From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>, Song Liu <song@kernel.org>
Cc: "Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
"Roger Pau Monné" <roger.pau@citrix.com>,
"Minchan Kim" <minchan@kernel.org>,
"Nitin Gupta" <ngupta@vflare.org>,
"Stefan Haberland" <sth@linux.ibm.com>,
"Jan Hoeppner" <hoeppner@linux.ibm.com>,
linux-block@vger.kernel.org, linux-raid@vger.kernel.org,
linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: [PATCH 7/8] block: factor out a part_devt helper
Date: Tue, 25 May 2021 08:13:00 +0200 [thread overview]
Message-ID: <20210525061301.2242282-8-hch@lst.de> (raw)
In-Reply-To: <20210525061301.2242282-1-hch@lst.de>
Add a helper to find the dev_t for a disk + partno tuple.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/genhd.c | 25 +++++++++++++++++--------
include/linux/genhd.h | 1 +
init/do_mounts.c | 10 ++--------
3 files changed, 20 insertions(+), 16 deletions(-)
diff --git a/block/genhd.c b/block/genhd.c
index 7c88c52c6589..e3de476797de 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1242,6 +1242,19 @@ static int __init proc_genhd_init(void)
module_init(proc_genhd_init);
#endif /* CONFIG_PROC_FS */
+dev_t part_devt(struct gendisk *disk, u8 partno)
+{
+ struct block_device *part = bdget_disk(disk, partno);
+ dev_t devt = 0;
+
+ if (part) {
+ devt = part->bd_dev;
+ bdput(part);
+ }
+
+ return devt;
+}
+
dev_t blk_lookup_devt(const char *name, int partno)
{
dev_t devt = MKDEV(0, 0);
@@ -1251,7 +1264,6 @@ dev_t blk_lookup_devt(const char *name, int partno)
class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
- struct block_device *part;
if (strcmp(dev_name(dev), name))
continue;
@@ -1262,13 +1274,10 @@ dev_t blk_lookup_devt(const char *name, int partno)
*/
devt = MKDEV(MAJOR(dev->devt),
MINOR(dev->devt) + partno);
- break;
- }
- part = bdget_disk(disk, partno);
- if (part) {
- devt = part->bd_dev;
- bdput(part);
- break;
+ } else {
+ devt = part_devt(disk, partno);
+ if (devt)
+ break;
}
}
class_dev_iter_exit(&iter);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index a093ec40c0a2..96d55cd06cf6 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -310,6 +310,7 @@ static inline void bd_unlink_disk_holder(struct block_device *bdev,
}
#endif /* CONFIG_SYSFS */
+dev_t part_devt(struct gendisk *disk, u8 partno);
dev_t blk_lookup_devt(const char *name, int partno);
void blk_request_module(dev_t devt);
#ifdef CONFIG_BLOCK
diff --git a/init/do_mounts.c b/init/do_mounts.c
index a78e44ee6adb..74aede860de7 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -133,14 +133,8 @@ static dev_t devt_from_partuuid(const char *uuid_str)
* Attempt to find the requested partition by adding an offset
* to the partition number found by UUID.
*/
- struct block_device *part;
-
- part = bdget_disk(dev_to_disk(dev),
- dev_to_bdev(dev)->bd_partno + offset);
- if (part) {
- devt = part->bd_dev;
- bdput(part);
- }
+ devt = part_devt(dev_to_disk(dev),
+ dev_to_bdev(dev)->bd_partno + offset);
} else {
devt = dev->devt;
}
--
2.30.2
next prev parent reply other threads:[~2021-05-25 6:13 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 6:12 move bd_mutex to the gendisk v2 Christoph Hellwig
2021-05-25 6:12 ` [PATCH 1/8] block: split __blkdev_get Christoph Hellwig
2021-05-25 8:04 ` Hannes Reinecke
2021-05-25 6:12 ` [PATCH 2/8] block: move sync_blockdev from __blkdev_put to blkdev_put Christoph Hellwig
2021-05-25 8:05 ` Hannes Reinecke
2021-05-25 6:12 ` [PATCH 3/8] block: move bd_mutex to struct gendisk Christoph Hellwig
2021-05-25 8:06 ` Hannes Reinecke
2021-05-26 1:06 ` Ming Lei
2021-05-28 7:27 ` Roger Pau Monné
2021-05-25 6:12 ` [PATCH 4/8] block: move adjusting bd_part_count out of __blkdev_get Christoph Hellwig
2021-05-25 8:18 ` Hannes Reinecke
2021-05-26 1:59 ` Ming Lei
2021-05-25 6:12 ` [PATCH 5/8] block: split __blkdev_put Christoph Hellwig
2021-05-25 8:19 ` Hannes Reinecke
2021-05-26 2:05 ` Ming Lei
2021-05-25 6:12 ` [PATCH 6/8] block: move bd_part_count to struct gendisk Christoph Hellwig
2021-05-25 8:20 ` Hannes Reinecke
2021-05-26 2:09 ` Ming Lei
2021-05-25 6:13 ` Christoph Hellwig [this message]
2021-05-25 8:25 ` [PATCH 7/8] block: factor out a part_devt helper Hannes Reinecke
2021-05-26 2:16 ` Ming Lei
2021-05-25 6:13 ` [PATCH 8/8] block: remove bdget_disk Christoph Hellwig
2021-05-25 8:26 ` Hannes Reinecke
2021-05-26 2:24 ` Ming Lei
2021-06-01 13:48 ` move bd_mutex to the gendisk v2 Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2021-05-12 6:18 move bd_mutex to the gendisk (resend) Christoph Hellwig
2021-05-12 6:18 ` [PATCH 7/8] block: factor out a part_devt helper 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=20210525061301.2242282-8-hch@lst.de \
--to=hch@lst.de \
--cc=axboe@kernel.dk \
--cc=hoeppner@linux.ibm.com \
--cc=konrad.wilk@oracle.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-raid@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=minchan@kernel.org \
--cc=ngupta@vflare.org \
--cc=roger.pau@citrix.com \
--cc=song@kernel.org \
--cc=sth@linux.ibm.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).