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block: Drop unused .bdrv_has_zero_init_truncate

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Now that there are no clients of bdrv_has_zero_init_truncate, none of
the drivers need to worry about providing it.

What's more, this eliminates a source of some confusion: a literal
reading of the documentation as written in ceaca56f and implemented in
commit 1dcaf527 claims that a driver which returns 0 for
bdrv_has_zero_init_truncate() must not return 1 for
bdrv_has_zero_init(); this condition was violated for parallels, qcow,
and sometimes for vdi, although in practice it did not matter since
those drivers also lacked .bdrv_co_truncate.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200428202905.770727-10-eblake@redhat.com>
Acked-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2020-04-28 15:29:05 -05:00 committed by Kevin Wolf
parent dbc636e791
commit 47e0b38a13
12 changed files with 0 additions and 45 deletions
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21
block.c
View file

@ -5284,27 +5284,6 @@ int bdrv_has_zero_init(BlockDriverState *bs)
return 0;
}
int bdrv_has_zero_init_truncate(BlockDriverState *bs)
{
if (!bs->drv) {
return 0;
}
if (bs->backing) {
/* Depends on the backing image length, but better safe than sorry */
return 0;
}
if (bs->drv->bdrv_has_zero_init_truncate) {
return bs->drv->bdrv_has_zero_init_truncate(bs);
}
if (bs->file && bs->drv->is_filter) {
return bdrv_has_zero_init_truncate(bs->file->bs);
}
/* safe default */
return 0;
}
bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs)
{
BlockDriverInfo bdi;

1
block/file-posix.c
View file

@ -3100,7 +3100,6 @@ BlockDriver bdrv_file = {
.bdrv_co_create = raw_co_create,
.bdrv_co_create_opts = raw_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_co_block_status = raw_co_block_status,
.bdrv_co_invalidate_cache = raw_co_invalidate_cache,
.bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes,

1
block/file-win32.c
View file

@ -641,7 +641,6 @@ BlockDriver bdrv_file = {
.bdrv_close = raw_close,
.bdrv_co_create_opts = raw_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_aio_preadv = raw_aio_preadv,
.bdrv_aio_pwritev = raw_aio_pwritev,

1
block/nfs.c
View file

@ -872,7 +872,6 @@ static BlockDriver bdrv_nfs = {
.create_opts = &nfs_create_opts,
.bdrv_has_zero_init = nfs_has_zero_init,
.bdrv_has_zero_init_truncate = nfs_has_zero_init,
.bdrv_get_allocated_file_size = nfs_get_allocated_file_size,
.bdrv_co_truncate = nfs_file_co_truncate,

1
block/qcow2.c
View file

@ -5621,7 +5621,6 @@ BlockDriver bdrv_qcow2 = {
.bdrv_co_create_opts = qcow2_co_create_opts,
.bdrv_co_create = qcow2_co_create,
.bdrv_has_zero_init = qcow2_has_zero_init,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_co_block_status = qcow2_co_block_status,
.bdrv_co_preadv_part = qcow2_co_preadv_part,

1
block/qed.c
View file

@ -1675,7 +1675,6 @@ static BlockDriver bdrv_qed = {
.bdrv_co_create = bdrv_qed_co_create,
.bdrv_co_create_opts = bdrv_qed_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_co_block_status = bdrv_qed_co_block_status,
.bdrv_co_readv = bdrv_qed_co_readv,
.bdrv_co_writev = bdrv_qed_co_writev,

6
block/raw-format.c
View file

@ -414,11 +414,6 @@ static int raw_has_zero_init(BlockDriverState *bs)
return bdrv_has_zero_init(bs->file->bs);
}
static int raw_has_zero_init_truncate(BlockDriverState *bs)
{
return bdrv_has_zero_init_truncate(bs->file->bs);
}
static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
const char *filename,
QemuOpts *opts,
@ -582,7 +577,6 @@ BlockDriver bdrv_raw = {
.bdrv_co_ioctl = &raw_co_ioctl,
.create_opts = &raw_create_opts,
.bdrv_has_zero_init = &raw_has_zero_init,
.bdrv_has_zero_init_truncate = &raw_has_zero_init_truncate,
.strong_runtime_opts = raw_strong_runtime_opts,
.mutable_opts = mutable_opts,
};

1
block/rbd.c
View file

@ -1313,7 +1313,6 @@ static BlockDriver bdrv_rbd = {
.bdrv_co_create = qemu_rbd_co_create,
.bdrv_co_create_opts = qemu_rbd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_get_info = qemu_rbd_getinfo,
.create_opts = &qemu_rbd_create_opts,
.bdrv_getlength = qemu_rbd_getlength,

3
block/sheepdog.c
View file

@ -3226,7 +3226,6 @@ static BlockDriver bdrv_sheepdog = {
.bdrv_co_create = sd_co_create,
.bdrv_co_create_opts = sd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_getlength = sd_getlength,
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
.bdrv_co_truncate = sd_co_truncate,
@ -3265,7 +3264,6 @@ static BlockDriver bdrv_sheepdog_tcp = {
.bdrv_co_create = sd_co_create,
.bdrv_co_create_opts = sd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_getlength = sd_getlength,
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
.bdrv_co_truncate = sd_co_truncate,
@ -3304,7 +3302,6 @@ static BlockDriver bdrv_sheepdog_unix = {
.bdrv_co_create = sd_co_create,
.bdrv_co_create_opts = sd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
.bdrv_getlength = sd_getlength,
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
.bdrv_co_truncate = sd_co_truncate,

1
block/ssh.c
View file

@ -1397,7 +1397,6 @@ static BlockDriver bdrv_ssh = {
.bdrv_co_create_opts = ssh_co_create_opts,
.bdrv_close = ssh_close,
.bdrv_has_zero_init = ssh_has_zero_init,
.bdrv_has_zero_init_truncate = ssh_has_zero_init,
.bdrv_co_readv = ssh_co_readv,
.bdrv_co_writev = ssh_co_writev,
.bdrv_getlength = ssh_getlength,

1
include/block/block.h
View file

@ -430,7 +430,6 @@ int bdrv_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes);
int bdrv_co_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes);
int bdrv_has_zero_init_1(BlockDriverState *bs);
int bdrv_has_zero_init(BlockDriverState *bs);
int bdrv_has_zero_init_truncate(BlockDriverState *bs);
bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
int bdrv_block_status(BlockDriverState *bs, int64_t offset,

7
include/block/block_int.h
View file

@ -449,16 +449,9 @@ struct BlockDriver {
/*
* Returns 1 if newly created images are guaranteed to contain only
* zeros, 0 otherwise.
* Must return 0 if .bdrv_has_zero_init_truncate() returns 0.
*/
int (*bdrv_has_zero_init)(BlockDriverState *bs);
/*
* Returns 1 if new areas added by growing the image with
* PREALLOC_MODE_OFF contain only zeros, 0 otherwise.
*/
int (*bdrv_has_zero_init_truncate)(BlockDriverState *bs);
/* Remove fd handlers, timers, and other event loop callbacks so the event
* loop is no longer in use. Called with no in-flight requests and in
* depth-first traversal order with parents before child nodes.