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/*
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* Copyright (C) 2009-2010 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef _WIN32
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#include <windows.h>
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#else
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#include <netdb.h>
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#include <netinet/tcp.h>
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#define closesocket(s) close(s)
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#endif
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#include "qemu-common.h"
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#include "qemu-error.h"
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#include "qemu_socket.h"
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#include "block_int.h"
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#define SD_PROTO_VER 0x01
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#define SD_DEFAULT_ADDR "localhost"
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#define SD_DEFAULT_PORT "7000"
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#define SD_OP_CREATE_AND_WRITE_OBJ 0x01
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#define SD_OP_READ_OBJ 0x02
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#define SD_OP_WRITE_OBJ 0x03
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#define SD_OP_NEW_VDI 0x11
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#define SD_OP_LOCK_VDI 0x12
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#define SD_OP_RELEASE_VDI 0x13
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#define SD_OP_GET_VDI_INFO 0x14
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#define SD_OP_READ_VDIS 0x15
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#define SD_FLAG_CMD_WRITE 0x01
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#define SD_FLAG_CMD_COW 0x02
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#define SD_RES_SUCCESS 0x00 /* Success */
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#define SD_RES_UNKNOWN 0x01 /* Unknown error */
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#define SD_RES_NO_OBJ 0x02 /* No object found */
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#define SD_RES_EIO 0x03 /* I/O error */
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#define SD_RES_VDI_EXIST 0x04 /* Vdi exists already */
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#define SD_RES_INVALID_PARMS 0x05 /* Invalid parameters */
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#define SD_RES_SYSTEM_ERROR 0x06 /* System error */
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#define SD_RES_VDI_LOCKED 0x07 /* Vdi is locked */
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#define SD_RES_NO_VDI 0x08 /* No vdi found */
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#define SD_RES_NO_BASE_VDI 0x09 /* No base vdi found */
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#define SD_RES_VDI_READ 0x0A /* Cannot read requested vdi */
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#define SD_RES_VDI_WRITE 0x0B /* Cannot write requested vdi */
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#define SD_RES_BASE_VDI_READ 0x0C /* Cannot read base vdi */
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#define SD_RES_BASE_VDI_WRITE 0x0D /* Cannot write base vdi */
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#define SD_RES_NO_TAG 0x0E /* Requested tag is not found */
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#define SD_RES_STARTUP 0x0F /* Sheepdog is on starting up */
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#define SD_RES_VDI_NOT_LOCKED 0x10 /* Vdi is not locked */
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#define SD_RES_SHUTDOWN 0x11 /* Sheepdog is shutting down */
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#define SD_RES_NO_MEM 0x12 /* Cannot allocate memory */
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#define SD_RES_FULL_VDI 0x13 /* we already have the maximum vdis */
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#define SD_RES_VER_MISMATCH 0x14 /* Protocol version mismatch */
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#define SD_RES_NO_SPACE 0x15 /* Server has no room for new objects */
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#define SD_RES_WAIT_FOR_FORMAT 0x16 /* Waiting for a format operation */
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#define SD_RES_WAIT_FOR_JOIN 0x17 /* Waiting for other nodes joining */
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#define SD_RES_JOIN_FAILED 0x18 /* Target node had failed to join sheepdog */
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/*
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* Object ID rules
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*
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* 0 - 19 (20 bits): data object space
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* 20 - 31 (12 bits): reserved data object space
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* 32 - 55 (24 bits): vdi object space
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* 56 - 59 ( 4 bits): reserved vdi object space
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* 60 - 63 ( 4 bits): object type indentifier space
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*/
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#define VDI_SPACE_SHIFT 32
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#define VDI_BIT (UINT64_C(1) << 63)
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#define VMSTATE_BIT (UINT64_C(1) << 62)
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#define MAX_DATA_OBJS (UINT64_C(1) << 20)
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#define MAX_CHILDREN 1024
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#define SD_MAX_VDI_LEN 256
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#define SD_MAX_VDI_TAG_LEN 256
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#define SD_NR_VDIS (1U << 24)
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#define SD_DATA_OBJ_SIZE (UINT64_C(1) << 22)
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#define SD_MAX_VDI_SIZE (SD_DATA_OBJ_SIZE * MAX_DATA_OBJS)
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#define SECTOR_SIZE 512
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#define SD_INODE_SIZE (sizeof(SheepdogInode))
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#define CURRENT_VDI_ID 0
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typedef struct SheepdogReq {
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uint8_t proto_ver;
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uint8_t opcode;
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uint16_t flags;
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uint32_t epoch;
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uint32_t id;
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uint32_t data_length;
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uint32_t opcode_specific[8];
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} SheepdogReq;
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typedef struct SheepdogRsp {
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uint8_t proto_ver;
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uint8_t opcode;
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uint16_t flags;
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uint32_t epoch;
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uint32_t id;
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uint32_t data_length;
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uint32_t result;
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uint32_t opcode_specific[7];
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} SheepdogRsp;
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typedef struct SheepdogObjReq {
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uint8_t proto_ver;
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uint8_t opcode;
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uint16_t flags;
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uint32_t epoch;
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uint32_t id;
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uint32_t data_length;
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uint64_t oid;
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uint64_t cow_oid;
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uint32_t copies;
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uint32_t rsvd;
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uint64_t offset;
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} SheepdogObjReq;
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typedef struct SheepdogObjRsp {
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uint8_t proto_ver;
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uint8_t opcode;
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uint16_t flags;
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uint32_t epoch;
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uint32_t id;
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uint32_t data_length;
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uint32_t result;
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uint32_t copies;
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uint32_t pad[6];
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} SheepdogObjRsp;
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typedef struct SheepdogVdiReq {
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uint8_t proto_ver;
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uint8_t opcode;
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uint16_t flags;
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uint32_t epoch;
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uint32_t id;
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uint32_t data_length;
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uint64_t vdi_size;
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uint32_t base_vdi_id;
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uint32_t copies;
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uint32_t snapid;
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uint32_t pad[3];
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} SheepdogVdiReq;
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typedef struct SheepdogVdiRsp {
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uint8_t proto_ver;
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uint8_t opcode;
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uint16_t flags;
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uint32_t epoch;
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uint32_t id;
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uint32_t data_length;
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uint32_t result;
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uint32_t rsvd;
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uint32_t vdi_id;
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uint32_t pad[5];
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} SheepdogVdiRsp;
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typedef struct SheepdogInode {
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char name[SD_MAX_VDI_LEN];
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char tag[SD_MAX_VDI_TAG_LEN];
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uint64_t ctime;
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uint64_t snap_ctime;
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uint64_t vm_clock_nsec;
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uint64_t vdi_size;
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uint64_t vm_state_size;
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uint16_t copy_policy;
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uint8_t nr_copies;
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uint8_t block_size_shift;
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uint32_t snap_id;
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uint32_t vdi_id;
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uint32_t parent_vdi_id;
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uint32_t child_vdi_id[MAX_CHILDREN];
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uint32_t data_vdi_id[MAX_DATA_OBJS];
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} SheepdogInode;
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/*
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* 64 bit FNV-1a non-zero initial basis
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*/
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#define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
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/*
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* 64 bit Fowler/Noll/Vo FNV-1a hash code
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*/
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static inline uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval)
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{
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unsigned char *bp = buf;
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unsigned char *be = bp + len;
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while (bp < be) {
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hval ^= (uint64_t) *bp++;
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hval += (hval << 1) + (hval << 4) + (hval << 5) +
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(hval << 7) + (hval << 8) + (hval << 40);
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}
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return hval;
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}
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static inline int is_data_obj_writeable(SheepdogInode *inode, unsigned int idx)
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{
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return inode->vdi_id == inode->data_vdi_id[idx];
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}
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static inline int is_data_obj(uint64_t oid)
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{
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return !(VDI_BIT & oid);
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}
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static inline uint64_t data_oid_to_idx(uint64_t oid)
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{
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return oid & (MAX_DATA_OBJS - 1);
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}
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static inline uint64_t vid_to_vdi_oid(uint32_t vid)
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{
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return VDI_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT);
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}
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static inline uint64_t vid_to_vmstate_oid(uint32_t vid, uint32_t idx)
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{
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return VMSTATE_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT) | idx;
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}
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static inline uint64_t vid_to_data_oid(uint32_t vid, uint32_t idx)
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{
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return ((uint64_t)vid << VDI_SPACE_SHIFT) | idx;
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}
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static inline int is_snapshot(struct SheepdogInode *inode)
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{
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return !!inode->snap_ctime;
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}
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#undef dprintf
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#ifdef DEBUG_SDOG
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#define dprintf(fmt, args...) \
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do { \
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fprintf(stdout, "%s %d: " fmt, __func__, __LINE__, ##args); \
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} while (0)
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#else
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#define dprintf(fmt, args...)
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#endif
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typedef struct SheepdogAIOCB SheepdogAIOCB;
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typedef struct AIOReq {
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SheepdogAIOCB *aiocb;
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unsigned int iov_offset;
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uint64_t oid;
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uint64_t base_oid;
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uint64_t offset;
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unsigned int data_len;
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uint8_t flags;
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uint32_t id;
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QLIST_ENTRY(AIOReq) outstanding_aio_siblings;
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QLIST_ENTRY(AIOReq) aioreq_siblings;
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} AIOReq;
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enum AIOCBState {
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AIOCB_WRITE_UDATA,
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AIOCB_READ_UDATA,
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};
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struct SheepdogAIOCB {
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BlockDriverAIOCB common;
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QEMUIOVector *qiov;
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int64_t sector_num;
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int nb_sectors;
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int ret;
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enum AIOCBState aiocb_type;
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QEMUBH *bh;
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void (*aio_done_func)(SheepdogAIOCB *);
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int canceled;
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QLIST_HEAD(aioreq_head, AIOReq) aioreq_head;
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};
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typedef struct BDRVSheepdogState {
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SheepdogInode inode;
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uint32_t min_dirty_data_idx;
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uint32_t max_dirty_data_idx;
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char name[SD_MAX_VDI_LEN];
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int is_snapshot;
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char *addr;
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char *port;
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int fd;
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uint32_t aioreq_seq_num;
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QLIST_HEAD(outstanding_aio_head, AIOReq) outstanding_aio_head;
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} BDRVSheepdogState;
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static const char * sd_strerror(int err)
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{
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int i;
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static const struct {
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int err;
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const char *desc;
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} errors[] = {
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{SD_RES_SUCCESS, "Success"},
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{SD_RES_UNKNOWN, "Unknown error"},
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{SD_RES_NO_OBJ, "No object found"},
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{SD_RES_EIO, "I/O error"},
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{SD_RES_VDI_EXIST, "VDI exists already"},
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{SD_RES_INVALID_PARMS, "Invalid parameters"},
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{SD_RES_SYSTEM_ERROR, "System error"},
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{SD_RES_VDI_LOCKED, "VDI is already locked"},
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{SD_RES_NO_VDI, "No vdi found"},
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{SD_RES_NO_BASE_VDI, "No base VDI found"},
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{SD_RES_VDI_READ, "Failed read the requested VDI"},
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{SD_RES_VDI_WRITE, "Failed to write the requested VDI"},
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{SD_RES_BASE_VDI_READ, "Failed to read the base VDI"},
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{SD_RES_BASE_VDI_WRITE, "Failed to write the base VDI"},
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{SD_RES_NO_TAG, "Failed to find the requested tag"},
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{SD_RES_STARTUP, "The system is still booting"},
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{SD_RES_VDI_NOT_LOCKED, "VDI isn't locked"},
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{SD_RES_SHUTDOWN, "The system is shutting down"},
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{SD_RES_NO_MEM, "Out of memory on the server"},
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{SD_RES_FULL_VDI, "We already have the maximum vdis"},
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{SD_RES_VER_MISMATCH, "Protocol version mismatch"},
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{SD_RES_NO_SPACE, "Server has no space for new objects"},
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{SD_RES_WAIT_FOR_FORMAT, "Sheepdog is waiting for a format operation"},
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{SD_RES_WAIT_FOR_JOIN, "Sheepdog is waiting for other nodes joining"},
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{SD_RES_JOIN_FAILED, "Target node had failed to join sheepdog"},
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};
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for (i = 0; i < ARRAY_SIZE(errors); ++i) {
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if (errors[i].err == err) {
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return errors[i].desc;
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}
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}
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return "Invalid error code";
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}
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/*
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* Sheepdog I/O handling:
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*
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* 1. In the sd_aio_readv/writev, read/write requests are added to the
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* QEMU Bottom Halves.
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*
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* 2. In sd_readv_writev_bh_cb, the callbacks of BHs, we send the I/O
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* requests to the server and link the requests to the
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* outstanding_list in the BDRVSheepdogState. we exits the
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* function without waiting for receiving the response.
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*
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* 3. We receive the response in aio_read_response, the fd handler to
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* the sheepdog connection. If metadata update is needed, we send
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* the write request to the vdi object in sd_write_done, the write
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* completion function. The AIOCB callback is not called until all
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* the requests belonging to the AIOCB are finished.
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*/
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static inline AIOReq *alloc_aio_req(BDRVSheepdogState *s, SheepdogAIOCB *acb,
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uint64_t oid, unsigned int data_len,
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uint64_t offset, uint8_t flags,
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uint64_t base_oid, unsigned int iov_offset)
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{
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AIOReq *aio_req;
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aio_req = qemu_malloc(sizeof(*aio_req));
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aio_req->aiocb = acb;
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aio_req->iov_offset = iov_offset;
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aio_req->oid = oid;
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aio_req->base_oid = base_oid;
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aio_req->offset = offset;
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aio_req->data_len = data_len;
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aio_req->flags = flags;
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aio_req->id = s->aioreq_seq_num++;
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389 |
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390 |
QLIST_INSERT_HEAD(&s->outstanding_aio_head, aio_req,
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outstanding_aio_siblings);
|
|
392 |
QLIST_INSERT_HEAD(&acb->aioreq_head, aio_req, aioreq_siblings);
|
|
393 |
|
|
394 |
return aio_req;
|
|
395 |
}
|
|
396 |
|
|
397 |
static inline int free_aio_req(BDRVSheepdogState *s, AIOReq *aio_req)
|
|
398 |
{
|
|
399 |
SheepdogAIOCB *acb = aio_req->aiocb;
|
|
400 |
QLIST_REMOVE(aio_req, outstanding_aio_siblings);
|
|
401 |
QLIST_REMOVE(aio_req, aioreq_siblings);
|
|
402 |
qemu_free(aio_req);
|
|
403 |
|
|
404 |
return !QLIST_EMPTY(&acb->aioreq_head);
|
|
405 |
}
|
|
406 |
|
|
407 |
static void sd_finish_aiocb(SheepdogAIOCB *acb)
|
|
408 |
{
|
|
409 |
if (!acb->canceled) {
|
|
410 |
acb->common.cb(acb->common.opaque, acb->ret);
|
|
411 |
}
|
|
412 |
qemu_aio_release(acb);
|
|
413 |
}
|
|
414 |
|
|
415 |
static void sd_aio_cancel(BlockDriverAIOCB *blockacb)
|
|
416 |
{
|
|
417 |
SheepdogAIOCB *acb = (SheepdogAIOCB *)blockacb;
|
|
418 |
|
|
419 |
/*
|
|
420 |
* Sheepdog cannot cancel the requests which are already sent to
|
|
421 |
* the servers, so we just complete the request with -EIO here.
|
|
422 |
*/
|
|
423 |
acb->common.cb(acb->common.opaque, -EIO);
|
|
424 |
acb->canceled = 1;
|
|
425 |
}
|
|
426 |
|
|
427 |
static AIOPool sd_aio_pool = {
|
|
428 |
.aiocb_size = sizeof(SheepdogAIOCB),
|
|
429 |
.cancel = sd_aio_cancel,
|
|
430 |
};
|
|
431 |
|
|
432 |
static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
|
|
433 |
int64_t sector_num, int nb_sectors,
|
|
434 |
BlockDriverCompletionFunc *cb, void *opaque)
|
|
435 |
{
|
|
436 |
SheepdogAIOCB *acb;
|
|
437 |
|
|
438 |
acb = qemu_aio_get(&sd_aio_pool, bs, cb, opaque);
|
|
439 |
|
|
440 |
acb->qiov = qiov;
|
|
441 |
|
|
442 |
acb->sector_num = sector_num;
|
|
443 |
acb->nb_sectors = nb_sectors;
|
|
444 |
|
|
445 |
acb->aio_done_func = NULL;
|
|
446 |
acb->canceled = 0;
|
|
447 |
acb->bh = NULL;
|
|
448 |
acb->ret = 0;
|
|
449 |
QLIST_INIT(&acb->aioreq_head);
|
|
450 |
return acb;
|
|
451 |
}
|
|
452 |
|
|
453 |
static int sd_schedule_bh(QEMUBHFunc *cb, SheepdogAIOCB *acb)
|
|
454 |
{
|
|
455 |
if (acb->bh) {
|
|
456 |
error_report("bug: %d %d\n", acb->aiocb_type, acb->aiocb_type);
|
|
457 |
return -EIO;
|
|
458 |
}
|
|
459 |
|
|
460 |
acb->bh = qemu_bh_new(cb, acb);
|
|
461 |
if (!acb->bh) {
|
|
462 |
error_report("oom: %d %d\n", acb->aiocb_type, acb->aiocb_type);
|
|
463 |
return -EIO;
|
|
464 |
}
|
|
465 |
|
|
466 |
qemu_bh_schedule(acb->bh);
|
|
467 |
|
|
468 |
return 0;
|
|
469 |
}
|
|
470 |
|
|
471 |
#ifdef _WIN32
|
|
472 |
|
|
473 |
struct msghdr {
|
|
474 |
struct iovec *msg_iov;
|
|
475 |
size_t msg_iovlen;
|
|
476 |
};
|
|
477 |
|
|
478 |
static ssize_t sendmsg(int s, const struct msghdr *msg, int flags)
|
|
479 |
{
|
|
480 |
size_t size = 0;
|
|
481 |
char *buf, *p;
|
|
482 |
int i, ret;
|
|
483 |
|
|
484 |
/* count the msg size */
|
|
485 |
for (i = 0; i < msg->msg_iovlen; i++) {
|
|
486 |
size += msg->msg_iov[i].iov_len;
|
|
487 |
}
|
|
488 |
buf = qemu_malloc(size);
|
|
489 |
|
|
490 |
p = buf;
|
|
491 |
for (i = 0; i < msg->msg_iovlen; i++) {
|
|
492 |
memcpy(p, msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len);
|
|
493 |
p += msg->msg_iov[i].iov_len;
|
|
494 |
}
|
|
495 |
|
|
496 |
ret = send(s, buf, size, flags);
|
|
497 |
|
|
498 |
qemu_free(buf);
|
|
499 |
return ret;
|
|
500 |
}
|
|
501 |
|
|
502 |
static ssize_t recvmsg(int s, struct msghdr *msg, int flags)
|
|
503 |
{
|
|
504 |
size_t size = 0;
|
|
505 |
char *buf, *p;
|
|
506 |
int i, ret;
|
|
507 |
|
|
508 |
/* count the msg size */
|
|
509 |
for (i = 0; i < msg->msg_iovlen; i++) {
|
|
510 |
size += msg->msg_iov[i].iov_len;
|
|
511 |
}
|
|
512 |
buf = qemu_malloc(size);
|
|
513 |
|
|
514 |
ret = recv(s, buf, size, flags);
|
|
515 |
if (ret < 0) {
|
|
516 |
goto out;
|
|
517 |
}
|
|
518 |
|
|
519 |
p = buf;
|
|
520 |
for (i = 0; i < msg->msg_iovlen; i++) {
|
|
521 |
memcpy(msg->msg_iov[i].iov_base, p, msg->msg_iov[i].iov_len);
|
|
522 |
p += msg->msg_iov[i].iov_len;
|
|
523 |
}
|
|
524 |
out:
|
|
525 |
qemu_free(buf);
|
|
526 |
return ret;
|
|
527 |
}
|
|
528 |
|
|
529 |
#endif
|
|
530 |
|
|
531 |
/*
|
|
532 |
* Send/recv data with iovec buffers
|
|
533 |
*
|
|
534 |
* This function send/recv data from/to the iovec buffer directly.
|
|
535 |
* The first `offset' bytes in the iovec buffer are skipped and next
|
|
536 |
* `len' bytes are used.
|
|
537 |
*
|
|
538 |
* For example,
|
|
539 |
*
|
|
540 |
* do_send_recv(sockfd, iov, len, offset, 1);
|
|
541 |
*
|
|
542 |
* is equals to
|
|
543 |
*
|
|
544 |
* char *buf = malloc(size);
|
|
545 |
* iov_to_buf(iov, iovcnt, buf, offset, size);
|
|
546 |
* send(sockfd, buf, size, 0);
|
|
547 |
* free(buf);
|
|
548 |
*/
|
|
549 |
static int do_send_recv(int sockfd, struct iovec *iov, int len, int offset,
|
|
550 |
int write)
|
|
551 |
{
|
|
552 |
struct msghdr msg;
|
|
553 |
int ret, diff;
|
|
554 |
|
|
555 |
memset(&msg, 0, sizeof(msg));
|
|
556 |
msg.msg_iov = iov;
|
|
557 |
msg.msg_iovlen = 1;
|
|
558 |
|
|
559 |
len += offset;
|
|
560 |
|
|
561 |
while (iov->iov_len < len) {
|
|
562 |
len -= iov->iov_len;
|
|
563 |
|
|
564 |
iov++;
|
|
565 |
msg.msg_iovlen++;
|
|
566 |
}
|
|
567 |
|
|
568 |
diff = iov->iov_len - len;
|
|
569 |
iov->iov_len -= diff;
|
|
570 |
|
|
571 |
while (msg.msg_iov->iov_len <= offset) {
|
|
572 |
offset -= msg.msg_iov->iov_len;
|
|
573 |
|
|
574 |
msg.msg_iov++;
|
|
575 |
msg.msg_iovlen--;
|
|
576 |
}
|
|
577 |
|
|
578 |
msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base + offset;
|
|
579 |
msg.msg_iov->iov_len -= offset;
|
|
580 |
|
|
581 |
if (write) {
|
|
582 |
ret = sendmsg(sockfd, &msg, 0);
|
|
583 |
} else {
|
|
584 |
ret = recvmsg(sockfd, &msg, 0);
|
|
585 |
}
|
|
586 |
|
|
587 |
msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base - offset;
|
|
588 |
msg.msg_iov->iov_len += offset;
|
|
589 |
|
|
590 |
iov->iov_len += diff;
|
|
591 |
return ret;
|
|
592 |
}
|
|
593 |
|
|
594 |
static int connect_to_sdog(const char *addr, const char *port)
|
|
595 |
{
|
|
596 |
char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
|
|
597 |
int fd, ret;
|
|
598 |
struct addrinfo hints, *res, *res0;
|
|
599 |
|
|
600 |
if (!addr) {
|
|
601 |
addr = SD_DEFAULT_ADDR;
|
|
602 |
port = SD_DEFAULT_PORT;
|
|
603 |
}
|
|
604 |
|
|
605 |
memset(&hints, 0, sizeof(hints));
|
|
606 |
hints.ai_socktype = SOCK_STREAM;
|
|
607 |
|
|
608 |
ret = getaddrinfo(addr, port, &hints, &res0);
|
|
609 |
if (ret) {
|
|
610 |
error_report("unable to get address info %s, %s\n",
|
|
611 |
addr, strerror(errno));
|
|
612 |
return -1;
|
|
613 |
}
|
|
614 |
|
|
615 |
for (res = res0; res; res = res->ai_next) {
|
|
616 |
ret = getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
|
|
617 |
sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
|
|
618 |
if (ret) {
|
|
619 |
continue;
|
|
620 |
}
|
|
621 |
|
|
622 |
fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
|
|
623 |
if (fd < 0) {
|
|
624 |
continue;
|
|
625 |
}
|
|
626 |
|
|
627 |
reconnect:
|
|
628 |
ret = connect(fd, res->ai_addr, res->ai_addrlen);
|
|
629 |
if (ret < 0) {
|
|
630 |
if (errno == EINTR) {
|
|
631 |
goto reconnect;
|
|
632 |
}
|
|
633 |
break;
|
|
634 |
}
|
|
635 |
|
|
636 |
dprintf("connected to %s:%s\n", addr, port);
|
|
637 |
goto success;
|
|
638 |
}
|
|
639 |
fd = -1;
|
|
640 |
error_report("failed connect to %s:%s\n", addr, port);
|
|
641 |
success:
|
|
642 |
freeaddrinfo(res0);
|
|
643 |
return fd;
|
|
644 |
}
|
|
645 |
|
|
646 |
static int do_readv_writev(int sockfd, struct iovec *iov, int len,
|
|
647 |
int iov_offset, int write)
|
|
648 |
{
|
|
649 |
int ret;
|
|
650 |
again:
|
|
651 |
ret = do_send_recv(sockfd, iov, len, iov_offset, write);
|
|
652 |
if (ret < 0) {
|
|
653 |
if (errno == EINTR || errno == EAGAIN) {
|
|
654 |
goto again;
|
|
655 |
}
|
|
656 |
error_report("failed to recv a rsp, %s\n", strerror(errno));
|
|
657 |
return 1;
|
|
658 |
}
|
|
659 |
|
|
660 |
iov_offset += ret;
|
|
661 |
len -= ret;
|
|
662 |
if (len) {
|
|
663 |
goto again;
|
|
664 |
}
|
|
665 |
|
|
666 |
return 0;
|
|
667 |
}
|
|
668 |
|
|
669 |
static int do_readv(int sockfd, struct iovec *iov, int len, int iov_offset)
|
|
670 |
{
|
|
671 |
return do_readv_writev(sockfd, iov, len, iov_offset, 0);
|
|
672 |
}
|
|
673 |
|
|
674 |
static int do_writev(int sockfd, struct iovec *iov, int len, int iov_offset)
|
|
675 |
{
|
|
676 |
return do_readv_writev(sockfd, iov, len, iov_offset, 1);
|
|
677 |
}
|
|
678 |
|
|
679 |
static int do_read_write(int sockfd, void *buf, int len, int write)
|
|
680 |
{
|
|
681 |
struct iovec iov;
|
|
682 |
|
|
683 |
iov.iov_base = buf;
|
|
684 |
iov.iov_len = len;
|
|
685 |
|
|
686 |
return do_readv_writev(sockfd, &iov, len, 0, write);
|
|
687 |
}
|
|
688 |
|
|
689 |
static int do_read(int sockfd, void *buf, int len)
|
|
690 |
{
|
|
691 |
return do_read_write(sockfd, buf, len, 0);
|
|
692 |
}
|
|
693 |
|
|
694 |
static int do_write(int sockfd, void *buf, int len)
|
|
695 |
{
|
|
696 |
return do_read_write(sockfd, buf, len, 1);
|
|
697 |
}
|
|
698 |
|
|
699 |
static int send_req(int sockfd, SheepdogReq *hdr, void *data,
|
|
700 |
unsigned int *wlen)
|
|
701 |
{
|
|
702 |
int ret;
|
|
703 |
struct iovec iov[2];
|
|
704 |
|
|
705 |
iov[0].iov_base = hdr;
|
|
706 |
iov[0].iov_len = sizeof(*hdr);
|
|
707 |
|
|
708 |
if (*wlen) {
|
|
709 |
iov[1].iov_base = data;
|
|
710 |
iov[1].iov_len = *wlen;
|
|
711 |
}
|
|
712 |
|
|
713 |
ret = do_writev(sockfd, iov, sizeof(*hdr) + *wlen, 0);
|
|
714 |
if (ret) {
|
|
715 |
error_report("failed to send a req, %s\n", strerror(errno));
|
|
716 |
ret = -1;
|
|
717 |
}
|
|
718 |
|
|
719 |
return ret;
|
|
720 |
}
|
|
721 |
|
|
722 |
static int do_req(int sockfd, SheepdogReq *hdr, void *data,
|
|
723 |
unsigned int *wlen, unsigned int *rlen)
|
|
724 |
{
|
|
725 |
int ret;
|
|
726 |
|
|
727 |
ret = send_req(sockfd, hdr, data, wlen);
|
|
728 |
if (ret) {
|
|
729 |
ret = -1;
|
|
730 |
goto out;
|
|
731 |
}
|
|
732 |
|
|
733 |
ret = do_read(sockfd, hdr, sizeof(*hdr));
|
|
734 |
if (ret) {
|
|
735 |
error_report("failed to get a rsp, %s\n", strerror(errno));
|
|
736 |
ret = -1;
|
|
737 |
goto out;
|
|
738 |
}
|
|
739 |
|
|
740 |
if (*rlen > hdr->data_length) {
|
|
741 |
*rlen = hdr->data_length;
|
|
742 |
}
|
|
743 |
|
|
744 |
if (*rlen) {
|
|
745 |
ret = do_read(sockfd, data, *rlen);
|
|
746 |
if (ret) {
|
|
747 |
error_report("failed to get the data, %s\n", strerror(errno));
|
|
748 |
ret = -1;
|
|
749 |
goto out;
|
|
750 |
}
|
|
751 |
}
|
|
752 |
ret = 0;
|
|
753 |
out:
|
|
754 |
return ret;
|
|
755 |
}
|
|
756 |
|
|
757 |
static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
|
|
758 |
struct iovec *iov, int niov, int create,
|
|
759 |
enum AIOCBState aiocb_type);
|
|
760 |
|
|
761 |
/*
|
|
762 |
* This function searchs pending requests to the object `oid', and
|
|
763 |
* sends them.
|
|
764 |
*/
|
|
765 |
static void send_pending_req(BDRVSheepdogState *s, uint64_t oid, uint32_t id)
|
|
766 |
{
|
|
767 |
AIOReq *aio_req, *next;
|
|
768 |
SheepdogAIOCB *acb;
|
|
769 |
int ret;
|
|
770 |
|
|
771 |
QLIST_FOREACH_SAFE(aio_req, &s->outstanding_aio_head,
|
|
772 |
outstanding_aio_siblings, next) {
|
|
773 |
if (id == aio_req->id) {
|
|
774 |
continue;
|
|
775 |
}
|
|
776 |
if (aio_req->oid != oid) {
|
|
777 |
continue;
|
|
778 |
}
|
|
779 |
|
|
780 |
acb = aio_req->aiocb;
|
|
781 |
ret = add_aio_request(s, aio_req, acb->qiov->iov,
|
|
782 |
acb->qiov->niov, 0, acb->aiocb_type);
|
|
783 |
if (ret < 0) {
|
|
784 |
error_report("add_aio_request is failed\n");
|
|
785 |
free_aio_req(s, aio_req);
|
|
786 |
if (QLIST_EMPTY(&acb->aioreq_head)) {
|
|
787 |
sd_finish_aiocb(acb);
|
|
788 |
}
|
|
789 |
}
|
|
790 |
}
|
|
791 |
}
|
|
792 |
|
|
793 |
/*
|
|
794 |
* Receive responses of the I/O requests.
|
|
795 |
*
|
|
796 |
* This function is registered as a fd handler, and called from the
|
|
797 |
* main loop when s->fd is ready for reading responses.
|
|
798 |
*/
|
|
799 |
static void aio_read_response(void *opaque)
|
|
800 |
{
|
|
801 |
SheepdogObjRsp rsp;
|
|
802 |
BDRVSheepdogState *s = opaque;
|
|
803 |
int fd = s->fd;
|
|
804 |
int ret;
|
|
805 |
AIOReq *aio_req = NULL;
|
|
806 |
SheepdogAIOCB *acb;
|
|
807 |
int rest;
|
|
808 |
unsigned long idx;
|
|
809 |
|
|
810 |
if (QLIST_EMPTY(&s->outstanding_aio_head)) {
|
|
811 |
return;
|
|
812 |
}
|
|
813 |
|
|
814 |
/* read a header */
|
|
815 |
ret = do_read(fd, &rsp, sizeof(rsp));
|
|
816 |
if (ret) {
|
|
817 |
error_report("failed to get the header, %s\n", strerror(errno));
|
|
818 |
return;
|
|
819 |
}
|
|
820 |
|
|
821 |
/* find the right aio_req from the outstanding_aio list */
|
|
822 |
QLIST_FOREACH(aio_req, &s->outstanding_aio_head, outstanding_aio_siblings) {
|
|
823 |
if (aio_req->id == rsp.id) {
|
|
824 |
break;
|
|
825 |
}
|
|
826 |
}
|
|
827 |
if (!aio_req) {
|
|
828 |
error_report("cannot find aio_req %x\n", rsp.id);
|
|
829 |
return;
|
|
830 |
}
|
|
831 |
|
|
832 |
acb = aio_req->aiocb;
|
|
833 |
|
|
834 |
switch (acb->aiocb_type) {
|
|
835 |
case AIOCB_WRITE_UDATA:
|
|
836 |
if (!is_data_obj(aio_req->oid)) {
|
|
837 |
break;
|
|
838 |
}
|
|
839 |
idx = data_oid_to_idx(aio_req->oid);
|
|
840 |
|
|
841 |
if (s->inode.data_vdi_id[idx] != s->inode.vdi_id) {
|
|
842 |
/*
|
|
843 |
* If the object is newly created one, we need to update
|
|
844 |
* the vdi object (metadata object). min_dirty_data_idx
|
|
845 |
* and max_dirty_data_idx are changed to include updated
|
|
846 |
* index between them.
|
|
847 |
*/
|
|
848 |
s->inode.data_vdi_id[idx] = s->inode.vdi_id;
|
|
849 |
s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx);
|
|
850 |
s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx);
|
|
851 |
|
|
852 |
/*
|
|
853 |
* Some requests may be blocked because simultaneous
|
|
854 |
* create requests are not allowed, so we search the
|
|
855 |
* pending requests here.
|
|
856 |
*/
|
|
857 |
send_pending_req(s, vid_to_data_oid(s->inode.vdi_id, idx), rsp.id);
|
|
858 |
}
|
|
859 |
break;
|
|
860 |
case AIOCB_READ_UDATA:
|
|
861 |
ret = do_readv(fd, acb->qiov->iov, rsp.data_length,
|
|
862 |
aio_req->iov_offset);
|
|
863 |
if (ret) {
|
|
864 |
error_report("failed to get the data, %s\n", strerror(errno));
|
|
865 |
return;
|
|
866 |
}
|
|
867 |
break;
|
|
868 |
}
|
|
869 |
|
|
870 |
if (rsp.result != SD_RES_SUCCESS) {
|
|
871 |
acb->ret = -EIO;
|
|
872 |
error_report("%s\n", sd_strerror(rsp.result));
|
|
873 |
}
|
|
874 |
|
|
875 |
rest = free_aio_req(s, aio_req);
|
|
876 |
if (!rest) {
|
|
877 |
/*
|
|
878 |
* We've finished all requests which belong to the AIOCB, so
|
|
879 |
* we can call the callback now.
|
|
880 |
*/
|
|
881 |
acb->aio_done_func(acb);
|
|
882 |
}
|
|
883 |
}
|
|
884 |
|
|
885 |
static int aio_flush_request(void *opaque)
|
|
886 |
{
|
|
887 |
BDRVSheepdogState *s = opaque;
|
|
888 |
|
|
889 |
return !QLIST_EMPTY(&s->outstanding_aio_head);
|
|
890 |
}
|
|
891 |
|
|
892 |
#ifdef _WIN32
|
|
893 |
|
|
894 |
static int set_cork(int fd, int v)
|
|
895 |
{
|
|
896 |
return 0;
|
|
897 |
}
|
|
898 |
|
|
899 |
#else
|
|
900 |
|
|
901 |
static int set_cork(int fd, int v)
|
|
902 |
{
|
|
903 |
return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
|
|
904 |
}
|
|
905 |
|
|
906 |
#endif
|
|
907 |
|
|
908 |
static int set_nodelay(int fd)
|
|
909 |
{
|
|
910 |
int ret, opt;
|
|
911 |
|
|
912 |
opt = 1;
|
|
913 |
ret = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt));
|
|
914 |
return ret;
|
|
915 |
}
|
|
916 |
|
|
917 |
/*
|
|
918 |
* Return a socket discriptor to read/write objects.
|
|
919 |
*
|
|
920 |
* We cannot use this discriptor for other operations because
|
|
921 |
* the block driver may be on waiting response from the server.
|
|
922 |
*/
|
|
923 |
static int get_sheep_fd(BDRVSheepdogState *s)
|
|
924 |
{
|
|
925 |
int ret, fd;
|
|
926 |
|
|
927 |
fd = connect_to_sdog(s->addr, s->port);
|
|
928 |
if (fd < 0) {
|
|
929 |
error_report("%s\n", strerror(errno));
|
|
930 |
return -1;
|
|
931 |
}
|
|
932 |
|
|
933 |
socket_set_nonblock(fd);
|
|
934 |
|
|
935 |
ret = set_nodelay(fd);
|
|
936 |
if (ret) {
|
|
937 |
error_report("%s\n", strerror(errno));
|
|
938 |
closesocket(fd);
|
|
939 |
return -1;
|
|
940 |
}
|
|
941 |
|
|
942 |
qemu_aio_set_fd_handler(fd, aio_read_response, NULL, aio_flush_request,
|
|
943 |
NULL, s);
|
|
944 |
return fd;
|
|
945 |
}
|
|
946 |
|
|
947 |
/*
|
|
948 |
* Parse a filename
|
|
949 |
*
|
|
950 |
* filename must be one of the following formats:
|
|
951 |
* 1. [vdiname]
|
|
952 |
* 2. [vdiname]:[snapid]
|
|
953 |
* 3. [vdiname]:[tag]
|
|
954 |
* 4. [hostname]:[port]:[vdiname]
|
|
955 |
* 5. [hostname]:[port]:[vdiname]:[snapid]
|
|
956 |
* 6. [hostname]:[port]:[vdiname]:[tag]
|
|
957 |
*
|
|
958 |
* You can boot from the snapshot images by specifying `snapid` or
|
|
959 |
* `tag'.
|
|
960 |
*
|
|
961 |
* You can run VMs outside the Sheepdog cluster by specifying
|
|
962 |
* `hostname' and `port' (experimental).
|
|
963 |
*/
|
|
964 |
static int parse_vdiname(BDRVSheepdogState *s, const char *filename,
|
|
965 |
char *vdi, uint32_t *snapid, char *tag)
|
|
966 |
{
|
|
967 |
char *p, *q;
|
|
968 |
int nr_sep;
|
|
969 |
|
|
970 |
p = q = qemu_strdup(filename);
|
|
971 |
|
|
972 |
/* count the number of separators */
|
|
973 |
nr_sep = 0;
|
|
974 |
while (*p) {
|
|
975 |
if (*p == ':') {
|
|
976 |
nr_sep++;
|
|
977 |
}
|
|
978 |
p++;
|
|
979 |
}
|
|
980 |
p = q;
|
|
981 |
|
|
982 |
/* use the first two tokens as hostname and port number. */
|
|
983 |
if (nr_sep >= 2) {
|
|
984 |
s->addr = p;
|
|
985 |
p = strchr(p, ':');
|
|
986 |
*p++ = '\0';
|
|
987 |
|
|
988 |
s->port = p;
|
|
989 |
p = strchr(p, ':');
|
|
990 |
*p++ = '\0';
|
|
991 |
} else {
|
|
992 |
s->addr = NULL;
|
|
993 |
s->port = 0;
|
|
994 |
}
|
|
995 |
|
|
996 |
strncpy(vdi, p, SD_MAX_VDI_LEN);
|
|
997 |
|
|
998 |
p = strchr(vdi, ':');
|
|
999 |
if (p) {
|
|
1000 |
*p++ = '\0';
|
|
1001 |
*snapid = strtoul(p, NULL, 10);
|
|
1002 |
if (*snapid == 0) {
|
|
1003 |
strncpy(tag, p, SD_MAX_VDI_TAG_LEN);
|
|
1004 |
}
|
|
1005 |
} else {
|
|
1006 |
*snapid = CURRENT_VDI_ID; /* search current vdi */
|
|
1007 |
}
|
|
1008 |
|
|
1009 |
if (s->addr == NULL) {
|
|
1010 |
qemu_free(q);
|
|
1011 |
}
|
|
1012 |
|
|
1013 |
return 0;
|
|
1014 |
}
|
|
1015 |
|
|
1016 |
static int find_vdi_name(BDRVSheepdogState *s, char *filename, uint32_t snapid,
|
|
1017 |
char *tag, uint32_t *vid, int for_snapshot)
|
|
1018 |
{
|
|
1019 |
int ret, fd;
|
|
1020 |
SheepdogVdiReq hdr;
|
|
1021 |
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
1022 |
unsigned int wlen, rlen = 0;
|
|
1023 |
char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN];
|
|
1024 |
|
|
1025 |
fd = connect_to_sdog(s->addr, s->port);
|
|
1026 |
if (fd < 0) {
|
|
1027 |
return -1;
|
|
1028 |
}
|
|
1029 |
|
|
1030 |
memset(buf, 0, sizeof(buf));
|
|
1031 |
strncpy(buf, filename, SD_MAX_VDI_LEN);
|
|
1032 |
strncpy(buf + SD_MAX_VDI_LEN, tag, SD_MAX_VDI_TAG_LEN);
|
|
1033 |
|
|
1034 |
memset(&hdr, 0, sizeof(hdr));
|
|
1035 |
if (for_snapshot) {
|
|
1036 |
hdr.opcode = SD_OP_GET_VDI_INFO;
|
|
1037 |
} else {
|
|
1038 |
hdr.opcode = SD_OP_LOCK_VDI;
|
|
1039 |
}
|
|
1040 |
wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN;
|
|
1041 |
hdr.proto_ver = SD_PROTO_VER;
|
|
1042 |
hdr.data_length = wlen;
|
|
1043 |
hdr.snapid = snapid;
|
|
1044 |
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
1045 |
|
|
1046 |
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
1047 |
if (ret) {
|
|
1048 |
ret = -1;
|
|
1049 |
goto out;
|
|
1050 |
}
|
|
1051 |
|
|
1052 |
if (rsp->result != SD_RES_SUCCESS) {
|
|
1053 |
error_report("cannot get vdi info, %s, %s %d %s\n",
|
|
1054 |
sd_strerror(rsp->result), filename, snapid, tag);
|
|
1055 |
ret = -1;
|
|
1056 |
goto out;
|
|
1057 |
}
|
|
1058 |
*vid = rsp->vdi_id;
|
|
1059 |
|
|
1060 |
ret = 0;
|
|
1061 |
out:
|
|
1062 |
closesocket(fd);
|
|
1063 |
return ret;
|
|
1064 |
}
|
|
1065 |
|
|
1066 |
static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
|
|
1067 |
struct iovec *iov, int niov, int create,
|
|
1068 |
enum AIOCBState aiocb_type)
|
|
1069 |
{
|
|
1070 |
int nr_copies = s->inode.nr_copies;
|
|
1071 |
SheepdogObjReq hdr;
|
|
1072 |
unsigned int wlen;
|
|
1073 |
int ret;
|
|
1074 |
uint64_t oid = aio_req->oid;
|
|
1075 |
unsigned int datalen = aio_req->data_len;
|
|
1076 |
uint64_t offset = aio_req->offset;
|
|
1077 |
uint8_t flags = aio_req->flags;
|
|
1078 |
uint64_t old_oid = aio_req->base_oid;
|
|
1079 |
|
|
1080 |
if (!nr_copies) {
|
|
1081 |
error_report("bug\n");
|
|
1082 |
}
|
|
1083 |
|
|
1084 |
memset(&hdr, 0, sizeof(hdr));
|
|
1085 |
|
|
1086 |
if (aiocb_type == AIOCB_READ_UDATA) {
|
|
1087 |
wlen = 0;
|
|
1088 |
hdr.opcode = SD_OP_READ_OBJ;
|
|
1089 |
hdr.flags = flags;
|
|
1090 |
} else if (create) {
|
|
1091 |
wlen = datalen;
|
|
1092 |
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ;
|
|
1093 |
hdr.flags = SD_FLAG_CMD_WRITE | flags;
|
|
1094 |
} else {
|
|
1095 |
wlen = datalen;
|
|
1096 |
hdr.opcode = SD_OP_WRITE_OBJ;
|
|
1097 |
hdr.flags = SD_FLAG_CMD_WRITE | flags;
|
|
1098 |
}
|
|
1099 |
|
|
1100 |
hdr.oid = oid;
|
|
1101 |
hdr.cow_oid = old_oid;
|
|
1102 |
hdr.copies = s->inode.nr_copies;
|
|
1103 |
|
|
1104 |
hdr.data_length = datalen;
|
|
1105 |
hdr.offset = offset;
|
|
1106 |
|
|
1107 |
hdr.id = aio_req->id;
|
|
1108 |
|
|
1109 |
set_cork(s->fd, 1);
|
|
1110 |
|
|
1111 |
/* send a header */
|
|
1112 |
ret = do_write(s->fd, &hdr, sizeof(hdr));
|
|
1113 |
if (ret) {
|
|
1114 |
error_report("failed to send a req, %s\n", strerror(errno));
|
|
1115 |
return -EIO;
|
|
1116 |
}
|
|
1117 |
|
|
1118 |
if (wlen) {
|
|
1119 |
ret = do_writev(s->fd, iov, wlen, aio_req->iov_offset);
|
|
1120 |
if (ret) {
|
|
1121 |
error_report("failed to send a data, %s\n", strerror(errno));
|
|
1122 |
return -EIO;
|
|
1123 |
}
|
|
1124 |
}
|
|
1125 |
|
|
1126 |
set_cork(s->fd, 0);
|
|
1127 |
|
|
1128 |
return 0;
|
|
1129 |
}
|
|
1130 |
|
|
1131 |
static int read_write_object(int fd, char *buf, uint64_t oid, int copies,
|
|
1132 |
unsigned int datalen, uint64_t offset,
|
|
1133 |
int write, int create)
|
|
1134 |
{
|
|
1135 |
SheepdogObjReq hdr;
|
|
1136 |
SheepdogObjRsp *rsp = (SheepdogObjRsp *)&hdr;
|
|
1137 |
unsigned int wlen, rlen;
|
|
1138 |
int ret;
|
|
1139 |
|
|
1140 |
memset(&hdr, 0, sizeof(hdr));
|
|
1141 |
|
|
1142 |
if (write) {
|
|
1143 |
wlen = datalen;
|
|
1144 |
rlen = 0;
|
|
1145 |
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
1146 |
if (create) {
|
|
1147 |
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ;
|
|
1148 |
} else {
|
|
1149 |
hdr.opcode = SD_OP_WRITE_OBJ;
|
|
1150 |
}
|
|
1151 |
} else {
|
|
1152 |
wlen = 0;
|
|
1153 |
rlen = datalen;
|
|
1154 |
hdr.opcode = SD_OP_READ_OBJ;
|
|
1155 |
}
|
|
1156 |
hdr.oid = oid;
|
|
1157 |
hdr.data_length = datalen;
|
|
1158 |
hdr.offset = offset;
|
|
1159 |
hdr.copies = copies;
|
|
1160 |
|
|
1161 |
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
1162 |
if (ret) {
|
|
1163 |
error_report("failed to send a request to the sheep\n");
|
|
1164 |
return -1;
|
|
1165 |
}
|
|
1166 |
|
|
1167 |
switch (rsp->result) {
|
|
1168 |
case SD_RES_SUCCESS:
|
|
1169 |
return 0;
|
|
1170 |
default:
|
|
1171 |
error_report("%s\n", sd_strerror(rsp->result));
|
|
1172 |
return -1;
|
|
1173 |
}
|
|
1174 |
}
|
|
1175 |
|
|
1176 |
static int read_object(int fd, char *buf, uint64_t oid, int copies,
|
|
1177 |
unsigned int datalen, uint64_t offset)
|
|
1178 |
{
|
|
1179 |
return read_write_object(fd, buf, oid, copies, datalen, offset, 0, 0);
|
|
1180 |
}
|
|
1181 |
|
|
1182 |
static int write_object(int fd, char *buf, uint64_t oid, int copies,
|
|
1183 |
unsigned int datalen, uint64_t offset, int create)
|
|
1184 |
{
|
|
1185 |
return read_write_object(fd, buf, oid, copies, datalen, offset, 1, create);
|
|
1186 |
}
|
|
1187 |
|
|
1188 |
static int sd_open(BlockDriverState *bs, const char *filename, int flags)
|
|
1189 |
{
|
|
1190 |
int ret, fd;
|
|
1191 |
uint32_t vid = 0;
|
|
1192 |
BDRVSheepdogState *s = bs->opaque;
|
|
1193 |
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
|
|
1194 |
uint32_t snapid;
|
|
1195 |
char *buf = NULL;
|
|
1196 |
|
|
1197 |
strstart(filename, "sheepdog:", (const char **)&filename);
|
|
1198 |
|
|
1199 |
QLIST_INIT(&s->outstanding_aio_head);
|
|
1200 |
s->fd = -1;
|
|
1201 |
|
|
1202 |
memset(vdi, 0, sizeof(vdi));
|
|
1203 |
memset(tag, 0, sizeof(tag));
|
|
1204 |
if (parse_vdiname(s, filename, vdi, &snapid, tag) < 0) {
|
|
1205 |
goto out;
|
|
1206 |
}
|
|
1207 |
s->fd = get_sheep_fd(s);
|
|
1208 |
if (s->fd < 0) {
|
|
1209 |
goto out;
|
|
1210 |
}
|
|
1211 |
|
|
1212 |
ret = find_vdi_name(s, vdi, snapid, tag, &vid, 0);
|
|
1213 |
if (ret) {
|
|
1214 |
goto out;
|
|
1215 |
}
|
|
1216 |
|
|
1217 |
if (snapid) {
|
|
1218 |
dprintf("%" PRIx32 " snapshot inode was open.\n", vid);
|
|
1219 |
s->is_snapshot = 1;
|
|
1220 |
}
|
|
1221 |
|
|
1222 |
fd = connect_to_sdog(s->addr, s->port);
|
|
1223 |
if (fd < 0) {
|
|
1224 |
error_report("failed to connect\n");
|
|
1225 |
goto out;
|
|
1226 |
}
|
|
1227 |
|
|
1228 |
buf = qemu_malloc(SD_INODE_SIZE);
|
|
1229 |
ret = read_object(fd, buf, vid_to_vdi_oid(vid), 0, SD_INODE_SIZE, 0);
|
|
1230 |
|
|
1231 |
closesocket(fd);
|
|
1232 |
|
|
1233 |
if (ret) {
|
|
1234 |
goto out;
|
|
1235 |
}
|
|
1236 |
|
|
1237 |
memcpy(&s->inode, buf, sizeof(s->inode));
|
|
1238 |
s->min_dirty_data_idx = UINT32_MAX;
|
|
1239 |
s->max_dirty_data_idx = 0;
|
|
1240 |
|
|
1241 |
bs->total_sectors = s->inode.vdi_size / SECTOR_SIZE;
|
|
1242 |
strncpy(s->name, vdi, sizeof(s->name));
|
|
1243 |
qemu_free(buf);
|
|
1244 |
return 0;
|
|
1245 |
out:
|
|
1246 |
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL);
|
|
1247 |
if (s->fd >= 0) {
|
|
1248 |
closesocket(s->fd);
|
|
1249 |
}
|
|
1250 |
qemu_free(buf);
|
|
1251 |
return -1;
|
|
1252 |
}
|
|
1253 |
|
|
1254 |
static int do_sd_create(char *filename, int64_t vdi_size,
|
|
1255 |
uint32_t base_vid, uint32_t *vdi_id, int snapshot,
|
|
1256 |
const char *addr, const char *port)
|
|
1257 |
{
|
|
1258 |
SheepdogVdiReq hdr;
|
|
1259 |
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
1260 |
int fd, ret;
|
|
1261 |
unsigned int wlen, rlen = 0;
|
|
1262 |
char buf[SD_MAX_VDI_LEN];
|
|
1263 |
|
|
1264 |
fd = connect_to_sdog(addr, port);
|
|
1265 |
if (fd < 0) {
|
|
1266 |
return -EIO;
|
|
1267 |
}
|
|
1268 |
|
|
1269 |
memset(buf, 0, sizeof(buf));
|
|
1270 |
strncpy(buf, filename, SD_MAX_VDI_LEN);
|
|
1271 |
|
|
1272 |
memset(&hdr, 0, sizeof(hdr));
|
|
1273 |
hdr.opcode = SD_OP_NEW_VDI;
|
|
1274 |
hdr.base_vdi_id = base_vid;
|
|
1275 |
|
|
1276 |
wlen = SD_MAX_VDI_LEN;
|
|
1277 |
|
|
1278 |
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
1279 |
hdr.snapid = snapshot;
|
|
1280 |
|
|
1281 |
hdr.data_length = wlen;
|
|
1282 |
hdr.vdi_size = vdi_size;
|
|
1283 |
|
|
1284 |
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
1285 |
|
|
1286 |
closesocket(fd);
|
|
1287 |
|
|
1288 |
if (ret) {
|
|
1289 |
return -EIO;
|
|
1290 |
}
|
|
1291 |
|
|
1292 |
if (rsp->result != SD_RES_SUCCESS) {
|
|
1293 |
error_report("%s, %s\n", sd_strerror(rsp->result), filename);
|
|
1294 |
return -EIO;
|
|
1295 |
}
|
|
1296 |
|
|
1297 |
if (vdi_id) {
|
|
1298 |
*vdi_id = rsp->vdi_id;
|
|
1299 |
}
|
|
1300 |
|
|
1301 |
return 0;
|
|
1302 |
}
|
|
1303 |
|
|
1304 |
static int sd_create(const char *filename, QEMUOptionParameter *options)
|
|
1305 |
{
|
|
1306 |
int ret;
|
|
1307 |
uint32_t vid = 0;
|
|
1308 |
int64_t vdi_size = 0;
|
|
1309 |
char *backing_file = NULL;
|
|
1310 |
|
|
1311 |
strstart(filename, "sheepdog:", (const char **)&filename);
|
|
1312 |
|
|
1313 |
while (options && options->name) {
|
|
1314 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
|
1315 |
vdi_size = options->value.n;
|
|
1316 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
|
|
1317 |
backing_file = options->value.s;
|
|
1318 |
}
|
|
1319 |
options++;
|
|
1320 |
}
|
|
1321 |
|
|
1322 |
if (vdi_size > SD_MAX_VDI_SIZE) {
|
|
1323 |
error_report("too big image size\n");
|
|
1324 |
return -EINVAL;
|
|
1325 |
}
|
|
1326 |
|
|
1327 |
if (backing_file) {
|
|
1328 |
BlockDriverState *bs;
|
|
1329 |
BDRVSheepdogState *s;
|
|
1330 |
BlockDriver *drv;
|
|
1331 |
|
|
1332 |
/* Currently, only Sheepdog backing image is supported. */
|
|
1333 |
drv = bdrv_find_protocol(backing_file);
|
|
1334 |
if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) {
|
|
1335 |
error_report("backing_file must be a sheepdog image\n");
|
|
1336 |
return -EINVAL;
|
|
1337 |
}
|
|
1338 |
|
|
1339 |
ret = bdrv_file_open(&bs, backing_file, 0);
|
|
1340 |
if (ret < 0)
|
|
1341 |
return -EIO;
|
|
1342 |
|
|
1343 |
s = bs->opaque;
|
|
1344 |
|
|
1345 |
if (!is_snapshot(&s->inode)) {
|
|
1346 |
error_report("cannot clone from a non snapshot vdi\n");
|
|
1347 |
bdrv_delete(bs);
|
|
1348 |
return -EINVAL;
|
|
1349 |
}
|
|
1350 |
|
|
1351 |
vid = s->inode.vdi_id;
|
|
1352 |
bdrv_delete(bs);
|
|
1353 |
}
|
|
1354 |
|
|
1355 |
return do_sd_create((char *)filename, vdi_size, vid, NULL, 0, NULL, NULL);
|
|
1356 |
}
|
|
1357 |
|
|
1358 |
static void sd_close(BlockDriverState *bs)
|
|
1359 |
{
|
|
1360 |
BDRVSheepdogState *s = bs->opaque;
|
|
1361 |
SheepdogVdiReq hdr;
|
|
1362 |
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
1363 |
unsigned int wlen, rlen = 0;
|
|
1364 |
int fd, ret;
|
|
1365 |
|
|
1366 |
dprintf("%s\n", s->name);
|
|
1367 |
|
|
1368 |
fd = connect_to_sdog(s->addr, s->port);
|
|
1369 |
if (fd < 0) {
|
|
1370 |
return;
|
|
1371 |
}
|
|
1372 |
|
|
1373 |
memset(&hdr, 0, sizeof(hdr));
|
|
1374 |
|
|
1375 |
hdr.opcode = SD_OP_RELEASE_VDI;
|
|
1376 |
wlen = strlen(s->name) + 1;
|
|
1377 |
hdr.data_length = wlen;
|
|
1378 |
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
1379 |
|
|
1380 |
ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen);
|
|
1381 |
|
|
1382 |
closesocket(fd);
|
|
1383 |
|
|
1384 |
if (!ret && rsp->result != SD_RES_SUCCESS &&
|
|
1385 |
rsp->result != SD_RES_VDI_NOT_LOCKED) {
|
|
1386 |
error_report("%s, %s\n", sd_strerror(rsp->result), s->name);
|
|
1387 |
}
|
|
1388 |
|
|
1389 |
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL);
|
|
1390 |
closesocket(s->fd);
|
|
1391 |
qemu_free(s->addr);
|
|
1392 |
}
|
|
1393 |
|
|
1394 |
static int64_t sd_getlength(BlockDriverState *bs)
|
|
1395 |
{
|
|
1396 |
BDRVSheepdogState *s = bs->opaque;
|
|
1397 |
|
|
1398 |
return s->inode.vdi_size;
|
|
1399 |
}
|
|
1400 |
|
|
1401 |
static int sd_truncate(BlockDriverState *bs, int64_t offset)
|
|
1402 |
{
|
|
1403 |
BDRVSheepdogState *s = bs->opaque;
|
|
1404 |
int ret, fd;
|
|
1405 |
unsigned int datalen;
|
|
1406 |
|
|
1407 |
if (offset < s->inode.vdi_size) {
|
|
1408 |
error_report("shrinking is not supported\n");
|
|
1409 |
return -EINVAL;
|
|
1410 |
} else if (offset > SD_MAX_VDI_SIZE) {
|
|
1411 |
error_report("too big image size\n");
|
|
1412 |
return -EINVAL;
|
|
1413 |
}
|
|
1414 |
|
|
1415 |
fd = connect_to_sdog(s->addr, s->port);
|
|
1416 |
if (fd < 0) {
|
|
1417 |
return -EIO;
|
|
1418 |
}
|
|
1419 |
|
|
1420 |
/* we don't need to update entire object */
|
|
1421 |
datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
|
|
1422 |
s->inode.vdi_size = offset;
|
|
1423 |
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
|
|
1424 |
s->inode.nr_copies, datalen, 0, 0);
|
|
1425 |
close(fd);
|
|
1426 |
|
|
1427 |
if (ret < 0) {
|
|
1428 |
error_report("failed to update an inode.\n");
|
|
1429 |
return -EIO;
|
|
1430 |
}
|
|
1431 |
|
|
1432 |
return 0;
|
|
1433 |
}
|
|
1434 |
|
|
1435 |
/*
|
|
1436 |
* This function is called after writing data objects. If we need to
|
|
1437 |
* update metadata, this sends a write request to the vdi object.
|
|
1438 |
* Otherwise, this calls the AIOCB callback.
|
|
1439 |
*/
|
|
1440 |
static void sd_write_done(SheepdogAIOCB *acb)
|
|
1441 |
{
|
|
1442 |
int ret;
|
|
1443 |
BDRVSheepdogState *s = acb->common.bs->opaque;
|
|
1444 |
struct iovec iov;
|
|
1445 |
AIOReq *aio_req;
|
|
1446 |
uint32_t offset, data_len, mn, mx;
|
|
1447 |
|
|
1448 |
mn = s->min_dirty_data_idx;
|
|
1449 |
mx = s->max_dirty_data_idx;
|
|
1450 |
if (mn <= mx) {
|
|
1451 |
/* we need to update the vdi object. */
|
|
1452 |
offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) +
|
|
1453 |
mn * sizeof(s->inode.data_vdi_id[0]);
|
|
1454 |
data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]);
|
|
1455 |
|
|
1456 |
s->min_dirty_data_idx = UINT32_MAX;
|