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f1af3251f8
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170629132749.997-11-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
3195 lines
87 KiB
C
3195 lines
87 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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* 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/osdep.h"
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#include "qapi-visit.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qobject-input-visitor.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 "sysemu/block-backend.h"
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#include "qemu/bitops.h"
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#include "qemu/cutils.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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/* 0x04 is used internally by Sheepdog */
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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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#define SD_OP_GET_CLUSTER_DEFAULT 0x18
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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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#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_DEFAULT_BLOCK_SIZE_SHIFT 22
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/*
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* For erasure coding, we use at most SD_EC_MAX_STRIP for data strips and
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* (SD_EC_MAX_STRIP - 1) for parity strips
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*
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* SD_MAX_COPIES is sum of number of data strips and parity strips.
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*/
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#define SD_EC_MAX_STRIP 16
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#define SD_MAX_COPIES (SD_EC_MAX_STRIP * 2 - 1)
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#define SD_INODE_SIZE (sizeof(SheepdogInode))
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#define CURRENT_VDI_ID 0
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#define LOCK_TYPE_NORMAL 0
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#define LOCK_TYPE_SHARED 1 /* for iSCSI multipath */
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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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uint8_t copies;
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uint8_t copy_policy;
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uint8_t reserved[6];
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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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uint8_t copies;
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uint8_t copy_policy;
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uint8_t reserved[2];
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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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uint8_t copies;
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uint8_t copy_policy;
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uint8_t store_policy;
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uint8_t block_size_shift;
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uint32_t snapid;
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uint32_t type;
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uint32_t pad[2];
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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 SheepdogClusterRsp {
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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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uint8_t nr_copies;
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uint8_t copy_policy;
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uint8_t block_size_shift;
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uint8_t __pad1;
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uint32_t __pad2[6];
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} SheepdogClusterRsp;
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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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#define SD_INODE_HEADER_SIZE offsetof(SheepdogInode, data_vdi_id)
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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 uint32_t oid_to_vid(uint64_t oid)
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{
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return (oid & ~VDI_BIT) >> VDI_SPACE_SHIFT;
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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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static inline size_t count_data_objs(const struct SheepdogInode *inode)
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{
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return DIV_ROUND_UP(inode->vdi_size,
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(1UL << inode->block_size_shift));
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}
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#undef DPRINTF
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#ifdef DEBUG_SDOG
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#define DEBUG_SDOG_PRINT 1
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#else
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#define DEBUG_SDOG_PRINT 0
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#endif
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#define DPRINTF(fmt, args...) \
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do { \
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if (DEBUG_SDOG_PRINT) { \
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fprintf(stderr, "%s %d: " fmt, __func__, __LINE__, ##args); \
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} \
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} while (0)
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typedef struct SheepdogAIOCB SheepdogAIOCB;
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typedef struct BDRVSheepdogState BDRVSheepdogState;
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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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bool create;
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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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#define AIOCBOverlapping(x, y) \
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(!(x->max_affect_data_idx < y->min_affect_data_idx \
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|| y->max_affect_data_idx < x->min_affect_data_idx))
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struct SheepdogAIOCB {
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BDRVSheepdogState *s;
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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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int nr_pending;
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uint32_t min_affect_data_idx;
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uint32_t max_affect_data_idx;
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/*
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* The difference between affect_data_idx and dirty_data_idx:
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* affect_data_idx represents range of index of all request types.
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* dirty_data_idx represents range of index updated by COW requests.
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* dirty_data_idx is used for updating an inode object.
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*/
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uint32_t min_dirty_data_idx;
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uint32_t max_dirty_data_idx;
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QLIST_ENTRY(SheepdogAIOCB) aiocb_siblings;
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};
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struct BDRVSheepdogState {
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BlockDriverState *bs;
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AioContext *aio_context;
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SheepdogInode inode;
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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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SocketAddress *addr;
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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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/* Every aio request must be linked to either of these queues. */
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QLIST_HEAD(inflight_aio_head, AIOReq) inflight_aio_head;
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QLIST_HEAD(failed_aio_head, AIOReq) failed_aio_head;
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CoMutex queue_lock;
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CoQueue overlapping_queue;
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QLIST_HEAD(inflight_aiocb_head, SheepdogAIOCB) inflight_aiocb_head;
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};
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typedef struct BDRVSheepdogReopenState {
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int fd;
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int cache_flags;
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} BDRVSheepdogReopenState;
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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) {
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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 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 yields while 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. We switch back to sd_co_readv/sd_writev
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* after all the requests belonging to the AIOCB are finished. If
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* needed, sd_co_writev will send another requests for the vdi object.
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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, bool create,
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uint64_t base_oid, unsigned int iov_offset)
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{
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AIOReq *aio_req;
|
|
|
|
aio_req = g_malloc(sizeof(*aio_req));
|
|
aio_req->aiocb = acb;
|
|
aio_req->iov_offset = iov_offset;
|
|
aio_req->oid = oid;
|
|
aio_req->base_oid = base_oid;
|
|
aio_req->offset = offset;
|
|
aio_req->data_len = data_len;
|
|
aio_req->flags = flags;
|
|
aio_req->id = s->aioreq_seq_num++;
|
|
aio_req->create = create;
|
|
|
|
acb->nr_pending++;
|
|
return aio_req;
|
|
}
|
|
|
|
static void wait_for_overlapping_aiocb(BDRVSheepdogState *s, SheepdogAIOCB *acb)
|
|
{
|
|
SheepdogAIOCB *cb;
|
|
|
|
retry:
|
|
QLIST_FOREACH(cb, &s->inflight_aiocb_head, aiocb_siblings) {
|
|
if (AIOCBOverlapping(acb, cb)) {
|
|
qemu_co_queue_wait(&s->overlapping_queue, &s->queue_lock);
|
|
goto retry;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void sd_aio_setup(SheepdogAIOCB *acb, BDRVSheepdogState *s,
|
|
QEMUIOVector *qiov, int64_t sector_num, int nb_sectors,
|
|
int type)
|
|
{
|
|
uint32_t object_size;
|
|
|
|
object_size = (UINT32_C(1) << s->inode.block_size_shift);
|
|
|
|
acb->s = s;
|
|
|
|
acb->qiov = qiov;
|
|
|
|
acb->sector_num = sector_num;
|
|
acb->nb_sectors = nb_sectors;
|
|
|
|
acb->coroutine = qemu_coroutine_self();
|
|
acb->ret = 0;
|
|
acb->nr_pending = 0;
|
|
|
|
acb->min_affect_data_idx = acb->sector_num * BDRV_SECTOR_SIZE / object_size;
|
|
acb->max_affect_data_idx = (acb->sector_num * BDRV_SECTOR_SIZE +
|
|
acb->nb_sectors * BDRV_SECTOR_SIZE) / object_size;
|
|
|
|
acb->min_dirty_data_idx = UINT32_MAX;
|
|
acb->max_dirty_data_idx = 0;
|
|
acb->aiocb_type = type;
|
|
|
|
if (type == AIOCB_FLUSH_CACHE) {
|
|
return;
|
|
}
|
|
|
|
qemu_co_mutex_lock(&s->queue_lock);
|
|
wait_for_overlapping_aiocb(s, acb);
|
|
QLIST_INSERT_HEAD(&s->inflight_aiocb_head, acb, aiocb_siblings);
|
|
qemu_co_mutex_unlock(&s->queue_lock);
|
|
}
|
|
|
|
static SocketAddress *sd_socket_address(const char *path,
|
|
const char *host, const char *port)
|
|
{
|
|
SocketAddress *addr = g_new0(SocketAddress, 1);
|
|
|
|
if (path) {
|
|
addr->type = SOCKET_ADDRESS_TYPE_UNIX;
|
|
addr->u.q_unix.path = g_strdup(path);
|
|
} else {
|
|
addr->type = SOCKET_ADDRESS_TYPE_INET;
|
|
addr->u.inet.host = g_strdup(host ?: SD_DEFAULT_ADDR);
|
|
addr->u.inet.port = g_strdup(port ?: stringify(SD_DEFAULT_PORT));
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
|
|
static SocketAddress *sd_server_config(QDict *options, Error **errp)
|
|
{
|
|
QDict *server = NULL;
|
|
QObject *crumpled_server = NULL;
|
|
Visitor *iv = NULL;
|
|
SocketAddress *saddr = NULL;
|
|
Error *local_err = NULL;
|
|
|
|
qdict_extract_subqdict(options, &server, "server.");
|
|
|
|
crumpled_server = qdict_crumple(server, errp);
|
|
if (!crumpled_server) {
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* FIXME .numeric, .to, .ipv4 or .ipv6 don't work with -drive
|
|
* server.type=inet. .to doesn't matter, it's ignored anyway.
|
|
* That's because when @options come from -blockdev or
|
|
* blockdev_add, members are typed according to the QAPI schema,
|
|
* but when they come from -drive, they're all QString. The
|
|
* visitor expects the former.
|
|
*/
|
|
iv = qobject_input_visitor_new(crumpled_server);
|
|
visit_type_SocketAddress(iv, NULL, &saddr, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
visit_free(iv);
|
|
qobject_decref(crumpled_server);
|
|
QDECREF(server);
|
|
return saddr;
|
|
}
|
|
|
|
/* Return -EIO in case of error, file descriptor on success */
|
|
static int connect_to_sdog(BDRVSheepdogState *s, Error **errp)
|
|
{
|
|
int fd;
|
|
|
|
fd = socket_connect(s->addr, NULL, NULL, errp);
|
|
|
|
if (s->addr->type == SOCKET_ADDRESS_TYPE_INET && fd >= 0) {
|
|
int ret = socket_set_nodelay(fd);
|
|
if (ret < 0) {
|
|
error_report("%s", strerror(errno));
|
|
}
|
|
}
|
|
|
|
if (fd >= 0) {
|
|
qemu_set_nonblock(fd);
|
|
} else {
|
|
fd = -EIO;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
/* Return 0 on success and -errno in case of error */
|
|
static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data,
|
|
unsigned int *wlen)
|
|
{
|
|
int ret;
|
|
|
|
ret = qemu_co_send(sockfd, hdr, sizeof(*hdr));
|
|
if (ret != sizeof(*hdr)) {
|
|
error_report("failed to send a req, %s", strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
ret = qemu_co_send(sockfd, data, *wlen);
|
|
if (ret != *wlen) {
|
|
error_report("failed to send a req, %s", strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
typedef struct SheepdogReqCo {
|
|
int sockfd;
|
|
BlockDriverState *bs;
|
|
AioContext *aio_context;
|
|
SheepdogReq *hdr;
|
|
void *data;
|
|
unsigned int *wlen;
|
|
unsigned int *rlen;
|
|
int ret;
|
|
bool finished;
|
|
Coroutine *co;
|
|
} SheepdogReqCo;
|
|
|
|
static void restart_co_req(void *opaque)
|
|
{
|
|
SheepdogReqCo *srco = opaque;
|
|
|
|
aio_co_wake(srco->co);
|
|
}
|
|
|
|
static coroutine_fn void do_co_req(void *opaque)
|
|
{
|
|
int ret;
|
|
SheepdogReqCo *srco = opaque;
|
|
int sockfd = srco->sockfd;
|
|
SheepdogReq *hdr = srco->hdr;
|
|
void *data = srco->data;
|
|
unsigned int *wlen = srco->wlen;
|
|
unsigned int *rlen = srco->rlen;
|
|
|
|
srco->co = qemu_coroutine_self();
|
|
aio_set_fd_handler(srco->aio_context, sockfd, false,
|
|
NULL, restart_co_req, NULL, srco);
|
|
|
|
ret = send_co_req(sockfd, hdr, data, wlen);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
aio_set_fd_handler(srco->aio_context, sockfd, false,
|
|
restart_co_req, NULL, NULL, srco);
|
|
|
|
ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr));
|
|
if (ret != sizeof(*hdr)) {
|
|
error_report("failed to get a rsp, %s", strerror(errno));
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
|
|
if (*rlen > hdr->data_length) {
|
|
*rlen = hdr->data_length;
|
|
}
|
|
|
|
if (*rlen) {
|
|
ret = qemu_co_recv(sockfd, data, *rlen);
|
|
if (ret != *rlen) {
|
|
error_report("failed to get the data, %s", strerror(errno));
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
/* there is at most one request for this sockfd, so it is safe to
|
|
* set each handler to NULL. */
|
|
aio_set_fd_handler(srco->aio_context, sockfd, false,
|
|
NULL, NULL, NULL, NULL);
|
|
|
|
srco->co = NULL;
|
|
srco->ret = ret;
|
|
/* Set srco->finished before reading bs->wakeup. */
|
|
atomic_mb_set(&srco->finished, true);
|
|
if (srco->bs) {
|
|
bdrv_wakeup(srco->bs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send the request to the sheep in a synchronous manner.
|
|
*
|
|
* Return 0 on success, -errno in case of error.
|
|
*/
|
|
static int do_req(int sockfd, BlockDriverState *bs, SheepdogReq *hdr,
|
|
void *data, unsigned int *wlen, unsigned int *rlen)
|
|
{
|
|
Coroutine *co;
|
|
SheepdogReqCo srco = {
|
|
.sockfd = sockfd,
|
|
.aio_context = bs ? bdrv_get_aio_context(bs) : qemu_get_aio_context(),
|
|
.bs = bs,
|
|
.hdr = hdr,
|
|
.data = data,
|
|
.wlen = wlen,
|
|
.rlen = rlen,
|
|
.ret = 0,
|
|
.finished = false,
|
|
};
|
|
|
|
if (qemu_in_coroutine()) {
|
|
do_co_req(&srco);
|
|
} else {
|
|
co = qemu_coroutine_create(do_co_req, &srco);
|
|
if (bs) {
|
|
bdrv_coroutine_enter(bs, co);
|
|
BDRV_POLL_WHILE(bs, !srco.finished);
|
|
} else {
|
|
qemu_coroutine_enter(co);
|
|
while (!srco.finished) {
|
|
aio_poll(qemu_get_aio_context(), true);
|
|
}
|
|
}
|
|
}
|
|
|
|
return srco.ret;
|
|
}
|
|
|
|
static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
|
|
struct iovec *iov, int niov,
|
|
enum AIOCBState aiocb_type);
|
|
static void coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req);
|
|
static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag);
|
|
static int get_sheep_fd(BDRVSheepdogState *s, Error **errp);
|
|
static void co_write_request(void *opaque);
|
|
|
|
static coroutine_fn void reconnect_to_sdog(void *opaque)
|
|
{
|
|
BDRVSheepdogState *s = opaque;
|
|
AIOReq *aio_req, *next;
|
|
|
|
aio_set_fd_handler(s->aio_context, s->fd, false, NULL,
|
|
NULL, NULL, NULL);
|
|
close(s->fd);
|
|
s->fd = -1;
|
|
|
|
/* Wait for outstanding write requests to be completed. */
|
|
while (s->co_send != NULL) {
|
|
co_write_request(opaque);
|
|
}
|
|
|
|
/* Try to reconnect the sheepdog server every one second. */
|
|
while (s->fd < 0) {
|
|
Error *local_err = NULL;
|
|
s->fd = get_sheep_fd(s, &local_err);
|
|
if (s->fd < 0) {
|
|
DPRINTF("Wait for connection to be established\n");
|
|
error_report_err(local_err);
|
|
co_aio_sleep_ns(bdrv_get_aio_context(s->bs), QEMU_CLOCK_REALTIME,
|
|
1000000000ULL);
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Now we have to resend all the request in the inflight queue. However,
|
|
* resend_aioreq() can yield and newly created requests can be added to the
|
|
* inflight queue before the coroutine is resumed. To avoid mixing them, we
|
|
* have to move all the inflight requests to the failed queue before
|
|
* resend_aioreq() is called.
|
|
*/
|
|
qemu_co_mutex_lock(&s->queue_lock);
|
|
QLIST_FOREACH_SAFE(aio_req, &s->inflight_aio_head, aio_siblings, next) {
|
|
QLIST_REMOVE(aio_req, aio_siblings);
|
|
QLIST_INSERT_HEAD(&s->failed_aio_head, aio_req, aio_siblings);
|
|
}
|
|
|
|
/* Resend all the failed aio requests. */
|
|
while (!QLIST_EMPTY(&s->failed_aio_head)) {
|
|
aio_req = QLIST_FIRST(&s->failed_aio_head);
|
|
QLIST_REMOVE(aio_req, aio_siblings);
|
|
qemu_co_mutex_unlock(&s->queue_lock);
|
|
resend_aioreq(s, aio_req);
|
|
qemu_co_mutex_lock(&s->queue_lock);
|
|
}
|
|
qemu_co_mutex_unlock(&s->queue_lock);
|
|
}
|
|
|
|
/*
|
|
* 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 coroutine_fn aio_read_response(void *opaque)
|
|
{
|
|
SheepdogObjRsp rsp;
|
|
BDRVSheepdogState *s = opaque;
|
|
int fd = s->fd;
|
|
int ret;
|
|
AIOReq *aio_req = NULL;
|
|
SheepdogAIOCB *acb;
|
|
uint64_t idx;
|
|
|
|
/* read a header */
|
|
ret = qemu_co_recv(fd, &rsp, sizeof(rsp));
|
|
if (ret != sizeof(rsp)) {
|
|
error_report("failed to get the header, %s", strerror(errno));
|
|
goto err;
|
|
}
|
|
|
|
/* find the right aio_req from the inflight aio list */
|
|
QLIST_FOREACH(aio_req, &s->inflight_aio_head, aio_siblings) {
|
|
if (aio_req->id == rsp.id) {
|
|
break;
|
|
}
|
|
}
|
|
if (!aio_req) {
|
|
error_report("cannot find aio_req %x", rsp.id);
|
|
goto err;
|
|
}
|
|
|
|
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 (aio_req->create) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (rsp.result == SD_RES_SUCCESS) {
|
|
s->inode.data_vdi_id[idx] = s->inode.vdi_id;
|
|
acb->max_dirty_data_idx = MAX(idx, acb->max_dirty_data_idx);
|
|
acb->min_dirty_data_idx = MIN(idx, acb->min_dirty_data_idx);
|
|
}
|
|
}
|
|
break;
|
|
case AIOCB_READ_UDATA:
|
|
ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov,
|
|
aio_req->iov_offset, rsp.data_length);
|
|
if (ret != rsp.data_length) {
|
|
error_report("failed to get the data, %s", strerror(errno));
|
|
goto err;
|
|
}
|
|
break;
|
|
case AIOCB_FLUSH_CACHE:
|
|
if (rsp.result == SD_RES_INVALID_PARMS) {
|
|
DPRINTF("disable cache since the server doesn't support it\n");
|
|
s->cache_flags = SD_FLAG_CMD_DIRECT;
|
|
rsp.result = SD_RES_SUCCESS;
|
|
}
|
|
break;
|
|
case AIOCB_DISCARD_OBJ:
|
|
switch (rsp.result) {
|
|
case SD_RES_INVALID_PARMS:
|
|
error_report("server doesn't support discard command");
|
|
rsp.result = SD_RES_SUCCESS;
|
|
s->discard_supported = false;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* No more data for this aio_req (reload_inode below uses its own file
|
|
* descriptor handler which doesn't use co_recv).
|
|
*/
|
|
s->co_recv = NULL;
|
|
|
|
qemu_co_mutex_lock(&s->queue_lock);
|
|
QLIST_REMOVE(aio_req, aio_siblings);
|
|
qemu_co_mutex_unlock(&s->queue_lock);
|
|
|
|
switch (rsp.result) {
|
|
case SD_RES_SUCCESS:
|
|
break;
|
|
case SD_RES_READONLY:
|
|
if (s->inode.vdi_id == oid_to_vid(aio_req->oid)) {
|
|
ret = reload_inode(s, 0, "");
|
|
if (ret < 0) {
|
|
goto err;
|
|
}
|
|
}
|
|
if (is_data_obj(aio_req->oid)) {
|
|
aio_req->oid = vid_to_data_oid(s->inode.vdi_id,
|
|
data_oid_to_idx(aio_req->oid));
|
|
} else {
|
|
aio_req->oid = vid_to_vdi_oid(s->inode.vdi_id);
|
|
}
|
|
resend_aioreq(s, aio_req);
|
|
return;
|
|
default:
|
|
acb->ret = -EIO;
|
|
error_report("%s", sd_strerror(rsp.result));
|
|
break;
|
|
}
|
|
|
|
g_free(aio_req);
|
|
|
|
if (!--acb->nr_pending) {
|
|
/*
|
|
* We've finished all requests which belong to the AIOCB, so
|
|
* we can switch back to sd_co_readv/writev now.
|
|
*/
|
|
aio_co_wake(acb->coroutine);
|
|
}
|
|
|
|
return;
|
|
|
|
err:
|
|
reconnect_to_sdog(opaque);
|
|
}
|
|
|
|
static void co_read_response(void *opaque)
|
|
{
|
|
BDRVSheepdogState *s = opaque;
|
|
|
|
if (!s->co_recv) {
|
|
s->co_recv = qemu_coroutine_create(aio_read_response, opaque);
|
|
}
|
|
|
|
aio_co_enter(s->aio_context, s->co_recv);
|
|
}
|
|
|
|
static void co_write_request(void *opaque)
|
|
{
|
|
BDRVSheepdogState *s = opaque;
|
|
|
|
aio_co_wake(s->co_send);
|
|
}
|
|
|
|
/*
|
|
* Return a socket descriptor to read/write objects.
|
|
*
|
|
* We cannot use this descriptor for other operations because
|
|
* the block driver may be on waiting response from the server.
|
|
*/
|
|
static int get_sheep_fd(BDRVSheepdogState *s, Error **errp)
|
|
{
|
|
int fd;
|
|
|
|
fd = connect_to_sdog(s, errp);
|
|
if (fd < 0) {
|
|
return fd;
|
|
}
|
|
|
|
aio_set_fd_handler(s->aio_context, fd, false,
|
|
co_read_response, NULL, NULL, s);
|
|
return fd;
|
|
}
|
|
|
|
/*
|
|
* Parse numeric snapshot ID in @str
|
|
* If @str can't be parsed as number, return false.
|
|
* Else, if the number is zero or too large, set *@snapid to zero and
|
|
* return true.
|
|
* Else, set *@snapid to the number and return true.
|
|
*/
|
|
static bool sd_parse_snapid(const char *str, uint32_t *snapid)
|
|
{
|
|
unsigned long ul;
|
|
int ret;
|
|
|
|
ret = qemu_strtoul(str, NULL, 10, &ul);
|
|
if (ret == -ERANGE) {
|
|
ul = ret = 0;
|
|
}
|
|
if (ret) {
|
|
return false;
|
|
}
|
|
if (ul > UINT32_MAX) {
|
|
ul = 0;
|
|
}
|
|
|
|
*snapid = ul;
|
|
return true;
|
|
}
|
|
|
|
static bool sd_parse_snapid_or_tag(const char *str,
|
|
uint32_t *snapid, char tag[])
|
|
{
|
|
if (!sd_parse_snapid(str, snapid)) {
|
|
*snapid = 0;
|
|
if (g_strlcpy(tag, str, SD_MAX_VDI_TAG_LEN) >= SD_MAX_VDI_TAG_LEN) {
|
|
return false;
|
|
}
|
|
} else if (!*snapid) {
|
|
return false;
|
|
} else {
|
|
tag[0] = 0;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
typedef struct {
|
|
const char *path; /* non-null iff transport is tcp */
|
|
const char *host; /* valid when transport is tcp */
|
|
int port; /* valid when transport is tcp */
|
|
char vdi[SD_MAX_VDI_LEN];
|
|
char tag[SD_MAX_VDI_TAG_LEN];
|
|
uint32_t snap_id;
|
|
/* Remainder is only for sd_config_done() */
|
|
URI *uri;
|
|
QueryParams *qp;
|
|
} SheepdogConfig;
|
|
|
|
static void sd_config_done(SheepdogConfig *cfg)
|
|
{
|
|
if (cfg->qp) {
|
|
query_params_free(cfg->qp);
|
|
}
|
|
uri_free(cfg->uri);
|
|
}
|
|
|
|
static void sd_parse_uri(SheepdogConfig *cfg, const char *filename,
|
|
Error **errp)
|
|
{
|
|
Error *err = NULL;
|
|
QueryParams *qp = NULL;
|
|
bool is_unix;
|
|
URI *uri;
|
|
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
cfg->uri = uri = uri_parse(filename);
|
|
if (!uri) {
|
|
error_setg(&err, "invalid URI");
|
|
goto out;
|
|
}
|
|
|
|
/* transport */
|
|
if (!g_strcmp0(uri->scheme, "sheepdog")) {
|
|
is_unix = false;
|
|
} else if (!g_strcmp0(uri->scheme, "sheepdog+tcp")) {
|
|
is_unix = false;
|
|
} else if (!g_strcmp0(uri->scheme, "sheepdog+unix")) {
|
|
is_unix = true;
|
|
} else {
|
|
error_setg(&err, "URI scheme must be 'sheepdog', 'sheepdog+tcp',"
|
|
" or 'sheepdog+unix'");
|
|
goto out;
|
|
}
|
|
|
|
if (uri->path == NULL || !strcmp(uri->path, "/")) {
|
|
error_setg(&err, "missing file path in URI");
|
|
goto out;
|
|
}
|
|
if (g_strlcpy(cfg->vdi, uri->path + 1, SD_MAX_VDI_LEN)
|
|
>= SD_MAX_VDI_LEN) {
|
|
error_setg(&err, "VDI name is too long");
|
|
goto out;
|
|
}
|
|
|
|
cfg->qp = qp = query_params_parse(uri->query);
|
|
|
|
if (is_unix) {
|
|
/* sheepdog+unix:///vdiname?socket=path */
|
|
if (uri->server || uri->port) {
|
|
error_setg(&err, "URI scheme %s doesn't accept a server address",
|
|
uri->scheme);
|
|
goto out;
|
|
}
|
|
if (!qp->n) {
|
|
error_setg(&err,
|
|
"URI scheme %s requires query parameter 'socket'",
|
|
uri->scheme);
|
|
goto out;
|
|
}
|
|
if (qp->n != 1 || strcmp(qp->p[0].name, "socket")) {
|
|
error_setg(&err, "unexpected query parameters");
|
|
goto out;
|
|
}
|
|
cfg->path = qp->p[0].value;
|
|
} else {
|
|
/* sheepdog[+tcp]://[host:port]/vdiname */
|
|
if (qp->n) {
|
|
error_setg(&err, "unexpected query parameters");
|
|
goto out;
|
|
}
|
|
cfg->host = uri->server;
|
|
cfg->port = uri->port;
|
|
}
|
|
|
|
/* snapshot tag */
|
|
if (uri->fragment) {
|
|
if (!sd_parse_snapid_or_tag(uri->fragment,
|
|
&cfg->snap_id, cfg->tag)) {
|
|
error_setg(&err, "'%s' is not a valid snapshot ID",
|
|
uri->fragment);
|
|
goto out;
|
|
}
|
|
} else {
|
|
cfg->snap_id = CURRENT_VDI_ID; /* search current vdi */
|
|
}
|
|
|
|
out:
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
sd_config_done(cfg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Parse a filename (old syntax)
|
|
*
|
|
* 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 void parse_vdiname(SheepdogConfig *cfg, const char *filename,
|
|
Error **errp)
|
|
{
|
|
Error *err = NULL;
|
|
char *p, *q, *uri;
|
|
const char *host_spec, *vdi_spec;
|
|
int nr_sep;
|
|
|
|
strstart(filename, "sheepdog:", &filename);
|
|
p = q = g_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 host_spec. */
|
|
if (nr_sep >= 2) {
|
|
host_spec = p;
|
|
p = strchr(p, ':');
|
|
p++;
|
|
p = strchr(p, ':');
|
|
*p++ = '\0';
|
|
} else {
|
|
host_spec = "";
|
|
}
|
|
|
|
vdi_spec = p;
|
|
|
|
p = strchr(vdi_spec, ':');
|
|
if (p) {
|
|
*p++ = '#';
|
|
}
|
|
|
|
uri = g_strdup_printf("sheepdog://%s/%s", host_spec, vdi_spec);
|
|
|
|
/*
|
|
* FIXME We to escape URI meta-characters, e.g. "x?y=z"
|
|
* produces "sheepdog://x?y=z". Because of that ...
|
|
*/
|
|
sd_parse_uri(cfg, uri, &err);
|
|
if (err) {
|
|
/*
|
|
* ... this can fail, but the error message is misleading.
|
|
* Replace it by the traditional useless one until the
|
|
* escaping is fixed.
|
|
*/
|
|
error_free(err);
|
|
error_setg(errp, "Can't parse filename");
|
|
}
|
|
|
|
g_free(q);
|
|
g_free(uri);
|
|
}
|
|
|
|
static void sd_parse_filename(const char *filename, QDict *options,
|
|
Error **errp)
|
|
{
|
|
Error *err = NULL;
|
|
SheepdogConfig cfg;
|
|
char buf[32];
|
|
|
|
if (strstr(filename, "://")) {
|
|
sd_parse_uri(&cfg, filename, &err);
|
|
} else {
|
|
parse_vdiname(&cfg, filename, &err);
|
|
}
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
if (cfg.path) {
|
|
qdict_set_default_str(options, "server.path", cfg.path);
|
|
qdict_set_default_str(options, "server.type", "unix");
|
|
} else {
|
|
qdict_set_default_str(options, "server.type", "inet");
|
|
qdict_set_default_str(options, "server.host",
|
|
cfg.host ?: SD_DEFAULT_ADDR);
|
|
snprintf(buf, sizeof(buf), "%d", cfg.port ?: SD_DEFAULT_PORT);
|
|
qdict_set_default_str(options, "server.port", buf);
|
|
}
|
|
qdict_set_default_str(options, "vdi", cfg.vdi);
|
|
qdict_set_default_str(options, "tag", cfg.tag);
|
|
if (cfg.snap_id) {
|
|
snprintf(buf, sizeof(buf), "%d", cfg.snap_id);
|
|
qdict_set_default_str(options, "snap-id", buf);
|
|
}
|
|
|
|
sd_config_done(&cfg);
|
|
}
|
|
|
|
static int find_vdi_name(BDRVSheepdogState *s, const char *filename,
|
|
uint32_t snapid, const char *tag, uint32_t *vid,
|
|
bool lock, Error **errp)
|
|
{
|
|
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, errp);
|
|
if (fd < 0) {
|
|
return fd;
|
|
}
|
|
|
|
/* This pair of strncpy calls ensures that the buffer is zero-filled,
|
|
* which is desirable since we'll soon be sending those bytes, and
|
|
* don't want the send_req to read uninitialized data.
|
|
*/
|
|
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 (lock) {
|
|
hdr.opcode = SD_OP_LOCK_VDI;
|
|
hdr.type = LOCK_TYPE_NORMAL;
|
|
} else {
|
|
hdr.opcode = SD_OP_GET_VDI_INFO;
|
|
}
|
|
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, s->bs, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret, "cannot get vdi info");
|
|
goto out;
|
|
}
|
|
|
|
if (rsp->result != SD_RES_SUCCESS) {
|
|
error_setg(errp, "cannot get vdi info, %s, %s %" PRIu32 " %s",
|
|
sd_strerror(rsp->result), filename, snapid, tag);
|
|
if (rsp->result == SD_RES_NO_VDI) {
|
|
ret = -ENOENT;
|
|
} else if (rsp->result == SD_RES_VDI_LOCKED) {
|
|
ret = -EBUSY;
|
|
} else {
|
|
ret = -EIO;
|
|
}
|
|
goto out;
|
|
}
|
|
*vid = rsp->vdi_id;
|
|
|
|
ret = 0;
|
|
out:
|
|
closesocket(fd);
|
|
return ret;
|
|
}
|
|
|
|
static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
|
|
struct iovec *iov, int niov,
|
|
enum AIOCBState aiocb_type)
|
|
{
|
|
int nr_copies = s->inode.nr_copies;
|
|
SheepdogObjReq hdr;
|
|
unsigned int wlen = 0;
|
|
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;
|
|
bool create = aio_req->create;
|
|
|
|
qemu_co_mutex_lock(&s->queue_lock);
|
|
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings);
|
|
qemu_co_mutex_unlock(&s->queue_lock);
|
|
|
|
if (!nr_copies) {
|
|
error_report("bug");
|
|
}
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
|
|
switch (aiocb_type) {
|
|
case AIOCB_FLUSH_CACHE:
|
|
hdr.opcode = SD_OP_FLUSH_VDI;
|
|
break;
|
|
case AIOCB_READ_UDATA:
|
|
hdr.opcode = SD_OP_READ_OBJ;
|
|
hdr.flags = flags;
|
|
break;
|
|
case AIOCB_WRITE_UDATA:
|
|
if (create) {
|
|
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ;
|
|
} else {
|
|
hdr.opcode = SD_OP_WRITE_OBJ;
|
|
}
|
|
wlen = datalen;
|
|
hdr.flags = SD_FLAG_CMD_WRITE | flags;
|
|
break;
|
|
case AIOCB_DISCARD_OBJ:
|
|
hdr.opcode = SD_OP_WRITE_OBJ;
|
|
hdr.flags = SD_FLAG_CMD_WRITE | flags;
|
|
s->inode.data_vdi_id[data_oid_to_idx(oid)] = 0;
|
|
offset = offsetof(SheepdogInode,
|
|
data_vdi_id[data_oid_to_idx(oid)]);
|
|
oid = vid_to_vdi_oid(s->inode.vdi_id);
|
|
wlen = datalen = sizeof(uint32_t);
|
|
break;
|
|
}
|
|
|
|
if (s->cache_flags) {
|
|
hdr.flags |= s->cache_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;
|
|
|
|
qemu_co_mutex_lock(&s->lock);
|
|
s->co_send = qemu_coroutine_self();
|
|
aio_set_fd_handler(s->aio_context, s->fd, false,
|
|
co_read_response, co_write_request, NULL, s);
|
|
socket_set_cork(s->fd, 1);
|
|
|
|
/* send a header */
|
|
ret = qemu_co_send(s->fd, &hdr, sizeof(hdr));
|
|
if (ret != sizeof(hdr)) {
|
|
error_report("failed to send a req, %s", strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
if (wlen) {
|
|
ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen);
|
|
if (ret != wlen) {
|
|
error_report("failed to send a data, %s", strerror(errno));
|
|
}
|
|
}
|
|
out:
|
|
socket_set_cork(s->fd, 0);
|
|
aio_set_fd_handler(s->aio_context, s->fd, false,
|
|
co_read_response, NULL, NULL, s);
|
|
s->co_send = NULL;
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
}
|
|
|
|
static int read_write_object(int fd, BlockDriverState *bs, char *buf,
|
|
uint64_t oid, uint8_t copies,
|
|
unsigned int datalen, uint64_t offset,
|
|
bool write, bool create, uint32_t cache_flags)
|
|
{
|
|
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.flags |= cache_flags;
|
|
|
|
hdr.oid = oid;
|
|
hdr.data_length = datalen;
|
|
hdr.offset = offset;
|
|
hdr.copies = copies;
|
|
|
|
ret = do_req(fd, bs, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
if (ret) {
|
|
error_report("failed to send a request to the sheep");
|
|
return ret;
|
|
}
|
|
|
|
switch (rsp->result) {
|
|
case SD_RES_SUCCESS:
|
|
return 0;
|
|
default:
|
|
error_report("%s", sd_strerror(rsp->result));
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
static int read_object(int fd, BlockDriverState *bs, char *buf,
|
|
uint64_t oid, uint8_t copies,
|
|
unsigned int datalen, uint64_t offset,
|
|
uint32_t cache_flags)
|
|
{
|
|
return read_write_object(fd, bs, buf, oid, copies,
|
|
datalen, offset, false,
|
|
false, cache_flags);
|
|
}
|
|
|
|
static int write_object(int fd, BlockDriverState *bs, char *buf,
|
|
uint64_t oid, uint8_t copies,
|
|
unsigned int datalen, uint64_t offset, bool create,
|
|
uint32_t cache_flags)
|
|
{
|
|
return read_write_object(fd, bs, buf, oid, copies,
|
|
datalen, offset, true,
|
|
create, cache_flags);
|
|
}
|
|
|
|
/* update inode with the latest state */
|
|
static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag)
|
|
{
|
|
Error *local_err = NULL;
|
|
SheepdogInode *inode;
|
|
int ret = 0, fd;
|
|
uint32_t vid = 0;
|
|
|
|
fd = connect_to_sdog(s, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
return -EIO;
|
|
}
|
|
|
|
inode = g_malloc(SD_INODE_HEADER_SIZE);
|
|
|
|
ret = find_vdi_name(s, s->name, snapid, tag, &vid, false, &local_err);
|
|
if (ret) {
|
|
error_report_err(local_err);
|
|
goto out;
|
|
}
|
|
|
|
ret = read_object(fd, s->bs, (char *)inode, vid_to_vdi_oid(vid),
|
|
s->inode.nr_copies, SD_INODE_HEADER_SIZE, 0,
|
|
s->cache_flags);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
if (inode->vdi_id != s->inode.vdi_id) {
|
|
memcpy(&s->inode, inode, SD_INODE_HEADER_SIZE);
|
|
}
|
|
|
|
out:
|
|
g_free(inode);
|
|
closesocket(fd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req)
|
|
{
|
|
SheepdogAIOCB *acb = aio_req->aiocb;
|
|
|
|
aio_req->create = false;
|
|
|
|
/* check whether this request becomes a CoW one */
|
|
if (acb->aiocb_type == AIOCB_WRITE_UDATA && is_data_obj(aio_req->oid)) {
|
|
int idx = data_oid_to_idx(aio_req->oid);
|
|
|
|
if (is_data_obj_writable(&s->inode, idx)) {
|
|
goto out;
|
|
}
|
|
|
|
if (s->inode.data_vdi_id[idx]) {
|
|
aio_req->base_oid = vid_to_data_oid(s->inode.data_vdi_id[idx], idx);
|
|
aio_req->flags |= SD_FLAG_CMD_COW;
|
|
}
|
|
aio_req->create = true;
|
|
}
|
|
out:
|
|
if (is_data_obj(aio_req->oid)) {
|
|
add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
|
|
acb->aiocb_type);
|
|
} else {
|
|
struct iovec iov;
|
|
iov.iov_base = &s->inode;
|
|
iov.iov_len = sizeof(s->inode);
|
|
add_aio_request(s, aio_req, &iov, 1, AIOCB_WRITE_UDATA);
|
|
}
|
|
}
|
|
|
|
static void sd_detach_aio_context(BlockDriverState *bs)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
|
|
aio_set_fd_handler(s->aio_context, s->fd, false, NULL,
|
|
NULL, NULL, NULL);
|
|
}
|
|
|
|
static void sd_attach_aio_context(BlockDriverState *bs,
|
|
AioContext *new_context)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
|
|
s->aio_context = new_context;
|
|
aio_set_fd_handler(new_context, s->fd, false,
|
|
co_read_response, NULL, NULL, s);
|
|
}
|
|
|
|
static QemuOptsList runtime_opts = {
|
|
.name = "sheepdog",
|
|
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "vdi",
|
|
.type = QEMU_OPT_STRING,
|
|
},
|
|
{
|
|
.name = "snap-id",
|
|
.type = QEMU_OPT_NUMBER,
|
|
},
|
|
{
|
|
.name = "tag",
|
|
.type = QEMU_OPT_STRING,
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
static int sd_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
int ret, fd;
|
|
uint32_t vid = 0;
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
const char *vdi, *snap_id_str, *tag;
|
|
uint64_t snap_id;
|
|
char *buf = NULL;
|
|
QemuOpts *opts;
|
|
Error *local_err = NULL;
|
|
|
|
s->bs = bs;
|
|
s->aio_context = bdrv_get_aio_context(bs);
|
|
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto err_no_fd;
|
|
}
|
|
|
|
s->addr = sd_server_config(options, errp);
|
|
if (!s->addr) {
|
|
ret = -EINVAL;
|
|
goto err_no_fd;
|
|
}
|
|
|
|
vdi = qemu_opt_get(opts, "vdi");
|
|
snap_id_str = qemu_opt_get(opts, "snap-id");
|
|
snap_id = qemu_opt_get_number(opts, "snap-id", CURRENT_VDI_ID);
|
|
tag = qemu_opt_get(opts, "tag");
|
|
|
|
if (!vdi) {
|
|
error_setg(errp, "parameter 'vdi' is missing");
|
|
ret = -EINVAL;
|
|
goto err_no_fd;
|
|
}
|
|
if (strlen(vdi) >= SD_MAX_VDI_LEN) {
|
|
error_setg(errp, "value of parameter 'vdi' is too long");
|
|
ret = -EINVAL;
|
|
goto err_no_fd;
|
|
}
|
|
|
|
if (snap_id > UINT32_MAX) {
|
|
snap_id = 0;
|
|
}
|
|
if (snap_id_str && !snap_id) {
|
|
error_setg(errp, "'snap-id=%s' is not a valid snapshot ID",
|
|
snap_id_str);
|
|
ret = -EINVAL;
|
|
goto err_no_fd;
|
|
}
|
|
|
|
if (!tag) {
|
|
tag = "";
|
|
}
|
|
if (tag && strlen(tag) >= SD_MAX_VDI_TAG_LEN) {
|
|
error_setg(errp, "value of parameter 'tag' is too long");
|
|
ret = -EINVAL;
|
|
goto err_no_fd;
|
|
}
|
|
|
|
QLIST_INIT(&s->inflight_aio_head);
|
|
QLIST_INIT(&s->failed_aio_head);
|
|
QLIST_INIT(&s->inflight_aiocb_head);
|
|
|
|
s->fd = get_sheep_fd(s, errp);
|
|
if (s->fd < 0) {
|
|
ret = s->fd;
|
|
goto err_no_fd;
|
|
}
|
|
|
|
ret = find_vdi_name(s, vdi, (uint32_t)snap_id, tag, &vid, true, errp);
|
|
if (ret) {
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* QEMU block layer emulates writethrough cache as 'writeback + flush', so
|
|
* we always set SD_FLAG_CMD_CACHE (writeback cache) as default.
|
|
*/
|
|
s->cache_flags = SD_FLAG_CMD_CACHE;
|
|
if (flags & BDRV_O_NOCACHE) {
|
|
s->cache_flags = SD_FLAG_CMD_DIRECT;
|
|
}
|
|
s->discard_supported = true;
|
|
|
|
if (snap_id || tag[0]) {
|
|
DPRINTF("%" PRIx32 " snapshot inode was open.\n", vid);
|
|
s->is_snapshot = true;
|
|
}
|
|
|
|
fd = connect_to_sdog(s, errp);
|
|
if (fd < 0) {
|
|
ret = fd;
|
|
goto err;
|
|
}
|
|
|
|
buf = g_malloc(SD_INODE_SIZE);
|
|
ret = read_object(fd, s->bs, buf, vid_to_vdi_oid(vid),
|
|
0, SD_INODE_SIZE, 0, s->cache_flags);
|
|
|
|
closesocket(fd);
|
|
|
|
if (ret) {
|
|
error_setg(errp, "Can't read snapshot inode");
|
|
goto err;
|
|
}
|
|
|
|
memcpy(&s->inode, buf, sizeof(s->inode));
|
|
|
|
bs->total_sectors = s->inode.vdi_size / BDRV_SECTOR_SIZE;
|
|
pstrcpy(s->name, sizeof(s->name), vdi);
|
|
qemu_co_mutex_init(&s->lock);
|
|
qemu_co_mutex_init(&s->queue_lock);
|
|
qemu_co_queue_init(&s->overlapping_queue);
|
|
qemu_opts_del(opts);
|
|
g_free(buf);
|
|
return 0;
|
|
|
|
err:
|
|
aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd,
|
|
false, NULL, NULL, NULL, NULL);
|
|
closesocket(s->fd);
|
|
err_no_fd:
|
|
qemu_opts_del(opts);
|
|
g_free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int sd_reopen_prepare(BDRVReopenState *state, BlockReopenQueue *queue,
|
|
Error **errp)
|
|
{
|
|
BDRVSheepdogState *s = state->bs->opaque;
|
|
BDRVSheepdogReopenState *re_s;
|
|
int ret = 0;
|
|
|
|
re_s = state->opaque = g_new0(BDRVSheepdogReopenState, 1);
|
|
|
|
re_s->cache_flags = SD_FLAG_CMD_CACHE;
|
|
if (state->flags & BDRV_O_NOCACHE) {
|
|
re_s->cache_flags = SD_FLAG_CMD_DIRECT;
|
|
}
|
|
|
|
re_s->fd = get_sheep_fd(s, errp);
|
|
if (re_s->fd < 0) {
|
|
ret = re_s->fd;
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sd_reopen_commit(BDRVReopenState *state)
|
|
{
|
|
BDRVSheepdogReopenState *re_s = state->opaque;
|
|
BDRVSheepdogState *s = state->bs->opaque;
|
|
|
|
if (s->fd) {
|
|
aio_set_fd_handler(s->aio_context, s->fd, false,
|
|
NULL, NULL, NULL, NULL);
|
|
closesocket(s->fd);
|
|
}
|
|
|
|
s->fd = re_s->fd;
|
|
s->cache_flags = re_s->cache_flags;
|
|
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
|
|
return;
|
|
}
|
|
|
|
static void sd_reopen_abort(BDRVReopenState *state)
|
|
{
|
|
BDRVSheepdogReopenState *re_s = state->opaque;
|
|
BDRVSheepdogState *s = state->bs->opaque;
|
|
|
|
if (re_s == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (re_s->fd) {
|
|
aio_set_fd_handler(s->aio_context, re_s->fd, false,
|
|
NULL, NULL, NULL, NULL);
|
|
closesocket(re_s->fd);
|
|
}
|
|
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
|
|
return;
|
|
}
|
|
|
|
static int do_sd_create(BDRVSheepdogState *s, uint32_t *vdi_id, int snapshot,
|
|
Error **errp)
|
|
{
|
|
SheepdogVdiReq hdr;
|
|
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
int fd, ret;
|
|
unsigned int wlen, rlen = 0;
|
|
char buf[SD_MAX_VDI_LEN];
|
|
|
|
fd = connect_to_sdog(s, errp);
|
|
if (fd < 0) {
|
|
return fd;
|
|
}
|
|
|
|
/* FIXME: would it be better to fail (e.g., return -EIO) when filename
|
|
* does not fit in buf? For now, just truncate and avoid buffer overrun.
|
|
*/
|
|
memset(buf, 0, sizeof(buf));
|
|
pstrcpy(buf, sizeof(buf), s->name);
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
hdr.opcode = SD_OP_NEW_VDI;
|
|
hdr.base_vdi_id = s->inode.vdi_id;
|
|
|
|
wlen = SD_MAX_VDI_LEN;
|
|
|
|
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
hdr.snapid = snapshot;
|
|
|
|
hdr.data_length = wlen;
|
|
hdr.vdi_size = s->inode.vdi_size;
|
|
hdr.copy_policy = s->inode.copy_policy;
|
|
hdr.copies = s->inode.nr_copies;
|
|
hdr.block_size_shift = s->inode.block_size_shift;
|
|
|
|
ret = do_req(fd, NULL, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
|
|
|
|
closesocket(fd);
|
|
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret, "create failed");
|
|
return ret;
|
|
}
|
|
|
|
if (rsp->result != SD_RES_SUCCESS) {
|
|
error_setg(errp, "%s, %s", sd_strerror(rsp->result), s->inode.name);
|
|
return -EIO;
|
|
}
|
|
|
|
if (vdi_id) {
|
|
*vdi_id = rsp->vdi_id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sd_prealloc(const char *filename, Error **errp)
|
|
{
|
|
BlockBackend *blk = NULL;
|
|
BDRVSheepdogState *base = NULL;
|
|
unsigned long buf_size;
|
|
uint32_t idx, max_idx;
|
|
uint32_t object_size;
|
|
int64_t vdi_size;
|
|
void *buf = NULL;
|
|
int ret;
|
|
|
|
blk = blk_new_open(filename, NULL, NULL,
|
|
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
|
|
if (blk == NULL) {
|
|
ret = -EIO;
|
|
goto out_with_err_set;
|
|
}
|
|
|
|
blk_set_allow_write_beyond_eof(blk, true);
|
|
|
|
vdi_size = blk_getlength(blk);
|
|
if (vdi_size < 0) {
|
|
ret = vdi_size;
|
|
goto out;
|
|
}
|
|
|
|
base = blk_bs(blk)->opaque;
|
|
object_size = (UINT32_C(1) << base->inode.block_size_shift);
|
|
buf_size = MIN(object_size, SD_DATA_OBJ_SIZE);
|
|
buf = g_malloc0(buf_size);
|
|
|
|
max_idx = DIV_ROUND_UP(vdi_size, buf_size);
|
|
|
|
for (idx = 0; idx < max_idx; idx++) {
|
|
/*
|
|
* The created image can be a cloned image, so we need to read
|
|
* a data from the source image.
|
|
*/
|
|
ret = blk_pread(blk, idx * buf_size, buf, buf_size);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
ret = blk_pwrite(blk, idx * buf_size, buf, buf_size, 0);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "Can't pre-allocate");
|
|
}
|
|
out_with_err_set:
|
|
if (blk) {
|
|
blk_unref(blk);
|
|
}
|
|
g_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sheepdog support two kinds of redundancy, full replication and erasure
|
|
* coding.
|
|
*
|
|
* # create a fully replicated vdi with x copies
|
|
* -o redundancy=x (1 <= x <= SD_MAX_COPIES)
|
|
*
|
|
* # create a erasure coded vdi with x data strips and y parity strips
|
|
* -o redundancy=x:y (x must be one of {2,4,8,16} and 1 <= y < SD_EC_MAX_STRIP)
|
|
*/
|
|
static int parse_redundancy(BDRVSheepdogState *s, const char *opt)
|
|
{
|
|
struct SheepdogInode *inode = &s->inode;
|
|
const char *n1, *n2;
|
|
long copy, parity;
|
|
char p[10];
|
|
|
|
pstrcpy(p, sizeof(p), opt);
|
|
n1 = strtok(p, ":");
|
|
n2 = strtok(NULL, ":");
|
|
|
|
if (!n1) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
copy = strtol(n1, NULL, 10);
|
|
/* FIXME fix error checking by switching to qemu_strtol() */
|
|
if (copy > SD_MAX_COPIES || copy < 1) {
|
|
return -EINVAL;
|
|
}
|
|
if (!n2) {
|
|
inode->copy_policy = 0;
|
|
inode->nr_copies = copy;
|
|
return 0;
|
|
}
|
|
|
|
if (copy != 2 && copy != 4 && copy != 8 && copy != 16) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
parity = strtol(n2, NULL, 10);
|
|
/* FIXME fix error checking by switching to qemu_strtol() */
|
|
if (parity >= SD_EC_MAX_STRIP || parity < 1) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 4 bits for parity and 4 bits for data.
|
|
* We have to compress upper data bits because it can't represent 16
|
|
*/
|
|
inode->copy_policy = ((copy / 2) << 4) + parity;
|
|
inode->nr_copies = copy + parity;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_block_size_shift(BDRVSheepdogState *s, QemuOpts *opt)
|
|
{
|
|
struct SheepdogInode *inode = &s->inode;
|
|
uint64_t object_size;
|
|
int obj_order;
|
|
|
|
object_size = qemu_opt_get_size_del(opt, BLOCK_OPT_OBJECT_SIZE, 0);
|
|
if (object_size) {
|
|
if ((object_size - 1) & object_size) { /* not a power of 2? */
|
|
return -EINVAL;
|
|
}
|
|
obj_order = ctz32(object_size);
|
|
if (obj_order < 20 || obj_order > 31) {
|
|
return -EINVAL;
|
|
}
|
|
inode->block_size_shift = (uint8_t)obj_order;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sd_create(const char *filename, QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
Error *err = NULL;
|
|
int ret = 0;
|
|
uint32_t vid = 0;
|
|
char *backing_file = NULL;
|
|
char *buf = NULL;
|
|
BDRVSheepdogState *s;
|
|
SheepdogConfig cfg;
|
|
uint64_t max_vdi_size;
|
|
bool prealloc = false;
|
|
|
|
s = g_new0(BDRVSheepdogState, 1);
|
|
|
|
if (strstr(filename, "://")) {
|
|
sd_parse_uri(&cfg, filename, &err);
|
|
} else {
|
|
parse_vdiname(&cfg, filename, &err);
|
|
}
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
goto out;
|
|
}
|
|
|
|
buf = cfg.port ? g_strdup_printf("%d", cfg.port) : NULL;
|
|
s->addr = sd_socket_address(cfg.path, cfg.host, buf);
|
|
g_free(buf);
|
|
strcpy(s->name, cfg.vdi);
|
|
sd_config_done(&cfg);
|
|
|
|
s->inode.vdi_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
|
|
BDRV_SECTOR_SIZE);
|
|
backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
|
|
buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
|
|
if (!buf || !strcmp(buf, "off")) {
|
|
prealloc = false;
|
|
} else if (!strcmp(buf, "full")) {
|
|
prealloc = true;
|
|
} else {
|
|
error_setg(errp, "Invalid preallocation mode: '%s'", buf);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
g_free(buf);
|
|
buf = qemu_opt_get_del(opts, BLOCK_OPT_REDUNDANCY);
|
|
if (buf) {
|
|
ret = parse_redundancy(s, buf);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Invalid redundancy mode: '%s'", buf);
|
|
goto out;
|
|
}
|
|
}
|
|
ret = parse_block_size_shift(s, opts);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Invalid object_size."
|
|
" obect_size needs to be power of 2"
|
|
" and be limited from 2^20 to 2^31");
|
|
goto out;
|
|
}
|
|
|
|
if (backing_file) {
|
|
BlockBackend *blk;
|
|
BDRVSheepdogState *base;
|
|
BlockDriver *drv;
|
|
|
|
/* Currently, only Sheepdog backing image is supported. */
|
|
drv = bdrv_find_protocol(backing_file, true, NULL);
|
|
if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) {
|
|
error_setg(errp, "backing_file must be a sheepdog image");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
blk = blk_new_open(backing_file, NULL, NULL,
|
|
BDRV_O_PROTOCOL, errp);
|
|
if (blk == NULL) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
base = blk_bs(blk)->opaque;
|
|
|
|
if (!is_snapshot(&base->inode)) {
|
|
error_setg(errp, "cannot clone from a non snapshot vdi");
|
|
blk_unref(blk);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
s->inode.vdi_id = base->inode.vdi_id;
|
|
blk_unref(blk);
|
|
}
|
|
|
|
s->aio_context = qemu_get_aio_context();
|
|
|
|
/* if block_size_shift is not specified, get cluster default value */
|
|
if (s->inode.block_size_shift == 0) {
|
|
SheepdogVdiReq hdr;
|
|
SheepdogClusterRsp *rsp = (SheepdogClusterRsp *)&hdr;
|
|
int fd;
|
|
unsigned int wlen = 0, rlen = 0;
|
|
|
|
fd = connect_to_sdog(s, errp);
|
|
if (fd < 0) {
|
|
ret = fd;
|
|
goto out;
|
|
}
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
hdr.opcode = SD_OP_GET_CLUSTER_DEFAULT;
|
|
hdr.proto_ver = SD_PROTO_VER;
|
|
|
|
ret = do_req(fd, NULL, (SheepdogReq *)&hdr,
|
|
NULL, &wlen, &rlen);
|
|
closesocket(fd);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret, "failed to get cluster default");
|
|
goto out;
|
|
}
|
|
if (rsp->result == SD_RES_SUCCESS) {
|
|
s->inode.block_size_shift = rsp->block_size_shift;
|
|
} else {
|
|
s->inode.block_size_shift = SD_DEFAULT_BLOCK_SIZE_SHIFT;
|
|
}
|
|
}
|
|
|
|
max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS;
|
|
|
|
if (s->inode.vdi_size > max_vdi_size) {
|
|
error_setg(errp, "An image is too large."
|
|
" The maximum image size is %"PRIu64 "GB",
|
|
max_vdi_size / 1024 / 1024 / 1024);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = do_sd_create(s, &vid, 0, errp);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
if (prealloc) {
|
|
ret = sd_prealloc(filename, errp);
|
|
}
|
|
out:
|
|
g_free(backing_file);
|
|
g_free(buf);
|
|
g_free(s);
|
|
return ret;
|
|
}
|
|
|
|
static void sd_close(BlockDriverState *bs)
|
|
{
|
|
Error *local_err = NULL;
|
|
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, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
return;
|
|
}
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
|
|
hdr.opcode = SD_OP_RELEASE_VDI;
|
|
hdr.type = LOCK_TYPE_NORMAL;
|
|
hdr.base_vdi_id = s->inode.vdi_id;
|
|
wlen = strlen(s->name) + 1;
|
|
hdr.data_length = wlen;
|
|
hdr.flags = SD_FLAG_CMD_WRITE;
|
|
|
|
ret = do_req(fd, s->bs, (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", sd_strerror(rsp->result), s->name);
|
|
}
|
|
|
|
aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd,
|
|
false, NULL, NULL, NULL, NULL);
|
|
closesocket(s->fd);
|
|
qapi_free_SocketAddress(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,
|
|
PreallocMode prealloc, Error **errp)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
int ret, fd;
|
|
unsigned int datalen;
|
|
uint64_t max_vdi_size;
|
|
|
|
if (prealloc != PREALLOC_MODE_OFF) {
|
|
error_setg(errp, "Unsupported preallocation mode '%s'",
|
|
PreallocMode_lookup[prealloc]);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS;
|
|
if (offset < s->inode.vdi_size) {
|
|
error_setg(errp, "shrinking is not supported");
|
|
return -EINVAL;
|
|
} else if (offset > max_vdi_size) {
|
|
error_setg(errp, "too big image size");
|
|
return -EINVAL;
|
|
}
|
|
|
|
fd = connect_to_sdog(s, errp);
|
|
if (fd < 0) {
|
|
return fd;
|
|
}
|
|
|
|
/* 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, s->bs, (char *)&s->inode,
|
|
vid_to_vdi_oid(s->inode.vdi_id), s->inode.nr_copies,
|
|
datalen, 0, false, s->cache_flags);
|
|
close(fd);
|
|
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "failed to update an inode");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This function is called after writing data objects. If we need to
|
|
* update metadata, this sends a write request to the vdi object.
|
|
*/
|
|
static void coroutine_fn sd_write_done(SheepdogAIOCB *acb)
|
|
{
|
|
BDRVSheepdogState *s = acb->s;
|
|
struct iovec iov;
|
|
AIOReq *aio_req;
|
|
uint32_t offset, data_len, mn, mx;
|
|
|
|
mn = acb->min_dirty_data_idx;
|
|
mx = acb->max_dirty_data_idx;
|
|
if (mn <= mx) {
|
|
/* we need to update the vdi object. */
|
|
++acb->nr_pending;
|
|
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]);
|
|
|
|
acb->min_dirty_data_idx = UINT32_MAX;
|
|
acb->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, false, 0, offset);
|
|
add_aio_request(s, aio_req, &iov, 1, AIOCB_WRITE_UDATA);
|
|
if (--acb->nr_pending) {
|
|
qemu_coroutine_yield();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Delete current working VDI on the snapshot chain */
|
|
static bool sd_delete(BDRVSheepdogState *s)
|
|
{
|
|
Error *local_err = NULL;
|
|
unsigned int wlen = SD_MAX_VDI_LEN, rlen = 0;
|
|
SheepdogVdiReq hdr = {
|
|
.opcode = SD_OP_DEL_VDI,
|
|
.base_vdi_id = s->inode.vdi_id,
|
|
.data_length = wlen,
|
|
.flags = SD_FLAG_CMD_WRITE,
|
|
};
|
|
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
int fd, ret;
|
|
|
|
fd = connect_to_sdog(s, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
return false;
|
|
}
|
|
|
|
ret = do_req(fd, s->bs, (SheepdogReq *)&hdr,
|
|
s->name, &wlen, &rlen);
|
|
closesocket(fd);
|
|
if (ret) {
|
|
return false;
|
|
}
|
|
switch (rsp->result) {
|
|
case SD_RES_NO_VDI:
|
|
error_report("%s was already deleted", s->name);
|
|
/* fall through */
|
|
case SD_RES_SUCCESS:
|
|
break;
|
|
default:
|
|
error_report("%s, %s", sd_strerror(rsp->result), s->name);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Create a writable VDI from a snapshot
|
|
*/
|
|
static int sd_create_branch(BDRVSheepdogState *s)
|
|
{
|
|
Error *local_err = NULL;
|
|
int ret, fd;
|
|
uint32_t vid;
|
|
char *buf;
|
|
bool deleted;
|
|
|
|
DPRINTF("%" PRIx32 " is snapshot.\n", s->inode.vdi_id);
|
|
|
|
buf = g_malloc(SD_INODE_SIZE);
|
|
|
|
/*
|
|
* Even If deletion fails, we will just create extra snapshot based on
|
|
* the working VDI which was supposed to be deleted. So no need to
|
|
* false bail out.
|
|
*/
|
|
deleted = sd_delete(s);
|
|
ret = do_sd_create(s, &vid, !deleted, &local_err);
|
|
if (ret) {
|
|
error_report_err(local_err);
|
|
goto out;
|
|
}
|
|
|
|
DPRINTF("%" PRIx32 " is created.\n", vid);
|
|
|
|
fd = connect_to_sdog(s, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
ret = fd;
|
|
goto out;
|
|
}
|
|
|
|
ret = read_object(fd, s->bs, buf, vid_to_vdi_oid(vid),
|
|
s->inode.nr_copies, SD_INODE_SIZE, 0, s->cache_flags);
|
|
|
|
closesocket(fd);
|
|
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&s->inode, buf, sizeof(s->inode));
|
|
|
|
s->is_snapshot = false;
|
|
ret = 0;
|
|
DPRINTF("%" PRIx32 " was newly created.\n", s->inode.vdi_id);
|
|
|
|
out:
|
|
g_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Send I/O requests to the server.
|
|
*
|
|
* This function sends requests to the server, links the requests to
|
|
* the inflight_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.
|
|
*
|
|
* Returns 1 when we need to wait a response, 0 when there is no sent
|
|
* request and -errno in error cases.
|
|
*/
|
|
static void coroutine_fn sd_co_rw_vector(SheepdogAIOCB *acb)
|
|
{
|
|
int ret = 0;
|
|
unsigned long len, done = 0, total = acb->nb_sectors * BDRV_SECTOR_SIZE;
|
|
unsigned long idx;
|
|
uint32_t object_size;
|
|
uint64_t oid;
|
|
uint64_t offset;
|
|
BDRVSheepdogState *s = acb->s;
|
|
SheepdogInode *inode = &s->inode;
|
|
AIOReq *aio_req;
|
|
|
|
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;
|
|
return;
|
|
}
|
|
}
|
|
|
|
object_size = (UINT32_C(1) << inode->block_size_shift);
|
|
idx = acb->sector_num * BDRV_SECTOR_SIZE / object_size;
|
|
offset = (acb->sector_num * BDRV_SECTOR_SIZE) % object_size;
|
|
|
|
/*
|
|
* Make sure we don't free the aiocb before we are done with all requests.
|
|
* This additional reference is dropped at the end of this function.
|
|
*/
|
|
acb->nr_pending++;
|
|
|
|
while (done != total) {
|
|
uint8_t flags = 0;
|
|
uint64_t old_oid = 0;
|
|
bool create = false;
|
|
|
|
oid = vid_to_data_oid(inode->data_vdi_id[idx], idx);
|
|
|
|
len = MIN(total - done, object_size - offset);
|
|
|
|
switch (acb->aiocb_type) {
|
|
case AIOCB_READ_UDATA:
|
|
if (!inode->data_vdi_id[idx]) {
|
|
qemu_iovec_memset(acb->qiov, done, 0, len);
|
|
goto done;
|
|
}
|
|
break;
|
|
case AIOCB_WRITE_UDATA:
|
|
if (!inode->data_vdi_id[idx]) {
|
|
create = true;
|
|
} else if (!is_data_obj_writable(inode, idx)) {
|
|
/* Copy-On-Write */
|
|
create = true;
|
|
old_oid = oid;
|
|
flags = SD_FLAG_CMD_COW;
|
|
}
|
|
break;
|
|
case AIOCB_DISCARD_OBJ:
|
|
/*
|
|
* We discard the object only when the whole object is
|
|
* 1) allocated 2) trimmed. Otherwise, simply skip it.
|
|
*/
|
|
if (len != object_size || inode->data_vdi_id[idx] == 0) {
|
|
goto done;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (create) {
|
|
DPRINTF("update ino (%" PRIu32 ") %" PRIu64 " %" PRIu64 " %ld\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 %" PRIx64 "\n", oid);
|
|
}
|
|
|
|
aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, create,
|
|
old_oid,
|
|
acb->aiocb_type == AIOCB_DISCARD_OBJ ?
|
|
0 : done);
|
|
add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
|
|
acb->aiocb_type);
|
|
done:
|
|
offset = 0;
|
|
idx++;
|
|
done += len;
|
|
}
|
|
if (--acb->nr_pending) {
|
|
qemu_coroutine_yield();
|
|
}
|
|
}
|
|
|
|
static void sd_aio_complete(SheepdogAIOCB *acb)
|
|
{
|
|
BDRVSheepdogState *s;
|
|
if (acb->aiocb_type == AIOCB_FLUSH_CACHE) {
|
|
return;
|
|
}
|
|
|
|
s = acb->s;
|
|
qemu_co_mutex_lock(&s->queue_lock);
|
|
QLIST_REMOVE(acb, aiocb_siblings);
|
|
qemu_co_queue_restart_all(&s->overlapping_queue);
|
|
qemu_co_mutex_unlock(&s->queue_lock);
|
|
}
|
|
|
|
static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, QEMUIOVector *qiov)
|
|
{
|
|
SheepdogAIOCB acb;
|
|
int ret;
|
|
int64_t offset = (sector_num + nb_sectors) * BDRV_SECTOR_SIZE;
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
|
|
if (offset > s->inode.vdi_size) {
|
|
ret = sd_truncate(bs, offset, PREALLOC_MODE_OFF, NULL);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
sd_aio_setup(&acb, s, qiov, sector_num, nb_sectors, AIOCB_WRITE_UDATA);
|
|
sd_co_rw_vector(&acb);
|
|
sd_write_done(&acb);
|
|
sd_aio_complete(&acb);
|
|
|
|
return acb.ret;
|
|
}
|
|
|
|
static coroutine_fn int sd_co_readv(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, QEMUIOVector *qiov)
|
|
{
|
|
SheepdogAIOCB acb;
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
|
|
sd_aio_setup(&acb, s, qiov, sector_num, nb_sectors, AIOCB_READ_UDATA);
|
|
sd_co_rw_vector(&acb);
|
|
sd_aio_complete(&acb);
|
|
|
|
return acb.ret;
|
|
}
|
|
|
|
static int coroutine_fn sd_co_flush_to_disk(BlockDriverState *bs)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
SheepdogAIOCB acb;
|
|
AIOReq *aio_req;
|
|
|
|
if (s->cache_flags != SD_FLAG_CMD_CACHE) {
|
|
return 0;
|
|
}
|
|
|
|
sd_aio_setup(&acb, s, NULL, 0, 0, AIOCB_FLUSH_CACHE);
|
|
|
|
acb.nr_pending++;
|
|
aio_req = alloc_aio_req(s, &acb, vid_to_vdi_oid(s->inode.vdi_id),
|
|
0, 0, 0, false, 0, 0);
|
|
add_aio_request(s, aio_req, NULL, 0, acb.aiocb_type);
|
|
|
|
if (--acb.nr_pending) {
|
|
qemu_coroutine_yield();
|
|
}
|
|
|
|
sd_aio_complete(&acb);
|
|
return acb.ret;
|
|
}
|
|
|
|
static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
|
|
{
|
|
Error *local_err = NULL;
|
|
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 %" PRId64 " "
|
|
"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 ").", 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;
|
|
/* It appears that inode.tag does not require a NUL terminator,
|
|
* which means this use of strncpy is ok.
|
|
*/
|
|
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);
|
|
inode = g_malloc(datalen);
|
|
|
|
/* refresh inode. */
|
|
fd = connect_to_sdog(s, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
ret = fd;
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = write_object(fd, s->bs, (char *)&s->inode,
|
|
vid_to_vdi_oid(s->inode.vdi_id), s->inode.nr_copies,
|
|
datalen, 0, false, s->cache_flags);
|
|
if (ret < 0) {
|
|
error_report("failed to write snapshot's inode.");
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = do_sd_create(s, &new_vid, 1, &local_err);
|
|
if (ret < 0) {
|
|
error_reportf_err(local_err,
|
|
"failed to create inode for snapshot: ");
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = read_object(fd, s->bs, (char *)inode,
|
|
vid_to_vdi_oid(new_vid), s->inode.nr_copies, datalen, 0,
|
|
s->cache_flags);
|
|
|
|
if (ret < 0) {
|
|
error_report("failed to read new inode info. %s", strerror(errno));
|
|
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:
|
|
g_free(inode);
|
|
closesocket(fd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We implement rollback(loadvm) operation to the specified snapshot by
|
|
* 1) switch to the snapshot
|
|
* 2) rely on sd_create_branch to delete working VDI and
|
|
* 3) create a new working VDI based on the specified snapshot
|
|
*/
|
|
static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
BDRVSheepdogState *old_s;
|
|
char tag[SD_MAX_VDI_TAG_LEN];
|
|
uint32_t snapid = 0;
|
|
int ret;
|
|
|
|
if (!sd_parse_snapid_or_tag(snapshot_id, &snapid, tag)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
old_s = g_new(BDRVSheepdogState, 1);
|
|
|
|
memcpy(old_s, s, sizeof(BDRVSheepdogState));
|
|
|
|
ret = reload_inode(s, snapid, tag);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
ret = sd_create_branch(s);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
g_free(old_s);
|
|
|
|
return 0;
|
|
out:
|
|
/* recover bdrv_sd_state */
|
|
memcpy(s, old_s, sizeof(BDRVSheepdogState));
|
|
g_free(old_s);
|
|
|
|
error_report("failed to open. recover old bdrv_sd_state.");
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define NR_BATCHED_DISCARD 128
|
|
|
|
static int remove_objects(BDRVSheepdogState *s, Error **errp)
|
|
{
|
|
int fd, i = 0, nr_objs = 0;
|
|
int ret;
|
|
SheepdogInode *inode = &s->inode;
|
|
|
|
fd = connect_to_sdog(s, errp);
|
|
if (fd < 0) {
|
|
return fd;
|
|
}
|
|
|
|
nr_objs = count_data_objs(inode);
|
|
while (i < nr_objs) {
|
|
int start_idx, nr_filled_idx;
|
|
|
|
while (i < nr_objs && !inode->data_vdi_id[i]) {
|
|
i++;
|
|
}
|
|
start_idx = i;
|
|
|
|
nr_filled_idx = 0;
|
|
while (i < nr_objs && nr_filled_idx < NR_BATCHED_DISCARD) {
|
|
if (inode->data_vdi_id[i]) {
|
|
inode->data_vdi_id[i] = 0;
|
|
nr_filled_idx++;
|
|
}
|
|
|
|
i++;
|
|
}
|
|
|
|
ret = write_object(fd, s->bs,
|
|
(char *)&inode->data_vdi_id[start_idx],
|
|
vid_to_vdi_oid(s->inode.vdi_id), inode->nr_copies,
|
|
(i - start_idx) * sizeof(uint32_t),
|
|
offsetof(struct SheepdogInode,
|
|
data_vdi_id[start_idx]),
|
|
false, s->cache_flags);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Failed to discard snapshot inode");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
closesocket(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int sd_snapshot_delete(BlockDriverState *bs,
|
|
const char *snapshot_id,
|
|
const char *name,
|
|
Error **errp)
|
|
{
|
|
/*
|
|
* FIXME should delete the snapshot matching both @snapshot_id and
|
|
* @name, but @name not used here
|
|
*/
|
|
unsigned long snap_id = 0;
|
|
char snap_tag[SD_MAX_VDI_TAG_LEN];
|
|
int fd, ret;
|
|
char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN];
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
unsigned int wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN, rlen = 0;
|
|
uint32_t vid;
|
|
SheepdogVdiReq hdr = {
|
|
.opcode = SD_OP_DEL_VDI,
|
|
.data_length = wlen,
|
|
.flags = SD_FLAG_CMD_WRITE,
|
|
};
|
|
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
|
|
|
|
ret = remove_objects(s, errp);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
memset(snap_tag, 0, sizeof(snap_tag));
|
|
pstrcpy(buf, SD_MAX_VDI_LEN, s->name);
|
|
/* TODO Use sd_parse_snapid() once this mess is cleaned up */
|
|
ret = qemu_strtoul(snapshot_id, NULL, 10, &snap_id);
|
|
if (ret || snap_id > UINT32_MAX) {
|
|
/*
|
|
* FIXME Since qemu_strtoul() returns -EINVAL when
|
|
* @snapshot_id is null, @snapshot_id is mandatory. Correct
|
|
* would be to require at least one of @snapshot_id and @name.
|
|
*/
|
|
error_setg(errp, "Invalid snapshot ID: %s",
|
|
snapshot_id ? snapshot_id : "<null>");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (snap_id) {
|
|
hdr.snapid = (uint32_t) snap_id;
|
|
} else {
|
|
/* FIXME I suspect we should use @name here */
|
|
/* FIXME don't truncate silently */
|
|
pstrcpy(snap_tag, sizeof(snap_tag), snapshot_id);
|
|
pstrcpy(buf + SD_MAX_VDI_LEN, SD_MAX_VDI_TAG_LEN, snap_tag);
|
|
}
|
|
|
|
ret = find_vdi_name(s, s->name, snap_id, snap_tag, &vid, true, errp);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
fd = connect_to_sdog(s, errp);
|
|
if (fd < 0) {
|
|
return fd;
|
|
}
|
|
|
|
ret = do_req(fd, s->bs, (SheepdogReq *)&hdr,
|
|
buf, &wlen, &rlen);
|
|
closesocket(fd);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret, "Couldn't send request to server");
|
|
return ret;
|
|
}
|
|
|
|
switch (rsp->result) {
|
|
case SD_RES_NO_VDI:
|
|
error_setg(errp, "Can't find the snapshot");
|
|
return -ENOENT;
|
|
case SD_RES_SUCCESS:
|
|
break;
|
|
default:
|
|
error_setg(errp, "%s", sd_strerror(rsp->result));
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
|
|
{
|
|
Error *local_err = NULL;
|
|
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 = g_malloc(max);
|
|
|
|
fd = connect_to_sdog(s, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
ret = fd;
|
|
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, s->bs, &req, vdi_inuse, &wlen, &rlen);
|
|
|
|
closesocket(fd);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
sn_tab = g_new0(QEMUSnapshotInfo, nr);
|
|
|
|
/* 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, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
ret = fd;
|
|
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, s->bs, (char *)&inode,
|
|
vid_to_vdi_oid(vid),
|
|
0, SD_INODE_SIZE - sizeof(inode.data_vdi_id), 0,
|
|
s->cache_flags);
|
|
|
|
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),
|
|
"%" PRIu32, inode.snap_id);
|
|
pstrcpy(sn_tab[found].name,
|
|
MIN(sizeof(sn_tab[found].name), sizeof(inode.tag)),
|
|
inode.tag);
|
|
found++;
|
|
}
|
|
}
|
|
|
|
closesocket(fd);
|
|
out:
|
|
*psn_tab = sn_tab;
|
|
|
|
g_free(vdi_inuse);
|
|
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data,
|
|
int64_t pos, int size, int load)
|
|
{
|
|
Error *local_err = NULL;
|
|
bool create;
|
|
int fd, ret = 0, remaining = size;
|
|
unsigned int data_len;
|
|
uint64_t vmstate_oid;
|
|
uint64_t offset;
|
|
uint32_t vdi_index;
|
|
uint32_t vdi_id = load ? s->inode.parent_vdi_id : s->inode.vdi_id;
|
|
uint32_t object_size = (UINT32_C(1) << s->inode.block_size_shift);
|
|
|
|
fd = connect_to_sdog(s, &local_err);
|
|
if (fd < 0) {
|
|
error_report_err(local_err);
|
|
return fd;
|
|
}
|
|
|
|
while (remaining) {
|
|
vdi_index = pos / object_size;
|
|
offset = pos % object_size;
|
|
|
|
data_len = MIN(remaining, object_size - offset);
|
|
|
|
vmstate_oid = vid_to_vmstate_oid(vdi_id, vdi_index);
|
|
|
|
create = (offset == 0);
|
|
if (load) {
|
|
ret = read_object(fd, s->bs, (char *)data, vmstate_oid,
|
|
s->inode.nr_copies, data_len, offset,
|
|
s->cache_flags);
|
|
} else {
|
|
ret = write_object(fd, s->bs, (char *)data, vmstate_oid,
|
|
s->inode.nr_copies, data_len, offset, create,
|
|
s->cache_flags);
|
|
}
|
|
|
|
if (ret < 0) {
|
|
error_report("failed to save vmstate %s", strerror(errno));
|
|
goto cleanup;
|
|
}
|
|
|
|
pos += data_len;
|
|
data += data_len;
|
|
remaining -= data_len;
|
|
}
|
|
ret = size;
|
|
cleanup:
|
|
closesocket(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int sd_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
|
|
int64_t pos)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
void *buf;
|
|
int ret;
|
|
|
|
buf = qemu_blockalign(bs, qiov->size);
|
|
qemu_iovec_to_buf(qiov, 0, buf, qiov->size);
|
|
ret = do_load_save_vmstate(s, (uint8_t *) buf, pos, qiov->size, 0);
|
|
qemu_vfree(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sd_load_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
|
|
int64_t pos)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
void *buf;
|
|
int ret;
|
|
|
|
buf = qemu_blockalign(bs, qiov->size);
|
|
ret = do_load_save_vmstate(s, buf, pos, qiov->size, 1);
|
|
qemu_iovec_from_buf(qiov, 0, buf, qiov->size);
|
|
qemu_vfree(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static coroutine_fn int sd_co_pdiscard(BlockDriverState *bs, int64_t offset,
|
|
int bytes)
|
|
{
|
|
SheepdogAIOCB acb;
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
QEMUIOVector discard_iov;
|
|
struct iovec iov;
|
|
uint32_t zero = 0;
|
|
|
|
if (!s->discard_supported) {
|
|
return 0;
|
|
}
|
|
|
|
memset(&discard_iov, 0, sizeof(discard_iov));
|
|
memset(&iov, 0, sizeof(iov));
|
|
iov.iov_base = &zero;
|
|
iov.iov_len = sizeof(zero);
|
|
discard_iov.iov = &iov;
|
|
discard_iov.niov = 1;
|
|
if (!QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)) {
|
|
return -ENOTSUP;
|
|
}
|
|
sd_aio_setup(&acb, s, &discard_iov, offset >> BDRV_SECTOR_BITS,
|
|
bytes >> BDRV_SECTOR_BITS, AIOCB_DISCARD_OBJ);
|
|
sd_co_rw_vector(&acb);
|
|
sd_aio_complete(&acb);
|
|
|
|
return acb.ret;
|
|
}
|
|
|
|
static coroutine_fn int64_t
|
|
sd_co_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
|
|
int *pnum, BlockDriverState **file)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
SheepdogInode *inode = &s->inode;
|
|
uint32_t object_size = (UINT32_C(1) << inode->block_size_shift);
|
|
uint64_t offset = sector_num * BDRV_SECTOR_SIZE;
|
|
unsigned long start = offset / object_size,
|
|
end = DIV_ROUND_UP((sector_num + nb_sectors) *
|
|
BDRV_SECTOR_SIZE, object_size);
|
|
unsigned long idx;
|
|
int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
|
|
|
|
for (idx = start; idx < end; idx++) {
|
|
if (inode->data_vdi_id[idx] == 0) {
|
|
break;
|
|
}
|
|
}
|
|
if (idx == start) {
|
|
/* Get the longest length of unallocated sectors */
|
|
ret = 0;
|
|
for (idx = start + 1; idx < end; idx++) {
|
|
if (inode->data_vdi_id[idx] != 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
*pnum = (idx - start) * object_size / BDRV_SECTOR_SIZE;
|
|
if (*pnum > nb_sectors) {
|
|
*pnum = nb_sectors;
|
|
}
|
|
if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) {
|
|
*file = bs;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int64_t sd_get_allocated_file_size(BlockDriverState *bs)
|
|
{
|
|
BDRVSheepdogState *s = bs->opaque;
|
|
SheepdogInode *inode = &s->inode;
|
|
uint32_t object_size = (UINT32_C(1) << inode->block_size_shift);
|
|
unsigned long i, last = DIV_ROUND_UP(inode->vdi_size, object_size);
|
|
uint64_t size = 0;
|
|
|
|
for (i = 0; i < last; i++) {
|
|
if (inode->data_vdi_id[i] == 0) {
|
|
continue;
|
|
}
|
|
size += object_size;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
static QemuOptsList sd_create_opts = {
|
|
.name = "sheepdog-create-opts",
|
|
.head = QTAILQ_HEAD_INITIALIZER(sd_create_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_BACKING_FILE,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "File name of a base image"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_PREALLOC,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Preallocation mode (allowed values: off, full)"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_REDUNDANCY,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Redundancy of the image"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_OBJECT_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Object size of the image"
|
|
},
|
|
{ /* end of list */ }
|
|
}
|
|
};
|
|
|
|
static BlockDriver bdrv_sheepdog = {
|
|
.format_name = "sheepdog",
|
|
.protocol_name = "sheepdog",
|
|
.instance_size = sizeof(BDRVSheepdogState),
|
|
.bdrv_parse_filename = sd_parse_filename,
|
|
.bdrv_file_open = sd_open,
|
|
.bdrv_reopen_prepare = sd_reopen_prepare,
|
|
.bdrv_reopen_commit = sd_reopen_commit,
|
|
.bdrv_reopen_abort = sd_reopen_abort,
|
|
.bdrv_close = sd_close,
|
|
.bdrv_create = sd_create,
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_getlength = sd_getlength,
|
|
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
|
|
.bdrv_truncate = sd_truncate,
|
|
|
|
.bdrv_co_readv = sd_co_readv,
|
|
.bdrv_co_writev = sd_co_writev,
|
|
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
|
|
.bdrv_co_pdiscard = sd_co_pdiscard,
|
|
.bdrv_co_get_block_status = sd_co_get_block_status,
|
|
|
|
.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,
|
|
|
|
.bdrv_detach_aio_context = sd_detach_aio_context,
|
|
.bdrv_attach_aio_context = sd_attach_aio_context,
|
|
|
|
.create_opts = &sd_create_opts,
|
|
};
|
|
|
|
static BlockDriver bdrv_sheepdog_tcp = {
|
|
.format_name = "sheepdog",
|
|
.protocol_name = "sheepdog+tcp",
|
|
.instance_size = sizeof(BDRVSheepdogState),
|
|
.bdrv_parse_filename = sd_parse_filename,
|
|
.bdrv_file_open = sd_open,
|
|
.bdrv_reopen_prepare = sd_reopen_prepare,
|
|
.bdrv_reopen_commit = sd_reopen_commit,
|
|
.bdrv_reopen_abort = sd_reopen_abort,
|
|
.bdrv_close = sd_close,
|
|
.bdrv_create = sd_create,
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_getlength = sd_getlength,
|
|
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
|
|
.bdrv_truncate = sd_truncate,
|
|
|
|
.bdrv_co_readv = sd_co_readv,
|
|
.bdrv_co_writev = sd_co_writev,
|
|
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
|
|
.bdrv_co_pdiscard = sd_co_pdiscard,
|
|
.bdrv_co_get_block_status = sd_co_get_block_status,
|
|
|
|
.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,
|
|
|
|
.bdrv_detach_aio_context = sd_detach_aio_context,
|
|
.bdrv_attach_aio_context = sd_attach_aio_context,
|
|
|
|
.create_opts = &sd_create_opts,
|
|
};
|
|
|
|
static BlockDriver bdrv_sheepdog_unix = {
|
|
.format_name = "sheepdog",
|
|
.protocol_name = "sheepdog+unix",
|
|
.instance_size = sizeof(BDRVSheepdogState),
|
|
.bdrv_parse_filename = sd_parse_filename,
|
|
.bdrv_file_open = sd_open,
|
|
.bdrv_reopen_prepare = sd_reopen_prepare,
|
|
.bdrv_reopen_commit = sd_reopen_commit,
|
|
.bdrv_reopen_abort = sd_reopen_abort,
|
|
.bdrv_close = sd_close,
|
|
.bdrv_create = sd_create,
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_getlength = sd_getlength,
|
|
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
|
|
.bdrv_truncate = sd_truncate,
|
|
|
|
.bdrv_co_readv = sd_co_readv,
|
|
.bdrv_co_writev = sd_co_writev,
|
|
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
|
|
.bdrv_co_pdiscard = sd_co_pdiscard,
|
|
.bdrv_co_get_block_status = sd_co_get_block_status,
|
|
|
|
.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,
|
|
|
|
.bdrv_detach_aio_context = sd_detach_aio_context,
|
|
.bdrv_attach_aio_context = sd_attach_aio_context,
|
|
|
|
.create_opts = &sd_create_opts,
|
|
};
|
|
|
|
static void bdrv_sheepdog_init(void)
|
|
{
|
|
bdrv_register(&bdrv_sheepdog);
|
|
bdrv_register(&bdrv_sheepdog_tcp);
|
|
bdrv_register(&bdrv_sheepdog_unix);
|
|
}
|
|
block_init(bdrv_sheepdog_init);
|