vfs_mount.c revision 188150
138032Speter/*- 2111823Sgshapiro * Copyright (c) 1999-2004 Poul-Henning Kamp 364562Sgshapiro * Copyright (c) 1999 Michael Smith 438032Speter * Copyright (c) 1989, 1993 538032Speter * The Regents of the University of California. All rights reserved. 638032Speter * (c) UNIX System Laboratories, Inc. 738032Speter * All or some portions of this file are derived from material licensed 838032Speter * to the University of California by American Telephone and Telegraph 938032Speter * Co. or Unix System Laboratories, Inc. and are reproduced herein with 1038032Speter * the permission of UNIX System Laboratories, Inc. 1138032Speter * 1238032Speter * Redistribution and use in source and binary forms, with or without 1338032Speter * modification, are permitted provided that the following conditions 1464562Sgshapiro * are met: 1564562Sgshapiro * 1. Redistributions of source code must retain the above copyright 16111823Sgshapiro * notice, this list of conditions and the following disclaimer. 1738032Speter * 2. Redistributions in binary form must reproduce the above copyright 1890792Sgshapiro * notice, this list of conditions and the following disclaimer in the 1938032Speter * documentation and/or other materials provided with the distribution. 2090792Sgshapiro * 4. Neither the name of the University nor the names of its contributors 2190792Sgshapiro * may be used to endorse or promote products derived from this software 2290792Sgshapiro * without specific prior written permission. 2390792Sgshapiro * 2490792Sgshapiro * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2590792Sgshapiro * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26110560Sgshapiro * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27110560Sgshapiro * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28110560Sgshapiro * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29110560Sgshapiro * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3090792Sgshapiro * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3190792Sgshapiro * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3290792Sgshapiro * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3390792Sgshapiro * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3464562Sgshapiro * SUCH DAMAGE. 3590792Sgshapiro */ 3690792Sgshapiro 3790792Sgshapiro#include <sys/cdefs.h> 3890792Sgshapiro__FBSDID("$FreeBSD: head/sys/kern/vfs_mount.c 188150 2009-02-05 15:03:35Z attilio $"); 3990792Sgshapiro 4090792Sgshapiro#include <sys/param.h> 4190792Sgshapiro#include <sys/conf.h> 4290792Sgshapiro#include <sys/fcntl.h> 4390792Sgshapiro#include <sys/jail.h> 4490792Sgshapiro#include <sys/kernel.h> 4564562Sgshapiro#include <sys/libkern.h> 4690792Sgshapiro#include <sys/malloc.h> 4790792Sgshapiro#include <sys/mount.h> 4838032Speter#include <sys/mutex.h> 4938032Speter#include <sys/namei.h> 5038032Speter#include <sys/priv.h> 5138032Speter#include <sys/proc.h> 5238032Speter#include <sys/filedesc.h> 5338032Speter#include <sys/reboot.h> 5438032Speter#include <sys/syscallsubr.h> 5538032Speter#include <sys/sysproto.h> 5638032Speter#include <sys/sx.h> 5738032Speter#include <sys/sysctl.h> 5838032Speter#include <sys/sysent.h> 5990792Sgshapiro#include <sys/systm.h> 6090792Sgshapiro#include <sys/vnode.h> 6190792Sgshapiro#include <vm/uma.h> 6290792Sgshapiro 6338032Speter#include <geom/geom.h> 6438032Speter 6538032Speter#include <machine/stdarg.h> 6638032Speter 6738032Speter#include <security/audit/audit.h> 6890792Sgshapiro#include <security/mac/mac_framework.h> 6990792Sgshapiro 7038032Speter#include "opt_rootdevname.h" 7190792Sgshapiro#include "opt_mac.h" 7294334Sgshapiro 7394334Sgshapiro#define ROOTNAME "root_device" 7490792Sgshapiro#define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 7590792Sgshapiro 76111823Sgshapirostatic int vfs_domount(struct thread *td, const char *fstype, 7790792Sgshapiro char *fspath, int fsflags, void *fsdata); 7890792Sgshapirostatic int vfs_mountroot_ask(void); 7990792Sgshapirostatic int vfs_mountroot_try(const char *mountfrom); 8090792Sgshapirostatic void free_mntarg(struct mntarg *ma); 8190792Sgshapirostatic int vfs_getopt_pos(struct vfsoptlist *opts, const char *name); 8290792Sgshapiro 8390792Sgshapirostatic int usermount = 0; 8490792SgshapiroSYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 8590792Sgshapiro "Unprivileged users may mount and unmount file systems"); 8690792Sgshapiro 8790792SgshapiroMALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 8890792SgshapiroMALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 8990792Sgshapirostatic uma_zone_t mount_zone; 9090792Sgshapiro 9190792Sgshapiro/* List of mounted filesystems. */ 9290792Sgshapirostruct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 9390792Sgshapiro 9490792Sgshapiro/* For any iteration/modification of mountlist */ 9590792Sgshapirostruct mtx mountlist_mtx; 9690792SgshapiroMTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 9790792Sgshapiro 9890792SgshapiroTAILQ_HEAD(vfsoptlist, vfsopt); 9990792Sgshapirostruct vfsopt { 10090792Sgshapiro TAILQ_ENTRY(vfsopt) link; 10190792Sgshapiro char *name; 10290792Sgshapiro void *value; 10390792Sgshapiro int len; 10490792Sgshapiro}; 10590792Sgshapiro 10690792Sgshapiro/* 10790792Sgshapiro * The vnode of the system's root (/ in the filesystem, without chroot 10890792Sgshapiro * active.) 10990792Sgshapiro */ 11090792Sgshapirostruct vnode *rootvnode; 11190792Sgshapiro 11290792Sgshapiro/* 11390792Sgshapiro * The root filesystem is detailed in the kernel environment variable 11490792Sgshapiro * vfs.root.mountfrom, which is expected to be in the general format 11590792Sgshapiro * 11690792Sgshapiro * <vfsname>:[<path>] 11790792Sgshapiro * vfsname := the name of a VFS known to the kernel and capable 11890792Sgshapiro * of being mounted as root 11990792Sgshapiro * path := disk device name or other data used by the filesystem 12090792Sgshapiro * to locate its physical store 12190792Sgshapiro */ 12290792Sgshapiro 12394334Sgshapiro/* 12464562Sgshapiro * Global opts, taken by all filesystems 12590792Sgshapiro */ 12690792Sgshapirostatic const char *global_opts[] = { 12790792Sgshapiro "errmsg", 12890792Sgshapiro "fstype", 12990792Sgshapiro "fspath", 13064562Sgshapiro "ro", 13164562Sgshapiro "rw", 13264562Sgshapiro "nosuid", 13364562Sgshapiro "noexec", 13464562Sgshapiro NULL 135110560Sgshapiro}; 13690792Sgshapiro 13790792Sgshapiro/* 13890792Sgshapiro * The root specifiers we will try if RB_CDROM is specified. 13990792Sgshapiro */ 14090792Sgshapirostatic char *cdrom_rootdevnames[] = { 14138032Speter "cd9660:cd0", 14290792Sgshapiro "cd9660:acd0", 14390792Sgshapiro NULL 14490792Sgshapiro}; 14590792Sgshapiro 14690792Sgshapiro/* legacy find-root code */ 14790792Sgshapirochar *rootdevnames[2] = {NULL, NULL}; 14880785Sgshapiro#ifndef ROOTDEVNAME 14990792Sgshapiro# define ROOTDEVNAME NULL 15090792Sgshapiro#endif 15190792Sgshapirostatic const char *ctrootdevname = ROOTDEVNAME; 15290792Sgshapiro 15390792Sgshapiro/* 15490792Sgshapiro * --------------------------------------------------------------------- 15590792Sgshapiro * Functions for building and sanitizing the mount options 15690792Sgshapiro */ 15790792Sgshapiro 15890792Sgshapiro/* Remove one mount option. */ 15990792Sgshapirostatic void 16090792Sgshapirovfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 16190792Sgshapiro{ 16290792Sgshapiro 16390792Sgshapiro TAILQ_REMOVE(opts, opt, link); 16490792Sgshapiro free(opt->name, M_MOUNT); 16590792Sgshapiro if (opt->value != NULL) 16690792Sgshapiro free(opt->value, M_MOUNT); 16790792Sgshapiro#ifdef INVARIANTS 16890792Sgshapiro else if (opt->len != 0) 16990792Sgshapiro panic("%s: mount option with NULL value but length != 0", 17090792Sgshapiro __func__); 17190792Sgshapiro#endif 17290792Sgshapiro free(opt, M_MOUNT); 17390792Sgshapiro} 17490792Sgshapiro 17590792Sgshapiro/* Release all resources related to the mount options. */ 17690792Sgshapirovoid 17790792Sgshapirovfs_freeopts(struct vfsoptlist *opts) 17890792Sgshapiro{ 17990792Sgshapiro struct vfsopt *opt; 18090792Sgshapiro 18190792Sgshapiro while (!TAILQ_EMPTY(opts)) { 18290792Sgshapiro opt = TAILQ_FIRST(opts); 18390792Sgshapiro vfs_freeopt(opts, opt); 18490792Sgshapiro } 18590792Sgshapiro free(opts, M_MOUNT); 18690792Sgshapiro} 18790792Sgshapiro 18890792Sgshapirovoid 18990792Sgshapirovfs_deleteopt(struct vfsoptlist *opts, const char *name) 19090792Sgshapiro{ 19190792Sgshapiro struct vfsopt *opt, *temp; 19290792Sgshapiro 19390792Sgshapiro if (opts == NULL) 19490792Sgshapiro return; 19590792Sgshapiro TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 19690792Sgshapiro if (strcmp(opt->name, name) == 0) 19790792Sgshapiro vfs_freeopt(opts, opt); 19890792Sgshapiro } 19990792Sgshapiro} 200110560Sgshapiro 20190792Sgshapiro/* 20290792Sgshapiro * Check if options are equal (with or without the "no" prefix). 20390792Sgshapiro */ 20490792Sgshapirostatic int 20590792Sgshapirovfs_equalopts(const char *opt1, const char *opt2) 20690792Sgshapiro{ 20790792Sgshapiro 20890792Sgshapiro /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 20990792Sgshapiro if (strcmp(opt1, opt2) == 0) 21090792Sgshapiro return (1); 21190792Sgshapiro /* "noopt" vs. "opt" */ 21290792Sgshapiro if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 21390792Sgshapiro return (1); 21490792Sgshapiro /* "opt" vs. "noopt" */ 21590792Sgshapiro if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 21690792Sgshapiro return (1); 21790792Sgshapiro return (0); 21890792Sgshapiro} 21990792Sgshapiro 22090792Sgshapiro/* 22190792Sgshapiro * If a mount option is specified several times, 22290792Sgshapiro * (with or without the "no" prefix) only keep 22390792Sgshapiro * the last occurence of it. 22490792Sgshapiro */ 22590792Sgshapirostatic void 22690792Sgshapirovfs_sanitizeopts(struct vfsoptlist *opts) 22790792Sgshapiro{ 22890792Sgshapiro struct vfsopt *opt, *opt2, *tmp; 22990792Sgshapiro 23090792Sgshapiro TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 23190792Sgshapiro opt2 = TAILQ_PREV(opt, vfsoptlist, link); 23290792Sgshapiro while (opt2 != NULL) { 23390792Sgshapiro if (vfs_equalopts(opt->name, opt2->name)) { 23490792Sgshapiro tmp = TAILQ_PREV(opt2, vfsoptlist, link); 23590792Sgshapiro vfs_freeopt(opts, opt2); 23690792Sgshapiro opt2 = tmp; 23790792Sgshapiro } else { 23890792Sgshapiro opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 23990792Sgshapiro } 24090792Sgshapiro } 24190792Sgshapiro } 24290792Sgshapiro} 24390792Sgshapiro 24490792Sgshapiro/* 24590792Sgshapiro * Build a linked list of mount options from a struct uio. 24690792Sgshapiro */ 24790792Sgshapirostatic int 24890792Sgshapirovfs_buildopts(struct uio *auio, struct vfsoptlist **options) 24990792Sgshapiro{ 25090792Sgshapiro struct vfsoptlist *opts; 25190792Sgshapiro struct vfsopt *opt; 25290792Sgshapiro size_t memused; 25390792Sgshapiro unsigned int i, iovcnt; 25490792Sgshapiro int error, namelen, optlen; 25590792Sgshapiro 25690792Sgshapiro opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 25790792Sgshapiro TAILQ_INIT(opts); 258110560Sgshapiro memused = 0; 25990792Sgshapiro iovcnt = auio->uio_iovcnt; 26090792Sgshapiro for (i = 0; i < iovcnt; i += 2) { 26190792Sgshapiro opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 26290792Sgshapiro namelen = auio->uio_iov[i].iov_len; 26390792Sgshapiro optlen = auio->uio_iov[i + 1].iov_len; 26490792Sgshapiro opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 26590792Sgshapiro opt->value = NULL; 26690792Sgshapiro opt->len = 0; 26790792Sgshapiro 26890792Sgshapiro /* 269110560Sgshapiro * Do this early, so jumps to "bad" will free the current 27090792Sgshapiro * option. 27180785Sgshapiro */ 27280785Sgshapiro TAILQ_INSERT_TAIL(opts, opt, link); 27380785Sgshapiro memused += sizeof(struct vfsopt) + optlen + namelen; 27480785Sgshapiro 27580785Sgshapiro /* 27680785Sgshapiro * Avoid consuming too much memory, and attempts to overflow 27790792Sgshapiro * memused. 27880785Sgshapiro */ 27980785Sgshapiro if (memused > VFS_MOUNTARG_SIZE_MAX || 28090792Sgshapiro optlen > VFS_MOUNTARG_SIZE_MAX || 28180785Sgshapiro namelen > VFS_MOUNTARG_SIZE_MAX) { 28280785Sgshapiro error = EINVAL; 28380785Sgshapiro goto bad; 28480785Sgshapiro } 28598841Sgshapiro 28680785Sgshapiro if (auio->uio_segflg == UIO_SYSSPACE) { 28780785Sgshapiro bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 28890792Sgshapiro } else { 28980785Sgshapiro error = copyin(auio->uio_iov[i].iov_base, opt->name, 29090792Sgshapiro namelen); 29180785Sgshapiro if (error) 29280785Sgshapiro goto bad; 29380785Sgshapiro } 29480785Sgshapiro /* Ensure names are null-terminated strings. */ 29590792Sgshapiro if (opt->name[namelen - 1] != '\0') { 29690792Sgshapiro error = EINVAL; 29780785Sgshapiro goto bad; 29890792Sgshapiro } 29980785Sgshapiro if (optlen != 0) { 30080785Sgshapiro opt->len = optlen; 30180785Sgshapiro opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 30280785Sgshapiro if (auio->uio_segflg == UIO_SYSSPACE) { 30390792Sgshapiro bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 30438032Speter optlen); 30538032Speter } else { 30638032Speter error = copyin(auio->uio_iov[i + 1].iov_base, 30738032Speter opt->value, optlen); 30890792Sgshapiro if (error) 30990792Sgshapiro goto bad; 31038032Speter } 31138032Speter } 31238032Speter } 31338032Speter vfs_sanitizeopts(opts); 31438032Speter *options = opts; 31590792Sgshapiro return (0); 31638032Speterbad: 31738032Speter vfs_freeopts(opts); 31838032Speter return (error); 31938032Speter} 32090792Sgshapiro 32138032Speter/* 32238032Speter * Merge the old mount options with the new ones passed 32390792Sgshapiro * in the MNT_UPDATE case. 32438032Speter * 32590792Sgshapiro * XXX This function will keep a "nofoo" option in the 32638032Speter * new options if there is no matching "foo" option 32738032Speter * to be cancelled in the old options. This is a bug 32864562Sgshapiro * if the option's canonical name is "foo". E.g., "noro" 32938032Speter * shouldn't end up in the mount point's active options, 33038032Speter * but it can. 33138032Speter */ 33238032Speterstatic void 33338032Spetervfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 33490792Sgshapiro{ 33564562Sgshapiro struct vfsopt *opt, *opt2, *new; 33690792Sgshapiro 33738032Speter TAILQ_FOREACH(opt, opts, link) { 33838032Speter /* 33938032Speter * Check that this option hasn't been redefined 34038032Speter * nor cancelled with a "no" mount option. 34138032Speter */ 34238032Speter opt2 = TAILQ_FIRST(toopts); 34338032Speter while (opt2 != NULL) { 34490792Sgshapiro if (strcmp(opt2->name, opt->name) == 0) 34538032Speter goto next; 34638032Speter if (strncmp(opt2->name, "no", 2) == 0 && 34790792Sgshapiro strcmp(opt2->name + 2, opt->name) == 0) { 34838032Speter vfs_freeopt(toopts, opt2); 34990792Sgshapiro goto next; 35038032Speter } 35138032Speter opt2 = TAILQ_NEXT(opt2, link); 35290792Sgshapiro } 35364562Sgshapiro /* We want this option, duplicate it. */ 35438032Speter new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 35538032Speter new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 35638032Speter strcpy(new->name, opt->name); 35764562Sgshapiro if (opt->len != 0) { 35838032Speter new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 35990792Sgshapiro bcopy(opt->value, new->value, opt->len); 36064562Sgshapiro } else { 36164562Sgshapiro new->value = NULL; 36264562Sgshapiro } 36364562Sgshapiro new->len = opt->len; 36464562Sgshapiro TAILQ_INSERT_TAIL(toopts, new, link); 36564562Sgshapironext: 36664562Sgshapiro continue; 36764562Sgshapiro } 36864562Sgshapiro} 36964562Sgshapiro 37064562Sgshapiro/* 37164562Sgshapiro * Mount a filesystem. 37264562Sgshapiro */ 37364562Sgshapiroint 37498121Sgshapironmount(td, uap) 37590792Sgshapiro struct thread *td; 37664562Sgshapiro struct nmount_args /* { 37738032Speter struct iovec *iovp; 37864562Sgshapiro unsigned int iovcnt; 37938032Speter int flags; 38064562Sgshapiro } */ *uap; 38138032Speter{ 38238032Speter struct uio *auio; 38338032Speter struct iovec *iov; 38464562Sgshapiro unsigned int i; 38590792Sgshapiro int error; 38664562Sgshapiro u_int iovcnt; 38764562Sgshapiro 38864562Sgshapiro AUDIT_ARG(fflags, uap->flags); 38964562Sgshapiro CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 39064562Sgshapiro uap->iovp, uap->iovcnt, uap->flags); 39138032Speter 39238032Speter /* 39338032Speter * Filter out MNT_ROOTFS. We do not want clients of nmount() in 39438032Speter * userspace to set this flag, but we must filter it out if we want 39538032Speter * MNT_UPDATE on the root file system to work. 39664562Sgshapiro * MNT_ROOTFS should only be set in the kernel in vfs_mountroot_try(). 39738032Speter */ 39838032Speter uap->flags &= ~MNT_ROOTFS; 39964562Sgshapiro 40038032Speter iovcnt = uap->iovcnt; 40190792Sgshapiro /* 40290792Sgshapiro * Check that we have an even number of iovec's 40390792Sgshapiro * and that we have at least two options. 40438032Speter */ 40564562Sgshapiro if ((iovcnt & 1) || (iovcnt < 4)) { 40664562Sgshapiro CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 40790792Sgshapiro uap->iovcnt); 40864562Sgshapiro return (EINVAL); 40938032Speter } 41098121Sgshapiro 41138032Speter error = copyinuio(uap->iovp, iovcnt, &auio); 41238032Speter if (error) { 41338032Speter CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 41438032Speter __func__, error); 41590792Sgshapiro return (error); 41690792Sgshapiro } 41790792Sgshapiro iov = auio->uio_iov; 41890792Sgshapiro for (i = 0; i < iovcnt; i++) { 41938032Speter if (iov->iov_len > MMAXOPTIONLEN) { 42038032Speter free(auio, M_IOV); 42190792Sgshapiro CTR1(KTR_VFS, "%s: failed for invalid new auio", 42238032Speter __func__); 42338032Speter return (EINVAL); 42438032Speter } 42538032Speter iov++; 42690792Sgshapiro } 42790792Sgshapiro error = vfs_donmount(td, uap->flags, auio); 42838032Speter 42938032Speter free(auio, M_IOV); 43038032Speter return (error); 43190792Sgshapiro} 43290792Sgshapiro 43390792Sgshapiro/* 43438032Speter * --------------------------------------------------------------------- 43590792Sgshapiro * Various utility functions 43638032Speter */ 43790792Sgshapiro 43890792Sgshapirovoid 43938032Spetervfs_ref(struct mount *mp) 44038032Speter{ 44138032Speter 44238032Speter CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 44338032Speter MNT_ILOCK(mp); 44438032Speter MNT_REF(mp); 44590792Sgshapiro MNT_IUNLOCK(mp); 44664562Sgshapiro} 44738032Speter 44890792Sgshapirovoid 44990792Sgshapirovfs_rel(struct mount *mp) 45090792Sgshapiro{ 45190792Sgshapiro 45290792Sgshapiro CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 45364562Sgshapiro MNT_ILOCK(mp); 45498121Sgshapiro MNT_REL(mp); 45590792Sgshapiro MNT_IUNLOCK(mp); 45690792Sgshapiro} 45790792Sgshapiro 45890792Sgshapirostatic int 45990792Sgshapiromount_init(void *mem, int size, int flags) 46090792Sgshapiro{ 46190792Sgshapiro struct mount *mp; 46290792Sgshapiro 46390792Sgshapiro mp = (struct mount *)mem; 46490792Sgshapiro mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 46590792Sgshapiro lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 46690792Sgshapiro return (0); 46790792Sgshapiro} 46890792Sgshapiro 46990792Sgshapirostatic void 47090792Sgshapiromount_fini(void *mem, int size) 47190792Sgshapiro{ 47290792Sgshapiro struct mount *mp; 47390792Sgshapiro 47464562Sgshapiro mp = (struct mount *)mem; 47564562Sgshapiro lockdestroy(&mp->mnt_explock); 47664562Sgshapiro mtx_destroy(&mp->mnt_mtx); 47764562Sgshapiro} 47890792Sgshapiro 47990792Sgshapiro/* 48038032Speter * Allocate and initialize the mount point struct. 48138032Speter */ 48290792Sgshapirostruct mount * 48390792Sgshapirovfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 48464562Sgshapiro struct ucred *cred) 48564562Sgshapiro{ 48690792Sgshapiro struct mount *mp; 48790792Sgshapiro 48890792Sgshapiro mp = uma_zalloc(mount_zone, M_WAITOK); 48990792Sgshapiro bzero(&mp->mnt_startzero, 49090792Sgshapiro __rangeof(struct mount, mnt_startzero, mnt_endzero)); 49190792Sgshapiro TAILQ_INIT(&mp->mnt_nvnodelist); 49290792Sgshapiro mp->mnt_nvnodelistsize = 0; 49390792Sgshapiro mp->mnt_ref = 0; 49438032Speter (void) vfs_busy(mp, MBF_NOWAIT); 49598121Sgshapiro mp->mnt_op = vfsp->vfc_vfsops; 49664562Sgshapiro mp->mnt_vfc = vfsp; 49738032Speter vfsp->vfc_refcount++; /* XXX Unlocked */ 49838032Speter mp->mnt_stat.f_type = vfsp->vfc_typenum; 49938032Speter mp->mnt_gen++; 50038032Speter strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 50190792Sgshapiro mp->mnt_vnodecovered = vp; 50238032Speter mp->mnt_cred = crdup(cred); 50338032Speter mp->mnt_stat.f_owner = cred->cr_uid; 50464562Sgshapiro strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 50538032Speter mp->mnt_iosize_max = DFLTPHYS; 50638032Speter#ifdef MAC 50738032Speter mac_mount_init(mp); 50890792Sgshapiro mac_mount_create(cred, mp); 50990792Sgshapiro#endif 51090792Sgshapiro arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 51190792Sgshapiro return (mp); 51290792Sgshapiro} 51390792Sgshapiro 51490792Sgshapiro/* 51590792Sgshapiro * Destroy the mount struct previously allocated by vfs_mount_alloc(). 51690792Sgshapiro */ 51790792Sgshapirovoid 51890792Sgshapirovfs_mount_destroy(struct mount *mp) 51990792Sgshapiro{ 52090792Sgshapiro 52190792Sgshapiro MNT_ILOCK(mp); 52290792Sgshapiro mp->mnt_kern_flag |= MNTK_REFEXPIRE; 52390792Sgshapiro if (mp->mnt_kern_flag & MNTK_MWAIT) { 52490792Sgshapiro mp->mnt_kern_flag &= ~MNTK_MWAIT; 52590792Sgshapiro wakeup(mp); 52690792Sgshapiro } 52790792Sgshapiro while (mp->mnt_ref) 52864562Sgshapiro msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 52998121Sgshapiro KASSERT(mp->mnt_ref == 0, 53038032Speter ("%s: invalid refcount in the drain path @ %s:%d", __func__, 53138032Speter __FILE__, __LINE__)); 53238032Speter if (mp->mnt_writeopcount != 0) 53338032Speter panic("vfs_mount_destroy: nonzero writeopcount"); 53438032Speter if (mp->mnt_secondary_writes != 0) 53538032Speter panic("vfs_mount_destroy: nonzero secondary_writes"); 53690792Sgshapiro mp->mnt_vfc->vfc_refcount--; 53738032Speter if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 53838032Speter struct vnode *vp; 53938032Speter 54090792Sgshapiro TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 54138032Speter vprint("", vp); 54238032Speter panic("unmount: dangling vnode"); 54390792Sgshapiro } 54438032Speter if (mp->mnt_nvnodelistsize != 0) 54538032Speter panic("vfs_mount_destroy: nonzero nvnodelistsize"); 54690792Sgshapiro if (mp->mnt_lockref != 0) 54790792Sgshapiro panic("vfs_mount_destroy: nonzero lock refcount"); 54890792Sgshapiro MNT_IUNLOCK(mp); 54990792Sgshapiro#ifdef MAC 55064562Sgshapiro mac_mount_destroy(mp); 55164562Sgshapiro#endif 55264562Sgshapiro if (mp->mnt_opt != NULL) 55364562Sgshapiro vfs_freeopts(mp->mnt_opt); 55490792Sgshapiro crfree(mp->mnt_cred); 55590792Sgshapiro uma_zfree(mount_zone, mp); 55690792Sgshapiro} 55738032Speter 55838032Speterint 55990792Sgshapirovfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 56038032Speter{ 56138032Speter struct vfsoptlist *optlist; 56290792Sgshapiro struct vfsopt *opt, *noro_opt, *tmp_opt; 56338032Speter char *fstype, *fspath, *errmsg; 56490792Sgshapiro int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 56590792Sgshapiro int has_rw, has_noro; 56690792Sgshapiro 56790792Sgshapiro errmsg = fspath = NULL; 56890792Sgshapiro errmsg_len = has_noro = has_rw = fspathlen = 0; 56990792Sgshapiro errmsg_pos = -1; 57090792Sgshapiro 57190792Sgshapiro error = vfs_buildopts(fsoptions, &optlist); 57290792Sgshapiro if (error) 57390792Sgshapiro return (error); 57490792Sgshapiro 57538032Speter if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 57638032Speter errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 57738032Speter 57838032Speter /* 57990792Sgshapiro * We need these two options before the others, 58090792Sgshapiro * and they are mandatory for any filesystem. 58190792Sgshapiro * Ensure they are NUL terminated as well. 58290792Sgshapiro */ 58338032Speter fstypelen = 0; 58438032Speter error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 58538032Speter if (error || fstype[fstypelen - 1] != '\0') { 58638032Speter error = EINVAL; 58790792Sgshapiro if (errmsg != NULL) 58890792Sgshapiro strncpy(errmsg, "Invalid fstype", errmsg_len); 58938032Speter goto bail; 59090792Sgshapiro } 59190792Sgshapiro fspathlen = 0; 59290792Sgshapiro error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 59390792Sgshapiro if (error || fspath[fspathlen - 1] != '\0') { 59490792Sgshapiro error = EINVAL; 59590792Sgshapiro if (errmsg != NULL) 59638032Speter strncpy(errmsg, "Invalid fspath", errmsg_len); 59738032Speter goto bail; 59838032Speter } 59990792Sgshapiro 60090792Sgshapiro /* 60138032Speter * We need to see if we have the "update" option 60238032Speter * before we call vfs_domount(), since vfs_domount() has special 60338032Speter * logic based on MNT_UPDATE. This is very important 60438032Speter * when we want to update the root filesystem. 60538032Speter */ 60638032Speter TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 60738032Speter if (strcmp(opt->name, "update") == 0) { 60838032Speter fsflags |= MNT_UPDATE; 60938032Speter vfs_freeopt(optlist, opt); 61038032Speter } 61138032Speter else if (strcmp(opt->name, "async") == 0) 61238032Speter fsflags |= MNT_ASYNC; 61338032Speter else if (strcmp(opt->name, "force") == 0) { 61438032Speter fsflags |= MNT_FORCE; 61538032Speter vfs_freeopt(optlist, opt); 61690792Sgshapiro } 61790792Sgshapiro else if (strcmp(opt->name, "reload") == 0) { 61838032Speter fsflags |= MNT_RELOAD; 61938032Speter vfs_freeopt(optlist, opt); 62090792Sgshapiro } 62138032Speter else if (strcmp(opt->name, "multilabel") == 0) 62264562Sgshapiro fsflags |= MNT_MULTILABEL; 62390792Sgshapiro else if (strcmp(opt->name, "noasync") == 0) 62438032Speter fsflags &= ~MNT_ASYNC; 62538032Speter else if (strcmp(opt->name, "noatime") == 0) 62638032Speter fsflags |= MNT_NOATIME; 62738032Speter else if (strcmp(opt->name, "atime") == 0) { 62838032Speter free(opt->name, M_MOUNT); 62938032Speter opt->name = strdup("nonoatime", M_MOUNT); 63090792Sgshapiro } 63190792Sgshapiro else if (strcmp(opt->name, "noclusterr") == 0) 63238032Speter fsflags |= MNT_NOCLUSTERR; 63338032Speter else if (strcmp(opt->name, "clusterr") == 0) { 63438032Speter free(opt->name, M_MOUNT); 63590792Sgshapiro opt->name = strdup("nonoclusterr", M_MOUNT); 63690792Sgshapiro } 63738032Speter else if (strcmp(opt->name, "noclusterw") == 0) 63864562Sgshapiro fsflags |= MNT_NOCLUSTERW; 63964562Sgshapiro else if (strcmp(opt->name, "clusterw") == 0) { 64090792Sgshapiro free(opt->name, M_MOUNT); 64190792Sgshapiro opt->name = strdup("nonoclusterw", M_MOUNT); 64290792Sgshapiro } 64390792Sgshapiro else if (strcmp(opt->name, "noexec") == 0) 64490792Sgshapiro fsflags |= MNT_NOEXEC; 64564562Sgshapiro else if (strcmp(opt->name, "exec") == 0) { 64638032Speter free(opt->name, M_MOUNT); 64738032Speter opt->name = strdup("nonoexec", M_MOUNT); 64838032Speter } 64938032Speter else if (strcmp(opt->name, "nosuid") == 0) 65064562Sgshapiro fsflags |= MNT_NOSUID; 65138032Speter else if (strcmp(opt->name, "suid") == 0) { 65264562Sgshapiro free(opt->name, M_MOUNT); 65390792Sgshapiro opt->name = strdup("nonosuid", M_MOUNT); 65490792Sgshapiro } 65590792Sgshapiro else if (strcmp(opt->name, "nosymfollow") == 0) 65690792Sgshapiro fsflags |= MNT_NOSYMFOLLOW; 65790792Sgshapiro else if (strcmp(opt->name, "symfollow") == 0) { 65890792Sgshapiro free(opt->name, M_MOUNT); 65938032Speter opt->name = strdup("nonosymfollow", M_MOUNT); 66038032Speter } 66190792Sgshapiro else if (strcmp(opt->name, "noro") == 0) { 66290792Sgshapiro fsflags &= ~MNT_RDONLY; 66390792Sgshapiro has_noro = 1; 66490792Sgshapiro } 66590792Sgshapiro else if (strcmp(opt->name, "rw") == 0) { 66690792Sgshapiro fsflags &= ~MNT_RDONLY; 66790792Sgshapiro has_rw = 1; 66890792Sgshapiro } 66938032Speter else if (strcmp(opt->name, "ro") == 0) 67090792Sgshapiro fsflags |= MNT_RDONLY; 67138032Speter else if (strcmp(opt->name, "rdonly") == 0) { 67290792Sgshapiro free(opt->name, M_MOUNT); 67338032Speter opt->name = strdup("ro", M_MOUNT); 67490792Sgshapiro fsflags |= MNT_RDONLY; 67538032Speter } 67690792Sgshapiro else if (strcmp(opt->name, "suiddir") == 0) 67738032Speter fsflags |= MNT_SUIDDIR; 67890792Sgshapiro else if (strcmp(opt->name, "sync") == 0) 67971345Sgshapiro fsflags |= MNT_SYNCHRONOUS; 68071345Sgshapiro else if (strcmp(opt->name, "union") == 0) 68190792Sgshapiro fsflags |= MNT_UNION; 68290792Sgshapiro } 68390792Sgshapiro 68490792Sgshapiro /* 68538032Speter * If "rw" was specified as a mount option, and we 68638032Speter * are trying to update a mount-point from "ro" to "rw", 68790792Sgshapiro * we need a mount option "noro", since in vfs_mergeopts(), 68890792Sgshapiro * "noro" will cancel "ro", but "rw" will not do anything. 68990792Sgshapiro */ 69090792Sgshapiro if (has_rw && !has_noro) { 69190792Sgshapiro noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 69290792Sgshapiro noro_opt->name = strdup("noro", M_MOUNT); 69390792Sgshapiro noro_opt->value = NULL; 69438032Speter noro_opt->len = 0; 69590792Sgshapiro TAILQ_INSERT_TAIL(optlist, noro_opt, link); 69638032Speter } 69764562Sgshapiro 69890792Sgshapiro /* 69938032Speter * Be ultra-paranoid about making sure the type and fspath 70038032Speter * variables will fit in our mp buffers, including the 70138032Speter * terminating NUL. 70238032Speter */ 70390792Sgshapiro if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 70490792Sgshapiro error = ENAMETOOLONG; 70538032Speter goto bail; 70638032Speter } 70738032Speter 70838032Speter mtx_lock(&Giant); 70938032Speter error = vfs_domount(td, fstype, fspath, fsflags, optlist); 71038032Speter mtx_unlock(&Giant); 71138032Speterbail: 71238032Speter /* copyout the errmsg */ 71338032Speter if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 71438032Speter && errmsg_len > 0 && errmsg != NULL) { 71538032Speter if (fsoptions->uio_segflg == UIO_SYSSPACE) { 71638032Speter bcopy(errmsg, 71738032Speter fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 71864562Sgshapiro fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 71938032Speter } else { 72038032Speter copyout(errmsg, 72138032Speter fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 72264562Sgshapiro fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 72338032Speter } 72438032Speter } 72538032Speter 72690792Sgshapiro if (error != 0) 72738032Speter vfs_freeopts(optlist); 72838032Speter return (error); 72943730Speter} 73038032Speter 73138032Speter/* 73238032Speter * Old mount API. 73364562Sgshapiro */ 73464562Sgshapiro#ifndef _SYS_SYSPROTO_H_ 73538032Speterstruct mount_args { 73638032Speter char *type; 73738032Speter char *path; 73838032Speter int flags; 73938032Speter caddr_t data; 74038032Speter}; 74138032Speter#endif 74238032Speter/* ARGSUSED */ 74338032Speterint 74438032Spetermount(td, uap) 74538032Speter struct thread *td; 74690792Sgshapiro struct mount_args /* { 74738032Speter char *type; 74864562Sgshapiro char *path; 74964562Sgshapiro int flags; 75038032Speter caddr_t data; 75164562Sgshapiro } */ *uap; 75290792Sgshapiro{ 75390792Sgshapiro char *fstype; 75490792Sgshapiro struct vfsconf *vfsp = NULL; 75564562Sgshapiro struct mntarg *ma = NULL; 75690792Sgshapiro int error; 75790792Sgshapiro 75864562Sgshapiro AUDIT_ARG(fflags, uap->flags); 75964562Sgshapiro 76064562Sgshapiro /* 76164562Sgshapiro * Filter out MNT_ROOTFS. We do not want clients of mount() in 76238032Speter * userspace to set this flag, but we must filter it out if we want 76338032Speter * MNT_UPDATE on the root file system to work. 76464562Sgshapiro * MNT_ROOTFS should only be set in the kernel in vfs_mountroot_try(). 76538032Speter */ 76638032Speter uap->flags &= ~MNT_ROOTFS; 76790792Sgshapiro 76890792Sgshapiro fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 76938032Speter error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 77090792Sgshapiro if (error) { 77138032Speter free(fstype, M_TEMP); 77238032Speter return (error); 77364562Sgshapiro } 77464562Sgshapiro 77538032Speter AUDIT_ARG(text, fstype); 77690792Sgshapiro mtx_lock(&Giant); 77790792Sgshapiro vfsp = vfs_byname_kld(fstype, td, &error); 77890792Sgshapiro free(fstype, M_TEMP); 77938032Speter if (vfsp == NULL) { 78064562Sgshapiro mtx_unlock(&Giant); 78164562Sgshapiro return (ENOENT); 78238032Speter } 78338032Speter if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 78490792Sgshapiro mtx_unlock(&Giant); 78538032Speter return (EOPNOTSUPP); 78638032Speter } 78738032Speter 78838032Speter ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 78990792Sgshapiro ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 79038032Speter ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 79138032Speter ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 79238032Speter ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 79338032Speter 79438032Speter error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags, td); 79538032Speter mtx_unlock(&Giant); 79638032Speter return (error); 79790792Sgshapiro} 79890792Sgshapiro 79990792Sgshapiro 80090792Sgshapiro/* 80138032Speter * vfs_domount(): actually attempt a filesystem mount. 80238032Speter */ 80338032Speterstatic int 80438032Spetervfs_domount( 80538032Speter struct thread *td, /* Calling thread. */ 80638032Speter const char *fstype, /* Filesystem type. */ 80738032Speter char *fspath, /* Mount path. */ 80838032Speter int fsflags, /* Flags common to all filesystems. */ 80938032Speter void *fsdata /* Options local to the filesystem. */ 81038032Speter ) 81190792Sgshapiro{ 81238032Speter struct vnode *vp; 81390792Sgshapiro struct mount *mp; 81490792Sgshapiro struct vfsconf *vfsp; 81590792Sgshapiro struct oexport_args oexport; 81690792Sgshapiro struct export_args export; 81790792Sgshapiro int error, flag = 0; 81838032Speter struct vattr va; 81938032Speter struct nameidata nd; 82038032Speter 82138032Speter mtx_assert(&Giant, MA_OWNED); 82238032Speter /* 82338032Speter * Be ultra-paranoid about making sure the type and fspath 82438032Speter * variables will fit in our mp buffers, including the 82538032Speter * terminating NUL. 82638032Speter */ 82790792Sgshapiro if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 82890792Sgshapiro return (ENAMETOOLONG); 82990792Sgshapiro 83090792Sgshapiro if (jailed(td->td_ucred) || usermount == 0) { 83190792Sgshapiro if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 83290792Sgshapiro return (error); 83390792Sgshapiro } 83438032Speter 83538032Speter /* 83698121Sgshapiro * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 83790792Sgshapiro */ 83890792Sgshapiro if (fsflags & MNT_EXPORTED) { 83990792Sgshapiro error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 84090792Sgshapiro if (error) 84190792Sgshapiro return (error); 84290792Sgshapiro } 84390792Sgshapiro if (fsflags & MNT_SUIDDIR) { 84490792Sgshapiro error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 84590792Sgshapiro if (error) 84690792Sgshapiro return (error); 84790792Sgshapiro } 84890792Sgshapiro /* 84990792Sgshapiro * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 85090792Sgshapiro */ 85190792Sgshapiro if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 85290792Sgshapiro if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 85390792Sgshapiro fsflags |= MNT_NOSUID | MNT_USER; 85490792Sgshapiro } 85590792Sgshapiro 85690792Sgshapiro /* Load KLDs before we lock the covered vnode to avoid reversals. */ 85790792Sgshapiro vfsp = NULL; 85890792Sgshapiro if ((fsflags & MNT_UPDATE) == 0) { 85990792Sgshapiro /* Don't try to load KLDs if we're mounting the root. */ 86090792Sgshapiro if (fsflags & MNT_ROOTFS) 86190792Sgshapiro vfsp = vfs_byname(fstype); 86290792Sgshapiro else 86390792Sgshapiro vfsp = vfs_byname_kld(fstype, td, &error); 86490792Sgshapiro if (vfsp == NULL) 86590792Sgshapiro return (ENODEV); 86690792Sgshapiro if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 86790792Sgshapiro return (EPERM); 86890792Sgshapiro } 86964562Sgshapiro /* 87090792Sgshapiro * Get vnode to be covered 87190792Sgshapiro */ 87290792Sgshapiro NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE, 87364562Sgshapiro fspath, td); 87464562Sgshapiro if ((error = namei(&nd)) != 0) 87590792Sgshapiro return (error); 87690792Sgshapiro NDFREE(&nd, NDF_ONLY_PNBUF); 87790792Sgshapiro vp = nd.ni_vp; 87890792Sgshapiro if (fsflags & MNT_UPDATE) { 87990792Sgshapiro if ((vp->v_vflag & VV_ROOT) == 0) { 88090792Sgshapiro vput(vp); 88190792Sgshapiro return (EINVAL); 88290792Sgshapiro } 88390792Sgshapiro mp = vp->v_mount; 88490792Sgshapiro MNT_ILOCK(mp); 88564562Sgshapiro flag = mp->mnt_flag; 88690792Sgshapiro /* 88738032Speter * We only allow the filesystem to be reloaded if it 88890792Sgshapiro * is currently mounted read-only. 88938032Speter */ 89090792Sgshapiro if ((fsflags & MNT_RELOAD) && 89190792Sgshapiro ((mp->mnt_flag & MNT_RDONLY) == 0)) { 89290792Sgshapiro MNT_IUNLOCK(mp); 89390792Sgshapiro vput(vp); 89438032Speter return (EOPNOTSUPP); /* Needs translation */ 89538032Speter } 89690792Sgshapiro MNT_IUNLOCK(mp); 89790792Sgshapiro /* 89890792Sgshapiro * Only privileged root, or (if MNT_USER is set) the user that 89990792Sgshapiro * did the original mount is permitted to update it. 90090792Sgshapiro */ 90190792Sgshapiro error = vfs_suser(mp, td); 90290792Sgshapiro if (error) { 90390792Sgshapiro vput(vp); 90490792Sgshapiro return (error); 90590792Sgshapiro } 90638032Speter if (vfs_busy(mp, MBF_NOWAIT)) { 90738032Speter vput(vp); 90838032Speter return (EBUSY); 90938032Speter } 91090792Sgshapiro VI_LOCK(vp); 91138032Speter if ((vp->v_iflag & VI_MOUNT) != 0 || 91238032Speter vp->v_mountedhere != NULL) { 91338032Speter VI_UNLOCK(vp); 91490792Sgshapiro vfs_unbusy(mp); 91590792Sgshapiro vput(vp); 91690792Sgshapiro return (EBUSY); 91790792Sgshapiro } 91890792Sgshapiro vp->v_iflag |= VI_MOUNT; 91990792Sgshapiro VI_UNLOCK(vp); 92090792Sgshapiro MNT_ILOCK(mp); 92190792Sgshapiro mp->mnt_flag |= fsflags & 92290792Sgshapiro (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS); 92390792Sgshapiro MNT_IUNLOCK(mp); 92490792Sgshapiro VOP_UNLOCK(vp, 0); 92590792Sgshapiro mp->mnt_optnew = fsdata; 92690792Sgshapiro vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 92790792Sgshapiro } else { 92890792Sgshapiro /* 92964562Sgshapiro * If the user is not root, ensure that they own the directory 93038032Speter * onto which we are attempting to mount. 93138032Speter */ 93290792Sgshapiro error = VOP_GETATTR(vp, &va, td->td_ucred); 93338032Speter if (error) { 93464562Sgshapiro vput(vp); 93538032Speter return (error); 93638032Speter } 93738032Speter if (va.va_uid != td->td_ucred->cr_uid) { 93838032Speter error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 93938032Speter 0); 94038032Speter if (error) { 94138032Speter vput(vp); 94238032Speter return (error); 94338032Speter } 94438032Speter } 94590792Sgshapiro error = vinvalbuf(vp, V_SAVE, 0, 0); 94638032Speter if (error != 0) { 94738032Speter vput(vp); 94838032Speter return (error); 94938032Speter } 95038032Speter if (vp->v_type != VDIR) { 95138032Speter vput(vp); 95238032Speter return (ENOTDIR); 95338032Speter } 95438032Speter VI_LOCK(vp); 95564562Sgshapiro if ((vp->v_iflag & VI_MOUNT) != 0 || 95638032Speter vp->v_mountedhere != NULL) { 95738032Speter VI_UNLOCK(vp); 95838032Speter vput(vp); 95938032Speter return (EBUSY); 96038032Speter } 96164562Sgshapiro vp->v_iflag |= VI_MOUNT; 96238032Speter VI_UNLOCK(vp); 96338032Speter 96438032Speter /* 96538032Speter * Allocate and initialize the filesystem. 96638032Speter */ 96738032Speter mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 96838032Speter VOP_UNLOCK(vp, 0); 96938032Speter 97038032Speter /* XXXMAC: pass to vfs_mount_alloc? */ 97138032Speter mp->mnt_optnew = fsdata; 97238032Speter } 97338032Speter 97464562Sgshapiro /* 97590792Sgshapiro * Set the mount level flags. 97638032Speter */ 97790792Sgshapiro MNT_ILOCK(mp); 97890792Sgshapiro mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) | 97990792Sgshapiro (fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS | 98090792Sgshapiro MNT_RDONLY)); 98190792Sgshapiro if ((mp->mnt_flag & MNT_ASYNC) == 0) 98238032Speter mp->mnt_kern_flag &= ~MNTK_ASYNC; 98390792Sgshapiro MNT_IUNLOCK(mp); 98490792Sgshapiro /* 98590792Sgshapiro * Mount the filesystem. 98690792Sgshapiro * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 98790792Sgshapiro * get. No freeing of cn_pnbuf. 98890792Sgshapiro */ 98990792Sgshapiro error = VFS_MOUNT(mp, td); 99090792Sgshapiro 99190792Sgshapiro /* 99290792Sgshapiro * Process the export option only if we are 99390792Sgshapiro * updating mount options. 99490792Sgshapiro */ 99590792Sgshapiro if (!error && (fsflags & MNT_UPDATE)) { 99690792Sgshapiro if (vfs_copyopt(mp->mnt_optnew, "export", &export, 99790792Sgshapiro sizeof(export)) == 0) 99890792Sgshapiro error = vfs_export(mp, &export); 99990792Sgshapiro else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 100090792Sgshapiro sizeof(oexport)) == 0) { 100190792Sgshapiro export.ex_flags = oexport.ex_flags; 100290792Sgshapiro export.ex_root = oexport.ex_root; 100390792Sgshapiro export.ex_anon = oexport.ex_anon; 100490792Sgshapiro export.ex_addr = oexport.ex_addr; 100590792Sgshapiro export.ex_addrlen = oexport.ex_addrlen; 100690792Sgshapiro export.ex_mask = oexport.ex_mask; 100790792Sgshapiro export.ex_masklen = oexport.ex_masklen; 100890792Sgshapiro export.ex_indexfile = oexport.ex_indexfile; 100990792Sgshapiro export.ex_numsecflavors = 0; 101090792Sgshapiro error = vfs_export(mp, &export); 101190792Sgshapiro } 101290792Sgshapiro } 101390792Sgshapiro 101490792Sgshapiro if (!error) { 101590792Sgshapiro if (mp->mnt_opt != NULL) 101690792Sgshapiro vfs_freeopts(mp->mnt_opt); 101790792Sgshapiro mp->mnt_opt = mp->mnt_optnew; 101890792Sgshapiro (void)VFS_STATFS(mp, &mp->mnt_stat, td); 101990792Sgshapiro } 102090792Sgshapiro /* 102190792Sgshapiro * Prevent external consumers of mount options from reading 102290792Sgshapiro * mnt_optnew. 102390792Sgshapiro */ 102490792Sgshapiro mp->mnt_optnew = NULL; 102590792Sgshapiro if (mp->mnt_flag & MNT_UPDATE) { 102690792Sgshapiro MNT_ILOCK(mp); 102790792Sgshapiro if (error) 102890792Sgshapiro mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | 102990792Sgshapiro (flag & ~MNT_QUOTA); 103090792Sgshapiro else 103190792Sgshapiro mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | 103290792Sgshapiro MNT_FORCE | MNT_SNAPSHOT); 103390792Sgshapiro if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 103490792Sgshapiro mp->mnt_kern_flag |= MNTK_ASYNC; 103590792Sgshapiro else 103690792Sgshapiro mp->mnt_kern_flag &= ~MNTK_ASYNC; 103790792Sgshapiro MNT_IUNLOCK(mp); 103890792Sgshapiro if ((mp->mnt_flag & MNT_RDONLY) == 0) { 103990792Sgshapiro if (mp->mnt_syncer == NULL) 104090792Sgshapiro error = vfs_allocate_syncvnode(mp); 104190792Sgshapiro } else { 104290792Sgshapiro if (mp->mnt_syncer != NULL) 104390792Sgshapiro vrele(mp->mnt_syncer); 104490792Sgshapiro mp->mnt_syncer = NULL; 104590792Sgshapiro } 104690792Sgshapiro vfs_unbusy(mp); 104790792Sgshapiro VI_LOCK(vp); 104890792Sgshapiro vp->v_iflag &= ~VI_MOUNT; 104990792Sgshapiro VI_UNLOCK(vp); 105090792Sgshapiro vrele(vp); 105190792Sgshapiro return (error); 105290792Sgshapiro } 105390792Sgshapiro MNT_ILOCK(mp); 105490792Sgshapiro if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 105590792Sgshapiro mp->mnt_kern_flag |= MNTK_ASYNC; 105690792Sgshapiro else 105790792Sgshapiro mp->mnt_kern_flag &= ~MNTK_ASYNC; 105890792Sgshapiro MNT_IUNLOCK(mp); 105990792Sgshapiro vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 106090792Sgshapiro /* 106190792Sgshapiro * Put the new filesystem on the mount list after root. 106290792Sgshapiro */ 106390792Sgshapiro cache_purge(vp); 106490792Sgshapiro if (!error) { 106590792Sgshapiro struct vnode *newdp; 106690792Sgshapiro 106790792Sgshapiro VI_LOCK(vp); 106890792Sgshapiro vp->v_iflag &= ~VI_MOUNT; 106990792Sgshapiro VI_UNLOCK(vp); 107090792Sgshapiro vp->v_mountedhere = mp; 107190792Sgshapiro mtx_lock(&mountlist_mtx); 107290792Sgshapiro TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 107390792Sgshapiro mtx_unlock(&mountlist_mtx); 107490792Sgshapiro vfs_event_signal(NULL, VQ_MOUNT, 0); 107590792Sgshapiro if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td)) 107690792Sgshapiro panic("mount: lost mount"); 107790792Sgshapiro mountcheckdirs(vp, newdp); 107890792Sgshapiro vput(newdp); 107990792Sgshapiro VOP_UNLOCK(vp, 0); 108090792Sgshapiro if ((mp->mnt_flag & MNT_RDONLY) == 0) 108190792Sgshapiro error = vfs_allocate_syncvnode(mp); 108290792Sgshapiro vfs_unbusy(mp); 108390792Sgshapiro if (error) 108490792Sgshapiro vrele(vp); 108590792Sgshapiro } else { 108690792Sgshapiro VI_LOCK(vp); 108790792Sgshapiro vp->v_iflag &= ~VI_MOUNT; 108890792Sgshapiro VI_UNLOCK(vp); 108990792Sgshapiro vfs_unbusy(mp); 109090792Sgshapiro vfs_mount_destroy(mp); 109190792Sgshapiro vput(vp); 109290792Sgshapiro } 109390792Sgshapiro return (error); 109490792Sgshapiro} 109590792Sgshapiro 109690792Sgshapiro/* 109790792Sgshapiro * Unmount a filesystem. 109890792Sgshapiro * 109990792Sgshapiro * Note: unmount takes a path to the vnode mounted on as argument, not 110090792Sgshapiro * special file (as before). 110190792Sgshapiro */ 110290792Sgshapiro#ifndef _SYS_SYSPROTO_H_ 110390792Sgshapirostruct unmount_args { 110490792Sgshapiro char *path; 110590792Sgshapiro int flags; 110690792Sgshapiro}; 110790792Sgshapiro#endif 110890792Sgshapiro/* ARGSUSED */ 110990792Sgshapiroint 111090792Sgshapirounmount(td, uap) 111190792Sgshapiro struct thread *td; 111290792Sgshapiro register struct unmount_args /* { 111390792Sgshapiro char *path; 111490792Sgshapiro int flags; 111590792Sgshapiro } */ *uap; 111690792Sgshapiro{ 111790792Sgshapiro struct mount *mp; 111890792Sgshapiro char *pathbuf; 111990792Sgshapiro int error, id0, id1; 112090792Sgshapiro 112190792Sgshapiro if (jailed(td->td_ucred) || usermount == 0) { 112290792Sgshapiro error = priv_check(td, PRIV_VFS_UNMOUNT); 112390792Sgshapiro if (error) 112490792Sgshapiro return (error); 112590792Sgshapiro } 112690792Sgshapiro 112790792Sgshapiro pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 112890792Sgshapiro error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 112990792Sgshapiro if (error) { 113090792Sgshapiro free(pathbuf, M_TEMP); 113190792Sgshapiro return (error); 113290792Sgshapiro } 113390792Sgshapiro AUDIT_ARG(upath, td, pathbuf, ARG_UPATH1); 113490792Sgshapiro mtx_lock(&Giant); 113590792Sgshapiro if (uap->flags & MNT_BYFSID) { 113690792Sgshapiro /* Decode the filesystem ID. */ 113790792Sgshapiro if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 113890792Sgshapiro mtx_unlock(&Giant); 113990792Sgshapiro free(pathbuf, M_TEMP); 114090792Sgshapiro return (EINVAL); 114190792Sgshapiro } 114290792Sgshapiro 114390792Sgshapiro mtx_lock(&mountlist_mtx); 114490792Sgshapiro TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 114590792Sgshapiro if (mp->mnt_stat.f_fsid.val[0] == id0 && 114690792Sgshapiro mp->mnt_stat.f_fsid.val[1] == id1) 114790792Sgshapiro break; 114890792Sgshapiro } 114990792Sgshapiro mtx_unlock(&mountlist_mtx); 115090792Sgshapiro } else { 115190792Sgshapiro mtx_lock(&mountlist_mtx); 115290792Sgshapiro TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 115390792Sgshapiro if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 115490792Sgshapiro break; 115590792Sgshapiro } 115690792Sgshapiro mtx_unlock(&mountlist_mtx); 115790792Sgshapiro } 115890792Sgshapiro free(pathbuf, M_TEMP); 115990792Sgshapiro if (mp == NULL) { 116090792Sgshapiro /* 116190792Sgshapiro * Previously we returned ENOENT for a nonexistent path and 116290792Sgshapiro * EINVAL for a non-mountpoint. We cannot tell these apart 116390792Sgshapiro * now, so in the !MNT_BYFSID case return the more likely 116490792Sgshapiro * EINVAL for compatibility. 116590792Sgshapiro */ 116690792Sgshapiro mtx_unlock(&Giant); 116790792Sgshapiro return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 116890792Sgshapiro } 116990792Sgshapiro 117090792Sgshapiro /* 117190792Sgshapiro * Don't allow unmounting the root filesystem. 117290792Sgshapiro */ 117390792Sgshapiro if (mp->mnt_flag & MNT_ROOTFS) { 117490792Sgshapiro mtx_unlock(&Giant); 117590792Sgshapiro return (EINVAL); 117690792Sgshapiro } 117790792Sgshapiro error = dounmount(mp, uap->flags, td); 117890792Sgshapiro mtx_unlock(&Giant); 117990792Sgshapiro return (error); 118090792Sgshapiro} 118190792Sgshapiro 118290792Sgshapiro/* 118390792Sgshapiro * Do the actual filesystem unmount. 118490792Sgshapiro */ 118590792Sgshapiroint 118690792Sgshapirodounmount(mp, flags, td) 118790792Sgshapiro struct mount *mp; 118890792Sgshapiro int flags; 118990792Sgshapiro struct thread *td; 119090792Sgshapiro{ 119190792Sgshapiro struct vnode *coveredvp, *fsrootvp; 119290792Sgshapiro int error; 119390792Sgshapiro int async_flag; 119490792Sgshapiro int mnt_gen_r; 119590792Sgshapiro 119690792Sgshapiro mtx_assert(&Giant, MA_OWNED); 119790792Sgshapiro 119890792Sgshapiro if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 119990792Sgshapiro mnt_gen_r = mp->mnt_gen; 120090792Sgshapiro VI_LOCK(coveredvp); 120190792Sgshapiro vholdl(coveredvp); 120290792Sgshapiro vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 120390792Sgshapiro vdrop(coveredvp); 120490792Sgshapiro /* 1205110560Sgshapiro * Check for mp being unmounted while waiting for the 120690792Sgshapiro * covered vnode lock. 120790792Sgshapiro */ 120890792Sgshapiro if (coveredvp->v_mountedhere != mp || 120990792Sgshapiro coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 121090792Sgshapiro VOP_UNLOCK(coveredvp, 0); 121190792Sgshapiro return (EBUSY); 121290792Sgshapiro } 121390792Sgshapiro } 121490792Sgshapiro /* 121590792Sgshapiro * Only privileged root, or (if MNT_USER is set) the user that did the 121690792Sgshapiro * original mount is permitted to unmount this filesystem. 121790792Sgshapiro */ 121890792Sgshapiro error = vfs_suser(mp, td); 121990792Sgshapiro if (error) { 122094334Sgshapiro if (coveredvp) 122190792Sgshapiro VOP_UNLOCK(coveredvp, 0); 122290792Sgshapiro return (error); 122390792Sgshapiro } 122490792Sgshapiro 122590792Sgshapiro MNT_ILOCK(mp); 122690792Sgshapiro if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 122790792Sgshapiro MNT_IUNLOCK(mp); 122890792Sgshapiro if (coveredvp) 122990792Sgshapiro VOP_UNLOCK(coveredvp, 0); 123090792Sgshapiro return (EBUSY); 123194334Sgshapiro } 123290792Sgshapiro mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 123390792Sgshapiro /* Allow filesystems to detect that a forced unmount is in progress. */ 123494334Sgshapiro if (flags & MNT_FORCE) 123590792Sgshapiro mp->mnt_kern_flag |= MNTK_UNMOUNTF; 123690792Sgshapiro error = 0; 123794334Sgshapiro if (mp->mnt_lockref) { 123894334Sgshapiro if ((flags & MNT_FORCE) == 0) { 123994334Sgshapiro mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ | 124094334Sgshapiro MNTK_UNMOUNTF); 124194334Sgshapiro if (mp->mnt_kern_flag & MNTK_MWAIT) { 124294334Sgshapiro mp->mnt_kern_flag &= ~MNTK_MWAIT; 124390792Sgshapiro wakeup(mp); 124490792Sgshapiro } 124590792Sgshapiro MNT_IUNLOCK(mp); 124690792Sgshapiro if (coveredvp) 124790792Sgshapiro VOP_UNLOCK(coveredvp, 0); 124890792Sgshapiro return (EBUSY); 124994334Sgshapiro } 125094334Sgshapiro mp->mnt_kern_flag |= MNTK_DRAINING; 125190792Sgshapiro error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 125290792Sgshapiro "mount drain", 0); 125390792Sgshapiro } 125490792Sgshapiro MNT_IUNLOCK(mp); 125590792Sgshapiro KASSERT(mp->mnt_lockref == 0, 125694334Sgshapiro ("%s: invalid lock refcount in the drain path @ %s:%d", 125794334Sgshapiro __func__, __FILE__, __LINE__)); 125894334Sgshapiro KASSERT(error == 0, 125994334Sgshapiro ("%s: invalid return value for msleep in the drain path @ %s:%d", 126090792Sgshapiro __func__, __FILE__, __LINE__)); 126190792Sgshapiro vn_start_write(NULL, &mp, V_WAIT); 126290792Sgshapiro 126390792Sgshapiro if (mp->mnt_flag & MNT_EXPUBLIC) 126490792Sgshapiro vfs_setpublicfs(NULL, NULL, NULL); 126590792Sgshapiro 126690792Sgshapiro vfs_msync(mp, MNT_WAIT); 126790792Sgshapiro MNT_ILOCK(mp); 126894334Sgshapiro async_flag = mp->mnt_flag & MNT_ASYNC; 126994334Sgshapiro mp->mnt_flag &= ~MNT_ASYNC; 127094334Sgshapiro mp->mnt_kern_flag &= ~MNTK_ASYNC; 127194334Sgshapiro MNT_IUNLOCK(mp); 127294334Sgshapiro cache_purgevfs(mp); /* remove cache entries for this file sys */ 127394334Sgshapiro if (mp->mnt_syncer != NULL) 127494334Sgshapiro vrele(mp->mnt_syncer); 127594334Sgshapiro /* 127694334Sgshapiro * For forced unmounts, move process cdir/rdir refs on the fs root 127794334Sgshapiro * vnode to the covered vnode. For non-forced unmounts we want 127894334Sgshapiro * such references to cause an EBUSY error. 127994334Sgshapiro */ 128094334Sgshapiro if ((flags & MNT_FORCE) && 128194334Sgshapiro VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 128294334Sgshapiro if (mp->mnt_vnodecovered != NULL) 128394334Sgshapiro mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 128494334Sgshapiro if (fsrootvp == rootvnode) { 128594334Sgshapiro vrele(rootvnode); 128694334Sgshapiro rootvnode = NULL; 128794334Sgshapiro } 128894334Sgshapiro vput(fsrootvp); 128990792Sgshapiro } 129090792Sgshapiro if (((mp->mnt_flag & MNT_RDONLY) || 129194334Sgshapiro (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || 129290792Sgshapiro (flags & MNT_FORCE)) { 129394334Sgshapiro error = VFS_UNMOUNT(mp, flags, td); 129494334Sgshapiro } 129590792Sgshapiro vn_finished_write(mp); 129690792Sgshapiro /* 129790792Sgshapiro * If we failed to flush the dirty blocks for this mount point, 129894334Sgshapiro * undo all the cdir/rdir and rootvnode changes we made above. 129994334Sgshapiro * Unless we failed to do so because the device is reporting that 130090792Sgshapiro * it doesn't exist anymore. 130194334Sgshapiro */ 130294334Sgshapiro if (error && error != ENXIO) { 130390792Sgshapiro if ((flags & MNT_FORCE) && 130494334Sgshapiro VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 130594334Sgshapiro if (mp->mnt_vnodecovered != NULL) 130694334Sgshapiro mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 130794334Sgshapiro if (rootvnode == NULL) { 130894334Sgshapiro rootvnode = fsrootvp; 130994334Sgshapiro vref(rootvnode); 131094334Sgshapiro } 131194334Sgshapiro vput(fsrootvp); 131294334Sgshapiro } 131394334Sgshapiro MNT_ILOCK(mp); 131494334Sgshapiro mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 131594334Sgshapiro if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) { 131694334Sgshapiro MNT_IUNLOCK(mp); 131794334Sgshapiro (void) vfs_allocate_syncvnode(mp); 131894334Sgshapiro MNT_ILOCK(mp); 131994334Sgshapiro } 132094334Sgshapiro mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 132194334Sgshapiro mp->mnt_flag |= async_flag; 132294334Sgshapiro if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 132394334Sgshapiro mp->mnt_kern_flag |= MNTK_ASYNC; 132494334Sgshapiro if (mp->mnt_kern_flag & MNTK_MWAIT) { 132594334Sgshapiro mp->mnt_kern_flag &= ~MNTK_MWAIT; 132694334Sgshapiro wakeup(mp); 132794334Sgshapiro } 132894334Sgshapiro MNT_IUNLOCK(mp); 132994334Sgshapiro if (coveredvp) 133094334Sgshapiro VOP_UNLOCK(coveredvp, 0); 133194334Sgshapiro return (error); 133294334Sgshapiro } 133394334Sgshapiro mtx_lock(&mountlist_mtx); 133494334Sgshapiro TAILQ_REMOVE(&mountlist, mp, mnt_list); 133594334Sgshapiro mtx_unlock(&mountlist_mtx); 133694334Sgshapiro if (coveredvp != NULL) { 133794334Sgshapiro coveredvp->v_mountedhere = NULL; 133894334Sgshapiro vput(coveredvp); 133994334Sgshapiro } 134094334Sgshapiro vfs_event_signal(NULL, VQ_UNMOUNT, 0); 134194334Sgshapiro vfs_mount_destroy(mp); 134294334Sgshapiro return (0); 134394334Sgshapiro} 134494334Sgshapiro 134594334Sgshapiro/* 134694334Sgshapiro * --------------------------------------------------------------------- 134794334Sgshapiro * Mounting of root filesystem 134894334Sgshapiro * 134994334Sgshapiro */ 135094334Sgshapiro 135194334Sgshapirostruct root_hold_token { 135294334Sgshapiro const char *who; 135394334Sgshapiro LIST_ENTRY(root_hold_token) list; 135494334Sgshapiro}; 135594334Sgshapiro 135694334Sgshapirostatic LIST_HEAD(, root_hold_token) root_holds = 135794334Sgshapiro LIST_HEAD_INITIALIZER(&root_holds); 135894334Sgshapiro 135938032Speterstatic int root_mount_complete; 136038032Speter 136138032Speter/* 136238032Speter * Hold root mount. 136338032Speter */ 136438032Speterstruct root_hold_token * 136590792Sgshapiroroot_mount_hold(const char *identifier) 136638032Speter{ 136738032Speter struct root_hold_token *h; 136890792Sgshapiro 136990792Sgshapiro h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 137090792Sgshapiro h->who = identifier; 137190792Sgshapiro mtx_lock(&mountlist_mtx); 137238032Speter LIST_INSERT_HEAD(&root_holds, h, list); 137338032Speter mtx_unlock(&mountlist_mtx); 137490792Sgshapiro return (h); 137538032Speter} 137638032Speter 137790792Sgshapiro/* 137890792Sgshapiro * Release root mount. 137938032Speter */ 138038032Spetervoid 138164562Sgshapiroroot_mount_rel(struct root_hold_token *h) 138264562Sgshapiro{ 138364562Sgshapiro 138438032Speter mtx_lock(&mountlist_mtx); 138564562Sgshapiro LIST_REMOVE(h, list); 138664562Sgshapiro wakeup(&root_holds); 138764562Sgshapiro mtx_unlock(&mountlist_mtx); 138864562Sgshapiro free(h, M_DEVBUF); 138964562Sgshapiro} 139064562Sgshapiro 139138032Speter/* 139290792Sgshapiro * Wait for all subsystems to release root mount. 139338032Speter */ 139438032Speterstatic void 139590792Sgshapiroroot_mount_prepare(void) 139690792Sgshapiro{ 139738032Speter struct root_hold_token *h; 139864562Sgshapiro 139990792Sgshapiro for (;;) { 140064562Sgshapiro DROP_GIANT(); 140190792Sgshapiro g_waitidle(); 140290792Sgshapiro PICKUP_GIANT(); 140390792Sgshapiro mtx_lock(&mountlist_mtx); 140464562Sgshapiro if (LIST_EMPTY(&root_holds)) { 140590792Sgshapiro mtx_unlock(&mountlist_mtx); 140690792Sgshapiro break; 140790792Sgshapiro } 140890792Sgshapiro printf("Root mount waiting for:"); 140990792Sgshapiro LIST_FOREACH(h, &root_holds, list) 141090792Sgshapiro printf(" %s", h->who); 141190792Sgshapiro printf("\n"); 141271345Sgshapiro msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold", 141390792Sgshapiro hz); 141494334Sgshapiro } 141571345Sgshapiro} 141690792Sgshapiro 141790792Sgshapiro/* 141890792Sgshapiro * Root was mounted, share the good news. 141990792Sgshapiro */ 142090792Sgshapirostatic void 142164562Sgshapiroroot_mount_done(void) 142290792Sgshapiro{ 142390792Sgshapiro 142490792Sgshapiro /* 142590792Sgshapiro * Use a mutex to prevent the wakeup being missed and waiting for 142690792Sgshapiro * an extra 1 second sleep. 142790792Sgshapiro */ 142890792Sgshapiro mtx_lock(&mountlist_mtx); 142990792Sgshapiro root_mount_complete = 1; 143090792Sgshapiro wakeup(&root_mount_complete); 143190792Sgshapiro mtx_unlock(&mountlist_mtx); 143290792Sgshapiro} 143390792Sgshapiro 143490792Sgshapiro/* 143590792Sgshapiro * Return true if root is already mounted. 143690792Sgshapiro */ 143790792Sgshapiroint 143890792Sgshapiroroot_mounted(void) 143990792Sgshapiro{ 144090792Sgshapiro 144190792Sgshapiro /* No mutex is acquired here because int stores are atomic. */ 144264562Sgshapiro return (root_mount_complete); 1443110560Sgshapiro} 1444110560Sgshapiro 144564562Sgshapiro/* 144690792Sgshapiro * Wait until root is mounted. 144790792Sgshapiro */ 144890792Sgshapirovoid 144990792Sgshapiroroot_mount_wait(void) 145090792Sgshapiro{ 145190792Sgshapiro 145290792Sgshapiro /* 145364562Sgshapiro * Panic on an obvious deadlock - the function can't be called from 145464562Sgshapiro * a thread which is doing the whole SYSINIT stuff. 145590792Sgshapiro */ 145690792Sgshapiro KASSERT(curthread->td_proc->p_pid != 0, 145790792Sgshapiro ("root_mount_wait: cannot be called from the swapper thread")); 145890792Sgshapiro mtx_lock(&mountlist_mtx); 145990792Sgshapiro while (!root_mount_complete) { 146090792Sgshapiro msleep(&root_mount_complete, &mountlist_mtx, PZERO, "rootwait", 146190792Sgshapiro hz); 146290792Sgshapiro } 146390792Sgshapiro mtx_unlock(&mountlist_mtx); 146490792Sgshapiro} 146564562Sgshapiro 146664562Sgshapirostatic void 146790792Sgshapiroset_rootvnode(struct thread *td) 146890792Sgshapiro{ 146990792Sgshapiro struct proc *p; 1470102528Sgshapiro 1471102528Sgshapiro if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td)) 1472102528Sgshapiro panic("Cannot find root vnode"); 1473102528Sgshapiro 1474102528Sgshapiro p = td->td_proc; 1475102528Sgshapiro FILEDESC_XLOCK(p->p_fd); 1476102528Sgshapiro 1477102528Sgshapiro if (p->p_fd->fd_cdir != NULL) 1478102528Sgshapiro vrele(p->p_fd->fd_cdir); 1479102528Sgshapiro p->p_fd->fd_cdir = rootvnode; 1480102528Sgshapiro VREF(rootvnode); 148190792Sgshapiro 148290792Sgshapiro if (p->p_fd->fd_rdir != NULL) 1483102528Sgshapiro vrele(p->p_fd->fd_rdir); 1484110560Sgshapiro p->p_fd->fd_rdir = rootvnode; 1485110560Sgshapiro VREF(rootvnode); 1486110560Sgshapiro 1487110560Sgshapiro FILEDESC_XUNLOCK(p->p_fd); 1488110560Sgshapiro 1489110560Sgshapiro VOP_UNLOCK(rootvnode, 0); 1490110560Sgshapiro 1491110560Sgshapiro EVENTHANDLER_INVOKE(mountroot); 1492110560Sgshapiro} 149390792Sgshapiro 149490792Sgshapiro/* 149564562Sgshapiro * Mount /devfs as our root filesystem, but do not put it on the mountlist 149664562Sgshapiro * yet. Create a /dev -> / symlink so that absolute pathnames will lookup. 1497102528Sgshapiro */ 1498102528Sgshapiro 149964562Sgshapirostatic void 150064562Sgshapirodevfs_first(void) 150164562Sgshapiro{ 1502102528Sgshapiro struct thread *td = curthread; 1503102528Sgshapiro struct vfsoptlist *opts; 150464562Sgshapiro struct vfsconf *vfsp; 1505102528Sgshapiro struct mount *mp = NULL; 150664562Sgshapiro int error; 150790792Sgshapiro 150894334Sgshapiro vfsp = vfs_byname("devfs"); 150990792Sgshapiro KASSERT(vfsp != NULL, ("Could not find devfs by name")); 151064562Sgshapiro if (vfsp == NULL) 151190792Sgshapiro return; 151290792Sgshapiro 151390792Sgshapiro mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 151490792Sgshapiro 151590792Sgshapiro error = VFS_MOUNT(mp, td); 151690792Sgshapiro KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 151790792Sgshapiro if (error) 151890792Sgshapiro return; 151994334Sgshapiro 152090792Sgshapiro opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 152190792Sgshapiro TAILQ_INIT(opts); 152290792Sgshapiro mp->mnt_opt = opts; 152390792Sgshapiro 152490792Sgshapiro mtx_lock(&mountlist_mtx); 152590792Sgshapiro TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 152690792Sgshapiro mtx_unlock(&mountlist_mtx); 152790792Sgshapiro 152890792Sgshapiro set_rootvnode(td); 152964562Sgshapiro 153064562Sgshapiro error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 153190792Sgshapiro if (error) 153290792Sgshapiro printf("kern_symlink /dev -> / returns %d\n", error); 153364562Sgshapiro} 153490792Sgshapiro 153590792Sgshapiro/* 153690792Sgshapiro * Surgically move our devfs to be mounted on /dev. 153790792Sgshapiro */ 153890792Sgshapiro 153990792Sgshapirostatic void 154090792Sgshapirodevfs_fixup(struct thread *td) 154190792Sgshapiro{ 154290792Sgshapiro struct nameidata nd; 154390792Sgshapiro int error; 154490792Sgshapiro struct vnode *vp, *dvp; 154590792Sgshapiro struct mount *mp; 154690792Sgshapiro 154790792Sgshapiro /* Remove our devfs mount from the mountlist and purge the cache */ 154890792Sgshapiro mtx_lock(&mountlist_mtx); 154990792Sgshapiro mp = TAILQ_FIRST(&mountlist); 155090792Sgshapiro TAILQ_REMOVE(&mountlist, mp, mnt_list); 155190792Sgshapiro mtx_unlock(&mountlist_mtx); 155290792Sgshapiro cache_purgevfs(mp); 155390792Sgshapiro 155490792Sgshapiro VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td); 155590792Sgshapiro VI_LOCK(dvp); 155690792Sgshapiro dvp->v_iflag &= ~VI_MOUNT; 155790792Sgshapiro VI_UNLOCK(dvp); 155890792Sgshapiro dvp->v_mountedhere = NULL; 155990792Sgshapiro 156090792Sgshapiro /* Set up the real rootvnode, and purge the cache */ 156190792Sgshapiro TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL; 156290792Sgshapiro set_rootvnode(td); 156390792Sgshapiro cache_purgevfs(rootvnode->v_mount); 156490792Sgshapiro 156590792Sgshapiro NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 156690792Sgshapiro error = namei(&nd); 156790792Sgshapiro if (error) { 156890792Sgshapiro printf("Lookup of /dev for devfs, error: %d\n", error); 156990792Sgshapiro return; 157090792Sgshapiro } 157190792Sgshapiro NDFREE(&nd, NDF_ONLY_PNBUF); 157290792Sgshapiro vp = nd.ni_vp; 157390792Sgshapiro if (vp->v_type != VDIR) { 157490792Sgshapiro vput(vp); 157590792Sgshapiro } 157690792Sgshapiro error = vinvalbuf(vp, V_SAVE, 0, 0); 157790792Sgshapiro if (error) { 157890792Sgshapiro vput(vp); 157990792Sgshapiro } 158090792Sgshapiro cache_purge(vp); 158190792Sgshapiro mp->mnt_vnodecovered = vp; 158290792Sgshapiro vp->v_mountedhere = mp; 158390792Sgshapiro mtx_lock(&mountlist_mtx); 158490792Sgshapiro TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 158590792Sgshapiro mtx_unlock(&mountlist_mtx); 158690792Sgshapiro VOP_UNLOCK(vp, 0); 158790792Sgshapiro vput(dvp); 158890792Sgshapiro vfs_unbusy(mp); 158990792Sgshapiro 159090792Sgshapiro /* Unlink the no longer needed /dev/dev -> / symlink */ 159190792Sgshapiro kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 159290792Sgshapiro} 159390792Sgshapiro 159490792Sgshapiro/* 159590792Sgshapiro * Report errors during filesystem mounting. 159690792Sgshapiro */ 159790792Sgshapirovoid 159890792Sgshapirovfs_mount_error(struct mount *mp, const char *fmt, ...) 159990792Sgshapiro{ 160090792Sgshapiro struct vfsoptlist *moptlist = mp->mnt_optnew; 160190792Sgshapiro va_list ap; 160290792Sgshapiro int error, len; 160390792Sgshapiro char *errmsg; 160490792Sgshapiro 160590792Sgshapiro error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 160690792Sgshapiro if (error || errmsg == NULL || len <= 0) 160790792Sgshapiro return; 160890792Sgshapiro 160990792Sgshapiro va_start(ap, fmt); 161090792Sgshapiro vsnprintf(errmsg, (size_t)len, fmt, ap); 161190792Sgshapiro va_end(ap); 161290792Sgshapiro} 161390792Sgshapiro 161490792Sgshapiro/* 161590792Sgshapiro * Find and mount the root filesystem 161690792Sgshapiro */ 161790792Sgshapirovoid 161890792Sgshapirovfs_mountroot(void) 161990792Sgshapiro{ 162090792Sgshapiro char *cp; 162190792Sgshapiro int error, i, asked = 0; 162290792Sgshapiro 162390792Sgshapiro root_mount_prepare(); 162490792Sgshapiro 162590792Sgshapiro mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), 162690792Sgshapiro NULL, NULL, mount_init, mount_fini, 162790792Sgshapiro UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 162890792Sgshapiro devfs_first(); 162990792Sgshapiro 163090792Sgshapiro /* 163190792Sgshapiro * We are booted with instructions to prompt for the root filesystem. 163290792Sgshapiro */ 163390792Sgshapiro if (boothowto & RB_ASKNAME) { 163490792Sgshapiro if (!vfs_mountroot_ask()) 163590792Sgshapiro goto mounted; 163690792Sgshapiro asked = 1; 163790792Sgshapiro } 163890792Sgshapiro 163990792Sgshapiro /* 164090792Sgshapiro * The root filesystem information is compiled in, and we are 164190792Sgshapiro * booted with instructions to use it. 164290792Sgshapiro */ 164390792Sgshapiro if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) { 164490792Sgshapiro if (!vfs_mountroot_try(ctrootdevname)) 164590792Sgshapiro goto mounted; 164690792Sgshapiro ctrootdevname = NULL; 164790792Sgshapiro } 164890792Sgshapiro 164990792Sgshapiro /* 165090792Sgshapiro * We've been given the generic "use CDROM as root" flag. This is 165190792Sgshapiro * necessary because one media may be used in many different 165290792Sgshapiro * devices, so we need to search for them. 165390792Sgshapiro */ 165490792Sgshapiro if (boothowto & RB_CDROM) { 165590792Sgshapiro for (i = 0; cdrom_rootdevnames[i] != NULL; i++) { 165690792Sgshapiro if (!vfs_mountroot_try(cdrom_rootdevnames[i])) 165790792Sgshapiro goto mounted; 165890792Sgshapiro } 165990792Sgshapiro } 166090792Sgshapiro 166190792Sgshapiro /* 166290792Sgshapiro * Try to use the value read by the loader from /etc/fstab, or 166390792Sgshapiro * supplied via some other means. This is the preferred 166490792Sgshapiro * mechanism. 166590792Sgshapiro */ 166690792Sgshapiro cp = getenv("vfs.root.mountfrom"); 166790792Sgshapiro if (cp != NULL) { 166890792Sgshapiro error = vfs_mountroot_try(cp); 166990792Sgshapiro freeenv(cp); 167090792Sgshapiro if (!error) 167190792Sgshapiro goto mounted; 167290792Sgshapiro } 167390792Sgshapiro 167490792Sgshapiro /* 167590792Sgshapiro * Try values that may have been computed by code during boot 167690792Sgshapiro */ 167790792Sgshapiro if (!vfs_mountroot_try(rootdevnames[0])) 167890792Sgshapiro goto mounted; 167990792Sgshapiro if (!vfs_mountroot_try(rootdevnames[1])) 168090792Sgshapiro goto mounted; 168190792Sgshapiro 168290792Sgshapiro /* 168390792Sgshapiro * If we (still) have a compiled-in default, try it. 168490792Sgshapiro */ 168590792Sgshapiro if (ctrootdevname != NULL) 168690792Sgshapiro if (!vfs_mountroot_try(ctrootdevname)) 168790792Sgshapiro goto mounted; 168890792Sgshapiro /* 168990792Sgshapiro * Everything so far has failed, prompt on the console if we haven't 1690111823Sgshapiro * already tried that. 169190792Sgshapiro */ 169290792Sgshapiro if (!asked) 169390792Sgshapiro if (!vfs_mountroot_ask()) 169490792Sgshapiro goto mounted; 169590792Sgshapiro 169690792Sgshapiro panic("Root mount failed, startup aborted."); 169790792Sgshapiro 169890792Sgshapiromounted: 169990792Sgshapiro root_mount_done(); 170090792Sgshapiro} 170190792Sgshapiro 170290792Sgshapiro/* 170390792Sgshapiro * Mount (mountfrom) as the root filesystem. 170490792Sgshapiro */ 170590792Sgshapirostatic int 170690792Sgshapirovfs_mountroot_try(const char *mountfrom) 170790792Sgshapiro{ 170890792Sgshapiro struct mount *mp; 170990792Sgshapiro char *vfsname, *path; 171090792Sgshapiro time_t timebase; 171190792Sgshapiro int error; 171290792Sgshapiro char patt[32]; 171390792Sgshapiro 171490792Sgshapiro vfsname = NULL; 171590792Sgshapiro path = NULL; 171690792Sgshapiro mp = NULL; 171790792Sgshapiro error = EINVAL; 171890792Sgshapiro 171990792Sgshapiro if (mountfrom == NULL) 172064562Sgshapiro return (error); /* don't complain */ 172164562Sgshapiro printf("Trying to mount root from %s\n", mountfrom); 172264562Sgshapiro 172364562Sgshapiro /* parse vfs name and path */ 172490792Sgshapiro vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK); 1725110560Sgshapiro path = malloc(MNAMELEN, M_MOUNT, M_WAITOK); 172664562Sgshapiro vfsname[0] = path[0] = 0; 172764562Sgshapiro sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN); 172890792Sgshapiro if (sscanf(mountfrom, patt, vfsname, path) < 1) 172964562Sgshapiro goto out; 173064562Sgshapiro 173164562Sgshapiro if (path[0] == '\0') 173264562Sgshapiro strcpy(path, ROOTNAME); 173364562Sgshapiro 173490792Sgshapiro error = kernel_vmount( 173590792Sgshapiro MNT_RDONLY | MNT_ROOTFS, 173690792Sgshapiro "fstype", vfsname, 173790792Sgshapiro "fspath", "/", 1738110560Sgshapiro "from", path, 173990792Sgshapiro NULL); 1740110560Sgshapiro if (error == 0) { 174164562Sgshapiro /* 174238032Speter * We mount devfs prior to mounting the / FS, so the first 174390792Sgshapiro * entry will typically be devfs. 174490792Sgshapiro */ 174590792Sgshapiro mp = TAILQ_FIRST(&mountlist); 174694334Sgshapiro KASSERT(mp != NULL, ("%s: mountlist is empty", __func__)); 174790792Sgshapiro 174890792Sgshapiro /* 174990792Sgshapiro * Iterate over all currently mounted file systems and use 175038032Speter * the time stamp found to check and/or initialize the RTC. 175190792Sgshapiro * Typically devfs has no time stamp and the only other FS 175238032Speter * is the actual / FS. 175390792Sgshapiro * Call inittodr() only once and pass it the largest of the 175490792Sgshapiro * timestamps we encounter. 175590792Sgshapiro */ 175638032Speter timebase = 0; 175738032Speter do { 175838032Speter if (mp->mnt_time > timebase) 175938032Speter timebase = mp->mnt_time; 176038032Speter mp = TAILQ_NEXT(mp, mnt_list); 176190792Sgshapiro } while (mp != NULL); 176238032Speter inittodr(timebase); 176338032Speter 1764110560Sgshapiro devfs_fixup(curthread); 1765110560Sgshapiro } 176638032Speterout: 176738032Speter free(path, M_MOUNT); 176838032Speter free(vfsname, M_MOUNT); 1769110560Sgshapiro return (error); 177038032Speter} 177138032Speter 177290792Sgshapiro/* 177390792Sgshapiro * --------------------------------------------------------------------- 177438032Speter * Interactive root filesystem selection code. 177538032Speter */ 177638032Speter 177738032Speterstatic int 177838032Spetervfs_mountroot_ask(void) 177938032Speter{ 1780110560Sgshapiro char name[128]; 1781110560Sgshapiro 1782110560Sgshapiro for(;;) { 178338032Speter printf("\nManual root filesystem specification:\n"); 178438032Speter printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n"); 178564562Sgshapiro#if defined(__amd64__) || defined(__i386__) || defined(__ia64__) 178664562Sgshapiro printf(" eg. ufs:da0s1a\n"); 1787110560Sgshapiro#else 178864562Sgshapiro printf(" eg. ufs:/dev/da0a\n"); 178964562Sgshapiro#endif 179090792Sgshapiro printf(" ? List valid disk boot devices\n"); 179164562Sgshapiro printf(" <empty line> Abort manual input\n"); 179290792Sgshapiro printf("\nmountroot> "); 179338032Speter gets(name, sizeof(name), 1); 179438032Speter if (name[0] == '\0') 179538032Speter return (1); 179638032Speter if (name[0] == '?') { 179738032Speter printf("\nList of GEOM managed disk devices:\n "); 179838032Speter g_dev_print(); 1799110560Sgshapiro continue; 180038032Speter } 180138032Speter if (!vfs_mountroot_try(name)) 180238032Speter return (0); 180390792Sgshapiro } 180490792Sgshapiro} 180538032Speter 180638032Speter/* 180738032Speter * --------------------------------------------------------------------- 180838032Speter * Functions for querying mount options/arguments from filesystems. 180938032Speter */ 181090792Sgshapiro 181138032Speter/* 1812110560Sgshapiro * Check that no unknown options are given 181338032Speter */ 181438032Speterint 181590792Sgshapirovfs_filteropt(struct vfsoptlist *opts, const char **legal) 181664562Sgshapiro{ 181790792Sgshapiro struct vfsopt *opt; 181890792Sgshapiro char errmsg[255]; 181938032Speter const char **t, *p, *q; 182038032Speter int ret = 0; 182138032Speter 182238032Speter TAILQ_FOREACH(opt, opts, link) { 182390792Sgshapiro p = opt->name; 182490792Sgshapiro q = NULL; 182590792Sgshapiro if (p[0] == 'n' && p[1] == 'o') 182690792Sgshapiro q = p + 2; 182790792Sgshapiro for(t = global_opts; *t != NULL; t++) { 1828110560Sgshapiro if (strcmp(*t, p) == 0) 182990792Sgshapiro break; 183090792Sgshapiro if (q != NULL) { 183190792Sgshapiro if (strcmp(*t, q) == 0) 183238032Speter break; 183390792Sgshapiro } 183464562Sgshapiro } 183577349Sgshapiro if (*t != NULL) 183677349Sgshapiro continue; 183777349Sgshapiro for(t = legal; *t != NULL; t++) { 183890792Sgshapiro if (strcmp(*t, p) == 0) 183977349Sgshapiro break; 184077349Sgshapiro if (q != NULL) { 184190792Sgshapiro if (strcmp(*t, q) == 0) 184277349Sgshapiro break; 184390792Sgshapiro } 184490792Sgshapiro } 184590792Sgshapiro if (*t != NULL) 184690792Sgshapiro continue; 184790792Sgshapiro snprintf(errmsg, sizeof(errmsg), 184890792Sgshapiro "mount option <%s> is unknown", p); 184942575Speter printf("%s\n", errmsg); 185038032Speter ret = EINVAL; 185142575Speter } 185242575Speter if (ret != 0) { 185390792Sgshapiro TAILQ_FOREACH(opt, opts, link) { 185490792Sgshapiro if (strcmp(opt->name, "errmsg") == 0) { 185590792Sgshapiro strncpy((char *)opt->value, errmsg, opt->len); 185690792Sgshapiro } 185790792Sgshapiro } 185890792Sgshapiro } 185938032Speter return (ret); 186038032Speter} 186138032Speter 186238032Speter/* 186338032Speter * Get a mount option by its name. 186438032Speter * 186538032Speter * Return 0 if the option was found, ENOENT otherwise. 186638032Speter * If len is non-NULL it will be filled with the length 186738032Speter * of the option. If buf is non-NULL, it will be filled 186890792Sgshapiro * with the address of the option. 186938032Speter */ 187038032Speterint 187138032Spetervfs_getopt(opts, name, buf, len) 187290792Sgshapiro struct vfsoptlist *opts; 187338032Speter const char *name; 187438032Speter void **buf; 187538032Speter int *len; 187638032Speter{ 187738032Speter struct vfsopt *opt; 187838032Speter 187990792Sgshapiro KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 188090792Sgshapiro 188138032Speter TAILQ_FOREACH(opt, opts, link) { 188273188Sgshapiro if (strcmp(name, opt->name) == 0) { 188338032Speter if (len != NULL) 188438032Speter *len = opt->len; 1885110560Sgshapiro if (buf != NULL) 188638032Speter *buf = opt->value; 188738032Speter return (0); 188890792Sgshapiro } 188938032Speter } 189038032Speter return (ENOENT); 189138032Speter} 189238032Speter 189338032Speterstatic int 189438032Spetervfs_getopt_pos(struct vfsoptlist *opts, const char *name) 189538032Speter{ 189638032Speter struct vfsopt *opt; 189790792Sgshapiro int i; 189890792Sgshapiro 189990792Sgshapiro if (opts == NULL) 190038032Speter return (-1); 190138032Speter 190290792Sgshapiro i = 0; 190338032Speter TAILQ_FOREACH(opt, opts, link) { 190438032Speter if (strcmp(name, opt->name) == 0) 190538032Speter return (i); 190638032Speter ++i; 190790792Sgshapiro } 190890792Sgshapiro return (-1); 190990792Sgshapiro} 191090792Sgshapiro 191190792Sgshapirochar * 191290792Sgshapirovfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 191390792Sgshapiro{ 191490792Sgshapiro struct vfsopt *opt; 191590792Sgshapiro 191690792Sgshapiro *error = 0; 1917110560Sgshapiro TAILQ_FOREACH(opt, opts, link) { 191890792Sgshapiro if (strcmp(name, opt->name) != 0) 191990792Sgshapiro continue; 192094334Sgshapiro if (((char *)opt->value)[opt->len - 1] != '\0') { 192190792Sgshapiro *error = EINVAL; 192290792Sgshapiro return (NULL); 192390792Sgshapiro } 192490792Sgshapiro return (opt->value); 192590792Sgshapiro } 192690792Sgshapiro *error = ENOENT; 192790792Sgshapiro return (NULL); 192890792Sgshapiro} 192990792Sgshapiro 193090792Sgshapiroint 1931110560Sgshapirovfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 193294334Sgshapiro{ 193394334Sgshapiro struct vfsopt *opt; 193490792Sgshapiro 193590792Sgshapiro TAILQ_FOREACH(opt, opts, link) { 193690792Sgshapiro if (strcmp(name, opt->name) == 0) { 193790792Sgshapiro if (w != NULL) 1938110560Sgshapiro *w |= val; 193990792Sgshapiro return (1); 194090792Sgshapiro } 194190792Sgshapiro } 194290792Sgshapiro if (w != NULL) 194390792Sgshapiro *w &= ~val; 194490792Sgshapiro return (0); 194590792Sgshapiro} 194690792Sgshapiro 194790792Sgshapiroint 194890792Sgshapirovfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 194990792Sgshapiro{ 195090792Sgshapiro va_list ap; 195190792Sgshapiro struct vfsopt *opt; 195290792Sgshapiro int ret; 195390792Sgshapiro 195490792Sgshapiro KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 195590792Sgshapiro 195690792Sgshapiro TAILQ_FOREACH(opt, opts, link) { 195790792Sgshapiro if (strcmp(name, opt->name) != 0) 195890792Sgshapiro continue; 195990792Sgshapiro if (opt->len == 0 || opt->value == NULL) 196090792Sgshapiro return (0); 196190792Sgshapiro if (((char *)opt->value)[opt->len - 1] != '\0') 196290792Sgshapiro return (0); 196390792Sgshapiro va_start(ap, fmt); 196490792Sgshapiro ret = vsscanf(opt->value, fmt, ap); 196590792Sgshapiro va_end(ap); 196690792Sgshapiro return (ret); 1967110560Sgshapiro } 196890792Sgshapiro return (0); 196990792Sgshapiro} 197038032Speter 197138032Speter/* 197238032Speter * Find and copy a mount option. 197338032Speter * 197438032Speter * The size of the buffer has to be specified 197538032Speter * in len, if it is not the same length as the 197690792Sgshapiro * mount option, EINVAL is returned. 197790792Sgshapiro * Returns ENOENT if the option is not found. 197890792Sgshapiro */ 197990792Sgshapiroint 198090792Sgshapirovfs_copyopt(opts, name, dest, len) 198190792Sgshapiro struct vfsoptlist *opts; 198290792Sgshapiro const char *name; 198390792Sgshapiro void *dest; 198490792Sgshapiro int len; 198590792Sgshapiro{ 198690792Sgshapiro struct vfsopt *opt; 198790792Sgshapiro 198890792Sgshapiro KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 198990792Sgshapiro 199090792Sgshapiro TAILQ_FOREACH(opt, opts, link) { 199190792Sgshapiro if (strcmp(name, opt->name) == 0) { 199290792Sgshapiro if (len != opt->len) 199390792Sgshapiro return (EINVAL); 199490792Sgshapiro bcopy(opt->value, dest, opt->len); 199590792Sgshapiro return (0); 199638032Speter } 199790792Sgshapiro } 199890792Sgshapiro return (ENOENT); 199938032Speter} 200064562Sgshapiro 200190792Sgshapiro/* 200238032Speter * This is a helper function for filesystems to traverse their 200390792Sgshapiro * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 200490792Sgshapiro */ 200538032Speter 200638032Speterstruct vnode * 200790792Sgshapiro__mnt_vnode_next(struct vnode **mvp, struct mount *mp) 200890792Sgshapiro{ 200990792Sgshapiro struct vnode *vp; 201090792Sgshapiro 201190792Sgshapiro mtx_assert(MNT_MTX(mp), MA_OWNED); 201290792Sgshapiro 201390792Sgshapiro KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 201490792Sgshapiro if ((*mvp)->v_yield++ == 500) { 201538032Speter MNT_IUNLOCK(mp); 201638032Speter (*mvp)->v_yield = 0; 201790792Sgshapiro uio_yield(); 201890792Sgshapiro MNT_ILOCK(mp); 201990792Sgshapiro } 202090792Sgshapiro vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 202190792Sgshapiro while (vp != NULL && vp->v_type == VMARKER) 202290792Sgshapiro vp = TAILQ_NEXT(vp, v_nmntvnodes); 202338032Speter 202490792Sgshapiro /* Check if we are done */ 202590792Sgshapiro if (vp == NULL) { 202690792Sgshapiro __mnt_vnode_markerfree(mvp, mp); 202790792Sgshapiro return (NULL); 202890792Sgshapiro } 202990792Sgshapiro TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 203090792Sgshapiro TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 203190792Sgshapiro return (vp); 203290792Sgshapiro} 203390792Sgshapiro 203490792Sgshapirostruct vnode * 203590792Sgshapiro__mnt_vnode_first(struct vnode **mvp, struct mount *mp) 203690792Sgshapiro{ 203790792Sgshapiro struct vnode *vp; 203890792Sgshapiro 203990792Sgshapiro mtx_assert(MNT_MTX(mp), MA_OWNED); 204090792Sgshapiro 204190792Sgshapiro vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 204290792Sgshapiro while (vp != NULL && vp->v_type == VMARKER) 204390792Sgshapiro vp = TAILQ_NEXT(vp, v_nmntvnodes); 204490792Sgshapiro 204590792Sgshapiro /* Check if we are done */ 204690792Sgshapiro if (vp == NULL) { 204790792Sgshapiro *mvp = NULL; 204890792Sgshapiro return (NULL); 204990792Sgshapiro } 205090792Sgshapiro MNT_REF(mp); 205190792Sgshapiro MNT_IUNLOCK(mp); 205290792Sgshapiro *mvp = (struct vnode *) malloc(sizeof(struct vnode), 205390792Sgshapiro M_VNODE_MARKER, 205490792Sgshapiro M_WAITOK | M_ZERO); 205590792Sgshapiro MNT_ILOCK(mp); 205690792Sgshapiro (*mvp)->v_type = VMARKER; 205790792Sgshapiro 205890792Sgshapiro vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 205990792Sgshapiro while (vp != NULL && vp->v_type == VMARKER) 206090792Sgshapiro vp = TAILQ_NEXT(vp, v_nmntvnodes); 206190792Sgshapiro 206290792Sgshapiro /* Check if we are done */ 206390792Sgshapiro if (vp == NULL) { 206490792Sgshapiro MNT_IUNLOCK(mp); 206590792Sgshapiro free(*mvp, M_VNODE_MARKER); 206690792Sgshapiro MNT_ILOCK(mp); 206790792Sgshapiro *mvp = NULL; 206890792Sgshapiro MNT_REL(mp); 206990792Sgshapiro return (NULL); 207090792Sgshapiro } 207190792Sgshapiro (*mvp)->v_mount = mp; 207290792Sgshapiro TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 207390792Sgshapiro return (vp); 207490792Sgshapiro} 207590792Sgshapiro 207690792Sgshapiro 207790792Sgshapirovoid 207890792Sgshapiro__mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 207990792Sgshapiro{ 208090792Sgshapiro 208190792Sgshapiro if (*mvp == NULL) 208290792Sgshapiro return; 208390792Sgshapiro 208490792Sgshapiro mtx_assert(MNT_MTX(mp), MA_OWNED); 208590792Sgshapiro 208690792Sgshapiro KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 208790792Sgshapiro TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 208890792Sgshapiro MNT_IUNLOCK(mp); 208990792Sgshapiro free(*mvp, M_VNODE_MARKER); 209090792Sgshapiro MNT_ILOCK(mp); 209190792Sgshapiro *mvp = NULL; 209290792Sgshapiro MNT_REL(mp); 209390792Sgshapiro} 209490792Sgshapiro 209590792Sgshapiro 209690792Sgshapiroint 209790792Sgshapiro__vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 209890792Sgshapiro{ 209990792Sgshapiro int error; 210090792Sgshapiro 210190792Sgshapiro error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat, td); 210290792Sgshapiro if (sbp != &mp->mnt_stat) 210338032Speter *sbp = mp->mnt_stat; 210490792Sgshapiro return (error); 210590792Sgshapiro} 210690792Sgshapiro 210790792Sgshapirovoid 210890792Sgshapirovfs_mountedfrom(struct mount *mp, const char *from) 210990792Sgshapiro{ 211090792Sgshapiro 211190792Sgshapiro bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 211290792Sgshapiro strlcpy(mp->mnt_stat.f_mntfromname, from, 211390792Sgshapiro sizeof mp->mnt_stat.f_mntfromname); 211490792Sgshapiro} 211590792Sgshapiro 211690792Sgshapiro/* 211738032Speter * --------------------------------------------------------------------- 211890792Sgshapiro * This is the api for building mount args and mounting filesystems from 211990792Sgshapiro * inside the kernel. 212038032Speter * 212190792Sgshapiro * The API works by accumulation of individual args. First error is 212290792Sgshapiro * latched. 212390792Sgshapiro * 212438032Speter * XXX: should be documented in new manpage kernel_mount(9) 212590792Sgshapiro */ 2126110560Sgshapiro 212790792Sgshapiro/* A memory allocation which must be freed when we are done */ 212890792Sgshapirostruct mntaarg { 212990792Sgshapiro SLIST_ENTRY(mntaarg) next; 213090792Sgshapiro}; 213190792Sgshapiro 213290792Sgshapiro/* The header for the mount arguments */ 213390792Sgshapirostruct mntarg { 213490792Sgshapiro struct iovec *v; 213590792Sgshapiro int len; 213690792Sgshapiro int error; 213790792Sgshapiro SLIST_HEAD(, mntaarg) list; 213890792Sgshapiro}; 213990792Sgshapiro 214090792Sgshapiro/* 214190792Sgshapiro * Add a boolean argument. 214290792Sgshapiro * 214390792Sgshapiro * flag is the boolean value. 214490792Sgshapiro * name must start with "no". 214590792Sgshapiro */ 214690792Sgshapirostruct mntarg * 214790792Sgshapiromount_argb(struct mntarg *ma, int flag, const char *name) 214890792Sgshapiro{ 214990792Sgshapiro 215090792Sgshapiro KASSERT(name[0] == 'n' && name[1] == 'o', 2151110560Sgshapiro ("mount_argb(...,%s): name must start with 'no'", name)); 215290792Sgshapiro 215390792Sgshapiro return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 215490792Sgshapiro} 215590792Sgshapiro 215690792Sgshapiro/* 215790792Sgshapiro * Add an argument printf style 215890792Sgshapiro */ 215990792Sgshapirostruct mntarg * 216090792Sgshapiromount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 216190792Sgshapiro{ 216290792Sgshapiro va_list ap; 216390792Sgshapiro struct mntaarg *maa; 216490792Sgshapiro struct sbuf *sb; 216590792Sgshapiro int len; 216690792Sgshapiro 216790792Sgshapiro if (ma == NULL) { 216890792Sgshapiro ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 216990792Sgshapiro SLIST_INIT(&ma->list); 217090792Sgshapiro } 217190792Sgshapiro if (ma->error) 217290792Sgshapiro return (ma); 217390792Sgshapiro 217490792Sgshapiro ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 217590792Sgshapiro M_MOUNT, M_WAITOK); 217690792Sgshapiro ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 217790792Sgshapiro ma->v[ma->len].iov_len = strlen(name) + 1; 217890792Sgshapiro ma->len++; 217990792Sgshapiro 218090792Sgshapiro sb = sbuf_new_auto(); 218190792Sgshapiro va_start(ap, fmt); 218290792Sgshapiro sbuf_vprintf(sb, fmt, ap); 218390792Sgshapiro va_end(ap); 218490792Sgshapiro sbuf_finish(sb); 218590792Sgshapiro len = sbuf_len(sb) + 1; 218638032Speter maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 218790792Sgshapiro SLIST_INSERT_HEAD(&ma->list, maa, next); 218890792Sgshapiro bcopy(sbuf_data(sb), maa + 1, len); 218990792Sgshapiro sbuf_delete(sb); 219090792Sgshapiro 219190792Sgshapiro ma->v[ma->len].iov_base = maa + 1; 219290792Sgshapiro ma->v[ma->len].iov_len = len; 219338032Speter ma->len++; 219490792Sgshapiro 219590792Sgshapiro return (ma); 219690792Sgshapiro} 219790792Sgshapiro 219838032Speter/* 219938032Speter * Add an argument which is a userland string. 220090792Sgshapiro */ 220190792Sgshapirostruct mntarg * 220290792Sgshapiromount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 220390792Sgshapiro{ 220490792Sgshapiro struct mntaarg *maa; 220590792Sgshapiro char *tbuf; 220690792Sgshapiro 220738032Speter if (val == NULL) 220890792Sgshapiro return (ma); 220938032Speter if (ma == NULL) { 221090792Sgshapiro ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 221190792Sgshapiro SLIST_INIT(&ma->list); 221290792Sgshapiro } 221390792Sgshapiro if (ma->error) 221490792Sgshapiro return (ma); 221590792Sgshapiro maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 221690792Sgshapiro SLIST_INSERT_HEAD(&ma->list, maa, next); 221790792Sgshapiro tbuf = (void *)(maa + 1); 221864562Sgshapiro ma->error = copyinstr(val, tbuf, len, NULL); 221990792Sgshapiro return (mount_arg(ma, name, tbuf, -1)); 222090792Sgshapiro} 222190792Sgshapiro 222290792Sgshapiro/* 222390792Sgshapiro * Plain argument. 222438032Speter * 222590792Sgshapiro * If length is -1, treat value as a C string. 222690792Sgshapiro */ 222790792Sgshapirostruct mntarg * 222890792Sgshapiromount_arg(struct mntarg *ma, const char *name, const void *val, int len) 222938032Speter{ 223038032Speter 223138032Speter if (ma == NULL) { 223238032Speter ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2233110560Sgshapiro SLIST_INIT(&ma->list); 223490792Sgshapiro } 223564562Sgshapiro if (ma->error) 223690792Sgshapiro return (ma); 223738032Speter 223838032Speter ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 223938032Speter M_MOUNT, M_WAITOK); 224090792Sgshapiro ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 224190792Sgshapiro ma->v[ma->len].iov_len = strlen(name) + 1; 224290792Sgshapiro ma->len++; 224390792Sgshapiro 224490792Sgshapiro ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 224590792Sgshapiro if (len < 0) 224694334Sgshapiro ma->v[ma->len].iov_len = strlen(val) + 1; 224790792Sgshapiro else 224890792Sgshapiro ma->v[ma->len].iov_len = len; 224990792Sgshapiro ma->len++; 225094334Sgshapiro return (ma); 225177349Sgshapiro} 225277349Sgshapiro 225394334Sgshapiro/* 225477349Sgshapiro * Free a mntarg structure 225577349Sgshapiro */ 225677349Sgshapirostatic void 225777349Sgshapirofree_mntarg(struct mntarg *ma) 225890792Sgshapiro{ 225990792Sgshapiro struct mntaarg *maa; 226090792Sgshapiro 226190792Sgshapiro while (!SLIST_EMPTY(&ma->list)) { 226290792Sgshapiro maa = SLIST_FIRST(&ma->list); 226390792Sgshapiro SLIST_REMOVE_HEAD(&ma->list, next); 226490792Sgshapiro free(maa, M_MOUNT); 226590792Sgshapiro } 226690792Sgshapiro free(ma->v, M_MOUNT); 226790792Sgshapiro free(ma, M_MOUNT); 226877349Sgshapiro} 226977349Sgshapiro 227077349Sgshapiro/* 227138032Speter * Mount a filesystem 227238032Speter */ 227390792Sgshapiroint 227494334Sgshapirokernel_mount(struct mntarg *ma, int flags) 227538032Speter{ 227690792Sgshapiro struct uio auio; 227790792Sgshapiro int error; 227890792Sgshapiro 227990792Sgshapiro KASSERT(ma != NULL, ("kernel_mount NULL ma")); 228090792Sgshapiro KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 228190792Sgshapiro KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 228290792Sgshapiro 228394334Sgshapiro auio.uio_iov = ma->v; 228494334Sgshapiro auio.uio_iovcnt = ma->len; 228594334Sgshapiro auio.uio_segflg = UIO_SYSSPACE; 228694334Sgshapiro 228794334Sgshapiro error = ma->error; 228890792Sgshapiro if (!error) 228990792Sgshapiro error = vfs_donmount(curthread, flags, &auio); 229090792Sgshapiro free_mntarg(ma); 229190792Sgshapiro return (error); 229238032Speter} 229390792Sgshapiro 229490792Sgshapiro/* 229538032Speter * A printflike function to mount a filesystem. 229638032Speter */ 229790792Sgshapiroint 229890792Sgshapirokernel_vmount(int flags, ...) 229938032Speter{ 230038032Speter struct mntarg *ma = NULL; 230190792Sgshapiro va_list ap; 230290792Sgshapiro const char *cp; 230390792Sgshapiro const void *vp; 230490792Sgshapiro int error; 230590792Sgshapiro 230638032Speter va_start(ap, flags); 230738032Speter for (;;) { 230838032Speter cp = va_arg(ap, const char *); 230990792Sgshapiro if (cp == NULL) 231038032Speter break; 231138032Speter vp = va_arg(ap, const void *); 231290792Sgshapiro ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 231338032Speter } 231438032Speter va_end(ap); 231590792Sgshapiro 231690792Sgshapiro error = kernel_mount(ma, flags); 231790792Sgshapiro return (error); 231890792Sgshapiro} 231990792Sgshapiro