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 30char *gfs2_sys_margs; 31spinlock_t gfs2_sys_margs_lock; 32 33static 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 38static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 39{ 40 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 41} 42 43static 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 54static 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 80static 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 86static 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 100static 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 113static 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 125static 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 138static 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 152static 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 166struct 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) \ 173static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 174 175GFS2_ATTR(id, 0444, id_show, NULL); 176GFS2_ATTR(fsname, 0444, fsname_show, NULL); 177GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 178GFS2_ATTR(shrink, 0200, NULL, shrink_store); 179GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 180GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 181GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 182GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 183GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 184 185static 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 198static 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 206static 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 214static struct sysfs_ops gfs2_attr_ops = { 215 .show = gfs2_attr_show, 216 .store = gfs2_attr_store, 217}; 218 219static struct kobj_type gfs2_ktype = { 220 .default_attrs = gfs2_attrs, 221 .sysfs_ops = &gfs2_attr_ops, 222}; 223 224static struct kset gfs2_kset = { 225 .kobj = {.name = "gfs2"}, 226 .ktype = &gfs2_ktype, 227}; 228 229/* 230 * display struct lm_lockstruct fields 231 */ 232 233struct lockstruct_attr { 234 struct attribute attr; 235 ssize_t (*show)(struct gfs2_sbd *, char *); 236}; 237 238#define LOCKSTRUCT_ATTR(name, fmt) \ 239static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 240{ \ 241 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \ 242} \ 243static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name) 244 245LOCKSTRUCT_ATTR(jid, "%u\n"); 246LOCKSTRUCT_ATTR(first, "%u\n"); 247LOCKSTRUCT_ATTR(lvb_size, "%u\n"); 248LOCKSTRUCT_ATTR(flags, "%d\n"); 249 250static struct attribute *lockstruct_attrs[] = { 251 &lockstruct_attr_jid.attr, 252 &lockstruct_attr_first.attr, 253 &lockstruct_attr_lvb_size.attr, 254 &lockstruct_attr_flags.attr, 255 NULL, 256}; 257 258/* 259 * display struct gfs2_args fields 260 */ 261 262struct args_attr { 263 struct attribute attr; 264 ssize_t (*show)(struct gfs2_sbd *, char *); 265}; 266 267#define ARGS_ATTR(name, fmt) \ 268static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 269{ \ 270 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \ 271} \ 272static struct args_attr args_attr_##name = __ATTR_RO(name) 273 274ARGS_ATTR(lockproto, "%s\n"); 275ARGS_ATTR(locktable, "%s\n"); 276ARGS_ATTR(hostdata, "%s\n"); 277ARGS_ATTR(spectator, "%d\n"); 278ARGS_ATTR(ignore_local_fs, "%d\n"); 279ARGS_ATTR(localcaching, "%d\n"); 280ARGS_ATTR(localflocks, "%d\n"); 281ARGS_ATTR(debug, "%d\n"); 282ARGS_ATTR(upgrade, "%d\n"); 283ARGS_ATTR(num_glockd, "%u\n"); 284ARGS_ATTR(posix_acl, "%d\n"); 285ARGS_ATTR(quota, "%u\n"); 286ARGS_ATTR(suiddir, "%d\n"); 287ARGS_ATTR(data, "%d\n"); 288 289/* one oddball doesn't fit the macro mold */ 290static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf) 291{ 292 return snprintf(buf, PAGE_SIZE, "%d\n", 293 !!test_bit(SDF_NOATIME, &sdp->sd_flags)); 294} 295static struct args_attr args_attr_noatime = __ATTR_RO(noatime); 296 297static struct attribute *args_attrs[] = { 298 &args_attr_lockproto.attr, 299 &args_attr_locktable.attr, 300 &args_attr_hostdata.attr, 301 &args_attr_spectator.attr, 302 &args_attr_ignore_local_fs.attr, 303 &args_attr_localcaching.attr, 304 &args_attr_localflocks.attr, 305 &args_attr_debug.attr, 306 &args_attr_upgrade.attr, 307 &args_attr_num_glockd.attr, 308 &args_attr_posix_acl.attr, 309 &args_attr_quota.attr, 310 &args_attr_suiddir.attr, 311 &args_attr_data.attr, 312 &args_attr_noatime.attr, 313 NULL, 314}; 315 316/* 317 * display counters from superblock 318 */ 319 320struct counters_attr { 321 struct attribute attr; 322 ssize_t (*show)(struct gfs2_sbd *, char *); 323}; 324 325#define COUNTERS_ATTR(name, fmt) \ 326static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 327{ \ 328 return snprintf(buf, PAGE_SIZE, fmt, \ 329 (unsigned int)atomic_read(&sdp->sd_##name)); \ 330} \ 331static struct counters_attr counters_attr_##name = __ATTR_RO(name) 332 333COUNTERS_ATTR(glock_count, "%u\n"); 334COUNTERS_ATTR(glock_held_count, "%u\n"); 335COUNTERS_ATTR(inode_count, "%u\n"); 336COUNTERS_ATTR(reclaimed, "%u\n"); 337 338static struct attribute *counters_attrs[] = { 339 &counters_attr_glock_count.attr, 340 &counters_attr_glock_held_count.attr, 341 &counters_attr_inode_count.attr, 342 &counters_attr_reclaimed.attr, 343 NULL, 344}; 345 346/* 347 * get and set struct gfs2_tune fields 348 */ 349 350static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 351{ 352 return snprintf(buf, PAGE_SIZE, "%u %u\n", 353 sdp->sd_tune.gt_quota_scale_num, 354 sdp->sd_tune.gt_quota_scale_den); 355} 356 357static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 358 size_t len) 359{ 360 struct gfs2_tune *gt = &sdp->sd_tune; 361 unsigned int x, y; 362 363 if (!capable(CAP_SYS_ADMIN)) 364 return -EACCES; 365 366 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 367 return -EINVAL; 368 369 spin_lock(>->gt_spin); 370 gt->gt_quota_scale_num = x; 371 gt->gt_quota_scale_den = y; 372 spin_unlock(>->gt_spin); 373 return len; 374} 375 376static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 377 int check_zero, const char *buf, size_t len) 378{ 379 struct gfs2_tune *gt = &sdp->sd_tune; 380 unsigned int x; 381 382 if (!capable(CAP_SYS_ADMIN)) 383 return -EACCES; 384 385 x = simple_strtoul(buf, NULL, 0); 386 387 if (check_zero && !x) 388 return -EINVAL; 389 390 spin_lock(>->gt_spin); 391 *field = x; 392 spin_unlock(>->gt_spin); 393 return len; 394} 395 396struct tune_attr { 397 struct attribute attr; 398 ssize_t (*show)(struct gfs2_sbd *, char *); 399 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 400}; 401 402#define TUNE_ATTR_3(name, show, store) \ 403static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store) 404 405#define TUNE_ATTR_2(name, store) \ 406static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 407{ \ 408 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 409} \ 410TUNE_ATTR_3(name, name##_show, store) 411 412#define TUNE_ATTR(name, check_zero) \ 413static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 414{ \ 415 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 416} \ 417TUNE_ATTR_2(name, name##_store) 418 419#define TUNE_ATTR_DAEMON(name, process) \ 420static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 421{ \ 422 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \ 423 wake_up_process(sdp->sd_##process); \ 424 return r; \ 425} \ 426TUNE_ATTR_2(name, name##_store) 427 428TUNE_ATTR(demote_secs, 0); 429TUNE_ATTR(incore_log_blocks, 0); 430TUNE_ATTR(log_flush_secs, 0); 431TUNE_ATTR(jindex_refresh_secs, 0); 432TUNE_ATTR(quota_warn_period, 0); 433TUNE_ATTR(quota_quantum, 0); 434TUNE_ATTR(atime_quantum, 0); 435TUNE_ATTR(max_readahead, 0); 436TUNE_ATTR(complain_secs, 0); 437TUNE_ATTR(reclaim_limit, 0); 438TUNE_ATTR(statfs_slow, 0); 439TUNE_ATTR(new_files_jdata, 0); 440TUNE_ATTR(new_files_directio, 0); 441TUNE_ATTR(quota_simul_sync, 1); 442TUNE_ATTR(quota_cache_secs, 1); 443TUNE_ATTR(stall_secs, 1); 444TUNE_ATTR(statfs_quantum, 1); 445TUNE_ATTR_DAEMON(scand_secs, scand_process); 446TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process); 447TUNE_ATTR_DAEMON(logd_secs, logd_process); 448TUNE_ATTR_DAEMON(quotad_secs, quotad_process); 449TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 450 451static struct attribute *tune_attrs[] = { 452 &tune_attr_demote_secs.attr, 453 &tune_attr_incore_log_blocks.attr, 454 &tune_attr_log_flush_secs.attr, 455 &tune_attr_jindex_refresh_secs.attr, 456 &tune_attr_quota_warn_period.attr, 457 &tune_attr_quota_quantum.attr, 458 &tune_attr_atime_quantum.attr, 459 &tune_attr_max_readahead.attr, 460 &tune_attr_complain_secs.attr, 461 &tune_attr_reclaim_limit.attr, 462 &tune_attr_statfs_slow.attr, 463 &tune_attr_quota_simul_sync.attr, 464 &tune_attr_quota_cache_secs.attr, 465 &tune_attr_stall_secs.attr, 466 &tune_attr_statfs_quantum.attr, 467 &tune_attr_scand_secs.attr, 468 &tune_attr_recoverd_secs.attr, 469 &tune_attr_logd_secs.attr, 470 &tune_attr_quotad_secs.attr, 471 &tune_attr_quota_scale.attr, 472 &tune_attr_new_files_jdata.attr, 473 &tune_attr_new_files_directio.attr, 474 NULL, 475}; 476 477static struct attribute_group lockstruct_group = { 478 .name = "lockstruct", 479 .attrs = lockstruct_attrs, 480}; 481 482static struct attribute_group counters_group = { 483 .name = "counters", 484 .attrs = counters_attrs, 485}; 486 487static struct attribute_group args_group = { 488 .name = "args", 489 .attrs = args_attrs, 490}; 491 492static struct attribute_group tune_group = { 493 .name = "tune", 494 .attrs = tune_attrs, 495}; 496 497int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 498{ 499 int error; 500 501 sdp->sd_kobj.kset = &gfs2_kset; 502 sdp->sd_kobj.ktype = &gfs2_ktype; 503 504 error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name); 505 if (error) 506 goto fail; 507 508 error = kobject_register(&sdp->sd_kobj); 509 if (error) 510 goto fail; 511 512 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group); 513 if (error) 514 goto fail_reg; 515 516 error = sysfs_create_group(&sdp->sd_kobj, &counters_group); 517 if (error) 518 goto fail_lockstruct; 519 520 error = sysfs_create_group(&sdp->sd_kobj, &args_group); 521 if (error) 522 goto fail_counters; 523 524 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 525 if (error) 526 goto fail_args; 527 528 return 0; 529 530fail_args: 531 sysfs_remove_group(&sdp->sd_kobj, &args_group); 532fail_counters: 533 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 534fail_lockstruct: 535 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 536fail_reg: 537 kobject_unregister(&sdp->sd_kobj); 538fail: 539 fs_err(sdp, "error %d adding sysfs files", error); 540 return error; 541} 542 543void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 544{ 545 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 546 sysfs_remove_group(&sdp->sd_kobj, &args_group); 547 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 548 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 549 kobject_unregister(&sdp->sd_kobj); 550} 551 552int gfs2_sys_init(void) 553{ 554 gfs2_sys_margs = NULL; 555 spin_lock_init(&gfs2_sys_margs_lock); 556 kobj_set_kset_s(&gfs2_kset, fs_subsys); 557 return kset_register(&gfs2_kset); 558} 559 560void gfs2_sys_uninit(void) 561{ 562 kfree(gfs2_sys_margs); 563 kset_unregister(&gfs2_kset); 564} 565