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/*
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---|---|
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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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*/
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#include <inttypes.h> |
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#include "qemu-common.h" |
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#include "qemu-error.h" |
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#include "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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#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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|
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typedef struct RBDAIOCB { |
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BlockDriverAIOCB common; |
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QEMUBH *bh; |
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int ret;
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QEMUIOVector *qiov; |
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char *bounce;
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int write;
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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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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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int ret;
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} RADOSCB; |
76 |
|
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#define RBD_FD_READ 0 |
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#define RBD_FD_WRITE 1 |
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|
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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;
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RADOSCB *event_rcb; |
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} BDRVRBDState; |
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static void rbd_aio_bh_cb(void *opaque); |
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|
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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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*p = NULL;
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if (delim != '\0') { |
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end = strchr(src, delim); |
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if (end) {
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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_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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|
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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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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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|
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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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} 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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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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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); |
223 |
if (ret < 0) { |
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break;
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} |
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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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} |
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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_report("invalid conf option %s", name);
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ret = -EINVAL; |
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break;
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} |
242 |
} |
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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, QEMUOptionParameter *options) |
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{ |
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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)) < 0) { |
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return -EINVAL;
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} |
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/* Read out options */
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while (options && options->name) {
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if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
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bytes = options->value.n; |
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} else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
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if (options->value.n) {
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objsize = options->value.n; |
278 |
if ((objsize - 1) & objsize) { /* not a power of 2? */ |
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error_report("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_report("obj size too small");
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return -EINVAL;
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} |
286 |
obj_order = ffs(objsize) - 1;
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} |
288 |
} |
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options++; |
290 |
} |
291 |
|
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clientname = qemu_rbd_parse_clientname(conf, clientname_buf); |
293 |
if (rados_create(&cluster, clientname) < 0) { |
294 |
error_report("error initializing");
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return -EIO;
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} |
297 |
|
298 |
if (strstr(conf, "conf=") == NULL) { |
299 |
/* try default location, but ignore failure */
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rados_conf_read_file(cluster, NULL);
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} |
302 |
|
303 |
if (conf[0] != '\0' && |
304 |
qemu_rbd_set_conf(cluster, conf) < 0) {
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305 |
error_report("error setting config options");
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306 |
rados_shutdown(cluster); |
307 |
return -EIO;
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308 |
} |
309 |
|
310 |
if (rados_connect(cluster) < 0) { |
311 |
error_report("error connecting");
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rados_shutdown(cluster); |
313 |
return -EIO;
|
314 |
} |
315 |
|
316 |
if (rados_ioctx_create(cluster, pool, &io_ctx) < 0) { |
317 |
error_report("error opening pool %s", pool);
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318 |
rados_shutdown(cluster); |
319 |
return -EIO;
|
320 |
} |
321 |
|
322 |
ret = rbd_create(io_ctx, name, bytes, &obj_order); |
323 |
rados_ioctx_destroy(io_ctx); |
324 |
rados_shutdown(cluster); |
325 |
|
326 |
return ret;
|
327 |
} |
328 |
|
329 |
/*
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330 |
* This aio completion is being called from qemu_rbd_aio_event_reader()
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331 |
* and runs in qemu context. It schedules a bh, but just in case the aio
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332 |
* was not cancelled before.
|
333 |
*/
|
334 |
static void qemu_rbd_complete_aio(RADOSCB *rcb) |
335 |
{ |
336 |
RBDAIOCB *acb = rcb->acb; |
337 |
int64_t r; |
338 |
|
339 |
if (acb->cancelled) {
|
340 |
qemu_vfree(acb->bounce); |
341 |
qemu_aio_release(acb); |
342 |
goto done;
|
343 |
} |
344 |
|
345 |
r = rcb->ret; |
346 |
|
347 |
if (acb->write) {
|
348 |
if (r < 0) { |
349 |
acb->ret = r; |
350 |
acb->error = 1;
|
351 |
} else if (!acb->error) { |
352 |
acb->ret = rcb->size; |
353 |
} |
354 |
} else {
|
355 |
if (r < 0) { |
356 |
memset(rcb->buf, 0, rcb->size);
|
357 |
acb->ret = r; |
358 |
acb->error = 1;
|
359 |
} else if (r < rcb->size) { |
360 |
memset(rcb->buf + r, 0, rcb->size - r);
|
361 |
if (!acb->error) {
|
362 |
acb->ret = rcb->size; |
363 |
} |
364 |
} else if (!acb->error) { |
365 |
acb->ret = r; |
366 |
} |
367 |
} |
368 |
/* Note that acb->bh can be NULL in case where the aio was cancelled */
|
369 |
acb->bh = qemu_bh_new(rbd_aio_bh_cb, acb); |
370 |
qemu_bh_schedule(acb->bh); |
371 |
done:
|
372 |
g_free(rcb); |
373 |
} |
374 |
|
375 |
/*
|
376 |
* aio fd read handler. It runs in the qemu context and calls the
|
377 |
* completion handling of completed rados aio operations.
|
378 |
*/
|
379 |
static void qemu_rbd_aio_event_reader(void *opaque) |
380 |
{ |
381 |
BDRVRBDState *s = opaque; |
382 |
|
383 |
ssize_t ret; |
384 |
|
385 |
do {
|
386 |
char *p = (char *)&s->event_rcb; |
387 |
|
388 |
/* now read the rcb pointer that was sent from a non qemu thread */
|
389 |
ret = read(s->fds[RBD_FD_READ], p + s->event_reader_pos, |
390 |
sizeof(s->event_rcb) - s->event_reader_pos);
|
391 |
if (ret > 0) { |
392 |
s->event_reader_pos += ret; |
393 |
if (s->event_reader_pos == sizeof(s->event_rcb)) { |
394 |
s->event_reader_pos = 0;
|
395 |
qemu_rbd_complete_aio(s->event_rcb); |
396 |
s->qemu_aio_count--; |
397 |
} |
398 |
} |
399 |
} while (ret < 0 && errno == EINTR); |
400 |
} |
401 |
|
402 |
static int qemu_rbd_aio_flush_cb(void *opaque) |
403 |
{ |
404 |
BDRVRBDState *s = opaque; |
405 |
|
406 |
return (s->qemu_aio_count > 0); |
407 |
} |
408 |
|
409 |
static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags) |
410 |
{ |
411 |
BDRVRBDState *s = bs->opaque; |
412 |
char pool[RBD_MAX_POOL_NAME_SIZE];
|
413 |
char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
|
414 |
char conf[RBD_MAX_CONF_SIZE];
|
415 |
char clientname_buf[RBD_MAX_CONF_SIZE];
|
416 |
char *clientname;
|
417 |
int r;
|
418 |
|
419 |
if (qemu_rbd_parsename(filename, pool, sizeof(pool), |
420 |
snap_buf, sizeof(snap_buf),
|
421 |
s->name, sizeof(s->name),
|
422 |
conf, sizeof(conf)) < 0) { |
423 |
return -EINVAL;
|
424 |
} |
425 |
|
426 |
clientname = qemu_rbd_parse_clientname(conf, clientname_buf); |
427 |
r = rados_create(&s->cluster, clientname); |
428 |
if (r < 0) { |
429 |
error_report("error initializing");
|
430 |
return r;
|
431 |
} |
432 |
|
433 |
s->snap = NULL;
|
434 |
if (snap_buf[0] != '\0') { |
435 |
s->snap = g_strdup(snap_buf); |
436 |
} |
437 |
|
438 |
if (strstr(conf, "conf=") == NULL) { |
439 |
/* try default location, but ignore failure */
|
440 |
rados_conf_read_file(s->cluster, NULL);
|
441 |
} |
442 |
|
443 |
if (conf[0] != '\0') { |
444 |
r = qemu_rbd_set_conf(s->cluster, conf); |
445 |
if (r < 0) { |
446 |
error_report("error setting config options");
|
447 |
goto failed_shutdown;
|
448 |
} |
449 |
} |
450 |
|
451 |
r = rados_connect(s->cluster); |
452 |
if (r < 0) { |
453 |
error_report("error connecting");
|
454 |
goto failed_shutdown;
|
455 |
} |
456 |
|
457 |
r = rados_ioctx_create(s->cluster, pool, &s->io_ctx); |
458 |
if (r < 0) { |
459 |
error_report("error opening pool %s", pool);
|
460 |
goto failed_shutdown;
|
461 |
} |
462 |
|
463 |
r = rbd_open(s->io_ctx, s->name, &s->image, s->snap); |
464 |
if (r < 0) { |
465 |
error_report("error reading header from %s", s->name);
|
466 |
goto failed_open;
|
467 |
} |
468 |
|
469 |
bs->read_only = (s->snap != NULL);
|
470 |
|
471 |
s->event_reader_pos = 0;
|
472 |
r = qemu_pipe(s->fds); |
473 |
if (r < 0) { |
474 |
error_report("error opening eventfd");
|
475 |
goto failed;
|
476 |
} |
477 |
fcntl(s->fds[0], F_SETFL, O_NONBLOCK);
|
478 |
fcntl(s->fds[1], F_SETFL, O_NONBLOCK);
|
479 |
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader, |
480 |
NULL, qemu_rbd_aio_flush_cb, NULL, s); |
481 |
|
482 |
|
483 |
return 0; |
484 |
|
485 |
failed:
|
486 |
rbd_close(s->image); |
487 |
failed_open:
|
488 |
rados_ioctx_destroy(s->io_ctx); |
489 |
failed_shutdown:
|
490 |
rados_shutdown(s->cluster); |
491 |
g_free(s->snap); |
492 |
return r;
|
493 |
} |
494 |
|
495 |
static void qemu_rbd_close(BlockDriverState *bs) |
496 |
{ |
497 |
BDRVRBDState *s = bs->opaque; |
498 |
|
499 |
close(s->fds[0]);
|
500 |
close(s->fds[1]);
|
501 |
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL , NULL, NULL, NULL, |
502 |
NULL);
|
503 |
|
504 |
rbd_close(s->image); |
505 |
rados_ioctx_destroy(s->io_ctx); |
506 |
g_free(s->snap); |
507 |
rados_shutdown(s->cluster); |
508 |
} |
509 |
|
510 |
/*
|
511 |
* Cancel aio. Since we don't reference acb in a non qemu threads,
|
512 |
* it is safe to access it here.
|
513 |
*/
|
514 |
static void qemu_rbd_aio_cancel(BlockDriverAIOCB *blockacb) |
515 |
{ |
516 |
RBDAIOCB *acb = (RBDAIOCB *) blockacb; |
517 |
acb->cancelled = 1;
|
518 |
} |
519 |
|
520 |
static AIOPool rbd_aio_pool = {
|
521 |
.aiocb_size = sizeof(RBDAIOCB),
|
522 |
.cancel = qemu_rbd_aio_cancel, |
523 |
}; |
524 |
|
525 |
static int qemu_rbd_send_pipe(BDRVRBDState *s, RADOSCB *rcb) |
526 |
{ |
527 |
int ret = 0; |
528 |
while (1) { |
529 |
fd_set wfd; |
530 |
int fd = s->fds[RBD_FD_WRITE];
|
531 |
|
532 |
/* send the op pointer to the qemu thread that is responsible
|
533 |
for the aio/op completion. Must do it in a qemu thread context */
|
534 |
ret = write(fd, (void *)&rcb, sizeof(rcb)); |
535 |
if (ret >= 0) { |
536 |
break;
|
537 |
} |
538 |
if (errno == EINTR) {
|
539 |
continue;
|
540 |
} |
541 |
if (errno != EAGAIN) {
|
542 |
break;
|
543 |
} |
544 |
|
545 |
FD_ZERO(&wfd); |
546 |
FD_SET(fd, &wfd); |
547 |
do {
|
548 |
ret = select(fd + 1, NULL, &wfd, NULL, NULL); |
549 |
} while (ret < 0 && errno == EINTR); |
550 |
} |
551 |
|
552 |
return ret;
|
553 |
} |
554 |
|
555 |
/*
|
556 |
* This is the callback function for rbd_aio_read and _write
|
557 |
*
|
558 |
* Note: this function is being called from a non qemu thread so
|
559 |
* we need to be careful about what we do here. Generally we only
|
560 |
* write to the block notification pipe, and do the rest of the
|
561 |
* io completion handling from qemu_rbd_aio_event_reader() which
|
562 |
* runs in a qemu context.
|
563 |
*/
|
564 |
static void rbd_finish_aiocb(rbd_completion_t c, RADOSCB *rcb) |
565 |
{ |
566 |
int ret;
|
567 |
rcb->ret = rbd_aio_get_return_value(c); |
568 |
rbd_aio_release(c); |
569 |
ret = qemu_rbd_send_pipe(rcb->s, rcb); |
570 |
if (ret < 0) { |
571 |
error_report("failed writing to acb->s->fds");
|
572 |
g_free(rcb); |
573 |
} |
574 |
} |
575 |
|
576 |
/* Callback when all queued rbd_aio requests are complete */
|
577 |
|
578 |
static void rbd_aio_bh_cb(void *opaque) |
579 |
{ |
580 |
RBDAIOCB *acb = opaque; |
581 |
|
582 |
if (!acb->write) {
|
583 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
584 |
} |
585 |
qemu_vfree(acb->bounce); |
586 |
acb->common.cb(acb->common.opaque, (acb->ret > 0 ? 0 : acb->ret)); |
587 |
qemu_bh_delete(acb->bh); |
588 |
acb->bh = NULL;
|
589 |
|
590 |
qemu_aio_release(acb); |
591 |
} |
592 |
|
593 |
static BlockDriverAIOCB *rbd_aio_rw_vector(BlockDriverState *bs,
|
594 |
int64_t sector_num, |
595 |
QEMUIOVector *qiov, |
596 |
int nb_sectors,
|
597 |
BlockDriverCompletionFunc *cb, |
598 |
void *opaque, int write) |
599 |
{ |
600 |
RBDAIOCB *acb; |
601 |
RADOSCB *rcb; |
602 |
rbd_completion_t c; |
603 |
int64_t off, size; |
604 |
char *buf;
|
605 |
int r;
|
606 |
|
607 |
BDRVRBDState *s = bs->opaque; |
608 |
|
609 |
acb = qemu_aio_get(&rbd_aio_pool, bs, cb, opaque); |
610 |
if (!acb) {
|
611 |
return NULL; |
612 |
} |
613 |
acb->write = write; |
614 |
acb->qiov = qiov; |
615 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
616 |
acb->ret = 0;
|
617 |
acb->error = 0;
|
618 |
acb->s = s; |
619 |
acb->cancelled = 0;
|
620 |
acb->bh = NULL;
|
621 |
|
622 |
if (write) {
|
623 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
624 |
} |
625 |
|
626 |
buf = acb->bounce; |
627 |
|
628 |
off = sector_num * BDRV_SECTOR_SIZE; |
629 |
size = nb_sectors * BDRV_SECTOR_SIZE; |
630 |
|
631 |
s->qemu_aio_count++; /* All the RADOSCB */
|
632 |
|
633 |
rcb = g_malloc(sizeof(RADOSCB));
|
634 |
rcb->done = 0;
|
635 |
rcb->acb = acb; |
636 |
rcb->buf = buf; |
637 |
rcb->s = acb->s; |
638 |
rcb->size = size; |
639 |
r = rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c); |
640 |
if (r < 0) { |
641 |
goto failed;
|
642 |
} |
643 |
|
644 |
if (write) {
|
645 |
r = rbd_aio_write(s->image, off, size, buf, c); |
646 |
} else {
|
647 |
r = rbd_aio_read(s->image, off, size, buf, c); |
648 |
} |
649 |
|
650 |
if (r < 0) { |
651 |
goto failed;
|
652 |
} |
653 |
|
654 |
return &acb->common;
|
655 |
|
656 |
failed:
|
657 |
g_free(rcb); |
658 |
s->qemu_aio_count--; |
659 |
qemu_aio_release(acb); |
660 |
return NULL; |
661 |
} |
662 |
|
663 |
static BlockDriverAIOCB *qemu_rbd_aio_readv(BlockDriverState *bs,
|
664 |
int64_t sector_num, |
665 |
QEMUIOVector *qiov, |
666 |
int nb_sectors,
|
667 |
BlockDriverCompletionFunc *cb, |
668 |
void *opaque)
|
669 |
{ |
670 |
return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
671 |
} |
672 |
|
673 |
static BlockDriverAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
|
674 |
int64_t sector_num, |
675 |
QEMUIOVector *qiov, |
676 |
int nb_sectors,
|
677 |
BlockDriverCompletionFunc *cb, |
678 |
void *opaque)
|
679 |
{ |
680 |
return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
681 |
} |
682 |
|
683 |
static int qemu_rbd_flush(BlockDriverState *bs) |
684 |
{ |
685 |
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 1) |
686 |
/* rbd_flush added in 0.1.1 */
|
687 |
BDRVRBDState *s = bs->opaque; |
688 |
return rbd_flush(s->image);
|
689 |
#else
|
690 |
return 0; |
691 |
#endif
|
692 |
} |
693 |
|
694 |
static int qemu_rbd_getinfo(BlockDriverState *bs, BlockDriverInfo *bdi) |
695 |
{ |
696 |
BDRVRBDState *s = bs->opaque; |
697 |
rbd_image_info_t info; |
698 |
int r;
|
699 |
|
700 |
r = rbd_stat(s->image, &info, sizeof(info));
|
701 |
if (r < 0) { |
702 |
return r;
|
703 |
} |
704 |
|
705 |
bdi->cluster_size = info.obj_size; |
706 |
return 0; |
707 |
} |
708 |
|
709 |
static int64_t qemu_rbd_getlength(BlockDriverState *bs)
|
710 |
{ |
711 |
BDRVRBDState *s = bs->opaque; |
712 |
rbd_image_info_t info; |
713 |
int r;
|
714 |
|
715 |
r = rbd_stat(s->image, &info, sizeof(info));
|
716 |
if (r < 0) { |
717 |
return r;
|
718 |
} |
719 |
|
720 |
return info.size;
|
721 |
} |
722 |
|
723 |
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset) |
724 |
{ |
725 |
BDRVRBDState *s = bs->opaque; |
726 |
int r;
|
727 |
|
728 |
r = rbd_resize(s->image, offset); |
729 |
if (r < 0) { |
730 |
return r;
|
731 |
} |
732 |
|
733 |
return 0; |
734 |
} |
735 |
|
736 |
static int qemu_rbd_snap_create(BlockDriverState *bs, |
737 |
QEMUSnapshotInfo *sn_info) |
738 |
{ |
739 |
BDRVRBDState *s = bs->opaque; |
740 |
int r;
|
741 |
|
742 |
if (sn_info->name[0] == '\0') { |
743 |
return -EINVAL; /* we need a name for rbd snapshots */ |
744 |
} |
745 |
|
746 |
/*
|
747 |
* rbd snapshots are using the name as the user controlled unique identifier
|
748 |
* we can't use the rbd snapid for that purpose, as it can't be set
|
749 |
*/
|
750 |
if (sn_info->id_str[0] != '\0' && |
751 |
strcmp(sn_info->id_str, sn_info->name) != 0) {
|
752 |
return -EINVAL;
|
753 |
} |
754 |
|
755 |
if (strlen(sn_info->name) >= sizeof(sn_info->id_str)) { |
756 |
return -ERANGE;
|
757 |
} |
758 |
|
759 |
r = rbd_snap_create(s->image, sn_info->name); |
760 |
if (r < 0) { |
761 |
error_report("failed to create snap: %s", strerror(-r));
|
762 |
return r;
|
763 |
} |
764 |
|
765 |
return 0; |
766 |
} |
767 |
|
768 |
static int qemu_rbd_snap_list(BlockDriverState *bs, |
769 |
QEMUSnapshotInfo **psn_tab) |
770 |
{ |
771 |
BDRVRBDState *s = bs->opaque; |
772 |
QEMUSnapshotInfo *sn_info, *sn_tab = NULL;
|
773 |
int i, snap_count;
|
774 |
rbd_snap_info_t *snaps; |
775 |
int max_snaps = RBD_MAX_SNAPS;
|
776 |
|
777 |
do {
|
778 |
snaps = g_malloc(sizeof(*snaps) * max_snaps);
|
779 |
snap_count = rbd_snap_list(s->image, snaps, &max_snaps); |
780 |
if (snap_count < 0) { |
781 |
g_free(snaps); |
782 |
} |
783 |
} while (snap_count == -ERANGE);
|
784 |
|
785 |
if (snap_count <= 0) { |
786 |
return snap_count;
|
787 |
} |
788 |
|
789 |
sn_tab = g_malloc0(snap_count * sizeof(QEMUSnapshotInfo));
|
790 |
|
791 |
for (i = 0; i < snap_count; i++) { |
792 |
const char *snap_name = snaps[i].name; |
793 |
|
794 |
sn_info = sn_tab + i; |
795 |
pstrcpy(sn_info->id_str, sizeof(sn_info->id_str), snap_name);
|
796 |
pstrcpy(sn_info->name, sizeof(sn_info->name), snap_name);
|
797 |
|
798 |
sn_info->vm_state_size = snaps[i].size; |
799 |
sn_info->date_sec = 0;
|
800 |
sn_info->date_nsec = 0;
|
801 |
sn_info->vm_clock_nsec = 0;
|
802 |
} |
803 |
rbd_snap_list_end(snaps); |
804 |
|
805 |
*psn_tab = sn_tab; |
806 |
return snap_count;
|
807 |
} |
808 |
|
809 |
static QEMUOptionParameter qemu_rbd_create_options[] = {
|
810 |
{ |
811 |
.name = BLOCK_OPT_SIZE, |
812 |
.type = OPT_SIZE, |
813 |
.help = "Virtual disk size"
|
814 |
}, |
815 |
{ |
816 |
.name = BLOCK_OPT_CLUSTER_SIZE, |
817 |
.type = OPT_SIZE, |
818 |
.help = "RBD object size"
|
819 |
}, |
820 |
{NULL}
|
821 |
}; |
822 |
|
823 |
static BlockDriver bdrv_rbd = {
|
824 |
.format_name = "rbd",
|
825 |
.instance_size = sizeof(BDRVRBDState),
|
826 |
.bdrv_file_open = qemu_rbd_open, |
827 |
.bdrv_close = qemu_rbd_close, |
828 |
.bdrv_create = qemu_rbd_create, |
829 |
.bdrv_flush = qemu_rbd_flush, |
830 |
.bdrv_get_info = qemu_rbd_getinfo, |
831 |
.create_options = qemu_rbd_create_options, |
832 |
.bdrv_getlength = qemu_rbd_getlength, |
833 |
.bdrv_truncate = qemu_rbd_truncate, |
834 |
.protocol_name = "rbd",
|
835 |
|
836 |
.bdrv_aio_readv = qemu_rbd_aio_readv, |
837 |
.bdrv_aio_writev = qemu_rbd_aio_writev, |
838 |
|
839 |
.bdrv_snapshot_create = qemu_rbd_snap_create, |
840 |
.bdrv_snapshot_list = qemu_rbd_snap_list, |
841 |
}; |
842 |
|
843 |
static void bdrv_rbd_init(void) |
844 |
{ |
845 |
bdrv_register(&bdrv_rbd); |
846 |
} |
847 |
|
848 |
block_init(bdrv_rbd_init); |