1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include <sys/types.h> 30*0Sstevel@tonic-gate #include <sys/param.h> 31*0Sstevel@tonic-gate #include <sys/cmn_err.h> 32*0Sstevel@tonic-gate #include <sys/cred.h> 33*0Sstevel@tonic-gate #include <sys/debug.h> 34*0Sstevel@tonic-gate #include <sys/errno.h> 35*0Sstevel@tonic-gate #include <sys/proc.h> 36*0Sstevel@tonic-gate #include <sys/procfs.h> 37*0Sstevel@tonic-gate #include <sys/stat.h> 38*0Sstevel@tonic-gate #include <sys/statvfs.h> 39*0Sstevel@tonic-gate #include <sys/sysmacros.h> 40*0Sstevel@tonic-gate #include <sys/systm.h> 41*0Sstevel@tonic-gate #include <sys/var.h> 42*0Sstevel@tonic-gate #include <sys/vfs.h> 43*0Sstevel@tonic-gate #include <sys/vnode.h> 44*0Sstevel@tonic-gate #include <sys/mode.h> 45*0Sstevel@tonic-gate #include <sys/signal.h> 46*0Sstevel@tonic-gate #include <sys/user.h> 47*0Sstevel@tonic-gate #include <sys/mount.h> 48*0Sstevel@tonic-gate #include <sys/bitmap.h> 49*0Sstevel@tonic-gate #include <sys/kmem.h> 50*0Sstevel@tonic-gate #include <sys/policy.h> 51*0Sstevel@tonic-gate #include <fs/fs_subr.h> 52*0Sstevel@tonic-gate #include <sys/fs/mntdata.h> 53*0Sstevel@tonic-gate #include <sys/zone.h> 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate /* 56*0Sstevel@tonic-gate * This is the loadable module wrapper. 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate #include <sys/modctl.h> 59*0Sstevel@tonic-gate 60*0Sstevel@tonic-gate static int mntinit(int, char *); 61*0Sstevel@tonic-gate 62*0Sstevel@tonic-gate static mntopts_t mnt_mntopts = { 63*0Sstevel@tonic-gate 0, 64*0Sstevel@tonic-gate NULL 65*0Sstevel@tonic-gate }; 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate static vfsdef_t vfw = { 68*0Sstevel@tonic-gate VFSDEF_VERSION, 69*0Sstevel@tonic-gate "mntfs", 70*0Sstevel@tonic-gate mntinit, 71*0Sstevel@tonic-gate VSW_HASPROTO, 72*0Sstevel@tonic-gate &mnt_mntopts 73*0Sstevel@tonic-gate }; 74*0Sstevel@tonic-gate 75*0Sstevel@tonic-gate /* 76*0Sstevel@tonic-gate * Module linkage information for the kernel. 77*0Sstevel@tonic-gate */ 78*0Sstevel@tonic-gate extern struct mod_ops mod_fsops; 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate static struct modlfs modlfs = { 81*0Sstevel@tonic-gate &mod_fsops, "mount information file system", &vfw 82*0Sstevel@tonic-gate }; 83*0Sstevel@tonic-gate 84*0Sstevel@tonic-gate static struct modlinkage modlinkage = { 85*0Sstevel@tonic-gate MODREV_1, (void *)&modlfs, NULL 86*0Sstevel@tonic-gate }; 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate int 89*0Sstevel@tonic-gate _init(void) 90*0Sstevel@tonic-gate { 91*0Sstevel@tonic-gate return (mod_install(&modlinkage)); 92*0Sstevel@tonic-gate } 93*0Sstevel@tonic-gate 94*0Sstevel@tonic-gate int 95*0Sstevel@tonic-gate _info(struct modinfo *modinfop) 96*0Sstevel@tonic-gate { 97*0Sstevel@tonic-gate return (mod_info(&modlinkage, modinfop)); 98*0Sstevel@tonic-gate } 99*0Sstevel@tonic-gate 100*0Sstevel@tonic-gate /* 101*0Sstevel@tonic-gate * N.B. 102*0Sstevel@tonic-gate * No _fini routine. The module cannot be unloaded once loaded. 103*0Sstevel@tonic-gate * The NO_UNLOAD_STUB in modstubs.s must change if this module 104*0Sstevel@tonic-gate * is ever modified to become unloadable. 105*0Sstevel@tonic-gate */ 106*0Sstevel@tonic-gate 107*0Sstevel@tonic-gate static int mntfstype; 108*0Sstevel@tonic-gate static major_t mnt_major; 109*0Sstevel@tonic-gate static minor_t mnt_minor; 110*0Sstevel@tonic-gate static kmutex_t mnt_minor_lock; 111*0Sstevel@tonic-gate 112*0Sstevel@tonic-gate /* 113*0Sstevel@tonic-gate * /mnttab VFS operations vector. 114*0Sstevel@tonic-gate */ 115*0Sstevel@tonic-gate static int mntmount(), mntunmount(), mntroot(), mntstatvfs(); 116*0Sstevel@tonic-gate 117*0Sstevel@tonic-gate static void 118*0Sstevel@tonic-gate mntinitrootnode(mntnode_t *mnp) 119*0Sstevel@tonic-gate { 120*0Sstevel@tonic-gate struct vnode *vp; 121*0Sstevel@tonic-gate 122*0Sstevel@tonic-gate bzero((caddr_t)mnp, sizeof (*mnp)); 123*0Sstevel@tonic-gate 124*0Sstevel@tonic-gate mnp->mnt_vnode = vn_alloc(KM_SLEEP); 125*0Sstevel@tonic-gate 126*0Sstevel@tonic-gate vp = MTOV(mnp); 127*0Sstevel@tonic-gate 128*0Sstevel@tonic-gate vp->v_flag = VROOT|VNOCACHE|VNOMAP|VNOSWAP|VNOMOUNT; 129*0Sstevel@tonic-gate vn_setops(vp, mntvnodeops); 130*0Sstevel@tonic-gate vp->v_type = VREG; 131*0Sstevel@tonic-gate vp->v_data = (caddr_t)mnp; 132*0Sstevel@tonic-gate } 133*0Sstevel@tonic-gate 134*0Sstevel@tonic-gate static int 135*0Sstevel@tonic-gate mntinit(int fstype, char *name) 136*0Sstevel@tonic-gate { 137*0Sstevel@tonic-gate static const fs_operation_def_t mnt_vfsops_template[] = { 138*0Sstevel@tonic-gate VFSNAME_MOUNT, mntmount, 139*0Sstevel@tonic-gate VFSNAME_UNMOUNT, mntunmount, 140*0Sstevel@tonic-gate VFSNAME_ROOT, mntroot, 141*0Sstevel@tonic-gate VFSNAME_STATVFS, mntstatvfs, 142*0Sstevel@tonic-gate NULL, NULL 143*0Sstevel@tonic-gate }; 144*0Sstevel@tonic-gate extern const fs_operation_def_t mnt_vnodeops_template[]; 145*0Sstevel@tonic-gate int error; 146*0Sstevel@tonic-gate 147*0Sstevel@tonic-gate mntfstype = fstype; 148*0Sstevel@tonic-gate ASSERT(mntfstype != 0); 149*0Sstevel@tonic-gate /* 150*0Sstevel@tonic-gate * Associate VFS ops vector with this fstype. 151*0Sstevel@tonic-gate */ 152*0Sstevel@tonic-gate error = vfs_setfsops(fstype, mnt_vfsops_template, NULL); 153*0Sstevel@tonic-gate if (error != 0) { 154*0Sstevel@tonic-gate cmn_err(CE_WARN, "mntinit: bad vfs ops template"); 155*0Sstevel@tonic-gate return (error); 156*0Sstevel@tonic-gate } 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate /* Vnode ops too. */ 159*0Sstevel@tonic-gate 160*0Sstevel@tonic-gate error = vn_make_ops(name, mnt_vnodeops_template, &mntvnodeops); 161*0Sstevel@tonic-gate if (error != 0) { 162*0Sstevel@tonic-gate (void) vfs_freevfsops_by_type(fstype); 163*0Sstevel@tonic-gate cmn_err(CE_WARN, "mntinit: bad vnode ops template"); 164*0Sstevel@tonic-gate return (error); 165*0Sstevel@tonic-gate } 166*0Sstevel@tonic-gate 167*0Sstevel@tonic-gate /* 168*0Sstevel@tonic-gate * Assign a unique "device" number (used by stat(2)). 169*0Sstevel@tonic-gate */ 170*0Sstevel@tonic-gate if ((mnt_major = getudev()) == (major_t)-1) { 171*0Sstevel@tonic-gate cmn_err(CE_WARN, "mntinit: can't get unique device number"); 172*0Sstevel@tonic-gate mnt_major = 0; 173*0Sstevel@tonic-gate } 174*0Sstevel@tonic-gate mutex_init(&mnt_minor_lock, NULL, MUTEX_DEFAULT, NULL); 175*0Sstevel@tonic-gate 176*0Sstevel@tonic-gate return (0); 177*0Sstevel@tonic-gate } 178*0Sstevel@tonic-gate 179*0Sstevel@tonic-gate /* ARGSUSED */ 180*0Sstevel@tonic-gate static int 181*0Sstevel@tonic-gate mntmount(struct vfs *vfsp, struct vnode *mvp, 182*0Sstevel@tonic-gate struct mounta *uap, struct cred *cr) 183*0Sstevel@tonic-gate { 184*0Sstevel@tonic-gate mntdata_t *mnt; 185*0Sstevel@tonic-gate mntnode_t *mnp; 186*0Sstevel@tonic-gate zone_t *zone = curproc->p_zone; 187*0Sstevel@tonic-gate 188*0Sstevel@tonic-gate if (secpolicy_fs_mount(cr, mvp, vfsp) != 0) 189*0Sstevel@tonic-gate return (EPERM); 190*0Sstevel@tonic-gate 191*0Sstevel@tonic-gate /* 192*0Sstevel@tonic-gate * You can only mount mnttab in your current zone. 193*0Sstevel@tonic-gate */ 194*0Sstevel@tonic-gate if (zone == global_zone) { 195*0Sstevel@tonic-gate zone_t *mntzone; 196*0Sstevel@tonic-gate 197*0Sstevel@tonic-gate mntzone = zone_find_by_path(refstr_value(vfsp->vfs_mntpt)); 198*0Sstevel@tonic-gate ASSERT(mntzone != NULL); 199*0Sstevel@tonic-gate zone_rele(mntzone); 200*0Sstevel@tonic-gate if (mntzone != zone) 201*0Sstevel@tonic-gate return (EBUSY); 202*0Sstevel@tonic-gate } 203*0Sstevel@tonic-gate 204*0Sstevel@tonic-gate /* 205*0Sstevel@tonic-gate * Having the resource be anything but "mnttab" doesn't make sense 206*0Sstevel@tonic-gate */ 207*0Sstevel@tonic-gate vfs_setresource(vfsp, "mnttab"); 208*0Sstevel@tonic-gate 209*0Sstevel@tonic-gate mnt = kmem_alloc(sizeof (*mnt), KM_SLEEP); 210*0Sstevel@tonic-gate mutex_enter(&mvp->v_lock); 211*0Sstevel@tonic-gate if ((uap->flags & MS_OVERLAY) == 0 && 212*0Sstevel@tonic-gate (mvp->v_count > 1 || (mvp->v_flag & VROOT))) { 213*0Sstevel@tonic-gate mutex_exit(&mvp->v_lock); 214*0Sstevel@tonic-gate kmem_free(mnt, sizeof (*mnt)); 215*0Sstevel@tonic-gate return (EBUSY); 216*0Sstevel@tonic-gate } 217*0Sstevel@tonic-gate mutex_exit(&mvp->v_lock); 218*0Sstevel@tonic-gate 219*0Sstevel@tonic-gate mnt->mnt_nopen = 0; 220*0Sstevel@tonic-gate mnt->mnt_size = 0; 221*0Sstevel@tonic-gate zone_hold(mnt->mnt_zone = zone); 222*0Sstevel@tonic-gate mnp = &mnt->mnt_node; 223*0Sstevel@tonic-gate 224*0Sstevel@tonic-gate vfsp->vfs_fstype = mntfstype; 225*0Sstevel@tonic-gate vfsp->vfs_data = (caddr_t)mnt; 226*0Sstevel@tonic-gate /* 227*0Sstevel@tonic-gate * find an available minor device number for this mount. 228*0Sstevel@tonic-gate */ 229*0Sstevel@tonic-gate mutex_enter(&mnt_minor_lock); 230*0Sstevel@tonic-gate do { 231*0Sstevel@tonic-gate mnt_minor = (mnt_minor + 1) & L_MAXMIN32; 232*0Sstevel@tonic-gate vfsp->vfs_dev = makedevice(mnt_major, mnt_minor); 233*0Sstevel@tonic-gate } while (vfs_devismounted(vfsp->vfs_dev)); 234*0Sstevel@tonic-gate mutex_exit(&mnt_minor_lock); 235*0Sstevel@tonic-gate vfs_make_fsid(&vfsp->vfs_fsid, vfsp->vfs_dev, mntfstype); 236*0Sstevel@tonic-gate vfsp->vfs_bsize = DEV_BSIZE; 237*0Sstevel@tonic-gate mntinitrootnode(mnp); 238*0Sstevel@tonic-gate MTOV(mnp)->v_vfsp = vfsp; 239*0Sstevel@tonic-gate mnp->mnt_mountvp = mvp; 240*0Sstevel@tonic-gate vn_exists(MTOV(mnp)); 241*0Sstevel@tonic-gate return (0); 242*0Sstevel@tonic-gate } 243*0Sstevel@tonic-gate 244*0Sstevel@tonic-gate /* ARGSUSED */ 245*0Sstevel@tonic-gate static int 246*0Sstevel@tonic-gate mntunmount(struct vfs *vfsp, int flag, struct cred *cr) 247*0Sstevel@tonic-gate { 248*0Sstevel@tonic-gate mntdata_t *mnt = (mntdata_t *)vfsp->vfs_data; 249*0Sstevel@tonic-gate vnode_t *vp = MTOV(&mnt->mnt_node); 250*0Sstevel@tonic-gate 251*0Sstevel@tonic-gate if (secpolicy_fs_unmount(cr, vfsp) != 0) 252*0Sstevel@tonic-gate return (EPERM); 253*0Sstevel@tonic-gate 254*0Sstevel@tonic-gate /* 255*0Sstevel@tonic-gate * Ensure that no /mnttab vnodes are in use on this mount point. 256*0Sstevel@tonic-gate */ 257*0Sstevel@tonic-gate mutex_enter(&vp->v_lock); 258*0Sstevel@tonic-gate if (vp->v_count > 1 || mnt->mnt_nopen > 0) { 259*0Sstevel@tonic-gate mutex_exit(&vp->v_lock); 260*0Sstevel@tonic-gate return (EBUSY); 261*0Sstevel@tonic-gate } 262*0Sstevel@tonic-gate 263*0Sstevel@tonic-gate mutex_exit(&vp->v_lock); 264*0Sstevel@tonic-gate zone_rele(mnt->mnt_zone); 265*0Sstevel@tonic-gate vn_invalid(vp); 266*0Sstevel@tonic-gate vn_free(vp); 267*0Sstevel@tonic-gate kmem_free(mnt, sizeof (*mnt)); 268*0Sstevel@tonic-gate return (0); 269*0Sstevel@tonic-gate } 270*0Sstevel@tonic-gate 271*0Sstevel@tonic-gate /* ARGSUSED */ 272*0Sstevel@tonic-gate static int 273*0Sstevel@tonic-gate mntroot(struct vfs *vfsp, struct vnode **vpp) 274*0Sstevel@tonic-gate { 275*0Sstevel@tonic-gate mntnode_t *mnp = &((mntdata_t *)vfsp->vfs_data)->mnt_node; 276*0Sstevel@tonic-gate struct vnode *vp = MTOV(mnp); 277*0Sstevel@tonic-gate 278*0Sstevel@tonic-gate VN_HOLD(vp); 279*0Sstevel@tonic-gate *vpp = vp; 280*0Sstevel@tonic-gate return (0); 281*0Sstevel@tonic-gate } 282*0Sstevel@tonic-gate 283*0Sstevel@tonic-gate static int 284*0Sstevel@tonic-gate mntstatvfs(struct vfs *vfsp, struct statvfs64 *sp) 285*0Sstevel@tonic-gate { 286*0Sstevel@tonic-gate dev32_t d32; 287*0Sstevel@tonic-gate 288*0Sstevel@tonic-gate bzero((caddr_t)sp, sizeof (*sp)); 289*0Sstevel@tonic-gate sp->f_bsize = DEV_BSIZE; 290*0Sstevel@tonic-gate sp->f_frsize = DEV_BSIZE; 291*0Sstevel@tonic-gate sp->f_blocks = (fsblkcnt64_t)0; 292*0Sstevel@tonic-gate sp->f_bfree = (fsblkcnt64_t)0; 293*0Sstevel@tonic-gate sp->f_bavail = (fsblkcnt64_t)0; 294*0Sstevel@tonic-gate sp->f_files = (fsfilcnt64_t)1; 295*0Sstevel@tonic-gate sp->f_ffree = (fsfilcnt64_t)0; 296*0Sstevel@tonic-gate sp->f_favail = (fsfilcnt64_t)0; 297*0Sstevel@tonic-gate (void) cmpldev(&d32, vfsp->vfs_dev); 298*0Sstevel@tonic-gate sp->f_fsid = d32; 299*0Sstevel@tonic-gate (void) strcpy(sp->f_basetype, vfssw[mntfstype].vsw_name); 300*0Sstevel@tonic-gate sp->f_flag = vf_to_stf(vfsp->vfs_flag); 301*0Sstevel@tonic-gate sp->f_namemax = 64; /* quite arbitrary */ 302*0Sstevel@tonic-gate bzero(sp->f_fstr, sizeof (sp->f_fstr)); 303*0Sstevel@tonic-gate (void) strcpy(sp->f_fstr, "/mnttab"); 304*0Sstevel@tonic-gate (void) strcpy(&sp->f_fstr[8], "/mnttab"); 305*0Sstevel@tonic-gate return (0); 306*0Sstevel@tonic-gate } 307