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-rw-r--r--fs/jbd2/journal.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 1afb701..63175f9 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -97,6 +97,15 @@ EXPORT_SYMBOL(jbd2_inode_cache);
static void __journal_abort_soft (journal_t *journal, int errno);
static int jbd2_journal_create_slab(size_t slab_size);
+/* Checksumming functions */
+int jbd2_verify_csum_type(journal_t *j, journal_superblock_t *sb)
+{
+ if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ return 1;
+
+ return sb->s_checksum_type == JBD2_CRC32C_CHKSUM;
+}
+
/*
* Helper function used to manage commit timeouts
*/
@@ -1376,6 +1385,9 @@ static int journal_get_superblock(journal_t *journal)
}
}
+ if (buffer_verified(bh))
+ return 0;
+
sb = journal->j_superblock;
err = -EINVAL;
@@ -1413,6 +1425,21 @@ static int journal_get_superblock(journal_t *journal)
goto out;
}
+ if (JBD2_HAS_COMPAT_FEATURE(journal, JBD2_FEATURE_COMPAT_CHECKSUM) &&
+ JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) {
+ /* Can't have checksum v1 and v2 on at the same time! */
+ printk(KERN_ERR "JBD: Can't enable checksumming v1 and v2 "
+ "at the same time!\n");
+ goto out;
+ }
+
+ if (!jbd2_verify_csum_type(journal, sb)) {
+ printk(KERN_ERR "JBD: Unknown checksum type\n");
+ goto out;
+ }
+
+ set_buffer_verified(bh);
+
return 0;
out:
@@ -1653,6 +1680,10 @@ int jbd2_journal_check_available_features (journal_t *journal, unsigned long com
int jbd2_journal_set_features (journal_t *journal, unsigned long compat,
unsigned long ro, unsigned long incompat)
{
+#define INCOMPAT_FEATURE_ON(f) \
+ ((incompat & (f)) && !(sb->s_feature_incompat & cpu_to_be32(f)))
+#define COMPAT_FEATURE_ON(f) \
+ ((compat & (f)) && !(sb->s_feature_compat & cpu_to_be32(f)))
journal_superblock_t *sb;
if (jbd2_journal_check_used_features(journal, compat, ro, incompat))
@@ -1661,16 +1692,35 @@ int jbd2_journal_set_features (journal_t *journal, unsigned long compat,
if (!jbd2_journal_check_available_features(journal, compat, ro, incompat))
return 0;
+ /* Asking for checksumming v2 and v1? Only give them v2. */
+ if (incompat & JBD2_FEATURE_INCOMPAT_CSUM_V2 &&
+ compat & JBD2_FEATURE_COMPAT_CHECKSUM)
+ compat &= ~JBD2_FEATURE_COMPAT_CHECKSUM;
+
jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n",
compat, ro, incompat);
sb = journal->j_superblock;
+ /* If enabling v2 checksums, update superblock */
+ if (INCOMPAT_FEATURE_ON(JBD2_FEATURE_INCOMPAT_CSUM_V2)) {
+ sb->s_checksum_type = JBD2_CRC32C_CHKSUM;
+ sb->s_feature_compat &=
+ ~cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM);
+ }
+
+ /* If enabling v1 checksums, downgrade superblock */
+ if (COMPAT_FEATURE_ON(JBD2_FEATURE_COMPAT_CHECKSUM))
+ sb->s_feature_incompat &=
+ ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2);
+
sb->s_feature_compat |= cpu_to_be32(compat);
sb->s_feature_ro_compat |= cpu_to_be32(ro);
sb->s_feature_incompat |= cpu_to_be32(incompat);
return 1;
+#undef COMPAT_FEATURE_ON
+#undef INCOMPAT_FEATURE_ON
}
/*
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