fs/reiserfs/journal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Write ahead logging implementation copyright Chris Mason 2000
   4  *
   5  * The background commits make this code very interrelated, and
   6  * overly complex.  I need to rethink things a bit....The major players:
   7  *
   8  * journal_begin -- call with the number of blocks you expect to log.
   9  *                  If the current transaction is too
  10  *                  old, it will block until the current transaction is
  11  *                  finished, and then start a new one.
  12  *                  Usually, your transaction will get joined in with
  13  *                  previous ones for speed.
  14  *
  15  * journal_join  -- same as journal_begin, but won't block on the current
  16  *                  transaction regardless of age.  Don't ever call
  17  *                  this.  Ever.  There are only two places it should be
  18  *                  called from, and they are both inside this file.
  19  *
  20  * journal_mark_dirty -- adds blocks into this transaction.  clears any flags
  21  *                       that might make them get sent to disk
  22  *                       and then marks them BH_JDirty.  Puts the buffer head
  23  *                       into the current transaction hash.
  24  *
  25  * journal_end -- if the current transaction is batchable, it does nothing
  26  *                   otherwise, it could do an async/synchronous commit, or
  27  *                   a full flush of all log and real blocks in the
  28  *                   transaction.
  29  *
  30  * flush_old_commits -- if the current transaction is too old, it is ended and
  31  *                      commit blocks are sent to disk.  Forces commit blocks
  32  *                      to disk for all backgrounded commits that have been
  33  *                      around too long.
  34  *                   -- Note, if you call this as an immediate flush from
  35  *                      from within kupdate, it will ignore the immediate flag
  36  */
  37
  38 #include <linux/time.h>
  39 #include <linux/semaphore.h>
  40 #include <linux/vmalloc.h>
  41 #include "reiserfs.h"
  42 #include <linux/kernel.h>
  43 #include <linux/errno.h>
  44 #include <linux/fcntl.h>
  45 #include <linux/stat.h>
  46 #include <linux/string.h>
  47 #include <linux/buffer_head.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/writeback.h>
  50 #include <linux/blkdev.h>
  51 #include <linux/backing-dev.h>
  52 #include <linux/uaccess.h>
  53 #include <linux/slab.h>
  54
  55
  56 /* gets a struct reiserfs_journal_list * from a list head */
  57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
  58                                j_list))
  59 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
  60                                j_working_list))
  61
  62 /* must be correct to keep the desc and commit structs at 4k */
  63 #define JOURNAL_TRANS_HALF 1018
  64 #define BUFNR 64                /*read ahead */
  65
  66 /* cnode stat bits.  Move these into reiserfs_fs.h */
  67
  68 /* this block was freed, and can't be written.  */
  69 #define BLOCK_FREED 2
  70 /* this block was freed during this transaction, and can't be written */
  71 #define BLOCK_FREED_HOLDER 3
  72
  73 /* used in flush_journal_list */
  74 #define BLOCK_NEEDS_FLUSH 4
  75 #define BLOCK_DIRTIED 5
  76
  77 /* journal list state bits */
  78 #define LIST_TOUCHED 1
  79 #define LIST_DIRTY   2
  80 #define LIST_COMMIT_PENDING  4  /* someone will commit this list */
  81
  82 /* flags for do_journal_end */
  83 #define FLUSH_ALL   1           /* flush commit and real blocks */
  84 #define COMMIT_NOW  2           /* end and commit this transaction */
  85 #define WAIT        4           /* wait for the log blocks to hit the disk */
  86
  87 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
  88 static int flush_journal_list(struct super_block *s,
  89                               struct reiserfs_journal_list *jl, int flushall);
  90 static int flush_commit_list(struct super_block *s,
  91                              struct reiserfs_journal_list *jl, int flushall);
  92 static int can_dirty(struct reiserfs_journal_cnode *cn);
  93 static int journal_join(struct reiserfs_transaction_handle *th,
  94                         struct super_block *sb);
  95 static void release_journal_dev(struct super_block *super,
  96                                struct reiserfs_journal *journal);
  97 static void dirty_one_transaction(struct super_block *s,
  98                                  struct reiserfs_journal_list *jl);
  99 static void flush_async_commits(struct work_struct *work);
 100 static void queue_log_writer(struct super_block *s);
 101
 102 /* values for join in do_journal_begin_r */
 103 enum {
 104         JBEGIN_REG = 0,         /* regular journal begin */
 105         /* join the running transaction if at all possible */
 106         JBEGIN_JOIN = 1,
 107         /* called from cleanup code, ignores aborted flag */
 108         JBEGIN_ABORT = 2,
 109 };
 110
 111 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
 112                               struct super_block *sb,
 113                               unsigned long nblocks, int join);
 114
 115 static void init_journal_hash(struct super_block *sb)
 116 {
 117         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 118         memset(journal->j_hash_table, 0,
 119                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
 120 }
 121
 122 /*
 123  * clears BH_Dirty and sticks the buffer on the clean list.  Called because
 124  * I can't allow refile_buffer to make schedule happen after I've freed a
 125  * block.  Look at remove_from_transaction and journal_mark_freed for
 126  * more details.
 127  */
 128 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
 129 {
 130         if (bh) {
 131                 clear_buffer_dirty(bh);
 132                 clear_buffer_journal_test(bh);
 133         }
 134         return 0;
 135 }
 136
 137 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
 138                                                          *sb)
 139 {
 140         struct reiserfs_bitmap_node *bn;
 141         static int id;
 142
 143         bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
 144         if (!bn) {
 145                 return NULL;
 146         }
 147         bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
 148         if (!bn->data) {
 149                 kfree(bn);
 150                 return NULL;
 151         }
 152         bn->id = id++;
 153         INIT_LIST_HEAD(&bn->list);
 154         return bn;
 155 }
 156
 157 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
 158 {
 159         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 160         struct reiserfs_bitmap_node *bn = NULL;
 161         struct list_head *entry = journal->j_bitmap_nodes.next;
 162
 163         journal->j_used_bitmap_nodes++;
 164 repeat:
 165
 166         if (entry != &journal->j_bitmap_nodes) {
 167                 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
 168                 list_del(entry);
 169                 memset(bn->data, 0, sb->s_blocksize);
 170                 journal->j_free_bitmap_nodes--;
 171                 return bn;
 172         }
 173         bn = allocate_bitmap_node(sb);
 174         if (!bn) {
 175                 yield();
 176                 goto repeat;
 177         }
 178         return bn;
 179 }
 180 static inline void free_bitmap_node(struct super_block *sb,
 181                                     struct reiserfs_bitmap_node *bn)
 182 {
 183         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 184         journal->j_used_bitmap_nodes--;
 185         if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
 186                 kfree(bn->data);
 187                 kfree(bn);
 188         } else {
 189                 list_add(&bn->list, &journal->j_bitmap_nodes);
 190                 journal->j_free_bitmap_nodes++;
 191         }
 192 }
 193
 194 static void allocate_bitmap_nodes(struct super_block *sb)
 195 {
 196         int i;
 197         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 198         struct reiserfs_bitmap_node *bn = NULL;
 199         for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
 200                 bn = allocate_bitmap_node(sb);
 201                 if (bn) {
 202                         list_add(&bn->list, &journal->j_bitmap_nodes);
 203                         journal->j_free_bitmap_nodes++;
 204                 } else {
 205                         /* this is ok, we'll try again when more are needed */
 206                         break;
 207                 }
 208         }
 209 }
 210
 211 static int set_bit_in_list_bitmap(struct super_block *sb,
 212                                   b_blocknr_t block,
 213                                   struct reiserfs_list_bitmap *jb)
 214 {
 215         unsigned int bmap_nr = block / (sb->s_blocksize << 3);
 216         unsigned int bit_nr = block % (sb->s_blocksize << 3);
 217
 218         if (!jb->bitmaps[bmap_nr]) {
 219                 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
 220         }
 221         set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
 222         return 0;
 223 }
 224
 225 static void cleanup_bitmap_list(struct super_block *sb,
 226                                 struct reiserfs_list_bitmap *jb)
 227 {
 228         int i;
 229         if (jb->bitmaps == NULL)
 230                 return;
 231
 232         for (i = 0; i < reiserfs_bmap_count(sb); i++) {
 233                 if (jb->bitmaps[i]) {
 234                         free_bitmap_node(sb, jb->bitmaps[i]);
 235                         jb->bitmaps[i] = NULL;
 236                 }
 237         }
 238 }
 239
 240 /*
 241  * only call this on FS unmount.
 242  */
 243 static int free_list_bitmaps(struct super_block *sb,
 244                              struct reiserfs_list_bitmap *jb_array)
 245 {
 246         int i;
 247         struct reiserfs_list_bitmap *jb;
 248         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 249                 jb = jb_array + i;
 250                 jb->journal_list = NULL;
 251                 cleanup_bitmap_list(sb, jb);
 252                 vfree(jb->bitmaps);
 253                 jb->bitmaps = NULL;
 254         }
 255         return 0;
 256 }
 257
 258 static int free_bitmap_nodes(struct super_block *sb)
 259 {
 260         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 261         struct list_head *next = journal->j_bitmap_nodes.next;
 262         struct reiserfs_bitmap_node *bn;
 263
 264         while (next != &journal->j_bitmap_nodes) {
 265                 bn = list_entry(next, struct reiserfs_bitmap_node, list);
 266                 list_del(next);
 267                 kfree(bn->data);
 268                 kfree(bn);
 269                 next = journal->j_bitmap_nodes.next;
 270                 journal->j_free_bitmap_nodes--;
 271         }
 272
 273         return 0;
 274 }
 275
 276 /*
 277  * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
 278  * jb_array is the array to be filled in.
 279  */
 280 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
 281                                    struct reiserfs_list_bitmap *jb_array,
 282                                    unsigned int bmap_nr)
 283 {
 284         int i;
 285         int failed = 0;
 286         struct reiserfs_list_bitmap *jb;
 287         int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
 288
 289         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 290                 jb = jb_array + i;
 291                 jb->journal_list = NULL;
 292                 jb->bitmaps = vzalloc(mem);
 293                 if (!jb->bitmaps) {
 294                         reiserfs_warning(sb, "clm-2000", "unable to "
 295                                          "allocate bitmaps for journal lists");
 296                         failed = 1;
 297                         break;
 298                 }
 299         }
 300         if (failed) {
 301                 free_list_bitmaps(sb, jb_array);
 302                 return -1;
 303         }
 304         return 0;
 305 }
 306
 307 /*
 308  * find an available list bitmap.  If you can't find one, flush a commit list
 309  * and try again
 310  */
 311 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
 312                                                     struct reiserfs_journal_list
 313                                                     *jl)
 314 {
 315         int i, j;
 316         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 317         struct reiserfs_list_bitmap *jb = NULL;
 318
 319         for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
 320                 i = journal->j_list_bitmap_index;
 321                 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
 322                 jb = journal->j_list_bitmap + i;
 323                 if (journal->j_list_bitmap[i].journal_list) {
 324                         flush_commit_list(sb,
 325                                           journal->j_list_bitmap[i].
 326                                           journal_list, 1);
 327                         if (!journal->j_list_bitmap[i].journal_list) {
 328                                 break;
 329                         }
 330                 } else {
 331                         break;
 332                 }
 333         }
 334         /* double check to make sure if flushed correctly */
 335         if (jb->journal_list)
 336                 return NULL;
 337         jb->journal_list = jl;
 338         return jb;
 339 }
 340
 341 /*
 342  * allocates a new chunk of X nodes, and links them all together as a list.
 343  * Uses the cnode->next and cnode->prev pointers
 344  * returns NULL on failure
 345  */
 346 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
 347 {
 348         struct reiserfs_journal_cnode *head;
 349         int i;
 350         if (num_cnodes <= 0) {
 351                 return NULL;
 352         }
 353         head = vzalloc(array_size(num_cnodes,
 354                                   sizeof(struct reiserfs_journal_cnode)));
 355         if (!head) {
 356                 return NULL;
 357         }
 358         head[0].prev = NULL;
 359         head[0].next = head + 1;
 360         for (i = 1; i < num_cnodes; i++) {
 361                 head[i].prev = head + (i - 1);
 362                 head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
 363         }
 364         head[num_cnodes - 1].next = NULL;
 365         return head;
 366 }
 367
 368 /* pulls a cnode off the free list, or returns NULL on failure */
 369 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
 370 {
 371         struct reiserfs_journal_cnode *cn;
 372         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 373
 374         reiserfs_check_lock_depth(sb, "get_cnode");
 375
 376         if (journal->j_cnode_free <= 0) {
 377                 return NULL;
 378         }
 379         journal->j_cnode_used++;
 380         journal->j_cnode_free--;
 381         cn = journal->j_cnode_free_list;
 382         if (!cn) {
 383                 return cn;
 384         }
 385         if (cn->next) {
 386                 cn->next->prev = NULL;
 387         }
 388         journal->j_cnode_free_list = cn->next;
 389         memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
 390         return cn;
 391 }
 392
 393 /*
 394  * returns a cnode to the free list
 395  */
 396 static void free_cnode(struct super_block *sb,
 397                        struct reiserfs_journal_cnode *cn)
 398 {
 399         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 400
 401         reiserfs_check_lock_depth(sb, "free_cnode");
 402
 403         journal->j_cnode_used--;
 404         journal->j_cnode_free++;
 405         /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
 406         cn->next = journal->j_cnode_free_list;
 407         if (journal->j_cnode_free_list) {
 408                 journal->j_cnode_free_list->prev = cn;
 409         }
 410         cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
 411         journal->j_cnode_free_list = cn;
 412 }
 413
 414 static void clear_prepared_bits(struct buffer_head *bh)
 415 {
 416         clear_buffer_journal_prepared(bh);
 417         clear_buffer_journal_restore_dirty(bh);
 418 }
 419
 420 /*
 421  * return a cnode with same dev, block number and size in table,
 422  * or null if not found
 423  */
 424 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
 425                                                                   super_block
 426                                                                   *sb,
 427                                                                   struct
 428                                                                   reiserfs_journal_cnode
 429                                                                   **table,
 430                                                                   long bl)
 431 {
 432         struct reiserfs_journal_cnode *cn;
 433         cn = journal_hash(table, sb, bl);
 434         while (cn) {
 435                 if (cn->blocknr == bl && cn->sb == sb)
 436                         return cn;
 437                 cn = cn->hnext;
 438         }
 439         return (struct reiserfs_journal_cnode *)0;
 440 }
 441
 442 /*
 443  * this actually means 'can this block be reallocated yet?'.  If you set
 444  * search_all, a block can only be allocated if it is not in the current
 445  * transaction, was not freed by the current transaction, and has no chance
 446  * of ever being overwritten by a replay after crashing.
 447  *
 448  * If you don't set search_all, a block can only be allocated if it is not
 449  * in the current transaction.  Since deleting a block removes it from the
 450  * current transaction, this case should never happen.  If you don't set
 451  * search_all, make sure you never write the block without logging it.
 452  *
 453  * next_zero_bit is a suggestion about the next block to try for find_forward.
 454  * when bl is rejected because it is set in a journal list bitmap, we search
 455  * for the next zero bit in the bitmap that rejected bl.  Then, we return
 456  * that through next_zero_bit for find_forward to try.
 457  *
 458  * Just because we return something in next_zero_bit does not mean we won't
 459  * reject it on the next call to reiserfs_in_journal
 460  */
 461 int reiserfs_in_journal(struct super_block *sb,
 462                         unsigned int bmap_nr, int bit_nr, int search_all,
 463                         b_blocknr_t * next_zero_bit)
 464 {
 465         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 466         struct reiserfs_journal_cnode *cn;
 467         struct reiserfs_list_bitmap *jb;
 468         int i;
 469         unsigned long bl;
 470
 471         *next_zero_bit = 0;     /* always start this at zero. */
 472
 473         PROC_INFO_INC(sb, journal.in_journal);
 474         /*
 475          * If we aren't doing a search_all, this is a metablock, and it
 476          * will be logged before use.  if we crash before the transaction
 477          * that freed it commits,  this transaction won't have committed
 478          * either, and the block will never be written
 479          */
 480         if (search_all) {
 481                 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 482                         PROC_INFO_INC(sb, journal.in_journal_bitmap);
 483                         jb = journal->j_list_bitmap + i;
 484                         if (jb->journal_list && jb->bitmaps[bmap_nr] &&
 485                             test_bit(bit_nr,
 486                                      (unsigned long *)jb->bitmaps[bmap_nr]->
 487                                      data)) {
 488                                 *next_zero_bit =
 489                                     find_next_zero_bit((unsigned long *)
 490                                                        (jb->bitmaps[bmap_nr]->
 491                                                         data),
 492                                                        sb->s_blocksize << 3,
 493                                                        bit_nr + 1);
 494                                 return 1;
 495                         }
 496                 }
 497         }
 498
 499         bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
 500         /* is it in any old transactions? */
 501         if (search_all
 502             && (cn =
 503                 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
 504                 return 1;
 505         }
 506
 507         /* is it in the current transaction.  This should never happen */
 508         if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
 509                 BUG();
 510                 return 1;
 511         }
 512
 513         PROC_INFO_INC(sb, journal.in_journal_reusable);
 514         /* safe for reuse */
 515         return 0;
 516 }
 517
 518 /* insert cn into table */
 519 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
 520                                        struct reiserfs_journal_cnode *cn)
 521 {
 522         struct reiserfs_journal_cnode *cn_orig;
 523
 524         cn_orig = journal_hash(table, cn->sb, cn->blocknr);
 525         cn->hnext = cn_orig;
 526         cn->hprev = NULL;
 527         if (cn_orig) {
 528                 cn_orig->hprev = cn;
 529         }
 530         journal_hash(table, cn->sb, cn->blocknr) = cn;
 531 }
 532
 533 /* lock the current transaction */
 534 static inline void lock_journal(struct super_block *sb)
 535 {
 536         PROC_INFO_INC(sb, journal.lock_journal);
 537
 538         reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
 539 }
 540
 541 /* unlock the current transaction */
 542 static inline void unlock_journal(struct super_block *sb)
 543 {
 544         mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
 545 }
 546
 547 static inline void get_journal_list(struct reiserfs_journal_list *jl)
 548 {
 549         jl->j_refcount++;
 550 }
 551
 552 static inline void put_journal_list(struct super_block *s,
 553                                     struct reiserfs_journal_list *jl)
 554 {
 555         if (jl->j_refcount < 1) {
 556                 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
 557                                jl->j_trans_id, jl->j_refcount);
 558         }
 559         if (--jl->j_refcount == 0)
 560                 kfree(jl);
 561 }
 562
 563 /*
 564  * this used to be much more involved, and I'm keeping it just in case
 565  * things get ugly again.  it gets called by flush_commit_list, and
 566  * cleans up any data stored about blocks freed during a transaction.
 567  */
 568 static void cleanup_freed_for_journal_list(struct super_block *sb,
 569                                            struct reiserfs_journal_list *jl)
 570 {
 571
 572         struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
 573         if (jb) {
 574                 cleanup_bitmap_list(sb, jb);
 575         }
 576         jl->j_list_bitmap->journal_list = NULL;
 577         jl->j_list_bitmap = NULL;
 578 }
 579
 580 static int journal_list_still_alive(struct super_block *s,
 581                                     unsigned int trans_id)
 582 {
 583         struct reiserfs_journal *journal = SB_JOURNAL(s);
 584         struct list_head *entry = &journal->j_journal_list;
 585         struct reiserfs_journal_list *jl;
 586
 587         if (!list_empty(entry)) {
 588                 jl = JOURNAL_LIST_ENTRY(entry->next);
 589                 if (jl->j_trans_id <= trans_id) {
 590                         return 1;
 591                 }
 592         }
 593         return 0;
 594 }
 595
 596 /*
 597  * If page->mapping was null, we failed to truncate this page for
 598  * some reason.  Most likely because it was truncated after being
 599  * logged via data=journal.
 600  *
 601  * This does a check to see if the buffer belongs to one of these
 602  * lost pages before doing the final put_bh.  If page->mapping was
 603  * null, it tries to free buffers on the page, which should make the
 604  * final put_page drop the page from the lru.
 605  */
 606 static void release_buffer_page(struct buffer_head *bh)
 607 {
 608         struct page *page = bh->b_page;
 609         if (!page->mapping && trylock_page(page)) {
 610                 get_page(page);
 611                 put_bh(bh);
 612                 if (!page->mapping)
 613                         try_to_free_buffers(page);
 614                 unlock_page(page);
 615                 put_page(page);
 616         } else {
 617                 put_bh(bh);
 618         }
 619 }
 620
 621 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
 622 {
 623         if (buffer_journaled(bh)) {
 624                 reiserfs_warning(NULL, "clm-2084",
 625                                  "pinned buffer %lu:%pg sent to disk",
 626                                  bh->b_blocknr, bh->b_bdev);
 627         }
 628         if (uptodate)
 629                 set_buffer_uptodate(bh);
 630         else
 631                 clear_buffer_uptodate(bh);
 632
 633         unlock_buffer(bh);
 634         release_buffer_page(bh);
 635 }
 636
 637 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
 638 {
 639         if (uptodate)
 640                 set_buffer_uptodate(bh);
 641         else
 642                 clear_buffer_uptodate(bh);
 643         unlock_buffer(bh);
 644         put_bh(bh);
 645 }
 646
 647 static void submit_logged_buffer(struct buffer_head *bh)
 648 {
 649         get_bh(bh);
 650         bh->b_end_io = reiserfs_end_buffer_io_sync;
 651         clear_buffer_journal_new(bh);
 652         clear_buffer_dirty(bh);
 653         if (!test_clear_buffer_journal_test(bh))
 654                 BUG();
 655         if (!buffer_uptodate(bh))
 656                 BUG();
 657         submit_bh(REQ_OP_WRITE, 0, bh);
 658 }
 659
 660 static void submit_ordered_buffer(struct buffer_head *bh)
 661 {
 662         get_bh(bh);
 663         bh->b_end_io = reiserfs_end_ordered_io;
 664         clear_buffer_dirty(bh);
 665         if (!buffer_uptodate(bh))
 666                 BUG();
 667         submit_bh(REQ_OP_WRITE, 0, bh);
 668 }
 669
 670 #define CHUNK_SIZE 32
 671 struct buffer_chunk {
 672         struct buffer_head *bh[CHUNK_SIZE];
 673         int nr;
 674 };
 675
 676 static void write_chunk(struct buffer_chunk *chunk)
 677 {
 678         int i;
 679         for (i = 0; i < chunk->nr; i++) {
 680                 submit_logged_buffer(chunk->bh[i]);
 681         }
 682         chunk->nr = 0;
 683 }
 684
 685 static void write_ordered_chunk(struct buffer_chunk *chunk)
 686 {
 687         int i;
 688         for (i = 0; i < chunk->nr; i++) {
 689                 submit_ordered_buffer(chunk->bh[i]);
 690         }
 691         chunk->nr = 0;
 692 }
 693
 694 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
 695                         spinlock_t * lock, void (fn) (struct buffer_chunk *))
 696 {
 697         int ret = 0;
 698         BUG_ON(chunk->nr >= CHUNK_SIZE);
 699         chunk->bh[chunk->nr++] = bh;
 700         if (chunk->nr >= CHUNK_SIZE) {
 701                 ret = 1;
 702                 if (lock) {
 703                         spin_unlock(lock);
 704                         fn(chunk);
 705                         spin_lock(lock);
 706                 } else {
 707                         fn(chunk);
 708                 }
 709         }
 710         return ret;
 711 }
 712
 713 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
 714 static struct reiserfs_jh *alloc_jh(void)
 715 {
 716         struct reiserfs_jh *jh;
 717         while (1) {
 718                 jh = kmalloc(sizeof(*jh), GFP_NOFS);
 719                 if (jh) {
 720                         atomic_inc(&nr_reiserfs_jh);
 721                         return jh;
 722                 }
 723                 yield();
 724         }
 725 }
 726
 727 /*
 728  * we want to free the jh when the buffer has been written
 729  * and waited on
 730  */
 731 void reiserfs_free_jh(struct buffer_head *bh)
 732 {
 733         struct reiserfs_jh *jh;
 734
 735         jh = bh->b_private;
 736         if (jh) {
 737                 bh->b_private = NULL;
 738                 jh->bh = NULL;
 739                 list_del_init(&jh->list);
 740                 kfree(jh);
 741                 if (atomic_read(&nr_reiserfs_jh) <= 0)
 742                         BUG();
 743                 atomic_dec(&nr_reiserfs_jh);
 744                 put_bh(bh);
 745         }
 746 }
 747
 748 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
 749                            int tail)
 750 {
 751         struct reiserfs_jh *jh;
 752
 753         if (bh->b_private) {
 754                 spin_lock(&j->j_dirty_buffers_lock);
 755                 if (!bh->b_private) {
 756                         spin_unlock(&j->j_dirty_buffers_lock);
 757                         goto no_jh;
 758                 }
 759                 jh = bh->b_private;
 760                 list_del_init(&jh->list);
 761         } else {
 762 no_jh:
 763                 get_bh(bh);
 764                 jh = alloc_jh();
 765                 spin_lock(&j->j_dirty_buffers_lock);
 766                 /*
 767                  * buffer must be locked for __add_jh, should be able to have
 768                  * two adds at the same time
 769                  */
 770                 BUG_ON(bh->b_private);
 771                 jh->bh = bh;
 772                 bh->b_private = jh;
 773         }
 774         jh->jl = j->j_current_jl;
 775         if (tail)
 776                 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
 777         else {
 778                 list_add_tail(&jh->list, &jh->jl->j_bh_list);
 779         }
 780         spin_unlock(&j->j_dirty_buffers_lock);
 781         return 0;
 782 }
 783
 784 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
 785 {
 786         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
 787 }
 788 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
 789 {
 790         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
 791 }
 792
 793 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
 794 static int write_ordered_buffers(spinlock_t * lock,
 795                                  struct reiserfs_journal *j,
 796                                  struct reiserfs_journal_list *jl,
 797                                  struct list_head *list)
 798 {
 799         struct buffer_head *bh;
 800         struct reiserfs_jh *jh;
 801         int ret = j->j_errno;
 802         struct buffer_chunk chunk;
 803         struct list_head tmp;
 804         INIT_LIST_HEAD(&tmp);
 805
 806         chunk.nr = 0;
 807         spin_lock(lock);
 808         while (!list_empty(list)) {
 809                 jh = JH_ENTRY(list->next);
 810                 bh = jh->bh;
 811                 get_bh(bh);
 812                 if (!trylock_buffer(bh)) {
 813                         if (!buffer_dirty(bh)) {
 814                                 list_move(&jh->list, &tmp);
 815                                 goto loop_next;
 816                         }
 817                         spin_unlock(lock);
 818                         if (chunk.nr)
 819                                 write_ordered_chunk(&chunk);
 820                         wait_on_buffer(bh);
 821                         cond_resched();
 822                         spin_lock(lock);
 823                         goto loop_next;
 824                 }
 825                 /*
 826                  * in theory, dirty non-uptodate buffers should never get here,
 827                  * but the upper layer io error paths still have a few quirks.
 828                  * Handle them here as gracefully as we can
 829                  */
 830                 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
 831                         clear_buffer_dirty(bh);
 832                         ret = -EIO;
 833                 }
 834                 if (buffer_dirty(bh)) {
 835                         list_move(&jh->list, &tmp);
 836                         add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
 837                 } else {
 838                         reiserfs_free_jh(bh);
 839                         unlock_buffer(bh);
 840                 }
 841 loop_next:
 842                 put_bh(bh);
 843                 cond_resched_lock(lock);
 844         }
 845         if (chunk.nr) {
 846                 spin_unlock(lock);
 847                 write_ordered_chunk(&chunk);
 848                 spin_lock(lock);
 849         }
 850         while (!list_empty(&tmp)) {
 851                 jh = JH_ENTRY(tmp.prev);
 852                 bh = jh->bh;
 853                 get_bh(bh);
 854                 reiserfs_free_jh(bh);
 855
 856                 if (buffer_locked(bh)) {
 857                         spin_unlock(lock);
 858                         wait_on_buffer(bh);
 859                         spin_lock(lock);
 860                 }
 861                 if (!buffer_uptodate(bh)) {
 862                         ret = -EIO;
 863                 }
 864                 /*
 865                  * ugly interaction with invalidatepage here.
 866                  * reiserfs_invalidate_page will pin any buffer that has a
 867                  * valid journal head from an older transaction.  If someone
 868                  * else sets our buffer dirty after we write it in the first
 869                  * loop, and then someone truncates the page away, nobody
 870                  * will ever write the buffer. We're safe if we write the
 871                  * page one last time after freeing the journal header.
 872                  */
 873                 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
 874                         spin_unlock(lock);
 875                         ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
 876                         spin_lock(lock);
 877                 }
 878                 put_bh(bh);
 879                 cond_resched_lock(lock);
 880         }
 881         spin_unlock(lock);
 882         return ret;
 883 }
 884
 885 static int flush_older_commits(struct super_block *s,
 886                                struct reiserfs_journal_list *jl)
 887 {
 888         struct reiserfs_journal *journal = SB_JOURNAL(s);
 889         struct reiserfs_journal_list *other_jl;
 890         struct reiserfs_journal_list *first_jl;
 891         struct list_head *entry;
 892         unsigned int trans_id = jl->j_trans_id;
 893         unsigned int other_trans_id;
 894
 895 find_first:
 896         /*
 897          * first we walk backwards to find the oldest uncommitted transation
 898          */
 899         first_jl = jl;
 900         entry = jl->j_list.prev;
 901         while (1) {
 902                 other_jl = JOURNAL_LIST_ENTRY(entry);
 903                 if (entry == &journal->j_journal_list ||
 904                     atomic_read(&other_jl->j_older_commits_done))
 905                         break;
 906
 907                 first_jl = other_jl;
 908                 entry = other_jl->j_list.prev;
 909         }
 910
 911         /* if we didn't find any older uncommitted transactions, return now */
 912         if (first_jl == jl) {
 913                 return 0;
 914         }
 915
 916         entry = &first_jl->j_list;
 917         while (1) {
 918                 other_jl = JOURNAL_LIST_ENTRY(entry);
 919                 other_trans_id = other_jl->j_trans_id;
 920
 921                 if (other_trans_id < trans_id) {
 922                         if (atomic_read(&other_jl->j_commit_left) != 0) {
 923                                 flush_commit_list(s, other_jl, 0);
 924
 925                                 /* list we were called with is gone, return */
 926                                 if (!journal_list_still_alive(s, trans_id))
 927                                         return 1;
 928
 929                                 /*
 930                                  * the one we just flushed is gone, this means
 931                                  * all older lists are also gone, so first_jl
 932                                  * is no longer valid either.  Go back to the
 933                                  * beginning.
 934                                  */
 935                                 if (!journal_list_still_alive
 936                                     (s, other_trans_id)) {
 937                                         goto find_first;
 938                                 }
 939                         }
 940                         entry = entry->next;
 941                         if (entry == &journal->j_journal_list)
 942                                 return 0;
 943                 } else {
 944                         return 0;
 945                 }
 946         }
 947         return 0;
 948 }
 949
 950 static int reiserfs_async_progress_wait(struct super_block *s)
 951 {
 952         struct reiserfs_journal *j = SB_JOURNAL(s);
 953
 954         if (atomic_read(&j->j_async_throttle)) {
 955                 int depth;
 956
 957                 depth = reiserfs_write_unlock_nested(s);
 958                 congestion_wait(BLK_RW_ASYNC, HZ / 10);
 959                 reiserfs_write_lock_nested(s, depth);
 960         }
 961
 962         return 0;
 963 }
 964
 965 /*
 966  * if this journal list still has commit blocks unflushed, send them to disk.
 967  *
 968  * log areas must be flushed in order (transaction 2 can't commit before
 969  * transaction 1) Before the commit block can by written, every other log
 970  * block must be safely on disk
 971  */
 972 static int flush_commit_list(struct super_block *s,
 973                              struct reiserfs_journal_list *jl, int flushall)
 974 {
 975         int i;
 976         b_blocknr_t bn;
 977         struct buffer_head *tbh = NULL;
 978         unsigned int trans_id = jl->j_trans_id;
 979         struct reiserfs_journal *journal = SB_JOURNAL(s);
 980         int retval = 0;
 981         int write_len;
 982         int depth;
 983
 984         reiserfs_check_lock_depth(s, "flush_commit_list");
 985
 986         if (atomic_read(&jl->j_older_commits_done)) {
 987                 return 0;
 988         }
 989
 990         /*
 991          * before we can put our commit blocks on disk, we have to make
 992          * sure everyone older than us is on disk too
 993          */
 994         BUG_ON(jl->j_len <= 0);
 995         BUG_ON(trans_id == journal->j_trans_id);
 996
 997         get_journal_list(jl);
 998         if (flushall) {
 999                 if (flush_older_commits(s, jl) == 1) {
1000                         /*
1001                          * list disappeared during flush_older_commits.
1002                          * return
1003                          */
1004                         goto put_jl;
1005                 }
1006         }
1007
1008         /* make sure nobody is trying to flush this one at the same time */
1009         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1010
1011         if (!journal_list_still_alive(s, trans_id)) {
1012                 mutex_unlock(&jl->j_commit_mutex);
1013                 goto put_jl;
1014         }
1015         BUG_ON(jl->j_trans_id == 0);
1016
1017         /* this commit is done, exit */
1018         if (atomic_read(&jl->j_commit_left) <= 0) {
1019                 if (flushall) {
1020                         atomic_set(&jl->j_older_commits_done, 1);
1021                 }
1022                 mutex_unlock(&jl->j_commit_mutex);
1023                 goto put_jl;
1024         }
1025
1026         if (!list_empty(&jl->j_bh_list)) {
1027                 int ret;
1028
1029                 /*
1030                  * We might sleep in numerous places inside
1031                  * write_ordered_buffers. Relax the write lock.
1032                  */
1033                 depth = reiserfs_write_unlock_nested(s);
1034                 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1035                                             journal, jl, &jl->j_bh_list);
1036                 if (ret < 0 && retval == 0)
1037                         retval = ret;
1038                 reiserfs_write_lock_nested(s, depth);
1039         }
1040         BUG_ON(!list_empty(&jl->j_bh_list));
1041         /*
1042          * for the description block and all the log blocks, submit any buffers
1043          * that haven't already reached the disk.  Try to write at least 256
1044          * log blocks. later on, we will only wait on blocks that correspond
1045          * to this transaction, but while we're unplugging we might as well
1046          * get a chunk of data on there.
1047          */
1048         atomic_inc(&journal->j_async_throttle);
1049         write_len = jl->j_len + 1;
1050         if (write_len < 256)
1051                 write_len = 256;
1052         for (i = 0 ; i < write_len ; i++) {
1053                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1054                     SB_ONDISK_JOURNAL_SIZE(s);
1055                 tbh = journal_find_get_block(s, bn);
1056                 if (tbh) {
1057                         if (buffer_dirty(tbh)) {
1058                             depth = reiserfs_write_unlock_nested(s);
1059                             ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1060                             reiserfs_write_lock_nested(s, depth);
1061                         }
1062                         put_bh(tbh) ;
1063                 }
1064         }
1065         atomic_dec(&journal->j_async_throttle);
1066
1067         for (i = 0; i < (jl->j_len + 1); i++) {
1068                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1069                     (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1070                 tbh = journal_find_get_block(s, bn);
1071
1072                 depth = reiserfs_write_unlock_nested(s);
1073                 __wait_on_buffer(tbh);
1074                 reiserfs_write_lock_nested(s, depth);
1075                 /*
1076                  * since we're using ll_rw_blk above, it might have skipped
1077                  * over a locked buffer.  Double check here
1078                  */
1079                 /* redundant, sync_dirty_buffer() checks */
1080                 if (buffer_dirty(tbh)) {
1081                         depth = reiserfs_write_unlock_nested(s);
1082                         sync_dirty_buffer(tbh);
1083                         reiserfs_write_lock_nested(s, depth);
1084                 }
1085                 if (unlikely(!buffer_uptodate(tbh))) {
1086 #ifdef CONFIG_REISERFS_CHECK
1087                         reiserfs_warning(s, "journal-601",
1088                                          "buffer write failed");
1089 #endif
1090                         retval = -EIO;
1091                 }
1092                 /* once for journal_find_get_block */
1093                 put_bh(tbh);
1094                 /* once due to original getblk in do_journal_end */
1095                 put_bh(tbh);
1096                 atomic_dec(&jl->j_commit_left);
1097         }
1098
1099         BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1100
1101         /*
1102          * If there was a write error in the journal - we can't commit
1103          * this transaction - it will be invalid and, if successful,
1104          * will just end up propagating the write error out to
1105          * the file system.
1106          */
1107         if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1108                 if (buffer_dirty(jl->j_commit_bh))
1109                         BUG();
1110                 mark_buffer_dirty(jl->j_commit_bh) ;
1111                 depth = reiserfs_write_unlock_nested(s);
1112                 if (reiserfs_barrier_flush(s))
1113                         __sync_dirty_buffer(jl->j_commit_bh,
1114                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1115                 else
1116                         sync_dirty_buffer(jl->j_commit_bh);
1117                 reiserfs_write_lock_nested(s, depth);
1118         }
1119
1120         /*
1121          * If there was a write error in the journal - we can't commit this
1122          * transaction - it will be invalid and, if successful, will just end
1123          * up propagating the write error out to the filesystem.
1124          */
1125         if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1126 #ifdef CONFIG_REISERFS_CHECK
1127                 reiserfs_warning(s, "journal-615", "buffer write failed");
1128 #endif
1129                 retval = -EIO;
1130         }
1131         bforget(jl->j_commit_bh);
1132         if (journal->j_last_commit_id != 0 &&
1133             (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1134                 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1135                                  journal->j_last_commit_id, jl->j_trans_id);
1136         }
1137         journal->j_last_commit_id = jl->j_trans_id;
1138
1139         /*
1140          * now, every commit block is on the disk.  It is safe to allow
1141          * blocks freed during this transaction to be reallocated
1142          */
1143         cleanup_freed_for_journal_list(s, jl);
1144
1145         retval = retval ? retval : journal->j_errno;
1146
1147         /* mark the metadata dirty */
1148         if (!retval)
1149                 dirty_one_transaction(s, jl);
1150         atomic_dec(&jl->j_commit_left);
1151
1152         if (flushall) {
1153                 atomic_set(&jl->j_older_commits_done, 1);
1154         }
1155         mutex_unlock(&jl->j_commit_mutex);
1156 put_jl:
1157         put_journal_list(s, jl);
1158
1159         if (retval)
1160                 reiserfs_abort(s, retval, "Journal write error in %s",
1161                                __func__);
1162         return retval;
1163 }
1164
1165 /*
1166  * flush_journal_list frequently needs to find a newer transaction for a
1167  * given block.  This does that, or returns NULL if it can't find anything
1168  */
1169 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1170                                                           reiserfs_journal_cnode
1171                                                           *cn)
1172 {
1173         struct super_block *sb = cn->sb;
1174         b_blocknr_t blocknr = cn->blocknr;
1175
1176         cn = cn->hprev;
1177         while (cn) {
1178                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1179                         return cn->jlist;
1180                 }
1181                 cn = cn->hprev;
1182         }
1183         return NULL;
1184 }
1185
1186 static void remove_journal_hash(struct super_block *,
1187                                 struct reiserfs_journal_cnode **,
1188                                 struct reiserfs_journal_list *, unsigned long,
1189                                 int);
1190
1191 /*
1192  * once all the real blocks have been flushed, it is safe to remove them
1193  * from the journal list for this transaction.  Aside from freeing the
1194  * cnode, this also allows the block to be reallocated for data blocks
1195  * if it had been deleted.
1196  */
1197 static void remove_all_from_journal_list(struct super_block *sb,
1198                                          struct reiserfs_journal_list *jl,
1199                                          int debug)
1200 {
1201         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1202         struct reiserfs_journal_cnode *cn, *last;
1203         cn = jl->j_realblock;
1204
1205         /*
1206          * which is better, to lock once around the whole loop, or
1207          * to lock for each call to remove_journal_hash?
1208          */
1209         while (cn) {
1210                 if (cn->blocknr != 0) {
1211                         if (debug) {
1212                                 reiserfs_warning(sb, "reiserfs-2201",
1213                                                  "block %u, bh is %d, state %ld",
1214                                                  cn->blocknr, cn->bh ? 1 : 0,
1215                                                  cn->state);
1216                         }
1217                         cn->state = 0;
1218                         remove_journal_hash(sb, journal->j_list_hash_table,
1219                                             jl, cn->blocknr, 1);
1220                 }
1221                 last = cn;
1222                 cn = cn->next;
1223                 free_cnode(sb, last);
1224         }
1225         jl->j_realblock = NULL;
1226 }
1227
1228 /*
1229  * if this timestamp is greater than the timestamp we wrote last to the
1230  * header block, write it to the header block.  once this is done, I can
1231  * safely say the log area for this transaction won't ever be replayed,
1232  * and I can start releasing blocks in this transaction for reuse as data
1233  * blocks.  called by flush_journal_list, before it calls
1234  * remove_all_from_journal_list
1235  */
1236 static int _update_journal_header_block(struct super_block *sb,
1237                                         unsigned long offset,
1238                                         unsigned int trans_id)
1239 {
1240         struct reiserfs_journal_header *jh;
1241         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1242         int depth;
1243
1244         if (reiserfs_is_journal_aborted(journal))
1245                 return -EIO;
1246
1247         if (trans_id >= journal->j_last_flush_trans_id) {
1248                 if (buffer_locked((journal->j_header_bh))) {
1249                         depth = reiserfs_write_unlock_nested(sb);
1250                         __wait_on_buffer(journal->j_header_bh);
1251                         reiserfs_write_lock_nested(sb, depth);
1252                         if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1253 #ifdef CONFIG_REISERFS_CHECK
1254                                 reiserfs_warning(sb, "journal-699",
1255                                                  "buffer write failed");
1256 #endif
1257                                 return -EIO;
1258                         }
1259                 }
1260                 journal->j_last_flush_trans_id = trans_id;
1261                 journal->j_first_unflushed_offset = offset;
1262                 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1263                                                         b_data);
1264                 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1265                 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1266                 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1267
1268                 set_buffer_dirty(journal->j_header_bh);
1269                 depth = reiserfs_write_unlock_nested(sb);
1270
1271                 if (reiserfs_barrier_flush(sb))
1272                         __sync_dirty_buffer(journal->j_header_bh,
1273                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1274                 else
1275                         sync_dirty_buffer(journal->j_header_bh);
1276
1277                 reiserfs_write_lock_nested(sb, depth);
1278                 if (!buffer_uptodate(journal->j_header_bh)) {
1279                         reiserfs_warning(sb, "journal-837",
1280                                          "IO error during journal replay");
1281                         return -EIO;
1282                 }
1283         }
1284         return 0;
1285 }
1286
1287 static int update_journal_header_block(struct super_block *sb,
1288                                        unsigned long offset,
1289                                        unsigned int trans_id)
1290 {
1291         return _update_journal_header_block(sb, offset, trans_id);
1292 }
1293
1294 /*
1295 ** flush any and all journal lists older than you are
1296 ** can only be called from flush_journal_list
1297 */
1298 static int flush_older_journal_lists(struct super_block *sb,
1299                                      struct reiserfs_journal_list *jl)
1300 {
1301         struct list_head *entry;
1302         struct reiserfs_journal_list *other_jl;
1303         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1304         unsigned int trans_id = jl->j_trans_id;
1305
1306         /*
1307          * we know we are the only ones flushing things, no extra race
1308          * protection is required.
1309          */
1310 restart:
1311         entry = journal->j_journal_list.next;
1312         /* Did we wrap? */
1313         if (entry == &journal->j_journal_list)
1314                 return 0;
1315         other_jl = JOURNAL_LIST_ENTRY(entry);
1316         if (other_jl->j_trans_id < trans_id) {
1317                 BUG_ON(other_jl->j_refcount <= 0);
1318                 /* do not flush all */
1319                 flush_journal_list(sb, other_jl, 0);
1320
1321                 /* other_jl is now deleted from the list */
1322                 goto restart;
1323         }
1324         return 0;
1325 }
1326
1327 static void del_from_work_list(struct super_block *s,
1328                                struct reiserfs_journal_list *jl)
1329 {
1330         struct reiserfs_journal *journal = SB_JOURNAL(s);
1331         if (!list_empty(&jl->j_working_list)) {
1332                 list_del_init(&jl->j_working_list);
1333                 journal->j_num_work_lists--;
1334         }
1335 }
1336
1337 /*
1338  * flush a journal list, both commit and real blocks
1339  *
1340  * always set flushall to 1, unless you are calling from inside
1341  * flush_journal_list
1342  *
1343  * IMPORTANT.  This can only be called while there are no journal writers,
1344  * and the journal is locked.  That means it can only be called from
1345  * do_journal_end, or by journal_release
1346  */
1347 static int flush_journal_list(struct super_block *s,
1348                               struct reiserfs_journal_list *jl, int flushall)
1349 {
1350         struct reiserfs_journal_list *pjl;
1351         struct reiserfs_journal_cnode *cn;
1352         int count;
1353         int was_jwait = 0;
1354         int was_dirty = 0;
1355         struct buffer_head *saved_bh;
1356         unsigned long j_len_saved = jl->j_len;
1357         struct reiserfs_journal *journal = SB_JOURNAL(s);
1358         int err = 0;
1359         int depth;
1360
1361         BUG_ON(j_len_saved <= 0);
1362
1363         if (atomic_read(&journal->j_wcount) != 0) {
1364                 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1365                                  atomic_read(&journal->j_wcount));
1366         }
1367
1368         /* if flushall == 0, the lock is already held */
1369         if (flushall) {
1370                 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1371         } else if (mutex_trylock(&journal->j_flush_mutex)) {
1372                 BUG();
1373         }
1374
1375         count = 0;
1376         if (j_len_saved > journal->j_trans_max) {
1377                 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1378                                j_len_saved, jl->j_trans_id);
1379                 return 0;
1380         }
1381
1382         /* if all the work is already done, get out of here */
1383         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1384             atomic_read(&jl->j_commit_left) <= 0) {
1385                 goto flush_older_and_return;
1386         }
1387
1388         /*
1389          * start by putting the commit list on disk.  This will also flush
1390          * the commit lists of any olders transactions
1391          */
1392         flush_commit_list(s, jl, 1);
1393
1394         if (!(jl->j_state & LIST_DIRTY)
1395             && !reiserfs_is_journal_aborted(journal))
1396                 BUG();
1397
1398         /* are we done now? */
1399         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1400             atomic_read(&jl->j_commit_left) <= 0) {
1401                 goto flush_older_and_return;
1402         }
1403
1404         /*
1405          * loop through each cnode, see if we need to write it,
1406          * or wait on a more recent transaction, or just ignore it
1407          */
1408         if (atomic_read(&journal->j_wcount) != 0) {
1409                 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1410                                "wcount is not 0");
1411         }
1412         cn = jl->j_realblock;
1413         while (cn) {
1414                 was_jwait = 0;
1415                 was_dirty = 0;
1416                 saved_bh = NULL;
1417                 /* blocknr of 0 is no longer in the hash, ignore it */
1418                 if (cn->blocknr == 0) {
1419                         goto free_cnode;
1420                 }
1421
1422                 /*
1423                  * This transaction failed commit.
1424                  * Don't write out to the disk
1425                  */
1426                 if (!(jl->j_state & LIST_DIRTY))
1427                         goto free_cnode;
1428
1429                 pjl = find_newer_jl_for_cn(cn);
1430                 /*
1431                  * the order is important here.  We check pjl to make sure we
1432                  * don't clear BH_JDirty_wait if we aren't the one writing this
1433                  * block to disk
1434                  */
1435                 if (!pjl && cn->bh) {
1436                         saved_bh = cn->bh;
1437
1438                         /*
1439                          * we do this to make sure nobody releases the
1440                          * buffer while we are working with it
1441                          */
1442                         get_bh(saved_bh);
1443
1444                         if (buffer_journal_dirty(saved_bh)) {
1445                                 BUG_ON(!can_dirty(cn));
1446                                 was_jwait = 1;
1447                                 was_dirty = 1;
1448                         } else if (can_dirty(cn)) {
1449                                 /*
1450                                  * everything with !pjl && jwait
1451                                  * should be writable
1452                                  */
1453                                 BUG();
1454                         }
1455                 }
1456
1457                 /*
1458                  * if someone has this block in a newer transaction, just make
1459                  * sure they are committed, and don't try writing it to disk
1460                  */
1461                 if (pjl) {
1462                         if (atomic_read(&pjl->j_commit_left))
1463                                 flush_commit_list(s, pjl, 1);
1464                         goto free_cnode;
1465                 }
1466
1467                 /*
1468                  * bh == NULL when the block got to disk on its own, OR,
1469                  * the block got freed in a future transaction
1470                  */
1471                 if (saved_bh == NULL) {
1472                         goto free_cnode;
1473                 }
1474
1475                 /*
1476                  * this should never happen.  kupdate_one_transaction has
1477                  * this list locked while it works, so we should never see a
1478                  * buffer here that is not marked JDirty_wait
1479                  */
1480                 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1481                         reiserfs_warning(s, "journal-813",
1482                                          "BAD! buffer %llu %cdirty %cjwait, "
1483                                          "not in a newer transaction",
1484                                          (unsigned long long)saved_bh->
1485                                          b_blocknr, was_dirty ? ' ' : '!',
1486                                          was_jwait ? ' ' : '!');
1487                 }
1488                 if (was_dirty) {
1489                         /*
1490                          * we inc again because saved_bh gets decremented
1491                          * at free_cnode
1492                          */
1493                         get_bh(saved_bh);
1494                         set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1495                         lock_buffer(saved_bh);
1496                         BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1497                         if (buffer_dirty(saved_bh))
1498                                 submit_logged_buffer(saved_bh);
1499                         else
1500                                 unlock_buffer(saved_bh);
1501                         count++;
1502                 } else {
1503                         reiserfs_warning(s, "clm-2082",
1504                                          "Unable to flush buffer %llu in %s",
1505                                          (unsigned long long)saved_bh->
1506                                          b_blocknr, __func__);
1507                 }
1508 free_cnode:
1509                 cn = cn->next;
1510                 if (saved_bh) {
1511                         /*
1512                          * we incremented this to keep others from
1513                          * taking the buffer head away
1514                          */
1515                         put_bh(saved_bh);
1516                         if (atomic_read(&saved_bh->b_count) < 0) {
1517                                 reiserfs_warning(s, "journal-945",
1518                                                  "saved_bh->b_count < 0");
1519                         }
1520                 }
1521         }
1522         if (count > 0) {
1523                 cn = jl->j_realblock;
1524                 while (cn) {
1525                         if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1526                                 if (!cn->bh) {
1527                                         reiserfs_panic(s, "journal-1011",
1528                                                        "cn->bh is NULL");
1529                                 }
1530
1531                                 depth = reiserfs_write_unlock_nested(s);
1532                                 __wait_on_buffer(cn->bh);
1533                                 reiserfs_write_lock_nested(s, depth);
1534
1535                                 if (!cn->bh) {
1536                                         reiserfs_panic(s, "journal-1012",
1537                                                        "cn->bh is NULL");
1538                                 }
1539                                 if (unlikely(!buffer_uptodate(cn->bh))) {
1540 #ifdef CONFIG_REISERFS_CHECK
1541                                         reiserfs_warning(s, "journal-949",
1542                                                          "buffer write failed");
1543 #endif
1544                                         err = -EIO;
1545                                 }
1546                                 /*
1547                                  * note, we must clear the JDirty_wait bit
1548                                  * after the up to date check, otherwise we
1549                                  * race against our flushpage routine
1550                                  */
1551                                 BUG_ON(!test_clear_buffer_journal_dirty
1552                                        (cn->bh));
1553
1554                                 /* drop one ref for us */
1555                                 put_bh(cn->bh);
1556                                 /* drop one ref for journal_mark_dirty */
1557                                 release_buffer_page(cn->bh);
1558                         }
1559                         cn = cn->next;
1560                 }
1561         }
1562
1563         if (err)
1564                 reiserfs_abort(s, -EIO,
1565                                "Write error while pushing transaction to disk in %s",
1566                                __func__);
1567 flush_older_and_return:
1568
1569         /*
1570          * before we can update the journal header block, we _must_ flush all
1571          * real blocks from all older transactions to disk.  This is because
1572          * once the header block is updated, this transaction will not be
1573          * replayed after a crash
1574          */
1575         if (flushall) {
1576                 flush_older_journal_lists(s, jl);
1577         }
1578
1579         err = journal->j_errno;
1580         /*
1581          * before we can remove everything from the hash tables for this
1582          * transaction, we must make sure it can never be replayed
1583          *
1584          * since we are only called from do_journal_end, we know for sure there
1585          * are no allocations going on while we are flushing journal lists.  So,
1586          * we only need to update the journal header block for the last list
1587          * being flushed
1588          */
1589         if (!err && flushall) {
1590                 err =
1591                     update_journal_header_block(s,
1592                                                 (jl->j_start + jl->j_len +
1593                                                  2) % SB_ONDISK_JOURNAL_SIZE(s),
1594                                                 jl->j_trans_id);
1595                 if (err)
1596                         reiserfs_abort(s, -EIO,
1597                                        "Write error while updating journal header in %s",
1598                                        __func__);
1599         }
1600         remove_all_from_journal_list(s, jl, 0);
1601         list_del_init(&jl->j_list);
1602         journal->j_num_lists--;
1603         del_from_work_list(s, jl);
1604
1605         if (journal->j_last_flush_id != 0 &&
1606             (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1607                 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1608                                  journal->j_last_flush_id, jl->j_trans_id);
1609         }
1610         journal->j_last_flush_id = jl->j_trans_id;
1611
1612         /*
1613          * not strictly required since we are freeing the list, but it should
1614          * help find code using dead lists later on
1615          */
1616         jl->j_len = 0;
1617         atomic_set(&jl->j_nonzerolen, 0);
1618         jl->j_start = 0;
1619         jl->j_realblock = NULL;
1620         jl->j_commit_bh = NULL;
1621         jl->j_trans_id = 0;
1622         jl->j_state = 0;
1623         put_journal_list(s, jl);
1624         if (flushall)
1625                 mutex_unlock(&journal->j_flush_mutex);
1626         return err;
1627 }
1628
1629 static int write_one_transaction(struct super_block *s,
1630                                  struct reiserfs_journal_list *jl,
1631                                  struct buffer_chunk *chunk)
1632 {
1633         struct reiserfs_journal_cnode *cn;
1634         int ret = 0;
1635
1636         jl->j_state |= LIST_TOUCHED;
1637         del_from_work_list(s, jl);
1638         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1639                 return 0;
1640         }
1641
1642         cn = jl->j_realblock;
1643         while (cn) {
1644                 /*
1645                  * if the blocknr == 0, this has been cleared from the hash,
1646                  * skip it
1647                  */
1648                 if (cn->blocknr == 0) {
1649                         goto next;
1650                 }
1651                 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1652                         struct buffer_head *tmp_bh;
1653                         /*
1654                          * we can race against journal_mark_freed when we try
1655                          * to lock_buffer(cn->bh), so we have to inc the buffer
1656                          * count, and recheck things after locking
1657                          */
1658                         tmp_bh = cn->bh;
1659                         get_bh(tmp_bh);
1660                         lock_buffer(tmp_bh);
1661                         if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1662                                 if (!buffer_journal_dirty(tmp_bh) ||
1663                                     buffer_journal_prepared(tmp_bh))
1664                                         BUG();
1665                                 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1666                                 ret++;
1667                         } else {
1668                                 /* note, cn->bh might be null now */
1669                                 unlock_buffer(tmp_bh);
1670                         }
1671                         put_bh(tmp_bh);
1672                 }
1673 next:
1674                 cn = cn->next;
1675                 cond_resched();
1676         }
1677         return ret;
1678 }
1679
1680 /* used by flush_commit_list */
1681 static void dirty_one_transaction(struct super_block *s,
1682                                  struct reiserfs_journal_list *jl)
1683 {
1684         struct reiserfs_journal_cnode *cn;
1685         struct reiserfs_journal_list *pjl;
1686
1687         jl->j_state |= LIST_DIRTY;
1688         cn = jl->j_realblock;
1689         while (cn) {
1690                 /*
1691                  * look for a more recent transaction that logged this
1692                  * buffer.  Only the most recent transaction with a buffer in
1693                  * it is allowed to send that buffer to disk
1694                  */
1695                 pjl = find_newer_jl_for_cn(cn);
1696                 if (!pjl && cn->blocknr && cn->bh
1697                     && buffer_journal_dirty(cn->bh)) {
1698                         BUG_ON(!can_dirty(cn));
1699                         /*
1700                          * if the buffer is prepared, it will either be logged
1701                          * or restored.  If restored, we need to make sure
1702                          * it actually gets marked dirty
1703                          */
1704                         clear_buffer_journal_new(cn->bh);
1705                         if (buffer_journal_prepared(cn->bh)) {
1706                                 set_buffer_journal_restore_dirty(cn->bh);
1707                         } else {
1708                                 set_buffer_journal_test(cn->bh);
1709                                 mark_buffer_dirty(cn->bh);
1710                         }
1711                 }
1712                 cn = cn->next;
1713         }
1714 }
1715
1716 static int kupdate_transactions(struct super_block *s,
1717                                 struct reiserfs_journal_list *jl,
1718                                 struct reiserfs_journal_list **next_jl,
1719                                 unsigned int *next_trans_id,
1720                                 int num_blocks, int num_trans)
1721 {
1722         int ret = 0;
1723         int written = 0;
1724         int transactions_flushed = 0;
1725         unsigned int orig_trans_id = jl->j_trans_id;
1726         struct buffer_chunk chunk;
1727         struct list_head *entry;
1728         struct reiserfs_journal *journal = SB_JOURNAL(s);
1729         chunk.nr = 0;
1730
1731         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1732         if (!journal_list_still_alive(s, orig_trans_id)) {
1733                 goto done;
1734         }
1735
1736         /*
1737          * we've got j_flush_mutex held, nobody is going to delete any
1738          * of these lists out from underneath us
1739          */
1740         while ((num_trans && transactions_flushed < num_trans) ||
1741                (!num_trans && written < num_blocks)) {
1742
1743                 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1744                     atomic_read(&jl->j_commit_left)
1745                     || !(jl->j_state & LIST_DIRTY)) {
1746                         del_from_work_list(s, jl);
1747                         break;
1748                 }
1749                 ret = write_one_transaction(s, jl, &chunk);
1750
1751                 if (ret < 0)
1752                         goto done;
1753                 transactions_flushed++;
1754                 written += ret;
1755                 entry = jl->j_list.next;
1756
1757                 /* did we wrap? */
1758                 if (entry == &journal->j_journal_list) {
1759                         break;
1760                 }
1761                 jl = JOURNAL_LIST_ENTRY(entry);
1762
1763                 /* don't bother with older transactions */
1764                 if (jl->j_trans_id <= orig_trans_id)
1765                         break;
1766         }
1767         if (chunk.nr) {
1768                 write_chunk(&chunk);
1769         }
1770
1771 done:
1772         mutex_unlock(&journal->j_flush_mutex);
1773         return ret;
1774 }
1775
1776 /*
1777  * for o_sync and fsync heavy applications, they tend to use
1778  * all the journa list slots with tiny transactions.  These
1779  * trigger lots and lots of calls to update the header block, which
1780  * adds seeks and slows things down.
1781  *
1782  * This function tries to clear out a large chunk of the journal lists
1783  * at once, which makes everything faster since only the newest journal
1784  * list updates the header block
1785  */
1786 static int flush_used_journal_lists(struct super_block *s,
1787                                     struct reiserfs_journal_list *jl)
1788 {
1789         unsigned long len = 0;
1790         unsigned long cur_len;
1791         int i;
1792         int limit = 256;
1793         struct reiserfs_journal_list *tjl;
1794         struct reiserfs_journal_list *flush_jl;
1795         unsigned int trans_id;
1796         struct reiserfs_journal *journal = SB_JOURNAL(s);
1797
1798         flush_jl = tjl = jl;
1799
1800         /* in data logging mode, try harder to flush a lot of blocks */
1801         if (reiserfs_data_log(s))
1802                 limit = 1024;
1803         /* flush for 256 transactions or limit blocks, whichever comes first */
1804         for (i = 0; i < 256 && len < limit; i++) {
1805                 if (atomic_read(&tjl->j_commit_left) ||
1806                     tjl->j_trans_id < jl->j_trans_id) {
1807                         break;
1808                 }
1809                 cur_len = atomic_read(&tjl->j_nonzerolen);
1810                 if (cur_len > 0) {
1811                         tjl->j_state &= ~LIST_TOUCHED;
1812                 }
1813                 len += cur_len;
1814                 flush_jl = tjl;
1815                 if (tjl->j_list.next == &journal->j_journal_list)
1816                         break;
1817                 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1818         }
1819         get_journal_list(jl);
1820         get_journal_list(flush_jl);
1821
1822         /*
1823          * try to find a group of blocks we can flush across all the
1824          * transactions, but only bother if we've actually spanned
1825          * across multiple lists
1826          */
1827         if (flush_jl != jl)
1828                 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1829
1830         flush_journal_list(s, flush_jl, 1);
1831         put_journal_list(s, flush_jl);
1832         put_journal_list(s, jl);
1833         return 0;
1834 }
1835
1836 /*
1837  * removes any nodes in table with name block and dev as bh.
1838  * only touchs the hnext and hprev pointers.
1839  */
1840 static void remove_journal_hash(struct super_block *sb,
1841                          struct reiserfs_journal_cnode **table,
1842                          struct reiserfs_journal_list *jl,
1843                          unsigned long block, int remove_freed)
1844 {
1845         struct reiserfs_journal_cnode *cur;
1846         struct reiserfs_journal_cnode **head;
1847
1848         head = &(journal_hash(table, sb, block));
1849         if (!head) {
1850                 return;
1851         }
1852         cur = *head;
1853         while (cur) {
1854                 if (cur->blocknr == block && cur->sb == sb
1855                     && (jl == NULL || jl == cur->jlist)
1856                     && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1857                         if (cur->hnext) {
1858                                 cur->hnext->hprev = cur->hprev;
1859                         }
1860                         if (cur->hprev) {
1861                                 cur->hprev->hnext = cur->hnext;
1862                         } else {
1863                                 *head = cur->hnext;
1864                         }
1865                         cur->blocknr = 0;
1866                         cur->sb = NULL;
1867                         cur->state = 0;
1868                         /*
1869                          * anybody who clears the cur->bh will also
1870                          * dec the nonzerolen
1871                          */
1872                         if (cur->bh && cur->jlist)
1873                                 atomic_dec(&cur->jlist->j_nonzerolen);
1874                         cur->bh = NULL;
1875                         cur->jlist = NULL;
1876                 }
1877                 cur = cur->hnext;
1878         }
1879 }
1880
1881 static void free_journal_ram(struct super_block *sb)
1882 {
1883         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1884         kfree(journal->j_current_jl);
1885         journal->j_num_lists--;
1886
1887         vfree(journal->j_cnode_free_orig);
1888         free_list_bitmaps(sb, journal->j_list_bitmap);
1889         free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1890         if (journal->j_header_bh) {
1891                 brelse(journal->j_header_bh);
1892         }
1893         /*
1894          * j_header_bh is on the journal dev, make sure
1895          * not to release the journal dev until we brelse j_header_bh
1896          */
1897         release_journal_dev(sb, journal);
1898         vfree(journal);
1899 }
1900
1901 /*
1902  * call on unmount.  Only set error to 1 if you haven't made your way out
1903  * of read_super() yet.  Any other caller must keep error at 0.
1904  */
1905 static int do_journal_release(struct reiserfs_transaction_handle *th,
1906                               struct super_block *sb, int error)
1907 {
1908         struct reiserfs_transaction_handle myth;
1909         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1910
1911         /*
1912          * we only want to flush out transactions if we were
1913          * called with error == 0
1914          */
1915         if (!error && !sb_rdonly(sb)) {
1916                 /* end the current trans */
1917                 BUG_ON(!th->t_trans_id);
1918                 do_journal_end(th, FLUSH_ALL);
1919
1920                 /*
1921                  * make sure something gets logged to force
1922                  * our way into the flush code
1923                  */
1924                 if (!journal_join(&myth, sb)) {
1925                         reiserfs_prepare_for_journal(sb,
1926                                                      SB_BUFFER_WITH_SB(sb),
1927                                                      1);
1928                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1929                         do_journal_end(&myth, FLUSH_ALL);
1930                 }
1931         }
1932
1933         /* this also catches errors during the do_journal_end above */
1934         if (!error && reiserfs_is_journal_aborted(journal)) {
1935                 memset(&myth, 0, sizeof(myth));
1936                 if (!journal_join_abort(&myth, sb)) {
1937                         reiserfs_prepare_for_journal(sb,
1938                                                      SB_BUFFER_WITH_SB(sb),
1939                                                      1);
1940                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1941                         do_journal_end(&myth, FLUSH_ALL);
1942                 }
1943         }
1944
1945
1946         /*
1947          * We must release the write lock here because
1948          * the workqueue job (flush_async_commit) needs this lock
1949          */
1950         reiserfs_write_unlock(sb);
1951
1952         /*
1953          * Cancel flushing of old commits. Note that neither of these works
1954          * will be requeued because superblock is being shutdown and doesn't
1955          * have SB_ACTIVE set.
1956          */
1957         reiserfs_cancel_old_flush(sb);
1958         /* wait for all commits to finish */
1959         cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1960
1961         free_journal_ram(sb);
1962
1963         reiserfs_write_lock(sb);
1964
1965         return 0;
1966 }
1967
1968 /* * call on unmount.  flush all journal trans, release all alloc'd ram */
1969 int journal_release(struct reiserfs_transaction_handle *th,
1970                     struct super_block *sb)
1971 {
1972         return do_journal_release(th, sb, 0);
1973 }
1974
1975 /* only call from an error condition inside reiserfs_read_super!  */
1976 int journal_release_error(struct reiserfs_transaction_handle *th,
1977                           struct super_block *sb)
1978 {
1979         return do_journal_release(th, sb, 1);
1980 }
1981
1982 /*
1983  * compares description block with commit block.
1984  * returns 1 if they differ, 0 if they are the same
1985  */
1986 static int journal_compare_desc_commit(struct super_block *sb,
1987                                        struct reiserfs_journal_desc *desc,
1988                                        struct reiserfs_journal_commit *commit)
1989 {
1990         if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1991             get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1992             get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1993             get_commit_trans_len(commit) <= 0) {
1994                 return 1;
1995         }
1996         return 0;
1997 }
1998
1999 /*
2000  * returns 0 if it did not find a description block
2001  * returns -1 if it found a corrupt commit block
2002  * returns 1 if both desc and commit were valid
2003  * NOTE: only called during fs mount
2004  */
2005 static int journal_transaction_is_valid(struct super_block *sb,
2006                                         struct buffer_head *d_bh,
2007                                         unsigned int *oldest_invalid_trans_id,
2008                                         unsigned long *newest_mount_id)
2009 {
2010         struct reiserfs_journal_desc *desc;
2011         struct reiserfs_journal_commit *commit;
2012         struct buffer_head *c_bh;
2013         unsigned long offset;
2014
2015         if (!d_bh)
2016                 return 0;
2017
2018         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2019         if (get_desc_trans_len(desc) > 0
2020             && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2021                 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2022                     && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2023                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2024                                        "journal-986: transaction "
2025                                        "is valid returning because trans_id %d is greater than "
2026                                        "oldest_invalid %lu",
2027                                        get_desc_trans_id(desc),
2028                                        *oldest_invalid_trans_id);
2029                         return 0;
2030                 }
2031                 if (newest_mount_id
2032                     && *newest_mount_id > get_desc_mount_id(desc)) {
2033                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2034                                        "journal-1087: transaction "
2035                                        "is valid returning because mount_id %d is less than "
2036                                        "newest_mount_id %lu",
2037                                        get_desc_mount_id(desc),
2038                                        *newest_mount_id);
2039                         return -1;
2040                 }
2041                 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2042                         reiserfs_warning(sb, "journal-2018",
2043                                          "Bad transaction length %d "
2044                                          "encountered, ignoring transaction",
2045                                          get_desc_trans_len(desc));
2046                         return -1;
2047                 }
2048                 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2049
2050                 /*
2051                  * ok, we have a journal description block,
2052                  * let's see if the transaction was valid
2053                  */
2054                 c_bh =
2055                     journal_bread(sb,
2056                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2057                                   ((offset + get_desc_trans_len(desc) +
2058                                     1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2059                 if (!c_bh)
2060                         return 0;
2061                 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2062                 if (journal_compare_desc_commit(sb, desc, commit)) {
2063                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2064                                        "journal_transaction_is_valid, commit offset %ld had bad "
2065                                        "time %d or length %d",
2066                                        c_bh->b_blocknr -
2067                                        SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2068                                        get_commit_trans_id(commit),
2069                                        get_commit_trans_len(commit));
2070                         brelse(c_bh);
2071                         if (oldest_invalid_trans_id) {
2072                                 *oldest_invalid_trans_id =
2073                                     get_desc_trans_id(desc);
2074                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2075                                                "journal-1004: "
2076                                                "transaction_is_valid setting oldest invalid trans_id "
2077                                                "to %d",
2078                                                get_desc_trans_id(desc));
2079                         }
2080                         return -1;
2081                 }
2082                 brelse(c_bh);
2083                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2084                                "journal-1006: found valid "
2085                                "transaction start offset %llu, len %d id %d",
2086                                d_bh->b_blocknr -
2087                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2088                                get_desc_trans_len(desc),
2089                                get_desc_trans_id(desc));
2090                 return 1;
2091         } else {
2092                 return 0;
2093         }
2094 }
2095
2096 static void brelse_array(struct buffer_head **heads, int num)
2097 {
2098         int i;
2099         for (i = 0; i < num; i++) {
2100                 brelse(heads[i]);
2101         }
2102 }
2103
2104 /*
2105  * given the start, and values for the oldest acceptable transactions,
2106  * this either reads in a replays a transaction, or returns because the
2107  * transaction is invalid, or too old.
2108  * NOTE: only called during fs mount
2109  */
2110 static int journal_read_transaction(struct super_block *sb,
2111                                     unsigned long cur_dblock,
2112                                     unsigned long oldest_start,
2113                                     unsigned int oldest_trans_id,
2114                                     unsigned long newest_mount_id)
2115 {
2116         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2117         struct reiserfs_journal_desc *desc;
2118         struct reiserfs_journal_commit *commit;
2119         unsigned int trans_id = 0;
2120         struct buffer_head *c_bh;
2121         struct buffer_head *d_bh;
2122         struct buffer_head **log_blocks = NULL;
2123         struct buffer_head **real_blocks = NULL;
2124         unsigned int trans_offset;
2125         int i;
2126         int trans_half;
2127
2128         d_bh = journal_bread(sb, cur_dblock);
2129         if (!d_bh)
2130                 return 1;
2131         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2132         trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2133         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2134                        "journal_read_transaction, offset %llu, len %d mount_id %d",
2135                        d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2136                        get_desc_trans_len(desc), get_desc_mount_id(desc));
2137         if (get_desc_trans_id(desc) < oldest_trans_id) {
2138                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2139                                "journal_read_trans skipping because %lu is too old",
2140                                cur_dblock -
2141                                SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2142                 brelse(d_bh);
2143                 return 1;
2144         }
2145         if (get_desc_mount_id(desc) != newest_mount_id) {
2146                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2147                                "journal_read_trans skipping because %d is != "
2148                                "newest_mount_id %lu", get_desc_mount_id(desc),
2149                                newest_mount_id);
2150                 brelse(d_bh);
2151                 return 1;
2152         }
2153         c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2154                              ((trans_offset + get_desc_trans_len(desc) + 1) %
2155                               SB_ONDISK_JOURNAL_SIZE(sb)));
2156         if (!c_bh) {
2157                 brelse(d_bh);
2158                 return 1;
2159         }
2160         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2161         if (journal_compare_desc_commit(sb, desc, commit)) {
2162                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2163                                "journal_read_transaction, "
2164                                "commit offset %llu had bad time %d or length %d",
2165                                c_bh->b_blocknr -
2166                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2167                                get_commit_trans_id(commit),
2168                                get_commit_trans_len(commit));
2169                 brelse(c_bh);
2170                 brelse(d_bh);
2171                 return 1;
2172         }
2173
2174         if (bdev_read_only(sb->s_bdev)) {
2175                 reiserfs_warning(sb, "clm-2076",
2176                                  "device is readonly, unable to replay log");
2177                 brelse(c_bh);
2178                 brelse(d_bh);
2179                 return -EROFS;
2180         }
2181
2182         trans_id = get_desc_trans_id(desc);
2183         /*
2184          * now we know we've got a good transaction, and it was
2185          * inside the valid time ranges
2186          */
2187         log_blocks = kmalloc_array(get_desc_trans_len(desc),
2188                                    sizeof(struct buffer_head *),
2189                                    GFP_NOFS);
2190         real_blocks = kmalloc_array(get_desc_trans_len(desc),
2191                                     sizeof(struct buffer_head *),
2192                                     GFP_NOFS);
2193         if (!log_blocks || !real_blocks) {
2194                 brelse(c_bh);
2195                 brelse(d_bh);
2196                 kfree(log_blocks);
2197                 kfree(real_blocks);
2198                 reiserfs_warning(sb, "journal-1169",
2199                                  "kmalloc failed, unable to mount FS");
2200                 return -1;
2201         }
2202         /* get all the buffer heads */
2203         trans_half = journal_trans_half(sb->s_blocksize);
2204         for (i = 0; i < get_desc_trans_len(desc); i++) {
2205                 log_blocks[i] =
2206                     journal_getblk(sb,
2207                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2208                                    (trans_offset + 1 +
2209                                     i) % SB_ONDISK_JOURNAL_SIZE(sb));
2210                 if (i < trans_half) {
2211                         real_blocks[i] =
2212                             sb_getblk(sb,
2213                                       le32_to_cpu(desc->j_realblock[i]));
2214                 } else {
2215                         real_blocks[i] =
2216                             sb_getblk(sb,
2217                                       le32_to_cpu(commit->
2218                                                   j_realblock[i - trans_half]));
2219                 }
2220                 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2221                         reiserfs_warning(sb, "journal-1207",
2222                                          "REPLAY FAILURE fsck required! "
2223                                          "Block to replay is outside of "
2224                                          "filesystem");
2225                         goto abort_replay;
2226                 }
2227                 /* make sure we don't try to replay onto log or reserved area */
2228                 if (is_block_in_log_or_reserved_area
2229                     (sb, real_blocks[i]->b_blocknr)) {
2230                         reiserfs_warning(sb, "journal-1204",
2231                                          "REPLAY FAILURE fsck required! "
2232                                          "Trying to replay onto a log block");
2233 abort_replay:
2234                         brelse_array(log_blocks, i);
2235                         brelse_array(real_blocks, i);
2236                         brelse(c_bh);
2237                         brelse(d_bh);
2238                         kfree(log_blocks);
2239                         kfree(real_blocks);
2240                         return -1;
2241                 }
2242         }
2243         /* read in the log blocks, memcpy to the corresponding real block */
2244         ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2245         for (i = 0; i < get_desc_trans_len(desc); i++) {
2246
2247                 wait_on_buffer(log_blocks[i]);
2248                 if (!buffer_uptodate(log_blocks[i])) {
2249                         reiserfs_warning(sb, "journal-1212",
2250                                          "REPLAY FAILURE fsck required! "
2251                                          "buffer write failed");
2252                         brelse_array(log_blocks + i,
2253                                      get_desc_trans_len(desc) - i);
2254                         brelse_array(real_blocks, get_desc_trans_len(desc));
2255                         brelse(c_bh);
2256                         brelse(d_bh);
2257                         kfree(log_blocks);
2258                         kfree(real_blocks);
2259                         return -1;
2260                 }
2261                 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2262                        real_blocks[i]->b_size);
2263                 set_buffer_uptodate(real_blocks[i]);
2264                 brelse(log_blocks[i]);
2265         }
2266         /* flush out the real blocks */
2267         for (i = 0; i < get_desc_trans_len(desc); i++) {
2268                 set_buffer_dirty(real_blocks[i]);
2269                 write_dirty_buffer(real_blocks[i], 0);
2270         }
2271         for (i = 0; i < get_desc_trans_len(desc); i++) {
2272                 wait_on_buffer(real_blocks[i]);
2273                 if (!buffer_uptodate(real_blocks[i])) {
2274                         reiserfs_warning(sb, "journal-1226",
2275                                          "REPLAY FAILURE, fsck required! "
2276                                          "buffer write failed");
2277                         brelse_array(real_blocks + i,
2278                                      get_desc_trans_len(desc) - i);
2279                         brelse(c_bh);
2280                         brelse(d_bh);
2281                         kfree(log_blocks);
2282                         kfree(real_blocks);
2283                         return -1;
2284                 }
2285                 brelse(real_blocks[i]);
2286         }
2287         cur_dblock =
2288             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2289             ((trans_offset + get_desc_trans_len(desc) +
2290               2) % SB_ONDISK_JOURNAL_SIZE(sb));
2291         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2292                        "journal-1095: setting journal " "start to offset %ld",
2293                        cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2294
2295         /*
2296          * init starting values for the first transaction, in case
2297          * this is the last transaction to be replayed.
2298          */
2299         journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2300         journal->j_last_flush_trans_id = trans_id;
2301         journal->j_trans_id = trans_id + 1;
2302         /* check for trans_id overflow */
2303         if (journal->j_trans_id == 0)
2304                 journal->j_trans_id = 10;
2305         brelse(c_bh);
2306         brelse(d_bh);
2307         kfree(log_blocks);
2308         kfree(real_blocks);
2309         return 0;
2310 }
2311
2312 /*
2313  * This function reads blocks starting from block and to max_block of bufsize
2314  * size (but no more than BUFNR blocks at a time). This proved to improve
2315  * mounting speed on self-rebuilding raid5 arrays at least.
2316  * Right now it is only used from journal code. But later we might use it
2317  * from other places.
2318  * Note: Do not use journal_getblk/sb_getblk functions here!
2319  */
2320 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2321                                            b_blocknr_t block, int bufsize,
2322                                            b_blocknr_t max_block)
2323 {
2324         struct buffer_head *bhlist[BUFNR];
2325         unsigned int blocks = BUFNR;
2326         struct buffer_head *bh;
2327         int i, j;
2328
2329         bh = __getblk(dev, block, bufsize);
2330         if (buffer_uptodate(bh))
2331                 return (bh);
2332
2333         if (block + BUFNR > max_block) {
2334                 blocks = max_block - block;
2335         }
2336         bhlist[0] = bh;
2337         j = 1;
2338         for (i = 1; i < blocks; i++) {
2339                 bh = __getblk(dev, block + i, bufsize);
2340                 if (buffer_uptodate(bh)) {
2341                         brelse(bh);
2342                         break;
2343                 } else
2344                         bhlist[j++] = bh;
2345         }
2346         ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2347         for (i = 1; i < j; i++)
2348                 brelse(bhlist[i]);
2349         bh = bhlist[0];
2350         wait_on_buffer(bh);
2351         if (buffer_uptodate(bh))
2352                 return bh;
2353         brelse(bh);
2354         return NULL;
2355 }
2356
2357 /*
2358  * read and replay the log
2359  * on a clean unmount, the journal header's next unflushed pointer will be
2360  * to an invalid transaction.  This tests that before finding all the
2361  * transactions in the log, which makes normal mount times fast.
2362  *
2363  * After a crash, this starts with the next unflushed transaction, and
2364  * replays until it finds one too old, or invalid.
2365  *
2366  * On exit, it sets things up so the first transaction will work correctly.
2367  * NOTE: only called during fs mount
2368  */
2369 static int journal_read(struct super_block *sb)
2370 {
2371         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2372         struct reiserfs_journal_desc *desc;
2373         unsigned int oldest_trans_id = 0;
2374         unsigned int oldest_invalid_trans_id = 0;
2375         time64_t start;
2376         unsigned long oldest_start = 0;
2377         unsigned long cur_dblock = 0;
2378         unsigned long newest_mount_id = 9;
2379         struct buffer_head *d_bh;
2380         struct reiserfs_journal_header *jh;
2381         int valid_journal_header = 0;
2382         int replay_count = 0;
2383         int continue_replay = 1;
2384         int ret;
2385
2386         cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2387         reiserfs_info(sb, "checking transaction log (%pg)\n",
2388                       journal->j_dev_bd);
2389         start = ktime_get_seconds();
2390
2391         /*
2392          * step 1, read in the journal header block.  Check the transaction
2393          * it says is the first unflushed, and if that transaction is not
2394          * valid, replay is done
2395          */
2396         journal->j_header_bh = journal_bread(sb,
2397                                              SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2398                                              + SB_ONDISK_JOURNAL_SIZE(sb));
2399         if (!journal->j_header_bh) {
2400                 return 1;
2401         }
2402         jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2403         if (le32_to_cpu(jh->j_first_unflushed_offset) <
2404             SB_ONDISK_JOURNAL_SIZE(sb)
2405             && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2406                 oldest_start =
2407                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2408                     le32_to_cpu(jh->j_first_unflushed_offset);
2409                 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2410                 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2411                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2412                                "journal-1153: found in "
2413                                "header: first_unflushed_offset %d, last_flushed_trans_id "
2414                                "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2415                                le32_to_cpu(jh->j_last_flush_trans_id));
2416                 valid_journal_header = 1;
2417
2418                 /*
2419                  * now, we try to read the first unflushed offset.  If it
2420                  * is not valid, there is nothing more we can do, and it
2421                  * makes no sense to read through the whole log.
2422                  */
2423                 d_bh =
2424                     journal_bread(sb,
2425                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2426                                   le32_to_cpu(jh->j_first_unflushed_offset));
2427                 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2428                 if (!ret) {
2429                         continue_replay = 0;
2430                 }
2431                 brelse(d_bh);
2432                 goto start_log_replay;
2433         }
2434
2435         /*
2436          * ok, there are transactions that need to be replayed.  start
2437          * with the first log block, find all the valid transactions, and
2438          * pick out the oldest.
2439          */
2440         while (continue_replay
2441                && cur_dblock <
2442                (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2443                 SB_ONDISK_JOURNAL_SIZE(sb))) {
2444                 /*
2445                  * Note that it is required for blocksize of primary fs
2446                  * device and journal device to be the same
2447                  */
2448                 d_bh =
2449                     reiserfs_breada(journal->j_dev_bd, cur_dblock,
2450                                     sb->s_blocksize,
2451                                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2452                                     SB_ONDISK_JOURNAL_SIZE(sb));
2453                 ret =
2454                     journal_transaction_is_valid(sb, d_bh,
2455                                                  &oldest_invalid_trans_id,
2456                                                  &newest_mount_id);
2457                 if (ret == 1) {
2458                         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2459                         if (oldest_start == 0) {        /* init all oldest_ values */
2460                                 oldest_trans_id = get_desc_trans_id(desc);
2461                                 oldest_start = d_bh->b_blocknr;
2462                                 newest_mount_id = get_desc_mount_id(desc);
2463                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2464                                                "journal-1179: Setting "
2465                                                "oldest_start to offset %llu, trans_id %lu",
2466                                                oldest_start -
2467                                                SB_ONDISK_JOURNAL_1st_BLOCK
2468                                                (sb), oldest_trans_id);
2469                         } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2470                                 /* one we just read was older */
2471                                 oldest_trans_id = get_desc_trans_id(desc);
2472                                 oldest_start = d_bh->b_blocknr;
2473                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2474                                                "journal-1180: Resetting "
2475                                                "oldest_start to offset %lu, trans_id %lu",
2476                                                oldest_start -
2477                                                SB_ONDISK_JOURNAL_1st_BLOCK
2478                                                (sb), oldest_trans_id);
2479                         }
2480                         if (newest_mount_id < get_desc_mount_id(desc)) {
2481                                 newest_mount_id = get_desc_mount_id(desc);
2482                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2483                                                "journal-1299: Setting "
2484                                                "newest_mount_id to %d",
2485                                                get_desc_mount_id(desc));
2486                         }
2487                         cur_dblock += get_desc_trans_len(desc) + 2;
2488                 } else {
2489                         cur_dblock++;
2490                 }
2491                 brelse(d_bh);
2492         }
2493
2494 start_log_replay:
2495         cur_dblock = oldest_start;
2496         if (oldest_trans_id) {
2497                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2498                                "journal-1206: Starting replay "
2499                                "from offset %llu, trans_id %lu",
2500                                cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2501                                oldest_trans_id);
2502
2503         }
2504         replay_count = 0;
2505         while (continue_replay && oldest_trans_id > 0) {
2506                 ret =
2507                     journal_read_transaction(sb, cur_dblock, oldest_start,
2508                                              oldest_trans_id, newest_mount_id);
2509                 if (ret < 0) {
2510                         return ret;
2511                 } else if (ret != 0) {
2512                         break;
2513                 }
2514                 cur_dblock =
2515                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2516                 replay_count++;
2517                 if (cur_dblock == oldest_start)
2518                         break;
2519         }
2520
2521         if (oldest_trans_id == 0) {
2522                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2523                                "journal-1225: No valid " "transactions found");
2524         }
2525         /*
2526          * j_start does not get set correctly if we don't replay any
2527          * transactions.  if we had a valid journal_header, set j_start
2528          * to the first unflushed transaction value, copy the trans_id
2529          * from the header
2530          */
2531         if (valid_journal_header && replay_count == 0) {
2532                 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2533                 journal->j_trans_id =
2534                     le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2535                 /* check for trans_id overflow */
2536                 if (journal->j_trans_id == 0)
2537                         journal->j_trans_id = 10;
2538                 journal->j_last_flush_trans_id =
2539                     le32_to_cpu(jh->j_last_flush_trans_id);
2540                 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2541         } else {
2542                 journal->j_mount_id = newest_mount_id + 1;
2543         }
2544         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2545                        "newest_mount_id to %lu", journal->j_mount_id);
2546         journal->j_first_unflushed_offset = journal->j_start;
2547         if (replay_count > 0) {
2548                 reiserfs_info(sb,
2549                               "replayed %d transactions in %lu seconds\n",
2550                               replay_count, ktime_get_seconds() - start);
2551         }
2552         /* needed to satisfy the locking in _update_journal_header_block */
2553         reiserfs_write_lock(sb);
2554         if (!bdev_read_only(sb->s_bdev) &&
2555             _update_journal_header_block(sb, journal->j_start,
2556                                          journal->j_last_flush_trans_id)) {
2557                 reiserfs_write_unlock(sb);
2558                 /*
2559                  * replay failed, caller must call free_journal_ram and abort
2560                  * the mount
2561                  */
2562                 return -1;
2563         }
2564         reiserfs_write_unlock(sb);
2565         return 0;
2566 }
2567
2568 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2569 {
2570         struct reiserfs_journal_list *jl;
2571         jl = kzalloc(sizeof(struct reiserfs_journal_list),
2572                      GFP_NOFS | __GFP_NOFAIL);
2573         INIT_LIST_HEAD(&jl->j_list);
2574         INIT_LIST_HEAD(&jl->j_working_list);
2575         INIT_LIST_HEAD(&jl->j_tail_bh_list);
2576         INIT_LIST_HEAD(&jl->j_bh_list);
2577         mutex_init(&jl->j_commit_mutex);
2578         SB_JOURNAL(s)->j_num_lists++;
2579         get_journal_list(jl);
2580         return jl;
2581 }
2582
2583 static void journal_list_init(struct super_block *sb)
2584 {
2585         SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2586 }
2587
2588 static void release_journal_dev(struct super_block *super,
2589                                struct reiserfs_journal *journal)
2590 {
2591         if (journal->j_dev_bd != NULL) {
2592                 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2593                 journal->j_dev_bd = NULL;
2594         }
2595 }
2596
2597 static int journal_init_dev(struct super_block *super,
2598                             struct reiserfs_journal *journal,
2599                             const char *jdev_name)
2600 {
2601         int result;
2602         dev_t jdev;
2603         fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2604         char b[BDEVNAME_SIZE];
2605
2606         result = 0;
2607
2608         journal->j_dev_bd = NULL;
2609         jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2610             new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2611
2612         if (bdev_read_only(super->s_bdev))
2613                 blkdev_mode = FMODE_READ;
2614
2615         /* there is no "jdev" option and journal is on separate device */
2616         if ((!jdev_name || !jdev_name[0])) {
2617                 if (jdev == super->s_dev)
2618                         blkdev_mode &= ~FMODE_EXCL;
2619                 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2620                                                       journal);
2621                 journal->j_dev_mode = blkdev_mode;
2622                 if (IS_ERR(journal->j_dev_bd)) {
2623                         result = PTR_ERR(journal->j_dev_bd);
2624                         journal->j_dev_bd = NULL;
2625                         reiserfs_warning(super, "sh-458",
2626                                          "cannot init journal device '%s': %i",
2627                                          __bdevname(jdev, b), result);
2628                         return result;
2629                 } else if (jdev != super->s_dev)
2630                         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2631
2632                 return 0;
2633         }
2634
2635         journal->j_dev_mode = blkdev_mode;
2636         journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2637         if (IS_ERR(journal->j_dev_bd)) {
2638                 result = PTR_ERR(journal->j_dev_bd);
2639                 journal->j_dev_bd = NULL;
2640                 reiserfs_warning(super, "sh-457",
2641                                  "journal_init_dev: Cannot open '%s': %i",
2642                                  jdev_name, result);
2643                 return result;
2644         }
2645
2646         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2647         reiserfs_info(super,
2648                       "journal_init_dev: journal device: %pg\n",
2649                       journal->j_dev_bd);
2650         return 0;
2651 }
2652
2653 /*
2654  * When creating/tuning a file system user can assign some
2655  * journal params within boundaries which depend on the ratio
2656  * blocksize/standard_blocksize.
2657  *
2658  * For blocks >= standard_blocksize transaction size should
2659  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2660  * then JOURNAL_TRANS_MAX_DEFAULT.
2661  *
2662  * For blocks < standard_blocksize these boundaries should be
2663  * decreased proportionally.
2664  */
2665 #define REISERFS_STANDARD_BLKSIZE (4096)
2666
2667 static int check_advise_trans_params(struct super_block *sb,
2668                                      struct reiserfs_journal *journal)
2669 {
2670         if (journal->j_trans_max) {
2671                 /* Non-default journal params.  Do sanity check for them. */
2672                 int ratio = 1;
2673                 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2674                         ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2675
2676                 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2677                     journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2678                     SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2679                     JOURNAL_MIN_RATIO) {
2680                         reiserfs_warning(sb, "sh-462",
2681                                          "bad transaction max size (%u). "
2682                                          "FSCK?", journal->j_trans_max);
2683                         return 1;
2684                 }
2685                 if (journal->j_max_batch != (journal->j_trans_max) *
2686                         JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2687                         reiserfs_warning(sb, "sh-463",
2688                                          "bad transaction max batch (%u). "
2689                                          "FSCK?", journal->j_max_batch);
2690                         return 1;
2691                 }
2692         } else {
2693                 /*
2694                  * Default journal params.
2695                  * The file system was created by old version
2696                  * of mkreiserfs, so some fields contain zeros,
2697                  * and we need to advise proper values for them
2698                  */
2699                 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2700                         reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2701                                          sb->s_blocksize);
2702                         return 1;
2703                 }
2704                 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2705                 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2706                 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2707         }
2708         return 0;
2709 }
2710
2711 /* must be called once on fs mount.  calls journal_read for you */
2712 int journal_init(struct super_block *sb, const char *j_dev_name,
2713                  int old_format, unsigned int commit_max_age)
2714 {
2715         int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2716         struct buffer_head *bhjh;
2717         struct reiserfs_super_block *rs;
2718         struct reiserfs_journal_header *jh;
2719         struct reiserfs_journal *journal;
2720         struct reiserfs_journal_list *jl;
2721         int ret;
2722
2723         journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2724         if (!journal) {
2725                 reiserfs_warning(sb, "journal-1256",
2726                                  "unable to get memory for journal structure");
2727                 return 1;
2728         }
2729         INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2730         INIT_LIST_HEAD(&journal->j_prealloc_list);
2731         INIT_LIST_HEAD(&journal->j_working_list);
2732         INIT_LIST_HEAD(&journal->j_journal_list);
2733         journal->j_persistent_trans = 0;
2734         if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2735                                            reiserfs_bmap_count(sb)))
2736                 goto free_and_return;
2737
2738         allocate_bitmap_nodes(sb);
2739
2740         /* reserved for journal area support */
2741         SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2742                                                  REISERFS_OLD_DISK_OFFSET_IN_BYTES
2743                                                  / sb->s_blocksize +
2744                                                  reiserfs_bmap_count(sb) +
2745                                                  1 :
2746                                                  REISERFS_DISK_OFFSET_IN_BYTES /
2747                                                  sb->s_blocksize + 2);
2748
2749         /*
2750          * Sanity check to see is the standard journal fitting
2751          * within first bitmap (actual for small blocksizes)
2752          */
2753         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2754             (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2755              SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2756                 reiserfs_warning(sb, "journal-1393",
2757                                  "journal does not fit for area addressed "
2758                                  "by first of bitmap blocks. It starts at "
2759                                  "%u and its size is %u. Block size %ld",
2760                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2761                                  SB_ONDISK_JOURNAL_SIZE(sb),
2762                                  sb->s_blocksize);
2763                 goto free_and_return;
2764         }
2765
2766         if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2767                 reiserfs_warning(sb, "sh-462",
2768                                  "unable to initialize journal device");
2769                 goto free_and_return;
2770         }
2771
2772         rs = SB_DISK_SUPER_BLOCK(sb);
2773
2774         /* read journal header */
2775         bhjh = journal_bread(sb,
2776                              SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2777                              SB_ONDISK_JOURNAL_SIZE(sb));
2778         if (!bhjh) {
2779                 reiserfs_warning(sb, "sh-459",
2780                                  "unable to read journal header");
2781                 goto free_and_return;
2782         }
2783         jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2784
2785         /* make sure that journal matches to the super block */
2786         if (is_reiserfs_jr(rs)
2787             && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2788                 sb_jp_journal_magic(rs))) {
2789                 reiserfs_warning(sb, "sh-460",
2790                                  "journal header magic %x (device %pg) does "
2791                                  "not match to magic found in super block %x",
2792                                  jh->jh_journal.jp_journal_magic,
2793                                  journal->j_dev_bd,
2794                                  sb_jp_journal_magic(rs));
2795                 brelse(bhjh);
2796                 goto free_and_return;
2797         }
2798
2799         journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2800         journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2801         journal->j_max_commit_age =
2802             le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2803         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2804
2805         if (check_advise_trans_params(sb, journal) != 0)
2806                 goto free_and_return;
2807         journal->j_default_max_commit_age = journal->j_max_commit_age;
2808
2809         if (commit_max_age != 0) {
2810                 journal->j_max_commit_age = commit_max_age;
2811                 journal->j_max_trans_age = commit_max_age;
2812         }
2813
2814         reiserfs_info(sb, "journal params: device %pg, size %u, "
2815                       "journal first block %u, max trans len %u, max batch %u, "
2816                       "max commit age %u, max trans age %u\n",
2817                       journal->j_dev_bd,
2818                       SB_ONDISK_JOURNAL_SIZE(sb),
2819                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2820                       journal->j_trans_max,
2821                       journal->j_max_batch,
2822                       journal->j_max_commit_age, journal->j_max_trans_age);
2823
2824         brelse(bhjh);
2825
2826         journal->j_list_bitmap_index = 0;
2827         journal_list_init(sb);
2828
2829         memset(journal->j_list_hash_table, 0,
2830                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2831
2832         INIT_LIST_HEAD(&journal->j_dirty_buffers);
2833         spin_lock_init(&journal->j_dirty_buffers_lock);
2834
2835         journal->j_start = 0;
2836         journal->j_len = 0;
2837         journal->j_len_alloc = 0;
2838         atomic_set(&journal->j_wcount, 0);
2839         atomic_set(&journal->j_async_throttle, 0);
2840         journal->j_bcount = 0;
2841         journal->j_trans_start_time = 0;
2842         journal->j_last = NULL;
2843         journal->j_first = NULL;
2844         init_waitqueue_head(&journal->j_join_wait);
2845         mutex_init(&journal->j_mutex);
2846         mutex_init(&journal->j_flush_mutex);
2847
2848         journal->j_trans_id = 10;
2849         journal->j_mount_id = 10;
2850         journal->j_state = 0;
2851         atomic_set(&journal->j_jlock, 0);
2852         journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2853         journal->j_cnode_free_orig = journal->j_cnode_free_list;
2854         journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2855         journal->j_cnode_used = 0;
2856         journal->j_must_wait = 0;
2857
2858         if (journal->j_cnode_free == 0) {
2859                 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2860                                  "allocation failed (%ld bytes). Journal is "
2861                                  "too large for available memory. Usually "
2862                                  "this is due to a journal that is too large.",
2863                                  sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2864                 goto free_and_return;
2865         }
2866
2867         init_journal_hash(sb);
2868         jl = journal->j_current_jl;
2869
2870         /*
2871          * get_list_bitmap() may call flush_commit_list() which
2872          * requires the lock. Calling flush_commit_list() shouldn't happen
2873          * this early but I like to be paranoid.
2874          */
2875         reiserfs_write_lock(sb);
2876         jl->j_list_bitmap = get_list_bitmap(sb, jl);
2877         reiserfs_write_unlock(sb);
2878         if (!jl->j_list_bitmap) {
2879                 reiserfs_warning(sb, "journal-2005",
2880                                  "get_list_bitmap failed for journal list 0");
2881                 goto free_and_return;
2882         }
2883
2884         ret = journal_read(sb);
2885         if (ret < 0) {
2886                 reiserfs_warning(sb, "reiserfs-2006",
2887                                  "Replay Failure, unable to mount");
2888                 goto free_and_return;
2889         }
2890
2891         INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2892         journal->j_work_sb = sb;
2893         return 0;
2894 free_and_return:
2895         free_journal_ram(sb);
2896         return 1;
2897 }
2898
2899 /*
2900  * test for a polite end of the current transaction.  Used by file_write,
2901  * and should be used by delete to make sure they don't write more than
2902  * can fit inside a single transaction
2903  */
2904 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2905                                    int new_alloc)
2906 {
2907         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2908         time64_t now = ktime_get_seconds();
2909         /* cannot restart while nested */
2910         BUG_ON(!th->t_trans_id);
2911         if (th->t_refcount > 1)
2912                 return 0;
2913         if (journal->j_must_wait > 0 ||
2914             (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2915             atomic_read(&journal->j_jlock) ||
2916             (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2917             journal->j_cnode_free < (journal->j_trans_max * 3)) {
2918                 return 1;
2919         }
2920
2921         journal->j_len_alloc += new_alloc;
2922         th->t_blocks_allocated += new_alloc ;
2923         return 0;
2924 }
2925
2926 /* this must be called inside a transaction */
2927 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2928 {
2929         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2930         BUG_ON(!th->t_trans_id);
2931         journal->j_must_wait = 1;
2932         set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2933         return;
2934 }
2935
2936 /* this must be called without a transaction started */
2937 void reiserfs_allow_writes(struct super_block *s)
2938 {
2939         struct reiserfs_journal *journal = SB_JOURNAL(s);
2940         clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2941         wake_up(&journal->j_join_wait);
2942 }
2943
2944 /* this must be called without a transaction started */
2945 void reiserfs_wait_on_write_block(struct super_block *s)
2946 {
2947         struct reiserfs_journal *journal = SB_JOURNAL(s);
2948         wait_event(journal->j_join_wait,
2949                    !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2950 }
2951
2952 static void queue_log_writer(struct super_block *s)
2953 {
2954         wait_queue_entry_t wait;
2955         struct reiserfs_journal *journal = SB_JOURNAL(s);
2956         set_bit(J_WRITERS_QUEUED, &journal->j_state);
2957
2958         /*
2959          * we don't want to use wait_event here because
2960          * we only want to wait once.
2961          */
2962         init_waitqueue_entry(&wait, current);
2963         add_wait_queue(&journal->j_join_wait, &wait);
2964         set_current_state(TASK_UNINTERRUPTIBLE);
2965         if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2966                 int depth = reiserfs_write_unlock_nested(s);
2967                 schedule();
2968                 reiserfs_write_lock_nested(s, depth);
2969         }
2970         __set_current_state(TASK_RUNNING);
2971         remove_wait_queue(&journal->j_join_wait, &wait);
2972 }
2973
2974 static void wake_queued_writers(struct super_block *s)
2975 {
2976         struct reiserfs_journal *journal = SB_JOURNAL(s);
2977         if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2978                 wake_up(&journal->j_join_wait);
2979 }
2980
2981 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2982 {
2983         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2984         unsigned long bcount = journal->j_bcount;
2985         while (1) {
2986                 int depth;
2987
2988                 depth = reiserfs_write_unlock_nested(sb);
2989                 schedule_timeout_uninterruptible(1);
2990                 reiserfs_write_lock_nested(sb, depth);
2991
2992                 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2993                 while ((atomic_read(&journal->j_wcount) > 0 ||
2994                         atomic_read(&journal->j_jlock)) &&
2995                        journal->j_trans_id == trans_id) {
2996                         queue_log_writer(sb);
2997                 }
2998                 if (journal->j_trans_id != trans_id)
2999                         break;
3000                 if (bcount == journal->j_bcount)
3001                         break;
3002                 bcount = journal->j_bcount;
3003         }
3004 }
3005
3006 /*
3007  * join == true if you must join an existing transaction.
3008  * join == false if you can deal with waiting for others to finish
3009  *
3010  * this will block until the transaction is joinable.  send the number of
3011  * blocks you expect to use in nblocks.
3012 */
3013 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3014                               struct super_block *sb, unsigned long nblocks,
3015                               int join)
3016 {
3017         time64_t now = ktime_get_seconds();
3018         unsigned int old_trans_id;
3019         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3020         struct reiserfs_transaction_handle myth;
3021         int sched_count = 0;
3022         int retval;
3023         int depth;
3024
3025         reiserfs_check_lock_depth(sb, "journal_begin");
3026         BUG_ON(nblocks > journal->j_trans_max);
3027
3028         PROC_INFO_INC(sb, journal.journal_being);
3029         /* set here for journal_join */
3030         th->t_refcount = 1;
3031         th->t_super = sb;
3032
3033 relock:
3034         lock_journal(sb);
3035         if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3036                 unlock_journal(sb);
3037                 retval = journal->j_errno;
3038                 goto out_fail;
3039         }
3040         journal->j_bcount++;
3041
3042         if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3043                 unlock_journal(sb);
3044                 depth = reiserfs_write_unlock_nested(sb);
3045                 reiserfs_wait_on_write_block(sb);
3046                 reiserfs_write_lock_nested(sb, depth);
3047                 PROC_INFO_INC(sb, journal.journal_relock_writers);
3048                 goto relock;
3049         }
3050         now = ktime_get_seconds();
3051
3052         /*
3053          * if there is no room in the journal OR
3054          * if this transaction is too old, and we weren't called joinable,
3055          * wait for it to finish before beginning we don't sleep if there
3056          * aren't other writers
3057          */
3058
3059         if ((!join && journal->j_must_wait > 0) ||
3060             (!join
3061              && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3062             || (!join && atomic_read(&journal->j_wcount) > 0
3063                 && journal->j_trans_start_time > 0
3064                 && (now - journal->j_trans_start_time) >
3065                 journal->j_max_trans_age) || (!join
3066                                               && atomic_read(&journal->j_jlock))
3067             || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3068
3069                 old_trans_id = journal->j_trans_id;
3070                 /* allow others to finish this transaction */
3071                 unlock_journal(sb);
3072
3073                 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3074                     journal->j_max_batch &&
3075                     ((journal->j_len + nblocks + 2) * 100) <
3076                     (journal->j_len_alloc * 75)) {
3077                         if (atomic_read(&journal->j_wcount) > 10) {
3078                                 sched_count++;
3079                                 queue_log_writer(sb);
3080                                 goto relock;
3081                         }
3082                 }
3083                 /*
3084                  * don't mess with joining the transaction if all we
3085                  * have to do is wait for someone else to do a commit
3086                  */
3087                 if (atomic_read(&journal->j_jlock)) {
3088                         while (journal->j_trans_id == old_trans_id &&
3089                                atomic_read(&journal->j_jlock)) {
3090                                 queue_log_writer(sb);
3091                         }
3092                         goto relock;
3093                 }
3094                 retval = journal_join(&myth, sb);
3095                 if (retval)
3096                         goto out_fail;
3097
3098                 /* someone might have ended the transaction while we joined */
3099                 if (old_trans_id != journal->j_trans_id) {
3100                         retval = do_journal_end(&myth, 0);
3101                 } else {
3102                         retval = do_journal_end(&myth, COMMIT_NOW);
3103                 }
3104
3105                 if (retval)
3106                         goto out_fail;
3107
3108                 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3109                 goto relock;
3110         }
3111         /* we are the first writer, set trans_id */
3112         if (journal->j_trans_start_time == 0) {
3113                 journal->j_trans_start_time = ktime_get_seconds();
3114         }
3115         atomic_inc(&journal->j_wcount);
3116         journal->j_len_alloc += nblocks;
3117         th->t_blocks_logged = 0;
3118         th->t_blocks_allocated = nblocks;
3119         th->t_trans_id = journal->j_trans_id;
3120         unlock_journal(sb);
3121         INIT_LIST_HEAD(&th->t_list);
3122         return 0;
3123
3124 out_fail:
3125         memset(th, 0, sizeof(*th));
3126         /*
3127          * Re-set th->t_super, so we can properly keep track of how many
3128          * persistent transactions there are. We need to do this so if this
3129          * call is part of a failed restart_transaction, we can free it later
3130          */
3131         th->t_super = sb;
3132         return retval;
3133 }
3134
3135 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3136                                                                     super_block
3137                                                                     *s,
3138                                                                     int nblocks)
3139 {
3140         int ret;
3141         struct reiserfs_transaction_handle *th;
3142
3143         /*
3144          * if we're nesting into an existing transaction.  It will be
3145          * persistent on its own
3146          */
3147         if (reiserfs_transaction_running(s)) {
3148                 th = current->journal_info;
3149                 th->t_refcount++;
3150                 BUG_ON(th->t_refcount < 2);
3151
3152                 return th;
3153         }
3154         th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3155         if (!th)
3156                 return NULL;
3157         ret = journal_begin(th, s, nblocks);
3158         if (ret) {
3159                 kfree(th);
3160                 return NULL;
3161         }
3162
3163         SB_JOURNAL(s)->j_persistent_trans++;
3164         return th;
3165 }
3166
3167 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3168 {
3169         struct super_block *s = th->t_super;
3170         int ret = 0;
3171         if (th->t_trans_id)
3172                 ret = journal_end(th);
3173         else
3174                 ret = -EIO;
3175         if (th->t_refcount == 0) {
3176                 SB_JOURNAL(s)->j_persistent_trans--;
3177                 kfree(th);
3178         }
3179         return ret;
3180 }
3181
3182 static int journal_join(struct reiserfs_transaction_handle *th,
3183                         struct super_block *sb)
3184 {
3185         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3186
3187         /*
3188          * this keeps do_journal_end from NULLing out the
3189          * current->journal_info pointer
3190          */
3191         th->t_handle_save = cur_th;
3192         BUG_ON(cur_th && cur_th->t_refcount > 1);
3193         return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3194 }
3195
3196 int journal_join_abort(struct reiserfs_transaction_handle *th,
3197                        struct super_block *sb)
3198 {
3199         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3200
3201         /*
3202          * this keeps do_journal_end from NULLing out the
3203          * current->journal_info pointer
3204          */
3205         th->t_handle_save = cur_th;
3206         BUG_ON(cur_th && cur_th->t_refcount > 1);
3207         return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3208 }
3209
3210 int journal_begin(struct reiserfs_transaction_handle *th,
3211                   struct super_block *sb, unsigned long nblocks)
3212 {
3213         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3214         int ret;
3215
3216         th->t_handle_save = NULL;
3217         if (cur_th) {
3218                 /* we are nesting into the current transaction */
3219                 if (cur_th->t_super == sb) {
3220                         BUG_ON(!cur_th->t_refcount);
3221                         cur_th->t_refcount++;
3222                         memcpy(th, cur_th, sizeof(*th));
3223                         if (th->t_refcount <= 1)
3224                                 reiserfs_warning(sb, "reiserfs-2005",
3225                                                  "BAD: refcount <= 1, but "
3226                                                  "journal_info != 0");
3227                         return 0;
3228                 } else {
3229                         /*
3230                          * we've ended up with a handle from a different
3231                          * filesystem.  save it and restore on journal_end.
3232                          * This should never really happen...
3233                          */
3234                         reiserfs_warning(sb, "clm-2100",
3235                                          "nesting info a different FS");
3236                         th->t_handle_save = current->journal_info;
3237                         current->journal_info = th;
3238                 }
3239         } else {
3240                 current->journal_info = th;
3241         }
3242         ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3243         BUG_ON(current->journal_info != th);
3244
3245         /*
3246          * I guess this boils down to being the reciprocal of clm-2100 above.
3247          * If do_journal_begin_r fails, we need to put it back, since
3248          * journal_end won't be called to do it. */
3249         if (ret)
3250                 current->journal_info = th->t_handle_save;
3251         else
3252                 BUG_ON(!th->t_refcount);
3253
3254         return ret;
3255 }
3256
3257 /*
3258  * puts bh into the current transaction.  If it was already there, reorders
3259  * removes the old pointers from the hash, and puts new ones in (to make
3260  * sure replay happen in the right order).
3261  *
3262  * if it was dirty, cleans and files onto the clean list.  I can't let it
3263  * be dirty again until the transaction is committed.
3264  *
3265  * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3266  */
3267 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3268                        struct buffer_head *bh)
3269 {
3270         struct super_block *sb = th->t_super;
3271         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3272         struct reiserfs_journal_cnode *cn = NULL;
3273         int count_already_incd = 0;
3274         int prepared = 0;
3275         BUG_ON(!th->t_trans_id);
3276
3277         PROC_INFO_INC(sb, journal.mark_dirty);
3278         if (th->t_trans_id != journal->j_trans_id) {
3279                 reiserfs_panic(th->t_super, "journal-1577",
3280                                "handle trans id %ld != current trans id %ld",
3281                                th->t_trans_id, journal->j_trans_id);
3282         }
3283
3284         prepared = test_clear_buffer_journal_prepared(bh);
3285         clear_buffer_journal_restore_dirty(bh);
3286         /* already in this transaction, we are done */
3287         if (buffer_journaled(bh)) {
3288                 PROC_INFO_INC(sb, journal.mark_dirty_already);
3289                 return 0;
3290         }
3291
3292         /*
3293          * this must be turned into a panic instead of a warning.  We can't
3294          * allow a dirty or journal_dirty or locked buffer to be logged, as
3295          * some changes could get to disk too early.  NOT GOOD.
3296          */
3297         if (!prepared || buffer_dirty(bh)) {
3298                 reiserfs_warning(sb, "journal-1777",
3299                                  "buffer %llu bad state "
3300                                  "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3301                                  (unsigned long long)bh->b_blocknr,
3302                                  prepared ? ' ' : '!',
3303                                  buffer_locked(bh) ? ' ' : '!',
3304                                  buffer_dirty(bh) ? ' ' : '!',
3305                                  buffer_journal_dirty(bh) ? ' ' : '!');
3306         }
3307
3308         if (atomic_read(&journal->j_wcount) <= 0) {
3309                 reiserfs_warning(sb, "journal-1409",
3310                                  "returning because j_wcount was %d",
3311                                  atomic_read(&journal->j_wcount));
3312                 return 1;
3313         }
3314         /*
3315          * this error means I've screwed up, and we've overflowed
3316          * the transaction.  Nothing can be done here, except make the
3317          * FS readonly or panic.
3318          */
3319         if (journal->j_len >= journal->j_trans_max) {
3320                 reiserfs_panic(th->t_super, "journal-1413",
3321                                "j_len (%lu) is too big",
3322                                journal->j_len);
3323         }
3324
3325         if (buffer_journal_dirty(bh)) {
3326                 count_already_incd = 1;
3327                 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3328                 clear_buffer_journal_dirty(bh);
3329         }
3330
3331         if (journal->j_len > journal->j_len_alloc) {
3332                 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3333         }
3334
3335         set_buffer_journaled(bh);
3336
3337         /* now put this guy on the end */
3338         if (!cn) {
3339                 cn = get_cnode(sb);
3340                 if (!cn) {
3341                         reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3342                 }
3343
3344                 if (th->t_blocks_logged == th->t_blocks_allocated) {
3345                         th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3346                         journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3347                 }
3348                 th->t_blocks_logged++;
3349                 journal->j_len++;
3350
3351                 cn->bh = bh;
3352                 cn->blocknr = bh->b_blocknr;
3353                 cn->sb = sb;
3354                 cn->jlist = NULL;
3355                 insert_journal_hash(journal->j_hash_table, cn);
3356                 if (!count_already_incd) {
3357                         get_bh(bh);
3358                 }
3359         }
3360         cn->next = NULL;
3361         cn->prev = journal->j_last;
3362         cn->bh = bh;
3363         if (journal->j_last) {
3364                 journal->j_last->next = cn;
3365                 journal->j_last = cn;
3366         } else {
3367                 journal->j_first = cn;
3368                 journal->j_last = cn;
3369         }
3370         reiserfs_schedule_old_flush(sb);
3371         return 0;
3372 }
3373
3374 int journal_end(struct reiserfs_transaction_handle *th)
3375 {
3376         struct super_block *sb = th->t_super;
3377         if (!current->journal_info && th->t_refcount > 1)
3378                 reiserfs_warning(sb, "REISER-NESTING",
3379                                  "th NULL, refcount %d", th->t_refcount);
3380
3381         if (!th->t_trans_id) {
3382                 WARN_ON(1);
3383                 return -EIO;
3384         }
3385
3386         th->t_refcount--;
3387         if (th->t_refcount > 0) {
3388                 struct reiserfs_transaction_handle *cur_th =
3389                     current->journal_info;
3390
3391                 /*
3392                  * we aren't allowed to close a nested transaction on a
3393                  * different filesystem from the one in the task struct
3394                  */
3395                 BUG_ON(cur_th->t_super != th->t_super);
3396
3397                 if (th != cur_th) {
3398                         memcpy(current->journal_info, th, sizeof(*th));
3399                         th->t_trans_id = 0;
3400                 }
3401                 return 0;
3402         } else {
3403                 return do_journal_end(th, 0);
3404         }
3405 }
3406
3407 /*
3408  * removes from the current transaction, relsing and descrementing any counters.
3409  * also files the removed buffer directly onto the clean list
3410  *
3411  * called by journal_mark_freed when a block has been deleted
3412  *
3413  * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3414  */
3415 static int remove_from_transaction(struct super_block *sb,
3416                                    b_blocknr_t blocknr, int already_cleaned)
3417 {
3418         struct buffer_head *bh;
3419         struct reiserfs_journal_cnode *cn;
3420         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3421         int ret = 0;
3422
3423         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3424         if (!cn || !cn->bh) {
3425                 return ret;
3426         }
3427         bh = cn->bh;
3428         if (cn->prev) {
3429                 cn->prev->next = cn->next;
3430         }
3431         if (cn->next) {
3432                 cn->next->prev = cn->prev;
3433         }
3434         if (cn == journal->j_first) {
3435                 journal->j_first = cn->next;
3436         }
3437         if (cn == journal->j_last) {
3438                 journal->j_last = cn->prev;
3439         }
3440         remove_journal_hash(sb, journal->j_hash_table, NULL,
3441                             bh->b_blocknr, 0);
3442         clear_buffer_journaled(bh);     /* don't log this one */
3443
3444         if (!already_cleaned) {
3445                 clear_buffer_journal_dirty(bh);
3446                 clear_buffer_dirty(bh);
3447                 clear_buffer_journal_test(bh);
3448                 put_bh(bh);
3449                 if (atomic_read(&bh->b_count) < 0) {
3450                         reiserfs_warning(sb, "journal-1752",
3451                                          "b_count < 0");
3452                 }
3453                 ret = 1;
3454         }
3455         journal->j_len--;
3456         journal->j_len_alloc--;
3457         free_cnode(sb, cn);
3458         return ret;
3459 }
3460
3461 /*
3462  * for any cnode in a journal list, it can only be dirtied of all the
3463  * transactions that include it are committed to disk.
3464  * this checks through each transaction, and returns 1 if you are allowed
3465  * to dirty, and 0 if you aren't
3466  *
3467  * it is called by dirty_journal_list, which is called after
3468  * flush_commit_list has gotten all the log blocks for a given
3469  * transaction on disk
3470  *
3471  */
3472 static int can_dirty(struct reiserfs_journal_cnode *cn)
3473 {
3474         struct super_block *sb = cn->sb;
3475         b_blocknr_t blocknr = cn->blocknr;
3476         struct reiserfs_journal_cnode *cur = cn->hprev;
3477         int can_dirty = 1;
3478
3479         /*
3480          * first test hprev.  These are all newer than cn, so any node here
3481          * with the same block number and dev means this node can't be sent
3482          * to disk right now.
3483          */
3484         while (cur && can_dirty) {
3485                 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3486                     cur->blocknr == blocknr) {
3487                         can_dirty = 0;
3488                 }
3489                 cur = cur->hprev;
3490         }
3491         /*
3492          * then test hnext.  These are all older than cn.  As long as they
3493          * are committed to the log, it is safe to write cn to disk
3494          */
3495         cur = cn->hnext;
3496         while (cur && can_dirty) {
3497                 if (cur->jlist && cur->jlist->j_len > 0 &&
3498                     atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3499                     cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3500                         can_dirty = 0;
3501                 }
3502                 cur = cur->hnext;
3503         }
3504         return can_dirty;
3505 }
3506
3507 /*
3508  * syncs the commit blocks, but does not force the real buffers to disk
3509  * will wait until the current transaction is done/committed before returning
3510  */
3511 int journal_end_sync(struct reiserfs_transaction_handle *th)
3512 {
3513         struct super_block *sb = th->t_super;
3514         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3515
3516         BUG_ON(!th->t_trans_id);
3517         /* you can sync while nested, very, very bad */
3518         BUG_ON(th->t_refcount > 1);
3519         if (journal->j_len == 0) {
3520                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3521                                              1);
3522                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3523         }
3524         return do_journal_end(th, COMMIT_NOW | WAIT);
3525 }
3526
3527 /* writeback the pending async commits to disk */
3528 static void flush_async_commits(struct work_struct *work)
3529 {
3530         struct reiserfs_journal *journal =
3531                 container_of(work, struct reiserfs_journal, j_work.work);
3532         struct super_block *sb = journal->j_work_sb;
3533         struct reiserfs_journal_list *jl;
3534         struct list_head *entry;
3535
3536         reiserfs_write_lock(sb);
3537         if (!list_empty(&journal->j_journal_list)) {
3538                 /* last entry is the youngest, commit it and you get everything */
3539                 entry = journal->j_journal_list.prev;
3540                 jl = JOURNAL_LIST_ENTRY(entry);
3541                 flush_commit_list(sb, jl, 1);
3542         }
3543         reiserfs_write_unlock(sb);
3544 }
3545
3546 /*
3547  * flushes any old transactions to disk
3548  * ends the current transaction if it is too old
3549  */
3550 void reiserfs_flush_old_commits(struct super_block *sb)
3551 {
3552         time64_t now;
3553         struct reiserfs_transaction_handle th;
3554         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3555
3556         now = ktime_get_seconds();
3557         /*
3558          * safety check so we don't flush while we are replaying the log during
3559          * mount
3560          */
3561         if (list_empty(&journal->j_journal_list))
3562                 return;
3563
3564         /*
3565          * check the current transaction.  If there are no writers, and it is
3566          * too old, finish it, and force the commit blocks to disk
3567          */
3568         if (atomic_read(&journal->j_wcount) <= 0 &&
3569             journal->j_trans_start_time > 0 &&
3570             journal->j_len > 0 &&
3571             (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3572                 if (!journal_join(&th, sb)) {
3573                         reiserfs_prepare_for_journal(sb,
3574                                                      SB_BUFFER_WITH_SB(sb),
3575                                                      1);
3576                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3577
3578                         /*
3579                          * we're only being called from kreiserfsd, it makes
3580                          * no sense to do an async commit so that kreiserfsd
3581                          * can do it later
3582                          */
3583                         do_journal_end(&th, COMMIT_NOW | WAIT);
3584                 }
3585         }
3586 }
3587
3588 /*
3589  * returns 0 if do_journal_end should return right away, returns 1 if
3590  * do_journal_end should finish the commit
3591  *
3592  * if the current transaction is too old, but still has writers, this will
3593  * wait on j_join_wait until all the writers are done.  By the time it
3594  * wakes up, the transaction it was called has already ended, so it just
3595  * flushes the commit list and returns 0.
3596  *
3597  * Won't batch when flush or commit_now is set.  Also won't batch when
3598  * others are waiting on j_join_wait.
3599  *
3600  * Note, we can't allow the journal_end to proceed while there are still
3601  * writers in the log.
3602  */
3603 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3604 {
3605
3606         time64_t now;
3607         int flush = flags & FLUSH_ALL;
3608         int commit_now = flags & COMMIT_NOW;
3609         int wait_on_commit = flags & WAIT;
3610         struct reiserfs_journal_list *jl;
3611         struct super_block *sb = th->t_super;
3612         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3613
3614         BUG_ON(!th->t_trans_id);
3615
3616         if (th->t_trans_id != journal->j_trans_id) {
3617                 reiserfs_panic(th->t_super, "journal-1577",
3618                                "handle trans id %ld != current trans id %ld",
3619                                th->t_trans_id, journal->j_trans_id);
3620         }
3621
3622         journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3623         /* <= 0 is allowed.  unmounting might not call begin */
3624         if (atomic_read(&journal->j_wcount) > 0)
3625                 atomic_dec(&journal->j_wcount);
3626
3627         /*
3628          * BUG, deal with case where j_len is 0, but people previously
3629          * freed blocks need to be released will be dealt with by next
3630          * transaction that actually writes something, but should be taken
3631          * care of in this trans
3632          */
3633         BUG_ON(journal->j_len == 0);
3634
3635         /*
3636          * if wcount > 0, and we are called to with flush or commit_now,
3637          * we wait on j_join_wait.  We will wake up when the last writer has
3638          * finished the transaction, and started it on its way to the disk.
3639          * Then, we flush the commit or journal list, and just return 0
3640          * because the rest of journal end was already done for this
3641          * transaction.
3642          */
3643         if (atomic_read(&journal->j_wcount) > 0) {
3644                 if (flush || commit_now) {
3645                         unsigned trans_id;
3646
3647                         jl = journal->j_current_jl;
3648                         trans_id = jl->j_trans_id;
3649                         if (wait_on_commit)
3650                                 jl->j_state |= LIST_COMMIT_PENDING;
3651                         atomic_set(&journal->j_jlock, 1);
3652                         if (flush) {
3653                                 journal->j_next_full_flush = 1;
3654                         }
3655                         unlock_journal(sb);
3656
3657                         /*
3658                          * sleep while the current transaction is
3659                          * still j_jlocked
3660                          */
3661                         while (journal->j_trans_id == trans_id) {
3662                                 if (atomic_read(&journal->j_jlock)) {
3663                                         queue_log_writer(sb);
3664                                 } else {
3665                                         lock_journal(sb);
3666                                         if (journal->j_trans_id == trans_id) {
3667                                                 atomic_set(&journal->j_jlock,
3668                                                            1);
3669                                         }
3670                                         unlock_journal(sb);
3671                                 }
3672                         }
3673                         BUG_ON(journal->j_trans_id == trans_id);
3674
3675                         if (commit_now
3676                             && journal_list_still_alive(sb, trans_id)
3677                             && wait_on_commit) {
3678                                 flush_commit_list(sb, jl, 1);
3679                         }
3680                         return 0;
3681                 }
3682                 unlock_journal(sb);
3683                 return 0;
3684         }
3685
3686         /* deal with old transactions where we are the last writers */
3687         now = ktime_get_seconds();
3688         if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3689                 commit_now = 1;
3690                 journal->j_next_async_flush = 1;
3691         }
3692         /* don't batch when someone is waiting on j_join_wait */
3693         /* don't batch when syncing the commit or flushing the whole trans */
3694         if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3695             && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3696             && journal->j_len_alloc < journal->j_max_batch
3697             && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3698                 journal->j_bcount++;
3699                 unlock_journal(sb);
3700                 return 0;
3701         }
3702
3703         if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3704                 reiserfs_panic(sb, "journal-003",
3705                                "j_start (%ld) is too high",
3706                                journal->j_start);
3707         }
3708         return 1;
3709 }
3710
3711 /*
3712  * Does all the work that makes deleting blocks safe.
3713  * when deleting a block mark BH_JNew, just remove it from the current
3714  * transaction, clean it's buffer_head and move on.
3715  *
3716  * otherwise:
3717  * set a bit for the block in the journal bitmap.  That will prevent it from
3718  * being allocated for unformatted nodes before this transaction has finished.
3719  *
3720  * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3721  * That will prevent any old transactions with this block from trying to flush
3722  * to the real location.  Since we aren't removing the cnode from the
3723  * journal_list_hash, *the block can't be reallocated yet.
3724  *
3725  * Then remove it from the current transaction, decrementing any counters and
3726  * filing it on the clean list.
3727  */
3728 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3729                        struct super_block *sb, b_blocknr_t blocknr)
3730 {
3731         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3732         struct reiserfs_journal_cnode *cn = NULL;
3733         struct buffer_head *bh = NULL;
3734         struct reiserfs_list_bitmap *jb = NULL;
3735         int cleaned = 0;
3736         BUG_ON(!th->t_trans_id);
3737
3738         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3739         if (cn && cn->bh) {
3740                 bh = cn->bh;
3741                 get_bh(bh);
3742         }
3743         /* if it is journal new, we just remove it from this transaction */
3744         if (bh && buffer_journal_new(bh)) {
3745                 clear_buffer_journal_new(bh);
3746                 clear_prepared_bits(bh);
3747                 reiserfs_clean_and_file_buffer(bh);
3748                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3749         } else {
3750                 /*
3751                  * set the bit for this block in the journal bitmap
3752                  * for this transaction
3753                  */
3754                 jb = journal->j_current_jl->j_list_bitmap;
3755                 if (!jb) {
3756                         reiserfs_panic(sb, "journal-1702",
3757                                        "journal_list_bitmap is NULL");
3758                 }
3759                 set_bit_in_list_bitmap(sb, blocknr, jb);
3760
3761                 /* Note, the entire while loop is not allowed to schedule.  */
3762
3763                 if (bh) {
3764                         clear_prepared_bits(bh);
3765                         reiserfs_clean_and_file_buffer(bh);
3766                 }
3767                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3768
3769                 /*
3770                  * find all older transactions with this block,
3771                  * make sure they don't try to write it out
3772                  */
3773                 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3774                                           blocknr);
3775                 while (cn) {
3776                         if (sb == cn->sb && blocknr == cn->blocknr) {
3777                                 set_bit(BLOCK_FREED, &cn->state);
3778                                 if (cn->bh) {
3779                                         /*
3780                                          * remove_from_transaction will brelse
3781                                          * the buffer if it was in the current
3782                                          * trans
3783                                          */
3784                                         if (!cleaned) {
3785                                                 clear_buffer_journal_dirty(cn->
3786                                                                            bh);
3787                                                 clear_buffer_dirty(cn->bh);
3788                                                 clear_buffer_journal_test(cn->
3789                                                                           bh);
3790                                                 cleaned = 1;
3791                                                 put_bh(cn->bh);
3792                                                 if (atomic_read
3793                                                     (&cn->bh->b_count) < 0) {
3794                                                         reiserfs_warning(sb,
3795                                                                  "journal-2138",
3796                                                                  "cn->bh->b_count < 0");
3797                                                 }
3798                                         }
3799                                         /*
3800                                          * since we are clearing the bh,
3801                                          * we MUST dec nonzerolen
3802                                          */
3803                                         if (cn->jlist) {
3804                                                 atomic_dec(&cn->jlist->
3805                                                            j_nonzerolen);
3806                                         }
3807                                         cn->bh = NULL;
3808                                 }
3809                         }
3810                         cn = cn->hnext;
3811                 }
3812         }
3813
3814         if (bh)
3815                 release_buffer_page(bh); /* get_hash grabs the buffer */
3816         return 0;
3817 }
3818
3819 void reiserfs_update_inode_transaction(struct inode *inode)
3820 {
3821         struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3822         REISERFS_I(inode)->i_jl = journal->j_current_jl;
3823         REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3824 }
3825
3826 /*
3827  * returns -1 on error, 0 if no commits/barriers were done and 1
3828  * if a transaction was actually committed and the barrier was done
3829  */
3830 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3831                              struct reiserfs_journal_list *jl)
3832 {
3833         struct reiserfs_transaction_handle th;
3834         struct super_block *sb = inode->i_sb;
3835         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3836         int ret = 0;
3837
3838         /*
3839          * is it from the current transaction,
3840          * or from an unknown transaction?
3841          */
3842         if (id == journal->j_trans_id) {
3843                 jl = journal->j_current_jl;
3844                 /*
3845                  * try to let other writers come in and
3846                  * grow this transaction
3847                  */
3848                 let_transaction_grow(sb, id);
3849                 if (journal->j_trans_id != id) {
3850                         goto flush_commit_only;
3851                 }
3852
3853                 ret = journal_begin(&th, sb, 1);
3854                 if (ret)
3855                         return ret;
3856
3857                 /* someone might have ended this transaction while we joined */
3858                 if (journal->j_trans_id != id) {
3859                         reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3860                                                      1);
3861                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3862                         ret = journal_end(&th);
3863                         goto flush_commit_only;
3864                 }
3865
3866                 ret = journal_end_sync(&th);
3867                 if (!ret)
3868                         ret = 1;
3869
3870         } else {
3871                 /*
3872                  * this gets tricky, we have to make sure the journal list in
3873                  * the inode still exists.  We know the list is still around
3874                  * if we've got a larger transaction id than the oldest list
3875                  */
3876 flush_commit_only:
3877                 if (journal_list_still_alive(inode->i_sb, id)) {
3878                         /*
3879                          * we only set ret to 1 when we know for sure
3880                          * the barrier hasn't been started yet on the commit
3881                          * block.
3882                          */
3883                         if (atomic_read(&jl->j_commit_left) > 1)
3884                                 ret = 1;
3885                         flush_commit_list(sb, jl, 1);
3886                         if (journal->j_errno)
3887                                 ret = journal->j_errno;
3888                 }
3889         }
3890         /* otherwise the list is gone, and long since committed */
3891         return ret;
3892 }
3893
3894 int reiserfs_commit_for_inode(struct inode *inode)
3895 {
3896         unsigned int id = REISERFS_I(inode)->i_trans_id;
3897         struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3898
3899         /*
3900          * for the whole inode, assume unset id means it was
3901          * changed in the current transaction.  More conservative
3902          */
3903         if (!id || !jl) {
3904                 reiserfs_update_inode_transaction(inode);
3905                 id = REISERFS_I(inode)->i_trans_id;
3906                 /* jl will be updated in __commit_trans_jl */
3907         }
3908
3909         return __commit_trans_jl(inode, id, jl);
3910 }
3911
3912 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3913                                       struct buffer_head *bh)
3914 {
3915         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3916         PROC_INFO_INC(sb, journal.restore_prepared);
3917         if (!bh) {
3918                 return;
3919         }
3920         if (test_clear_buffer_journal_restore_dirty(bh) &&
3921             buffer_journal_dirty(bh)) {
3922                 struct reiserfs_journal_cnode *cn;
3923                 reiserfs_write_lock(sb);
3924                 cn = get_journal_hash_dev(sb,
3925                                           journal->j_list_hash_table,
3926                                           bh->b_blocknr);
3927                 if (cn && can_dirty(cn)) {
3928                         set_buffer_journal_test(bh);
3929                         mark_buffer_dirty(bh);
3930                 }
3931                 reiserfs_write_unlock(sb);
3932         }
3933         clear_buffer_journal_prepared(bh);
3934 }
3935
3936 extern struct tree_balance *cur_tb;
3937 /*
3938  * before we can change a metadata block, we have to make sure it won't
3939  * be written to disk while we are altering it.  So, we must:
3940  * clean it
3941  * wait on it.
3942  */
3943 int reiserfs_prepare_for_journal(struct super_block *sb,
3944                                  struct buffer_head *bh, int wait)
3945 {
3946         PROC_INFO_INC(sb, journal.prepare);
3947
3948         if (!trylock_buffer(bh)) {
3949                 if (!wait)
3950                         return 0;
3951                 lock_buffer(bh);
3952         }
3953         set_buffer_journal_prepared(bh);
3954         if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3955                 clear_buffer_journal_test(bh);
3956                 set_buffer_journal_restore_dirty(bh);
3957         }
3958         unlock_buffer(bh);
3959         return 1;
3960 }
3961
3962 /*
3963  * long and ugly.  If flush, will not return until all commit
3964  * blocks and all real buffers in the trans are on disk.
3965  * If no_async, won't return until all commit blocks are on disk.
3966  *
3967  * keep reading, there are comments as you go along
3968  *
3969  * If the journal is aborted, we just clean up. Things like flushing
3970  * journal lists, etc just won't happen.
3971  */
3972 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3973 {
3974         struct super_block *sb = th->t_super;
3975         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3976         struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3977         struct reiserfs_journal_cnode *last_cn = NULL;
3978         struct reiserfs_journal_desc *desc;
3979         struct reiserfs_journal_commit *commit;
3980         struct buffer_head *c_bh;       /* commit bh */
3981         struct buffer_head *d_bh;       /* desc bh */
3982         int cur_write_start = 0;        /* start index of current log write */
3983         int i;
3984         int flush;
3985         int wait_on_commit;
3986         struct reiserfs_journal_list *jl, *temp_jl;
3987         struct list_head *entry, *safe;
3988         unsigned long jindex;
3989         unsigned int commit_trans_id;
3990         int trans_half;
3991         int depth;
3992
3993         BUG_ON(th->t_refcount > 1);
3994         BUG_ON(!th->t_trans_id);
3995         BUG_ON(!th->t_super);
3996
3997         /*
3998          * protect flush_older_commits from doing mistakes if the
3999          * transaction ID counter gets overflowed.
4000          */
4001         if (th->t_trans_id == ~0U)
4002                 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4003         flush = flags & FLUSH_ALL;
4004         wait_on_commit = flags & WAIT;
4005
4006         current->journal_info = th->t_handle_save;
4007         reiserfs_check_lock_depth(sb, "journal end");
4008         if (journal->j_len == 0) {
4009                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4010                                              1);
4011                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4012         }
4013
4014         lock_journal(sb);
4015         if (journal->j_next_full_flush) {
4016                 flags |= FLUSH_ALL;
4017                 flush = 1;
4018         }
4019         if (journal->j_next_async_flush) {
4020                 flags |= COMMIT_NOW | WAIT;
4021                 wait_on_commit = 1;
4022         }
4023
4024         /*
4025          * check_journal_end locks the journal, and unlocks if it does
4026          * not return 1 it tells us if we should continue with the
4027          * journal_end, or just return
4028          */
4029         if (!check_journal_end(th, flags)) {
4030                 reiserfs_schedule_old_flush(sb);
4031                 wake_queued_writers(sb);
4032                 reiserfs_async_progress_wait(sb);
4033                 goto out;
4034         }
4035
4036         /* check_journal_end might set these, check again */
4037         if (journal->j_next_full_flush) {
4038                 flush = 1;
4039         }
4040
4041         /*
4042          * j must wait means we have to flush the log blocks, and the
4043          * real blocks for this transaction
4044          */
4045         if (journal->j_must_wait > 0) {
4046                 flush = 1;
4047         }
4048 #ifdef REISERFS_PREALLOCATE
4049         /*
4050          * quota ops might need to nest, setup the journal_info pointer
4051          * for them and raise the refcount so that it is > 0.
4052          */
4053         current->journal_info = th;
4054         th->t_refcount++;
4055
4056         /* it should not involve new blocks into the transaction */
4057         reiserfs_discard_all_prealloc(th);
4058
4059         th->t_refcount--;
4060         current->journal_info = th->t_handle_save;
4061 #endif
4062
4063         /* setup description block */
4064         d_bh =
4065             journal_getblk(sb,
4066                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4067                            journal->j_start);
4068         set_buffer_uptodate(d_bh);
4069         desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4070         memset(d_bh->b_data, 0, d_bh->b_size);
4071         memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4072         set_desc_trans_id(desc, journal->j_trans_id);
4073
4074         /*
4075          * setup commit block.  Don't write (keep it clean too) this one
4076          * until after everyone else is written
4077          */
4078         c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4079                               ((journal->j_start + journal->j_len +
4080                                 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4081         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4082         memset(c_bh->b_data, 0, c_bh->b_size);
4083         set_commit_trans_id(commit, journal->j_trans_id);
4084         set_buffer_uptodate(c_bh);
4085
4086         /* init this journal list */
4087         jl = journal->j_current_jl;
4088
4089         /*
4090          * we lock the commit before doing anything because
4091          * we want to make sure nobody tries to run flush_commit_list until
4092          * the new transaction is fully setup, and we've already flushed the
4093          * ordered bh list
4094          */
4095         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4096
4097         /* save the transaction id in case we need to commit it later */
4098         commit_trans_id = jl->j_trans_id;
4099
4100         atomic_set(&jl->j_older_commits_done, 0);
4101         jl->j_trans_id = journal->j_trans_id;
4102         jl->j_timestamp = journal->j_trans_start_time;
4103         jl->j_commit_bh = c_bh;
4104         jl->j_start = journal->j_start;
4105         jl->j_len = journal->j_len;
4106         atomic_set(&jl->j_nonzerolen, journal->j_len);
4107         atomic_set(&jl->j_commit_left, journal->j_len + 2);
4108         jl->j_realblock = NULL;
4109
4110         /*
4111          * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4112          * for each real block, add it to the journal list hash,
4113          * copy into real block index array in the commit or desc block
4114          */
4115         trans_half = journal_trans_half(sb->s_blocksize);
4116         for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4117                 if (buffer_journaled(cn->bh)) {
4118                         jl_cn = get_cnode(sb);
4119                         if (!jl_cn) {
4120                                 reiserfs_panic(sb, "journal-1676",
4121                                                "get_cnode returned NULL");
4122                         }
4123                         if (i == 0) {
4124                                 jl->j_realblock = jl_cn;
4125                         }
4126                         jl_cn->prev = last_cn;
4127                         jl_cn->next = NULL;
4128                         if (last_cn) {
4129                                 last_cn->next = jl_cn;
4130                         }
4131                         last_cn = jl_cn;
4132                         /*
4133                          * make sure the block we are trying to log
4134                          * is not a block of journal or reserved area
4135                          */
4136                         if (is_block_in_log_or_reserved_area
4137                             (sb, cn->bh->b_blocknr)) {
4138                                 reiserfs_panic(sb, "journal-2332",
4139                                                "Trying to log block %lu, "
4140                                                "which is a log block",
4141                                                cn->bh->b_blocknr);
4142                         }
4143                         jl_cn->blocknr = cn->bh->b_blocknr;
4144                         jl_cn->state = 0;
4145                         jl_cn->sb = sb;
4146                         jl_cn->bh = cn->bh;
4147                         jl_cn->jlist = jl;
4148                         insert_journal_hash(journal->j_list_hash_table, jl_cn);
4149                         if (i < trans_half) {
4150                                 desc->j_realblock[i] =
4151                                     cpu_to_le32(cn->bh->b_blocknr);
4152                         } else {
4153                                 commit->j_realblock[i - trans_half] =
4154                                     cpu_to_le32(cn->bh->b_blocknr);
4155                         }
4156                 } else {
4157                         i--;
4158                 }
4159         }
4160         set_desc_trans_len(desc, journal->j_len);
4161         set_desc_mount_id(desc, journal->j_mount_id);
4162         set_desc_trans_id(desc, journal->j_trans_id);
4163         set_commit_trans_len(commit, journal->j_len);
4164
4165         /*
4166          * special check in case all buffers in the journal
4167          * were marked for not logging
4168          */
4169         BUG_ON(journal->j_len == 0);
4170
4171         /*
4172          * we're about to dirty all the log blocks, mark the description block
4173          * dirty now too.  Don't mark the commit block dirty until all the
4174          * others are on disk
4175          */
4176         mark_buffer_dirty(d_bh);
4177
4178         /*
4179          * first data block is j_start + 1, so add one to
4180          * cur_write_start wherever you use it
4181          */
4182         cur_write_start = journal->j_start;
4183         cn = journal->j_first;
4184         jindex = 1;     /* start at one so we don't get the desc again */
4185         while (cn) {
4186                 clear_buffer_journal_new(cn->bh);
4187                 /* copy all the real blocks into log area.  dirty log blocks */
4188                 if (buffer_journaled(cn->bh)) {
4189                         struct buffer_head *tmp_bh;
4190                         char *addr;
4191                         struct page *page;
4192                         tmp_bh =
4193                             journal_getblk(sb,
4194                                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4195                                            ((cur_write_start +
4196                                              jindex) %
4197                                             SB_ONDISK_JOURNAL_SIZE(sb)));
4198                         set_buffer_uptodate(tmp_bh);
4199                         page = cn->bh->b_page;
4200                         addr = kmap(page);
4201                         memcpy(tmp_bh->b_data,
4202                                addr + offset_in_page(cn->bh->b_data),
4203                                cn->bh->b_size);
4204                         kunmap(page);
4205                         mark_buffer_dirty(tmp_bh);
4206                         jindex++;
4207                         set_buffer_journal_dirty(cn->bh);
4208                         clear_buffer_journaled(cn->bh);
4209                 } else {
4210                         /*
4211                          * JDirty cleared sometime during transaction.
4212                          * don't log this one
4213                          */
4214                         reiserfs_warning(sb, "journal-2048",
4215                                          "BAD, buffer in journal hash, "
4216                                          "but not JDirty!");
4217                         brelse(cn->bh);
4218                 }
4219                 next = cn->next;
4220                 free_cnode(sb, cn);
4221                 cn = next;
4222                 reiserfs_cond_resched(sb);
4223         }
4224
4225         /*
4226          * we are done with both the c_bh and d_bh, but
4227          * c_bh must be written after all other commit blocks,
4228          * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4229          */
4230
4231         journal->j_current_jl = alloc_journal_list(sb);
4232
4233         /* now it is safe to insert this transaction on the main list */
4234         list_add_tail(&jl->j_list, &journal->j_journal_list);
4235         list_add_tail(&jl->j_working_list, &journal->j_working_list);
4236         journal->j_num_work_lists++;
4237
4238         /* reset journal values for the next transaction */
4239         journal->j_start =
4240             (journal->j_start + journal->j_len +
4241              2) % SB_ONDISK_JOURNAL_SIZE(sb);
4242         atomic_set(&journal->j_wcount, 0);
4243         journal->j_bcount = 0;
4244         journal->j_last = NULL;
4245         journal->j_first = NULL;
4246         journal->j_len = 0;
4247         journal->j_trans_start_time = 0;
4248         /* check for trans_id overflow */
4249         if (++journal->j_trans_id == 0)
4250                 journal->j_trans_id = 10;
4251         journal->j_current_jl->j_trans_id = journal->j_trans_id;
4252         journal->j_must_wait = 0;
4253         journal->j_len_alloc = 0;
4254         journal->j_next_full_flush = 0;
4255         journal->j_next_async_flush = 0;
4256         init_journal_hash(sb);
4257
4258         /*
4259          * make sure reiserfs_add_jh sees the new current_jl before we
4260          * write out the tails
4261          */
4262         smp_mb();
4263
4264         /*
4265          * tail conversion targets have to hit the disk before we end the
4266          * transaction.  Otherwise a later transaction might repack the tail
4267          * before this transaction commits, leaving the data block unflushed
4268          * and clean, if we crash before the later transaction commits, the
4269          * data block is lost.
4270          */
4271         if (!list_empty(&jl->j_tail_bh_list)) {
4272                 depth = reiserfs_write_unlock_nested(sb);
4273                 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4274                                       journal, jl, &jl->j_tail_bh_list);
4275                 reiserfs_write_lock_nested(sb, depth);
4276         }
4277         BUG_ON(!list_empty(&jl->j_tail_bh_list));
4278         mutex_unlock(&jl->j_commit_mutex);
4279
4280         /*
4281          * honor the flush wishes from the caller, simple commits can
4282          * be done outside the journal lock, they are done below
4283          *
4284          * if we don't flush the commit list right now, we put it into
4285          * the work queue so the people waiting on the async progress work
4286          * queue don't wait for this proc to flush journal lists and such.
4287          */
4288         if (flush) {
4289                 flush_commit_list(sb, jl, 1);
4290                 flush_journal_list(sb, jl, 1);
4291         } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4292                 /*
4293                  * Avoid queueing work when sb is being shut down. Transaction
4294                  * will be flushed on journal shutdown.
4295                  */
4296                 if (sb->s_flags & SB_ACTIVE)
4297                         queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4298                                            &journal->j_work, HZ / 10);
4299         }
4300
4301         /*
4302          * if the next transaction has any chance of wrapping, flush
4303          * transactions that might get overwritten.  If any journal lists
4304          * are very old flush them as well.
4305          */
4306 first_jl:
4307         list_for_each_safe(entry, safe, &journal->j_journal_list) {
4308                 temp_jl = JOURNAL_LIST_ENTRY(entry);
4309                 if (journal->j_start <= temp_jl->j_start) {
4310                         if ((journal->j_start + journal->j_trans_max + 1) >=
4311                             temp_jl->j_start) {
4312                                 flush_used_journal_lists(sb, temp_jl);
4313                                 goto first_jl;
4314                         } else if ((journal->j_start +
4315                                     journal->j_trans_max + 1) <
4316                                    SB_ONDISK_JOURNAL_SIZE(sb)) {
4317                                 /*
4318                                  * if we don't cross into the next
4319                                  * transaction and we don't wrap, there is
4320                                  * no way we can overlap any later transactions
4321                                  * break now
4322                                  */
4323                                 break;
4324                         }
4325                 } else if ((journal->j_start +
4326                             journal->j_trans_max + 1) >
4327                            SB_ONDISK_JOURNAL_SIZE(sb)) {
4328                         if (((journal->j_start + journal->j_trans_max + 1) %
4329                              SB_ONDISK_JOURNAL_SIZE(sb)) >=
4330                             temp_jl->j_start) {
4331                                 flush_used_journal_lists(sb, temp_jl);
4332                                 goto first_jl;
4333                         } else {
4334                                 /*
4335                                 * we don't overlap anything from out start
4336                                 * to the end of the log, and our wrapped
4337                                 * portion doesn't overlap anything at
4338                                 * the start of the log.  We can break
4339                                 */
4340                                 break;
4341                         }
4342                 }
4343         }
4344
4345         journal->j_current_jl->j_list_bitmap =
4346             get_list_bitmap(sb, journal->j_current_jl);
4347
4348         if (!(journal->j_current_jl->j_list_bitmap)) {
4349                 reiserfs_panic(sb, "journal-1996",
4350                                "could not get a list bitmap");
4351         }
4352
4353         atomic_set(&journal->j_jlock, 0);
4354         unlock_journal(sb);
4355         /* wake up any body waiting to join. */
4356         clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4357         wake_up(&journal->j_join_wait);
4358
4359         if (!flush && wait_on_commit &&
4360             journal_list_still_alive(sb, commit_trans_id)) {
4361                 flush_commit_list(sb, jl, 1);
4362         }
4363 out:
4364         reiserfs_check_lock_depth(sb, "journal end2");
4365
4366         memset(th, 0, sizeof(*th));
4367         /*
4368          * Re-set th->t_super, so we can properly keep track of how many
4369          * persistent transactions there are. We need to do this so if this
4370          * call is part of a failed restart_transaction, we can free it later
4371          */
4372         th->t_super = sb;
4373
4374         return journal->j_errno;
4375 }
4376
4377 /* Send the file system read only and refuse new transactions */
4378 void reiserfs_abort_journal(struct super_block *sb, int errno)
4379 {
4380         struct reiserfs_journal *journal = SB_JOURNAL(sb);
4381         if (test_bit(J_ABORTED, &journal->j_state))
4382                 return;
4383
4384         if (!journal->j_errno)
4385                 journal->j_errno = errno;
4386
4387         sb->s_flags |= SB_RDONLY;
4388         set_bit(J_ABORTED, &journal->j_state);
4389
4390 #ifdef CONFIG_REISERFS_CHECK
4391         dump_stack();
4392 #endif
4393 }