From: "Darrick J. Wong" Subject: [PATCH 28/28] jbd2: Checksum data blocks that are stored in the journal Date: Sat, 08 Oct 2011 00:56:48 -0700 Message-ID: <20111008075648.20506.27838.stgit@elm3c44.beaverton.ibm.com> References: <20111008075343.20506.23155.stgit@elm3c44.beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Sunil Mushran , Martin K Petersen , Greg Freemyer , Amir Goldstein , linux-kernel , Andi Kleen , Mingming Cao , Joel Becker , linux-fsdevel , linux-ext4@vger.kernel.org, Coly Li To: Andreas Dilger , Theodore Tso , "Darrick J. Wong" Return-path: In-Reply-To: <20111008075343.20506.23155.stgit@elm3c44.beaverton.ibm.com> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Calculate and verify checksums of each data block being stored in the journal. Signed-off-by: Darrick J. Wong --- fs/jbd2/commit.c | 22 ++++++++++++++++++++++ fs/jbd2/journal.c | 10 ++++++++-- fs/jbd2/recovery.c | 30 ++++++++++++++++++++++++++++++ include/linux/jbd2.h | 1 + 4 files changed, 61 insertions(+), 2 deletions(-) diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c index 2bce8dc..0459e19 100644 --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -339,6 +339,26 @@ static void jbd2_descr_block_csum_set(journal_t *j, tail->t_checksum = cpu_to_be32(crc); } +static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, + struct buffer_head *bh, __u32 sequence) +{ + struct page *page = bh->b_page; + __u8 *addr; + __u32 crc; + + if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) + return; + + sequence = cpu_to_be32(sequence); + addr = kmap_atomic(page, KM_USER0); + crc = jbd2_chksum(j, j->j_uuid_crc, (__u8 *)&sequence, + sizeof(sequence)); + crc = jbd2_chksum(j, crc, addr + offset_in_page(bh->b_data), + bh->b_size); + kunmap_atomic(addr, KM_USER0); + + tag->t_checksum = cpu_to_be32(crc); +} /* * jbd2_journal_commit_transaction * @@ -649,6 +669,8 @@ void jbd2_journal_commit_transaction(journal_t *journal) tag = (journal_block_tag_t *) tagp; write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); tag->t_flags = cpu_to_be32(tag_flag); + jbd2_block_tag_csum_set(journal, tag, jh2bh(new_jh), + commit_transaction->t_tid); tagp += tag_bytes; space_left -= tag_bytes; diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index d494c14..24a0241 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1981,10 +1981,16 @@ int jbd2_journal_blocks_per_page(struct inode *inode) */ size_t journal_tag_bytes(journal_t *journal) { + journal_block_tag_t tag; + size_t x = 0; + + if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) + x += sizeof(tag.t_checksum); + if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) - return JBD2_TAG_SIZE64; + return x + JBD2_TAG_SIZE64; else - return JBD2_TAG_SIZE32; + return x + JBD2_TAG_SIZE32; } /* diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c index 3db9625..ec315ba 100644 --- a/fs/jbd2/recovery.c +++ b/fs/jbd2/recovery.c @@ -390,6 +390,23 @@ static int jbd2_commit_block_csum_verify(journal_t *j, void *buf) return provided == calculated; } +static int jbd2_block_tag_csum_verify(journal_t *j, journal_block_tag_t *tag, + void *buf, __u32 sequence) +{ + __u32 provided, calculated; + + if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) + return 1; + + sequence = cpu_to_be32(sequence); + calculated = jbd2_chksum(j, j->j_uuid_crc, (__u8 *)&sequence, + sizeof(sequence)); + calculated = jbd2_chksum(j, calculated, buf, j->j_blocksize); + provided = be32_to_cpu(tag->t_checksum); + + return provided == cpu_to_be32(calculated); +} + static int do_one_pass(journal_t *journal, struct recovery_info *info, enum passtype pass) { @@ -566,6 +583,19 @@ static int do_one_pass(journal_t *journal, goto skip_write; } + /* Look for block corruption */ + if (!jbd2_block_tag_csum_verify( + journal, tag, obh->b_data, + be32_to_cpu(tmp->h_sequence))) { + brelse(obh); + success = -EIO; + printk(KERN_ERR "JBD: Invalid " + "checksum recovering " + "block %llu in log\n", + blocknr); + continue; + } + /* Find a buffer for the new * data being restored */ nbh = __getblk(journal->j_fs_dev, diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index 633fea2..098b30b 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -190,6 +190,7 @@ typedef struct journal_block_tag_s __be32 t_blocknr; /* The on-disk block number */ __be32 t_flags; /* See below */ __be32 t_blocknr_high; /* most-significant high 32bits. */ + __be32 t_checksum; /* crc32c(uuid+seq+block) */ } journal_block_tag_t; #define JBD2_TAG_SIZE32 (offsetof(journal_block_tag_t, t_blocknr_high))