Replace writeable -> writable Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2025 lines
52 KiB
C
2025 lines
52 KiB
C
/*
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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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#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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#include "bitops.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_writable(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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QLIST_INSERT_HEAD(&s->outstanding_aio_head, aio_req,
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outstanding_aio_siblings);
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QLIST_INSERT_HEAD(&acb->aioreq_head, aio_req, aioreq_siblings);
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return aio_req;
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}
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static inline int free_aio_req(BDRVSheepdogState *s, AIOReq *aio_req)
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{
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SheepdogAIOCB *acb = aio_req->aiocb;
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QLIST_REMOVE(aio_req, outstanding_aio_siblings);
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QLIST_REMOVE(aio_req, aioreq_siblings);
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qemu_free(aio_req);
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return !QLIST_EMPTY(&acb->aioreq_head);
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}
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static void sd_finish_aiocb(SheepdogAIOCB *acb)
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{
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if (!acb->canceled) {
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acb->common.cb(acb->common.opaque, acb->ret);
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}
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qemu_aio_release(acb);
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}
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static void sd_aio_cancel(BlockDriverAIOCB *blockacb)
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{
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SheepdogAIOCB *acb = (SheepdogAIOCB *)blockacb;
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/*
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* Sheepdog cannot cancel the requests which are already sent to
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* the servers, so we just complete the request with -EIO here.
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*/
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acb->common.cb(acb->common.opaque, -EIO);
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acb->canceled = 1;
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}
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static AIOPool sd_aio_pool = {
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.aiocb_size = sizeof(SheepdogAIOCB),
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.cancel = sd_aio_cancel,
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};
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static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
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int64_t sector_num, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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SheepdogAIOCB *acb;
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acb = qemu_aio_get(&sd_aio_pool, bs, cb, opaque);
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acb->qiov = qiov;
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acb->sector_num = sector_num;
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acb->nb_sectors = nb_sectors;
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acb->aio_done_func = NULL;
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acb->canceled = 0;
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acb->bh = NULL;
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acb->ret = 0;
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QLIST_INIT(&acb->aioreq_head);
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return acb;
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}
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static int sd_schedule_bh(QEMUBHFunc *cb, SheepdogAIOCB *acb)
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{
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if (acb->bh) {
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error_report("bug: %d %d\n", acb->aiocb_type, acb->aiocb_type);
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return -EIO;
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}
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acb->bh = qemu_bh_new(cb, acb);
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if (!acb->bh) {
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error_report("oom: %d %d\n", acb->aiocb_type, acb->aiocb_type);
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return -EIO;
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}
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qemu_bh_schedule(acb->bh);
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return 0;
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}
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#ifdef _WIN32
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struct msghdr {
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struct iovec *msg_iov;
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size_t msg_iovlen;
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};
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static ssize_t sendmsg(int s, const struct msghdr *msg, int flags)
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{
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size_t size = 0;
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char *buf, *p;
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int i, ret;
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/* count the msg size */
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for (i = 0; i < msg->msg_iovlen; i++) {
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size += msg->msg_iov[i].iov_len;
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}
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buf = qemu_malloc(size);
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p = buf;
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for (i = 0; i < msg->msg_iovlen; i++) {
|
|
memcpy(p, msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len);
|
|
p += msg->msg_iov[i].iov_len;
|
|
}
|
|
|
|
ret = send(s, buf, size, flags);
|
|
|
|
qemu_free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t recvmsg(int s, struct msghdr *msg, int flags)
|
|
{
|
|
size_t size = 0;
|
|
char *buf, *p;
|
|
int i, ret;
|
|
|
|
/* count the msg size */
|
|
for (i = 0; i < msg->msg_iovlen; i++) {
|
|
size += msg->msg_iov[i].iov_len;
|
|
}
|
|
buf = qemu_malloc(size);
|
|
|
|
ret = recv(s, buf, size, flags);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
p = buf;
|
|
for (i = 0; i < msg->msg_iovlen; i++) {
|
|
memcpy(msg->msg_iov[i].iov_base, p, msg->msg_iov[i].iov_len);
|
|
p += msg->msg_iov[i].iov_len;
|
|
}
|
|
out:
|
|
qemu_free(buf);
|
|
return ret;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Send/recv data with iovec buffers
|
|
*
|
|
* This function send/recv data from/to the iovec buffer directly.
|
|
* The first `offset' bytes in the iovec buffer are skipped and next
|
|
* `len' bytes are used.
|
|
*
|
|
* For example,
|
|
*
|
|
* do_send_recv(sockfd, iov, len, offset, 1);
|
|
*
|
|
* is equals to
|
|
*
|
|
* char *buf = malloc(size);
|
|
* iov_to_buf(iov, iovcnt, buf, offset, size);
|
|
* send(sockfd, buf, size, 0);
|
|
* free(buf);
|
|
*/
|
|
static int do_send_recv(int sockfd, struct iovec *iov, int len, int offset,
|
|
int write)
|
|
{
|
|
struct msghdr msg;
|
|
int ret, diff;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.msg_iov = iov;
|
|
msg.msg_iovlen = 1;
|
|
|
|
len += offset;
|
|
|
|
while (iov->iov_len < len) {
|
|
len -= iov->iov_len;
|
|
|
|
iov++;
|
|
msg.msg_iovlen++;
|
|
}
|
|
|
|
diff = iov->iov_len - len;
|
|
iov->iov_len -= diff;
|
|
|
|
while (msg.msg_iov->iov_len <= offset) {
|
|
offset -= msg.msg_iov->iov_len;
|
|
|
|
msg.msg_iov++;
|
|
msg.msg_iovlen--;
|
|
}
|
|
|
|
msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base + offset;
|
|
msg.msg_iov->iov_len -= offset;
|
|
|
|
if (write) {
|
|
ret = sendmsg(sockfd, &msg, 0);
|
|
} else {
|
|
ret = recvmsg(sockfd, &msg, 0);
|
|
}
|
|
|
|
msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base - offset;
|
|
msg.msg_iov->iov_len += offset;
|
|
|
|
iov->iov_len += diff;
|
|
return ret;
|
|
}
|
|
|
|
static int connect_to_sdog(const char *addr, const char *port)
|
|
{
|
|
char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
|
|
int fd, ret;
|
|
struct addrinfo hints, *res, *res0;
|
|
|
|
if (!addr) {
|
|
addr = SD_DEFAULT_ADDR;
|
|
port = SD_DEFAULT_PORT;
|
|
}
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
|
|
ret = getaddrinfo(addr, port, &hints, &res0);
|
|
if (ret) {
|
|
error_report("unable to get address info %s, %s\n",
|
|
addr, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
for (res = res0; res; res = res->ai_next) {
|
|
ret = getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
|
|
sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
|
|
if (ret) {
|
|
continue;
|
|
}
|
|
|
|
fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
|
|
if (fd < 0) {
|
|
continue;
|
|
}
|
|
|
|
reconnect:
|
|
ret = connect(fd, res->ai_addr, res->ai_addrlen);
|
|
if (ret < 0) {
|
|
if (errno == EINTR) {
|
|
goto reconnect;
|
|
}
|
|
break;
|
|
}
|
|
|
|
dprintf("connected to %s:%s\n", addr, port);
|
|
goto success;
|
|
}
|
|
fd = -1;
|
|
error_report("failed connect to %s:%s\n", addr, port);
|
|
success:
|
|
freeaddrinfo(res0);
|
|
return fd;
|
|
}
|
|
|
|
static int do_readv_writev(int sockfd, struct iovec *iov, int len,
|
|
int iov_offset, int write)
|
|
{
|
|
int ret;
|
|
again:
|
|
ret = do_send_recv(sockfd, iov, len, iov_offset, write);
|
|
if (ret < 0) {
|
|
if (errno == EINTR || errno == EAGAIN) {
|
|
goto again;
|
|
}
|
|
error_report("failed to recv a rsp, %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
iov_offset += ret;
|
|
len -= ret;
|
|
if (len) {
|
|
goto again;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int do_readv(int sockfd, struct iovec *iov, int len, int iov_offset)
|
|
{
|
|
return do_readv_writev(sockfd, iov, len, iov_offset, 0);
|
|
}
|
|
|
|
static int do_writev(int sockfd, struct iovec *iov, int len, int iov_offset)
|
|
{
|
|
return do_readv_writev(sockfd, iov, len, iov_offset, 1);
|
|
}
|
|
|
|
static int do_read_write(int sockfd, void *buf, int len, int write)
|
|
{
|
|
struct iovec iov;
|
|
|
|
iov.iov_base = buf;
|
|
iov.iov_len = len;
|
|
|
|
return do_readv_writev(sockfd, &iov, len, 0, write);
|
|
}
|
|
|
|
static int do_read(int sockfd, void *buf, int len)
|
|
{
|
|
return do_read_write(sockfd, buf, len, 0);
|
|
}
|
|
|
|
static int do_write(int sockfd, void *buf, int len)
|
|
{
|
|
return do_read_write(sockfd, buf, len, 1);
|
|
}
|
|
|
|
static int send_req(int sockfd, SheepdogReq *hdr, void *data,
|
|
unsigned int *wlen)
|
|
{
|
|
int ret;
|
|
struct iovec iov[2];
|
|
|
|
iov[0].iov_base = hdr;
|
|
iov[0].iov_len = sizeof(*hdr);
|
|
|
|
if (*wlen) {
|
|
iov[1].iov_base = data;
|
|
iov[1].iov_len = *wlen;
|
|
}
|
|
|
|
ret = do_writev(sockfd, iov, sizeof(*hdr) + *wlen, 0);
|
|
if (ret) {
|
|
error_report("failed to send a req, %s\n", strerror(errno));
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int do_req(int sockfd, SheepdogReq *hdr, void *data,
|
|
unsigned int *wlen, unsigned int *rlen)
|
|
{
|
|
int ret;
|
|
|
|
ret = send_req(sockfd, hdr, data, wlen);
|
|
if (ret) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
ret = do_read(sockfd, hdr, sizeof(*hdr));
|
|
if (ret) {
|
|
error_report("failed to get a rsp, %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (*rlen > hdr->data_length) {
|
|
*rlen = hdr->data_length;
|
|
}
|
|
|
|
if (*rlen) {
|
|
ret = do_read(sockfd, data, *rlen);
|
|
if (ret) {
|
|
error_report("failed to get the data, %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
|
|
struct iovec *iov, int niov, int create,
|
|
enum AIOCBState aiocb_type);
|
|
|
|
/*
|
|
* This function searchs pending requests to the object `oid', and
|
|
* sends them.
|
|
*/
|
|
static void send_pending_req(BDRVSheepdogState *s, uint64_t oid, uint32_t id)
|
|
{
|
|
AIOReq *aio_req, *next;
|
|
SheepdogAIOCB *acb;
|
|
int ret;
|
|
|
|
QLIST_FOREACH_SAFE(aio_req, &s->outstanding_aio_head,
|
|
outstanding_aio_siblings, next) {
|
|
if (id == aio_req->id) {
|
|
continue;
|
|
}
|
|
if (aio_req->oid != oid) {
|
|
continue;
|
|
}
|
|
|
|
acb = aio_req->aiocb;
|
|
ret = add_aio_request(s, aio_req, acb->qiov->iov,
|
|
acb->qiov->niov, 0, acb->aiocb_type);
|
|
if (ret < 0) {
|
|
error_report("add_aio_request is failed\n");
|
|
free_aio_req(s, aio_req);
|
|
if (QLIST_EMPTY(&acb->aioreq_head)) {
|
|
sd_finish_aiocb(acb);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Receive responses of the I/O requests.
|
|
*
|
|
* This function is registered as a fd handler, and called from the
|
|
* main loop when s->fd is ready for reading responses.
|
|
*/
|
|
static void aio_read_response(void *opaque)
|
|
{
|
|
SheepdogObjRsp rsp;
|
|
BDRVSheepdogState *s = opaque;
|
|
int fd = s->fd;
|
|
int ret;
|
|
AIOReq *aio_req = NULL;
|
|
SheepdogAIOCB *acb;
|
|
int rest;
|
|
unsigned long idx;
|
|
|
|
if (QLIST_EMPTY(&s->outstanding_aio_head)) {
|
|
return;
|
|
}
|
|
|
|
/* read a header */
|
|
ret = do_read(fd, &rsp, sizeof(rsp));
|
|
if (ret) {
|
|
error_report("failed to get the header, %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
|
|
/* find the right aio_req from the outstanding_aio list */
|
|
QLIST_FOREACH(aio_req, &s->outstanding_aio_head, outstanding_aio_siblings) {
|
|
if (aio_req->id == rsp.id) {
|
|
break;
|
|
}
|
|
}
|
|
if (!aio_req) {
|
|
error_report("cannot find aio_req %x\n", rsp.id);
|
|
return;
|
|
}
|
|
|
|
acb = aio_req->aiocb;
|
|
|
|
switch (acb->aiocb_type) {
|
|
case AIOCB_WRITE_UDATA:
|
|
if (!is_data_obj(aio_req->oid)) {
|
|
break;
|
|
}
|
|
idx = data_oid_to_idx(aio_req->oid);
|
|
|
|
if (s->inode.data_vdi_id[idx] != s->inode.vdi_id) {
|
|
/*
|
|
* If the object is newly created one, we need to update
|
|
* the vdi object (metadata object). min_dirty_data_idx
|
|
* and max_dirty_data_idx are changed to include updated
|
|
* index between them.
|
|
*/
|
|
s->inode.data_vdi_id[idx] = s->inode.vdi_id;
|
|
s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx);
|
|
s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx);
|
|
|
|
/*
|
|
* Some requests may be blocked because simultaneous
|
|
* create requests are not allowed, so we search the
|
|
* pending requests here.
|
|
*/
|
|
send_pending_req(s, vid_to_data_oid(s->inode.vdi_id, idx), rsp.id);
|
|
}
|
|
break;
|
|
case AIOCB_READ_UDATA:
|
|
ret = do_readv(fd, acb->qiov->iov, rsp.data_length,
|
|
aio_req->iov_offset);
|
|
if (ret) {
|
|
error_report("failed to get the data, %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (rsp.result != SD_RES_SUCCESS) {
|
|
acb->ret = -EIO;
|
|
error_report("%s\n", sd_strerror(rsp.result));
|
|
}
|
|
|
|
rest = free_aio_req(s, aio_req);
|
|
if (!rest) {
|
|
/*
|
|
* We've finished all requests which belong to the AIOCB, so
|
|
* we can call the callback now.
|
|
*/
|
|
acb->aio_done_func(acb);
|
|
}
|
|
}
|
|
|
|
static int aio_flush_request(void *opaque)
|
|
{
|
|
BDRVSheepdogState *s = opaque;
|
|
|
|
return !QLIST_EMPTY(&s->outstanding_aio_head);
|
|
}
|
|
|
|
#if !defined(SOL_TCP) || !defined(TCP_CORK)
|
|
|
|
static int set_cork(int fd, int v)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static int set_cork(int fd, int v)
|
|
{
|
|
return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
|
|
}
|
|
|
|
#endif
|
|
|
|
static int set_nodelay(int fd)
|
|
{
|
|
int ret, opt;
|
|
|
|
opt = 1;
|
|
ret = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt));
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Return a socket discriptor to read/write objects.
|
|
*
|
|
* We cannot use this discriptor for other operations because
|
|
* the block driver may be on waiting response from the server.
|
|
*/
|
|
static int get_sheep_fd(BDRVSheepdogState *s)
|
|
{
|
|
int ret, fd;
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
error_report("%s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
socket_set_nonblock(fd);
|
|
|
|
ret = set_nodelay(fd);
|
|
if (ret) {
|
|
error_report("%s\n", strerror(errno));
|
|
closesocket(fd);
|
|
return -1;
|
|
}
|
|
|
|
qemu_aio_set_fd_handler(fd, aio_read_response, NULL, aio_flush_request,
|
|
NULL, s);
|
|
return fd;
|
|
}
|
|
|
|
/*
|
|
* Parse a filename
|
|
*
|
|
* filename must be one of the following formats:
|
|
* 1. [vdiname]
|
|
* 2. [vdiname]:[snapid]
|
|
* 3. [vdiname]:[tag]
|
|
* 4. [hostname]:[port]:[vdiname]
|
|
* 5. [hostname]:[port]:[vdiname]:[snapid]
|
|
* 6. [hostname]:[port]:[vdiname]:[tag]
|
|
*
|
|
* You can boot from the snapshot images by specifying `snapid` or
|
|
* `tag'.
|
|
*
|
|
* You can run VMs outside the Sheepdog cluster by specifying
|
|
* `hostname' and `port' (experimental).
|
|
*/
|
|
static int parse_vdiname(BDRVSheepdogState *s, const char *filename,
|
|
char *vdi, uint32_t *snapid, char *tag)
|
|
{
|
|
char *p, *q;
|
|
int nr_sep;
|
|
|
|
p = q = qemu_strdup(filename);
|
|
|
|
/* count the number of separators */
|
|
nr_sep = 0;
|
|
while (*p) {
|
|
if (*p == ':') {
|
|
nr_sep++;
|
|
}
|
|
p++;
|
|
}
|
|
p = q;
|
|
|
|
/* use the first two tokens as hostname and port number. */
|
|
if (nr_sep >= 2) {
|
|
s->addr = p;
|
|
p = strchr(p, ':');
|
|
*p++ = '\0';
|
|
|
|
s->port = p;
|
|
p = strchr(p, ':');
|
|
*p++ = '\0';
|
|
} else {
|
|
s->addr = NULL;
|
|
s->port = 0;
|
|
}
|
|
|
|
strncpy(vdi, p, SD_MAX_VDI_LEN);
|
|
|
|
p = strchr(vdi, ':');
|
|
if (p) {
|
|
*p++ = '\0';
|
|
*snapid = strtoul(p, NULL, 10);
|
|
if (*snapid == 0) {
|
|
strncpy(tag, p, SD_MAX_VDI_TAG_LEN);
|
|
}
|
|
} else {
|
|
*snapid = CURRENT_VDI_ID; /* search current vdi */
|
|
}
|
|
|
|
if (s->addr == NULL) {
|
|
qemu_free(q);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int find_vdi_name(BDRVSheepdogState *s, char *filename, uint32_t snapid,
|
|
char *tag, uint32_t *vid, int for_snapshot)
|
|
{
|
|
int ret, fd;
|
|
SheepdogVdiReq hdr;
|
|
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
unsigned int wlen, rlen = 0;
|
|
char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN];
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
return -1;
|
|
}
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
strncpy(buf, filename, SD_MAX_VDI_LEN);
|
|
strncpy(buf + SD_MAX_VDI_LEN, tag, SD_MAX_VDI_TAG_LEN);
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
if (for_snapshot) {
|
|
hdr.opcode = SD_OP_GET_VDI_INFO;
|
|
} else {
|
|
hdr.opcode = SD_OP_LOCK_VDI;
|
|
}
|
|
wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN;
|
|
hdr.proto_ver = SD_PROTO_VER;
|
|
hdr.data_length = wlen;
|
|
hdr.snapid = snapid;
|
|
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
|
|
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
if (ret) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (rsp->result != SD_RES_SUCCESS) {
|
|
error_report("cannot get vdi info, %s, %s %d %s\n",
|
|
sd_strerror(rsp->result), filename, snapid, tag);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
*vid = rsp->vdi_id;
|
|
|
|
ret = 0;
|
|
out:
|
|
closesocket(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
|
|
struct iovec *iov, int niov, int create,
|
|
enum AIOCBState aiocb_type)
|
|
{
|
|
int nr_copies = s->inode.nr_copies;
|
|
SheepdogObjReq hdr;
|
|
unsigned int wlen;
|
|
int ret;
|
|
uint64_t oid = aio_req->oid;
|
|
unsigned int datalen = aio_req->data_len;
|
|
uint64_t offset = aio_req->offset;
|
|
uint8_t flags = aio_req->flags;
|
|
uint64_t old_oid = aio_req->base_oid;
|
|
|
|
if (!nr_copies) {
|
|
error_report("bug\n");
|
|
}
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
|
|
if (aiocb_type == AIOCB_READ_UDATA) {
|
|
wlen = 0;
|
|
hdr.opcode = SD_OP_READ_OBJ;
|
|
hdr.flags = flags;
|
|
} else if (create) {
|
|
wlen = datalen;
|
|
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ;
|
|
hdr.flags = SD_FLAG_CMD_WRITE | flags;
|
|
} else {
|
|
wlen = datalen;
|
|
hdr.opcode = SD_OP_WRITE_OBJ;
|
|
hdr.flags = SD_FLAG_CMD_WRITE | flags;
|
|
}
|
|
|
|
hdr.oid = oid;
|
|
hdr.cow_oid = old_oid;
|
|
hdr.copies = s->inode.nr_copies;
|
|
|
|
hdr.data_length = datalen;
|
|
hdr.offset = offset;
|
|
|
|
hdr.id = aio_req->id;
|
|
|
|
set_cork(s->fd, 1);
|
|
|
|
/* send a header */
|
|
ret = do_write(s->fd, &hdr, sizeof(hdr));
|
|
if (ret) {
|
|
error_report("failed to send a req, %s\n", strerror(errno));
|
|
return -EIO;
|
|
}
|
|
|
|
if (wlen) {
|
|
ret = do_writev(s->fd, iov, wlen, aio_req->iov_offset);
|
|
if (ret) {
|
|
error_report("failed to send a data, %s\n", strerror(errno));
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
set_cork(s->fd, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_write_object(int fd, char *buf, uint64_t oid, int copies,
|
|
unsigned int datalen, uint64_t offset,
|
|
int write, int create)
|
|
{
|
|
SheepdogObjReq hdr;
|
|
SheepdogObjRsp *rsp = (SheepdogObjRsp *)&hdr;
|
|
unsigned int wlen, rlen;
|
|
int ret;
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
|
|
if (write) {
|
|
wlen = datalen;
|
|
rlen = 0;
|
|
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
if (create) {
|
|
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ;
|
|
} else {
|
|
hdr.opcode = SD_OP_WRITE_OBJ;
|
|
}
|
|
} else {
|
|
wlen = 0;
|
|
rlen = datalen;
|
|
hdr.opcode = SD_OP_READ_OBJ;
|
|
}
|
|
hdr.oid = oid;
|
|
hdr.data_length = datalen;
|
|
hdr.offset = offset;
|
|
hdr.copies = copies;
|
|
|
|
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
if (ret) {
|
|
error_report("failed to send a request to the sheep\n");
|
|
return -1;
|
|
}
|
|
|
|
switch (rsp->result) {
|
|
case SD_RES_SUCCESS:
|
|
return 0;
|
|
default:
|
|
error_report("%s\n", sd_strerror(rsp->result));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int read_object(int fd, char *buf, uint64_t oid, int copies,
|
|
unsigned int datalen, uint64_t offset)
|
|
{
|
|
return read_write_object(fd, buf, oid, copies, datalen, offset, 0, 0);
|
|
}
|
|
|
|
static int write_object(int fd, char *buf, uint64_t oid, int copies,
|
|
unsigned int datalen, uint64_t offset, int create)
|
|
{
|
|
return read_write_object(fd, buf, oid, copies, datalen, offset, 1, create);
|
|
}
|
|
|
|
static int sd_open(BlockDriverState *bs, const char *filename, int flags)
|
|
{
|
|
int ret, fd;
|
|
uint32_t vid = 0;
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
|
|
uint32_t snapid;
|
|
char *buf = NULL;
|
|
|
|
strstart(filename, "sheepdog:", (const char **)&filename);
|
|
|
|
QLIST_INIT(&s->outstanding_aio_head);
|
|
s->fd = -1;
|
|
|
|
memset(vdi, 0, sizeof(vdi));
|
|
memset(tag, 0, sizeof(tag));
|
|
if (parse_vdiname(s, filename, vdi, &snapid, tag) < 0) {
|
|
goto out;
|
|
}
|
|
s->fd = get_sheep_fd(s);
|
|
if (s->fd < 0) {
|
|
goto out;
|
|
}
|
|
|
|
ret = find_vdi_name(s, vdi, snapid, tag, &vid, 0);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
if (snapid) {
|
|
dprintf("%" PRIx32 " snapshot inode was open.\n", vid);
|
|
s->is_snapshot = 1;
|
|
}
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
error_report("failed to connect\n");
|
|
goto out;
|
|
}
|
|
|
|
buf = qemu_malloc(SD_INODE_SIZE);
|
|
ret = read_object(fd, buf, vid_to_vdi_oid(vid), 0, SD_INODE_SIZE, 0);
|
|
|
|
closesocket(fd);
|
|
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&s->inode, buf, sizeof(s->inode));
|
|
s->min_dirty_data_idx = UINT32_MAX;
|
|
s->max_dirty_data_idx = 0;
|
|
|
|
bs->total_sectors = s->inode.vdi_size / SECTOR_SIZE;
|
|
strncpy(s->name, vdi, sizeof(s->name));
|
|
qemu_free(buf);
|
|
return 0;
|
|
out:
|
|
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL);
|
|
if (s->fd >= 0) {
|
|
closesocket(s->fd);
|
|
}
|
|
qemu_free(buf);
|
|
return -1;
|
|
}
|
|
|
|
static int do_sd_create(char *filename, int64_t vdi_size,
|
|
uint32_t base_vid, uint32_t *vdi_id, int snapshot,
|
|
const char *addr, const char *port)
|
|
{
|
|
SheepdogVdiReq hdr;
|
|
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
int fd, ret;
|
|
unsigned int wlen, rlen = 0;
|
|
char buf[SD_MAX_VDI_LEN];
|
|
|
|
fd = connect_to_sdog(addr, port);
|
|
if (fd < 0) {
|
|
return -EIO;
|
|
}
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
strncpy(buf, filename, SD_MAX_VDI_LEN);
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
hdr.opcode = SD_OP_NEW_VDI;
|
|
hdr.base_vdi_id = base_vid;
|
|
|
|
wlen = SD_MAX_VDI_LEN;
|
|
|
|
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
hdr.snapid = snapshot;
|
|
|
|
hdr.data_length = wlen;
|
|
hdr.vdi_size = vdi_size;
|
|
|
|
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
|
|
closesocket(fd);
|
|
|
|
if (ret) {
|
|
return -EIO;
|
|
}
|
|
|
|
if (rsp->result != SD_RES_SUCCESS) {
|
|
error_report("%s, %s\n", sd_strerror(rsp->result), filename);
|
|
return -EIO;
|
|
}
|
|
|
|
if (vdi_id) {
|
|
*vdi_id = rsp->vdi_id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sd_create(const char *filename, QEMUOptionParameter *options)
|
|
{
|
|
int ret;
|
|
uint32_t vid = 0, base_vid = 0;
|
|
int64_t vdi_size = 0;
|
|
char *backing_file = NULL;
|
|
BDRVSheepdogState s;
|
|
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
|
|
uint32_t snapid;
|
|
|
|
strstart(filename, "sheepdog:", (const char **)&filename);
|
|
|
|
memset(&s, 0, sizeof(s));
|
|
memset(vdi, 0, sizeof(vdi));
|
|
memset(tag, 0, sizeof(tag));
|
|
if (parse_vdiname(&s, filename, vdi, &snapid, tag) < 0) {
|
|
error_report("invalid filename\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
|
vdi_size = options->value.n;
|
|
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
|
|
backing_file = options->value.s;
|
|
}
|
|
options++;
|
|
}
|
|
|
|
if (vdi_size > SD_MAX_VDI_SIZE) {
|
|
error_report("too big image size\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (backing_file) {
|
|
BlockDriverState *bs;
|
|
BDRVSheepdogState *s;
|
|
BlockDriver *drv;
|
|
|
|
/* Currently, only Sheepdog backing image is supported. */
|
|
drv = bdrv_find_protocol(backing_file);
|
|
if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) {
|
|
error_report("backing_file must be a sheepdog image\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = bdrv_file_open(&bs, backing_file, 0);
|
|
if (ret < 0)
|
|
return -EIO;
|
|
|
|
s = bs->opaque;
|
|
|
|
if (!is_snapshot(&s->inode)) {
|
|
error_report("cannot clone from a non snapshot vdi\n");
|
|
bdrv_delete(bs);
|
|
return -EINVAL;
|
|
}
|
|
|
|
base_vid = s->inode.vdi_id;
|
|
bdrv_delete(bs);
|
|
}
|
|
|
|
return do_sd_create((char *)vdi, vdi_size, base_vid, &vid, 0, s.addr, s.port);
|
|
}
|
|
|
|
static void sd_close(BlockDriverState *bs)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
SheepdogVdiReq hdr;
|
|
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
unsigned int wlen, rlen = 0;
|
|
int fd, ret;
|
|
|
|
dprintf("%s\n", s->name);
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
return;
|
|
}
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
|
|
hdr.opcode = SD_OP_RELEASE_VDI;
|
|
wlen = strlen(s->name) + 1;
|
|
hdr.data_length = wlen;
|
|
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
|
|
ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen);
|
|
|
|
closesocket(fd);
|
|
|
|
if (!ret && rsp->result != SD_RES_SUCCESS &&
|
|
rsp->result != SD_RES_VDI_NOT_LOCKED) {
|
|
error_report("%s, %s\n", sd_strerror(rsp->result), s->name);
|
|
}
|
|
|
|
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL);
|
|
closesocket(s->fd);
|
|
qemu_free(s->addr);
|
|
}
|
|
|
|
static int64_t sd_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
|
|
return s->inode.vdi_size;
|
|
}
|
|
|
|
static int sd_truncate(BlockDriverState *bs, int64_t offset)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
int ret, fd;
|
|
unsigned int datalen;
|
|
|
|
if (offset < s->inode.vdi_size) {
|
|
error_report("shrinking is not supported\n");
|
|
return -EINVAL;
|
|
} else if (offset > SD_MAX_VDI_SIZE) {
|
|
error_report("too big image size\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
return -EIO;
|
|
}
|
|
|
|
/* we don't need to update entire object */
|
|
datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
|
|
s->inode.vdi_size = offset;
|
|
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
|
|
s->inode.nr_copies, datalen, 0, 0);
|
|
close(fd);
|
|
|
|
if (ret < 0) {
|
|
error_report("failed to update an inode.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function is called after writing data objects. If we need to
|
|
* update metadata, this sends a write request to the vdi object.
|
|
* Otherwise, this calls the AIOCB callback.
|
|
*/
|
|
static void sd_write_done(SheepdogAIOCB *acb)
|
|
{
|
|
int ret;
|
|
BDRVSheepdogState *s = acb->common.bs->opaque;
|
|
struct iovec iov;
|
|
AIOReq *aio_req;
|
|
uint32_t offset, data_len, mn, mx;
|
|
|
|
mn = s->min_dirty_data_idx;
|
|
mx = s->max_dirty_data_idx;
|
|
if (mn <= mx) {
|
|
/* we need to update the vdi object. */
|
|
offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) +
|
|
mn * sizeof(s->inode.data_vdi_id[0]);
|
|
data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]);
|
|
|
|
s->min_dirty_data_idx = UINT32_MAX;
|
|
s->max_dirty_data_idx = 0;
|
|
|
|
iov.iov_base = &s->inode;
|
|
iov.iov_len = sizeof(s->inode);
|
|
aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id),
|
|
data_len, offset, 0, 0, offset);
|
|
ret = add_aio_request(s, aio_req, &iov, 1, 0, AIOCB_WRITE_UDATA);
|
|
if (ret) {
|
|
free_aio_req(s, aio_req);
|
|
acb->ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
acb->aio_done_func = sd_finish_aiocb;
|
|
acb->aiocb_type = AIOCB_WRITE_UDATA;
|
|
return;
|
|
}
|
|
out:
|
|
sd_finish_aiocb(acb);
|
|
}
|
|
|
|
/*
|
|
* Create a writable VDI from a snapshot
|
|
*/
|
|
static int sd_create_branch(BDRVSheepdogState *s)
|
|
{
|
|
int ret, fd;
|
|
uint32_t vid;
|
|
char *buf;
|
|
|
|
dprintf("%" PRIx32 " is snapshot.\n", s->inode.vdi_id);
|
|
|
|
buf = qemu_malloc(SD_INODE_SIZE);
|
|
|
|
ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &vid, 1,
|
|
s->addr, s->port);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
dprintf("%" PRIx32 " is created.\n", vid);
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
error_report("failed to connect\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies,
|
|
SD_INODE_SIZE, 0);
|
|
|
|
closesocket(fd);
|
|
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&s->inode, buf, sizeof(s->inode));
|
|
|
|
s->is_snapshot = 0;
|
|
ret = 0;
|
|
dprintf("%" PRIx32 " was newly created.\n", s->inode.vdi_id);
|
|
|
|
out:
|
|
qemu_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Send I/O requests to the server.
|
|
*
|
|
* This function sends requests to the server, links the requests to
|
|
* the outstanding_list in BDRVSheepdogState, and exits without
|
|
* waiting the response. The responses are received in the
|
|
* `aio_read_response' function which is called from the main loop as
|
|
* a fd handler.
|
|
*/
|
|
static void sd_readv_writev_bh_cb(void *p)
|
|
{
|
|
SheepdogAIOCB *acb = p;
|
|
int ret = 0;
|
|
unsigned long len, done = 0, total = acb->nb_sectors * SECTOR_SIZE;
|
|
unsigned long idx = acb->sector_num * SECTOR_SIZE / SD_DATA_OBJ_SIZE;
|
|
uint64_t oid;
|
|
uint64_t offset = (acb->sector_num * SECTOR_SIZE) % SD_DATA_OBJ_SIZE;
|
|
BDRVSheepdogState *s = acb->common.bs->opaque;
|
|
SheepdogInode *inode = &s->inode;
|
|
AIOReq *aio_req;
|
|
|
|
qemu_bh_delete(acb->bh);
|
|
acb->bh = NULL;
|
|
|
|
if (acb->aiocb_type == AIOCB_WRITE_UDATA && s->is_snapshot) {
|
|
/*
|
|
* In the case we open the snapshot VDI, Sheepdog creates the
|
|
* writable VDI when we do a write operation first.
|
|
*/
|
|
ret = sd_create_branch(s);
|
|
if (ret) {
|
|
acb->ret = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
while (done != total) {
|
|
uint8_t flags = 0;
|
|
uint64_t old_oid = 0;
|
|
int create = 0;
|
|
|
|
oid = vid_to_data_oid(inode->data_vdi_id[idx], idx);
|
|
|
|
len = MIN(total - done, SD_DATA_OBJ_SIZE - offset);
|
|
|
|
if (!inode->data_vdi_id[idx]) {
|
|
if (acb->aiocb_type == AIOCB_READ_UDATA) {
|
|
goto done;
|
|
}
|
|
|
|
create = 1;
|
|
} else if (acb->aiocb_type == AIOCB_WRITE_UDATA
|
|
&& !is_data_obj_writable(inode, idx)) {
|
|
/* Copy-On-Write */
|
|
create = 1;
|
|
old_oid = oid;
|
|
flags = SD_FLAG_CMD_COW;
|
|
}
|
|
|
|
if (create) {
|
|
dprintf("update ino (%" PRIu32") %" PRIu64 " %" PRIu64
|
|
" %" PRIu64 "\n", inode->vdi_id, oid,
|
|
vid_to_data_oid(inode->data_vdi_id[idx], idx), idx);
|
|
oid = vid_to_data_oid(inode->vdi_id, idx);
|
|
dprintf("new oid %lx\n", oid);
|
|
}
|
|
|
|
aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, old_oid, done);
|
|
|
|
if (create) {
|
|
AIOReq *areq;
|
|
QLIST_FOREACH(areq, &s->outstanding_aio_head,
|
|
outstanding_aio_siblings) {
|
|
if (areq == aio_req) {
|
|
continue;
|
|
}
|
|
if (areq->oid == oid) {
|
|
/*
|
|
* Sheepdog cannot handle simultaneous create
|
|
* requests to the same object. So we cannot send
|
|
* the request until the previous request
|
|
* finishes.
|
|
*/
|
|
aio_req->flags = 0;
|
|
aio_req->base_oid = 0;
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
|
|
create, acb->aiocb_type);
|
|
if (ret < 0) {
|
|
error_report("add_aio_request is failed\n");
|
|
free_aio_req(s, aio_req);
|
|
acb->ret = -EIO;
|
|
goto out;
|
|
}
|
|
done:
|
|
offset = 0;
|
|
idx++;
|
|
done += len;
|
|
}
|
|
out:
|
|
if (QLIST_EMPTY(&acb->aioreq_head)) {
|
|
sd_finish_aiocb(acb);
|
|
}
|
|
}
|
|
|
|
static BlockDriverAIOCB *sd_aio_writev(BlockDriverState *bs, int64_t sector_num,
|
|
QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
SheepdogAIOCB *acb;
|
|
|
|
if (bs->growable && sector_num + nb_sectors > bs->total_sectors) {
|
|
/* TODO: shouldn't block here */
|
|
if (sd_truncate(bs, (sector_num + nb_sectors) * SECTOR_SIZE) < 0) {
|
|
return NULL;
|
|
}
|
|
bs->total_sectors = sector_num + nb_sectors;
|
|
}
|
|
|
|
acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors, cb, opaque);
|
|
acb->aio_done_func = sd_write_done;
|
|
acb->aiocb_type = AIOCB_WRITE_UDATA;
|
|
|
|
sd_schedule_bh(sd_readv_writev_bh_cb, acb);
|
|
return &acb->common;
|
|
}
|
|
|
|
static BlockDriverAIOCB *sd_aio_readv(BlockDriverState *bs, int64_t sector_num,
|
|
QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
SheepdogAIOCB *acb;
|
|
int i;
|
|
|
|
acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors, cb, opaque);
|
|
acb->aiocb_type = AIOCB_READ_UDATA;
|
|
acb->aio_done_func = sd_finish_aiocb;
|
|
|
|
/*
|
|
* TODO: we can do better; we don't need to initialize
|
|
* blindly.
|
|
*/
|
|
for (i = 0; i < qiov->niov; i++) {
|
|
memset(qiov->iov[i].iov_base, 0, qiov->iov[i].iov_len);
|
|
}
|
|
|
|
sd_schedule_bh(sd_readv_writev_bh_cb, acb);
|
|
return &acb->common;
|
|
}
|
|
|
|
static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
int ret, fd;
|
|
uint32_t new_vid;
|
|
SheepdogInode *inode;
|
|
unsigned int datalen;
|
|
|
|
dprintf("sn_info: name %s id_str %s s: name %s vm_state_size %d "
|
|
"is_snapshot %d\n", sn_info->name, sn_info->id_str,
|
|
s->name, sn_info->vm_state_size, s->is_snapshot);
|
|
|
|
if (s->is_snapshot) {
|
|
error_report("You can't create a snapshot of a snapshot VDI, "
|
|
"%s (%" PRIu32 ").\n", s->name, s->inode.vdi_id);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
dprintf("%s %s\n", sn_info->name, sn_info->id_str);
|
|
|
|
s->inode.vm_state_size = sn_info->vm_state_size;
|
|
s->inode.vm_clock_nsec = sn_info->vm_clock_nsec;
|
|
strncpy(s->inode.tag, sn_info->name, sizeof(s->inode.tag));
|
|
/* we don't need to update entire object */
|
|
datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
|
|
|
|
/* refresh inode. */
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
ret = -EIO;
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
|
|
s->inode.nr_copies, datalen, 0, 0);
|
|
if (ret < 0) {
|
|
error_report("failed to write snapshot's inode.\n");
|
|
ret = -EIO;
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &new_vid, 1,
|
|
s->addr, s->port);
|
|
if (ret < 0) {
|
|
error_report("failed to create inode for snapshot. %s\n",
|
|
strerror(errno));
|
|
ret = -EIO;
|
|
goto cleanup;
|
|
}
|
|
|
|
inode = (SheepdogInode *)qemu_malloc(datalen);
|
|
|
|
ret = read_object(fd, (char *)inode, vid_to_vdi_oid(new_vid),
|
|
s->inode.nr_copies, datalen, 0);
|
|
|
|
if (ret < 0) {
|
|
error_report("failed to read new inode info. %s\n", strerror(errno));
|
|
ret = -EIO;
|
|
goto cleanup;
|
|
}
|
|
|
|
memcpy(&s->inode, inode, datalen);
|
|
dprintf("s->inode: name %s snap_id %x oid %x\n",
|
|
s->inode.name, s->inode.snap_id, s->inode.vdi_id);
|
|
|
|
cleanup:
|
|
closesocket(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
BDRVSheepdogState *old_s;
|
|
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
|
|
char *buf = NULL;
|
|
uint32_t vid;
|
|
uint32_t snapid = 0;
|
|
int ret = -ENOENT, fd;
|
|
|
|
old_s = qemu_malloc(sizeof(BDRVSheepdogState));
|
|
|
|
memcpy(old_s, s, sizeof(BDRVSheepdogState));
|
|
|
|
memset(vdi, 0, sizeof(vdi));
|
|
strncpy(vdi, s->name, sizeof(vdi));
|
|
|
|
memset(tag, 0, sizeof(tag));
|
|
snapid = strtoul(snapshot_id, NULL, 10);
|
|
if (!snapid) {
|
|
strncpy(tag, s->name, sizeof(tag));
|
|
}
|
|
|
|
ret = find_vdi_name(s, vdi, snapid, tag, &vid, 1);
|
|
if (ret) {
|
|
error_report("Failed to find_vdi_name\n");
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
error_report("failed to connect\n");
|
|
goto out;
|
|
}
|
|
|
|
buf = qemu_malloc(SD_INODE_SIZE);
|
|
ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies,
|
|
SD_INODE_SIZE, 0);
|
|
|
|
closesocket(fd);
|
|
|
|
if (ret) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&s->inode, buf, sizeof(s->inode));
|
|
|
|
if (!s->inode.vm_state_size) {
|
|
error_report("Invalid snapshot\n");
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
s->is_snapshot = 1;
|
|
|
|
qemu_free(buf);
|
|
qemu_free(old_s);
|
|
|
|
return 0;
|
|
out:
|
|
/* recover bdrv_sd_state */
|
|
memcpy(s, old_s, sizeof(BDRVSheepdogState));
|
|
qemu_free(buf);
|
|
qemu_free(old_s);
|
|
|
|
error_report("failed to open. recover old bdrv_sd_state.\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sd_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
|
|
{
|
|
/* FIXME: Delete specified snapshot id. */
|
|
return 0;
|
|
}
|
|
|
|
static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
SheepdogReq req;
|
|
int fd, nr = 1024, ret, max = BITS_TO_LONGS(SD_NR_VDIS) * sizeof(long);
|
|
QEMUSnapshotInfo *sn_tab = NULL;
|
|
unsigned wlen, rlen;
|
|
int found = 0;
|
|
static SheepdogInode inode;
|
|
unsigned long *vdi_inuse;
|
|
unsigned int start_nr;
|
|
uint64_t hval;
|
|
uint32_t vid;
|
|
|
|
vdi_inuse = qemu_malloc(max);
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
goto out;
|
|
}
|
|
|
|
rlen = max;
|
|
wlen = 0;
|
|
|
|
memset(&req, 0, sizeof(req));
|
|
|
|
req.opcode = SD_OP_READ_VDIS;
|
|
req.data_length = max;
|
|
|
|
ret = do_req(fd, (SheepdogReq *)&req, vdi_inuse, &wlen, &rlen);
|
|
|
|
closesocket(fd);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
sn_tab = qemu_mallocz(nr * sizeof(*sn_tab));
|
|
|
|
/* calculate a vdi id with hash function */
|
|
hval = fnv_64a_buf(s->name, strlen(s->name), FNV1A_64_INIT);
|
|
start_nr = hval & (SD_NR_VDIS - 1);
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
error_report("failed to connect\n");
|
|
goto out;
|
|
}
|
|
|
|
for (vid = start_nr; found < nr; vid = (vid + 1) % SD_NR_VDIS) {
|
|
if (!test_bit(vid, vdi_inuse)) {
|
|
break;
|
|
}
|
|
|
|
/* we don't need to read entire object */
|
|
ret = read_object(fd, (char *)&inode, vid_to_vdi_oid(vid),
|
|
0, SD_INODE_SIZE - sizeof(inode.data_vdi_id), 0);
|
|
|
|
if (ret) {
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(inode.name, s->name) && is_snapshot(&inode)) {
|
|
sn_tab[found].date_sec = inode.snap_ctime >> 32;
|
|
sn_tab[found].date_nsec = inode.snap_ctime & 0xffffffff;
|
|
sn_tab[found].vm_state_size = inode.vm_state_size;
|
|
sn_tab[found].vm_clock_nsec = inode.vm_clock_nsec;
|
|
|
|
snprintf(sn_tab[found].id_str, sizeof(sn_tab[found].id_str), "%u",
|
|
inode.snap_id);
|
|
strncpy(sn_tab[found].name, inode.tag,
|
|
MIN(sizeof(sn_tab[found].name), sizeof(inode.tag)));
|
|
found++;
|
|
}
|
|
}
|
|
|
|
closesocket(fd);
|
|
out:
|
|
*psn_tab = sn_tab;
|
|
|
|
qemu_free(vdi_inuse);
|
|
|
|
return found;
|
|
}
|
|
|
|
static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data,
|
|
int64_t pos, int size, int load)
|
|
{
|
|
int fd, create;
|
|
int ret = 0;
|
|
unsigned int data_len;
|
|
uint64_t vmstate_oid;
|
|
uint32_t vdi_index;
|
|
uint64_t offset;
|
|
|
|
fd = connect_to_sdog(s->addr, s->port);
|
|
if (fd < 0) {
|
|
ret = -EIO;
|
|
goto cleanup;
|
|
}
|
|
|
|
while (size) {
|
|
vdi_index = pos / SD_DATA_OBJ_SIZE;
|
|
offset = pos % SD_DATA_OBJ_SIZE;
|
|
|
|
data_len = MIN(size, SD_DATA_OBJ_SIZE);
|
|
|
|
vmstate_oid = vid_to_vmstate_oid(s->inode.vdi_id, vdi_index);
|
|
|
|
create = (offset == 0);
|
|
if (load) {
|
|
ret = read_object(fd, (char *)data, vmstate_oid,
|
|
s->inode.nr_copies, data_len, offset);
|
|
} else {
|
|
ret = write_object(fd, (char *)data, vmstate_oid,
|
|
s->inode.nr_copies, data_len, offset, create);
|
|
}
|
|
|
|
if (ret < 0) {
|
|
error_report("failed to save vmstate %s\n", strerror(errno));
|
|
ret = -EIO;
|
|
goto cleanup;
|
|
}
|
|
|
|
pos += data_len;
|
|
size -= data_len;
|
|
ret += data_len;
|
|
}
|
|
cleanup:
|
|
closesocket(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int sd_save_vmstate(BlockDriverState *bs, const uint8_t *data,
|
|
int64_t pos, int size)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
|
|
return do_load_save_vmstate(s, (uint8_t *)data, pos, size, 0);
|
|
}
|
|
|
|
static int sd_load_vmstate(BlockDriverState *bs, uint8_t *data,
|
|
int64_t pos, int size)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
|
|
return do_load_save_vmstate(s, data, pos, size, 1);
|
|
}
|
|
|
|
|
|
static QEMUOptionParameter sd_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_BACKING_FILE,
|
|
.type = OPT_STRING,
|
|
.help = "File name of a base image"
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
BlockDriver bdrv_sheepdog = {
|
|
.format_name = "sheepdog",
|
|
.protocol_name = "sheepdog",
|
|
.instance_size = sizeof(BDRVSheepdogState),
|
|
.bdrv_file_open = sd_open,
|
|
.bdrv_close = sd_close,
|
|
.bdrv_create = sd_create,
|
|
.bdrv_getlength = sd_getlength,
|
|
.bdrv_truncate = sd_truncate,
|
|
|
|
.bdrv_aio_readv = sd_aio_readv,
|
|
.bdrv_aio_writev = sd_aio_writev,
|
|
|
|
.bdrv_snapshot_create = sd_snapshot_create,
|
|
.bdrv_snapshot_goto = sd_snapshot_goto,
|
|
.bdrv_snapshot_delete = sd_snapshot_delete,
|
|
.bdrv_snapshot_list = sd_snapshot_list,
|
|
|
|
.bdrv_save_vmstate = sd_save_vmstate,
|
|
.bdrv_load_vmstate = sd_load_vmstate,
|
|
|
|
.create_options = sd_create_options,
|
|
};
|
|
|
|
static void bdrv_sheepdog_init(void)
|
|
{
|
|
bdrv_register(&bdrv_sheepdog);
|
|
}
|
|
block_init(bdrv_sheepdog_init);
|