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sheepdog: Implement bdrv_parse_filename()

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This permits configuration with driver-specific options in addition to
pseudo-filename parsed as URI.  For instance,

    --drive driver=sheepdog,host=fido,vdi=dolly

instead of

    --drive driver=sheepdog,file=sheepdog://fido/dolly

It's also a first step towards supporting blockdev-add.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2017-03-06 20:00:43 +01:00 committed by Kevin Wolf
parent 8ecc2f9eab
commit 831acdc95e
1 changed files with 176 additions and 58 deletions
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234
block/sheepdog.c
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@ -14,6 +14,8 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qint.h"
#include "qemu/uri.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
@ -526,6 +528,25 @@ static void sd_aio_setup(SheepdogAIOCB *acb, BDRVSheepdogState *s,
QLIST_INSERT_HEAD(&s->inflight_aiocb_head, acb, aiocb_siblings);
}
static SocketAddress *sd_socket_address(const char *path,
const char *host, const char *port)
{
SocketAddress *addr = g_new0(SocketAddress, 1);
if (path) {
addr->type = SOCKET_ADDRESS_KIND_UNIX;
addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
addr->u.q_unix.data->path = g_strdup(path);
} else {
addr->type = SOCKET_ADDRESS_KIND_INET;
addr->u.inet.data = g_new0(InetSocketAddress, 1);
addr->u.inet.data->host = g_strdup(host ?: SD_DEFAULT_ADDR);
addr->u.inet.data->port = g_strdup(port ?: stringify(SD_DEFAULT_PORT));
}
return addr;
}
/* Return -EIO in case of error, file descriptor on success */
static int connect_to_sdog(BDRVSheepdogState *s, Error **errp)
{
@ -951,17 +972,37 @@ static bool sd_parse_snapid_or_tag(const char *str,
return true;
}
static void sd_parse_uri(BDRVSheepdogState *s, const char *filename,
char *vdi, uint32_t *snapid, char *tag,
typedef struct {
const char *path; /* non-null iff transport is tcp */
const char *host; /* valid when transport is tcp */
int port; /* valid when transport is tcp */
char vdi[SD_MAX_VDI_LEN];
char tag[SD_MAX_VDI_TAG_LEN];
uint32_t snap_id;
/* Remainder is only for sd_config_done() */
URI *uri;
QueryParams *qp;
} SheepdogConfig;
static void sd_config_done(SheepdogConfig *cfg)
{
if (cfg->qp) {
query_params_free(cfg->qp);
}
uri_free(cfg->uri);
}
static void sd_parse_uri(SheepdogConfig *cfg, const char *filename,
Error **errp)
{
Error *err = NULL;
QueryParams *qp = NULL;
SocketAddress *addr = NULL;
bool is_unix;
URI *uri;
uri = uri_parse(filename);
memset(cfg, 0, sizeof(*cfg));
cfg->uri = uri = uri_parse(filename);
if (!uri) {
error_setg(&err, "invalid URI");
goto out;
@ -984,13 +1025,13 @@ static void sd_parse_uri(BDRVSheepdogState *s, const char *filename,
error_setg(&err, "missing file path in URI");
goto out;
}
if (g_strlcpy(vdi, uri->path + 1, SD_MAX_VDI_LEN) >= SD_MAX_VDI_LEN) {
if (g_strlcpy(cfg->vdi, uri->path + 1, SD_MAX_VDI_LEN)
>= SD_MAX_VDI_LEN) {
error_setg(&err, "VDI name is too long");
goto out;
}
qp = query_params_parse(uri->query);
addr = g_new0(SocketAddress, 1);
cfg->qp = qp = query_params_parse(uri->query);
if (is_unix) {
/* sheepdog+unix:///vdiname?socket=path */
@ -1009,44 +1050,34 @@ static void sd_parse_uri(BDRVSheepdogState *s, const char *filename,
error_setg(&err, "unexpected query parameters");
goto out;
}
addr->type = SOCKET_ADDRESS_KIND_UNIX;
addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
addr->u.q_unix.data->path = g_strdup(qp->p[0].value);
cfg->path = qp->p[0].value;
} else {
/* sheepdog[+tcp]://[host:port]/vdiname */
if (qp->n) {
error_setg(&err, "unexpected query parameters");
goto out;
}
addr->type = SOCKET_ADDRESS_KIND_INET;
addr->u.inet.data = g_new0(InetSocketAddress, 1);
addr->u.inet.data->host = g_strdup(uri->server ?: SD_DEFAULT_ADDR);
addr->u.inet.data->port = g_strdup_printf("%d",
uri->port ?: SD_DEFAULT_PORT);
cfg->host = uri->server;
cfg->port = uri->port;
}
/* snapshot tag */
if (uri->fragment) {
if (!sd_parse_snapid_or_tag(uri->fragment, snapid, tag)) {
if (!sd_parse_snapid_or_tag(uri->fragment,
&cfg->snap_id, cfg->tag)) {
error_setg(&err, "'%s' is not a valid snapshot ID",
uri->fragment);
goto out;
}
} else {
*snapid = CURRENT_VDI_ID; /* search current vdi */
cfg->snap_id = CURRENT_VDI_ID; /* search current vdi */
}
out:
if (err) {
error_propagate(errp, err);
qapi_free_SocketAddress(addr);
} else {
s->addr = addr;
sd_config_done(cfg);
}
if (qp) {
query_params_free(qp);
}
uri_free(uri);
}
/*
@ -1066,8 +1097,7 @@ out:
* You can run VMs outside the Sheepdog cluster by specifying
* `hostname' and `port' (experimental).
*/
static void parse_vdiname(BDRVSheepdogState *s, const char *filename,
char *vdi, uint32_t *snapid, char *tag,
static void parse_vdiname(SheepdogConfig *cfg, const char *filename,
Error **errp)
{
Error *err = NULL;
@ -1112,7 +1142,7 @@ static void parse_vdiname(BDRVSheepdogState *s, const char *filename,
* FIXME We to escape URI meta-characters, e.g. "x?y=z"
* produces "sheepdog://x?y=z". Because of that ...
*/
sd_parse_uri(s, uri, vdi, snapid, tag, &err);
sd_parse_uri(cfg, uri, &err);
if (err) {
/*
* ... this can fail, but the error message is misleading.
@ -1127,6 +1157,43 @@ static void parse_vdiname(BDRVSheepdogState *s, const char *filename,
g_free(uri);
}
static void sd_parse_filename(const char *filename, QDict *options,
Error **errp)
{
Error *err = NULL;
SheepdogConfig cfg;
char buf[32];
if (strstr(filename, "://")) {
sd_parse_uri(&cfg, filename, &err);
} else {
parse_vdiname(&cfg, filename, &err);
}
if (err) {
error_propagate(errp, err);
return;
}
if (cfg.host) {
qdict_set_default_str(options, "host", cfg.host);
}
if (cfg.port) {
snprintf(buf, sizeof(buf), "%d", cfg.port);
qdict_set_default_str(options, "port", buf);
}
if (cfg.path) {
qdict_set_default_str(options, "path", cfg.path);
}
qdict_set_default_str(options, "vdi", cfg.vdi);
qdict_set_default_str(options, "tag", cfg.tag);
if (cfg.snap_id) {
snprintf(buf, sizeof(buf), "%d", cfg.snap_id);
qdict_set_default_str(options, "snap-id", buf);
}
sd_config_done(&cfg);
}
static int find_vdi_name(BDRVSheepdogState *s, const char *filename,
uint32_t snapid, const char *tag, uint32_t *vid,
bool lock, Error **errp)
@ -1438,15 +1505,33 @@ static void sd_attach_aio_context(BlockDriverState *bs,
co_read_response, NULL, NULL, s);
}
/* TODO Convert to fine grained options */
static QemuOptsList runtime_opts = {
.name = "sheepdog",
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
.desc = {
{
.name = "filename",
.name = "host",
.type = QEMU_OPT_STRING,
},
{
.name = "port",
.type = QEMU_OPT_STRING,
},
{
.name = "path",
.type = QEMU_OPT_STRING,
},
{
.name = "vdi",
.type = QEMU_OPT_STRING,
},
{
.name = "snap-id",
.type = QEMU_OPT_NUMBER,
},
{
.name = "tag",
.type = QEMU_OPT_STRING,
.help = "URL to the sheepdog image",
},
{ /* end of list */ }
},
@ -1458,12 +1543,11 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
int ret, fd;
uint32_t vid = 0;
BDRVSheepdogState *s = bs->opaque;
char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN];
uint32_t snapid;
const char *host, *port, *path, *vdi, *snap_id_str, *tag;
uint64_t snap_id;
char *buf = NULL;
QemuOpts *opts;
Error *local_err = NULL;
const char *filename;
s->bs = bs;
s->aio_context = bdrv_get_aio_context(bs);
@ -1476,33 +1560,63 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
goto err_no_fd;
}
filename = qemu_opt_get(opts, "filename");
host = qemu_opt_get(opts, "host");
port = qemu_opt_get(opts, "port");
path = qemu_opt_get(opts, "path");
vdi = qemu_opt_get(opts, "vdi");
snap_id_str = qemu_opt_get(opts, "snap-id");
snap_id = qemu_opt_get_number(opts, "snap-id", CURRENT_VDI_ID);
tag = qemu_opt_get(opts, "tag");
if ((host || port) && path) {
error_setg(errp, "can't use 'path' together with 'host' or 'port'");
ret = -EINVAL;
goto err_no_fd;
}
if (!vdi) {
error_setg(errp, "parameter 'vdi' is missing");
ret = -EINVAL;
goto err_no_fd;
}
if (strlen(vdi) >= SD_MAX_VDI_LEN) {
error_setg(errp, "value of parameter 'vdi' is too long");
ret = -EINVAL;
goto err_no_fd;
}
if (snap_id > UINT32_MAX) {
snap_id = 0;
}
if (snap_id_str && !snap_id) {
error_setg(errp, "'snap-id=%s' is not a valid snapshot ID",
snap_id_str);
ret = -EINVAL;
goto err_no_fd;
}
if (!tag) {
tag = "";
}
if (tag && strlen(tag) >= SD_MAX_VDI_TAG_LEN) {
error_setg(errp, "value of parameter 'tag' is too long");
ret = -EINVAL;
goto err_no_fd;
}
s->addr = sd_socket_address(path, host, port);
QLIST_INIT(&s->inflight_aio_head);
QLIST_INIT(&s->failed_aio_head);
QLIST_INIT(&s->inflight_aiocb_head);
s->fd = -1;
memset(vdi, 0, sizeof(vdi));
memset(tag, 0, sizeof(tag));
if (strstr(filename, "://")) {
sd_parse_uri(s, filename, vdi, &snapid, tag, &local_err);
} else {
parse_vdiname(s, filename, vdi, &snapid, tag, &local_err);
}
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto err_no_fd;
}
s->fd = get_sheep_fd(s, errp);
if (s->fd < 0) {
ret = s->fd;
goto err_no_fd;
}
ret = find_vdi_name(s, vdi, snapid, tag, &vid, true, errp);
ret = find_vdi_name(s, vdi, (uint32_t)snap_id, tag, &vid, true, errp);
if (ret) {
goto err;
}
@ -1517,7 +1631,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
}
s->discard_supported = true;
if (snapid || tag[0] != '\0') {
if (snap_id || tag[0]) {
DPRINTF("%" PRIx32 " snapshot inode was open.\n", vid);
s->is_snapshot = true;
}
@ -1827,24 +1941,28 @@ static int sd_create(const char *filename, QemuOpts *opts,
char *backing_file = NULL;
char *buf = NULL;
BDRVSheepdogState *s;
char tag[SD_MAX_VDI_TAG_LEN];
uint32_t snapid;
SheepdogConfig cfg;
uint64_t max_vdi_size;
bool prealloc = false;
s = g_new0(BDRVSheepdogState, 1);
memset(tag, 0, sizeof(tag));
if (strstr(filename, "://")) {
sd_parse_uri(s, filename, s->name, &snapid, tag, &err);
sd_parse_uri(&cfg, filename, &err);
} else {
parse_vdiname(s, filename, s->name, &snapid, tag, &err);
parse_vdiname(&cfg, filename, &err);
}
if (err) {
error_propagate(errp, err);
goto out;
}
buf = cfg.port ? g_strdup_printf("%d", cfg.port) : NULL;
s->addr = sd_socket_address(cfg.path, cfg.host, buf);
g_free(buf);
strcpy(s->name, cfg.vdi);
sd_config_done(&cfg);
s->inode.vdi_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
@ -2921,7 +3039,7 @@ static BlockDriver bdrv_sheepdog = {
.format_name = "sheepdog",
.protocol_name = "sheepdog",
.instance_size = sizeof(BDRVSheepdogState),
.bdrv_needs_filename = true,
.bdrv_parse_filename = sd_parse_filename,
.bdrv_file_open = sd_open,
.bdrv_reopen_prepare = sd_reopen_prepare,
.bdrv_reopen_commit = sd_reopen_commit,
@ -2957,7 +3075,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
.format_name = "sheepdog",
.protocol_name = "sheepdog+tcp",
.instance_size = sizeof(BDRVSheepdogState),
.bdrv_needs_filename = true,
.bdrv_parse_filename = sd_parse_filename,
.bdrv_file_open = sd_open,
.bdrv_reopen_prepare = sd_reopen_prepare,
.bdrv_reopen_commit = sd_reopen_commit,
@ -2993,7 +3111,7 @@ static BlockDriver bdrv_sheepdog_unix = {
.format_name = "sheepdog",
.protocol_name = "sheepdog+unix",
.instance_size = sizeof(BDRVSheepdogState),
.bdrv_needs_filename = true,
.bdrv_parse_filename = sd_parse_filename,
.bdrv_file_open = sd_open,
.bdrv_reopen_prepare = sd_reopen_prepare,
.bdrv_reopen_commit = sd_reopen_commit,