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dm: storage: support cache mode toggling

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1. support "writeback" and "writethru" mode toggling for virtio-blk
conditionally. When starting DM with "writethru" parameter in
virtio-blk, guest OS could not toggle cache mode. When starting DM
with "writeback" parameter in virtio-blk, guest OS could toggle
cache mode.

    ------------------------------
    DM cmdline  | toggle support
    ------------+-----------------
    writeback   | yes
    writethru   | no
    ------------------------------

2. To toggle cache mode, run below command in guest OS:

    echo "write back" > /sys/devices/xxx/vdx/cache_type
OR
    echo "write through" > /sys/devices/xxx/vdx/cache_type

Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Reviewed-by: Shuo Liu <shuo.a.liu@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>
This commit is contained in:
Conghui Chen
2018-08-09 09:50:37 +08:00
committed by lijinxia
parent f4fcf5d6eb
commit 49322ac002
3 changed files with 77 additions and 4 deletions
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26
devicemodel/hw/block_if.c
View File

@@ -951,3 +951,29 @@ blockif_candelete(struct blockif_ctxt *bc)
assert(bc->magic == BLOCKIF_SIG);
return bc->candelete;
}
uint8_t
blockif_get_wce(struct blockif_ctxt *bc)
{
assert(bc->magic == BLOCKIF_SIG);
return bc->wce;
}
void
blockif_set_wce(struct blockif_ctxt *bc, uint8_t wce)
{
assert(bc->magic == BLOCKIF_SIG);
bc->wce = wce;
}
int
blockif_flush_all(struct blockif_ctxt *bc)
{
int err;
err=0;
assert(bc->magic == BLOCKIF_SIG);
if (fsync(bc->fd))
err = errno;
return err;
}