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Commit 32ab6715 authored by Jan Kara's avatar Jan Kara Committed by Theodore Ts'o
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jbd2: factor out common descriptor block initialization 



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

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 9bcf976c

fs/jbd2/commit.c

+5 −11
Original line number Diff line number Diff line
@@ -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);

fs/jbd2/journal.c

+8 −1
Original line number Diff line number Diff line
@@ -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");

fs/jbd2/revoke.c

+2 −6
Original line number Diff line number Diff line
@@ -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");

include/linux/jbd2.h

+1 −1
Original line number Diff line number Diff line
@@ -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);