rbd / rados tends to return pretty often length of writes or discarded blocks. These values might be bigger than int. The steps to reproduce are: mkfs.xfs -f a whole device bigger than int in bytes. mkfs.xfs sends a discard. Important is that you use scsi-hd and set discard_granularity=512. Otherwise rbd disabled discard support. Signed-off-by: Stefan Priebe <s.priebe@profihost.ag> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
965 lines
24 KiB
C
965 lines
24 KiB
C
/*
|
|
* QEMU Block driver for RADOS (Ceph)
|
|
*
|
|
* 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
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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>
|
|
|
|
#include "qemu-common.h"
|
|
#include "qemu-error.h"
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|
#include "block_int.h"
|
|
|
|
#include <rbd/librbd.h>
|
|
|
|
/*
|
|
* When specifying the image filename use:
|
|
*
|
|
* rbd:poolname/devicename[@snapshotname][:option1=value1[:option2=value2...]]
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|
*
|
|
* poolname must be the name of an existing rados pool.
|
|
*
|
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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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* 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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|
*
|
|
* 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
|
|
* (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
|
|
* leading "\".
|
|
*/
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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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} 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 cancelled;
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} RBDAIOCB;
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|
|
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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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|
|
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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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int fds[2];
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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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int qemu_aio_count;
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char *snap;
|
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int event_reader_pos;
|
|
RADOSCB *event_rcb;
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|
} BDRVRBDState;
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|
|
|
static void rbd_aio_bh_cb(void *opaque);
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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)
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|
{
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|
int l;
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|
char *end;
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|
|
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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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|
if (*end == delim) {
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|
*p = end + 1;
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|
*end = '\0';
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|
}
|
|
}
|
|
l = strlen(src);
|
|
if (l >= dst_len) {
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error_report("%s too long", name);
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return -EINVAL;
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|
} else if (l == 0) {
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error_report("%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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|
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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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|
{
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|
const char *start;
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|
char *p, *buf;
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|
int ret;
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|
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|
if (!strstart(filename, "rbd:", &start)) {
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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, '/', "pool name", &p);
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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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|
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|
if (strchr(p, '@')) {
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ret = qemu_rbd_next_tok(name, name_len, p, '@', "object name", &p);
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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, ':', "snap name", &p);
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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, ':', "object name", &p);
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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, '\0', "configuration", &p);
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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)
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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);
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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_report("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);
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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_report("error reading conf file %s", value);
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|
break;
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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 {
|
|
ret = rados_conf_set(cluster, name, value);
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|
if (ret < 0) {
|
|
error_report("invalid conf option %s", name);
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|
ret = -EINVAL;
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|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
g_free(buf);
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|
return ret;
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|
}
|
|
|
|
static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
|
|
{
|
|
int64_t bytes = 0;
|
|
int64_t objsize;
|
|
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 conf[RBD_MAX_CONF_SIZE];
|
|
char clientname_buf[RBD_MAX_CONF_SIZE];
|
|
char *clientname;
|
|
rados_t cluster;
|
|
rados_ioctx_t io_ctx;
|
|
int ret;
|
|
|
|
if (qemu_rbd_parsename(filename, pool, sizeof(pool),
|
|
snap_buf, sizeof(snap_buf),
|
|
name, sizeof(name),
|
|
conf, sizeof(conf)) < 0) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
obj_order = ffs(objsize) - 1;
|
|
}
|
|
}
|
|
options++;
|
|
}
|
|
|
|
clientname = qemu_rbd_parse_clientname(conf, clientname_buf);
|
|
if (rados_create(&cluster, clientname) < 0) {
|
|
error_report("error initializing");
|
|
return -EIO;
|
|
}
|
|
|
|
if (strstr(conf, "conf=") == NULL) {
|
|
/* try default location, but ignore failure */
|
|
rados_conf_read_file(cluster, NULL);
|
|
}
|
|
|
|
if (conf[0] != '\0' &&
|
|
qemu_rbd_set_conf(cluster, conf) < 0) {
|
|
error_report("error setting config options");
|
|
rados_shutdown(cluster);
|
|
return -EIO;
|
|
}
|
|
|
|
if (rados_connect(cluster) < 0) {
|
|
error_report("error connecting");
|
|
rados_shutdown(cluster);
|
|
return -EIO;
|
|
}
|
|
|
|
if (rados_ioctx_create(cluster, pool, &io_ctx) < 0) {
|
|
error_report("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 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 qemu_rbd_complete_aio(RADOSCB *rcb)
|
|
{
|
|
RBDAIOCB *acb = rcb->acb;
|
|
int64_t r;
|
|
|
|
if (acb->cancelled) {
|
|
qemu_vfree(acb->bounce);
|
|
qemu_aio_release(acb);
|
|
goto done;
|
|
}
|
|
|
|
r = rcb->ret;
|
|
|
|
if (acb->cmd == RBD_AIO_WRITE ||
|
|
acb->cmd == RBD_AIO_DISCARD) {
|
|
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;
|
|
}
|
|
}
|
|
/* Note that acb->bh can be NULL in case where the aio was cancelled */
|
|
acb->bh = qemu_bh_new(rbd_aio_bh_cb, acb);
|
|
qemu_bh_schedule(acb->bh);
|
|
done:
|
|
g_free(rcb);
|
|
}
|
|
|
|
/*
|
|
* aio fd read handler. It runs in the qemu context and calls the
|
|
* completion handling of completed rados aio operations.
|
|
*/
|
|
static void qemu_rbd_aio_event_reader(void *opaque)
|
|
{
|
|
BDRVRBDState *s = opaque;
|
|
|
|
ssize_t ret;
|
|
|
|
do {
|
|
char *p = (char *)&s->event_rcb;
|
|
|
|
/* now read the rcb pointer that was sent from a non qemu thread */
|
|
ret = read(s->fds[RBD_FD_READ], p + s->event_reader_pos,
|
|
sizeof(s->event_rcb) - s->event_reader_pos);
|
|
if (ret > 0) {
|
|
s->event_reader_pos += ret;
|
|
if (s->event_reader_pos == sizeof(s->event_rcb)) {
|
|
s->event_reader_pos = 0;
|
|
qemu_rbd_complete_aio(s->event_rcb);
|
|
s->qemu_aio_count--;
|
|
}
|
|
}
|
|
} while (ret < 0 && errno == EINTR);
|
|
}
|
|
|
|
static int qemu_rbd_aio_flush_cb(void *opaque)
|
|
{
|
|
BDRVRBDState *s = opaque;
|
|
|
|
return (s->qemu_aio_count > 0);
|
|
}
|
|
|
|
static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags)
|
|
{
|
|
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;
|
|
int r;
|
|
|
|
if (qemu_rbd_parsename(filename, pool, sizeof(pool),
|
|
snap_buf, sizeof(snap_buf),
|
|
s->name, sizeof(s->name),
|
|
conf, sizeof(conf)) < 0) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
clientname = qemu_rbd_parse_clientname(conf, clientname_buf);
|
|
r = rados_create(&s->cluster, clientname);
|
|
if (r < 0) {
|
|
error_report("error initializing");
|
|
return r;
|
|
}
|
|
|
|
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);
|
|
if (r < 0) {
|
|
error_report("error setting config options");
|
|
goto failed_shutdown;
|
|
}
|
|
}
|
|
|
|
r = rados_connect(s->cluster);
|
|
if (r < 0) {
|
|
error_report("error connecting");
|
|
goto failed_shutdown;
|
|
}
|
|
|
|
r = rados_ioctx_create(s->cluster, pool, &s->io_ctx);
|
|
if (r < 0) {
|
|
error_report("error opening pool %s", pool);
|
|
goto failed_shutdown;
|
|
}
|
|
|
|
r = rbd_open(s->io_ctx, s->name, &s->image, s->snap);
|
|
if (r < 0) {
|
|
error_report("error reading header from %s", s->name);
|
|
goto failed_open;
|
|
}
|
|
|
|
bs->read_only = (s->snap != NULL);
|
|
|
|
s->event_reader_pos = 0;
|
|
r = qemu_pipe(s->fds);
|
|
if (r < 0) {
|
|
error_report("error opening eventfd");
|
|
goto failed;
|
|
}
|
|
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], qemu_rbd_aio_event_reader,
|
|
NULL, qemu_rbd_aio_flush_cb, s);
|
|
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
rbd_close(s->image);
|
|
failed_open:
|
|
rados_ioctx_destroy(s->io_ctx);
|
|
failed_shutdown:
|
|
rados_shutdown(s->cluster);
|
|
g_free(s->snap);
|
|
return r;
|
|
}
|
|
|
|
static void qemu_rbd_close(BlockDriverState *bs)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
|
|
close(s->fds[0]);
|
|
close(s->fds[1]);
|
|
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL, NULL);
|
|
|
|
rbd_close(s->image);
|
|
rados_ioctx_destroy(s->io_ctx);
|
|
g_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 qemu_rbd_aio_cancel(BlockDriverAIOCB *blockacb)
|
|
{
|
|
RBDAIOCB *acb = (RBDAIOCB *) blockacb;
|
|
acb->cancelled = 1;
|
|
}
|
|
|
|
static const AIOCBInfo rbd_aiocb_info = {
|
|
.aiocb_size = sizeof(RBDAIOCB),
|
|
.cancel = qemu_rbd_aio_cancel,
|
|
};
|
|
|
|
static int qemu_rbd_send_pipe(BDRVRBDState *s, RADOSCB *rcb)
|
|
{
|
|
int ret = 0;
|
|
while (1) {
|
|
fd_set wfd;
|
|
int fd = s->fds[RBD_FD_WRITE];
|
|
|
|
/* 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);
|
|
do {
|
|
ret = select(fd + 1, NULL, &wfd, NULL, NULL);
|
|
} 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");
|
|
g_free(rcb);
|
|
}
|
|
}
|
|
|
|
/* Callback when all queued rbd_aio requests are complete */
|
|
|
|
static void rbd_aio_bh_cb(void *opaque)
|
|
{
|
|
RBDAIOCB *acb = opaque;
|
|
|
|
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));
|
|
qemu_bh_delete(acb->bh);
|
|
acb->bh = NULL;
|
|
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
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 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;
|
|
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) {
|
|
acb->bounce = NULL;
|
|
} else {
|
|
acb->bounce = qemu_blockalign(bs, qiov->size);
|
|
}
|
|
acb->ret = 0;
|
|
acb->error = 0;
|
|
acb->s = s;
|
|
acb->cancelled = 0;
|
|
acb->bh = NULL;
|
|
|
|
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;
|
|
|
|
s->qemu_aio_count++; /* All the RADOSCB */
|
|
|
|
rcb = g_malloc(sizeof(RADOSCB));
|
|
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;
|
|
default:
|
|
r = -EINVAL;
|
|
}
|
|
|
|
if (r < 0) {
|
|
goto failed;
|
|
}
|
|
|
|
return &acb->common;
|
|
|
|
failed:
|
|
g_free(rcb);
|
|
s->qemu_aio_count--;
|
|
qemu_aio_release(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);
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
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_name)
|
|
{
|
|
BDRVRBDState *s = bs->opaque;
|
|
int r;
|
|
|
|
r = rbd_snap_remove(s->image, snapshot_name);
|
|
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_malloc(sizeof(*snaps) * 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_malloc0(snap_count * sizeof(QEMUSnapshotInfo));
|
|
|
|
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);
|
|
|
|
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 QEMUOptionParameter qemu_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 = 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,
|
|
.bdrv_truncate = qemu_rbd_truncate,
|
|
.protocol_name = "rbd",
|
|
|
|
.bdrv_aio_readv = qemu_rbd_aio_readv,
|
|
.bdrv_aio_writev = qemu_rbd_aio_writev,
|
|
.bdrv_co_flush_to_disk = qemu_rbd_co_flush,
|
|
|
|
#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);
|