/* $NetBSD: kernfs_vfsops.c,v 1.91 2011/09/27 01:23:05 christos Exp $ */ /* * Copyright (c) 1992, 1993, 1995 * The Regents of the University of California. All rights reserved. * * This code is derived from software donated to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95 */ /* * Kernel params Filesystem */ #include __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.91 2011/09/27 01:23:05 christos Exp $"); #ifdef _KERNEL_OPT #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE(MODULE_CLASS_VFS, kernfs, NULL); MALLOC_JUSTDEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures"); dev_t rrootdev = NODEV; VFS_PROTOS(kernfs); void kernfs_get_rrootdev(void); static struct sysctllog *kernfs_sysctl_log; void kernfs_init(void) { malloc_type_attach(M_KERNFSMNT); kernfs_hashinit(); } void kernfs_reinit(void) { kernfs_hashreinit(); } void kernfs_done(void) { kernfs_hashdone(); malloc_type_detach(M_KERNFSMNT); } void kernfs_get_rrootdev(void) { static int tried = 0; if (tried) { /* Already did it once. */ return; } tried = 1; if (rootdev == NODEV) return; rrootdev = devsw_blk2chr(rootdev); if (rrootdev != NODEV) return; rrootdev = NODEV; printf("kernfs_get_rrootdev: no raw root device\n"); } /* * Mount the Kernel params filesystem */ int kernfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) { struct lwp *l = curlwp; int error = 0; struct kernfs_mount *fmp; if (UIO_MX & (UIO_MX - 1)) { log(LOG_ERR, "kernfs: invalid directory entry size"); return (EINVAL); } if (mp->mnt_flag & MNT_GETARGS) { *data_len = 0; return 0; } /* * Update is a no-op */ if (mp->mnt_flag & MNT_UPDATE) return (EOPNOTSUPP); fmp = malloc(sizeof(struct kernfs_mount), M_KERNFSMNT, M_WAITOK|M_ZERO); TAILQ_INIT(&fmp->nodelist); mp->mnt_stat.f_namemax = KERNFS_MAXNAMLEN; mp->mnt_flag |= MNT_LOCAL; mp->mnt_data = fmp; vfs_getnewfsid(mp); if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l)) != 0) { free(fmp, M_KERNFSMNT); return error; } kernfs_get_rrootdev(); return 0; } int kernfs_start(struct mount *mp, int flags) { return (0); } int kernfs_unmount(struct mount *mp, int mntflags) { int error; int flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; if ((error = vflush(mp, 0, flags)) != 0) return (error); /* * Finally, throw away the kernfs_mount structure */ free(mp->mnt_data, M_KERNFSMNT); mp->mnt_data = NULL; return (0); } int kernfs_root(struct mount *mp, struct vnode **vpp) { /* setup "." */ return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0)); } /*ARGSUSED*/ int kernfs_sync(struct mount *mp, int waitfor, kauth_cred_t uc) { return (0); } /* * Kernfs flat namespace lookup. * Currently unsupported. */ int kernfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) { return (EOPNOTSUPP); } extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { &kernfs_vnodeop_opv_desc, NULL, }; struct vfsops kernfs_vfsops = { MOUNT_KERNFS, 0, kernfs_mount, kernfs_start, kernfs_unmount, kernfs_root, (void *)eopnotsupp, /* vfs_quotactl */ genfs_statvfs, kernfs_sync, kernfs_vget, (void *)eopnotsupp, /* vfs_fhtovp */ (void *)eopnotsupp, /* vfs_vptofh */ kernfs_init, kernfs_reinit, kernfs_done, NULL, /* vfs_mountroot */ (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, vfs_stdextattrctl, (void *)eopnotsupp, /* vfs_suspendctl */ genfs_renamelock_enter, genfs_renamelock_exit, (void *)eopnotsupp, kernfs_vnodeopv_descs, 0, { NULL, NULL }, }; static int kernfs_modcmd(modcmd_t cmd, void *arg) { int error; switch (cmd) { case MODULE_CMD_INIT: error = vfs_attach(&kernfs_vfsops); if (error != 0) break; sysctl_createv(&kernfs_sysctl_log, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "vfs", NULL, NULL, 0, NULL, 0, CTL_VFS, CTL_EOL); sysctl_createv(&kernfs_sysctl_log, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "kernfs", SYSCTL_DESCR("/kern file system"), NULL, 0, NULL, 0, CTL_VFS, 11, CTL_EOL); /* * XXX the "11" above could be dynamic, thereby eliminating one * more instance of the "number to vfs" mapping problem, but * "11" is the order as taken from sys/mount.h */ break; case MODULE_CMD_FINI: error = vfs_detach(&kernfs_vfsops); if (error != 0) break; sysctl_teardown(&kernfs_sysctl_log); break; default: error = ENOTTY; break; } return (error); }