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block: Convert bdrv_discard() to byte-based

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Another step towards byte-based interfaces everywhere.  Replace
the sector-based bdrv_discard() with a new byte-based
bdrv_pdiscard(), which silently ignores any unaligned head
or tail.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1468624988-423-3-git-send-email-eblake@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Eric Blake 2016-07-15 17:22:51 -06:00 • committed by Stefan Hajnoczi
parent 9f1963b3f7
commit 0c51a893b6
4 changed files with 13 additions and 15 deletions
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3
block/block-backend.c
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@ -1512,7 +1512,8 @@ int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
return ret;
}
return bdrv_discard(blk_bs(blk), sector_num, nb_sectors);
return bdrv_pdiscard(blk_bs(blk), sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS);
}
int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,