1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/sched.h> 11 #include <linux/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/module.h> 16 #include <linux/kobject.h> 17 #include <linux/gfs2_ondisk.h> 18 #include <linux/lm_interface.h> 19 #include <asm/uaccess.h> 20 21 #include "gfs2.h" 22 #include "incore.h" 23 #include "lm.h" 24 #include "sys.h" 25 #include "super.h" 26 #include "glock.h" 27 #include "quota.h" 28 #include "util.h" 29 30 char *gfs2_sys_margs; 31 spinlock_t gfs2_sys_margs_lock; 32 33 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) 34 { 35 return snprintf(buf, PAGE_SIZE, "%u:%u\n", 36 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); 37 } 38 39 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 40 { 41 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 42 } 43 44 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 45 { 46 unsigned int count; 47 48 mutex_lock(&sdp->sd_freeze_lock); 49 count = sdp->sd_freeze_count; 50 mutex_unlock(&sdp->sd_freeze_lock); 51 52 return snprintf(buf, PAGE_SIZE, "%u\n", count); 53 } 54 55 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 56 { 57 ssize_t ret = len; 58 int error = 0; 59 int n = simple_strtol(buf, NULL, 0); 60 61 if (!capable(CAP_SYS_ADMIN)) 62 return -EACCES; 63 64 switch (n) { 65 case 0: 66 gfs2_unfreeze_fs(sdp); 67 break; 68 case 1: 69 error = gfs2_freeze_fs(sdp); 70 break; 71 default: 72 ret = -EINVAL; 73 } 74 75 if (error) 76 fs_warn(sdp, "freeze %d error %d", n, error); 77 78 return ret; 79 } 80 81 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 82 { 83 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); 84 return snprintf(buf, PAGE_SIZE, "%u\n", b); 85 } 86 87 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 88 { 89 if (!capable(CAP_SYS_ADMIN)) 90 return -EACCES; 91 92 if (simple_strtol(buf, NULL, 0) != 1) 93 return -EINVAL; 94 95 gfs2_lm_withdraw(sdp, 96 "GFS2: fsid=%s: withdrawing from cluster at user's request\n", 97 sdp->sd_fsname); 98 return len; 99 } 100 101 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 102 size_t len) 103 { 104 if (!capable(CAP_SYS_ADMIN)) 105 return -EACCES; 106 107 if (simple_strtol(buf, NULL, 0) != 1) 108 return -EINVAL; 109 110 gfs2_statfs_sync(sdp); 111 return len; 112 } 113 114 static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 115 { 116 if (!capable(CAP_SYS_ADMIN)) 117 return -EACCES; 118 119 if (simple_strtol(buf, NULL, 0) != 1) 120 return -EINVAL; 121 122 gfs2_gl_hash_clear(sdp, NO_WAIT); 123 return len; 124 } 125 126 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 127 size_t len) 128 { 129 if (!capable(CAP_SYS_ADMIN)) 130 return -EACCES; 131 132 if (simple_strtol(buf, NULL, 0) != 1) 133 return -EINVAL; 134 135 gfs2_quota_sync(sdp); 136 return len; 137 } 138 139 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 140 size_t len) 141 { 142 u32 id; 143 144 if (!capable(CAP_SYS_ADMIN)) 145 return -EACCES; 146 147 id = simple_strtoul(buf, NULL, 0); 148 149 gfs2_quota_refresh(sdp, 1, id); 150 return len; 151 } 152 153 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 154 size_t len) 155 { 156 u32 id; 157 158 if (!capable(CAP_SYS_ADMIN)) 159 return -EACCES; 160 161 id = simple_strtoul(buf, NULL, 0); 162 163 gfs2_quota_refresh(sdp, 0, id); 164 return len; 165 } 166 167 struct gfs2_attr { 168 struct attribute attr; 169 ssize_t (*show)(struct gfs2_sbd *, char *); 170 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 171 }; 172 173 #define GFS2_ATTR(name, mode, show, store) \ 174 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 175 176 GFS2_ATTR(id, 0444, id_show, NULL); 177 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 178 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 179 GFS2_ATTR(shrink, 0200, NULL, shrink_store); 180 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 181 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 182 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 183 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 184 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 185 186 static struct attribute *gfs2_attrs[] = { 187 &gfs2_attr_id.attr, 188 &gfs2_attr_fsname.attr, 189 &gfs2_attr_freeze.attr, 190 &gfs2_attr_shrink.attr, 191 &gfs2_attr_withdraw.attr, 192 &gfs2_attr_statfs_sync.attr, 193 &gfs2_attr_quota_sync.attr, 194 &gfs2_attr_quota_refresh_user.attr, 195 &gfs2_attr_quota_refresh_group.attr, 196 NULL, 197 }; 198 199 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, 200 char *buf) 201 { 202 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 203 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 204 return a->show ? a->show(sdp, buf) : 0; 205 } 206 207 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, 208 const char *buf, size_t len) 209 { 210 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 211 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 212 return a->store ? a->store(sdp, buf, len) : len; 213 } 214 215 static struct sysfs_ops gfs2_attr_ops = { 216 .show = gfs2_attr_show, 217 .store = gfs2_attr_store, 218 }; 219 220 static struct kobj_type gfs2_ktype = { 221 .default_attrs = gfs2_attrs, 222 .sysfs_ops = &gfs2_attr_ops, 223 }; 224 225 static struct kset *gfs2_kset; 226 227 /* 228 * display struct lm_lockstruct fields 229 */ 230 231 struct lockstruct_attr { 232 struct attribute attr; 233 ssize_t (*show)(struct gfs2_sbd *, char *); 234 }; 235 236 #define LOCKSTRUCT_ATTR(name, fmt) \ 237 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 238 { \ 239 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \ 240 } \ 241 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name) 242 243 LOCKSTRUCT_ATTR(jid, "%u\n"); 244 LOCKSTRUCT_ATTR(first, "%u\n"); 245 LOCKSTRUCT_ATTR(lvb_size, "%u\n"); 246 LOCKSTRUCT_ATTR(flags, "%d\n"); 247 248 static struct attribute *lockstruct_attrs[] = { 249 &lockstruct_attr_jid.attr, 250 &lockstruct_attr_first.attr, 251 &lockstruct_attr_lvb_size.attr, 252 &lockstruct_attr_flags.attr, 253 NULL, 254 }; 255 256 /* 257 * display struct gfs2_args fields 258 */ 259 260 struct args_attr { 261 struct attribute attr; 262 ssize_t (*show)(struct gfs2_sbd *, char *); 263 }; 264 265 #define ARGS_ATTR(name, fmt) \ 266 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 267 { \ 268 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \ 269 } \ 270 static struct args_attr args_attr_##name = __ATTR_RO(name) 271 272 ARGS_ATTR(lockproto, "%s\n"); 273 ARGS_ATTR(locktable, "%s\n"); 274 ARGS_ATTR(hostdata, "%s\n"); 275 ARGS_ATTR(spectator, "%d\n"); 276 ARGS_ATTR(ignore_local_fs, "%d\n"); 277 ARGS_ATTR(localcaching, "%d\n"); 278 ARGS_ATTR(localflocks, "%d\n"); 279 ARGS_ATTR(debug, "%d\n"); 280 ARGS_ATTR(upgrade, "%d\n"); 281 ARGS_ATTR(num_glockd, "%u\n"); 282 ARGS_ATTR(posix_acl, "%d\n"); 283 ARGS_ATTR(quota, "%u\n"); 284 ARGS_ATTR(suiddir, "%d\n"); 285 ARGS_ATTR(data, "%d\n"); 286 287 /* one oddball doesn't fit the macro mold */ 288 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf) 289 { 290 return snprintf(buf, PAGE_SIZE, "%d\n", 291 !!test_bit(SDF_NOATIME, &sdp->sd_flags)); 292 } 293 static struct args_attr args_attr_noatime = __ATTR_RO(noatime); 294 295 static struct attribute *args_attrs[] = { 296 &args_attr_lockproto.attr, 297 &args_attr_locktable.attr, 298 &args_attr_hostdata.attr, 299 &args_attr_spectator.attr, 300 &args_attr_ignore_local_fs.attr, 301 &args_attr_localcaching.attr, 302 &args_attr_localflocks.attr, 303 &args_attr_debug.attr, 304 &args_attr_upgrade.attr, 305 &args_attr_num_glockd.attr, 306 &args_attr_posix_acl.attr, 307 &args_attr_quota.attr, 308 &args_attr_suiddir.attr, 309 &args_attr_data.attr, 310 &args_attr_noatime.attr, 311 NULL, 312 }; 313 314 /* 315 * display counters from superblock 316 */ 317 318 struct counters_attr { 319 struct attribute attr; 320 ssize_t (*show)(struct gfs2_sbd *, char *); 321 }; 322 323 #define COUNTERS_ATTR(name, fmt) \ 324 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 325 { \ 326 return snprintf(buf, PAGE_SIZE, fmt, \ 327 (unsigned int)atomic_read(&sdp->sd_##name)); \ 328 } \ 329 static struct counters_attr counters_attr_##name = __ATTR_RO(name) 330 331 COUNTERS_ATTR(glock_count, "%u\n"); 332 COUNTERS_ATTR(glock_held_count, "%u\n"); 333 COUNTERS_ATTR(inode_count, "%u\n"); 334 COUNTERS_ATTR(reclaimed, "%u\n"); 335 336 static struct attribute *counters_attrs[] = { 337 &counters_attr_glock_count.attr, 338 &counters_attr_glock_held_count.attr, 339 &counters_attr_inode_count.attr, 340 &counters_attr_reclaimed.attr, 341 NULL, 342 }; 343 344 /* 345 * get and set struct gfs2_tune fields 346 */ 347 348 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 349 { 350 return snprintf(buf, PAGE_SIZE, "%u %u\n", 351 sdp->sd_tune.gt_quota_scale_num, 352 sdp->sd_tune.gt_quota_scale_den); 353 } 354 355 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 356 size_t len) 357 { 358 struct gfs2_tune *gt = &sdp->sd_tune; 359 unsigned int x, y; 360 361 if (!capable(CAP_SYS_ADMIN)) 362 return -EACCES; 363 364 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 365 return -EINVAL; 366 367 spin_lock(>->gt_spin); 368 gt->gt_quota_scale_num = x; 369 gt->gt_quota_scale_den = y; 370 spin_unlock(>->gt_spin); 371 return len; 372 } 373 374 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 375 int check_zero, const char *buf, size_t len) 376 { 377 struct gfs2_tune *gt = &sdp->sd_tune; 378 unsigned int x; 379 380 if (!capable(CAP_SYS_ADMIN)) 381 return -EACCES; 382 383 x = simple_strtoul(buf, NULL, 0); 384 385 if (check_zero && !x) 386 return -EINVAL; 387 388 spin_lock(>->gt_spin); 389 *field = x; 390 spin_unlock(>->gt_spin); 391 return len; 392 } 393 394 struct tune_attr { 395 struct attribute attr; 396 ssize_t (*show)(struct gfs2_sbd *, char *); 397 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 398 }; 399 400 #define TUNE_ATTR_3(name, show, store) \ 401 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store) 402 403 #define TUNE_ATTR_2(name, store) \ 404 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 405 { \ 406 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 407 } \ 408 TUNE_ATTR_3(name, name##_show, store) 409 410 #define TUNE_ATTR(name, check_zero) \ 411 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 412 { \ 413 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 414 } \ 415 TUNE_ATTR_2(name, name##_store) 416 417 #define TUNE_ATTR_DAEMON(name, process) \ 418 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 419 { \ 420 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \ 421 wake_up_process(sdp->sd_##process); \ 422 return r; \ 423 } \ 424 TUNE_ATTR_2(name, name##_store) 425 426 TUNE_ATTR(demote_secs, 0); 427 TUNE_ATTR(incore_log_blocks, 0); 428 TUNE_ATTR(log_flush_secs, 0); 429 TUNE_ATTR(quota_warn_period, 0); 430 TUNE_ATTR(quota_quantum, 0); 431 TUNE_ATTR(atime_quantum, 0); 432 TUNE_ATTR(max_readahead, 0); 433 TUNE_ATTR(complain_secs, 0); 434 TUNE_ATTR(statfs_slow, 0); 435 TUNE_ATTR(new_files_jdata, 0); 436 TUNE_ATTR(new_files_directio, 0); 437 TUNE_ATTR(quota_simul_sync, 1); 438 TUNE_ATTR(quota_cache_secs, 1); 439 TUNE_ATTR(stall_secs, 1); 440 TUNE_ATTR(statfs_quantum, 1); 441 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process); 442 TUNE_ATTR_DAEMON(logd_secs, logd_process); 443 TUNE_ATTR_DAEMON(quotad_secs, quotad_process); 444 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 445 446 static struct attribute *tune_attrs[] = { 447 &tune_attr_demote_secs.attr, 448 &tune_attr_incore_log_blocks.attr, 449 &tune_attr_log_flush_secs.attr, 450 &tune_attr_quota_warn_period.attr, 451 &tune_attr_quota_quantum.attr, 452 &tune_attr_atime_quantum.attr, 453 &tune_attr_max_readahead.attr, 454 &tune_attr_complain_secs.attr, 455 &tune_attr_statfs_slow.attr, 456 &tune_attr_quota_simul_sync.attr, 457 &tune_attr_quota_cache_secs.attr, 458 &tune_attr_stall_secs.attr, 459 &tune_attr_statfs_quantum.attr, 460 &tune_attr_recoverd_secs.attr, 461 &tune_attr_logd_secs.attr, 462 &tune_attr_quotad_secs.attr, 463 &tune_attr_quota_scale.attr, 464 &tune_attr_new_files_jdata.attr, 465 &tune_attr_new_files_directio.attr, 466 NULL, 467 }; 468 469 static struct attribute_group lockstruct_group = { 470 .name = "lockstruct", 471 .attrs = lockstruct_attrs, 472 }; 473 474 static struct attribute_group counters_group = { 475 .name = "counters", 476 .attrs = counters_attrs, 477 }; 478 479 static struct attribute_group args_group = { 480 .name = "args", 481 .attrs = args_attrs, 482 }; 483 484 static struct attribute_group tune_group = { 485 .name = "tune", 486 .attrs = tune_attrs, 487 }; 488 489 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 490 { 491 int error; 492 493 sdp->sd_kobj.kset = gfs2_kset; 494 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 495 "%s", sdp->sd_table_name); 496 if (error) 497 goto fail; 498 499 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group); 500 if (error) 501 goto fail_reg; 502 503 error = sysfs_create_group(&sdp->sd_kobj, &counters_group); 504 if (error) 505 goto fail_lockstruct; 506 507 error = sysfs_create_group(&sdp->sd_kobj, &args_group); 508 if (error) 509 goto fail_counters; 510 511 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 512 if (error) 513 goto fail_args; 514 515 kobject_uevent(&sdp->sd_kobj, KOBJ_ADD); 516 return 0; 517 518 fail_args: 519 sysfs_remove_group(&sdp->sd_kobj, &args_group); 520 fail_counters: 521 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 522 fail_lockstruct: 523 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 524 fail_reg: 525 kobject_put(&sdp->sd_kobj); 526 fail: 527 fs_err(sdp, "error %d adding sysfs files", error); 528 return error; 529 } 530 531 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 532 { 533 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 534 sysfs_remove_group(&sdp->sd_kobj, &args_group); 535 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 536 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 537 kobject_put(&sdp->sd_kobj); 538 } 539 540 int gfs2_sys_init(void) 541 { 542 gfs2_sys_margs = NULL; 543 spin_lock_init(&gfs2_sys_margs_lock); 544 gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj); 545 if (!gfs2_kset) 546 return -ENOMEM; 547 return 0; 548 } 549 550 void gfs2_sys_uninit(void) 551 { 552 kfree(gfs2_sys_margs); 553 kset_unregister(gfs2_kset); 554 } 555 556