byte units if the
VIRTIO_BLK_F_WRITE_ZEROES feature bit is negotiated.
Signed-off-by: Changpeng Liu
---
CHANGELOG:
v6: don't set T_OUT bit to discard and write zeroes commands.
v5: use new block layer API: blk_queue_flag_set.
v4: several optimizations based on MST's comments, remove bit field usage for
command desc
byte units if the
VIRTIO_BLK_F_WRITE_ZEROES feature bit is negotiated.
Signed-off-by: Changpeng Liu
---
CHANGELOG:
v5: use new block layer API: blk_queue_flag_set.
v4: several optimizations based on MST's comments, remove bit field usage for
command descriptor.
v3: define the virtio-blk protocol to add discard
byte units if the
VIRTIO_BLK_F_WRITE_ZEROES feature bit is negotiated.
Signed-off-by: Changpeng Liu
---
CHANGELOG:
v5: use new block layer API: blk_queue_flag_set.
v4: several optimizations based on MST's comments, remove bit field usage for
command descriptor.
v3: define the virtio-blk protocol to add discard
byte units if the
VIRTIO_BLK_F_WRITE_ZEROES feature bit is negotiated.
Signed-off-by: Changpeng Liu
---
CHANGELOG:
v4: several optimizations based on MST's comments, remove bit field usage for
command descriptor.
v3: define the virtio-blk protocol to add discard and write zeroes support,
first version implementa
commands.
The specification change list here:
https://github.com/oasis-tcs/virtio-spec
CHANGELOG:
v3: finalized the specification change.
Signed-off-by: Changpeng Liu <changpeng@intel.com>
---
drivers/block/virtio_blk.c | 96 +++--
include/uapi
VIRTIO_BLK_T_DISCARD
to extend exist virtio-blk protocol, define 16 bytes discard descriptor
for each discard segment, the discard segment defination aligns with
SCSI or NVM Express protocols, virtio-blk driver will support multi-range
discard request as well.
Signed-off-by: Changpeng Liu <changp
VIRTIO_BLK_T_DISCARD
to extend exist virtio-blk protocol. virtio-blk protocol uses a single
8 bytes descriptor containing type,reserved and sector, currently Linux
uses the reserved field as IO priority, here we also re-use the reserved
field as number of discard sectors.
Signed-off-by: Changpeng Liu
Currently virtio_blk driver does not provide discard feature
flag, so the filesystems which built on top of the block device
will not send discard command. This is okay for HDD backend, but
it will impact the performance for SSD backend.
Add a feature flag such as VIRTIO_BLK_F_DISCARD to
Currently virtio_blk driver does not provide discard feature
flag, so the filesystems which built on top of the block device
will not send discard command. This is okay for HDD backend, but
it will impact the performance for SSD backend.
Add a feature flag such as VIRTIO_BLK_F_DISCARD to
