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Add bdrv_flush_all()

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This patch adds a bdrv_flush_all() function.  It's necessary to ensure that all
IO operations have been flushed to disk before completely a live migration.

N.B. we don't actually use this now.  We really should flush the block drivers
using an live savevm callback to avoid unnecessary guest down time.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5432 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-10-06 13:55:43 +00:00
parent d8f4460989
commit c6ca28d636
2 changed files with 12 additions and 0 deletions
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10
block.c
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@ -895,6 +895,16 @@ void bdrv_flush(BlockDriverState *bs)
bdrv_flush(bs->backing_hd); bdrv_flush(bs->backing_hd);
} }
void bdrv_flush_all(void)
{
BlockDriverState *bs;
for (bs = bdrv_first; bs != NULL; bs = bs->next)
if (bs->drv && !bdrv_is_read_only(bs) &&
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
bdrv_flush(bs);
}
/* /*
* Returns true iff the specified sector is present in the disk image. Drivers * Returns true iff the specified sector is present in the disk image. Drivers
* not implementing the functionality are assumed to not support backing files, * not implementing the functionality are assumed to not support backing files,

2
block.h
View File

@ -93,6 +93,8 @@ int qemu_key_check(BlockDriverState *bs, const char *name);
/* Ensure contents are flushed to disk. */ /* Ensure contents are flushed to disk. */
void bdrv_flush(BlockDriverState *bs); void bdrv_flush(BlockDriverState *bs);
void bdrv_flush_all(void);
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int *pnum); int *pnum);