From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37906) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avlom-00009j-FQ for qemu-devel@nongnu.org; Thu, 28 Apr 2016 09:17:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1avlog-0005hW-GK for qemu-devel@nongnu.org; Thu, 28 Apr 2016 09:17:20 -0400 From: Kevin Wolf Date: Thu, 28 Apr 2016 15:16:37 +0200 Message-Id: <1461849406-29743-9-git-send-email-kwolf@redhat.com> In-Reply-To: <1461849406-29743-1-git-send-email-kwolf@redhat.com> References: <1461849406-29743-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH v2 08/17] dmg: Implement .bdrv_co_preadv() interface List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: kwolf@redhat.com, mreitz@redhat.com, stefanha@redhat.com, famz@redhat.com, sw@weilnetz.de, qemu-devel@nongnu.org Signed-off-by: Kevin Wolf --- block/dmg.c | 40 +++++++++++++++++++++++----------------- 1 file changed, 23 insertions(+), 17 deletions(-) diff --git a/block/dmg.c b/block/dmg.c index a496eb7..1ea5f22 100644 --- a/block/dmg.c +++ b/block/dmg.c @@ -440,6 +440,8 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags, int ret; bs->read_only = 1; + bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */ + s->n_chunks = 0; s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL; /* used by dmg_read_mish_block to keep track of the current I/O position */ @@ -659,38 +661,42 @@ static inline int dmg_read_chunk(BlockDriverState *bs, uint64_t sector_num) return 0; } -static int dmg_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) +static int coroutine_fn +dmg_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, + QEMUIOVector *qiov, int flags) { BDRVDMGState *s = bs->opaque; - int i; + uint64_t sector_num = offset >> BDRV_SECTOR_BITS; + int nb_sectors = bytes >> BDRV_SECTOR_BITS; + int ret, i; + + assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); + assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); + + qemu_co_mutex_lock(&s->lock); for (i = 0; i < nb_sectors; i++) { uint32_t sector_offset_in_chunk; + void *data; + if (dmg_read_chunk(bs, sector_num + i) != 0) { - return -1; + ret = -EIO; + goto fail; } /* Special case: current chunk is all zeroes. Do not perform a memcpy as * s->uncompressed_chunk may be too small to cover the large all-zeroes * section. dmg_read_chunk is called to find s->current_chunk */ if (s->types[s->current_chunk] == 2) { /* all zeroes block entry */ - memset(buf + i * 512, 0, 512); + qemu_iovec_memset(qiov, i * 512, 0, 512); continue; } sector_offset_in_chunk = sector_num + i - s->sectors[s->current_chunk]; - memcpy(buf + i * 512, - s->uncompressed_chunk + sector_offset_in_chunk * 512, 512); + data = s->uncompressed_chunk + sector_offset_in_chunk * 512; + qemu_iovec_from_buf(qiov, i * 512, data, 512); } - return 0; -} -static coroutine_fn int dmg_co_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - int ret; - BDRVDMGState *s = bs->opaque; - qemu_co_mutex_lock(&s->lock); - ret = dmg_read(bs, sector_num, buf, nb_sectors); + ret = 0; +fail: qemu_co_mutex_unlock(&s->lock); return ret; } @@ -715,7 +721,7 @@ static BlockDriver bdrv_dmg = { .instance_size = sizeof(BDRVDMGState), .bdrv_probe = dmg_probe, .bdrv_open = dmg_open, - .bdrv_read = dmg_co_read, + .bdrv_co_preadv = dmg_co_preadv, .bdrv_close = dmg_close, }; -- 1.8.3.1