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block: Add "file" output parameter to block status query functions

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The added parameter can be used to return the BDS pointer which the
valid offset is referring to. Its value should be ignored unless
BDRV_BLOCK_OFFSET_VALID in ret is set.

Until block drivers fill in the right value, let's clear it explicitly
right before calling .bdrv_get_block_status.

The "bs->file" condition in bdrv_co_get_block_status is kept now to keep iotest
case 102 passing, and will be fixed once all drivers return the right file
pointer.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1453780743-16806-2-git-send-email-famz@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Fam Zheng 2016-01-26 11:58:48 +08:00 • committed by Max Reitz
parent 1963f8d52e
commit 67a0fd2a9b
17 changed files with 66 additions and 35 deletions
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3
include/block/block_int.h
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@ -166,7 +166,8 @@ struct BlockDriver {
int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
int64_t sector_num, int nb_sectors);
int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum);
int64_t sector_num, int nb_sectors, int *pnum,
BlockDriverState **file);
/*
* Invalidate any cached meta-data.