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Date: Tue, 12 Jan 2016 13:41:01 +0100
From: Jan Kara <jack@...e.cz>
To: "Darrick J. Wong" <darrick.wong@...cle.com>
Cc: Jan Kara <jack@...e.cz>, Ted Tso <tytso@....edu>,
linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/4] jbd2: Unify revoke and tag block checksum handling
On Thu 07-01-16 09:16:45, Darrick J. Wong wrote:
> 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>
Thanks for review.
> Is there a corresponding update to e2fsprogs' journal code?
No, I can write one if Ted decides to merge this in JBD2.
Honza
> > 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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> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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