Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libzfs/os/linux/libzfs_mount_os.c
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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 https://opensource.org/licenses/CDDL-1.0. 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 /* 23 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 24 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 25 * Copyright (c) 2014, 2021 by Delphix. All rights reserved. 26 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com> 27 * Copyright 2017 RackTop Systems. 28 * Copyright (c) 2018 Datto Inc. 29 * Copyright 2018 OmniOS Community Edition (OmniOSce) Association. 30 */ 31 32 #include <dirent.h> 33 #include <dlfcn.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <libgen.h> 37 #include <libintl.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 #include <zone.h> 43 #include <sys/mntent.h> 44 #include <sys/mount.h> 45 #include <sys/stat.h> 46 #include <sys/vfs.h> 47 #include <sys/dsl_crypt.h> 48 #include <libzfs.h> 49 50 #include "../../libzfs_impl.h" 51 #include <thread_pool.h> 52 53 #define ZS_COMMENT 0x00000000 /* comment */ 54 #define ZS_ZFSUTIL 0x00000001 /* caller is zfs(8) */ 55 56 typedef struct option_map { 57 const char *name; 58 unsigned long mntmask; 59 unsigned long zfsmask; 60 } option_map_t; 61 62 static const option_map_t option_map[] = { 63 /* Canonicalized filesystem independent options from mount(8) */ 64 { MNTOPT_NOAUTO, MS_COMMENT, ZS_COMMENT }, 65 { MNTOPT_DEFAULTS, MS_COMMENT, ZS_COMMENT }, 66 { MNTOPT_NODEVICES, MS_NODEV, ZS_COMMENT }, 67 { MNTOPT_DEVICES, MS_COMMENT, ZS_COMMENT }, 68 { MNTOPT_DIRSYNC, MS_DIRSYNC, ZS_COMMENT }, 69 { MNTOPT_NOEXEC, MS_NOEXEC, ZS_COMMENT }, 70 { MNTOPT_EXEC, MS_COMMENT, ZS_COMMENT }, 71 { MNTOPT_GROUP, MS_GROUP, ZS_COMMENT }, 72 { MNTOPT_NETDEV, MS_COMMENT, ZS_COMMENT }, 73 { MNTOPT_NOFAIL, MS_COMMENT, ZS_COMMENT }, 74 { MNTOPT_NOSUID, MS_NOSUID, ZS_COMMENT }, 75 { MNTOPT_SUID, MS_COMMENT, ZS_COMMENT }, 76 { MNTOPT_OWNER, MS_OWNER, ZS_COMMENT }, 77 { MNTOPT_REMOUNT, MS_REMOUNT, ZS_COMMENT }, 78 { MNTOPT_RO, MS_RDONLY, ZS_COMMENT }, 79 { MNTOPT_RW, MS_COMMENT, ZS_COMMENT }, 80 { MNTOPT_SYNC, MS_SYNCHRONOUS, ZS_COMMENT }, 81 { MNTOPT_USER, MS_USERS, ZS_COMMENT }, 82 { MNTOPT_USERS, MS_USERS, ZS_COMMENT }, 83 /* acl flags passed with util-linux-2.24 mount command */ 84 { MNTOPT_ACL, MS_POSIXACL, ZS_COMMENT }, 85 { MNTOPT_NOACL, MS_COMMENT, ZS_COMMENT }, 86 { MNTOPT_POSIXACL, MS_POSIXACL, ZS_COMMENT }, 87 /* 88 * Case sensitive options are just listed here to silently 89 * ignore the error if passed with zfs mount command. 90 */ 91 { MNTOPT_CASESENSITIVE, MS_COMMENT, ZS_COMMENT }, 92 { MNTOPT_CASEINSENSITIVE, MS_COMMENT, ZS_COMMENT }, 93 { MNTOPT_CASEMIXED, MS_COMMENT, ZS_COMMENT }, 94 #ifdef MS_NOATIME 95 { MNTOPT_NOATIME, MS_NOATIME, ZS_COMMENT }, 96 { MNTOPT_ATIME, MS_COMMENT, ZS_COMMENT }, 97 #endif 98 #ifdef MS_NODIRATIME 99 { MNTOPT_NODIRATIME, MS_NODIRATIME, ZS_COMMENT }, 100 { MNTOPT_DIRATIME, MS_COMMENT, ZS_COMMENT }, 101 #endif 102 #ifdef MS_RELATIME 103 { MNTOPT_RELATIME, MS_RELATIME, ZS_COMMENT }, 104 { MNTOPT_NORELATIME, MS_COMMENT, ZS_COMMENT }, 105 #endif 106 #ifdef MS_STRICTATIME 107 { MNTOPT_STRICTATIME, MS_STRICTATIME, ZS_COMMENT }, 108 { MNTOPT_NOSTRICTATIME, MS_COMMENT, ZS_COMMENT }, 109 #endif 110 #ifdef MS_LAZYTIME 111 { MNTOPT_LAZYTIME, MS_LAZYTIME, ZS_COMMENT }, 112 #endif 113 { MNTOPT_CONTEXT, MS_COMMENT, ZS_COMMENT }, 114 { MNTOPT_FSCONTEXT, MS_COMMENT, ZS_COMMENT }, 115 { MNTOPT_DEFCONTEXT, MS_COMMENT, ZS_COMMENT }, 116 { MNTOPT_ROOTCONTEXT, MS_COMMENT, ZS_COMMENT }, 117 #ifdef MS_I_VERSION 118 { MNTOPT_IVERSION, MS_I_VERSION, ZS_COMMENT }, 119 #endif 120 #ifdef MS_MANDLOCK 121 { MNTOPT_NBMAND, MS_MANDLOCK, ZS_COMMENT }, 122 { MNTOPT_NONBMAND, MS_COMMENT, ZS_COMMENT }, 123 #endif 124 /* Valid options not found in mount(8) */ 125 { MNTOPT_BIND, MS_BIND, ZS_COMMENT }, 126 #ifdef MS_REC 127 { MNTOPT_RBIND, MS_BIND|MS_REC, ZS_COMMENT }, 128 #endif 129 { MNTOPT_COMMENT, MS_COMMENT, ZS_COMMENT }, 130 #ifdef MS_NOSUB 131 { MNTOPT_NOSUB, MS_NOSUB, ZS_COMMENT }, 132 #endif 133 #ifdef MS_SILENT 134 { MNTOPT_QUIET, MS_SILENT, ZS_COMMENT }, 135 #endif 136 /* Custom zfs options */ 137 { MNTOPT_XATTR, MS_COMMENT, ZS_COMMENT }, 138 { MNTOPT_NOXATTR, MS_COMMENT, ZS_COMMENT }, 139 { MNTOPT_ZFSUTIL, MS_COMMENT, ZS_ZFSUTIL }, 140 { NULL, 0, 0 } }; 141 142 /* 143 * Break the mount option in to a name/value pair. The name is 144 * validated against the option map and mount flags set accordingly. 145 */ 146 static int 147 parse_option(char *mntopt, unsigned long *mntflags, 148 unsigned long *zfsflags, int sloppy) 149 { 150 const option_map_t *opt; 151 char *ptr, *name, *value = NULL; 152 int error = 0; 153 154 name = strdup(mntopt); 155 if (name == NULL) 156 return (ENOMEM); 157 158 for (ptr = name; ptr && *ptr; ptr++) { 159 if (*ptr == '=') { 160 *ptr = '\0'; 161 value = ptr+1; 162 VERIFY3P(value, !=, NULL); 163 break; 164 } 165 } 166 167 for (opt = option_map; opt->name != NULL; opt++) { 168 if (strncmp(name, opt->name, strlen(name)) == 0) { 169 *mntflags |= opt->mntmask; 170 *zfsflags |= opt->zfsmask; 171 error = 0; 172 goto out; 173 } 174 } 175 176 if (!sloppy) 177 error = ENOENT; 178 out: 179 /* If required further process on the value may be done here */ 180 free(name); 181 return (error); 182 } 183 184 /* 185 * Translate the mount option string in to MS_* mount flags for the 186 * kernel vfs. When sloppy is non-zero unknown options will be ignored 187 * otherwise they are considered fatal are copied in to badopt. 188 */ 189 int 190 zfs_parse_mount_options(const char *mntopts, unsigned long *mntflags, 191 unsigned long *zfsflags, int sloppy, char *badopt, char *mtabopt) 192 { 193 int error = 0, quote = 0, flag = 0, count = 0; 194 char *ptr, *opt, *opts; 195 196 opts = strdup(mntopts); 197 if (opts == NULL) 198 return (ENOMEM); 199 200 *mntflags = 0; 201 opt = NULL; 202 203 /* 204 * Scan through all mount options which must be comma delimited. 205 * We must be careful to notice regions which are double quoted 206 * and skip commas in these regions. Each option is then checked 207 * to determine if it is a known option. 208 */ 209 for (ptr = opts; ptr && !flag; ptr++) { 210 if (opt == NULL) 211 opt = ptr; 212 213 if (*ptr == '"') 214 quote = !quote; 215 216 if (quote) 217 continue; 218 219 if (*ptr == '\0') 220 flag = 1; 221 222 if ((*ptr == ',') || (*ptr == '\0')) { 223 *ptr = '\0'; 224 225 error = parse_option(opt, mntflags, zfsflags, sloppy); 226 if (error) { 227 strcpy(badopt, opt); 228 goto out; 229 230 } 231 232 if (!(*mntflags & MS_REMOUNT) && 233 !(*zfsflags & ZS_ZFSUTIL) && 234 mtabopt != NULL) { 235 if (count > 0) 236 strlcat(mtabopt, ",", MNT_LINE_MAX); 237 238 strlcat(mtabopt, opt, MNT_LINE_MAX); 239 count++; 240 } 241 242 opt = NULL; 243 } 244 } 245 246 out: 247 free(opts); 248 return (error); 249 } 250 251 static void 252 append_mntopt(const char *name, const char *val, char *mntopts, 253 char *mtabopt, boolean_t quote) 254 { 255 char tmp[MNT_LINE_MAX]; 256 257 snprintf(tmp, MNT_LINE_MAX, quote ? ",%s=\"%s\"" : ",%s=%s", name, val); 258 259 if (mntopts) 260 strlcat(mntopts, tmp, MNT_LINE_MAX); 261 262 if (mtabopt) 263 strlcat(mtabopt, tmp, MNT_LINE_MAX); 264 } 265 266 static void 267 zfs_selinux_setcontext(zfs_handle_t *zhp, zfs_prop_t zpt, const char *name, 268 char *mntopts, char *mtabopt) 269 { 270 char context[ZFS_MAXPROPLEN]; 271 272 if (zfs_prop_get(zhp, zpt, context, sizeof (context), 273 NULL, NULL, 0, B_FALSE) == 0) { 274 if (strcmp(context, "none") != 0) 275 append_mntopt(name, context, mntopts, mtabopt, B_TRUE); 276 } 277 } 278 279 void 280 zfs_adjust_mount_options(zfs_handle_t *zhp, const char *mntpoint, 281 char *mntopts, char *mtabopt) 282 { 283 char prop[ZFS_MAXPROPLEN]; 284 285 /* 286 * Checks to see if the ZFS_PROP_SELINUX_CONTEXT exists 287 * if it does, create a tmp variable in case it's needed 288 * checks to see if the selinux context is set to the default 289 * if it is, allow the setting of the other context properties 290 * this is needed because the 'context' property overrides others 291 * if it is not the default, set the 'context' property 292 */ 293 if (zfs_prop_get(zhp, ZFS_PROP_SELINUX_CONTEXT, prop, sizeof (prop), 294 NULL, NULL, 0, B_FALSE) == 0) { 295 if (strcmp(prop, "none") == 0) { 296 zfs_selinux_setcontext(zhp, ZFS_PROP_SELINUX_FSCONTEXT, 297 MNTOPT_FSCONTEXT, mntopts, mtabopt); 298 zfs_selinux_setcontext(zhp, ZFS_PROP_SELINUX_DEFCONTEXT, 299 MNTOPT_DEFCONTEXT, mntopts, mtabopt); 300 zfs_selinux_setcontext(zhp, 301 ZFS_PROP_SELINUX_ROOTCONTEXT, MNTOPT_ROOTCONTEXT, 302 mntopts, mtabopt); 303 } else { 304 append_mntopt(MNTOPT_CONTEXT, prop, 305 mntopts, mtabopt, B_TRUE); 306 } 307 } 308 309 /* A hint used to determine an auto-mounted snapshot mount point */ 310 append_mntopt(MNTOPT_MNTPOINT, mntpoint, mntopts, NULL, B_FALSE); 311 } 312 313 /* 314 * By default the filesystem by preparing the mount options (i.e. parsing 315 * some flags from the "opts" parameter into the "flags" parameter) and then 316 * directly calling the system call mount(2). We don't need the mount utility 317 * or update /etc/mtab, because this is a symlink on all modern systems. 318 * 319 * If the environment variable ZFS_MOUNT_HELPER is set, we fall back to the 320 * previous behavior: 321 * The filesystem is mounted by invoking the system mount utility rather 322 * than by the system call mount(2). This ensures that the /etc/mtab 323 * file is correctly locked for the update. Performing our own locking 324 * and /etc/mtab update requires making an unsafe assumption about how 325 * the mount utility performs its locking. Unfortunately, this also means 326 * in the case of a mount failure we do not have the exact errno. We must 327 * make due with return value from the mount process. 328 */ 329 int 330 do_mount(zfs_handle_t *zhp, const char *mntpt, const char *opts, int flags) 331 { 332 const char *src = zfs_get_name(zhp); 333 int error = 0; 334 335 if (!libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) { 336 char badopt[MNT_LINE_MAX] = {0}; 337 unsigned long mntflags = flags, zfsflags = 0; 338 char myopts[MNT_LINE_MAX] = {0}; 339 340 if (zfs_parse_mount_options(opts, &mntflags, 341 &zfsflags, 0, badopt, NULL)) { 342 return (EINVAL); 343 } 344 strlcat(myopts, opts, MNT_LINE_MAX); 345 zfs_adjust_mount_options(zhp, mntpt, myopts, NULL); 346 if (mount(src, mntpt, MNTTYPE_ZFS, mntflags, myopts)) { 347 return (errno); 348 } 349 } else { 350 char *argv[9] = { 351 (char *)"/bin/mount", 352 (char *)"--no-canonicalize", 353 (char *)"-t", (char *)MNTTYPE_ZFS, 354 (char *)"-o", (char *)opts, 355 (char *)src, 356 (char *)mntpt, 357 (char *)NULL }; 358 359 /* Return only the most critical mount error */ 360 error = libzfs_run_process(argv[0], argv, 361 STDOUT_VERBOSE|STDERR_VERBOSE); 362 if (error) { 363 if (error & MOUNT_FILEIO) { 364 error = EIO; 365 } else if (error & MOUNT_USER) { 366 error = EINTR; 367 } else if (error & MOUNT_SOFTWARE) { 368 error = EPIPE; 369 } else if (error & MOUNT_BUSY) { 370 error = EBUSY; 371 } else if (error & MOUNT_SYSERR) { 372 error = EAGAIN; 373 } else if (error & MOUNT_USAGE) { 374 error = EINVAL; 375 } else 376 error = ENXIO; /* Generic error */ 377 } 378 } 379 380 return (error); 381 } 382 383 int 384 do_unmount(zfs_handle_t *zhp, const char *mntpt, int flags) 385 { 386 (void) zhp; 387 388 if (!libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) { 389 int rv = umount2(mntpt, flags); 390 391 return (rv < 0 ? errno : 0); 392 } 393 394 char *argv[7] = { 395 (char *)"/bin/umount", 396 (char *)"-t", (char *)MNTTYPE_ZFS, 397 NULL, NULL, NULL, NULL }; 398 int rc, count = 3; 399 400 if (flags & MS_FORCE) 401 argv[count++] = (char *)"-f"; 402 403 if (flags & MS_DETACH) 404 argv[count++] = (char *)"-l"; 405 406 argv[count] = (char *)mntpt; 407 rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE); 408 409 return (rc ? EINVAL : 0); 410 } 411 412 int 413 zfs_mount_delegation_check(void) 414 { 415 return ((geteuid() != 0) ? EACCES : 0); 416 } 417 418 /* Called from the tail end of zpool_disable_datasets() */ 419 void 420 zpool_disable_datasets_os(zpool_handle_t *zhp, boolean_t force) 421 { 422 (void) zhp, (void) force; 423 } 424 425 /* Called from the tail end of zfs_unmount() */ 426 void 427 zpool_disable_volume_os(const char *name) 428 { 429 (void) name; 430 }
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