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authorDarrick J. Wong <darrick.wong@oracle.com>2013-08-28 14:59:58 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-08-28 14:59:58 -0400
commit18a6ea1e5cc88ba36e66c193196da802b06d5cb0 (patch)
tree783980ea5139de37bbb2c01124a42c2c53a9f83b
parentd7b2a00c2e2eedf460ce2a15237f28de40412d86 (diff)
jbd2: Fix endian mixing problems in the checksumming code
In the jbd2 checksumming code, explicitly declare separate variables with endianness information so that we don't get confused and screw things up again. Also fixes sparse warnings. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
-rw-r--r--fs/jbd2/commit.c6
-rw-r--r--fs/jbd2/journal.c5
-rw-r--r--fs/jbd2/recovery.c24
3 files changed, 18 insertions, 17 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 559bec1a37b..cf2fc059406 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -343,14 +343,14 @@ static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
struct page *page = bh->b_page;
__u8 *addr;
__u32 csum32;
+ __be32 seq;
if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
return;
- sequence = cpu_to_be32(sequence);
+ seq = cpu_to_be32(sequence);
addr = kmap_atomic(page);
- csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence,
- sizeof(sequence));
+ csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq));
csum32 = jbd2_chksum(j, csum32, addr + offset_in_page(bh->b_data),
bh->b_size);
kunmap_atomic(addr);
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 02c7ad9d7a4..52032647dd4 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -130,9 +130,10 @@ int jbd2_verify_csum_type(journal_t *j, journal_superblock_t *sb)
return sb->s_checksum_type == JBD2_CRC32C_CHKSUM;
}
-static __u32 jbd2_superblock_csum(journal_t *j, journal_superblock_t *sb)
+static __be32 jbd2_superblock_csum(journal_t *j, journal_superblock_t *sb)
{
- __u32 csum, old_csum;
+ __u32 csum;
+ __be32 old_csum;
old_csum = sb->s_checksum;
sb->s_checksum = 0;
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index d4851464b57..3929c50428b 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -178,7 +178,8 @@ static int jbd2_descr_block_csum_verify(journal_t *j,
void *buf)
{
struct jbd2_journal_block_tail *tail;
- __u32 provided, calculated;
+ __be32 provided;
+ __u32 calculated;
if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
return 1;
@@ -190,8 +191,7 @@ static int jbd2_descr_block_csum_verify(journal_t *j,
calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize);
tail->t_checksum = provided;
- provided = be32_to_cpu(provided);
- return provided == calculated;
+ return provided == cpu_to_be32(calculated);
}
/*
@@ -381,7 +381,8 @@ static int calc_chksums(journal_t *journal, struct buffer_head *bh,
static int jbd2_commit_block_csum_verify(journal_t *j, void *buf)
{
struct commit_header *h;
- __u32 provided, calculated;
+ __be32 provided;
+ __u32 calculated;
if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
return 1;
@@ -392,21 +393,20 @@ static int jbd2_commit_block_csum_verify(journal_t *j, void *buf)
calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize);
h->h_chksum[0] = provided;
- provided = be32_to_cpu(provided);
- return provided == calculated;
+ return provided == cpu_to_be32(calculated);
}
static int jbd2_block_tag_csum_verify(journal_t *j, journal_block_tag_t *tag,
void *buf, __u32 sequence)
{
__u32 csum32;
+ __be32 seq;
if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
return 1;
- sequence = cpu_to_be32(sequence);
- csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence,
- sizeof(sequence));
+ seq = cpu_to_be32(sequence);
+ csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq));
csum32 = jbd2_chksum(j, csum32, buf, j->j_blocksize);
return tag->t_checksum == cpu_to_be16(csum32);
@@ -808,7 +808,8 @@ static int jbd2_revoke_block_csum_verify(journal_t *j,
void *buf)
{
struct jbd2_journal_revoke_tail *tail;
- __u32 provided, calculated;
+ __be32 provided;
+ __u32 calculated;
if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
return 1;
@@ -820,8 +821,7 @@ static int jbd2_revoke_block_csum_verify(journal_t *j,
calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize);
tail->r_checksum = provided;
- provided = be32_to_cpu(provided);
- return provided == calculated;
+ return provided == cpu_to_be32(calculated);
}
/* Scan a revoke record, marking all blocks mentioned as revoked. */