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block: Add PreallocMode to BD.bdrv_truncate()

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Add a PreallocMode parameter to the bdrv_truncate() function implemented
by each block driver. Currently, we always pass PREALLOC_MODE_OFF and no
driver accepts anything else.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170613202107.10125-2-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2017-06-13 22:20:52 +02:00
parent 32a1681adc
commit 8243ccb743
14 changed files with 98 additions and 15 deletions
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2
block.c
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@ -3434,7 +3434,7 @@ int bdrv_truncate(BdrvChild *child, int64_t offset, Error **errp)
assert(!(bs->open_flags & BDRV_O_INACTIVE));
ret = drv->bdrv_truncate(bs, offset, errp);
ret = drv->bdrv_truncate(bs, offset, PREALLOC_MODE_OFF, errp);
if (ret == 0) {
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
bdrv_dirty_bitmap_truncate(bs);