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block: add discard support

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Add a new bdrv_discard method to free blocks in a mapping image, and a new
drive property to set the granularity for these discard.  If no discard
granularity support is set discard support is disabled.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2010-12-16 19:36:31 +01:00 • committed by Kevin Wolf
parent 61d9d6b091
commit bb8bf76fb1
4 changed files with 24 additions and 1 deletions
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11
block.c
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@ -1515,6 +1515,17 @@ int bdrv_has_zero_init(BlockDriverState *bs)
return 1;
}
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
{
if (!bs->drv) {
return -ENOMEDIUM;
}
if (!bs->drv->bdrv_discard) {
return 0;
}
return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
}
/*
* Returns true iff the specified sector is present in the disk image. Drivers
* not implementing the functionality are assumed to not support backing files,