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Commit c1b99198 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by NeilBrown
Browse files

raid5-cache: new helper: r5_reserve_log_entry 



Factor out code to reserve log space.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarShaohua Li <shli@fb.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
parent 51039cd0

drivers/md/raid5-cache.c

+19 −11
Original line number Diff line number Diff line
@@ -271,6 +271,23 @@ static struct bio *r5l_bio_alloc(struct r5l_log *log, struct r5l_io_unit *io) 
	return bio;

}



static void r5_reserve_log_entry(struct r5l_log *log, struct r5l_io_unit *io)

{

	log->log_start = r5l_ring_add(log, log->log_start, BLOCK_SECTORS);



	/*

	 * If we filled up the log device start from the beginning again,

	 * which will require a new bio.

	 *

	 * Note: for this to work properly the log size needs to me a multiple

	 * of BLOCK_SECTORS.

	 */

	if (log->log_start == 0)

		io->current_bio = NULL;



	io->log_end = log->log_start;

}



static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log)

{

	struct r5l_io_unit *io;
@@ -299,11 +316,7 @@ static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log) 
	bio_add_page(io->current_bio, io->meta_page, PAGE_SIZE, 0);



	log->seq++;

	log->log_start = r5l_ring_add(log, log->log_start, BLOCK_SECTORS);

	io->log_end = log->log_start;

	/* current bio hit disk end */

	if (log->log_start == 0)

		io->current_bio = NULL;

	r5_reserve_log_entry(log, io);



	spin_lock_irq(&log->io_list_lock);

	list_add_tail(&io->log_sibling, &log->running_ios);
@@ -357,13 +370,8 @@ static void r5l_append_payload_page(struct r5l_log *log, struct page *page) 
		io->current_bio = NULL;

		goto alloc_bio;

	}

	log->log_start = r5l_ring_add(log, log->log_start,

				      BLOCK_SECTORS);

	/* current bio hit disk end */

	if (log->log_start == 0)

		io->current_bio = NULL;



	io->log_end = log->log_start;

	r5_reserve_log_entry(log, io);

}



static void r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh,