.1 cgd 71:
1.23 mycroft 72: #define READ_MODE (S_IRUSR|S_IRGRP|S_IROTH)
73: #define WRITE_MODE (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH)
74: #define DIR_MODE (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
75:
1.75 jdolecek 76: const struct kern_target kern_targets[] = {
1.1 cgd 77: /* NOTE: The name must be less than UIO_MX-16 chars in length */
1.23 mycroft 78: #define N(s) sizeof(s)-1, s
79: /* name data tag type ro/rw */
80: { DT_DIR, N("."), 0, KTT_NULL, VDIR, DIR_MODE },
81: { DT_DIR, N(".."), 0, KTT_NULL, VDIR, DIR_MODE },
82: { DT_REG, N("boottime"), &boottime.tv_sec, KTT_INT, VREG, READ_MODE },
1.69 thorpej 83: /* XXX cast away const */
84: { DT_REG, N("copyright"), (void *)copyright,
85: KTT_STRING, VREG, READ_MODE },
1.23 mycroft 86: { DT_REG, N("hostname"), 0, KTT_HOSTNAME, VREG, WRITE_MODE },
87: { DT_REG, N("hz"), &hz, KTT_INT, VREG, READ_MODE },
88: { DT_REG, N("loadavg"), 0, KTT_AVENRUN, VREG, READ_MODE },
1.28 mycroft 89: { DT_REG, N("msgbuf"), 0, KTT_MSGBUF, VREG, READ_MODE },
1.54 mrg 90: { DT_REG, N("pagesize"), &uvmexp.pagesize, KTT_INT, VREG, READ_MODE },
1.73 jdolecek 91: { DT_REG, N("physmem"), &physmem, KTT_INT, VREG, READ_MODE },
1.17 cgd 92: #if 0
1.23 mycroft 93: { DT_DIR, N("root"), 0, KTT_NULL, VDIR, DIR_MODE },
1.17 cgd 94: #endif
1.23 mycroft 95: { DT_BLK, N("rootdev"), &rootdev, KTT_DEVICE, VBLK, READ_MODE },
96: { DT_CHR, N("rrootdev"), &rrootdev, KTT_DEVICE, VCHR, READ_MODE },
97: { DT_REG, N("time"), 0, KTT_TIME, VREG, READ_MODE },
1.69 thorpej 98: /* XXX cast away const */
99: { DT_REG, N("version"), (void *)version,
100: KTT_STRING, VREG, READ_MODE },
1.23 mycroft 101: #undef N
1.1 cgd 102: };
1.17 cgd 103: static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]);
1.1 cgd 104:
1.41 christos 105: int kernfs_lookup __P((void *));
1.64 wrstuden 106: #define kernfs_create genfs_eopnotsupp_rele
107: #define kernfs_mknod genfs_eopnotsupp_rele
1.44 mycroft 108: #define kernfs_open genfs_nullop
109: #define kernfs_close genfs_nullop
1.41 christos 110: int kernfs_access __P((void *));
111: int kernfs_getattr __P((void *));
112: int kernfs_setattr __P((void *));
113: int kernfs_read __P((void *));
114: int kernfs_write __P((void *));
1.65 wrstuden 115: #define kernfs_fcntl genfs_fcntl
1.61 matthias 116: #define kernfs_ioctl genfs_enoioctl
1.45 mycroft 117: #define kernfs_poll genfs_poll
1.57 fvdl 118: #define kernfs_revoke genfs_revoke
1.44 mycroft 119: #define kernfs_fsync genfs_nullop
120: #define kernfs_seek genfs_nullop
1.64 wrstuden 121: #define kernfs_remove genfs_eopnotsupp_rele
1.41 christos 122: int kernfs_link __P((void *));
1.64 wrstuden 123: #define kernfs_rename genfs_eopnotsupp_rele
124: #define kernfs_mkdir genfs_eopnotsupp_rele
125: #define kernfs_rmdir genfs_eopnotsupp_rele
1.41 christos 126: int kernfs_symlink __P((void *));
127: int kernfs_readdir __P((void *));
1.44 mycroft 128: #define kernfs_readlink genfs_eopnotsupp
129: #define kernfs_abortop genfs_abortop
1.41 christos 130: int kernfs_inactive __P((void *));
131: int kernfs_reclaim __P((void *));
1.64 wrstuden 132: #define kernfs_lock genfs_lock
133: #define kernfs_unlock genfs_unlock
1.44 mycroft 134: #define kernfs_bmap genfs_badop
135: #define kernfs_strategy genfs_badop
1.41 christos 136: int kernfs_print __P((void *));
1.64 wrstuden 137: #define kernfs_islocked genfs_islocked
1.41 christos 138: int kernfs_pathconf __P((void *));
1.62 kleink 139: #define kernfs_advlock genfs_einval
1.44 mycroft 140: #define kernfs_blkatoff genfs_eopnotsupp
141: #define kernfs_valloc genfs_eopnotsupp
142: #define kernfs_vfree genfs_nullop
143: #define kernfs_truncate genfs_eopnotsupp
144: #define kernfs_update genfs_nullop
145: #define kernfs_bwrite genfs_eopnotsupp
1.79 chs 146: #define kernfs_putpages genfs_putpages
1.41 christos 147:
1.75 jdolecek 148: int kernfs_xread __P((const struct kern_target *, int, char **, int));
149: int kernfs_xwrite __P((const struct kern_target *, char *, int));
1.41 christos 150:
151: int (**kernfs_vnodeop_p) __P((void *));
1.71 jdolecek 152: const struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = {
1.41 christos 153: { &vop_default_desc, vn_default_error },
1.44 mycroft 154: { &vop_lookup_desc, kernfs_lookup }, /* lookup */
155: { &vop_create_desc, kernfs_create }, /* create */
156: { &vop_mknod_desc, kernfs_mknod }, /* mknod */
157: { &vop_open_desc, kernfs_open }, /* open */
158: { &vop_close_desc, kernfs_close }, /* close */
159: { &vop_access_desc, kernfs_access }, /* access */
160: { &vop_getattr_desc, kernfs_getattr }, /* getattr */
161: { &vop_setattr_desc, kernfs_setattr }, /* setattr */
162: { &vop_read_desc, kernfs_read }, /* read */
163: { &vop_write_desc, kernfs_write }, /* write */
1.65 wrstuden 164: { &vop_fcntl_desc, kernfs_fcntl }, /* fcntl */
1.44 mycroft 165: { &vop_ioctl_desc, kernfs_ioctl }, /* ioctl */
1.45 mycroft 166: { &vop_poll_desc, kernfs_poll }, /* poll */
1.57 fvdl 167: { &vop_revoke_desc, kernfs_revoke }, /* revoke */
1.44 mycroft 168: { &vop_fsync_desc, kernfs_fsync }, /* fsync */
169: { &vop_seek_desc, kernfs_seek }, /* seek */
170: { &vop_remove_desc, kernfs_remove }, /* remove */
171: { &vop_link_desc, kernfs_link }, /* link */
172: { &vop_rename_desc, kernfs_rename }, /* rename */
173: { &vop_mkdir_desc, kernfs_mkdir }, /* mkdir */
174: { &vop_rmdir_desc, kernfs_rmdir }, /* rmdir */
175: { &vop_symlink_desc, kernfs_symlink }, /* symlink */
176: { &vop_readdir_desc, kernfs_readdir }, /* readdir */
177: { &vop_readlink_desc, kernfs_readlink }, /* readlink */
178: { &vop_abortop_desc, kernfs_abortop }, /* abortop */
179: { &vop_inactive_desc, kernfs_inactive }, /* inactive */
180: { &vop_reclaim_desc, kernfs_reclaim }, /* reclaim */
181: { &vop_lock_desc, kernfs_lock }, /* lock */
182: { &vop_unlock_desc, kernfs_unlock }, /* unlock */
183: { &vop_bmap_desc, kernfs_bmap }, /* bmap */
184: { &vop_strategy_desc, kernfs_strategy }, /* strategy */
185: { &vop_print_desc, kernfs_print }, /* print */
186: { &vop_islocked_desc, kernfs_islocked }, /* islocked */
187: { &vop_pathconf_desc, kernfs_pathconf }, /* pathconf */
188: { &vop_advlock_desc, kernfs_advlock }, /* advlock */
189: { &vop_blkatoff_desc, kernfs_blkatoff }, /* blkatoff */
190: { &vop_valloc_desc, kernfs_valloc }, /* valloc */
191: { &vop_vfree_desc, kernfs_vfree }, /* vfree */
192: { &vop_truncate_desc, kernfs_truncate }, /* truncate */
193: { &vop_update_desc, kernfs_update }, /* update */
194: { &vop_bwrite_desc, kernfs_bwrite }, /* bwrite */
1.79 chs 195: { &vop_putpages_desc, kernfs_putpages }, /* putpages */
1.76 chs 196: { NULL, NULL }
1.41 christos 197: };
1.71 jdolecek 198: const struct vnodeopv_desc kernfs_vnodeop_opv_desc =
1.41 christos 199: { &kernfs_vnodeop_p, kernfs_vnodeop_entries };
200:
1.28 mycroft 201: int
202: kernfs_xread(kt, off, bufp, len)
1.75 jdolecek 203: const struct kern_target *kt;
1.28 mycroft 204: int off;
205: char **bufp;
1.1 cgd 206: int len;
207: {
208:
209: switch (kt->kt_tag) {
210: case KTT_TIME: {
211: struct timeval tv;
1.28 mycroft 212:
1.1 cgd 213: microtime(&tv);
1.47 christos 214: sprintf(*bufp, "%ld %ld\n", tv.tv_sec, tv.tv_usec);
1.1 cgd 215: break;
216: }
217:
218: case KTT_INT: {
219: int *ip = kt->kt_data;
1.28 mycroft 220:
1.47 christos 221: sprintf(*bufp, "%d\n", *ip);
1.1 cgd 222: break;
223: }
224:
225: case KTT_STRING: {
226: char *cp = kt->kt_data;
227:
1.28 mycroft 228: *bufp = cp;
229: break;
230: }
1.1 cgd 231:
1.28 mycroft 232: case KTT_MSGBUF: {
233: long n;
234:
1.52 leo 235: /*
236: * deal with cases where the message buffer has
237: * become corrupted.
238: */
239: if (!msgbufenabled || msgbufp->msg_magic != MSG_MAGIC) {
240: msgbufenabled = 0;
241: return (ENXIO);
242: }
243:
244: /*
245: * Note that reads of /kern/msgbuf won't necessarily yield
246: * consistent results, if the message buffer is modified
247: * while the read is in progress. The worst that can happen
248: * is that incorrect data will be read. There's no way
249: * that this can crash the system unless the values in the
250: * message buffer header are corrupted, but that'll cause
251: * the system to die anyway.
252: */
253: if (off >= msgbufp->msg_bufs)
1.28 mycroft 254: return (0);
255: n = msgbufp->msg_bufx + off;
1.52 leo 256: if (n >= msgbufp->msg_bufs)
257: n -= msgbufp->msg_bufs;
258: len = min(msgbufp->msg_bufs - n, msgbufp->msg_bufs - off);
1.28 mycroft 259: *bufp = msgbufp->msg_bufc + n;
260: return (len);
1.1 cgd 261: }
262:
263: case KTT_HOSTNAME: {
264: char *cp = hostname;
265: int xlen = hostnamelen;
266:
1.17 cgd 267: if (xlen >= (len-2))
1.1 cgd 268: return (EINVAL);
269:
1.60 perry 270: memcpy(*bufp, cp, xlen);
1.28 mycroft 271: (*bufp)[xlen] = '\n';
272: (*bufp)[xlen+1] = '\0';
1.1 cgd 273: break;
274: }
275:
276: case KTT_AVENRUN:
1.31 mycroft 277: averunnable.fscale = FSCALE;
1.47 christos 278: sprintf(*bufp, "%d %d %d %ld\n",
1.23 mycroft 279: averunnable.ldavg[0], averunnable.ldavg[1],
280: averunnable.ldavg[2], averunnable.fscale);
1.1 cgd 281: break;
282:
283: default:
1.28 mycroft 284: return (0);
1.1 cgd 285: }
286:
1.28 mycroft 287: len = strlen(*bufp);
288: if (len <= off)
289: return (0);
290: *bufp += off;
291: return (len - off);
1.1 cgd 292: }
293:
1.28 mycroft 294: int
1.1 cgd 295: kernfs_xwrite(kt, buf, len)
1.75 jdolecek 296: const struct kern_target *kt;
1.1 cgd 297: char *buf;
298: int len;
299: {
1.23 mycroft 300:
1.1 cgd 301: switch (kt->kt_tag) {
1.23 mycroft 302: case KTT_HOSTNAME:
1.1 cgd 303: if (buf[len-1] == '\n')
304: --len;
1.60 perry 305: memcpy(hostname, buf, len);
1.17 cgd 306: hostname[len] = '\0';
1.6 cgd 307: hostnamelen = len;
1.1 cgd 308: return (0);
309:
310: default:
311: return (EIO);
312: }
313: }
314:
1.17 cgd 315:
316: /*
1.1 cgd 317: * vp is the current namei directory
318: * ndp is the name to locate in that directory...
319: */
1.41 christos 320: int
321: kernfs_lookup(v)
322: void *v;
323: {
1.23 mycroft 324: struct vop_lookup_args /* {
325: struct vnode * a_dvp;
326: struct vnode ** a_vpp;
327: struct componentname * a_cnp;
1.41 christos 328: } */ *ap = v;
1.23 mycroft 329: struct componentname *cnp = ap->a_cnp;
330: struct vnode **vpp = ap->a_vpp;
331: struct vnode *dvp = ap->a_dvp;
1.48 cgd 332: const char *pname = cnp->cn_nameptr;
1.75 jdolecek 333: const struct kern_target *kt;
1.1 cgd 334: struct vnode *fvp;
1.64 wrstuden 335: int error, i, wantpunlock;
1.1 cgd 336:
337: #ifdef KERNFS_DIAGNOSTIC
1.51 christos 338: printf("kernfs_lookup(%p)\n", ap);
339: printf("kernfs_lookup(dp = %p, vpp = %p, cnp = %p)\n", dvp, vpp, ap->a_cnp);
1.47 christos 340: printf("kernfs_lookup(%s)\n", pname);
1.1 cgd 341: #endif
1.23 mycroft 342:
1.35 mycroft 343: *vpp = NULLVP;
1.64 wrstuden 344: cnp->cn_flags &= ~PDIRUNLOCK;
1.35 mycroft 345:
346: if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
347: return (EROFS);
348:
1.23 mycroft 349: if (cnp->cn_namelen == 1 && *pname == '.') {
350: *vpp = dvp;
1.1 cgd 351: VREF(dvp);
352: return (0);
353: }
1.13 cgd 354:
1.64 wrstuden 355: /*
356: * This code only supports a flat directory, so we don't
357: * need to worry about ..
358: */
359:
1.17 cgd 360: #if 0
1.60 perry 361: if (cnp->cn_namelen == 4 && memcmp(pname, "root", 4) == 0) {
1.23 mycroft 362: *vpp = rootdir;
1.17 cgd 363: VREF(rootdir);
1.57 fvdl 364: vn_lock(rootdir, LK_SHARED | LK_RETRY);
1.1 cgd 365: return (0);
366: }
1.13 cgd 367: #endif
1.25 mycroft 368:
1.64 wrstuden 369: wantpunlock = (~cnp->cn_flags & (LOCKPARENT | ISLASTCN));
370:
1.35 mycroft 371: for (kt = kern_targets, i = 0; i < nkern_targets; kt++, i++) {
1.26 mycroft 372: if (cnp->cn_namelen == kt->kt_namlen &&
1.60 perry 373: memcmp(kt->kt_name, pname, cnp->cn_namelen) == 0)
1.35 mycroft 374: goto found;
1.1 cgd 375: }
376:
377: #ifdef KERNFS_DIAGNOSTIC
1.47 christos 378: printf("kernfs_lookup: i = %d, failed", i);
1.1 cgd 379: #endif
380:
1.35 mycroft 381: return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);
1.23 mycroft 382:
1.35 mycroft 383: found:
1.23 mycroft 384: if (kt->kt_tag == KTT_DEVICE) {
385: dev_t *dp = kt->kt_data;
1.24 mycroft 386: loop:
1.57 fvdl 387: if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp)) {
1.24 mycroft 388: return (ENOENT);
1.57 fvdl 389: }
1.23 mycroft 390: *vpp = fvp;
1.57 fvdl 391: if (vget(fvp, LK_EXCLUSIVE))
1.24 mycroft 392: goto loop;
1.64 wrstuden 393: if (wantpunlock) {
394: VOP_UNLOCK(dvp, 0);
395: cnp->cn_flags |= PDIRUNLOCK;
396: }
1.23 mycroft 397: return (0);
398: }
1.1 cgd 399:
400: #ifdef KERNFS_DIAGNOSTIC
1.47 christos 401: printf("kernfs_lookup: allocate new vnode\n");
1.1 cgd 402: #endif
1.41 christos 403: error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p, &fvp);
1.57 fvdl 404: if (error) {
1.23 mycroft 405: return (error);
1.57 fvdl 406: }
1.23 mycroft 407:
408: MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP,
409: M_WAITOK);
410: VTOKERN(fvp)->kf_kt = kt;
411: fvp->v_type = kt->kt_vtype;
1.64 wrstuden 412: vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY);
1.23 mycroft 413: *vpp = fvp;
414:
1.1 cgd 415: #ifdef KERNFS_DIAGNOSTIC
1.51 christos 416: printf("kernfs_lookup: newvp = %p\n", fvp);
1.1 cgd 417: #endif
1.64 wrstuden 418: if (wantpunlock) {
419: VOP_UNLOCK(dvp, 0);
420: cnp->cn_flags |= PDIRUNLOCK;
421: }
1.1 cgd 422: return (0);
423: }
424:
1.28 mycroft 425: int
1.41 christos 426: kernfs_access(v)
427: void *v;
428: {
1.23 mycroft 429: struct vop_access_args /* {
430: struct vnode *a_vp;
1.34 mycroft 431: int a_mode;
1.23 mycroft 432: struct ucred *a_cred;
433: struct proc *a_p;
1.41 christos 434: } */ *ap = v;
1.26 mycroft 435: struct vnode *vp = ap->a_vp;
1.49 mycroft 436: mode_t mode;
1.17 cgd 437:
1.49 mycroft 438: if (vp->v_flag & VROOT) {
439: mode = DIR_MODE;
440: } else {
1.75 jdolecek 441: const struct kern_target *kt = VTOKERN(vp)->kf_kt;
1.49 mycroft 442: mode = kt->kt_mode;
443: }
444:
445: return (vaccess(vp->v_type, mode, (uid_t)0, (gid_t)0, ap->a_mode,
446: ap->a_cred));
1.23 mycroft 447: }
448:
1.41 christos 449: int
450: kernfs_getattr(v)
451: void *v;
452: {
1.23 mycroft 453: struct vop_getattr_args /* {
454: struct vnode *a_vp;
455: struct vattr *a_vap;
456: struct ucred *a_cred;
457: struct proc *a_p;
1.41 christos 458: } */ *ap = v;
1.23 mycroft 459: struct vnode *vp = ap->a_vp;
460: struct vattr *vap = ap->a_vap;
1.36 cgd 461: struct timeval tv;
1.1 cgd 462: int error = 0;
1.28 mycroft 463: char strbuf[KSTRING], *buf;
1.1 cgd 464:
1.60 perry 465: memset((caddr_t) vap, 0, sizeof(*vap));
1.1 cgd 466: vattr_null(vap);
1.17 cgd 467: vap->va_uid = 0;
468: vap->va_gid = 0;
1.1 cgd 469: vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1.23 mycroft 470: vap->va_size = 0;
1.1 cgd 471: vap->va_blocksize = DEV_BSIZE;
1.81 ! lukem 472: /*
! 473: * Make all times be current TOD.
! 474: */
1.36 cgd 475: microtime(&tv);
1.81 ! lukem 476: TIMEVAL_TO_TIMESPEC(&tv, &vap->va_ctime);
! 477: vap->va_atime = vap->va_mtime = vap->va_ctime;
1.1 cgd 478: vap->va_gen = 0;
479: vap->va_flags = 0;
480: vap->va_rdev = 0;
481: vap->va_bytes = 0;
482:
483: if (vp->v_flag & VROOT) {
484: #ifdef KERNFS_DIAGNOSTIC
1.47 christos 485: printf("kernfs_getattr: stat rootdir\n");
1.1 cgd 486: #endif
1.17 cgd 487: vap->va_type = VDIR;
1.23 mycroft 488: vap->va_mode = DIR_MODE;
1.1 cgd 489: vap->va_nlink = 2;
490: vap->va_fileid = 2;
491: vap->va_size = DEV_BSIZE;
492: } else {
1.75 jdolecek 493: const struct kern_target *kt = VTOKERN(vp)->kf_kt;
1.28 mycroft 494: int nbytes, total;
1.1 cgd 495: #ifdef KERNFS_DIAGNOSTIC
1.47 christos 496: printf("kernfs_getattr: stat target %s\n", kt->kt_name);
1.1 cgd 497: #endif
1.17 cgd 498: vap->va_type = kt->kt_vtype;
1.23 mycroft 499: vap->va_mode = kt->kt_mode;
1.1 cgd 500: vap->va_nlink = 1;
1.57 fvdl 501: vap->va_fileid = 1 + (kt - kern_targets);
1.28 mycroft 502: total = 0;
503: while (buf = strbuf,
504: nbytes = kernfs_xread(kt, total, &buf, sizeof(strbuf)))
505: total += nbytes;
506: vap->va_size = total;
1.1 cgd 507: }
508:
509: #ifdef KERNFS_DIAGNOSTIC
1.47 christos 510: printf("kernfs_getattr: return error %d\n", error);
1.1 cgd 511: #endif
512: return (error);
513: }
514:
1.41 christos 515: /*ARGSUSED*/
516: int
517: kernfs_setattr(v)
518: void *v;
1.1 cgd 519: {
520: /*
1.17 cgd 521: * Silently ignore attribute changes.
522: * This allows for open with truncate to have no
523: * effect until some data is written. I want to
524: * do it this way because all writes are atomic.
1.1 cgd 525: */
1.17 cgd 526: return (0);
1.1 cgd 527: }
528:
1.28 mycroft 529: int
1.41 christos 530: kernfs_read(v)
531: void *v;
532: {
1.23 mycroft 533: struct vop_read_args /* {
534: struct vnode *a_vp;
535: struct uio *a_uio;
536: int a_ioflag;
537: struct ucred *a_cred;
1.41 christos 538: } */ *ap = v;
1.23 mycroft 539: struct vnode *vp = ap->a_vp;
540: struct uio *uio = ap->a_uio;
1.75 jdolecek 541: const struct kern_target *kt;
1.28 mycroft 542: char strbuf[KSTRING], *buf;
543: int off, len;
544: int error;
1.23 mycroft 545:
546: if (vp->v_type == VDIR)
547: return (EOPNOTSUPP);
548:
549: kt = VTOKERN(vp)->kf_kt;
550:
1.1 cgd 551: #ifdef KERNFS_DIAGNOSTIC
1.47 christos 552: printf("kern_read %s\n", kt->kt_name);
1.1 cgd 553: #endif
1.18 cgd 554:
1.28 mycroft 555: off = uio->uio_offset;
556: #if 0
557: while (buf = strbuf,
558: #else
559: if (buf = strbuf,
560: #endif
561: len = kernfs_xread(kt, off, &buf, sizeof(strbuf))) {
1.41 christos 562: if ((error = uiomove(buf, len, uio)) != 0)
1.28 mycroft 563: return (error);
564: off += len;
565: }
566: return (0);
1.1 cgd 567: }
568:
1.28 mycroft 569: int
1.41 christos 570: kernfs_write(v)
571: void *v;
572: {
1.23 mycroft 573: struct vop_write_args /* {
574: struct vnode *a_vp;
575: struct uio *a_uio;
576: int a_ioflag;
577: struct ucred *a_cred;
1.41 christos 578: } */ *ap = v;
1.23 mycroft 579: struct vnode *vp = ap->a_vp;
580: struct uio *uio = ap->a_uio;
1.75 jdolecek 581: const struct kern_target *kt;
1.23 mycroft 582: int error, xlen;
1.1 cgd 583: char strbuf[KSTRING];
1.23 mycroft 584:
585: if (vp->v_type == VDIR)
586: return (EOPNOTSUPP);
587:
588: kt = VTOKERN(vp)->kf_kt;
1.1 cgd 589:
590: if (uio->uio_offset != 0)
591: return (EINVAL);
592:
593: xlen = min(uio->uio_resid, KSTRING-1);
1.41 christos 594: if ((error = uiomove(strbuf, xlen, uio)) != 0)
1.1 cgd 595: return (error);
596:
597: if (uio->uio_resid != 0)
598: return (EIO);
599:
600: strbuf[xlen] = '\0';
1.17 cgd 601: xlen = strlen(strbuf);
1.1 cgd 602: return (kernfs_xwrite(kt, strbuf, xlen));
603: }
604:
1.41 christos 605: int
606: kernfs_readdir(v)
607: void *v;
608: {
1.23 mycroft 609: struct vop_readdir_args /* {
610: struct vnode *a_vp;
611: struct uio *a_uio;
612: struct ucred *a_cred;
1.26 mycroft 613: int *a_eofflag;
1.57 fvdl 614: off_t **a_cookies;
615: int a_*ncookies;
1.41 christos 616: } */ *ap = v;
1.23 mycroft 617: struct uio *uio = ap->a_uio;
1.37 mycroft 618: struct dirent d;
1.75 jdolecek 619: const struct kern_target *kt;
1.67 sommerfe 620: off_t i;
1.1 cgd 621: int error;
1.57 fvdl 622: off_t *cookies = NULL;
623: int ncookies = 0, nc = 0;
1.1 cgd 624:
1.23 mycroft 625: if (ap->a_vp->v_type != VDIR)
626: return (ENOTDIR);
627:
1.37 mycroft 628: if (uio->uio_resid < UIO_MX)
629: return (EINVAL);
1.38 mycroft 630: if (uio->uio_offset < 0)
1.37 mycroft 631: return (EINVAL);
1.26 mycroft 632:
1.1 cgd 633: error = 0;
1.38 mycroft 634: i = uio->uio_offset;
1.66 sommerfe 635:
636: if (i >= nkern_targets)
637: return 0;
638:
1.60 perry 639: memset((caddr_t)&d, 0, UIO_MX);
1.37 mycroft 640: d.d_reclen = UIO_MX;
641:
1.57 fvdl 642: if (ap->a_ncookies) {
643: nc = uio->uio_resid / UIO_MX;
644: nc = min(nc, (nkern_targets - i));
1.70 thorpej 645: cookies = malloc(nc * sizeof(off_t), M_TEMP, M_WAITOK);
1.57 fvdl 646: *ap->a_cookies = cookies;
647: }
648:
1.23 mycroft 649: for (kt = &kern_targets[i];
650: uio->uio_resid >= UIO_MX && i < nkern_targets; kt++, i++) {
1.1 cgd 651: #ifdef KERNFS_DIAGNOSTIC
1.74 mrg 652: printf("kernfs_readdir: i = %d\n", (int)i);
1.1 cgd 653: #endif
1.26 mycroft 654:
1.23 mycroft 655: if (kt->kt_tag == KTT_DEVICE) {
1.26 mycroft 656: dev_t *dp = kt->kt_data;
1.23 mycroft 657: struct vnode *fvp;
1.26 mycroft 658:
1.23 mycroft 659: if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp))
660: continue;
661: }
1.26 mycroft 662:
1.37 mycroft 663: d.d_fileno = i + 3;
664: d.d_namlen = kt->kt_namlen;
1.60 perry 665: memcpy(d.d_name, kt->kt_name, kt->kt_namlen + 1);
1.37 mycroft 666: d.d_type = kt->kt_type;
1.26 mycroft 667:
1.41 christos 668: if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0)
1.1 cgd 669: break;
1.57 fvdl 670: if (cookies) {
1.38 mycroft 671: *cookies++ = i + 1;
1.57 fvdl 672: ncookies++;
673: }
674: }
675:
676: if (ap->a_ncookies) {
677: if (error) {
1.70 thorpej 678: free(*ap->a_cookies, M_TEMP);
1.57 fvdl 679: *ap->a_ncookies = 0;
680: *ap->a_cookies = NULL;
681: } else
682: *ap->a_ncookies = ncookies;
1.1 cgd 683: }
684:
1.38 mycroft 685: uio->uio_offset = i;
1.1 cgd 686: return (error);
687: }
688:
1.41 christos 689: int
690: kernfs_inactive(v)
691: void *v;
692: {
1.23 mycroft 693: struct vop_inactive_args /* {
694: struct vnode *a_vp;
1.57 fvdl 695: struct proc *a_p;
1.41 christos 696: } */ *ap = v;
1.23 mycroft 697: struct vnode *vp = ap->a_vp;
698:
699: #ifdef KERNFS_DIAGNOSTIC
1.51 christos 700: printf("kernfs_inactive(%p)\n", vp);
1.23 mycroft 701: #endif
1.1 cgd 702: /*
703: * Clear out the v_type field to avoid
704: * nasty things happening in vgone().
705: */
1.57 fvdl 706: VOP_UNLOCK(vp, 0);
1.1 cgd 707: vp->v_type = VNON;
1.23 mycroft 708: return (0);
709: }
710:
1.41 christos 711: int
712: kernfs_reclaim(v)
713: void *v;
714: {
1.23 mycroft 715: struct vop_reclaim_args /* {
716: struct vnode *a_vp;
1.41 christos 717: } */ *ap = v;
1.23 mycroft 718: struct vnode *vp = ap->a_vp;
719:
1.1 cgd 720: #ifdef KERNFS_DIAGNOSTIC
1.51 christos 721: printf("kernfs_reclaim(%p)\n", vp);
1.1 cgd 722: #endif
1.23 mycroft 723: if (vp->v_data) {
724: FREE(vp->v_data, M_TEMP);
725: vp->v_data = 0;
726: }
1.1 cgd 727: return (0);
728: }
729:
730: /*
1.23 mycroft 731: * Return POSIX pathconf information applicable to special devices.
732: */
1.41 christos 733: int
734: kernfs_pathconf(v)
735: void *v;
736: {
1.23 mycroft 737: struct vop_pathconf_args /* {
738: struct vnode *a_vp;
739: int a_name;
1.29 cgd 740: register_t *a_retval;
1.41 christos 741: } */ *ap = v;
1.23 mycroft 742:
743: switch (ap->a_name) {
744: case _PC_LINK_MAX:
745: *ap->a_retval = LINK_MAX;
746: return (0);
747: case _PC_MAX_CANON:
748: *ap->a_retval = MAX_CANON;
749: return (0);
750: case _PC_MAX_INPUT:
751: *ap->a_retval = MAX_INPUT;
752: return (0);
753: case _PC_PIPE_BUF:
754: *ap->a_retval = PIPE_BUF;
755: return (0);
756: case _PC_CHOWN_RESTRICTED:
757: *ap->a_retval = 1;
758: return (0);
759: case _PC_VDISABLE:
760: *ap->a_retval = _POSIX_VDISABLE;
1.59 kleink 761: return (0);
762: case _PC_SYNC_IO:
763: *ap->a_retval = 1;
1.23 mycroft 764: return (0);
765: default:
766: return (EINVAL);
767: }
768: /* NOTREACHED */
769: }
770:
771: /*
772: * Print out the contents of a /dev/fd vnode.
1.1 cgd 773: */
774: /* ARGSUSED */
1.41 christos 775: int
776: kernfs_print(v)
777: void *v;
1.23 mycroft 778: {
779:
1.47 christos 780: printf("tag VT_KERNFS, kernfs vnode\n");
1.23 mycroft 781: return (0);
782: }
783:
1.40 mycroft 784: int
1.41 christos 785: kernfs_link(v)
786: void *v;
787: {
1.40 mycroft 788: struct vop_link_args /* {
789: struct vnode *a_dvp;
790: struct vnode *a_vp;
791: struct componentname *a_cnp;
1.41 christos 792: } */ *ap = v;
1.40 mycroft 793:
794: VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
795: vput(ap->a_dvp);
796: return (EROFS);
797: }
798:
799: int
1.41 christos 800: kernfs_symlink(v)
801: void *v;
802: {
1.40 mycroft 803: struct vop_symlink_args /* {
804: struct vnode *a_dvp;
805: struct vnode **a_vpp;
806: struct componentname *a_cnp;
807: struct vattr *a_vap;
808: char *a_target;
1.41 christos 809: } */ *ap = v;
1.40 mycroft 810:
811: VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
812: vput(ap->a_dvp);
813: return (EROFS);
1.1 cgd 814: }
CVSweb <webmaster@jp.NetBSD.org>