[PATCH 2/5] block: add ioctl to read the disk sequence number
From: Matteo Croce <hidden>
Date: 2021-02-06 03:05:34
Also in:
linux-fsdevel, lkml
Subsystem:
block layer, filesystems (vfs and infrastructure), the rest · Maintainers:
Jens Axboe, Alexander Viro, Christian Brauner, Linus Torvalds
From: Matteo Croce <redacted> Add a new BLKGETDISKSEQ ioctl which retrieves the disk sequence number from the genhd structure. Signed-off-by: Matteo Croce <redacted> --- 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 d61d652078f4..037fec888098 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c@@ -460,6 +460,8 @@ 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 f44eb0a04afd..5dc72bbdd9b7 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: 130-131 are reserved for zoned block devices * (see uapi/linux/blkzoned.h)
--
2.29.2