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Date: Thu, 7 Jan 2016 09:16:45 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: Jan Kara <jack@...e.cz>
Cc: Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/4] jbd2: Unify revoke and tag block checksum handling
On Thu, Jan 07, 2016 at 03:41:54PM +0100, Jan Kara wrote:
> Revoke and tag descriptor blocks are just different kinds of descriptor
> blocks and thus have checksum in the same place. Unify computation and
> checking of checksums for these.
Looks ok to me,
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
Is there a corresponding update to e2fsprogs' journal code?
--D
>
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
> fs/jbd2/commit.c | 18 +-----------------
> fs/jbd2/journal.c | 15 +++++++++++++++
> fs/jbd2/recovery.c | 31 +++++--------------------------
> fs/jbd2/revoke.c | 19 ++-----------------
> include/linux/jbd2.h | 8 ++------
> 5 files changed, 25 insertions(+), 66 deletions(-)
>
> diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
> index cf221f3d955a..ae832cd44dd8 100644
> --- a/fs/jbd2/commit.c
> +++ b/fs/jbd2/commit.c
> @@ -317,22 +317,6 @@ static void write_tag_block(journal_t *j, journal_block_tag_t *tag,
> tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1);
> }
>
> -static void jbd2_descr_block_csum_set(journal_t *j,
> - struct buffer_head *bh)
> -{
> - struct jbd2_journal_block_tail *tail;
> - __u32 csum;
> -
> - if (!jbd2_journal_has_csum_v2or3(j))
> - return;
> -
> - tail = (struct jbd2_journal_block_tail *)(bh->b_data + j->j_blocksize -
> - sizeof(struct jbd2_journal_block_tail));
> - tail->t_checksum = 0;
> - csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
> - tail->t_checksum = cpu_to_be32(csum);
> -}
> -
> static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
> struct buffer_head *bh, __u32 sequence)
> {
> @@ -714,7 +698,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
>
> tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG);
>
> - jbd2_descr_block_csum_set(journal, descriptor);
> + jbd2_descriptor_block_csum_set(journal, descriptor);
> start_journal_io:
> for (i = 0; i < bufs; i++) {
> struct buffer_head *bh = wbuf[i];
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 28d05bd9a588..defa962a8e15 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -834,6 +834,21 @@ jbd2_journal_get_descriptor_buffer(transaction_t *transaction, int type)
> return bh;
> }
>
> +void jbd2_descriptor_block_csum_set(journal_t *j, struct buffer_head *bh)
> +{
> + struct jbd2_journal_block_tail *tail;
> + __u32 csum;
> +
> + if (!jbd2_journal_has_csum_v2or3(j))
> + return;
> +
> + tail = (struct jbd2_journal_block_tail *)(bh->b_data + j->j_blocksize -
> + sizeof(struct jbd2_journal_block_tail));
> + tail->t_checksum = 0;
> + csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
> + tail->t_checksum = cpu_to_be32(csum);
> +}
> +
> /*
> * Return tid of the oldest transaction in the journal and block in the journal
> * where the transaction starts.
> diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
> index 7f277e49fe88..08a456b96e4e 100644
> --- a/fs/jbd2/recovery.c
> +++ b/fs/jbd2/recovery.c
> @@ -174,8 +174,7 @@ static int jread(struct buffer_head **bhp, journal_t *journal,
> return 0;
> }
>
> -static int jbd2_descr_block_csum_verify(journal_t *j,
> - void *buf)
> +static int jbd2_descriptor_block_csum_verify(journal_t *j, void *buf)
> {
> struct jbd2_journal_block_tail *tail;
> __be32 provided;
> @@ -522,8 +521,8 @@ static int do_one_pass(journal_t *journal,
> descr_csum_size =
> sizeof(struct jbd2_journal_block_tail);
> if (descr_csum_size > 0 &&
> - !jbd2_descr_block_csum_verify(journal,
> - bh->b_data)) {
> + !jbd2_descriptor_block_csum_verify(journal,
> + bh->b_data)) {
> printk(KERN_ERR "JBD2: Invalid checksum "
> "recovering block %lu in log\n",
> next_log_block);
> @@ -811,26 +810,6 @@ 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;
> - __be32 provided;
> - __u32 calculated;
> -
> - if (!jbd2_journal_has_csum_v2or3(j))
> - 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;
> -
> - return provided == cpu_to_be32(calculated);
> -}
> -
> /* Scan a revoke record, marking all blocks mentioned as revoked. */
>
> static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
> @@ -846,11 +825,11 @@ static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
> offset = sizeof(jbd2_journal_revoke_header_t);
> rcount = be32_to_cpu(header->r_count);
>
> - if (!jbd2_revoke_block_csum_verify(journal, header))
> + if (!jbd2_descriptor_block_csum_verify(journal, header))
> return -EFSBADCRC;
>
> if (jbd2_journal_has_csum_v2or3(journal))
> - csum_size = sizeof(struct jbd2_journal_revoke_tail);
> + csum_size = sizeof(struct jbd2_journal_block_tail);
> if (rcount > journal->j_blocksize - csum_size)
> return -EINVAL;
> max = rcount;
> diff --git a/fs/jbd2/revoke.c b/fs/jbd2/revoke.c
> index d1ebb1d41d17..91171dc352cb 100644
> --- a/fs/jbd2/revoke.c
> +++ b/fs/jbd2/revoke.c
> @@ -583,7 +583,7 @@ static void write_one_revoke_record(transaction_t *transaction,
>
> /* Do we need to leave space at the end for a checksum? */
> if (jbd2_journal_has_csum_v2or3(journal))
> - csum_size = sizeof(struct jbd2_journal_revoke_tail);
> + csum_size = sizeof(struct jbd2_journal_block_tail);
>
> if (jbd2_has_feature_64bit(journal))
> sz = 8;
> @@ -623,21 +623,6 @@ static void write_one_revoke_record(transaction_t *transaction,
> *offsetp = offset;
> }
>
> -static void jbd2_revoke_csum_set(journal_t *j, struct buffer_head *bh)
> -{
> - struct jbd2_journal_revoke_tail *tail;
> - __u32 csum;
> -
> - if (!jbd2_journal_has_csum_v2or3(j))
> - return;
> -
> - tail = (struct jbd2_journal_revoke_tail *)(bh->b_data + j->j_blocksize -
> - sizeof(struct jbd2_journal_revoke_tail));
> - tail->r_checksum = 0;
> - csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
> - tail->r_checksum = cpu_to_be32(csum);
> -}
> -
> /*
> * Flush a revoke descriptor out to the journal. If we are aborting,
> * this is a noop; otherwise we are generating a buffer which needs to
> @@ -658,7 +643,7 @@ static void flush_descriptor(journal_t *journal,
>
> header = (jbd2_journal_revoke_header_t *)descriptor->b_data;
> header->r_count = cpu_to_be32(offset);
> - jbd2_revoke_csum_set(journal, descriptor);
> + jbd2_descriptor_block_csum_set(journal, descriptor);
>
> set_buffer_jwrite(descriptor);
> BUFFER_TRACE(descriptor, "write");
> diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
> index 3649cb8d3a41..fd1083c46c61 100644
> --- a/include/linux/jbd2.h
> +++ b/include/linux/jbd2.h
> @@ -200,7 +200,7 @@ typedef struct journal_block_tag_s
> __be32 t_blocknr_high; /* most-significant high 32bits. */
> } journal_block_tag_t;
>
> -/* Tail of descriptor block, for checksumming */
> +/* Tail of descriptor or revoke block, for checksumming */
> struct jbd2_journal_block_tail {
> __be32 t_checksum; /* crc32c(uuid+descr_block) */
> };
> @@ -215,11 +215,6 @@ typedef struct jbd2_journal_revoke_header_s
> __be32 r_count; /* Count of bytes used in the block */
> } jbd2_journal_revoke_header_t;
>
> -/* Tail of revoke block, for checksumming */
> -struct jbd2_journal_revoke_tail {
> - __be32 r_checksum; /* crc32c(uuid+revoke_block) */
> -};
> -
> /* Definitions for the journal tag flags word: */
> #define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */
> #define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */
> @@ -1138,6 +1133,7 @@ static inline void jbd2_unfile_log_bh(struct buffer_head *bh)
>
> /* Log buffer allocation */
> struct buffer_head *jbd2_journal_get_descriptor_buffer(transaction_t *, int);
> +void jbd2_descriptor_block_csum_set(journal_t *, struct buffer_head *);
> int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
> int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid,
> unsigned long *block);
> --
> 2.6.2
>
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