1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.25 */ 31 32 #include <sys/types.h> 33 #include <sys/param.h> 34 #include <sys/cmn_err.h> 35 #include <sys/cred.h> 36 #include <sys/debug.h> 37 #include <sys/errno.h> 38 #include <sys/proc.h> 39 #include <sys/procfs.h> 40 #include <sys/stat.h> 41 #include <sys/statvfs.h> 42 #include <sys/sysmacros.h> 43 #include <sys/systm.h> 44 #include <sys/zone.h> 45 #include <sys/var.h> 46 #include <sys/vfs.h> 47 #include <sys/vfs_opreg.h> 48 #include <sys/vnode.h> 49 #include <sys/mode.h> 50 #include <sys/signal.h> 51 #include <sys/user.h> 52 #include <sys/mount.h> 53 #include <sys/bitmap.h> 54 #include <sys/kmem.h> 55 #include <sys/policy.h> 56 #include <fs/fs_subr.h> 57 #include <fs/proc/prdata.h> 58 59 /* 60 * This is the loadable module wrapper. 61 */ 62 #include <sys/modctl.h> 63 64 static int prinit(); 65 66 static mntopts_t proc_mntopts = { 67 NULL, 68 0 69 }; 70 71 static vfsdef_t vfw = { 72 VFSDEF_VERSION, 73 "proc", 74 prinit, 75 VSW_HASPROTO|VSW_STATS|VSW_XID, 76 &proc_mntopts 77 }; 78 79 /* 80 * Module linkage information for the kernel. 81 */ 82 extern struct mod_ops mod_fsops; 83 84 static struct modlfs modlfs = { 85 &mod_fsops, "filesystem for proc", &vfw 86 }; 87 88 static struct modlinkage modlinkage = { 89 MODREV_1, (void *)&modlfs, NULL 90 }; 91 92 int 93 _init(void) 94 { 95 return (mod_install(&modlinkage)); 96 } 97 98 int 99 _info(struct modinfo *modinfop) 100 { 101 return (mod_info(&modlinkage, modinfop)); 102 } 103 104 /* 105 * N.B. 106 * No _fini routine. The module cannot be unloaded once loaded. 107 * The NO_UNLOAD_STUB in modstubs.s must change if this module 108 * is ever modified to become unloadable. 109 */ 110 111 int nproc_highbit; /* highbit(v.v_nproc) */ 112 113 static int procfstype; 114 static major_t procfs_major; 115 static minor_t procfs_minor; 116 static kmutex_t procfs_minor_lock; 117 118 static kmutex_t pr_mount_lock; 119 120 /* 121 * /proc VFS operations vector. 122 */ 123 static int prmount(), prunmount(), prroot(), prstatvfs(); 124 125 static void 126 prinitrootnode(prnode_t *pnp, vfs_t *vfsp) 127 { 128 struct vnode *vp; 129 130 bzero((caddr_t)pnp, sizeof (*pnp)); 131 pnp->pr_vnode = vp = vn_alloc(KM_SLEEP); 132 133 mutex_init(&pnp->pr_mutex, NULL, MUTEX_DEFAULT, NULL); 134 vp->v_flag = VROOT|VNOCACHE|VNOMAP|VNOSWAP|VNOMOUNT; 135 VN_SET_VFS_TYPE_DEV(vp, vfsp, VDIR, 0); 136 vn_setops(vp, prvnodeops); 137 vp->v_data = (caddr_t)pnp; 138 pnp->pr_type = PR_PROCDIR; 139 pnp->pr_mode = 0555; /* read-search by everyone */ 140 vn_exists(vp); 141 } 142 143 static int 144 prinit(int fstype, char *name) 145 { 146 static const fs_operation_def_t pr_vfsops_template[] = { 147 VFSNAME_MOUNT, { .vfs_mount = prmount }, 148 VFSNAME_UNMOUNT, { .vfs_unmount = prunmount }, 149 VFSNAME_ROOT, { .vfs_root = prroot }, 150 VFSNAME_STATVFS, { .vfs_statvfs = prstatvfs }, 151 NULL, NULL 152 }; 153 extern const fs_operation_def_t pr_vnodeops_template[]; 154 int error; 155 156 nproc_highbit = highbit(v.v_proc); 157 procfstype = fstype; 158 ASSERT(procfstype != 0); 159 /* 160 * Associate VFS ops vector with this fstype. 161 */ 162 error = vfs_setfsops(fstype, pr_vfsops_template, NULL); 163 if (error != 0) { 164 cmn_err(CE_WARN, "prinit: bad vfs ops template"); 165 return (error); 166 } 167 168 /* 169 * Set up vnode ops vector too. 170 */ 171 172 error = vn_make_ops(name, pr_vnodeops_template, &prvnodeops); 173 if (error != 0) { 174 (void) vfs_freevfsops_by_type(fstype); 175 cmn_err(CE_WARN, "prinit: bad vnode ops template"); 176 return (error); 177 } 178 179 /* 180 * Assign a unique "device" number (used by stat(2)). 181 */ 182 if ((procfs_major = getudev()) == (major_t)-1) { 183 cmn_err(CE_WARN, "prinit: can't get unique device number"); 184 procfs_major = 0; 185 } 186 mutex_init(&pr_mount_lock, NULL, MUTEX_DEFAULT, NULL); 187 mutex_init(&procfs_minor_lock, NULL, MUTEX_DEFAULT, NULL); 188 189 return (0); 190 } 191 192 /* ARGSUSED */ 193 static int 194 prmount(struct vfs *vfsp, struct vnode *mvp, 195 struct mounta *uap, struct cred *cr) 196 { 197 prnode_t *pnp; 198 zone_t *zone = curproc->p_zone; 199 200 if (secpolicy_fs_mount(cr, mvp, vfsp) != 0) 201 return (EPERM); 202 203 if (mvp->v_type != VDIR) 204 return (ENOTDIR); 205 206 if (zone == global_zone) { 207 zone_t *mntzone; 208 209 mntzone = zone_find_by_path(refstr_value(vfsp->vfs_mntpt)); 210 zone_rele(mntzone); 211 if (zone != mntzone) 212 return (EBUSY); 213 } 214 /* 215 * Having the resource be anything but "proc" doesn't make sense 216 */ 217 vfs_setresource(vfsp, "proc"); 218 219 pnp = kmem_alloc(sizeof (*pnp), KM_SLEEP); 220 mutex_enter(&pr_mount_lock); 221 222 mutex_enter(&mvp->v_lock); 223 if ((uap->flags & MS_OVERLAY) == 0 && 224 (mvp->v_count > 1 || (mvp->v_flag & VROOT))) { 225 mutex_exit(&mvp->v_lock); 226 mutex_exit(&pr_mount_lock); 227 kmem_free(pnp, sizeof (*pnp)); 228 return (EBUSY); 229 } 230 mutex_exit(&mvp->v_lock); 231 232 prinitrootnode(pnp, vfsp); 233 vfsp->vfs_fstype = procfstype; 234 vfsp->vfs_data = (caddr_t)pnp; 235 vfsp->vfs_bsize = DEV_BSIZE; 236 /* 237 * find an available minor device number for this mount 238 */ 239 mutex_enter(&procfs_minor_lock); 240 do { 241 vfsp->vfs_dev = makedevice(procfs_major, procfs_minor); 242 procfs_minor = (procfs_minor + 1) & L_MAXMIN32; 243 } while (vfs_devismounted(vfsp->vfs_dev)); 244 mutex_exit(&procfs_minor_lock); 245 vfs_make_fsid(&vfsp->vfs_fsid, vfsp->vfs_dev, procfstype); 246 247 mutex_exit(&pr_mount_lock); 248 return (0); 249 } 250 251 /* ARGSUSED */ 252 static int 253 prunmount(struct vfs *vfsp, int flag, struct cred *cr) 254 { 255 prnode_t *pnp = (prnode_t *)vfsp->vfs_data; 256 vnode_t *vp = PTOV(pnp); 257 258 mutex_enter(&pr_mount_lock); 259 if (secpolicy_fs_unmount(cr, vfsp) != 0) { 260 mutex_exit(&pr_mount_lock); 261 return (EPERM); 262 } 263 264 /* 265 * forced unmount is not supported by this file system 266 * and thus, ENOTSUP, is being returned. 267 */ 268 if (flag & MS_FORCE) { 269 mutex_exit(&pr_mount_lock); 270 return (ENOTSUP); 271 } 272 273 /* 274 * Ensure that no /proc vnodes are in use on this mount point. 275 */ 276 mutex_enter(&vp->v_lock); 277 if (vp->v_count > 1) { 278 mutex_exit(&vp->v_lock); 279 mutex_exit(&pr_mount_lock); 280 return (EBUSY); 281 } 282 283 mutex_exit(&vp->v_lock); 284 mutex_exit(&pr_mount_lock); 285 vn_invalid(vp); 286 vn_free(vp); 287 kmem_free(pnp, sizeof (*pnp)); 288 return (0); 289 } 290 291 /* ARGSUSED */ 292 static int 293 prroot(struct vfs *vfsp, struct vnode **vpp) 294 { 295 vnode_t *vp = PTOV((prnode_t *)vfsp->vfs_data); 296 297 VN_HOLD(vp); 298 *vpp = vp; 299 return (0); 300 } 301 302 static int 303 prstatvfs(struct vfs *vfsp, struct statvfs64 *sp) 304 { 305 int n; 306 dev32_t d32; 307 extern uint_t nproc; 308 309 n = v.v_proc - nproc; 310 311 bzero((caddr_t)sp, sizeof (*sp)); 312 sp->f_bsize = DEV_BSIZE; 313 sp->f_frsize = DEV_BSIZE; 314 sp->f_blocks = (fsblkcnt64_t)0; 315 sp->f_bfree = (fsblkcnt64_t)0; 316 sp->f_bavail = (fsblkcnt64_t)0; 317 sp->f_files = (fsfilcnt64_t)v.v_proc + 2; 318 sp->f_ffree = (fsfilcnt64_t)n; 319 sp->f_favail = (fsfilcnt64_t)n; 320 (void) cmpldev(&d32, vfsp->vfs_dev); 321 sp->f_fsid = d32; 322 (void) strcpy(sp->f_basetype, vfssw[procfstype].vsw_name); 323 sp->f_flag = vf_to_stf(vfsp->vfs_flag); 324 sp->f_namemax = 64; /* quite arbitrary */ 325 bzero(sp->f_fstr, sizeof (sp->f_fstr)); 326 (void) strcpy(sp->f_fstr, "/proc"); 327 (void) strcpy(&sp->f_fstr[6], "/proc"); 328 return (0); 329 } 330