Annotation of src/sys/miscfs/kernfs/kernfs_vfsops.c, Revision 1.80
1.80 ! pooka 1: /* $NetBSD: kernfs_vfsops.c,v 1.79 2007/07/17 11:19:34 pooka 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>
1.80 ! pooka 42: __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.79 2007/07/17 11:19:34 pooka 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:
61: #include <miscfs/specfs/specdev.h>
1.9 mycroft 62: #include <miscfs/kernfs/kernfs.h>
1.1 cgd 63:
1.77 pooka 64: MALLOC_JUSTDEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
1.47 thorpej 65:
1.15 mycroft 66: dev_t rrootdev = NODEV;
67:
1.68 xtraeme 68: void kernfs_init(void);
69: void kernfs_reinit(void);
70: void kernfs_done(void);
71: void kernfs_get_rrootdev(void);
1.78 dsl 72: int kernfs_mount(struct mount *, const char *, void *, size_t *,
1.70 christos 73: struct nameidata *, struct lwp *);
74: int kernfs_start(struct mount *, int, struct lwp *);
75: int kernfs_unmount(struct mount *, int, struct lwp *);
76: int kernfs_statvfs(struct mount *, struct statvfs *, struct lwp *);
1.68 xtraeme 77: int kernfs_quotactl(struct mount *, int, uid_t, void *,
1.70 christos 78: struct lwp *);
1.71 elad 79: int kernfs_sync(struct mount *, int, kauth_cred_t, struct lwp *);
1.68 xtraeme 80: int kernfs_vget(struct mount *, ino_t, struct vnode **);
1.25 christos 81:
82: void
1.1 cgd 83: kernfs_init()
84: {
1.77 pooka 85:
1.49 christos 86: malloc_type_attach(M_KERNFSMNT);
1.54 itojun 87: kernfs_hashinit();
88: }
89:
90: void
91: kernfs_reinit()
92: {
93: kernfs_hashreinit();
1.10 cgd 94: }
95:
1.11 cgd 96: void
1.36 jdolecek 97: kernfs_done()
98: {
1.77 pooka 99:
100: kernfs_hashdone();
1.49 christos 101: malloc_type_detach(M_KERNFSMNT);
1.36 jdolecek 102: }
103:
104: void
1.15 mycroft 105: kernfs_get_rrootdev()
1.10 cgd 106: {
1.16 mycroft 107: static int tried = 0;
1.10 cgd 108:
1.16 mycroft 109: if (tried) {
1.15 mycroft 110: /* Already did it once. */
111: return;
112: }
1.16 mycroft 113: tried = 1;
114:
115: if (rootdev == NODEV)
116: return;
1.45 gehenna 117: rrootdev = devsw_blk2chr(rootdev);
1.54 itojun 118: if (rrootdev != NODEV)
1.45 gehenna 119: return;
1.16 mycroft 120: rrootdev = NODEV;
1.28 christos 121: printf("kernfs_get_rrootdev: no raw root device\n");
1.1 cgd 122: }
123:
124: /*
1.15 mycroft 125: * Mount the Kernel params filesystem
1.1 cgd 126: */
1.25 christos 127: int
1.78 dsl 128: kernfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len,
1.74 christos 129: struct nameidata *ndp, struct lwp *l)
1.1 cgd 130: {
131: int error = 0;
132: struct kernfs_mount *fmp;
133:
1.54 itojun 134: if (UIO_MX & (UIO_MX - 1)) {
135: log(LOG_ERR, "kernfs: invalid directory entry size");
136: return (EINVAL);
137: }
1.1 cgd 138:
1.78 dsl 139: if (mp->mnt_flag & MNT_GETARGS) {
140: *data_len = 0;
1.46 christos 141: return 0;
1.78 dsl 142: }
1.1 cgd 143: /*
144: * Update is a no-op
145: */
146: if (mp->mnt_flag & MNT_UPDATE)
147: return (EOPNOTSUPP);
148:
1.15 mycroft 149: MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
1.47 thorpej 150: M_KERNFSMNT, M_WAITOK);
1.54 itojun 151: memset(fmp, 0, sizeof(*fmp));
152: TAILQ_INIT(&fmp->nodelist);
153:
1.65 jdolecek 154: mp->mnt_stat.f_namemax = MAXNAMLEN;
155: mp->mnt_flag |= MNT_LOCAL;
1.54 itojun 156: mp->mnt_data = fmp;
1.37 assar 157: vfs_getnewfsid(mp);
1.1 cgd 158:
1.64 tron 159: if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs",
1.79 pooka 160: UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l)) != 0) {
1.64 tron 161: free(fmp, M_KERNFSMNT);
162: return error;
163: }
1.10 cgd 164:
1.15 mycroft 165: kernfs_get_rrootdev();
1.64 tron 166: return 0;
1.1 cgd 167: }
168:
1.25 christos 169: int
1.74 christos 170: kernfs_start(struct mount *mp, int flags,
171: struct lwp *l)
1.1 cgd 172: {
1.15 mycroft 173:
1.1 cgd 174: return (0);
175: }
176:
1.25 christos 177: int
1.74 christos 178: kernfs_unmount(struct mount *mp, int mntflags, struct lwp *l)
1.1 cgd 179: {
180: int error;
181: int flags = 0;
182:
1.54 itojun 183: if (mntflags & MNT_FORCE)
1.1 cgd 184: flags |= FORCECLOSE;
185:
1.54 itojun 186: if ((error = vflush(mp, 0, flags)) != 0)
1.1 cgd 187: return (error);
188:
189: /*
190: * Finally, throw away the kernfs_mount structure
191: */
1.47 thorpej 192: free(mp->mnt_data, M_KERNFSMNT);
1.64 tron 193: mp->mnt_data = NULL;
1.15 mycroft 194: return (0);
1.1 cgd 195: }
196:
1.25 christos 197: int
1.51 thorpej 198: kernfs_root(mp, vpp)
1.1 cgd 199: struct mount *mp;
200: struct vnode **vpp;
201: {
202:
1.54 itojun 203: /* setup "." */
1.56 darcy 204: return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0));
1.1 cgd 205: }
206:
1.25 christos 207: int
1.74 christos 208: kernfs_quotactl(struct mount *mp, int cmd, uid_t uid,
209: void *arg, struct lwp *l)
1.1 cgd 210: {
1.15 mycroft 211:
1.1 cgd 212: return (EOPNOTSUPP);
213: }
214:
1.25 christos 215: int
1.74 christos 216: kernfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l)
1.1 cgd 217: {
218:
219: sbp->f_bsize = DEV_BSIZE;
1.59 christos 220: sbp->f_frsize = DEV_BSIZE;
1.13 cgd 221: sbp->f_iosize = DEV_BSIZE;
1.1 cgd 222: sbp->f_blocks = 2; /* 1K to keep df happy */
223: sbp->f_bfree = 0;
224: sbp->f_bavail = 0;
1.59 christos 225: sbp->f_bresvd = 0;
1.54 itojun 226: sbp->f_files = 1024; /* XXX lie */
227: sbp->f_ffree = 128; /* XXX lie */
1.59 christos 228: sbp->f_favail = 128; /* XXX lie */
229: sbp->f_fresvd = 0;
230: copy_statvfs_info(sbp, mp);
1.1 cgd 231: return (0);
232: }
233:
1.25 christos 234: /*ARGSUSED*/
235: int
1.74 christos 236: kernfs_sync(struct mount *mp, int waitfor,
237: kauth_cred_t uc, struct lwp *l)
1.1 cgd 238: {
1.15 mycroft 239:
1.1 cgd 240: return (0);
241: }
242:
1.15 mycroft 243: /*
244: * Kernfs flat namespace lookup.
245: * Currently unsupported.
246: */
1.25 christos 247: int
1.74 christos 248: kernfs_vget(struct mount *mp, ino_t ino,
249: struct vnode **vpp)
1.15 mycroft 250: {
251:
252: return (EOPNOTSUPP);
253: }
254:
1.58 atatat 255: SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup")
1.32 fvdl 256: {
1.57 atatat 257:
1.58 atatat 258: sysctl_createv(clog, 0, NULL, NULL,
259: CTLFLAG_PERMANENT,
1.57 atatat 260: CTLTYPE_NODE, "vfs", NULL,
261: NULL, 0, NULL, 0,
262: CTL_VFS, CTL_EOL);
1.58 atatat 263: sysctl_createv(clog, 0, NULL, NULL,
264: CTLFLAG_PERMANENT,
1.62 atatat 265: CTLTYPE_NODE, "kernfs",
266: SYSCTL_DESCR("/kern file system"),
1.57 atatat 267: NULL, 0, NULL, 0,
268: CTL_VFS, 11, CTL_EOL);
269: /*
270: * XXX the "11" above could be dynamic, thereby eliminating one
271: * more instance of the "number to vfs" mapping problem, but
272: * "11" is the order as taken from sys/mount.h
273: */
1.32 fvdl 274: }
275:
1.38 jdolecek 276: extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;
1.31 thorpej 277:
1.38 jdolecek 278: const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
1.31 thorpej 279: &kernfs_vnodeop_opv_desc,
280: NULL,
281: };
282:
1.1 cgd 283: struct vfsops kernfs_vfsops = {
1.12 cgd 284: MOUNT_KERNFS,
1.78 dsl 285: 0,
1.1 cgd 286: kernfs_mount,
287: kernfs_start,
288: kernfs_unmount,
289: kernfs_root,
290: kernfs_quotactl,
1.59 christos 291: kernfs_statvfs,
1.1 cgd 292: kernfs_sync,
1.15 mycroft 293: kernfs_vget,
1.75 chs 294: (void *)eopnotsupp, /* vfs_fhtovp */
295: (void *)eopnotsupp, /* vfs_vptofh */
1.1 cgd 296: kernfs_init,
1.54 itojun 297: kernfs_reinit,
1.36 jdolecek 298: kernfs_done,
1.31 thorpej 299: NULL, /* vfs_mountroot */
1.63 hannken 300: (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
1.66 thorpej 301: vfs_stdextattrctl,
1.80 ! pooka 302: (void *)eopnotsupp, /* vfs_suspendctl */
1.31 thorpej 303: kernfs_vnodeopv_descs,
1.72 christos 304: 0,
305: { NULL, NULL },
1.1 cgd 306: };
1.67 thorpej 307: VFS_ATTACH(kernfs_vfsops);
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