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dm: storage: add read-only feature for virtio-blk 

Add VIRTIO_BLK_F_RO feature bit for virtio-blk.

Tracked-On: #2887
Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Conghui Chen 2019-04-04 06:02:21 +08:00 committed by Eddie Dong
parent f4f9970623
commit ede5987c11
1 changed files with 10 additions and 0 deletions
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10
devicemodel/hw/pci/virtio/virtio_block.c
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@ -51,6 +51,7 @@
/* Capability bits */
#define VIRTIO_BLK_F_SEG_MAX (1 << 2) /* Maximum request segments */
#define VIRTIO_BLK_F_RO (1 << 5) /* Device is read-only */
#define VIRTIO_BLK_F_BLK_SIZE (1 << 6) /* cfg block size valid */
#define VIRTIO_BLK_F_FLUSH (1 << 9) /* Cache flush support */
#define VIRTIO_BLK_F_TOPOLOGY (1 << 10) /* Optimal I/O alignment */
@ -249,6 +250,12 @@ virtio_blk_proc(struct virtio_blk *blk, struct virtio_vq_info *vq)
writeop = ((type == VBH_OP_WRITE) ||
(type == VBH_OP_DISCARD));
if (writeop && blockif_is_ro(blk->bc)) {
WPRINTF(("Cannot write to a read-only storage!\n"));
virtio_blk_done(&io->req, EROFS);
return;
}
iolen = 0;
for (i = 1; i < n; i++) {
/*
@ -335,6 +342,9 @@ virtio_blk_get_caps(struct virtio_blk *blk, bool wb)
if (blockif_candiscard(blk->bc))
caps |= VIRTIO_BLK_F_DISCARD;
if (blockif_is_ro(blk->bc))
caps |= VIRTIO_BLK_F_RO;
return caps;
}