VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Darrick J. Wong <djwong@us.ibm.com> 2012-05-27 07:50:56 -0400 committer: Theodore Ts'o <tytso@mit.edu> 2012-05-27 07:50:56 -0400 commit: 01b5adcebb977bc61b64167adce6d8260c9da33c parent: 25ed6e8a54df904c875365eebedbd19138a47328
Commit Summary:
jbd2: Grab a reference to the crc32c driver if necessary
Diffstat:
1 file changed, 24 insertions, 0 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 63175f9391ab..f04ab6c4b428 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1438,6 +1438,17 @@ static int journal_get_superblock(journal_t *journal)
 		goto out;
 	}
 
+	/* Load the checksum driver */
+	if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) {
+		journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
+		if (IS_ERR(journal->j_chksum_driver)) {
+			printk(KERN_ERR "JBD: Cannot load crc32c driver.\n");
+			err = PTR_ERR(journal->j_chksum_driver);
+			journal->j_chksum_driver = NULL;
+			goto out;
+		}
+	}
+
 	set_buffer_verified(bh);
 
 	return 0;
@@ -1591,6 +1602,8 @@ int jbd2_journal_destroy(journal_t *journal)
 		iput(journal->j_inode);
 	if (journal->j_revoke)
 		jbd2_journal_destroy_revoke(journal);
+	if (journal->j_chksum_driver)
+		crypto_free_shash(journal->j_chksum_driver);
 	kfree(journal->j_wbuf);
 	kfree(journal);
 
@@ -1707,6 +1720,18 @@ int jbd2_journal_set_features (journal_t *journal, unsigned long compat,
 		sb->s_checksum_type = JBD2_CRC32C_CHKSUM;
 		sb->s_feature_compat &=
 			~cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM);
+
+		/* Load the checksum driver */
+		if (journal->j_chksum_driver == NULL) {
+			journal->j_chksum_driver = crypto_alloc_shash("crc32c",
+								      0, 0);
+			if (IS_ERR(journal->j_chksum_driver)) {
+				printk(KERN_ERR "JBD: Cannot load crc32c "
+				       "driver.\n");
+				journal->j_chksum_driver = NULL;
+				return 0;
+			}
+		}
 	}
 
 	/* If enabling v1 checksums, downgrade superblock */