RE: [PATCH v4 3/5] block: add ioctl to read the disk sequence number
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From: Elliott, Robert (Servers) <hidden>
Date: 2021-07-12 19:23:27
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-----Original Message----- From: Matteo Croce <redacted> Sent: Sunday, July 11, 2021 12:54 PM
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Subject: [PATCH v4 3/5] block: add ioctl to read the disk sequence number From: Matteo Croce <redacted> Add a new BLKGETDISKSEQ ioctl which retrieves the disk sequence number from the genhd structure.
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Given:
static int put_u64(u64 __user *argp, u64 val)
{
return put_user(val, argp);
}
quoted hunk ↗ jump to hunk
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);
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+ case BLKGETDISKSEQ: + return put_u64(argp, bdev->bd_disk->diskseq);
How does that work on a system in which int is 32 bits?