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Add flag to indicate external users to block device

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Certain operations such as drive_del or resize cannot be performed
while external users (eg. block migration) reference the block device.

Add a flag to indicate that.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Marcelo Tosatti 2011-01-26 12:12:34 -02:00 committed by Kevin Wolf
parent f48905d44f
commit db593f2565
3 changed files with 14 additions and 0 deletions
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11
block.c
View File

@ -2774,6 +2774,17 @@ int64_t bdrv_get_dirty_count(BlockDriverState *bs)
return bs->dirty_count;
}
void bdrv_set_in_use(BlockDriverState *bs, int in_use)
{
assert(bs->in_use != in_use);
bs->in_use = in_use;
}
int bdrv_in_use(BlockDriverState *bs)
{
return bs->in_use;
}
int bdrv_img_create(const char *filename, const char *fmt,
const char *base_filename, const char *base_fmt,
char *options, uint64_t img_size, int flags)

2
block.h
View File

@ -241,6 +241,8 @@ void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
int nr_sectors);
int64_t bdrv_get_dirty_count(BlockDriverState *bs);
void bdrv_set_in_use(BlockDriverState *bs, int in_use);
int bdrv_in_use(BlockDriverState *bs);
typedef enum {
BLKDBG_L1_UPDATE,

1
block_int.h
View File

@ -199,6 +199,7 @@ struct BlockDriverState {
char device_name[32];
unsigned long *dirty_bitmap;
int64_t dirty_count;
int in_use; /* users other than guest access, eg. block migration */
QTAILQ_ENTRY(BlockDriverState) list;
void *private;
};