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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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu-common.h" |
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#include "qemu/uri.h" |
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#include "qemu/error-report.h" |
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#include "qemu/sockets.h" |
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#include "block/block_int.h" |
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#include "qemu/bitops.h" |
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|
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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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|
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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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/* 0x04 is used internally by Sheepdog */
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#define SD_OP_DISCARD_OBJ 0x05 |
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|
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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_OP_FLUSH_VDI 0x16 |
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#define SD_OP_DEL_VDI 0x17 |
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|
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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_FLAG_CMD_CACHE 0x04 /* Writeback mode for cache */ |
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#define SD_FLAG_CMD_DIRECT 0x08 /* Don't use cache */ |
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|
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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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#define SD_RES_HALT 0x19 /* Sheepdog is stopped serving IO request */ |
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#define SD_RES_READONLY 0x1A /* Object is read-only */ |
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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 identifier 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 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 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 bool 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 bool 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 bool 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) aio_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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AIOCB_FLUSH_CACHE, |
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AIOCB_DISCARD_OBJ, |
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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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Coroutine *coroutine; |
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void (*aio_done_func)(SheepdogAIOCB *);
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bool canceled;
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int nr_pending;
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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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bool is_snapshot;
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uint32_t cache_flags; |
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bool discard_supported;
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char *host_spec;
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bool is_unix;
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int fd;
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CoMutex lock; |
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Coroutine *co_send; |
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Coroutine *co_recv; |
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uint32_t aioreq_seq_num; |
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QLIST_HEAD(inflight_aio_head, AIOReq) inflight_aio_head; |
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QLIST_HEAD(pending_aio_head, AIOReq) pending_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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{SD_RES_HALT, "Sheepdog is stopped serving IO request"},
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{SD_RES_READONLY, "Object is read-only"},
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}; |
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for (i = 0; i < ARRAY_SIZE(errors); ++i) { |
358 |
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 sd_co_rw_vector, we send the I/O requests to the server and
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* link the requests to the inflight_list in the
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* BDRVSheepdogState. The function exits without waiting for
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* receiving the response.
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*
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* 2. 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. We switch back to sd_co_readv/writev after
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* all 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; |
387 |
|
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aio_req = g_malloc(sizeof(*aio_req));
|
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aio_req->aiocb = acb; |
390 |
aio_req->iov_offset = iov_offset; |
391 |
aio_req->oid = oid; |
392 |
aio_req->base_oid = base_oid; |
393 |
aio_req->offset = offset; |
394 |
aio_req->data_len = data_len; |
395 |
aio_req->flags = flags; |
396 |
aio_req->id = s->aioreq_seq_num++; |
397 |
|
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acb->nr_pending++; |
399 |
return aio_req;
|
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} |
401 |
|
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static inline void free_aio_req(BDRVSheepdogState *s, AIOReq *aio_req) |
403 |
{ |
404 |
SheepdogAIOCB *acb = aio_req->aiocb; |
405 |
|
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QLIST_REMOVE(aio_req, aio_siblings); |
407 |
g_free(aio_req); |
408 |
|
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acb->nr_pending--; |
410 |
} |
411 |
|
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static void coroutine_fn sd_finish_aiocb(SheepdogAIOCB *acb) |
413 |
{ |
414 |
if (!acb->canceled) {
|
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qemu_coroutine_enter(acb->coroutine, NULL);
|
416 |
} |
417 |
qemu_aio_release(acb); |
418 |
} |
419 |
|
420 |
static void sd_aio_cancel(BlockDriverAIOCB *blockacb) |
421 |
{ |
422 |
SheepdogAIOCB *acb = (SheepdogAIOCB *)blockacb; |
423 |
|
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/*
|
425 |
* Sheepdog cannot cancel the requests which are already sent to
|
426 |
* the servers, so we just complete the request with -EIO here.
|
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*/
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acb->ret = -EIO; |
429 |
qemu_coroutine_enter(acb->coroutine, NULL);
|
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acb->canceled = true;
|
431 |
} |
432 |
|
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static const AIOCBInfo sd_aiocb_info = { |
434 |
.aiocb_size = sizeof(SheepdogAIOCB),
|
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.cancel = sd_aio_cancel, |
436 |
}; |
437 |
|
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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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{ |
441 |
SheepdogAIOCB *acb; |
442 |
|
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acb = qemu_aio_get(&sd_aiocb_info, bs, NULL, NULL); |
444 |
|
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acb->qiov = qiov; |
446 |
|
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acb->sector_num = sector_num; |
448 |
acb->nb_sectors = nb_sectors; |
449 |
|
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acb->aio_done_func = NULL;
|
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acb->canceled = false;
|
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acb->coroutine = qemu_coroutine_self(); |
453 |
acb->ret = 0;
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acb->nr_pending = 0;
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return acb;
|
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} |
457 |
|
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static int connect_to_sdog(BDRVSheepdogState *s) |
459 |
{ |
460 |
int fd;
|
461 |
Error *err = NULL;
|
462 |
|
463 |
if (s->is_unix) {
|
464 |
fd = unix_connect(s->host_spec, &err); |
465 |
} else {
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466 |
fd = inet_connect(s->host_spec, &err); |
467 |
|
468 |
if (err == NULL) { |
469 |
int ret = socket_set_nodelay(fd);
|
470 |
if (ret < 0) { |
471 |
error_report("%s", strerror(errno));
|
472 |
} |
473 |
} |
474 |
} |
475 |
|
476 |
if (err != NULL) { |
477 |
qerror_report_err(err); |
478 |
error_free(err); |
479 |
} else {
|
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qemu_set_nonblock(fd); |
481 |
} |
482 |
|
483 |
return fd;
|
484 |
} |
485 |
|
486 |
static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data, |
487 |
unsigned int *wlen) |
488 |
{ |
489 |
int ret;
|
490 |
|
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ret = qemu_co_send(sockfd, hdr, sizeof(*hdr));
|
492 |
if (ret < sizeof(*hdr)) { |
493 |
error_report("failed to send a req, %s", strerror(errno));
|
494 |
return ret;
|
495 |
} |
496 |
|
497 |
ret = qemu_co_send(sockfd, data, *wlen); |
498 |
if (ret < *wlen) {
|
499 |
error_report("failed to send a req, %s", strerror(errno));
|
500 |
} |
501 |
|
502 |
return ret;
|
503 |
} |
504 |
|
505 |
static void restart_co_req(void *opaque) |
506 |
{ |
507 |
Coroutine *co = opaque; |
508 |
|
509 |
qemu_coroutine_enter(co, NULL);
|
510 |
} |
511 |
|
512 |
typedef struct SheepdogReqCo { |
513 |
int sockfd;
|
514 |
SheepdogReq *hdr; |
515 |
void *data;
|
516 |
unsigned int *wlen; |
517 |
unsigned int *rlen; |
518 |
int ret;
|
519 |
bool finished;
|
520 |
} SheepdogReqCo; |
521 |
|
522 |
static coroutine_fn void do_co_req(void *opaque) |
523 |
{ |
524 |
int ret;
|
525 |
Coroutine *co; |
526 |
SheepdogReqCo *srco = opaque; |
527 |
int sockfd = srco->sockfd;
|
528 |
SheepdogReq *hdr = srco->hdr; |
529 |
void *data = srco->data;
|
530 |
unsigned int *wlen = srco->wlen; |
531 |
unsigned int *rlen = srco->rlen; |
532 |
|
533 |
co = qemu_coroutine_self(); |
534 |
qemu_aio_set_fd_handler(sockfd, NULL, restart_co_req, co);
|
535 |
|
536 |
ret = send_co_req(sockfd, hdr, data, wlen); |
537 |
if (ret < 0) { |
538 |
goto out;
|
539 |
} |
540 |
|
541 |
qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, co);
|
542 |
|
543 |
ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr));
|
544 |
if (ret < sizeof(*hdr)) { |
545 |
error_report("failed to get a rsp, %s", strerror(errno));
|
546 |
ret = -errno; |
547 |
goto out;
|
548 |
} |
549 |
|
550 |
if (*rlen > hdr->data_length) {
|
551 |
*rlen = hdr->data_length; |
552 |
} |
553 |
|
554 |
if (*rlen) {
|
555 |
ret = qemu_co_recv(sockfd, data, *rlen); |
556 |
if (ret < *rlen) {
|
557 |
error_report("failed to get the data, %s", strerror(errno));
|
558 |
ret = -errno; |
559 |
goto out;
|
560 |
} |
561 |
} |
562 |
ret = 0;
|
563 |
out:
|
564 |
/* there is at most one request for this sockfd, so it is safe to
|
565 |
* set each handler to NULL. */
|
566 |
qemu_aio_set_fd_handler(sockfd, NULL, NULL, NULL); |
567 |
|
568 |
srco->ret = ret; |
569 |
srco->finished = true;
|
570 |
} |
571 |
|
572 |
static int do_req(int sockfd, SheepdogReq *hdr, void *data, |
573 |
unsigned int *wlen, unsigned int *rlen) |
574 |
{ |
575 |
Coroutine *co; |
576 |
SheepdogReqCo srco = { |
577 |
.sockfd = sockfd, |
578 |
.hdr = hdr, |
579 |
.data = data, |
580 |
.wlen = wlen, |
581 |
.rlen = rlen, |
582 |
.ret = 0,
|
583 |
.finished = false,
|
584 |
}; |
585 |
|
586 |
if (qemu_in_coroutine()) {
|
587 |
do_co_req(&srco); |
588 |
} else {
|
589 |
co = qemu_coroutine_create(do_co_req); |
590 |
qemu_coroutine_enter(co, &srco); |
591 |
while (!srco.finished) {
|
592 |
qemu_aio_wait(); |
593 |
} |
594 |
} |
595 |
|
596 |
return srco.ret;
|
597 |
} |
598 |
|
599 |
static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, |
600 |
struct iovec *iov, int niov, bool create, |
601 |
enum AIOCBState aiocb_type);
|
602 |
static int coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req); |
603 |
|
604 |
|
605 |
static AIOReq *find_pending_req(BDRVSheepdogState *s, uint64_t oid)
|
606 |
{ |
607 |
AIOReq *aio_req; |
608 |
|
609 |
QLIST_FOREACH(aio_req, &s->pending_aio_head, aio_siblings) { |
610 |
if (aio_req->oid == oid) {
|
611 |
return aio_req;
|
612 |
} |
613 |
} |
614 |
|
615 |
return NULL; |
616 |
} |
617 |
|
618 |
/*
|
619 |
* This function searchs pending requests to the object `oid', and
|
620 |
* sends them.
|
621 |
*/
|
622 |
static void coroutine_fn send_pending_req(BDRVSheepdogState *s, uint64_t oid) |
623 |
{ |
624 |
AIOReq *aio_req; |
625 |
SheepdogAIOCB *acb; |
626 |
int ret;
|
627 |
|
628 |
while ((aio_req = find_pending_req(s, oid)) != NULL) { |
629 |
acb = aio_req->aiocb; |
630 |
/* move aio_req from pending list to inflight one */
|
631 |
QLIST_REMOVE(aio_req, aio_siblings); |
632 |
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); |
633 |
ret = add_aio_request(s, aio_req, acb->qiov->iov, |
634 |
acb->qiov->niov, false, acb->aiocb_type);
|
635 |
if (ret < 0) { |
636 |
error_report("add_aio_request is failed");
|
637 |
free_aio_req(s, aio_req); |
638 |
if (!acb->nr_pending) {
|
639 |
sd_finish_aiocb(acb); |
640 |
} |
641 |
} |
642 |
} |
643 |
} |
644 |
|
645 |
/*
|
646 |
* Receive responses of the I/O requests.
|
647 |
*
|
648 |
* This function is registered as a fd handler, and called from the
|
649 |
* main loop when s->fd is ready for reading responses.
|
650 |
*/
|
651 |
static void coroutine_fn aio_read_response(void *opaque) |
652 |
{ |
653 |
SheepdogObjRsp rsp; |
654 |
BDRVSheepdogState *s = opaque; |
655 |
int fd = s->fd;
|
656 |
int ret;
|
657 |
AIOReq *aio_req = NULL;
|
658 |
SheepdogAIOCB *acb; |
659 |
uint64_t idx; |
660 |
|
661 |
if (QLIST_EMPTY(&s->inflight_aio_head)) {
|
662 |
goto out;
|
663 |
} |
664 |
|
665 |
/* read a header */
|
666 |
ret = qemu_co_recv(fd, &rsp, sizeof(rsp));
|
667 |
if (ret < 0) { |
668 |
error_report("failed to get the header, %s", strerror(errno));
|
669 |
goto out;
|
670 |
} |
671 |
|
672 |
/* find the right aio_req from the inflight aio list */
|
673 |
QLIST_FOREACH(aio_req, &s->inflight_aio_head, aio_siblings) { |
674 |
if (aio_req->id == rsp.id) {
|
675 |
break;
|
676 |
} |
677 |
} |
678 |
if (!aio_req) {
|
679 |
error_report("cannot find aio_req %x", rsp.id);
|
680 |
goto out;
|
681 |
} |
682 |
|
683 |
acb = aio_req->aiocb; |
684 |
|
685 |
switch (acb->aiocb_type) {
|
686 |
case AIOCB_WRITE_UDATA:
|
687 |
/* this coroutine context is no longer suitable for co_recv
|
688 |
* because we may send data to update vdi objects */
|
689 |
s->co_recv = NULL;
|
690 |
if (!is_data_obj(aio_req->oid)) {
|
691 |
break;
|
692 |
} |
693 |
idx = data_oid_to_idx(aio_req->oid); |
694 |
|
695 |
if (s->inode.data_vdi_id[idx] != s->inode.vdi_id) {
|
696 |
/*
|
697 |
* If the object is newly created one, we need to update
|
698 |
* the vdi object (metadata object). min_dirty_data_idx
|
699 |
* and max_dirty_data_idx are changed to include updated
|
700 |
* index between them.
|
701 |
*/
|
702 |
if (rsp.result == SD_RES_SUCCESS) {
|
703 |
s->inode.data_vdi_id[idx] = s->inode.vdi_id; |
704 |
s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx); |
705 |
s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx); |
706 |
} |
707 |
/*
|
708 |
* Some requests may be blocked because simultaneous
|
709 |
* create requests are not allowed, so we search the
|
710 |
* pending requests here.
|
711 |
*/
|
712 |
send_pending_req(s, aio_req->oid); |
713 |
} |
714 |
break;
|
715 |
case AIOCB_READ_UDATA:
|
716 |
ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov, |
717 |
aio_req->iov_offset, rsp.data_length); |
718 |
if (ret < 0) { |
719 |
error_report("failed to get the data, %s", strerror(errno));
|
720 |
goto out;
|
721 |
} |
722 |
break;
|
723 |
case AIOCB_FLUSH_CACHE:
|
724 |
if (rsp.result == SD_RES_INVALID_PARMS) {
|
725 |
DPRINTF("disable cache since the server doesn't support it\n");
|
726 |
s->cache_flags = SD_FLAG_CMD_DIRECT; |
727 |
rsp.result = SD_RES_SUCCESS; |
728 |
} |
729 |
break;
|
730 |
case AIOCB_DISCARD_OBJ:
|
731 |
switch (rsp.result) {
|
732 |
case SD_RES_INVALID_PARMS:
|
733 |
error_report("sheep(%s) doesn't support discard command",
|
734 |
s->host_spec); |
735 |
rsp.result = SD_RES_SUCCESS; |
736 |
s->discard_supported = false;
|
737 |
break;
|
738 |
case SD_RES_SUCCESS:
|
739 |
idx = data_oid_to_idx(aio_req->oid); |
740 |
s->inode.data_vdi_id[idx] = 0;
|
741 |
break;
|
742 |
default:
|
743 |
break;
|
744 |
} |
745 |
} |
746 |
|
747 |
switch (rsp.result) {
|
748 |
case SD_RES_SUCCESS:
|
749 |
break;
|
750 |
case SD_RES_READONLY:
|
751 |
ret = resend_aioreq(s, aio_req); |
752 |
if (ret == SD_RES_SUCCESS) {
|
753 |
goto out;
|
754 |
} |
755 |
/* fall through */
|
756 |
default:
|
757 |
acb->ret = -EIO; |
758 |
error_report("%s", sd_strerror(rsp.result));
|
759 |
break;
|
760 |
} |
761 |
|
762 |
free_aio_req(s, aio_req); |
763 |
if (!acb->nr_pending) {
|
764 |
/*
|
765 |
* We've finished all requests which belong to the AIOCB, so
|
766 |
* we can switch back to sd_co_readv/writev now.
|
767 |
*/
|
768 |
acb->aio_done_func(acb); |
769 |
} |
770 |
out:
|
771 |
s->co_recv = NULL;
|
772 |
} |
773 |
|
774 |
static void co_read_response(void *opaque) |
775 |
{ |
776 |
BDRVSheepdogState *s = opaque; |
777 |
|
778 |
if (!s->co_recv) {
|
779 |
s->co_recv = qemu_coroutine_create(aio_read_response); |
780 |
} |
781 |
|
782 |
qemu_coroutine_enter(s->co_recv, opaque); |
783 |
} |
784 |
|
785 |
static void co_write_request(void *opaque) |
786 |
{ |
787 |
BDRVSheepdogState *s = opaque; |
788 |
|
789 |
qemu_coroutine_enter(s->co_send, NULL);
|
790 |
} |
791 |
|
792 |
/*
|
793 |
* Return a socket discriptor to read/write objects.
|
794 |
*
|
795 |
* We cannot use this discriptor for other operations because
|
796 |
* the block driver may be on waiting response from the server.
|
797 |
*/
|
798 |
static int get_sheep_fd(BDRVSheepdogState *s) |
799 |
{ |
800 |
int fd;
|
801 |
|
802 |
fd = connect_to_sdog(s); |
803 |
if (fd < 0) { |
804 |
return fd;
|
805 |
} |
806 |
|
807 |
qemu_aio_set_fd_handler(fd, co_read_response, NULL, s);
|
808 |
return fd;
|
809 |
} |
810 |
|
811 |
static int sd_parse_uri(BDRVSheepdogState *s, const char *filename, |
812 |
char *vdi, uint32_t *snapid, char *tag) |
813 |
{ |
814 |
URI *uri; |
815 |
QueryParams *qp = NULL;
|
816 |
int ret = 0; |
817 |
|
818 |
uri = uri_parse(filename); |
819 |
if (!uri) {
|
820 |
return -EINVAL;
|
821 |
} |
822 |
|
823 |
/* transport */
|
824 |
if (!strcmp(uri->scheme, "sheepdog")) { |
825 |
s->is_unix = false;
|
826 |
} else if (!strcmp(uri->scheme, "sheepdog+tcp")) { |
827 |
s->is_unix = false;
|
828 |
} else if (!strcmp(uri->scheme, "sheepdog+unix")) { |
829 |
s->is_unix = true;
|
830 |
} else {
|
831 |
ret = -EINVAL; |
832 |
goto out;
|
833 |
} |
834 |
|
835 |
if (uri->path == NULL || !strcmp(uri->path, "/")) { |
836 |
ret = -EINVAL; |
837 |
goto out;
|
838 |
} |
839 |
pstrcpy(vdi, SD_MAX_VDI_LEN, uri->path + 1);
|
840 |
|
841 |
qp = query_params_parse(uri->query); |
842 |
if (qp->n > 1 || (s->is_unix && !qp->n) || (!s->is_unix && qp->n)) { |
843 |
ret = -EINVAL; |
844 |
goto out;
|
845 |
} |
846 |
|
847 |
if (s->is_unix) {
|
848 |
/* sheepdog+unix:///vdiname?socket=path */
|
849 |
if (uri->server || uri->port || strcmp(qp->p[0].name, "socket")) { |
850 |
ret = -EINVAL; |
851 |
goto out;
|
852 |
} |
853 |
s->host_spec = g_strdup(qp->p[0].value);
|
854 |
} else {
|
855 |
/* sheepdog[+tcp]://[host:port]/vdiname */
|
856 |
s->host_spec = g_strdup_printf("%s:%d", uri->server ?: SD_DEFAULT_ADDR,
|
857 |
uri->port ?: SD_DEFAULT_PORT); |
858 |
} |
859 |
|
860 |
/* snapshot tag */
|
861 |
if (uri->fragment) {
|
862 |
*snapid = strtoul(uri->fragment, NULL, 10); |
863 |
if (*snapid == 0) { |
864 |
pstrcpy(tag, SD_MAX_VDI_TAG_LEN, uri->fragment); |
865 |
} |
866 |
} else {
|
867 |
*snapid = CURRENT_VDI_ID; /* search current vdi */
|
868 |
} |
869 |
|
870 |
out:
|
871 |
if (qp) {
|
872 |
query_params_free(qp); |
873 |
} |
874 |
uri_free(uri); |
875 |
return ret;
|
876 |
} |
877 |
|
878 |
/*
|
879 |
* Parse a filename (old syntax)
|
880 |
*
|
881 |
* filename must be one of the following formats:
|
882 |
* 1. [vdiname]
|
883 |
* 2. [vdiname]:[snapid]
|
884 |
* 3. [vdiname]:[tag]
|
885 |
* 4. [hostname]:[port]:[vdiname]
|
886 |
* 5. [hostname]:[port]:[vdiname]:[snapid]
|
887 |
* 6. [hostname]:[port]:[vdiname]:[tag]
|
888 |
*
|
889 |
* You can boot from the snapshot images by specifying `snapid` or
|
890 |
* `tag'.
|
891 |
*
|
892 |
* You can run VMs outside the Sheepdog cluster by specifying
|
893 |
* `hostname' and `port' (experimental).
|
894 |
*/
|
895 |
static int parse_vdiname(BDRVSheepdogState *s, const char *filename, |
896 |
char *vdi, uint32_t *snapid, char *tag) |
897 |
{ |
898 |
char *p, *q, *uri;
|
899 |
const char *host_spec, *vdi_spec; |
900 |
int nr_sep, ret;
|
901 |
|
902 |
strstart(filename, "sheepdog:", (const char **)&filename); |
903 |
p = q = g_strdup(filename); |
904 |
|
905 |
/* count the number of separators */
|
906 |
nr_sep = 0;
|
907 |
while (*p) {
|
908 |
if (*p == ':') { |
909 |
nr_sep++; |
910 |
} |
911 |
p++; |
912 |
} |
913 |
p = q; |
914 |
|
915 |
/* use the first two tokens as host_spec. */
|
916 |
if (nr_sep >= 2) { |
917 |
host_spec = p; |
918 |
p = strchr(p, ':');
|
919 |
p++; |
920 |
p = strchr(p, ':');
|
921 |
*p++ = '\0';
|
922 |
} else {
|
923 |
host_spec = "";
|
924 |
} |
925 |
|
926 |
vdi_spec = p; |
927 |
|
928 |
p = strchr(vdi_spec, ':');
|
929 |
if (p) {
|
930 |
*p++ = '#';
|
931 |
} |
932 |
|
933 |
uri = g_strdup_printf("sheepdog://%s/%s", host_spec, vdi_spec);
|
934 |
|
935 |
ret = sd_parse_uri(s, uri, vdi, snapid, tag); |
936 |
|
937 |
g_free(q); |
938 |
g_free(uri); |
939 |
|
940 |
return ret;
|
941 |
} |
942 |
|
943 |
static int find_vdi_name(BDRVSheepdogState *s, const char *filename, |
944 |
uint32_t snapid, const char *tag, uint32_t *vid, |
945 |
bool lock)
|
946 |
{ |
947 |
int ret, fd;
|
948 |
SheepdogVdiReq hdr; |
949 |
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
950 |
unsigned int wlen, rlen = 0; |
951 |
char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN];
|
952 |
|
953 |
fd = connect_to_sdog(s); |
954 |
if (fd < 0) { |
955 |
return fd;
|
956 |
} |
957 |
|
958 |
/* This pair of strncpy calls ensures that the buffer is zero-filled,
|
959 |
* which is desirable since we'll soon be sending those bytes, and
|
960 |
* don't want the send_req to read uninitialized data.
|
961 |
*/
|
962 |
strncpy(buf, filename, SD_MAX_VDI_LEN); |
963 |
strncpy(buf + SD_MAX_VDI_LEN, tag, SD_MAX_VDI_TAG_LEN); |
964 |
|
965 |
memset(&hdr, 0, sizeof(hdr)); |
966 |
if (lock) {
|
967 |
hdr.opcode = SD_OP_LOCK_VDI; |
968 |
} else {
|
969 |
hdr.opcode = SD_OP_GET_VDI_INFO; |
970 |
} |
971 |
wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN; |
972 |
hdr.proto_ver = SD_PROTO_VER; |
973 |
hdr.data_length = wlen; |
974 |
hdr.snapid = snapid; |
975 |
hdr.flags = SD_FLAG_CMD_WRITE; |
976 |
|
977 |
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); |
978 |
if (ret) {
|
979 |
goto out;
|
980 |
} |
981 |
|
982 |
if (rsp->result != SD_RES_SUCCESS) {
|
983 |
error_report("cannot get vdi info, %s, %s %d %s",
|
984 |
sd_strerror(rsp->result), filename, snapid, tag); |
985 |
if (rsp->result == SD_RES_NO_VDI) {
|
986 |
ret = -ENOENT; |
987 |
} else {
|
988 |
ret = -EIO; |
989 |
} |
990 |
goto out;
|
991 |
} |
992 |
*vid = rsp->vdi_id; |
993 |
|
994 |
ret = 0;
|
995 |
out:
|
996 |
closesocket(fd); |
997 |
return ret;
|
998 |
} |
999 |
|
1000 |
static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, |
1001 |
struct iovec *iov, int niov, bool create, |
1002 |
enum AIOCBState aiocb_type)
|
1003 |
{ |
1004 |
int nr_copies = s->inode.nr_copies;
|
1005 |
SheepdogObjReq hdr; |
1006 |
unsigned int wlen = 0; |
1007 |
int ret;
|
1008 |
uint64_t oid = aio_req->oid; |
1009 |
unsigned int datalen = aio_req->data_len; |
1010 |
uint64_t offset = aio_req->offset; |
1011 |
uint8_t flags = aio_req->flags; |
1012 |
uint64_t old_oid = aio_req->base_oid; |
1013 |
|
1014 |
if (!nr_copies) {
|
1015 |
error_report("bug");
|
1016 |
} |
1017 |
|
1018 |
memset(&hdr, 0, sizeof(hdr)); |
1019 |
|
1020 |
switch (aiocb_type) {
|
1021 |
case AIOCB_FLUSH_CACHE:
|
1022 |
hdr.opcode = SD_OP_FLUSH_VDI; |
1023 |
break;
|
1024 |
case AIOCB_READ_UDATA:
|
1025 |
hdr.opcode = SD_OP_READ_OBJ; |
1026 |
hdr.flags = flags; |
1027 |
break;
|
1028 |
case AIOCB_WRITE_UDATA:
|
1029 |
if (create) {
|
1030 |
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; |
1031 |
} else {
|
1032 |
hdr.opcode = SD_OP_WRITE_OBJ; |
1033 |
} |
1034 |
wlen = datalen; |
1035 |
hdr.flags = SD_FLAG_CMD_WRITE | flags; |
1036 |
break;
|
1037 |
case AIOCB_DISCARD_OBJ:
|
1038 |
hdr.opcode = SD_OP_DISCARD_OBJ; |
1039 |
break;
|
1040 |
} |
1041 |
|
1042 |
if (s->cache_flags) {
|
1043 |
hdr.flags |= s->cache_flags; |
1044 |
} |
1045 |
|
1046 |
hdr.oid = oid; |
1047 |
hdr.cow_oid = old_oid; |
1048 |
hdr.copies = s->inode.nr_copies; |
1049 |
|
1050 |
hdr.data_length = datalen; |
1051 |
hdr.offset = offset; |
1052 |
|
1053 |
hdr.id = aio_req->id; |
1054 |
|
1055 |
qemu_co_mutex_lock(&s->lock); |
1056 |
s->co_send = qemu_coroutine_self(); |
1057 |
qemu_aio_set_fd_handler(s->fd, co_read_response, co_write_request, s); |
1058 |
socket_set_cork(s->fd, 1);
|
1059 |
|
1060 |
/* send a header */
|
1061 |
ret = qemu_co_send(s->fd, &hdr, sizeof(hdr));
|
1062 |
if (ret < 0) { |
1063 |
qemu_co_mutex_unlock(&s->lock); |
1064 |
error_report("failed to send a req, %s", strerror(errno));
|
1065 |
return -errno;
|
1066 |
} |
1067 |
|
1068 |
if (wlen) {
|
1069 |
ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen); |
1070 |
if (ret < 0) { |
1071 |
qemu_co_mutex_unlock(&s->lock); |
1072 |
error_report("failed to send a data, %s", strerror(errno));
|
1073 |
return -errno;
|
1074 |
} |
1075 |
} |
1076 |
|
1077 |
socket_set_cork(s->fd, 0);
|
1078 |
qemu_aio_set_fd_handler(s->fd, co_read_response, NULL, s);
|
1079 |
qemu_co_mutex_unlock(&s->lock); |
1080 |
|
1081 |
return 0; |
1082 |
} |
1083 |
|
1084 |
static int read_write_object(int fd, char *buf, uint64_t oid, int copies, |
1085 |
unsigned int datalen, uint64_t offset, |
1086 |
bool write, bool create, uint32_t cache_flags) |
1087 |
{ |
1088 |
SheepdogObjReq hdr; |
1089 |
SheepdogObjRsp *rsp = (SheepdogObjRsp *)&hdr; |
1090 |
unsigned int wlen, rlen; |
1091 |
int ret;
|
1092 |
|
1093 |
memset(&hdr, 0, sizeof(hdr)); |
1094 |
|
1095 |
if (write) {
|
1096 |
wlen = datalen; |
1097 |
rlen = 0;
|
1098 |
hdr.flags = SD_FLAG_CMD_WRITE; |
1099 |
if (create) {
|
1100 |
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; |
1101 |
} else {
|
1102 |
hdr.opcode = SD_OP_WRITE_OBJ; |
1103 |
} |
1104 |
} else {
|
1105 |
wlen = 0;
|
1106 |
rlen = datalen; |
1107 |
hdr.opcode = SD_OP_READ_OBJ; |
1108 |
} |
1109 |
|
1110 |
hdr.flags |= cache_flags; |
1111 |
|
1112 |
hdr.oid = oid; |
1113 |
hdr.data_length = datalen; |
1114 |
hdr.offset = offset; |
1115 |
hdr.copies = copies; |
1116 |
|
1117 |
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); |
1118 |
if (ret) {
|
1119 |
error_report("failed to send a request to the sheep");
|
1120 |
return ret;
|
1121 |
} |
1122 |
|
1123 |
switch (rsp->result) {
|
1124 |
case SD_RES_SUCCESS:
|
1125 |
return 0; |
1126 |
default:
|
1127 |
error_report("%s", sd_strerror(rsp->result));
|
1128 |
return -EIO;
|
1129 |
} |
1130 |
} |
1131 |
|
1132 |
static int read_object(int fd, char *buf, uint64_t oid, int copies, |
1133 |
unsigned int datalen, uint64_t offset, |
1134 |
uint32_t cache_flags) |
1135 |
{ |
1136 |
return read_write_object(fd, buf, oid, copies, datalen, offset, false, |
1137 |
false, cache_flags);
|
1138 |
} |
1139 |
|
1140 |
static int write_object(int fd, char *buf, uint64_t oid, int copies, |
1141 |
unsigned int datalen, uint64_t offset, bool create, |
1142 |
uint32_t cache_flags) |
1143 |
{ |
1144 |
return read_write_object(fd, buf, oid, copies, datalen, offset, true, |
1145 |
create, cache_flags); |
1146 |
} |
1147 |
|
1148 |
/* update inode with the latest state */
|
1149 |
static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag) |
1150 |
{ |
1151 |
SheepdogInode *inode; |
1152 |
int ret = 0, fd; |
1153 |
uint32_t vid = 0;
|
1154 |
|
1155 |
fd = connect_to_sdog(s); |
1156 |
if (fd < 0) { |
1157 |
return -EIO;
|
1158 |
} |
1159 |
|
1160 |
inode = g_malloc(sizeof(s->inode));
|
1161 |
|
1162 |
ret = find_vdi_name(s, s->name, snapid, tag, &vid, false);
|
1163 |
if (ret) {
|
1164 |
goto out;
|
1165 |
} |
1166 |
|
1167 |
ret = read_object(fd, (char *)inode, vid_to_vdi_oid(vid),
|
1168 |
s->inode.nr_copies, sizeof(*inode), 0, s->cache_flags); |
1169 |
if (ret < 0) { |
1170 |
goto out;
|
1171 |
} |
1172 |
|
1173 |
if (inode->vdi_id != s->inode.vdi_id) {
|
1174 |
memcpy(&s->inode, inode, sizeof(s->inode));
|
1175 |
} |
1176 |
|
1177 |
out:
|
1178 |
g_free(inode); |
1179 |
closesocket(fd); |
1180 |
|
1181 |
return ret;
|
1182 |
} |
1183 |
|
1184 |
static int coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req) |
1185 |
{ |
1186 |
SheepdogAIOCB *acb = aio_req->aiocb; |
1187 |
bool create = false; |
1188 |
int ret;
|
1189 |
|
1190 |
ret = reload_inode(s, 0, ""); |
1191 |
if (ret < 0) { |
1192 |
return ret;
|
1193 |
} |
1194 |
|
1195 |
aio_req->oid = vid_to_data_oid(s->inode.vdi_id, |
1196 |
data_oid_to_idx(aio_req->oid)); |
1197 |
|
1198 |
/* check whether this request becomes a CoW one */
|
1199 |
if (acb->aiocb_type == AIOCB_WRITE_UDATA) {
|
1200 |
int idx = data_oid_to_idx(aio_req->oid);
|
1201 |
AIOReq *areq; |
1202 |
|
1203 |
if (s->inode.data_vdi_id[idx] == 0) { |
1204 |
create = true;
|
1205 |
goto out;
|
1206 |
} |
1207 |
if (is_data_obj_writable(&s->inode, idx)) {
|
1208 |
goto out;
|
1209 |
} |
1210 |
|
1211 |
/* link to the pending list if there is another CoW request to
|
1212 |
* the same object */
|
1213 |
QLIST_FOREACH(areq, &s->inflight_aio_head, aio_siblings) { |
1214 |
if (areq != aio_req && areq->oid == aio_req->oid) {
|
1215 |
DPRINTF("simultaneous CoW to %" PRIx64 "\n", aio_req->oid); |
1216 |
QLIST_REMOVE(aio_req, aio_siblings); |
1217 |
QLIST_INSERT_HEAD(&s->pending_aio_head, aio_req, aio_siblings); |
1218 |
return SD_RES_SUCCESS;
|
1219 |
} |
1220 |
} |
1221 |
|
1222 |
aio_req->base_oid = vid_to_data_oid(s->inode.data_vdi_id[idx], idx); |
1223 |
aio_req->flags |= SD_FLAG_CMD_COW; |
1224 |
create = true;
|
1225 |
} |
1226 |
out:
|
1227 |
return add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
|
1228 |
create, acb->aiocb_type); |
1229 |
} |
1230 |
|
1231 |
/* TODO Convert to fine grained options */
|
1232 |
static QemuOptsList runtime_opts = {
|
1233 |
.name = "sheepdog",
|
1234 |
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), |
1235 |
.desc = { |
1236 |
{ |
1237 |
.name = "filename",
|
1238 |
.type = QEMU_OPT_STRING, |
1239 |
.help = "URL to the sheepdog image",
|
1240 |
}, |
1241 |
{ /* end of list */ }
|
1242 |
}, |
1243 |
}; |
1244 |
|
1245 |
static int sd_open(BlockDriverState *bs, QDict *options, int flags, |
1246 |
Error **errp) |
1247 |
{ |
1248 |
int ret, fd;
|
1249 |
uint32_t vid = 0;
|
1250 |
BDRVSheepdogState *s = bs->opaque; |
1251 |
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
|
1252 |
uint32_t snapid; |
1253 |
char *buf = NULL; |
1254 |
QemuOpts *opts; |
1255 |
Error *local_err = NULL;
|
1256 |
const char *filename; |
1257 |
|
1258 |
opts = qemu_opts_create_nofail(&runtime_opts); |
1259 |
qemu_opts_absorb_qdict(opts, options, &local_err); |
1260 |
if (error_is_set(&local_err)) {
|
1261 |
qerror_report_err(local_err); |
1262 |
error_free(local_err); |
1263 |
ret = -EINVAL; |
1264 |
goto out;
|
1265 |
} |
1266 |
|
1267 |
filename = qemu_opt_get(opts, "filename");
|
1268 |
|
1269 |
QLIST_INIT(&s->inflight_aio_head); |
1270 |
QLIST_INIT(&s->pending_aio_head); |
1271 |
s->fd = -1;
|
1272 |
|
1273 |
memset(vdi, 0, sizeof(vdi)); |
1274 |
memset(tag, 0, sizeof(tag)); |
1275 |
|
1276 |
if (strstr(filename, "://")) { |
1277 |
ret = sd_parse_uri(s, filename, vdi, &snapid, tag); |
1278 |
} else {
|
1279 |
ret = parse_vdiname(s, filename, vdi, &snapid, tag); |
1280 |
} |
1281 |
if (ret < 0) { |
1282 |
goto out;
|
1283 |
} |
1284 |
s->fd = get_sheep_fd(s); |
1285 |
if (s->fd < 0) { |
1286 |
ret = s->fd; |
1287 |
goto out;
|
1288 |
} |
1289 |
|
1290 |
ret = find_vdi_name(s, vdi, snapid, tag, &vid, true);
|
1291 |
if (ret) {
|
1292 |
goto out;
|
1293 |
} |
1294 |
|
1295 |
/*
|
1296 |
* QEMU block layer emulates writethrough cache as 'writeback + flush', so
|
1297 |
* we always set SD_FLAG_CMD_CACHE (writeback cache) as default.
|
1298 |
*/
|
1299 |
s->cache_flags = SD_FLAG_CMD_CACHE; |
1300 |
if (flags & BDRV_O_NOCACHE) {
|
1301 |
s->cache_flags = SD_FLAG_CMD_DIRECT; |
1302 |
} |
1303 |
s->discard_supported = true;
|
1304 |
|
1305 |
if (snapid || tag[0] != '\0') { |
1306 |
DPRINTF("%" PRIx32 " snapshot inode was open.\n", vid); |
1307 |
s->is_snapshot = true;
|
1308 |
} |
1309 |
|
1310 |
fd = connect_to_sdog(s); |
1311 |
if (fd < 0) { |
1312 |
ret = fd; |
1313 |
goto out;
|
1314 |
} |
1315 |
|
1316 |
buf = g_malloc(SD_INODE_SIZE); |
1317 |
ret = read_object(fd, buf, vid_to_vdi_oid(vid), 0, SD_INODE_SIZE, 0, |
1318 |
s->cache_flags); |
1319 |
|
1320 |
closesocket(fd); |
1321 |
|
1322 |
if (ret) {
|
1323 |
goto out;
|
1324 |
} |
1325 |
|
1326 |
memcpy(&s->inode, buf, sizeof(s->inode));
|
1327 |
s->min_dirty_data_idx = UINT32_MAX; |
1328 |
s->max_dirty_data_idx = 0;
|
1329 |
|
1330 |
bs->total_sectors = s->inode.vdi_size / BDRV_SECTOR_SIZE; |
1331 |
pstrcpy(s->name, sizeof(s->name), vdi);
|
1332 |
qemu_co_mutex_init(&s->lock); |
1333 |
qemu_opts_del(opts); |
1334 |
g_free(buf); |
1335 |
return 0; |
1336 |
out:
|
1337 |
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL); |
1338 |
if (s->fd >= 0) { |
1339 |
closesocket(s->fd); |
1340 |
} |
1341 |
qemu_opts_del(opts); |
1342 |
g_free(buf); |
1343 |
return ret;
|
1344 |
} |
1345 |
|
1346 |
static int do_sd_create(BDRVSheepdogState *s, char *filename, int64_t vdi_size, |
1347 |
uint32_t base_vid, uint32_t *vdi_id, int snapshot)
|
1348 |
{ |
1349 |
SheepdogVdiReq hdr; |
1350 |
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
1351 |
int fd, ret;
|
1352 |
unsigned int wlen, rlen = 0; |
1353 |
char buf[SD_MAX_VDI_LEN];
|
1354 |
|
1355 |
fd = connect_to_sdog(s); |
1356 |
if (fd < 0) { |
1357 |
return fd;
|
1358 |
} |
1359 |
|
1360 |
/* FIXME: would it be better to fail (e.g., return -EIO) when filename
|
1361 |
* does not fit in buf? For now, just truncate and avoid buffer overrun.
|
1362 |
*/
|
1363 |
memset(buf, 0, sizeof(buf)); |
1364 |
pstrcpy(buf, sizeof(buf), filename);
|
1365 |
|
1366 |
memset(&hdr, 0, sizeof(hdr)); |
1367 |
hdr.opcode = SD_OP_NEW_VDI; |
1368 |
hdr.vdi_id = base_vid; |
1369 |
|
1370 |
wlen = SD_MAX_VDI_LEN; |
1371 |
|
1372 |
hdr.flags = SD_FLAG_CMD_WRITE; |
1373 |
hdr.snapid = snapshot; |
1374 |
|
1375 |
hdr.data_length = wlen; |
1376 |
hdr.vdi_size = vdi_size; |
1377 |
|
1378 |
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); |
1379 |
|
1380 |
closesocket(fd); |
1381 |
|
1382 |
if (ret) {
|
1383 |
return ret;
|
1384 |
} |
1385 |
|
1386 |
if (rsp->result != SD_RES_SUCCESS) {
|
1387 |
error_report("%s, %s", sd_strerror(rsp->result), filename);
|
1388 |
return -EIO;
|
1389 |
} |
1390 |
|
1391 |
if (vdi_id) {
|
1392 |
*vdi_id = rsp->vdi_id; |
1393 |
} |
1394 |
|
1395 |
return 0; |
1396 |
} |
1397 |
|
1398 |
static int sd_prealloc(const char *filename) |
1399 |
{ |
1400 |
BlockDriverState *bs = NULL;
|
1401 |
uint32_t idx, max_idx; |
1402 |
int64_t vdi_size; |
1403 |
void *buf = g_malloc0(SD_DATA_OBJ_SIZE);
|
1404 |
Error *local_err = NULL;
|
1405 |
int ret;
|
1406 |
|
1407 |
ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR, &local_err);
|
1408 |
if (ret < 0) { |
1409 |
qerror_report_err(local_err); |
1410 |
error_free(local_err); |
1411 |
goto out;
|
1412 |
} |
1413 |
|
1414 |
vdi_size = bdrv_getlength(bs); |
1415 |
if (vdi_size < 0) { |
1416 |
ret = vdi_size; |
1417 |
goto out;
|
1418 |
} |
1419 |
max_idx = DIV_ROUND_UP(vdi_size, SD_DATA_OBJ_SIZE); |
1420 |
|
1421 |
for (idx = 0; idx < max_idx; idx++) { |
1422 |
/*
|
1423 |
* The created image can be a cloned image, so we need to read
|
1424 |
* a data from the source image.
|
1425 |
*/
|
1426 |
ret = bdrv_pread(bs, idx * SD_DATA_OBJ_SIZE, buf, SD_DATA_OBJ_SIZE); |
1427 |
if (ret < 0) { |
1428 |
goto out;
|
1429 |
} |
1430 |
ret = bdrv_pwrite(bs, idx * SD_DATA_OBJ_SIZE, buf, SD_DATA_OBJ_SIZE); |
1431 |
if (ret < 0) { |
1432 |
goto out;
|
1433 |
} |
1434 |
} |
1435 |
out:
|
1436 |
if (bs) {
|
1437 |
bdrv_unref(bs); |
1438 |
} |
1439 |
g_free(buf); |
1440 |
|
1441 |
return ret;
|
1442 |
} |
1443 |
|
1444 |
static int sd_create(const char *filename, QEMUOptionParameter *options, |
1445 |
Error **errp) |
1446 |
{ |
1447 |
int ret = 0; |
1448 |
uint32_t vid = 0, base_vid = 0; |
1449 |
int64_t vdi_size = 0;
|
1450 |
char *backing_file = NULL; |
1451 |
BDRVSheepdogState *s; |
1452 |
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
|
1453 |
uint32_t snapid; |
1454 |
bool prealloc = false; |
1455 |
Error *local_err = NULL;
|
1456 |
|
1457 |
s = g_malloc0(sizeof(BDRVSheepdogState));
|
1458 |
|
1459 |
memset(vdi, 0, sizeof(vdi)); |
1460 |
memset(tag, 0, sizeof(tag)); |
1461 |
if (strstr(filename, "://")) { |
1462 |
ret = sd_parse_uri(s, filename, vdi, &snapid, tag); |
1463 |
} else {
|
1464 |
ret = parse_vdiname(s, filename, vdi, &snapid, tag); |
1465 |
} |
1466 |
if (ret < 0) { |
1467 |
goto out;
|
1468 |
} |
1469 |
|
1470 |
while (options && options->name) {
|
1471 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1472 |
vdi_size = options->value.n; |
1473 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1474 |
backing_file = options->value.s; |
1475 |
} else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { |
1476 |
if (!options->value.s || !strcmp(options->value.s, "off")) { |
1477 |
prealloc = false;
|
1478 |
} else if (!strcmp(options->value.s, "full")) { |
1479 |
prealloc = true;
|
1480 |
} else {
|
1481 |
error_report("Invalid preallocation mode: '%s'",
|
1482 |
options->value.s); |
1483 |
ret = -EINVAL; |
1484 |
goto out;
|
1485 |
} |
1486 |
} |
1487 |
options++; |
1488 |
} |
1489 |
|
1490 |
if (vdi_size > SD_MAX_VDI_SIZE) {
|
1491 |
error_report("too big image size");
|
1492 |
ret = -EINVAL; |
1493 |
goto out;
|
1494 |
} |
1495 |
|
1496 |
if (backing_file) {
|
1497 |
BlockDriverState *bs; |
1498 |
BDRVSheepdogState *s; |
1499 |
BlockDriver *drv; |
1500 |
|
1501 |
/* Currently, only Sheepdog backing image is supported. */
|
1502 |
drv = bdrv_find_protocol(backing_file, true);
|
1503 |
if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) { |
1504 |
error_report("backing_file must be a sheepdog image");
|
1505 |
ret = -EINVAL; |
1506 |
goto out;
|
1507 |
} |
1508 |
|
1509 |
ret = bdrv_file_open(&bs, backing_file, NULL, 0, &local_err); |
1510 |
if (ret < 0) { |
1511 |
qerror_report_err(local_err); |
1512 |
error_free(local_err); |
1513 |
goto out;
|
1514 |
} |
1515 |
|
1516 |
s = bs->opaque; |
1517 |
|
1518 |
if (!is_snapshot(&s->inode)) {
|
1519 |
error_report("cannot clone from a non snapshot vdi");
|
1520 |
bdrv_unref(bs); |
1521 |
ret = -EINVAL; |
1522 |
goto out;
|
1523 |
} |
1524 |
|
1525 |
base_vid = s->inode.vdi_id; |
1526 |
bdrv_unref(bs); |
1527 |
} |
1528 |
|
1529 |
ret = do_sd_create(s, vdi, vdi_size, base_vid, &vid, 0);
|
1530 |
if (!prealloc || ret) {
|
1531 |
goto out;
|
1532 |
} |
1533 |
|
1534 |
ret = sd_prealloc(filename); |
1535 |
out:
|
1536 |
g_free(s); |
1537 |
return ret;
|
1538 |
} |
1539 |
|
1540 |
static void sd_close(BlockDriverState *bs) |
1541 |
{ |
1542 |
BDRVSheepdogState *s = bs->opaque; |
1543 |
SheepdogVdiReq hdr; |
1544 |
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
1545 |
unsigned int wlen, rlen = 0; |
1546 |
int fd, ret;
|
1547 |
|
1548 |
DPRINTF("%s\n", s->name);
|
1549 |
|
1550 |
fd = connect_to_sdog(s); |
1551 |
if (fd < 0) { |
1552 |
return;
|
1553 |
} |
1554 |
|
1555 |
memset(&hdr, 0, sizeof(hdr)); |
1556 |
|
1557 |
hdr.opcode = SD_OP_RELEASE_VDI; |
1558 |
hdr.vdi_id = s->inode.vdi_id; |
1559 |
wlen = strlen(s->name) + 1;
|
1560 |
hdr.data_length = wlen; |
1561 |
hdr.flags = SD_FLAG_CMD_WRITE; |
1562 |
|
1563 |
ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen); |
1564 |
|
1565 |
closesocket(fd); |
1566 |
|
1567 |
if (!ret && rsp->result != SD_RES_SUCCESS &&
|
1568 |
rsp->result != SD_RES_VDI_NOT_LOCKED) { |
1569 |
error_report("%s, %s", sd_strerror(rsp->result), s->name);
|
1570 |
} |
1571 |
|
1572 |
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL); |
1573 |
closesocket(s->fd); |
1574 |
g_free(s->host_spec); |
1575 |
} |
1576 |
|
1577 |
static int64_t sd_getlength(BlockDriverState *bs)
|
1578 |
{ |
1579 |
BDRVSheepdogState *s = bs->opaque; |
1580 |
|
1581 |
return s->inode.vdi_size;
|
1582 |
} |
1583 |
|
1584 |
static int sd_truncate(BlockDriverState *bs, int64_t offset) |
1585 |
{ |
1586 |
BDRVSheepdogState *s = bs->opaque; |
1587 |
int ret, fd;
|
1588 |
unsigned int datalen; |
1589 |
|
1590 |
if (offset < s->inode.vdi_size) {
|
1591 |
error_report("shrinking is not supported");
|
1592 |
return -EINVAL;
|
1593 |
} else if (offset > SD_MAX_VDI_SIZE) { |
1594 |
error_report("too big image size");
|
1595 |
return -EINVAL;
|
1596 |
} |
1597 |
|
1598 |
fd = connect_to_sdog(s); |
1599 |
if (fd < 0) { |
1600 |
return fd;
|
1601 |
} |
1602 |
|
1603 |
/* we don't need to update entire object */
|
1604 |
datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
|
1605 |
s->inode.vdi_size = offset; |
1606 |
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
|
1607 |
s->inode.nr_copies, datalen, 0, false, s->cache_flags); |
1608 |
close(fd); |
1609 |
|
1610 |
if (ret < 0) { |
1611 |
error_report("failed to update an inode.");
|
1612 |
} |
1613 |
|
1614 |
return ret;
|
1615 |
} |
1616 |
|
1617 |
/*
|
1618 |
* This function is called after writing data objects. If we need to
|
1619 |
* update metadata, this sends a write request to the vdi object.
|
1620 |
* Otherwise, this switches back to sd_co_readv/writev.
|
1621 |
*/
|
1622 |
static void coroutine_fn sd_write_done(SheepdogAIOCB *acb) |
1623 |
{ |
1624 |
int ret;
|
1625 |
BDRVSheepdogState *s = acb->common.bs->opaque; |
1626 |
struct iovec iov;
|
1627 |
AIOReq *aio_req; |
1628 |
uint32_t offset, data_len, mn, mx; |
1629 |
|
1630 |
mn = s->min_dirty_data_idx; |
1631 |
mx = s->max_dirty_data_idx; |
1632 |
if (mn <= mx) {
|
1633 |
/* we need to update the vdi object. */
|
1634 |
offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) + |
1635 |
mn * sizeof(s->inode.data_vdi_id[0]); |
1636 |
data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]); |
1637 |
|
1638 |
s->min_dirty_data_idx = UINT32_MAX; |
1639 |
s->max_dirty_data_idx = 0;
|
1640 |
|
1641 |
iov.iov_base = &s->inode; |
1642 |
iov.iov_len = sizeof(s->inode);
|
1643 |
aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id), |
1644 |
data_len, offset, 0, 0, offset); |
1645 |
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); |
1646 |
ret = add_aio_request(s, aio_req, &iov, 1, false, AIOCB_WRITE_UDATA); |
1647 |
if (ret) {
|
1648 |
free_aio_req(s, aio_req); |
1649 |
acb->ret = -EIO; |
1650 |
goto out;
|
1651 |
} |
1652 |
|
1653 |
acb->aio_done_func = sd_finish_aiocb; |
1654 |
acb->aiocb_type = AIOCB_WRITE_UDATA; |
1655 |
return;
|
1656 |
} |
1657 |
out:
|
1658 |
sd_finish_aiocb(acb); |
1659 |
} |
1660 |
|
1661 |
/* Delete current working VDI on the snapshot chain */
|
1662 |
static bool sd_delete(BDRVSheepdogState *s) |
1663 |
{ |
1664 |
unsigned int wlen = SD_MAX_VDI_LEN, rlen = 0; |
1665 |
SheepdogVdiReq hdr = { |
1666 |
.opcode = SD_OP_DEL_VDI, |
1667 |
.vdi_id = s->inode.vdi_id, |
1668 |
.data_length = wlen, |
1669 |
.flags = SD_FLAG_CMD_WRITE, |
1670 |
}; |
1671 |
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
1672 |
int fd, ret;
|
1673 |
|
1674 |
fd = connect_to_sdog(s); |
1675 |
if (fd < 0) { |
1676 |
return false; |
1677 |
} |
1678 |
|
1679 |
ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen); |
1680 |
closesocket(fd); |
1681 |
if (ret) {
|
1682 |
return false; |
1683 |
} |
1684 |
switch (rsp->result) {
|
1685 |
case SD_RES_NO_VDI:
|
1686 |
error_report("%s was already deleted", s->name);
|
1687 |
/* fall through */
|
1688 |
case SD_RES_SUCCESS:
|
1689 |
break;
|
1690 |
default:
|
1691 |
error_report("%s, %s", sd_strerror(rsp->result), s->name);
|
1692 |
return false; |
1693 |
} |
1694 |
|
1695 |
return true; |
1696 |
} |
1697 |
|
1698 |
/*
|
1699 |
* Create a writable VDI from a snapshot
|
1700 |
*/
|
1701 |
static int sd_create_branch(BDRVSheepdogState *s) |
1702 |
{ |
1703 |
int ret, fd;
|
1704 |
uint32_t vid; |
1705 |
char *buf;
|
1706 |
bool deleted;
|
1707 |
|
1708 |
DPRINTF("%" PRIx32 " is snapshot.\n", s->inode.vdi_id); |
1709 |
|
1710 |
buf = g_malloc(SD_INODE_SIZE); |
1711 |
|
1712 |
/*
|
1713 |
* Even If deletion fails, we will just create extra snapshot based on
|
1714 |
* the workding VDI which was supposed to be deleted. So no need to
|
1715 |
* false bail out.
|
1716 |
*/
|
1717 |
deleted = sd_delete(s); |
1718 |
ret = do_sd_create(s, s->name, s->inode.vdi_size, s->inode.vdi_id, &vid, |
1719 |
!deleted); |
1720 |
if (ret) {
|
1721 |
goto out;
|
1722 |
} |
1723 |
|
1724 |
DPRINTF("%" PRIx32 " is created.\n", vid); |
1725 |
|
1726 |
fd = connect_to_sdog(s); |
1727 |
if (fd < 0) { |
1728 |
ret = fd; |
1729 |
goto out;
|
1730 |
} |
1731 |
|
1732 |
ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies, |
1733 |
SD_INODE_SIZE, 0, s->cache_flags);
|
1734 |
|
1735 |
closesocket(fd); |
1736 |
|
1737 |
if (ret < 0) { |
1738 |
goto out;
|
1739 |
} |
1740 |
|
1741 |
memcpy(&s->inode, buf, sizeof(s->inode));
|
1742 |
|
1743 |
s->is_snapshot = false;
|
1744 |
ret = 0;
|
1745 |
DPRINTF("%" PRIx32 " was newly created.\n", s->inode.vdi_id); |
1746 |
|
1747 |
out:
|
1748 |
g_free(buf); |
1749 |
|
1750 |
return ret;
|
1751 |
} |
1752 |
|
1753 |
/*
|
1754 |
* Send I/O requests to the server.
|
1755 |
*
|
1756 |
* This function sends requests to the server, links the requests to
|
1757 |
* the inflight_list in BDRVSheepdogState, and exits without
|
1758 |
* waiting the response. The responses are received in the
|
1759 |
* `aio_read_response' function which is called from the main loop as
|
1760 |
* a fd handler.
|
1761 |
*
|
1762 |
* Returns 1 when we need to wait a response, 0 when there is no sent
|
1763 |
* request and -errno in error cases.
|
1764 |
*/
|
1765 |
static int coroutine_fn sd_co_rw_vector(void *p) |
1766 |
{ |
1767 |
SheepdogAIOCB *acb = p; |
1768 |
int ret = 0; |
1769 |
unsigned long len, done = 0, total = acb->nb_sectors * BDRV_SECTOR_SIZE; |
1770 |
unsigned long idx = acb->sector_num * BDRV_SECTOR_SIZE / SD_DATA_OBJ_SIZE; |
1771 |
uint64_t oid; |
1772 |
uint64_t offset = (acb->sector_num * BDRV_SECTOR_SIZE) % SD_DATA_OBJ_SIZE; |
1773 |
BDRVSheepdogState *s = acb->common.bs->opaque; |
1774 |
SheepdogInode *inode = &s->inode; |
1775 |
AIOReq *aio_req; |
1776 |
|
1777 |
if (acb->aiocb_type == AIOCB_WRITE_UDATA && s->is_snapshot) {
|
1778 |
/*
|
1779 |
* In the case we open the snapshot VDI, Sheepdog creates the
|
1780 |
* writable VDI when we do a write operation first.
|
1781 |
*/
|
1782 |
ret = sd_create_branch(s); |
1783 |
if (ret) {
|
1784 |
acb->ret = -EIO; |
1785 |
goto out;
|
1786 |
} |
1787 |
} |
1788 |
|
1789 |
/*
|
1790 |
* Make sure we don't free the aiocb before we are done with all requests.
|
1791 |
* This additional reference is dropped at the end of this function.
|
1792 |
*/
|
1793 |
acb->nr_pending++; |
1794 |
|
1795 |
while (done != total) {
|
1796 |
uint8_t flags = 0;
|
1797 |
uint64_t old_oid = 0;
|
1798 |
bool create = false; |
1799 |
|
1800 |
oid = vid_to_data_oid(inode->data_vdi_id[idx], idx); |
1801 |
|
1802 |
len = MIN(total - done, SD_DATA_OBJ_SIZE - offset); |
1803 |
|
1804 |
switch (acb->aiocb_type) {
|
1805 |
case AIOCB_READ_UDATA:
|
1806 |
if (!inode->data_vdi_id[idx]) {
|
1807 |
qemu_iovec_memset(acb->qiov, done, 0, len);
|
1808 |
goto done;
|
1809 |
} |
1810 |
break;
|
1811 |
case AIOCB_WRITE_UDATA:
|
1812 |
if (!inode->data_vdi_id[idx]) {
|
1813 |
create = true;
|
1814 |
} else if (!is_data_obj_writable(inode, idx)) { |
1815 |
/* Copy-On-Write */
|
1816 |
create = true;
|
1817 |
old_oid = oid; |
1818 |
flags = SD_FLAG_CMD_COW; |
1819 |
} |
1820 |
break;
|
1821 |
case AIOCB_DISCARD_OBJ:
|
1822 |
/*
|
1823 |
* We discard the object only when the whole object is
|
1824 |
* 1) allocated 2) trimmed. Otherwise, simply skip it.
|
1825 |
*/
|
1826 |
if (len != SD_DATA_OBJ_SIZE || inode->data_vdi_id[idx] == 0) { |
1827 |
goto done;
|
1828 |
} |
1829 |
break;
|
1830 |
default:
|
1831 |
break;
|
1832 |
} |
1833 |
|
1834 |
if (create) {
|
1835 |
DPRINTF("update ino (%" PRIu32 ") %" PRIu64 " %" PRIu64 " %ld\n", |
1836 |
inode->vdi_id, oid, |
1837 |
vid_to_data_oid(inode->data_vdi_id[idx], idx), idx); |
1838 |
oid = vid_to_data_oid(inode->vdi_id, idx); |
1839 |
DPRINTF("new oid %" PRIx64 "\n", oid); |
1840 |
} |
1841 |
|
1842 |
aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, old_oid, done); |
1843 |
|
1844 |
if (create) {
|
1845 |
AIOReq *areq; |
1846 |
QLIST_FOREACH(areq, &s->inflight_aio_head, aio_siblings) { |
1847 |
if (areq->oid == oid) {
|
1848 |
/*
|
1849 |
* Sheepdog cannot handle simultaneous create
|
1850 |
* requests to the same object. So we cannot send
|
1851 |
* the request until the previous request
|
1852 |
* finishes.
|
1853 |
*/
|
1854 |
aio_req->flags = 0;
|
1855 |
aio_req->base_oid = 0;
|
1856 |
QLIST_INSERT_HEAD(&s->pending_aio_head, aio_req, |
1857 |
aio_siblings); |
1858 |
goto done;
|
1859 |
} |
1860 |
} |
1861 |
} |
1862 |
|
1863 |
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); |
1864 |
ret = add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov, |
1865 |
create, acb->aiocb_type); |
1866 |
if (ret < 0) { |
1867 |
error_report("add_aio_request is failed");
|
1868 |
free_aio_req(s, aio_req); |
1869 |
acb->ret = -EIO; |
1870 |
goto out;
|
1871 |
} |
1872 |
done:
|
1873 |
offset = 0;
|
1874 |
idx++; |
1875 |
done += len; |
1876 |
} |
1877 |
out:
|
1878 |
if (!--acb->nr_pending) {
|
1879 |
return acb->ret;
|
1880 |
} |
1881 |
return 1; |
1882 |
} |
1883 |
|
1884 |
static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num, |
1885 |
int nb_sectors, QEMUIOVector *qiov)
|
1886 |
{ |
1887 |
SheepdogAIOCB *acb; |
1888 |
int ret;
|
1889 |
|
1890 |
if (bs->growable && sector_num + nb_sectors > bs->total_sectors) {
|
1891 |
ret = sd_truncate(bs, (sector_num + nb_sectors) * BDRV_SECTOR_SIZE); |
1892 |
if (ret < 0) { |
1893 |
return ret;
|
1894 |
} |
1895 |
bs->total_sectors = sector_num + nb_sectors; |
1896 |
} |
1897 |
|
1898 |
acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors); |
1899 |
acb->aio_done_func = sd_write_done; |
1900 |
acb->aiocb_type = AIOCB_WRITE_UDATA; |
1901 |
|
1902 |
ret = sd_co_rw_vector(acb); |
1903 |
if (ret <= 0) { |
1904 |
qemu_aio_release(acb); |
1905 |
return ret;
|
1906 |
} |
1907 |
|
1908 |
qemu_coroutine_yield(); |
1909 |
|
1910 |
return acb->ret;
|
1911 |
} |
1912 |
|
1913 |
static coroutine_fn int sd_co_readv(BlockDriverState *bs, int64_t sector_num, |
1914 |
int nb_sectors, QEMUIOVector *qiov)
|
1915 |
{ |
1916 |
SheepdogAIOCB *acb; |
1917 |
int ret;
|
1918 |
|
1919 |
acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors); |
1920 |
acb->aiocb_type = AIOCB_READ_UDATA; |
1921 |
acb->aio_done_func = sd_finish_aiocb; |
1922 |
|
1923 |
ret = sd_co_rw_vector(acb); |
1924 |
if (ret <= 0) { |
1925 |
qemu_aio_release(acb); |
1926 |
return ret;
|
1927 |
} |
1928 |
|
1929 |
qemu_coroutine_yield(); |
1930 |
|
1931 |
return acb->ret;
|
1932 |
} |
1933 |
|
1934 |
static int coroutine_fn sd_co_flush_to_disk(BlockDriverState *bs) |
1935 |
{ |
1936 |
BDRVSheepdogState *s = bs->opaque; |
1937 |
SheepdogAIOCB *acb; |
1938 |
AIOReq *aio_req; |
1939 |
int ret;
|
1940 |
|
1941 |
if (s->cache_flags != SD_FLAG_CMD_CACHE) {
|
1942 |
return 0; |
1943 |
} |
1944 |
|
1945 |
acb = sd_aio_setup(bs, NULL, 0, 0); |
1946 |
acb->aiocb_type = AIOCB_FLUSH_CACHE; |
1947 |
acb->aio_done_func = sd_finish_aiocb; |
1948 |
|
1949 |
aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id), |
1950 |
0, 0, 0, 0, 0); |
1951 |
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); |
1952 |
ret = add_aio_request(s, aio_req, NULL, 0, false, acb->aiocb_type); |
1953 |
if (ret < 0) { |
1954 |
error_report("add_aio_request is failed");
|
1955 |
free_aio_req(s, aio_req); |
1956 |
qemu_aio_release(acb); |
1957 |
return ret;
|
1958 |
} |
1959 |
|
1960 |
qemu_coroutine_yield(); |
1961 |
return acb->ret;
|
1962 |
} |
1963 |
|
1964 |
static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) |
1965 |
{ |
1966 |
BDRVSheepdogState *s = bs->opaque; |
1967 |
int ret, fd;
|
1968 |
uint32_t new_vid; |
1969 |
SheepdogInode *inode; |
1970 |
unsigned int datalen; |
1971 |
|
1972 |
DPRINTF("sn_info: name %s id_str %s s: name %s vm_state_size %" PRId64 " " |
1973 |
"is_snapshot %d\n", sn_info->name, sn_info->id_str,
|
1974 |
s->name, sn_info->vm_state_size, s->is_snapshot); |
1975 |
|
1976 |
if (s->is_snapshot) {
|
1977 |
error_report("You can't create a snapshot of a snapshot VDI, "
|
1978 |
"%s (%" PRIu32 ").", s->name, s->inode.vdi_id); |
1979 |
|
1980 |
return -EINVAL;
|
1981 |
} |
1982 |
|
1983 |
DPRINTF("%s %s\n", sn_info->name, sn_info->id_str);
|
1984 |
|
1985 |
s->inode.vm_state_size = sn_info->vm_state_size; |
1986 |
s->inode.vm_clock_nsec = sn_info->vm_clock_nsec; |
1987 |
/* It appears that inode.tag does not require a NUL terminator,
|
1988 |
* which means this use of strncpy is ok.
|
1989 |
*/
|
1990 |
strncpy(s->inode.tag, sn_info->name, sizeof(s->inode.tag));
|
1991 |
/* we don't need to update entire object */
|
1992 |
datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
|
1993 |
|
1994 |
/* refresh inode. */
|
1995 |
fd = connect_to_sdog(s); |
1996 |
if (fd < 0) { |
1997 |
ret = fd; |
1998 |
goto cleanup;
|
1999 |
} |
2000 |
|
2001 |
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
|
2002 |
s->inode.nr_copies, datalen, 0, false, s->cache_flags); |
2003 |
if (ret < 0) { |
2004 |
error_report("failed to write snapshot's inode.");
|
2005 |
goto cleanup;
|
2006 |
} |
2007 |
|
2008 |
ret = do_sd_create(s, s->name, s->inode.vdi_size, s->inode.vdi_id, &new_vid, |
2009 |
1);
|
2010 |
if (ret < 0) { |
2011 |
error_report("failed to create inode for snapshot. %s",
|
2012 |
strerror(errno)); |
2013 |
goto cleanup;
|
2014 |
} |
2015 |
|
2016 |
inode = (SheepdogInode *)g_malloc(datalen); |
2017 |
|
2018 |
ret = read_object(fd, (char *)inode, vid_to_vdi_oid(new_vid),
|
2019 |
s->inode.nr_copies, datalen, 0, s->cache_flags);
|
2020 |
|
2021 |
if (ret < 0) { |
2022 |
error_report("failed to read new inode info. %s", strerror(errno));
|
2023 |
goto cleanup;
|
2024 |
} |
2025 |
|
2026 |
memcpy(&s->inode, inode, datalen); |
2027 |
DPRINTF("s->inode: name %s snap_id %x oid %x\n",
|
2028 |
s->inode.name, s->inode.snap_id, s->inode.vdi_id); |
2029 |
|
2030 |
cleanup:
|
2031 |
closesocket(fd); |
2032 |
return ret;
|
2033 |
} |
2034 |
|
2035 |
/*
|
2036 |
* We implement rollback(loadvm) operation to the specified snapshot by
|
2037 |
* 1) switch to the snapshot
|
2038 |
* 2) rely on sd_create_branch to delete working VDI and
|
2039 |
* 3) create a new working VDI based on the speicified snapshot
|
2040 |
*/
|
2041 |
static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id) |
2042 |
{ |
2043 |
BDRVSheepdogState *s = bs->opaque; |
2044 |
BDRVSheepdogState *old_s; |
2045 |
char tag[SD_MAX_VDI_TAG_LEN];
|
2046 |
uint32_t snapid = 0;
|
2047 |
int ret = 0; |
2048 |
|
2049 |
old_s = g_malloc(sizeof(BDRVSheepdogState));
|
2050 |
|
2051 |
memcpy(old_s, s, sizeof(BDRVSheepdogState));
|
2052 |
|
2053 |
snapid = strtoul(snapshot_id, NULL, 10); |
2054 |
if (snapid) {
|
2055 |
tag[0] = 0; |
2056 |
} else {
|
2057 |
pstrcpy(tag, sizeof(tag), snapshot_id);
|
2058 |
} |
2059 |
|
2060 |
ret = reload_inode(s, snapid, tag); |
2061 |
if (ret) {
|
2062 |
goto out;
|
2063 |
} |
2064 |
|
2065 |
ret = sd_create_branch(s); |
2066 |
if (ret) {
|
2067 |
goto out;
|
2068 |
} |
2069 |
|
2070 |
g_free(old_s); |
2071 |
|
2072 |
return 0; |
2073 |
out:
|
2074 |
/* recover bdrv_sd_state */
|
2075 |
memcpy(s, old_s, sizeof(BDRVSheepdogState));
|
2076 |
g_free(old_s); |
2077 |
|
2078 |
error_report("failed to open. recover old bdrv_sd_state.");
|
2079 |
|
2080 |
return ret;
|
2081 |
} |
2082 |
|
2083 |
static int sd_snapshot_delete(BlockDriverState *bs, |
2084 |
const char *snapshot_id, |
2085 |
const char *name, |
2086 |
Error **errp) |
2087 |
{ |
2088 |
/* FIXME: Delete specified snapshot id. */
|
2089 |
return 0; |
2090 |
} |
2091 |
|
2092 |
static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) |
2093 |
{ |
2094 |
BDRVSheepdogState *s = bs->opaque; |
2095 |
SheepdogReq req; |
2096 |
int fd, nr = 1024, ret, max = BITS_TO_LONGS(SD_NR_VDIS) * sizeof(long); |
2097 |
QEMUSnapshotInfo *sn_tab = NULL;
|
2098 |
unsigned wlen, rlen;
|
2099 |
int found = 0; |
2100 |
static SheepdogInode inode;
|
2101 |
unsigned long *vdi_inuse; |
2102 |
unsigned int start_nr; |
2103 |
uint64_t hval; |
2104 |
uint32_t vid; |
2105 |
|
2106 |
vdi_inuse = g_malloc(max); |
2107 |
|
2108 |
fd = connect_to_sdog(s); |
2109 |
if (fd < 0) { |
2110 |
ret = fd; |
2111 |
goto out;
|
2112 |
} |
2113 |
|
2114 |
rlen = max; |
2115 |
wlen = 0;
|
2116 |
|
2117 |
memset(&req, 0, sizeof(req)); |
2118 |
|
2119 |
req.opcode = SD_OP_READ_VDIS; |
2120 |
req.data_length = max; |
2121 |
|
2122 |
ret = do_req(fd, (SheepdogReq *)&req, vdi_inuse, &wlen, &rlen); |
2123 |
|
2124 |
closesocket(fd); |
2125 |
if (ret) {
|
2126 |
goto out;
|
2127 |
} |
2128 |
|
2129 |
sn_tab = g_malloc0(nr * sizeof(*sn_tab));
|
2130 |
|
2131 |
/* calculate a vdi id with hash function */
|
2132 |
hval = fnv_64a_buf(s->name, strlen(s->name), FNV1A_64_INIT); |
2133 |
start_nr = hval & (SD_NR_VDIS - 1);
|
2134 |
|
2135 |
fd = connect_to_sdog(s); |
2136 |
if (fd < 0) { |
2137 |
ret = fd; |
2138 |
goto out;
|
2139 |
} |
2140 |
|
2141 |
for (vid = start_nr; found < nr; vid = (vid + 1) % SD_NR_VDIS) { |
2142 |
if (!test_bit(vid, vdi_inuse)) {
|
2143 |
break;
|
2144 |
} |
2145 |
|
2146 |
/* we don't need to read entire object */
|
2147 |
ret = read_object(fd, (char *)&inode, vid_to_vdi_oid(vid),
|
2148 |
0, SD_INODE_SIZE - sizeof(inode.data_vdi_id), 0, |
2149 |
s->cache_flags); |
2150 |
|
2151 |
if (ret) {
|
2152 |
continue;
|
2153 |
} |
2154 |
|
2155 |
if (!strcmp(inode.name, s->name) && is_snapshot(&inode)) {
|
2156 |
sn_tab[found].date_sec = inode.snap_ctime >> 32;
|
2157 |
sn_tab[found].date_nsec = inode.snap_ctime & 0xffffffff;
|
2158 |
sn_tab[found].vm_state_size = inode.vm_state_size; |
2159 |
sn_tab[found].vm_clock_nsec = inode.vm_clock_nsec; |
2160 |
|
2161 |
snprintf(sn_tab[found].id_str, sizeof(sn_tab[found].id_str), "%u", |
2162 |
inode.snap_id); |
2163 |
pstrcpy(sn_tab[found].name, |
2164 |
MIN(sizeof(sn_tab[found].name), sizeof(inode.tag)), |
2165 |
inode.tag); |
2166 |
found++; |
2167 |
} |
2168 |
} |
2169 |
|
2170 |
closesocket(fd); |
2171 |
out:
|
2172 |
*psn_tab = sn_tab; |
2173 |
|
2174 |
g_free(vdi_inuse); |
2175 |
|
2176 |
if (ret < 0) { |
2177 |
return ret;
|
2178 |
} |
2179 |
|
2180 |
return found;
|
2181 |
} |
2182 |
|
2183 |
static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data, |
2184 |
int64_t pos, int size, int load) |
2185 |
{ |
2186 |
bool create;
|
2187 |
int fd, ret = 0, remaining = size; |
2188 |
unsigned int data_len; |
2189 |
uint64_t vmstate_oid; |
2190 |
uint64_t offset; |
2191 |
uint32_t vdi_index; |
2192 |
uint32_t vdi_id = load ? s->inode.parent_vdi_id : s->inode.vdi_id; |
2193 |
|
2194 |
fd = connect_to_sdog(s); |
2195 |
if (fd < 0) { |
2196 |
return fd;
|
2197 |
} |
2198 |
|
2199 |
while (remaining) {
|
2200 |
vdi_index = pos / SD_DATA_OBJ_SIZE; |
2201 |
offset = pos % SD_DATA_OBJ_SIZE; |
2202 |
|
2203 |
data_len = MIN(remaining, SD_DATA_OBJ_SIZE - offset); |
2204 |
|
2205 |
vmstate_oid = vid_to_vmstate_oid(vdi_id, vdi_index); |
2206 |
|
2207 |
create = (offset == 0);
|
2208 |
if (load) {
|
2209 |
ret = read_object(fd, (char *)data, vmstate_oid,
|
2210 |
s->inode.nr_copies, data_len, offset, |
2211 |
s->cache_flags); |
2212 |
} else {
|
2213 |
ret = write_object(fd, (char *)data, vmstate_oid,
|
2214 |
s->inode.nr_copies, data_len, offset, create, |
2215 |
s->cache_flags); |
2216 |
} |
2217 |
|
2218 |
if (ret < 0) { |
2219 |
error_report("failed to save vmstate %s", strerror(errno));
|
2220 |
goto cleanup;
|
2221 |
} |
2222 |
|
2223 |
pos += data_len; |
2224 |
data += data_len; |
2225 |
remaining -= data_len; |
2226 |
} |
2227 |
ret = size; |
2228 |
cleanup:
|
2229 |
closesocket(fd); |
2230 |
return ret;
|
2231 |
} |
2232 |
|
2233 |
static int sd_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
2234 |
int64_t pos) |
2235 |
{ |
2236 |
BDRVSheepdogState *s = bs->opaque; |
2237 |
void *buf;
|
2238 |
int ret;
|
2239 |
|
2240 |
buf = qemu_blockalign(bs, qiov->size); |
2241 |
qemu_iovec_to_buf(qiov, 0, buf, qiov->size);
|
2242 |
ret = do_load_save_vmstate(s, (uint8_t *) buf, pos, qiov->size, 0);
|
2243 |
qemu_vfree(buf); |
2244 |
|
2245 |
return ret;
|
2246 |
} |
2247 |
|
2248 |
static int sd_load_vmstate(BlockDriverState *bs, uint8_t *data, |
2249 |
int64_t pos, int size)
|
2250 |
{ |
2251 |
BDRVSheepdogState *s = bs->opaque; |
2252 |
|
2253 |
return do_load_save_vmstate(s, data, pos, size, 1); |
2254 |
} |
2255 |
|
2256 |
|
2257 |
static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num, |
2258 |
int nb_sectors)
|
2259 |
{ |
2260 |
SheepdogAIOCB *acb; |
2261 |
QEMUIOVector dummy; |
2262 |
BDRVSheepdogState *s = bs->opaque; |
2263 |
int ret;
|
2264 |
|
2265 |
if (!s->discard_supported) {
|
2266 |
return 0; |
2267 |
} |
2268 |
|
2269 |
acb = sd_aio_setup(bs, &dummy, sector_num, nb_sectors); |
2270 |
acb->aiocb_type = AIOCB_DISCARD_OBJ; |
2271 |
acb->aio_done_func = sd_finish_aiocb; |
2272 |
|
2273 |
ret = sd_co_rw_vector(acb); |
2274 |
if (ret <= 0) { |
2275 |
qemu_aio_release(acb); |
2276 |
return ret;
|
2277 |
} |
2278 |
|
2279 |
qemu_coroutine_yield(); |
2280 |
|
2281 |
return acb->ret;
|
2282 |
} |
2283 |
|
2284 |
static coroutine_fn int64_t
|
2285 |
sd_co_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
|
2286 |
int *pnum)
|
2287 |
{ |
2288 |
BDRVSheepdogState *s = bs->opaque; |
2289 |
SheepdogInode *inode = &s->inode; |
2290 |
unsigned long start = sector_num * BDRV_SECTOR_SIZE / SD_DATA_OBJ_SIZE, |
2291 |
end = DIV_ROUND_UP((sector_num + nb_sectors) * |
2292 |
BDRV_SECTOR_SIZE, SD_DATA_OBJ_SIZE); |
2293 |
unsigned long idx; |
2294 |
int64_t ret = BDRV_BLOCK_DATA; |
2295 |
|
2296 |
for (idx = start; idx < end; idx++) {
|
2297 |
if (inode->data_vdi_id[idx] == 0) { |
2298 |
break;
|
2299 |
} |
2300 |
} |
2301 |
if (idx == start) {
|
2302 |
/* Get the longest length of unallocated sectors */
|
2303 |
ret = 0;
|
2304 |
for (idx = start + 1; idx < end; idx++) { |
2305 |
if (inode->data_vdi_id[idx] != 0) { |
2306 |
break;
|
2307 |
} |
2308 |
} |
2309 |
} |
2310 |
|
2311 |
*pnum = (idx - start) * SD_DATA_OBJ_SIZE / BDRV_SECTOR_SIZE; |
2312 |
if (*pnum > nb_sectors) {
|
2313 |
*pnum = nb_sectors; |
2314 |
} |
2315 |
return ret;
|
2316 |
} |
2317 |
|
2318 |
static QEMUOptionParameter sd_create_options[] = {
|
2319 |
{ |
2320 |
.name = BLOCK_OPT_SIZE, |
2321 |
.type = OPT_SIZE, |
2322 |
.help = "Virtual disk size"
|
2323 |
}, |
2324 |
{ |
2325 |
.name = BLOCK_OPT_BACKING_FILE, |
2326 |
.type = OPT_STRING, |
2327 |
.help = "File name of a base image"
|
2328 |
}, |
2329 |
{ |
2330 |
.name = BLOCK_OPT_PREALLOC, |
2331 |
.type = OPT_STRING, |
2332 |
.help = "Preallocation mode (allowed values: off, full)"
|
2333 |
}, |
2334 |
{ NULL }
|
2335 |
}; |
2336 |
|
2337 |
static BlockDriver bdrv_sheepdog = {
|
2338 |
.format_name = "sheepdog",
|
2339 |
.protocol_name = "sheepdog",
|
2340 |
.instance_size = sizeof(BDRVSheepdogState),
|
2341 |
.bdrv_file_open = sd_open, |
2342 |
.bdrv_close = sd_close, |
2343 |
.bdrv_create = sd_create, |
2344 |
.bdrv_has_zero_init = bdrv_has_zero_init_1, |
2345 |
.bdrv_getlength = sd_getlength, |
2346 |
.bdrv_truncate = sd_truncate, |
2347 |
|
2348 |
.bdrv_co_readv = sd_co_readv, |
2349 |
.bdrv_co_writev = sd_co_writev, |
2350 |
.bdrv_co_flush_to_disk = sd_co_flush_to_disk, |
2351 |
.bdrv_co_discard = sd_co_discard, |
2352 |
.bdrv_co_get_block_status = sd_co_get_block_status, |
2353 |
|
2354 |
.bdrv_snapshot_create = sd_snapshot_create, |
2355 |
.bdrv_snapshot_goto = sd_snapshot_goto, |
2356 |
.bdrv_snapshot_delete = sd_snapshot_delete, |
2357 |
.bdrv_snapshot_list = sd_snapshot_list, |
2358 |
|
2359 |
.bdrv_save_vmstate = sd_save_vmstate, |
2360 |
.bdrv_load_vmstate = sd_load_vmstate, |
2361 |
|
2362 |
.create_options = sd_create_options, |
2363 |
}; |
2364 |
|
2365 |
static BlockDriver bdrv_sheepdog_tcp = {
|
2366 |
.format_name = "sheepdog",
|
2367 |
.protocol_name = "sheepdog+tcp",
|
2368 |
.instance_size = sizeof(BDRVSheepdogState),
|
2369 |
.bdrv_file_open = sd_open, |
2370 |
.bdrv_close = sd_close, |
2371 |
.bdrv_create = sd_create, |
2372 |
.bdrv_has_zero_init = bdrv_has_zero_init_1, |
2373 |
.bdrv_getlength = sd_getlength, |
2374 |
.bdrv_truncate = sd_truncate, |
2375 |
|
2376 |
.bdrv_co_readv = sd_co_readv, |
2377 |
.bdrv_co_writev = sd_co_writev, |
2378 |
.bdrv_co_flush_to_disk = sd_co_flush_to_disk, |
2379 |
.bdrv_co_discard = sd_co_discard, |
2380 |
.bdrv_co_get_block_status = sd_co_get_block_status, |
2381 |
|
2382 |
.bdrv_snapshot_create = sd_snapshot_create, |
2383 |
.bdrv_snapshot_goto = sd_snapshot_goto, |
2384 |
.bdrv_snapshot_delete = sd_snapshot_delete, |
2385 |
.bdrv_snapshot_list = sd_snapshot_list, |
2386 |
|
2387 |
.bdrv_save_vmstate = sd_save_vmstate, |
2388 |
.bdrv_load_vmstate = sd_load_vmstate, |
2389 |
|
2390 |
.create_options = sd_create_options, |
2391 |
}; |
2392 |
|
2393 |
static BlockDriver bdrv_sheepdog_unix = {
|
2394 |
.format_name = "sheepdog",
|
2395 |
.protocol_name = "sheepdog+unix",
|
2396 |
.instance_size = sizeof(BDRVSheepdogState),
|
2397 |
.bdrv_file_open = sd_open, |
2398 |
.bdrv_close = sd_close, |
2399 |
.bdrv_create = sd_create, |
2400 |
.bdrv_has_zero_init = bdrv_has_zero_init_1, |
2401 |
.bdrv_getlength = sd_getlength, |
2402 |
.bdrv_truncate = sd_truncate, |
2403 |
|
2404 |
.bdrv_co_readv = sd_co_readv, |
2405 |
.bdrv_co_writev = sd_co_writev, |
2406 |
.bdrv_co_flush_to_disk = sd_co_flush_to_disk, |
2407 |
.bdrv_co_discard = sd_co_discard, |
2408 |
.bdrv_co_get_block_status = sd_co_get_block_status, |
2409 |
|
2410 |
.bdrv_snapshot_create = sd_snapshot_create, |
2411 |
.bdrv_snapshot_goto = sd_snapshot_goto, |
2412 |
.bdrv_snapshot_delete = sd_snapshot_delete, |
2413 |
.bdrv_snapshot_list = sd_snapshot_list, |
2414 |
|
2415 |
.bdrv_save_vmstate = sd_save_vmstate, |
2416 |
.bdrv_load_vmstate = sd_load_vmstate, |
2417 |
|
2418 |
.create_options = sd_create_options, |
2419 |
}; |
2420 |
|
2421 |
static void bdrv_sheepdog_init(void) |
2422 |
{ |
2423 |
bdrv_register(&bdrv_sheepdog); |
2424 |
bdrv_register(&bdrv_sheepdog_tcp); |
2425 |
bdrv_register(&bdrv_sheepdog_unix); |
2426 |
} |
2427 |
block_init(bdrv_sheepdog_init); |