diff options
| author |   Matteo Croce <mcroce@microsoft.com> | 2021-07-13 01:05:27 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-08-02 13:37:28 -0600 |
| commit | 7957d93bf32bc211415827e44fdd9cdf1388df59 (patch) | |
| tree | 55e520657bdabf51a0a8428c2ab379bb640e576b | |
| parent | block: export the diskseq in uevents (diff) | |
| download | linux-dev-7957d93bf32bc211415827e44fdd9cdf1388df59.tar.xz linux-dev-7957d93bf32bc211415827e44fdd9cdf1388df59.zip | |
block: add ioctl to read the disk sequence number
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
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-4-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/ioctl.c | 2 | ||||
| -rw-r--r-- | include/uapi/linux/fs.h | 1 |
2 files changed, 3 insertions, 0 deletions
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) |