fs/gfs2/log.c

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This source file includes following definitions.
gfs2_struct2blk
gfs2_remove_from_ail
gfs2_ail1_start_one
gfs2_ail1_flush
gfs2_ail1_start
gfs2_ail1_empty_one
gfs2_ail1_empty
gfs2_ail1_wait
gfs2_ail2_empty_one
ail2_empty
gfs2_log_release
gfs2_log_reserve
log_distance
calc_reserved
current_tail
log_pull_tail
log_flush_wait
ip_cmp
gfs2_ordered_write
gfs2_ordered_wait
gfs2_ordered_del_inode
gfs2_add_revoke
gfs2_glock_remove_revoke
gfs2_write_revokes
gfs2_write_log_header
log_write_header
gfs2_log_flush
gfs2_merge_trans
log_refund
gfs2_log_commit
gfs2_log_shutdown
gfs2_jrnl_flush_reqd
gfs2_ail_flush_reqd
gfs2_logd
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   5  */
   6 
   7 #include <linux/sched.h>
   8 #include <linux/slab.h>
   9 #include <linux/spinlock.h>
  10 #include <linux/completion.h>
  11 #include <linux/buffer_head.h>
  12 #include <linux/gfs2_ondisk.h>
  13 #include <linux/crc32.h>
  14 #include <linux/crc32c.h>
  15 #include <linux/delay.h>
  16 #include <linux/kthread.h>
  17 #include <linux/freezer.h>
  18 #include <linux/bio.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/writeback.h>
  21 #include <linux/list_sort.h>
  22 
  23 #include "gfs2.h"
  24 #include "incore.h"
  25 #include "bmap.h"
  26 #include "glock.h"
  27 #include "log.h"
  28 #include "lops.h"
  29 #include "meta_io.h"
  30 #include "util.h"
  31 #include "dir.h"
  32 #include "trace_gfs2.h"
  33 
  34 /**
  35  * gfs2_struct2blk - compute stuff
  36  * @sdp: the filesystem
  37  * @nstruct: the number of structures
  38  * @ssize: the size of the structures
  39  *
  40  * Compute the number of log descriptor blocks needed to hold a certain number
  41  * of structures of a certain size.
  42  *
  43  * Returns: the number of blocks needed (minimum is always 1)
  44  */
  45 
  46 unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
  47                              unsigned int ssize)
  48 {
  49         unsigned int blks;
  50         unsigned int first, second;
  51 
  52         blks = 1;
  53         first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
  54 
  55         if (nstruct > first) {
  56                 second = (sdp->sd_sb.sb_bsize -
  57                           sizeof(struct gfs2_meta_header)) / ssize;
  58                 blks += DIV_ROUND_UP(nstruct - first, second);
  59         }
  60 
  61         return blks;
  62 }
  63 
  64 /**
  65  * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
  66  * @mapping: The associated mapping (maybe NULL)
  67  * @bd: The gfs2_bufdata to remove
  68  *
  69  * The ail lock _must_ be held when calling this function
  70  *
  71  */
  72 
  73 static void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
  74 {
  75         bd->bd_tr = NULL;
  76         list_del_init(&bd->bd_ail_st_list);
  77         list_del_init(&bd->bd_ail_gl_list);
  78         atomic_dec(&bd->bd_gl->gl_ail_count);
  79         brelse(bd->bd_bh);
  80 }
  81 
  82 /**
  83  * gfs2_ail1_start_one - Start I/O on a part of the AIL
  84  * @sdp: the filesystem
  85  * @wbc: The writeback control structure
  86  * @ai: The ail structure
  87  *
  88  */
  89 
  90 static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
  91                                struct writeback_control *wbc,
  92                                struct gfs2_trans *tr,
  93                                bool *withdraw)
  94 __releases(&sdp->sd_ail_lock)
  95 __acquires(&sdp->sd_ail_lock)
  96 {
  97         struct gfs2_glock *gl = NULL;
  98         struct address_space *mapping;
  99         struct gfs2_bufdata *bd, *s;
 100         struct buffer_head *bh;
 101 
 102         list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list, bd_ail_st_list) {
 103                 bh = bd->bd_bh;
 104 
 105                 gfs2_assert(sdp, bd->bd_tr == tr);
 106 
 107                 if (!buffer_busy(bh)) {
 108                         if (!buffer_uptodate(bh) &&
 109                             !test_and_set_bit(SDF_AIL1_IO_ERROR,
 110                                               &sdp->sd_flags)) {
 111                                 gfs2_io_error_bh(sdp, bh);
 112                                 *withdraw = true;
 113                         }
 114                         list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list);
 115                         continue;
 116                 }
 117 
 118                 if (!buffer_dirty(bh))
 119                         continue;
 120                 if (gl == bd->bd_gl)
 121                         continue;
 122                 gl = bd->bd_gl;
 123                 list_move(&bd->bd_ail_st_list, &tr->tr_ail1_list);
 124                 mapping = bh->b_page->mapping;
 125                 if (!mapping)
 126                         continue;
 127                 spin_unlock(&sdp->sd_ail_lock);
 128                 generic_writepages(mapping, wbc);
 129                 spin_lock(&sdp->sd_ail_lock);
 130                 if (wbc->nr_to_write <= 0)
 131                         break;
 132                 return 1;
 133         }
 134 
 135         return 0;
 136 }
 137 
 138 
 139 /**
 140  * gfs2_ail1_flush - start writeback of some ail1 entries 
 141  * @sdp: The super block
 142  * @wbc: The writeback control structure
 143  *
 144  * Writes back some ail1 entries, according to the limits in the
 145  * writeback control structure
 146  */
 147 
 148 void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc)
 149 {
 150         struct list_head *head = &sdp->sd_ail1_list;
 151         struct gfs2_trans *tr;
 152         struct blk_plug plug;
 153         bool withdraw = false;
 154 
 155         trace_gfs2_ail_flush(sdp, wbc, 1);
 156         blk_start_plug(&plug);
 157         spin_lock(&sdp->sd_ail_lock);
 158 restart:
 159         list_for_each_entry_reverse(tr, head, tr_list) {
 160                 if (wbc->nr_to_write <= 0)
 161                         break;
 162                 if (gfs2_ail1_start_one(sdp, wbc, tr, &withdraw))
 163                         goto restart;
 164         }
 165         spin_unlock(&sdp->sd_ail_lock);
 166         blk_finish_plug(&plug);
 167         if (withdraw)
 168                 gfs2_lm_withdraw(sdp, NULL);
 169         trace_gfs2_ail_flush(sdp, wbc, 0);
 170 }
 171 
 172 /**
 173  * gfs2_ail1_start - start writeback of all ail1 entries
 174  * @sdp: The superblock
 175  */
 176 
 177 static void gfs2_ail1_start(struct gfs2_sbd *sdp)
 178 {
 179         struct writeback_control wbc = {
 180                 .sync_mode = WB_SYNC_NONE,
 181                 .nr_to_write = LONG_MAX,
 182                 .range_start = 0,
 183                 .range_end = LLONG_MAX,
 184         };
 185 
 186         return gfs2_ail1_flush(sdp, &wbc);
 187 }
 188 
 189 /**
 190  * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
 191  * @sdp: the filesystem
 192  * @ai: the AIL entry
 193  *
 194  */
 195 
 196 static void gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
 197                                 bool *withdraw)
 198 {
 199         struct gfs2_bufdata *bd, *s;
 200         struct buffer_head *bh;
 201 
 202         list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list,
 203                                          bd_ail_st_list) {
 204                 bh = bd->bd_bh;
 205                 gfs2_assert(sdp, bd->bd_tr == tr);
 206                 if (buffer_busy(bh))
 207                         continue;
 208                 if (!buffer_uptodate(bh) &&
 209                     !test_and_set_bit(SDF_AIL1_IO_ERROR, &sdp->sd_flags)) {
 210                         gfs2_io_error_bh(sdp, bh);
 211                         *withdraw = true;
 212                 }
 213                 list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list);
 214         }
 215 }
 216 
 217 /**
 218  * gfs2_ail1_empty - Try to empty the ail1 lists
 219  * @sdp: The superblock
 220  *
 221  * Tries to empty the ail1 lists, starting with the oldest first
 222  */
 223 
 224 static int gfs2_ail1_empty(struct gfs2_sbd *sdp)
 225 {
 226         struct gfs2_trans *tr, *s;
 227         int oldest_tr = 1;
 228         int ret;
 229         bool withdraw = false;
 230 
 231         spin_lock(&sdp->sd_ail_lock);
 232         list_for_each_entry_safe_reverse(tr, s, &sdp->sd_ail1_list, tr_list) {
 233                 gfs2_ail1_empty_one(sdp, tr, &withdraw);
 234                 if (list_empty(&tr->tr_ail1_list) && oldest_tr)
 235                         list_move(&tr->tr_list, &sdp->sd_ail2_list);
 236                 else
 237                         oldest_tr = 0;
 238         }
 239         ret = list_empty(&sdp->sd_ail1_list);
 240         spin_unlock(&sdp->sd_ail_lock);
 241 
 242         if (withdraw)
 243                 gfs2_lm_withdraw(sdp, "fatal: I/O error(s)\n");
 244 
 245         return ret;
 246 }
 247 
 248 static void gfs2_ail1_wait(struct gfs2_sbd *sdp)
 249 {
 250         struct gfs2_trans *tr;
 251         struct gfs2_bufdata *bd;
 252         struct buffer_head *bh;
 253 
 254         spin_lock(&sdp->sd_ail_lock);
 255         list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
 256                 list_for_each_entry(bd, &tr->tr_ail1_list, bd_ail_st_list) {
 257                         bh = bd->bd_bh;
 258                         if (!buffer_locked(bh))
 259                                 continue;
 260                         get_bh(bh);
 261                         spin_unlock(&sdp->sd_ail_lock);
 262                         wait_on_buffer(bh);
 263                         brelse(bh);
 264                         return;
 265                 }
 266         }
 267         spin_unlock(&sdp->sd_ail_lock);
 268 }
 269 
 270 /**
 271  * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
 272  * @sdp: the filesystem
 273  * @ai: the AIL entry
 274  *
 275  */
 276 
 277 static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 278 {
 279         struct list_head *head = &tr->tr_ail2_list;
 280         struct gfs2_bufdata *bd;
 281 
 282         while (!list_empty(head)) {
 283                 bd = list_entry(head->prev, struct gfs2_bufdata,
 284                                 bd_ail_st_list);
 285                 gfs2_assert(sdp, bd->bd_tr == tr);
 286                 gfs2_remove_from_ail(bd);
 287         }
 288 }
 289 
 290 static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
 291 {
 292         struct gfs2_trans *tr, *safe;
 293         unsigned int old_tail = sdp->sd_log_tail;
 294         int wrap = (new_tail < old_tail);
 295         int a, b, rm;
 296 
 297         spin_lock(&sdp->sd_ail_lock);
 298 
 299         list_for_each_entry_safe(tr, safe, &sdp->sd_ail2_list, tr_list) {
 300                 a = (old_tail <= tr->tr_first);
 301                 b = (tr->tr_first < new_tail);
 302                 rm = (wrap) ? (a || b) : (a && b);
 303                 if (!rm)
 304                         continue;
 305 
 306                 gfs2_ail2_empty_one(sdp, tr);
 307                 list_del(&tr->tr_list);
 308                 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
 309                 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list));
 310                 kfree(tr);
 311         }
 312 
 313         spin_unlock(&sdp->sd_ail_lock);
 314 }
 315 
 316 /**
 317  * gfs2_log_release - Release a given number of log blocks
 318  * @sdp: The GFS2 superblock
 319  * @blks: The number of blocks
 320  *
 321  */
 322 
 323 void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
 324 {
 325 
 326         atomic_add(blks, &sdp->sd_log_blks_free);
 327         trace_gfs2_log_blocks(sdp, blks);
 328         gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
 329                                   sdp->sd_jdesc->jd_blocks);
 330         up_read(&sdp->sd_log_flush_lock);
 331 }
 332 
 333 /**
 334  * gfs2_log_reserve - Make a log reservation
 335  * @sdp: The GFS2 superblock
 336  * @blks: The number of blocks to reserve
 337  *
 338  * Note that we never give out the last few blocks of the journal. Thats
 339  * due to the fact that there is a small number of header blocks
 340  * associated with each log flush. The exact number can't be known until
 341  * flush time, so we ensure that we have just enough free blocks at all
 342  * times to avoid running out during a log flush.
 343  *
 344  * We no longer flush the log here, instead we wake up logd to do that
 345  * for us. To avoid the thundering herd and to ensure that we deal fairly
 346  * with queued waiters, we use an exclusive wait. This means that when we
 347  * get woken with enough journal space to get our reservation, we need to
 348  * wake the next waiter on the list.
 349  *
 350  * Returns: errno
 351  */
 352 
 353 int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
 354 {
 355         int ret = 0;
 356         unsigned reserved_blks = 7 * (4096 / sdp->sd_vfs->s_blocksize);
 357         unsigned wanted = blks + reserved_blks;
 358         DEFINE_WAIT(wait);
 359         int did_wait = 0;
 360         unsigned int free_blocks;
 361 
 362         if (gfs2_assert_warn(sdp, blks) ||
 363             gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
 364                 return -EINVAL;
 365         atomic_add(blks, &sdp->sd_log_blks_needed);
 366 retry:
 367         free_blocks = atomic_read(&sdp->sd_log_blks_free);
 368         if (unlikely(free_blocks <= wanted)) {
 369                 do {
 370                         prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
 371                                         TASK_UNINTERRUPTIBLE);
 372                         wake_up(&sdp->sd_logd_waitq);
 373                         did_wait = 1;
 374                         if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
 375                                 io_schedule();
 376                         free_blocks = atomic_read(&sdp->sd_log_blks_free);
 377                 } while(free_blocks <= wanted);
 378                 finish_wait(&sdp->sd_log_waitq, &wait);
 379         }
 380         atomic_inc(&sdp->sd_reserving_log);
 381         if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
 382                                 free_blocks - blks) != free_blocks) {
 383                 if (atomic_dec_and_test(&sdp->sd_reserving_log))
 384                         wake_up(&sdp->sd_reserving_log_wait);
 385                 goto retry;
 386         }
 387         atomic_sub(blks, &sdp->sd_log_blks_needed);
 388         trace_gfs2_log_blocks(sdp, -blks);
 389 
 390         /*
 391          * If we waited, then so might others, wake them up _after_ we get
 392          * our share of the log.
 393          */
 394         if (unlikely(did_wait))
 395                 wake_up(&sdp->sd_log_waitq);
 396 
 397         down_read(&sdp->sd_log_flush_lock);
 398         if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
 399                 gfs2_log_release(sdp, blks);
 400                 ret = -EROFS;
 401         }
 402         if (atomic_dec_and_test(&sdp->sd_reserving_log))
 403                 wake_up(&sdp->sd_reserving_log_wait);
 404         return ret;
 405 }
 406 
 407 /**
 408  * log_distance - Compute distance between two journal blocks
 409  * @sdp: The GFS2 superblock
 410  * @newer: The most recent journal block of the pair
 411  * @older: The older journal block of the pair
 412  *
 413  *   Compute the distance (in the journal direction) between two
 414  *   blocks in the journal
 415  *
 416  * Returns: the distance in blocks
 417  */
 418 
 419 static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
 420                                         unsigned int older)
 421 {
 422         int dist;
 423 
 424         dist = newer - older;
 425         if (dist < 0)
 426                 dist += sdp->sd_jdesc->jd_blocks;
 427 
 428         return dist;
 429 }
 430 
 431 /**
 432  * calc_reserved - Calculate the number of blocks to reserve when
 433  *                 refunding a transaction's unused buffers.
 434  * @sdp: The GFS2 superblock
 435  *
 436  * This is complex.  We need to reserve room for all our currently used
 437  * metadata buffers (e.g. normal file I/O rewriting file time stamps) and 
 438  * all our journaled data buffers for journaled files (e.g. files in the 
 439  * meta_fs like rindex, or files for which chattr +j was done.)
 440  * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
 441  * will count it as free space (sd_log_blks_free) and corruption will follow.
 442  *
 443  * We can have metadata bufs and jdata bufs in the same journal.  So each
 444  * type gets its own log header, for which we need to reserve a block.
 445  * In fact, each type has the potential for needing more than one header 
 446  * in cases where we have more buffers than will fit on a journal page.
 447  * Metadata journal entries take up half the space of journaled buffer entries.
 448  * Thus, metadata entries have buf_limit (502) and journaled buffers have
 449  * databuf_limit (251) before they cause a wrap around.
 450  *
 451  * Also, we need to reserve blocks for revoke journal entries and one for an
 452  * overall header for the lot.
 453  *
 454  * Returns: the number of blocks reserved
 455  */
 456 static unsigned int calc_reserved(struct gfs2_sbd *sdp)
 457 {
 458         unsigned int reserved = 0;
 459         unsigned int mbuf;
 460         unsigned int dbuf;
 461         struct gfs2_trans *tr = sdp->sd_log_tr;
 462 
 463         if (tr) {
 464                 mbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
 465                 dbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
 466                 reserved = mbuf + dbuf;
 467                 /* Account for header blocks */
 468                 reserved += DIV_ROUND_UP(mbuf, buf_limit(sdp));
 469                 reserved += DIV_ROUND_UP(dbuf, databuf_limit(sdp));
 470         }
 471 
 472         if (sdp->sd_log_commited_revoke > 0)
 473                 reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
 474                                           sizeof(u64));
 475         /* One for the overall header */
 476         if (reserved)
 477                 reserved++;
 478         return reserved;
 479 }
 480 
 481 static unsigned int current_tail(struct gfs2_sbd *sdp)
 482 {
 483         struct gfs2_trans *tr;
 484         unsigned int tail;
 485 
 486         spin_lock(&sdp->sd_ail_lock);
 487 
 488         if (list_empty(&sdp->sd_ail1_list)) {
 489                 tail = sdp->sd_log_head;
 490         } else {
 491                 tr = list_entry(sdp->sd_ail1_list.prev, struct gfs2_trans,
 492                                 tr_list);
 493                 tail = tr->tr_first;
 494         }
 495 
 496         spin_unlock(&sdp->sd_ail_lock);
 497 
 498         return tail;
 499 }
 500 
 501 static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
 502 {
 503         unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
 504 
 505         ail2_empty(sdp, new_tail);
 506 
 507         atomic_add(dist, &sdp->sd_log_blks_free);
 508         trace_gfs2_log_blocks(sdp, dist);
 509         gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
 510                              sdp->sd_jdesc->jd_blocks);
 511 
 512         sdp->sd_log_tail = new_tail;
 513 }
 514 
 515 
 516 void log_flush_wait(struct gfs2_sbd *sdp)
 517 {
 518         DEFINE_WAIT(wait);
 519 
 520         if (atomic_read(&sdp->sd_log_in_flight)) {
 521                 do {
 522                         prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
 523                                         TASK_UNINTERRUPTIBLE);
 524                         if (atomic_read(&sdp->sd_log_in_flight))
 525                                 io_schedule();
 526                 } while(atomic_read(&sdp->sd_log_in_flight));
 527                 finish_wait(&sdp->sd_log_flush_wait, &wait);
 528         }
 529 }
 530 
 531 static int ip_cmp(void *priv, struct list_head *a, struct list_head *b)
 532 {
 533         struct gfs2_inode *ipa, *ipb;
 534 
 535         ipa = list_entry(a, struct gfs2_inode, i_ordered);
 536         ipb = list_entry(b, struct gfs2_inode, i_ordered);
 537 
 538         if (ipa->i_no_addr < ipb->i_no_addr)
 539                 return -1;
 540         if (ipa->i_no_addr > ipb->i_no_addr)
 541                 return 1;
 542         return 0;
 543 }
 544 
 545 static void gfs2_ordered_write(struct gfs2_sbd *sdp)
 546 {
 547         struct gfs2_inode *ip;
 548         LIST_HEAD(written);
 549 
 550         spin_lock(&sdp->sd_ordered_lock);
 551         list_sort(NULL, &sdp->sd_log_ordered, &ip_cmp);
 552         while (!list_empty(&sdp->sd_log_ordered)) {
 553                 ip = list_entry(sdp->sd_log_ordered.next, struct gfs2_inode, i_ordered);
 554                 if (ip->i_inode.i_mapping->nrpages == 0) {
 555                         test_and_clear_bit(GIF_ORDERED, &ip->i_flags);
 556                         list_del(&ip->i_ordered);
 557                         continue;
 558                 }
 559                 list_move(&ip->i_ordered, &written);
 560                 spin_unlock(&sdp->sd_ordered_lock);
 561                 filemap_fdatawrite(ip->i_inode.i_mapping);
 562                 spin_lock(&sdp->sd_ordered_lock);
 563         }
 564         list_splice(&written, &sdp->sd_log_ordered);
 565         spin_unlock(&sdp->sd_ordered_lock);
 566 }
 567 
 568 static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
 569 {
 570         struct gfs2_inode *ip;
 571 
 572         spin_lock(&sdp->sd_ordered_lock);
 573         while (!list_empty(&sdp->sd_log_ordered)) {
 574                 ip = list_entry(sdp->sd_log_ordered.next, struct gfs2_inode, i_ordered);
 575                 list_del(&ip->i_ordered);
 576                 WARN_ON(!test_and_clear_bit(GIF_ORDERED, &ip->i_flags));
 577                 if (ip->i_inode.i_mapping->nrpages == 0)
 578                         continue;
 579                 spin_unlock(&sdp->sd_ordered_lock);
 580                 filemap_fdatawait(ip->i_inode.i_mapping);
 581                 spin_lock(&sdp->sd_ordered_lock);
 582         }
 583         spin_unlock(&sdp->sd_ordered_lock);
 584 }
 585 
 586 void gfs2_ordered_del_inode(struct gfs2_inode *ip)
 587 {
 588         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 589 
 590         spin_lock(&sdp->sd_ordered_lock);
 591         if (test_and_clear_bit(GIF_ORDERED, &ip->i_flags))
 592                 list_del(&ip->i_ordered);
 593         spin_unlock(&sdp->sd_ordered_lock);
 594 }
 595 
 596 void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 597 {
 598         struct buffer_head *bh = bd->bd_bh;
 599         struct gfs2_glock *gl = bd->bd_gl;
 600 
 601         sdp->sd_log_num_revoke++;
 602         if (atomic_inc_return(&gl->gl_revokes) == 1)
 603                 gfs2_glock_hold(gl);
 604         bh->b_private = NULL;
 605         bd->bd_blkno = bh->b_blocknr;
 606         gfs2_remove_from_ail(bd); /* drops ref on bh */
 607         bd->bd_bh = NULL;
 608         set_bit(GLF_LFLUSH, &gl->gl_flags);
 609         list_add(&bd->bd_list, &sdp->sd_log_revokes);
 610 }
 611 
 612 void gfs2_glock_remove_revoke(struct gfs2_glock *gl)
 613 {
 614         if (atomic_dec_return(&gl->gl_revokes) == 0) {
 615                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
 616                 gfs2_glock_queue_put(gl);
 617         }
 618 }
 619 
 620 void gfs2_write_revokes(struct gfs2_sbd *sdp)
 621 {
 622         struct gfs2_trans *tr;
 623         struct gfs2_bufdata *bd, *tmp;
 624         int have_revokes = 0;
 625         int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
 626 
 627         gfs2_ail1_empty(sdp);
 628         spin_lock(&sdp->sd_ail_lock);
 629         list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
 630                 list_for_each_entry(bd, &tr->tr_ail2_list, bd_ail_st_list) {
 631                         if (list_empty(&bd->bd_list)) {
 632                                 have_revokes = 1;
 633                                 goto done;
 634                         }
 635                 }
 636         }
 637 done:
 638         spin_unlock(&sdp->sd_ail_lock);
 639         if (have_revokes == 0)
 640                 return;
 641         while (sdp->sd_log_num_revoke > max_revokes)
 642                 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
 643         max_revokes -= sdp->sd_log_num_revoke;
 644         if (!sdp->sd_log_num_revoke) {
 645                 atomic_dec(&sdp->sd_log_blks_free);
 646                 /* If no blocks have been reserved, we need to also
 647                  * reserve a block for the header */
 648                 if (!sdp->sd_log_blks_reserved)
 649                         atomic_dec(&sdp->sd_log_blks_free);
 650         }
 651         gfs2_log_lock(sdp);
 652         spin_lock(&sdp->sd_ail_lock);
 653         list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
 654                 list_for_each_entry_safe(bd, tmp, &tr->tr_ail2_list, bd_ail_st_list) {
 655                         if (max_revokes == 0)
 656                                 goto out_of_blocks;
 657                         if (!list_empty(&bd->bd_list))
 658                                 continue;
 659                         gfs2_add_revoke(sdp, bd);
 660                         max_revokes--;
 661                 }
 662         }
 663 out_of_blocks:
 664         spin_unlock(&sdp->sd_ail_lock);
 665         gfs2_log_unlock(sdp);
 666 
 667         if (!sdp->sd_log_num_revoke) {
 668                 atomic_inc(&sdp->sd_log_blks_free);
 669                 if (!sdp->sd_log_blks_reserved)
 670                         atomic_inc(&sdp->sd_log_blks_free);
 671         }
 672 }
 673 
 674 /**
 675  * gfs2_write_log_header - Write a journal log header buffer at lblock
 676  * @sdp: The GFS2 superblock
 677  * @jd: journal descriptor of the journal to which we are writing
 678  * @seq: sequence number
 679  * @tail: tail of the log
 680  * @lblock: value for lh_blkno (block number relative to start of journal)
 681  * @flags: log header flags GFS2_LOG_HEAD_*
 682  * @op_flags: flags to pass to the bio
 683  *
 684  * Returns: the initialized log buffer descriptor
 685  */
 686 
 687 void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
 688                            u64 seq, u32 tail, u32 lblock, u32 flags,
 689                            int op_flags)
 690 {
 691         struct gfs2_log_header *lh;
 692         u32 hash, crc;
 693         struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
 694         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 695         struct timespec64 tv;
 696         struct super_block *sb = sdp->sd_vfs;
 697         u64 dblock;
 698 
 699         lh = page_address(page);
 700         clear_page(lh);
 701 
 702         lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 703         lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
 704         lh->lh_header.__pad0 = cpu_to_be64(0);
 705         lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
 706         lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 707         lh->lh_sequence = cpu_to_be64(seq);
 708         lh->lh_flags = cpu_to_be32(flags);
 709         lh->lh_tail = cpu_to_be32(tail);
 710         lh->lh_blkno = cpu_to_be32(lblock);
 711         hash = ~crc32(~0, lh, LH_V1_SIZE);
 712         lh->lh_hash = cpu_to_be32(hash);
 713 
 714         ktime_get_coarse_real_ts64(&tv);
 715         lh->lh_nsec = cpu_to_be32(tv.tv_nsec);
 716         lh->lh_sec = cpu_to_be64(tv.tv_sec);
 717         if (!list_empty(&jd->extent_list))
 718                 dblock = gfs2_log_bmap(sdp);
 719         else {
 720                 int ret = gfs2_lblk_to_dblk(jd->jd_inode, lblock, &dblock);
 721                 if (gfs2_assert_withdraw(sdp, ret == 0))
 722                         return;
 723         }
 724         lh->lh_addr = cpu_to_be64(dblock);
 725         lh->lh_jinode = cpu_to_be64(GFS2_I(jd->jd_inode)->i_no_addr);
 726 
 727         /* We may only write local statfs, quota, etc., when writing to our
 728            own journal. The values are left 0 when recovering a journal
 729            different from our own. */
 730         if (!(flags & GFS2_LOG_HEAD_RECOVERY)) {
 731                 lh->lh_statfs_addr =
 732                         cpu_to_be64(GFS2_I(sdp->sd_sc_inode)->i_no_addr);
 733                 lh->lh_quota_addr =
 734                         cpu_to_be64(GFS2_I(sdp->sd_qc_inode)->i_no_addr);
 735 
 736                 spin_lock(&sdp->sd_statfs_spin);
 737                 lh->lh_local_total = cpu_to_be64(l_sc->sc_total);
 738                 lh->lh_local_free = cpu_to_be64(l_sc->sc_free);
 739                 lh->lh_local_dinodes = cpu_to_be64(l_sc->sc_dinodes);
 740                 spin_unlock(&sdp->sd_statfs_spin);
 741         }
 742 
 743         BUILD_BUG_ON(offsetof(struct gfs2_log_header, lh_crc) != LH_V1_SIZE);
 744 
 745         crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
 746                      sb->s_blocksize - LH_V1_SIZE - 4);
 747         lh->lh_crc = cpu_to_be32(crc);
 748 
 749         gfs2_log_write(sdp, page, sb->s_blocksize, 0, dblock);
 750         gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE | op_flags);
 751         log_flush_wait(sdp);
 752 }
 753 
 754 /**
 755  * log_write_header - Get and initialize a journal header buffer
 756  * @sdp: The GFS2 superblock
 757  * @flags: The log header flags, including log header origin
 758  *
 759  * Returns: the initialized log buffer descriptor
 760  */
 761 
 762 static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
 763 {
 764         unsigned int tail;
 765         int op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC;
 766         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 767 
 768         gfs2_assert_withdraw(sdp, (state != SFS_FROZEN));
 769         tail = current_tail(sdp);
 770 
 771         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
 772                 gfs2_ordered_wait(sdp);
 773                 log_flush_wait(sdp);
 774                 op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
 775         }
 776         sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
 777         gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, tail,
 778                               sdp->sd_log_flush_head, flags, op_flags);
 779 
 780         if (sdp->sd_log_tail != tail)
 781                 log_pull_tail(sdp, tail);
 782 }
 783 
 784 /**
 785  * gfs2_log_flush - flush incore transaction(s)
 786  * @sdp: the filesystem
 787  * @gl: The glock structure to flush.  If NULL, flush the whole incore log
 788  * @flags: The log header flags: GFS2_LOG_HEAD_FLUSH_* and debug flags
 789  *
 790  */
 791 
 792 void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
 793 {
 794         struct gfs2_trans *tr;
 795         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 796 
 797         down_write(&sdp->sd_log_flush_lock);
 798 
 799         /* Log might have been flushed while we waited for the flush lock */
 800         if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
 801                 up_write(&sdp->sd_log_flush_lock);
 802                 return;
 803         }
 804         trace_gfs2_log_flush(sdp, 1, flags);
 805 
 806         if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN)
 807                 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 808 
 809         sdp->sd_log_flush_head = sdp->sd_log_head;
 810         tr = sdp->sd_log_tr;
 811         if (tr) {
 812                 sdp->sd_log_tr = NULL;
 813                 INIT_LIST_HEAD(&tr->tr_ail1_list);
 814                 INIT_LIST_HEAD(&tr->tr_ail2_list);
 815                 tr->tr_first = sdp->sd_log_flush_head;
 816                 if (unlikely (state == SFS_FROZEN))
 817                         gfs2_assert_withdraw(sdp, !tr->tr_num_buf_new && !tr->tr_num_databuf_new);
 818         }
 819 
 820         if (unlikely(state == SFS_FROZEN))
 821                 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 822         gfs2_assert_withdraw(sdp,
 823                         sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
 824 
 825         gfs2_ordered_write(sdp);
 826         lops_before_commit(sdp, tr);
 827         gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE);
 828 
 829         if (sdp->sd_log_head != sdp->sd_log_flush_head) {
 830                 log_flush_wait(sdp);
 831                 log_write_header(sdp, flags);
 832         } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
 833                 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
 834                 trace_gfs2_log_blocks(sdp, -1);
 835                 log_write_header(sdp, flags);
 836         }
 837         lops_after_commit(sdp, tr);
 838 
 839         gfs2_log_lock(sdp);
 840         sdp->sd_log_head = sdp->sd_log_flush_head;
 841         sdp->sd_log_blks_reserved = 0;
 842         sdp->sd_log_commited_revoke = 0;
 843 
 844         spin_lock(&sdp->sd_ail_lock);
 845         if (tr && !list_empty(&tr->tr_ail1_list)) {
 846                 list_add(&tr->tr_list, &sdp->sd_ail1_list);
 847                 tr = NULL;
 848         }
 849         spin_unlock(&sdp->sd_ail_lock);
 850         gfs2_log_unlock(sdp);
 851 
 852         if (!(flags & GFS2_LOG_HEAD_FLUSH_NORMAL)) {
 853                 if (!sdp->sd_log_idle) {
 854                         for (;;) {
 855                                 gfs2_ail1_start(sdp);
 856                                 gfs2_ail1_wait(sdp);
 857                                 if (gfs2_ail1_empty(sdp))
 858                                         break;
 859                         }
 860                         atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
 861                         trace_gfs2_log_blocks(sdp, -1);
 862                         log_write_header(sdp, flags);
 863                         sdp->sd_log_head = sdp->sd_log_flush_head;
 864                 }
 865                 if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
 866                              GFS2_LOG_HEAD_FLUSH_FREEZE))
 867                         gfs2_log_shutdown(sdp);
 868                 if (flags & GFS2_LOG_HEAD_FLUSH_FREEZE)
 869                         atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
 870         }
 871 
 872         trace_gfs2_log_flush(sdp, 0, flags);
 873         up_write(&sdp->sd_log_flush_lock);
 874 
 875         kfree(tr);
 876 }
 877 
 878 /**
 879  * gfs2_merge_trans - Merge a new transaction into a cached transaction
 880  * @old: Original transaction to be expanded
 881  * @new: New transaction to be merged
 882  */
 883 
 884 static void gfs2_merge_trans(struct gfs2_trans *old, struct gfs2_trans *new)
 885 {
 886         WARN_ON_ONCE(!test_bit(TR_ATTACHED, &old->tr_flags));
 887 
 888         old->tr_num_buf_new     += new->tr_num_buf_new;
 889         old->tr_num_databuf_new += new->tr_num_databuf_new;
 890         old->tr_num_buf_rm      += new->tr_num_buf_rm;
 891         old->tr_num_databuf_rm  += new->tr_num_databuf_rm;
 892         old->tr_num_revoke      += new->tr_num_revoke;
 893 
 894         list_splice_tail_init(&new->tr_databuf, &old->tr_databuf);
 895         list_splice_tail_init(&new->tr_buf, &old->tr_buf);
 896 }
 897 
 898 static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 899 {
 900         unsigned int reserved;
 901         unsigned int unused;
 902         unsigned int maxres;
 903 
 904         gfs2_log_lock(sdp);
 905 
 906         if (sdp->sd_log_tr) {
 907                 gfs2_merge_trans(sdp->sd_log_tr, tr);
 908         } else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) {
 909                 gfs2_assert_withdraw(sdp, test_bit(TR_ALLOCED, &tr->tr_flags));
 910                 sdp->sd_log_tr = tr;
 911                 set_bit(TR_ATTACHED, &tr->tr_flags);
 912         }
 913 
 914         sdp->sd_log_commited_revoke += tr->tr_num_revoke;
 915         reserved = calc_reserved(sdp);
 916         maxres = sdp->sd_log_blks_reserved + tr->tr_reserved;
 917         gfs2_assert_withdraw(sdp, maxres >= reserved);
 918         unused = maxres - reserved;
 919         atomic_add(unused, &sdp->sd_log_blks_free);
 920         trace_gfs2_log_blocks(sdp, unused);
 921         gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
 922                              sdp->sd_jdesc->jd_blocks);
 923         sdp->sd_log_blks_reserved = reserved;
 924 
 925         gfs2_log_unlock(sdp);
 926 }
 927 
 928 /**
 929  * gfs2_log_commit - Commit a transaction to the log
 930  * @sdp: the filesystem
 931  * @tr: the transaction
 932  *
 933  * We wake up gfs2_logd if the number of pinned blocks exceed thresh1
 934  * or the total number of used blocks (pinned blocks plus AIL blocks)
 935  * is greater than thresh2.
 936  *
 937  * At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of
 938  * journal size.
 939  *
 940  * Returns: errno
 941  */
 942 
 943 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 944 {
 945         log_refund(sdp, tr);
 946 
 947         if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
 948             ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
 949             atomic_read(&sdp->sd_log_thresh2)))
 950                 wake_up(&sdp->sd_logd_waitq);
 951 }
 952 
 953 /**
 954  * gfs2_log_shutdown - write a shutdown header into a journal
 955  * @sdp: the filesystem
 956  *
 957  */
 958 
 959 void gfs2_log_shutdown(struct gfs2_sbd *sdp)
 960 {
 961         gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
 962         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 963         gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
 964 
 965         sdp->sd_log_flush_head = sdp->sd_log_head;
 966 
 967         log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT | GFS2_LFC_SHUTDOWN);
 968 
 969         gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
 970         gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
 971 
 972         sdp->sd_log_head = sdp->sd_log_flush_head;
 973         sdp->sd_log_tail = sdp->sd_log_head;
 974 }
 975 
 976 static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
 977 {
 978         return (atomic_read(&sdp->sd_log_pinned) +
 979                 atomic_read(&sdp->sd_log_blks_needed) >=
 980                 atomic_read(&sdp->sd_log_thresh1));
 981 }
 982 
 983 static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
 984 {
 985         unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
 986 
 987         if (test_and_clear_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags))
 988                 return 1;
 989 
 990         return used_blocks + atomic_read(&sdp->sd_log_blks_needed) >=
 991                 atomic_read(&sdp->sd_log_thresh2);
 992 }
 993 
 994 /**
 995  * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
 996  * @sdp: Pointer to GFS2 superblock
 997  *
 998  * Also, periodically check to make sure that we're using the most recent
 999  * journal index.
1000  */
1001 
1002 int gfs2_logd(void *data)
1003 {
1004         struct gfs2_sbd *sdp = data;
1005         unsigned long t = 1;
1006         DEFINE_WAIT(wait);
1007         bool did_flush;
1008 
1009         while (!kthread_should_stop()) {
1010 
1011                 /* Check for errors writing to the journal */
1012                 if (sdp->sd_log_error) {
1013                         gfs2_lm_withdraw(sdp,
1014                                          "GFS2: fsid=%s: error %d: "
1015                                          "withdrawing the file system to "
1016                                          "prevent further damage.\n",
1017                                          sdp->sd_fsname, sdp->sd_log_error);
1018                 }
1019 
1020                 did_flush = false;
1021                 if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {
1022                         gfs2_ail1_empty(sdp);
1023                         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
1024                                        GFS2_LFC_LOGD_JFLUSH_REQD);
1025                         did_flush = true;
1026                 }
1027 
1028                 if (gfs2_ail_flush_reqd(sdp)) {
1029                         gfs2_ail1_start(sdp);
1030                         gfs2_ail1_wait(sdp);
1031                         gfs2_ail1_empty(sdp);
1032                         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
1033                                        GFS2_LFC_LOGD_AIL_FLUSH_REQD);
1034                         did_flush = true;
1035                 }
1036 
1037                 if (!gfs2_ail_flush_reqd(sdp) || did_flush)
1038                         wake_up(&sdp->sd_log_waitq);
1039 
1040                 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
1041 
1042                 try_to_freeze();
1043 
1044                 do {
1045                         prepare_to_wait(&sdp->sd_logd_waitq, &wait,
1046                                         TASK_INTERRUPTIBLE);
1047                         if (!gfs2_ail_flush_reqd(sdp) &&
1048                             !gfs2_jrnl_flush_reqd(sdp) &&
1049                             !kthread_should_stop())
1050                                 t = schedule_timeout(t);
1051                 } while(t && !gfs2_ail_flush_reqd(sdp) &&
1052                         !gfs2_jrnl_flush_reqd(sdp) &&
1053                         !kthread_should_stop());
1054                 finish_wait(&sdp->sd_logd_waitq, &wait);
1055         }
1056 
1057         return 0;
1058 }
1059
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root/fs/gfs2/log.c

DEFINITIONS
