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); 261 262 /* 263 * Create access is for when we get a newly created buffer and we're 264 * not gonna read it off disk, but rather fill it ourselves. Right 265 * now, we don't do anything special with this (it turns into a write 266 * request), but this is a good placeholder in case we do... 267 * 268 * Write access is for when we read a block off disk and are going to 269 * modify it. This way the journalling layer knows it may need to make 270 * a copy of that block (if it's part of another, uncommitted 271 * transaction) before we do so. 272 */ 273 #define OCFS2_JOURNAL_ACCESS_CREATE 0 274 #define OCFS2_JOURNAL_ACCESS_WRITE 1 275 #define OCFS2_JOURNAL_ACCESS_UNDO 2 276 277 278 /* ocfs2_inode */ 279 int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci, 280 struct buffer_head *bh, int type); 281 /* ocfs2_extent_block */ 282 int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci, 283 struct buffer_head *bh, int type); 284 /* ocfs2_refcount_block */ 285 int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci, 286 struct buffer_head *bh, int type); 287 /* ocfs2_group_desc */ 288 int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci, 289 struct buffer_head *bh, int type); 290 /* ocfs2_xattr_block */ 291 int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci, 292 struct buffer_head *bh, int type); 293 /* quota blocks */ 294 int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci, 295 struct buffer_head *bh, int type); 296 /* dirblock */ 297 int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci, 298 struct buffer_head *bh, int type); 299 /* ocfs2_dx_root_block */ 300 int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci, 301 struct buffer_head *bh, int type); 302 /* ocfs2_dx_leaf */ 303 int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci, 304 struct buffer_head *bh, int type); 305 /* Anything that has no ecc */ 306 int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci, 307 struct buffer_head *bh, int type); 308 309 /* 310 * A word about the journal_access/journal_dirty "dance". It is 311 * entirely legal to journal_access a buffer more than once (as long 312 * as the access type is the same -- I'm not sure what will happen if 313 * access type is different but this should never happen anyway) It is 314 * also legal to journal_dirty a buffer more than once. In fact, you 315 * can even journal_access a buffer after you've done a 316 * journal_access/journal_dirty pair. The only thing you cannot do 317 * however, is journal_dirty a buffer which you haven't yet passed to 318 * journal_access at least once. 319 * 320 * That said, 99% of the time this doesn't matter and this is what the 321 * path looks like: 322 * 323 * <read a bh> 324 * ocfs2_journal_access(handle, bh, OCFS2_JOURNAL_ACCESS_WRITE); 325 * <modify the bh> 326 * ocfs2_journal_dirty(handle, bh); 327 */ 328 void ocfs2_journal_dirty(handle_t *handle, struct buffer_head *bh); 329 330 /* 331 * Credit Macros: 332 * Convenience macros to calculate number of credits needed. 333 * 334 * For convenience sake, I have a set of macros here which calculate 335 * the *maximum* number of sectors which will be changed for various 336 * metadata updates. 337 */ 338 339 /* simple file updates like chmod, etc. */ 340 #define OCFS2_INODE_UPDATE_CREDITS 1 341 342 /* extended attribute block update */ 343 #define OCFS2_XATTR_BLOCK_UPDATE_CREDITS 1 344 345 /* Update of a single quota block */ 346 #define OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 1 347 348 /* global quotafile inode update, data block */ 349 #define OCFS2_QINFO_WRITE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \ 350 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS) 351 352 #define OCFS2_LOCAL_QINFO_WRITE_CREDITS OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 353 /* 354 * The two writes below can accidentally see global info dirty due 355 * to set_info() quotactl so make them prepared for the writes. 356 */ 357 /* quota data block, global info */ 358 /* Write to local quota file */ 359 #define OCFS2_QWRITE_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \ 360 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS) 361 362 /* global quota data block, local quota data block, global quota inode, 363 * global quota info */ 364 #define OCFS2_QSYNC_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \ 365 2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS) 366 367 static inline int ocfs2_quota_trans_credits(struct super_block *sb) 368 { 369 int credits = 0; 370 371 if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) 372 credits += OCFS2_QWRITE_CREDITS; 373 if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) 374 credits += OCFS2_QWRITE_CREDITS; 375 return credits; 376 } 377 378 /* group extend. inode update and last group update. */ 379 #define OCFS2_GROUP_EXTEND_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 380 381 /* group add. inode update and the new group update. */ 382 #define OCFS2_GROUP_ADD_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 383 384 /* get one bit out of a suballocator: dinode + group descriptor + 385 * prev. group desc. if we relink. */ 386 #define OCFS2_SUBALLOC_ALLOC (3) 387 388 static inline int ocfs2_inline_to_extents_credits(struct super_block *sb) 389 { 390 return OCFS2_SUBALLOC_ALLOC + OCFS2_INODE_UPDATE_CREDITS + 391 ocfs2_quota_trans_credits(sb); 392 } 393 394 /* dinode + group descriptor update. We don't relink on free yet. */ 395 #define OCFS2_SUBALLOC_FREE (2) 396 397 #define OCFS2_TRUNCATE_LOG_UPDATE OCFS2_INODE_UPDATE_CREDITS 398 #define OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC (OCFS2_SUBALLOC_FREE \ 399 + OCFS2_TRUNCATE_LOG_UPDATE) 400 401 static inline int ocfs2_remove_extent_credits(struct super_block *sb) 402 { 403 return OCFS2_TRUNCATE_LOG_UPDATE + OCFS2_INODE_UPDATE_CREDITS + 404 ocfs2_quota_trans_credits(sb); 405 } 406 407 /* data block for new dir/symlink, allocation of directory block, dx_root 408 * update for free list */ 409 #define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + OCFS2_SUBALLOC_ALLOC + 1) 410 411 static inline int ocfs2_add_dir_index_credits(struct super_block *sb) 412 { 413 /* 1 block for index, 2 allocs (data, metadata), 1 clusters 414 * worth of blocks for initial extent. */ 415 return 1 + 2 * OCFS2_SUBALLOC_ALLOC + 416 ocfs2_clusters_to_blocks(sb, 1); 417 } 418 419 /* parent fe, parent block, new file entry, index leaf, inode alloc fe, inode 420 * alloc group descriptor + mkdir/symlink blocks + dir blocks + xattr 421 * blocks + quota update */ 422 static inline int ocfs2_mknod_credits(struct super_block *sb, int is_dir, 423 int xattr_credits) 424 { 425 int dir_credits = OCFS2_DIR_LINK_ADDITIONAL_CREDITS; 426 427 if (is_dir) 428 dir_credits += ocfs2_add_dir_index_credits(sb); 429 430 return 4 + OCFS2_SUBALLOC_ALLOC + dir_credits + xattr_credits + 431 ocfs2_quota_trans_credits(sb); 432 } 433 434 /* local alloc metadata change + main bitmap updates */ 435 #define OCFS2_WINDOW_MOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS \ 436 + OCFS2_SUBALLOC_ALLOC + OCFS2_SUBALLOC_FREE) 437 438 /* used when we don't need an allocation change for a dir extend. One 439 * for the dinode, one for the new block. */ 440 #define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2) 441 442 /* file update (nlink, etc) + directory mtime/ctime + dir entry block + quota 443 * update on dir + index leaf + dx root update for free list + 444 * previous dirblock update in the free list */ 445 static inline int ocfs2_link_credits(struct super_block *sb) 446 { 447 return 2*OCFS2_INODE_UPDATE_CREDITS + 4 + 448 ocfs2_quota_trans_credits(sb); 449 } 450 451 /* inode + dir inode (if we unlink a dir), + dir entry block + orphan 452 * dir inode link + dir inode index leaf + dir index root */ 453 static inline int ocfs2_unlink_credits(struct super_block *sb) 454 { 455 /* The quota update from ocfs2_link_credits is unused here... */ 456 return 2 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_link_credits(sb); 457 } 458 459 /* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry + 460 * inode alloc group descriptor + orphan dir index root + 461 * orphan dir index leaf */ 462 #define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 4) 463 464 /* dinode update, old dir dinode update, new dir dinode update, old 465 * dir dir entry, new dir dir entry, dir entry update for renaming 466 * directory + target unlink + 3 x dir index leaves */ 467 static inline int ocfs2_rename_credits(struct super_block *sb) 468 { 469 return 3 * OCFS2_INODE_UPDATE_CREDITS + 6 + ocfs2_unlink_credits(sb); 470 } 471 472 /* global bitmap dinode, group desc., relinked group, 473 * suballocator dinode, group desc., relinked group, 474 * dinode, xattr block */ 475 #define OCFS2_XATTR_BLOCK_CREATE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + \ 476 + OCFS2_INODE_UPDATE_CREDITS \ 477 + OCFS2_XATTR_BLOCK_UPDATE_CREDITS) 478 479 /* inode update, removal of dx root block from allocator */ 480 #define OCFS2_DX_ROOT_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \ 481 OCFS2_SUBALLOC_FREE) 482 483 static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb) 484 { 485 int credits = 1 + OCFS2_SUBALLOC_ALLOC; 486 487 credits += ocfs2_clusters_to_blocks(sb, 1); 488 credits += ocfs2_quota_trans_credits(sb); 489 490 return credits; 491 } 492 493 /* inode update, new refcount block and its allocation credits. */ 494 #define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \ 495 + OCFS2_SUBALLOC_ALLOC) 496 497 /* inode and the refcount block update. */ 498 #define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 499 500 /* 501 * inode and the refcount block update. 502 * It doesn't include the credits for sub alloc change. 503 * So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added. 504 */ 505 #define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1) 506 507 /* 2 metadata alloc, 2 new blocks and root refcount block */ 508 #define OCFS2_EXPAND_REFCOUNT_TREE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + 3) 509 510 /* 511 * Please note that the caller must make sure that root_el is the root 512 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 513 * the result may be wrong. 514 */ 515 static inline int ocfs2_calc_extend_credits(struct super_block *sb, 516 struct ocfs2_extent_list *root_el, 517 u32 bits_wanted) 518 { 519 int bitmap_blocks, sysfile_bitmap_blocks, extent_blocks; 520 521 /* bitmap dinode, group desc. + relinked group. */ 522 bitmap_blocks = OCFS2_SUBALLOC_ALLOC; 523 524 /* we might need to shift tree depth so lets assume an 525 * absolute worst case of complete fragmentation. Even with 526 * that, we only need one update for the dinode, and then 527 * however many metadata chunks needed * a remaining suballoc 528 * alloc. */ 529 sysfile_bitmap_blocks = 1 + 530 (OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(root_el); 531 532 /* this does not include *new* metadata blocks, which are 533 * accounted for in sysfile_bitmap_blocks. root_el + 534 * prev. last_eb_blk + blocks along edge of tree. 535 * calc_symlink_credits passes because we just need 1 536 * credit for the dinode there. */ 537 extent_blocks = 1 + 1 + le16_to_cpu(root_el->l_tree_depth); 538 539 return bitmap_blocks + sysfile_bitmap_blocks + extent_blocks + 540 ocfs2_quota_trans_credits(sb); 541 } 542 543 static inline int ocfs2_calc_symlink_credits(struct super_block *sb) 544 { 545 int blocks = ocfs2_mknod_credits(sb, 0, 0); 546 547 /* links can be longer than one block so we may update many 548 * within our single allocated extent. */ 549 blocks += ocfs2_clusters_to_blocks(sb, 1); 550 551 return blocks + ocfs2_quota_trans_credits(sb); 552 } 553 554 static inline int ocfs2_calc_group_alloc_credits(struct super_block *sb, 555 unsigned int cpg) 556 { 557 int blocks; 558 int bitmap_blocks = OCFS2_SUBALLOC_ALLOC + 1; 559 /* parent inode update + new block group header + bitmap inode update 560 + bitmap blocks affected */ 561 blocks = 1 + 1 + 1 + bitmap_blocks; 562 return blocks; 563 } 564 565 /* 566 * Allocating a discontiguous block group requires the credits from 567 * ocfs2_calc_group_alloc_credits() as well as enough credits to fill 568 * the group descriptor's extent list. The caller already has started 569 * the transaction with ocfs2_calc_group_alloc_credits(). They extend 570 * it with these credits. 571 */ 572 static inline int ocfs2_calc_bg_discontig_credits(struct super_block *sb) 573 { 574 return ocfs2_extent_recs_per_gd(sb); 575 } 576 577 static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb, 578 unsigned int clusters_to_del, 579 struct ocfs2_dinode *fe, 580 struct ocfs2_extent_list *last_el) 581 { 582 /* for dinode + all headers in this pass + update to next leaf */ 583 u16 next_free = le16_to_cpu(last_el->l_next_free_rec); 584 u16 tree_depth = le16_to_cpu(fe->id2.i_list.l_tree_depth); 585 int credits = 1 + tree_depth + 1; 586 int i; 587 588 i = next_free - 1; 589 BUG_ON(i < 0); 590 591 /* We may be deleting metadata blocks, so metadata alloc dinode + 592 one desc. block for each possible delete. */ 593 if (tree_depth && next_free == 1 && 594 ocfs2_rec_clusters(last_el, &last_el->l_recs[i]) == clusters_to_del) 595 credits += 1 + tree_depth; 596 597 /* update to the truncate log. */ 598 credits += OCFS2_TRUNCATE_LOG_UPDATE; 599 600 credits += ocfs2_quota_trans_credits(sb); 601 602 return credits; 603 } 604 605 static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode) 606 { 607 return jbd2_journal_file_inode(handle, &OCFS2_I(inode)->ip_jinode); 608 } 609 610 static inline int ocfs2_begin_ordered_truncate(struct inode *inode, 611 loff_t new_size) 612 { 613 return jbd2_journal_begin_ordered_truncate( 614 OCFS2_SB(inode->i_sb)->journal->j_journal, 615 &OCFS2_I(inode)->ip_jinode, 616 new_size); 617 } 618 619 #endif /* OCFS2_JOURNAL_H */ 620