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, "%s\n", sdp->sd_vfs->s_id); 36 } 37 38 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 39 { 40 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 41 } 42 43 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 44 { 45 unsigned int count; 46 47 mutex_lock(&sdp->sd_freeze_lock); 48 count = sdp->sd_freeze_count; 49 mutex_unlock(&sdp->sd_freeze_lock); 50 51 return snprintf(buf, PAGE_SIZE, "%u\n", count); 52 } 53 54 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 55 { 56 ssize_t ret = len; 57 int error = 0; 58 int n = simple_strtol(buf, NULL, 0); 59 60 if (!capable(CAP_SYS_ADMIN)) 61 return -EACCES; 62 63 switch (n) { 64 case 0: 65 gfs2_unfreeze_fs(sdp); 66 break; 67 case 1: 68 error = gfs2_freeze_fs(sdp); 69 break; 70 default: 71 ret = -EINVAL; 72 } 73 74 if (error) 75 fs_warn(sdp, "freeze %d error %d", n, error); 76 77 return ret; 78 } 79 80 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 81 { 82 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); 83 return snprintf(buf, PAGE_SIZE, "%u\n", b); 84 } 85 86 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 87 { 88 if (!capable(CAP_SYS_ADMIN)) 89 return -EACCES; 90 91 if (simple_strtol(buf, NULL, 0) != 1) 92 return -EINVAL; 93 94 gfs2_lm_withdraw(sdp, 95 "GFS2: fsid=%s: withdrawing from cluster at user's request\n", 96 sdp->sd_fsname); 97 return len; 98 } 99 100 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 101 size_t len) 102 { 103 if (!capable(CAP_SYS_ADMIN)) 104 return -EACCES; 105 106 if (simple_strtol(buf, NULL, 0) != 1) 107 return -EINVAL; 108 109 gfs2_statfs_sync(sdp); 110 return len; 111 } 112 113 static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 114 { 115 if (!capable(CAP_SYS_ADMIN)) 116 return -EACCES; 117 118 if (simple_strtol(buf, NULL, 0) != 1) 119 return -EINVAL; 120 121 gfs2_gl_hash_clear(sdp, NO_WAIT); 122 return len; 123 } 124 125 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 126 size_t len) 127 { 128 if (!capable(CAP_SYS_ADMIN)) 129 return -EACCES; 130 131 if (simple_strtol(buf, NULL, 0) != 1) 132 return -EINVAL; 133 134 gfs2_quota_sync(sdp); 135 return len; 136 } 137 138 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 139 size_t len) 140 { 141 u32 id; 142 143 if (!capable(CAP_SYS_ADMIN)) 144 return -EACCES; 145 146 id = simple_strtoul(buf, NULL, 0); 147 148 gfs2_quota_refresh(sdp, 1, id); 149 return len; 150 } 151 152 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 153 size_t len) 154 { 155 u32 id; 156 157 if (!capable(CAP_SYS_ADMIN)) 158 return -EACCES; 159 160 id = simple_strtoul(buf, NULL, 0); 161 162 gfs2_quota_refresh(sdp, 0, id); 163 return len; 164 } 165 166 struct gfs2_attr { 167 struct attribute attr; 168 ssize_t (*show)(struct gfs2_sbd *, char *); 169 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 170 }; 171 172 #define GFS2_ATTR(name, mode, show, store) \ 173 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 174 175 GFS2_ATTR(id, 0444, id_show, NULL); 176 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 177 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 178 GFS2_ATTR(shrink, 0200, NULL, shrink_store); 179 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 180 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 181 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 182 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 183 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 184 185 static struct attribute *gfs2_attrs[] = { 186 &gfs2_attr_id.attr, 187 &gfs2_attr_fsname.attr, 188 &gfs2_attr_freeze.attr, 189 &gfs2_attr_shrink.attr, 190 &gfs2_attr_withdraw.attr, 191 &gfs2_attr_statfs_sync.attr, 192 &gfs2_attr_quota_sync.attr, 193 &gfs2_attr_quota_refresh_user.attr, 194 &gfs2_attr_quota_refresh_group.attr, 195 NULL, 196 }; 197 198 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, 199 char *buf) 200 { 201 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 202 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 203 return a->show ? a->show(sdp, buf) : 0; 204 } 205 206 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, 207 const char *buf, size_t len) 208 { 209 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 210 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 211 return a->store ? a->store(sdp, buf, len) : len; 212 } 213 214 static struct sysfs_ops gfs2_attr_ops = { 215 .show = gfs2_attr_show, 216 .store = gfs2_attr_store, 217 }; 218 219 static struct kobj_type gfs2_ktype = { 220 .default_attrs = gfs2_attrs, 221 .sysfs_ops = &gfs2_attr_ops, 222 }; 223 224 static struct kset gfs2_kset = { 225 .subsys = &fs_subsys, 226 .kobj = {.name = "gfs2"}, 227 .ktype = &gfs2_ktype, 228 }; 229 230 /* 231 * display struct lm_lockstruct fields 232 */ 233 234 struct lockstruct_attr { 235 struct attribute attr; 236 ssize_t (*show)(struct gfs2_sbd *, char *); 237 }; 238 239 #define LOCKSTRUCT_ATTR(name, fmt) \ 240 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 241 { \ 242 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \ 243 } \ 244 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name) 245 246 LOCKSTRUCT_ATTR(jid, "%u\n"); 247 LOCKSTRUCT_ATTR(first, "%u\n"); 248 LOCKSTRUCT_ATTR(lvb_size, "%u\n"); 249 LOCKSTRUCT_ATTR(flags, "%d\n"); 250 251 static struct attribute *lockstruct_attrs[] = { 252 &lockstruct_attr_jid.attr, 253 &lockstruct_attr_first.attr, 254 &lockstruct_attr_lvb_size.attr, 255 &lockstruct_attr_flags.attr, 256 NULL, 257 }; 258 259 /* 260 * display struct gfs2_args fields 261 */ 262 263 struct args_attr { 264 struct attribute attr; 265 ssize_t (*show)(struct gfs2_sbd *, char *); 266 }; 267 268 #define ARGS_ATTR(name, fmt) \ 269 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 270 { \ 271 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \ 272 } \ 273 static struct args_attr args_attr_##name = __ATTR_RO(name) 274 275 ARGS_ATTR(lockproto, "%s\n"); 276 ARGS_ATTR(locktable, "%s\n"); 277 ARGS_ATTR(hostdata, "%s\n"); 278 ARGS_ATTR(spectator, "%d\n"); 279 ARGS_ATTR(ignore_local_fs, "%d\n"); 280 ARGS_ATTR(localcaching, "%d\n"); 281 ARGS_ATTR(localflocks, "%d\n"); 282 ARGS_ATTR(debug, "%d\n"); 283 ARGS_ATTR(upgrade, "%d\n"); 284 ARGS_ATTR(num_glockd, "%u\n"); 285 ARGS_ATTR(posix_acl, "%d\n"); 286 ARGS_ATTR(quota, "%u\n"); 287 ARGS_ATTR(suiddir, "%d\n"); 288 ARGS_ATTR(data, "%d\n"); 289 290 /* one oddball doesn't fit the macro mold */ 291 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf) 292 { 293 return snprintf(buf, PAGE_SIZE, "%d\n", 294 !!test_bit(SDF_NOATIME, &sdp->sd_flags)); 295 } 296 static struct args_attr args_attr_noatime = __ATTR_RO(noatime); 297 298 static struct attribute *args_attrs[] = { 299 &args_attr_lockproto.attr, 300 &args_attr_locktable.attr, 301 &args_attr_hostdata.attr, 302 &args_attr_spectator.attr, 303 &args_attr_ignore_local_fs.attr, 304 &args_attr_localcaching.attr, 305 &args_attr_localflocks.attr, 306 &args_attr_debug.attr, 307 &args_attr_upgrade.attr, 308 &args_attr_num_glockd.attr, 309 &args_attr_posix_acl.attr, 310 &args_attr_quota.attr, 311 &args_attr_suiddir.attr, 312 &args_attr_data.attr, 313 &args_attr_noatime.attr, 314 NULL, 315 }; 316 317 /* 318 * display counters from superblock 319 */ 320 321 struct counters_attr { 322 struct attribute attr; 323 ssize_t (*show)(struct gfs2_sbd *, char *); 324 }; 325 326 #define COUNTERS_ATTR(name, fmt) \ 327 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 328 { \ 329 return snprintf(buf, PAGE_SIZE, fmt, \ 330 (unsigned int)atomic_read(&sdp->sd_##name)); \ 331 } \ 332 static struct counters_attr counters_attr_##name = __ATTR_RO(name) 333 334 COUNTERS_ATTR(glock_count, "%u\n"); 335 COUNTERS_ATTR(glock_held_count, "%u\n"); 336 COUNTERS_ATTR(inode_count, "%u\n"); 337 COUNTERS_ATTR(reclaimed, "%u\n"); 338 339 static struct attribute *counters_attrs[] = { 340 &counters_attr_glock_count.attr, 341 &counters_attr_glock_held_count.attr, 342 &counters_attr_inode_count.attr, 343 &counters_attr_reclaimed.attr, 344 NULL, 345 }; 346 347 /* 348 * get and set struct gfs2_tune fields 349 */ 350 351 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 352 { 353 return snprintf(buf, PAGE_SIZE, "%u %u\n", 354 sdp->sd_tune.gt_quota_scale_num, 355 sdp->sd_tune.gt_quota_scale_den); 356 } 357 358 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 359 size_t len) 360 { 361 struct gfs2_tune *gt = &sdp->sd_tune; 362 unsigned int x, y; 363 364 if (!capable(CAP_SYS_ADMIN)) 365 return -EACCES; 366 367 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 368 return -EINVAL; 369 370 spin_lock(>->gt_spin); 371 gt->gt_quota_scale_num = x; 372 gt->gt_quota_scale_den = y; 373 spin_unlock(>->gt_spin); 374 return len; 375 } 376 377 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 378 int check_zero, const char *buf, size_t len) 379 { 380 struct gfs2_tune *gt = &sdp->sd_tune; 381 unsigned int x; 382 383 if (!capable(CAP_SYS_ADMIN)) 384 return -EACCES; 385 386 x = simple_strtoul(buf, NULL, 0); 387 388 if (check_zero && !x) 389 return -EINVAL; 390 391 spin_lock(>->gt_spin); 392 *field = x; 393 spin_unlock(>->gt_spin); 394 return len; 395 } 396 397 struct tune_attr { 398 struct attribute attr; 399 ssize_t (*show)(struct gfs2_sbd *, char *); 400 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 401 }; 402 403 #define TUNE_ATTR_3(name, show, store) \ 404 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store) 405 406 #define TUNE_ATTR_2(name, store) \ 407 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 408 { \ 409 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 410 } \ 411 TUNE_ATTR_3(name, name##_show, store) 412 413 #define TUNE_ATTR(name, check_zero) \ 414 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 415 { \ 416 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 417 } \ 418 TUNE_ATTR_2(name, name##_store) 419 420 #define TUNE_ATTR_DAEMON(name, process) \ 421 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 422 { \ 423 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \ 424 wake_up_process(sdp->sd_##process); \ 425 return r; \ 426 } \ 427 TUNE_ATTR_2(name, name##_store) 428 429 TUNE_ATTR(demote_secs, 0); 430 TUNE_ATTR(incore_log_blocks, 0); 431 TUNE_ATTR(log_flush_secs, 0); 432 TUNE_ATTR(jindex_refresh_secs, 0); 433 TUNE_ATTR(quota_warn_period, 0); 434 TUNE_ATTR(quota_quantum, 0); 435 TUNE_ATTR(atime_quantum, 0); 436 TUNE_ATTR(max_readahead, 0); 437 TUNE_ATTR(complain_secs, 0); 438 TUNE_ATTR(reclaim_limit, 0); 439 TUNE_ATTR(statfs_slow, 0); 440 TUNE_ATTR(new_files_jdata, 0); 441 TUNE_ATTR(new_files_directio, 0); 442 TUNE_ATTR(quota_simul_sync, 1); 443 TUNE_ATTR(quota_cache_secs, 1); 444 TUNE_ATTR(stall_secs, 1); 445 TUNE_ATTR(statfs_quantum, 1); 446 TUNE_ATTR_DAEMON(scand_secs, scand_process); 447 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process); 448 TUNE_ATTR_DAEMON(logd_secs, logd_process); 449 TUNE_ATTR_DAEMON(quotad_secs, quotad_process); 450 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 451 452 static struct attribute *tune_attrs[] = { 453 &tune_attr_demote_secs.attr, 454 &tune_attr_incore_log_blocks.attr, 455 &tune_attr_log_flush_secs.attr, 456 &tune_attr_jindex_refresh_secs.attr, 457 &tune_attr_quota_warn_period.attr, 458 &tune_attr_quota_quantum.attr, 459 &tune_attr_atime_quantum.attr, 460 &tune_attr_max_readahead.attr, 461 &tune_attr_complain_secs.attr, 462 &tune_attr_reclaim_limit.attr, 463 &tune_attr_statfs_slow.attr, 464 &tune_attr_quota_simul_sync.attr, 465 &tune_attr_quota_cache_secs.attr, 466 &tune_attr_stall_secs.attr, 467 &tune_attr_statfs_quantum.attr, 468 &tune_attr_scand_secs.attr, 469 &tune_attr_recoverd_secs.attr, 470 &tune_attr_logd_secs.attr, 471 &tune_attr_quotad_secs.attr, 472 &tune_attr_quota_scale.attr, 473 &tune_attr_new_files_jdata.attr, 474 &tune_attr_new_files_directio.attr, 475 NULL, 476 }; 477 478 static struct attribute_group lockstruct_group = { 479 .name = "lockstruct", 480 .attrs = lockstruct_attrs, 481 }; 482 483 static struct attribute_group counters_group = { 484 .name = "counters", 485 .attrs = counters_attrs, 486 }; 487 488 static struct attribute_group args_group = { 489 .name = "args", 490 .attrs = args_attrs, 491 }; 492 493 static struct attribute_group tune_group = { 494 .name = "tune", 495 .attrs = tune_attrs, 496 }; 497 498 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 499 { 500 int error; 501 502 sdp->sd_kobj.kset = &gfs2_kset; 503 sdp->sd_kobj.ktype = &gfs2_ktype; 504 505 error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name); 506 if (error) 507 goto fail; 508 509 error = kobject_register(&sdp->sd_kobj); 510 if (error) 511 goto fail; 512 513 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group); 514 if (error) 515 goto fail_reg; 516 517 error = sysfs_create_group(&sdp->sd_kobj, &counters_group); 518 if (error) 519 goto fail_lockstruct; 520 521 error = sysfs_create_group(&sdp->sd_kobj, &args_group); 522 if (error) 523 goto fail_counters; 524 525 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 526 if (error) 527 goto fail_args; 528 529 return 0; 530 531 fail_args: 532 sysfs_remove_group(&sdp->sd_kobj, &args_group); 533 fail_counters: 534 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 535 fail_lockstruct: 536 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 537 fail_reg: 538 kobject_unregister(&sdp->sd_kobj); 539 fail: 540 fs_err(sdp, "error %d adding sysfs files", error); 541 return error; 542 } 543 544 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 545 { 546 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 547 sysfs_remove_group(&sdp->sd_kobj, &args_group); 548 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 549 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 550 kobject_unregister(&sdp->sd_kobj); 551 } 552 553 int gfs2_sys_init(void) 554 { 555 gfs2_sys_margs = NULL; 556 spin_lock_init(&gfs2_sys_margs_lock); 557 return kset_register(&gfs2_kset); 558 } 559 560 void gfs2_sys_uninit(void) 561 { 562 kfree(gfs2_sys_margs); 563 kset_unregister(&gfs2_kset); 564 } 565 566