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qemu-io: Use BlockBackend

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qemu-io should behave like a guest, therefore it should use BlockBackend
to access the block layer.

There are a couple of places where that is infeasible: First, the
bdrv_debug_* functions could theoretically be mirrored in the
BlockBackend, but since these are functions internal to the block layer,
they should not be visible externally (qemu-io as a test tool is exempt
from this).

Second, bdrv_get_info() and bdrv_get_specific_info() work on a single
BDS alone, therefore they should stay BDS-specific.

Third, bdrv_is_allocated() mainly works on a single BDS as well. Some
data may be passed through from the BDS's file (if sectors which are
apparently allocated in the file are not really allocated there but just
zero).

[Fixed conflicts around block_acct_start() usage from Fam Zheng's
"qemu-io: Account IO by aio_read and aio_write" commit.  Use
BlockBackend and blk_get_stats() instead of BlockDriverState.
--Stefan]

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1423162705-32065-14-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Max Reitz 2015-02-05 13:58:22 -05:00 • committed by Stefan Hajnoczi
parent 10d9d75ce4
commit 4c7b7e9b94
4 changed files with 146 additions and 135 deletions
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4
include/qemu-io.h
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@ -22,7 +22,7 @@
#define CMD_FLAG_GLOBAL ((int)0x80000000) /* don't iterate "args" */
typedef int (*cfunc_t)(BlockDriverState *bs, int argc, char **argv);
typedef int (*cfunc_t)(BlockBackend *blk, int argc, char **argv);
typedef void (*helpfunc_t)(void);
typedef struct cmdinfo {
@ -40,7 +40,7 @@ typedef struct cmdinfo {
extern bool qemuio_misalign;
bool qemuio_command(BlockDriverState *bs, const char *cmd);
bool qemuio_command(BlockBackend *blk, const char *cmd);
void qemuio_add_command(const cmdinfo_t *ci);
int qemuio_command_usage(const cmdinfo_t *ci);