1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * journal.h 5 * 6 * Defines journalling api and structures. 7 * 8 * Copyright (C) 2003, 2005 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 #ifndef OCFS2_JOURNAL_H 27 #define OCFS2_JOURNAL_H 28 29 #include <linux/fs.h> 30 #include <linux/jbd2.h> 31 32 enum ocfs2_journal_state { 33 OCFS2_JOURNAL_FREE = 0, 34 OCFS2_JOURNAL_LOADED, 35 OCFS2_JOURNAL_IN_SHUTDOWN, 36 }; 37 38 struct ocfs2_super; 39 struct ocfs2_dinode; 40 41 /* 42 * The recovery_list is a simple linked list of node numbers to recover. 43 * It is protected by the recovery_lock. 44 */ 45 46 struct ocfs2_recovery_map { 47 unsigned int rm_used; 48 unsigned int *rm_entries; 49 }; 50 51 52 struct ocfs2_journal { 53 enum ocfs2_journal_state j_state; /* Journals current state */ 54 55 journal_t *j_journal; /* The kernels journal type */ 56 struct inode *j_inode; /* Kernel inode pointing to 57 * this journal */ 58 struct ocfs2_super *j_osb; /* pointer to the super 59 * block for the node 60 * we're currently 61 * running on -- not 62 * necessarily the super 63 * block from the node 64 * which we usually run 65 * from (recovery, 66 * etc) */ 67 struct buffer_head *j_bh; /* Journal disk inode block */ 68 atomic_t j_num_trans; /* Number of transactions 69 * currently in the system. */ 70 spinlock_t j_lock; 71 unsigned long j_trans_id; 72 struct rw_semaphore j_trans_barrier; 73 wait_queue_head_t j_checkpointed; 74 75 /* both fields protected by j_lock*/ 76 struct list_head j_la_cleanups; 77 struct work_struct j_recovery_work; 78 }; 79 80 extern spinlock_t trans_inc_lock; 81 82 /* wrap j_trans_id so we never have it equal to zero. */ 83 static inline unsigned long ocfs2_inc_trans_id(struct ocfs2_journal *j) 84 { 85 unsigned long old_id; 86 spin_lock(&trans_inc_lock); 87 old_id = j->j_trans_id++; 88 if (unlikely(!j->j_trans_id)) 89 j->j_trans_id = 1; 90 spin_unlock(&trans_inc_lock); 91 return old_id; 92 } 93 94 static inline void ocfs2_set_ci_lock_trans(struct ocfs2_journal *journal, 95 struct ocfs2_caching_info *ci) 96 { 97 spin_lock(&trans_inc_lock); 98 ci->ci_last_trans = journal->j_trans_id; 99 spin_unlock(&trans_inc_lock); 100 } 101 102 /* Used to figure out whether it's safe to drop a metadata lock on an 103 * cached object. Returns true if all the object's changes have been 104 * checkpointed to disk. You should be holding the spinlock on the 105 * metadata lock while calling this to be sure that nobody can take 106 * the lock and put it on another transaction. */ 107 static inline int ocfs2_ci_fully_checkpointed(struct ocfs2_caching_info *ci) 108 { 109 int ret; 110 struct ocfs2_journal *journal = 111 OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal; 112 113 spin_lock(&trans_inc_lock); 114 ret = time_after(journal->j_trans_id, ci->ci_last_trans); 115 spin_unlock(&trans_inc_lock); 116 return ret; 117 } 118 119 /* convenience function to check if an object backed by struct 120 * ocfs2_caching_info is still new (has never hit disk) Will do you a 121 * favor and set created_trans = 0 when you've 122 * been checkpointed. returns '1' if the ci is still new. */ 123 static inline int ocfs2_ci_is_new(struct ocfs2_caching_info *ci) 124 { 125 int ret; 126 struct ocfs2_journal *journal = 127 OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal; 128 129 spin_lock(&trans_inc_lock); 130 ret = !(time_after(journal->j_trans_id, ci->ci_created_trans)); 131 if (!ret) 132 ci->ci_created_trans = 0; 133 spin_unlock(&trans_inc_lock); 134 return ret; 135 } 136 137 /* Wrapper for inodes so we can check system files */ 138 static inline int ocfs2_inode_is_new(struct inode *inode) 139 { 140 /* System files are never "new" as they're written out by 141 * mkfs. This helps us early during mount, before we have the 142 * journal open and j_trans_id could be junk. */ 143 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) 144 return 0; 145 146 return ocfs2_ci_is_new(INODE_CACHE(inode)); 147 } 148 149 static inline void ocfs2_ci_set_new(struct ocfs2_super *osb, 150 struct ocfs2_caching_info *ci) 151 { 152 spin_lock(&trans_inc_lock); 153 ci->ci_created_trans = osb->journal->j_trans_id; 154 spin_unlock(&trans_inc_lock); 155 } 156 157 /* Exported only for the journal struct init code in super.c. Do not call. */ 158 void ocfs2_orphan_scan_init(struct ocfs2_super *osb); 159 void ocfs2_orphan_scan_start(struct ocfs2_super *osb); 160 void ocfs2_orphan_scan_stop(struct ocfs2_super *osb); 161 void ocfs2_orphan_scan_exit(struct ocfs2_super *osb); 162 163 void ocfs2_complete_recovery(struct work_struct *work); 164 void ocfs2_wait_for_recovery(struct ocfs2_super *osb); 165 166 int ocfs2_recovery_init(struct ocfs2_super *osb); 167 void ocfs2_recovery_exit(struct ocfs2_super *osb); 168 169 int ocfs2_compute_replay_slots(struct ocfs2_super *osb); 170 /* 171 * Journal Control: 172 * Initialize, Load, Shutdown, Wipe a journal. 173 * 174 * ocfs2_journal_init - Initialize journal structures in the OSB. 175 * ocfs2_journal_load - Load the given journal off disk. Replay it if 176 * there's transactions still in there. 177 * ocfs2_journal_shutdown - Shutdown a journal, this will flush all 178 * uncommitted, uncheckpointed transactions. 179 * ocfs2_journal_wipe - Wipe transactions from a journal. Optionally 180 * zero out each block. 181 * ocfs2_recovery_thread - Perform recovery on a node. osb is our own osb. 182 * ocfs2_mark_dead_nodes - Start recovery on nodes we won't get a heartbeat 183 * event on. 184 * ocfs2_start_checkpoint - Kick the commit thread to do a checkpoint. 185 */ 186 void ocfs2_set_journal_params(struct ocfs2_super *osb); 187 int ocfs2_journal_init(struct ocfs2_journal *journal, 188 int *dirty); 189 void ocfs2_journal_shutdown(struct ocfs2_super *osb); 190 int ocfs2_journal_wipe(struct ocfs2_journal *journal, 191 int full); 192 int ocfs2_journal_load(struct ocfs2_journal *journal, int local, 193 int replayed); 194 int ocfs2_check_journals_nolocks(struct ocfs2_super *osb); 195 void ocfs2_recovery_thread(struct ocfs2_super *osb, 196 int node_num); 197 int ocfs2_mark_dead_nodes(struct ocfs2_super *osb); 198 void ocfs2_complete_mount_recovery(struct ocfs2_super *osb); 199 void ocfs2_complete_quota_recovery(struct ocfs2_super *osb); 200 201 static inline void ocfs2_start_checkpoint(struct ocfs2_super *osb) 202 { 203 wake_up(&osb->checkpoint_event); 204 } 205 206 static inline void ocfs2_checkpoint_inode(struct inode *inode) 207 { 208 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 209 210 if (ocfs2_mount_local(osb)) 211 return; 212 213 if (!ocfs2_ci_fully_checkpointed(INODE_CACHE(inode))) { 214 /* WARNING: This only kicks off a single 215 * checkpoint. If someone races you and adds more 216 * metadata to the journal, you won't know, and will 217 * wind up waiting *a lot* longer than necessary. Right 218 * now we only use this in clear_inode so that's 219 * OK. */ 220 ocfs2_start_checkpoint(osb); 221 222 wait_event(osb->journal->j_checkpointed, 223 ocfs2_ci_fully_checkpointed(INODE_CACHE(inode))); 224 } 225 } 226 227 /* 228 * Transaction Handling: 229 * Manage the lifetime of a transaction handle. 230 * 231 * ocfs2_start_trans - Begin a transaction. Give it an upper estimate of 232 * the number of blocks that will be changed during 233 * this handle. 234 * ocfs2_commit_trans - Complete a handle. It might return -EIO if 235 * the journal was aborted. The majority of paths don't 236 * check the return value as an error there comes too 237 * late to do anything (and will be picked up in a 238 * later transaction). 239 * ocfs2_extend_trans - Extend a handle by nblocks credits. This may 240 * commit the handle to disk in the process, but will 241 * not release any locks taken during the transaction. 242 * ocfs2_journal_access* - Notify the handle that we want to journal this 243 * buffer. Will have to call ocfs2_journal_dirty once 244 * we've actually dirtied it. Type is one of . or . 245 * Always call the specific flavor of 246 * ocfs2_journal_access_*() unless you intend to 247 * manage the checksum by hand. 248 * ocfs2_journal_dirty - Mark a journalled buffer as having dirty data. 249 * ocfs2_jbd2_file_inode - Mark an inode so that its data goes out before 250 * the current handle commits. 251 */ 252 253 /* You must always start_trans with a number of buffs > 0, but it's 254 * perfectly legal to go through an entire transaction without having 255 * dirtied any buffers. */ 256 handle_t *ocfs2_start_trans(struct ocfs2_super *osb, 257 int max_buffs); 258 int ocfs2_commit_trans(struct ocfs2_super *osb, 259 handle_t *handle); 260 int ocfs2_extend_trans(handle_t *handle, int nblocks); 261 int ocfs2_allocate_extend_trans(handle_t *handle, 262 int thresh); 263 264 /* 265 * Define an arbitrary limit for the amount of data we will anticipate 266 * writing to any given transaction. For unbounded transactions such as 267 * fallocate(2) we can write more than this, but we always 268 * start off at the maximum transaction size and grow the transaction 269 * optimistically as we go. 270 */ 271 #define OCFS2_MAX_TRANS_DATA 64U 272 273 /* 274 * Create access is for when we get a newly created buffer and we're 275 * not gonna read it off disk, but rather fill it ourselves. Right 276 * now, we don't do anything special with this (it turns into a write 277 * request), but this is a good placeholder in case we do... 278 * 279 * Write access is for when we read a block off disk and are going to 280 * modify it. This way the journalling layer knows it may need to make 281 * a copy of that block (if it's part of another, uncommitted 282 * transaction) before we do so. 283 */ 284 #define OCFS2_JOURNAL_ACCESS_CREATE 0 285 #define OCFS2_JOURNAL_ACCESS_WRITE 1 286 #define OCFS2_JOURNAL_ACCESS_UNDO 2 287 288 289 /* ocfs2_inode */ 290 int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci, 291 struct buffer_head *bh, int type); 292 /* ocfs2_extent_block */ 293 int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci, 294 struct buffer_head *bh, int type); 295 /* ocfs2_refcount_block */ 296 int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci, 297 struct buffer_head *bh, int type); 298 /* ocfs2_group_desc */ 299 int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci, 300 struct buffer_head *bh, int type); 301 /* ocfs2_xattr_block */ 302 int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci, 303 struct buffer_head *bh, int type); 304 /* quota blocks */ 305 int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci, 306 struct buffer_head *bh, int type); 307 /* dirblock */ 308 int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci, 309 struct buffer_head *bh, int type); 310 /* ocfs2_dx_root_block */ 311 int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci, 312 struct buffer_head *bh, int type); 313 /* ocfs2_dx_leaf */ 314 int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci, 315 struct buffer_head *bh, int type); 316 /* Anything that has no ecc */ 317 int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci, 318 struct buffer_head *bh, int type); 319 320 /* 321 * A word about the journal_access/journal_dirty "dance". It is 322 * entirely legal to journal_access a buffer more than once (as long 323 * as the access type is the same -- I'm not sure what will happen if 324 * access type is different but this should never happen anyway) It is 325 * also legal to journal_dirty a buffer more than once. In fact, you 326 * can even journal_access a buffer after you've done a 327 * journal_access/journal_dirty pair. The only thing you cannot do 328 * however, is journal_dirty a buffer which you haven't yet passed to 329 * journal_access at least once. 330 * 331 * That said, 99% of the time this doesn't matter and this is what the 332 * path looks like: 333 * 334 * <read a bh> 335 * ocfs2_journal_access(handle, bh, OCFS2_JOURNAL_ACCESS_WRITE); 336 * <modify the bh> 337 * ocfs2_journal_dirty(handle, bh); 338 */ 339 void ocfs2_journal_dirty(handle_t *handle, struct buffer_head *bh); 340 341 /* 342 * Credit Macros: 343 * Convenience macros to calculate number of credits needed. 344 * 345 * For convenience sake, I have a set of macros here which calculate 346 * the *maximum* number of sectors which will be changed for various 347 * metadata updates. 348 */ 349 350 /* simple file updates like chmod, etc. */ 351 #define OCFS2_INODE_UPDATE_CREDITS 1 352 353 /* extended attribute block update */ 354 #define OCFS2_XATTR_BLOCK_UPDATE_CREDITS 1 355 356 /* Update of a single quota block */ 357 #define OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 1 358 359 /* global quotafile inode update, data block */ 360 #define OCFS2_QINFO_WRITE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \ 361 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS) 362 363 #define OCFS2_LOCAL_QINFO_WRITE_CREDITS OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 364 /* 365 * The two writes below can accidentally see global info dirty due 366 * to set_info() quotactl so make them prepared for the writes. 367 */ 368 /* quota data block, global info */ 369 /* Write to local quota file */ 370 #define OCFS2_QWRITE_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \ 371 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS) 372 373 /* global quota data block, local quota data block, global quota inode, 374 * global quota info */ 375 #define OCFS2_QSYNC_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \ 376 2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS) 377 378 static inline int ocfs2_quota_trans_credits(struct super_block *sb) 379 { 380 int credits = 0; 381 382 if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) 383 credits += OCFS2_QWRITE_CREDITS; 384 if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) 385 credits += OCFS2_QWRITE_CREDITS; 386 return credits; 387 } 388 389 /* group extend. inode update and last group update. */ 390 #define OCFS2_GROUP_EXTEND_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 391 392 /* group add. inode update and the new group update. */ 393 #define OCFS2_GROUP_ADD_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 394 395 /* get one bit out of a suballocator: dinode + group descriptor + 396 * prev. group desc. if we relink. */ 397 #define OCFS2_SUBALLOC_ALLOC (3) 398 399 static inline int ocfs2_inline_to_extents_credits(struct super_block *sb) 400 { 401 return OCFS2_SUBALLOC_ALLOC + OCFS2_INODE_UPDATE_CREDITS + 402 ocfs2_quota_trans_credits(sb); 403 } 404 405 /* dinode + group descriptor update. We don't relink on free yet. */ 406 #define OCFS2_SUBALLOC_FREE (2) 407 408 #define OCFS2_TRUNCATE_LOG_UPDATE OCFS2_INODE_UPDATE_CREDITS 409 #define OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC (OCFS2_SUBALLOC_FREE \ 410 + OCFS2_TRUNCATE_LOG_UPDATE) 411 412 static inline int ocfs2_remove_extent_credits(struct super_block *sb) 413 { 414 return OCFS2_TRUNCATE_LOG_UPDATE + OCFS2_INODE_UPDATE_CREDITS + 415 ocfs2_quota_trans_credits(sb); 416 } 417 418 /* data block for new dir/symlink, allocation of directory block, dx_root 419 * update for free list */ 420 #define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + OCFS2_SUBALLOC_ALLOC + 1) 421 422 static inline int ocfs2_add_dir_index_credits(struct super_block *sb) 423 { 424 /* 1 block for index, 2 allocs (data, metadata), 1 clusters 425 * worth of blocks for initial extent. */ 426 return 1 + 2 * OCFS2_SUBALLOC_ALLOC + 427 ocfs2_clusters_to_blocks(sb, 1); 428 } 429 430 /* parent fe, parent block, new file entry, index leaf, inode alloc fe, inode 431 * alloc group descriptor + mkdir/symlink blocks + dir blocks + xattr 432 * blocks + quota update */ 433 static inline int ocfs2_mknod_credits(struct super_block *sb, int is_dir, 434 int xattr_credits) 435 { 436 int dir_credits = OCFS2_DIR_LINK_ADDITIONAL_CREDITS; 437 438 if (is_dir) 439 dir_credits += ocfs2_add_dir_index_credits(sb); 440 441 return 4 + OCFS2_SUBALLOC_ALLOC + dir_credits + xattr_credits + 442 ocfs2_quota_trans_credits(sb); 443 } 444 445 /* local alloc metadata change + main bitmap updates */ 446 #define OCFS2_WINDOW_MOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS \ 447 + OCFS2_SUBALLOC_ALLOC + OCFS2_SUBALLOC_FREE) 448 449 /* used when we don't need an allocation change for a dir extend. One 450 * for the dinode, one for the new block. */ 451 #define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2) 452 453 /* file update (nlink, etc) + directory mtime/ctime + dir entry block + quota 454 * update on dir + index leaf + dx root update for free list + 455 * previous dirblock update in the free list */ 456 static inline int ocfs2_link_credits(struct super_block *sb) 457 { 458 return 2*OCFS2_INODE_UPDATE_CREDITS + 4 + 459 ocfs2_quota_trans_credits(sb); 460 } 461 462 /* inode + dir inode (if we unlink a dir), + dir entry block + orphan 463 * dir inode link + dir inode index leaf + dir index root */ 464 static inline int ocfs2_unlink_credits(struct super_block *sb) 465 { 466 /* The quota update from ocfs2_link_credits is unused here... */ 467 return 2 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_link_credits(sb); 468 } 469 470 /* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry + 471 * inode alloc group descriptor + orphan dir index root + 472 * orphan dir index leaf */ 473 #define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 4) 474 475 /* dinode + orphan dir dinode + extent tree leaf block + orphan dir entry + 476 * orphan dir index root + orphan dir index leaf */ 477 #define OCFS2_INODE_ADD_TO_ORPHAN_CREDITS (2 * OCFS2_INODE_UPDATE_CREDITS + 4) 478 #define OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS OCFS2_INODE_ADD_TO_ORPHAN_CREDITS 479 480 /* dinode update, old dir dinode update, new dir dinode update, old 481 * dir dir entry, new dir dir entry, dir entry update for renaming 482 * directory + target unlink + 3 x dir index leaves */ 483 static inline int ocfs2_rename_credits(struct super_block *sb) 484 { 485 return 3 * OCFS2_INODE_UPDATE_CREDITS + 6 + ocfs2_unlink_credits(sb); 486 } 487 488 /* global bitmap dinode, group desc., relinked group, 489 * suballocator dinode, group desc., relinked group, 490 * dinode, xattr block */ 491 #define OCFS2_XATTR_BLOCK_CREATE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + \ 492 + OCFS2_INODE_UPDATE_CREDITS \ 493 + OCFS2_XATTR_BLOCK_UPDATE_CREDITS) 494 495 /* inode update, removal of dx root block from allocator */ 496 #define OCFS2_DX_ROOT_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \ 497 OCFS2_SUBALLOC_FREE) 498 499 static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb) 500 { 501 int credits = 1 + OCFS2_SUBALLOC_ALLOC; 502 503 credits += ocfs2_clusters_to_blocks(sb, 1); 504 credits += ocfs2_quota_trans_credits(sb); 505 506 return credits; 507 } 508 509 /* inode update, new refcount block and its allocation credits. */ 510 #define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \ 511 + OCFS2_SUBALLOC_ALLOC) 512 513 /* inode and the refcount block update. */ 514 #define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 515 516 /* 517 * inode and the refcount block update. 518 * It doesn't include the credits for sub alloc change. 519 * So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added. 520 */ 521 #define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 522 523 /* 2 metadata alloc, 2 new blocks and root refcount block */ 524 #define OCFS2_EXPAND_REFCOUNT_TREE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + 3) 525 526 /* 527 * Please note that the caller must make sure that root_el is the root 528 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 529 * the result may be wrong. 530 */ 531 static inline int ocfs2_calc_extend_credits(struct super_block *sb, 532 struct ocfs2_extent_list *root_el) 533 { 534 int bitmap_blocks, sysfile_bitmap_blocks, extent_blocks; 535 536 /* bitmap dinode, group desc. + relinked group. */ 537 bitmap_blocks = OCFS2_SUBALLOC_ALLOC; 538 539 /* we might need to shift tree depth so lets assume an 540 * absolute worst case of complete fragmentation. Even with 541 * that, we only need one update for the dinode, and then 542 * however many metadata chunks needed * a remaining suballoc 543 * alloc. */ 544 sysfile_bitmap_blocks = 1 + 545 (OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(root_el); 546 547 /* this does not include *new* metadata blocks, which are 548 * accounted for in sysfile_bitmap_blocks. root_el + 549 * prev. last_eb_blk + blocks along edge of tree. 550 * calc_symlink_credits passes because we just need 1 551 * credit for the dinode there. */ 552 extent_blocks = 1 + 1 + le16_to_cpu(root_el->l_tree_depth); 553 554 return bitmap_blocks + sysfile_bitmap_blocks + extent_blocks + 555 ocfs2_quota_trans_credits(sb); 556 } 557 558 static inline int ocfs2_calc_symlink_credits(struct super_block *sb) 559 { 560 int blocks = ocfs2_mknod_credits(sb, 0, 0); 561 562 /* links can be longer than one block so we may update many 563 * within our single allocated extent. */ 564 blocks += ocfs2_clusters_to_blocks(sb, 1); 565 566 return blocks + ocfs2_quota_trans_credits(sb); 567 } 568 569 static inline int ocfs2_calc_group_alloc_credits(struct super_block *sb, 570 unsigned int cpg) 571 { 572 int blocks; 573 int bitmap_blocks = OCFS2_SUBALLOC_ALLOC + 1; 574 /* parent inode update + new block group header + bitmap inode update 575 + bitmap blocks affected */ 576 blocks = 1 + 1 + 1 + bitmap_blocks; 577 return blocks; 578 } 579 580 /* 581 * Allocating a discontiguous block group requires the credits from 582 * ocfs2_calc_group_alloc_credits() as well as enough credits to fill 583 * the group descriptor's extent list. The caller already has started 584 * the transaction with ocfs2_calc_group_alloc_credits(). They extend 585 * it with these credits. 586 */ 587 static inline int ocfs2_calc_bg_discontig_credits(struct super_block *sb) 588 { 589 return ocfs2_extent_recs_per_gd(sb); 590 } 591 592 static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb, 593 unsigned int clusters_to_del, 594 struct ocfs2_dinode *fe, 595 struct ocfs2_extent_list *last_el) 596 { 597 /* for dinode + all headers in this pass + update to next leaf */ 598 u16 next_free = le16_to_cpu(last_el->l_next_free_rec); 599 u16 tree_depth = le16_to_cpu(fe->id2.i_list.l_tree_depth); 600 int credits = 1 + tree_depth + 1; 601 int i; 602 603 i = next_free - 1; 604 BUG_ON(i < 0); 605 606 /* We may be deleting metadata blocks, so metadata alloc dinode + 607 one desc. block for each possible delete. */ 608 if (tree_depth && next_free == 1 && 609 ocfs2_rec_clusters(last_el, &last_el->l_recs[i]) == clusters_to_del) 610 credits += 1 + tree_depth; 611 612 /* update to the truncate log. */ 613 credits += OCFS2_TRUNCATE_LOG_UPDATE; 614 615 credits += ocfs2_quota_trans_credits(sb); 616 617 return credits; 618 } 619 620 static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode) 621 { 622 return jbd2_journal_inode_add_write(handle, &OCFS2_I(inode)->ip_jinode); 623 } 624 625 static inline int ocfs2_begin_ordered_truncate(struct inode *inode, 626 loff_t new_size) 627 { 628 return jbd2_journal_begin_ordered_truncate( 629 OCFS2_SB(inode->i_sb)->journal->j_journal, 630 &OCFS2_I(inode)->ip_jinode, 631 new_size); 632 } 633 634 static inline void ocfs2_update_inode_fsync_trans(handle_t *handle, 635 struct inode *inode, 636 int datasync) 637 { 638 struct ocfs2_inode_info *oi = OCFS2_I(inode); 639 640 oi->i_sync_tid = handle->h_transaction->t_tid; 641 if (datasync) 642 oi->i_datasync_tid = handle->h_transaction->t_tid; 643 } 644 645 #endif /* OCFS2_JOURNAL_H */ 646