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 "log.h" 26 #include "lops.h" 27 #include "meta_io.h" 28 #include "recovery.h" 29 #include "rgrp.h" 30 #include "trans.h" 31 #include "util.h" 32 #include "trace_gfs2.h" 33 34 /** 35 * gfs2_pin - Pin a buffer in memory 36 * @sdp: The superblock 37 * @bh: The buffer to be pinned 38 * 39 * The log lock must be held when calling this function 40 */ 41 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) 42 { 43 struct gfs2_bufdata *bd; 44 45 BUG_ON(!current->journal_info); 46 47 clear_buffer_dirty(bh); 48 if (test_set_buffer_pinned(bh)) 49 gfs2_assert_withdraw(sdp, 0); 50 if (!buffer_uptodate(bh)) 51 gfs2_io_error_bh_wd(sdp, bh); 52 bd = bh->b_private; 53 /* If this buffer is in the AIL and it has already been written 54 * to in-place disk block, remove it from the AIL. 55 */ 56 spin_lock(&sdp->sd_ail_lock); 57 if (bd->bd_tr) 58 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list); 59 spin_unlock(&sdp->sd_ail_lock); 60 get_bh(bh); 61 atomic_inc(&sdp->sd_log_pinned); 62 trace_gfs2_pin(bd, 1); 63 } 64 65 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd) 66 { 67 return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP; 68 } 69 70 static void maybe_release_space(struct gfs2_bufdata *bd) 71 { 72 struct gfs2_glock *gl = bd->bd_gl; 73 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 74 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl); 75 unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number; 76 struct gfs2_bitmap *bi = rgd->rd_bits + index; 77 78 if (bi->bi_clone == NULL) 79 return; 80 if (sdp->sd_args.ar_discard) 81 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL); 82 memcpy(bi->bi_clone + bi->bi_offset, 83 bd->bd_bh->b_data + bi->bi_offset, bi->bi_bytes); 84 clear_bit(GBF_FULL, &bi->bi_flags); 85 rgd->rd_free_clone = rgd->rd_free; 86 rgd->rd_extfail_pt = rgd->rd_free; 87 } 88 89 /** 90 * gfs2_unpin - Unpin a buffer 91 * @sdp: the filesystem the buffer belongs to 92 * @bh: The buffer to unpin 93 * @ai: 94 * @flags: The inode dirty flags 95 * 96 */ 97 98 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, 99 struct gfs2_trans *tr) 100 { 101 struct gfs2_bufdata *bd = bh->b_private; 102 103 BUG_ON(!buffer_uptodate(bh)); 104 BUG_ON(!buffer_pinned(bh)); 105 106 lock_buffer(bh); 107 mark_buffer_dirty(bh); 108 clear_buffer_pinned(bh); 109 110 if (buffer_is_rgrp(bd)) 111 maybe_release_space(bd); 112 113 spin_lock(&sdp->sd_ail_lock); 114 if (bd->bd_tr) { 115 list_del(&bd->bd_ail_st_list); 116 brelse(bh); 117 } else { 118 struct gfs2_glock *gl = bd->bd_gl; 119 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list); 120 atomic_inc(&gl->gl_ail_count); 121 } 122 bd->bd_tr = tr; 123 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list); 124 spin_unlock(&sdp->sd_ail_lock); 125 126 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 127 trace_gfs2_pin(bd, 0); 128 unlock_buffer(bh); 129 atomic_dec(&sdp->sd_log_pinned); 130 } 131 132 void gfs2_log_incr_head(struct gfs2_sbd *sdp) 133 { 134 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) && 135 (sdp->sd_log_flush_head != sdp->sd_log_head)); 136 137 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) 138 sdp->sd_log_flush_head = 0; 139 } 140 141 u64 gfs2_log_bmap(struct gfs2_jdesc *jd, unsigned int lblock) 142 { 143 struct gfs2_journal_extent *je; 144 145 list_for_each_entry(je, &jd->extent_list, list) { 146 if (lblock >= je->lblock && lblock < je->lblock + je->blocks) 147 return je->dblock + lblock - je->lblock; 148 } 149 150 return -1; 151 } 152 153 /** 154 * gfs2_end_log_write_bh - end log write of pagecache data with buffers 155 * @sdp: The superblock 156 * @bvec: The bio_vec 157 * @error: The i/o status 158 * 159 * This finds the relevant buffers and unlocks them and sets the 160 * error flag according to the status of the i/o request. This is 161 * used when the log is writing data which has an in-place version 162 * that is pinned in the pagecache. 163 */ 164 165 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, 166 struct bio_vec *bvec, 167 blk_status_t error) 168 { 169 struct buffer_head *bh, *next; 170 struct page *page = bvec->bv_page; 171 unsigned size; 172 173 bh = page_buffers(page); 174 size = bvec->bv_len; 175 while (bh_offset(bh) < bvec->bv_offset) 176 bh = bh->b_this_page; 177 do { 178 if (error) 179 mark_buffer_write_io_error(bh); 180 unlock_buffer(bh); 181 next = bh->b_this_page; 182 size -= bh->b_size; 183 brelse(bh); 184 bh = next; 185 } while(bh && size); 186 } 187 188 /** 189 * gfs2_end_log_write - end of i/o to the log 190 * @bio: The bio 191 * 192 * Each bio_vec contains either data from the pagecache or data 193 * relating to the log itself. Here we iterate over the bio_vec 194 * array, processing both kinds of data. 195 * 196 */ 197 198 static void gfs2_end_log_write(struct bio *bio) 199 { 200 struct gfs2_sbd *sdp = bio->bi_private; 201 struct bio_vec *bvec; 202 struct page *page; 203 struct bvec_iter_all iter_all; 204 205 if (bio->bi_status) { 206 if (!cmpxchg(&sdp->sd_log_error, 0, (int)bio->bi_status)) 207 fs_err(sdp, "Error %d writing to journal, jid=%u\n", 208 bio->bi_status, sdp->sd_jdesc->jd_jid); 209 gfs2_withdraw_delayed(sdp); 210 /* prevent more writes to the journal */ 211 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 212 wake_up(&sdp->sd_logd_waitq); 213 } 214 215 bio_for_each_segment_all(bvec, bio, iter_all) { 216 page = bvec->bv_page; 217 if (page_has_buffers(page)) 218 gfs2_end_log_write_bh(sdp, bvec, bio->bi_status); 219 else 220 mempool_free(page, gfs2_page_pool); 221 } 222 223 bio_put(bio); 224 if (atomic_dec_and_test(&sdp->sd_log_in_flight)) 225 wake_up(&sdp->sd_log_flush_wait); 226 } 227 228 /** 229 * gfs2_log_submit_bio - Submit any pending log bio 230 * @biop: Address of the bio pointer 231 * @opf: REQ_OP | op_flags 232 * 233 * Submit any pending part-built or full bio to the block device. If 234 * there is no pending bio, then this is a no-op. 235 */ 236 237 void gfs2_log_submit_bio(struct bio **biop, int opf) 238 { 239 struct bio *bio = *biop; 240 if (bio) { 241 struct gfs2_sbd *sdp = bio->bi_private; 242 atomic_inc(&sdp->sd_log_in_flight); 243 bio->bi_opf = opf; 244 submit_bio(bio); 245 *biop = NULL; 246 } 247 } 248 249 /** 250 * gfs2_log_alloc_bio - Allocate a bio 251 * @sdp: The super block 252 * @blkno: The device block number we want to write to 253 * @end_io: The bi_end_io callback 254 * 255 * Allocate a new bio, initialize it with the given parameters and return it. 256 * 257 * Returns: The newly allocated bio 258 */ 259 260 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno, 261 bio_end_io_t *end_io) 262 { 263 struct super_block *sb = sdp->sd_vfs; 264 struct bio *bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); 265 266 bio->bi_iter.bi_sector = blkno << sdp->sd_fsb2bb_shift; 267 bio_set_dev(bio, sb->s_bdev); 268 bio->bi_end_io = end_io; 269 bio->bi_private = sdp; 270 271 return bio; 272 } 273 274 /** 275 * gfs2_log_get_bio - Get cached log bio, or allocate a new one 276 * @sdp: The super block 277 * @blkno: The device block number we want to write to 278 * @bio: The bio to get or allocate 279 * @op: REQ_OP 280 * @end_io: The bi_end_io callback 281 * @flush: Always flush the current bio and allocate a new one? 282 * 283 * If there is a cached bio, then if the next block number is sequential 284 * with the previous one, return it, otherwise flush the bio to the 285 * device. If there is no cached bio, or we just flushed it, then 286 * allocate a new one. 287 * 288 * Returns: The bio to use for log writes 289 */ 290 291 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno, 292 struct bio **biop, int op, 293 bio_end_io_t *end_io, bool flush) 294 { 295 struct bio *bio = *biop; 296 297 if (bio) { 298 u64 nblk; 299 300 nblk = bio_end_sector(bio); 301 nblk >>= sdp->sd_fsb2bb_shift; 302 if (blkno == nblk && !flush) 303 return bio; 304 gfs2_log_submit_bio(biop, op); 305 } 306 307 *biop = gfs2_log_alloc_bio(sdp, blkno, end_io); 308 return *biop; 309 } 310 311 /** 312 * gfs2_log_write - write to log 313 * @sdp: the filesystem 314 * @page: the page to write 315 * @size: the size of the data to write 316 * @offset: the offset within the page 317 * @blkno: block number of the log entry 318 * 319 * Try and add the page segment to the current bio. If that fails, 320 * submit the current bio to the device and create a new one, and 321 * then add the page segment to that. 322 */ 323 324 void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page, 325 unsigned size, unsigned offset, u64 blkno) 326 { 327 struct bio *bio; 328 int ret; 329 330 bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio, REQ_OP_WRITE, 331 gfs2_end_log_write, false); 332 ret = bio_add_page(bio, page, size, offset); 333 if (ret == 0) { 334 bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio, 335 REQ_OP_WRITE, gfs2_end_log_write, true); 336 ret = bio_add_page(bio, page, size, offset); 337 WARN_ON(ret == 0); 338 } 339 } 340 341 /** 342 * gfs2_log_write_bh - write a buffer's content to the log 343 * @sdp: The super block 344 * @bh: The buffer pointing to the in-place location 345 * 346 * This writes the content of the buffer to the next available location 347 * in the log. The buffer will be unlocked once the i/o to the log has 348 * completed. 349 */ 350 351 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh) 352 { 353 u64 dblock; 354 355 dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head); 356 gfs2_log_incr_head(sdp); 357 gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh), dblock); 358 } 359 360 /** 361 * gfs2_log_write_page - write one block stored in a page, into the log 362 * @sdp: The superblock 363 * @page: The struct page 364 * 365 * This writes the first block-sized part of the page into the log. Note 366 * that the page must have been allocated from the gfs2_page_pool mempool 367 * and that after this has been called, ownership has been transferred and 368 * the page may be freed at any time. 369 */ 370 371 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page) 372 { 373 struct super_block *sb = sdp->sd_vfs; 374 u64 dblock; 375 376 dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head); 377 gfs2_log_incr_head(sdp); 378 gfs2_log_write(sdp, page, sb->s_blocksize, 0, dblock); 379 } 380 381 /** 382 * gfs2_end_log_read - end I/O callback for reads from the log 383 * @bio: The bio 384 * 385 * Simply unlock the pages in the bio. The main thread will wait on them and 386 * process them in order as necessary. 387 */ 388 389 static void gfs2_end_log_read(struct bio *bio) 390 { 391 struct page *page; 392 struct bio_vec *bvec; 393 struct bvec_iter_all iter_all; 394 395 bio_for_each_segment_all(bvec, bio, iter_all) { 396 page = bvec->bv_page; 397 if (bio->bi_status) { 398 int err = blk_status_to_errno(bio->bi_status); 399 400 SetPageError(page); 401 mapping_set_error(page->mapping, err); 402 } 403 unlock_page(page); 404 } 405 406 bio_put(bio); 407 } 408 409 /** 410 * gfs2_jhead_pg_srch - Look for the journal head in a given page. 411 * @jd: The journal descriptor 412 * @page: The page to look in 413 * 414 * Returns: 1 if found, 0 otherwise. 415 */ 416 417 static bool gfs2_jhead_pg_srch(struct gfs2_jdesc *jd, 418 struct gfs2_log_header_host *head, 419 struct page *page) 420 { 421 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 422 struct gfs2_log_header_host uninitialized_var(lh); 423 void *kaddr = kmap_atomic(page); 424 unsigned int offset; 425 bool ret = false; 426 427 for (offset = 0; offset < PAGE_SIZE; offset += sdp->sd_sb.sb_bsize) { 428 if (!__get_log_header(sdp, kaddr + offset, 0, &lh)) { 429 if (lh.lh_sequence >= head->lh_sequence) 430 *head = lh; 431 else { 432 ret = true; 433 break; 434 } 435 } 436 } 437 kunmap_atomic(kaddr); 438 return ret; 439 } 440 441 /** 442 * gfs2_jhead_process_page - Search/cleanup a page 443 * @jd: The journal descriptor 444 * @index: Index of the page to look into 445 * @done: If set, perform only cleanup, else search and set if found. 446 * 447 * Find the page with 'index' in the journal's mapping. Search the page for 448 * the journal head if requested (cleanup == false). Release refs on the 449 * page so the page cache can reclaim it (put_page() twice). We grabbed a 450 * reference on this page two times, first when we did a find_or_create_page() 451 * to obtain the page to add it to the bio and second when we do a 452 * find_get_page() here to get the page to wait on while I/O on it is being 453 * completed. 454 * This function is also used to free up a page we might've grabbed but not 455 * used. Maybe we added it to a bio, but not submitted it for I/O. Or we 456 * submitted the I/O, but we already found the jhead so we only need to drop 457 * our references to the page. 458 */ 459 460 static void gfs2_jhead_process_page(struct gfs2_jdesc *jd, unsigned long index, 461 struct gfs2_log_header_host *head, 462 bool *done) 463 { 464 struct page *page; 465 466 page = find_get_page(jd->jd_inode->i_mapping, index); 467 wait_on_page_locked(page); 468 469 if (PageError(page)) 470 *done = true; 471 472 if (!*done) 473 *done = gfs2_jhead_pg_srch(jd, head, page); 474 475 put_page(page); /* Once for find_get_page */ 476 put_page(page); /* Once more for find_or_create_page */ 477 } 478 479 static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs) 480 { 481 struct bio *new; 482 483 new = bio_alloc(GFP_NOIO, nr_iovecs); 484 bio_copy_dev(new, prev); 485 new->bi_iter.bi_sector = bio_end_sector(prev); 486 new->bi_opf = prev->bi_opf; 487 new->bi_write_hint = prev->bi_write_hint; 488 bio_chain(new, prev); 489 submit_bio(prev); 490 return new; 491 } 492 493 /** 494 * gfs2_find_jhead - find the head of a log 495 * @jd: The journal descriptor 496 * @head: The log descriptor for the head of the log is returned here 497 * 498 * Do a search of a journal by reading it in large chunks using bios and find 499 * the valid log entry with the highest sequence number. (i.e. the log head) 500 * 501 * Returns: 0 on success, errno otherwise 502 */ 503 int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head, 504 bool keep_cache) 505 { 506 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 507 struct address_space *mapping = jd->jd_inode->i_mapping; 508 unsigned int block = 0, blocks_submitted = 0, blocks_read = 0; 509 unsigned int bsize = sdp->sd_sb.sb_bsize, off; 510 unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift; 511 unsigned int shift = PAGE_SHIFT - bsize_shift; 512 unsigned int max_bio_size = 2 * 1024 * 1024; 513 struct gfs2_journal_extent *je; 514 int sz, ret = 0; 515 struct bio *bio = NULL; 516 struct page *page = NULL; 517 bool bio_chained = false, done = false; 518 errseq_t since; 519 520 memset(head, 0, sizeof(*head)); 521 if (list_empty(&jd->extent_list)) 522 gfs2_map_journal_extents(sdp, jd); 523 524 since = filemap_sample_wb_err(mapping); 525 list_for_each_entry(je, &jd->extent_list, list) { 526 u64 dblock = je->dblock; 527 528 for (; block < je->lblock + je->blocks; block++, dblock++) { 529 if (!page) { 530 page = find_or_create_page(mapping, 531 block >> shift, GFP_NOFS); 532 if (!page) { 533 ret = -ENOMEM; 534 done = true; 535 goto out; 536 } 537 off = 0; 538 } 539 540 if (!bio || (bio_chained && !off) || 541 bio->bi_iter.bi_size >= max_bio_size) { 542 /* start new bio */ 543 } else { 544 sector_t sector = dblock << sdp->sd_fsb2bb_shift; 545 546 if (bio_end_sector(bio) == sector) { 547 sz = bio_add_page(bio, page, bsize, off); 548 if (sz == bsize) 549 goto block_added; 550 } 551 if (off) { 552 unsigned int blocks = 553 (PAGE_SIZE - off) >> bsize_shift; 554 555 bio = gfs2_chain_bio(bio, blocks); 556 bio_chained = true; 557 goto add_block_to_new_bio; 558 } 559 } 560 561 if (bio) { 562 blocks_submitted = block + 1; 563 submit_bio(bio); 564 } 565 566 bio = gfs2_log_alloc_bio(sdp, dblock, gfs2_end_log_read); 567 bio->bi_opf = REQ_OP_READ; 568 bio_chained = false; 569 add_block_to_new_bio: 570 sz = bio_add_page(bio, page, bsize, off); 571 BUG_ON(sz != bsize); 572 block_added: 573 off += bsize; 574 if (off == PAGE_SIZE) 575 page = NULL; 576 if (blocks_submitted < 2 * max_bio_size >> bsize_shift) { 577 /* Keep at least one bio in flight */ 578 continue; 579 } 580 581 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); 582 blocks_read += PAGE_SIZE >> bsize_shift; 583 if (done) 584 goto out; /* found */ 585 } 586 } 587 588 out: 589 if (bio) 590 submit_bio(bio); 591 while (blocks_read < block) { 592 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); 593 blocks_read += PAGE_SIZE >> bsize_shift; 594 } 595 596 if (!ret) 597 ret = filemap_check_wb_err(mapping, since); 598 599 if (!keep_cache) 600 truncate_inode_pages(mapping, 0); 601 602 return ret; 603 } 604 605 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type, 606 u32 ld_length, u32 ld_data1) 607 { 608 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 609 struct gfs2_log_descriptor *ld = page_address(page); 610 clear_page(ld); 611 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 612 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD); 613 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD); 614 ld->ld_type = cpu_to_be32(ld_type); 615 ld->ld_length = cpu_to_be32(ld_length); 616 ld->ld_data1 = cpu_to_be32(ld_data1); 617 ld->ld_data2 = 0; 618 return page; 619 } 620 621 static void gfs2_check_magic(struct buffer_head *bh) 622 { 623 void *kaddr; 624 __be32 *ptr; 625 626 clear_buffer_escaped(bh); 627 kaddr = kmap_atomic(bh->b_page); 628 ptr = kaddr + bh_offset(bh); 629 if (*ptr == cpu_to_be32(GFS2_MAGIC)) 630 set_buffer_escaped(bh); 631 kunmap_atomic(kaddr); 632 } 633 634 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b) 635 { 636 struct gfs2_bufdata *bda, *bdb; 637 638 bda = list_entry(a, struct gfs2_bufdata, bd_list); 639 bdb = list_entry(b, struct gfs2_bufdata, bd_list); 640 641 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr) 642 return -1; 643 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr) 644 return 1; 645 return 0; 646 } 647 648 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit, 649 unsigned int total, struct list_head *blist, 650 bool is_databuf) 651 { 652 struct gfs2_log_descriptor *ld; 653 struct gfs2_bufdata *bd1 = NULL, *bd2; 654 struct page *page; 655 unsigned int num; 656 unsigned n; 657 __be64 *ptr; 658 659 gfs2_log_lock(sdp); 660 list_sort(NULL, blist, blocknr_cmp); 661 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list); 662 while(total) { 663 num = total; 664 if (total > limit) 665 num = limit; 666 gfs2_log_unlock(sdp); 667 page = gfs2_get_log_desc(sdp, 668 is_databuf ? GFS2_LOG_DESC_JDATA : 669 GFS2_LOG_DESC_METADATA, num + 1, num); 670 ld = page_address(page); 671 gfs2_log_lock(sdp); 672 ptr = (__be64 *)(ld + 1); 673 674 n = 0; 675 list_for_each_entry_continue(bd1, blist, bd_list) { 676 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr); 677 if (is_databuf) { 678 gfs2_check_magic(bd1->bd_bh); 679 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0); 680 } 681 if (++n >= num) 682 break; 683 } 684 685 gfs2_log_unlock(sdp); 686 gfs2_log_write_page(sdp, page); 687 gfs2_log_lock(sdp); 688 689 n = 0; 690 list_for_each_entry_continue(bd2, blist, bd_list) { 691 get_bh(bd2->bd_bh); 692 gfs2_log_unlock(sdp); 693 lock_buffer(bd2->bd_bh); 694 695 if (buffer_escaped(bd2->bd_bh)) { 696 void *kaddr; 697 page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 698 ptr = page_address(page); 699 kaddr = kmap_atomic(bd2->bd_bh->b_page); 700 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh), 701 bd2->bd_bh->b_size); 702 kunmap_atomic(kaddr); 703 *(__be32 *)ptr = 0; 704 clear_buffer_escaped(bd2->bd_bh); 705 unlock_buffer(bd2->bd_bh); 706 brelse(bd2->bd_bh); 707 gfs2_log_write_page(sdp, page); 708 } else { 709 gfs2_log_write_bh(sdp, bd2->bd_bh); 710 } 711 gfs2_log_lock(sdp); 712 if (++n >= num) 713 break; 714 } 715 716 BUG_ON(total < num); 717 total -= num; 718 } 719 gfs2_log_unlock(sdp); 720 } 721 722 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 723 { 724 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */ 725 unsigned int nbuf; 726 if (tr == NULL) 727 return; 728 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm; 729 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0); 730 } 731 732 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 733 { 734 struct list_head *head; 735 struct gfs2_bufdata *bd; 736 737 if (tr == NULL) 738 return; 739 740 head = &tr->tr_buf; 741 while (!list_empty(head)) { 742 bd = list_first_entry(head, struct gfs2_bufdata, bd_list); 743 list_del_init(&bd->bd_list); 744 gfs2_unpin(sdp, bd->bd_bh, tr); 745 } 746 } 747 748 static void buf_lo_before_scan(struct gfs2_jdesc *jd, 749 struct gfs2_log_header_host *head, int pass) 750 { 751 if (pass != 0) 752 return; 753 754 jd->jd_found_blocks = 0; 755 jd->jd_replayed_blocks = 0; 756 } 757 758 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 759 struct gfs2_log_descriptor *ld, __be64 *ptr, 760 int pass) 761 { 762 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 763 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 764 struct gfs2_glock *gl = ip->i_gl; 765 unsigned int blks = be32_to_cpu(ld->ld_data1); 766 struct buffer_head *bh_log, *bh_ip; 767 u64 blkno; 768 int error = 0; 769 770 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA) 771 return 0; 772 773 gfs2_replay_incr_blk(jd, &start); 774 775 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 776 blkno = be64_to_cpu(*ptr++); 777 778 jd->jd_found_blocks++; 779 780 if (gfs2_revoke_check(jd, blkno, start)) 781 continue; 782 783 error = gfs2_replay_read_block(jd, start, &bh_log); 784 if (error) 785 return error; 786 787 bh_ip = gfs2_meta_new(gl, blkno); 788 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size); 789 790 if (gfs2_meta_check(sdp, bh_ip)) 791 error = -EIO; 792 else { 793 struct gfs2_meta_header *mh = 794 (struct gfs2_meta_header *)bh_ip->b_data; 795 796 if (mh->mh_type == cpu_to_be32(GFS2_METATYPE_RG)) { 797 struct gfs2_rgrpd *rgd; 798 799 rgd = gfs2_blk2rgrpd(sdp, blkno, false); 800 if (rgd && rgd->rd_addr == blkno && 801 rgd->rd_bits && rgd->rd_bits->bi_bh) { 802 fs_info(sdp, "Replaying 0x%llx but we " 803 "already have a bh!\n", 804 (unsigned long long)blkno); 805 fs_info(sdp, "busy:%d, pinned:%d\n", 806 buffer_busy(rgd->rd_bits->bi_bh) ? 1 : 0, 807 buffer_pinned(rgd->rd_bits->bi_bh)); 808 gfs2_dump_glock(NULL, rgd->rd_gl, true); 809 } 810 } 811 mark_buffer_dirty(bh_ip); 812 } 813 brelse(bh_log); 814 brelse(bh_ip); 815 816 if (error) 817 break; 818 819 jd->jd_replayed_blocks++; 820 } 821 822 return error; 823 } 824 825 /** 826 * gfs2_meta_sync - Sync all buffers associated with a glock 827 * @gl: The glock 828 * 829 */ 830 831 static void gfs2_meta_sync(struct gfs2_glock *gl) 832 { 833 struct address_space *mapping = gfs2_glock2aspace(gl); 834 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 835 int error; 836 837 if (mapping == NULL) 838 mapping = &sdp->sd_aspace; 839 840 filemap_fdatawrite(mapping); 841 error = filemap_fdatawait(mapping); 842 843 if (error) 844 gfs2_io_error(gl->gl_name.ln_sbd); 845 } 846 847 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 848 { 849 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 850 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 851 852 if (error) { 853 gfs2_meta_sync(ip->i_gl); 854 return; 855 } 856 if (pass != 1) 857 return; 858 859 gfs2_meta_sync(ip->i_gl); 860 861 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n", 862 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks); 863 } 864 865 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 866 { 867 struct gfs2_meta_header *mh; 868 unsigned int offset; 869 struct list_head *head = &sdp->sd_log_revokes; 870 struct gfs2_bufdata *bd; 871 struct page *page; 872 unsigned int length; 873 874 gfs2_write_revokes(sdp); 875 if (!sdp->sd_log_num_revoke) 876 return; 877 878 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke); 879 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke); 880 offset = sizeof(struct gfs2_log_descriptor); 881 882 list_for_each_entry(bd, head, bd_list) { 883 sdp->sd_log_num_revoke--; 884 885 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) { 886 887 gfs2_log_write_page(sdp, page); 888 page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 889 mh = page_address(page); 890 clear_page(mh); 891 mh->mh_magic = cpu_to_be32(GFS2_MAGIC); 892 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB); 893 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB); 894 offset = sizeof(struct gfs2_meta_header); 895 } 896 897 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno); 898 offset += sizeof(u64); 899 } 900 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 901 902 gfs2_log_write_page(sdp, page); 903 } 904 905 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 906 { 907 struct list_head *head = &sdp->sd_log_revokes; 908 struct gfs2_bufdata *bd; 909 struct gfs2_glock *gl; 910 911 while (!list_empty(head)) { 912 bd = list_first_entry(head, struct gfs2_bufdata, bd_list); 913 list_del_init(&bd->bd_list); 914 gl = bd->bd_gl; 915 gfs2_glock_remove_revoke(gl); 916 kmem_cache_free(gfs2_bufdata_cachep, bd); 917 } 918 } 919 920 static void revoke_lo_before_scan(struct gfs2_jdesc *jd, 921 struct gfs2_log_header_host *head, int pass) 922 { 923 if (pass != 0) 924 return; 925 926 jd->jd_found_revokes = 0; 927 jd->jd_replay_tail = head->lh_tail; 928 } 929 930 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 931 struct gfs2_log_descriptor *ld, __be64 *ptr, 932 int pass) 933 { 934 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 935 unsigned int blks = be32_to_cpu(ld->ld_length); 936 unsigned int revokes = be32_to_cpu(ld->ld_data1); 937 struct buffer_head *bh; 938 unsigned int offset; 939 u64 blkno; 940 int first = 1; 941 int error; 942 943 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE) 944 return 0; 945 946 offset = sizeof(struct gfs2_log_descriptor); 947 948 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 949 error = gfs2_replay_read_block(jd, start, &bh); 950 if (error) 951 return error; 952 953 if (!first) 954 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB); 955 956 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) { 957 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset)); 958 959 error = gfs2_revoke_add(jd, blkno, start); 960 if (error < 0) { 961 brelse(bh); 962 return error; 963 } 964 else if (error) 965 jd->jd_found_revokes++; 966 967 if (!--revokes) 968 break; 969 offset += sizeof(u64); 970 } 971 972 brelse(bh); 973 offset = sizeof(struct gfs2_meta_header); 974 first = 0; 975 } 976 977 return 0; 978 } 979 980 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 981 { 982 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 983 984 if (error) { 985 gfs2_revoke_clean(jd); 986 return; 987 } 988 if (pass != 1) 989 return; 990 991 fs_info(sdp, "jid=%u: Found %u revoke tags\n", 992 jd->jd_jid, jd->jd_found_revokes); 993 994 gfs2_revoke_clean(jd); 995 } 996 997 /** 998 * databuf_lo_before_commit - Scan the data buffers, writing as we go 999 * 1000 */ 1001 1002 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 1003 { 1004 unsigned int limit = databuf_limit(sdp); 1005 unsigned int nbuf; 1006 if (tr == NULL) 1007 return; 1008 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm; 1009 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1); 1010 } 1011 1012 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 1013 struct gfs2_log_descriptor *ld, 1014 __be64 *ptr, int pass) 1015 { 1016 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 1017 struct gfs2_glock *gl = ip->i_gl; 1018 unsigned int blks = be32_to_cpu(ld->ld_data1); 1019 struct buffer_head *bh_log, *bh_ip; 1020 u64 blkno; 1021 u64 esc; 1022 int error = 0; 1023 1024 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA) 1025 return 0; 1026 1027 gfs2_replay_incr_blk(jd, &start); 1028 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 1029 blkno = be64_to_cpu(*ptr++); 1030 esc = be64_to_cpu(*ptr++); 1031 1032 jd->jd_found_blocks++; 1033 1034 if (gfs2_revoke_check(jd, blkno, start)) 1035 continue; 1036 1037 error = gfs2_replay_read_block(jd, start, &bh_log); 1038 if (error) 1039 return error; 1040 1041 bh_ip = gfs2_meta_new(gl, blkno); 1042 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size); 1043 1044 /* Unescape */ 1045 if (esc) { 1046 __be32 *eptr = (__be32 *)bh_ip->b_data; 1047 *eptr = cpu_to_be32(GFS2_MAGIC); 1048 } 1049 mark_buffer_dirty(bh_ip); 1050 1051 brelse(bh_log); 1052 brelse(bh_ip); 1053 1054 jd->jd_replayed_blocks++; 1055 } 1056 1057 return error; 1058 } 1059 1060 /* FIXME: sort out accounting for log blocks etc. */ 1061 1062 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 1063 { 1064 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 1065 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 1066 1067 if (error) { 1068 gfs2_meta_sync(ip->i_gl); 1069 return; 1070 } 1071 if (pass != 1) 1072 return; 1073 1074 /* data sync? */ 1075 gfs2_meta_sync(ip->i_gl); 1076 1077 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n", 1078 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks); 1079 } 1080 1081 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 1082 { 1083 struct list_head *head; 1084 struct gfs2_bufdata *bd; 1085 1086 if (tr == NULL) 1087 return; 1088 1089 head = &tr->tr_databuf; 1090 while (!list_empty(head)) { 1091 bd = list_first_entry(head, struct gfs2_bufdata, bd_list); 1092 list_del_init(&bd->bd_list); 1093 gfs2_unpin(sdp, bd->bd_bh, tr); 1094 } 1095 } 1096 1097 1098 static const struct gfs2_log_operations gfs2_buf_lops = { 1099 .lo_before_commit = buf_lo_before_commit, 1100 .lo_after_commit = buf_lo_after_commit, 1101 .lo_before_scan = buf_lo_before_scan, 1102 .lo_scan_elements = buf_lo_scan_elements, 1103 .lo_after_scan = buf_lo_after_scan, 1104 .lo_name = "buf", 1105 }; 1106 1107 static const struct gfs2_log_operations gfs2_revoke_lops = { 1108 .lo_before_commit = revoke_lo_before_commit, 1109 .lo_after_commit = revoke_lo_after_commit, 1110 .lo_before_scan = revoke_lo_before_scan, 1111 .lo_scan_elements = revoke_lo_scan_elements, 1112 .lo_after_scan = revoke_lo_after_scan, 1113 .lo_name = "revoke", 1114 }; 1115 1116 static const struct gfs2_log_operations gfs2_databuf_lops = { 1117 .lo_before_commit = databuf_lo_before_commit, 1118 .lo_after_commit = databuf_lo_after_commit, 1119 .lo_scan_elements = databuf_lo_scan_elements, 1120 .lo_after_scan = databuf_lo_after_scan, 1121 .lo_name = "databuf", 1122 }; 1123 1124 const struct gfs2_log_operations *gfs2_log_ops[] = { 1125 &gfs2_databuf_lops, 1126 &gfs2_buf_lops, 1127 &gfs2_revoke_lops, 1128 NULL, 1129 }; 1130 1131