2
* Copyright (C) 2009-2010 Nippon Telegraph and Telephone Corporation.
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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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* 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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#include "qemu-common.h"
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#include "qemu-error.h"
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#include "qemu_socket.h"
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#include "block_int.h"
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#define SD_PROTO_VER 0x01
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#define SD_DEFAULT_ADDR "localhost"
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#define SD_DEFAULT_PORT "7000"
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#define SD_OP_CREATE_AND_WRITE_OBJ 0x01
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#define SD_OP_READ_OBJ 0x02
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#define SD_OP_WRITE_OBJ 0x03
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#define SD_OP_NEW_VDI 0x11
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#define SD_OP_LOCK_VDI 0x12
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#define SD_OP_RELEASE_VDI 0x13
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#define SD_OP_GET_VDI_INFO 0x14
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#define SD_OP_READ_VDIS 0x15
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#define SD_FLAG_CMD_WRITE 0x01
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#define SD_FLAG_CMD_COW 0x02
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#define SD_RES_SUCCESS 0x00 /* Success */
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#define SD_RES_UNKNOWN 0x01 /* Unknown error */
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#define SD_RES_NO_OBJ 0x02 /* No object found */
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#define SD_RES_EIO 0x03 /* I/O error */
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#define SD_RES_VDI_EXIST 0x04 /* Vdi exists already */
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#define SD_RES_INVALID_PARMS 0x05 /* Invalid parameters */
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#define SD_RES_SYSTEM_ERROR 0x06 /* System error */
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#define SD_RES_VDI_LOCKED 0x07 /* Vdi is locked */
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#define SD_RES_NO_VDI 0x08 /* No vdi found */
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#define SD_RES_NO_BASE_VDI 0x09 /* No base vdi found */
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#define SD_RES_VDI_READ 0x0A /* Cannot read requested vdi */
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#define SD_RES_VDI_WRITE 0x0B /* Cannot write requested vdi */
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#define SD_RES_BASE_VDI_READ 0x0C /* Cannot read base vdi */
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#define SD_RES_BASE_VDI_WRITE 0x0D /* Cannot write base vdi */
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#define SD_RES_NO_TAG 0x0E /* Requested tag is not found */
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#define SD_RES_STARTUP 0x0F /* Sheepdog is on starting up */
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#define SD_RES_VDI_NOT_LOCKED 0x10 /* Vdi is not locked */
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#define SD_RES_SHUTDOWN 0x11 /* Sheepdog is shutting down */
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#define SD_RES_NO_MEM 0x12 /* Cannot allocate memory */
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#define SD_RES_FULL_VDI 0x13 /* we already have the maximum vdis */
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#define SD_RES_VER_MISMATCH 0x14 /* Protocol version mismatch */
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#define SD_RES_NO_SPACE 0x15 /* Server has no room for new objects */
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#define SD_RES_WAIT_FOR_FORMAT 0x16 /* Waiting for a format operation */
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#define SD_RES_WAIT_FOR_JOIN 0x17 /* Waiting for other nodes joining */
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#define SD_RES_JOIN_FAILED 0x18 /* Target node had failed to join sheepdog */
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* 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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#define VDI_SPACE_SHIFT 32
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#define VDI_BIT (UINT64_C(1) << 63)
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#define VMSTATE_BIT (UINT64_C(1) << 62)
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#define MAX_DATA_OBJS (UINT64_C(1) << 20)
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#define MAX_CHILDREN 1024
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#define SD_MAX_VDI_LEN 256
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#define SD_MAX_VDI_TAG_LEN 256
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#define SD_NR_VDIS (1U << 24)
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#define SD_DATA_OBJ_SIZE (UINT64_C(1) << 22)
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#define SD_MAX_VDI_SIZE (SD_DATA_OBJ_SIZE * MAX_DATA_OBJS)
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#define SECTOR_SIZE 512
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#define SD_INODE_SIZE (sizeof(SheepdogInode))
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#define CURRENT_VDI_ID 0
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typedef struct SheepdogReq {
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uint32_t opcode_specific[8];
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typedef struct SheepdogRsp {
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uint32_t data_length;
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uint32_t opcode_specific[7];
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typedef struct SheepdogObjReq {
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uint32_t data_length;
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typedef struct SheepdogObjRsp {
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uint32_t data_length;
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typedef struct SheepdogVdiReq {
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uint32_t data_length;
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uint32_t base_vdi_id;
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typedef struct SheepdogVdiRsp {
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uint32_t data_length;
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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 vm_clock_nsec;
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uint64_t vm_state_size;
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uint16_t copy_policy;
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uint8_t block_size_shift;
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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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* 64 bit FNV-1a non-zero initial basis
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#define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
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* 64 bit Fowler/Noll/Vo FNV-1a hash code
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static inline uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval)
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unsigned char *bp = buf;
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unsigned char *be = bp + len;
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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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static inline int is_data_obj_writable(SheepdogInode *inode, unsigned int idx)
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return inode->vdi_id == inode->data_vdi_id[idx];
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static inline int is_data_obj(uint64_t oid)
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return !(VDI_BIT & oid);
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static inline uint64_t data_oid_to_idx(uint64_t oid)
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return oid & (MAX_DATA_OBJS - 1);
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static inline uint64_t vid_to_vdi_oid(uint32_t vid)
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return VDI_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT);
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static inline uint64_t vid_to_vmstate_oid(uint32_t vid, uint32_t idx)
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return VMSTATE_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT) | idx;
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static inline uint64_t vid_to_data_oid(uint32_t vid, uint32_t idx)
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return ((uint64_t)vid << VDI_SPACE_SHIFT) | idx;
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static inline int is_snapshot(struct SheepdogInode *inode)
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return !!inode->snap_ctime;
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#define dprintf(fmt, args...) \
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fprintf(stdout, "%s %d: " fmt, __func__, __LINE__, ##args); \
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#define dprintf(fmt, args...)
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typedef struct SheepdogAIOCB SheepdogAIOCB;
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typedef struct AIOReq {
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SheepdogAIOCB *aiocb;
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unsigned int iov_offset;
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unsigned int data_len;
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QLIST_ENTRY(AIOReq) outstanding_aio_siblings;
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QLIST_ENTRY(AIOReq) aioreq_siblings;
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struct SheepdogAIOCB {
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BlockDriverAIOCB common;
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enum AIOCBState aiocb_type;
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Coroutine *coroutine;
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void (*aio_done_func)(SheepdogAIOCB *);
282
QLIST_HEAD(aioreq_head, AIOReq) aioreq_head;
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typedef struct BDRVSheepdogState {
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uint32_t min_dirty_data_idx;
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uint32_t max_dirty_data_idx;
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char name[SD_MAX_VDI_LEN];
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uint32_t aioreq_seq_num;
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QLIST_HEAD(outstanding_aio_head, AIOReq) outstanding_aio_head;
306
static const char * sd_strerror(int err)
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static const struct {
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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"},
341
for (i = 0; i < ARRAY_SIZE(errors); ++i) {
342
if (errors[i].err == err) {
343
return errors[i].desc;
347
return "Invalid error code";
351
* Sheepdog I/O handling:
353
* 1. In sd_co_rw_vector, we send the I/O requests to the server and
354
* link the requests to the outstanding_list in the
355
* BDRVSheepdogState. The function exits without waiting for
356
* receiving the response.
358
* 2. We receive the response in aio_read_response, the fd handler to
359
* the sheepdog connection. If metadata update is needed, we send
360
* the write request to the vdi object in sd_write_done, the write
361
* completion function. We switch back to sd_co_readv/writev after
362
* all the requests belonging to the AIOCB are finished.
365
static inline AIOReq *alloc_aio_req(BDRVSheepdogState *s, SheepdogAIOCB *acb,
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uint64_t oid, unsigned int data_len,
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uint64_t offset, uint8_t flags,
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uint64_t base_oid, unsigned int iov_offset)
372
aio_req = g_malloc(sizeof(*aio_req));
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aio_req->aiocb = acb;
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aio_req->iov_offset = iov_offset;
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aio_req->base_oid = base_oid;
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aio_req->offset = offset;
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aio_req->data_len = data_len;
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aio_req->flags = flags;
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aio_req->id = s->aioreq_seq_num++;
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QLIST_INSERT_HEAD(&s->outstanding_aio_head, aio_req,
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outstanding_aio_siblings);
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QLIST_INSERT_HEAD(&acb->aioreq_head, aio_req, aioreq_siblings);
389
static inline int free_aio_req(BDRVSheepdogState *s, AIOReq *aio_req)
391
SheepdogAIOCB *acb = aio_req->aiocb;
392
QLIST_REMOVE(aio_req, outstanding_aio_siblings);
393
QLIST_REMOVE(aio_req, aioreq_siblings);
396
return !QLIST_EMPTY(&acb->aioreq_head);
399
static void coroutine_fn sd_finish_aiocb(SheepdogAIOCB *acb)
401
if (!acb->canceled) {
402
qemu_coroutine_enter(acb->coroutine, NULL);
404
qemu_aio_release(acb);
407
static void sd_aio_cancel(BlockDriverAIOCB *blockacb)
409
SheepdogAIOCB *acb = (SheepdogAIOCB *)blockacb;
412
* Sheepdog cannot cancel the requests which are already sent to
413
* the servers, so we just complete the request with -EIO here.
416
qemu_coroutine_enter(acb->coroutine, NULL);
420
static AIOPool sd_aio_pool = {
421
.aiocb_size = sizeof(SheepdogAIOCB),
422
.cancel = sd_aio_cancel,
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static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
426
int64_t sector_num, int nb_sectors,
427
BlockDriverCompletionFunc *cb, void *opaque)
431
acb = qemu_aio_get(&sd_aio_pool, bs, cb, opaque);
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acb->sector_num = sector_num;
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acb->nb_sectors = nb_sectors;
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acb->aio_done_func = NULL;
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acb->coroutine = qemu_coroutine_self();
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QLIST_INIT(&acb->aioreq_head);
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struct iovec *msg_iov;
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static ssize_t sendmsg(int s, const struct msghdr *msg, int flags)
459
/* count the msg size */
460
for (i = 0; i < msg->msg_iovlen; i++) {
461
size += msg->msg_iov[i].iov_len;
463
buf = g_malloc(size);
466
for (i = 0; i < msg->msg_iovlen; i++) {
467
memcpy(p, msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len);
468
p += msg->msg_iov[i].iov_len;
471
ret = send(s, buf, size, flags);
477
static ssize_t recvmsg(int s, struct msghdr *msg, int flags)
483
/* count the msg size */
484
for (i = 0; i < msg->msg_iovlen; i++) {
485
size += msg->msg_iov[i].iov_len;
487
buf = g_malloc(size);
489
ret = qemu_recv(s, buf, size, flags);
495
for (i = 0; i < msg->msg_iovlen; i++) {
496
memcpy(msg->msg_iov[i].iov_base, p, msg->msg_iov[i].iov_len);
497
p += msg->msg_iov[i].iov_len;
507
* Send/recv data with iovec buffers
509
* This function send/recv data from/to the iovec buffer directly.
510
* The first `offset' bytes in the iovec buffer are skipped and next
511
* `len' bytes are used.
515
* do_send_recv(sockfd, iov, len, offset, 1);
519
* char *buf = malloc(size);
520
* iov_to_buf(iov, iovcnt, buf, offset, size);
521
* send(sockfd, buf, size, 0);
524
static int do_send_recv(int sockfd, struct iovec *iov, int len, int offset,
530
memset(&msg, 0, sizeof(msg));
536
while (iov->iov_len < len) {
543
diff = iov->iov_len - len;
544
iov->iov_len -= diff;
546
while (msg.msg_iov->iov_len <= offset) {
547
offset -= msg.msg_iov->iov_len;
553
msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base + offset;
554
msg.msg_iov->iov_len -= offset;
557
ret = sendmsg(sockfd, &msg, 0);
559
ret = recvmsg(sockfd, &msg, 0);
562
msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base - offset;
563
msg.msg_iov->iov_len += offset;
565
iov->iov_len += diff;
569
static int connect_to_sdog(const char *addr, const char *port)
571
char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
573
struct addrinfo hints, *res, *res0;
576
addr = SD_DEFAULT_ADDR;
577
port = SD_DEFAULT_PORT;
580
memset(&hints, 0, sizeof(hints));
581
hints.ai_socktype = SOCK_STREAM;
583
ret = getaddrinfo(addr, port, &hints, &res0);
585
error_report("unable to get address info %s, %s",
586
addr, strerror(errno));
590
for (res = res0; res; res = res->ai_next) {
591
ret = getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
592
sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
597
fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
603
ret = connect(fd, res->ai_addr, res->ai_addrlen);
605
if (errno == EINTR) {
611
dprintf("connected to %s:%s\n", addr, port);
615
error_report("failed connect to %s:%s", addr, port);
621
static int do_readv_writev(int sockfd, struct iovec *iov, int len,
622
int iov_offset, int write)
626
ret = do_send_recv(sockfd, iov, len, iov_offset, write);
628
if (errno == EINTR) {
631
if (errno == EAGAIN) {
632
if (qemu_in_coroutine()) {
633
qemu_coroutine_yield();
637
error_report("failed to recv a rsp, %s", strerror(errno));
650
static int do_readv(int sockfd, struct iovec *iov, int len, int iov_offset)
652
return do_readv_writev(sockfd, iov, len, iov_offset, 0);
655
static int do_writev(int sockfd, struct iovec *iov, int len, int iov_offset)
657
return do_readv_writev(sockfd, iov, len, iov_offset, 1);
660
static int do_read_write(int sockfd, void *buf, int len, int write)
667
return do_readv_writev(sockfd, &iov, len, 0, write);
670
static int do_read(int sockfd, void *buf, int len)
672
return do_read_write(sockfd, buf, len, 0);
675
static int do_write(int sockfd, void *buf, int len)
677
return do_read_write(sockfd, buf, len, 1);
680
static int send_req(int sockfd, SheepdogReq *hdr, void *data,
686
iov[0].iov_base = hdr;
687
iov[0].iov_len = sizeof(*hdr);
690
iov[1].iov_base = data;
691
iov[1].iov_len = *wlen;
694
ret = do_writev(sockfd, iov, sizeof(*hdr) + *wlen, 0);
696
error_report("failed to send a req, %s", strerror(errno));
703
static int do_req(int sockfd, SheepdogReq *hdr, void *data,
704
unsigned int *wlen, unsigned int *rlen)
708
ret = send_req(sockfd, hdr, data, wlen);
714
ret = do_read(sockfd, hdr, sizeof(*hdr));
716
error_report("failed to get a rsp, %s", strerror(errno));
721
if (*rlen > hdr->data_length) {
722
*rlen = hdr->data_length;
726
ret = do_read(sockfd, data, *rlen);
728
error_report("failed to get the data, %s", strerror(errno));
738
static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
739
struct iovec *iov, int niov, int create,
740
enum AIOCBState aiocb_type);
743
* This function searchs pending requests to the object `oid', and
746
static void coroutine_fn send_pending_req(BDRVSheepdogState *s, uint64_t oid, uint32_t id)
748
AIOReq *aio_req, *next;
752
QLIST_FOREACH_SAFE(aio_req, &s->outstanding_aio_head,
753
outstanding_aio_siblings, next) {
754
if (id == aio_req->id) {
757
if (aio_req->oid != oid) {
761
acb = aio_req->aiocb;
762
ret = add_aio_request(s, aio_req, acb->qiov->iov,
763
acb->qiov->niov, 0, acb->aiocb_type);
765
error_report("add_aio_request is failed");
766
free_aio_req(s, aio_req);
767
if (QLIST_EMPTY(&acb->aioreq_head)) {
768
sd_finish_aiocb(acb);
775
* Receive responses of the I/O requests.
777
* This function is registered as a fd handler, and called from the
778
* main loop when s->fd is ready for reading responses.
780
static void coroutine_fn aio_read_response(void *opaque)
783
BDRVSheepdogState *s = opaque;
786
AIOReq *aio_req = NULL;
791
if (QLIST_EMPTY(&s->outstanding_aio_head)) {
796
ret = do_read(fd, &rsp, sizeof(rsp));
798
error_report("failed to get the header, %s", strerror(errno));
802
/* find the right aio_req from the outstanding_aio list */
803
QLIST_FOREACH(aio_req, &s->outstanding_aio_head, outstanding_aio_siblings) {
804
if (aio_req->id == rsp.id) {
809
error_report("cannot find aio_req %x", rsp.id);
813
acb = aio_req->aiocb;
815
switch (acb->aiocb_type) {
816
case AIOCB_WRITE_UDATA:
817
if (!is_data_obj(aio_req->oid)) {
820
idx = data_oid_to_idx(aio_req->oid);
822
if (s->inode.data_vdi_id[idx] != s->inode.vdi_id) {
824
* If the object is newly created one, we need to update
825
* the vdi object (metadata object). min_dirty_data_idx
826
* and max_dirty_data_idx are changed to include updated
827
* index between them.
829
s->inode.data_vdi_id[idx] = s->inode.vdi_id;
830
s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx);
831
s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx);
834
* Some requests may be blocked because simultaneous
835
* create requests are not allowed, so we search the
836
* pending requests here.
838
send_pending_req(s, vid_to_data_oid(s->inode.vdi_id, idx), rsp.id);
841
case AIOCB_READ_UDATA:
842
ret = do_readv(fd, acb->qiov->iov, rsp.data_length,
843
aio_req->iov_offset);
845
error_report("failed to get the data, %s", strerror(errno));
851
if (rsp.result != SD_RES_SUCCESS) {
853
error_report("%s", sd_strerror(rsp.result));
856
rest = free_aio_req(s, aio_req);
859
* We've finished all requests which belong to the AIOCB, so
860
* we can switch back to sd_co_readv/writev now.
862
acb->aio_done_func(acb);
868
static void co_read_response(void *opaque)
870
BDRVSheepdogState *s = opaque;
873
s->co_recv = qemu_coroutine_create(aio_read_response);
876
qemu_coroutine_enter(s->co_recv, opaque);
879
static void co_write_request(void *opaque)
881
BDRVSheepdogState *s = opaque;
883
qemu_coroutine_enter(s->co_send, NULL);
886
static int aio_flush_request(void *opaque)
888
BDRVSheepdogState *s = opaque;
890
return !QLIST_EMPTY(&s->outstanding_aio_head);
893
#if !defined(SOL_TCP) || !defined(TCP_CORK)
895
static int set_cork(int fd, int v)
902
static int set_cork(int fd, int v)
904
return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
909
static int set_nodelay(int fd)
914
ret = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt));
919
* Return a socket discriptor to read/write objects.
921
* We cannot use this discriptor for other operations because
922
* the block driver may be on waiting response from the server.
924
static int get_sheep_fd(BDRVSheepdogState *s)
928
fd = connect_to_sdog(s->addr, s->port);
930
error_report("%s", strerror(errno));
934
socket_set_nonblock(fd);
936
ret = set_nodelay(fd);
938
error_report("%s", strerror(errno));
943
qemu_aio_set_fd_handler(fd, co_read_response, NULL, aio_flush_request,
951
* filename must be one of the following formats:
953
* 2. [vdiname]:[snapid]
955
* 4. [hostname]:[port]:[vdiname]
956
* 5. [hostname]:[port]:[vdiname]:[snapid]
957
* 6. [hostname]:[port]:[vdiname]:[tag]
959
* You can boot from the snapshot images by specifying `snapid` or
962
* You can run VMs outside the Sheepdog cluster by specifying
963
* `hostname' and `port' (experimental).
965
static int parse_vdiname(BDRVSheepdogState *s, const char *filename,
966
char *vdi, uint32_t *snapid, char *tag)
971
p = q = g_strdup(filename);
973
/* count the number of separators */
983
/* use the first two tokens as hostname and port number. */
997
strncpy(vdi, p, SD_MAX_VDI_LEN);
999
p = strchr(vdi, ':');
1002
*snapid = strtoul(p, NULL, 10);
1004
strncpy(tag, p, SD_MAX_VDI_TAG_LEN);
1007
*snapid = CURRENT_VDI_ID; /* search current vdi */
1010
if (s->addr == NULL) {
1017
static int find_vdi_name(BDRVSheepdogState *s, char *filename, uint32_t snapid,
1018
char *tag, uint32_t *vid, int for_snapshot)
1022
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
1023
unsigned int wlen, rlen = 0;
1024
char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN];
1026
fd = connect_to_sdog(s->addr, s->port);
1031
memset(buf, 0, sizeof(buf));
1032
strncpy(buf, filename, SD_MAX_VDI_LEN);
1033
strncpy(buf + SD_MAX_VDI_LEN, tag, SD_MAX_VDI_TAG_LEN);
1035
memset(&hdr, 0, sizeof(hdr));
1037
hdr.opcode = SD_OP_GET_VDI_INFO;
1039
hdr.opcode = SD_OP_LOCK_VDI;
1041
wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN;
1042
hdr.proto_ver = SD_PROTO_VER;
1043
hdr.data_length = wlen;
1044
hdr.snapid = snapid;
1045
hdr.flags = SD_FLAG_CMD_WRITE;
1047
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
1053
if (rsp->result != SD_RES_SUCCESS) {
1054
error_report("cannot get vdi info, %s, %s %d %s",
1055
sd_strerror(rsp->result), filename, snapid, tag);
1067
static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
1068
struct iovec *iov, int niov, int create,
1069
enum AIOCBState aiocb_type)
1071
int nr_copies = s->inode.nr_copies;
1075
uint64_t oid = aio_req->oid;
1076
unsigned int datalen = aio_req->data_len;
1077
uint64_t offset = aio_req->offset;
1078
uint8_t flags = aio_req->flags;
1079
uint64_t old_oid = aio_req->base_oid;
1082
error_report("bug");
1085
memset(&hdr, 0, sizeof(hdr));
1087
if (aiocb_type == AIOCB_READ_UDATA) {
1089
hdr.opcode = SD_OP_READ_OBJ;
1091
} else if (create) {
1093
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ;
1094
hdr.flags = SD_FLAG_CMD_WRITE | flags;
1097
hdr.opcode = SD_OP_WRITE_OBJ;
1098
hdr.flags = SD_FLAG_CMD_WRITE | flags;
1102
hdr.cow_oid = old_oid;
1103
hdr.copies = s->inode.nr_copies;
1105
hdr.data_length = datalen;
1106
hdr.offset = offset;
1108
hdr.id = aio_req->id;
1110
qemu_co_mutex_lock(&s->lock);
1111
s->co_send = qemu_coroutine_self();
1112
qemu_aio_set_fd_handler(s->fd, co_read_response, co_write_request,
1113
aio_flush_request, NULL, s);
1117
ret = do_write(s->fd, &hdr, sizeof(hdr));
1119
qemu_co_mutex_unlock(&s->lock);
1120
error_report("failed to send a req, %s", strerror(errno));
1125
ret = do_writev(s->fd, iov, wlen, aio_req->iov_offset);
1127
qemu_co_mutex_unlock(&s->lock);
1128
error_report("failed to send a data, %s", strerror(errno));
1134
qemu_aio_set_fd_handler(s->fd, co_read_response, NULL,
1135
aio_flush_request, NULL, s);
1136
qemu_co_mutex_unlock(&s->lock);
1141
static int read_write_object(int fd, char *buf, uint64_t oid, int copies,
1142
unsigned int datalen, uint64_t offset,
1143
int write, int create)
1146
SheepdogObjRsp *rsp = (SheepdogObjRsp *)&hdr;
1147
unsigned int wlen, rlen;
1150
memset(&hdr, 0, sizeof(hdr));
1155
hdr.flags = SD_FLAG_CMD_WRITE;
1157
hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ;
1159
hdr.opcode = SD_OP_WRITE_OBJ;
1164
hdr.opcode = SD_OP_READ_OBJ;
1167
hdr.data_length = datalen;
1168
hdr.offset = offset;
1169
hdr.copies = copies;
1171
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
1173
error_report("failed to send a request to the sheep");
1177
switch (rsp->result) {
1178
case SD_RES_SUCCESS:
1181
error_report("%s", sd_strerror(rsp->result));
1186
static int read_object(int fd, char *buf, uint64_t oid, int copies,
1187
unsigned int datalen, uint64_t offset)
1189
return read_write_object(fd, buf, oid, copies, datalen, offset, 0, 0);
1192
static int write_object(int fd, char *buf, uint64_t oid, int copies,
1193
unsigned int datalen, uint64_t offset, int create)
1195
return read_write_object(fd, buf, oid, copies, datalen, offset, 1, create);
1198
static int sd_open(BlockDriverState *bs, const char *filename, int flags)
1202
BDRVSheepdogState *s = bs->opaque;
1203
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
1207
strstart(filename, "sheepdog:", (const char **)&filename);
1209
QLIST_INIT(&s->outstanding_aio_head);
1212
memset(vdi, 0, sizeof(vdi));
1213
memset(tag, 0, sizeof(tag));
1214
if (parse_vdiname(s, filename, vdi, &snapid, tag) < 0) {
1217
s->fd = get_sheep_fd(s);
1222
ret = find_vdi_name(s, vdi, snapid, tag, &vid, 0);
1228
dprintf("%" PRIx32 " snapshot inode was open.\n", vid);
1232
fd = connect_to_sdog(s->addr, s->port);
1234
error_report("failed to connect");
1238
buf = g_malloc(SD_INODE_SIZE);
1239
ret = read_object(fd, buf, vid_to_vdi_oid(vid), 0, SD_INODE_SIZE, 0);
1247
memcpy(&s->inode, buf, sizeof(s->inode));
1248
s->min_dirty_data_idx = UINT32_MAX;
1249
s->max_dirty_data_idx = 0;
1251
bs->total_sectors = s->inode.vdi_size / SECTOR_SIZE;
1252
strncpy(s->name, vdi, sizeof(s->name));
1253
qemu_co_mutex_init(&s->lock);
1257
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL);
1265
static int do_sd_create(char *filename, int64_t vdi_size,
1266
uint32_t base_vid, uint32_t *vdi_id, int snapshot,
1267
const char *addr, const char *port)
1270
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
1272
unsigned int wlen, rlen = 0;
1273
char buf[SD_MAX_VDI_LEN];
1275
fd = connect_to_sdog(addr, port);
1280
memset(buf, 0, sizeof(buf));
1281
strncpy(buf, filename, SD_MAX_VDI_LEN);
1283
memset(&hdr, 0, sizeof(hdr));
1284
hdr.opcode = SD_OP_NEW_VDI;
1285
hdr.base_vdi_id = base_vid;
1287
wlen = SD_MAX_VDI_LEN;
1289
hdr.flags = SD_FLAG_CMD_WRITE;
1290
hdr.snapid = snapshot;
1292
hdr.data_length = wlen;
1293
hdr.vdi_size = vdi_size;
1295
ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
1303
if (rsp->result != SD_RES_SUCCESS) {
1304
error_report("%s, %s", sd_strerror(rsp->result), filename);
1309
*vdi_id = rsp->vdi_id;
1315
static int sd_prealloc(const char *filename)
1317
BlockDriverState *bs = NULL;
1318
uint32_t idx, max_idx;
1320
void *buf = g_malloc0(SD_DATA_OBJ_SIZE);
1323
ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR);
1328
vdi_size = bdrv_getlength(bs);
1333
max_idx = DIV_ROUND_UP(vdi_size, SD_DATA_OBJ_SIZE);
1335
for (idx = 0; idx < max_idx; idx++) {
1337
* The created image can be a cloned image, so we need to read
1338
* a data from the source image.
1340
ret = bdrv_pread(bs, idx * SD_DATA_OBJ_SIZE, buf, SD_DATA_OBJ_SIZE);
1344
ret = bdrv_pwrite(bs, idx * SD_DATA_OBJ_SIZE, buf, SD_DATA_OBJ_SIZE);
1358
static int sd_create(const char *filename, QEMUOptionParameter *options)
1361
uint32_t vid = 0, base_vid = 0;
1362
int64_t vdi_size = 0;
1363
char *backing_file = NULL;
1364
BDRVSheepdogState s;
1365
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
1368
const char *vdiname;
1370
strstart(filename, "sheepdog:", &vdiname);
1372
memset(&s, 0, sizeof(s));
1373
memset(vdi, 0, sizeof(vdi));
1374
memset(tag, 0, sizeof(tag));
1375
if (parse_vdiname(&s, vdiname, vdi, &snapid, tag) < 0) {
1376
error_report("invalid filename");
1380
while (options && options->name) {
1381
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
1382
vdi_size = options->value.n;
1383
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
1384
backing_file = options->value.s;
1385
} else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) {
1386
if (!options->value.s || !strcmp(options->value.s, "off")) {
1388
} else if (!strcmp(options->value.s, "full")) {
1391
error_report("Invalid preallocation mode: '%s'",
1399
if (vdi_size > SD_MAX_VDI_SIZE) {
1400
error_report("too big image size");
1405
BlockDriverState *bs;
1406
BDRVSheepdogState *s;
1409
/* Currently, only Sheepdog backing image is supported. */
1410
drv = bdrv_find_protocol(backing_file);
1411
if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) {
1412
error_report("backing_file must be a sheepdog image");
1416
ret = bdrv_file_open(&bs, backing_file, 0);
1422
if (!is_snapshot(&s->inode)) {
1423
error_report("cannot clone from a non snapshot vdi");
1428
base_vid = s->inode.vdi_id;
1432
ret = do_sd_create(vdi, vdi_size, base_vid, &vid, 0, s.addr, s.port);
1433
if (!prealloc || ret) {
1437
return sd_prealloc(filename);
1440
static void sd_close(BlockDriverState *bs)
1442
BDRVSheepdogState *s = bs->opaque;
1444
SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
1445
unsigned int wlen, rlen = 0;
1448
dprintf("%s\n", s->name);
1450
fd = connect_to_sdog(s->addr, s->port);
1455
memset(&hdr, 0, sizeof(hdr));
1457
hdr.opcode = SD_OP_RELEASE_VDI;
1458
wlen = strlen(s->name) + 1;
1459
hdr.data_length = wlen;
1460
hdr.flags = SD_FLAG_CMD_WRITE;
1462
ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen);
1466
if (!ret && rsp->result != SD_RES_SUCCESS &&
1467
rsp->result != SD_RES_VDI_NOT_LOCKED) {
1468
error_report("%s, %s", sd_strerror(rsp->result), s->name);
1471
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL);
1476
static int64_t sd_getlength(BlockDriverState *bs)
1478
BDRVSheepdogState *s = bs->opaque;
1480
return s->inode.vdi_size;
1483
static int sd_truncate(BlockDriverState *bs, int64_t offset)
1485
BDRVSheepdogState *s = bs->opaque;
1487
unsigned int datalen;
1489
if (offset < s->inode.vdi_size) {
1490
error_report("shrinking is not supported");
1492
} else if (offset > SD_MAX_VDI_SIZE) {
1493
error_report("too big image size");
1497
fd = connect_to_sdog(s->addr, s->port);
1502
/* we don't need to update entire object */
1503
datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
1504
s->inode.vdi_size = offset;
1505
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
1506
s->inode.nr_copies, datalen, 0, 0);
1510
error_report("failed to update an inode.");
1518
* This function is called after writing data objects. If we need to
1519
* update metadata, this sends a write request to the vdi object.
1520
* Otherwise, this switches back to sd_co_readv/writev.
1522
static void coroutine_fn sd_write_done(SheepdogAIOCB *acb)
1525
BDRVSheepdogState *s = acb->common.bs->opaque;
1528
uint32_t offset, data_len, mn, mx;
1530
mn = s->min_dirty_data_idx;
1531
mx = s->max_dirty_data_idx;
1533
/* we need to update the vdi object. */
1534
offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) +
1535
mn * sizeof(s->inode.data_vdi_id[0]);
1536
data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]);
1538
s->min_dirty_data_idx = UINT32_MAX;
1539
s->max_dirty_data_idx = 0;
1541
iov.iov_base = &s->inode;
1542
iov.iov_len = sizeof(s->inode);
1543
aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id),
1544
data_len, offset, 0, 0, offset);
1545
ret = add_aio_request(s, aio_req, &iov, 1, 0, AIOCB_WRITE_UDATA);
1547
free_aio_req(s, aio_req);
1552
acb->aio_done_func = sd_finish_aiocb;
1553
acb->aiocb_type = AIOCB_WRITE_UDATA;
1557
sd_finish_aiocb(acb);
1561
* Create a writable VDI from a snapshot
1563
static int sd_create_branch(BDRVSheepdogState *s)
1569
dprintf("%" PRIx32 " is snapshot.\n", s->inode.vdi_id);
1571
buf = g_malloc(SD_INODE_SIZE);
1573
ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &vid, 1,
1579
dprintf("%" PRIx32 " is created.\n", vid);
1581
fd = connect_to_sdog(s->addr, s->port);
1583
error_report("failed to connect");
1587
ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies,
1596
memcpy(&s->inode, buf, sizeof(s->inode));
1600
dprintf("%" PRIx32 " was newly created.\n", s->inode.vdi_id);
1609
* Send I/O requests to the server.
1611
* This function sends requests to the server, links the requests to
1612
* the outstanding_list in BDRVSheepdogState, and exits without
1613
* waiting the response. The responses are received in the
1614
* `aio_read_response' function which is called from the main loop as
1617
* Returns 1 when we need to wait a response, 0 when there is no sent
1618
* request and -errno in error cases.
1620
static int coroutine_fn sd_co_rw_vector(void *p)
1622
SheepdogAIOCB *acb = p;
1624
unsigned long len, done = 0, total = acb->nb_sectors * SECTOR_SIZE;
1625
unsigned long idx = acb->sector_num * SECTOR_SIZE / SD_DATA_OBJ_SIZE;
1627
uint64_t offset = (acb->sector_num * SECTOR_SIZE) % SD_DATA_OBJ_SIZE;
1628
BDRVSheepdogState *s = acb->common.bs->opaque;
1629
SheepdogInode *inode = &s->inode;
1632
if (acb->aiocb_type == AIOCB_WRITE_UDATA && s->is_snapshot) {
1634
* In the case we open the snapshot VDI, Sheepdog creates the
1635
* writable VDI when we do a write operation first.
1637
ret = sd_create_branch(s);
1644
while (done != total) {
1646
uint64_t old_oid = 0;
1649
oid = vid_to_data_oid(inode->data_vdi_id[idx], idx);
1651
len = MIN(total - done, SD_DATA_OBJ_SIZE - offset);
1653
if (!inode->data_vdi_id[idx]) {
1654
if (acb->aiocb_type == AIOCB_READ_UDATA) {
1659
} else if (acb->aiocb_type == AIOCB_WRITE_UDATA
1660
&& !is_data_obj_writable(inode, idx)) {
1664
flags = SD_FLAG_CMD_COW;
1668
dprintf("update ino (%" PRIu32") %" PRIu64 " %" PRIu64
1669
" %" PRIu64 "\n", inode->vdi_id, oid,
1670
vid_to_data_oid(inode->data_vdi_id[idx], idx), idx);
1671
oid = vid_to_data_oid(inode->vdi_id, idx);
1672
dprintf("new oid %lx\n", oid);
1675
aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, old_oid, done);
1679
QLIST_FOREACH(areq, &s->outstanding_aio_head,
1680
outstanding_aio_siblings) {
1681
if (areq == aio_req) {
1684
if (areq->oid == oid) {
1686
* Sheepdog cannot handle simultaneous create
1687
* requests to the same object. So we cannot send
1688
* the request until the previous request
1692
aio_req->base_oid = 0;
1698
ret = add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
1699
create, acb->aiocb_type);
1701
error_report("add_aio_request is failed");
1702
free_aio_req(s, aio_req);
1712
if (QLIST_EMPTY(&acb->aioreq_head)) {
1718
static int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
1719
int nb_sectors, QEMUIOVector *qiov)
1724
if (bs->growable && sector_num + nb_sectors > bs->total_sectors) {
1725
/* TODO: shouldn't block here */
1726
if (sd_truncate(bs, (sector_num + nb_sectors) * SECTOR_SIZE) < 0) {
1729
bs->total_sectors = sector_num + nb_sectors;
1732
acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors, NULL, NULL);
1733
acb->aio_done_func = sd_write_done;
1734
acb->aiocb_type = AIOCB_WRITE_UDATA;
1736
ret = sd_co_rw_vector(acb);
1738
qemu_aio_release(acb);
1742
qemu_coroutine_yield();
1747
static int sd_co_readv(BlockDriverState *bs, int64_t sector_num,
1748
int nb_sectors, QEMUIOVector *qiov)
1753
acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors, NULL, NULL);
1754
acb->aiocb_type = AIOCB_READ_UDATA;
1755
acb->aio_done_func = sd_finish_aiocb;
1758
* TODO: we can do better; we don't need to initialize
1761
for (i = 0; i < qiov->niov; i++) {
1762
memset(qiov->iov[i].iov_base, 0, qiov->iov[i].iov_len);
1765
ret = sd_co_rw_vector(acb);
1767
qemu_aio_release(acb);
1771
qemu_coroutine_yield();
1776
static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
1778
BDRVSheepdogState *s = bs->opaque;
1781
SheepdogInode *inode;
1782
unsigned int datalen;
1784
dprintf("sn_info: name %s id_str %s s: name %s vm_state_size %d "
1785
"is_snapshot %d\n", sn_info->name, sn_info->id_str,
1786
s->name, sn_info->vm_state_size, s->is_snapshot);
1788
if (s->is_snapshot) {
1789
error_report("You can't create a snapshot of a snapshot VDI, "
1790
"%s (%" PRIu32 ").", s->name, s->inode.vdi_id);
1795
dprintf("%s %s\n", sn_info->name, sn_info->id_str);
1797
s->inode.vm_state_size = sn_info->vm_state_size;
1798
s->inode.vm_clock_nsec = sn_info->vm_clock_nsec;
1799
strncpy(s->inode.tag, sn_info->name, sizeof(s->inode.tag));
1800
/* we don't need to update entire object */
1801
datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
1803
/* refresh inode. */
1804
fd = connect_to_sdog(s->addr, s->port);
1810
ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
1811
s->inode.nr_copies, datalen, 0, 0);
1813
error_report("failed to write snapshot's inode.");
1818
ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &new_vid, 1,
1821
error_report("failed to create inode for snapshot. %s",
1827
inode = (SheepdogInode *)g_malloc(datalen);
1829
ret = read_object(fd, (char *)inode, vid_to_vdi_oid(new_vid),
1830
s->inode.nr_copies, datalen, 0);
1833
error_report("failed to read new inode info. %s", strerror(errno));
1838
memcpy(&s->inode, inode, datalen);
1839
dprintf("s->inode: name %s snap_id %x oid %x\n",
1840
s->inode.name, s->inode.snap_id, s->inode.vdi_id);
1847
static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
1849
BDRVSheepdogState *s = bs->opaque;
1850
BDRVSheepdogState *old_s;
1851
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
1854
uint32_t snapid = 0;
1855
int ret = -ENOENT, fd;
1857
old_s = g_malloc(sizeof(BDRVSheepdogState));
1859
memcpy(old_s, s, sizeof(BDRVSheepdogState));
1861
memset(vdi, 0, sizeof(vdi));
1862
strncpy(vdi, s->name, sizeof(vdi));
1864
memset(tag, 0, sizeof(tag));
1865
snapid = strtoul(snapshot_id, NULL, 10);
1867
strncpy(tag, s->name, sizeof(tag));
1870
ret = find_vdi_name(s, vdi, snapid, tag, &vid, 1);
1872
error_report("Failed to find_vdi_name");
1877
fd = connect_to_sdog(s->addr, s->port);
1879
error_report("failed to connect");
1883
buf = g_malloc(SD_INODE_SIZE);
1884
ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies,
1894
memcpy(&s->inode, buf, sizeof(s->inode));
1896
if (!s->inode.vm_state_size) {
1897
error_report("Invalid snapshot");
1909
/* recover bdrv_sd_state */
1910
memcpy(s, old_s, sizeof(BDRVSheepdogState));
1914
error_report("failed to open. recover old bdrv_sd_state.");
1919
static int sd_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1921
/* FIXME: Delete specified snapshot id. */
1925
static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
1927
BDRVSheepdogState *s = bs->opaque;
1929
int fd, nr = 1024, ret, max = BITS_TO_LONGS(SD_NR_VDIS) * sizeof(long);
1930
QEMUSnapshotInfo *sn_tab = NULL;
1931
unsigned wlen, rlen;
1933
static SheepdogInode inode;
1934
unsigned long *vdi_inuse;
1935
unsigned int start_nr;
1939
vdi_inuse = g_malloc(max);
1941
fd = connect_to_sdog(s->addr, s->port);
1949
memset(&req, 0, sizeof(req));
1951
req.opcode = SD_OP_READ_VDIS;
1952
req.data_length = max;
1954
ret = do_req(fd, (SheepdogReq *)&req, vdi_inuse, &wlen, &rlen);
1961
sn_tab = g_malloc0(nr * sizeof(*sn_tab));
1963
/* calculate a vdi id with hash function */
1964
hval = fnv_64a_buf(s->name, strlen(s->name), FNV1A_64_INIT);
1965
start_nr = hval & (SD_NR_VDIS - 1);
1967
fd = connect_to_sdog(s->addr, s->port);
1969
error_report("failed to connect");
1973
for (vid = start_nr; found < nr; vid = (vid + 1) % SD_NR_VDIS) {
1974
if (!test_bit(vid, vdi_inuse)) {
1978
/* we don't need to read entire object */
1979
ret = read_object(fd, (char *)&inode, vid_to_vdi_oid(vid),
1980
0, SD_INODE_SIZE - sizeof(inode.data_vdi_id), 0);
1986
if (!strcmp(inode.name, s->name) && is_snapshot(&inode)) {
1987
sn_tab[found].date_sec = inode.snap_ctime >> 32;
1988
sn_tab[found].date_nsec = inode.snap_ctime & 0xffffffff;
1989
sn_tab[found].vm_state_size = inode.vm_state_size;
1990
sn_tab[found].vm_clock_nsec = inode.vm_clock_nsec;
1992
snprintf(sn_tab[found].id_str, sizeof(sn_tab[found].id_str), "%u",
1994
strncpy(sn_tab[found].name, inode.tag,
1995
MIN(sizeof(sn_tab[found].name), sizeof(inode.tag)));
2009
static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data,
2010
int64_t pos, int size, int load)
2014
unsigned int data_len;
2015
uint64_t vmstate_oid;
2019
fd = connect_to_sdog(s->addr, s->port);
2026
vdi_index = pos / SD_DATA_OBJ_SIZE;
2027
offset = pos % SD_DATA_OBJ_SIZE;
2029
data_len = MIN(size, SD_DATA_OBJ_SIZE);
2031
vmstate_oid = vid_to_vmstate_oid(s->inode.vdi_id, vdi_index);
2033
create = (offset == 0);
2035
ret = read_object(fd, (char *)data, vmstate_oid,
2036
s->inode.nr_copies, data_len, offset);
2038
ret = write_object(fd, (char *)data, vmstate_oid,
2039
s->inode.nr_copies, data_len, offset, create);
2043
error_report("failed to save vmstate %s", strerror(errno));
2057
static int sd_save_vmstate(BlockDriverState *bs, const uint8_t *data,
2058
int64_t pos, int size)
2060
BDRVSheepdogState *s = bs->opaque;
2062
return do_load_save_vmstate(s, (uint8_t *)data, pos, size, 0);
2065
static int sd_load_vmstate(BlockDriverState *bs, uint8_t *data,
2066
int64_t pos, int size)
2068
BDRVSheepdogState *s = bs->opaque;
2070
return do_load_save_vmstate(s, data, pos, size, 1);
2074
static QEMUOptionParameter sd_create_options[] = {
2076
.name = BLOCK_OPT_SIZE,
2078
.help = "Virtual disk size"
2081
.name = BLOCK_OPT_BACKING_FILE,
2083
.help = "File name of a base image"
2086
.name = BLOCK_OPT_PREALLOC,
2088
.help = "Preallocation mode (allowed values: off, full)"
2093
BlockDriver bdrv_sheepdog = {
2094
.format_name = "sheepdog",
2095
.protocol_name = "sheepdog",
2096
.instance_size = sizeof(BDRVSheepdogState),
2097
.bdrv_file_open = sd_open,
2098
.bdrv_close = sd_close,
2099
.bdrv_create = sd_create,
2100
.bdrv_getlength = sd_getlength,
2101
.bdrv_truncate = sd_truncate,
2103
.bdrv_co_readv = sd_co_readv,
2104
.bdrv_co_writev = sd_co_writev,
2106
.bdrv_snapshot_create = sd_snapshot_create,
2107
.bdrv_snapshot_goto = sd_snapshot_goto,
2108
.bdrv_snapshot_delete = sd_snapshot_delete,
2109
.bdrv_snapshot_list = sd_snapshot_list,
2111
.bdrv_save_vmstate = sd_save_vmstate,
2112
.bdrv_load_vmstate = sd_load_vmstate,
2114
.create_options = sd_create_options,
2117
static void bdrv_sheepdog_init(void)
2119
bdrv_register(&bdrv_sheepdog);
2121
block_init(bdrv_sheepdog_init);