xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

jbd2: checksum revocation blocks

Browse Source 
Compute and verify revoke blocks inside the journal.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Darrick J. Wong
2012-05-27 08:08:24 -04:00
committed by Theodore Ts'o
parent 4fd5ea43bc
commit 42a7106de6
2 changed files with 48 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
fs/jbd2/recovery.c
View File

@@ -706,6 +706,25 @@ static int do_one_pass(journal_t *journal,
return err;
}
static int jbd2_revoke_block_csum_verify(journal_t *j,
void *buf)
{
struct jbd2_journal_revoke_tail *tail;
__u32 provided, calculated;
if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
return 1;
tail = (struct jbd2_journal_revoke_tail *)(buf + j->j_blocksize -
sizeof(struct jbd2_journal_revoke_tail));
provided = tail->r_checksum;
tail->r_checksum = 0;
calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize);
tail->r_checksum = provided;
provided = be32_to_cpu(provided);
return provided == calculated;
}
/* Scan a revoke record, marking all blocks mentioned as revoked. */
@@ -720,6 +739,9 @@ static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
offset = sizeof(jbd2_journal_revoke_header_t);
max = be32_to_cpu(header->r_count);
if (!jbd2_revoke_block_csum_verify(journal, header))
return -EINVAL;
if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT))
record_len = 8;