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 static void gfs2_log_shutdown(struct gfs2_sbd *sdp); 35 36 /** 37 * gfs2_struct2blk - compute stuff 38 * @sdp: the filesystem 39 * @nstruct: the number of structures 40 * 41 * Compute the number of log descriptor blocks needed to hold a certain number 42 * of structures of a certain size. 43 * 44 * Returns: the number of blocks needed (minimum is always 1) 45 */ 46 47 unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct) 48 { 49 unsigned int blks; 50 unsigned int first, second; 51 52 blks = 1; 53 first = sdp->sd_ldptrs; 54 55 if (nstruct > first) { 56 second = sdp->sd_inptrs; 57 blks += DIV_ROUND_UP(nstruct - first, second); 58 } 59 60 return blks; 61 } 62 63 /** 64 * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters 65 * @mapping: The associated mapping (maybe NULL) 66 * @bd: The gfs2_bufdata to remove 67 * 68 * The ail lock _must_ be held when calling this function 69 * 70 */ 71 72 static void gfs2_remove_from_ail(struct gfs2_bufdata *bd) 73 { 74 bd->bd_tr = NULL; 75 list_del_init(&bd->bd_ail_st_list); 76 list_del_init(&bd->bd_ail_gl_list); 77 atomic_dec(&bd->bd_gl->gl_ail_count); 78 brelse(bd->bd_bh); 79 } 80 81 /** 82 * gfs2_ail1_start_one - Start I/O on a part of the AIL 83 * @sdp: the filesystem 84 * @wbc: The writeback control structure 85 * @ai: The ail structure 86 * 87 */ 88 89 static int gfs2_ail1_start_one(struct gfs2_sbd *sdp, 90 struct writeback_control *wbc, 91 struct gfs2_trans *tr, 92 bool *withdraw) 93 __releases(&sdp->sd_ail_lock) 94 __acquires(&sdp->sd_ail_lock) 95 { 96 struct gfs2_glock *gl = NULL; 97 struct address_space *mapping; 98 struct gfs2_bufdata *bd, *s; 99 struct buffer_head *bh; 100 101 list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list, bd_ail_st_list) { 102 bh = bd->bd_bh; 103 104 gfs2_assert(sdp, bd->bd_tr == tr); 105 106 if (!buffer_busy(bh)) { 107 if (!buffer_uptodate(bh) && 108 !test_and_set_bit(SDF_AIL1_IO_ERROR, 109 &sdp->sd_flags)) { 110 gfs2_io_error_bh(sdp, bh); 111 *withdraw = true; 112 } 113 list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list); 114 continue; 115 } 116 117 if (!buffer_dirty(bh)) 118 continue; 119 if (gl == bd->bd_gl) 120 continue; 121 gl = bd->bd_gl; 122 list_move(&bd->bd_ail_st_list, &tr->tr_ail1_list); 123 mapping = bh->b_page->mapping; 124 if (!mapping) 125 continue; 126 spin_unlock(&sdp->sd_ail_lock); 127 generic_writepages(mapping, wbc); 128 spin_lock(&sdp->sd_ail_lock); 129 if (wbc->nr_to_write <= 0) 130 break; 131 return 1; 132 } 133 134 return 0; 135 } 136 137 138 /** 139 * gfs2_ail1_flush - start writeback of some ail1 entries 140 * @sdp: The super block 141 * @wbc: The writeback control structure 142 * 143 * Writes back some ail1 entries, according to the limits in the 144 * writeback control structure 145 */ 146 147 void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc) 148 { 149 struct list_head *head = &sdp->sd_ail1_list; 150 struct gfs2_trans *tr; 151 struct blk_plug plug; 152 bool withdraw = false; 153 154 trace_gfs2_ail_flush(sdp, wbc, 1); 155 blk_start_plug(&plug); 156 spin_lock(&sdp->sd_ail_lock); 157 restart: 158 list_for_each_entry_reverse(tr, head, tr_list) { 159 if (wbc->nr_to_write <= 0) 160 break; 161 if (gfs2_ail1_start_one(sdp, wbc, tr, &withdraw) && 162 !gfs2_withdrawn(sdp)) 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_committed_revoke > 0) 473 reserved += gfs2_struct2blk(sdp, sdp->sd_log_committed_revoke); 474 /* One for the overall header */ 475 if (reserved) 476 reserved++; 477 return reserved; 478 } 479 480 static unsigned int current_tail(struct gfs2_sbd *sdp) 481 { 482 struct gfs2_trans *tr; 483 unsigned int tail; 484 485 spin_lock(&sdp->sd_ail_lock); 486 487 if (list_empty(&sdp->sd_ail1_list)) { 488 tail = sdp->sd_log_head; 489 } else { 490 tr = list_entry(sdp->sd_ail1_list.prev, struct gfs2_trans, 491 tr_list); 492 tail = tr->tr_first; 493 } 494 495 spin_unlock(&sdp->sd_ail_lock); 496 497 return tail; 498 } 499 500 static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail) 501 { 502 unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); 503 504 ail2_empty(sdp, new_tail); 505 506 atomic_add(dist, &sdp->sd_log_blks_free); 507 trace_gfs2_log_blocks(sdp, dist); 508 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= 509 sdp->sd_jdesc->jd_blocks); 510 511 sdp->sd_log_tail = new_tail; 512 } 513 514 515 static void log_flush_wait(struct gfs2_sbd *sdp) 516 { 517 DEFINE_WAIT(wait); 518 519 if (atomic_read(&sdp->sd_log_in_flight)) { 520 do { 521 prepare_to_wait(&sdp->sd_log_flush_wait, &wait, 522 TASK_UNINTERRUPTIBLE); 523 if (atomic_read(&sdp->sd_log_in_flight)) 524 io_schedule(); 525 } while(atomic_read(&sdp->sd_log_in_flight)); 526 finish_wait(&sdp->sd_log_flush_wait, &wait); 527 } 528 } 529 530 static int ip_cmp(void *priv, struct list_head *a, struct list_head *b) 531 { 532 struct gfs2_inode *ipa, *ipb; 533 534 ipa = list_entry(a, struct gfs2_inode, i_ordered); 535 ipb = list_entry(b, struct gfs2_inode, i_ordered); 536 537 if (ipa->i_no_addr < ipb->i_no_addr) 538 return -1; 539 if (ipa->i_no_addr > ipb->i_no_addr) 540 return 1; 541 return 0; 542 } 543 544 static void gfs2_ordered_write(struct gfs2_sbd *sdp) 545 { 546 struct gfs2_inode *ip; 547 LIST_HEAD(written); 548 549 spin_lock(&sdp->sd_ordered_lock); 550 list_sort(NULL, &sdp->sd_log_ordered, &ip_cmp); 551 while (!list_empty(&sdp->sd_log_ordered)) { 552 ip = list_entry(sdp->sd_log_ordered.next, struct gfs2_inode, i_ordered); 553 if (ip->i_inode.i_mapping->nrpages == 0) { 554 test_and_clear_bit(GIF_ORDERED, &ip->i_flags); 555 list_del(&ip->i_ordered); 556 continue; 557 } 558 list_move(&ip->i_ordered, &written); 559 spin_unlock(&sdp->sd_ordered_lock); 560 filemap_fdatawrite(ip->i_inode.i_mapping); 561 spin_lock(&sdp->sd_ordered_lock); 562 } 563 list_splice(&written, &sdp->sd_log_ordered); 564 spin_unlock(&sdp->sd_ordered_lock); 565 } 566 567 static void gfs2_ordered_wait(struct gfs2_sbd *sdp) 568 { 569 struct gfs2_inode *ip; 570 571 spin_lock(&sdp->sd_ordered_lock); 572 while (!list_empty(&sdp->sd_log_ordered)) { 573 ip = list_entry(sdp->sd_log_ordered.next, struct gfs2_inode, i_ordered); 574 list_del(&ip->i_ordered); 575 WARN_ON(!test_and_clear_bit(GIF_ORDERED, &ip->i_flags)); 576 if (ip->i_inode.i_mapping->nrpages == 0) 577 continue; 578 spin_unlock(&sdp->sd_ordered_lock); 579 filemap_fdatawait(ip->i_inode.i_mapping); 580 spin_lock(&sdp->sd_ordered_lock); 581 } 582 spin_unlock(&sdp->sd_ordered_lock); 583 } 584 585 void gfs2_ordered_del_inode(struct gfs2_inode *ip) 586 { 587 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 588 589 spin_lock(&sdp->sd_ordered_lock); 590 if (test_and_clear_bit(GIF_ORDERED, &ip->i_flags)) 591 list_del(&ip->i_ordered); 592 spin_unlock(&sdp->sd_ordered_lock); 593 } 594 595 void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 596 { 597 struct buffer_head *bh = bd->bd_bh; 598 struct gfs2_glock *gl = bd->bd_gl; 599 600 bh->b_private = NULL; 601 bd->bd_blkno = bh->b_blocknr; 602 gfs2_remove_from_ail(bd); /* drops ref on bh */ 603 bd->bd_bh = NULL; 604 sdp->sd_log_num_revoke++; 605 if (atomic_inc_return(&gl->gl_revokes) == 1) 606 gfs2_glock_hold(gl); 607 set_bit(GLF_LFLUSH, &gl->gl_flags); 608 list_add(&bd->bd_list, &sdp->sd_log_revokes); 609 } 610 611 void gfs2_glock_remove_revoke(struct gfs2_glock *gl) 612 { 613 if (atomic_dec_return(&gl->gl_revokes) == 0) { 614 clear_bit(GLF_LFLUSH, &gl->gl_flags); 615 gfs2_glock_queue_put(gl); 616 } 617 } 618 619 void gfs2_write_revokes(struct gfs2_sbd *sdp) 620 { 621 struct gfs2_trans *tr; 622 struct gfs2_bufdata *bd, *tmp; 623 int have_revokes = 0; 624 int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 625 626 gfs2_ail1_empty(sdp); 627 spin_lock(&sdp->sd_ail_lock); 628 list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) { 629 list_for_each_entry(bd, &tr->tr_ail2_list, bd_ail_st_list) { 630 if (list_empty(&bd->bd_list)) { 631 have_revokes = 1; 632 goto done; 633 } 634 } 635 } 636 done: 637 spin_unlock(&sdp->sd_ail_lock); 638 if (have_revokes == 0) 639 return; 640 while (sdp->sd_log_num_revoke > max_revokes) 641 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64); 642 max_revokes -= sdp->sd_log_num_revoke; 643 if (!sdp->sd_log_num_revoke) { 644 atomic_dec(&sdp->sd_log_blks_free); 645 /* If no blocks have been reserved, we need to also 646 * reserve a block for the header */ 647 if (!sdp->sd_log_blks_reserved) 648 atomic_dec(&sdp->sd_log_blks_free); 649 } 650 gfs2_log_lock(sdp); 651 spin_lock(&sdp->sd_ail_lock); 652 list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) { 653 list_for_each_entry_safe(bd, tmp, &tr->tr_ail2_list, bd_ail_st_list) { 654 if (max_revokes == 0) 655 goto out_of_blocks; 656 if (!list_empty(&bd->bd_list)) 657 continue; 658 gfs2_add_revoke(sdp, bd); 659 max_revokes--; 660 } 661 } 662 out_of_blocks: 663 spin_unlock(&sdp->sd_ail_lock); 664 gfs2_log_unlock(sdp); 665 666 if (!sdp->sd_log_num_revoke) { 667 atomic_inc(&sdp->sd_log_blks_free); 668 if (!sdp->sd_log_blks_reserved) 669 atomic_inc(&sdp->sd_log_blks_free); 670 } 671 } 672 673 /** 674 * gfs2_write_log_header - Write a journal log header buffer at lblock 675 * @sdp: The GFS2 superblock 676 * @jd: journal descriptor of the journal to which we are writing 677 * @seq: sequence number 678 * @tail: tail of the log 679 * @lblock: value for lh_blkno (block number relative to start of journal) 680 * @flags: log header flags GFS2_LOG_HEAD_* 681 * @op_flags: flags to pass to the bio 682 * 683 * Returns: the initialized log buffer descriptor 684 */ 685 686 void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, 687 u64 seq, u32 tail, u32 lblock, u32 flags, 688 int op_flags) 689 { 690 struct gfs2_log_header *lh; 691 u32 hash, crc; 692 struct page *page; 693 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 694 struct timespec64 tv; 695 struct super_block *sb = sdp->sd_vfs; 696 u64 dblock; 697 698 if (gfs2_withdrawn(sdp)) 699 goto out; 700 701 page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 702 lh = page_address(page); 703 clear_page(lh); 704 705 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 706 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); 707 lh->lh_header.__pad0 = cpu_to_be64(0); 708 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); 709 lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 710 lh->lh_sequence = cpu_to_be64(seq); 711 lh->lh_flags = cpu_to_be32(flags); 712 lh->lh_tail = cpu_to_be32(tail); 713 lh->lh_blkno = cpu_to_be32(lblock); 714 hash = ~crc32(~0, lh, LH_V1_SIZE); 715 lh->lh_hash = cpu_to_be32(hash); 716 717 ktime_get_coarse_real_ts64(&tv); 718 lh->lh_nsec = cpu_to_be32(tv.tv_nsec); 719 lh->lh_sec = cpu_to_be64(tv.tv_sec); 720 if (!list_empty(&jd->extent_list)) 721 dblock = gfs2_log_bmap(jd, lblock); 722 else { 723 int ret = gfs2_lblk_to_dblk(jd->jd_inode, lblock, &dblock); 724 if (gfs2_assert_withdraw(sdp, ret == 0)) 725 return; 726 } 727 lh->lh_addr = cpu_to_be64(dblock); 728 lh->lh_jinode = cpu_to_be64(GFS2_I(jd->jd_inode)->i_no_addr); 729 730 /* We may only write local statfs, quota, etc., when writing to our 731 own journal. The values are left 0 when recovering a journal 732 different from our own. */ 733 if (!(flags & GFS2_LOG_HEAD_RECOVERY)) { 734 lh->lh_statfs_addr = 735 cpu_to_be64(GFS2_I(sdp->sd_sc_inode)->i_no_addr); 736 lh->lh_quota_addr = 737 cpu_to_be64(GFS2_I(sdp->sd_qc_inode)->i_no_addr); 738 739 spin_lock(&sdp->sd_statfs_spin); 740 lh->lh_local_total = cpu_to_be64(l_sc->sc_total); 741 lh->lh_local_free = cpu_to_be64(l_sc->sc_free); 742 lh->lh_local_dinodes = cpu_to_be64(l_sc->sc_dinodes); 743 spin_unlock(&sdp->sd_statfs_spin); 744 } 745 746 BUILD_BUG_ON(offsetof(struct gfs2_log_header, lh_crc) != LH_V1_SIZE); 747 748 crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4, 749 sb->s_blocksize - LH_V1_SIZE - 4); 750 lh->lh_crc = cpu_to_be32(crc); 751 752 gfs2_log_write(sdp, page, sb->s_blocksize, 0, dblock); 753 gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE | op_flags); 754 out: 755 log_flush_wait(sdp); 756 } 757 758 /** 759 * log_write_header - Get and initialize a journal header buffer 760 * @sdp: The GFS2 superblock 761 * @flags: The log header flags, including log header origin 762 * 763 * Returns: the initialized log buffer descriptor 764 */ 765 766 static void log_write_header(struct gfs2_sbd *sdp, u32 flags) 767 { 768 unsigned int tail; 769 int op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC; 770 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 771 772 gfs2_assert_withdraw(sdp, (state != SFS_FROZEN)); 773 tail = current_tail(sdp); 774 775 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) { 776 gfs2_ordered_wait(sdp); 777 log_flush_wait(sdp); 778 op_flags = REQ_SYNC | REQ_META | REQ_PRIO; 779 } 780 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); 781 gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, tail, 782 sdp->sd_log_flush_head, flags, op_flags); 783 gfs2_log_incr_head(sdp); 784 785 if (sdp->sd_log_tail != tail) 786 log_pull_tail(sdp, tail); 787 } 788 789 /** 790 * gfs2_log_flush - flush incore transaction(s) 791 * @sdp: the filesystem 792 * @gl: The glock structure to flush. If NULL, flush the whole incore log 793 * @flags: The log header flags: GFS2_LOG_HEAD_FLUSH_* and debug flags 794 * 795 */ 796 797 void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags) 798 { 799 struct gfs2_trans *tr; 800 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 801 802 down_write(&sdp->sd_log_flush_lock); 803 804 /* Log might have been flushed while we waited for the flush lock */ 805 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) { 806 up_write(&sdp->sd_log_flush_lock); 807 return; 808 } 809 trace_gfs2_log_flush(sdp, 1, flags); 810 811 if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN) 812 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 813 814 sdp->sd_log_flush_head = sdp->sd_log_head; 815 tr = sdp->sd_log_tr; 816 if (tr) { 817 sdp->sd_log_tr = NULL; 818 INIT_LIST_HEAD(&tr->tr_ail1_list); 819 INIT_LIST_HEAD(&tr->tr_ail2_list); 820 tr->tr_first = sdp->sd_log_flush_head; 821 if (unlikely (state == SFS_FROZEN)) 822 gfs2_assert_withdraw(sdp, !tr->tr_num_buf_new && !tr->tr_num_databuf_new); 823 } 824 825 if (unlikely(state == SFS_FROZEN)) 826 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 827 gfs2_assert_withdraw(sdp, 828 sdp->sd_log_num_revoke == sdp->sd_log_committed_revoke); 829 830 gfs2_ordered_write(sdp); 831 lops_before_commit(sdp, tr); 832 gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE); 833 834 if (sdp->sd_log_head != sdp->sd_log_flush_head) { 835 log_flush_wait(sdp); 836 log_write_header(sdp, flags); 837 } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){ 838 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */ 839 trace_gfs2_log_blocks(sdp, -1); 840 log_write_header(sdp, flags); 841 } 842 lops_after_commit(sdp, tr); 843 844 gfs2_log_lock(sdp); 845 sdp->sd_log_head = sdp->sd_log_flush_head; 846 sdp->sd_log_blks_reserved = 0; 847 sdp->sd_log_committed_revoke = 0; 848 849 spin_lock(&sdp->sd_ail_lock); 850 if (tr && !list_empty(&tr->tr_ail1_list)) { 851 list_add(&tr->tr_list, &sdp->sd_ail1_list); 852 tr = NULL; 853 } 854 spin_unlock(&sdp->sd_ail_lock); 855 gfs2_log_unlock(sdp); 856 857 if (!(flags & GFS2_LOG_HEAD_FLUSH_NORMAL)) { 858 if (!sdp->sd_log_idle) { 859 for (;;) { 860 gfs2_ail1_start(sdp); 861 gfs2_ail1_wait(sdp); 862 if (gfs2_ail1_empty(sdp)) 863 break; 864 } 865 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */ 866 trace_gfs2_log_blocks(sdp, -1); 867 log_write_header(sdp, flags); 868 sdp->sd_log_head = sdp->sd_log_flush_head; 869 } 870 if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 871 GFS2_LOG_HEAD_FLUSH_FREEZE)) 872 gfs2_log_shutdown(sdp); 873 if (flags & GFS2_LOG_HEAD_FLUSH_FREEZE) 874 atomic_set(&sdp->sd_freeze_state, SFS_FROZEN); 875 } 876 877 trace_gfs2_log_flush(sdp, 0, flags); 878 up_write(&sdp->sd_log_flush_lock); 879 880 kfree(tr); 881 } 882 883 /** 884 * gfs2_merge_trans - Merge a new transaction into a cached transaction 885 * @old: Original transaction to be expanded 886 * @new: New transaction to be merged 887 */ 888 889 static void gfs2_merge_trans(struct gfs2_trans *old, struct gfs2_trans *new) 890 { 891 WARN_ON_ONCE(!test_bit(TR_ATTACHED, &old->tr_flags)); 892 893 old->tr_num_buf_new += new->tr_num_buf_new; 894 old->tr_num_databuf_new += new->tr_num_databuf_new; 895 old->tr_num_buf_rm += new->tr_num_buf_rm; 896 old->tr_num_databuf_rm += new->tr_num_databuf_rm; 897 old->tr_num_revoke += new->tr_num_revoke; 898 old->tr_num_revoke_rm += new->tr_num_revoke_rm; 899 900 list_splice_tail_init(&new->tr_databuf, &old->tr_databuf); 901 list_splice_tail_init(&new->tr_buf, &old->tr_buf); 902 } 903 904 static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 905 { 906 unsigned int reserved; 907 unsigned int unused; 908 unsigned int maxres; 909 910 gfs2_log_lock(sdp); 911 912 if (sdp->sd_log_tr) { 913 gfs2_merge_trans(sdp->sd_log_tr, tr); 914 } else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) { 915 gfs2_assert_withdraw(sdp, test_bit(TR_ALLOCED, &tr->tr_flags)); 916 sdp->sd_log_tr = tr; 917 set_bit(TR_ATTACHED, &tr->tr_flags); 918 } 919 920 sdp->sd_log_committed_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; 921 reserved = calc_reserved(sdp); 922 maxres = sdp->sd_log_blks_reserved + tr->tr_reserved; 923 gfs2_assert_withdraw(sdp, maxres >= reserved); 924 unused = maxres - reserved; 925 atomic_add(unused, &sdp->sd_log_blks_free); 926 trace_gfs2_log_blocks(sdp, unused); 927 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= 928 sdp->sd_jdesc->jd_blocks); 929 sdp->sd_log_blks_reserved = reserved; 930 931 gfs2_log_unlock(sdp); 932 } 933 934 /** 935 * gfs2_log_commit - Commit a transaction to the log 936 * @sdp: the filesystem 937 * @tr: the transaction 938 * 939 * We wake up gfs2_logd if the number of pinned blocks exceed thresh1 940 * or the total number of used blocks (pinned blocks plus AIL blocks) 941 * is greater than thresh2. 942 * 943 * At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of 944 * journal size. 945 * 946 * Returns: errno 947 */ 948 949 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 950 { 951 log_refund(sdp, tr); 952 953 if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) || 954 ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) > 955 atomic_read(&sdp->sd_log_thresh2))) 956 wake_up(&sdp->sd_logd_waitq); 957 } 958 959 /** 960 * gfs2_log_shutdown - write a shutdown header into a journal 961 * @sdp: the filesystem 962 * 963 */ 964 965 static void gfs2_log_shutdown(struct gfs2_sbd *sdp) 966 { 967 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); 968 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 969 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); 970 971 sdp->sd_log_flush_head = sdp->sd_log_head; 972 973 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT | GFS2_LFC_SHUTDOWN); 974 975 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); 976 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); 977 978 sdp->sd_log_head = sdp->sd_log_flush_head; 979 sdp->sd_log_tail = sdp->sd_log_head; 980 } 981 982 static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp) 983 { 984 return (atomic_read(&sdp->sd_log_pinned) + 985 atomic_read(&sdp->sd_log_blks_needed) >= 986 atomic_read(&sdp->sd_log_thresh1)); 987 } 988 989 static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp) 990 { 991 unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free); 992 993 if (test_and_clear_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags)) 994 return 1; 995 996 return used_blocks + atomic_read(&sdp->sd_log_blks_needed) >= 997 atomic_read(&sdp->sd_log_thresh2); 998 } 999 1000 /** 1001 * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks 1002 * @sdp: Pointer to GFS2 superblock 1003 * 1004 * Also, periodically check to make sure that we're using the most recent 1005 * journal index. 1006 */ 1007 1008 int gfs2_logd(void *data) 1009 { 1010 struct gfs2_sbd *sdp = data; 1011 unsigned long t = 1; 1012 DEFINE_WAIT(wait); 1013 bool did_flush; 1014 1015 while (!kthread_should_stop()) { 1016 1017 /* Check for errors writing to the journal */ 1018 if (sdp->sd_log_error) { 1019 gfs2_lm_withdraw(sdp, 1020 "GFS2: fsid=%s: error %d: " 1021 "withdrawing the file system to " 1022 "prevent further damage.\n", 1023 sdp->sd_fsname, sdp->sd_log_error); 1024 } 1025 1026 did_flush = false; 1027 if (gfs2_jrnl_flush_reqd(sdp) || t == 0) { 1028 gfs2_ail1_empty(sdp); 1029 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 1030 GFS2_LFC_LOGD_JFLUSH_REQD); 1031 did_flush = true; 1032 } 1033 1034 if (gfs2_ail_flush_reqd(sdp)) { 1035 gfs2_ail1_start(sdp); 1036 gfs2_ail1_wait(sdp); 1037 gfs2_ail1_empty(sdp); 1038 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 1039 GFS2_LFC_LOGD_AIL_FLUSH_REQD); 1040 did_flush = true; 1041 } 1042 1043 if (!gfs2_ail_flush_reqd(sdp) || did_flush) 1044 wake_up(&sdp->sd_log_waitq); 1045 1046 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ; 1047 1048 try_to_freeze(); 1049 1050 do { 1051 prepare_to_wait(&sdp->sd_logd_waitq, &wait, 1052 TASK_INTERRUPTIBLE); 1053 if (!gfs2_ail_flush_reqd(sdp) && 1054 !gfs2_jrnl_flush_reqd(sdp) && 1055 !kthread_should_stop()) 1056 t = schedule_timeout(t); 1057 } while(t && !gfs2_ail_flush_reqd(sdp) && 1058 !gfs2_jrnl_flush_reqd(sdp) && 1059 !kthread_should_stop()); 1060 finish_wait(&sdp->sd_logd_waitq, &wait); 1061 } 1062 1063 return 0; 1064 } 1065 1066