journal.c (01b5adcebb977bc61b64167adce6d8260c9da33c) journal.c (4fd5ea43bc11602bfabe2c8f5378586d34bd2b0a)
1/*
2 * linux/fs/jbd2/journal.c
3 *
4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
5 *
6 * Copyright 1998 Red Hat corp --- All Rights Reserved
7 *
8 * This file is part of the Linux kernel and is made available under

--- 92 unchanged lines hidden (view full) ---

101int jbd2_verify_csum_type(journal_t *j, journal_superblock_t *sb)
102{
103 if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
104 return 1;
105
106 return sb->s_checksum_type == JBD2_CRC32C_CHKSUM;
107}
108
1/*
2 * linux/fs/jbd2/journal.c
3 *
4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
5 *
6 * Copyright 1998 Red Hat corp --- All Rights Reserved
7 *
8 * This file is part of the Linux kernel and is made available under

--- 92 unchanged lines hidden (view full) ---

101int jbd2_verify_csum_type(journal_t *j, journal_superblock_t *sb)
102{
103 if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
104 return 1;
105
106 return sb->s_checksum_type == JBD2_CRC32C_CHKSUM;
107}
108
109static __u32 jbd2_superblock_csum(journal_t *j, journal_superblock_t *sb)
110{
111 __u32 csum, old_csum;
112
113 old_csum = sb->s_checksum;
114 sb->s_checksum = 0;
115 csum = jbd2_chksum(j, ~0, (char *)sb, sizeof(journal_superblock_t));
116 sb->s_checksum = old_csum;
117
118 return cpu_to_be32(csum);
119}
120
121int jbd2_superblock_csum_verify(journal_t *j, journal_superblock_t *sb)
122{
123 if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
124 return 1;
125
126 return sb->s_checksum == jbd2_superblock_csum(j, sb);
127}
128
129void jbd2_superblock_csum_set(journal_t *j, journal_superblock_t *sb)
130{
131 if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
132 return;
133
134 sb->s_checksum = jbd2_superblock_csum(j, sb);
135}
136
109/*
110 * Helper function used to manage commit timeouts
111 */
112
113static void commit_timeout(unsigned long __data)
114{
115 struct task_struct * p = (struct task_struct *) __data;
116

--- 1235 unchanged lines hidden (view full) ---

1352static void jbd2_journal_update_sb_errno(journal_t *journal)
1353{
1354 journal_superblock_t *sb = journal->j_superblock;
1355
1356 read_lock(&journal->j_state_lock);
1357 jbd_debug(1, "JBD2: updating superblock error (errno %d)\n",
1358 journal->j_errno);
1359 sb->s_errno = cpu_to_be32(journal->j_errno);
137/*
138 * Helper function used to manage commit timeouts
139 */
140
141static void commit_timeout(unsigned long __data)
142{
143 struct task_struct * p = (struct task_struct *) __data;
144

--- 1235 unchanged lines hidden (view full) ---

1380static void jbd2_journal_update_sb_errno(journal_t *journal)
1381{
1382 journal_superblock_t *sb = journal->j_superblock;
1383
1384 read_lock(&journal->j_state_lock);
1385 jbd_debug(1, "JBD2: updating superblock error (errno %d)\n",
1386 journal->j_errno);
1387 sb->s_errno = cpu_to_be32(journal->j_errno);
1388 jbd2_superblock_csum_set(journal, sb);
1360 read_unlock(&journal->j_state_lock);
1361
1362 jbd2_write_superblock(journal, WRITE_SYNC);
1363}
1364
1365/*
1366 * Read the superblock for a given journal, performing initial
1367 * validation of the format.

--- 76 unchanged lines hidden (view full) ---

1444 if (IS_ERR(journal->j_chksum_driver)) {
1445 printk(KERN_ERR "JBD: Cannot load crc32c driver.\n");
1446 err = PTR_ERR(journal->j_chksum_driver);
1447 journal->j_chksum_driver = NULL;
1448 goto out;
1449 }
1450 }
1451
1389 read_unlock(&journal->j_state_lock);
1390
1391 jbd2_write_superblock(journal, WRITE_SYNC);
1392}
1393
1394/*
1395 * Read the superblock for a given journal, performing initial
1396 * validation of the format.

--- 76 unchanged lines hidden (view full) ---

1473 if (IS_ERR(journal->j_chksum_driver)) {
1474 printk(KERN_ERR "JBD: Cannot load crc32c driver.\n");
1475 err = PTR_ERR(journal->j_chksum_driver);
1476 journal->j_chksum_driver = NULL;
1477 goto out;
1478 }
1479 }
1480
1481 /* Check superblock checksum */
1482 if (!jbd2_superblock_csum_verify(journal, sb)) {
1483 printk(KERN_ERR "JBD: journal checksum error\n");
1484 goto out;
1485 }
1486
1487 /* Precompute checksum seed for all metadata */
1488 if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2))
1489 journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
1490 sizeof(sb->s_uuid));
1491
1452 set_buffer_verified(bh);
1453
1454 return 0;
1455
1456out:
1457 journal_fail_superblock(journal);
1458 return err;
1459}

--- 267 unchanged lines hidden (view full) ---

1727 0, 0);
1728 if (IS_ERR(journal->j_chksum_driver)) {
1729 printk(KERN_ERR "JBD: Cannot load crc32c "
1730 "driver.\n");
1731 journal->j_chksum_driver = NULL;
1732 return 0;
1733 }
1734 }
1492 set_buffer_verified(bh);
1493
1494 return 0;
1495
1496out:
1497 journal_fail_superblock(journal);
1498 return err;
1499}

--- 267 unchanged lines hidden (view full) ---

1767 0, 0);
1768 if (IS_ERR(journal->j_chksum_driver)) {
1769 printk(KERN_ERR "JBD: Cannot load crc32c "
1770 "driver.\n");
1771 journal->j_chksum_driver = NULL;
1772 return 0;
1773 }
1774 }
1775
1776 /* Precompute checksum seed for all metadata */
1777 if (JBD2_HAS_INCOMPAT_FEATURE(journal,
1778 JBD2_FEATURE_INCOMPAT_CSUM_V2))
1779 journal->j_csum_seed = jbd2_chksum(journal, ~0,
1780 sb->s_uuid,
1781 sizeof(sb->s_uuid));
1735 }
1736
1737 /* If enabling v1 checksums, downgrade superblock */
1738 if (COMPAT_FEATURE_ON(JBD2_FEATURE_COMPAT_CHECKSUM))
1739 sb->s_feature_incompat &=
1740 ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2);
1741
1742 sb->s_feature_compat |= cpu_to_be32(compat);

--- 835 unchanged lines hidden --- 		1782 }
1783
1784 /* If enabling v1 checksums, downgrade superblock */
1785 if (COMPAT_FEATURE_ON(JBD2_FEATURE_COMPAT_CHECKSUM))
1786 sb->s_feature_incompat &=
1787 ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2);
1788
1789 sb->s_feature_compat |= cpu_to_be32(compat);

--- 835 unchanged lines hidden ---