journal.c (7a8532b537ca069bbf5ae4890b4f2f79eb856a3a) journal.c (b81c3758c1df0c308ba8b28934fcd63d9dba9c41)
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * linux/fs/jbd2/journal.c
4 *
5 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
6 *
7 * Copyright 1998 Red Hat corp --- All Rights Reserved
8 *

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1446 else
1447 record_size = 4;
1448
1449 if (jbd2_journal_has_csum_v2or3(journal))
1450 space -= sizeof(struct jbd2_journal_block_tail);
1451 return space / record_size;
1452}
1453
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * linux/fs/jbd2/journal.c
4 *
5 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
6 *
7 * Copyright 1998 Red Hat corp --- All Rights Reserved
8 *

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1446 else
1447 record_size = 4;
1448
1449 if (jbd2_journal_has_csum_v2or3(journal))
1450 space -= sizeof(struct jbd2_journal_block_tail);
1451 return space / record_size;
1452}
1453
1454static int jbd2_journal_get_max_txn_bufs(journal_t *journal)
1455{
1456 return (journal->j_total_len - journal->j_fc_wbufsize) / 4;
1457}
1458
1454/*
1459/*
1460 * Base amount of descriptor blocks we reserve for each transaction.
1461 */
1462static int jbd2_descriptor_blocks_per_trans(journal_t *journal)
1463{
1464 int tag_space = journal->j_blocksize - sizeof(journal_header_t);
1465 int tags_per_block;
1466
1467 /* Subtract UUID */
1468 tag_space -= 16;
1469 if (jbd2_journal_has_csum_v2or3(journal))
1470 tag_space -= sizeof(struct jbd2_journal_block_tail);
1471 /* Commit code leaves a slack space of 16 bytes at the end of block */
1472 tags_per_block = (tag_space - 16) / journal_tag_bytes(journal);
1473 /*
1474 * Revoke descriptors are accounted separately so we need to reserve
1475 * space for commit block and normal transaction descriptor blocks.
1476 */
1477 return 1 + DIV_ROUND_UP(jbd2_journal_get_max_txn_bufs(journal),
1478 tags_per_block);
1479}
1480
1481/*
1482 * Initialize number of blocks each transaction reserves for its bookkeeping
1483 * and maximum number of blocks a transaction can use. This needs to be called
1484 * after the journal size and the fastcommit area size are initialized.
1485 */
1486static void jbd2_journal_init_transaction_limits(journal_t *journal)
1487{
1488 journal->j_revoke_records_per_block =
1489 journal_revoke_records_per_block(journal);
1490 journal->j_transaction_overhead_buffers =
1491 jbd2_descriptor_blocks_per_trans(journal);
1492 journal->j_max_transaction_buffers =
1493 jbd2_journal_get_max_txn_bufs(journal);
1494}
1495
1496/*
1455 * Load the on-disk journal superblock and read the key fields into the
1456 * journal_t.
1457 */
1458static int journal_load_superblock(journal_t *journal)
1459{
1460 int err;
1461 struct buffer_head *bh;
1462 journal_superblock_t *sb;

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1487 journal->j_last = be32_to_cpu(sb->s_maxlen);
1488
1489 if (be32_to_cpu(sb->s_maxlen) < journal->j_total_len)
1490 journal->j_total_len = be32_to_cpu(sb->s_maxlen);
1491 /* Precompute checksum seed for all metadata */
1492 if (jbd2_journal_has_csum_v2or3(journal))
1493 journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
1494 sizeof(sb->s_uuid));
1497 * Load the on-disk journal superblock and read the key fields into the
1498 * journal_t.
1499 */
1500static int journal_load_superblock(journal_t *journal)
1501{
1502 int err;
1503 struct buffer_head *bh;
1504 journal_superblock_t *sb;

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1529 journal->j_last = be32_to_cpu(sb->s_maxlen);
1530
1531 if (be32_to_cpu(sb->s_maxlen) < journal->j_total_len)
1532 journal->j_total_len = be32_to_cpu(sb->s_maxlen);
1533 /* Precompute checksum seed for all metadata */
1534 if (jbd2_journal_has_csum_v2or3(journal))
1535 journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
1536 sizeof(sb->s_uuid));
1495 journal->j_revoke_records_per_block =
1496 journal_revoke_records_per_block(journal);
1537 /* After journal features are set, we can compute transaction limits */
1538 jbd2_journal_init_transaction_limits(journal);
1497
1498 if (jbd2_has_feature_fast_commit(journal)) {
1499 journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
1500 journal->j_last = journal->j_fc_last -
1501 jbd2_journal_get_num_fc_blks(sb);
1502 journal->j_fc_first = journal->j_last + 1;
1503 journal->j_fc_off = 0;
1504 }

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1685 snprintf(journal->j_devname, sizeof(journal->j_devname),
1686 "%pg-%lu", journal->j_dev, journal->j_inode->i_ino);
1687 strreplace(journal->j_devname, '/', '!');
1688 jbd2_stats_proc_init(journal);
1689
1690 return journal;
1691}
1692
1539
1540 if (jbd2_has_feature_fast_commit(journal)) {
1541 journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
1542 journal->j_last = journal->j_fc_last -
1543 jbd2_journal_get_num_fc_blks(sb);
1544 journal->j_fc_first = journal->j_last + 1;
1545 journal->j_fc_off = 0;
1546 }

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1727 snprintf(journal->j_devname, sizeof(journal->j_devname),
1728 "%pg-%lu", journal->j_dev, journal->j_inode->i_ino);
1729 strreplace(journal->j_devname, '/', '!');
1730 jbd2_stats_proc_init(journal);
1731
1732 return journal;
1733}
1734
1693static int jbd2_journal_get_max_txn_bufs(journal_t *journal)
1694{
1695 return (journal->j_total_len - journal->j_fc_wbufsize) / 4;
1696}
1697
1698/*
1699 * Given a journal_t structure, initialise the various fields for
1700 * startup of a new journaling session. We use this both when creating
1701 * a journal, and after recovering an old journal to reset it for
1702 * subsequent use.
1703 */
1704
1705static int journal_reset(journal_t *journal)

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1735 }
1736 journal->j_tail = journal->j_head;
1737 journal->j_free = journal->j_last - journal->j_first;
1738
1739 journal->j_tail_sequence = journal->j_transaction_sequence;
1740 journal->j_commit_sequence = journal->j_transaction_sequence - 1;
1741 journal->j_commit_request = journal->j_commit_sequence;
1742
1735/*
1736 * Given a journal_t structure, initialise the various fields for
1737 * startup of a new journaling session. We use this both when creating
1738 * a journal, and after recovering an old journal to reset it for
1739 * subsequent use.
1740 */
1741
1742static int journal_reset(journal_t *journal)

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1772 }
1773 journal->j_tail = journal->j_head;
1774 journal->j_free = journal->j_last - journal->j_first;
1775
1776 journal->j_tail_sequence = journal->j_transaction_sequence;
1777 journal->j_commit_sequence = journal->j_transaction_sequence - 1;
1778 journal->j_commit_request = journal->j_commit_sequence;
1779
1743 journal->j_max_transaction_buffers = jbd2_journal_get_max_txn_bufs(journal);
1744
1745 /*
1746 * Now that journal recovery is done, turn fast commits off here. This
1747 * way, if fast commit was enabled before the crash but if now FS has
1748 * disabled it, we don't enable fast commits.
1749 */
1750 jbd2_clear_feature_fast_commit(journal);
1751
1752 /*

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2277 return -ENOMEM;
2278
2279 journal->j_fc_wbufsize = num_fc_blks;
2280 journal->j_fc_last = journal->j_last;
2281 journal->j_last = journal->j_fc_last - num_fc_blks;
2282 journal->j_fc_first = journal->j_last + 1;
2283 journal->j_fc_off = 0;
2284 journal->j_free = journal->j_last - journal->j_first;
1780 /*
1781 * Now that journal recovery is done, turn fast commits off here. This
1782 * way, if fast commit was enabled before the crash but if now FS has
1783 * disabled it, we don't enable fast commits.
1784 */
1785 jbd2_clear_feature_fast_commit(journal);
1786
1787 /*

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2312 return -ENOMEM;
2313
2314 journal->j_fc_wbufsize = num_fc_blks;
2315 journal->j_fc_last = journal->j_last;
2316 journal->j_last = journal->j_fc_last - num_fc_blks;
2317 journal->j_fc_first = journal->j_last + 1;
2318 journal->j_fc_off = 0;
2319 journal->j_free = journal->j_last - journal->j_first;
2285 journal->j_max_transaction_buffers =
2286 jbd2_journal_get_max_txn_bufs(journal);
2287
2288 return 0;
2289}
2290
2291/**
2292 * jbd2_journal_set_features() - Mark a given journal feature in the superblock
2293 * @journal: Journal to act on.
2294 * @compat: bitmask of compatible features

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2366 sb->s_feature_incompat &=
2367 ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2 |
2368 JBD2_FEATURE_INCOMPAT_CSUM_V3);
2369
2370 sb->s_feature_compat |= cpu_to_be32(compat);
2371 sb->s_feature_ro_compat |= cpu_to_be32(ro);
2372 sb->s_feature_incompat |= cpu_to_be32(incompat);
2373 unlock_buffer(journal->j_sb_buffer);
2320
2321 return 0;
2322}
2323
2324/**
2325 * jbd2_journal_set_features() - Mark a given journal feature in the superblock
2326 * @journal: Journal to act on.
2327 * @compat: bitmask of compatible features

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2399 sb->s_feature_incompat &=
2400 ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2 |
2401 JBD2_FEATURE_INCOMPAT_CSUM_V3);
2402
2403 sb->s_feature_compat |= cpu_to_be32(compat);
2404 sb->s_feature_ro_compat |= cpu_to_be32(ro);
2405 sb->s_feature_incompat |= cpu_to_be32(incompat);
2406 unlock_buffer(journal->j_sb_buffer);
2374 journal->j_revoke_records_per_block =
2375 journal_revoke_records_per_block(journal);
2407 jbd2_journal_init_transaction_limits(journal);
2376
2377 return 1;
2378#undef COMPAT_FEATURE_ON
2379#undef INCOMPAT_FEATURE_ON
2380}
2381
2382/*
2383 * jbd2_journal_clear_features() - Clear a given journal feature in the

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2398 jbd2_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n",
2399 compat, ro, incompat);
2400
2401 sb = journal->j_superblock;
2402
2403 sb->s_feature_compat &= ~cpu_to_be32(compat);
2404 sb->s_feature_ro_compat &= ~cpu_to_be32(ro);
2405 sb->s_feature_incompat &= ~cpu_to_be32(incompat);
2408
2409 return 1;
2410#undef COMPAT_FEATURE_ON
2411#undef INCOMPAT_FEATURE_ON
2412}
2413
2414/*
2415 * jbd2_journal_clear_features() - Clear a given journal feature in the

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2430 jbd2_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n",
2431 compat, ro, incompat);
2432
2433 sb = journal->j_superblock;
2434
2435 sb->s_feature_compat &= ~cpu_to_be32(compat);
2436 sb->s_feature_ro_compat &= ~cpu_to_be32(ro);
2437 sb->s_feature_incompat &= ~cpu_to_be32(incompat);
2406 journal->j_revoke_records_per_block =
2407 journal_revoke_records_per_block(journal);
2438 jbd2_journal_init_transaction_limits(journal);
2408}
2409EXPORT_SYMBOL(jbd2_journal_clear_features);
2410
2411/**
2412 * jbd2_journal_flush() - Flush journal
2413 * @journal: Journal to act on.
2414 * @flags: optional operation on the journal blocks after the flush (see below)
2415 *

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2440EXPORT_SYMBOL(jbd2_journal_clear_features);
2441
2442/**
2443 * jbd2_journal_flush() - Flush journal
2444 * @journal: Journal to act on.
2445 * @flags: optional operation on the journal blocks after the flush (see below)
2446 *

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