Annotation of src/sys/miscfs/kernfs/kernfs_vfsops.c, Revision 1.84
1.84 ! ad 1: /* $NetBSD: kernfs_vfsops.c,v 1.83 2008/01/28 14:31:18 dholland 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>
1.84 ! ad 42: __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.83 2008/01/28 14:31:18 dholland 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>
1.15 mycroft 60:
1.83 dholland 61: #include <miscfs/genfs/genfs.h>
1.15 mycroft 62: #include <miscfs/specfs/specdev.h>
1.9 mycroft 63: #include <miscfs/kernfs/kernfs.h>
1.1 cgd 64:
1.77 pooka 65: MALLOC_JUSTDEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
1.47 thorpej 66:
1.15 mycroft 67: dev_t rrootdev = NODEV;
68:
1.81 pooka 69: VFS_PROTOS(kernfs);
70:
1.68 xtraeme 71: void kernfs_get_rrootdev(void);
1.25 christos 72:
73: void
1.1 cgd 74: kernfs_init()
75: {
1.77 pooka 76:
1.49 christos 77: malloc_type_attach(M_KERNFSMNT);
1.54 itojun 78: kernfs_hashinit();
79: }
80:
81: void
82: kernfs_reinit()
83: {
84: kernfs_hashreinit();
1.10 cgd 85: }
86:
1.11 cgd 87: void
1.36 jdolecek 88: kernfs_done()
89: {
1.77 pooka 90:
91: kernfs_hashdone();
1.49 christos 92: malloc_type_detach(M_KERNFSMNT);
1.36 jdolecek 93: }
94:
95: void
1.15 mycroft 96: kernfs_get_rrootdev()
1.10 cgd 97: {
1.16 mycroft 98: static int tried = 0;
1.10 cgd 99:
1.16 mycroft 100: if (tried) {
1.15 mycroft 101: /* Already did it once. */
102: return;
103: }
1.16 mycroft 104: tried = 1;
105:
106: if (rootdev == NODEV)
107: return;
1.45 gehenna 108: rrootdev = devsw_blk2chr(rootdev);
1.54 itojun 109: if (rrootdev != NODEV)
1.45 gehenna 110: return;
1.16 mycroft 111: rrootdev = NODEV;
1.28 christos 112: printf("kernfs_get_rrootdev: no raw root device\n");
1.1 cgd 113: }
114:
115: /*
1.15 mycroft 116: * Mount the Kernel params filesystem
1.1 cgd 117: */
1.25 christos 118: int
1.82 pooka 119: kernfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
1.1 cgd 120: {
1.82 pooka 121: struct lwp *l = curlwp;
1.1 cgd 122: int error = 0;
123: struct kernfs_mount *fmp;
124:
1.54 itojun 125: if (UIO_MX & (UIO_MX - 1)) {
126: log(LOG_ERR, "kernfs: invalid directory entry size");
127: return (EINVAL);
128: }
1.1 cgd 129:
1.78 dsl 130: if (mp->mnt_flag & MNT_GETARGS) {
131: *data_len = 0;
1.46 christos 132: return 0;
1.78 dsl 133: }
1.1 cgd 134: /*
135: * Update is a no-op
136: */
137: if (mp->mnt_flag & MNT_UPDATE)
138: return (EOPNOTSUPP);
139:
1.15 mycroft 140: MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
1.47 thorpej 141: M_KERNFSMNT, M_WAITOK);
1.54 itojun 142: memset(fmp, 0, sizeof(*fmp));
143: TAILQ_INIT(&fmp->nodelist);
144:
1.65 jdolecek 145: mp->mnt_stat.f_namemax = MAXNAMLEN;
146: mp->mnt_flag |= MNT_LOCAL;
1.54 itojun 147: mp->mnt_data = fmp;
1.37 assar 148: vfs_getnewfsid(mp);
1.1 cgd 149:
1.64 tron 150: if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs",
1.79 pooka 151: UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l)) != 0) {
1.64 tron 152: free(fmp, M_KERNFSMNT);
153: return error;
154: }
1.10 cgd 155:
1.15 mycroft 156: kernfs_get_rrootdev();
1.64 tron 157: return 0;
1.1 cgd 158: }
159:
1.25 christos 160: int
1.82 pooka 161: kernfs_start(struct mount *mp, int flags)
1.1 cgd 162: {
1.15 mycroft 163:
1.1 cgd 164: return (0);
165: }
166:
1.25 christos 167: int
1.82 pooka 168: kernfs_unmount(struct mount *mp, int mntflags)
1.1 cgd 169: {
170: int error;
171: int flags = 0;
172:
1.54 itojun 173: if (mntflags & MNT_FORCE)
1.1 cgd 174: flags |= FORCECLOSE;
175:
1.54 itojun 176: if ((error = vflush(mp, 0, flags)) != 0)
1.1 cgd 177: return (error);
178:
179: /*
180: * Finally, throw away the kernfs_mount structure
181: */
1.47 thorpej 182: free(mp->mnt_data, M_KERNFSMNT);
1.64 tron 183: mp->mnt_data = NULL;
1.15 mycroft 184: return (0);
1.1 cgd 185: }
186:
1.25 christos 187: int
1.51 thorpej 188: kernfs_root(mp, vpp)
1.1 cgd 189: struct mount *mp;
190: struct vnode **vpp;
191: {
192:
1.54 itojun 193: /* setup "." */
1.56 darcy 194: return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0));
1.1 cgd 195: }
196:
1.25 christos 197: int
1.82 pooka 198: kernfs_statvfs(struct mount *mp, struct statvfs *sbp)
1.1 cgd 199: {
200:
201: sbp->f_bsize = DEV_BSIZE;
1.59 christos 202: sbp->f_frsize = DEV_BSIZE;
1.13 cgd 203: sbp->f_iosize = DEV_BSIZE;
1.1 cgd 204: sbp->f_blocks = 2; /* 1K to keep df happy */
205: sbp->f_bfree = 0;
206: sbp->f_bavail = 0;
1.59 christos 207: sbp->f_bresvd = 0;
1.54 itojun 208: sbp->f_files = 1024; /* XXX lie */
209: sbp->f_ffree = 128; /* XXX lie */
1.59 christos 210: sbp->f_favail = 128; /* XXX lie */
211: sbp->f_fresvd = 0;
212: copy_statvfs_info(sbp, mp);
1.1 cgd 213: return (0);
214: }
215:
1.25 christos 216: /*ARGSUSED*/
217: int
1.74 christos 218: kernfs_sync(struct mount *mp, int waitfor,
1.82 pooka 219: kauth_cred_t uc)
1.1 cgd 220: {
1.15 mycroft 221:
1.1 cgd 222: return (0);
223: }
224:
1.15 mycroft 225: /*
226: * Kernfs flat namespace lookup.
227: * Currently unsupported.
228: */
1.25 christos 229: int
1.74 christos 230: kernfs_vget(struct mount *mp, ino_t ino,
231: struct vnode **vpp)
1.15 mycroft 232: {
233:
234: return (EOPNOTSUPP);
235: }
236:
1.58 atatat 237: SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup")
1.32 fvdl 238: {
1.57 atatat 239:
1.58 atatat 240: sysctl_createv(clog, 0, NULL, NULL,
241: CTLFLAG_PERMANENT,
1.57 atatat 242: CTLTYPE_NODE, "vfs", NULL,
243: NULL, 0, NULL, 0,
244: CTL_VFS, CTL_EOL);
1.58 atatat 245: sysctl_createv(clog, 0, NULL, NULL,
246: CTLFLAG_PERMANENT,
1.62 atatat 247: CTLTYPE_NODE, "kernfs",
248: SYSCTL_DESCR("/kern file system"),
1.57 atatat 249: NULL, 0, NULL, 0,
250: CTL_VFS, 11, CTL_EOL);
251: /*
252: * XXX the "11" above could be dynamic, thereby eliminating one
253: * more instance of the "number to vfs" mapping problem, but
254: * "11" is the order as taken from sys/mount.h
255: */
1.32 fvdl 256: }
257:
1.38 jdolecek 258: extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;
1.31 thorpej 259:
1.38 jdolecek 260: const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
1.31 thorpej 261: &kernfs_vnodeop_opv_desc,
262: NULL,
263: };
264:
1.1 cgd 265: struct vfsops kernfs_vfsops = {
1.12 cgd 266: MOUNT_KERNFS,
1.78 dsl 267: 0,
1.1 cgd 268: kernfs_mount,
269: kernfs_start,
270: kernfs_unmount,
271: kernfs_root,
1.82 pooka 272: (void *)eopnotsupp, /* vfs_quotactl */
1.59 christos 273: kernfs_statvfs,
1.1 cgd 274: kernfs_sync,
1.15 mycroft 275: kernfs_vget,
1.75 chs 276: (void *)eopnotsupp, /* vfs_fhtovp */
277: (void *)eopnotsupp, /* vfs_vptofh */
1.1 cgd 278: kernfs_init,
1.54 itojun 279: kernfs_reinit,
1.36 jdolecek 280: kernfs_done,
1.31 thorpej 281: NULL, /* vfs_mountroot */
1.63 hannken 282: (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
1.66 thorpej 283: vfs_stdextattrctl,
1.80 pooka 284: (void *)eopnotsupp, /* vfs_suspendctl */
1.83 dholland 285: genfs_renamelock_enter,
286: genfs_renamelock_exit,
1.84 ! ad 287: (void *)eopnotsupp,
1.31 thorpej 288: kernfs_vnodeopv_descs,
1.72 christos 289: 0,
290: { NULL, NULL },
1.1 cgd 291: };
1.67 thorpej 292: VFS_ATTACH(kernfs_vfsops);
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