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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> |
13 |
|
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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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|
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#define RBD_MAX_CONF_NAME_SIZE 128 |
48 |
#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 { |
55 |
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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|
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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 |
79 |
|
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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; |
91 |
|
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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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|
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*p = NULL;
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|
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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_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); |
128 |
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return 0; |
130 |
} |
131 |
|
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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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|
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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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} |
144 |
|
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static int qemu_rbd_parsename(const char *filename, |
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char *pool, int pool_len, |
147 |
char *snap, int snap_len, |
148 |
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; |
152 |
char *p, *buf;
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int ret;
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154 |
|
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if (!strstart(filename, "rbd:", &start)) { |
156 |
return -EINVAL;
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} |
158 |
|
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buf = g_strdup(start); |
160 |
p = buf; |
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*snap = '\0';
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*conf = '\0';
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|
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ret = qemu_rbd_next_tok(pool, pool_len, p, '/', "pool name", &p); |
165 |
if (ret < 0 || !p) { |
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ret = -EINVAL; |
167 |
goto done;
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} |
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qemu_rbd_unescape(pool); |
170 |
|
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if (strchr(p, '@')) { |
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ret = qemu_rbd_next_tok(name, name_len, p, '@', "object name", &p); |
173 |
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); |
178 |
} else {
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ret = qemu_rbd_next_tok(name, name_len, p, ':', "object name", &p); |
180 |
} |
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qemu_rbd_unescape(name); |
182 |
if (ret < 0 || !p) { |
183 |
goto done;
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} |
185 |
|
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ret = qemu_rbd_next_tok(conf, conf_len, p, '\0', "configuration", &p); |
187 |
|
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done:
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g_free(buf); |
190 |
return ret;
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} |
192 |
|
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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; |
196 |
|
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while (*p) {
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int len;
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const char *end = strchr(p, ':'); |
200 |
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if (end) {
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len = end - p; |
203 |
} else {
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len = strlen(p); |
205 |
} |
206 |
|
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if (strncmp(p, "id=", 3) == 0) { |
208 |
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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212 |
} |
213 |
if (end == NULL) { |
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break;
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} |
216 |
p = end + 1;
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} |
218 |
return NULL; |
219 |
} |
220 |
|
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static int qemu_rbd_set_conf(rados_t cluster, const char *conf) |
222 |
{ |
223 |
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; |
227 |
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buf = g_strdup(conf); |
229 |
p = buf; |
230 |
|
231 |
while (p) {
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ret = qemu_rbd_next_tok(name, sizeof(name), p,
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'=', "conf option name", &p); |
234 |
if (ret < 0) { |
235 |
break;
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} |
237 |
qemu_rbd_unescape(name); |
238 |
|
239 |
if (!p) {
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error_report("conf option %s has no value", name);
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ret = -EINVAL; |
242 |
break;
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243 |
} |
244 |
|
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ret = qemu_rbd_next_tok(value, sizeof(value), p,
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':', "conf option value", &p); |
247 |
if (ret < 0) { |
248 |
break;
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249 |
} |
250 |
qemu_rbd_unescape(value); |
251 |
|
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if (strcmp(name, "conf") == 0) { |
253 |
ret = rados_conf_read_file(cluster, value); |
254 |
if (ret < 0) { |
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error_report("error reading conf file %s", value);
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break;
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} |
258 |
} else if (strcmp(name, "id") == 0) { |
259 |
/* 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); |
262 |
if (ret < 0) { |
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error_report("invalid conf option %s", name);
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ret = -EINVAL; |
265 |
break;
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} |
267 |
} |
268 |
} |
269 |
|
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g_free(buf); |
271 |
return ret;
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} |
273 |
|
274 |
static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options) |
275 |
{ |
276 |
int64_t bytes = 0;
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int64_t objsize; |
278 |
int obj_order = 0; |
279 |
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; |
286 |
rados_ioctx_t io_ctx; |
287 |
int ret;
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288 |
|
289 |
if (qemu_rbd_parsename(filename, pool, sizeof(pool), |
290 |
snap_buf, sizeof(snap_buf),
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name, sizeof(name),
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conf, sizeof(conf)) < 0) { |
293 |
return -EINVAL;
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294 |
} |
295 |
|
296 |
/* Read out options */
|
297 |
while (options && options->name) {
|
298 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
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299 |
bytes = options->value.n; |
300 |
} else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
301 |
if (options->value.n) {
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302 |
objsize = options->value.n; |
303 |
if ((objsize - 1) & objsize) { /* not a power of 2? */ |
304 |
error_report("obj size needs to be power of 2");
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305 |
return -EINVAL;
|
306 |
} |
307 |
if (objsize < 4096) { |
308 |
error_report("obj size too small");
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309 |
return -EINVAL;
|
310 |
} |
311 |
obj_order = ffs(objsize) - 1;
|
312 |
} |
313 |
} |
314 |
options++; |
315 |
} |
316 |
|
317 |
clientname = qemu_rbd_parse_clientname(conf, clientname_buf); |
318 |
if (rados_create(&cluster, clientname) < 0) { |
319 |
error_report("error initializing");
|
320 |
return -EIO;
|
321 |
} |
322 |
|
323 |
if (strstr(conf, "conf=") == NULL) { |
324 |
/* try default location, but ignore failure */
|
325 |
rados_conf_read_file(cluster, NULL);
|
326 |
} |
327 |
|
328 |
if (conf[0] != '\0' && |
329 |
qemu_rbd_set_conf(cluster, conf) < 0) {
|
330 |
error_report("error setting config options");
|
331 |
rados_shutdown(cluster); |
332 |
return -EIO;
|
333 |
} |
334 |
|
335 |
if (rados_connect(cluster) < 0) { |
336 |
error_report("error connecting");
|
337 |
rados_shutdown(cluster); |
338 |
return -EIO;
|
339 |
} |
340 |
|
341 |
if (rados_ioctx_create(cluster, pool, &io_ctx) < 0) { |
342 |
error_report("error opening pool %s", pool);
|
343 |
rados_shutdown(cluster); |
344 |
return -EIO;
|
345 |
} |
346 |
|
347 |
ret = rbd_create(io_ctx, name, bytes, &obj_order); |
348 |
rados_ioctx_destroy(io_ctx); |
349 |
rados_shutdown(cluster); |
350 |
|
351 |
return ret;
|
352 |
} |
353 |
|
354 |
/*
|
355 |
* This aio completion is being called from qemu_rbd_aio_event_reader()
|
356 |
* and runs in qemu context. It schedules a bh, but just in case the aio
|
357 |
* was not cancelled before.
|
358 |
*/
|
359 |
static void qemu_rbd_complete_aio(RADOSCB *rcb) |
360 |
{ |
361 |
RBDAIOCB *acb = rcb->acb; |
362 |
int64_t r; |
363 |
|
364 |
if (acb->cancelled) {
|
365 |
qemu_vfree(acb->bounce); |
366 |
qemu_aio_release(acb); |
367 |
goto done;
|
368 |
} |
369 |
|
370 |
r = rcb->ret; |
371 |
|
372 |
if (acb->write) {
|
373 |
if (r < 0) { |
374 |
acb->ret = r; |
375 |
acb->error = 1;
|
376 |
} else if (!acb->error) { |
377 |
acb->ret = rcb->size; |
378 |
} |
379 |
} else {
|
380 |
if (r < 0) { |
381 |
memset(rcb->buf, 0, rcb->size);
|
382 |
acb->ret = r; |
383 |
acb->error = 1;
|
384 |
} else if (r < rcb->size) { |
385 |
memset(rcb->buf + r, 0, rcb->size - r);
|
386 |
if (!acb->error) {
|
387 |
acb->ret = rcb->size; |
388 |
} |
389 |
} else if (!acb->error) { |
390 |
acb->ret = r; |
391 |
} |
392 |
} |
393 |
/* Note that acb->bh can be NULL in case where the aio was cancelled */
|
394 |
acb->bh = qemu_bh_new(rbd_aio_bh_cb, acb); |
395 |
qemu_bh_schedule(acb->bh); |
396 |
done:
|
397 |
g_free(rcb); |
398 |
} |
399 |
|
400 |
/*
|
401 |
* aio fd read handler. It runs in the qemu context and calls the
|
402 |
* completion handling of completed rados aio operations.
|
403 |
*/
|
404 |
static void qemu_rbd_aio_event_reader(void *opaque) |
405 |
{ |
406 |
BDRVRBDState *s = opaque; |
407 |
|
408 |
ssize_t ret; |
409 |
|
410 |
do {
|
411 |
char *p = (char *)&s->event_rcb; |
412 |
|
413 |
/* now read the rcb pointer that was sent from a non qemu thread */
|
414 |
ret = read(s->fds[RBD_FD_READ], p + s->event_reader_pos, |
415 |
sizeof(s->event_rcb) - s->event_reader_pos);
|
416 |
if (ret > 0) { |
417 |
s->event_reader_pos += ret; |
418 |
if (s->event_reader_pos == sizeof(s->event_rcb)) { |
419 |
s->event_reader_pos = 0;
|
420 |
qemu_rbd_complete_aio(s->event_rcb); |
421 |
s->qemu_aio_count--; |
422 |
} |
423 |
} |
424 |
} while (ret < 0 && errno == EINTR); |
425 |
} |
426 |
|
427 |
static int qemu_rbd_aio_flush_cb(void *opaque) |
428 |
{ |
429 |
BDRVRBDState *s = opaque; |
430 |
|
431 |
return (s->qemu_aio_count > 0); |
432 |
} |
433 |
|
434 |
static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags) |
435 |
{ |
436 |
BDRVRBDState *s = bs->opaque; |
437 |
char pool[RBD_MAX_POOL_NAME_SIZE];
|
438 |
char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
|
439 |
char conf[RBD_MAX_CONF_SIZE];
|
440 |
char clientname_buf[RBD_MAX_CONF_SIZE];
|
441 |
char *clientname;
|
442 |
int r;
|
443 |
|
444 |
if (qemu_rbd_parsename(filename, pool, sizeof(pool), |
445 |
snap_buf, sizeof(snap_buf),
|
446 |
s->name, sizeof(s->name),
|
447 |
conf, sizeof(conf)) < 0) { |
448 |
return -EINVAL;
|
449 |
} |
450 |
|
451 |
clientname = qemu_rbd_parse_clientname(conf, clientname_buf); |
452 |
r = rados_create(&s->cluster, clientname); |
453 |
if (r < 0) { |
454 |
error_report("error initializing");
|
455 |
return r;
|
456 |
} |
457 |
|
458 |
s->snap = NULL;
|
459 |
if (snap_buf[0] != '\0') { |
460 |
s->snap = g_strdup(snap_buf); |
461 |
} |
462 |
|
463 |
if (strstr(conf, "conf=") == NULL) { |
464 |
/* try default location, but ignore failure */
|
465 |
rados_conf_read_file(s->cluster, NULL);
|
466 |
} |
467 |
|
468 |
if (conf[0] != '\0') { |
469 |
r = qemu_rbd_set_conf(s->cluster, conf); |
470 |
if (r < 0) { |
471 |
error_report("error setting config options");
|
472 |
goto failed_shutdown;
|
473 |
} |
474 |
} |
475 |
|
476 |
r = rados_connect(s->cluster); |
477 |
if (r < 0) { |
478 |
error_report("error connecting");
|
479 |
goto failed_shutdown;
|
480 |
} |
481 |
|
482 |
r = rados_ioctx_create(s->cluster, pool, &s->io_ctx); |
483 |
if (r < 0) { |
484 |
error_report("error opening pool %s", pool);
|
485 |
goto failed_shutdown;
|
486 |
} |
487 |
|
488 |
r = rbd_open(s->io_ctx, s->name, &s->image, s->snap); |
489 |
if (r < 0) { |
490 |
error_report("error reading header from %s", s->name);
|
491 |
goto failed_open;
|
492 |
} |
493 |
|
494 |
bs->read_only = (s->snap != NULL);
|
495 |
|
496 |
s->event_reader_pos = 0;
|
497 |
r = qemu_pipe(s->fds); |
498 |
if (r < 0) { |
499 |
error_report("error opening eventfd");
|
500 |
goto failed;
|
501 |
} |
502 |
fcntl(s->fds[0], F_SETFL, O_NONBLOCK);
|
503 |
fcntl(s->fds[1], F_SETFL, O_NONBLOCK);
|
504 |
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader, |
505 |
NULL, qemu_rbd_aio_flush_cb, NULL, s); |
506 |
|
507 |
|
508 |
return 0; |
509 |
|
510 |
failed:
|
511 |
rbd_close(s->image); |
512 |
failed_open:
|
513 |
rados_ioctx_destroy(s->io_ctx); |
514 |
failed_shutdown:
|
515 |
rados_shutdown(s->cluster); |
516 |
g_free(s->snap); |
517 |
return r;
|
518 |
} |
519 |
|
520 |
static void qemu_rbd_close(BlockDriverState *bs) |
521 |
{ |
522 |
BDRVRBDState *s = bs->opaque; |
523 |
|
524 |
close(s->fds[0]);
|
525 |
close(s->fds[1]);
|
526 |
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL , NULL, NULL, NULL, |
527 |
NULL);
|
528 |
|
529 |
rbd_close(s->image); |
530 |
rados_ioctx_destroy(s->io_ctx); |
531 |
g_free(s->snap); |
532 |
rados_shutdown(s->cluster); |
533 |
} |
534 |
|
535 |
/*
|
536 |
* Cancel aio. Since we don't reference acb in a non qemu threads,
|
537 |
* it is safe to access it here.
|
538 |
*/
|
539 |
static void qemu_rbd_aio_cancel(BlockDriverAIOCB *blockacb) |
540 |
{ |
541 |
RBDAIOCB *acb = (RBDAIOCB *) blockacb; |
542 |
acb->cancelled = 1;
|
543 |
} |
544 |
|
545 |
static AIOPool rbd_aio_pool = {
|
546 |
.aiocb_size = sizeof(RBDAIOCB),
|
547 |
.cancel = qemu_rbd_aio_cancel, |
548 |
}; |
549 |
|
550 |
static int qemu_rbd_send_pipe(BDRVRBDState *s, RADOSCB *rcb) |
551 |
{ |
552 |
int ret = 0; |
553 |
while (1) { |
554 |
fd_set wfd; |
555 |
int fd = s->fds[RBD_FD_WRITE];
|
556 |
|
557 |
/* send the op pointer to the qemu thread that is responsible
|
558 |
for the aio/op completion. Must do it in a qemu thread context */
|
559 |
ret = write(fd, (void *)&rcb, sizeof(rcb)); |
560 |
if (ret >= 0) { |
561 |
break;
|
562 |
} |
563 |
if (errno == EINTR) {
|
564 |
continue;
|
565 |
} |
566 |
if (errno != EAGAIN) {
|
567 |
break;
|
568 |
} |
569 |
|
570 |
FD_ZERO(&wfd); |
571 |
FD_SET(fd, &wfd); |
572 |
do {
|
573 |
ret = select(fd + 1, NULL, &wfd, NULL, NULL); |
574 |
} while (ret < 0 && errno == EINTR); |
575 |
} |
576 |
|
577 |
return ret;
|
578 |
} |
579 |
|
580 |
/*
|
581 |
* This is the callback function for rbd_aio_read and _write
|
582 |
*
|
583 |
* Note: this function is being called from a non qemu thread so
|
584 |
* we need to be careful about what we do here. Generally we only
|
585 |
* write to the block notification pipe, and do the rest of the
|
586 |
* io completion handling from qemu_rbd_aio_event_reader() which
|
587 |
* runs in a qemu context.
|
588 |
*/
|
589 |
static void rbd_finish_aiocb(rbd_completion_t c, RADOSCB *rcb) |
590 |
{ |
591 |
int ret;
|
592 |
rcb->ret = rbd_aio_get_return_value(c); |
593 |
rbd_aio_release(c); |
594 |
ret = qemu_rbd_send_pipe(rcb->s, rcb); |
595 |
if (ret < 0) { |
596 |
error_report("failed writing to acb->s->fds");
|
597 |
g_free(rcb); |
598 |
} |
599 |
} |
600 |
|
601 |
/* Callback when all queued rbd_aio requests are complete */
|
602 |
|
603 |
static void rbd_aio_bh_cb(void *opaque) |
604 |
{ |
605 |
RBDAIOCB *acb = opaque; |
606 |
|
607 |
if (!acb->write) {
|
608 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
609 |
} |
610 |
qemu_vfree(acb->bounce); |
611 |
acb->common.cb(acb->common.opaque, (acb->ret > 0 ? 0 : acb->ret)); |
612 |
qemu_bh_delete(acb->bh); |
613 |
acb->bh = NULL;
|
614 |
|
615 |
qemu_aio_release(acb); |
616 |
} |
617 |
|
618 |
static BlockDriverAIOCB *rbd_aio_rw_vector(BlockDriverState *bs,
|
619 |
int64_t sector_num, |
620 |
QEMUIOVector *qiov, |
621 |
int nb_sectors,
|
622 |
BlockDriverCompletionFunc *cb, |
623 |
void *opaque, int write) |
624 |
{ |
625 |
RBDAIOCB *acb; |
626 |
RADOSCB *rcb; |
627 |
rbd_completion_t c; |
628 |
int64_t off, size; |
629 |
char *buf;
|
630 |
int r;
|
631 |
|
632 |
BDRVRBDState *s = bs->opaque; |
633 |
|
634 |
acb = qemu_aio_get(&rbd_aio_pool, bs, cb, opaque); |
635 |
if (!acb) {
|
636 |
return NULL; |
637 |
} |
638 |
acb->write = write; |
639 |
acb->qiov = qiov; |
640 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
641 |
acb->ret = 0;
|
642 |
acb->error = 0;
|
643 |
acb->s = s; |
644 |
acb->cancelled = 0;
|
645 |
acb->bh = NULL;
|
646 |
|
647 |
if (write) {
|
648 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
649 |
} |
650 |
|
651 |
buf = acb->bounce; |
652 |
|
653 |
off = sector_num * BDRV_SECTOR_SIZE; |
654 |
size = nb_sectors * BDRV_SECTOR_SIZE; |
655 |
|
656 |
s->qemu_aio_count++; /* All the RADOSCB */
|
657 |
|
658 |
rcb = g_malloc(sizeof(RADOSCB));
|
659 |
rcb->done = 0;
|
660 |
rcb->acb = acb; |
661 |
rcb->buf = buf; |
662 |
rcb->s = acb->s; |
663 |
rcb->size = size; |
664 |
r = rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c); |
665 |
if (r < 0) { |
666 |
goto failed;
|
667 |
} |
668 |
|
669 |
if (write) {
|
670 |
r = rbd_aio_write(s->image, off, size, buf, c); |
671 |
} else {
|
672 |
r = rbd_aio_read(s->image, off, size, buf, c); |
673 |
} |
674 |
|
675 |
if (r < 0) { |
676 |
goto failed;
|
677 |
} |
678 |
|
679 |
return &acb->common;
|
680 |
|
681 |
failed:
|
682 |
g_free(rcb); |
683 |
s->qemu_aio_count--; |
684 |
qemu_aio_release(acb); |
685 |
return NULL; |
686 |
} |
687 |
|
688 |
static BlockDriverAIOCB *qemu_rbd_aio_readv(BlockDriverState *bs,
|
689 |
int64_t sector_num, |
690 |
QEMUIOVector *qiov, |
691 |
int nb_sectors,
|
692 |
BlockDriverCompletionFunc *cb, |
693 |
void *opaque)
|
694 |
{ |
695 |
return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
696 |
} |
697 |
|
698 |
static BlockDriverAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
|
699 |
int64_t sector_num, |
700 |
QEMUIOVector *qiov, |
701 |
int nb_sectors,
|
702 |
BlockDriverCompletionFunc *cb, |
703 |
void *opaque)
|
704 |
{ |
705 |
return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
706 |
} |
707 |
|
708 |
static int qemu_rbd_flush(BlockDriverState *bs) |
709 |
{ |
710 |
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 1) |
711 |
/* rbd_flush added in 0.1.1 */
|
712 |
BDRVRBDState *s = bs->opaque; |
713 |
return rbd_flush(s->image);
|
714 |
#else
|
715 |
return 0; |
716 |
#endif
|
717 |
} |
718 |
|
719 |
static int qemu_rbd_getinfo(BlockDriverState *bs, BlockDriverInfo *bdi) |
720 |
{ |
721 |
BDRVRBDState *s = bs->opaque; |
722 |
rbd_image_info_t info; |
723 |
int r;
|
724 |
|
725 |
r = rbd_stat(s->image, &info, sizeof(info));
|
726 |
if (r < 0) { |
727 |
return r;
|
728 |
} |
729 |
|
730 |
bdi->cluster_size = info.obj_size; |
731 |
return 0; |
732 |
} |
733 |
|
734 |
static int64_t qemu_rbd_getlength(BlockDriverState *bs)
|
735 |
{ |
736 |
BDRVRBDState *s = bs->opaque; |
737 |
rbd_image_info_t info; |
738 |
int r;
|
739 |
|
740 |
r = rbd_stat(s->image, &info, sizeof(info));
|
741 |
if (r < 0) { |
742 |
return r;
|
743 |
} |
744 |
|
745 |
return info.size;
|
746 |
} |
747 |
|
748 |
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset) |
749 |
{ |
750 |
BDRVRBDState *s = bs->opaque; |
751 |
int r;
|
752 |
|
753 |
r = rbd_resize(s->image, offset); |
754 |
if (r < 0) { |
755 |
return r;
|
756 |
} |
757 |
|
758 |
return 0; |
759 |
} |
760 |
|
761 |
static int qemu_rbd_snap_create(BlockDriverState *bs, |
762 |
QEMUSnapshotInfo *sn_info) |
763 |
{ |
764 |
BDRVRBDState *s = bs->opaque; |
765 |
int r;
|
766 |
|
767 |
if (sn_info->name[0] == '\0') { |
768 |
return -EINVAL; /* we need a name for rbd snapshots */ |
769 |
} |
770 |
|
771 |
/*
|
772 |
* rbd snapshots are using the name as the user controlled unique identifier
|
773 |
* we can't use the rbd snapid for that purpose, as it can't be set
|
774 |
*/
|
775 |
if (sn_info->id_str[0] != '\0' && |
776 |
strcmp(sn_info->id_str, sn_info->name) != 0) {
|
777 |
return -EINVAL;
|
778 |
} |
779 |
|
780 |
if (strlen(sn_info->name) >= sizeof(sn_info->id_str)) { |
781 |
return -ERANGE;
|
782 |
} |
783 |
|
784 |
r = rbd_snap_create(s->image, sn_info->name); |
785 |
if (r < 0) { |
786 |
error_report("failed to create snap: %s", strerror(-r));
|
787 |
return r;
|
788 |
} |
789 |
|
790 |
return 0; |
791 |
} |
792 |
|
793 |
static int qemu_rbd_snap_list(BlockDriverState *bs, |
794 |
QEMUSnapshotInfo **psn_tab) |
795 |
{ |
796 |
BDRVRBDState *s = bs->opaque; |
797 |
QEMUSnapshotInfo *sn_info, *sn_tab = NULL;
|
798 |
int i, snap_count;
|
799 |
rbd_snap_info_t *snaps; |
800 |
int max_snaps = RBD_MAX_SNAPS;
|
801 |
|
802 |
do {
|
803 |
snaps = g_malloc(sizeof(*snaps) * max_snaps);
|
804 |
snap_count = rbd_snap_list(s->image, snaps, &max_snaps); |
805 |
if (snap_count < 0) { |
806 |
g_free(snaps); |
807 |
} |
808 |
} while (snap_count == -ERANGE);
|
809 |
|
810 |
if (snap_count <= 0) { |
811 |
return snap_count;
|
812 |
} |
813 |
|
814 |
sn_tab = g_malloc0(snap_count * sizeof(QEMUSnapshotInfo));
|
815 |
|
816 |
for (i = 0; i < snap_count; i++) { |
817 |
const char *snap_name = snaps[i].name; |
818 |
|
819 |
sn_info = sn_tab + i; |
820 |
pstrcpy(sn_info->id_str, sizeof(sn_info->id_str), snap_name);
|
821 |
pstrcpy(sn_info->name, sizeof(sn_info->name), snap_name);
|
822 |
|
823 |
sn_info->vm_state_size = snaps[i].size; |
824 |
sn_info->date_sec = 0;
|
825 |
sn_info->date_nsec = 0;
|
826 |
sn_info->vm_clock_nsec = 0;
|
827 |
} |
828 |
rbd_snap_list_end(snaps); |
829 |
|
830 |
*psn_tab = sn_tab; |
831 |
return snap_count;
|
832 |
} |
833 |
|
834 |
static QEMUOptionParameter qemu_rbd_create_options[] = {
|
835 |
{ |
836 |
.name = BLOCK_OPT_SIZE, |
837 |
.type = OPT_SIZE, |
838 |
.help = "Virtual disk size"
|
839 |
}, |
840 |
{ |
841 |
.name = BLOCK_OPT_CLUSTER_SIZE, |
842 |
.type = OPT_SIZE, |
843 |
.help = "RBD object size"
|
844 |
}, |
845 |
{NULL}
|
846 |
}; |
847 |
|
848 |
static BlockDriver bdrv_rbd = {
|
849 |
.format_name = "rbd",
|
850 |
.instance_size = sizeof(BDRVRBDState),
|
851 |
.bdrv_file_open = qemu_rbd_open, |
852 |
.bdrv_close = qemu_rbd_close, |
853 |
.bdrv_create = qemu_rbd_create, |
854 |
.bdrv_flush = qemu_rbd_flush, |
855 |
.bdrv_get_info = qemu_rbd_getinfo, |
856 |
.create_options = qemu_rbd_create_options, |
857 |
.bdrv_getlength = qemu_rbd_getlength, |
858 |
.bdrv_truncate = qemu_rbd_truncate, |
859 |
.protocol_name = "rbd",
|
860 |
|
861 |
.bdrv_aio_readv = qemu_rbd_aio_readv, |
862 |
.bdrv_aio_writev = qemu_rbd_aio_writev, |
863 |
|
864 |
.bdrv_snapshot_create = qemu_rbd_snap_create, |
865 |
.bdrv_snapshot_list = qemu_rbd_snap_list, |
866 |
}; |
867 |
|
868 |
static void bdrv_rbd_init(void) |
869 |
{ |
870 |
bdrv_register(&bdrv_rbd); |
871 |
} |
872 |
|
873 |
block_init(bdrv_rbd_init); |