vfs_mountroot.c revision 288091
1213365Smarcel/*- 2214006Smarcel * Copyright (c) 2010 Marcel Moolenaar 3213365Smarcel * Copyright (c) 1999-2004 Poul-Henning Kamp 4213365Smarcel * Copyright (c) 1999 Michael Smith 5213365Smarcel * Copyright (c) 1989, 1993 6213365Smarcel * The Regents of the University of California. All rights reserved. 7213365Smarcel * (c) UNIX System Laboratories, Inc. 8213365Smarcel * All or some portions of this file are derived from material licensed 9213365Smarcel * to the University of California by American Telephone and Telegraph 10213365Smarcel * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11213365Smarcel * the permission of UNIX System Laboratories, Inc. 12213365Smarcel * 13213365Smarcel * Redistribution and use in source and binary forms, with or without 14213365Smarcel * modification, are permitted provided that the following conditions 15213365Smarcel * are met: 16213365Smarcel * 1. Redistributions of source code must retain the above copyright 17213365Smarcel * notice, this list of conditions and the following disclaimer. 18213365Smarcel * 2. Redistributions in binary form must reproduce the above copyright 19213365Smarcel * notice, this list of conditions and the following disclaimer in the 20213365Smarcel * documentation and/or other materials provided with the distribution. 21213365Smarcel * 4. Neither the name of the University nor the names of its contributors 22213365Smarcel * may be used to endorse or promote products derived from this software 23213365Smarcel * without specific prior written permission. 24213365Smarcel * 25213365Smarcel * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26213365Smarcel * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27213365Smarcel * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28213365Smarcel * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29213365Smarcel * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30213365Smarcel * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31213365Smarcel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32213365Smarcel * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33213365Smarcel * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34213365Smarcel * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35213365Smarcel * SUCH DAMAGE. 36213365Smarcel */ 37213365Smarcel 38214006Smarcel#include "opt_rootdevname.h" 39214006Smarcel 40213365Smarcel#include <sys/cdefs.h> 41213365Smarcel__FBSDID("$FreeBSD: head/sys/kern/vfs_mountroot.c 288091 2015-09-22 03:34:07Z bdrewery $"); 42213365Smarcel 43213365Smarcel#include <sys/param.h> 44213365Smarcel#include <sys/conf.h> 45228634Savg#include <sys/cons.h> 46213365Smarcel#include <sys/fcntl.h> 47213365Smarcel#include <sys/jail.h> 48213365Smarcel#include <sys/kernel.h> 49213365Smarcel#include <sys/malloc.h> 50214006Smarcel#include <sys/mdioctl.h> 51213365Smarcel#include <sys/mount.h> 52213365Smarcel#include <sys/mutex.h> 53213365Smarcel#include <sys/namei.h> 54213365Smarcel#include <sys/priv.h> 55213365Smarcel#include <sys/proc.h> 56213365Smarcel#include <sys/filedesc.h> 57213365Smarcel#include <sys/reboot.h> 58223919Sae#include <sys/sbuf.h> 59214006Smarcel#include <sys/stat.h> 60213365Smarcel#include <sys/syscallsubr.h> 61213365Smarcel#include <sys/sysproto.h> 62213365Smarcel#include <sys/sx.h> 63213365Smarcel#include <sys/sysctl.h> 64213365Smarcel#include <sys/sysent.h> 65213365Smarcel#include <sys/systm.h> 66213365Smarcel#include <sys/vnode.h> 67213365Smarcel 68213365Smarcel#include <geom/geom.h> 69213365Smarcel 70213365Smarcel/* 71213365Smarcel * The root filesystem is detailed in the kernel environment variable 72213365Smarcel * vfs.root.mountfrom, which is expected to be in the general format 73213365Smarcel * 74213365Smarcel * <vfsname>:[<path>][ <vfsname>:[<path>] ...] 75213365Smarcel * vfsname := the name of a VFS known to the kernel and capable 76213365Smarcel * of being mounted as root 77213365Smarcel * path := disk device name or other data used by the filesystem 78213365Smarcel * to locate its physical store 79213365Smarcel * 80213365Smarcel * If the environment variable vfs.root.mountfrom is a space separated list, 81213365Smarcel * each list element is tried in turn and the root filesystem will be mounted 82213365Smarcel * from the first one that suceeds. 83213365Smarcel * 84213365Smarcel * The environment variable vfs.root.mountfrom.options is a comma delimited 85213365Smarcel * set of string mount options. These mount options must be parseable 86213365Smarcel * by nmount() in the kernel. 87213365Smarcel */ 88213365Smarcel 89214006Smarcelstatic int parse_mount(char **); 90214006Smarcelstatic struct mntarg *parse_mountroot_options(struct mntarg *, const char *); 91214006Smarcel 92213365Smarcel/* 93214006Smarcel * The vnode of the system's root (/ in the filesystem, without chroot 94214006Smarcel * active.) 95213365Smarcel */ 96214006Smarcelstruct vnode *rootvnode; 97213365Smarcel 98287107Strasz/* 99287107Strasz * Mount of the system's /dev. 100287107Strasz */ 101287107Straszstruct mount *rootdevmp; 102287107Strasz 103214006Smarcelchar *rootdevnames[2] = {NULL, NULL}; 104213365Smarcel 105267351Smavstruct mtx root_holds_mtx; 106267351SmavMTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF); 107267351Smav 108213365Smarcelstruct root_hold_token { 109213365Smarcel const char *who; 110213365Smarcel LIST_ENTRY(root_hold_token) list; 111213365Smarcel}; 112213365Smarcel 113213365Smarcelstatic LIST_HEAD(, root_hold_token) root_holds = 114213365Smarcel LIST_HEAD_INITIALIZER(root_holds); 115213365Smarcel 116214006Smarcelenum action { 117214006Smarcel A_CONTINUE, 118214006Smarcel A_PANIC, 119214006Smarcel A_REBOOT, 120214006Smarcel A_RETRY 121214006Smarcel}; 122214006Smarcel 123214006Smarcelstatic enum action root_mount_onfail = A_CONTINUE; 124214006Smarcel 125214006Smarcelstatic int root_mount_mddev; 126213365Smarcelstatic int root_mount_complete; 127213365Smarcel 128214006Smarcel/* By default wait up to 3 seconds for devices to appear. */ 129214006Smarcelstatic int root_mount_timeout = 3; 130253910SmarcelTUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 131214006Smarcel 132213365Smarcelstruct root_hold_token * 133213365Smarcelroot_mount_hold(const char *identifier) 134213365Smarcel{ 135213365Smarcel struct root_hold_token *h; 136213365Smarcel 137213365Smarcel if (root_mounted()) 138213365Smarcel return (NULL); 139213365Smarcel 140213365Smarcel h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 141213365Smarcel h->who = identifier; 142267351Smav mtx_lock(&root_holds_mtx); 143213365Smarcel LIST_INSERT_HEAD(&root_holds, h, list); 144267351Smav mtx_unlock(&root_holds_mtx); 145213365Smarcel return (h); 146213365Smarcel} 147213365Smarcel 148213365Smarcelvoid 149213365Smarcelroot_mount_rel(struct root_hold_token *h) 150213365Smarcel{ 151213365Smarcel 152213365Smarcel if (h == NULL) 153213365Smarcel return; 154267351Smav mtx_lock(&root_holds_mtx); 155213365Smarcel LIST_REMOVE(h, list); 156213365Smarcel wakeup(&root_holds); 157267351Smav mtx_unlock(&root_holds_mtx); 158213365Smarcel free(h, M_DEVBUF); 159213365Smarcel} 160213365Smarcel 161213365Smarcelint 162213365Smarcelroot_mounted(void) 163213365Smarcel{ 164213365Smarcel 165213365Smarcel /* No mutex is acquired here because int stores are atomic. */ 166213365Smarcel return (root_mount_complete); 167213365Smarcel} 168213365Smarcel 169213365Smarcelvoid 170213365Smarcelroot_mount_wait(void) 171213365Smarcel{ 172213365Smarcel 173213365Smarcel /* 174213365Smarcel * Panic on an obvious deadlock - the function can't be called from 175213365Smarcel * a thread which is doing the whole SYSINIT stuff. 176213365Smarcel */ 177213365Smarcel KASSERT(curthread->td_proc->p_pid != 0, 178213365Smarcel ("root_mount_wait: cannot be called from the swapper thread")); 179267351Smav mtx_lock(&root_holds_mtx); 180213365Smarcel while (!root_mount_complete) { 181267351Smav msleep(&root_mount_complete, &root_holds_mtx, PZERO, "rootwait", 182213365Smarcel hz); 183213365Smarcel } 184267351Smav mtx_unlock(&root_holds_mtx); 185213365Smarcel} 186213365Smarcel 187213365Smarcelstatic void 188213365Smarcelset_rootvnode(void) 189213365Smarcel{ 190213365Smarcel struct proc *p; 191213365Smarcel 192213365Smarcel if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 193213365Smarcel panic("Cannot find root vnode"); 194213365Smarcel 195213365Smarcel VOP_UNLOCK(rootvnode, 0); 196213365Smarcel 197213365Smarcel p = curthread->td_proc; 198213365Smarcel FILEDESC_XLOCK(p->p_fd); 199213365Smarcel 200213365Smarcel if (p->p_fd->fd_cdir != NULL) 201213365Smarcel vrele(p->p_fd->fd_cdir); 202213365Smarcel p->p_fd->fd_cdir = rootvnode; 203213365Smarcel VREF(rootvnode); 204213365Smarcel 205213365Smarcel if (p->p_fd->fd_rdir != NULL) 206213365Smarcel vrele(p->p_fd->fd_rdir); 207213365Smarcel p->p_fd->fd_rdir = rootvnode; 208213365Smarcel VREF(rootvnode); 209213365Smarcel 210213365Smarcel FILEDESC_XUNLOCK(p->p_fd); 211213365Smarcel} 212213365Smarcel 213214006Smarcelstatic int 214214006Smarcelvfs_mountroot_devfs(struct thread *td, struct mount **mpp) 215213365Smarcel{ 216213365Smarcel struct vfsoptlist *opts; 217213365Smarcel struct vfsconf *vfsp; 218214006Smarcel struct mount *mp; 219213365Smarcel int error; 220213365Smarcel 221214006Smarcel *mpp = NULL; 222214006Smarcel 223287964Strasz if (rootdevmp != NULL) { 224287964Strasz /* 225287964Strasz * Already have /dev; this happens during rerooting. 226287964Strasz */ 227287964Strasz error = vfs_busy(rootdevmp, 0); 228287964Strasz if (error != 0) 229287964Strasz return (error); 230287964Strasz *mpp = rootdevmp; 231287964Strasz } else { 232287964Strasz vfsp = vfs_byname("devfs"); 233287964Strasz KASSERT(vfsp != NULL, ("Could not find devfs by name")); 234287964Strasz if (vfsp == NULL) 235287964Strasz return (ENOENT); 236213365Smarcel 237287964Strasz mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 238213365Smarcel 239287964Strasz error = VFS_MOUNT(mp); 240287964Strasz KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 241287964Strasz if (error) 242287964Strasz return (error); 243213365Smarcel 244287964Strasz opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 245287964Strasz TAILQ_INIT(opts); 246287964Strasz mp->mnt_opt = opts; 247213365Smarcel 248287964Strasz mtx_lock(&mountlist_mtx); 249287964Strasz TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 250287964Strasz mtx_unlock(&mountlist_mtx); 251213365Smarcel 252287964Strasz *mpp = mp; 253287964Strasz rootdevmp = mp; 254287964Strasz } 255287964Strasz 256213365Smarcel set_rootvnode(); 257213365Smarcel 258274476Skib error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 259213365Smarcel if (error) 260213365Smarcel printf("kern_symlink /dev -> / returns %d\n", error); 261214006Smarcel 262214006Smarcel return (error); 263213365Smarcel} 264213365Smarcel 265288091Sbdrewerystatic void 266214006Smarcelvfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 267213365Smarcel{ 268213365Smarcel struct nameidata nd; 269214006Smarcel struct mount *mporoot, *mpnroot; 270214006Smarcel struct vnode *vp, *vporoot, *vpdevfs; 271214006Smarcel char *fspath; 272213365Smarcel int error; 273213365Smarcel 274214006Smarcel mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 275214006Smarcel 276214006Smarcel /* Shuffle the mountlist. */ 277213365Smarcel mtx_lock(&mountlist_mtx); 278214006Smarcel mporoot = TAILQ_FIRST(&mountlist); 279214006Smarcel TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 280214006Smarcel if (mporoot != mpdevfs) { 281214006Smarcel TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 282214006Smarcel TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 283214006Smarcel } 284214006Smarcel TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 285213365Smarcel mtx_unlock(&mountlist_mtx); 286213365Smarcel 287214006Smarcel cache_purgevfs(mporoot); 288214006Smarcel if (mporoot != mpdevfs) 289214006Smarcel cache_purgevfs(mpdevfs); 290213365Smarcel 291214006Smarcel VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 292214006Smarcel 293214006Smarcel VI_LOCK(vporoot); 294214006Smarcel vporoot->v_iflag &= ~VI_MOUNT; 295214006Smarcel VI_UNLOCK(vporoot); 296214006Smarcel vporoot->v_mountedhere = NULL; 297214006Smarcel mporoot->mnt_flag &= ~MNT_ROOTFS; 298214006Smarcel mporoot->mnt_vnodecovered = NULL; 299214006Smarcel vput(vporoot); 300214006Smarcel 301214006Smarcel /* Set up the new rootvnode, and purge the cache */ 302214006Smarcel mpnroot->mnt_vnodecovered = NULL; 303213365Smarcel set_rootvnode(); 304213365Smarcel cache_purgevfs(rootvnode->v_mount); 305213365Smarcel 306214006Smarcel if (mporoot != mpdevfs) { 307214006Smarcel /* Remount old root under /.mount or /mnt */ 308214006Smarcel fspath = "/.mount"; 309214006Smarcel NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 310214006Smarcel fspath, td); 311214006Smarcel error = namei(&nd); 312214006Smarcel if (error) { 313214006Smarcel NDFREE(&nd, NDF_ONLY_PNBUF); 314214006Smarcel fspath = "/mnt"; 315214006Smarcel NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 316214006Smarcel fspath, td); 317214006Smarcel error = namei(&nd); 318214006Smarcel } 319214006Smarcel if (!error) { 320214006Smarcel vp = nd.ni_vp; 321214006Smarcel error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 322214006Smarcel if (!error) 323214006Smarcel error = vinvalbuf(vp, V_SAVE, 0, 0); 324214006Smarcel if (!error) { 325214006Smarcel cache_purge(vp); 326214006Smarcel mporoot->mnt_vnodecovered = vp; 327214006Smarcel vp->v_mountedhere = mporoot; 328214006Smarcel strlcpy(mporoot->mnt_stat.f_mntonname, 329214006Smarcel fspath, MNAMELEN); 330214006Smarcel VOP_UNLOCK(vp, 0); 331214006Smarcel } else 332214006Smarcel vput(vp); 333214006Smarcel } 334214006Smarcel NDFREE(&nd, NDF_ONLY_PNBUF); 335214006Smarcel 336214006Smarcel if (error && bootverbose) 337214006Smarcel printf("mountroot: unable to remount previous root " 338214006Smarcel "under /.mount or /mnt (error %d).\n", error); 339214006Smarcel } 340214006Smarcel 341214006Smarcel /* Remount devfs under /dev */ 342213365Smarcel NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 343213365Smarcel error = namei(&nd); 344214006Smarcel if (!error) { 345214006Smarcel vp = nd.ni_vp; 346214006Smarcel error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 347214006Smarcel if (!error) 348214006Smarcel error = vinvalbuf(vp, V_SAVE, 0, 0); 349214006Smarcel if (!error) { 350214006Smarcel vpdevfs = mpdevfs->mnt_vnodecovered; 351214006Smarcel if (vpdevfs != NULL) { 352214006Smarcel cache_purge(vpdevfs); 353214006Smarcel vpdevfs->v_mountedhere = NULL; 354214006Smarcel vrele(vpdevfs); 355214006Smarcel } 356214006Smarcel mpdevfs->mnt_vnodecovered = vp; 357214006Smarcel vp->v_mountedhere = mpdevfs; 358214006Smarcel VOP_UNLOCK(vp, 0); 359214006Smarcel } else 360214006Smarcel vput(vp); 361213365Smarcel } 362214006Smarcel if (error && bootverbose) 363214006Smarcel printf("mountroot: unable to remount devfs under /dev " 364214006Smarcel "(error %d).\n", error); 365213365Smarcel NDFREE(&nd, NDF_ONLY_PNBUF); 366214006Smarcel 367214006Smarcel if (mporoot == mpdevfs) { 368214006Smarcel vfs_unbusy(mpdevfs); 369214006Smarcel /* Unlink the no longer needed /dev/dev -> / symlink */ 370274476Skib error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 371274476Skib UIO_SYSSPACE, 0); 372214006Smarcel if (error && bootverbose) 373214006Smarcel printf("mountroot: unable to unlink /dev/dev " 374214006Smarcel "(error %d)\n", error); 375213365Smarcel } 376214006Smarcel} 377214006Smarcel 378214006Smarcel/* 379214006Smarcel * Configuration parser. 380214006Smarcel */ 381214006Smarcel 382214006Smarcel/* Parser character classes. */ 383214006Smarcel#define CC_WHITESPACE -1 384214006Smarcel#define CC_NONWHITESPACE -2 385214006Smarcel 386214006Smarcel/* Parse errors. */ 387214006Smarcel#define PE_EOF -1 388214006Smarcel#define PE_EOL -2 389214006Smarcel 390214006Smarcelstatic __inline int 391214006Smarcelparse_peek(char **conf) 392214006Smarcel{ 393214006Smarcel 394214006Smarcel return (**conf); 395214006Smarcel} 396214006Smarcel 397214006Smarcelstatic __inline void 398214006Smarcelparse_poke(char **conf, int c) 399214006Smarcel{ 400214006Smarcel 401214006Smarcel **conf = c; 402214006Smarcel} 403214006Smarcel 404214006Smarcelstatic __inline void 405214006Smarcelparse_advance(char **conf) 406214006Smarcel{ 407214006Smarcel 408214006Smarcel (*conf)++; 409214006Smarcel} 410214006Smarcel 411214006Smarcelstatic int 412214006Smarcelparse_skipto(char **conf, int mc) 413214006Smarcel{ 414214006Smarcel int c, match; 415214006Smarcel 416214006Smarcel while (1) { 417214006Smarcel c = parse_peek(conf); 418214006Smarcel if (c == 0) 419214006Smarcel return (PE_EOF); 420214006Smarcel switch (mc) { 421214006Smarcel case CC_WHITESPACE: 422214006Smarcel match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 423214006Smarcel break; 424214006Smarcel case CC_NONWHITESPACE: 425214006Smarcel if (c == '\n') 426214006Smarcel return (PE_EOL); 427214006Smarcel match = (c != ' ' && c != '\t') ? 1 : 0; 428214006Smarcel break; 429214006Smarcel default: 430214006Smarcel match = (c == mc) ? 1 : 0; 431214006Smarcel break; 432214006Smarcel } 433214006Smarcel if (match) 434214006Smarcel break; 435214006Smarcel parse_advance(conf); 436213365Smarcel } 437214006Smarcel return (0); 438214006Smarcel} 439213365Smarcel 440214006Smarcelstatic int 441214006Smarcelparse_token(char **conf, char **tok) 442214006Smarcel{ 443214006Smarcel char *p; 444214006Smarcel size_t len; 445214006Smarcel int error; 446214006Smarcel 447214006Smarcel *tok = NULL; 448214006Smarcel error = parse_skipto(conf, CC_NONWHITESPACE); 449213365Smarcel if (error) 450214006Smarcel return (error); 451214006Smarcel p = *conf; 452214006Smarcel error = parse_skipto(conf, CC_WHITESPACE); 453214006Smarcel len = *conf - p; 454214006Smarcel *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 455214006Smarcel bcopy(p, *tok, len); 456214006Smarcel return (0); 457213365Smarcel} 458213365Smarcel 459214006Smarcelstatic void 460214006Smarcelparse_dir_ask_printenv(const char *var) 461213365Smarcel{ 462214006Smarcel char *val; 463213365Smarcel 464273174Sdavide val = kern_getenv(var); 465214006Smarcel if (val != NULL) { 466214006Smarcel printf(" %s=%s\n", var, val); 467214006Smarcel freeenv(val); 468214006Smarcel } 469214006Smarcel} 470213365Smarcel 471214006Smarcelstatic int 472214006Smarcelparse_dir_ask(char **conf) 473214006Smarcel{ 474214006Smarcel char name[80]; 475214006Smarcel char *mnt; 476214006Smarcel int error; 477213365Smarcel 478214006Smarcel printf("\nLoader variables:\n"); 479214006Smarcel parse_dir_ask_printenv("vfs.root.mountfrom"); 480214006Smarcel parse_dir_ask_printenv("vfs.root.mountfrom.options"); 481213365Smarcel 482214006Smarcel printf("\nManual root filesystem specification:\n"); 483214006Smarcel printf(" <fstype>:<device> [options]\n"); 484214006Smarcel printf(" Mount <device> using filesystem <fstype>\n"); 485214006Smarcel printf(" and with the specified (optional) option list.\n"); 486214006Smarcel printf("\n"); 487214006Smarcel printf(" eg. ufs:/dev/da0s1a\n"); 488214006Smarcel printf(" zfs:tank\n"); 489214006Smarcel printf(" cd9660:/dev/acd0 ro\n"); 490214006Smarcel printf(" (which is equivalent to: "); 491214006Smarcel printf("mount -t cd9660 -o ro /dev/acd0 /)\n"); 492214006Smarcel printf("\n"); 493214006Smarcel printf(" ? List valid disk boot devices\n"); 494214006Smarcel printf(" . Yield 1 second (for background tasks)\n"); 495214006Smarcel printf(" <empty line> Abort manual input\n"); 496214006Smarcel 497226673Smarcel do { 498226673Smarcel error = EINVAL; 499226673Smarcel printf("\nmountroot> "); 500228634Savg cngets(name, sizeof(name), GETS_ECHO); 501226673Smarcel if (name[0] == '\0') 502226673Smarcel break; 503226673Smarcel if (name[0] == '?' && name[1] == '\0') { 504226673Smarcel printf("\nList of GEOM managed disk devices:\n "); 505226673Smarcel g_dev_print(); 506226673Smarcel continue; 507226673Smarcel } 508226673Smarcel if (name[0] == '.' && name[1] == '\0') { 509226673Smarcel pause("rmask", hz); 510226673Smarcel continue; 511226673Smarcel } 512226673Smarcel mnt = name; 513226673Smarcel error = parse_mount(&mnt); 514226673Smarcel if (error == -1) 515226673Smarcel printf("Invalid file system specification.\n"); 516226673Smarcel } while (error != 0); 517226673Smarcel 518214006Smarcel return (error); 519214006Smarcel} 520213365Smarcel 521214006Smarcelstatic int 522214006Smarcelparse_dir_md(char **conf) 523214006Smarcel{ 524214006Smarcel struct stat sb; 525214006Smarcel struct thread *td; 526214006Smarcel struct md_ioctl *mdio; 527214006Smarcel char *path, *tok; 528214006Smarcel int error, fd, len; 529213365Smarcel 530214006Smarcel td = curthread; 531214006Smarcel 532214006Smarcel error = parse_token(conf, &tok); 533214006Smarcel if (error) 534214006Smarcel return (error); 535214006Smarcel 536214006Smarcel len = strlen(tok); 537214006Smarcel mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 538214006Smarcel path = (void *)(mdio + 1); 539214006Smarcel bcopy(tok, path, len); 540214006Smarcel free(tok, M_TEMP); 541214006Smarcel 542214006Smarcel /* Get file status. */ 543274476Skib error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 544214006Smarcel if (error) 545214006Smarcel goto out; 546214006Smarcel 547214006Smarcel /* Open /dev/mdctl so that we can attach/detach. */ 548274476Skib error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 549274476Skib O_RDWR, 0); 550214006Smarcel if (error) 551214006Smarcel goto out; 552214006Smarcel 553214006Smarcel fd = td->td_retval[0]; 554214006Smarcel mdio->md_version = MDIOVERSION; 555214006Smarcel mdio->md_type = MD_VNODE; 556214006Smarcel 557214006Smarcel if (root_mount_mddev != -1) { 558214006Smarcel mdio->md_unit = root_mount_mddev; 559214006Smarcel DROP_GIANT(); 560214006Smarcel error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 561214006Smarcel PICKUP_GIANT(); 562214006Smarcel /* Ignore errors. We don't care. */ 563214006Smarcel root_mount_mddev = -1; 564214006Smarcel } 565214006Smarcel 566214006Smarcel mdio->md_file = (void *)(mdio + 1); 567214006Smarcel mdio->md_options = MD_AUTOUNIT | MD_READONLY; 568214006Smarcel mdio->md_mediasize = sb.st_size; 569214006Smarcel mdio->md_unit = 0; 570214006Smarcel DROP_GIANT(); 571214006Smarcel error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 572214006Smarcel PICKUP_GIANT(); 573214006Smarcel if (error) 574214006Smarcel goto out; 575214006Smarcel 576214006Smarcel if (mdio->md_unit > 9) { 577214006Smarcel printf("rootmount: too many md units\n"); 578214006Smarcel mdio->md_file = NULL; 579214006Smarcel mdio->md_options = 0; 580214006Smarcel mdio->md_mediasize = 0; 581214006Smarcel DROP_GIANT(); 582214006Smarcel error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 583214006Smarcel PICKUP_GIANT(); 584214006Smarcel /* Ignore errors. We don't care. */ 585214006Smarcel error = ERANGE; 586214006Smarcel goto out; 587214006Smarcel } 588214006Smarcel 589214006Smarcel root_mount_mddev = mdio->md_unit; 590214006Smarcel printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 591214006Smarcel 592214006Smarcel error = kern_close(td, fd); 593214006Smarcel 594214006Smarcel out: 595214006Smarcel free(mdio, M_TEMP); 596214006Smarcel return (error); 597214006Smarcel} 598214006Smarcel 599214006Smarcelstatic int 600214006Smarcelparse_dir_onfail(char **conf) 601214006Smarcel{ 602214006Smarcel char *action; 603214006Smarcel int error; 604214006Smarcel 605214006Smarcel error = parse_token(conf, &action); 606214006Smarcel if (error) 607214006Smarcel return (error); 608214006Smarcel 609214006Smarcel if (!strcmp(action, "continue")) 610214006Smarcel root_mount_onfail = A_CONTINUE; 611214006Smarcel else if (!strcmp(action, "panic")) 612214006Smarcel root_mount_onfail = A_PANIC; 613214006Smarcel else if (!strcmp(action, "reboot")) 614214006Smarcel root_mount_onfail = A_REBOOT; 615214006Smarcel else if (!strcmp(action, "retry")) 616214006Smarcel root_mount_onfail = A_RETRY; 617214006Smarcel else { 618214006Smarcel printf("rootmount: %s: unknown action\n", action); 619214006Smarcel error = EINVAL; 620214006Smarcel } 621214006Smarcel 622214006Smarcel free(action, M_TEMP); 623214006Smarcel return (0); 624214006Smarcel} 625214006Smarcel 626214006Smarcelstatic int 627214006Smarcelparse_dir_timeout(char **conf) 628214006Smarcel{ 629214006Smarcel char *tok, *endtok; 630214006Smarcel long secs; 631214006Smarcel int error; 632214006Smarcel 633214006Smarcel error = parse_token(conf, &tok); 634214006Smarcel if (error) 635214006Smarcel return (error); 636214006Smarcel 637214006Smarcel secs = strtol(tok, &endtok, 0); 638214006Smarcel error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 639214006Smarcel if (!error) 640214006Smarcel root_mount_timeout = secs; 641214006Smarcel free(tok, M_TEMP); 642214006Smarcel return (error); 643214006Smarcel} 644214006Smarcel 645214006Smarcelstatic int 646214006Smarcelparse_directive(char **conf) 647214006Smarcel{ 648214006Smarcel char *dir; 649214006Smarcel int error; 650214006Smarcel 651214006Smarcel error = parse_token(conf, &dir); 652214006Smarcel if (error) 653214006Smarcel return (error); 654214006Smarcel 655214006Smarcel if (strcmp(dir, ".ask") == 0) 656214006Smarcel error = parse_dir_ask(conf); 657214006Smarcel else if (strcmp(dir, ".md") == 0) 658214006Smarcel error = parse_dir_md(conf); 659214006Smarcel else if (strcmp(dir, ".onfail") == 0) 660214006Smarcel error = parse_dir_onfail(conf); 661214006Smarcel else if (strcmp(dir, ".timeout") == 0) 662214006Smarcel error = parse_dir_timeout(conf); 663214006Smarcel else { 664214006Smarcel printf("mountroot: invalid directive `%s'\n", dir); 665214006Smarcel /* Ignore the rest of the line. */ 666214006Smarcel (void)parse_skipto(conf, '\n'); 667214006Smarcel error = EINVAL; 668214006Smarcel } 669214006Smarcel free(dir, M_TEMP); 670214006Smarcel return (error); 671214006Smarcel} 672214006Smarcel 673214006Smarcelstatic int 674214006Smarcelparse_mount_dev_present(const char *dev) 675214006Smarcel{ 676214006Smarcel struct nameidata nd; 677214006Smarcel int error; 678214006Smarcel 679214006Smarcel NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 680214006Smarcel error = namei(&nd); 681214006Smarcel if (!error) 682214006Smarcel vput(nd.ni_vp); 683214006Smarcel NDFREE(&nd, NDF_ONLY_PNBUF); 684214006Smarcel return (error != 0) ? 0 : 1; 685214006Smarcel} 686214006Smarcel 687243868Skib#define ERRMSGL 255 688214006Smarcelstatic int 689214006Smarcelparse_mount(char **conf) 690214006Smarcel{ 691243868Skib char *errmsg; 692214006Smarcel struct mntarg *ma; 693214006Smarcel char *dev, *fs, *opts, *tok; 694214006Smarcel int delay, error, timeout; 695214006Smarcel 696214006Smarcel error = parse_token(conf, &tok); 697214006Smarcel if (error) 698214006Smarcel return (error); 699214006Smarcel fs = tok; 700214006Smarcel error = parse_skipto(&tok, ':'); 701214006Smarcel if (error) { 702214006Smarcel free(fs, M_TEMP); 703214006Smarcel return (error); 704214006Smarcel } 705214006Smarcel parse_poke(&tok, '\0'); 706214006Smarcel parse_advance(&tok); 707214006Smarcel dev = tok; 708214006Smarcel 709214006Smarcel if (root_mount_mddev != -1) { 710214006Smarcel /* Handle substitution for the md unit number. */ 711214006Smarcel tok = strstr(dev, "md#"); 712214006Smarcel if (tok != NULL) 713214006Smarcel tok[2] = '0' + root_mount_mddev; 714214006Smarcel } 715214006Smarcel 716214006Smarcel /* Parse options. */ 717214006Smarcel error = parse_token(conf, &tok); 718214006Smarcel opts = (error == 0) ? tok : NULL; 719214006Smarcel 720214006Smarcel printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 721214006Smarcel (opts != NULL) ? opts : ""); 722214006Smarcel 723243868Skib errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 724214006Smarcel 725214006Smarcel if (vfs_byname(fs) == NULL) { 726255412Sdelphij strlcpy(errmsg, "unknown file system", ERRMSGL); 727214006Smarcel error = ENOENT; 728214006Smarcel goto out; 729214006Smarcel } 730214006Smarcel 731253847Sian if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL && 732253847Sian dev[0] != '\0' && !parse_mount_dev_present(dev)) { 733214006Smarcel printf("mountroot: waiting for device %s ...\n", dev); 734214006Smarcel delay = hz / 10; 735214006Smarcel timeout = root_mount_timeout * hz; 736214006Smarcel do { 737214006Smarcel pause("rmdev", delay); 738214006Smarcel timeout -= delay; 739214006Smarcel } while (timeout > 0 && !parse_mount_dev_present(dev)); 740214006Smarcel if (timeout <= 0) { 741214006Smarcel error = ENODEV; 742214006Smarcel goto out; 743214006Smarcel } 744214006Smarcel } 745214006Smarcel 746214006Smarcel ma = NULL; 747214006Smarcel ma = mount_arg(ma, "fstype", fs, -1); 748214006Smarcel ma = mount_arg(ma, "fspath", "/", -1); 749214006Smarcel ma = mount_arg(ma, "from", dev, -1); 750243868Skib ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 751214006Smarcel ma = mount_arg(ma, "ro", NULL, 0); 752214006Smarcel ma = parse_mountroot_options(ma, opts); 753214006Smarcel error = kernel_mount(ma, MNT_ROOTFS); 754214006Smarcel 755214006Smarcel out: 756214006Smarcel if (error) { 757214006Smarcel printf("Mounting from %s:%s failed with error %d", 758214006Smarcel fs, dev, error); 759214006Smarcel if (errmsg[0] != '\0') 760214006Smarcel printf(": %s", errmsg); 761214006Smarcel printf(".\n"); 762214006Smarcel } 763214006Smarcel free(fs, M_TEMP); 764243868Skib free(errmsg, M_TEMP); 765214006Smarcel if (opts != NULL) 766214006Smarcel free(opts, M_TEMP); 767214006Smarcel /* kernel_mount can return -1 on error. */ 768214006Smarcel return ((error < 0) ? EDOOFUS : error); 769214006Smarcel} 770243868Skib#undef ERRMSGL 771214006Smarcel 772214006Smarcelstatic int 773214006Smarcelvfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 774214006Smarcel{ 775214006Smarcel struct mount *mp; 776214006Smarcel char *conf; 777214006Smarcel int error; 778214006Smarcel 779214006Smarcel root_mount_mddev = -1; 780214006Smarcel 781214006Smarcelretry: 782214006Smarcel conf = sbuf_data(sb); 783214006Smarcel mp = TAILQ_NEXT(mpdevfs, mnt_list); 784214006Smarcel error = (mp == NULL) ? 0 : EDOOFUS; 785214006Smarcel root_mount_onfail = A_CONTINUE; 786214006Smarcel while (mp == NULL) { 787214006Smarcel error = parse_skipto(&conf, CC_NONWHITESPACE); 788214006Smarcel if (error == PE_EOL) { 789214006Smarcel parse_advance(&conf); 790214006Smarcel continue; 791214006Smarcel } 792214006Smarcel if (error < 0) 793214006Smarcel break; 794214006Smarcel switch (parse_peek(&conf)) { 795214006Smarcel case '#': 796214006Smarcel error = parse_skipto(&conf, '\n'); 797214006Smarcel break; 798214006Smarcel case '.': 799214006Smarcel error = parse_directive(&conf); 800214006Smarcel break; 801214006Smarcel default: 802214006Smarcel error = parse_mount(&conf); 803287190Smarcel if (error == -1) { 804287190Smarcel printf("mountroot: invalid file system " 805287190Smarcel "specification.\n"); 806287190Smarcel error = 0; 807287190Smarcel } 808214006Smarcel break; 809214006Smarcel } 810214006Smarcel if (error < 0) 811214006Smarcel break; 812214006Smarcel /* Ignore any trailing garbage on the line. */ 813214006Smarcel if (parse_peek(&conf) != '\n') { 814214006Smarcel printf("mountroot: advancing to next directive...\n"); 815214006Smarcel (void)parse_skipto(&conf, '\n'); 816214006Smarcel } 817214006Smarcel mp = TAILQ_NEXT(mpdevfs, mnt_list); 818214006Smarcel } 819214006Smarcel if (mp != NULL) 820214006Smarcel return (0); 821214006Smarcel 822213365Smarcel /* 823214006Smarcel * We failed to mount (a new) root. 824213365Smarcel */ 825214006Smarcel switch (root_mount_onfail) { 826214006Smarcel case A_CONTINUE: 827214006Smarcel break; 828214006Smarcel case A_PANIC: 829214006Smarcel panic("mountroot: unable to (re-)mount root."); 830214006Smarcel /* NOTREACHED */ 831214006Smarcel case A_RETRY: 832214006Smarcel goto retry; 833214006Smarcel case A_REBOOT: 834214006Smarcel kern_reboot(RB_NOSYNC); 835214006Smarcel /* NOTREACHED */ 836213365Smarcel } 837213365Smarcel 838214006Smarcel return (error); 839214006Smarcel} 840214006Smarcel 841214006Smarcelstatic void 842214006Smarcelvfs_mountroot_conf0(struct sbuf *sb) 843214006Smarcel{ 844214006Smarcel char *s, *tok, *mnt, *opt; 845214006Smarcel int error; 846214006Smarcel 847214006Smarcel sbuf_printf(sb, ".onfail panic\n"); 848214006Smarcel sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 849214006Smarcel if (boothowto & RB_ASKNAME) 850214006Smarcel sbuf_printf(sb, ".ask\n"); 851214006Smarcel#ifdef ROOTDEVNAME 852214006Smarcel if (boothowto & RB_DFLTROOT) 853214006Smarcel sbuf_printf(sb, "%s\n", ROOTDEVNAME); 854214006Smarcel#endif 855213365Smarcel if (boothowto & RB_CDROM) { 856217163Snwhitehorn sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 857214006Smarcel sbuf_printf(sb, ".timeout 0\n"); 858217163Snwhitehorn sbuf_printf(sb, "cd9660:/dev/acd0 ro\n"); 859214006Smarcel sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 860214006Smarcel } 861273174Sdavide s = kern_getenv("vfs.root.mountfrom"); 862214006Smarcel if (s != NULL) { 863273174Sdavide opt = kern_getenv("vfs.root.mountfrom.options"); 864214006Smarcel tok = s; 865214006Smarcel error = parse_token(&tok, &mnt); 866214006Smarcel while (!error) { 867214006Smarcel sbuf_printf(sb, "%s %s\n", mnt, 868214006Smarcel (opt != NULL) ? opt : ""); 869214006Smarcel free(mnt, M_TEMP); 870214006Smarcel error = parse_token(&tok, &mnt); 871213365Smarcel } 872214006Smarcel if (opt != NULL) 873214006Smarcel freeenv(opt); 874214006Smarcel freeenv(s); 875213365Smarcel } 876214006Smarcel if (rootdevnames[0] != NULL) 877214006Smarcel sbuf_printf(sb, "%s\n", rootdevnames[0]); 878214006Smarcel if (rootdevnames[1] != NULL) 879214006Smarcel sbuf_printf(sb, "%s\n", rootdevnames[1]); 880214006Smarcel#ifdef ROOTDEVNAME 881214006Smarcel if (!(boothowto & RB_DFLTROOT)) 882214006Smarcel sbuf_printf(sb, "%s\n", ROOTDEVNAME); 883214006Smarcel#endif 884214006Smarcel if (!(boothowto & RB_ASKNAME)) 885214006Smarcel sbuf_printf(sb, ".ask\n"); 886214006Smarcel} 887213365Smarcel 888214006Smarcelstatic int 889214006Smarcelvfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 890214006Smarcel{ 891214006Smarcel static char buf[128]; 892214006Smarcel struct nameidata nd; 893214006Smarcel off_t ofs; 894231949Skib ssize_t resid; 895241896Skib int error, flags, len; 896214006Smarcel 897241896Skib NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 898214006Smarcel flags = FREAD; 899214006Smarcel error = vn_open(&nd, &flags, 0, NULL); 900214006Smarcel if (error) 901214006Smarcel return (error); 902214006Smarcel 903214006Smarcel NDFREE(&nd, NDF_ONLY_PNBUF); 904214006Smarcel ofs = 0; 905214006Smarcel len = sizeof(buf) - 1; 906214006Smarcel while (1) { 907214006Smarcel error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 908214006Smarcel UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 909214006Smarcel NOCRED, &resid, td); 910214006Smarcel if (error) 911214006Smarcel break; 912214006Smarcel if (resid == len) 913214006Smarcel break; 914214006Smarcel buf[len - resid] = 0; 915214006Smarcel sbuf_printf(sb, "%s", buf); 916214006Smarcel ofs += len - resid; 917214006Smarcel } 918214006Smarcel 919214006Smarcel VOP_UNLOCK(nd.ni_vp, 0); 920214006Smarcel vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 921214006Smarcel return (error); 922214006Smarcel} 923214006Smarcel 924214006Smarcelstatic void 925214006Smarcelvfs_mountroot_wait(void) 926214006Smarcel{ 927214006Smarcel struct root_hold_token *h; 928214006Smarcel struct timeval lastfail; 929214006Smarcel int curfail; 930214006Smarcel 931214006Smarcel curfail = 0; 932214006Smarcel while (1) { 933214006Smarcel DROP_GIANT(); 934214006Smarcel g_waitidle(); 935214006Smarcel PICKUP_GIANT(); 936267351Smav mtx_lock(&root_holds_mtx); 937214006Smarcel if (LIST_EMPTY(&root_holds)) { 938267351Smav mtx_unlock(&root_holds_mtx); 939214006Smarcel break; 940214006Smarcel } 941214006Smarcel if (ppsratecheck(&lastfail, &curfail, 1)) { 942214006Smarcel printf("Root mount waiting for:"); 943214006Smarcel LIST_FOREACH(h, &root_holds, list) 944214006Smarcel printf(" %s", h->who); 945214006Smarcel printf("\n"); 946214006Smarcel } 947267351Smav msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 948214006Smarcel hz); 949214006Smarcel } 950214006Smarcel} 951214006Smarcel 952214006Smarcelvoid 953214006Smarcelvfs_mountroot(void) 954214006Smarcel{ 955214006Smarcel struct mount *mp; 956214006Smarcel struct sbuf *sb; 957214006Smarcel struct thread *td; 958214006Smarcel time_t timebase; 959214006Smarcel int error; 960214006Smarcel 961214006Smarcel td = curthread; 962214006Smarcel 963214006Smarcel vfs_mountroot_wait(); 964214006Smarcel 965214006Smarcel sb = sbuf_new_auto(); 966214006Smarcel vfs_mountroot_conf0(sb); 967214006Smarcel sbuf_finish(sb); 968214006Smarcel 969214006Smarcel error = vfs_mountroot_devfs(td, &mp); 970214006Smarcel while (!error) { 971214006Smarcel error = vfs_mountroot_parse(sb, mp); 972214006Smarcel if (!error) { 973288091Sbdrewery vfs_mountroot_shuffle(td, mp); 974288091Sbdrewery sbuf_clear(sb); 975288091Sbdrewery error = vfs_mountroot_readconf(td, sb); 976288091Sbdrewery sbuf_finish(sb); 977213365Smarcel } 978213365Smarcel } 979213365Smarcel 980214006Smarcel sbuf_delete(sb); 981213365Smarcel 982213365Smarcel /* 983214006Smarcel * Iterate over all currently mounted file systems and use 984214006Smarcel * the time stamp found to check and/or initialize the RTC. 985214006Smarcel * Call inittodr() only once and pass it the largest of the 986214006Smarcel * timestamps we encounter. 987213365Smarcel */ 988214006Smarcel timebase = 0; 989214006Smarcel mtx_lock(&mountlist_mtx); 990214006Smarcel mp = TAILQ_FIRST(&mountlist); 991214006Smarcel while (mp != NULL) { 992214006Smarcel if (mp->mnt_time > timebase) 993214006Smarcel timebase = mp->mnt_time; 994214006Smarcel mp = TAILQ_NEXT(mp, mnt_list); 995214006Smarcel } 996214006Smarcel mtx_unlock(&mountlist_mtx); 997214006Smarcel inittodr(timebase); 998213365Smarcel 999214006Smarcel /* Keep prison0's root in sync with the global rootvnode. */ 1000214006Smarcel mtx_lock(&prison0.pr_mtx); 1001214006Smarcel prison0.pr_root = rootvnode; 1002214006Smarcel vref(prison0.pr_root); 1003214006Smarcel mtx_unlock(&prison0.pr_mtx); 1004213365Smarcel 1005267351Smav mtx_lock(&root_holds_mtx); 1006214006Smarcel atomic_store_rel_int(&root_mount_complete, 1); 1007214006Smarcel wakeup(&root_mount_complete); 1008267351Smav mtx_unlock(&root_holds_mtx); 1009248645Savg 1010248645Savg EVENTHANDLER_INVOKE(mountroot); 1011213365Smarcel} 1012213365Smarcel 1013213365Smarcelstatic struct mntarg * 1014213365Smarcelparse_mountroot_options(struct mntarg *ma, const char *options) 1015213365Smarcel{ 1016213365Smarcel char *p; 1017213365Smarcel char *name, *name_arg; 1018213365Smarcel char *val, *val_arg; 1019213365Smarcel char *opts; 1020213365Smarcel 1021213365Smarcel if (options == NULL || options[0] == '\0') 1022213365Smarcel return (ma); 1023213365Smarcel 1024213365Smarcel p = opts = strdup(options, M_MOUNT); 1025213365Smarcel if (opts == NULL) { 1026213365Smarcel return (ma); 1027214006Smarcel } 1028213365Smarcel 1029213365Smarcel while((name = strsep(&p, ",")) != NULL) { 1030213365Smarcel if (name[0] == '\0') 1031213365Smarcel break; 1032213365Smarcel 1033213365Smarcel val = strchr(name, '='); 1034213365Smarcel if (val != NULL) { 1035213365Smarcel *val = '\0'; 1036213365Smarcel ++val; 1037213365Smarcel } 1038213365Smarcel if( strcmp(name, "rw") == 0 || 1039213365Smarcel strcmp(name, "noro") == 0) { 1040213365Smarcel /* 1041213365Smarcel * The first time we mount the root file system, 1042213365Smarcel * we need to mount 'ro', so We need to ignore 1043213365Smarcel * 'rw' and 'noro' mount options. 1044213365Smarcel */ 1045213365Smarcel continue; 1046213365Smarcel } 1047213365Smarcel name_arg = strdup(name, M_MOUNT); 1048213365Smarcel val_arg = NULL; 1049214006Smarcel if (val != NULL) 1050213365Smarcel val_arg = strdup(val, M_MOUNT); 1051213365Smarcel 1052213365Smarcel ma = mount_arg(ma, name_arg, val_arg, 1053213365Smarcel (val_arg != NULL ? -1 : 0)); 1054213365Smarcel } 1055213365Smarcel free(opts, M_MOUNT); 1056213365Smarcel return (ma); 1057213365Smarcel} 1058