/*
* QEMU Block driver for RADOS (Ceph)
*
- * Copyright (C) 2010 Christian Brunner <chb@muc.de>
+ * Copyright (C) 2010-2011 Christian Brunner <chb@muc.de>,
+ * Josh Durgin <josh.durgin@dreamhost.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
+#include <inttypes.h>
+
#include "qemu-common.h"
#include "qemu-error.h"
-#include "rbd_types.h"
#include "block_int.h"
-#include <rados/librados.h>
+#include <rbd/librbd.h>
#define OBJ_MAX_SIZE (1UL << OBJ_DEFAULT_OBJ_ORDER)
+#define RBD_MAX_CONF_NAME_SIZE 128
+#define RBD_MAX_CONF_VAL_SIZE 512
+#define RBD_MAX_CONF_SIZE 1024
+#define RBD_MAX_POOL_NAME_SIZE 128
+#define RBD_MAX_SNAP_NAME_SIZE 128
+#define RBD_MAX_SNAPS 100
+
typedef struct RBDAIOCB {
BlockDriverAIOCB common;
QEMUBH *bh;
char *bounce;
int write;
int64_t sector_num;
- int aiocnt;
int error;
struct BDRVRBDState *s;
int cancelled;
RBDAIOCB *acb;
struct BDRVRBDState *s;
int done;
- int64_t segsize;
+ int64_t size;
char *buf;
int ret;
} RADOSCB;
typedef struct BDRVRBDState {
int fds[2];
- 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;
+ rados_t cluster;
+ rados_ioctx_t io_ctx;
+ rbd_image_t image;
+ char name[RBD_MAX_IMAGE_NAME_SIZE];
int qemu_aio_count;
+ char *snap;
int event_reader_pos;
RADOSCB *event_rcb;
} BDRVRBDState;
-typedef struct rbd_obj_header_ondisk RbdHeader1;
-
static void rbd_aio_bh_cb(void *opaque);
-static int rbd_next_tok(char *dst, int dst_len,
- char *src, char delim,
- const char *name,
- char **p)
+static int qemu_rbd_next_tok(char *dst, int dst_len,
+ char *src, char delim,
+ const char *name,
+ char **p)
{
int l;
char *end;
return 0;
}
-static int rbd_parsename(const char *filename,
- char *pool, int pool_len,
- char *snap, int snap_len,
- char *name, int name_len)
+static int qemu_rbd_parsename(const char *filename,
+ char *pool, int pool_len,
+ char *snap, int snap_len,
+ char *name, int name_len)
{
const char *start;
char *p, *buf;
buf = qemu_strdup(start);
p = buf;
- ret = rbd_next_tok(pool, pool_len, p, '/', "pool name", &p);
+ ret = qemu_rbd_next_tok(pool, pool_len, p, '/', "pool name", &p);
if (ret < 0 || !p) {
ret = -EINVAL;
goto done;
}
- ret = rbd_next_tok(name, name_len, p, '@', "object name", &p);
+ ret = qemu_rbd_next_tok(name, name_len, p, '@', "object name", &p);
if (ret < 0) {
goto done;
}
goto done;
}
- ret = rbd_next_tok(snap, snap_len, p, '\0', "snap name", &p);
+ ret = qemu_rbd_next_tok(snap, snap_len, p, '\0', "snap name", &p);
done:
qemu_free(buf);
return ret;
}
-static int create_tmap_op(uint8_t op, const char *name, char **tmap_desc)
-{
- uint32_t len = strlen(name);
- uint32_t len_le = cpu_to_le32(len);
- /* total_len = encoding op + name + empty buffer */
- uint32_t total_len = 1 + (sizeof(uint32_t) + len) + sizeof(uint32_t);
- uint8_t *desc = NULL;
-
- desc = qemu_malloc(total_len);
-
- *tmap_desc = (char *)desc;
-
- *desc = op;
- desc++;
- memcpy(desc, &len_le, sizeof(len_le));
- desc += sizeof(len_le);
- memcpy(desc, name, len);
- desc += len;
- len = 0; /* no need for endian conversion for 0 */
- memcpy(desc, &len, sizeof(len));
- desc += sizeof(len);
-
- return (char *)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;
- }
-
- le64_to_cpus(out);
- *id = out[0];
-
- return 0;
-}
-
-static int rbd_create(const char *filename, QEMUOptionParameter *options)
+static int qemu_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_OBJ_NAME_SIZE];
- char snap_buf[RBD_MAX_SEG_NAME_SIZE];
+ int obj_order = 0;
+ char pool[RBD_MAX_POOL_NAME_SIZE];
+ char name[RBD_MAX_IMAGE_NAME_SIZE];
+ char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
char *snap = NULL;
- RbdHeader1 header;
- rados_pool_t p;
- uint64_t bid;
- uint32_t hi, lo;
+ rados_t cluster;
+ rados_ioctx_t io_ctx;
int ret;
- if (rbd_parsename(filename,
- pool, sizeof(pool),
- snap_buf, sizeof(snap_buf),
- name, sizeof(name)) < 0) {
+ if (qemu_rbd_parsename(filename, pool, sizeof(pool),
+ snap_buf, sizeof(snap_buf),
+ name, sizeof(name)) < 0) {
return -EINVAL;
}
if (snap_buf[0] != '\0') {
snap = snap_buf;
}
- snprintf(n, sizeof(n), "%s%s", name, RBD_SUFFIX);
-
/* Read out options */
while (options && options->name) {
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
error_report("obj size too small");
return -EINVAL;
}
- obj_order = ffs(objsize) - 1;
+ obj_order = ffs(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 = cpu_to_le64(bytes);
- 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;
-
- if (rados_initialize(0, NULL) < 0) {
+ if (rados_create(&cluster, NULL) < 0) {
error_report("error initializing");
return -EIO;
}
- if (rados_open_pool(pool, &p)) {
- error_report("error opening pool %s", pool);
- rados_deinitialize();
+ if (rados_conf_read_file(cluster, NULL) < 0) {
+ error_report("error reading config file");
+ rados_shutdown(cluster);
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();
+ if (rados_connect(cluster) < 0) {
+ error_report("error connecting");
+ rados_shutdown(cluster);
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;
+ if (rados_ioctx_create(cluster, pool, &io_ctx) < 0) {
+ error_report("error opening pool %s", pool);
+ rados_shutdown(cluster);
+ return -EIO;
}
- ret = rbd_register_image(p, name);
-done:
- rados_close_pool(p);
- rados_deinitialize();
+ ret = rbd_create(io_ctx, name, bytes, &obj_order);
+ rados_ioctx_destroy(io_ctx);
+ rados_shutdown(cluster);
return ret;
}
/*
- * This aio completion is being called from rbd_aio_event_reader() and
- * runs in qemu context. It schedules a bh, but just in case the aio
+ * This aio completion is being called from qemu_rbd_aio_event_reader()
+ * and runs in qemu context. It schedules a bh, but just in case the aio
* was not cancelled before.
*/
-static void rbd_complete_aio(RADOSCB *rcb)
+static void qemu_rbd_complete_aio(RADOSCB *rcb)
{
RBDAIOCB *acb = rcb->acb;
int64_t r;
- acb->aiocnt--;
-
if (acb->cancelled) {
- if (!acb->aiocnt) {
- qemu_vfree(acb->bounce);
- qemu_aio_release(acb);
- }
+ qemu_vfree(acb->bounce);
+ qemu_aio_release(acb);
goto done;
}
acb->ret = r;
acb->error = 1;
} else if (!acb->error) {
- acb->ret += rcb->segsize;
+ acb->ret = rcb->size;
}
} else {
- if (r == -ENOENT) {
- memset(rcb->buf, 0, rcb->segsize);
- if (!acb->error) {
- acb->ret += rcb->segsize;
- }
- } else if (r < 0) {
- memset(rcb->buf, 0, rcb->segsize);
+ if (r < 0) {
+ memset(rcb->buf, 0, rcb->size);
acb->ret = r;
acb->error = 1;
- } else if (r < rcb->segsize) {
- memset(rcb->buf + r, 0, rcb->segsize - r);
+ } else if (r < rcb->size) {
+ memset(rcb->buf + r, 0, rcb->size - r);
if (!acb->error) {
- acb->ret += rcb->segsize;
+ acb->ret = rcb->size;
}
} else if (!acb->error) {
- acb->ret += r;
+ acb->ret = r;
}
}
/* Note that acb->bh can be NULL in case where the aio was cancelled */
- if (!acb->aiocnt) {
- acb->bh = qemu_bh_new(rbd_aio_bh_cb, acb);
- qemu_bh_schedule(acb->bh);
- }
+ acb->bh = qemu_bh_new(rbd_aio_bh_cb, acb);
+ qemu_bh_schedule(acb->bh);
done:
qemu_free(rcb);
}
* aio fd read handler. It runs in the qemu context and calls the
* completion handling of completed rados aio operations.
*/
-static void rbd_aio_event_reader(void *opaque)
+static void qemu_rbd_aio_event_reader(void *opaque)
{
BDRVRBDState *s = opaque;
s->event_reader_pos += ret;
if (s->event_reader_pos == sizeof(s->event_rcb)) {
s->event_reader_pos = 0;
- rbd_complete_aio(s->event_rcb);
- s->qemu_aio_count --;
+ qemu_rbd_complete_aio(s->event_rcb);
+ s->qemu_aio_count--;
}
}
}
} while (ret < 0 && errno == EINTR);
}
-static int rbd_aio_flush_cb(void *opaque)
+static int qemu_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 = le32_to_cpu(header->snap_count);
- rados_snap_t *snaps = NULL;
- rados_snap_t seq;
- uint32_t i;
- uint64_t snap_names_len = le64_to_cpu(header->snap_names_len);
- int r;
- rados_snap_t snapid = 0;
-
- if (snap_count) {
- const char *header_snap = (const char *)&header->snaps[snap_count];
- 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] = le64_to_cpu(header->snaps[i].id);
-
- 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");
- qemu_free(snaps);
- return -ENOENT;
- }
- seq = le32_to_cpu(header->snap_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, sizeof(n), "%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)
+static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRBDState *s = bs->opaque;
- RbdHeader1 *header;
- char pool[RBD_MAX_SEG_NAME_SIZE];
- char snap_buf[RBD_MAX_SEG_NAME_SIZE];
- char *snap = NULL;
- char *hbuf = NULL;
+ char pool[RBD_MAX_POOL_NAME_SIZE];
+ char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
int r;
- if (rbd_parsename(filename, pool, sizeof(pool),
- snap_buf, sizeof(snap_buf),
- s->name, sizeof(s->name)) < 0) {
+ if (qemu_rbd_parsename(filename, pool, sizeof(pool),
+ snap_buf, sizeof(snap_buf),
+ s->name, sizeof(s->name)) < 0) {
return -EINVAL;
}
+ s->snap = NULL;
if (snap_buf[0] != '\0') {
- snap = snap_buf;
+ s->snap = qemu_strdup(snap_buf);
}
- if ((r = rados_initialize(0, NULL)) < 0) {
+ r = rados_create(&s->cluster, NULL);
+ if (r < 0) {
error_report("error initializing");
return r;
}
- if ((r = rados_open_pool(pool, &s->pool))) {
- error_report("error opening pool %s", pool);
- rados_deinitialize();
+ r = rados_conf_read_file(s->cluster, NULL);
+ if (r < 0) {
+ error_report("error reading config file");
+ rados_shutdown(s->cluster);
return r;
}
- if ((r = rados_open_pool(pool, &s->header_pool))) {
- error_report("error opening pool %s", pool);
- rados_deinitialize();
+ r = rados_connect(s->cluster);
+ if (r < 0) {
+ error_report("error connecting");
+ rados_shutdown(s->cluster);
return r;
}
- if ((r = rbd_read_header(s, &hbuf)) < 0) {
- error_report("error reading header from %s", s->name);
- goto failed;
- }
-
- if (memcmp(hbuf + 64, RBD_HEADER_SIGNATURE, 4)) {
- error_report("Invalid header signature");
- r = -EMEDIUMTYPE;
- goto failed;
- }
-
- if (memcmp(hbuf + 68, RBD_HEADER_VERSION, 8)) {
- error_report("Unknown image version");
- r = -EMEDIUMTYPE;
- goto failed;
+ r = rados_ioctx_create(s->cluster, pool, &s->io_ctx);
+ if (r < 0) {
+ error_report("error opening pool %s", pool);
+ rados_shutdown(s->cluster);
+ return r;
}
- header = (RbdHeader1 *) hbuf;
- s->size = le64_to_cpu(header->image_size);
- s->objsize = 1ULL << header->options.order;
- memcpy(s->block_name, header->block_name, sizeof(header->block_name));
-
- r = rbd_set_snapc(s->pool, snap, header);
+ r = rbd_open(s->io_ctx, s->name, &s->image, s->snap);
if (r < 0) {
- error_report("failed setting snap context: %s", strerror(-r));
- goto failed;
+ error_report("error reading header from %s", s->name);
+ rados_ioctx_destroy(s->io_ctx);
+ rados_shutdown(s->cluster);
+ return r;
}
- bs->read_only = (snap != NULL);
+ bs->read_only = (s->snap != NULL);
s->event_reader_pos = 0;
r = qemu_pipe(s->fds);
}
fcntl(s->fds[0], F_SETFL, O_NONBLOCK);
fcntl(s->fds[1], F_SETFL, O_NONBLOCK);
- qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], rbd_aio_event_reader, NULL,
- rbd_aio_flush_cb, NULL, s);
+ qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader,
+ NULL, qemu_rbd_aio_flush_cb, NULL, s);
- qemu_free(hbuf);
return 0;
failed:
- qemu_free(hbuf);
-
- rados_close_pool(s->header_pool);
- rados_close_pool(s->pool);
- rados_deinitialize();
+ rbd_close(s->image);
+ rados_ioctx_destroy(s->io_ctx);
+ rados_shutdown(s->cluster);
return r;
}
-static void rbd_close(BlockDriverState *bs)
+static void qemu_rbd_close(BlockDriverState *bs)
{
BDRVRBDState *s = bs->opaque;
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL , NULL, NULL, NULL,
NULL);
- rados_close_pool(s->header_pool);
- rados_close_pool(s->pool);
- rados_deinitialize();
+ rbd_close(s->image);
+ rados_ioctx_destroy(s->io_ctx);
+ qemu_free(s->snap);
+ rados_shutdown(s->cluster);
}
/*
* Cancel aio. Since we don't reference acb in a non qemu threads,
* it is safe to access it here.
*/
-static void rbd_aio_cancel(BlockDriverAIOCB *blockacb)
+static void qemu_rbd_aio_cancel(BlockDriverAIOCB *blockacb)
{
RBDAIOCB *acb = (RBDAIOCB *) blockacb;
acb->cancelled = 1;
static AIOPool rbd_aio_pool = {
.aiocb_size = sizeof(RBDAIOCB),
- .cancel = rbd_aio_cancel,
+ .cancel = qemu_rbd_aio_cancel,
};
-/*
- * This is the callback function for rados_aio_read and _write
- *
- * Note: this function is being called from a non qemu thread so
- * we need to be careful about what we do here. Generally we only
- * write to the block notification pipe, and do the rest of the
- * io completion handling from rbd_aio_event_reader() which
- * runs in a qemu context.
- */
-static void rbd_finish_aiocb(rados_completion_t c, RADOSCB *rcb)
+static int qemu_rbd_send_pipe(BDRVRBDState *s, RADOSCB *rcb)
{
- int ret;
- rcb->ret = rados_aio_get_return_value(c);
- rados_aio_release(c);
+ int ret = 0;
while (1) {
fd_set wfd;
- int fd = rcb->s->fds[RBD_FD_WRITE];
+ int fd = s->fds[RBD_FD_WRITE];
- /* send the rcb pointer to the qemu thread that is responsible
- for the aio completion. Must do it in a qemu thread context */
+ /* send the op pointer to the qemu thread that is responsible
+ for the aio/op completion. Must do it in a qemu thread context */
ret = write(fd, (void *)&rcb, sizeof(rcb));
if (ret >= 0) {
break;
}
if (errno == EINTR) {
continue;
- }
+ }
if (errno != EAGAIN) {
break;
- }
+ }
FD_ZERO(&wfd);
FD_SET(fd, &wfd);
} while (ret < 0 && errno == EINTR);
}
+ return ret;
+}
+
+/*
+ * This is the callback function for rbd_aio_read and _write
+ *
+ * Note: this function is being called from a non qemu thread so
+ * we need to be careful about what we do here. Generally we only
+ * write to the block notification pipe, and do the rest of the
+ * io completion handling from qemu_rbd_aio_event_reader() which
+ * runs in a qemu context.
+ */
+static void rbd_finish_aiocb(rbd_completion_t c, RADOSCB *rcb)
+{
+ int ret;
+ rcb->ret = rbd_aio_get_return_value(c);
+ rbd_aio_release(c);
+ ret = qemu_rbd_send_pipe(rcb->s, rcb);
if (ret < 0) {
- error_report("failed writing to acb->s->fds\n");
+ error_report("failed writing to acb->s->fds");
qemu_free(rcb);
}
}
-/* Callback when all queued rados_aio requests are complete */
+/* Callback when all queued rbd_aio requests are complete */
static void rbd_aio_bh_cb(void *opaque)
{
{
RBDAIOCB *acb;
RADOSCB *rcb;
- rados_completion_t c;
- char n[RBD_MAX_SEG_NAME_SIZE];
- int64_t segnr, segoffs, segsize, last_segnr;
+ rbd_completion_t c;
int64_t off, size;
char *buf;
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;
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; /* All the RADOSCB */
+ s->qemu_aio_count++; /* All the RADOSCB */
- while (size > 0) {
- if (size < segsize) {
- segsize = size;
- }
-
- snprintf(n, sizeof(n), "%s.%012" PRIx64, s->block_name,
- segnr);
-
- rcb = qemu_malloc(sizeof(RADOSCB));
- rcb->done = 0;
- rcb->acb = acb;
- rcb->segsize = segsize;
- rcb->buf = buf;
- rcb->s = acb->s;
-
- 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);
- }
+ rcb = qemu_malloc(sizeof(RADOSCB));
+ rcb->done = 0;
+ rcb->acb = acb;
+ rcb->buf = buf;
+ rcb->s = acb->s;
+ rcb->size = size;
- buf += segsize;
- size -= segsize;
- segoffs = 0;
- segsize = s->objsize;
- segnr++;
+ if (write) {
+ rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c);
+ rbd_aio_write(s->image, off, size, buf, c);
+ } else {
+ rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c);
+ rbd_aio_read(s->image, off, size, buf, c);
}
return &acb->common;
}
-static BlockDriverAIOCB *rbd_aio_readv(BlockDriverState * bs,
- int64_t sector_num, QEMUIOVector * qiov,
- int nb_sectors,
- BlockDriverCompletionFunc * cb,
- void *opaque)
+static BlockDriverAIOCB *qemu_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)
+static BlockDriverAIOCB *qemu_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)
+static int qemu_rbd_getinfo(BlockDriverState *bs, BlockDriverInfo *bdi)
{
BDRVRBDState *s = bs->opaque;
- bdi->cluster_size = s->objsize;
+ rbd_image_info_t info;
+ int r;
+
+ r = rbd_stat(s->image, &info, sizeof(info));
+ if (r < 0) {
+ return r;
+ }
+
+ bdi->cluster_size = info.obj_size;
return 0;
}
-static int64_t rbd_getlength(BlockDriverState * bs)
+static int64_t qemu_rbd_getlength(BlockDriverState *bs)
{
BDRVRBDState *s = bs->opaque;
+ rbd_image_info_t info;
+ int r;
- return s->size;
+ r = rbd_stat(s->image, &info, sizeof(info));
+ if (r < 0) {
+ return r;
+ }
+
+ return info.size;
}
-static int rbd_snap_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
+static int qemu_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;
- RbdHeader1 *header;
if (sn_info->name[0] == '\0') {
return -EINVAL; /* we need a name for rbd snapshots */
return -ERANGE;
}
- r = rados_selfmanaged_snap_create(s->header_pool, &snap_id);
+ r = rbd_snap_create(s->image, sn_info->name);
if (r < 0) {
- error_report("failed to create snap id: %s", strerror(-r));
+ error_report("failed to create snap: %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, sizeof(n), "%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;
- }
-
- 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:
- qemu_free(header);
- return r;
-}
-
-static int decode32(char **p, const char *end, uint32_t *v)
-{
- if (*p + 4 > end) {
- return -ERANGE;
- }
-
- *v = *(uint32_t *)(*p);
- le32_to_cpus(v);
- *p += 4;
return 0;
}
-static int decode64(char **p, const char *end, uint64_t *v)
-{
- if (*p + 8 > end) {
- return -ERANGE;
- }
-
- *v = *(uint64_t *)(*p);
- le64_to_cpus(v);
- *p += 8;
- return 0;
-}
-
-static int decode_str(char **p, const char *end, char **s)
-{
- uint32_t len;
- int r;
-
- if ((r = decode32(p, end, &len)) < 0) {
- return r;
- }
-
- *s = qemu_malloc(len + 1);
- memcpy(*s, *p, len);
- *p += len;
- (*s)[len] = '\0';
-
- return len;
-}
-
-static int rbd_snap_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
+static int qemu_rbd_snap_list(BlockDriverState *bs,
+ QEMUSnapshotInfo **psn_tab)
{
BDRVRBDState *s = bs->opaque;
- char n[RBD_MAX_SEG_NAME_SIZE];
QEMUSnapshotInfo *sn_info, *sn_tab = NULL;
- RbdHeader1 *header;
- char *hbuf = NULL;
- char *outbuf = NULL, *end, *buf;
- uint64_t len;
- uint64_t snap_seq;
- uint32_t snap_count;
- int r, i;
-
- /* read header to estimate how much space we need to read the snap
- * list */
- if ((r = rbd_read_header(s, &hbuf)) < 0) {
- goto done_err;
- }
- header = (RbdHeader1 *)hbuf;
- len = le64_to_cpu(header->snap_names_len);
- len += 1024; /* should have already been enough, but new snapshots might
- already been created since we read the header. just allocate
- a bit more, so that in most cases it'll suffice anyway */
- qemu_free(hbuf);
-
- snprintf(n, sizeof(n), "%s%s", s->name, RBD_SUFFIX);
- while (1) {
- qemu_free(outbuf);
- outbuf = qemu_malloc(len);
+ int i, snap_count;
+ rbd_snap_info_t *snaps;
+ int max_snaps = RBD_MAX_SNAPS;
- r = rados_exec(s->header_pool, n, "rbd", "snap_list", NULL, 0,
- outbuf, len);
- if (r < 0) {
- error_report("rbd.snap_list execution failed failed: %s", strerror(-r));
- goto done_err;
+ do {
+ snaps = qemu_malloc(sizeof(*snaps) * max_snaps);
+ snap_count = rbd_snap_list(s->image, snaps, &max_snaps);
+ if (snap_count < 0) {
+ qemu_free(snaps);
}
- if (r != len) {
- break;
- }
+ } while (snap_count == -ERANGE);
- /* if we're here, we probably raced with some snaps creation */
- len *= 2;
- }
- buf = outbuf;
- end = buf + len;
-
- if ((r = decode64(&buf, end, &snap_seq)) < 0) {
- goto done_err;
- }
- if ((r = decode32(&buf, end, &snap_count)) < 0) {
- goto done_err;
+ if (snap_count <= 0) {
+ return snap_count;
}
sn_tab = qemu_mallocz(snap_count * sizeof(QEMUSnapshotInfo));
- for (i = 0; i < snap_count; i++) {
- uint64_t id, image_size;
- char *snap_name;
- if ((r = decode64(&buf, end, &id)) < 0) {
- goto done_err;
- }
- if ((r = decode64(&buf, end, &image_size)) < 0) {
- goto done_err;
- }
- if ((r = decode_str(&buf, end, &snap_name)) < 0) {
- goto done_err;
- }
+ for (i = 0; i < snap_count; i++) {
+ const char *snap_name = snaps[i].name;
sn_info = sn_tab + i;
pstrcpy(sn_info->id_str, sizeof(sn_info->id_str), snap_name);
pstrcpy(sn_info->name, sizeof(sn_info->name), snap_name);
- qemu_free(snap_name);
- sn_info->vm_state_size = image_size;
+ sn_info->vm_state_size = snaps[i].size;
sn_info->date_sec = 0;
sn_info->date_nsec = 0;
sn_info->vm_clock_nsec = 0;
}
+ rbd_snap_list_end(snaps);
+
*psn_tab = sn_tab;
- qemu_free(outbuf);
return snap_count;
-done_err:
- qemu_free(sn_tab);
- qemu_free(outbuf);
- return r;
}
-static QEMUOptionParameter rbd_create_options[] = {
+static QEMUOptionParameter qemu_rbd_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
.type = OPT_SIZE,
static BlockDriver bdrv_rbd = {
.format_name = "rbd",
.instance_size = sizeof(BDRVRBDState),
- .bdrv_file_open = rbd_open,
- .bdrv_close = rbd_close,
- .bdrv_create = rbd_create,
- .bdrv_get_info = rbd_getinfo,
- .create_options = rbd_create_options,
- .bdrv_getlength = rbd_getlength,
+ .bdrv_file_open = qemu_rbd_open,
+ .bdrv_close = qemu_rbd_close,
+ .bdrv_create = qemu_rbd_create,
+ .bdrv_get_info = qemu_rbd_getinfo,
+ .create_options = qemu_rbd_create_options,
+ .bdrv_getlength = qemu_rbd_getlength,
.protocol_name = "rbd",
- .bdrv_aio_readv = rbd_aio_readv,
- .bdrv_aio_writev = rbd_aio_writev,
+ .bdrv_aio_readv = qemu_rbd_aio_readv,
+ .bdrv_aio_writev = qemu_rbd_aio_writev,
- .bdrv_snapshot_create = rbd_snap_create,
- .bdrv_snapshot_list = rbd_snap_list,
+ .bdrv_snapshot_create = qemu_rbd_snap_create,
+ .bdrv_snapshot_list = qemu_rbd_snap_list,
};
static void bdrv_rbd_init(void)
projects / sdk / emulator / qemu.git / commitdiff