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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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1
block/nfs.c
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@ -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,