linux/fs/ocfs2/journal.h
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   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * journal.h
   4 *
   5 * Defines journalling api and structures.
   6 *
   7 * Copyright (C) 2003, 2005 Oracle.  All rights reserved.
   8 */
   9
  10#ifndef OCFS2_JOURNAL_H
  11#define OCFS2_JOURNAL_H
  12
  13#include <linux/fs.h>
  14#include <linux/jbd2.h>
  15
  16enum ocfs2_journal_state {
  17        OCFS2_JOURNAL_FREE = 0,
  18        OCFS2_JOURNAL_LOADED,
  19        OCFS2_JOURNAL_IN_SHUTDOWN,
  20};
  21
  22struct ocfs2_super;
  23struct ocfs2_dinode;
  24
  25/*
  26 * The recovery_list is a simple linked list of node numbers to recover.
  27 * It is protected by the recovery_lock.
  28 */
  29
  30struct ocfs2_recovery_map {
  31        unsigned int rm_used;
  32        unsigned int *rm_entries;
  33};
  34
  35
  36struct ocfs2_journal {
  37        enum ocfs2_journal_state   j_state;    /* Journals current state   */
  38
  39        journal_t                 *j_journal; /* The kernels journal type */
  40        struct inode              *j_inode;   /* Kernel inode pointing to
  41                                               * this journal             */
  42        struct ocfs2_super        *j_osb;     /* pointer to the super
  43                                               * block for the node
  44                                               * we're currently
  45                                               * running on -- not
  46                                               * necessarily the super
  47                                               * block from the node
  48                                               * which we usually run
  49                                               * from (recovery,
  50                                               * etc)                     */
  51        struct buffer_head        *j_bh;      /* Journal disk inode block */
  52        atomic_t                  j_num_trans; /* Number of transactions
  53                                                * currently in the system. */
  54        spinlock_t                j_lock;
  55        unsigned long             j_trans_id;
  56        struct rw_semaphore       j_trans_barrier;
  57        wait_queue_head_t         j_checkpointed;
  58
  59        /* both fields protected by j_lock*/
  60        struct list_head          j_la_cleanups;
  61        struct work_struct        j_recovery_work;
  62};
  63
  64extern spinlock_t trans_inc_lock;
  65
  66/* wrap j_trans_id so we never have it equal to zero. */
  67static inline unsigned long ocfs2_inc_trans_id(struct ocfs2_journal *j)
  68{
  69        unsigned long old_id;
  70        spin_lock(&trans_inc_lock);
  71        old_id = j->j_trans_id++;
  72        if (unlikely(!j->j_trans_id))
  73                j->j_trans_id = 1;
  74        spin_unlock(&trans_inc_lock);
  75        return old_id;
  76}
  77
  78static inline void ocfs2_set_ci_lock_trans(struct ocfs2_journal *journal,
  79                                           struct ocfs2_caching_info *ci)
  80{
  81        spin_lock(&trans_inc_lock);
  82        ci->ci_last_trans = journal->j_trans_id;
  83        spin_unlock(&trans_inc_lock);
  84}
  85
  86/* Used to figure out whether it's safe to drop a metadata lock on an
  87 * cached object. Returns true if all the object's changes have been
  88 * checkpointed to disk. You should be holding the spinlock on the
  89 * metadata lock while calling this to be sure that nobody can take
  90 * the lock and put it on another transaction. */
  91static inline int ocfs2_ci_fully_checkpointed(struct ocfs2_caching_info *ci)
  92{
  93        int ret;
  94        struct ocfs2_journal *journal =
  95                OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
  96
  97        spin_lock(&trans_inc_lock);
  98        ret = time_after(journal->j_trans_id, ci->ci_last_trans);
  99        spin_unlock(&trans_inc_lock);
 100        return ret;
 101}
 102
 103/* convenience function to check if an object backed by struct
 104 * ocfs2_caching_info  is still new (has never hit disk) Will do you a
 105 * favor and set created_trans = 0 when you've
 106 * been checkpointed.  returns '1' if the ci is still new. */
 107static inline int ocfs2_ci_is_new(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_created_trans));
 115        if (!ret)
 116                ci->ci_created_trans = 0;
 117        spin_unlock(&trans_inc_lock);
 118        return ret;
 119}
 120
 121/* Wrapper for inodes so we can check system files */
 122static inline int ocfs2_inode_is_new(struct inode *inode)
 123{
 124        /* System files are never "new" as they're written out by
 125         * mkfs. This helps us early during mount, before we have the
 126         * journal open and j_trans_id could be junk. */
 127        if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
 128                return 0;
 129
 130        return ocfs2_ci_is_new(INODE_CACHE(inode));
 131}
 132
 133static inline void ocfs2_ci_set_new(struct ocfs2_super *osb,
 134                                    struct ocfs2_caching_info *ci)
 135{
 136        spin_lock(&trans_inc_lock);
 137        ci->ci_created_trans = osb->journal->j_trans_id;
 138        spin_unlock(&trans_inc_lock);
 139}
 140
 141/* Exported only for the journal struct init code in super.c. Do not call. */
 142void ocfs2_orphan_scan_init(struct ocfs2_super *osb);
 143void ocfs2_orphan_scan_start(struct ocfs2_super *osb);
 144void ocfs2_orphan_scan_stop(struct ocfs2_super *osb);
 145
 146void ocfs2_complete_recovery(struct work_struct *work);
 147void ocfs2_wait_for_recovery(struct ocfs2_super *osb);
 148
 149int ocfs2_recovery_init(struct ocfs2_super *osb);
 150void ocfs2_recovery_exit(struct ocfs2_super *osb);
 151
 152int ocfs2_compute_replay_slots(struct ocfs2_super *osb);
 153/*
 154 *  Journal Control:
 155 *  Initialize, Load, Shutdown, Wipe a journal.
 156 *
 157 *  ocfs2_journal_init     - Initialize journal structures in the OSB.
 158 *  ocfs2_journal_load     - Load the given journal off disk. Replay it if
 159 *                          there's transactions still in there.
 160 *  ocfs2_journal_shutdown - Shutdown a journal, this will flush all
 161 *                          uncommitted, uncheckpointed transactions.
 162 *  ocfs2_journal_wipe     - Wipe transactions from a journal. Optionally
 163 *                          zero out each block.
 164 *  ocfs2_recovery_thread  - Perform recovery on a node. osb is our own osb.
 165 *  ocfs2_mark_dead_nodes - Start recovery on nodes we won't get a heartbeat
 166 *                          event on.
 167 *  ocfs2_start_checkpoint - Kick the commit thread to do a checkpoint.
 168 */
 169void   ocfs2_set_journal_params(struct ocfs2_super *osb);
 170int    ocfs2_journal_init(struct ocfs2_journal *journal,
 171                          int *dirty);
 172void   ocfs2_journal_shutdown(struct ocfs2_super *osb);
 173int    ocfs2_journal_wipe(struct ocfs2_journal *journal,
 174                          int full);
 175int    ocfs2_journal_load(struct ocfs2_journal *journal, int local,
 176                          int replayed);
 177int    ocfs2_check_journals_nolocks(struct ocfs2_super *osb);
 178void   ocfs2_recovery_thread(struct ocfs2_super *osb,
 179                             int node_num);
 180int    ocfs2_mark_dead_nodes(struct ocfs2_super *osb);
 181void   ocfs2_complete_mount_recovery(struct ocfs2_super *osb);
 182void ocfs2_complete_quota_recovery(struct ocfs2_super *osb);
 183
 184static inline void ocfs2_start_checkpoint(struct ocfs2_super *osb)
 185{
 186        wake_up(&osb->checkpoint_event);
 187}
 188
 189static inline void ocfs2_checkpoint_inode(struct inode *inode)
 190{
 191        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 192
 193        if (ocfs2_mount_local(osb))
 194                return;
 195
 196        if (!ocfs2_ci_fully_checkpointed(INODE_CACHE(inode))) {
 197                /* WARNING: This only kicks off a single
 198                 * checkpoint. If someone races you and adds more
 199                 * metadata to the journal, you won't know, and will
 200                 * wind up waiting *a lot* longer than necessary. Right
 201                 * now we only use this in clear_inode so that's
 202                 * OK. */
 203                ocfs2_start_checkpoint(osb);
 204
 205                wait_event(osb->journal->j_checkpointed,
 206                           ocfs2_ci_fully_checkpointed(INODE_CACHE(inode)));
 207        }
 208}
 209
 210/*
 211 *  Transaction Handling:
 212 *  Manage the lifetime of a transaction handle.
 213 *
 214 *  ocfs2_start_trans      - Begin a transaction. Give it an upper estimate of
 215 *                          the number of blocks that will be changed during
 216 *                          this handle.
 217 *  ocfs2_commit_trans - Complete a handle. It might return -EIO if
 218 *                       the journal was aborted. The majority of paths don't
 219 *                       check the return value as an error there comes too
 220 *                       late to do anything (and will be picked up in a
 221 *                       later transaction).
 222 *  ocfs2_extend_trans     - Extend a handle by nblocks credits. This may
 223 *                          commit the handle to disk in the process, but will
 224 *                          not release any locks taken during the transaction.
 225 *  ocfs2_journal_access* - Notify the handle that we want to journal this
 226 *                          buffer. Will have to call ocfs2_journal_dirty once
 227 *                          we've actually dirtied it. Type is one of . or .
 228 *                          Always call the specific flavor of
 229 *                          ocfs2_journal_access_*() unless you intend to
 230 *                          manage the checksum by hand.
 231 *  ocfs2_journal_dirty    - Mark a journalled buffer as having dirty data.
 232 *  ocfs2_jbd2_inode_add_write  - Mark an inode with range so that its data goes
 233 *                                out before the current handle commits.
 234 */
 235
 236/* You must always start_trans with a number of buffs > 0, but it's
 237 * perfectly legal to go through an entire transaction without having
 238 * dirtied any buffers. */
 239handle_t                    *ocfs2_start_trans(struct ocfs2_super *osb,
 240                                               int max_buffs);
 241int                          ocfs2_commit_trans(struct ocfs2_super *osb,
 242                                                handle_t *handle);
 243int                          ocfs2_extend_trans(handle_t *handle, int nblocks);
 244int                          ocfs2_allocate_extend_trans(handle_t *handle,
 245                                                int thresh);
 246
 247/*
 248 * Define an arbitrary limit for the amount of data we will anticipate
 249 * writing to any given transaction.  For unbounded transactions such as
 250 * fallocate(2) we can write more than this, but we always
 251 * start off at the maximum transaction size and grow the transaction
 252 * optimistically as we go.
 253 */
 254#define OCFS2_MAX_TRANS_DATA    64U
 255
 256/*
 257 * Create access is for when we get a newly created buffer and we're
 258 * not gonna read it off disk, but rather fill it ourselves.  Right
 259 * now, we don't do anything special with this (it turns into a write
 260 * request), but this is a good placeholder in case we do...
 261 *
 262 * Write access is for when we read a block off disk and are going to
 263 * modify it. This way the journalling layer knows it may need to make
 264 * a copy of that block (if it's part of another, uncommitted
 265 * transaction) before we do so.
 266 */
 267#define OCFS2_JOURNAL_ACCESS_CREATE 0
 268#define OCFS2_JOURNAL_ACCESS_WRITE  1
 269#define OCFS2_JOURNAL_ACCESS_UNDO   2
 270
 271
 272/* ocfs2_inode */
 273int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci,
 274                            struct buffer_head *bh, int type);
 275/* ocfs2_extent_block */
 276int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci,
 277                            struct buffer_head *bh, int type);
 278/* ocfs2_refcount_block */
 279int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci,
 280                            struct buffer_head *bh, int type);
 281/* ocfs2_group_desc */
 282int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci,
 283                            struct buffer_head *bh, int type);
 284/* ocfs2_xattr_block */
 285int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci,
 286                            struct buffer_head *bh, int type);
 287/* quota blocks */
 288int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci,
 289                            struct buffer_head *bh, int type);
 290/* dirblock */
 291int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci,
 292                            struct buffer_head *bh, int type);
 293/* ocfs2_dx_root_block */
 294int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci,
 295                            struct buffer_head *bh, int type);
 296/* ocfs2_dx_leaf */
 297int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci,
 298                            struct buffer_head *bh, int type);
 299/* Anything that has no ecc */
 300int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci,
 301                         struct buffer_head *bh, int type);
 302
 303/*
 304 * A word about the journal_access/journal_dirty "dance". It is
 305 * entirely legal to journal_access a buffer more than once (as long
 306 * as the access type is the same -- I'm not sure what will happen if
 307 * access type is different but this should never happen anyway) It is
 308 * also legal to journal_dirty a buffer more than once. In fact, you
 309 * can even journal_access a buffer after you've done a
 310 * journal_access/journal_dirty pair. The only thing you cannot do
 311 * however, is journal_dirty a buffer which you haven't yet passed to
 312 * journal_access at least once.
 313 *
 314 * That said, 99% of the time this doesn't matter and this is what the
 315 * path looks like:
 316 *
 317 *      <read a bh>
 318 *      ocfs2_journal_access(handle, bh,        OCFS2_JOURNAL_ACCESS_WRITE);
 319 *      <modify the bh>
 320 *      ocfs2_journal_dirty(handle, bh);
 321 */
 322void ocfs2_journal_dirty(handle_t *handle, struct buffer_head *bh);
 323
 324/*
 325 *  Credit Macros:
 326 *  Convenience macros to calculate number of credits needed.
 327 *
 328 *  For convenience sake, I have a set of macros here which calculate
 329 *  the *maximum* number of sectors which will be changed for various
 330 *  metadata updates.
 331 */
 332
 333/* simple file updates like chmod, etc. */
 334#define OCFS2_INODE_UPDATE_CREDITS 1
 335
 336/* extended attribute block update */
 337#define OCFS2_XATTR_BLOCK_UPDATE_CREDITS 1
 338
 339/* Update of a single quota block */
 340#define OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 1
 341
 342/* global quotafile inode update, data block */
 343#define OCFS2_QINFO_WRITE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \
 344                                   OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
 345
 346#define OCFS2_LOCAL_QINFO_WRITE_CREDITS OCFS2_QUOTA_BLOCK_UPDATE_CREDITS
 347/*
 348 * The two writes below can accidentally see global info dirty due
 349 * to set_info() quotactl so make them prepared for the writes.
 350 */
 351/* quota data block, global info */
 352/* Write to local quota file */
 353#define OCFS2_QWRITE_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
 354                              OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
 355
 356/* global quota data block, local quota data block, global quota inode,
 357 * global quota info */
 358#define OCFS2_QSYNC_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
 359                             2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
 360
 361static inline int ocfs2_quota_trans_credits(struct super_block *sb)
 362{
 363        int credits = 0;
 364
 365        if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA))
 366                credits += OCFS2_QWRITE_CREDITS;
 367        if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA))
 368                credits += OCFS2_QWRITE_CREDITS;
 369        return credits;
 370}
 371
 372/* group extend. inode update and last group update. */
 373#define OCFS2_GROUP_EXTEND_CREDITS      (OCFS2_INODE_UPDATE_CREDITS + 1)
 374
 375/* group add. inode update and the new group update. */
 376#define OCFS2_GROUP_ADD_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
 377
 378/* get one bit out of a suballocator: dinode + group descriptor +
 379 * prev. group desc. if we relink. */
 380#define OCFS2_SUBALLOC_ALLOC (3)
 381
 382static inline int ocfs2_inline_to_extents_credits(struct super_block *sb)
 383{
 384        return OCFS2_SUBALLOC_ALLOC + OCFS2_INODE_UPDATE_CREDITS +
 385               ocfs2_quota_trans_credits(sb);
 386}
 387
 388/* dinode + group descriptor update. We don't relink on free yet. */
 389#define OCFS2_SUBALLOC_FREE  (2)
 390
 391#define OCFS2_TRUNCATE_LOG_UPDATE OCFS2_INODE_UPDATE_CREDITS
 392#define OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC (OCFS2_SUBALLOC_FREE                 \
 393                                         + OCFS2_TRUNCATE_LOG_UPDATE)
 394
 395static inline int ocfs2_remove_extent_credits(struct super_block *sb)
 396{
 397        return OCFS2_TRUNCATE_LOG_UPDATE + OCFS2_INODE_UPDATE_CREDITS +
 398               ocfs2_quota_trans_credits(sb);
 399}
 400
 401/* data block for new dir/symlink, allocation of directory block, dx_root
 402 * update for free list */
 403#define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + OCFS2_SUBALLOC_ALLOC + 1)
 404
 405static inline int ocfs2_add_dir_index_credits(struct super_block *sb)
 406{
 407        /* 1 block for index, 2 allocs (data, metadata), 1 clusters
 408         * worth of blocks for initial extent. */
 409        return 1 + 2 * OCFS2_SUBALLOC_ALLOC +
 410                ocfs2_clusters_to_blocks(sb, 1);
 411}
 412
 413/* parent fe, parent block, new file entry, index leaf, inode alloc fe, inode
 414 * alloc group descriptor + mkdir/symlink blocks + dir blocks + xattr
 415 * blocks + quota update */
 416static inline int ocfs2_mknod_credits(struct super_block *sb, int is_dir,
 417                                      int xattr_credits)
 418{
 419        int dir_credits = OCFS2_DIR_LINK_ADDITIONAL_CREDITS;
 420
 421        if (is_dir)
 422                dir_credits += ocfs2_add_dir_index_credits(sb);
 423
 424        return 4 + OCFS2_SUBALLOC_ALLOC + dir_credits + xattr_credits +
 425               ocfs2_quota_trans_credits(sb);
 426}
 427
 428/* local alloc metadata change + main bitmap updates */
 429#define OCFS2_WINDOW_MOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS                 \
 430                                  + OCFS2_SUBALLOC_ALLOC + OCFS2_SUBALLOC_FREE)
 431
 432/* used when we don't need an allocation change for a dir extend. One
 433 * for the dinode, one for the new block. */
 434#define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2)
 435
 436/* file update (nlink, etc) + directory mtime/ctime + dir entry block + quota
 437 * update on dir + index leaf + dx root update for free list +
 438 * previous dirblock update in the free list */
 439static inline int ocfs2_link_credits(struct super_block *sb)
 440{
 441        return 2 * OCFS2_INODE_UPDATE_CREDITS + 4 +
 442               ocfs2_quota_trans_credits(sb);
 443}
 444
 445/* inode + dir inode (if we unlink a dir), + dir entry block + orphan
 446 * dir inode link + dir inode index leaf + dir index root */
 447static inline int ocfs2_unlink_credits(struct super_block *sb)
 448{
 449        /* The quota update from ocfs2_link_credits is unused here... */
 450        return 2 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_link_credits(sb);
 451}
 452
 453/* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry +
 454 * inode alloc group descriptor + orphan dir index root +
 455 * orphan dir index leaf */
 456#define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 4)
 457
 458/* dinode + orphan dir dinode + extent tree leaf block + orphan dir entry +
 459 * orphan dir index root + orphan dir index leaf */
 460#define OCFS2_INODE_ADD_TO_ORPHAN_CREDITS  (2 * OCFS2_INODE_UPDATE_CREDITS + 4)
 461#define OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS  OCFS2_INODE_ADD_TO_ORPHAN_CREDITS
 462
 463/* dinode update, old dir dinode update, new dir dinode update, old
 464 * dir dir entry, new dir dir entry, dir entry update for renaming
 465 * directory + target unlink + 3 x dir index leaves */
 466static inline int ocfs2_rename_credits(struct super_block *sb)
 467{
 468        return 3 * OCFS2_INODE_UPDATE_CREDITS + 6 + ocfs2_unlink_credits(sb);
 469}
 470
 471/* global bitmap dinode, group desc., relinked group,
 472 * suballocator dinode, group desc., relinked group,
 473 * dinode, xattr block */
 474#define OCFS2_XATTR_BLOCK_CREATE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + \
 475                                          + OCFS2_INODE_UPDATE_CREDITS \
 476                                          + OCFS2_XATTR_BLOCK_UPDATE_CREDITS)
 477
 478/* inode update, removal of dx root block from allocator */
 479#define OCFS2_DX_ROOT_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS +      \
 480                                      OCFS2_SUBALLOC_FREE)
 481
 482static inline int ocfs2_calc_dxi_expand_credits(struct super_block *sb)
 483{
 484        int credits = 1 + OCFS2_SUBALLOC_ALLOC;
 485
 486        credits += ocfs2_clusters_to_blocks(sb, 1);
 487        credits += ocfs2_quota_trans_credits(sb);
 488
 489        return credits;
 490}
 491
 492/* inode update, new refcount block and its allocation credits. */
 493#define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \
 494                                            + OCFS2_SUBALLOC_ALLOC)
 495
 496/* inode and the refcount block update. */
 497#define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
 498
 499/*
 500 * inode and the refcount block update.
 501 * It doesn't include the credits for sub alloc change.
 502 * So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added.
 503 */
 504#define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
 505
 506/* 2 metadata alloc, 2 new blocks and root refcount block */
 507#define OCFS2_EXPAND_REFCOUNT_TREE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + 3)
 508
 509/*
 510 * Please note that the caller must make sure that root_el is the root
 511 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
 512 * the result may be wrong.
 513 */
 514static inline int ocfs2_calc_extend_credits(struct super_block *sb,
 515                                            struct ocfs2_extent_list *root_el)
 516{
 517        int bitmap_blocks, sysfile_bitmap_blocks, extent_blocks;
 518
 519        /* bitmap dinode, group desc. + relinked group. */
 520        bitmap_blocks = OCFS2_SUBALLOC_ALLOC;
 521
 522        /* we might need to shift tree depth so lets assume an
 523         * absolute worst case of complete fragmentation.  Even with
 524         * that, we only need one update for the dinode, and then
 525         * however many metadata chunks needed * a remaining suballoc
 526         * alloc. */
 527        sysfile_bitmap_blocks = 1 +
 528                (OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(root_el);
 529
 530        /* this does not include *new* metadata blocks, which are
 531         * accounted for in sysfile_bitmap_blocks. root_el +
 532         * prev. last_eb_blk + blocks along edge of tree.
 533         * calc_symlink_credits passes because we just need 1
 534         * credit for the dinode there. */
 535        extent_blocks = 1 + 1 + le16_to_cpu(root_el->l_tree_depth);
 536
 537        return bitmap_blocks + sysfile_bitmap_blocks + extent_blocks +
 538               ocfs2_quota_trans_credits(sb);
 539}
 540
 541static inline int ocfs2_calc_symlink_credits(struct super_block *sb)
 542{
 543        int blocks = ocfs2_mknod_credits(sb, 0, 0);
 544
 545        /* links can be longer than one block so we may update many
 546         * within our single allocated extent. */
 547        blocks += ocfs2_clusters_to_blocks(sb, 1);
 548
 549        return blocks + ocfs2_quota_trans_credits(sb);
 550}
 551
 552static inline int ocfs2_calc_group_alloc_credits(struct super_block *sb,
 553                                                 unsigned int cpg)
 554{
 555        int blocks;
 556        int bitmap_blocks = OCFS2_SUBALLOC_ALLOC + 1;
 557        /* parent inode update + new block group header + bitmap inode update
 558           + bitmap blocks affected */
 559        blocks = 1 + 1 + 1 + bitmap_blocks;
 560        return blocks;
 561}
 562
 563/*
 564 * Allocating a discontiguous block group requires the credits from
 565 * ocfs2_calc_group_alloc_credits() as well as enough credits to fill
 566 * the group descriptor's extent list.  The caller already has started
 567 * the transaction with ocfs2_calc_group_alloc_credits().  They extend
 568 * it with these credits.
 569 */
 570static inline int ocfs2_calc_bg_discontig_credits(struct super_block *sb)
 571{
 572        return ocfs2_extent_recs_per_gd(sb);
 573}
 574
 575static inline int ocfs2_jbd2_inode_add_write(handle_t *handle, struct inode *inode,
 576                                             loff_t start_byte, loff_t length)
 577{
 578        return jbd2_journal_inode_ranged_write(handle,
 579                                               &OCFS2_I(inode)->ip_jinode,
 580                                               start_byte, length);
 581}
 582
 583static inline int ocfs2_begin_ordered_truncate(struct inode *inode,
 584                                               loff_t new_size)
 585{
 586        return jbd2_journal_begin_ordered_truncate(
 587                                OCFS2_SB(inode->i_sb)->journal->j_journal,
 588                                &OCFS2_I(inode)->ip_jinode,
 589                                new_size);
 590}
 591
 592static inline void ocfs2_update_inode_fsync_trans(handle_t *handle,
 593                                                  struct inode *inode,
 594                                                  int datasync)
 595{
 596        struct ocfs2_inode_info *oi = OCFS2_I(inode);
 597
 598        if (!is_handle_aborted(handle)) {
 599                oi->i_sync_tid = handle->h_transaction->t_tid;
 600                if (datasync)
 601                        oi->i_datasync_tid = handle->h_transaction->t_tid;
 602        }
 603}
 604
 605#endif /* OCFS2_JOURNAL_H */
 606