nbd: Implement server use of NBD FAST_ZERO
The server side is fairly straightforward: we can always advertise support for detection of fast zero, and implement it by mapping the request to the block layer BDRV_REQ_NO_FALLBACK. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20190823143726.27062-5-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> [eblake: update iotests 223, 233]
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@ -1513,7 +1513,8 @@ NBDExport *nbd_export_new(BlockDriverState *bs, uint64_t dev_offset,
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exp->nbdflags |= NBD_FLAG_CAN_MULTI_CONN;
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exp->nbdflags |= NBD_FLAG_CAN_MULTI_CONN;
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}
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}
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} else {
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} else {
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exp->nbdflags |= NBD_FLAG_SEND_TRIM | NBD_FLAG_SEND_WRITE_ZEROES;
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exp->nbdflags |= (NBD_FLAG_SEND_TRIM | NBD_FLAG_SEND_WRITE_ZEROES |
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NBD_FLAG_SEND_FAST_ZERO);
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}
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}
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assert(size <= INT64_MAX - dev_offset);
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assert(size <= INT64_MAX - dev_offset);
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exp->size = QEMU_ALIGN_DOWN(size, BDRV_SECTOR_SIZE);
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exp->size = QEMU_ALIGN_DOWN(size, BDRV_SECTOR_SIZE);
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@ -2166,7 +2167,7 @@ static int nbd_co_receive_request(NBDRequestData *req, NBDRequest *request,
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if (request->type == NBD_CMD_READ && client->structured_reply) {
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if (request->type == NBD_CMD_READ && client->structured_reply) {
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valid_flags |= NBD_CMD_FLAG_DF;
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valid_flags |= NBD_CMD_FLAG_DF;
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} else if (request->type == NBD_CMD_WRITE_ZEROES) {
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} else if (request->type == NBD_CMD_WRITE_ZEROES) {
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valid_flags |= NBD_CMD_FLAG_NO_HOLE;
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valid_flags |= NBD_CMD_FLAG_NO_HOLE | NBD_CMD_FLAG_FAST_ZERO;
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} else if (request->type == NBD_CMD_BLOCK_STATUS) {
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} else if (request->type == NBD_CMD_BLOCK_STATUS) {
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valid_flags |= NBD_CMD_FLAG_REQ_ONE;
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valid_flags |= NBD_CMD_FLAG_REQ_ONE;
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}
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}
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@ -2305,6 +2306,9 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
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if (!(request->flags & NBD_CMD_FLAG_NO_HOLE)) {
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if (!(request->flags & NBD_CMD_FLAG_NO_HOLE)) {
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flags |= BDRV_REQ_MAY_UNMAP;
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flags |= BDRV_REQ_MAY_UNMAP;
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}
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}
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if (request->flags & NBD_CMD_FLAG_FAST_ZERO) {
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flags |= BDRV_REQ_NO_FALLBACK;
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}
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ret = blk_pwrite_zeroes(exp->blk, request->from + exp->dev_offset,
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ret = blk_pwrite_zeroes(exp->blk, request->from + exp->dev_offset,
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request->len, flags);
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request->len, flags);
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return nbd_send_generic_reply(client, request->handle, ret,
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return nbd_send_generic_reply(client, request->handle, ret,
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@ -49,7 +49,7 @@ exports available: 2
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qemu:dirty-bitmap:b
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qemu:dirty-bitmap:b
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export: 'n2'
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export: 'n2'
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size: 4194304
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size: 4194304
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flags: 0x4ed ( flush fua trim zeroes df cache )
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flags: 0xced ( flush fua trim zeroes df cache fast-zero )
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min block: 1
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min block: 1
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opt block: 4096
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opt block: 4096
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max block: 33554432
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max block: 33554432
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@ -37,7 +37,7 @@ disk size: unavailable
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exports available: 1
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exports available: 1
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export: ''
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export: ''
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size: 67108864
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size: 67108864
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flags: 0x4ed ( flush fua trim zeroes df cache )
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flags: 0xced ( flush fua trim zeroes df cache fast-zero )
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min block: 1
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min block: 1
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opt block: 4096
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opt block: 4096
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max block: 33554432
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max block: 33554432
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