From: Christoph Hellwig <hch@lst.de>
To: Shaohua Li <shli@fb.com>, neilb@suse.de
Cc: linux-raid@vger.kernel.org, Kernel-team@fb.com, dan.j.williams@intel.com
Subject: [PATCH 10/12] raid5-cache: new helper: r5_reserve_log_entry
Date: Sat, 12 Sep 2015 08:17:16 +0200 [thread overview]
Message-ID: <1442038638-6947-11-git-send-email-hch@lst.de> (raw)
In-Reply-To: <1442038638-6947-1-git-send-email-hch@lst.de>
Factor out code to reserve log space.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/md/raid5-cache.c | 30 +++++++++++++++++++-----------
1 file changed, 19 insertions(+), 11 deletions(-)
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 82a9d32..7d9fa29 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -269,6 +269,23 @@ 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;
@@ -297,11 +314,7 @@ 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);
@@ -354,13 +367,8 @@ alloc_bio:
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,
--
1.9.1
next prev parent reply other threads:[~2015-09-12 6:17 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-12 6:17 raid5-cache I/O path improvements V2 Christoph Hellwig
2015-09-12 6:17 ` [PATCH 01/12] raid5-cache: port to 4.3-rc Christoph Hellwig
2015-09-12 6:17 ` [PATCH 02/12] raid5-cache: free I/O units earlier Christoph Hellwig
2015-09-15 7:00 ` Neil Brown
2015-09-17 1:50 ` Christoph Hellwig
2015-09-15 8:07 ` Neil Brown
2015-09-17 1:48 ` Christoph Hellwig
2015-09-12 6:17 ` [PATCH 03/12] raid5-cache: rename flushed_ios to finished_ios Christoph Hellwig
2015-09-12 6:17 ` [PATCH 04/12] raid5-cache: factor out a helper to run all stripes for an I/O unit Christoph Hellwig
2015-09-12 6:17 ` [PATCH 05/12] raid5-cache: use FUA writes for the log Christoph Hellwig
2015-09-12 6:17 ` [PATCH 06/12] raid5-cache: clean up r5l_get_meta Christoph Hellwig
2015-09-12 6:17 ` [PATCH 07/12] raid5-cache: refactor bio allocation Christoph Hellwig
2015-09-12 6:17 ` [PATCH 08/12] raid5-cache: take rdev->data_offset into account early on Christoph Hellwig
2015-09-12 6:17 ` [PATCH 09/12] raid5-cache: inline r5l_alloc_io_unit into r5l_new_meta Christoph Hellwig
2015-09-12 6:17 ` Christoph Hellwig [this message]
2015-09-12 6:17 ` [PATCH 11/12] raid5-cache: small log->seq cleanup Christoph Hellwig
2015-09-12 6:17 ` [PATCH 12/12] raid5-cache: use bio chaining Christoph Hellwig
2015-09-14 19:11 ` raid5-cache I/O path improvements V2 Shaohua Li
2015-09-15 7:23 ` Neil Brown
2015-09-15 21:54 ` Shaohua Li
2015-09-17 1:53 ` Christoph Hellwig
2015-09-28 14:01 ` Christoph Hellwig
2015-09-30 5:39 ` Neil Brown
2015-09-30 15:00 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1442038638-6947-11-git-send-email-hch@lst.de \
--to=hch@lst.de \
--cc=Kernel-team@fb.com \
--cc=dan.j.williams@intel.com \
--cc=linux-raid@vger.kernel.org \
--cc=neilb@suse.de \
--cc=shli@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).