On Mon, 2 Aug 2010, Christian Brunner wrote: > After the release of ceph 0.21 I felt it was about time to re-submit > the qemu block driver for ceph: > > This is an updated block driver for the distributed file system Ceph > (http://ceph.newdream.net/). This driver uses librados (which > is part of the Ceph server) for direct access to the Ceph object > store and is running entirely in userspace. > > It now has (read only) snapshot support and passes all relevant > qemu-iotests. > > To compile the driver you need at least ceph 0.21. > > Additional information is available on the Ceph-Wiki: > > http://ceph.newdream.net/wiki/Kvm-rbd > > The patch is based on git://repo.or.cz/qemu/kevin.git block Thare are whitespace issues in this patch. > > Signed-off-by: Christian Brunner <chb@xxxxxx> > > --- > Makefile.objs | 1 + > block/rbd.c | 907 +++++++++++++++++++++++++++++++++++++++++++++++++++++ > block/rbd_types.h | 71 +++++ > configure | 31 ++ > 4 files changed, 1010 insertions(+), 0 deletions(-) > create mode 100644 block/rbd.c > create mode 100644 block/rbd_types.h > > diff --git a/Makefile.objs b/Makefile.objs > index 4a1eaa1..bf45142 100644 > --- a/Makefile.objs > +++ b/Makefile.objs > @@ -18,6 +18,7 @@ block-nested-y += parallels.o nbd.o blkdebug.o sheepdog.o > block-nested-$(CONFIG_WIN32) += raw-win32.o > block-nested-$(CONFIG_POSIX) += raw-posix.o > block-nested-$(CONFIG_CURL) += curl.o > +block-nested-$(CONFIG_RBD) += rbd.o > > block-obj-y += $(addprefix block/, $(block-nested-y)) > > diff --git a/block/rbd.c b/block/rbd.c > new file mode 100644 > index 0000000..6f8ff15 > --- /dev/null > +++ b/block/rbd.c > @@ -0,0 +1,907 @@ > +/* > + * QEMU Block driver for RADOS (Ceph) > + * > + * Copyright (C) 2010 Christian Brunner <chb@xxxxxx> > + * > + * This work is licensed under the terms of the GNU GPL, version 2. See > + * the COPYING file in the top-level directory. > + * > + */ > + > +#include "qemu-common.h" > +#include "qemu-error.h" > +#include <sys/types.h> > +#include <stdbool.h> > + > +#include <qemu-common.h> > + > +#include "rbd_types.h" > +#include "module.h" > +#include "block_int.h" > + > +#include <stdio.h> > +#include <stdlib.h> > +#include <rados/librados.h> > + > +#include <signal.h> > + > + > +int eventfd(unsigned int initval, int flags); > + > + > +/* > + * When specifying the image filename use: > + * > + * rbd:poolname/devicename > + * > + * poolname must be the name of an existing rados pool > + * > + * devicename is the basename for all objects used to > + * emulate the raw device. > + * > + * Metadata information (image size, ...) is stored in an > + * object with the name "devicename.rbd". > + * > + * The raw device is split into 4MB sized objects by default. > + * The sequencenumber is encoded in a 12 byte long hex-string, > + * and is attached to the devicename, separated by a dot. > + * e.g. "devicename.1234567890ab" > + * > + */ > + > +#define OBJ_MAX_SIZE (1UL << OBJ_DEFAULT_OBJ_ORDER) > + > +typedef struct RBDAIOCB { > + BlockDriverAIOCB common; > + QEMUBH *bh; > + int ret; > + QEMUIOVector *qiov; > + char *bounce; > + int write; > + int64_t sector_num; > + int aiocnt; > + int error; > + struct BDRVRBDState *s; > +} RBDAIOCB; > + > +typedef struct RADOSCB { > + int rcbid; > + RBDAIOCB *acb; > + int done; > + int64_t segsize; > + char *buf; > +} RADOSCB; > + > +typedef struct BDRVRBDState { > + int efd; > + rados_pool_t pool; > + rados_pool_t header_pool; > + char name[RBD_MAX_OBJ_NAME_SIZE]; > + char block_name[RBD_MAX_BLOCK_NAME_SIZE]; > + uint64_t size; > + uint64_t objsize; > + int qemu_aio_count; > + int read_only; > +} BDRVRBDState; > + > +typedef struct rbd_obj_header_ondisk RbdHeader1; > + > +static int rbd_parsename(const char *filename, char *pool, char **snap, > + char *name) > +{ > + const char *rbdname; > + char *p; > + int l; > + > + if (!strstart(filename, "rbd:", &rbdname)) { > + return -EINVAL; > + } > + > + pstrcpy(pool, 2 * RBD_MAX_SEG_NAME_SIZE, rbdname); > + p = strchr(pool, '/'); > + if (p == NULL) { > + return -EINVAL; > + } > + > + *p = '\0'; > + > + l = strlen(pool); > + if(l >= RBD_MAX_SEG_NAME_SIZE) { > + error_report("pool name to long"); > + return -EINVAL; > + } else if (l <= 0) { > + error_report("pool name to short"); > + return -EINVAL; > + } > + > + l = strlen(++p); > + if (l >= RBD_MAX_OBJ_NAME_SIZE) { > + error_report("object name to long"); > + return -EINVAL; > + } else if (l <= 0) { > + error_report("object name to short"); > + return -EINVAL; > + } > + > + strcpy(name, p); > + > + *snap = strchr(name, '@'); > + if (*snap) { Inconsistent indentation > + *(*snap) = '\0'; > + (*snap)++; > + if (!*snap) *snap = NULL; > + } > + > + return l; > +} > + > +static int create_tmap_op(uint8_t op, const char *name, char **tmap_desc) > +{ > + uint32_t len = strlen(name); > + /* total_len = encoding op + name + empty buffer */ > + uint32_t total_len = 1 + (sizeof(uint32_t) + len) + sizeof(uint32_t); > + char *desc = NULL; > + > + desc = qemu_malloc(total_len); > + > + *tmap_desc = desc; > + > + *desc = op; > + desc++; > + memcpy(desc, &len, sizeof(len)); > + desc += sizeof(len); > + memcpy(desc, name, len); > + desc += len; > + len = 0; > + memcpy(desc, &len, sizeof(len)); > + desc += sizeof(len); > + > + return desc - *tmap_desc; > +} > + > +static void free_tmap_op(char *tmap_desc) > +{ > + qemu_free(tmap_desc); > +} > + > +static int rbd_register_image(rados_pool_t pool, const char *name) > +{ > + char *tmap_desc; > + const char *dir = RBD_DIRECTORY; > + int ret; > + > + ret = create_tmap_op(CEPH_OSD_TMAP_SET, name, &tmap_desc); > + if (ret < 0) { > + return ret; > + } > + > + ret = rados_tmap_update(pool, dir, tmap_desc, ret); > + free_tmap_op(tmap_desc); > + > + return ret; > +} > + > +static int touch_rbd_info(rados_pool_t pool, const char *info_oid) > +{ > + int r = rados_write(pool, info_oid, 0, NULL, 0); > + if (r < 0) { > + return r; > + } > + return 0; > +} > + > +static int rbd_assign_bid(rados_pool_t pool, uint64_t *id) > +{ > + uint64_t out[1]; > + const char *info_oid = RBD_INFO; > + > + *id = 0; > + > + int r = touch_rbd_info(pool, info_oid); > + if (r < 0) { > + return r; > + } > + > + r = rados_exec(pool, info_oid, "rbd", "assign_bid", NULL, > + 0, (char *)out, sizeof(out)); > + if (r < 0) { > + return r; > + } > + > + *id = out[0]; > + le64_to_cpus(out); > + > + return 0; > +} > + > +static int rbd_create(const char *filename, QEMUOptionParameter *options) > +{ > + int64_t bytes = 0; > + int64_t objsize; > + uint64_t size; > + time_t mtime; > + uint8_t obj_order = RBD_DEFAULT_OBJ_ORDER; > + char pool[RBD_MAX_SEG_NAME_SIZE]; > + char n[RBD_MAX_SEG_NAME_SIZE]; > + char name[RBD_MAX_SEG_NAME_SIZE]; > + char *snap; > + RbdHeader1 header; > + rados_pool_t p; > + uint64_t bid; > + uint32_t hi, lo; > + int ret; > + > + if (rbd_parsename(filename, pool, &snap, name) < 0) { > + return -EINVAL; > + } > + > + snprintf(n, RBD_MAX_SEG_NAME_SIZE, "%s%s", name, RBD_SUFFIX); > + > + /* Read out options */ > + while (options && options->name) { > + if (!strcmp(options->name, BLOCK_OPT_SIZE)) { > + bytes = options->value.n; > + } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { > + if (options->value.n) { > + objsize = options->value.n; > + if ((objsize - 1) & objsize) { /* not a power of 2? */ > + error_report("obj size needs to be power of 2"); > + return -EINVAL; > + } > + if (objsize < 4096) { > + error_report("obj size too small"); > + return -EINVAL; > + } > + > + for (obj_order = 0; obj_order < 64; obj_order++) { > + if (objsize == 1) { > + break; > + } > + objsize >>= 1; > + } > + } > + } > + options++; > + } > + > + memset(&header, 0, sizeof(header)); > + pstrcpy(header.text, sizeof(header.text), RBD_HEADER_TEXT); > + pstrcpy(header.signature, sizeof(header.signature), RBD_HEADER_SIGNATURE); > + pstrcpy(header.version, sizeof(header.version), RBD_HEADER_VERSION); > + header.image_size = bytes; > + cpu_to_le64s((uint64_t *) & header.image_size); > + header.options.order = obj_order; > + header.options.crypt_type = RBD_CRYPT_NONE; > + header.options.comp_type = RBD_COMP_NONE; > + header.snap_seq = 0; > + header.snap_count = 0; > + cpu_to_le32s(&header.snap_count); > + > + if (rados_initialize(0, NULL) < 0) { > + error_report("error initializing"); > + return -EIO; > + } > + > + if (rados_open_pool(pool, &p)) { > + error_report("error opening pool %s", pool); > + rados_deinitialize(); > + return -EIO; > + } > + > + /* check for existing rbd header file */ > + ret = rados_stat(p, n, &size, &mtime); > + if (ret == 0) { > + ret=-EEXIST; > + goto done; > + } > + > + ret = rbd_assign_bid(p, &bid); > + if (ret < 0) { > + error_report("failed assigning block id"); > + rados_deinitialize(); > + return -EIO; > + } > + hi = bid >> 32; > + lo = bid & 0xFFFFFFFF; > + snprintf(header.block_name, sizeof(header.block_name), "rb.%x.%x", hi, lo); > + > + /* create header file */ > + ret = rados_write(p, n, 0, (const char *)&header, sizeof(header)); > + if (ret < 0) { > + goto done; > + } > + > + ret = rbd_register_image(p, name); > +done: > + rados_close_pool(p); > + rados_deinitialize(); > + > + return ret; > +} > + > +static void rbd_aio_completion_cb(void *opaque) > +{ > + BDRVRBDState *s = opaque; > + > + uint64_t val; > + ssize_t ret; > + > + do { > + if ((ret = read(s->efd, &val, sizeof(val))) > 0) { > + s->qemu_aio_count -= val; > + } Bad indentation here. > + } while (ret < 0 && errno == EINTR); > + > + return; > +} > + > +static int rbd_aio_flush_cb(void *opaque) > +{ > + BDRVRBDState *s = opaque; > + > + return (s->qemu_aio_count > 0); > +} > + > + > +static int rbd_set_snapc(rados_pool_t pool, const char *snap, RbdHeader1 *header) > +{ > + uint32_t snap_count = header->snap_count; > + rados_snap_t *snaps = NULL; > + rados_snap_t seq; > + uint32_t i; > + uint64_t snap_names_len = header->snap_names_len; > + int r; > + rados_snap_t snapid = 0; > + > + cpu_to_le32s(&snap_count); > + cpu_to_le64s(&snap_names_len); > + if (snap_count) { > + const char *header_snap = (const char *)&header->snaps[snap_count]; Tab here. > + const char *end = header_snap + snap_names_len; > + snaps = qemu_malloc(sizeof(rados_snap_t) * header->snap_count); > + > + for (i=0; i < snap_count; i++) { > + snaps[i] = (uint64_t)header->snaps[i].id; > + cpu_to_le64s(&snaps[i]); > + > + if (snap && strcmp(snap, header_snap) == 0) { > + snapid = snaps[i]; > + } > + > + header_snap += strlen(header_snap) + 1; > + if (header_snap > end) > + error_report("bad header, snapshot list broken"); > + } > + } > + > + if (snap && !snapid) { > + error_report("snapshot not found"); > + return -ENOENT; > + } > + seq = header->snap_seq; > + cpu_to_le32s((uint32_t *)&seq); > + > + r = rados_set_snap_context(pool, seq, snaps, snap_count); > + > + rados_set_snap(pool, snapid); > + > + qemu_free(snaps); > + > + return r; > +} > + > +#define BUF_READ_START_LEN 4096 > + > +static int rbd_read_header(BDRVRBDState *s, char **hbuf) > +{ > + char *buf = NULL; > + char n[RBD_MAX_SEG_NAME_SIZE]; > + uint64_t len = BUF_READ_START_LEN; > + int r; > + > + snprintf(n, RBD_MAX_SEG_NAME_SIZE, "%s%s", s->name, RBD_SUFFIX); > + > + buf = qemu_malloc(len); > + > + r = rados_read(s->header_pool, n, 0, buf, len); > + if (r < 0) > + goto failed; > + > + if (r < len) > + goto done; > + > + qemu_free(buf); > + buf = qemu_malloc(len); > + > + r = rados_stat(s->header_pool, n, &len, NULL); > + if (r < 0) > + goto failed; > + > + r = rados_read(s->header_pool, n, 0, buf, len); > + if (r < 0) > + goto failed; > + > +done: > + *hbuf = buf; > + return 0; > + > +failed: > + qemu_free(buf); > + return r; > +} > + > +static int rbd_open(BlockDriverState *bs, const char *filename, int flags) > +{ > + BDRVRBDState *s = bs->opaque; > + char pool[RBD_MAX_SEG_NAME_SIZE]; > + char *snap; > + char *hbuf = NULL; > + int r; > + > + if (rbd_parsename(filename, pool, &snap, s->name) < 0) { > + return -EINVAL; > + } > + > + if ((r = rados_initialize(0, NULL)) < 0) { > + error_report("error initializing"); > + return r; > + } > + > + if ((r = rados_open_pool(pool, &s->pool))) { > + error_report("error opening pool %s", pool); > + rados_deinitialize(); > + return r; > + } > + > + if ((r = rados_open_pool(pool, &s->header_pool))) { > + error_report("error opening pool %s", pool); > + rados_deinitialize(); > + return r; > + } > + > + if ((r = rbd_read_header(s, &hbuf)) < 0) { > + error_report("error reading header from %s", s->name); > + goto failed; > + } > + > + if (strncmp(hbuf + 64, RBD_HEADER_SIGNATURE, 4)) { > + error_report("Invalid header signature %s", hbuf + 64); > + r = -EMEDIUMTYPE; > + goto failed; > + } > + > + if (strncmp(hbuf + 68, RBD_HEADER_VERSION, 8)) { > + error_report("Unknown image version %s", hbuf + 68); > + r = -EMEDIUMTYPE; > + goto failed; > + } > + > + RbdHeader1 *header; > + > + header = (RbdHeader1 *) hbuf; > + le64_to_cpus((uint64_t *) & header->image_size); > + s->size = header->image_size; > + s->objsize = 1 << header->options.order; > + memcpy(s->block_name, header->block_name, sizeof(header->block_name)); > + > + r = rbd_set_snapc(s->pool, snap, header); > + if (r < 0) { > + error_report("failed setting snap context: %s", strerror(-r)); > + goto failed; > + } > + > + s->read_only = (snap != NULL); > + > + s->efd = eventfd(0, 0); > + if (s->efd < 0) { > + error_report("error opening eventfd"); > + goto failed; > + } > + fcntl(s->efd, F_SETFL, O_NONBLOCK); > + qemu_aio_set_fd_handler(s->efd, rbd_aio_completion_cb, NULL, > + rbd_aio_flush_cb, NULL, s); > + > + qemu_free(hbuf); > + > + return 0; > + > +failed: > + if (hbuf) > + qemu_free(hbuf); > + > + rados_close_pool(s->header_pool); > + rados_close_pool(s->pool); > + rados_deinitialize(); > + return r; > +} > + > +static void rbd_close(BlockDriverState *bs) > +{ > + BDRVRBDState *s = bs->opaque; > + > + close(s->efd); > + qemu_aio_set_fd_handler(s->efd, NULL , NULL, NULL, NULL, NULL); > + > + rados_close_pool(s->header_pool); > + rados_close_pool(s->pool); > + rados_deinitialize(); > +} > + > +static int rbd_rw(BlockDriverState *bs, int64_t sector_num, > + uint8_t *buf, int nb_sectors, int write) > +{ > + BDRVRBDState *s = bs->opaque; > + char n[RBD_MAX_SEG_NAME_SIZE]; > + > + int64_t segnr, segoffs, segsize, r; > + int64_t off, size; > + > + off = sector_num * BDRV_SECTOR_SIZE; > + size = nb_sectors * BDRV_SECTOR_SIZE; > + segnr = off / s->objsize; > + segoffs = off % s->objsize; > + segsize = s->objsize - segoffs; > + > + while (size > 0) { > + if (size < segsize) { > + segsize = size; > + } > + > + snprintf(n, RBD_MAX_SEG_NAME_SIZE, "%s.%012" PRIx64, s->block_name, segnr); > + > + if (write) { > + if (s->read_only) > + return -EROFS; > + if ((r = rados_write(s->pool, n, segoffs, (const char *)buf, > + segsize)) < 0) { > + return r; > + } > + } else { > + r = rados_read(s->pool, n, segoffs, (char *)buf, segsize); > + if (r == -ENOENT) { > + memset(buf, 0, segsize); > + } else if (r < 0) { > + return r; > + } else if (r < segsize) { > + memset(buf + r, 0, segsize - r); > + } > + } > + > + buf += segsize; > + size -= segsize; > + segoffs = 0; > + segsize = s->objsize; > + segnr++; > + } > + > + return 0; > +} > + > +static int rbd_read(BlockDriverState *bs, int64_t sector_num, > + uint8_t *buf, int nb_sectors) > +{ > + return rbd_rw(bs, sector_num, buf, nb_sectors, 0); > +} > + > +static int rbd_write(BlockDriverState *bs, int64_t sector_num, > + const uint8_t *buf, int nb_sectors) > +{ > + return rbd_rw(bs, sector_num, (uint8_t *) buf, nb_sectors, 1); > +} > + > +static void rbd_aio_cancel(BlockDriverAIOCB *blockacb) > +{ > + RBDAIOCB *acb = (RBDAIOCB *) blockacb; > + qemu_bh_delete(acb->bh); > + acb->bh = NULL; > + qemu_aio_release(acb); > +} > + > +static AIOPool rbd_aio_pool = { > + .aiocb_size = sizeof(RBDAIOCB), > + .cancel = rbd_aio_cancel, > +}; > + > +/* This is the callback function for rados_aio_read and _write */ > + > +static void rbd_finish_aiocb(rados_completion_t c, RADOSCB *rcb) > +{ > + RBDAIOCB *acb = rcb->acb; > + int64_t r; > + uint64_t buf = 1; > + int i; > + > + acb->aiocnt--; > + r = rados_aio_get_return_value(c); > + rados_aio_release(c); > + if (acb->write) { > + if (r < 0) { > + acb->ret = r; > + acb->error = 1; > + } else if (!acb->error) { > + acb->ret += rcb->segsize; > + } > + } else { > + if (r == -ENOENT) { > + memset(rcb->buf, 0, rcb->segsize); > + if (!acb->error) { > + acb->ret += rcb->segsize; > + } > + } else if (r < 0) { > + acb->ret = r; > + acb->error = 1; > + } else if (r < rcb->segsize) { > + memset(rcb->buf + r, 0, rcb->segsize - r); > + if (!acb->error) { > + acb->ret += rcb->segsize; > + } > + } else if (!acb->error) { > + acb->ret += r; > + } > + } > + if (write(acb->s->efd, &buf, sizeof(buf)) < 0) > + error_report("failed writing to acb->s->efd\n"); > + qemu_free(rcb); > + i = 0; > + if (!acb->aiocnt && acb->bh) { > + qemu_bh_schedule(acb->bh); > + } > +} > + > +/* Callback when all queued rados_aio requests are complete */ > + > +static void rbd_aio_bh_cb(void *opaque) > +{ > + RBDAIOCB *acb = opaque; > + uint64_t buf = 1; > + > + if (!acb->write) { > + qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); > + } > + qemu_vfree(acb->bounce); > + acb->common.cb(acb->common.opaque, (acb->ret > 0 ? 0 : acb->ret)); > + qemu_bh_delete(acb->bh); > + acb->bh = NULL; > + > + if (write(acb->s->efd, &buf, sizeof(buf)) < 0) > + error_report("failed writing to acb->s->efd\n"); > + qemu_aio_release(acb); > +} > + > +static BlockDriverAIOCB *rbd_aio_rw_vector(BlockDriverState *bs, > + int64_t sector_num, > + QEMUIOVector *qiov, > + int nb_sectors, > + BlockDriverCompletionFunc *cb, > + void *opaque, int write) > +{ > + RBDAIOCB *acb; > + RADOSCB *rcb; > + rados_completion_t c; > + char n[RBD_MAX_SEG_NAME_SIZE]; > + int64_t segnr, segoffs, segsize, last_segnr; > + int64_t off, size; > + char *buf; > + > + BDRVRBDState *s = bs->opaque; > + > + acb = qemu_aio_get(&rbd_aio_pool, bs, cb, opaque); > + acb->write = write; > + acb->qiov = qiov; > + acb->bounce = qemu_blockalign(bs, qiov->size); > + acb->aiocnt = 0; > + acb->ret = 0; > + acb->error = 0; > + acb->s = s; > + > + if (!acb->bh) { > + acb->bh = qemu_bh_new(rbd_aio_bh_cb, acb); > + } > + > + if (write) { > + qemu_iovec_to_buffer(acb->qiov, acb->bounce); > + } > + > + buf = acb->bounce; > + > + off = sector_num * BDRV_SECTOR_SIZE; > + size = nb_sectors * BDRV_SECTOR_SIZE; > + segnr = off / s->objsize; > + segoffs = off % s->objsize; > + segsize = s->objsize - segoffs; > + > + last_segnr = ((off + size - 1) / s->objsize); > + acb->aiocnt = (last_segnr - segnr) + 1; > + > + s->qemu_aio_count+=acb->aiocnt + 1; /* All the RADOSCB and the related RBDAIOCB */ > + > + if (write && s->read_only) { > + acb->ret = -EROFS; > + return NULL; > + } > + > + while (size > 0) { > + if (size < segsize) { > + segsize = size; > + } > + > + snprintf(n, RBD_MAX_SEG_NAME_SIZE, "%s.%012" PRIx64, s->block_name, > + segnr); > + > + rcb = qemu_malloc(sizeof(RADOSCB)); > + rcb->done = 0; > + rcb->acb = acb; > + rcb->segsize = segsize; > + rcb->buf = buf; > + > + if (write) { > + rados_aio_create_completion(rcb, NULL, > + (rados_callback_t) rbd_finish_aiocb, > + &c); > + rados_aio_write(s->pool, n, segoffs, buf, segsize, c); > + } else { > + rados_aio_create_completion(rcb, > + (rados_callback_t) rbd_finish_aiocb, > + NULL, &c); > + rados_aio_read(s->pool, n, segoffs, buf, segsize, c); > + } > + > + buf += segsize; > + size -= segsize; > + segoffs = 0; > + segsize = s->objsize; > + segnr++; > + } > + > + return &acb->common; > +} > + > +static BlockDriverAIOCB *rbd_aio_readv(BlockDriverState * bs, > + int64_t sector_num, QEMUIOVector * qiov, > + int nb_sectors, > + BlockDriverCompletionFunc * cb, > + void *opaque) > +{ > + return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); > +} > + > +static BlockDriverAIOCB *rbd_aio_writev(BlockDriverState * bs, > + int64_t sector_num, QEMUIOVector * qiov, > + int nb_sectors, > + BlockDriverCompletionFunc * cb, > + void *opaque) > +{ > + return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); > +} > + > +static int rbd_getinfo(BlockDriverState * bs, BlockDriverInfo * bdi) > +{ > + BDRVRBDState *s = bs->opaque; > + bdi->cluster_size = s->objsize; > + return 0; > +} > + > +static int64_t rbd_getlength(BlockDriverState * bs) > +{ > + BDRVRBDState *s = bs->opaque; > + > + return s->size; > +} > + > +static int rbd_snap_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) > +{ > + BDRVRBDState *s = bs->opaque; > + char inbuf[512], outbuf[128]; > + uint64_t snap_id; > + int r; > + char *p = inbuf; > + char *end = inbuf + sizeof(inbuf); > + char n[RBD_MAX_SEG_NAME_SIZE]; > + char *hbuf = NULL; > + > + if (sn_info->name[0] == '\0') > + return -EINVAL; /* we need a name for rbd snapshots */ > + > + /* > + * rbd snapshots are using the name as the user controlled unique identifier > + * we can't use the rbd snapid for that purpose, as it can't be set > + */ > + if (sn_info->id_str[0] != '\0' && > + strcmp(sn_info->id_str, sn_info->name) != 0) > + return -EINVAL; > + > + if (strlen(sn_info->name) >= sizeof(sn_info->id_str)) > + return -ERANGE; > + > + r = rados_selfmanaged_snap_create(s->header_pool, &snap_id); > + if (r < 0) { > + error_report("failed to create snap id: %s", strerror(-r)); > + return r; > + } > + > + *(uint32_t *)p = strlen(sn_info->name); > + cpu_to_le32s((uint32_t *)p); > + p += sizeof(uint32_t); > + strncpy(p, sn_info->name, end - p); > + p += strlen(p); > + if (p + sizeof(snap_id) > end) { > + error_report("invalid input parameter"); > + return -EINVAL; > + } > + > + *(uint64_t *)p = snap_id; > + cpu_to_le64s((uint64_t *)p); > + > + snprintf(n, RBD_MAX_SEG_NAME_SIZE, "%s%s", s->name, RBD_SUFFIX); > + > + r = rados_exec(s->header_pool, n, "rbd", "snap_add", inbuf, > + sizeof(inbuf), outbuf, sizeof(outbuf)); > + if (r < 0) { > + error_report("rbd.snap_add execution failed failed: %s", strerror(-r)); > + return r; > + } > + > + sprintf(sn_info->id_str, "%s", sn_info->name); > + > + r = rbd_read_header(s, &hbuf); > + if (r < 0) { > + error_report("failed reading header: %s", strerror(-r)); > + return r; > + } > + > + RbdHeader1 *header; > + > + header = (RbdHeader1 *) hbuf; > + r = rbd_set_snapc(s->pool, sn_info->name, header); > + if (r < 0) { > + error_report("failed setting snap context: %s", strerror(-r)); > + goto failed; > + } > + > + return 0; > + > +failed: > + if (hbuf) > + qemu_free(header); > + return r; > +} > + > +static QEMUOptionParameter rbd_create_options[] = { > + { > + .name = BLOCK_OPT_SIZE, > + .type = OPT_SIZE, > + .help = "Virtual disk size" > + }, > + { > + .name = BLOCK_OPT_CLUSTER_SIZE, > + .type = OPT_SIZE, > + .help = "RBD object size" > + }, > + {NULL} > +}; > + > +static BlockDriver bdrv_rbd = { > + .format_name = "rbd", > + .instance_size = sizeof(BDRVRBDState), > + .bdrv_file_open = rbd_open, > + .bdrv_read = rbd_read, > + .bdrv_write = rbd_write, > + .bdrv_close = rbd_close, > + .bdrv_create = rbd_create, > + .bdrv_get_info = rbd_getinfo, > + .create_options = rbd_create_options, > + .bdrv_getlength = rbd_getlength, > + .protocol_name = "rbd", > + > + .bdrv_aio_readv = rbd_aio_readv, > + .bdrv_aio_writev = rbd_aio_writev, > + > + .bdrv_snapshot_create = rbd_snap_create, > +}; > + > +static void bdrv_rbd_init(void) > +{ > + bdrv_register(&bdrv_rbd); > +} > + > +block_init(bdrv_rbd_init); > diff --git a/block/rbd_types.h b/block/rbd_types.h > new file mode 100644 > index 0000000..c35d840 > --- /dev/null > +++ b/block/rbd_types.h > @@ -0,0 +1,71 @@ > +/* > + * Ceph - scalable distributed file system > + * > + * Copyright (C) 2004-2010 Sage Weil <sage@xxxxxxxxxxxx> > + * > + * This is free software; you can redistribute it and/or > + * modify it under the terms of the GNU Lesser General Public > + * License version 2.1, as published by the Free Software > + * Foundation. See file COPYING. > + * > + */ > + > +#ifndef CEPH_RBD_TYPES_H > +#define CEPH_RBD_TYPES_H > + > + > +/* > + * rbd image 'foo' consists of objects > + * foo.rbd - image metadata > + * foo.00000000 > + * foo.00000001 > + * ... - data > + */ > + > +#define RBD_SUFFIX ".rbd" > +#define RBD_DIRECTORY "rbd_directory" > +#define RBD_INFO "rbd_info" > + > +#define RBD_DEFAULT_OBJ_ORDER 22 /* 4MB */ > + > +#define RBD_MAX_OBJ_NAME_SIZE 96 > +#define RBD_MAX_BLOCK_NAME_SIZE 24 > +#define RBD_MAX_SEG_NAME_SIZE 128 > + > +#define RBD_COMP_NONE 0 > +#define RBD_CRYPT_NONE 0 > + > +#define RBD_HEADER_TEXT "<<< Rados Block Device Image >>>\n" > +#define RBD_HEADER_SIGNATURE "RBD" > +#define RBD_HEADER_VERSION "001.005" > + > +struct rbd_info { > + uint64_t max_id; > +} __attribute__ ((packed)); > + > +struct rbd_obj_snap_ondisk { > + uint64_t id; > + uint64_t image_size; > +} __attribute__((packed)); > + > +struct rbd_obj_header_ondisk { > + char text[40]; > + char block_name[RBD_MAX_BLOCK_NAME_SIZE]; > + char signature[4]; > + char version[8]; > + struct { > + uint8_t order; > + uint8_t crypt_type; > + uint8_t comp_type; > + uint8_t unused; > + } __attribute__((packed)) options; > + uint64_t image_size; > + uint64_t snap_seq; > + uint32_t snap_count; > + uint32_t reserved; > + uint64_t snap_names_len; > + struct rbd_obj_snap_ondisk snaps[0]; > +} __attribute__((packed)); > + > + > +#endif > diff --git a/configure b/configure > index a20371c..d135445 100755 > --- a/configure > +++ b/configure > @@ -315,6 +315,7 @@ pkgversion="" > check_utests="no" > user_pie="no" > zero_malloc="" > +rbd="" > > # OS specific > if check_define __linux__ ; then > @@ -709,6 +710,10 @@ for opt do > ;; > --*dir) > ;; > + --disable-rbd) rbd="no" > + ;; > + --enable-rbd) rbd="yes" > + ;; > *) echo "ERROR: unknown option $opt"; show_help="yes" > ;; > esac > @@ -895,6 +900,7 @@ echo " --enable-docs enable documentation build" > echo " --disable-docs disable documentation build" > echo " --disable-vhost-net disable vhost-net acceleration support" > echo " --enable-vhost-net enable vhost-net acceleration support" > +echo " --enable-rbd enable building the rados block device (rbd)" Tab here. > echo "" > echo "NOTE: The object files are built at the place where configure is launched" > exit 1 > @@ -1701,6 +1707,27 @@ if test "$mingw32" != yes -a "$pthread" = no; then > fi > > ########################################## > +# rbd probe > +if test "$rbd" != "no" ; then > + cat > $TMPC <<EOF > +#include <stdio.h> > +#include <rados/librados.h> > +int main(void) { rados_initialize(0, NULL); return 0; } > +EOF > + rbd_libs="-lrados -lcrypto" > + if compile_prog "" "$rbd_libs" ; then > + rbd=yes > + libs_tools="$rbd_libs $libs_tools" > + libs_softmmu="$rbd_libs $libs_softmmu" > + else > + if test "$rbd" = "yes" ; then > + feature_not_found "rados block device" > + fi > + rbd=no > + fi > +fi > + > +########################################## > # linux-aio probe > > if test "$linux_aio" != "no" ; then > @@ -2187,6 +2214,7 @@ echo "preadv support $preadv" > echo "fdatasync $fdatasync" > echo "uuid support $uuid" > echo "vhost-net support $vhost_net" > +echo "rbd support $rbd" > > if test $sdl_too_old = "yes"; then > echo "-> Your SDL version is too old - please upgrade to have SDL support" > @@ -2434,6 +2462,9 @@ echo "CONFIG_UNAME_RELEASE=\"$uname_release\"" >> $config_host_mak > if test "$zero_malloc" = "yes" ; then > echo "CONFIG_ZERO_MALLOC=y" >> $config_host_mak > fi > +if test "$rbd" = "yes" ; then > + echo "CONFIG_RBD=y" >> $config_host_mak > +fi > > # USB host support > case "$usb" in > -- mailto:av1474@xxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
