947 lines
24 KiB
C
947 lines
24 KiB
C
/*
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* QEMU Block driver for RADOS (Ceph)
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*
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* Copyright (C) 2010-2011 Christian Brunner <chb@muc.de>,
|
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* Josh Durgin <josh.durgin@dreamhost.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include <inttypes.h>
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#include "qemu-common.h"
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#include "qemu/error-report.h"
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#include "block/block_int.h"
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#include <rbd/librbd.h>
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/*
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* When specifying the image filename use:
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*
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* rbd:poolname/devicename[@snapshotname][:option1=value1[:option2=value2...]]
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*
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* poolname must be the name of an existing rados pool.
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*
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* devicename is the name of the rbd image.
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*
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* Each option given is used to configure rados, and may be any valid
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* Ceph option, "id", or "conf".
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*
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* The "id" option indicates what user we should authenticate as to
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* the Ceph cluster. If it is excluded we will use the Ceph default
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* (normally 'admin').
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*
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* The "conf" option specifies a Ceph configuration file to read. If
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* it is not specified, we will read from the default Ceph locations
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* (e.g., /etc/ceph/ceph.conf). To avoid reading _any_ configuration
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* file, specify conf=/dev/null.
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*
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* Configuration values containing :, @, or = can be escaped with a
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* leading "\".
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*/
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/* rbd_aio_discard added in 0.1.2 */
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#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 2)
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#define LIBRBD_SUPPORTS_DISCARD
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#else
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#undef LIBRBD_SUPPORTS_DISCARD
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#endif
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#define OBJ_MAX_SIZE (1UL << OBJ_DEFAULT_OBJ_ORDER)
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#define RBD_MAX_CONF_NAME_SIZE 128
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#define RBD_MAX_CONF_VAL_SIZE 512
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#define RBD_MAX_CONF_SIZE 1024
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#define RBD_MAX_POOL_NAME_SIZE 128
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#define RBD_MAX_SNAP_NAME_SIZE 128
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#define RBD_MAX_SNAPS 100
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typedef enum {
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RBD_AIO_READ,
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RBD_AIO_WRITE,
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RBD_AIO_DISCARD,
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RBD_AIO_FLUSH
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} RBDAIOCmd;
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typedef struct RBDAIOCB {
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BlockDriverAIOCB common;
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QEMUBH *bh;
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int64_t ret;
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QEMUIOVector *qiov;
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char *bounce;
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RBDAIOCmd cmd;
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int64_t sector_num;
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int error;
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struct BDRVRBDState *s;
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int status;
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} RBDAIOCB;
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typedef struct RADOSCB {
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int rcbid;
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RBDAIOCB *acb;
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struct BDRVRBDState *s;
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int done;
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int64_t size;
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char *buf;
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int64_t ret;
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} RADOSCB;
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#define RBD_FD_READ 0
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#define RBD_FD_WRITE 1
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typedef struct BDRVRBDState {
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rados_t cluster;
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rados_ioctx_t io_ctx;
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rbd_image_t image;
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char name[RBD_MAX_IMAGE_NAME_SIZE];
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char *snap;
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} BDRVRBDState;
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static int qemu_rbd_next_tok(char *dst, int dst_len,
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char *src, char delim,
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const char *name,
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char **p, Error **errp)
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{
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int l;
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char *end;
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*p = NULL;
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if (delim != '\0') {
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for (end = src; *end; ++end) {
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if (*end == delim) {
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break;
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}
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if (*end == '\\' && end[1] != '\0') {
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end++;
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}
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}
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if (*end == delim) {
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*p = end + 1;
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*end = '\0';
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}
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}
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l = strlen(src);
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if (l >= dst_len) {
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error_setg(errp, "%s too long", name);
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return -EINVAL;
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} else if (l == 0) {
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error_setg(errp, "%s too short", name);
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return -EINVAL;
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}
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pstrcpy(dst, dst_len, src);
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return 0;
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}
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static void qemu_rbd_unescape(char *src)
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{
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char *p;
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for (p = src; *src; ++src, ++p) {
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if (*src == '\\' && src[1] != '\0') {
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src++;
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}
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*p = *src;
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}
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*p = '\0';
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}
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static int qemu_rbd_parsename(const char *filename,
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char *pool, int pool_len,
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char *snap, int snap_len,
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char *name, int name_len,
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char *conf, int conf_len,
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Error **errp)
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{
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const char *start;
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char *p, *buf;
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int ret;
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if (!strstart(filename, "rbd:", &start)) {
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error_setg(errp, "File name must start with 'rbd:'");
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return -EINVAL;
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}
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buf = g_strdup(start);
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p = buf;
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*snap = '\0';
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*conf = '\0';
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ret = qemu_rbd_next_tok(pool, pool_len, p,
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'/', "pool name", &p, errp);
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if (ret < 0 || !p) {
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ret = -EINVAL;
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goto done;
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}
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qemu_rbd_unescape(pool);
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if (strchr(p, '@')) {
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ret = qemu_rbd_next_tok(name, name_len, p,
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'@', "object name", &p, errp);
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if (ret < 0) {
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goto done;
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}
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ret = qemu_rbd_next_tok(snap, snap_len, p,
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':', "snap name", &p, errp);
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qemu_rbd_unescape(snap);
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} else {
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ret = qemu_rbd_next_tok(name, name_len, p,
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':', "object name", &p, errp);
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}
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qemu_rbd_unescape(name);
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if (ret < 0 || !p) {
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goto done;
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}
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ret = qemu_rbd_next_tok(conf, conf_len, p,
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'\0', "configuration", &p, errp);
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done:
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g_free(buf);
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return ret;
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}
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static char *qemu_rbd_parse_clientname(const char *conf, char *clientname)
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{
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const char *p = conf;
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while (*p) {
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int len;
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const char *end = strchr(p, ':');
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if (end) {
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len = end - p;
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} else {
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len = strlen(p);
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}
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if (strncmp(p, "id=", 3) == 0) {
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len -= 3;
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strncpy(clientname, p + 3, len);
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clientname[len] = '\0';
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return clientname;
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}
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if (end == NULL) {
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break;
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}
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p = end + 1;
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}
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return NULL;
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}
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static int qemu_rbd_set_conf(rados_t cluster, const char *conf, Error **errp)
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{
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char *p, *buf;
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char name[RBD_MAX_CONF_NAME_SIZE];
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char value[RBD_MAX_CONF_VAL_SIZE];
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int ret = 0;
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buf = g_strdup(conf);
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p = buf;
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while (p) {
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ret = qemu_rbd_next_tok(name, sizeof(name), p,
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'=', "conf option name", &p, errp);
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if (ret < 0) {
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break;
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}
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qemu_rbd_unescape(name);
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if (!p) {
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error_setg(errp, "conf option %s has no value", name);
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ret = -EINVAL;
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break;
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}
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ret = qemu_rbd_next_tok(value, sizeof(value), p,
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':', "conf option value", &p, errp);
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if (ret < 0) {
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break;
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}
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qemu_rbd_unescape(value);
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if (strcmp(name, "conf") == 0) {
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ret = rados_conf_read_file(cluster, value);
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if (ret < 0) {
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error_setg(errp, "error reading conf file %s", value);
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break;
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}
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} else if (strcmp(name, "id") == 0) {
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/* ignore, this is parsed by qemu_rbd_parse_clientname() */
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} else {
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ret = rados_conf_set(cluster, name, value);
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if (ret < 0) {
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error_setg(errp, "invalid conf option %s", name);
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ret = -EINVAL;
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break;
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}
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}
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}
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g_free(buf);
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return ret;
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}
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static int qemu_rbd_create(const char *filename, QemuOpts *opts, Error **errp)
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{
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Error *local_err = NULL;
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int64_t bytes = 0;
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int64_t objsize;
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int obj_order = 0;
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char pool[RBD_MAX_POOL_NAME_SIZE];
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char name[RBD_MAX_IMAGE_NAME_SIZE];
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char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
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char conf[RBD_MAX_CONF_SIZE];
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char clientname_buf[RBD_MAX_CONF_SIZE];
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char *clientname;
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rados_t cluster;
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rados_ioctx_t io_ctx;
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int ret;
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if (qemu_rbd_parsename(filename, pool, sizeof(pool),
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snap_buf, sizeof(snap_buf),
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name, sizeof(name),
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conf, sizeof(conf), &local_err) < 0) {
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error_propagate(errp, local_err);
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return -EINVAL;
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}
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/* Read out options */
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bytes = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
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BDRV_SECTOR_SIZE);
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objsize = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 0);
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if (objsize) {
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if ((objsize - 1) & objsize) { /* not a power of 2? */
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error_setg(errp, "obj size needs to be power of 2");
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return -EINVAL;
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}
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if (objsize < 4096) {
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error_setg(errp, "obj size too small");
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return -EINVAL;
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}
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obj_order = ffs(objsize) - 1;
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}
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clientname = qemu_rbd_parse_clientname(conf, clientname_buf);
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if (rados_create(&cluster, clientname) < 0) {
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error_setg(errp, "error initializing");
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return -EIO;
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}
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|
|
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if (strstr(conf, "conf=") == NULL) {
|
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/* try default location, but ignore failure */
|
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rados_conf_read_file(cluster, NULL);
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}
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|
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if (conf[0] != '\0' &&
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qemu_rbd_set_conf(cluster, conf, &local_err) < 0) {
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rados_shutdown(cluster);
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error_propagate(errp, local_err);
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return -EIO;
|
|
}
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|
|
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if (rados_connect(cluster) < 0) {
|
|
error_setg(errp, "error connecting");
|
|
rados_shutdown(cluster);
|
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return -EIO;
|
|
}
|
|
|
|
if (rados_ioctx_create(cluster, pool, &io_ctx) < 0) {
|
|
error_setg(errp, "error opening pool %s", pool);
|
|
rados_shutdown(cluster);
|
|
return -EIO;
|
|
}
|
|
|
|
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_finish_bh() and runs in qemu
|
|
* BH context.
|
|
*/
|
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static void qemu_rbd_complete_aio(RADOSCB *rcb)
|
|
{
|
|
RBDAIOCB *acb = rcb->acb;
|
|
int64_t r;
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|
|
|
r = rcb->ret;
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|
|
|
if (acb->cmd != RBD_AIO_READ) {
|
|
if (r < 0) {
|
|
acb->ret = r;
|
|
acb->error = 1;
|
|
} else if (!acb->error) {
|
|
acb->ret = rcb->size;
|
|
}
|
|
} else {
|
|
if (r < 0) {
|
|
memset(rcb->buf, 0, rcb->size);
|
|
acb->ret = r;
|
|
acb->error = 1;
|
|
} else if (r < rcb->size) {
|
|
memset(rcb->buf + r, 0, rcb->size - r);
|
|
if (!acb->error) {
|
|
acb->ret = rcb->size;
|
|
}
|
|
} else if (!acb->error) {
|
|
acb->ret = r;
|
|
}
|
|
}
|
|
|
|
g_free(rcb);
|
|
|
|
if (acb->cmd == RBD_AIO_READ) {
|
|
qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size);
|
|
}
|
|
qemu_vfree(acb->bounce);
|
|
acb->common.cb(acb->common.opaque, (acb->ret > 0 ? 0 : acb->ret));
|
|
acb->status = 0;
|
|
|
|
qemu_aio_unref(acb);
|
|
}
|
|
|
|
/* TODO Convert to fine grained options */
|
|
static QemuOptsList runtime_opts = {
|
|
.name = "rbd",
|
|
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "filename",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Specification of the rbd image",
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
char pool[RBD_MAX_POOL_NAME_SIZE];
|
|
char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
|
|
char conf[RBD_MAX_CONF_SIZE];
|
|
char clientname_buf[RBD_MAX_CONF_SIZE];
|
|
char *clientname;
|
|
QemuOpts *opts;
|
|
Error *local_err = NULL;
|
|
const char *filename;
|
|
int r;
|
|
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
qemu_opts_del(opts);
|
|
return -EINVAL;
|
|
}
|
|
|
|
filename = qemu_opt_get(opts, "filename");
|
|
|
|
if (qemu_rbd_parsename(filename, pool, sizeof(pool),
|
|
snap_buf, sizeof(snap_buf),
|
|
s->name, sizeof(s->name),
|
|
conf, sizeof(conf), errp) < 0) {
|
|
r = -EINVAL;
|
|
goto failed_opts;
|
|
}
|
|
|
|
clientname = qemu_rbd_parse_clientname(conf, clientname_buf);
|
|
r = rados_create(&s->cluster, clientname);
|
|
if (r < 0) {
|
|
error_setg(&local_err, "error initializing");
|
|
goto failed_opts;
|
|
}
|
|
|
|
s->snap = NULL;
|
|
if (snap_buf[0] != '\0') {
|
|
s->snap = g_strdup(snap_buf);
|
|
}
|
|
|
|
/*
|
|
* Fallback to more conservative semantics if setting cache
|
|
* options fails. Ignore errors from setting rbd_cache because the
|
|
* only possible error is that the option does not exist, and
|
|
* librbd defaults to no caching. If write through caching cannot
|
|
* be set up, fall back to no caching.
|
|
*/
|
|
if (flags & BDRV_O_NOCACHE) {
|
|
rados_conf_set(s->cluster, "rbd_cache", "false");
|
|
} else {
|
|
rados_conf_set(s->cluster, "rbd_cache", "true");
|
|
}
|
|
|
|
if (strstr(conf, "conf=") == NULL) {
|
|
/* try default location, but ignore failure */
|
|
rados_conf_read_file(s->cluster, NULL);
|
|
}
|
|
|
|
if (conf[0] != '\0') {
|
|
r = qemu_rbd_set_conf(s->cluster, conf, errp);
|
|
if (r < 0) {
|
|
goto failed_shutdown;
|
|
}
|
|
}
|
|
|
|
r = rados_connect(s->cluster);
|
|
if (r < 0) {
|
|
error_setg(&local_err, "error connecting");
|
|
goto failed_shutdown;
|
|
}
|
|
|
|
r = rados_ioctx_create(s->cluster, pool, &s->io_ctx);
|
|
if (r < 0) {
|
|
error_setg(&local_err, "error opening pool %s", pool);
|
|
goto failed_shutdown;
|
|
}
|
|
|
|
r = rbd_open(s->io_ctx, s->name, &s->image, s->snap);
|
|
if (r < 0) {
|
|
error_setg(&local_err, "error reading header from %s", s->name);
|
|
goto failed_open;
|
|
}
|
|
|
|
bs->read_only = (s->snap != NULL);
|
|
|
|
qemu_opts_del(opts);
|
|
return 0;
|
|
|
|
failed_open:
|
|
rados_ioctx_destroy(s->io_ctx);
|
|
failed_shutdown:
|
|
rados_shutdown(s->cluster);
|
|
g_free(s->snap);
|
|
failed_opts:
|
|
qemu_opts_del(opts);
|
|
return r;
|
|
}
|
|
|
|
static void qemu_rbd_close(BlockDriverState *bs)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
|
|
rbd_close(s->image);
|
|
rados_ioctx_destroy(s->io_ctx);
|
|
g_free(s->snap);
|
|
rados_shutdown(s->cluster);
|
|
}
|
|
|
|
static const AIOCBInfo rbd_aiocb_info = {
|
|
.aiocb_size = sizeof(RBDAIOCB),
|
|
};
|
|
|
|
static void rbd_finish_bh(void *opaque)
|
|
{
|
|
RADOSCB *rcb = opaque;
|
|
qemu_bh_delete(rcb->acb->bh);
|
|
qemu_rbd_complete_aio(rcb);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
* schedule a BH, and do the rest of the io completion handling
|
|
* from rbd_finish_bh() which runs in a qemu context.
|
|
*/
|
|
static void rbd_finish_aiocb(rbd_completion_t c, RADOSCB *rcb)
|
|
{
|
|
RBDAIOCB *acb = rcb->acb;
|
|
|
|
rcb->ret = rbd_aio_get_return_value(c);
|
|
rbd_aio_release(c);
|
|
|
|
acb->bh = aio_bh_new(bdrv_get_aio_context(acb->common.bs),
|
|
rbd_finish_bh, rcb);
|
|
qemu_bh_schedule(acb->bh);
|
|
}
|
|
|
|
static int rbd_aio_discard_wrapper(rbd_image_t image,
|
|
uint64_t off,
|
|
uint64_t len,
|
|
rbd_completion_t comp)
|
|
{
|
|
#ifdef LIBRBD_SUPPORTS_DISCARD
|
|
return rbd_aio_discard(image, off, len, comp);
|
|
#else
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
static int rbd_aio_flush_wrapper(rbd_image_t image,
|
|
rbd_completion_t comp)
|
|
{
|
|
#ifdef LIBRBD_SUPPORTS_AIO_FLUSH
|
|
return rbd_aio_flush(image, comp);
|
|
#else
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
QEMUIOVector *qiov,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque,
|
|
RBDAIOCmd cmd)
|
|
{
|
|
RBDAIOCB *acb;
|
|
RADOSCB *rcb = NULL;
|
|
rbd_completion_t c;
|
|
int64_t off, size;
|
|
char *buf;
|
|
int r;
|
|
|
|
BDRVRBDState *s = bs->opaque;
|
|
|
|
acb = qemu_aio_get(&rbd_aiocb_info, bs, cb, opaque);
|
|
acb->cmd = cmd;
|
|
acb->qiov = qiov;
|
|
if (cmd == RBD_AIO_DISCARD || cmd == RBD_AIO_FLUSH) {
|
|
acb->bounce = NULL;
|
|
} else {
|
|
acb->bounce = qemu_try_blockalign(bs, qiov->size);
|
|
if (acb->bounce == NULL) {
|
|
goto failed;
|
|
}
|
|
}
|
|
acb->ret = 0;
|
|
acb->error = 0;
|
|
acb->s = s;
|
|
acb->bh = NULL;
|
|
acb->status = -EINPROGRESS;
|
|
|
|
if (cmd == RBD_AIO_WRITE) {
|
|
qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size);
|
|
}
|
|
|
|
buf = acb->bounce;
|
|
|
|
off = sector_num * BDRV_SECTOR_SIZE;
|
|
size = nb_sectors * BDRV_SECTOR_SIZE;
|
|
|
|
rcb = g_new(RADOSCB, 1);
|
|
rcb->done = 0;
|
|
rcb->acb = acb;
|
|
rcb->buf = buf;
|
|
rcb->s = acb->s;
|
|
rcb->size = size;
|
|
r = rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c);
|
|
if (r < 0) {
|
|
goto failed;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case RBD_AIO_WRITE:
|
|
r = rbd_aio_write(s->image, off, size, buf, c);
|
|
break;
|
|
case RBD_AIO_READ:
|
|
r = rbd_aio_read(s->image, off, size, buf, c);
|
|
break;
|
|
case RBD_AIO_DISCARD:
|
|
r = rbd_aio_discard_wrapper(s->image, off, size, c);
|
|
break;
|
|
case RBD_AIO_FLUSH:
|
|
r = rbd_aio_flush_wrapper(s->image, c);
|
|
break;
|
|
default:
|
|
r = -EINVAL;
|
|
}
|
|
|
|
if (r < 0) {
|
|
goto failed_completion;
|
|
}
|
|
|
|
return &acb->common;
|
|
|
|
failed_completion:
|
|
rbd_aio_release(c);
|
|
failed:
|
|
g_free(rcb);
|
|
qemu_vfree(acb->bounce);
|
|
qemu_aio_unref(acb);
|
|
return NULL;
|
|
}
|
|
|
|
static BlockDriverAIOCB *qemu_rbd_aio_readv(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
QEMUIOVector *qiov,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
return rbd_start_aio(bs, sector_num, qiov, nb_sectors, cb, opaque,
|
|
RBD_AIO_READ);
|
|
}
|
|
|
|
static BlockDriverAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
QEMUIOVector *qiov,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
return rbd_start_aio(bs, sector_num, qiov, nb_sectors, cb, opaque,
|
|
RBD_AIO_WRITE);
|
|
}
|
|
|
|
#ifdef LIBRBD_SUPPORTS_AIO_FLUSH
|
|
static BlockDriverAIOCB *qemu_rbd_aio_flush(BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
return rbd_start_aio(bs, 0, NULL, 0, cb, opaque, RBD_AIO_FLUSH);
|
|
}
|
|
|
|
#else
|
|
|
|
static int qemu_rbd_co_flush(BlockDriverState *bs)
|
|
{
|
|
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 1)
|
|
/* rbd_flush added in 0.1.1 */
|
|
BDRVRBDState *s = bs->opaque;
|
|
return rbd_flush(s->image);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
static int qemu_rbd_getinfo(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
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 qemu_rbd_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
rbd_image_info_t info;
|
|
int r;
|
|
|
|
r = rbd_stat(s->image, &info, sizeof(info));
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
|
|
return info.size;
|
|
}
|
|
|
|
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
int r;
|
|
|
|
r = rbd_resize(s->image, offset);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qemu_rbd_snap_create(BlockDriverState *bs,
|
|
QEMUSnapshotInfo *sn_info)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
int r;
|
|
|
|
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 = rbd_snap_create(s->image, sn_info->name);
|
|
if (r < 0) {
|
|
error_report("failed to create snap: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qemu_rbd_snap_remove(BlockDriverState *bs,
|
|
const char *snapshot_id,
|
|
const char *snapshot_name,
|
|
Error **errp)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
int r;
|
|
|
|
if (!snapshot_name) {
|
|
error_setg(errp, "rbd need a valid snapshot name");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If snapshot_id is specified, it must be equal to name, see
|
|
qemu_rbd_snap_list() */
|
|
if (snapshot_id && strcmp(snapshot_id, snapshot_name)) {
|
|
error_setg(errp,
|
|
"rbd do not support snapshot id, it should be NULL or "
|
|
"equal to snapshot name");
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = rbd_snap_remove(s->image, snapshot_name);
|
|
if (r < 0) {
|
|
error_setg_errno(errp, -r, "Failed to remove the snapshot");
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static int qemu_rbd_snap_rollback(BlockDriverState *bs,
|
|
const char *snapshot_name)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
int r;
|
|
|
|
r = rbd_snap_rollback(s->image, snapshot_name);
|
|
return r;
|
|
}
|
|
|
|
static int qemu_rbd_snap_list(BlockDriverState *bs,
|
|
QEMUSnapshotInfo **psn_tab)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
QEMUSnapshotInfo *sn_info, *sn_tab = NULL;
|
|
int i, snap_count;
|
|
rbd_snap_info_t *snaps;
|
|
int max_snaps = RBD_MAX_SNAPS;
|
|
|
|
do {
|
|
snaps = g_new(rbd_snap_info_t, max_snaps);
|
|
snap_count = rbd_snap_list(s->image, snaps, &max_snaps);
|
|
if (snap_count <= 0) {
|
|
g_free(snaps);
|
|
}
|
|
} while (snap_count == -ERANGE);
|
|
|
|
if (snap_count <= 0) {
|
|
goto done;
|
|
}
|
|
|
|
sn_tab = g_new0(QEMUSnapshotInfo, snap_count);
|
|
|
|
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);
|
|
|
|
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);
|
|
g_free(snaps);
|
|
|
|
done:
|
|
*psn_tab = sn_tab;
|
|
return snap_count;
|
|
}
|
|
|
|
#ifdef LIBRBD_SUPPORTS_DISCARD
|
|
static BlockDriverAIOCB* qemu_rbd_aio_discard(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque)
|
|
{
|
|
return rbd_start_aio(bs, sector_num, NULL, nb_sectors, cb, opaque,
|
|
RBD_AIO_DISCARD);
|
|
}
|
|
#endif
|
|
|
|
static QemuOptsList qemu_rbd_create_opts = {
|
|
.name = "rbd-create-opts",
|
|
.head = QTAILQ_HEAD_INITIALIZER(qemu_rbd_create_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_CLUSTER_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "RBD object size"
|
|
},
|
|
{ /* end of list */ }
|
|
}
|
|
};
|
|
|
|
static BlockDriver bdrv_rbd = {
|
|
.format_name = "rbd",
|
|
.instance_size = sizeof(BDRVRBDState),
|
|
.bdrv_needs_filename = true,
|
|
.bdrv_file_open = qemu_rbd_open,
|
|
.bdrv_close = qemu_rbd_close,
|
|
.bdrv_create = qemu_rbd_create,
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_get_info = qemu_rbd_getinfo,
|
|
.create_opts = &qemu_rbd_create_opts,
|
|
.bdrv_getlength = qemu_rbd_getlength,
|
|
.bdrv_truncate = qemu_rbd_truncate,
|
|
.protocol_name = "rbd",
|
|
|
|
.bdrv_aio_readv = qemu_rbd_aio_readv,
|
|
.bdrv_aio_writev = qemu_rbd_aio_writev,
|
|
|
|
#ifdef LIBRBD_SUPPORTS_AIO_FLUSH
|
|
.bdrv_aio_flush = qemu_rbd_aio_flush,
|
|
#else
|
|
.bdrv_co_flush_to_disk = qemu_rbd_co_flush,
|
|
#endif
|
|
|
|
#ifdef LIBRBD_SUPPORTS_DISCARD
|
|
.bdrv_aio_discard = qemu_rbd_aio_discard,
|
|
#endif
|
|
|
|
.bdrv_snapshot_create = qemu_rbd_snap_create,
|
|
.bdrv_snapshot_delete = qemu_rbd_snap_remove,
|
|
.bdrv_snapshot_list = qemu_rbd_snap_list,
|
|
.bdrv_snapshot_goto = qemu_rbd_snap_rollback,
|
|
};
|
|
|
|
static void bdrv_rbd_init(void)
|
|
{
|
|
bdrv_register(&bdrv_rbd);
|
|
}
|
|
|
|
block_init(bdrv_rbd_init);
|