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[Qemu-devel] [PATCH for 1.2 4/4] iscsi: Set number of blocks to 0 for bl
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH for 1.2 4/4] iscsi: Set number of blocks to 0 for blank CDROM devices |
Date: |
Tue, 28 Aug 2012 14:52:19 +0200 |
From: Ronnie Sahlberg <address@hidden>
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 file modificato, 6 inserzioni(+). 1 rimozione(-)
diff --git a/block/iscsi.c b/block/iscsi.c
index 4828b83..0b96165 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -721,7 +721,12 @@ 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 ;
--
1.7.11.2