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Re: [Qemu-devel] [PATCH 1/2] ISCSI: Set number of blocks to 0 for blank
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] ISCSI: Set number of blocks to 0 for blank CDROM devices |
Date: |
Sat, 18 Aug 2012 23:57:16 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 |
Il 17/08/2012 04:36, Ronnie Sahlberg ha scritto:
> The number of blocks of the device is used to compute the device size
> in bdrv_getlength()/iscsi_getlength().
> For MMC devices, the ReturnedLogicalBlockAddress in the READCAPACITY10
> has a special meaning when it is 0.
> In this case it does not mean that LBA 0 is the last accessible LBA,
> and thus the device has 1 readable block, but instead it means that the
> disc is blank and there are no readable blocks.
>
> This change ensures that when the iSCSI LUN is loaded with a blank
> DVD-R disk or similar that bdrv_getlength() will return the correct
> size of the device as 0 bytes.
>
> Signed-off-by: Ronnie Sahlberg <address@hidden>
> ---
> block/iscsi.c | 7 ++++++-
> 1 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/block/iscsi.c b/block/iscsi.c
> index bb9cf82..fb420ea 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -717,7 +717,12 @@ iscsi_readcapacity10_cb(struct iscsi_context *iscsi, int
> status,
> }
>
> itask->iscsilun->block_size = rc10->block_size;
> - itask->iscsilun->num_blocks = rc10->lba + 1;
> + if (rc10->lba == 0) {
> + /* blank disk loaded */
> + itask->iscsilun->num_blocks = 0;
> + } else {
> + itask->iscsilun->num_blocks = rc10->lba + 1;
> + }
> itask->bs->total_sectors = itask->iscsilun->num_blocks *
> itask->iscsilun->block_size /
> BDRV_SECTOR_SIZE ;
>
>
Thanks, applied to SCSI branch. We'll see whether this hits 1.2.
Paolo
- [Qemu-devel] [PATCH] Two trivial patches for iSCSI and blank DVDs, Ronnie Sahlberg, 2012/08/16
- [Qemu-devel] [PATCH 1/2] ISCSI: Set number of blocks to 0 for blank CDROM devices, Ronnie Sahlberg, 2012/08/16
- Re: [Qemu-devel] [PATCH 1/2] ISCSI: Set number of blocks to 0 for blank CDROM devices,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, Ronnie Sahlberg, 2012/08/16
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, Blue Swirl, 2012/08/18
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, Paolo Bonzini, 2012/08/18
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, ronnie sahlberg, 2012/08/18
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, ronnie sahlberg, 2012/08/18
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, Paolo Bonzini, 2012/08/18
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, ronnie sahlberg, 2012/08/18
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, Paolo Bonzini, 2012/08/18
- Re: [Qemu-devel] [PATCH 2/2] ISCSI: Force scsi-generic for MMC with blank disks, Paolo Bonzini, 2012/08/18