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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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6
block/raw.c
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@ -65,6 +65,11 @@ static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
return 1; /* everything can be opened as raw image */
}
static int raw_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
{
return bdrv_discard(bs->file, sector_num, nb_sectors);
}
static int raw_is_inserted(BlockDriverState *bs)
{
return bdrv_is_inserted(bs->file);
@ -130,6 +135,7 @@ static BlockDriver bdrv_raw = {
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_discard = raw_discard,
.bdrv_is_inserted = raw_is_inserted,
.bdrv_eject = raw_eject,