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 "sys.h" 24 #include "super.h" 25 #include "glock.h" 26 #include "quota.h" 27 #include "util.h" 28 29 char *gfs2_sys_margs; 30 spinlock_t gfs2_sys_margs_lock; 31 32 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) 33 { 34 return snprintf(buf, PAGE_SIZE, "%u:%u\n", 35 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); 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 quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 114 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_quota_sync(sdp); 123 return len; 124 } 125 126 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 127 size_t len) 128 { 129 u32 id; 130 131 if (!capable(CAP_SYS_ADMIN)) 132 return -EACCES; 133 134 id = simple_strtoul(buf, NULL, 0); 135 136 gfs2_quota_refresh(sdp, 1, id); 137 return len; 138 } 139 140 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 141 size_t len) 142 { 143 u32 id; 144 145 if (!capable(CAP_SYS_ADMIN)) 146 return -EACCES; 147 148 id = simple_strtoul(buf, NULL, 0); 149 150 gfs2_quota_refresh(sdp, 0, id); 151 return len; 152 } 153 154 struct gfs2_attr { 155 struct attribute attr; 156 ssize_t (*show)(struct gfs2_sbd *, char *); 157 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 158 }; 159 160 #define GFS2_ATTR(name, mode, show, store) \ 161 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 162 163 GFS2_ATTR(id, 0444, id_show, NULL); 164 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 165 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 166 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 167 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 168 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 169 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 170 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 171 172 static struct attribute *gfs2_attrs[] = { 173 &gfs2_attr_id.attr, 174 &gfs2_attr_fsname.attr, 175 &gfs2_attr_freeze.attr, 176 &gfs2_attr_withdraw.attr, 177 &gfs2_attr_statfs_sync.attr, 178 &gfs2_attr_quota_sync.attr, 179 &gfs2_attr_quota_refresh_user.attr, 180 &gfs2_attr_quota_refresh_group.attr, 181 NULL, 182 }; 183 184 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, 185 char *buf) 186 { 187 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 188 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 189 return a->show ? a->show(sdp, buf) : 0; 190 } 191 192 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, 193 const char *buf, size_t len) 194 { 195 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 196 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 197 return a->store ? a->store(sdp, buf, len) : len; 198 } 199 200 static struct sysfs_ops gfs2_attr_ops = { 201 .show = gfs2_attr_show, 202 .store = gfs2_attr_store, 203 }; 204 205 static struct kobj_type gfs2_ktype = { 206 .default_attrs = gfs2_attrs, 207 .sysfs_ops = &gfs2_attr_ops, 208 }; 209 210 static struct kset *gfs2_kset; 211 212 /* 213 * display struct lm_lockstruct fields 214 */ 215 216 struct lockstruct_attr { 217 struct attribute attr; 218 ssize_t (*show)(struct gfs2_sbd *, char *); 219 }; 220 221 #define LOCKSTRUCT_ATTR(name, fmt) \ 222 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 223 { \ 224 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \ 225 } \ 226 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name) 227 228 LOCKSTRUCT_ATTR(jid, "%u\n"); 229 LOCKSTRUCT_ATTR(first, "%u\n"); 230 LOCKSTRUCT_ATTR(lvb_size, "%u\n"); 231 LOCKSTRUCT_ATTR(flags, "%d\n"); 232 233 static struct attribute *lockstruct_attrs[] = { 234 &lockstruct_attr_jid.attr, 235 &lockstruct_attr_first.attr, 236 &lockstruct_attr_lvb_size.attr, 237 &lockstruct_attr_flags.attr, 238 NULL, 239 }; 240 241 /* 242 * display struct gfs2_args fields 243 */ 244 245 struct args_attr { 246 struct attribute attr; 247 ssize_t (*show)(struct gfs2_sbd *, char *); 248 }; 249 250 #define ARGS_ATTR(name, fmt) \ 251 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 252 { \ 253 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \ 254 } \ 255 static struct args_attr args_attr_##name = __ATTR_RO(name) 256 257 ARGS_ATTR(lockproto, "%s\n"); 258 ARGS_ATTR(locktable, "%s\n"); 259 ARGS_ATTR(hostdata, "%s\n"); 260 ARGS_ATTR(spectator, "%d\n"); 261 ARGS_ATTR(ignore_local_fs, "%d\n"); 262 ARGS_ATTR(localcaching, "%d\n"); 263 ARGS_ATTR(localflocks, "%d\n"); 264 ARGS_ATTR(debug, "%d\n"); 265 ARGS_ATTR(upgrade, "%d\n"); 266 ARGS_ATTR(num_glockd, "%u\n"); 267 ARGS_ATTR(posix_acl, "%d\n"); 268 ARGS_ATTR(quota, "%u\n"); 269 ARGS_ATTR(suiddir, "%d\n"); 270 ARGS_ATTR(data, "%d\n"); 271 272 static struct attribute *args_attrs[] = { 273 &args_attr_lockproto.attr, 274 &args_attr_locktable.attr, 275 &args_attr_hostdata.attr, 276 &args_attr_spectator.attr, 277 &args_attr_ignore_local_fs.attr, 278 &args_attr_localcaching.attr, 279 &args_attr_localflocks.attr, 280 &args_attr_debug.attr, 281 &args_attr_upgrade.attr, 282 &args_attr_num_glockd.attr, 283 &args_attr_posix_acl.attr, 284 &args_attr_quota.attr, 285 &args_attr_suiddir.attr, 286 &args_attr_data.attr, 287 NULL, 288 }; 289 290 /* 291 * display counters from superblock 292 */ 293 294 struct counters_attr { 295 struct attribute attr; 296 ssize_t (*show)(struct gfs2_sbd *, char *); 297 }; 298 299 #define COUNTERS_ATTR(name, fmt) \ 300 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 301 { \ 302 return snprintf(buf, PAGE_SIZE, fmt, \ 303 (unsigned int)atomic_read(&sdp->sd_##name)); \ 304 } \ 305 static struct counters_attr counters_attr_##name = __ATTR_RO(name) 306 307 COUNTERS_ATTR(reclaimed, "%u\n"); 308 309 static struct attribute *counters_attrs[] = { 310 &counters_attr_reclaimed.attr, 311 NULL, 312 }; 313 314 /* 315 * get and set struct gfs2_tune fields 316 */ 317 318 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 319 { 320 return snprintf(buf, PAGE_SIZE, "%u %u\n", 321 sdp->sd_tune.gt_quota_scale_num, 322 sdp->sd_tune.gt_quota_scale_den); 323 } 324 325 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 326 size_t len) 327 { 328 struct gfs2_tune *gt = &sdp->sd_tune; 329 unsigned int x, y; 330 331 if (!capable(CAP_SYS_ADMIN)) 332 return -EACCES; 333 334 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 335 return -EINVAL; 336 337 spin_lock(>->gt_spin); 338 gt->gt_quota_scale_num = x; 339 gt->gt_quota_scale_den = y; 340 spin_unlock(>->gt_spin); 341 return len; 342 } 343 344 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 345 int check_zero, const char *buf, size_t len) 346 { 347 struct gfs2_tune *gt = &sdp->sd_tune; 348 unsigned int x; 349 350 if (!capable(CAP_SYS_ADMIN)) 351 return -EACCES; 352 353 x = simple_strtoul(buf, NULL, 0); 354 355 if (check_zero && !x) 356 return -EINVAL; 357 358 spin_lock(>->gt_spin); 359 *field = x; 360 spin_unlock(>->gt_spin); 361 return len; 362 } 363 364 struct tune_attr { 365 struct attribute attr; 366 ssize_t (*show)(struct gfs2_sbd *, char *); 367 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 368 }; 369 370 #define TUNE_ATTR_3(name, show, store) \ 371 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store) 372 373 #define TUNE_ATTR_2(name, store) \ 374 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 375 { \ 376 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 377 } \ 378 TUNE_ATTR_3(name, name##_show, store) 379 380 #define TUNE_ATTR(name, check_zero) \ 381 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 382 { \ 383 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 384 } \ 385 TUNE_ATTR_2(name, name##_store) 386 387 #define TUNE_ATTR_DAEMON(name, process) \ 388 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 389 { \ 390 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \ 391 wake_up_process(sdp->sd_##process); \ 392 return r; \ 393 } \ 394 TUNE_ATTR_2(name, name##_store) 395 396 TUNE_ATTR(demote_secs, 0); 397 TUNE_ATTR(incore_log_blocks, 0); 398 TUNE_ATTR(log_flush_secs, 0); 399 TUNE_ATTR(quota_warn_period, 0); 400 TUNE_ATTR(quota_quantum, 0); 401 TUNE_ATTR(max_readahead, 0); 402 TUNE_ATTR(complain_secs, 0); 403 TUNE_ATTR(statfs_slow, 0); 404 TUNE_ATTR(new_files_jdata, 0); 405 TUNE_ATTR(quota_simul_sync, 1); 406 TUNE_ATTR(quota_cache_secs, 1); 407 TUNE_ATTR(stall_secs, 1); 408 TUNE_ATTR(statfs_quantum, 1); 409 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process); 410 TUNE_ATTR_DAEMON(logd_secs, logd_process); 411 TUNE_ATTR_DAEMON(quotad_secs, quotad_process); 412 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 413 414 static struct attribute *tune_attrs[] = { 415 &tune_attr_demote_secs.attr, 416 &tune_attr_incore_log_blocks.attr, 417 &tune_attr_log_flush_secs.attr, 418 &tune_attr_quota_warn_period.attr, 419 &tune_attr_quota_quantum.attr, 420 &tune_attr_max_readahead.attr, 421 &tune_attr_complain_secs.attr, 422 &tune_attr_statfs_slow.attr, 423 &tune_attr_quota_simul_sync.attr, 424 &tune_attr_quota_cache_secs.attr, 425 &tune_attr_stall_secs.attr, 426 &tune_attr_statfs_quantum.attr, 427 &tune_attr_recoverd_secs.attr, 428 &tune_attr_logd_secs.attr, 429 &tune_attr_quotad_secs.attr, 430 &tune_attr_quota_scale.attr, 431 &tune_attr_new_files_jdata.attr, 432 NULL, 433 }; 434 435 static struct attribute_group lockstruct_group = { 436 .name = "lockstruct", 437 .attrs = lockstruct_attrs, 438 }; 439 440 static struct attribute_group counters_group = { 441 .name = "counters", 442 .attrs = counters_attrs, 443 }; 444 445 static struct attribute_group args_group = { 446 .name = "args", 447 .attrs = args_attrs, 448 }; 449 450 static struct attribute_group tune_group = { 451 .name = "tune", 452 .attrs = tune_attrs, 453 }; 454 455 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 456 { 457 int error; 458 459 sdp->sd_kobj.kset = gfs2_kset; 460 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 461 "%s", sdp->sd_table_name); 462 if (error) 463 goto fail; 464 465 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group); 466 if (error) 467 goto fail_reg; 468 469 error = sysfs_create_group(&sdp->sd_kobj, &counters_group); 470 if (error) 471 goto fail_lockstruct; 472 473 error = sysfs_create_group(&sdp->sd_kobj, &args_group); 474 if (error) 475 goto fail_counters; 476 477 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 478 if (error) 479 goto fail_args; 480 481 kobject_uevent(&sdp->sd_kobj, KOBJ_ADD); 482 return 0; 483 484 fail_args: 485 sysfs_remove_group(&sdp->sd_kobj, &args_group); 486 fail_counters: 487 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 488 fail_lockstruct: 489 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 490 fail_reg: 491 kobject_put(&sdp->sd_kobj); 492 fail: 493 fs_err(sdp, "error %d adding sysfs files", error); 494 return error; 495 } 496 497 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 498 { 499 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 500 sysfs_remove_group(&sdp->sd_kobj, &args_group); 501 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 502 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 503 kobject_put(&sdp->sd_kobj); 504 } 505 506 int gfs2_sys_init(void) 507 { 508 gfs2_sys_margs = NULL; 509 spin_lock_init(&gfs2_sys_margs_lock); 510 gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj); 511 if (!gfs2_kset) 512 return -ENOMEM; 513 return 0; 514 } 515 516 void gfs2_sys_uninit(void) 517 { 518 kfree(gfs2_sys_margs); 519 kset_unregister(gfs2_kset); 520 } 521 522