1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 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/mempool.h> 13 #include <linux/gfs2_ondisk.h> 14 #include <linux/bio.h> 15 #include <linux/fs.h> 16 #include <linux/list_sort.h> 17 #include <linux/blkdev.h> 18 19 #include "bmap.h" 20 #include "dir.h" 21 #include "gfs2.h" 22 #include "incore.h" 23 #include "inode.h" 24 #include "glock.h" 25 #include "glops.h" 26 #include "log.h" 27 #include "lops.h" 28 #include "meta_io.h" 29 #include "recovery.h" 30 #include "rgrp.h" 31 #include "trans.h" 32 #include "util.h" 33 #include "trace_gfs2.h" 34 35 /** 36 * gfs2_pin - Pin a buffer in memory 37 * @sdp: The superblock 38 * @bh: The buffer to be pinned 39 * 40 * The log lock must be held when calling this function 41 */ 42 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) 43 { 44 struct gfs2_bufdata *bd; 45 46 BUG_ON(!current->journal_info); 47 48 clear_buffer_dirty(bh); 49 if (test_set_buffer_pinned(bh)) 50 gfs2_assert_withdraw(sdp, 0); 51 if (!buffer_uptodate(bh)) 52 gfs2_io_error_bh_wd(sdp, bh); 53 bd = bh->b_private; 54 /* If this buffer is in the AIL and it has already been written 55 * to in-place disk block, remove it from the AIL. 56 */ 57 spin_lock(&sdp->sd_ail_lock); 58 if (bd->bd_tr) 59 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list); 60 spin_unlock(&sdp->sd_ail_lock); 61 get_bh(bh); 62 atomic_inc(&sdp->sd_log_pinned); 63 trace_gfs2_pin(bd, 1); 64 } 65 66 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd) 67 { 68 return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP; 69 } 70 71 static void maybe_release_space(struct gfs2_bufdata *bd) 72 { 73 struct gfs2_glock *gl = bd->bd_gl; 74 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 75 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl); 76 unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number; 77 struct gfs2_bitmap *bi = rgd->rd_bits + index; 78 79 rgrp_lock_local(rgd); 80 if (bi->bi_clone == NULL) 81 goto out; 82 if (sdp->sd_args.ar_discard) 83 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL); 84 memcpy(bi->bi_clone + bi->bi_offset, 85 bd->bd_bh->b_data + bi->bi_offset, bi->bi_bytes); 86 clear_bit(GBF_FULL, &bi->bi_flags); 87 rgd->rd_free_clone = rgd->rd_free; 88 BUG_ON(rgd->rd_free_clone < rgd->rd_reserved); 89 rgd->rd_extfail_pt = rgd->rd_free; 90 91 out: 92 rgrp_unlock_local(rgd); 93 } 94 95 /** 96 * gfs2_unpin - Unpin a buffer 97 * @sdp: the filesystem the buffer belongs to 98 * @bh: The buffer to unpin 99 * @tr: The system transaction being flushed 100 */ 101 102 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, 103 struct gfs2_trans *tr) 104 { 105 struct gfs2_bufdata *bd = bh->b_private; 106 107 BUG_ON(!buffer_uptodate(bh)); 108 BUG_ON(!buffer_pinned(bh)); 109 110 lock_buffer(bh); 111 mark_buffer_dirty(bh); 112 clear_buffer_pinned(bh); 113 114 if (buffer_is_rgrp(bd)) 115 maybe_release_space(bd); 116 117 spin_lock(&sdp->sd_ail_lock); 118 if (bd->bd_tr) { 119 list_del(&bd->bd_ail_st_list); 120 brelse(bh); 121 } else { 122 struct gfs2_glock *gl = bd->bd_gl; 123 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list); 124 atomic_inc(&gl->gl_ail_count); 125 } 126 bd->bd_tr = tr; 127 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list); 128 spin_unlock(&sdp->sd_ail_lock); 129 130 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 131 trace_gfs2_pin(bd, 0); 132 unlock_buffer(bh); 133 atomic_dec(&sdp->sd_log_pinned); 134 } 135 136 void gfs2_log_incr_head(struct gfs2_sbd *sdp) 137 { 138 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) && 139 (sdp->sd_log_flush_head != sdp->sd_log_head)); 140 141 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) 142 sdp->sd_log_flush_head = 0; 143 } 144 145 u64 gfs2_log_bmap(struct gfs2_jdesc *jd, unsigned int lblock) 146 { 147 struct gfs2_journal_extent *je; 148 149 list_for_each_entry(je, &jd->extent_list, list) { 150 if (lblock >= je->lblock && lblock < je->lblock + je->blocks) 151 return je->dblock + lblock - je->lblock; 152 } 153 154 return -1; 155 } 156 157 /** 158 * gfs2_end_log_write_bh - end log write of pagecache data with buffers 159 * @sdp: The superblock 160 * @folio: The folio 161 * @offset: The first byte within the folio that completed 162 * @size: The number of bytes that completed 163 * @error: The i/o status 164 * 165 * This finds the relevant buffers and unlocks them and sets the 166 * error flag according to the status of the i/o request. This is 167 * used when the log is writing data which has an in-place version 168 * that is pinned in the pagecache. 169 */ 170 171 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct folio *folio, 172 size_t offset, size_t size, blk_status_t error) 173 { 174 struct buffer_head *bh, *next; 175 176 bh = folio_buffers(folio); 177 while (bh_offset(bh) < offset) 178 bh = bh->b_this_page; 179 do { 180 if (error) 181 mark_buffer_write_io_error(bh); 182 unlock_buffer(bh); 183 next = bh->b_this_page; 184 size -= bh->b_size; 185 brelse(bh); 186 bh = next; 187 } while (bh && size); 188 } 189 190 /** 191 * gfs2_end_log_write - end of i/o to the log 192 * @bio: The bio 193 * 194 * Each bio_vec contains either data from the pagecache or data 195 * relating to the log itself. Here we iterate over the bio_vec 196 * array, processing both kinds of data. 197 * 198 */ 199 200 static void gfs2_end_log_write(struct bio *bio) 201 { 202 struct gfs2_sbd *sdp = bio->bi_private; 203 struct bio_vec *bvec; 204 struct bvec_iter_all iter_all; 205 206 if (bio->bi_status) { 207 int err = blk_status_to_errno(bio->bi_status); 208 209 if (!cmpxchg(&sdp->sd_log_error, 0, err)) 210 fs_err(sdp, "Error %d writing to journal, jid=%u\n", 211 err, sdp->sd_jdesc->jd_jid); 212 gfs2_withdraw_delayed(sdp); 213 /* prevent more writes to the journal */ 214 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 215 wake_up(&sdp->sd_logd_waitq); 216 } 217 218 bio_for_each_segment_all(bvec, bio, iter_all) { 219 struct page *page = bvec->bv_page; 220 struct folio *folio = page_folio(page); 221 222 if (folio && folio_buffers(folio)) 223 gfs2_end_log_write_bh(sdp, folio, bvec->bv_offset, 224 bvec->bv_len, bio->bi_status); 225 else 226 mempool_free(page, gfs2_page_pool); 227 } 228 229 bio_put(bio); 230 if (atomic_dec_and_test(&sdp->sd_log_in_flight)) 231 wake_up(&sdp->sd_log_flush_wait); 232 } 233 234 /** 235 * gfs2_log_submit_bio - Submit any pending log bio 236 * @biop: Address of the bio pointer 237 * @opf: REQ_OP | op_flags 238 * 239 * Submit any pending part-built or full bio to the block device. If 240 * there is no pending bio, then this is a no-op. 241 */ 242 243 void gfs2_log_submit_bio(struct bio **biop, blk_opf_t opf) 244 { 245 struct bio *bio = *biop; 246 if (bio) { 247 struct gfs2_sbd *sdp = bio->bi_private; 248 atomic_inc(&sdp->sd_log_in_flight); 249 bio->bi_opf = opf; 250 submit_bio(bio); 251 *biop = NULL; 252 } 253 } 254 255 /** 256 * gfs2_log_alloc_bio - Allocate a bio 257 * @sdp: The super block 258 * @blkno: The device block number we want to write to 259 * @end_io: The bi_end_io callback 260 * 261 * Allocate a new bio, initialize it with the given parameters and return it. 262 * 263 * Returns: The newly allocated bio 264 */ 265 266 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno, 267 bio_end_io_t *end_io) 268 { 269 struct super_block *sb = sdp->sd_vfs; 270 struct bio *bio = bio_alloc(sb->s_bdev, BIO_MAX_VECS, 0, GFP_NOIO); 271 272 bio->bi_iter.bi_sector = blkno << sdp->sd_fsb2bb_shift; 273 bio->bi_end_io = end_io; 274 bio->bi_private = sdp; 275 276 return bio; 277 } 278 279 /** 280 * gfs2_log_get_bio - Get cached log bio, or allocate a new one 281 * @sdp: The super block 282 * @blkno: The device block number we want to write to 283 * @biop: The bio to get or allocate 284 * @op: REQ_OP 285 * @end_io: The bi_end_io callback 286 * @flush: Always flush the current bio and allocate a new one? 287 * 288 * If there is a cached bio, then if the next block number is sequential 289 * with the previous one, return it, otherwise flush the bio to the 290 * device. If there is no cached bio, or we just flushed it, then 291 * allocate a new one. 292 * 293 * Returns: The bio to use for log writes 294 */ 295 296 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno, 297 struct bio **biop, enum req_op op, 298 bio_end_io_t *end_io, bool flush) 299 { 300 struct bio *bio = *biop; 301 302 if (bio) { 303 u64 nblk; 304 305 nblk = bio_end_sector(bio); 306 nblk >>= sdp->sd_fsb2bb_shift; 307 if (blkno == nblk && !flush) 308 return bio; 309 gfs2_log_submit_bio(biop, op); 310 } 311 312 *biop = gfs2_log_alloc_bio(sdp, blkno, end_io); 313 return *biop; 314 } 315 316 /** 317 * gfs2_log_write - write to log 318 * @sdp: the filesystem 319 * @jd: The journal descriptor 320 * @page: the page to write 321 * @size: the size of the data to write 322 * @offset: the offset within the page 323 * @blkno: block number of the log entry 324 * 325 * Try and add the page segment to the current bio. If that fails, 326 * submit the current bio to the device and create a new one, and 327 * then add the page segment to that. 328 */ 329 330 void gfs2_log_write(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, 331 struct page *page, unsigned size, unsigned offset, 332 u64 blkno) 333 { 334 struct bio *bio; 335 int ret; 336 337 bio = gfs2_log_get_bio(sdp, blkno, &jd->jd_log_bio, REQ_OP_WRITE, 338 gfs2_end_log_write, false); 339 ret = bio_add_page(bio, page, size, offset); 340 if (ret == 0) { 341 bio = gfs2_log_get_bio(sdp, blkno, &jd->jd_log_bio, 342 REQ_OP_WRITE, gfs2_end_log_write, true); 343 ret = bio_add_page(bio, page, size, offset); 344 WARN_ON(ret == 0); 345 } 346 } 347 348 /** 349 * gfs2_log_write_bh - write a buffer's content to the log 350 * @sdp: The super block 351 * @bh: The buffer pointing to the in-place location 352 * 353 * This writes the content of the buffer to the next available location 354 * in the log. The buffer will be unlocked once the i/o to the log has 355 * completed. 356 */ 357 358 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh) 359 { 360 u64 dblock; 361 362 dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head); 363 gfs2_log_incr_head(sdp); 364 gfs2_log_write(sdp, sdp->sd_jdesc, folio_page(bh->b_folio, 0), 365 bh->b_size, bh_offset(bh), dblock); 366 } 367 368 /** 369 * gfs2_log_write_page - write one block stored in a page, into the log 370 * @sdp: The superblock 371 * @page: The struct page 372 * 373 * This writes the first block-sized part of the page into the log. Note 374 * that the page must have been allocated from the gfs2_page_pool mempool 375 * and that after this has been called, ownership has been transferred and 376 * the page may be freed at any time. 377 */ 378 379 static void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page) 380 { 381 struct super_block *sb = sdp->sd_vfs; 382 u64 dblock; 383 384 dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head); 385 gfs2_log_incr_head(sdp); 386 gfs2_log_write(sdp, sdp->sd_jdesc, page, sb->s_blocksize, 0, dblock); 387 } 388 389 /** 390 * gfs2_end_log_read - end I/O callback for reads from the log 391 * @bio: The bio 392 * 393 * Simply unlock the pages in the bio. The main thread will wait on them and 394 * process them in order as necessary. 395 */ 396 static void gfs2_end_log_read(struct bio *bio) 397 { 398 int error = blk_status_to_errno(bio->bi_status); 399 struct folio_iter fi; 400 401 bio_for_each_folio_all(fi, bio) { 402 /* We're abusing wb_err to get the error to gfs2_find_jhead */ 403 filemap_set_wb_err(fi.folio->mapping, error); 404 folio_end_read(fi.folio, !error); 405 } 406 407 bio_put(bio); 408 } 409 410 /** 411 * gfs2_jhead_folio_search - Look for the journal head in a given page. 412 * @jd: The journal descriptor 413 * @head: The journal head to start from 414 * @folio: The folio to look in 415 * 416 * Returns: 1 if found, 0 otherwise. 417 */ 418 static bool gfs2_jhead_folio_search(struct gfs2_jdesc *jd, 419 struct gfs2_log_header_host *head, 420 struct folio *folio) 421 { 422 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 423 struct gfs2_log_header_host lh; 424 void *kaddr; 425 unsigned int offset; 426 bool ret = false; 427 428 VM_BUG_ON_FOLIO(folio_test_large(folio), folio); 429 kaddr = kmap_local_folio(folio, 0); 430 for (offset = 0; offset < PAGE_SIZE; offset += sdp->sd_sb.sb_bsize) { 431 if (!__get_log_header(sdp, kaddr + offset, 0, &lh)) { 432 if (lh.lh_sequence >= head->lh_sequence) 433 *head = lh; 434 else { 435 ret = true; 436 break; 437 } 438 } 439 } 440 kunmap_local(kaddr); 441 return ret; 442 } 443 444 /** 445 * gfs2_jhead_process_page - Search/cleanup a page 446 * @jd: The journal descriptor 447 * @index: Index of the page to look into 448 * @head: The journal head to start from 449 * @done: If set, perform only cleanup, else search and set if found. 450 * 451 * Find the folio with 'index' in the journal's mapping. Search the folio for 452 * the journal head if requested (cleanup == false). Release refs on the 453 * folio so the page cache can reclaim it. We grabbed a 454 * reference on this folio twice, first when we did a filemap_grab_folio() 455 * to obtain the folio to add it to the bio and second when we do a 456 * filemap_get_folio() here to get the folio to wait on while I/O on it is being 457 * completed. 458 * This function is also used to free up a folio we might've grabbed but not 459 * used. Maybe we added it to a bio, but not submitted it for I/O. Or we 460 * submitted the I/O, but we already found the jhead so we only need to drop 461 * our references to the folio. 462 */ 463 464 static void gfs2_jhead_process_page(struct gfs2_jdesc *jd, unsigned long index, 465 struct gfs2_log_header_host *head, 466 bool *done) 467 { 468 struct folio *folio; 469 470 folio = filemap_get_folio(jd->jd_inode->i_mapping, index); 471 472 folio_wait_locked(folio); 473 if (!folio_test_uptodate(folio)) 474 *done = true; 475 476 if (!*done) 477 *done = gfs2_jhead_folio_search(jd, head, folio); 478 479 /* filemap_get_folio() and the earlier filemap_grab_folio() */ 480 folio_put_refs(folio, 2); 481 } 482 483 static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs) 484 { 485 struct bio *new; 486 487 new = bio_alloc(prev->bi_bdev, nr_iovecs, prev->bi_opf, GFP_NOIO); 488 bio_clone_blkg_association(new, prev); 489 new->bi_iter.bi_sector = bio_end_sector(prev); 490 bio_chain(new, prev); 491 submit_bio(prev); 492 return new; 493 } 494 495 /** 496 * gfs2_find_jhead - find the head of a log 497 * @jd: The journal descriptor 498 * @head: The log descriptor for the head of the log is returned here 499 * 500 * Do a search of a journal by reading it in large chunks using bios and find 501 * the valid log entry with the highest sequence number. (i.e. the log head) 502 * 503 * Returns: 0 on success, errno otherwise 504 */ 505 int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head) 506 { 507 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 508 struct address_space *mapping = jd->jd_inode->i_mapping; 509 unsigned int block = 0, blocks_submitted = 0, blocks_read = 0; 510 unsigned int bsize = sdp->sd_sb.sb_bsize, off; 511 unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift; 512 unsigned int shift = PAGE_SHIFT - bsize_shift; 513 unsigned int max_blocks = 2 * 1024 * 1024 >> bsize_shift; 514 struct gfs2_journal_extent *je; 515 int ret = 0; 516 struct bio *bio = NULL; 517 struct folio *folio = NULL; 518 bool done = false; 519 errseq_t since; 520 521 memset(head, 0, sizeof(*head)); 522 if (list_empty(&jd->extent_list)) 523 gfs2_map_journal_extents(sdp, jd); 524 525 since = filemap_sample_wb_err(mapping); 526 list_for_each_entry(je, &jd->extent_list, list) { 527 u64 dblock = je->dblock; 528 529 for (; block < je->lblock + je->blocks; block++, dblock++) { 530 if (!folio) { 531 folio = filemap_grab_folio(mapping, 532 block >> shift); 533 if (IS_ERR(folio)) { 534 ret = PTR_ERR(folio); 535 done = true; 536 goto out; 537 } 538 off = 0; 539 } 540 541 if (bio && (off || block < blocks_submitted + max_blocks)) { 542 sector_t sector = dblock << sdp->sd_fsb2bb_shift; 543 544 if (bio_end_sector(bio) == sector) { 545 if (bio_add_folio(bio, folio, bsize, off)) 546 goto block_added; 547 } 548 if (off) { 549 unsigned int blocks = 550 (PAGE_SIZE - off) >> bsize_shift; 551 552 bio = gfs2_chain_bio(bio, blocks); 553 goto add_block_to_new_bio; 554 } 555 } 556 557 if (bio) { 558 blocks_submitted = block; 559 submit_bio(bio); 560 } 561 562 bio = gfs2_log_alloc_bio(sdp, dblock, gfs2_end_log_read); 563 bio->bi_opf = REQ_OP_READ; 564 add_block_to_new_bio: 565 if (!bio_add_folio(bio, folio, bsize, off)) 566 BUG(); 567 block_added: 568 off += bsize; 569 if (off == folio_size(folio)) 570 folio = NULL; 571 if (blocks_submitted <= blocks_read + max_blocks) { 572 /* Keep at least one bio in flight */ 573 continue; 574 } 575 576 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); 577 blocks_read += PAGE_SIZE >> bsize_shift; 578 if (done) 579 goto out; /* found */ 580 } 581 } 582 583 out: 584 if (bio) 585 submit_bio(bio); 586 while (blocks_read < block) { 587 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); 588 blocks_read += PAGE_SIZE >> bsize_shift; 589 } 590 591 if (!ret) 592 ret = filemap_check_wb_err(mapping, since); 593 594 truncate_inode_pages(mapping, 0); 595 596 return ret; 597 } 598 599 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type, 600 u32 ld_length, u32 ld_data1) 601 { 602 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 603 struct gfs2_log_descriptor *ld = page_address(page); 604 clear_page(ld); 605 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 606 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD); 607 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD); 608 ld->ld_type = cpu_to_be32(ld_type); 609 ld->ld_length = cpu_to_be32(ld_length); 610 ld->ld_data1 = cpu_to_be32(ld_data1); 611 ld->ld_data2 = 0; 612 return page; 613 } 614 615 static void gfs2_check_magic(struct buffer_head *bh) 616 { 617 __be32 *ptr; 618 619 clear_buffer_escaped(bh); 620 ptr = kmap_local_folio(bh->b_folio, bh_offset(bh)); 621 if (*ptr == cpu_to_be32(GFS2_MAGIC)) 622 set_buffer_escaped(bh); 623 kunmap_local(ptr); 624 } 625 626 static int blocknr_cmp(void *priv, const struct list_head *a, 627 const struct list_head *b) 628 { 629 struct gfs2_bufdata *bda, *bdb; 630 631 bda = list_entry(a, struct gfs2_bufdata, bd_list); 632 bdb = list_entry(b, struct gfs2_bufdata, bd_list); 633 634 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr) 635 return -1; 636 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr) 637 return 1; 638 return 0; 639 } 640 641 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit, 642 unsigned int total, struct list_head *blist, 643 bool is_databuf) 644 { 645 struct gfs2_log_descriptor *ld; 646 struct gfs2_bufdata *bd1 = NULL, *bd2; 647 struct page *page; 648 unsigned int num; 649 unsigned n; 650 __be64 *ptr; 651 652 gfs2_log_lock(sdp); 653 list_sort(NULL, blist, blocknr_cmp); 654 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list); 655 while(total) { 656 num = total; 657 if (total > limit) 658 num = limit; 659 gfs2_log_unlock(sdp); 660 page = gfs2_get_log_desc(sdp, 661 is_databuf ? GFS2_LOG_DESC_JDATA : 662 GFS2_LOG_DESC_METADATA, num + 1, num); 663 ld = page_address(page); 664 gfs2_log_lock(sdp); 665 ptr = (__be64 *)(ld + 1); 666 667 n = 0; 668 list_for_each_entry_continue(bd1, blist, bd_list) { 669 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr); 670 if (is_databuf) { 671 gfs2_check_magic(bd1->bd_bh); 672 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0); 673 } 674 if (++n >= num) 675 break; 676 } 677 678 gfs2_log_unlock(sdp); 679 gfs2_log_write_page(sdp, page); 680 gfs2_log_lock(sdp); 681 682 n = 0; 683 list_for_each_entry_continue(bd2, blist, bd_list) { 684 get_bh(bd2->bd_bh); 685 gfs2_log_unlock(sdp); 686 lock_buffer(bd2->bd_bh); 687 688 if (buffer_escaped(bd2->bd_bh)) { 689 void *p; 690 691 page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 692 p = page_address(page); 693 memcpy_from_page(p, page, bh_offset(bd2->bd_bh), bd2->bd_bh->b_size); 694 *(__be32 *)p = 0; 695 clear_buffer_escaped(bd2->bd_bh); 696 unlock_buffer(bd2->bd_bh); 697 brelse(bd2->bd_bh); 698 gfs2_log_write_page(sdp, page); 699 } else { 700 gfs2_log_write_bh(sdp, bd2->bd_bh); 701 } 702 gfs2_log_lock(sdp); 703 if (++n >= num) 704 break; 705 } 706 707 BUG_ON(total < num); 708 total -= num; 709 } 710 gfs2_log_unlock(sdp); 711 } 712 713 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 714 { 715 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */ 716 unsigned int nbuf; 717 if (tr == NULL) 718 return; 719 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm; 720 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0); 721 } 722 723 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 724 { 725 struct list_head *head; 726 struct gfs2_bufdata *bd; 727 728 if (tr == NULL) 729 return; 730 731 head = &tr->tr_buf; 732 while (!list_empty(head)) { 733 bd = list_first_entry(head, struct gfs2_bufdata, bd_list); 734 list_del_init(&bd->bd_list); 735 gfs2_unpin(sdp, bd->bd_bh, tr); 736 } 737 } 738 739 static void buf_lo_before_scan(struct gfs2_jdesc *jd, 740 struct gfs2_log_header_host *head, int pass) 741 { 742 if (pass != 0) 743 return; 744 745 jd->jd_found_blocks = 0; 746 jd->jd_replayed_blocks = 0; 747 } 748 749 #define obsolete_rgrp_replay \ 750 "Replaying 0x%llx from jid=%d/0x%llx but we already have a bh!\n" 751 #define obsolete_rgrp_replay2 \ 752 "busy:%d, pinned:%d rg_gen:0x%llx, j_gen:0x%llx\n" 753 754 static void obsolete_rgrp(struct gfs2_jdesc *jd, struct buffer_head *bh_log, 755 u64 blkno) 756 { 757 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 758 struct gfs2_rgrpd *rgd; 759 struct gfs2_rgrp *jrgd = (struct gfs2_rgrp *)bh_log->b_data; 760 761 rgd = gfs2_blk2rgrpd(sdp, blkno, false); 762 if (rgd && rgd->rd_addr == blkno && 763 rgd->rd_bits && rgd->rd_bits->bi_bh) { 764 fs_info(sdp, obsolete_rgrp_replay, (unsigned long long)blkno, 765 jd->jd_jid, bh_log->b_blocknr); 766 fs_info(sdp, obsolete_rgrp_replay2, 767 buffer_busy(rgd->rd_bits->bi_bh) ? 1 : 0, 768 buffer_pinned(rgd->rd_bits->bi_bh), 769 rgd->rd_igeneration, 770 be64_to_cpu(jrgd->rg_igeneration)); 771 gfs2_dump_glock(NULL, rgd->rd_gl, true); 772 } 773 } 774 775 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 776 struct gfs2_log_descriptor *ld, __be64 *ptr, 777 int pass) 778 { 779 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 780 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 781 struct gfs2_glock *gl = ip->i_gl; 782 unsigned int blks = be32_to_cpu(ld->ld_data1); 783 struct buffer_head *bh_log, *bh_ip; 784 u64 blkno; 785 int error = 0; 786 787 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA) 788 return 0; 789 790 gfs2_replay_incr_blk(jd, &start); 791 792 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 793 blkno = be64_to_cpu(*ptr++); 794 795 jd->jd_found_blocks++; 796 797 if (gfs2_revoke_check(jd, blkno, start)) 798 continue; 799 800 error = gfs2_replay_read_block(jd, start, &bh_log); 801 if (error) 802 return error; 803 804 bh_ip = gfs2_meta_new(gl, blkno); 805 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size); 806 807 if (gfs2_meta_check(sdp, bh_ip)) 808 error = -EIO; 809 else { 810 struct gfs2_meta_header *mh = 811 (struct gfs2_meta_header *)bh_ip->b_data; 812 813 if (mh->mh_type == cpu_to_be32(GFS2_METATYPE_RG)) 814 obsolete_rgrp(jd, bh_log, blkno); 815 816 mark_buffer_dirty(bh_ip); 817 } 818 brelse(bh_log); 819 brelse(bh_ip); 820 821 if (error) 822 break; 823 824 jd->jd_replayed_blocks++; 825 } 826 827 return error; 828 } 829 830 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 831 { 832 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 833 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 834 835 if (error) { 836 gfs2_inode_metasync(ip->i_gl); 837 return; 838 } 839 if (pass != 1) 840 return; 841 842 gfs2_inode_metasync(ip->i_gl); 843 844 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n", 845 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks); 846 } 847 848 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 849 { 850 struct gfs2_meta_header *mh; 851 unsigned int offset; 852 struct list_head *head = &sdp->sd_log_revokes; 853 struct gfs2_bufdata *bd; 854 struct page *page; 855 unsigned int length; 856 857 gfs2_flush_revokes(sdp); 858 if (!sdp->sd_log_num_revoke) 859 return; 860 861 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke); 862 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke); 863 offset = sizeof(struct gfs2_log_descriptor); 864 865 list_for_each_entry(bd, head, bd_list) { 866 sdp->sd_log_num_revoke--; 867 868 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) { 869 gfs2_log_write_page(sdp, page); 870 page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 871 mh = page_address(page); 872 clear_page(mh); 873 mh->mh_magic = cpu_to_be32(GFS2_MAGIC); 874 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB); 875 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB); 876 offset = sizeof(struct gfs2_meta_header); 877 } 878 879 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno); 880 offset += sizeof(u64); 881 } 882 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 883 884 gfs2_log_write_page(sdp, page); 885 } 886 887 void gfs2_drain_revokes(struct gfs2_sbd *sdp) 888 { 889 struct list_head *head = &sdp->sd_log_revokes; 890 struct gfs2_bufdata *bd; 891 struct gfs2_glock *gl; 892 893 while (!list_empty(head)) { 894 bd = list_first_entry(head, struct gfs2_bufdata, bd_list); 895 list_del_init(&bd->bd_list); 896 gl = bd->bd_gl; 897 gfs2_glock_remove_revoke(gl); 898 kmem_cache_free(gfs2_bufdata_cachep, bd); 899 } 900 } 901 902 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 903 { 904 gfs2_drain_revokes(sdp); 905 } 906 907 static void revoke_lo_before_scan(struct gfs2_jdesc *jd, 908 struct gfs2_log_header_host *head, int pass) 909 { 910 if (pass != 0) 911 return; 912 913 jd->jd_found_revokes = 0; 914 jd->jd_replay_tail = head->lh_tail; 915 } 916 917 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 918 struct gfs2_log_descriptor *ld, __be64 *ptr, 919 int pass) 920 { 921 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 922 unsigned int blks = be32_to_cpu(ld->ld_length); 923 unsigned int revokes = be32_to_cpu(ld->ld_data1); 924 struct buffer_head *bh; 925 unsigned int offset; 926 u64 blkno; 927 int first = 1; 928 int error; 929 930 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE) 931 return 0; 932 933 offset = sizeof(struct gfs2_log_descriptor); 934 935 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 936 error = gfs2_replay_read_block(jd, start, &bh); 937 if (error) 938 return error; 939 940 if (!first) 941 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB); 942 943 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) { 944 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset)); 945 946 error = gfs2_revoke_add(jd, blkno, start); 947 if (error < 0) { 948 brelse(bh); 949 return error; 950 } 951 else if (error) 952 jd->jd_found_revokes++; 953 954 if (!--revokes) 955 break; 956 offset += sizeof(u64); 957 } 958 959 brelse(bh); 960 offset = sizeof(struct gfs2_meta_header); 961 first = 0; 962 } 963 964 return 0; 965 } 966 967 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 968 { 969 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 970 971 if (error) { 972 gfs2_revoke_clean(jd); 973 return; 974 } 975 if (pass != 1) 976 return; 977 978 fs_info(sdp, "jid=%u: Found %u revoke tags\n", 979 jd->jd_jid, jd->jd_found_revokes); 980 981 gfs2_revoke_clean(jd); 982 } 983 984 /** 985 * databuf_lo_before_commit - Scan the data buffers, writing as we go 986 * @sdp: The filesystem 987 * @tr: The system transaction being flushed 988 */ 989 990 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 991 { 992 unsigned int limit = databuf_limit(sdp); 993 unsigned int nbuf; 994 if (tr == NULL) 995 return; 996 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm; 997 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1); 998 } 999 1000 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 1001 struct gfs2_log_descriptor *ld, 1002 __be64 *ptr, int pass) 1003 { 1004 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 1005 struct gfs2_glock *gl = ip->i_gl; 1006 unsigned int blks = be32_to_cpu(ld->ld_data1); 1007 struct buffer_head *bh_log, *bh_ip; 1008 u64 blkno; 1009 u64 esc; 1010 int error = 0; 1011 1012 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA) 1013 return 0; 1014 1015 gfs2_replay_incr_blk(jd, &start); 1016 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 1017 blkno = be64_to_cpu(*ptr++); 1018 esc = be64_to_cpu(*ptr++); 1019 1020 jd->jd_found_blocks++; 1021 1022 if (gfs2_revoke_check(jd, blkno, start)) 1023 continue; 1024 1025 error = gfs2_replay_read_block(jd, start, &bh_log); 1026 if (error) 1027 return error; 1028 1029 bh_ip = gfs2_meta_new(gl, blkno); 1030 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size); 1031 1032 /* Unescape */ 1033 if (esc) { 1034 __be32 *eptr = (__be32 *)bh_ip->b_data; 1035 *eptr = cpu_to_be32(GFS2_MAGIC); 1036 } 1037 mark_buffer_dirty(bh_ip); 1038 1039 brelse(bh_log); 1040 brelse(bh_ip); 1041 1042 jd->jd_replayed_blocks++; 1043 } 1044 1045 return error; 1046 } 1047 1048 /* FIXME: sort out accounting for log blocks etc. */ 1049 1050 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 1051 { 1052 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 1053 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 1054 1055 if (error) { 1056 gfs2_inode_metasync(ip->i_gl); 1057 return; 1058 } 1059 if (pass != 1) 1060 return; 1061 1062 /* data sync? */ 1063 gfs2_inode_metasync(ip->i_gl); 1064 1065 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n", 1066 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks); 1067 } 1068 1069 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 1070 { 1071 struct list_head *head; 1072 struct gfs2_bufdata *bd; 1073 1074 if (tr == NULL) 1075 return; 1076 1077 head = &tr->tr_databuf; 1078 while (!list_empty(head)) { 1079 bd = list_first_entry(head, struct gfs2_bufdata, bd_list); 1080 list_del_init(&bd->bd_list); 1081 gfs2_unpin(sdp, bd->bd_bh, tr); 1082 } 1083 } 1084 1085 1086 static const struct gfs2_log_operations gfs2_buf_lops = { 1087 .lo_before_commit = buf_lo_before_commit, 1088 .lo_after_commit = buf_lo_after_commit, 1089 .lo_before_scan = buf_lo_before_scan, 1090 .lo_scan_elements = buf_lo_scan_elements, 1091 .lo_after_scan = buf_lo_after_scan, 1092 .lo_name = "buf", 1093 }; 1094 1095 static const struct gfs2_log_operations gfs2_revoke_lops = { 1096 .lo_before_commit = revoke_lo_before_commit, 1097 .lo_after_commit = revoke_lo_after_commit, 1098 .lo_before_scan = revoke_lo_before_scan, 1099 .lo_scan_elements = revoke_lo_scan_elements, 1100 .lo_after_scan = revoke_lo_after_scan, 1101 .lo_name = "revoke", 1102 }; 1103 1104 static const struct gfs2_log_operations gfs2_databuf_lops = { 1105 .lo_before_commit = databuf_lo_before_commit, 1106 .lo_after_commit = databuf_lo_after_commit, 1107 .lo_scan_elements = databuf_lo_scan_elements, 1108 .lo_after_scan = databuf_lo_after_scan, 1109 .lo_name = "databuf", 1110 }; 1111 1112 const struct gfs2_log_operations *gfs2_log_ops[] = { 1113 &gfs2_databuf_lops, 1114 &gfs2_buf_lops, 1115 &gfs2_revoke_lops, 1116 NULL, 1117 }; 1118 1119