From: Matteo Croce <mcroce@linux.microsoft.com>
To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Jens Axboe <axboe@kernel.dk>
Cc: linux-kernel@vger.kernel.org,
"Lennart Poettering" <lennart@poettering.net>,
"Luca Boccassi" <bluca@debian.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Damien Le Moal" <damien.lemoal@wdc.com>,
"Tejun Heo" <tj@kernel.org>,
"Javier González" <javier@javigon.com>,
"Niklas Cassel" <niklas.cassel@wdc.com>,
"Johannes Thumshirn" <johannes.thumshirn@wdc.com>,
"Hannes Reinecke" <hare@suse.de>,
"Matthew Wilcox" <willy@infradead.org>,
"Christoph Hellwig" <hch@infradead.org>,
JeffleXu <jefflexu@linux.alibaba.com>
Subject: [PATCH v4 3/5] block: add ioctl to read the disk sequence number
Date: Sun, 11 Jul 2021 19:54:13 +0200 [thread overview]
Message-ID: <20210711175415.80173-4-mcroce@linux.microsoft.com> (raw)
In-Reply-To: <20210711175415.80173-1-mcroce@linux.microsoft.com>
From: Matteo Croce <mcroce@microsoft.com>
Add a new BLKGETDISKSEQ ioctl which retrieves the disk sequence number
from the genhd structure.
# ./getdiskseq /dev/loop*
/dev/loop0: 13
/dev/loop0p1: 13
/dev/loop0p2: 13
/dev/loop0p3: 13
/dev/loop1: 14
/dev/loop1p1: 14
/dev/loop1p2: 14
/dev/loop2: 5
/dev/loop3: 6
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
---
block/ioctl.c | 2 ++
include/uapi/linux/fs.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/block/ioctl.c b/block/ioctl.c
index 24beec9ca9c9..0c3a4a53fa11 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -469,6 +469,8 @@ static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
BLKDEV_DISCARD_SECURE);
case BLKZEROOUT:
return blk_ioctl_zeroout(bdev, mode, arg);
+ case BLKGETDISKSEQ:
+ return put_u64(argp, bdev->bd_disk->diskseq);
case BLKREPORTZONE:
return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
case BLKRESETZONE:
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 4c32e97dcdf0..bdf7b404b3e7 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -184,6 +184,7 @@ struct fsxattr {
#define BLKSECDISCARD _IO(0x12,125)
#define BLKROTATIONAL _IO(0x12,126)
#define BLKZEROOUT _IO(0x12,127)
+#define BLKGETDISKSEQ _IOR(0x12,128,__u64)
/*
* A jump here: 130-136 are reserved for zoned block devices
* (see uapi/linux/blkzoned.h)
--
2.31.1
next prev parent reply other threads:[~2021-07-11 17:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-11 17:54 [PATCH v4 0/5] block: add a sequence number to disks Matteo Croce
2021-07-11 17:54 ` [PATCH v4 1/5] block: add disk sequence number Matteo Croce
2021-07-12 6:25 ` Christoph Hellwig
2021-07-11 17:54 ` [PATCH v4 2/5] block: export the diskseq in uevents Matteo Croce
2021-07-12 6:26 ` Christoph Hellwig
2021-07-11 17:54 ` Matteo Croce [this message]
2021-07-12 6:28 ` [PATCH v4 3/5] block: add ioctl to read the disk sequence number Christoph Hellwig
2021-07-12 19:22 ` Elliott, Robert (Servers)
2021-07-12 23:25 ` Matteo Croce
2021-07-13 5:59 ` Christoph Hellwig
2021-07-11 17:54 ` [PATCH v4 4/5] block: export diskseq in sysfs Matteo Croce
2021-07-12 6:29 ` Christoph Hellwig
2021-07-11 17:54 ` [PATCH v4 5/5] loop: raise media_change event Matteo Croce
2021-07-12 6:54 ` Christoph Hellwig
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