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jbd2: factor out common descriptor block initialization

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Descriptor block header is initialized in several places. Factor out the
common code into jbd2_journal_get_descriptor_buffer().

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2016-02-22 23:17:15 -05:00 committed by Theodore Ts'o
parent 9bcf976cb8
commit 32ab671599
4 changed files with 16 additions and 19 deletions
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16
fs/jbd2/commit.c
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@ -131,14 +131,12 @@ static int journal_submit_commit_record(journal_t *journal,
if (is_journal_aborted(journal))
return 0;
bh = jbd2_journal_get_descriptor_buffer(journal);
bh = jbd2_journal_get_descriptor_buffer(commit_transaction,
JBD2_COMMIT_BLOCK);
if (!bh)
return 1;
tmp = (struct commit_header *)bh->b_data;
tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK);
tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid);
tmp->h_commit_sec = cpu_to_be64(now.tv_sec);
tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec);
@ -379,7 +377,6 @@ void jbd2_journal_commit_transaction(journal_t *journal)
ktime_t start_time;
u64 commit_time;
char *tagp = NULL;
journal_header_t *header;
journal_block_tag_t *tag = NULL;
int space_left = 0;
int first_tag = 0;
@ -615,7 +612,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
jbd_debug(4, "JBD2: get descriptor\n");
descriptor = jbd2_journal_get_descriptor_buffer(journal);
descriptor = jbd2_journal_get_descriptor_buffer(
commit_transaction,
JBD2_DESCRIPTOR_BLOCK);
if (!descriptor) {
jbd2_journal_abort(journal, -EIO);
continue;
@ -624,11 +623,6 @@ void jbd2_journal_commit_transaction(journal_t *journal)
jbd_debug(4, "JBD2: got buffer %llu (%p)\n",
(unsigned long long)descriptor->b_blocknr,
descriptor->b_data);
header = (journal_header_t *)descriptor->b_data;
header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK);
header->h_sequence = cpu_to_be32(commit_transaction->t_tid);
tagp = &descriptor->b_data[sizeof(journal_header_t)];
space_left = descriptor->b_size -
sizeof(journal_header_t);

9
fs/jbd2/journal.c
View File

@ -805,10 +805,13 @@ int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr,
* But we don't bother doing that, so there will be coherency problems with
* mmaps of blockdevs which hold live JBD-controlled filesystems.
*/
struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal)
struct buffer_head *
jbd2_journal_get_descriptor_buffer(transaction_t *transaction, int type)
{
journal_t *journal = transaction->t_journal;
struct buffer_head *bh;
unsigned long long blocknr;
journal_header_t *header;
int err;
err = jbd2_journal_next_log_block(journal, &blocknr);
@ -821,6 +824,10 @@ struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal)
return NULL;
lock_buffer(bh);
memset(bh->b_data, 0, journal->j_blocksize);
header = (journal_header_t *)bh->b_data;
header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
header->h_blocktype = cpu_to_be32(type);
header->h_sequence = cpu_to_be32(transaction->t_tid);
set_buffer_uptodate(bh);
unlock_buffer(bh);
BUFFER_TRACE(bh, "return this buffer");

8
fs/jbd2/revoke.c
View File

@ -570,7 +570,6 @@ static void write_one_revoke_record(transaction_t *transaction,
int csum_size = 0;
struct buffer_head *descriptor;
int sz, offset;
journal_header_t *header;
/* If we are already aborting, this all becomes a noop. We
still need to go round the loop in
@ -600,13 +599,10 @@ static void write_one_revoke_record(transaction_t *transaction,
}
if (!descriptor) {
descriptor = jbd2_journal_get_descriptor_buffer(journal);
descriptor = jbd2_journal_get_descriptor_buffer(transaction,
JBD2_REVOKE_BLOCK);
if (!descriptor)
return;
header = (journal_header_t *)descriptor->b_data;
header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
header->h_blocktype = cpu_to_be32(JBD2_REVOKE_BLOCK);
header->h_sequence = cpu_to_be32(transaction->t_tid);
/* Record it so that we can wait for IO completion later */
BUFFER_TRACE(descriptor, "file in log_bufs");

2
include/linux/jbd2.h
View File

@ -1137,7 +1137,7 @@ static inline void jbd2_unfile_log_bh(struct buffer_head *bh)
}
/* Log buffer allocation */
struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal);
struct buffer_head *jbd2_journal_get_descriptor_buffer(transaction_t *, int);
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);