Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * dlmglue.c |
| 5 | * |
| 6 | * Code which implements an OCFS2 specific interface to our DLM. |
| 7 | * |
| 8 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public |
| 21 | * License along with this program; if not, write to the |
| 22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | * Boston, MA 021110-1307, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/highmem.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/smp_lock.h> |
| 31 | #include <linux/crc32.h> |
| 32 | #include <linux/kthread.h> |
| 33 | #include <linux/pagemap.h> |
| 34 | #include <linux/debugfs.h> |
| 35 | #include <linux/seq_file.h> |
| 36 | |
| 37 | #include <cluster/heartbeat.h> |
| 38 | #include <cluster/nodemanager.h> |
| 39 | #include <cluster/tcp.h> |
| 40 | |
| 41 | #include <dlm/dlmapi.h> |
| 42 | |
| 43 | #define MLOG_MASK_PREFIX ML_DLM_GLUE |
| 44 | #include <cluster/masklog.h> |
| 45 | |
| 46 | #include "ocfs2.h" |
| 47 | |
| 48 | #include "alloc.h" |
| 49 | #include "dlmglue.h" |
| 50 | #include "extent_map.h" |
| 51 | #include "heartbeat.h" |
| 52 | #include "inode.h" |
| 53 | #include "journal.h" |
| 54 | #include "slot_map.h" |
| 55 | #include "super.h" |
| 56 | #include "uptodate.h" |
| 57 | #include "vote.h" |
| 58 | |
| 59 | #include "buffer_head_io.h" |
| 60 | |
| 61 | struct ocfs2_mask_waiter { |
| 62 | struct list_head mw_item; |
| 63 | int mw_status; |
| 64 | struct completion mw_complete; |
| 65 | unsigned long mw_mask; |
| 66 | unsigned long mw_goal; |
| 67 | }; |
| 68 | |
| 69 | static void ocfs2_inode_ast_func(void *opaque); |
| 70 | static void ocfs2_inode_bast_func(void *opaque, |
| 71 | int level); |
| 72 | static void ocfs2_super_ast_func(void *opaque); |
| 73 | static void ocfs2_super_bast_func(void *opaque, |
| 74 | int level); |
| 75 | static void ocfs2_rename_ast_func(void *opaque); |
| 76 | static void ocfs2_rename_bast_func(void *opaque, |
| 77 | int level); |
| 78 | |
| 79 | /* so far, all locks have gotten along with the same unlock ast */ |
| 80 | static void ocfs2_unlock_ast_func(void *opaque, |
| 81 | enum dlm_status status); |
| 82 | static int ocfs2_do_unblock_meta(struct inode *inode, |
| 83 | int *requeue); |
| 84 | static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, |
| 85 | int *requeue); |
| 86 | static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, |
| 87 | int *requeue); |
| 88 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, |
| 89 | int *requeue); |
| 90 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, |
| 91 | int *requeue); |
| 92 | typedef void (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int); |
| 93 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, |
| 94 | struct ocfs2_lock_res *lockres, |
| 95 | int *requeue, |
| 96 | ocfs2_convert_worker_t *worker); |
| 97 | |
| 98 | struct ocfs2_lock_res_ops { |
| 99 | void (*ast)(void *); |
| 100 | void (*bast)(void *, int); |
| 101 | void (*unlock_ast)(void *, enum dlm_status); |
| 102 | int (*unblock)(struct ocfs2_lock_res *, int *); |
| 103 | }; |
| 104 | |
| 105 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
| 106 | .ast = ocfs2_inode_ast_func, |
| 107 | .bast = ocfs2_inode_bast_func, |
| 108 | .unlock_ast = ocfs2_unlock_ast_func, |
| 109 | .unblock = ocfs2_unblock_inode_lock, |
| 110 | }; |
| 111 | |
| 112 | static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { |
| 113 | .ast = ocfs2_inode_ast_func, |
| 114 | .bast = ocfs2_inode_bast_func, |
| 115 | .unlock_ast = ocfs2_unlock_ast_func, |
| 116 | .unblock = ocfs2_unblock_meta, |
| 117 | }; |
| 118 | |
| 119 | static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
| 120 | int blocking); |
| 121 | |
| 122 | static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { |
| 123 | .ast = ocfs2_inode_ast_func, |
| 124 | .bast = ocfs2_inode_bast_func, |
| 125 | .unlock_ast = ocfs2_unlock_ast_func, |
| 126 | .unblock = ocfs2_unblock_data, |
| 127 | }; |
| 128 | |
| 129 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
| 130 | .ast = ocfs2_super_ast_func, |
| 131 | .bast = ocfs2_super_bast_func, |
| 132 | .unlock_ast = ocfs2_unlock_ast_func, |
| 133 | .unblock = ocfs2_unblock_osb_lock, |
| 134 | }; |
| 135 | |
| 136 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { |
| 137 | .ast = ocfs2_rename_ast_func, |
| 138 | .bast = ocfs2_rename_bast_func, |
| 139 | .unlock_ast = ocfs2_unlock_ast_func, |
| 140 | .unblock = ocfs2_unblock_osb_lock, |
| 141 | }; |
| 142 | |
| 143 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
| 144 | { |
| 145 | return lockres->l_type == OCFS2_LOCK_TYPE_META || |
| 146 | lockres->l_type == OCFS2_LOCK_TYPE_DATA || |
| 147 | lockres->l_type == OCFS2_LOCK_TYPE_RW; |
| 148 | } |
| 149 | |
| 150 | static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres) |
| 151 | { |
| 152 | return lockres->l_type == OCFS2_LOCK_TYPE_SUPER; |
| 153 | } |
| 154 | |
| 155 | static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres) |
| 156 | { |
| 157 | return lockres->l_type == OCFS2_LOCK_TYPE_RENAME; |
| 158 | } |
| 159 | |
| 160 | static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres) |
| 161 | { |
| 162 | BUG_ON(!ocfs2_is_super_lock(lockres) |
| 163 | && !ocfs2_is_rename_lock(lockres)); |
| 164 | |
| 165 | return (struct ocfs2_super *) lockres->l_priv; |
| 166 | } |
| 167 | |
| 168 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
| 169 | { |
| 170 | BUG_ON(!ocfs2_is_inode_lock(lockres)); |
| 171 | |
| 172 | return (struct inode *) lockres->l_priv; |
| 173 | } |
| 174 | |
| 175 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
| 176 | struct ocfs2_lock_res *lockres, |
| 177 | int level, |
| 178 | int dlm_flags); |
| 179 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
| 180 | int wanted); |
| 181 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, |
| 182 | struct ocfs2_lock_res *lockres, |
| 183 | int level); |
| 184 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); |
| 185 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); |
| 186 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); |
| 187 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); |
| 188 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, |
| 189 | struct ocfs2_lock_res *lockres); |
| 190 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
| 191 | int convert); |
| 192 | #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ |
| 193 | mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ |
| 194 | "resource %s: %s\n", dlm_errname(_stat), _func, \ |
| 195 | _lockres->l_name, dlm_errmsg(_stat)); \ |
| 196 | } while (0) |
| 197 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, |
| 198 | struct ocfs2_lock_res *lockres); |
| 199 | static int ocfs2_meta_lock_update(struct inode *inode, |
| 200 | struct buffer_head **bh); |
| 201 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); |
| 202 | static inline int ocfs2_highest_compat_lock_level(int level); |
| 203 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, |
| 204 | struct ocfs2_lock_res *lockres, |
| 205 | int new_level); |
| 206 | |
| 207 | static char *ocfs2_lock_type_strings[] = { |
| 208 | [OCFS2_LOCK_TYPE_META] = "Meta", |
| 209 | [OCFS2_LOCK_TYPE_DATA] = "Data", |
| 210 | [OCFS2_LOCK_TYPE_SUPER] = "Super", |
| 211 | [OCFS2_LOCK_TYPE_RENAME] = "Rename", |
| 212 | /* Need to differntiate from [R]ename.. serializing writes is the |
| 213 | * important job it does, anyway. */ |
| 214 | [OCFS2_LOCK_TYPE_RW] = "Write/Read", |
| 215 | }; |
| 216 | |
| 217 | static char *ocfs2_lock_type_string(enum ocfs2_lock_type type) |
| 218 | { |
| 219 | mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type); |
| 220 | return ocfs2_lock_type_strings[type]; |
| 221 | } |
| 222 | |
| 223 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
| 224 | u64 blkno, |
| 225 | u32 generation, |
| 226 | char *name) |
| 227 | { |
| 228 | int len; |
| 229 | |
| 230 | mlog_entry_void(); |
| 231 | |
| 232 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); |
| 233 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 234 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
| 235 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, |
| 236 | (long long)blkno, generation); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 237 | |
| 238 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); |
| 239 | |
| 240 | mlog(0, "built lock resource with name: %s\n", name); |
| 241 | |
| 242 | mlog_exit_void(); |
| 243 | } |
| 244 | |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame^] | 245 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 246 | |
| 247 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, |
| 248 | struct ocfs2_dlm_debug *dlm_debug) |
| 249 | { |
| 250 | mlog(0, "Add tracking for lockres %s\n", res->l_name); |
| 251 | |
| 252 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 253 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); |
| 254 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 255 | } |
| 256 | |
| 257 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) |
| 258 | { |
| 259 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 260 | if (!list_empty(&res->l_debug_list)) |
| 261 | list_del_init(&res->l_debug_list); |
| 262 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 263 | } |
| 264 | |
| 265 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
| 266 | struct ocfs2_lock_res *res, |
| 267 | enum ocfs2_lock_type type, |
| 268 | u64 blkno, |
| 269 | u32 generation, |
| 270 | struct ocfs2_lock_res_ops *ops, |
| 271 | void *priv) |
| 272 | { |
| 273 | ocfs2_build_lock_name(type, blkno, generation, res->l_name); |
| 274 | |
| 275 | res->l_type = type; |
| 276 | res->l_ops = ops; |
| 277 | res->l_priv = priv; |
| 278 | |
| 279 | res->l_level = LKM_IVMODE; |
| 280 | res->l_requested = LKM_IVMODE; |
| 281 | res->l_blocking = LKM_IVMODE; |
| 282 | res->l_action = OCFS2_AST_INVALID; |
| 283 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; |
| 284 | |
| 285 | res->l_flags = OCFS2_LOCK_INITIALIZED; |
| 286 | |
| 287 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); |
| 288 | } |
| 289 | |
| 290 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) |
| 291 | { |
| 292 | /* This also clears out the lock status block */ |
| 293 | memset(res, 0, sizeof(struct ocfs2_lock_res)); |
| 294 | spin_lock_init(&res->l_lock); |
| 295 | init_waitqueue_head(&res->l_event); |
| 296 | INIT_LIST_HEAD(&res->l_blocked_list); |
| 297 | INIT_LIST_HEAD(&res->l_mask_waiters); |
| 298 | } |
| 299 | |
| 300 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, |
| 301 | enum ocfs2_lock_type type, |
| 302 | struct inode *inode) |
| 303 | { |
| 304 | struct ocfs2_lock_res_ops *ops; |
| 305 | |
| 306 | switch(type) { |
| 307 | case OCFS2_LOCK_TYPE_RW: |
| 308 | ops = &ocfs2_inode_rw_lops; |
| 309 | break; |
| 310 | case OCFS2_LOCK_TYPE_META: |
| 311 | ops = &ocfs2_inode_meta_lops; |
| 312 | break; |
| 313 | case OCFS2_LOCK_TYPE_DATA: |
| 314 | ops = &ocfs2_inode_data_lops; |
| 315 | break; |
| 316 | default: |
| 317 | mlog_bug_on_msg(1, "type: %d\n", type); |
| 318 | ops = NULL; /* thanks, gcc */ |
| 319 | break; |
| 320 | }; |
| 321 | |
| 322 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, |
| 323 | OCFS2_I(inode)->ip_blkno, |
| 324 | inode->i_generation, ops, inode); |
| 325 | } |
| 326 | |
| 327 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, |
| 328 | struct ocfs2_super *osb) |
| 329 | { |
| 330 | /* Superblock lockres doesn't come from a slab so we call init |
| 331 | * once on it manually. */ |
| 332 | ocfs2_lock_res_init_once(res); |
| 333 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
| 334 | OCFS2_SUPER_BLOCK_BLKNO, 0, |
| 335 | &ocfs2_super_lops, osb); |
| 336 | } |
| 337 | |
| 338 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, |
| 339 | struct ocfs2_super *osb) |
| 340 | { |
| 341 | /* Rename lockres doesn't come from a slab so we call init |
| 342 | * once on it manually. */ |
| 343 | ocfs2_lock_res_init_once(res); |
| 344 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 0, 0, |
| 345 | &ocfs2_rename_lops, osb); |
| 346 | } |
| 347 | |
| 348 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
| 349 | { |
| 350 | mlog_entry_void(); |
| 351 | |
| 352 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
| 353 | return; |
| 354 | |
| 355 | ocfs2_remove_lockres_tracking(res); |
| 356 | |
| 357 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), |
| 358 | "Lockres %s is on the blocked list\n", |
| 359 | res->l_name); |
| 360 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), |
| 361 | "Lockres %s has mask waiters pending\n", |
| 362 | res->l_name); |
| 363 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), |
| 364 | "Lockres %s is locked\n", |
| 365 | res->l_name); |
| 366 | mlog_bug_on_msg(res->l_ro_holders, |
| 367 | "Lockres %s has %u ro holders\n", |
| 368 | res->l_name, res->l_ro_holders); |
| 369 | mlog_bug_on_msg(res->l_ex_holders, |
| 370 | "Lockres %s has %u ex holders\n", |
| 371 | res->l_name, res->l_ex_holders); |
| 372 | |
| 373 | /* Need to clear out the lock status block for the dlm */ |
| 374 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); |
| 375 | |
| 376 | res->l_flags = 0UL; |
| 377 | mlog_exit_void(); |
| 378 | } |
| 379 | |
| 380 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, |
| 381 | int level) |
| 382 | { |
| 383 | mlog_entry_void(); |
| 384 | |
| 385 | BUG_ON(!lockres); |
| 386 | |
| 387 | switch(level) { |
| 388 | case LKM_EXMODE: |
| 389 | lockres->l_ex_holders++; |
| 390 | break; |
| 391 | case LKM_PRMODE: |
| 392 | lockres->l_ro_holders++; |
| 393 | break; |
| 394 | default: |
| 395 | BUG(); |
| 396 | } |
| 397 | |
| 398 | mlog_exit_void(); |
| 399 | } |
| 400 | |
| 401 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, |
| 402 | int level) |
| 403 | { |
| 404 | mlog_entry_void(); |
| 405 | |
| 406 | BUG_ON(!lockres); |
| 407 | |
| 408 | switch(level) { |
| 409 | case LKM_EXMODE: |
| 410 | BUG_ON(!lockres->l_ex_holders); |
| 411 | lockres->l_ex_holders--; |
| 412 | break; |
| 413 | case LKM_PRMODE: |
| 414 | BUG_ON(!lockres->l_ro_holders); |
| 415 | lockres->l_ro_holders--; |
| 416 | break; |
| 417 | default: |
| 418 | BUG(); |
| 419 | } |
| 420 | mlog_exit_void(); |
| 421 | } |
| 422 | |
| 423 | /* WARNING: This function lives in a world where the only three lock |
| 424 | * levels are EX, PR, and NL. It *will* have to be adjusted when more |
| 425 | * lock types are added. */ |
| 426 | static inline int ocfs2_highest_compat_lock_level(int level) |
| 427 | { |
| 428 | int new_level = LKM_EXMODE; |
| 429 | |
| 430 | if (level == LKM_EXMODE) |
| 431 | new_level = LKM_NLMODE; |
| 432 | else if (level == LKM_PRMODE) |
| 433 | new_level = LKM_PRMODE; |
| 434 | return new_level; |
| 435 | } |
| 436 | |
| 437 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, |
| 438 | unsigned long newflags) |
| 439 | { |
| 440 | struct list_head *pos, *tmp; |
| 441 | struct ocfs2_mask_waiter *mw; |
| 442 | |
| 443 | assert_spin_locked(&lockres->l_lock); |
| 444 | |
| 445 | lockres->l_flags = newflags; |
| 446 | |
| 447 | list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { |
| 448 | mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); |
| 449 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
| 450 | continue; |
| 451 | |
| 452 | list_del_init(&mw->mw_item); |
| 453 | mw->mw_status = 0; |
| 454 | complete(&mw->mw_complete); |
| 455 | } |
| 456 | } |
| 457 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) |
| 458 | { |
| 459 | lockres_set_flags(lockres, lockres->l_flags | or); |
| 460 | } |
| 461 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, |
| 462 | unsigned long clear) |
| 463 | { |
| 464 | lockres_set_flags(lockres, lockres->l_flags & ~clear); |
| 465 | } |
| 466 | |
| 467 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) |
| 468 | { |
| 469 | mlog_entry_void(); |
| 470 | |
| 471 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
| 472 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); |
| 473 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 474 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); |
| 475 | |
| 476 | lockres->l_level = lockres->l_requested; |
| 477 | if (lockres->l_level <= |
| 478 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { |
| 479 | lockres->l_blocking = LKM_NLMODE; |
| 480 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
| 481 | } |
| 482 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 483 | |
| 484 | mlog_exit_void(); |
| 485 | } |
| 486 | |
| 487 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) |
| 488 | { |
| 489 | mlog_entry_void(); |
| 490 | |
| 491 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
| 492 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); |
| 493 | |
| 494 | /* Convert from RO to EX doesn't really need anything as our |
| 495 | * information is already up to data. Convert from NL to |
| 496 | * *anything* however should mark ourselves as needing an |
| 497 | * update */ |
| 498 | if (lockres->l_level == LKM_NLMODE) |
| 499 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 500 | |
| 501 | lockres->l_level = lockres->l_requested; |
| 502 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 503 | |
| 504 | mlog_exit_void(); |
| 505 | } |
| 506 | |
| 507 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) |
| 508 | { |
| 509 | mlog_entry_void(); |
| 510 | |
| 511 | BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); |
| 512 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
| 513 | |
| 514 | if (lockres->l_requested > LKM_NLMODE && |
| 515 | !(lockres->l_flags & OCFS2_LOCK_LOCAL)) |
| 516 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 517 | |
| 518 | lockres->l_level = lockres->l_requested; |
| 519 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); |
| 520 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 521 | |
| 522 | mlog_exit_void(); |
| 523 | } |
| 524 | |
| 525 | static void ocfs2_inode_ast_func(void *opaque) |
| 526 | { |
| 527 | struct ocfs2_lock_res *lockres = opaque; |
| 528 | struct inode *inode; |
| 529 | struct dlm_lockstatus *lksb; |
| 530 | unsigned long flags; |
| 531 | |
| 532 | mlog_entry_void(); |
| 533 | |
| 534 | inode = ocfs2_lock_res_inode(lockres); |
| 535 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 536 | mlog(0, "AST fired for inode %llu, l_action = %u, type = %s\n", |
| 537 | (unsigned long long)OCFS2_I(inode)->ip_blkno, lockres->l_action, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 538 | ocfs2_lock_type_string(lockres->l_type)); |
| 539 | |
| 540 | BUG_ON(!ocfs2_is_inode_lock(lockres)); |
| 541 | |
| 542 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 543 | |
| 544 | lksb = &(lockres->l_lksb); |
| 545 | if (lksb->status != DLM_NORMAL) { |
| 546 | mlog(ML_ERROR, "ocfs2_inode_ast_func: lksb status value of %u " |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 547 | "on inode %llu\n", lksb->status, |
| 548 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 549 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 550 | mlog_exit_void(); |
| 551 | return; |
| 552 | } |
| 553 | |
| 554 | switch(lockres->l_action) { |
| 555 | case OCFS2_AST_ATTACH: |
| 556 | ocfs2_generic_handle_attach_action(lockres); |
| 557 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
| 558 | break; |
| 559 | case OCFS2_AST_CONVERT: |
| 560 | ocfs2_generic_handle_convert_action(lockres); |
| 561 | break; |
| 562 | case OCFS2_AST_DOWNCONVERT: |
| 563 | ocfs2_generic_handle_downconvert_action(lockres); |
| 564 | break; |
| 565 | default: |
| 566 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " |
| 567 | "lockres flags = 0x%lx, unlock action: %u\n", |
| 568 | lockres->l_name, lockres->l_action, lockres->l_flags, |
| 569 | lockres->l_unlock_action); |
| 570 | |
| 571 | BUG(); |
| 572 | } |
| 573 | |
| 574 | /* data and rw locking ignores refresh flag for now. */ |
| 575 | if (lockres->l_type != OCFS2_LOCK_TYPE_META) |
| 576 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 577 | |
| 578 | /* set it to something invalid so if we get called again we |
| 579 | * can catch it. */ |
| 580 | lockres->l_action = OCFS2_AST_INVALID; |
| 581 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 582 | wake_up(&lockres->l_event); |
| 583 | |
| 584 | mlog_exit_void(); |
| 585 | } |
| 586 | |
| 587 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
| 588 | int level) |
| 589 | { |
| 590 | int needs_downconvert = 0; |
| 591 | mlog_entry_void(); |
| 592 | |
| 593 | assert_spin_locked(&lockres->l_lock); |
| 594 | |
| 595 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); |
| 596 | |
| 597 | if (level > lockres->l_blocking) { |
| 598 | /* only schedule a downconvert if we haven't already scheduled |
| 599 | * one that goes low enough to satisfy the level we're |
| 600 | * blocking. this also catches the case where we get |
| 601 | * duplicate BASTs */ |
| 602 | if (ocfs2_highest_compat_lock_level(level) < |
| 603 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) |
| 604 | needs_downconvert = 1; |
| 605 | |
| 606 | lockres->l_blocking = level; |
| 607 | } |
| 608 | |
| 609 | mlog_exit(needs_downconvert); |
| 610 | return needs_downconvert; |
| 611 | } |
| 612 | |
| 613 | static void ocfs2_generic_bast_func(struct ocfs2_super *osb, |
| 614 | struct ocfs2_lock_res *lockres, |
| 615 | int level) |
| 616 | { |
| 617 | int needs_downconvert; |
| 618 | unsigned long flags; |
| 619 | |
| 620 | mlog_entry_void(); |
| 621 | |
| 622 | BUG_ON(level <= LKM_NLMODE); |
| 623 | |
| 624 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 625 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); |
| 626 | if (needs_downconvert) |
| 627 | ocfs2_schedule_blocked_lock(osb, lockres); |
| 628 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 629 | |
| 630 | ocfs2_kick_vote_thread(osb); |
| 631 | |
| 632 | wake_up(&lockres->l_event); |
| 633 | mlog_exit_void(); |
| 634 | } |
| 635 | |
| 636 | static void ocfs2_inode_bast_func(void *opaque, int level) |
| 637 | { |
| 638 | struct ocfs2_lock_res *lockres = opaque; |
| 639 | struct inode *inode; |
| 640 | struct ocfs2_super *osb; |
| 641 | |
| 642 | mlog_entry_void(); |
| 643 | |
| 644 | BUG_ON(!ocfs2_is_inode_lock(lockres)); |
| 645 | |
| 646 | inode = ocfs2_lock_res_inode(lockres); |
| 647 | osb = OCFS2_SB(inode->i_sb); |
| 648 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 649 | mlog(0, "BAST fired for inode %llu, blocking %d, level %d type %s\n", |
| 650 | (unsigned long long)OCFS2_I(inode)->ip_blkno, level, |
| 651 | lockres->l_level, ocfs2_lock_type_string(lockres->l_type)); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 652 | |
| 653 | ocfs2_generic_bast_func(osb, lockres, level); |
| 654 | |
| 655 | mlog_exit_void(); |
| 656 | } |
| 657 | |
| 658 | static void ocfs2_generic_ast_func(struct ocfs2_lock_res *lockres, |
| 659 | int ignore_refresh) |
| 660 | { |
| 661 | struct dlm_lockstatus *lksb = &lockres->l_lksb; |
| 662 | unsigned long flags; |
| 663 | |
| 664 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 665 | |
| 666 | if (lksb->status != DLM_NORMAL) { |
| 667 | mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", |
| 668 | lockres->l_name, lksb->status); |
| 669 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 670 | return; |
| 671 | } |
| 672 | |
| 673 | switch(lockres->l_action) { |
| 674 | case OCFS2_AST_ATTACH: |
| 675 | ocfs2_generic_handle_attach_action(lockres); |
| 676 | break; |
| 677 | case OCFS2_AST_CONVERT: |
| 678 | ocfs2_generic_handle_convert_action(lockres); |
| 679 | break; |
| 680 | case OCFS2_AST_DOWNCONVERT: |
| 681 | ocfs2_generic_handle_downconvert_action(lockres); |
| 682 | break; |
| 683 | default: |
| 684 | BUG(); |
| 685 | } |
| 686 | |
| 687 | if (ignore_refresh) |
| 688 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 689 | |
| 690 | /* set it to something invalid so if we get called again we |
| 691 | * can catch it. */ |
| 692 | lockres->l_action = OCFS2_AST_INVALID; |
| 693 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 694 | |
| 695 | wake_up(&lockres->l_event); |
| 696 | } |
| 697 | |
| 698 | static void ocfs2_super_ast_func(void *opaque) |
| 699 | { |
| 700 | struct ocfs2_lock_res *lockres = opaque; |
| 701 | |
| 702 | mlog_entry_void(); |
| 703 | mlog(0, "Superblock AST fired\n"); |
| 704 | |
| 705 | BUG_ON(!ocfs2_is_super_lock(lockres)); |
| 706 | ocfs2_generic_ast_func(lockres, 0); |
| 707 | |
| 708 | mlog_exit_void(); |
| 709 | } |
| 710 | |
| 711 | static void ocfs2_super_bast_func(void *opaque, |
| 712 | int level) |
| 713 | { |
| 714 | struct ocfs2_lock_res *lockres = opaque; |
| 715 | struct ocfs2_super *osb; |
| 716 | |
| 717 | mlog_entry_void(); |
| 718 | mlog(0, "Superblock BAST fired\n"); |
| 719 | |
| 720 | BUG_ON(!ocfs2_is_super_lock(lockres)); |
| 721 | osb = ocfs2_lock_res_super(lockres); |
| 722 | ocfs2_generic_bast_func(osb, lockres, level); |
| 723 | |
| 724 | mlog_exit_void(); |
| 725 | } |
| 726 | |
| 727 | static void ocfs2_rename_ast_func(void *opaque) |
| 728 | { |
| 729 | struct ocfs2_lock_res *lockres = opaque; |
| 730 | |
| 731 | mlog_entry_void(); |
| 732 | |
| 733 | mlog(0, "Rename AST fired\n"); |
| 734 | |
| 735 | BUG_ON(!ocfs2_is_rename_lock(lockres)); |
| 736 | |
| 737 | ocfs2_generic_ast_func(lockres, 1); |
| 738 | |
| 739 | mlog_exit_void(); |
| 740 | } |
| 741 | |
| 742 | static void ocfs2_rename_bast_func(void *opaque, |
| 743 | int level) |
| 744 | { |
| 745 | struct ocfs2_lock_res *lockres = opaque; |
| 746 | struct ocfs2_super *osb; |
| 747 | |
| 748 | mlog_entry_void(); |
| 749 | |
| 750 | mlog(0, "Rename BAST fired\n"); |
| 751 | |
| 752 | BUG_ON(!ocfs2_is_rename_lock(lockres)); |
| 753 | |
| 754 | osb = ocfs2_lock_res_super(lockres); |
| 755 | ocfs2_generic_bast_func(osb, lockres, level); |
| 756 | |
| 757 | mlog_exit_void(); |
| 758 | } |
| 759 | |
| 760 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
| 761 | int convert) |
| 762 | { |
| 763 | unsigned long flags; |
| 764 | |
| 765 | mlog_entry_void(); |
| 766 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 767 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 768 | if (convert) |
| 769 | lockres->l_action = OCFS2_AST_INVALID; |
| 770 | else |
| 771 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
| 772 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 773 | |
| 774 | wake_up(&lockres->l_event); |
| 775 | mlog_exit_void(); |
| 776 | } |
| 777 | |
| 778 | /* Note: If we detect another process working on the lock (i.e., |
| 779 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller |
| 780 | * to do the right thing in that case. |
| 781 | */ |
| 782 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
| 783 | struct ocfs2_lock_res *lockres, |
| 784 | int level, |
| 785 | int dlm_flags) |
| 786 | { |
| 787 | int ret = 0; |
| 788 | enum dlm_status status; |
| 789 | unsigned long flags; |
| 790 | |
| 791 | mlog_entry_void(); |
| 792 | |
| 793 | mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, |
| 794 | dlm_flags); |
| 795 | |
| 796 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 797 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || |
| 798 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { |
| 799 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 800 | goto bail; |
| 801 | } |
| 802 | |
| 803 | lockres->l_action = OCFS2_AST_ATTACH; |
| 804 | lockres->l_requested = level; |
| 805 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 806 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 807 | |
| 808 | status = dlmlock(osb->dlm, |
| 809 | level, |
| 810 | &lockres->l_lksb, |
| 811 | dlm_flags, |
| 812 | lockres->l_name, |
| 813 | lockres->l_ops->ast, |
| 814 | lockres, |
| 815 | lockres->l_ops->bast); |
| 816 | if (status != DLM_NORMAL) { |
| 817 | ocfs2_log_dlm_error("dlmlock", status, lockres); |
| 818 | ret = -EINVAL; |
| 819 | ocfs2_recover_from_dlm_error(lockres, 1); |
| 820 | } |
| 821 | |
| 822 | mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); |
| 823 | |
| 824 | bail: |
| 825 | mlog_exit(ret); |
| 826 | return ret; |
| 827 | } |
| 828 | |
| 829 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, |
| 830 | int flag) |
| 831 | { |
| 832 | unsigned long flags; |
| 833 | int ret; |
| 834 | |
| 835 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 836 | ret = lockres->l_flags & flag; |
| 837 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 838 | |
| 839 | return ret; |
| 840 | } |
| 841 | |
| 842 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) |
| 843 | |
| 844 | { |
| 845 | wait_event(lockres->l_event, |
| 846 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); |
| 847 | } |
| 848 | |
| 849 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) |
| 850 | |
| 851 | { |
| 852 | wait_event(lockres->l_event, |
| 853 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); |
| 854 | } |
| 855 | |
| 856 | /* predict what lock level we'll be dropping down to on behalf |
| 857 | * of another node, and return true if the currently wanted |
| 858 | * level will be compatible with it. */ |
| 859 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
| 860 | int wanted) |
| 861 | { |
| 862 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 863 | |
| 864 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); |
| 865 | } |
| 866 | |
| 867 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) |
| 868 | { |
| 869 | INIT_LIST_HEAD(&mw->mw_item); |
| 870 | init_completion(&mw->mw_complete); |
| 871 | } |
| 872 | |
| 873 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) |
| 874 | { |
| 875 | wait_for_completion(&mw->mw_complete); |
| 876 | /* Re-arm the completion in case we want to wait on it again */ |
| 877 | INIT_COMPLETION(mw->mw_complete); |
| 878 | return mw->mw_status; |
| 879 | } |
| 880 | |
| 881 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, |
| 882 | struct ocfs2_mask_waiter *mw, |
| 883 | unsigned long mask, |
| 884 | unsigned long goal) |
| 885 | { |
| 886 | BUG_ON(!list_empty(&mw->mw_item)); |
| 887 | |
| 888 | assert_spin_locked(&lockres->l_lock); |
| 889 | |
| 890 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); |
| 891 | mw->mw_mask = mask; |
| 892 | mw->mw_goal = goal; |
| 893 | } |
| 894 | |
| 895 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY |
| 896 | * if the mask still hadn't reached its goal */ |
| 897 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
| 898 | struct ocfs2_mask_waiter *mw) |
| 899 | { |
| 900 | unsigned long flags; |
| 901 | int ret = 0; |
| 902 | |
| 903 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 904 | if (!list_empty(&mw->mw_item)) { |
| 905 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
| 906 | ret = -EBUSY; |
| 907 | |
| 908 | list_del_init(&mw->mw_item); |
| 909 | init_completion(&mw->mw_complete); |
| 910 | } |
| 911 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 912 | |
| 913 | return ret; |
| 914 | |
| 915 | } |
| 916 | |
| 917 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, |
| 918 | struct ocfs2_lock_res *lockres, |
| 919 | int level, |
| 920 | int lkm_flags, |
| 921 | int arg_flags) |
| 922 | { |
| 923 | struct ocfs2_mask_waiter mw; |
| 924 | enum dlm_status status; |
| 925 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
| 926 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ |
| 927 | unsigned long flags; |
| 928 | |
| 929 | mlog_entry_void(); |
| 930 | |
| 931 | ocfs2_init_mask_waiter(&mw); |
| 932 | |
| 933 | again: |
| 934 | wait = 0; |
| 935 | |
| 936 | if (catch_signals && signal_pending(current)) { |
| 937 | ret = -ERESTARTSYS; |
| 938 | goto out; |
| 939 | } |
| 940 | |
| 941 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 942 | |
| 943 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
| 944 | "Cluster lock called on freeing lockres %s! flags " |
| 945 | "0x%lx\n", lockres->l_name, lockres->l_flags); |
| 946 | |
| 947 | /* We only compare against the currently granted level |
| 948 | * here. If the lock is blocked waiting on a downconvert, |
| 949 | * we'll get caught below. */ |
| 950 | if (lockres->l_flags & OCFS2_LOCK_BUSY && |
| 951 | level > lockres->l_level) { |
| 952 | /* is someone sitting in dlm_lock? If so, wait on |
| 953 | * them. */ |
| 954 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
| 955 | wait = 1; |
| 956 | goto unlock; |
| 957 | } |
| 958 | |
| 959 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
| 960 | /* lock has not been created yet. */ |
| 961 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 962 | |
| 963 | ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); |
| 964 | if (ret < 0) { |
| 965 | mlog_errno(ret); |
| 966 | goto out; |
| 967 | } |
| 968 | goto again; |
| 969 | } |
| 970 | |
| 971 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
| 972 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { |
| 973 | /* is the lock is currently blocked on behalf of |
| 974 | * another node */ |
| 975 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); |
| 976 | wait = 1; |
| 977 | goto unlock; |
| 978 | } |
| 979 | |
| 980 | if (level > lockres->l_level) { |
| 981 | if (lockres->l_action != OCFS2_AST_INVALID) |
| 982 | mlog(ML_ERROR, "lockres %s has action %u pending\n", |
| 983 | lockres->l_name, lockres->l_action); |
| 984 | |
| 985 | lockres->l_action = OCFS2_AST_CONVERT; |
| 986 | lockres->l_requested = level; |
| 987 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 988 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 989 | |
| 990 | BUG_ON(level == LKM_IVMODE); |
| 991 | BUG_ON(level == LKM_NLMODE); |
| 992 | |
| 993 | mlog(0, "lock %s, convert from %d to level = %d\n", |
| 994 | lockres->l_name, lockres->l_level, level); |
| 995 | |
| 996 | /* call dlm_lock to upgrade lock now */ |
| 997 | status = dlmlock(osb->dlm, |
| 998 | level, |
| 999 | &lockres->l_lksb, |
| 1000 | lkm_flags|LKM_CONVERT|LKM_VALBLK, |
| 1001 | lockres->l_name, |
| 1002 | lockres->l_ops->ast, |
| 1003 | lockres, |
| 1004 | lockres->l_ops->bast); |
| 1005 | if (status != DLM_NORMAL) { |
| 1006 | if ((lkm_flags & LKM_NOQUEUE) && |
| 1007 | (status == DLM_NOTQUEUED)) |
| 1008 | ret = -EAGAIN; |
| 1009 | else { |
| 1010 | ocfs2_log_dlm_error("dlmlock", status, |
| 1011 | lockres); |
| 1012 | ret = -EINVAL; |
| 1013 | } |
| 1014 | ocfs2_recover_from_dlm_error(lockres, 1); |
| 1015 | goto out; |
| 1016 | } |
| 1017 | |
| 1018 | mlog(0, "lock %s, successfull return from dlmlock\n", |
| 1019 | lockres->l_name); |
| 1020 | |
| 1021 | /* At this point we've gone inside the dlm and need to |
| 1022 | * complete our work regardless. */ |
| 1023 | catch_signals = 0; |
| 1024 | |
| 1025 | /* wait for busy to clear and carry on */ |
| 1026 | goto again; |
| 1027 | } |
| 1028 | |
| 1029 | /* Ok, if we get here then we're good to go. */ |
| 1030 | ocfs2_inc_holders(lockres, level); |
| 1031 | |
| 1032 | ret = 0; |
| 1033 | unlock: |
| 1034 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1035 | out: |
| 1036 | /* |
| 1037 | * This is helping work around a lock inversion between the page lock |
| 1038 | * and dlm locks. One path holds the page lock while calling aops |
| 1039 | * which block acquiring dlm locks. The voting thread holds dlm |
| 1040 | * locks while acquiring page locks while down converting data locks. |
| 1041 | * This block is helping an aop path notice the inversion and back |
| 1042 | * off to unlock its page lock before trying the dlm lock again. |
| 1043 | */ |
| 1044 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && |
| 1045 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { |
| 1046 | wait = 0; |
| 1047 | if (lockres_remove_mask_waiter(lockres, &mw)) |
| 1048 | ret = -EAGAIN; |
| 1049 | else |
| 1050 | goto again; |
| 1051 | } |
| 1052 | if (wait) { |
| 1053 | ret = ocfs2_wait_for_mask(&mw); |
| 1054 | if (ret == 0) |
| 1055 | goto again; |
| 1056 | mlog_errno(ret); |
| 1057 | } |
| 1058 | |
| 1059 | mlog_exit(ret); |
| 1060 | return ret; |
| 1061 | } |
| 1062 | |
| 1063 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, |
| 1064 | struct ocfs2_lock_res *lockres, |
| 1065 | int level) |
| 1066 | { |
| 1067 | unsigned long flags; |
| 1068 | |
| 1069 | mlog_entry_void(); |
| 1070 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1071 | ocfs2_dec_holders(lockres, level); |
| 1072 | ocfs2_vote_on_unlock(osb, lockres); |
| 1073 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1074 | mlog_exit_void(); |
| 1075 | } |
| 1076 | |
| 1077 | static int ocfs2_create_new_inode_lock(struct inode *inode, |
| 1078 | struct ocfs2_lock_res *lockres) |
| 1079 | { |
| 1080 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1081 | unsigned long flags; |
| 1082 | |
| 1083 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1084 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
| 1085 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); |
| 1086 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1087 | |
| 1088 | return ocfs2_lock_create(osb, lockres, LKM_EXMODE, LKM_LOCAL); |
| 1089 | } |
| 1090 | |
| 1091 | /* Grants us an EX lock on the data and metadata resources, skipping |
| 1092 | * the normal cluster directory lookup. Use this ONLY on newly created |
| 1093 | * inodes which other nodes can't possibly see, and which haven't been |
| 1094 | * hashed in the inode hash yet. This can give us a good performance |
| 1095 | * increase as it'll skip the network broadcast normally associated |
| 1096 | * with creating a new lock resource. */ |
| 1097 | int ocfs2_create_new_inode_locks(struct inode *inode) |
| 1098 | { |
| 1099 | int ret; |
| 1100 | |
| 1101 | BUG_ON(!inode); |
| 1102 | BUG_ON(!ocfs2_inode_is_new(inode)); |
| 1103 | |
| 1104 | mlog_entry_void(); |
| 1105 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1106 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1107 | |
| 1108 | /* NOTE: That we don't increment any of the holder counts, nor |
| 1109 | * do we add anything to a journal handle. Since this is |
| 1110 | * supposed to be a new inode which the cluster doesn't know |
| 1111 | * about yet, there is no need to. As far as the LVB handling |
| 1112 | * is concerned, this is basically like acquiring an EX lock |
| 1113 | * on a resource which has an invalid one -- we'll set it |
| 1114 | * valid when we release the EX. */ |
| 1115 | |
| 1116 | ret = ocfs2_create_new_inode_lock(inode, |
| 1117 | &OCFS2_I(inode)->ip_rw_lockres); |
| 1118 | if (ret) { |
| 1119 | mlog_errno(ret); |
| 1120 | goto bail; |
| 1121 | } |
| 1122 | |
| 1123 | ret = ocfs2_create_new_inode_lock(inode, |
| 1124 | &OCFS2_I(inode)->ip_meta_lockres); |
| 1125 | if (ret) { |
| 1126 | mlog_errno(ret); |
| 1127 | goto bail; |
| 1128 | } |
| 1129 | |
| 1130 | ret = ocfs2_create_new_inode_lock(inode, |
| 1131 | &OCFS2_I(inode)->ip_data_lockres); |
| 1132 | if (ret) { |
| 1133 | mlog_errno(ret); |
| 1134 | goto bail; |
| 1135 | } |
| 1136 | |
| 1137 | bail: |
| 1138 | mlog_exit(ret); |
| 1139 | return ret; |
| 1140 | } |
| 1141 | |
| 1142 | int ocfs2_rw_lock(struct inode *inode, int write) |
| 1143 | { |
| 1144 | int status, level; |
| 1145 | struct ocfs2_lock_res *lockres; |
| 1146 | |
| 1147 | BUG_ON(!inode); |
| 1148 | |
| 1149 | mlog_entry_void(); |
| 1150 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1151 | mlog(0, "inode %llu take %s RW lock\n", |
| 1152 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1153 | write ? "EXMODE" : "PRMODE"); |
| 1154 | |
| 1155 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
| 1156 | |
| 1157 | level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1158 | |
| 1159 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, |
| 1160 | 0); |
| 1161 | if (status < 0) |
| 1162 | mlog_errno(status); |
| 1163 | |
| 1164 | mlog_exit(status); |
| 1165 | return status; |
| 1166 | } |
| 1167 | |
| 1168 | void ocfs2_rw_unlock(struct inode *inode, int write) |
| 1169 | { |
| 1170 | int level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1171 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
| 1172 | |
| 1173 | mlog_entry_void(); |
| 1174 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1175 | mlog(0, "inode %llu drop %s RW lock\n", |
| 1176 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1177 | write ? "EXMODE" : "PRMODE"); |
| 1178 | |
| 1179 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
| 1180 | |
| 1181 | mlog_exit_void(); |
| 1182 | } |
| 1183 | |
| 1184 | int ocfs2_data_lock_full(struct inode *inode, |
| 1185 | int write, |
| 1186 | int arg_flags) |
| 1187 | { |
| 1188 | int status = 0, level; |
| 1189 | struct ocfs2_lock_res *lockres; |
| 1190 | |
| 1191 | BUG_ON(!inode); |
| 1192 | |
| 1193 | mlog_entry_void(); |
| 1194 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1195 | mlog(0, "inode %llu take %s DATA lock\n", |
| 1196 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1197 | write ? "EXMODE" : "PRMODE"); |
| 1198 | |
| 1199 | /* We'll allow faking a readonly data lock for |
| 1200 | * rodevices. */ |
| 1201 | if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { |
| 1202 | if (write) { |
| 1203 | status = -EROFS; |
| 1204 | mlog_errno(status); |
| 1205 | } |
| 1206 | goto out; |
| 1207 | } |
| 1208 | |
| 1209 | lockres = &OCFS2_I(inode)->ip_data_lockres; |
| 1210 | |
| 1211 | level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1212 | |
| 1213 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, |
| 1214 | 0, arg_flags); |
| 1215 | if (status < 0 && status != -EAGAIN) |
| 1216 | mlog_errno(status); |
| 1217 | |
| 1218 | out: |
| 1219 | mlog_exit(status); |
| 1220 | return status; |
| 1221 | } |
| 1222 | |
| 1223 | /* see ocfs2_meta_lock_with_page() */ |
| 1224 | int ocfs2_data_lock_with_page(struct inode *inode, |
| 1225 | int write, |
| 1226 | struct page *page) |
| 1227 | { |
| 1228 | int ret; |
| 1229 | |
| 1230 | ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); |
| 1231 | if (ret == -EAGAIN) { |
| 1232 | unlock_page(page); |
| 1233 | if (ocfs2_data_lock(inode, write) == 0) |
| 1234 | ocfs2_data_unlock(inode, write); |
| 1235 | ret = AOP_TRUNCATED_PAGE; |
| 1236 | } |
| 1237 | |
| 1238 | return ret; |
| 1239 | } |
| 1240 | |
| 1241 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, |
| 1242 | struct ocfs2_lock_res *lockres) |
| 1243 | { |
| 1244 | int kick = 0; |
| 1245 | |
| 1246 | mlog_entry_void(); |
| 1247 | |
| 1248 | /* If we know that another node is waiting on our lock, kick |
| 1249 | * the vote thread * pre-emptively when we reach a release |
| 1250 | * condition. */ |
| 1251 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { |
| 1252 | switch(lockres->l_blocking) { |
| 1253 | case LKM_EXMODE: |
| 1254 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
| 1255 | kick = 1; |
| 1256 | break; |
| 1257 | case LKM_PRMODE: |
| 1258 | if (!lockres->l_ex_holders) |
| 1259 | kick = 1; |
| 1260 | break; |
| 1261 | default: |
| 1262 | BUG(); |
| 1263 | } |
| 1264 | } |
| 1265 | |
| 1266 | if (kick) |
| 1267 | ocfs2_kick_vote_thread(osb); |
| 1268 | |
| 1269 | mlog_exit_void(); |
| 1270 | } |
| 1271 | |
| 1272 | void ocfs2_data_unlock(struct inode *inode, |
| 1273 | int write) |
| 1274 | { |
| 1275 | int level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1276 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; |
| 1277 | |
| 1278 | mlog_entry_void(); |
| 1279 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1280 | mlog(0, "inode %llu drop %s DATA lock\n", |
| 1281 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1282 | write ? "EXMODE" : "PRMODE"); |
| 1283 | |
| 1284 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) |
| 1285 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
| 1286 | |
| 1287 | mlog_exit_void(); |
| 1288 | } |
| 1289 | |
| 1290 | #define OCFS2_SEC_BITS 34 |
| 1291 | #define OCFS2_SEC_SHIFT (64 - 34) |
| 1292 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) |
| 1293 | |
| 1294 | /* LVB only has room for 64 bits of time here so we pack it for |
| 1295 | * now. */ |
| 1296 | static u64 ocfs2_pack_timespec(struct timespec *spec) |
| 1297 | { |
| 1298 | u64 res; |
| 1299 | u64 sec = spec->tv_sec; |
| 1300 | u32 nsec = spec->tv_nsec; |
| 1301 | |
| 1302 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); |
| 1303 | |
| 1304 | return res; |
| 1305 | } |
| 1306 | |
| 1307 | /* Call this with the lockres locked. I am reasonably sure we don't |
| 1308 | * need ip_lock in this function as anyone who would be changing those |
| 1309 | * values is supposed to be blocked in ocfs2_meta_lock right now. */ |
| 1310 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
| 1311 | { |
| 1312 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1313 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; |
| 1314 | struct ocfs2_meta_lvb *lvb; |
| 1315 | |
| 1316 | mlog_entry_void(); |
| 1317 | |
| 1318 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 1319 | |
| 1320 | lvb->lvb_version = cpu_to_be32(OCFS2_LVB_VERSION); |
| 1321 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
| 1322 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); |
| 1323 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); |
| 1324 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); |
| 1325 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
| 1326 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); |
| 1327 | lvb->lvb_iatime_packed = |
| 1328 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); |
| 1329 | lvb->lvb_ictime_packed = |
| 1330 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); |
| 1331 | lvb->lvb_imtime_packed = |
| 1332 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); |
| 1333 | |
| 1334 | mlog_meta_lvb(0, lockres); |
| 1335 | |
| 1336 | mlog_exit_void(); |
| 1337 | } |
| 1338 | |
| 1339 | static void ocfs2_unpack_timespec(struct timespec *spec, |
| 1340 | u64 packed_time) |
| 1341 | { |
| 1342 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; |
| 1343 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; |
| 1344 | } |
| 1345 | |
| 1346 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) |
| 1347 | { |
| 1348 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1349 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; |
| 1350 | struct ocfs2_meta_lvb *lvb; |
| 1351 | |
| 1352 | mlog_entry_void(); |
| 1353 | |
| 1354 | mlog_meta_lvb(0, lockres); |
| 1355 | |
| 1356 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 1357 | |
| 1358 | /* We're safe here without the lockres lock... */ |
| 1359 | spin_lock(&oi->ip_lock); |
| 1360 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); |
| 1361 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); |
| 1362 | |
| 1363 | /* fast-symlinks are a special case */ |
| 1364 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) |
| 1365 | inode->i_blocks = 0; |
| 1366 | else |
| 1367 | inode->i_blocks = |
| 1368 | ocfs2_align_bytes_to_sectors(i_size_read(inode)); |
| 1369 | |
| 1370 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); |
| 1371 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); |
| 1372 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); |
| 1373 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); |
| 1374 | ocfs2_unpack_timespec(&inode->i_atime, |
| 1375 | be64_to_cpu(lvb->lvb_iatime_packed)); |
| 1376 | ocfs2_unpack_timespec(&inode->i_mtime, |
| 1377 | be64_to_cpu(lvb->lvb_imtime_packed)); |
| 1378 | ocfs2_unpack_timespec(&inode->i_ctime, |
| 1379 | be64_to_cpu(lvb->lvb_ictime_packed)); |
| 1380 | spin_unlock(&oi->ip_lock); |
| 1381 | |
| 1382 | mlog_exit_void(); |
| 1383 | } |
| 1384 | |
| 1385 | static inline int ocfs2_meta_lvb_is_trustable(struct ocfs2_lock_res *lockres) |
| 1386 | { |
| 1387 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 1388 | |
| 1389 | if (be32_to_cpu(lvb->lvb_version) == OCFS2_LVB_VERSION) |
| 1390 | return 1; |
| 1391 | return 0; |
| 1392 | } |
| 1393 | |
| 1394 | /* Determine whether a lock resource needs to be refreshed, and |
| 1395 | * arbitrate who gets to refresh it. |
| 1396 | * |
| 1397 | * 0 means no refresh needed. |
| 1398 | * |
| 1399 | * > 0 means you need to refresh this and you MUST call |
| 1400 | * ocfs2_complete_lock_res_refresh afterwards. */ |
| 1401 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) |
| 1402 | { |
| 1403 | unsigned long flags; |
| 1404 | int status = 0; |
| 1405 | |
| 1406 | mlog_entry_void(); |
| 1407 | |
| 1408 | refresh_check: |
| 1409 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1410 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { |
| 1411 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1412 | goto bail; |
| 1413 | } |
| 1414 | |
| 1415 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { |
| 1416 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1417 | |
| 1418 | ocfs2_wait_on_refreshing_lock(lockres); |
| 1419 | goto refresh_check; |
| 1420 | } |
| 1421 | |
| 1422 | /* Ok, I'll be the one to refresh this lock. */ |
| 1423 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); |
| 1424 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1425 | |
| 1426 | status = 1; |
| 1427 | bail: |
| 1428 | mlog_exit(status); |
| 1429 | return status; |
| 1430 | } |
| 1431 | |
| 1432 | /* If status is non zero, I'll mark it as not being in refresh |
| 1433 | * anymroe, but i won't clear the needs refresh flag. */ |
| 1434 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, |
| 1435 | int status) |
| 1436 | { |
| 1437 | unsigned long flags; |
| 1438 | mlog_entry_void(); |
| 1439 | |
| 1440 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1441 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); |
| 1442 | if (!status) |
| 1443 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 1444 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1445 | |
| 1446 | wake_up(&lockres->l_event); |
| 1447 | |
| 1448 | mlog_exit_void(); |
| 1449 | } |
| 1450 | |
| 1451 | /* may or may not return a bh if it went to disk. */ |
| 1452 | static int ocfs2_meta_lock_update(struct inode *inode, |
| 1453 | struct buffer_head **bh) |
| 1454 | { |
| 1455 | int status = 0; |
| 1456 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1457 | struct ocfs2_lock_res *lockres; |
| 1458 | struct ocfs2_dinode *fe; |
| 1459 | |
| 1460 | mlog_entry_void(); |
| 1461 | |
| 1462 | spin_lock(&oi->ip_lock); |
| 1463 | if (oi->ip_flags & OCFS2_INODE_DELETED) { |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1464 | mlog(0, "Orphaned inode %llu was deleted while we " |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1465 | "were waiting on a lock. ip_flags = 0x%x\n", |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1466 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1467 | spin_unlock(&oi->ip_lock); |
| 1468 | status = -ENOENT; |
| 1469 | goto bail; |
| 1470 | } |
| 1471 | spin_unlock(&oi->ip_lock); |
| 1472 | |
| 1473 | lockres = &oi->ip_meta_lockres; |
| 1474 | |
| 1475 | if (!ocfs2_should_refresh_lock_res(lockres)) |
| 1476 | goto bail; |
| 1477 | |
| 1478 | /* This will discard any caching information we might have had |
| 1479 | * for the inode metadata. */ |
| 1480 | ocfs2_metadata_cache_purge(inode); |
| 1481 | |
| 1482 | /* will do nothing for inode types that don't use the extent |
| 1483 | * map (directories, bitmap files, etc) */ |
| 1484 | ocfs2_extent_map_trunc(inode, 0); |
| 1485 | |
| 1486 | if (ocfs2_meta_lvb_is_trustable(lockres)) { |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1487 | mlog(0, "Trusting LVB on inode %llu\n", |
| 1488 | (unsigned long long)oi->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1489 | ocfs2_refresh_inode_from_lvb(inode); |
| 1490 | } else { |
| 1491 | /* Boo, we have to go to disk. */ |
| 1492 | /* read bh, cast, ocfs2_refresh_inode */ |
| 1493 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, |
| 1494 | bh, OCFS2_BH_CACHED, inode); |
| 1495 | if (status < 0) { |
| 1496 | mlog_errno(status); |
| 1497 | goto bail_refresh; |
| 1498 | } |
| 1499 | fe = (struct ocfs2_dinode *) (*bh)->b_data; |
| 1500 | |
| 1501 | /* This is a good chance to make sure we're not |
| 1502 | * locking an invalid object. |
| 1503 | * |
| 1504 | * We bug on a stale inode here because we checked |
| 1505 | * above whether it was wiped from disk. The wiping |
| 1506 | * node provides a guarantee that we receive that |
| 1507 | * message and can mark the inode before dropping any |
| 1508 | * locks associated with it. */ |
| 1509 | if (!OCFS2_IS_VALID_DINODE(fe)) { |
| 1510 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); |
| 1511 | status = -EIO; |
| 1512 | goto bail_refresh; |
| 1513 | } |
| 1514 | mlog_bug_on_msg(inode->i_generation != |
| 1515 | le32_to_cpu(fe->i_generation), |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1516 | "Invalid dinode %llu disk generation: %u " |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1517 | "inode->i_generation: %u\n", |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1518 | (unsigned long long)oi->ip_blkno, |
| 1519 | le32_to_cpu(fe->i_generation), |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1520 | inode->i_generation); |
| 1521 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || |
| 1522 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1523 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
| 1524 | (unsigned long long)oi->ip_blkno, |
| 1525 | (unsigned long long)le64_to_cpu(fe->i_dtime), |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1526 | le32_to_cpu(fe->i_flags)); |
| 1527 | |
| 1528 | ocfs2_refresh_inode(inode, fe); |
| 1529 | } |
| 1530 | |
| 1531 | status = 0; |
| 1532 | bail_refresh: |
| 1533 | ocfs2_complete_lock_res_refresh(lockres, status); |
| 1534 | bail: |
| 1535 | mlog_exit(status); |
| 1536 | return status; |
| 1537 | } |
| 1538 | |
| 1539 | static int ocfs2_assign_bh(struct inode *inode, |
| 1540 | struct buffer_head **ret_bh, |
| 1541 | struct buffer_head *passed_bh) |
| 1542 | { |
| 1543 | int status; |
| 1544 | |
| 1545 | if (passed_bh) { |
| 1546 | /* Ok, the update went to disk for us, use the |
| 1547 | * returned bh. */ |
| 1548 | *ret_bh = passed_bh; |
| 1549 | get_bh(*ret_bh); |
| 1550 | |
| 1551 | return 0; |
| 1552 | } |
| 1553 | |
| 1554 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), |
| 1555 | OCFS2_I(inode)->ip_blkno, |
| 1556 | ret_bh, |
| 1557 | OCFS2_BH_CACHED, |
| 1558 | inode); |
| 1559 | if (status < 0) |
| 1560 | mlog_errno(status); |
| 1561 | |
| 1562 | return status; |
| 1563 | } |
| 1564 | |
| 1565 | /* |
| 1566 | * returns < 0 error if the callback will never be called, otherwise |
| 1567 | * the result of the lock will be communicated via the callback. |
| 1568 | */ |
| 1569 | int ocfs2_meta_lock_full(struct inode *inode, |
| 1570 | struct ocfs2_journal_handle *handle, |
| 1571 | struct buffer_head **ret_bh, |
| 1572 | int ex, |
| 1573 | int arg_flags) |
| 1574 | { |
| 1575 | int status, level, dlm_flags, acquired; |
| 1576 | struct ocfs2_lock_res *lockres; |
| 1577 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1578 | struct buffer_head *local_bh = NULL; |
| 1579 | |
| 1580 | BUG_ON(!inode); |
| 1581 | |
| 1582 | mlog_entry_void(); |
| 1583 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1584 | mlog(0, "inode %llu, take %s META lock\n", |
| 1585 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1586 | ex ? "EXMODE" : "PRMODE"); |
| 1587 | |
| 1588 | status = 0; |
| 1589 | acquired = 0; |
| 1590 | /* We'll allow faking a readonly metadata lock for |
| 1591 | * rodevices. */ |
| 1592 | if (ocfs2_is_hard_readonly(osb)) { |
| 1593 | if (ex) |
| 1594 | status = -EROFS; |
| 1595 | goto bail; |
| 1596 | } |
| 1597 | |
| 1598 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
| 1599 | wait_event(osb->recovery_event, |
| 1600 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); |
| 1601 | |
| 1602 | acquired = 0; |
| 1603 | lockres = &OCFS2_I(inode)->ip_meta_lockres; |
| 1604 | level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1605 | dlm_flags = 0; |
| 1606 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) |
| 1607 | dlm_flags |= LKM_NOQUEUE; |
| 1608 | |
| 1609 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); |
| 1610 | if (status < 0) { |
| 1611 | if (status != -EAGAIN && status != -EIOCBRETRY) |
| 1612 | mlog_errno(status); |
| 1613 | goto bail; |
| 1614 | } |
| 1615 | |
| 1616 | /* Notify the error cleanup path to drop the cluster lock. */ |
| 1617 | acquired = 1; |
| 1618 | |
| 1619 | /* We wait twice because a node may have died while we were in |
| 1620 | * the lower dlm layers. The second time though, we've |
| 1621 | * committed to owning this lock so we don't allow signals to |
| 1622 | * abort the operation. */ |
| 1623 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
| 1624 | wait_event(osb->recovery_event, |
| 1625 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); |
| 1626 | |
| 1627 | /* This is fun. The caller may want a bh back, or it may |
| 1628 | * not. ocfs2_meta_lock_update definitely wants one in, but |
| 1629 | * may or may not read one, depending on what's in the |
| 1630 | * LVB. The result of all of this is that we've *only* gone to |
| 1631 | * disk if we have to, so the complexity is worthwhile. */ |
| 1632 | status = ocfs2_meta_lock_update(inode, &local_bh); |
| 1633 | if (status < 0) { |
| 1634 | if (status != -ENOENT) |
| 1635 | mlog_errno(status); |
| 1636 | goto bail; |
| 1637 | } |
| 1638 | |
| 1639 | if (ret_bh) { |
| 1640 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); |
| 1641 | if (status < 0) { |
| 1642 | mlog_errno(status); |
| 1643 | goto bail; |
| 1644 | } |
| 1645 | } |
| 1646 | |
| 1647 | if (handle) { |
| 1648 | status = ocfs2_handle_add_lock(handle, inode); |
| 1649 | if (status < 0) |
| 1650 | mlog_errno(status); |
| 1651 | } |
| 1652 | |
| 1653 | bail: |
| 1654 | if (status < 0) { |
| 1655 | if (ret_bh && (*ret_bh)) { |
| 1656 | brelse(*ret_bh); |
| 1657 | *ret_bh = NULL; |
| 1658 | } |
| 1659 | if (acquired) |
| 1660 | ocfs2_meta_unlock(inode, ex); |
| 1661 | } |
| 1662 | |
| 1663 | if (local_bh) |
| 1664 | brelse(local_bh); |
| 1665 | |
| 1666 | mlog_exit(status); |
| 1667 | return status; |
| 1668 | } |
| 1669 | |
| 1670 | /* |
| 1671 | * This is working around a lock inversion between tasks acquiring DLM locks |
| 1672 | * while holding a page lock and the vote thread which blocks dlm lock acquiry |
| 1673 | * while acquiring page locks. |
| 1674 | * |
| 1675 | * ** These _with_page variantes are only intended to be called from aop |
| 1676 | * methods that hold page locks and return a very specific *positive* error |
| 1677 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** |
| 1678 | * |
| 1679 | * The DLM is called such that it returns -EAGAIN if it would have blocked |
| 1680 | * waiting for the vote thread. In that case we unlock our page so the vote |
| 1681 | * thread can make progress. Once we've done this we have to return |
| 1682 | * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up |
| 1683 | * into the VFS who will then immediately retry the aop call. |
| 1684 | * |
| 1685 | * We do a blocking lock and immediate unlock before returning, though, so that |
| 1686 | * the lock has a great chance of being cached on this node by the time the VFS |
| 1687 | * calls back to retry the aop. This has a potential to livelock as nodes |
| 1688 | * ping locks back and forth, but that's a risk we're willing to take to avoid |
| 1689 | * the lock inversion simply. |
| 1690 | */ |
| 1691 | int ocfs2_meta_lock_with_page(struct inode *inode, |
| 1692 | struct ocfs2_journal_handle *handle, |
| 1693 | struct buffer_head **ret_bh, |
| 1694 | int ex, |
| 1695 | struct page *page) |
| 1696 | { |
| 1697 | int ret; |
| 1698 | |
| 1699 | ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex, |
| 1700 | OCFS2_LOCK_NONBLOCK); |
| 1701 | if (ret == -EAGAIN) { |
| 1702 | unlock_page(page); |
| 1703 | if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0) |
| 1704 | ocfs2_meta_unlock(inode, ex); |
| 1705 | ret = AOP_TRUNCATED_PAGE; |
| 1706 | } |
| 1707 | |
| 1708 | return ret; |
| 1709 | } |
| 1710 | |
| 1711 | void ocfs2_meta_unlock(struct inode *inode, |
| 1712 | int ex) |
| 1713 | { |
| 1714 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1715 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; |
| 1716 | |
| 1717 | mlog_entry_void(); |
| 1718 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1719 | mlog(0, "inode %llu drop %s META lock\n", |
| 1720 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1721 | ex ? "EXMODE" : "PRMODE"); |
| 1722 | |
| 1723 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) |
| 1724 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
| 1725 | |
| 1726 | mlog_exit_void(); |
| 1727 | } |
| 1728 | |
| 1729 | int ocfs2_super_lock(struct ocfs2_super *osb, |
| 1730 | int ex) |
| 1731 | { |
| 1732 | int status; |
| 1733 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1734 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
| 1735 | struct buffer_head *bh; |
| 1736 | struct ocfs2_slot_info *si = osb->slot_info; |
| 1737 | |
| 1738 | mlog_entry_void(); |
| 1739 | |
| 1740 | if (ocfs2_is_hard_readonly(osb)) |
| 1741 | return -EROFS; |
| 1742 | |
| 1743 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
| 1744 | if (status < 0) { |
| 1745 | mlog_errno(status); |
| 1746 | goto bail; |
| 1747 | } |
| 1748 | |
| 1749 | /* The super block lock path is really in the best position to |
| 1750 | * know when resources covered by the lock need to be |
| 1751 | * refreshed, so we do it here. Of course, making sense of |
| 1752 | * everything is up to the caller :) */ |
| 1753 | status = ocfs2_should_refresh_lock_res(lockres); |
| 1754 | if (status < 0) { |
| 1755 | mlog_errno(status); |
| 1756 | goto bail; |
| 1757 | } |
| 1758 | if (status) { |
| 1759 | bh = si->si_bh; |
| 1760 | status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, |
| 1761 | si->si_inode); |
| 1762 | if (status == 0) |
| 1763 | ocfs2_update_slot_info(si); |
| 1764 | |
| 1765 | ocfs2_complete_lock_res_refresh(lockres, status); |
| 1766 | |
| 1767 | if (status < 0) |
| 1768 | mlog_errno(status); |
| 1769 | } |
| 1770 | bail: |
| 1771 | mlog_exit(status); |
| 1772 | return status; |
| 1773 | } |
| 1774 | |
| 1775 | void ocfs2_super_unlock(struct ocfs2_super *osb, |
| 1776 | int ex) |
| 1777 | { |
| 1778 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1779 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
| 1780 | |
| 1781 | ocfs2_cluster_unlock(osb, lockres, level); |
| 1782 | } |
| 1783 | |
| 1784 | int ocfs2_rename_lock(struct ocfs2_super *osb) |
| 1785 | { |
| 1786 | int status; |
| 1787 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; |
| 1788 | |
| 1789 | if (ocfs2_is_hard_readonly(osb)) |
| 1790 | return -EROFS; |
| 1791 | |
| 1792 | status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); |
| 1793 | if (status < 0) |
| 1794 | mlog_errno(status); |
| 1795 | |
| 1796 | return status; |
| 1797 | } |
| 1798 | |
| 1799 | void ocfs2_rename_unlock(struct ocfs2_super *osb) |
| 1800 | { |
| 1801 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; |
| 1802 | |
| 1803 | ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); |
| 1804 | } |
| 1805 | |
| 1806 | /* Reference counting of the dlm debug structure. We want this because |
| 1807 | * open references on the debug inodes can live on after a mount, so |
| 1808 | * we can't rely on the ocfs2_super to always exist. */ |
| 1809 | static void ocfs2_dlm_debug_free(struct kref *kref) |
| 1810 | { |
| 1811 | struct ocfs2_dlm_debug *dlm_debug; |
| 1812 | |
| 1813 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); |
| 1814 | |
| 1815 | kfree(dlm_debug); |
| 1816 | } |
| 1817 | |
| 1818 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) |
| 1819 | { |
| 1820 | if (dlm_debug) |
| 1821 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); |
| 1822 | } |
| 1823 | |
| 1824 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) |
| 1825 | { |
| 1826 | kref_get(&debug->d_refcnt); |
| 1827 | } |
| 1828 | |
| 1829 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) |
| 1830 | { |
| 1831 | struct ocfs2_dlm_debug *dlm_debug; |
| 1832 | |
| 1833 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); |
| 1834 | if (!dlm_debug) { |
| 1835 | mlog_errno(-ENOMEM); |
| 1836 | goto out; |
| 1837 | } |
| 1838 | |
| 1839 | kref_init(&dlm_debug->d_refcnt); |
| 1840 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); |
| 1841 | dlm_debug->d_locking_state = NULL; |
| 1842 | out: |
| 1843 | return dlm_debug; |
| 1844 | } |
| 1845 | |
| 1846 | /* Access to this is arbitrated for us via seq_file->sem. */ |
| 1847 | struct ocfs2_dlm_seq_priv { |
| 1848 | struct ocfs2_dlm_debug *p_dlm_debug; |
| 1849 | struct ocfs2_lock_res p_iter_res; |
| 1850 | struct ocfs2_lock_res p_tmp_res; |
| 1851 | }; |
| 1852 | |
| 1853 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, |
| 1854 | struct ocfs2_dlm_seq_priv *priv) |
| 1855 | { |
| 1856 | struct ocfs2_lock_res *iter, *ret = NULL; |
| 1857 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; |
| 1858 | |
| 1859 | assert_spin_locked(&ocfs2_dlm_tracking_lock); |
| 1860 | |
| 1861 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { |
| 1862 | /* discover the head of the list */ |
| 1863 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { |
| 1864 | mlog(0, "End of list found, %p\n", ret); |
| 1865 | break; |
| 1866 | } |
| 1867 | |
| 1868 | /* We track our "dummy" iteration lockres' by a NULL |
| 1869 | * l_ops field. */ |
| 1870 | if (iter->l_ops != NULL) { |
| 1871 | ret = iter; |
| 1872 | break; |
| 1873 | } |
| 1874 | } |
| 1875 | |
| 1876 | return ret; |
| 1877 | } |
| 1878 | |
| 1879 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) |
| 1880 | { |
| 1881 | struct ocfs2_dlm_seq_priv *priv = m->private; |
| 1882 | struct ocfs2_lock_res *iter; |
| 1883 | |
| 1884 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 1885 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); |
| 1886 | if (iter) { |
| 1887 | /* Since lockres' have the lifetime of their container |
| 1888 | * (which can be inodes, ocfs2_supers, etc) we want to |
| 1889 | * copy this out to a temporary lockres while still |
| 1890 | * under the spinlock. Obviously after this we can't |
| 1891 | * trust any pointers on the copy returned, but that's |
| 1892 | * ok as the information we want isn't typically held |
| 1893 | * in them. */ |
| 1894 | priv->p_tmp_res = *iter; |
| 1895 | iter = &priv->p_tmp_res; |
| 1896 | } |
| 1897 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 1898 | |
| 1899 | return iter; |
| 1900 | } |
| 1901 | |
| 1902 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) |
| 1903 | { |
| 1904 | } |
| 1905 | |
| 1906 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| 1907 | { |
| 1908 | struct ocfs2_dlm_seq_priv *priv = m->private; |
| 1909 | struct ocfs2_lock_res *iter = v; |
| 1910 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; |
| 1911 | |
| 1912 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 1913 | iter = ocfs2_dlm_next_res(iter, priv); |
| 1914 | list_del_init(&dummy->l_debug_list); |
| 1915 | if (iter) { |
| 1916 | list_add(&dummy->l_debug_list, &iter->l_debug_list); |
| 1917 | priv->p_tmp_res = *iter; |
| 1918 | iter = &priv->p_tmp_res; |
| 1919 | } |
| 1920 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 1921 | |
| 1922 | return iter; |
| 1923 | } |
| 1924 | |
| 1925 | /* So that debugfs.ocfs2 can determine which format is being used */ |
| 1926 | #define OCFS2_DLM_DEBUG_STR_VERSION 1 |
| 1927 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
| 1928 | { |
| 1929 | int i; |
| 1930 | char *lvb; |
| 1931 | struct ocfs2_lock_res *lockres = v; |
| 1932 | |
| 1933 | if (!lockres) |
| 1934 | return -EINVAL; |
| 1935 | |
| 1936 | seq_printf(m, "0x%x\t" |
| 1937 | "%.*s\t" |
| 1938 | "%d\t" |
| 1939 | "0x%lx\t" |
| 1940 | "0x%x\t" |
| 1941 | "0x%x\t" |
| 1942 | "%u\t" |
| 1943 | "%u\t" |
| 1944 | "%d\t" |
| 1945 | "%d\t", |
| 1946 | OCFS2_DLM_DEBUG_STR_VERSION, |
| 1947 | OCFS2_LOCK_ID_MAX_LEN, lockres->l_name, |
| 1948 | lockres->l_level, |
| 1949 | lockres->l_flags, |
| 1950 | lockres->l_action, |
| 1951 | lockres->l_unlock_action, |
| 1952 | lockres->l_ro_holders, |
| 1953 | lockres->l_ex_holders, |
| 1954 | lockres->l_requested, |
| 1955 | lockres->l_blocking); |
| 1956 | |
| 1957 | /* Dump the raw LVB */ |
| 1958 | lvb = lockres->l_lksb.lvb; |
| 1959 | for(i = 0; i < DLM_LVB_LEN; i++) |
| 1960 | seq_printf(m, "0x%x\t", lvb[i]); |
| 1961 | |
| 1962 | /* End the line */ |
| 1963 | seq_printf(m, "\n"); |
| 1964 | return 0; |
| 1965 | } |
| 1966 | |
| 1967 | static struct seq_operations ocfs2_dlm_seq_ops = { |
| 1968 | .start = ocfs2_dlm_seq_start, |
| 1969 | .stop = ocfs2_dlm_seq_stop, |
| 1970 | .next = ocfs2_dlm_seq_next, |
| 1971 | .show = ocfs2_dlm_seq_show, |
| 1972 | }; |
| 1973 | |
| 1974 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) |
| 1975 | { |
| 1976 | struct seq_file *seq = (struct seq_file *) file->private_data; |
| 1977 | struct ocfs2_dlm_seq_priv *priv = seq->private; |
| 1978 | struct ocfs2_lock_res *res = &priv->p_iter_res; |
| 1979 | |
| 1980 | ocfs2_remove_lockres_tracking(res); |
| 1981 | ocfs2_put_dlm_debug(priv->p_dlm_debug); |
| 1982 | return seq_release_private(inode, file); |
| 1983 | } |
| 1984 | |
| 1985 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) |
| 1986 | { |
| 1987 | int ret; |
| 1988 | struct ocfs2_dlm_seq_priv *priv; |
| 1989 | struct seq_file *seq; |
| 1990 | struct ocfs2_super *osb; |
| 1991 | |
| 1992 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); |
| 1993 | if (!priv) { |
| 1994 | ret = -ENOMEM; |
| 1995 | mlog_errno(ret); |
| 1996 | goto out; |
| 1997 | } |
| 1998 | osb = (struct ocfs2_super *) inode->u.generic_ip; |
| 1999 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
| 2000 | priv->p_dlm_debug = osb->osb_dlm_debug; |
| 2001 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); |
| 2002 | |
| 2003 | ret = seq_open(file, &ocfs2_dlm_seq_ops); |
| 2004 | if (ret) { |
| 2005 | kfree(priv); |
| 2006 | mlog_errno(ret); |
| 2007 | goto out; |
| 2008 | } |
| 2009 | |
| 2010 | seq = (struct seq_file *) file->private_data; |
| 2011 | seq->private = priv; |
| 2012 | |
| 2013 | ocfs2_add_lockres_tracking(&priv->p_iter_res, |
| 2014 | priv->p_dlm_debug); |
| 2015 | |
| 2016 | out: |
| 2017 | return ret; |
| 2018 | } |
| 2019 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2020 | static const struct file_operations ocfs2_dlm_debug_fops = { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2021 | .open = ocfs2_dlm_debug_open, |
| 2022 | .release = ocfs2_dlm_debug_release, |
| 2023 | .read = seq_read, |
| 2024 | .llseek = seq_lseek, |
| 2025 | }; |
| 2026 | |
| 2027 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) |
| 2028 | { |
| 2029 | int ret = 0; |
| 2030 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
| 2031 | |
| 2032 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", |
| 2033 | S_IFREG|S_IRUSR, |
| 2034 | osb->osb_debug_root, |
| 2035 | osb, |
| 2036 | &ocfs2_dlm_debug_fops); |
| 2037 | if (!dlm_debug->d_locking_state) { |
| 2038 | ret = -EINVAL; |
| 2039 | mlog(ML_ERROR, |
| 2040 | "Unable to create locking state debugfs file.\n"); |
| 2041 | goto out; |
| 2042 | } |
| 2043 | |
| 2044 | ocfs2_get_dlm_debug(dlm_debug); |
| 2045 | out: |
| 2046 | return ret; |
| 2047 | } |
| 2048 | |
| 2049 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) |
| 2050 | { |
| 2051 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
| 2052 | |
| 2053 | if (dlm_debug) { |
| 2054 | debugfs_remove(dlm_debug->d_locking_state); |
| 2055 | ocfs2_put_dlm_debug(dlm_debug); |
| 2056 | } |
| 2057 | } |
| 2058 | |
| 2059 | int ocfs2_dlm_init(struct ocfs2_super *osb) |
| 2060 | { |
| 2061 | int status; |
| 2062 | u32 dlm_key; |
| 2063 | struct dlm_ctxt *dlm; |
| 2064 | |
| 2065 | mlog_entry_void(); |
| 2066 | |
| 2067 | status = ocfs2_dlm_init_debug(osb); |
| 2068 | if (status < 0) { |
| 2069 | mlog_errno(status); |
| 2070 | goto bail; |
| 2071 | } |
| 2072 | |
| 2073 | /* launch vote thread */ |
| 2074 | osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote-%d", |
| 2075 | osb->osb_id); |
| 2076 | if (IS_ERR(osb->vote_task)) { |
| 2077 | status = PTR_ERR(osb->vote_task); |
| 2078 | osb->vote_task = NULL; |
| 2079 | mlog_errno(status); |
| 2080 | goto bail; |
| 2081 | } |
| 2082 | |
| 2083 | /* used by the dlm code to make message headers unique, each |
| 2084 | * node in this domain must agree on this. */ |
| 2085 | dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); |
| 2086 | |
| 2087 | /* for now, uuid == domain */ |
| 2088 | dlm = dlm_register_domain(osb->uuid_str, dlm_key); |
| 2089 | if (IS_ERR(dlm)) { |
| 2090 | status = PTR_ERR(dlm); |
| 2091 | mlog_errno(status); |
| 2092 | goto bail; |
| 2093 | } |
| 2094 | |
| 2095 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
| 2096 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); |
| 2097 | |
| 2098 | dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); |
| 2099 | |
| 2100 | osb->dlm = dlm; |
| 2101 | |
| 2102 | status = 0; |
| 2103 | bail: |
| 2104 | if (status < 0) { |
| 2105 | ocfs2_dlm_shutdown_debug(osb); |
| 2106 | if (osb->vote_task) |
| 2107 | kthread_stop(osb->vote_task); |
| 2108 | } |
| 2109 | |
| 2110 | mlog_exit(status); |
| 2111 | return status; |
| 2112 | } |
| 2113 | |
| 2114 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb) |
| 2115 | { |
| 2116 | mlog_entry_void(); |
| 2117 | |
| 2118 | dlm_unregister_eviction_cb(&osb->osb_eviction_cb); |
| 2119 | |
| 2120 | ocfs2_drop_osb_locks(osb); |
| 2121 | |
| 2122 | if (osb->vote_task) { |
| 2123 | kthread_stop(osb->vote_task); |
| 2124 | osb->vote_task = NULL; |
| 2125 | } |
| 2126 | |
| 2127 | ocfs2_lock_res_free(&osb->osb_super_lockres); |
| 2128 | ocfs2_lock_res_free(&osb->osb_rename_lockres); |
| 2129 | |
| 2130 | dlm_unregister_domain(osb->dlm); |
| 2131 | osb->dlm = NULL; |
| 2132 | |
| 2133 | ocfs2_dlm_shutdown_debug(osb); |
| 2134 | |
| 2135 | mlog_exit_void(); |
| 2136 | } |
| 2137 | |
| 2138 | static void ocfs2_unlock_ast_func(void *opaque, enum dlm_status status) |
| 2139 | { |
| 2140 | struct ocfs2_lock_res *lockres = opaque; |
| 2141 | unsigned long flags; |
| 2142 | |
| 2143 | mlog_entry_void(); |
| 2144 | |
| 2145 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, |
| 2146 | lockres->l_unlock_action); |
| 2147 | |
| 2148 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2149 | /* We tried to cancel a convert request, but it was already |
| 2150 | * granted. All we want to do here is clear our unlock |
| 2151 | * state. The wake_up call done at the bottom is redundant |
| 2152 | * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't |
| 2153 | * hurt anything anyway */ |
| 2154 | if (status == DLM_CANCELGRANT && |
| 2155 | lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
| 2156 | mlog(0, "Got cancelgrant for %s\n", lockres->l_name); |
| 2157 | |
| 2158 | /* We don't clear the busy flag in this case as it |
| 2159 | * should have been cleared by the ast which the dlm |
| 2160 | * has called. */ |
| 2161 | goto complete_unlock; |
| 2162 | } |
| 2163 | |
| 2164 | if (status != DLM_NORMAL) { |
| 2165 | mlog(ML_ERROR, "Dlm passes status %d for lock %s, " |
| 2166 | "unlock_action %d\n", status, lockres->l_name, |
| 2167 | lockres->l_unlock_action); |
| 2168 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2169 | return; |
| 2170 | } |
| 2171 | |
| 2172 | switch(lockres->l_unlock_action) { |
| 2173 | case OCFS2_UNLOCK_CANCEL_CONVERT: |
| 2174 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); |
| 2175 | lockres->l_action = OCFS2_AST_INVALID; |
| 2176 | break; |
| 2177 | case OCFS2_UNLOCK_DROP_LOCK: |
| 2178 | lockres->l_level = LKM_IVMODE; |
| 2179 | break; |
| 2180 | default: |
| 2181 | BUG(); |
| 2182 | } |
| 2183 | |
| 2184 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 2185 | complete_unlock: |
| 2186 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
| 2187 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2188 | |
| 2189 | wake_up(&lockres->l_event); |
| 2190 | |
| 2191 | mlog_exit_void(); |
| 2192 | } |
| 2193 | |
| 2194 | typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *); |
| 2195 | |
| 2196 | struct drop_lock_cb { |
| 2197 | ocfs2_pre_drop_cb_t *drop_func; |
| 2198 | void *drop_data; |
| 2199 | }; |
| 2200 | |
| 2201 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
| 2202 | struct ocfs2_lock_res *lockres, |
| 2203 | struct drop_lock_cb *dcb) |
| 2204 | { |
| 2205 | enum dlm_status status; |
| 2206 | unsigned long flags; |
| 2207 | |
| 2208 | /* We didn't get anywhere near actually using this lockres. */ |
| 2209 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) |
| 2210 | goto out; |
| 2211 | |
| 2212 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2213 | |
| 2214 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), |
| 2215 | "lockres %s, flags 0x%lx\n", |
| 2216 | lockres->l_name, lockres->l_flags); |
| 2217 | |
| 2218 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { |
| 2219 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " |
| 2220 | "%u, unlock_action = %u\n", |
| 2221 | lockres->l_name, lockres->l_flags, lockres->l_action, |
| 2222 | lockres->l_unlock_action); |
| 2223 | |
| 2224 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2225 | |
| 2226 | /* XXX: Today we just wait on any busy |
| 2227 | * locks... Perhaps we need to cancel converts in the |
| 2228 | * future? */ |
| 2229 | ocfs2_wait_on_busy_lock(lockres); |
| 2230 | |
| 2231 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2232 | } |
| 2233 | |
| 2234 | if (dcb) |
| 2235 | dcb->drop_func(lockres, dcb->drop_data); |
| 2236 | |
| 2237 | if (lockres->l_flags & OCFS2_LOCK_BUSY) |
| 2238 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", |
| 2239 | lockres->l_name); |
| 2240 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) |
| 2241 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); |
| 2242 | |
| 2243 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
| 2244 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2245 | goto out; |
| 2246 | } |
| 2247 | |
| 2248 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); |
| 2249 | |
| 2250 | /* make sure we never get here while waiting for an ast to |
| 2251 | * fire. */ |
| 2252 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); |
| 2253 | |
| 2254 | /* is this necessary? */ |
| 2255 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 2256 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; |
| 2257 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2258 | |
| 2259 | mlog(0, "lock %s\n", lockres->l_name); |
| 2260 | |
| 2261 | status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK, |
| 2262 | lockres->l_ops->unlock_ast, lockres); |
| 2263 | if (status != DLM_NORMAL) { |
| 2264 | ocfs2_log_dlm_error("dlmunlock", status, lockres); |
| 2265 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
| 2266 | dlm_print_one_lock(lockres->l_lksb.lockid); |
| 2267 | BUG(); |
| 2268 | } |
| 2269 | mlog(0, "lock %s, successfull return from dlmunlock\n", |
| 2270 | lockres->l_name); |
| 2271 | |
| 2272 | ocfs2_wait_on_busy_lock(lockres); |
| 2273 | out: |
| 2274 | mlog_exit(0); |
| 2275 | return 0; |
| 2276 | } |
| 2277 | |
| 2278 | /* Mark the lockres as being dropped. It will no longer be |
| 2279 | * queued if blocking, but we still may have to wait on it |
| 2280 | * being dequeued from the vote thread before we can consider |
| 2281 | * it safe to drop. |
| 2282 | * |
| 2283 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ |
| 2284 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) |
| 2285 | { |
| 2286 | int status; |
| 2287 | struct ocfs2_mask_waiter mw; |
| 2288 | unsigned long flags; |
| 2289 | |
| 2290 | ocfs2_init_mask_waiter(&mw); |
| 2291 | |
| 2292 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2293 | lockres->l_flags |= OCFS2_LOCK_FREEING; |
| 2294 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
| 2295 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); |
| 2296 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2297 | |
| 2298 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); |
| 2299 | |
| 2300 | status = ocfs2_wait_for_mask(&mw); |
| 2301 | if (status) |
| 2302 | mlog_errno(status); |
| 2303 | |
| 2304 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2305 | } |
| 2306 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2307 | } |
| 2308 | |
| 2309 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
| 2310 | { |
| 2311 | int status; |
| 2312 | |
| 2313 | mlog_entry_void(); |
| 2314 | |
| 2315 | ocfs2_mark_lockres_freeing(&osb->osb_super_lockres); |
| 2316 | |
| 2317 | status = ocfs2_drop_lock(osb, &osb->osb_super_lockres, NULL); |
| 2318 | if (status < 0) |
| 2319 | mlog_errno(status); |
| 2320 | |
| 2321 | ocfs2_mark_lockres_freeing(&osb->osb_rename_lockres); |
| 2322 | |
| 2323 | status = ocfs2_drop_lock(osb, &osb->osb_rename_lockres, NULL); |
| 2324 | if (status < 0) |
| 2325 | mlog_errno(status); |
| 2326 | |
| 2327 | mlog_exit(status); |
| 2328 | } |
| 2329 | |
| 2330 | static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data) |
| 2331 | { |
| 2332 | struct inode *inode = data; |
| 2333 | |
| 2334 | /* the metadata lock requires a bit more work as we have an |
| 2335 | * LVB to worry about. */ |
| 2336 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && |
| 2337 | lockres->l_level == LKM_EXMODE && |
| 2338 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
| 2339 | __ocfs2_stuff_meta_lvb(inode); |
| 2340 | } |
| 2341 | |
| 2342 | int ocfs2_drop_inode_locks(struct inode *inode) |
| 2343 | { |
| 2344 | int status, err; |
| 2345 | struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, }; |
| 2346 | |
| 2347 | mlog_entry_void(); |
| 2348 | |
| 2349 | /* No need to call ocfs2_mark_lockres_freeing here - |
| 2350 | * ocfs2_clear_inode has done it for us. */ |
| 2351 | |
| 2352 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
| 2353 | &OCFS2_I(inode)->ip_data_lockres, |
| 2354 | NULL); |
| 2355 | if (err < 0) |
| 2356 | mlog_errno(err); |
| 2357 | |
| 2358 | status = err; |
| 2359 | |
| 2360 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
| 2361 | &OCFS2_I(inode)->ip_meta_lockres, |
| 2362 | &meta_dcb); |
| 2363 | if (err < 0) |
| 2364 | mlog_errno(err); |
| 2365 | if (err < 0 && !status) |
| 2366 | status = err; |
| 2367 | |
| 2368 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
| 2369 | &OCFS2_I(inode)->ip_rw_lockres, |
| 2370 | NULL); |
| 2371 | if (err < 0) |
| 2372 | mlog_errno(err); |
| 2373 | if (err < 0 && !status) |
| 2374 | status = err; |
| 2375 | |
| 2376 | mlog_exit(status); |
| 2377 | return status; |
| 2378 | } |
| 2379 | |
| 2380 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
| 2381 | int new_level) |
| 2382 | { |
| 2383 | assert_spin_locked(&lockres->l_lock); |
| 2384 | |
| 2385 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); |
| 2386 | |
| 2387 | if (lockres->l_level <= new_level) { |
| 2388 | mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", |
| 2389 | lockres->l_level, new_level); |
| 2390 | BUG(); |
| 2391 | } |
| 2392 | |
| 2393 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", |
| 2394 | lockres->l_name, new_level, lockres->l_blocking); |
| 2395 | |
| 2396 | lockres->l_action = OCFS2_AST_DOWNCONVERT; |
| 2397 | lockres->l_requested = new_level; |
| 2398 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 2399 | } |
| 2400 | |
| 2401 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
| 2402 | struct ocfs2_lock_res *lockres, |
| 2403 | int new_level, |
| 2404 | int lvb) |
| 2405 | { |
| 2406 | int ret, dlm_flags = LKM_CONVERT; |
| 2407 | enum dlm_status status; |
| 2408 | |
| 2409 | mlog_entry_void(); |
| 2410 | |
| 2411 | if (lvb) |
| 2412 | dlm_flags |= LKM_VALBLK; |
| 2413 | |
| 2414 | status = dlmlock(osb->dlm, |
| 2415 | new_level, |
| 2416 | &lockres->l_lksb, |
| 2417 | dlm_flags, |
| 2418 | lockres->l_name, |
| 2419 | lockres->l_ops->ast, |
| 2420 | lockres, |
| 2421 | lockres->l_ops->bast); |
| 2422 | if (status != DLM_NORMAL) { |
| 2423 | ocfs2_log_dlm_error("dlmlock", status, lockres); |
| 2424 | ret = -EINVAL; |
| 2425 | ocfs2_recover_from_dlm_error(lockres, 1); |
| 2426 | goto bail; |
| 2427 | } |
| 2428 | |
| 2429 | ret = 0; |
| 2430 | bail: |
| 2431 | mlog_exit(ret); |
| 2432 | return ret; |
| 2433 | } |
| 2434 | |
| 2435 | /* returns 1 when the caller should unlock and call dlmunlock */ |
| 2436 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
| 2437 | struct ocfs2_lock_res *lockres) |
| 2438 | { |
| 2439 | assert_spin_locked(&lockres->l_lock); |
| 2440 | |
| 2441 | mlog_entry_void(); |
| 2442 | mlog(0, "lock %s\n", lockres->l_name); |
| 2443 | |
| 2444 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
| 2445 | /* If we're already trying to cancel a lock conversion |
| 2446 | * then just drop the spinlock and allow the caller to |
| 2447 | * requeue this lock. */ |
| 2448 | |
| 2449 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); |
| 2450 | return 0; |
| 2451 | } |
| 2452 | |
| 2453 | /* were we in a convert when we got the bast fire? */ |
| 2454 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && |
| 2455 | lockres->l_action != OCFS2_AST_DOWNCONVERT); |
| 2456 | /* set things up for the unlockast to know to just |
| 2457 | * clear out the ast_action and unset busy, etc. */ |
| 2458 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; |
| 2459 | |
| 2460 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), |
| 2461 | "lock %s, invalid flags: 0x%lx\n", |
| 2462 | lockres->l_name, lockres->l_flags); |
| 2463 | |
| 2464 | return 1; |
| 2465 | } |
| 2466 | |
| 2467 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, |
| 2468 | struct ocfs2_lock_res *lockres) |
| 2469 | { |
| 2470 | int ret; |
| 2471 | enum dlm_status status; |
| 2472 | |
| 2473 | mlog_entry_void(); |
| 2474 | mlog(0, "lock %s\n", lockres->l_name); |
| 2475 | |
| 2476 | ret = 0; |
| 2477 | status = dlmunlock(osb->dlm, |
| 2478 | &lockres->l_lksb, |
| 2479 | LKM_CANCEL, |
| 2480 | lockres->l_ops->unlock_ast, |
| 2481 | lockres); |
| 2482 | if (status != DLM_NORMAL) { |
| 2483 | ocfs2_log_dlm_error("dlmunlock", status, lockres); |
| 2484 | ret = -EINVAL; |
| 2485 | ocfs2_recover_from_dlm_error(lockres, 0); |
| 2486 | } |
| 2487 | |
| 2488 | mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); |
| 2489 | |
| 2490 | mlog_exit(ret); |
| 2491 | return ret; |
| 2492 | } |
| 2493 | |
| 2494 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, |
| 2495 | struct ocfs2_lock_res *lockres, |
| 2496 | int new_level) |
| 2497 | { |
| 2498 | int ret; |
| 2499 | |
| 2500 | mlog_entry_void(); |
| 2501 | |
| 2502 | BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); |
| 2503 | |
| 2504 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { |
| 2505 | ret = 0; |
| 2506 | mlog(0, "lockres %s currently being refreshed -- backing " |
| 2507 | "off!\n", lockres->l_name); |
| 2508 | } else if (new_level == LKM_PRMODE) |
| 2509 | ret = !lockres->l_ex_holders && |
| 2510 | ocfs2_inode_fully_checkpointed(inode); |
| 2511 | else /* Must be NLMODE we're converting to. */ |
| 2512 | ret = !lockres->l_ro_holders && !lockres->l_ex_holders && |
| 2513 | ocfs2_inode_fully_checkpointed(inode); |
| 2514 | |
| 2515 | mlog_exit(ret); |
| 2516 | return ret; |
| 2517 | } |
| 2518 | |
| 2519 | static int ocfs2_do_unblock_meta(struct inode *inode, |
| 2520 | int *requeue) |
| 2521 | { |
| 2522 | int new_level; |
| 2523 | int set_lvb = 0; |
| 2524 | int ret = 0; |
| 2525 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; |
| 2526 | unsigned long flags; |
| 2527 | |
| 2528 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 2529 | |
| 2530 | mlog_entry_void(); |
| 2531 | |
| 2532 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2533 | |
| 2534 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 2535 | |
| 2536 | mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level, |
| 2537 | lockres->l_blocking); |
| 2538 | |
| 2539 | BUG_ON(lockres->l_level != LKM_EXMODE && |
| 2540 | lockres->l_level != LKM_PRMODE); |
| 2541 | |
| 2542 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
| 2543 | *requeue = 1; |
| 2544 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
| 2545 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2546 | if (ret) { |
| 2547 | ret = ocfs2_cancel_convert(osb, lockres); |
| 2548 | if (ret < 0) |
| 2549 | mlog_errno(ret); |
| 2550 | } |
| 2551 | goto leave; |
| 2552 | } |
| 2553 | |
| 2554 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
| 2555 | |
| 2556 | mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n", |
| 2557 | lockres->l_level, lockres->l_blocking, new_level); |
| 2558 | |
| 2559 | if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) { |
| 2560 | if (lockres->l_level == LKM_EXMODE) |
| 2561 | set_lvb = 1; |
| 2562 | |
| 2563 | /* If the lock hasn't been refreshed yet (rare), then |
| 2564 | * our memory inode values are old and we skip |
| 2565 | * stuffing the lvb. There's no need to actually clear |
| 2566 | * out the lvb here as it's value is still valid. */ |
| 2567 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { |
| 2568 | if (set_lvb) |
| 2569 | __ocfs2_stuff_meta_lvb(inode); |
| 2570 | } else |
| 2571 | mlog(0, "lockres %s: downconverting stale lock!\n", |
| 2572 | lockres->l_name); |
| 2573 | |
| 2574 | mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, " |
| 2575 | "l_blocking=%d, new_level=%d\n", |
| 2576 | lockres->l_level, lockres->l_blocking, new_level); |
| 2577 | |
| 2578 | ocfs2_prepare_downconvert(lockres, new_level); |
| 2579 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2580 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); |
| 2581 | goto leave; |
| 2582 | } |
| 2583 | if (!ocfs2_inode_fully_checkpointed(inode)) |
| 2584 | ocfs2_start_checkpoint(osb); |
| 2585 | |
| 2586 | *requeue = 1; |
| 2587 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2588 | ret = 0; |
| 2589 | leave: |
| 2590 | mlog_exit(ret); |
| 2591 | return ret; |
| 2592 | } |
| 2593 | |
| 2594 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, |
| 2595 | struct ocfs2_lock_res *lockres, |
| 2596 | int *requeue, |
| 2597 | ocfs2_convert_worker_t *worker) |
| 2598 | { |
| 2599 | unsigned long flags; |
| 2600 | int blocking; |
| 2601 | int new_level; |
| 2602 | int ret = 0; |
| 2603 | |
| 2604 | mlog_entry_void(); |
| 2605 | |
| 2606 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2607 | |
| 2608 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 2609 | |
| 2610 | recheck: |
| 2611 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
| 2612 | *requeue = 1; |
| 2613 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
| 2614 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2615 | if (ret) { |
| 2616 | ret = ocfs2_cancel_convert(osb, lockres); |
| 2617 | if (ret < 0) |
| 2618 | mlog_errno(ret); |
| 2619 | } |
| 2620 | goto leave; |
| 2621 | } |
| 2622 | |
| 2623 | /* if we're blocking an exclusive and we have *any* holders, |
| 2624 | * then requeue. */ |
| 2625 | if ((lockres->l_blocking == LKM_EXMODE) |
| 2626 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { |
| 2627 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2628 | *requeue = 1; |
| 2629 | ret = 0; |
| 2630 | goto leave; |
| 2631 | } |
| 2632 | |
| 2633 | /* If it's a PR we're blocking, then only |
| 2634 | * requeue if we've got any EX holders */ |
| 2635 | if (lockres->l_blocking == LKM_PRMODE && |
| 2636 | lockres->l_ex_holders) { |
| 2637 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2638 | *requeue = 1; |
| 2639 | ret = 0; |
| 2640 | goto leave; |
| 2641 | } |
| 2642 | |
| 2643 | /* If we get here, then we know that there are no more |
| 2644 | * incompatible holders (and anyone asking for an incompatible |
| 2645 | * lock is blocked). We can now downconvert the lock */ |
| 2646 | if (!worker) |
| 2647 | goto downconvert; |
| 2648 | |
| 2649 | /* Some lockres types want to do a bit of work before |
| 2650 | * downconverting a lock. Allow that here. The worker function |
| 2651 | * may sleep, so we save off a copy of what we're blocking as |
| 2652 | * it may change while we're not holding the spin lock. */ |
| 2653 | blocking = lockres->l_blocking; |
| 2654 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2655 | |
| 2656 | worker(lockres, blocking); |
| 2657 | |
| 2658 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2659 | if (blocking != lockres->l_blocking) { |
| 2660 | /* If this changed underneath us, then we can't drop |
| 2661 | * it just yet. */ |
| 2662 | goto recheck; |
| 2663 | } |
| 2664 | |
| 2665 | downconvert: |
| 2666 | *requeue = 0; |
| 2667 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
| 2668 | |
| 2669 | ocfs2_prepare_downconvert(lockres, new_level); |
| 2670 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2671 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0); |
| 2672 | leave: |
| 2673 | mlog_exit(ret); |
| 2674 | return ret; |
| 2675 | } |
| 2676 | |
| 2677 | static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
| 2678 | int blocking) |
| 2679 | { |
| 2680 | struct inode *inode; |
| 2681 | struct address_space *mapping; |
| 2682 | |
| 2683 | mlog_entry_void(); |
| 2684 | |
| 2685 | inode = ocfs2_lock_res_inode(lockres); |
| 2686 | mapping = inode->i_mapping; |
| 2687 | |
| 2688 | if (filemap_fdatawrite(mapping)) { |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2689 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
| 2690 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2691 | } |
| 2692 | sync_mapping_buffers(mapping); |
| 2693 | if (blocking == LKM_EXMODE) { |
| 2694 | truncate_inode_pages(mapping, 0); |
| 2695 | unmap_mapping_range(mapping, 0, 0, 0); |
| 2696 | } else { |
| 2697 | /* We only need to wait on the I/O if we're not also |
| 2698 | * truncating pages because truncate_inode_pages waits |
| 2699 | * for us above. We don't truncate pages if we're |
| 2700 | * blocking anything < EXMODE because we want to keep |
| 2701 | * them around in that case. */ |
| 2702 | filemap_fdatawait(mapping); |
| 2703 | } |
| 2704 | |
| 2705 | mlog_exit_void(); |
| 2706 | } |
| 2707 | |
| 2708 | int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, |
| 2709 | int *requeue) |
| 2710 | { |
| 2711 | int status; |
| 2712 | struct inode *inode; |
| 2713 | struct ocfs2_super *osb; |
| 2714 | |
| 2715 | mlog_entry_void(); |
| 2716 | |
| 2717 | inode = ocfs2_lock_res_inode(lockres); |
| 2718 | osb = OCFS2_SB(inode->i_sb); |
| 2719 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2720 | mlog(0, "unblock inode %llu\n", |
| 2721 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2722 | |
| 2723 | status = ocfs2_generic_unblock_lock(osb, |
| 2724 | lockres, |
| 2725 | requeue, |
| 2726 | ocfs2_data_convert_worker); |
| 2727 | if (status < 0) |
| 2728 | mlog_errno(status); |
| 2729 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2730 | mlog(0, "inode %llu, requeue = %d\n", |
| 2731 | (unsigned long long)OCFS2_I(inode)->ip_blkno, *requeue); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2732 | |
| 2733 | mlog_exit(status); |
| 2734 | return status; |
| 2735 | } |
| 2736 | |
| 2737 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, |
| 2738 | int *requeue) |
| 2739 | { |
| 2740 | int status; |
| 2741 | struct inode *inode; |
| 2742 | |
| 2743 | mlog_entry_void(); |
| 2744 | |
| 2745 | mlog(0, "Unblock lockres %s\n", lockres->l_name); |
| 2746 | |
| 2747 | inode = ocfs2_lock_res_inode(lockres); |
| 2748 | |
| 2749 | status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb), |
| 2750 | lockres, |
| 2751 | requeue, |
| 2752 | NULL); |
| 2753 | if (status < 0) |
| 2754 | mlog_errno(status); |
| 2755 | |
| 2756 | mlog_exit(status); |
| 2757 | return status; |
| 2758 | } |
| 2759 | |
| 2760 | |
| 2761 | int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, |
| 2762 | int *requeue) |
| 2763 | { |
| 2764 | int status; |
| 2765 | struct inode *inode; |
| 2766 | |
| 2767 | mlog_entry_void(); |
| 2768 | |
| 2769 | inode = ocfs2_lock_res_inode(lockres); |
| 2770 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2771 | mlog(0, "unblock inode %llu\n", |
| 2772 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2773 | |
| 2774 | status = ocfs2_do_unblock_meta(inode, requeue); |
| 2775 | if (status < 0) |
| 2776 | mlog_errno(status); |
| 2777 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2778 | mlog(0, "inode %llu, requeue = %d\n", |
| 2779 | (unsigned long long)OCFS2_I(inode)->ip_blkno, *requeue); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2780 | |
| 2781 | mlog_exit(status); |
| 2782 | return status; |
| 2783 | } |
| 2784 | |
| 2785 | /* Generic unblock function for any lockres whose private data is an |
| 2786 | * ocfs2_super pointer. */ |
| 2787 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, |
| 2788 | int *requeue) |
| 2789 | { |
| 2790 | int status; |
| 2791 | struct ocfs2_super *osb; |
| 2792 | |
| 2793 | mlog_entry_void(); |
| 2794 | |
| 2795 | mlog(0, "Unblock lockres %s\n", lockres->l_name); |
| 2796 | |
| 2797 | osb = ocfs2_lock_res_super(lockres); |
| 2798 | |
| 2799 | status = ocfs2_generic_unblock_lock(osb, |
| 2800 | lockres, |
| 2801 | requeue, |
| 2802 | NULL); |
| 2803 | if (status < 0) |
| 2804 | mlog_errno(status); |
| 2805 | |
| 2806 | mlog_exit(status); |
| 2807 | return status; |
| 2808 | } |
| 2809 | |
| 2810 | void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
| 2811 | struct ocfs2_lock_res *lockres) |
| 2812 | { |
| 2813 | int status; |
| 2814 | int requeue = 0; |
| 2815 | unsigned long flags; |
| 2816 | |
| 2817 | /* Our reference to the lockres in this function can be |
| 2818 | * considered valid until we remove the OCFS2_LOCK_QUEUED |
| 2819 | * flag. */ |
| 2820 | |
| 2821 | mlog_entry_void(); |
| 2822 | |
| 2823 | BUG_ON(!lockres); |
| 2824 | BUG_ON(!lockres->l_ops); |
| 2825 | BUG_ON(!lockres->l_ops->unblock); |
| 2826 | |
| 2827 | mlog(0, "lockres %s blocked.\n", lockres->l_name); |
| 2828 | |
| 2829 | /* Detect whether a lock has been marked as going away while |
| 2830 | * the vote thread was processing other things. A lock can |
| 2831 | * still be marked with OCFS2_LOCK_FREEING after this check, |
| 2832 | * but short circuiting here will still save us some |
| 2833 | * performance. */ |
| 2834 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2835 | if (lockres->l_flags & OCFS2_LOCK_FREEING) |
| 2836 | goto unqueue; |
| 2837 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2838 | |
| 2839 | status = lockres->l_ops->unblock(lockres, &requeue); |
| 2840 | if (status < 0) |
| 2841 | mlog_errno(status); |
| 2842 | |
| 2843 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2844 | unqueue: |
| 2845 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !requeue) { |
| 2846 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
| 2847 | } else |
| 2848 | ocfs2_schedule_blocked_lock(osb, lockres); |
| 2849 | |
| 2850 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, |
| 2851 | requeue ? "yes" : "no"); |
| 2852 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2853 | |
| 2854 | mlog_exit_void(); |
| 2855 | } |
| 2856 | |
| 2857 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, |
| 2858 | struct ocfs2_lock_res *lockres) |
| 2859 | { |
| 2860 | mlog_entry_void(); |
| 2861 | |
| 2862 | assert_spin_locked(&lockres->l_lock); |
| 2863 | |
| 2864 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { |
| 2865 | /* Do not schedule a lock for downconvert when it's on |
| 2866 | * the way to destruction - any nodes wanting access |
| 2867 | * to the resource will get it soon. */ |
| 2868 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", |
| 2869 | lockres->l_name, lockres->l_flags); |
| 2870 | return; |
| 2871 | } |
| 2872 | |
| 2873 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); |
| 2874 | |
| 2875 | spin_lock(&osb->vote_task_lock); |
| 2876 | if (list_empty(&lockres->l_blocked_list)) { |
| 2877 | list_add_tail(&lockres->l_blocked_list, |
| 2878 | &osb->blocked_lock_list); |
| 2879 | osb->blocked_lock_count++; |
| 2880 | } |
| 2881 | spin_unlock(&osb->vote_task_lock); |
| 2882 | |
| 2883 | mlog_exit_void(); |
| 2884 | } |
| 2885 | |
| 2886 | /* This aids in debugging situations where a bad LVB might be involved. */ |
| 2887 | void ocfs2_dump_meta_lvb_info(u64 level, |
| 2888 | const char *function, |
| 2889 | unsigned int line, |
| 2890 | struct ocfs2_lock_res *lockres) |
| 2891 | { |
| 2892 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 2893 | |
| 2894 | mlog(level, "LVB information for %s (called from %s:%u):\n", |
| 2895 | lockres->l_name, function, line); |
| 2896 | mlog(level, "version: %u, clusters: %u\n", |
| 2897 | be32_to_cpu(lvb->lvb_version), be32_to_cpu(lvb->lvb_iclusters)); |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2898 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", |
| 2899 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), |
| 2900 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), |
| 2901 | be16_to_cpu(lvb->lvb_imode)); |
| 2902 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " |
| 2903 | "mtime_packed 0x%llx\n", be16_to_cpu(lvb->lvb_inlink), |
| 2904 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), |
| 2905 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), |
| 2906 | (long long)be64_to_cpu(lvb->lvb_imtime_packed)); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2907 | } |