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: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 81e6226..28d05bd 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -805,10 +805,13 @@
* 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 @@
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");