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 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) 30 { 31 return snprintf(buf, PAGE_SIZE, "%u:%u\n", 32 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); 33 } 34 35 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 36 { 37 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 38 } 39 40 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 41 { 42 unsigned int count; 43 44 mutex_lock(&sdp->sd_freeze_lock); 45 count = sdp->sd_freeze_count; 46 mutex_unlock(&sdp->sd_freeze_lock); 47 48 return snprintf(buf, PAGE_SIZE, "%u\n", count); 49 } 50 51 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 52 { 53 ssize_t ret = len; 54 int error = 0; 55 int n = simple_strtol(buf, NULL, 0); 56 57 if (!capable(CAP_SYS_ADMIN)) 58 return -EACCES; 59 60 switch (n) { 61 case 0: 62 gfs2_unfreeze_fs(sdp); 63 break; 64 case 1: 65 error = gfs2_freeze_fs(sdp); 66 break; 67 default: 68 ret = -EINVAL; 69 } 70 71 if (error) 72 fs_warn(sdp, "freeze %d error %d", n, error); 73 74 return ret; 75 } 76 77 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 78 { 79 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); 80 return snprintf(buf, PAGE_SIZE, "%u\n", b); 81 } 82 83 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 84 { 85 if (!capable(CAP_SYS_ADMIN)) 86 return -EACCES; 87 88 if (simple_strtol(buf, NULL, 0) != 1) 89 return -EINVAL; 90 91 gfs2_lm_withdraw(sdp, 92 "GFS2: fsid=%s: withdrawing from cluster at user's request\n", 93 sdp->sd_fsname); 94 return len; 95 } 96 97 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 98 size_t len) 99 { 100 if (!capable(CAP_SYS_ADMIN)) 101 return -EACCES; 102 103 if (simple_strtol(buf, NULL, 0) != 1) 104 return -EINVAL; 105 106 gfs2_statfs_sync(sdp); 107 return len; 108 } 109 110 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 111 size_t len) 112 { 113 if (!capable(CAP_SYS_ADMIN)) 114 return -EACCES; 115 116 if (simple_strtol(buf, NULL, 0) != 1) 117 return -EINVAL; 118 119 gfs2_quota_sync(sdp); 120 return len; 121 } 122 123 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 124 size_t len) 125 { 126 u32 id; 127 128 if (!capable(CAP_SYS_ADMIN)) 129 return -EACCES; 130 131 id = simple_strtoul(buf, NULL, 0); 132 133 gfs2_quota_refresh(sdp, 1, id); 134 return len; 135 } 136 137 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 138 size_t len) 139 { 140 u32 id; 141 142 if (!capable(CAP_SYS_ADMIN)) 143 return -EACCES; 144 145 id = simple_strtoul(buf, NULL, 0); 146 147 gfs2_quota_refresh(sdp, 0, id); 148 return len; 149 } 150 151 struct gfs2_attr { 152 struct attribute attr; 153 ssize_t (*show)(struct gfs2_sbd *, char *); 154 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 155 }; 156 157 #define GFS2_ATTR(name, mode, show, store) \ 158 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 159 160 GFS2_ATTR(id, 0444, id_show, NULL); 161 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 162 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 163 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 164 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 165 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 166 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 167 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 168 169 static struct attribute *gfs2_attrs[] = { 170 &gfs2_attr_id.attr, 171 &gfs2_attr_fsname.attr, 172 &gfs2_attr_freeze.attr, 173 &gfs2_attr_withdraw.attr, 174 &gfs2_attr_statfs_sync.attr, 175 &gfs2_attr_quota_sync.attr, 176 &gfs2_attr_quota_refresh_user.attr, 177 &gfs2_attr_quota_refresh_group.attr, 178 NULL, 179 }; 180 181 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, 182 char *buf) 183 { 184 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 185 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 186 return a->show ? a->show(sdp, buf) : 0; 187 } 188 189 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, 190 const char *buf, size_t len) 191 { 192 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 193 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 194 return a->store ? a->store(sdp, buf, len) : len; 195 } 196 197 static struct sysfs_ops gfs2_attr_ops = { 198 .show = gfs2_attr_show, 199 .store = gfs2_attr_store, 200 }; 201 202 static struct kobj_type gfs2_ktype = { 203 .default_attrs = gfs2_attrs, 204 .sysfs_ops = &gfs2_attr_ops, 205 }; 206 207 static struct kset *gfs2_kset; 208 209 /* 210 * display struct lm_lockstruct fields 211 */ 212 213 struct lockstruct_attr { 214 struct attribute attr; 215 ssize_t (*show)(struct gfs2_sbd *, char *); 216 }; 217 218 #define LOCKSTRUCT_ATTR(name, fmt) \ 219 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 220 { \ 221 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \ 222 } \ 223 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name) 224 225 LOCKSTRUCT_ATTR(jid, "%u\n"); 226 LOCKSTRUCT_ATTR(first, "%u\n"); 227 LOCKSTRUCT_ATTR(lvb_size, "%u\n"); 228 LOCKSTRUCT_ATTR(flags, "%d\n"); 229 230 static struct attribute *lockstruct_attrs[] = { 231 &lockstruct_attr_jid.attr, 232 &lockstruct_attr_first.attr, 233 &lockstruct_attr_lvb_size.attr, 234 &lockstruct_attr_flags.attr, 235 NULL, 236 }; 237 238 /* 239 * display struct gfs2_args fields 240 */ 241 242 struct args_attr { 243 struct attribute attr; 244 ssize_t (*show)(struct gfs2_sbd *, char *); 245 }; 246 247 #define ARGS_ATTR(name, fmt) \ 248 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 249 { \ 250 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \ 251 } \ 252 static struct args_attr args_attr_##name = __ATTR_RO(name) 253 254 ARGS_ATTR(lockproto, "%s\n"); 255 ARGS_ATTR(locktable, "%s\n"); 256 ARGS_ATTR(hostdata, "%s\n"); 257 ARGS_ATTR(spectator, "%d\n"); 258 ARGS_ATTR(ignore_local_fs, "%d\n"); 259 ARGS_ATTR(localcaching, "%d\n"); 260 ARGS_ATTR(localflocks, "%d\n"); 261 ARGS_ATTR(debug, "%d\n"); 262 ARGS_ATTR(upgrade, "%d\n"); 263 ARGS_ATTR(posix_acl, "%d\n"); 264 ARGS_ATTR(quota, "%u\n"); 265 ARGS_ATTR(suiddir, "%d\n"); 266 ARGS_ATTR(data, "%d\n"); 267 268 static struct attribute *args_attrs[] = { 269 &args_attr_lockproto.attr, 270 &args_attr_locktable.attr, 271 &args_attr_hostdata.attr, 272 &args_attr_spectator.attr, 273 &args_attr_ignore_local_fs.attr, 274 &args_attr_localcaching.attr, 275 &args_attr_localflocks.attr, 276 &args_attr_debug.attr, 277 &args_attr_upgrade.attr, 278 &args_attr_posix_acl.attr, 279 &args_attr_quota.attr, 280 &args_attr_suiddir.attr, 281 &args_attr_data.attr, 282 NULL, 283 }; 284 285 /* 286 * get and set struct gfs2_tune fields 287 */ 288 289 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 290 { 291 return snprintf(buf, PAGE_SIZE, "%u %u\n", 292 sdp->sd_tune.gt_quota_scale_num, 293 sdp->sd_tune.gt_quota_scale_den); 294 } 295 296 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 297 size_t len) 298 { 299 struct gfs2_tune *gt = &sdp->sd_tune; 300 unsigned int x, y; 301 302 if (!capable(CAP_SYS_ADMIN)) 303 return -EACCES; 304 305 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 306 return -EINVAL; 307 308 spin_lock(>->gt_spin); 309 gt->gt_quota_scale_num = x; 310 gt->gt_quota_scale_den = y; 311 spin_unlock(>->gt_spin); 312 return len; 313 } 314 315 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 316 int check_zero, const char *buf, size_t len) 317 { 318 struct gfs2_tune *gt = &sdp->sd_tune; 319 unsigned int x; 320 321 if (!capable(CAP_SYS_ADMIN)) 322 return -EACCES; 323 324 x = simple_strtoul(buf, NULL, 0); 325 326 if (check_zero && !x) 327 return -EINVAL; 328 329 spin_lock(>->gt_spin); 330 *field = x; 331 spin_unlock(>->gt_spin); 332 return len; 333 } 334 335 struct tune_attr { 336 struct attribute attr; 337 ssize_t (*show)(struct gfs2_sbd *, char *); 338 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 339 }; 340 341 #define TUNE_ATTR_3(name, show, store) \ 342 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store) 343 344 #define TUNE_ATTR_2(name, store) \ 345 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 346 { \ 347 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 348 } \ 349 TUNE_ATTR_3(name, name##_show, store) 350 351 #define TUNE_ATTR(name, check_zero) \ 352 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 353 { \ 354 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 355 } \ 356 TUNE_ATTR_2(name, name##_store) 357 358 #define TUNE_ATTR_DAEMON(name, process) \ 359 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 360 { \ 361 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \ 362 wake_up_process(sdp->sd_##process); \ 363 return r; \ 364 } \ 365 TUNE_ATTR_2(name, name##_store) 366 367 TUNE_ATTR(incore_log_blocks, 0); 368 TUNE_ATTR(log_flush_secs, 0); 369 TUNE_ATTR(quota_warn_period, 0); 370 TUNE_ATTR(quota_quantum, 0); 371 TUNE_ATTR(max_readahead, 0); 372 TUNE_ATTR(complain_secs, 0); 373 TUNE_ATTR(statfs_slow, 0); 374 TUNE_ATTR(new_files_jdata, 0); 375 TUNE_ATTR(quota_simul_sync, 1); 376 TUNE_ATTR(quota_cache_secs, 1); 377 TUNE_ATTR(stall_secs, 1); 378 TUNE_ATTR(statfs_quantum, 1); 379 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process); 380 TUNE_ATTR_DAEMON(logd_secs, logd_process); 381 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 382 383 static struct attribute *tune_attrs[] = { 384 &tune_attr_incore_log_blocks.attr, 385 &tune_attr_log_flush_secs.attr, 386 &tune_attr_quota_warn_period.attr, 387 &tune_attr_quota_quantum.attr, 388 &tune_attr_max_readahead.attr, 389 &tune_attr_complain_secs.attr, 390 &tune_attr_statfs_slow.attr, 391 &tune_attr_quota_simul_sync.attr, 392 &tune_attr_quota_cache_secs.attr, 393 &tune_attr_stall_secs.attr, 394 &tune_attr_statfs_quantum.attr, 395 &tune_attr_recoverd_secs.attr, 396 &tune_attr_logd_secs.attr, 397 &tune_attr_quota_scale.attr, 398 &tune_attr_new_files_jdata.attr, 399 NULL, 400 }; 401 402 static struct attribute_group lockstruct_group = { 403 .name = "lockstruct", 404 .attrs = lockstruct_attrs, 405 }; 406 407 static struct attribute_group args_group = { 408 .name = "args", 409 .attrs = args_attrs, 410 }; 411 412 static struct attribute_group tune_group = { 413 .name = "tune", 414 .attrs = tune_attrs, 415 }; 416 417 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 418 { 419 int error; 420 421 sdp->sd_kobj.kset = gfs2_kset; 422 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 423 "%s", sdp->sd_table_name); 424 if (error) 425 goto fail; 426 427 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group); 428 if (error) 429 goto fail_reg; 430 431 error = sysfs_create_group(&sdp->sd_kobj, &args_group); 432 if (error) 433 goto fail_lockstruct; 434 435 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 436 if (error) 437 goto fail_args; 438 439 kobject_uevent(&sdp->sd_kobj, KOBJ_ADD); 440 return 0; 441 442 fail_args: 443 sysfs_remove_group(&sdp->sd_kobj, &args_group); 444 fail_lockstruct: 445 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 446 fail_reg: 447 kobject_put(&sdp->sd_kobj); 448 fail: 449 fs_err(sdp, "error %d adding sysfs files", error); 450 return error; 451 } 452 453 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 454 { 455 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 456 sysfs_remove_group(&sdp->sd_kobj, &args_group); 457 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 458 kobject_put(&sdp->sd_kobj); 459 } 460 461 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 462 struct kobj_uevent_env *env) 463 { 464 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 465 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 466 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 467 return 0; 468 } 469 470 static struct kset_uevent_ops gfs2_uevent_ops = { 471 .uevent = gfs2_uevent, 472 }; 473 474 475 int gfs2_sys_init(void) 476 { 477 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 478 if (!gfs2_kset) 479 return -ENOMEM; 480 return 0; 481 } 482 483 void gfs2_sys_uninit(void) 484 { 485 kset_unregister(gfs2_kset); 486 } 487 488