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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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include <inttypes.h> |
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#include "qemu-common.h" |
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#include "qemu-error.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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|
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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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|
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#define OBJ_MAX_SIZE (1UL << OBJ_DEFAULT_OBJ_ORDER) |
55 |
|
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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 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; |
68 |
|
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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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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; |
81 |
|
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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; |
91 |
|
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#define RBD_FD_READ 0 |
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#define RBD_FD_WRITE 1 |
94 |
|
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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; |
106 |
|
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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') { |
120 |
for (end = src; *end; ++end) {
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if (*end == delim) {
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break;
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} |
124 |
if (*end == '\\' && end[1] != '\0') { |
125 |
end++; |
126 |
} |
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} |
128 |
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); |
134 |
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) { |
138 |
error_report("%s too short", name);
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return -EINVAL;
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} |
141 |
|
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pstrcpy(dst, dst_len, src); |
143 |
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return 0; |
145 |
} |
146 |
|
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static void qemu_rbd_unescape(char *src) |
148 |
{ |
149 |
char *p;
|
150 |
|
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for (p = src; *src; ++src, ++p) {
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if (*src == '\\' && src[1] != '\0') { |
153 |
src++; |
154 |
} |
155 |
*p = *src; |
156 |
} |
157 |
*p = '\0';
|
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} |
159 |
|
160 |
static int qemu_rbd_parsename(const char *filename, |
161 |
char *pool, int pool_len, |
162 |
char *snap, int snap_len, |
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char *name, int name_len, |
164 |
char *conf, int conf_len) |
165 |
{ |
166 |
const char *start; |
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char *p, *buf;
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int ret;
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169 |
|
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if (!strstart(filename, "rbd:", &start)) { |
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return -EINVAL;
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} |
173 |
|
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buf = g_strdup(start); |
175 |
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); |
180 |
if (ret < 0 || !p) { |
181 |
ret = -EINVAL; |
182 |
goto done;
|
183 |
} |
184 |
qemu_rbd_unescape(pool); |
185 |
|
186 |
if (strchr(p, '@')) { |
187 |
ret = qemu_rbd_next_tok(name, name_len, p, '@', "object name", &p); |
188 |
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); |
192 |
qemu_rbd_unescape(snap); |
193 |
} else {
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ret = qemu_rbd_next_tok(name, name_len, p, ':', "object name", &p); |
195 |
} |
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qemu_rbd_unescape(name); |
197 |
if (ret < 0 || !p) { |
198 |
goto done;
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199 |
} |
200 |
|
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ret = qemu_rbd_next_tok(conf, conf_len, p, '\0', "configuration", &p); |
202 |
|
203 |
done:
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g_free(buf); |
205 |
return ret;
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} |
207 |
|
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static char *qemu_rbd_parse_clientname(const char *conf, char *clientname) |
209 |
{ |
210 |
const char *p = conf; |
211 |
|
212 |
while (*p) {
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int len;
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const char *end = strchr(p, ':'); |
215 |
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216 |
if (end) {
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len = end - p; |
218 |
} else {
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len = strlen(p); |
220 |
} |
221 |
|
222 |
if (strncmp(p, "id=", 3) == 0) { |
223 |
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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} |
228 |
if (end == NULL) { |
229 |
break;
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230 |
} |
231 |
p = end + 1;
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232 |
} |
233 |
return NULL; |
234 |
} |
235 |
|
236 |
static int qemu_rbd_set_conf(rados_t cluster, const char *conf) |
237 |
{ |
238 |
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; |
242 |
|
243 |
buf = g_strdup(conf); |
244 |
p = buf; |
245 |
|
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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); |
249 |
if (ret < 0) { |
250 |
break;
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} |
252 |
qemu_rbd_unescape(name); |
253 |
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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; |
257 |
break;
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} |
259 |
|
260 |
ret = qemu_rbd_next_tok(value, sizeof(value), p,
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':', "conf option value", &p); |
262 |
if (ret < 0) { |
263 |
break;
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264 |
} |
265 |
qemu_rbd_unescape(value); |
266 |
|
267 |
if (strcmp(name, "conf") == 0) { |
268 |
ret = rados_conf_read_file(cluster, value); |
269 |
if (ret < 0) { |
270 |
error_report("error reading conf file %s", value);
|
271 |
break;
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272 |
} |
273 |
} else if (strcmp(name, "id") == 0) { |
274 |
/* ignore, this is parsed by qemu_rbd_parse_clientname() */
|
275 |
} else {
|
276 |
ret = rados_conf_set(cluster, name, value); |
277 |
if (ret < 0) { |
278 |
error_report("invalid conf option %s", name);
|
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ret = -EINVAL; |
280 |
break;
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281 |
} |
282 |
} |
283 |
} |
284 |
|
285 |
g_free(buf); |
286 |
return ret;
|
287 |
} |
288 |
|
289 |
static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options) |
290 |
{ |
291 |
int64_t bytes = 0;
|
292 |
int64_t objsize; |
293 |
int obj_order = 0; |
294 |
char pool[RBD_MAX_POOL_NAME_SIZE];
|
295 |
char name[RBD_MAX_IMAGE_NAME_SIZE];
|
296 |
char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
|
297 |
char conf[RBD_MAX_CONF_SIZE];
|
298 |
char clientname_buf[RBD_MAX_CONF_SIZE];
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299 |
char *clientname;
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300 |
rados_t cluster; |
301 |
rados_ioctx_t io_ctx; |
302 |
int ret;
|
303 |
|
304 |
if (qemu_rbd_parsename(filename, pool, sizeof(pool), |
305 |
snap_buf, sizeof(snap_buf),
|
306 |
name, sizeof(name),
|
307 |
conf, sizeof(conf)) < 0) { |
308 |
return -EINVAL;
|
309 |
} |
310 |
|
311 |
/* Read out options */
|
312 |
while (options && options->name) {
|
313 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
314 |
bytes = options->value.n; |
315 |
} else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
316 |
if (options->value.n) {
|
317 |
objsize = options->value.n; |
318 |
if ((objsize - 1) & objsize) { /* not a power of 2? */ |
319 |
error_report("obj size needs to be power of 2");
|
320 |
return -EINVAL;
|
321 |
} |
322 |
if (objsize < 4096) { |
323 |
error_report("obj size too small");
|
324 |
return -EINVAL;
|
325 |
} |
326 |
obj_order = ffs(objsize) - 1;
|
327 |
} |
328 |
} |
329 |
options++; |
330 |
} |
331 |
|
332 |
clientname = qemu_rbd_parse_clientname(conf, clientname_buf); |
333 |
if (rados_create(&cluster, clientname) < 0) { |
334 |
error_report("error initializing");
|
335 |
return -EIO;
|
336 |
} |
337 |
|
338 |
if (strstr(conf, "conf=") == NULL) { |
339 |
/* try default location, but ignore failure */
|
340 |
rados_conf_read_file(cluster, NULL);
|
341 |
} |
342 |
|
343 |
if (conf[0] != '\0' && |
344 |
qemu_rbd_set_conf(cluster, conf) < 0) {
|
345 |
error_report("error setting config options");
|
346 |
rados_shutdown(cluster); |
347 |
return -EIO;
|
348 |
} |
349 |
|
350 |
if (rados_connect(cluster) < 0) { |
351 |
error_report("error connecting");
|
352 |
rados_shutdown(cluster); |
353 |
return -EIO;
|
354 |
} |
355 |
|
356 |
if (rados_ioctx_create(cluster, pool, &io_ctx) < 0) { |
357 |
error_report("error opening pool %s", pool);
|
358 |
rados_shutdown(cluster); |
359 |
return -EIO;
|
360 |
} |
361 |
|
362 |
ret = rbd_create(io_ctx, name, bytes, &obj_order); |
363 |
rados_ioctx_destroy(io_ctx); |
364 |
rados_shutdown(cluster); |
365 |
|
366 |
return ret;
|
367 |
} |
368 |
|
369 |
/*
|
370 |
* This aio completion is being called from qemu_rbd_aio_event_reader()
|
371 |
* and runs in qemu context. It schedules a bh, but just in case the aio
|
372 |
* was not cancelled before.
|
373 |
*/
|
374 |
static void qemu_rbd_complete_aio(RADOSCB *rcb) |
375 |
{ |
376 |
RBDAIOCB *acb = rcb->acb; |
377 |
int64_t r; |
378 |
|
379 |
if (acb->cancelled) {
|
380 |
qemu_vfree(acb->bounce); |
381 |
qemu_aio_release(acb); |
382 |
goto done;
|
383 |
} |
384 |
|
385 |
r = rcb->ret; |
386 |
|
387 |
if (acb->cmd == RBD_AIO_WRITE ||
|
388 |
acb->cmd == RBD_AIO_DISCARD) { |
389 |
if (r < 0) { |
390 |
acb->ret = r; |
391 |
acb->error = 1;
|
392 |
} else if (!acb->error) { |
393 |
acb->ret = rcb->size; |
394 |
} |
395 |
} else {
|
396 |
if (r < 0) { |
397 |
memset(rcb->buf, 0, rcb->size);
|
398 |
acb->ret = r; |
399 |
acb->error = 1;
|
400 |
} else if (r < rcb->size) { |
401 |
memset(rcb->buf + r, 0, rcb->size - r);
|
402 |
if (!acb->error) {
|
403 |
acb->ret = rcb->size; |
404 |
} |
405 |
} else if (!acb->error) { |
406 |
acb->ret = r; |
407 |
} |
408 |
} |
409 |
/* Note that acb->bh can be NULL in case where the aio was cancelled */
|
410 |
acb->bh = qemu_bh_new(rbd_aio_bh_cb, acb); |
411 |
qemu_bh_schedule(acb->bh); |
412 |
done:
|
413 |
g_free(rcb); |
414 |
} |
415 |
|
416 |
/*
|
417 |
* aio fd read handler. It runs in the qemu context and calls the
|
418 |
* completion handling of completed rados aio operations.
|
419 |
*/
|
420 |
static void qemu_rbd_aio_event_reader(void *opaque) |
421 |
{ |
422 |
BDRVRBDState *s = opaque; |
423 |
|
424 |
ssize_t ret; |
425 |
|
426 |
do {
|
427 |
char *p = (char *)&s->event_rcb; |
428 |
|
429 |
/* now read the rcb pointer that was sent from a non qemu thread */
|
430 |
ret = read(s->fds[RBD_FD_READ], p + s->event_reader_pos, |
431 |
sizeof(s->event_rcb) - s->event_reader_pos);
|
432 |
if (ret > 0) { |
433 |
s->event_reader_pos += ret; |
434 |
if (s->event_reader_pos == sizeof(s->event_rcb)) { |
435 |
s->event_reader_pos = 0;
|
436 |
qemu_rbd_complete_aio(s->event_rcb); |
437 |
s->qemu_aio_count--; |
438 |
} |
439 |
} |
440 |
} while (ret < 0 && errno == EINTR); |
441 |
} |
442 |
|
443 |
static int qemu_rbd_aio_flush_cb(void *opaque) |
444 |
{ |
445 |
BDRVRBDState *s = opaque; |
446 |
|
447 |
return (s->qemu_aio_count > 0); |
448 |
} |
449 |
|
450 |
static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags) |
451 |
{ |
452 |
BDRVRBDState *s = bs->opaque; |
453 |
char pool[RBD_MAX_POOL_NAME_SIZE];
|
454 |
char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
|
455 |
char conf[RBD_MAX_CONF_SIZE];
|
456 |
char clientname_buf[RBD_MAX_CONF_SIZE];
|
457 |
char *clientname;
|
458 |
int r;
|
459 |
|
460 |
if (qemu_rbd_parsename(filename, pool, sizeof(pool), |
461 |
snap_buf, sizeof(snap_buf),
|
462 |
s->name, sizeof(s->name),
|
463 |
conf, sizeof(conf)) < 0) { |
464 |
return -EINVAL;
|
465 |
} |
466 |
|
467 |
clientname = qemu_rbd_parse_clientname(conf, clientname_buf); |
468 |
r = rados_create(&s->cluster, clientname); |
469 |
if (r < 0) { |
470 |
error_report("error initializing");
|
471 |
return r;
|
472 |
} |
473 |
|
474 |
s->snap = NULL;
|
475 |
if (snap_buf[0] != '\0') { |
476 |
s->snap = g_strdup(snap_buf); |
477 |
} |
478 |
|
479 |
/*
|
480 |
* Fallback to more conservative semantics if setting cache
|
481 |
* options fails. Ignore errors from setting rbd_cache because the
|
482 |
* only possible error is that the option does not exist, and
|
483 |
* librbd defaults to no caching. If write through caching cannot
|
484 |
* be set up, fall back to no caching.
|
485 |
*/
|
486 |
if (flags & BDRV_O_NOCACHE) {
|
487 |
rados_conf_set(s->cluster, "rbd_cache", "false"); |
488 |
} else {
|
489 |
rados_conf_set(s->cluster, "rbd_cache", "true"); |
490 |
if (!(flags & BDRV_O_CACHE_WB)) {
|
491 |
r = rados_conf_set(s->cluster, "rbd_cache_max_dirty", "0"); |
492 |
if (r < 0) { |
493 |
rados_conf_set(s->cluster, "rbd_cache", "false"); |
494 |
} |
495 |
} |
496 |
} |
497 |
|
498 |
if (strstr(conf, "conf=") == NULL) { |
499 |
/* try default location, but ignore failure */
|
500 |
rados_conf_read_file(s->cluster, NULL);
|
501 |
} |
502 |
|
503 |
if (conf[0] != '\0') { |
504 |
r = qemu_rbd_set_conf(s->cluster, conf); |
505 |
if (r < 0) { |
506 |
error_report("error setting config options");
|
507 |
goto failed_shutdown;
|
508 |
} |
509 |
} |
510 |
|
511 |
r = rados_connect(s->cluster); |
512 |
if (r < 0) { |
513 |
error_report("error connecting");
|
514 |
goto failed_shutdown;
|
515 |
} |
516 |
|
517 |
r = rados_ioctx_create(s->cluster, pool, &s->io_ctx); |
518 |
if (r < 0) { |
519 |
error_report("error opening pool %s", pool);
|
520 |
goto failed_shutdown;
|
521 |
} |
522 |
|
523 |
r = rbd_open(s->io_ctx, s->name, &s->image, s->snap); |
524 |
if (r < 0) { |
525 |
error_report("error reading header from %s", s->name);
|
526 |
goto failed_open;
|
527 |
} |
528 |
|
529 |
bs->read_only = (s->snap != NULL);
|
530 |
|
531 |
s->event_reader_pos = 0;
|
532 |
r = qemu_pipe(s->fds); |
533 |
if (r < 0) { |
534 |
error_report("error opening eventfd");
|
535 |
goto failed;
|
536 |
} |
537 |
fcntl(s->fds[0], F_SETFL, O_NONBLOCK);
|
538 |
fcntl(s->fds[1], F_SETFL, O_NONBLOCK);
|
539 |
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader, |
540 |
NULL, qemu_rbd_aio_flush_cb, s);
|
541 |
|
542 |
|
543 |
return 0; |
544 |
|
545 |
failed:
|
546 |
rbd_close(s->image); |
547 |
failed_open:
|
548 |
rados_ioctx_destroy(s->io_ctx); |
549 |
failed_shutdown:
|
550 |
rados_shutdown(s->cluster); |
551 |
g_free(s->snap); |
552 |
return r;
|
553 |
} |
554 |
|
555 |
static void qemu_rbd_close(BlockDriverState *bs) |
556 |
{ |
557 |
BDRVRBDState *s = bs->opaque; |
558 |
|
559 |
close(s->fds[0]);
|
560 |
close(s->fds[1]);
|
561 |
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL, NULL); |
562 |
|
563 |
rbd_close(s->image); |
564 |
rados_ioctx_destroy(s->io_ctx); |
565 |
g_free(s->snap); |
566 |
rados_shutdown(s->cluster); |
567 |
} |
568 |
|
569 |
/*
|
570 |
* Cancel aio. Since we don't reference acb in a non qemu threads,
|
571 |
* it is safe to access it here.
|
572 |
*/
|
573 |
static void qemu_rbd_aio_cancel(BlockDriverAIOCB *blockacb) |
574 |
{ |
575 |
RBDAIOCB *acb = (RBDAIOCB *) blockacb; |
576 |
acb->cancelled = 1;
|
577 |
} |
578 |
|
579 |
static AIOPool rbd_aio_pool = {
|
580 |
.aiocb_size = sizeof(RBDAIOCB),
|
581 |
.cancel = qemu_rbd_aio_cancel, |
582 |
}; |
583 |
|
584 |
static int qemu_rbd_send_pipe(BDRVRBDState *s, RADOSCB *rcb) |
585 |
{ |
586 |
int ret = 0; |
587 |
while (1) { |
588 |
fd_set wfd; |
589 |
int fd = s->fds[RBD_FD_WRITE];
|
590 |
|
591 |
/* send the op pointer to the qemu thread that is responsible
|
592 |
for the aio/op completion. Must do it in a qemu thread context */
|
593 |
ret = write(fd, (void *)&rcb, sizeof(rcb)); |
594 |
if (ret >= 0) { |
595 |
break;
|
596 |
} |
597 |
if (errno == EINTR) {
|
598 |
continue;
|
599 |
} |
600 |
if (errno != EAGAIN) {
|
601 |
break;
|
602 |
} |
603 |
|
604 |
FD_ZERO(&wfd); |
605 |
FD_SET(fd, &wfd); |
606 |
do {
|
607 |
ret = select(fd + 1, NULL, &wfd, NULL, NULL); |
608 |
} while (ret < 0 && errno == EINTR); |
609 |
} |
610 |
|
611 |
return ret;
|
612 |
} |
613 |
|
614 |
/*
|
615 |
* This is the callback function for rbd_aio_read and _write
|
616 |
*
|
617 |
* Note: this function is being called from a non qemu thread so
|
618 |
* we need to be careful about what we do here. Generally we only
|
619 |
* write to the block notification pipe, and do the rest of the
|
620 |
* io completion handling from qemu_rbd_aio_event_reader() which
|
621 |
* runs in a qemu context.
|
622 |
*/
|
623 |
static void rbd_finish_aiocb(rbd_completion_t c, RADOSCB *rcb) |
624 |
{ |
625 |
int ret;
|
626 |
rcb->ret = rbd_aio_get_return_value(c); |
627 |
rbd_aio_release(c); |
628 |
ret = qemu_rbd_send_pipe(rcb->s, rcb); |
629 |
if (ret < 0) { |
630 |
error_report("failed writing to acb->s->fds");
|
631 |
g_free(rcb); |
632 |
} |
633 |
} |
634 |
|
635 |
/* Callback when all queued rbd_aio requests are complete */
|
636 |
|
637 |
static void rbd_aio_bh_cb(void *opaque) |
638 |
{ |
639 |
RBDAIOCB *acb = opaque; |
640 |
|
641 |
if (acb->cmd == RBD_AIO_READ) {
|
642 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
643 |
} |
644 |
qemu_vfree(acb->bounce); |
645 |
acb->common.cb(acb->common.opaque, (acb->ret > 0 ? 0 : acb->ret)); |
646 |
qemu_bh_delete(acb->bh); |
647 |
acb->bh = NULL;
|
648 |
|
649 |
qemu_aio_release(acb); |
650 |
} |
651 |
|
652 |
static int rbd_aio_discard_wrapper(rbd_image_t image, |
653 |
uint64_t off, |
654 |
uint64_t len, |
655 |
rbd_completion_t comp) |
656 |
{ |
657 |
#ifdef LIBRBD_SUPPORTS_DISCARD
|
658 |
return rbd_aio_discard(image, off, len, comp);
|
659 |
#else
|
660 |
return -ENOTSUP;
|
661 |
#endif
|
662 |
} |
663 |
|
664 |
static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
|
665 |
int64_t sector_num, |
666 |
QEMUIOVector *qiov, |
667 |
int nb_sectors,
|
668 |
BlockDriverCompletionFunc *cb, |
669 |
void *opaque,
|
670 |
RBDAIOCmd cmd) |
671 |
{ |
672 |
RBDAIOCB *acb; |
673 |
RADOSCB *rcb; |
674 |
rbd_completion_t c; |
675 |
int64_t off, size; |
676 |
char *buf;
|
677 |
int r;
|
678 |
|
679 |
BDRVRBDState *s = bs->opaque; |
680 |
|
681 |
acb = qemu_aio_get(&rbd_aio_pool, bs, cb, opaque); |
682 |
acb->cmd = cmd; |
683 |
acb->qiov = qiov; |
684 |
if (cmd == RBD_AIO_DISCARD) {
|
685 |
acb->bounce = NULL;
|
686 |
} else {
|
687 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
688 |
} |
689 |
acb->ret = 0;
|
690 |
acb->error = 0;
|
691 |
acb->s = s; |
692 |
acb->cancelled = 0;
|
693 |
acb->bh = NULL;
|
694 |
|
695 |
if (cmd == RBD_AIO_WRITE) {
|
696 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
697 |
} |
698 |
|
699 |
buf = acb->bounce; |
700 |
|
701 |
off = sector_num * BDRV_SECTOR_SIZE; |
702 |
size = nb_sectors * BDRV_SECTOR_SIZE; |
703 |
|
704 |
s->qemu_aio_count++; /* All the RADOSCB */
|
705 |
|
706 |
rcb = g_malloc(sizeof(RADOSCB));
|
707 |
rcb->done = 0;
|
708 |
rcb->acb = acb; |
709 |
rcb->buf = buf; |
710 |
rcb->s = acb->s; |
711 |
rcb->size = size; |
712 |
r = rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c); |
713 |
if (r < 0) { |
714 |
goto failed;
|
715 |
} |
716 |
|
717 |
switch (cmd) {
|
718 |
case RBD_AIO_WRITE:
|
719 |
r = rbd_aio_write(s->image, off, size, buf, c); |
720 |
break;
|
721 |
case RBD_AIO_READ:
|
722 |
r = rbd_aio_read(s->image, off, size, buf, c); |
723 |
break;
|
724 |
case RBD_AIO_DISCARD:
|
725 |
r = rbd_aio_discard_wrapper(s->image, off, size, c); |
726 |
break;
|
727 |
default:
|
728 |
r = -EINVAL; |
729 |
} |
730 |
|
731 |
if (r < 0) { |
732 |
goto failed;
|
733 |
} |
734 |
|
735 |
return &acb->common;
|
736 |
|
737 |
failed:
|
738 |
g_free(rcb); |
739 |
s->qemu_aio_count--; |
740 |
qemu_aio_release(acb); |
741 |
return NULL; |
742 |
} |
743 |
|
744 |
static BlockDriverAIOCB *qemu_rbd_aio_readv(BlockDriverState *bs,
|
745 |
int64_t sector_num, |
746 |
QEMUIOVector *qiov, |
747 |
int nb_sectors,
|
748 |
BlockDriverCompletionFunc *cb, |
749 |
void *opaque)
|
750 |
{ |
751 |
return rbd_start_aio(bs, sector_num, qiov, nb_sectors, cb, opaque,
|
752 |
RBD_AIO_READ); |
753 |
} |
754 |
|
755 |
static BlockDriverAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
|
756 |
int64_t sector_num, |
757 |
QEMUIOVector *qiov, |
758 |
int nb_sectors,
|
759 |
BlockDriverCompletionFunc *cb, |
760 |
void *opaque)
|
761 |
{ |
762 |
return rbd_start_aio(bs, sector_num, qiov, nb_sectors, cb, opaque,
|
763 |
RBD_AIO_WRITE); |
764 |
} |
765 |
|
766 |
static int qemu_rbd_co_flush(BlockDriverState *bs) |
767 |
{ |
768 |
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 1) |
769 |
/* rbd_flush added in 0.1.1 */
|
770 |
BDRVRBDState *s = bs->opaque; |
771 |
return rbd_flush(s->image);
|
772 |
#else
|
773 |
return 0; |
774 |
#endif
|
775 |
} |
776 |
|
777 |
static int qemu_rbd_getinfo(BlockDriverState *bs, BlockDriverInfo *bdi) |
778 |
{ |
779 |
BDRVRBDState *s = bs->opaque; |
780 |
rbd_image_info_t info; |
781 |
int r;
|
782 |
|
783 |
r = rbd_stat(s->image, &info, sizeof(info));
|
784 |
if (r < 0) { |
785 |
return r;
|
786 |
} |
787 |
|
788 |
bdi->cluster_size = info.obj_size; |
789 |
return 0; |
790 |
} |
791 |
|
792 |
static int64_t qemu_rbd_getlength(BlockDriverState *bs)
|
793 |
{ |
794 |
BDRVRBDState *s = bs->opaque; |
795 |
rbd_image_info_t info; |
796 |
int r;
|
797 |
|
798 |
r = rbd_stat(s->image, &info, sizeof(info));
|
799 |
if (r < 0) { |
800 |
return r;
|
801 |
} |
802 |
|
803 |
return info.size;
|
804 |
} |
805 |
|
806 |
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset) |
807 |
{ |
808 |
BDRVRBDState *s = bs->opaque; |
809 |
int r;
|
810 |
|
811 |
r = rbd_resize(s->image, offset); |
812 |
if (r < 0) { |
813 |
return r;
|
814 |
} |
815 |
|
816 |
return 0; |
817 |
} |
818 |
|
819 |
static int qemu_rbd_snap_create(BlockDriverState *bs, |
820 |
QEMUSnapshotInfo *sn_info) |
821 |
{ |
822 |
BDRVRBDState *s = bs->opaque; |
823 |
int r;
|
824 |
|
825 |
if (sn_info->name[0] == '\0') { |
826 |
return -EINVAL; /* we need a name for rbd snapshots */ |
827 |
} |
828 |
|
829 |
/*
|
830 |
* rbd snapshots are using the name as the user controlled unique identifier
|
831 |
* we can't use the rbd snapid for that purpose, as it can't be set
|
832 |
*/
|
833 |
if (sn_info->id_str[0] != '\0' && |
834 |
strcmp(sn_info->id_str, sn_info->name) != 0) {
|
835 |
return -EINVAL;
|
836 |
} |
837 |
|
838 |
if (strlen(sn_info->name) >= sizeof(sn_info->id_str)) { |
839 |
return -ERANGE;
|
840 |
} |
841 |
|
842 |
r = rbd_snap_create(s->image, sn_info->name); |
843 |
if (r < 0) { |
844 |
error_report("failed to create snap: %s", strerror(-r));
|
845 |
return r;
|
846 |
} |
847 |
|
848 |
return 0; |
849 |
} |
850 |
|
851 |
static int qemu_rbd_snap_remove(BlockDriverState *bs, |
852 |
const char *snapshot_name) |
853 |
{ |
854 |
BDRVRBDState *s = bs->opaque; |
855 |
int r;
|
856 |
|
857 |
r = rbd_snap_remove(s->image, snapshot_name); |
858 |
return r;
|
859 |
} |
860 |
|
861 |
static int qemu_rbd_snap_rollback(BlockDriverState *bs, |
862 |
const char *snapshot_name) |
863 |
{ |
864 |
BDRVRBDState *s = bs->opaque; |
865 |
int r;
|
866 |
|
867 |
r = rbd_snap_rollback(s->image, snapshot_name); |
868 |
return r;
|
869 |
} |
870 |
|
871 |
static int qemu_rbd_snap_list(BlockDriverState *bs, |
872 |
QEMUSnapshotInfo **psn_tab) |
873 |
{ |
874 |
BDRVRBDState *s = bs->opaque; |
875 |
QEMUSnapshotInfo *sn_info, *sn_tab = NULL;
|
876 |
int i, snap_count;
|
877 |
rbd_snap_info_t *snaps; |
878 |
int max_snaps = RBD_MAX_SNAPS;
|
879 |
|
880 |
do {
|
881 |
snaps = g_malloc(sizeof(*snaps) * max_snaps);
|
882 |
snap_count = rbd_snap_list(s->image, snaps, &max_snaps); |
883 |
if (snap_count < 0) { |
884 |
g_free(snaps); |
885 |
} |
886 |
} while (snap_count == -ERANGE);
|
887 |
|
888 |
if (snap_count <= 0) { |
889 |
goto done;
|
890 |
} |
891 |
|
892 |
sn_tab = g_malloc0(snap_count * sizeof(QEMUSnapshotInfo));
|
893 |
|
894 |
for (i = 0; i < snap_count; i++) { |
895 |
const char *snap_name = snaps[i].name; |
896 |
|
897 |
sn_info = sn_tab + i; |
898 |
pstrcpy(sn_info->id_str, sizeof(sn_info->id_str), snap_name);
|
899 |
pstrcpy(sn_info->name, sizeof(sn_info->name), snap_name);
|
900 |
|
901 |
sn_info->vm_state_size = snaps[i].size; |
902 |
sn_info->date_sec = 0;
|
903 |
sn_info->date_nsec = 0;
|
904 |
sn_info->vm_clock_nsec = 0;
|
905 |
} |
906 |
rbd_snap_list_end(snaps); |
907 |
|
908 |
done:
|
909 |
*psn_tab = sn_tab; |
910 |
return snap_count;
|
911 |
} |
912 |
|
913 |
#ifdef LIBRBD_SUPPORTS_DISCARD
|
914 |
static BlockDriverAIOCB* qemu_rbd_aio_discard(BlockDriverState *bs,
|
915 |
int64_t sector_num, |
916 |
int nb_sectors,
|
917 |
BlockDriverCompletionFunc *cb, |
918 |
void *opaque)
|
919 |
{ |
920 |
return rbd_start_aio(bs, sector_num, NULL, nb_sectors, cb, opaque, |
921 |
RBD_AIO_DISCARD); |
922 |
} |
923 |
#endif
|
924 |
|
925 |
static QEMUOptionParameter qemu_rbd_create_options[] = {
|
926 |
{ |
927 |
.name = BLOCK_OPT_SIZE, |
928 |
.type = OPT_SIZE, |
929 |
.help = "Virtual disk size"
|
930 |
}, |
931 |
{ |
932 |
.name = BLOCK_OPT_CLUSTER_SIZE, |
933 |
.type = OPT_SIZE, |
934 |
.help = "RBD object size"
|
935 |
}, |
936 |
{NULL}
|
937 |
}; |
938 |
|
939 |
static BlockDriver bdrv_rbd = {
|
940 |
.format_name = "rbd",
|
941 |
.instance_size = sizeof(BDRVRBDState),
|
942 |
.bdrv_file_open = qemu_rbd_open, |
943 |
.bdrv_close = qemu_rbd_close, |
944 |
.bdrv_create = qemu_rbd_create, |
945 |
.bdrv_get_info = qemu_rbd_getinfo, |
946 |
.create_options = qemu_rbd_create_options, |
947 |
.bdrv_getlength = qemu_rbd_getlength, |
948 |
.bdrv_truncate = qemu_rbd_truncate, |
949 |
.protocol_name = "rbd",
|
950 |
|
951 |
.bdrv_aio_readv = qemu_rbd_aio_readv, |
952 |
.bdrv_aio_writev = qemu_rbd_aio_writev, |
953 |
.bdrv_co_flush_to_disk = qemu_rbd_co_flush, |
954 |
|
955 |
#ifdef LIBRBD_SUPPORTS_DISCARD
|
956 |
.bdrv_aio_discard = qemu_rbd_aio_discard, |
957 |
#endif
|
958 |
|
959 |
.bdrv_snapshot_create = qemu_rbd_snap_create, |
960 |
.bdrv_snapshot_delete = qemu_rbd_snap_remove, |
961 |
.bdrv_snapshot_list = qemu_rbd_snap_list, |
962 |
.bdrv_snapshot_goto = qemu_rbd_snap_rollback, |
963 |
}; |
964 |
|
965 |
static void bdrv_rbd_init(void) |
966 |
{ |
967 |
bdrv_register(&bdrv_rbd); |
968 |
} |
969 |
|
970 |
block_init(bdrv_rbd_init); |