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authorMarkus Armbruster <armbru@redhat.com>2021-05-01 09:57:47 +0200
committerMarkus Armbruster <armbru@redhat.com>2021-05-12 17:42:23 +0200
commit09ec85176e4095be15f233ebc870d5680123f024 (patch)
tree845f24ac9143c2602ba85a8cc24758741b75d5e1 /block/sheepdog.c
parent875bb7e35b78c609252187dc7bd68d90bf742da9 (diff)
block: Drop the sheepdog block driver
It was deprecated in commit e1c4269763, v5.2.0. See that commit message for rationale. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20210501075747.3293186-1-armbru@redhat.com> ACKed-by: Peter Krempa <pkrempa@redhat.com>
Diffstat (limited to 'block/sheepdog.c')
-rw-r--r--block/sheepdog.c3356
1 files changed, 0 insertions, 3356 deletions
diff --git a/block/sheepdog.c b/block/sheepdog.c
deleted file mode 100644
index a45c73826d..0000000000
--- a/block/sheepdog.c
+++ /dev/null
@@ -1,3356 +0,0 @@
-/*
- * Copyright (C) 2009-2010 Nippon Telegraph and Telephone Corporation.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/osdep.h"
-#include "qemu-common.h"
-#include "qapi/error.h"
-#include "qapi/qapi-visit-sockets.h"
-#include "qapi/qapi-visit-block-core.h"
-#include "qapi/qmp/qdict.h"
-#include "qapi/qobject-input-visitor.h"
-#include "qapi/qobject-output-visitor.h"
-#include "qemu/uri.h"
-#include "qemu/error-report.h"
-#include "qemu/main-loop.h"
-#include "qemu/module.h"
-#include "qemu/option.h"
-#include "qemu/sockets.h"
-#include "block/block_int.h"
-#include "block/qdict.h"
-#include "sysemu/block-backend.h"
-#include "qemu/bitops.h"
-#include "qemu/cutils.h"
-#include "trace.h"
-
-#define SD_PROTO_VER 0x01
-
-#define SD_DEFAULT_ADDR "localhost"
-#define SD_DEFAULT_PORT 7000
-
-#define SD_OP_CREATE_AND_WRITE_OBJ 0x01
-#define SD_OP_READ_OBJ 0x02
-#define SD_OP_WRITE_OBJ 0x03
-/* 0x04 is used internally by Sheepdog */
-
-#define SD_OP_NEW_VDI 0x11
-#define SD_OP_LOCK_VDI 0x12
-#define SD_OP_RELEASE_VDI 0x13
-#define SD_OP_GET_VDI_INFO 0x14
-#define SD_OP_READ_VDIS 0x15
-#define SD_OP_FLUSH_VDI 0x16
-#define SD_OP_DEL_VDI 0x17
-#define SD_OP_GET_CLUSTER_DEFAULT 0x18
-
-#define SD_FLAG_CMD_WRITE 0x01
-#define SD_FLAG_CMD_COW 0x02
-#define SD_FLAG_CMD_CACHE 0x04 /* Writeback mode for cache */
-#define SD_FLAG_CMD_DIRECT 0x08 /* Don't use cache */
-
-#define SD_RES_SUCCESS 0x00 /* Success */
-#define SD_RES_UNKNOWN 0x01 /* Unknown error */
-#define SD_RES_NO_OBJ 0x02 /* No object found */
-#define SD_RES_EIO 0x03 /* I/O error */
-#define SD_RES_VDI_EXIST 0x04 /* Vdi exists already */
-#define SD_RES_INVALID_PARMS 0x05 /* Invalid parameters */
-#define SD_RES_SYSTEM_ERROR 0x06 /* System error */
-#define SD_RES_VDI_LOCKED 0x07 /* Vdi is locked */
-#define SD_RES_NO_VDI 0x08 /* No vdi found */
-#define SD_RES_NO_BASE_VDI 0x09 /* No base vdi found */
-#define SD_RES_VDI_READ 0x0A /* Cannot read requested vdi */
-#define SD_RES_VDI_WRITE 0x0B /* Cannot write requested vdi */
-#define SD_RES_BASE_VDI_READ 0x0C /* Cannot read base vdi */
-#define SD_RES_BASE_VDI_WRITE 0x0D /* Cannot write base vdi */
-#define SD_RES_NO_TAG 0x0E /* Requested tag is not found */
-#define SD_RES_STARTUP 0x0F /* Sheepdog is on starting up */
-#define SD_RES_VDI_NOT_LOCKED 0x10 /* Vdi is not locked */
-#define SD_RES_SHUTDOWN 0x11 /* Sheepdog is shutting down */
-#define SD_RES_NO_MEM 0x12 /* Cannot allocate memory */
-#define SD_RES_FULL_VDI 0x13 /* we already have the maximum vdis */
-#define SD_RES_VER_MISMATCH 0x14 /* Protocol version mismatch */
-#define SD_RES_NO_SPACE 0x15 /* Server has no room for new objects */
-#define SD_RES_WAIT_FOR_FORMAT 0x16 /* Waiting for a format operation */
-#define SD_RES_WAIT_FOR_JOIN 0x17 /* Waiting for other nodes joining */
-#define SD_RES_JOIN_FAILED 0x18 /* Target node had failed to join sheepdog */
-#define SD_RES_HALT 0x19 /* Sheepdog is stopped serving IO request */
-#define SD_RES_READONLY 0x1A /* Object is read-only */
-
-/*
- * Object ID rules
- *
- * 0 - 19 (20 bits): data object space
- * 20 - 31 (12 bits): reserved data object space
- * 32 - 55 (24 bits): vdi object space
- * 56 - 59 ( 4 bits): reserved vdi object space
- * 60 - 63 ( 4 bits): object type identifier space
- */
-
-#define VDI_SPACE_SHIFT 32
-#define VDI_BIT (UINT64_C(1) << 63)
-#define VMSTATE_BIT (UINT64_C(1) << 62)
-#define MAX_DATA_OBJS (UINT64_C(1) << 20)
-#define MAX_CHILDREN 1024
-#define SD_MAX_VDI_LEN 256
-#define SD_MAX_VDI_TAG_LEN 256
-#define SD_NR_VDIS (1U << 24)
-#define SD_DATA_OBJ_SIZE (UINT64_C(1) << 22)
-#define SD_MAX_VDI_SIZE (SD_DATA_OBJ_SIZE * MAX_DATA_OBJS)
-#define SD_DEFAULT_BLOCK_SIZE_SHIFT 22
-/*
- * For erasure coding, we use at most SD_EC_MAX_STRIP for data strips and
- * (SD_EC_MAX_STRIP - 1) for parity strips
- *
- * SD_MAX_COPIES is sum of number of data strips and parity strips.
- */
-#define SD_EC_MAX_STRIP 16
-#define SD_MAX_COPIES (SD_EC_MAX_STRIP * 2 - 1)
-
-#define SD_INODE_SIZE (sizeof(SheepdogInode))
-#define CURRENT_VDI_ID 0
-
-#define LOCK_TYPE_NORMAL 0
-#define LOCK_TYPE_SHARED 1 /* for iSCSI multipath */
-
-typedef struct SheepdogReq {
- uint8_t proto_ver;
- uint8_t opcode;
- uint16_t flags;
- uint32_t epoch;
- uint32_t id;
- uint32_t data_length;
- uint32_t opcode_specific[8];
-} SheepdogReq;
-
-typedef struct SheepdogRsp {
- uint8_t proto_ver;
- uint8_t opcode;
- uint16_t flags;
- uint32_t epoch;
- uint32_t id;
- uint32_t data_length;
- uint32_t result;
- uint32_t opcode_specific[7];
-} SheepdogRsp;
-
-typedef struct SheepdogObjReq {
- uint8_t proto_ver;
- uint8_t opcode;
- uint16_t flags;
- uint32_t epoch;
- uint32_t id;
- uint32_t data_length;
- uint64_t oid;
- uint64_t cow_oid;
- uint8_t copies;
- uint8_t copy_policy;
- uint8_t reserved[6];
- uint64_t offset;
-} SheepdogObjReq;
-
-typedef struct SheepdogObjRsp {
- uint8_t proto_ver;
- uint8_t opcode;
- uint16_t flags;
- uint32_t epoch;
- uint32_t id;
- uint32_t data_length;
- uint32_t result;
- uint8_t copies;
- uint8_t copy_policy;
- uint8_t reserved[2];
- uint32_t pad[6];
-} SheepdogObjRsp;
-
-typedef struct SheepdogVdiReq {
- uint8_t proto_ver;
- uint8_t opcode;
- uint16_t flags;
- uint32_t epoch;
- uint32_t id;
- uint32_t data_length;
- uint64_t vdi_size;
- uint32_t base_vdi_id;
- uint8_t copies;
- uint8_t copy_policy;
- uint8_t store_policy;
- uint8_t block_size_shift;
- uint32_t snapid;
- uint32_t type;
- uint32_t pad[2];
-} SheepdogVdiReq;
-
-typedef struct SheepdogVdiRsp {
- uint8_t proto_ver;
- uint8_t opcode;
- uint16_t flags;
- uint32_t epoch;
- uint32_t id;
- uint32_t data_length;
- uint32_t result;
- uint32_t rsvd;
- uint32_t vdi_id;
- uint32_t pad[5];
-} SheepdogVdiRsp;
-
-typedef struct SheepdogClusterRsp {
- uint8_t proto_ver;
- uint8_t opcode;
- uint16_t flags;
- uint32_t epoch;
- uint32_t id;
- uint32_t data_length;
- uint32_t result;
- uint8_t nr_copies;
- uint8_t copy_policy;
- uint8_t block_size_shift;
- uint8_t __pad1;
- uint32_t __pad2[6];
-} SheepdogClusterRsp;
-
-typedef struct SheepdogInode {
- char name[SD_MAX_VDI_LEN];
- char tag[SD_MAX_VDI_TAG_LEN];
- uint64_t ctime;
- uint64_t snap_ctime;
- uint64_t vm_clock_nsec;
- uint64_t vdi_size;
- uint64_t vm_state_size;
- uint16_t copy_policy;
- uint8_t nr_copies;
- uint8_t block_size_shift;
- uint32_t snap_id;
- uint32_t vdi_id;
- uint32_t parent_vdi_id;
- uint32_t child_vdi_id[MAX_CHILDREN];
- uint32_t data_vdi_id[MAX_DATA_OBJS];
-} SheepdogInode;
-
-#define SD_INODE_HEADER_SIZE offsetof(SheepdogInode, data_vdi_id)
-
-/*
- * 64 bit FNV-1a non-zero initial basis
- */
-#define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL)
-
-static void deprecation_warning(void)
-{
- static bool warned;
-
- if (!warned) {
- warn_report("the sheepdog block driver is deprecated");
- warned = true;
- }
-}
-
-/*
- * 64 bit Fowler/Noll/Vo FNV-1a hash code
- */
-static inline uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval)
-{
- unsigned char *bp = buf;
- unsigned char *be = bp + len;
- while (bp < be) {
- hval ^= (uint64_t) *bp++;
- hval += (hval << 1) + (hval << 4) + (hval << 5) +
- (hval << 7) + (hval << 8) + (hval << 40);
- }
- return hval;
-}
-
-static inline bool is_data_obj_writable(SheepdogInode *inode, unsigned int idx)
-{
- return inode->vdi_id == inode->data_vdi_id[idx];
-}
-
-static inline bool is_data_obj(uint64_t oid)
-{
- return !(VDI_BIT & oid);
-}
-
-static inline uint64_t data_oid_to_idx(uint64_t oid)
-{
- return oid & (MAX_DATA_OBJS - 1);
-}
-
-static inline uint32_t oid_to_vid(uint64_t oid)
-{
- return (oid & ~VDI_BIT) >> VDI_SPACE_SHIFT;
-}
-
-static inline uint64_t vid_to_vdi_oid(uint32_t vid)
-{
- return VDI_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT);
-}
-
-static inline uint64_t vid_to_vmstate_oid(uint32_t vid, uint32_t idx)
-{
- return VMSTATE_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT) | idx;
-}
-
-static inline uint64_t vid_to_data_oid(uint32_t vid, uint32_t idx)
-{
- return ((uint64_t)vid << VDI_SPACE_SHIFT) | idx;
-}
-
-static inline bool is_snapshot(struct SheepdogInode *inode)
-{
- return !!inode->snap_ctime;
-}
-
-static inline size_t count_data_objs(const struct SheepdogInode *inode)
-{
- return DIV_ROUND_UP(inode->vdi_size,
- (1UL << inode->block_size_shift));
-}
-
-typedef struct SheepdogAIOCB SheepdogAIOCB;
-typedef struct BDRVSheepdogState BDRVSheepdogState;
-
-typedef struct AIOReq {
- SheepdogAIOCB *aiocb;
- unsigned int iov_offset;
-
- uint64_t oid;
- uint64_t base_oid;
- uint64_t offset;
- unsigned int data_len;
- uint8_t flags;
- uint32_t id;
- bool create;
-
- QLIST_ENTRY(AIOReq) aio_siblings;
-} AIOReq;
-
-enum AIOCBState {
- AIOCB_WRITE_UDATA,
- AIOCB_READ_UDATA,
- AIOCB_FLUSH_CACHE,
- AIOCB_DISCARD_OBJ,
-};
-
-#define AIOCBOverlapping(x, y) \
- (!(x->max_affect_data_idx < y->min_affect_data_idx \
- || y->max_affect_data_idx < x->min_affect_data_idx))
-
-struct SheepdogAIOCB {
- BDRVSheepdogState *s;
-
- QEMUIOVector *qiov;
-
- int64_t sector_num;
- int nb_sectors;
-
- int ret;
- enum AIOCBState aiocb_type;
-
- Coroutine *coroutine;
- int nr_pending;
-
- uint32_t min_affect_data_idx;
- uint32_t max_affect_data_idx;
-
- /*
- * The difference between affect_data_idx and dirty_data_idx:
- * affect_data_idx represents range of index of all request types.
- * dirty_data_idx represents range of index updated by COW requests.
- * dirty_data_idx is used for updating an inode object.
- */
- uint32_t min_dirty_data_idx;
- uint32_t max_dirty_data_idx;
-
- QLIST_ENTRY(SheepdogAIOCB) aiocb_siblings;
-};
-
-struct BDRVSheepdogState {
- BlockDriverState *bs;
- AioContext *aio_context;
-
- SheepdogInode inode;
-
- char name[SD_MAX_VDI_LEN];
- bool is_snapshot;
- uint32_t cache_flags;
- bool discard_supported;
-
- SocketAddress *addr;
- int fd;
-
- CoMutex lock;
- Coroutine *co_send;
- Coroutine *co_recv;
-
- uint32_t aioreq_seq_num;
-
- /* Every aio request must be linked to either of these queues. */
- QLIST_HEAD(, AIOReq) inflight_aio_head;
- QLIST_HEAD(, AIOReq) failed_aio_head;
-
- CoMutex queue_lock;
- CoQueue overlapping_queue;
- QLIST_HEAD(, SheepdogAIOCB) inflight_aiocb_head;
-};
-
-typedef struct BDRVSheepdogReopenState {
- int fd;
- int cache_flags;
-} BDRVSheepdogReopenState;
-
-static const char *sd_strerror(int err)
-{
- int i;
-
- static const struct {
- int err;
- const char *desc;
- } errors[] = {
- {SD_RES_SUCCESS, "Success"},
- {SD_RES_UNKNOWN, "Unknown error"},
- {SD_RES_NO_OBJ, "No object found"},
- {SD_RES_EIO, "I/O error"},
- {SD_RES_VDI_EXIST, "VDI exists already"},
- {SD_RES_INVALID_PARMS, "Invalid parameters"},
- {SD_RES_SYSTEM_ERROR, "System error"},
- {SD_RES_VDI_LOCKED, "VDI is already locked"},
- {SD_RES_NO_VDI, "No vdi found"},
- {SD_RES_NO_BASE_VDI, "No base VDI found"},
- {SD_RES_VDI_READ, "Failed read the requested VDI"},
- {SD_RES_VDI_WRITE, "Failed to write the requested VDI"},
- {SD_RES_BASE_VDI_READ, "Failed to read the base VDI"},
- {SD_RES_BASE_VDI_WRITE, "Failed to write the base VDI"},
- {SD_RES_NO_TAG, "Failed to find the requested tag"},
- {SD_RES_STARTUP, "The system is still booting"},
- {SD_RES_VDI_NOT_LOCKED, "VDI isn't locked"},
- {SD_RES_SHUTDOWN, "The system is shutting down"},
- {SD_RES_NO_MEM, "Out of memory on the server"},
- {SD_RES_FULL_VDI, "We already have the maximum vdis"},
- {SD_RES_VER_MISMATCH, "Protocol version mismatch"},
- {SD_RES_NO_SPACE, "Server has no space for new objects"},
- {SD_RES_WAIT_FOR_FORMAT, "Sheepdog is waiting for a format operation"},
- {SD_RES_WAIT_FOR_JOIN, "Sheepdog is waiting for other nodes joining"},
- {SD_RES_JOIN_FAILED, "Target node had failed to join sheepdog"},
- {SD_RES_HALT, "Sheepdog is stopped serving IO request"},
- {SD_RES_READONLY, "Object is read-only"},
- };
-
- for (i = 0; i < ARRAY_SIZE(errors); ++i) {
- if (errors[i].err == err) {
- return errors[i].desc;
- }
- }
-
- return "Invalid error code";
-}
-
-/*
- * Sheepdog I/O handling:
- *
- * 1. In sd_co_rw_vector, we send the I/O requests to the server and
- * link the requests to the inflight_list in the
- * BDRVSheepdogState. The function yields while waiting for
- * receiving the response.
- *
- * 2. We receive the response in aio_read_response, the fd handler to
- * the sheepdog connection. We switch back to sd_co_readv/sd_writev
- * after all the requests belonging to the AIOCB are finished. If
- * needed, sd_co_writev will send another requests for the vdi object.
- */
-
-static inline AIOReq *alloc_aio_req(BDRVSheepdogState *s, SheepdogAIOCB *acb,
- uint64_t oid, unsigned int data_len,
- uint64_t offset, uint8_t flags, bool create,
- uint64_t base_oid, unsigned int iov_offset)
-{
- 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_server_config(QDict *options, Error **errp)
-{
- QDict *server = NULL;
- Visitor *iv = NULL;
- SocketAddress *saddr = NULL;
-
- qdict_extract_subqdict(options, &server, "server.");
-
- iv = qobject_input_visitor_new_flat_confused(server, errp);
- if (!iv) {
- goto done;
- }
-
- if (!visit_type_SocketAddress(iv, NULL, &saddr, errp)) {
- goto done;
- }
-
-done:
- visit_free(iv);
- qobject_unref(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, errp);
-
- if (s->addr->type == SOCKET_ADDRESS_TYPE_INET && fd >= 0) {
- int ret = socket_set_nodelay(fd);
- if (ret < 0) {
- warn_report("can't set TCP_NODELAY: %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. */
- qatomic_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) {
- trace_sheepdog_reconnect_to_sdog();
- error_report_err(local_err);
- qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, NANOSECONDS_PER_SECOND);
- }
- };
-
- /*
- * 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) {
- trace_sheepdog_aio_read_response();
- 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 '%s'", filename);
- 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] QEMU_NONSTRING;
-
- 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;
-
- deprecation_warning();
-
- s->bs = bs;
- s->aio_context = bdrv_get_aio_context(bs);
-
- opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
- if (!qemu_opts_absorb_qdict(opts, options, errp)) {
- 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 (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]) {
- trace_sheepdog_open(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;
- bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
- 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(BlockDriverState *bs, int64_t old_size, int64_t new_size,
- Error **errp)
-{
- BlockBackend *blk = NULL;
- BDRVSheepdogState *base = bs->opaque;
- unsigned long buf_size;
- uint32_t idx, max_idx;
- uint32_t object_size;
- void *buf = NULL;
- int ret;
-
- blk = blk_new_with_bs(bs,
- BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | BLK_PERM_RESIZE,
- BLK_PERM_ALL, errp);
-
- if (!blk) {
- ret = -EPERM;
- goto out_with_err_set;
- }
-
- blk_set_allow_write_beyond_eof(blk, true);
-
- 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(new_size, buf_size);
-
- for (idx = old_size / buf_size; 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:
- blk_unref(blk);
- g_free(buf);
-
- return ret;
-}
-
-static int sd_create_prealloc(BlockdevOptionsSheepdog *location, int64_t size,
- Error **errp)
-{
- BlockDriverState *bs;
- Visitor *v;
- QObject *obj = NULL;
- QDict *qdict;
- int ret;
-
- v = qobject_output_visitor_new(&obj);
- visit_type_BlockdevOptionsSheepdog(v, NULL, &location, &error_abort);
- visit_free(v);
-
- qdict = qobject_to(QDict, obj);
- qdict_flatten(qdict);
-
- qdict_put_str(qdict, "driver", "sheepdog");
-
- bs = bdrv_open(NULL, NULL, qdict, BDRV_O_PROTOCOL | BDRV_O_RDWR, errp);
- if (bs == NULL) {
- ret = -EIO;
- goto fail;
- }
-
- ret = sd_prealloc(bs, 0, size, errp);
-fail:
- bdrv_unref(bs);
- qobject_unref(qdict);
- return ret;
-}
-
-static int parse_redundancy(BDRVSheepdogState *s, SheepdogRedundancy *opt)
-{
- struct SheepdogInode *inode = &s->inode;
-
- switch (opt->type) {
- case SHEEPDOG_REDUNDANCY_TYPE_FULL:
- if (opt->u.full.copies > SD_MAX_COPIES || opt->u.full.copies < 1) {
- return -EINVAL;
- }
- inode->copy_policy = 0;
- inode->nr_copies = opt->u.full.copies;
- return 0;
-
- case SHEEPDOG_REDUNDANCY_TYPE_ERASURE_CODED:
- {
- int64_t copy = opt->u.erasure_coded.data_strips;
- int64_t parity = opt->u.erasure_coded.parity_strips;
-
- if (copy != 2 && copy != 4 && copy != 8 && copy != 16) {
- return -EINVAL;
- }
-
- 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;
- }
-
- default:
- g_assert_not_reached();
- }
-
- return -EINVAL;
-}
-
-/*
- * 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 SheepdogRedundancy *parse_redundancy_str(const char *opt)
-{
- SheepdogRedundancy *redundancy;
- const char *n1, *n2;
- long copy, parity;
- char p[10];
- int ret;
-
- pstrcpy(p, sizeof(p), opt);
- n1 = strtok(p, ":");
- n2 = strtok(NULL, ":");
-
- if (!n1) {
- return NULL;
- }
-
- ret = qemu_strtol(n1, NULL, 10, &copy);
- if (ret < 0) {
- return NULL;
- }
-
- redundancy = g_new0(SheepdogRedundancy, 1);
- if (!n2) {
- *redundancy = (SheepdogRedundancy) {
- .type = SHEEPDOG_REDUNDANCY_TYPE_FULL,
- .u.full.copies = copy,
- };
- } else {
- ret = qemu_strtol(n2, NULL, 10, &parity);
- if (ret < 0) {
- g_free(redundancy);
- return NULL;
- }
-
- *redundancy = (SheepdogRedundancy) {
- .type = SHEEPDOG_REDUNDANCY_TYPE_ERASURE_CODED,
- .u.erasure_coded = {
- .data_strips = copy,
- .parity_strips = parity,
- },
- };
- }
-
- return redundancy;
-}
-
-static int parse_block_size_shift(BDRVSheepdogState *s,
- BlockdevCreateOptionsSheepdog *opts)
-{
- struct SheepdogInode *inode = &s->inode;
- uint64_t object_size;
- int obj_order;
-
- if (opts->has_object_size) {
- object_size = opts->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_co_create(BlockdevCreateOptions *options, Error **errp)
-{
- BlockdevCreateOptionsSheepdog *opts = &options->u.sheepdog;
- int ret = 0;
- uint32_t vid = 0;
- char *backing_file = NULL;
- char *buf = NULL;
- BDRVSheepdogState *s;
- uint64_t max_vdi_size;
- bool prealloc = false;
-
- assert(options->driver == BLOCKDEV_DRIVER_SHEEPDOG);
-
- deprecation_warning();
-
- s = g_new0(BDRVSheepdogState, 1);
-
- /* Steal SocketAddress from QAPI, set NULL to prevent double free */
- s->addr = opts->location->server;
- opts->location->server = NULL;
-
- if (strlen(opts->location->vdi) >= sizeof(s->name)) {
- error_setg(errp, "'vdi' string too long");
- ret = -EINVAL;
- goto out;
- }
- pstrcpy(s->name, sizeof(s->name), opts->location->vdi);
-
- s->inode.vdi_size = opts->size;
- backing_file = opts->backing_file;
-
- if (!opts->has_preallocation) {
- opts->preallocation = PREALLOC_MODE_OFF;
- }
- switch (opts->preallocation) {
- case PREALLOC_MODE_OFF:
- prealloc = false;
- break;
- case PREALLOC_MODE_FULL:
- prealloc = true;
- break;
- default:
- error_setg(errp, "Preallocation mode not supported for Sheepdog");
- ret = -EINVAL;
- goto out;
- }
-
- if (opts->has_redundancy) {
- ret = parse_redundancy(s, opts->redundancy);
- if (ret < 0) {
- error_setg(errp, "Invalid redundancy mode");
- 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 (opts->has_backing_file) {
- BlockBackend *blk;
- BDRVSheepdogState *base;
- BlockDriver *drv;
-
- /* Currently, only Sheepdog backing image is supported. */
- drv = bdrv_find_protocol(opts->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(opts->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_create_prealloc(opts->location, opts->size, errp);
- }
-out:
- g_free(backing_file);
- g_free(buf);
- g_free(s->addr);
- g_free(s);
- return ret;
-}
-
-static int coroutine_fn sd_co_create_opts(BlockDriver *drv,
- const char *filename,
- QemuOpts *opts,
- Error **errp)
-{
- BlockdevCreateOptions *create_options = NULL;
- QDict *qdict = NULL, *location_qdict;
- Visitor *v;
- char *redundancy = NULL;
- Error *local_err = NULL;
- int ret;
- char *backing_fmt = NULL;
-
- redundancy = qemu_opt_get_del(opts, BLOCK_OPT_REDUNDANCY);
- backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
-
- if (backing_fmt && strcmp(backing_fmt, "sheepdog") != 0) {
- error_setg(errp, "backing_file must be a sheepdog image");
- ret = -EINVAL;
- goto fail;
- }
-
- qdict = qemu_opts_to_qdict(opts, NULL);
- qdict_put_str(qdict, "driver", "sheepdog");
-
- location_qdict = qdict_new();
- qdict_put(qdict, "location", location_qdict);
-
- sd_parse_filename(filename, location_qdict, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- ret = -EINVAL;
- goto fail;
- }
-
- qdict_flatten(qdict);
-
- /* Change legacy command line options into QMP ones */
- static const QDictRenames opt_renames[] = {
- { BLOCK_OPT_BACKING_FILE, "backing-file" },
- { BLOCK_OPT_OBJECT_SIZE, "object-size" },
- { NULL, NULL },
- };
-
- if (!qdict_rename_keys(qdict, opt_renames, errp)) {
- ret = -EINVAL;
- goto fail;
- }
-
- /* Get the QAPI object */
- v = qobject_input_visitor_new_flat_confused(qdict, errp);
- if (!v) {
- ret = -EINVAL;
- goto fail;
- }
-
- visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp);
- visit_free(v);
- if (!create_options) {
- ret = -EINVAL;
- goto fail;
- }
-
- assert(create_options->driver == BLOCKDEV_DRIVER_SHEEPDOG);
- create_options->u.sheepdog.size =
- ROUND_UP(create_options->u.sheepdog.size, BDRV_SECTOR_SIZE);
-
- if (redundancy) {
- create_options->u.sheepdog.has_redundancy = true;
- create_options->u.sheepdog.redundancy =
- parse_redundancy_str(redundancy);
- if (create_options->u.sheepdog.redundancy == NULL) {
- error_setg(errp, "Invalid redundancy mode");
- ret = -EINVAL;
- goto fail;
- }
- }
-
- ret = sd_co_create(create_options, errp);
-fail:
- qapi_free_BlockdevCreateOptions(create_options);
- qobject_unref(qdict);
- g_free(redundancy);
- g_free(backing_fmt);
- 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;
-
- trace_sheepdog_close(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 coroutine_fn sd_co_truncate(BlockDriverState *bs, int64_t offset,
- bool exact, PreallocMode prealloc,
- BdrvRequestFlags flags, Error **errp)
-{
- BDRVSheepdogState *s = bs->opaque;
- int ret, fd;
- unsigned int datalen;
- uint64_t max_vdi_size;
- int64_t old_size = s->inode.vdi_size;
-
- if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_FULL) {
- error_setg(errp, "Unsupported preallocation mode '%s'",
- PreallocMode_str(prealloc));
- return -ENOTSUP;
- }
-
- max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS;
- if (offset < old_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_HEADER_SIZE;
- 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;
- }
-
- if (prealloc == PREALLOC_MODE_FULL) {
- ret = sd_prealloc(bs, old_size, offset, errp);
- if (ret < 0) {
- return ret;
- }
- }
-
- return 0;
-}
-
-/*
- * This function is called after writing data objects. If we need to
- * update metadata, this sends a write request to the vdi object.
- */
-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;
-
- trace_sheepdog_create_branch_snapshot(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;
- }
-
- trace_sheepdog_create_branch_created(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;
- trace_sheepdog_create_branch_new(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) {
- trace_sheepdog_co_rw_vector_update(inode->vdi_id, oid,
- vid_to_data_oid(inode->data_vdi_id[idx], idx),
- idx);
- oid = vid_to_data_oid(inode->vdi_id, idx);
- trace_sheepdog_co_rw_vector_new(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,
- int flags)
-{
- SheepdogAIOCB acb;
- int ret;
- int64_t offset = (sector_num + nb_sectors) * BDRV_SECTOR_SIZE;
- BDRVSheepdogState *s = bs->opaque;
-
- assert(!flags);
- if (offset > s->inode.vdi_size) {
- ret = sd_co_truncate(bs, offset, false, PREALLOC_MODE_OFF, 0, 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;
-
- trace_sheepdog_snapshot_create_info(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;
- }
-
- trace_sheepdog_snapshot_create(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_HEADER_SIZE;
- 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);
- trace_sheepdog_snapshot_create_inode(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;
- SheepdogInode *inode;
- unsigned long *vdi_inuse;
- unsigned int start_nr;
- uint64_t hval;
- uint32_t vid;
-
- vdi_inuse = g_malloc(max);
- inode = g_malloc(SD_INODE_HEADER_SIZE);
-
- 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_HEADER_SIZE, 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);
- g_free(inode);
-
- 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 int
-sd_co_block_status(BlockDriverState *bs, bool want_zero, int64_t offset,
- int64_t bytes, int64_t *pnum, int64_t *map,
- BlockDriverState **file)
-{
- BDRVSheepdogState *s = bs->opaque;
- SheepdogInode *inode = &s->inode;
- uint32_t object_size = (UINT32_C(1) << inode->block_size_shift);
- unsigned long start = offset / object_size,
- end = DIV_ROUND_UP(offset + bytes, object_size);
- unsigned long idx;
- *map = offset;
- int ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
-
- 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;
- if (*pnum > bytes) {
- *pnum = bytes;
- }
- 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_BACKING_FMT,
- .type = QEMU_OPT_STRING,
- .help = "Must be 'sheepdog' if present",
- },
- {
- .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 const char *const sd_strong_runtime_opts[] = {
- "vdi",
- "snap-id",
- "tag",
- "server.",
-
- NULL
-};
-
-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_co_create = sd_co_create,
- .bdrv_co_create_opts = sd_co_create_opts,
- .bdrv_has_zero_init = bdrv_has_zero_init_1,
- .bdrv_getlength = sd_getlength,
- .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
- .bdrv_co_truncate = sd_co_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_block_status = sd_co_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,
- .strong_runtime_opts = sd_strong_runtime_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_co_create = sd_co_create,
- .bdrv_co_create_opts = sd_co_create_opts,
- .bdrv_has_zero_init = bdrv_has_zero_init_1,
- .bdrv_getlength = sd_getlength,
- .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
- .bdrv_co_truncate = sd_co_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_block_status = sd_co_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,
- .strong_runtime_opts = sd_strong_runtime_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_co_create = sd_co_create,
- .bdrv_co_create_opts = sd_co_create_opts,
- .bdrv_has_zero_init = bdrv_has_zero_init_1,
- .bdrv_getlength = sd_getlength,
- .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
- .bdrv_co_truncate = sd_co_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_block_status = sd_co_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,
- .strong_runtime_opts = sd_strong_runtime_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);
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-04 00:15:53 +0000