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 static 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 bh->b_private = NULL; 602 bd->bd_blkno = bh->b_blocknr; 603 gfs2_remove_from_ail(bd); /* drops ref on bh */ 604 bd->bd_bh = NULL; 605 sdp->sd_log_num_revoke++; 606 if (atomic_inc_return(&gl->gl_revokes) == 1) 607 gfs2_glock_hold(gl); 608 set_bit(GLF_LFLUSH, &gl->gl_flags); 609 list_add(&bd->bd_list, &sdp->sd_log_revokes); 610 } 611 612 void gfs2_write_revokes(struct gfs2_sbd *sdp) 613 { 614 struct gfs2_trans *tr; 615 struct gfs2_bufdata *bd, *tmp; 616 int have_revokes = 0; 617 int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 618 619 gfs2_ail1_empty(sdp); 620 spin_lock(&sdp->sd_ail_lock); 621 list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) { 622 list_for_each_entry(bd, &tr->tr_ail2_list, bd_ail_st_list) { 623 if (list_empty(&bd->bd_list)) { 624 have_revokes = 1; 625 goto done; 626 } 627 } 628 } 629 done: 630 spin_unlock(&sdp->sd_ail_lock); 631 if (have_revokes == 0) 632 return; 633 while (sdp->sd_log_num_revoke > max_revokes) 634 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64); 635 max_revokes -= sdp->sd_log_num_revoke; 636 if (!sdp->sd_log_num_revoke) { 637 atomic_dec(&sdp->sd_log_blks_free); 638 /* If no blocks have been reserved, we need to also 639 * reserve a block for the header */ 640 if (!sdp->sd_log_blks_reserved) 641 atomic_dec(&sdp->sd_log_blks_free); 642 } 643 gfs2_log_lock(sdp); 644 spin_lock(&sdp->sd_ail_lock); 645 list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) { 646 list_for_each_entry_safe(bd, tmp, &tr->tr_ail2_list, bd_ail_st_list) { 647 if (max_revokes == 0) 648 goto out_of_blocks; 649 if (!list_empty(&bd->bd_list)) 650 continue; 651 gfs2_add_revoke(sdp, bd); 652 max_revokes--; 653 } 654 } 655 out_of_blocks: 656 spin_unlock(&sdp->sd_ail_lock); 657 gfs2_log_unlock(sdp); 658 659 if (!sdp->sd_log_num_revoke) { 660 atomic_inc(&sdp->sd_log_blks_free); 661 if (!sdp->sd_log_blks_reserved) 662 atomic_inc(&sdp->sd_log_blks_free); 663 } 664 } 665 666 /** 667 * gfs2_write_log_header - Write a journal log header buffer at lblock 668 * @sdp: The GFS2 superblock 669 * @jd: journal descriptor of the journal to which we are writing 670 * @seq: sequence number 671 * @tail: tail of the log 672 * @lblock: value for lh_blkno (block number relative to start of journal) 673 * @flags: log header flags GFS2_LOG_HEAD_* 674 * @op_flags: flags to pass to the bio 675 * 676 * Returns: the initialized log buffer descriptor 677 */ 678 679 void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, 680 u64 seq, u32 tail, u32 lblock, u32 flags, 681 int op_flags) 682 { 683 struct gfs2_log_header *lh; 684 u32 hash, crc; 685 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 686 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 687 struct timespec64 tv; 688 struct super_block *sb = sdp->sd_vfs; 689 u64 dblock; 690 691 lh = page_address(page); 692 clear_page(lh); 693 694 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 695 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); 696 lh->lh_header.__pad0 = cpu_to_be64(0); 697 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); 698 lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 699 lh->lh_sequence = cpu_to_be64(seq); 700 lh->lh_flags = cpu_to_be32(flags); 701 lh->lh_tail = cpu_to_be32(tail); 702 lh->lh_blkno = cpu_to_be32(lblock); 703 hash = ~crc32(~0, lh, LH_V1_SIZE); 704 lh->lh_hash = cpu_to_be32(hash); 705 706 ktime_get_coarse_real_ts64(&tv); 707 lh->lh_nsec = cpu_to_be32(tv.tv_nsec); 708 lh->lh_sec = cpu_to_be64(tv.tv_sec); 709 if (!list_empty(&jd->extent_list)) 710 dblock = gfs2_log_bmap(sdp); 711 else { 712 int ret = gfs2_lblk_to_dblk(jd->jd_inode, lblock, &dblock); 713 if (gfs2_assert_withdraw(sdp, ret == 0)) 714 return; 715 } 716 lh->lh_addr = cpu_to_be64(dblock); 717 lh->lh_jinode = cpu_to_be64(GFS2_I(jd->jd_inode)->i_no_addr); 718 719 /* We may only write local statfs, quota, etc., when writing to our 720 own journal. The values are left 0 when recovering a journal 721 different from our own. */ 722 if (!(flags & GFS2_LOG_HEAD_RECOVERY)) { 723 lh->lh_statfs_addr = 724 cpu_to_be64(GFS2_I(sdp->sd_sc_inode)->i_no_addr); 725 lh->lh_quota_addr = 726 cpu_to_be64(GFS2_I(sdp->sd_qc_inode)->i_no_addr); 727 728 spin_lock(&sdp->sd_statfs_spin); 729 lh->lh_local_total = cpu_to_be64(l_sc->sc_total); 730 lh->lh_local_free = cpu_to_be64(l_sc->sc_free); 731 lh->lh_local_dinodes = cpu_to_be64(l_sc->sc_dinodes); 732 spin_unlock(&sdp->sd_statfs_spin); 733 } 734 735 BUILD_BUG_ON(offsetof(struct gfs2_log_header, lh_crc) != LH_V1_SIZE); 736 737 crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4, 738 sb->s_blocksize - LH_V1_SIZE - 4); 739 lh->lh_crc = cpu_to_be32(crc); 740 741 gfs2_log_write(sdp, page, sb->s_blocksize, 0, dblock); 742 gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE | op_flags); 743 log_flush_wait(sdp); 744 } 745 746 /** 747 * log_write_header - Get and initialize a journal header buffer 748 * @sdp: The GFS2 superblock 749 * @flags: The log header flags, including log header origin 750 * 751 * Returns: the initialized log buffer descriptor 752 */ 753 754 static void log_write_header(struct gfs2_sbd *sdp, u32 flags) 755 { 756 unsigned int tail; 757 int op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC; 758 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 759 760 gfs2_assert_withdraw(sdp, (state != SFS_FROZEN)); 761 tail = current_tail(sdp); 762 763 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) { 764 gfs2_ordered_wait(sdp); 765 log_flush_wait(sdp); 766 op_flags = REQ_SYNC | REQ_META | REQ_PRIO; 767 } 768 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); 769 gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, tail, 770 sdp->sd_log_flush_head, flags, op_flags); 771 772 if (sdp->sd_log_tail != tail) 773 log_pull_tail(sdp, tail); 774 } 775 776 /** 777 * gfs2_log_flush - flush incore transaction(s) 778 * @sdp: the filesystem 779 * @gl: The glock structure to flush. If NULL, flush the whole incore log 780 * @flags: The log header flags: GFS2_LOG_HEAD_FLUSH_* and debug flags 781 * 782 */ 783 784 void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags) 785 { 786 struct gfs2_trans *tr; 787 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 788 789 down_write(&sdp->sd_log_flush_lock); 790 791 /* Log might have been flushed while we waited for the flush lock */ 792 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) { 793 up_write(&sdp->sd_log_flush_lock); 794 return; 795 } 796 trace_gfs2_log_flush(sdp, 1, flags); 797 798 if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN) 799 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 800 801 sdp->sd_log_flush_head = sdp->sd_log_head; 802 tr = sdp->sd_log_tr; 803 if (tr) { 804 sdp->sd_log_tr = NULL; 805 INIT_LIST_HEAD(&tr->tr_ail1_list); 806 INIT_LIST_HEAD(&tr->tr_ail2_list); 807 tr->tr_first = sdp->sd_log_flush_head; 808 if (unlikely (state == SFS_FROZEN)) 809 gfs2_assert_withdraw(sdp, !tr->tr_num_buf_new && !tr->tr_num_databuf_new); 810 } 811 812 if (unlikely(state == SFS_FROZEN)) 813 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 814 gfs2_assert_withdraw(sdp, 815 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); 816 817 gfs2_ordered_write(sdp); 818 lops_before_commit(sdp, tr); 819 gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE); 820 821 if (sdp->sd_log_head != sdp->sd_log_flush_head) { 822 log_flush_wait(sdp); 823 log_write_header(sdp, flags); 824 } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){ 825 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */ 826 trace_gfs2_log_blocks(sdp, -1); 827 log_write_header(sdp, flags); 828 } 829 lops_after_commit(sdp, tr); 830 831 gfs2_log_lock(sdp); 832 sdp->sd_log_head = sdp->sd_log_flush_head; 833 sdp->sd_log_blks_reserved = 0; 834 sdp->sd_log_commited_revoke = 0; 835 836 spin_lock(&sdp->sd_ail_lock); 837 if (tr && !list_empty(&tr->tr_ail1_list)) { 838 list_add(&tr->tr_list, &sdp->sd_ail1_list); 839 tr = NULL; 840 } 841 spin_unlock(&sdp->sd_ail_lock); 842 gfs2_log_unlock(sdp); 843 844 if (!(flags & GFS2_LOG_HEAD_FLUSH_NORMAL)) { 845 if (!sdp->sd_log_idle) { 846 for (;;) { 847 gfs2_ail1_start(sdp); 848 gfs2_ail1_wait(sdp); 849 if (gfs2_ail1_empty(sdp)) 850 break; 851 } 852 atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */ 853 trace_gfs2_log_blocks(sdp, -1); 854 log_write_header(sdp, flags); 855 sdp->sd_log_head = sdp->sd_log_flush_head; 856 } 857 if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 858 GFS2_LOG_HEAD_FLUSH_FREEZE)) 859 gfs2_log_shutdown(sdp); 860 if (flags & GFS2_LOG_HEAD_FLUSH_FREEZE) 861 atomic_set(&sdp->sd_freeze_state, SFS_FROZEN); 862 } 863 864 trace_gfs2_log_flush(sdp, 0, flags); 865 up_write(&sdp->sd_log_flush_lock); 866 867 kfree(tr); 868 } 869 870 /** 871 * gfs2_merge_trans - Merge a new transaction into a cached transaction 872 * @old: Original transaction to be expanded 873 * @new: New transaction to be merged 874 */ 875 876 static void gfs2_merge_trans(struct gfs2_trans *old, struct gfs2_trans *new) 877 { 878 WARN_ON_ONCE(!test_bit(TR_ATTACHED, &old->tr_flags)); 879 880 old->tr_num_buf_new += new->tr_num_buf_new; 881 old->tr_num_databuf_new += new->tr_num_databuf_new; 882 old->tr_num_buf_rm += new->tr_num_buf_rm; 883 old->tr_num_databuf_rm += new->tr_num_databuf_rm; 884 old->tr_num_revoke += new->tr_num_revoke; 885 886 list_splice_tail_init(&new->tr_databuf, &old->tr_databuf); 887 list_splice_tail_init(&new->tr_buf, &old->tr_buf); 888 } 889 890 static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 891 { 892 unsigned int reserved; 893 unsigned int unused; 894 unsigned int maxres; 895 896 gfs2_log_lock(sdp); 897 898 if (sdp->sd_log_tr) { 899 gfs2_merge_trans(sdp->sd_log_tr, tr); 900 } else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) { 901 gfs2_assert_withdraw(sdp, test_bit(TR_ALLOCED, &tr->tr_flags)); 902 sdp->sd_log_tr = tr; 903 set_bit(TR_ATTACHED, &tr->tr_flags); 904 } 905 906 sdp->sd_log_commited_revoke += tr->tr_num_revoke; 907 reserved = calc_reserved(sdp); 908 maxres = sdp->sd_log_blks_reserved + tr->tr_reserved; 909 gfs2_assert_withdraw(sdp, maxres >= reserved); 910 unused = maxres - reserved; 911 atomic_add(unused, &sdp->sd_log_blks_free); 912 trace_gfs2_log_blocks(sdp, unused); 913 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= 914 sdp->sd_jdesc->jd_blocks); 915 sdp->sd_log_blks_reserved = reserved; 916 917 gfs2_log_unlock(sdp); 918 } 919 920 /** 921 * gfs2_log_commit - Commit a transaction to the log 922 * @sdp: the filesystem 923 * @tr: the transaction 924 * 925 * We wake up gfs2_logd if the number of pinned blocks exceed thresh1 926 * or the total number of used blocks (pinned blocks plus AIL blocks) 927 * is greater than thresh2. 928 * 929 * At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of 930 * journal size. 931 * 932 * Returns: errno 933 */ 934 935 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 936 { 937 log_refund(sdp, tr); 938 939 if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) || 940 ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) > 941 atomic_read(&sdp->sd_log_thresh2))) 942 wake_up(&sdp->sd_logd_waitq); 943 } 944 945 /** 946 * gfs2_log_shutdown - write a shutdown header into a journal 947 * @sdp: the filesystem 948 * 949 */ 950 951 void gfs2_log_shutdown(struct gfs2_sbd *sdp) 952 { 953 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); 954 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 955 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); 956 957 sdp->sd_log_flush_head = sdp->sd_log_head; 958 959 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT | GFS2_LFC_SHUTDOWN); 960 961 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); 962 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); 963 964 sdp->sd_log_head = sdp->sd_log_flush_head; 965 sdp->sd_log_tail = sdp->sd_log_head; 966 } 967 968 static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp) 969 { 970 return (atomic_read(&sdp->sd_log_pinned) + 971 atomic_read(&sdp->sd_log_blks_needed) >= 972 atomic_read(&sdp->sd_log_thresh1)); 973 } 974 975 static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp) 976 { 977 unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free); 978 979 if (test_and_clear_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags)) 980 return 1; 981 982 return used_blocks + atomic_read(&sdp->sd_log_blks_needed) >= 983 atomic_read(&sdp->sd_log_thresh2); 984 } 985 986 /** 987 * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks 988 * @sdp: Pointer to GFS2 superblock 989 * 990 * Also, periodically check to make sure that we're using the most recent 991 * journal index. 992 */ 993 994 int gfs2_logd(void *data) 995 { 996 struct gfs2_sbd *sdp = data; 997 unsigned long t = 1; 998 DEFINE_WAIT(wait); 999 bool did_flush; 1000 1001 while (!kthread_should_stop()) { 1002 1003 /* Check for errors writing to the journal */ 1004 if (sdp->sd_log_error) { 1005 gfs2_lm_withdraw(sdp, 1006 "GFS2: fsid=%s: error %d: " 1007 "withdrawing the file system to " 1008 "prevent further damage.\n", 1009 sdp->sd_fsname, sdp->sd_log_error); 1010 } 1011 1012 did_flush = false; 1013 if (gfs2_jrnl_flush_reqd(sdp) || t == 0) { 1014 gfs2_ail1_empty(sdp); 1015 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 1016 GFS2_LFC_LOGD_JFLUSH_REQD); 1017 did_flush = true; 1018 } 1019 1020 if (gfs2_ail_flush_reqd(sdp)) { 1021 gfs2_ail1_start(sdp); 1022 gfs2_ail1_wait(sdp); 1023 gfs2_ail1_empty(sdp); 1024 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 1025 GFS2_LFC_LOGD_AIL_FLUSH_REQD); 1026 did_flush = true; 1027 } 1028 1029 if (!gfs2_ail_flush_reqd(sdp) || did_flush) 1030 wake_up(&sdp->sd_log_waitq); 1031 1032 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ; 1033 1034 try_to_freeze(); 1035 1036 do { 1037 prepare_to_wait(&sdp->sd_logd_waitq, &wait, 1038 TASK_INTERRUPTIBLE); 1039 if (!gfs2_ail_flush_reqd(sdp) && 1040 !gfs2_jrnl_flush_reqd(sdp) && 1041 !kthread_should_stop()) 1042 t = schedule_timeout(t); 1043 } while(t && !gfs2_ail_flush_reqd(sdp) && 1044 !gfs2_jrnl_flush_reqd(sdp) && 1045 !kthread_should_stop()); 1046 finish_wait(&sdp->sd_logd_waitq, &wait); 1047 } 1048 1049 return 0; 1050 } 1051 1052