1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/sched.h> 11 #include <linux/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/mempool.h> 16 #include <linux/gfs2_ondisk.h> 17 #include <linux/bio.h> 18 #include <linux/fs.h> 19 #include <linux/list_sort.h> 20 #include <linux/blkdev.h> 21 22 #include "bmap.h" 23 #include "dir.h" 24 #include "gfs2.h" 25 #include "incore.h" 26 #include "inode.h" 27 #include "glock.h" 28 #include "log.h" 29 #include "lops.h" 30 #include "meta_io.h" 31 #include "recovery.h" 32 #include "rgrp.h" 33 #include "trans.h" 34 #include "util.h" 35 #include "trace_gfs2.h" 36 37 /** 38 * gfs2_pin - Pin a buffer in memory 39 * @sdp: The superblock 40 * @bh: The buffer to be pinned 41 * 42 * The log lock must be held when calling this function 43 */ 44 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) 45 { 46 struct gfs2_bufdata *bd; 47 48 BUG_ON(!current->journal_info); 49 50 clear_buffer_dirty(bh); 51 if (test_set_buffer_pinned(bh)) 52 gfs2_assert_withdraw(sdp, 0); 53 if (!buffer_uptodate(bh)) 54 gfs2_io_error_bh_wd(sdp, bh); 55 bd = bh->b_private; 56 /* If this buffer is in the AIL and it has already been written 57 * to in-place disk block, remove it from the AIL. 58 */ 59 spin_lock(&sdp->sd_ail_lock); 60 if (bd->bd_tr) 61 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list); 62 spin_unlock(&sdp->sd_ail_lock); 63 get_bh(bh); 64 atomic_inc(&sdp->sd_log_pinned); 65 trace_gfs2_pin(bd, 1); 66 } 67 68 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd) 69 { 70 return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP; 71 } 72 73 static void maybe_release_space(struct gfs2_bufdata *bd) 74 { 75 struct gfs2_glock *gl = bd->bd_gl; 76 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 77 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl); 78 unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number; 79 struct gfs2_bitmap *bi = rgd->rd_bits + index; 80 81 if (bi->bi_clone == NULL) 82 return; 83 if (sdp->sd_args.ar_discard) 84 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL); 85 memcpy(bi->bi_clone + bi->bi_offset, 86 bd->bd_bh->b_data + bi->bi_offset, bi->bi_bytes); 87 clear_bit(GBF_FULL, &bi->bi_flags); 88 rgd->rd_free_clone = rgd->rd_free; 89 rgd->rd_extfail_pt = rgd->rd_free; 90 } 91 92 /** 93 * gfs2_unpin - Unpin a buffer 94 * @sdp: the filesystem the buffer belongs to 95 * @bh: The buffer to unpin 96 * @ai: 97 * @flags: The inode dirty flags 98 * 99 */ 100 101 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, 102 struct gfs2_trans *tr) 103 { 104 struct gfs2_bufdata *bd = bh->b_private; 105 106 BUG_ON(!buffer_uptodate(bh)); 107 BUG_ON(!buffer_pinned(bh)); 108 109 lock_buffer(bh); 110 mark_buffer_dirty(bh); 111 clear_buffer_pinned(bh); 112 113 if (buffer_is_rgrp(bd)) 114 maybe_release_space(bd); 115 116 spin_lock(&sdp->sd_ail_lock); 117 if (bd->bd_tr) { 118 list_del(&bd->bd_ail_st_list); 119 brelse(bh); 120 } else { 121 struct gfs2_glock *gl = bd->bd_gl; 122 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list); 123 atomic_inc(&gl->gl_ail_count); 124 } 125 bd->bd_tr = tr; 126 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list); 127 spin_unlock(&sdp->sd_ail_lock); 128 129 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 130 trace_gfs2_pin(bd, 0); 131 unlock_buffer(bh); 132 atomic_dec(&sdp->sd_log_pinned); 133 } 134 135 static void gfs2_log_incr_head(struct gfs2_sbd *sdp) 136 { 137 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) && 138 (sdp->sd_log_flush_head != sdp->sd_log_head)); 139 140 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) 141 sdp->sd_log_flush_head = 0; 142 } 143 144 u64 gfs2_log_bmap(struct gfs2_sbd *sdp) 145 { 146 unsigned int lbn = sdp->sd_log_flush_head; 147 struct gfs2_journal_extent *je; 148 u64 block; 149 150 list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) { 151 if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) { 152 block = je->dblock + lbn - je->lblock; 153 gfs2_log_incr_head(sdp); 154 return block; 155 } 156 } 157 158 return -1; 159 } 160 161 /** 162 * gfs2_end_log_write_bh - end log write of pagecache data with buffers 163 * @sdp: The superblock 164 * @bvec: The bio_vec 165 * @error: The i/o status 166 * 167 * This finds the relevant buffers and unlocks them and sets the 168 * error flag according to the status of the i/o request. This is 169 * used when the log is writing data which has an in-place version 170 * that is pinned in the pagecache. 171 */ 172 173 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, 174 struct bio_vec *bvec, 175 blk_status_t error) 176 { 177 struct buffer_head *bh, *next; 178 struct page *page = bvec->bv_page; 179 unsigned size; 180 181 bh = page_buffers(page); 182 size = bvec->bv_len; 183 while (bh_offset(bh) < bvec->bv_offset) 184 bh = bh->b_this_page; 185 do { 186 if (error) 187 mark_buffer_write_io_error(bh); 188 unlock_buffer(bh); 189 next = bh->b_this_page; 190 size -= bh->b_size; 191 brelse(bh); 192 bh = next; 193 } while(bh && size); 194 } 195 196 /** 197 * gfs2_end_log_write - end of i/o to the log 198 * @bio: The bio 199 * 200 * Each bio_vec contains either data from the pagecache or data 201 * relating to the log itself. Here we iterate over the bio_vec 202 * array, processing both kinds of data. 203 * 204 */ 205 206 static void gfs2_end_log_write(struct bio *bio) 207 { 208 struct gfs2_sbd *sdp = bio->bi_private; 209 struct bio_vec *bvec; 210 struct page *page; 211 int i; 212 struct bvec_iter_all iter_all; 213 214 if (bio->bi_status) { 215 fs_err(sdp, "Error %d writing to journal, jid=%u\n", 216 bio->bi_status, sdp->sd_jdesc->jd_jid); 217 wake_up(&sdp->sd_logd_waitq); 218 } 219 220 bio_for_each_segment_all(bvec, bio, i, iter_all) { 221 page = bvec->bv_page; 222 if (page_has_buffers(page)) 223 gfs2_end_log_write_bh(sdp, bvec, bio->bi_status); 224 else 225 mempool_free(page, gfs2_page_pool); 226 } 227 228 bio_put(bio); 229 if (atomic_dec_and_test(&sdp->sd_log_in_flight)) 230 wake_up(&sdp->sd_log_flush_wait); 231 } 232 233 /** 234 * gfs2_log_submit_bio - Submit any pending log bio 235 * @biop: Address of the bio pointer 236 * @opf: REQ_OP | op_flags 237 * 238 * Submit any pending part-built or full bio to the block device. If 239 * there is no pending bio, then this is a no-op. 240 */ 241 242 void gfs2_log_submit_bio(struct bio **biop, int opf) 243 { 244 struct bio *bio = *biop; 245 if (bio) { 246 struct gfs2_sbd *sdp = bio->bi_private; 247 atomic_inc(&sdp->sd_log_in_flight); 248 bio->bi_opf = opf; 249 submit_bio(bio); 250 *biop = NULL; 251 } 252 } 253 254 /** 255 * gfs2_log_alloc_bio - Allocate a bio 256 * @sdp: The super block 257 * @blkno: The device block number we want to write to 258 * @end_io: The bi_end_io callback 259 * 260 * Allocate a new bio, initialize it with the given parameters and return it. 261 * 262 * Returns: The newly allocated bio 263 */ 264 265 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno, 266 bio_end_io_t *end_io) 267 { 268 struct super_block *sb = sdp->sd_vfs; 269 struct bio *bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); 270 271 bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9); 272 bio_set_dev(bio, sb->s_bdev); 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 * @bio: 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, int 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 * @page: the page to write 320 * @size: the size of the data to write 321 * @offset: the offset within the page 322 * @blkno: block number of the log entry 323 * 324 * Try and add the page segment to the current bio. If that fails, 325 * submit the current bio to the device and create a new one, and 326 * then add the page segment to that. 327 */ 328 329 void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page, 330 unsigned size, unsigned offset, u64 blkno) 331 { 332 struct bio *bio; 333 int ret; 334 335 bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio, REQ_OP_WRITE, 336 gfs2_end_log_write, false); 337 ret = bio_add_page(bio, page, size, offset); 338 if (ret == 0) { 339 bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio, 340 REQ_OP_WRITE, gfs2_end_log_write, true); 341 ret = bio_add_page(bio, page, size, offset); 342 WARN_ON(ret == 0); 343 } 344 } 345 346 /** 347 * gfs2_log_write_bh - write a buffer's content to the log 348 * @sdp: The super block 349 * @bh: The buffer pointing to the in-place location 350 * 351 * This writes the content of the buffer to the next available location 352 * in the log. The buffer will be unlocked once the i/o to the log has 353 * completed. 354 */ 355 356 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh) 357 { 358 gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh), 359 gfs2_log_bmap(sdp)); 360 } 361 362 /** 363 * gfs2_log_write_page - write one block stored in a page, into the log 364 * @sdp: The superblock 365 * @page: The struct page 366 * 367 * This writes the first block-sized part of the page into the log. Note 368 * that the page must have been allocated from the gfs2_page_pool mempool 369 * and that after this has been called, ownership has been transferred and 370 * the page may be freed at any time. 371 */ 372 373 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page) 374 { 375 struct super_block *sb = sdp->sd_vfs; 376 gfs2_log_write(sdp, page, sb->s_blocksize, 0, 377 gfs2_log_bmap(sdp)); 378 } 379 380 /** 381 * gfs2_end_log_read - end I/O callback for reads from the log 382 * @bio: The bio 383 * 384 * Simply unlock the pages in the bio. The main thread will wait on them and 385 * process them in order as necessary. 386 */ 387 388 static void gfs2_end_log_read(struct bio *bio) 389 { 390 struct page *page; 391 struct bio_vec *bvec; 392 int i; 393 struct bvec_iter_all iter_all; 394 395 bio_for_each_segment_all(bvec, bio, i, 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 /** 480 * gfs2_find_jhead - find the head of a log 481 * @jd: The journal descriptor 482 * @head: The log descriptor for the head of the log is returned here 483 * 484 * Do a search of a journal by reading it in large chunks using bios and find 485 * the valid log entry with the highest sequence number. (i.e. the log head) 486 * 487 * Returns: 0 on success, errno otherwise 488 */ 489 int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head, 490 bool keep_cache) 491 { 492 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 493 struct address_space *mapping = jd->jd_inode->i_mapping; 494 unsigned int block = 0, blocks_submitted = 0, blocks_read = 0; 495 unsigned int bsize = sdp->sd_sb.sb_bsize; 496 unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift; 497 unsigned int shift = PAGE_SHIFT - bsize_shift; 498 unsigned int readhead_blocks = BIO_MAX_PAGES << shift; 499 struct gfs2_journal_extent *je; 500 int sz, ret = 0; 501 struct bio *bio = NULL; 502 struct page *page = NULL; 503 bool done = false; 504 errseq_t since; 505 506 memset(head, 0, sizeof(*head)); 507 if (list_empty(&jd->extent_list)) 508 gfs2_map_journal_extents(sdp, jd); 509 510 since = filemap_sample_wb_err(mapping); 511 list_for_each_entry(je, &jd->extent_list, list) { 512 for (; block < je->lblock + je->blocks; block++) { 513 u64 dblock; 514 515 if (!page) { 516 page = find_or_create_page(mapping, 517 block >> shift, GFP_NOFS); 518 if (!page) { 519 ret = -ENOMEM; 520 done = true; 521 goto out; 522 } 523 } 524 525 if (bio) { 526 unsigned int off; 527 528 off = (block << bsize_shift) & ~PAGE_MASK; 529 sz = bio_add_page(bio, page, bsize, off); 530 if (sz == bsize) { /* block added */ 531 if (off + bsize == PAGE_SIZE) { 532 page = NULL; 533 goto page_added; 534 } 535 continue; 536 } 537 blocks_submitted = block + 1; 538 submit_bio(bio); 539 bio = NULL; 540 } 541 542 dblock = je->dblock + (block - je->lblock); 543 bio = gfs2_log_alloc_bio(sdp, dblock, gfs2_end_log_read); 544 bio->bi_opf = REQ_OP_READ; 545 sz = bio_add_page(bio, page, bsize, 0); 546 gfs2_assert_warn(sdp, sz == bsize); 547 if (bsize == PAGE_SIZE) 548 page = NULL; 549 550 page_added: 551 if (blocks_submitted < blocks_read + readhead_blocks) { 552 /* Keep at least one bio in flight */ 553 continue; 554 } 555 556 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); 557 blocks_read += PAGE_SIZE >> bsize_shift; 558 if (done) 559 goto out; /* found */ 560 } 561 } 562 563 out: 564 if (bio) 565 submit_bio(bio); 566 while (blocks_read < block) { 567 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); 568 blocks_read += PAGE_SIZE >> bsize_shift; 569 } 570 571 if (!ret) 572 ret = filemap_check_wb_err(mapping, since); 573 574 if (!keep_cache) 575 truncate_inode_pages(mapping, 0); 576 577 return ret; 578 } 579 580 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type, 581 u32 ld_length, u32 ld_data1) 582 { 583 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 584 struct gfs2_log_descriptor *ld = page_address(page); 585 clear_page(ld); 586 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 587 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD); 588 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD); 589 ld->ld_type = cpu_to_be32(ld_type); 590 ld->ld_length = cpu_to_be32(ld_length); 591 ld->ld_data1 = cpu_to_be32(ld_data1); 592 ld->ld_data2 = 0; 593 return page; 594 } 595 596 static void gfs2_check_magic(struct buffer_head *bh) 597 { 598 void *kaddr; 599 __be32 *ptr; 600 601 clear_buffer_escaped(bh); 602 kaddr = kmap_atomic(bh->b_page); 603 ptr = kaddr + bh_offset(bh); 604 if (*ptr == cpu_to_be32(GFS2_MAGIC)) 605 set_buffer_escaped(bh); 606 kunmap_atomic(kaddr); 607 } 608 609 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b) 610 { 611 struct gfs2_bufdata *bda, *bdb; 612 613 bda = list_entry(a, struct gfs2_bufdata, bd_list); 614 bdb = list_entry(b, struct gfs2_bufdata, bd_list); 615 616 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr) 617 return -1; 618 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr) 619 return 1; 620 return 0; 621 } 622 623 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit, 624 unsigned int total, struct list_head *blist, 625 bool is_databuf) 626 { 627 struct gfs2_log_descriptor *ld; 628 struct gfs2_bufdata *bd1 = NULL, *bd2; 629 struct page *page; 630 unsigned int num; 631 unsigned n; 632 __be64 *ptr; 633 634 gfs2_log_lock(sdp); 635 list_sort(NULL, blist, blocknr_cmp); 636 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list); 637 while(total) { 638 num = total; 639 if (total > limit) 640 num = limit; 641 gfs2_log_unlock(sdp); 642 page = gfs2_get_log_desc(sdp, 643 is_databuf ? GFS2_LOG_DESC_JDATA : 644 GFS2_LOG_DESC_METADATA, num + 1, num); 645 ld = page_address(page); 646 gfs2_log_lock(sdp); 647 ptr = (__be64 *)(ld + 1); 648 649 n = 0; 650 list_for_each_entry_continue(bd1, blist, bd_list) { 651 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr); 652 if (is_databuf) { 653 gfs2_check_magic(bd1->bd_bh); 654 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0); 655 } 656 if (++n >= num) 657 break; 658 } 659 660 gfs2_log_unlock(sdp); 661 gfs2_log_write_page(sdp, page); 662 gfs2_log_lock(sdp); 663 664 n = 0; 665 list_for_each_entry_continue(bd2, blist, bd_list) { 666 get_bh(bd2->bd_bh); 667 gfs2_log_unlock(sdp); 668 lock_buffer(bd2->bd_bh); 669 670 if (buffer_escaped(bd2->bd_bh)) { 671 void *kaddr; 672 page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 673 ptr = page_address(page); 674 kaddr = kmap_atomic(bd2->bd_bh->b_page); 675 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh), 676 bd2->bd_bh->b_size); 677 kunmap_atomic(kaddr); 678 *(__be32 *)ptr = 0; 679 clear_buffer_escaped(bd2->bd_bh); 680 unlock_buffer(bd2->bd_bh); 681 brelse(bd2->bd_bh); 682 gfs2_log_write_page(sdp, page); 683 } else { 684 gfs2_log_write_bh(sdp, bd2->bd_bh); 685 } 686 gfs2_log_lock(sdp); 687 if (++n >= num) 688 break; 689 } 690 691 BUG_ON(total < num); 692 total -= num; 693 } 694 gfs2_log_unlock(sdp); 695 } 696 697 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 698 { 699 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */ 700 unsigned int nbuf; 701 if (tr == NULL) 702 return; 703 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm; 704 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0); 705 } 706 707 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 708 { 709 struct list_head *head; 710 struct gfs2_bufdata *bd; 711 712 if (tr == NULL) 713 return; 714 715 head = &tr->tr_buf; 716 while (!list_empty(head)) { 717 bd = list_entry(head->next, struct gfs2_bufdata, bd_list); 718 list_del_init(&bd->bd_list); 719 gfs2_unpin(sdp, bd->bd_bh, tr); 720 } 721 } 722 723 static void buf_lo_before_scan(struct gfs2_jdesc *jd, 724 struct gfs2_log_header_host *head, int pass) 725 { 726 if (pass != 0) 727 return; 728 729 jd->jd_found_blocks = 0; 730 jd->jd_replayed_blocks = 0; 731 } 732 733 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 734 struct gfs2_log_descriptor *ld, __be64 *ptr, 735 int pass) 736 { 737 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 738 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 739 struct gfs2_glock *gl = ip->i_gl; 740 unsigned int blks = be32_to_cpu(ld->ld_data1); 741 struct buffer_head *bh_log, *bh_ip; 742 u64 blkno; 743 int error = 0; 744 745 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA) 746 return 0; 747 748 gfs2_replay_incr_blk(jd, &start); 749 750 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 751 blkno = be64_to_cpu(*ptr++); 752 753 jd->jd_found_blocks++; 754 755 if (gfs2_revoke_check(jd, blkno, start)) 756 continue; 757 758 error = gfs2_replay_read_block(jd, start, &bh_log); 759 if (error) 760 return error; 761 762 bh_ip = gfs2_meta_new(gl, blkno); 763 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size); 764 765 if (gfs2_meta_check(sdp, bh_ip)) 766 error = -EIO; 767 else 768 mark_buffer_dirty(bh_ip); 769 770 brelse(bh_log); 771 brelse(bh_ip); 772 773 if (error) 774 break; 775 776 jd->jd_replayed_blocks++; 777 } 778 779 return error; 780 } 781 782 /** 783 * gfs2_meta_sync - Sync all buffers associated with a glock 784 * @gl: The glock 785 * 786 */ 787 788 static void gfs2_meta_sync(struct gfs2_glock *gl) 789 { 790 struct address_space *mapping = gfs2_glock2aspace(gl); 791 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 792 int error; 793 794 if (mapping == NULL) 795 mapping = &sdp->sd_aspace; 796 797 filemap_fdatawrite(mapping); 798 error = filemap_fdatawait(mapping); 799 800 if (error) 801 gfs2_io_error(gl->gl_name.ln_sbd); 802 } 803 804 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 805 { 806 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 807 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 808 809 if (error) { 810 gfs2_meta_sync(ip->i_gl); 811 return; 812 } 813 if (pass != 1) 814 return; 815 816 gfs2_meta_sync(ip->i_gl); 817 818 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n", 819 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks); 820 } 821 822 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 823 { 824 struct gfs2_meta_header *mh; 825 unsigned int offset; 826 struct list_head *head = &sdp->sd_log_revokes; 827 struct gfs2_bufdata *bd; 828 struct page *page; 829 unsigned int length; 830 831 gfs2_write_revokes(sdp); 832 if (!sdp->sd_log_num_revoke) 833 return; 834 835 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64)); 836 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke); 837 offset = sizeof(struct gfs2_log_descriptor); 838 839 list_for_each_entry(bd, head, bd_list) { 840 sdp->sd_log_num_revoke--; 841 842 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) { 843 844 gfs2_log_write_page(sdp, page); 845 page = mempool_alloc(gfs2_page_pool, GFP_NOIO); 846 mh = page_address(page); 847 clear_page(mh); 848 mh->mh_magic = cpu_to_be32(GFS2_MAGIC); 849 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB); 850 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB); 851 offset = sizeof(struct gfs2_meta_header); 852 } 853 854 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno); 855 offset += sizeof(u64); 856 } 857 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 858 859 gfs2_log_write_page(sdp, page); 860 } 861 862 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 863 { 864 struct list_head *head = &sdp->sd_log_revokes; 865 struct gfs2_bufdata *bd, *tmp; 866 867 /* 868 * Glocks can be referenced repeatedly on the revoke list, but the list 869 * only holds one reference. All glocks on the list will have the 870 * GLF_REVOKES flag set initially. 871 */ 872 873 list_for_each_entry_safe(bd, tmp, head, bd_list) { 874 struct gfs2_glock *gl = bd->bd_gl; 875 876 if (test_bit(GLF_REVOKES, &gl->gl_flags)) { 877 /* Keep each glock on the list exactly once. */ 878 clear_bit(GLF_REVOKES, &gl->gl_flags); 879 continue; 880 } 881 list_del(&bd->bd_list); 882 kmem_cache_free(gfs2_bufdata_cachep, bd); 883 } 884 list_for_each_entry_safe(bd, tmp, head, bd_list) { 885 struct gfs2_glock *gl = bd->bd_gl; 886 887 list_del(&bd->bd_list); 888 kmem_cache_free(gfs2_bufdata_cachep, bd); 889 clear_bit(GLF_LFLUSH, &gl->gl_flags); 890 gfs2_glock_queue_put(gl); 891 } 892 /* the list is empty now */ 893 } 894 895 static void revoke_lo_before_scan(struct gfs2_jdesc *jd, 896 struct gfs2_log_header_host *head, int pass) 897 { 898 if (pass != 0) 899 return; 900 901 jd->jd_found_revokes = 0; 902 jd->jd_replay_tail = head->lh_tail; 903 } 904 905 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 906 struct gfs2_log_descriptor *ld, __be64 *ptr, 907 int pass) 908 { 909 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 910 unsigned int blks = be32_to_cpu(ld->ld_length); 911 unsigned int revokes = be32_to_cpu(ld->ld_data1); 912 struct buffer_head *bh; 913 unsigned int offset; 914 u64 blkno; 915 int first = 1; 916 int error; 917 918 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE) 919 return 0; 920 921 offset = sizeof(struct gfs2_log_descriptor); 922 923 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 924 error = gfs2_replay_read_block(jd, start, &bh); 925 if (error) 926 return error; 927 928 if (!first) 929 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB); 930 931 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) { 932 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset)); 933 934 error = gfs2_revoke_add(jd, blkno, start); 935 if (error < 0) { 936 brelse(bh); 937 return error; 938 } 939 else if (error) 940 jd->jd_found_revokes++; 941 942 if (!--revokes) 943 break; 944 offset += sizeof(u64); 945 } 946 947 brelse(bh); 948 offset = sizeof(struct gfs2_meta_header); 949 first = 0; 950 } 951 952 return 0; 953 } 954 955 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 956 { 957 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 958 959 if (error) { 960 gfs2_revoke_clean(jd); 961 return; 962 } 963 if (pass != 1) 964 return; 965 966 fs_info(sdp, "jid=%u: Found %u revoke tags\n", 967 jd->jd_jid, jd->jd_found_revokes); 968 969 gfs2_revoke_clean(jd); 970 } 971 972 /** 973 * databuf_lo_before_commit - Scan the data buffers, writing as we go 974 * 975 */ 976 977 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 978 { 979 unsigned int limit = databuf_limit(sdp); 980 unsigned int nbuf; 981 if (tr == NULL) 982 return; 983 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm; 984 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1); 985 } 986 987 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, 988 struct gfs2_log_descriptor *ld, 989 __be64 *ptr, int pass) 990 { 991 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 992 struct gfs2_glock *gl = ip->i_gl; 993 unsigned int blks = be32_to_cpu(ld->ld_data1); 994 struct buffer_head *bh_log, *bh_ip; 995 u64 blkno; 996 u64 esc; 997 int error = 0; 998 999 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA) 1000 return 0; 1001 1002 gfs2_replay_incr_blk(jd, &start); 1003 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) { 1004 blkno = be64_to_cpu(*ptr++); 1005 esc = be64_to_cpu(*ptr++); 1006 1007 jd->jd_found_blocks++; 1008 1009 if (gfs2_revoke_check(jd, blkno, start)) 1010 continue; 1011 1012 error = gfs2_replay_read_block(jd, start, &bh_log); 1013 if (error) 1014 return error; 1015 1016 bh_ip = gfs2_meta_new(gl, blkno); 1017 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size); 1018 1019 /* Unescape */ 1020 if (esc) { 1021 __be32 *eptr = (__be32 *)bh_ip->b_data; 1022 *eptr = cpu_to_be32(GFS2_MAGIC); 1023 } 1024 mark_buffer_dirty(bh_ip); 1025 1026 brelse(bh_log); 1027 brelse(bh_ip); 1028 1029 jd->jd_replayed_blocks++; 1030 } 1031 1032 return error; 1033 } 1034 1035 /* FIXME: sort out accounting for log blocks etc. */ 1036 1037 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass) 1038 { 1039 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 1040 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 1041 1042 if (error) { 1043 gfs2_meta_sync(ip->i_gl); 1044 return; 1045 } 1046 if (pass != 1) 1047 return; 1048 1049 /* data sync? */ 1050 gfs2_meta_sync(ip->i_gl); 1051 1052 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n", 1053 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks); 1054 } 1055 1056 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 1057 { 1058 struct list_head *head; 1059 struct gfs2_bufdata *bd; 1060 1061 if (tr == NULL) 1062 return; 1063 1064 head = &tr->tr_databuf; 1065 while (!list_empty(head)) { 1066 bd = list_entry(head->next, struct gfs2_bufdata, bd_list); 1067 list_del_init(&bd->bd_list); 1068 gfs2_unpin(sdp, bd->bd_bh, tr); 1069 } 1070 } 1071 1072 1073 static const struct gfs2_log_operations gfs2_buf_lops = { 1074 .lo_before_commit = buf_lo_before_commit, 1075 .lo_after_commit = buf_lo_after_commit, 1076 .lo_before_scan = buf_lo_before_scan, 1077 .lo_scan_elements = buf_lo_scan_elements, 1078 .lo_after_scan = buf_lo_after_scan, 1079 .lo_name = "buf", 1080 }; 1081 1082 static const struct gfs2_log_operations gfs2_revoke_lops = { 1083 .lo_before_commit = revoke_lo_before_commit, 1084 .lo_after_commit = revoke_lo_after_commit, 1085 .lo_before_scan = revoke_lo_before_scan, 1086 .lo_scan_elements = revoke_lo_scan_elements, 1087 .lo_after_scan = revoke_lo_after_scan, 1088 .lo_name = "revoke", 1089 }; 1090 1091 static const struct gfs2_log_operations gfs2_databuf_lops = { 1092 .lo_before_commit = databuf_lo_before_commit, 1093 .lo_after_commit = databuf_lo_after_commit, 1094 .lo_scan_elements = databuf_lo_scan_elements, 1095 .lo_after_scan = databuf_lo_after_scan, 1096 .lo_name = "databuf", 1097 }; 1098 1099 const struct gfs2_log_operations *gfs2_log_ops[] = { 1100 &gfs2_databuf_lops, 1101 &gfs2_buf_lops, 1102 &gfs2_revoke_lops, 1103 NULL, 1104 }; 1105 1106