Annotation of src/sys/miscfs/kernfs/kernfs_vfsops.c, Revision 1.88
1.88 ! dsl 1: /* $NetBSD: kernfs_vfsops.c,v 1.87 2008/12/17 20:51:36 cegger Exp $ */
1.18 cgd 2:
1.1 cgd 3: /*
1.32 fvdl 4: * Copyright (c) 1992, 1993, 1995
1.15 mycroft 5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
1.11 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.
1.53 agc 18: * 3. Neither the name of the University nor the names of its contributors
1.2 cgd 19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
1.1 cgd 21: *
1.2 cgd 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.
1.1 cgd 33: *
1.32 fvdl 34: * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
1.1 cgd 35: */
36:
37: /*
38: * Kernel params Filesystem
39: */
1.42 lukem 40:
41: #include <sys/cdefs.h>
1.88 ! dsl 42: __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.87 2008/12/17 20:51:36 cegger Exp $");
1.33 jonathan 43:
1.54 itojun 44: #ifdef _KERNEL_OPT
1.33 jonathan 45: #include "opt_compat_netbsd.h"
46: #endif
1.1 cgd 47:
1.9 mycroft 48: #include <sys/param.h>
49: #include <sys/systm.h>
1.57 atatat 50: #include <sys/sysctl.h>
1.15 mycroft 51: #include <sys/conf.h>
1.9 mycroft 52: #include <sys/proc.h>
53: #include <sys/vnode.h>
54: #include <sys/mount.h>
55: #include <sys/namei.h>
1.60 christos 56: #include <sys/dirent.h>
1.9 mycroft 57: #include <sys/malloc.h>
1.54 itojun 58: #include <sys/syslog.h>
1.71 elad 59: #include <sys/kauth.h>
1.85 rumble 60: #include <sys/module.h>
1.15 mycroft 61:
1.83 dholland 62: #include <miscfs/genfs/genfs.h>
1.15 mycroft 63: #include <miscfs/specfs/specdev.h>
1.9 mycroft 64: #include <miscfs/kernfs/kernfs.h>
1.1 cgd 65:
1.85 rumble 66: MODULE(MODULE_CLASS_VFS, kernfs, NULL);
67:
1.77 pooka 68: MALLOC_JUSTDEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
1.47 thorpej 69:
1.15 mycroft 70: dev_t rrootdev = NODEV;
71:
1.81 pooka 72: VFS_PROTOS(kernfs);
73:
1.68 xtraeme 74: void kernfs_get_rrootdev(void);
1.25 christos 75:
1.86 rumble 76: static struct sysctllog *kernfs_sysctl_log;
77:
1.25 christos 78: void
1.1 cgd 79: kernfs_init()
80: {
1.77 pooka 81:
1.49 christos 82: malloc_type_attach(M_KERNFSMNT);
1.54 itojun 83: kernfs_hashinit();
84: }
85:
86: void
87: kernfs_reinit()
88: {
89: kernfs_hashreinit();
1.10 cgd 90: }
91:
1.11 cgd 92: void
1.36 jdolecek 93: kernfs_done()
94: {
1.77 pooka 95:
96: kernfs_hashdone();
1.49 christos 97: malloc_type_detach(M_KERNFSMNT);
1.36 jdolecek 98: }
99:
100: void
1.15 mycroft 101: kernfs_get_rrootdev()
1.10 cgd 102: {
1.16 mycroft 103: static int tried = 0;
1.10 cgd 104:
1.16 mycroft 105: if (tried) {
1.15 mycroft 106: /* Already did it once. */
107: return;
108: }
1.16 mycroft 109: tried = 1;
110:
111: if (rootdev == NODEV)
112: return;
1.45 gehenna 113: rrootdev = devsw_blk2chr(rootdev);
1.54 itojun 114: if (rrootdev != NODEV)
1.45 gehenna 115: return;
1.16 mycroft 116: rrootdev = NODEV;
1.28 christos 117: printf("kernfs_get_rrootdev: no raw root device\n");
1.1 cgd 118: }
119:
120: /*
1.15 mycroft 121: * Mount the Kernel params filesystem
1.1 cgd 122: */
1.25 christos 123: int
1.82 pooka 124: kernfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
1.1 cgd 125: {
1.82 pooka 126: struct lwp *l = curlwp;
1.1 cgd 127: int error = 0;
128: struct kernfs_mount *fmp;
129:
1.54 itojun 130: if (UIO_MX & (UIO_MX - 1)) {
131: log(LOG_ERR, "kernfs: invalid directory entry size");
132: return (EINVAL);
133: }
1.1 cgd 134:
1.78 dsl 135: if (mp->mnt_flag & MNT_GETARGS) {
136: *data_len = 0;
1.46 christos 137: return 0;
1.78 dsl 138: }
1.1 cgd 139: /*
140: * Update is a no-op
141: */
142: if (mp->mnt_flag & MNT_UPDATE)
143: return (EOPNOTSUPP);
144:
1.87 cegger 145: fmp = malloc(sizeof(struct kernfs_mount), M_KERNFSMNT, M_WAITOK|M_ZERO);
1.54 itojun 146: TAILQ_INIT(&fmp->nodelist);
147:
1.65 jdolecek 148: mp->mnt_stat.f_namemax = MAXNAMLEN;
149: mp->mnt_flag |= MNT_LOCAL;
1.54 itojun 150: mp->mnt_data = fmp;
1.37 assar 151: vfs_getnewfsid(mp);
1.1 cgd 152:
1.64 tron 153: if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs",
1.79 pooka 154: UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l)) != 0) {
1.64 tron 155: free(fmp, M_KERNFSMNT);
156: return error;
157: }
1.10 cgd 158:
1.15 mycroft 159: kernfs_get_rrootdev();
1.64 tron 160: return 0;
1.1 cgd 161: }
162:
1.25 christos 163: int
1.82 pooka 164: kernfs_start(struct mount *mp, int flags)
1.1 cgd 165: {
1.15 mycroft 166:
1.1 cgd 167: return (0);
168: }
169:
1.25 christos 170: int
1.82 pooka 171: kernfs_unmount(struct mount *mp, int mntflags)
1.1 cgd 172: {
173: int error;
174: int flags = 0;
175:
1.54 itojun 176: if (mntflags & MNT_FORCE)
1.1 cgd 177: flags |= FORCECLOSE;
178:
1.54 itojun 179: if ((error = vflush(mp, 0, flags)) != 0)
1.1 cgd 180: return (error);
181:
182: /*
183: * Finally, throw away the kernfs_mount structure
184: */
1.47 thorpej 185: free(mp->mnt_data, M_KERNFSMNT);
1.64 tron 186: mp->mnt_data = NULL;
1.15 mycroft 187: return (0);
1.1 cgd 188: }
189:
1.25 christos 190: int
1.88 ! dsl 191: kernfs_root(struct mount *mp, struct vnode **vpp)
1.1 cgd 192: {
193:
1.54 itojun 194: /* setup "." */
1.56 darcy 195: return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0));
1.1 cgd 196: }
197:
1.25 christos 198: int
1.82 pooka 199: kernfs_statvfs(struct mount *mp, struct statvfs *sbp)
1.1 cgd 200: {
201:
202: sbp->f_bsize = DEV_BSIZE;
1.59 christos 203: sbp->f_frsize = DEV_BSIZE;
1.13 cgd 204: sbp->f_iosize = DEV_BSIZE;
1.1 cgd 205: sbp->f_blocks = 2; /* 1K to keep df happy */
206: sbp->f_bfree = 0;
207: sbp->f_bavail = 0;
1.59 christos 208: sbp->f_bresvd = 0;
1.54 itojun 209: sbp->f_files = 1024; /* XXX lie */
210: sbp->f_ffree = 128; /* XXX lie */
1.59 christos 211: sbp->f_favail = 128; /* XXX lie */
212: sbp->f_fresvd = 0;
213: copy_statvfs_info(sbp, mp);
1.1 cgd 214: return (0);
215: }
216:
1.25 christos 217: /*ARGSUSED*/
218: int
1.74 christos 219: kernfs_sync(struct mount *mp, int waitfor,
1.82 pooka 220: kauth_cred_t uc)
1.1 cgd 221: {
1.15 mycroft 222:
1.1 cgd 223: return (0);
224: }
225:
1.15 mycroft 226: /*
227: * Kernfs flat namespace lookup.
228: * Currently unsupported.
229: */
1.25 christos 230: int
1.74 christos 231: kernfs_vget(struct mount *mp, ino_t ino,
232: struct vnode **vpp)
1.15 mycroft 233: {
234:
235: return (EOPNOTSUPP);
236: }
237:
1.38 jdolecek 238: extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;
1.31 thorpej 239:
1.38 jdolecek 240: const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
1.31 thorpej 241: &kernfs_vnodeop_opv_desc,
242: NULL,
243: };
244:
1.1 cgd 245: struct vfsops kernfs_vfsops = {
1.12 cgd 246: MOUNT_KERNFS,
1.78 dsl 247: 0,
1.1 cgd 248: kernfs_mount,
249: kernfs_start,
250: kernfs_unmount,
251: kernfs_root,
1.82 pooka 252: (void *)eopnotsupp, /* vfs_quotactl */
1.59 christos 253: kernfs_statvfs,
1.1 cgd 254: kernfs_sync,
1.15 mycroft 255: kernfs_vget,
1.75 chs 256: (void *)eopnotsupp, /* vfs_fhtovp */
257: (void *)eopnotsupp, /* vfs_vptofh */
1.1 cgd 258: kernfs_init,
1.54 itojun 259: kernfs_reinit,
1.36 jdolecek 260: kernfs_done,
1.31 thorpej 261: NULL, /* vfs_mountroot */
1.63 hannken 262: (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
1.66 thorpej 263: vfs_stdextattrctl,
1.80 pooka 264: (void *)eopnotsupp, /* vfs_suspendctl */
1.83 dholland 265: genfs_renamelock_enter,
266: genfs_renamelock_exit,
1.84 ad 267: (void *)eopnotsupp,
1.31 thorpej 268: kernfs_vnodeopv_descs,
1.72 christos 269: 0,
270: { NULL, NULL },
1.1 cgd 271: };
1.85 rumble 272:
273: static int
274: kernfs_modcmd(modcmd_t cmd, void *arg)
275: {
1.86 rumble 276: int error;
1.85 rumble 277:
278: switch (cmd) {
279: case MODULE_CMD_INIT:
1.86 rumble 280: error = vfs_attach(&kernfs_vfsops);
281: if (error != 0)
282: break;
283: sysctl_createv(&kernfs_sysctl_log, 0, NULL, NULL,
284: CTLFLAG_PERMANENT,
285: CTLTYPE_NODE, "vfs", NULL,
286: NULL, 0, NULL, 0,
287: CTL_VFS, CTL_EOL);
288: sysctl_createv(&kernfs_sysctl_log, 0, NULL, NULL,
289: CTLFLAG_PERMANENT,
290: CTLTYPE_NODE, "kernfs",
291: SYSCTL_DESCR("/kern file system"),
292: NULL, 0, NULL, 0,
293: CTL_VFS, 11, CTL_EOL);
294: /*
295: * XXX the "11" above could be dynamic, thereby eliminating one
296: * more instance of the "number to vfs" mapping problem, but
297: * "11" is the order as taken from sys/mount.h
298: */
299: break;
1.85 rumble 300: case MODULE_CMD_FINI:
1.86 rumble 301: error = vfs_detach(&kernfs_vfsops);
302: if (error != 0)
303: break;
304: sysctl_teardown(&kernfs_sysctl_log);
305: break;
1.85 rumble 306: default:
1.86 rumble 307: error = ENOTTY;
308: break;
1.85 rumble 309: }
1.86 rumble 310:
311: return (error);
1.85 rumble 312: }
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