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Re: [Qemu-devel] [PATCH v3 07/29] block: rename buffer_alignment to gues
From: |
Benoît Canet |
Subject: |
Re: [Qemu-devel] [PATCH v3 07/29] block: rename buffer_alignment to guest_block_size |
Date: |
Tue, 21 Jan 2014 13:54:12 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Le Friday 17 Jan 2014 à 15:14:57 (+0100), Kevin Wolf a écrit :
> From: Paolo Bonzini <address@hidden>
>
> The alignment field is now set to the value that is promised to the
> guest, rather than required by the host. The next patches will make
> QEMU aware of the host-provided values, so make this clear.
>
> The alignment is also not about memory buffers, but about the sectors on
> the disk, change the documentation of the field.
>
> At this point, the field is set by the device emulation, but completely
> ignored by the block layer.
>
> Signed-off-by: Paolo Bonzini <address@hidden>
> Signed-off-by: Kevin Wolf <address@hidden>
> Reviewed-by: Wenchao Xia <address@hidden>
> Reviewed-by: Max Reitz <address@hidden>
> ---
> block.c | 10 +++++-----
> hw/block/virtio-blk.c | 2 +-
> hw/ide/core.c | 2 +-
> hw/scsi/scsi-disk.c | 2 +-
> hw/scsi/scsi-generic.c | 2 +-
> include/block/block.h | 2 +-
> include/block/block_int.h | 4 ++--
> 7 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/block.c b/block.c
> index 04c409a..b738abe 100644
> --- a/block.c
> +++ b/block.c
> @@ -812,7 +812,7 @@ static int bdrv_open_common(BlockDriverState *bs,
> BlockDriverState *file,
> }
>
> bs->open_flags = flags;
> - bs->buffer_alignment = 512;
> + bs->guest_block_size = 512;
> bs->zero_beyond_eof = true;
> open_flags = bdrv_open_flags(bs, flags);
> bs->read_only = !(open_flags & BDRV_O_RDWR);
> @@ -1648,7 +1648,7 @@ static void bdrv_move_feature_fields(BlockDriverState
> *bs_dest,
> bs_dest->dev_ops = bs_src->dev_ops;
> bs_dest->dev_opaque = bs_src->dev_opaque;
> bs_dest->dev = bs_src->dev;
> - bs_dest->buffer_alignment = bs_src->buffer_alignment;
> + bs_dest->guest_block_size = bs_src->guest_block_size;
> bs_dest->copy_on_read = bs_src->copy_on_read;
>
> bs_dest->enable_write_cache = bs_src->enable_write_cache;
> @@ -1800,7 +1800,7 @@ void bdrv_detach_dev(BlockDriverState *bs, void *dev)
> bs->dev = NULL;
> bs->dev_ops = NULL;
> bs->dev_opaque = NULL;
> - bs->buffer_alignment = 512;
> + bs->guest_block_size = 512;
> }
>
> /* TODO change to return DeviceState * when all users are qdevified */
> @@ -4561,9 +4561,9 @@ BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
> return NULL;
> }
>
> -void bdrv_set_buffer_alignment(BlockDriverState *bs, int align)
> +void bdrv_set_guest_block_size(BlockDriverState *bs, int align)
> {
> - bs->buffer_alignment = align;
> + bs->guest_block_size = align;
> }
>
> void *qemu_blockalign(BlockDriverState *bs, size_t size)
> diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> index 19d0961..8a568e5 100644
> --- a/hw/block/virtio-blk.c
> +++ b/hw/block/virtio-blk.c
> @@ -731,7 +731,7 @@ static void virtio_blk_device_realize(DeviceState *dev,
> Error **errp)
> register_savevm(dev, "virtio-blk", virtio_blk_id++, 2,
> virtio_blk_save, virtio_blk_load, s);
> bdrv_set_dev_ops(s->bs, &virtio_block_ops, s);
> - bdrv_set_buffer_alignment(s->bs, s->conf->logical_block_size);
> + bdrv_set_guest_block_size(s->bs, s->conf->logical_block_size);
>
> bdrv_iostatus_enable(s->bs);
>
> diff --git a/hw/ide/core.c b/hw/ide/core.c
> index e1f4c33..036cd4a 100644
> --- a/hw/ide/core.c
> +++ b/hw/ide/core.c
> @@ -2103,7 +2103,7 @@ int ide_init_drive(IDEState *s, BlockDriverState *bs,
> IDEDriveKind kind,
> s->smart_selftest_count = 0;
> if (kind == IDE_CD) {
> bdrv_set_dev_ops(bs, &ide_cd_block_ops, s);
> - bdrv_set_buffer_alignment(bs, 2048);
> + bdrv_set_guest_block_size(bs, 2048);
> } else {
> if (!bdrv_is_inserted(s->bs)) {
> error_report("Device needs media, but drive is empty");
> diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> index bce617c..6491091 100644
> --- a/hw/scsi/scsi-disk.c
> +++ b/hw/scsi/scsi-disk.c
> @@ -2254,7 +2254,7 @@ static int scsi_initfn(SCSIDevice *dev)
> } else {
> bdrv_set_dev_ops(s->qdev.conf.bs, &scsi_disk_block_ops, s);
> }
> - bdrv_set_buffer_alignment(s->qdev.conf.bs, s->qdev.blocksize);
> + bdrv_set_guest_block_size(s->qdev.conf.bs, s->qdev.blocksize);
>
> bdrv_iostatus_enable(s->qdev.conf.bs);
> add_boot_device_path(s->qdev.conf.bootindex, &dev->qdev, NULL);
> diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
> index 8f195be..f08b64e 100644
> --- a/hw/scsi/scsi-generic.c
> +++ b/hw/scsi/scsi-generic.c
> @@ -210,7 +210,7 @@ static void scsi_read_complete(void * opaque, int ret)
> s->blocksize = ldl_be_p(&r->buf[8]);
> s->max_lba = ldq_be_p(&r->buf[0]);
> }
> - bdrv_set_buffer_alignment(s->conf.bs, s->blocksize);
> + bdrv_set_guest_block_size(s->conf.bs, s->blocksize);
>
> scsi_req_data(&r->req, len);
> if (!r->req.io_canceled) {
> diff --git a/include/block/block.h b/include/block/block.h
> index cf63ee2..05252d5 100644
> --- a/include/block/block.h
> +++ b/include/block/block.h
> @@ -422,7 +422,7 @@ void bdrv_img_create(const char *filename, const char
> *fmt,
> /* Returns the alignment in bytes that is required so that no bounce buffer
> * is required throughout the stack */
> size_t bdrv_opt_mem_align(BlockDriverState *bs);
> -void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
> +void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
> void *qemu_blockalign(BlockDriverState *bs, size_t size);
> bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
>
> diff --git a/include/block/block_int.h b/include/block/block_int.h
> index a602e14..36c068f 100644
> --- a/include/block/block_int.h
> +++ b/include/block/block_int.h
> @@ -319,8 +319,8 @@ struct BlockDriverState {
> /* Whether produces zeros when read beyond eof */
> bool zero_beyond_eof;
>
> - /* the memory alignment required for the buffers handled by this driver
> */
> - int buffer_alignment;
> + /* the block size for which the guest device expects atomicity */
> + int guest_block_size;
>
> /* do we need to tell the quest if we have a volatile write cache? */
> int enable_write_cache;
> --
> 1.8.1.4
>
>
Reviewed-by: Benoit Canet <address@hidden>
- [Qemu-devel] [PATCH v3 06/29] block: Don't use guest sector size for qemu_blockalign(), (continued)
- [Qemu-devel] [PATCH v3 06/29] block: Don't use guest sector size for qemu_blockalign(), Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 08/29] raw: Probe required direct I/O alignment, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 09/29] block: Introduce bdrv_aligned_preadv(), Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 10/29] block: Introduce bdrv_co_do_preadv(), Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 07/29] block: rename buffer_alignment to guest_block_size, Kevin Wolf, 2014/01/17
- Re: [Qemu-devel] [PATCH v3 07/29] block: rename buffer_alignment to guest_block_size,
Benoît Canet <=
- [Qemu-devel] [PATCH v3 11/29] block: Introduce bdrv_aligned_pwritev(), Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 12/29] block: write: Handle COR dependency after I/O throttling, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 13/29] block: Introduce bdrv_co_do_pwritev(), Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 16/29] block: Make zero-after-EOF work with larger alignment, Kevin Wolf, 2014/01/17