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qemu/block/vxhs.c
Max Reitz 609f45ea95 block: Add block-specific QDict header 
There are numerous QDict functions that have been introduced for and are
used only by the block layer.  Move their declarations into an own
header file to reflect that.

While qdict_extract_subqdict() is in fact used outside of the block
layer (in util/qemu-config.c), it is still a function related very
closely to how the block layer works with nested QDicts, namely by
sometimes flattening them.  Therefore, its declaration is put into this
header as well and util/qemu-config.c includes it with a comment stating
exactly which function it needs.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20180509165530.29561-7-mreitz@redhat.com>
[Copyright note tweaked, superfluous includes dropped]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-06-15 14:49:44 +02:00

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/*
* QEMU Block driver for Veritas HyperScale (VxHS)
*
* Copyright (c) 2017 Veritas Technologies LLC.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include <qnio/qnio_api.h>
#include <sys/param.h>
#include "block/block_int.h"
#include "block/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
#include "trace.h"
#include "qemu/uri.h"
#include "qapi/error.h"
#include "qemu/uuid.h"
#include "crypto/tlscredsx509.h"
#define VXHS_OPT_FILENAME "filename"
#define VXHS_OPT_VDISK_ID "vdisk-id"
#define VXHS_OPT_SERVER "server"
#define VXHS_OPT_HOST "host"
#define VXHS_OPT_PORT "port"
/* Only accessed under QEMU global mutex */
static uint32_t vxhs_ref;
typedef enum {
VDISK_AIO_READ,
VDISK_AIO_WRITE,
} VDISKAIOCmd;
/*
* HyperScale AIO callbacks structure
*/
typedef struct VXHSAIOCB {
BlockAIOCB common;
int err;
} VXHSAIOCB;
typedef struct VXHSvDiskHostsInfo {
void *dev_handle; /* Device handle */
char *host; /* Host name or IP */
int port; /* Host's port number */
} VXHSvDiskHostsInfo;
/*
* Structure per vDisk maintained for state
*/
typedef struct BDRVVXHSState {
VXHSvDiskHostsInfo vdisk_hostinfo; /* Per host info */
char *vdisk_guid;
char *tlscredsid; /* tlscredsid */
} BDRVVXHSState;
static void vxhs_complete_aio_bh(void *opaque)
{
VXHSAIOCB *acb = opaque;
BlockCompletionFunc *cb = acb->common.cb;
void *cb_opaque = acb->common.opaque;
int ret = 0;
if (acb->err != 0) {
trace_vxhs_complete_aio(acb, acb->err);
ret = (-EIO);
}
qemu_aio_unref(acb);
cb(cb_opaque, ret);
}
/*
* Called from a libqnio thread
*/
static void vxhs_iio_callback(void *ctx, uint32_t opcode, uint32_t error)
{
VXHSAIOCB *acb = NULL;
switch (opcode) {
case IRP_READ_REQUEST:
case IRP_WRITE_REQUEST:
/*
* ctx is VXHSAIOCB*
* ctx is NULL if error is QNIOERROR_CHANNEL_HUP
*/
if (ctx) {
acb = ctx;
} else {
trace_vxhs_iio_callback(error);
goto out;
}
if (error) {
if (!acb->err) {
acb->err = error;
}
trace_vxhs_iio_callback(error);
}
aio_bh_schedule_oneshot(bdrv_get_aio_context(acb->common.bs),
vxhs_complete_aio_bh, acb);
break;
default:
if (error == QNIOERROR_HUP) {
/*
* Channel failed, spontaneous notification,
* not in response to I/O
*/
trace_vxhs_iio_callback_chnfail(error, errno);
} else {
trace_vxhs_iio_callback_unknwn(opcode, error);
}
break;
}
out:
return;
}
static QemuOptsList runtime_opts = {
.name = "vxhs",
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
.desc = {
{
.name = VXHS_OPT_FILENAME,
.type = QEMU_OPT_STRING,
.help = "URI to the Veritas HyperScale image",
},
{
.name = VXHS_OPT_VDISK_ID,
.type = QEMU_OPT_STRING,
.help = "UUID of the VxHS vdisk",
},
{
.name = "tls-creds",
.type = QEMU_OPT_STRING,
.help = "ID of the TLS/SSL credentials to use",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_tcp_opts = {
.name = "vxhs_tcp",
.head = QTAILQ_HEAD_INITIALIZER(runtime_tcp_opts.head),
.desc = {
{
.name = VXHS_OPT_HOST,
.type = QEMU_OPT_STRING,
.help = "host address (ipv4 addresses)",
},
{
.name = VXHS_OPT_PORT,
.type = QEMU_OPT_NUMBER,
.help = "port number on which VxHSD is listening (default 9999)",
.def_value_str = "9999"
},
{ /* end of list */ }
},
};
/*
* Parse incoming URI and populate *options with the host
* and device information
*/
static int vxhs_parse_uri(const char *filename, QDict *options)
{
URI *uri = NULL;
char *port;
int ret = 0;
trace_vxhs_parse_uri_filename(filename);
uri = uri_parse(filename);
if (!uri || !uri->server || !uri->path) {
uri_free(uri);
return -EINVAL;
}
qdict_put_str(options, VXHS_OPT_SERVER ".host", uri->server);
if (uri->port) {
port = g_strdup_printf("%d", uri->port);
qdict_put_str(options, VXHS_OPT_SERVER ".port", port);
g_free(port);
}
qdict_put_str(options, "vdisk-id", uri->path);
trace_vxhs_parse_uri_hostinfo(uri->server, uri->port);
uri_free(uri);
return ret;
}
static void vxhs_parse_filename(const char *filename, QDict *options,
Error **errp)
{
if (qdict_haskey(options, "vdisk-id") || qdict_haskey(options, "server")) {
error_setg(errp, "vdisk-id/server and a file name may not be specified "
"at the same time");
return;
}
if (strstr(filename, "://")) {
int ret = vxhs_parse_uri(filename, options);
if (ret < 0) {
error_setg(errp, "Invalid URI. URI should be of the form "
" vxhs://<host_ip>:<port>/<vdisk-id>");
}
}
}
static void vxhs_refresh_limits(BlockDriverState *bs, Error **errp)
{
/* XXX Does VXHS support AIO on less than 512-byte alignment? */
bs->bl.request_alignment = 512;
}
static int vxhs_init_and_ref(void)
{
if (vxhs_ref++ == 0) {
if (iio_init(QNIO_VERSION, vxhs_iio_callback)) {
return -ENODEV;
}
}
return 0;
}
static void vxhs_unref(void)
{
if (--vxhs_ref == 0) {
iio_fini();
}
}
static void vxhs_get_tls_creds(const char *id, char **cacert,
char **key, char **cert, Error **errp)
{
Object *obj;
QCryptoTLSCreds *creds;
QCryptoTLSCredsX509 *creds_x509;
obj = object_resolve_path_component(
object_get_objects_root(), id);
if (!obj) {
error_setg(errp, "No TLS credentials with id '%s'",
id);
return;
}
creds_x509 = (QCryptoTLSCredsX509 *)
object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS_X509);
if (!creds_x509) {
error_setg(errp, "Object with id '%s' is not TLS credentials",
id);
return;
}
creds = &creds_x509->parent_obj;
if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
error_setg(errp,
"Expecting TLS credentials with a client endpoint");
return;
}
/*
* Get the cacert, client_cert and client_key file names.
*/
if (!creds->dir) {
error_setg(errp, "TLS object missing 'dir' property value");
return;
}
*cacert = g_strdup_printf("%s/%s", creds->dir,
QCRYPTO_TLS_CREDS_X509_CA_CERT);
*cert = g_strdup_printf("%s/%s", creds->dir,
QCRYPTO_TLS_CREDS_X509_CLIENT_CERT);
*key = g_strdup_printf("%s/%s", creds->dir,
QCRYPTO_TLS_CREDS_X509_CLIENT_KEY);
}
static int vxhs_open(BlockDriverState *bs, QDict *options,
int bdrv_flags, Error **errp)
{
BDRVVXHSState *s = bs->opaque;
void *dev_handlep;
QDict *backing_options = NULL;
QemuOpts *opts = NULL;
QemuOpts *tcp_opts = NULL;
char *of_vsa_addr = NULL;
Error *local_err = NULL;
const char *vdisk_id_opt;
const char *server_host_opt;
int ret = 0;
char *cacert = NULL;
char *client_key = NULL;
char *client_cert = NULL;
ret = vxhs_init_and_ref();
if (ret < 0) {
ret = -EINVAL;
goto out;
}
/* Create opts info from runtime_opts and runtime_tcp_opts list */
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
tcp_opts = qemu_opts_create(&runtime_tcp_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
ret = -EINVAL;
goto out;
}
/* vdisk-id is the disk UUID */
vdisk_id_opt = qemu_opt_get(opts, VXHS_OPT_VDISK_ID);
if (!vdisk_id_opt) {
error_setg(&local_err, QERR_MISSING_PARAMETER, VXHS_OPT_VDISK_ID);
ret = -EINVAL;
goto out;
}
/* vdisk-id may contain a leading '/' */
if (strlen(vdisk_id_opt) > UUID_FMT_LEN + 1) {
error_setg(&local_err, "vdisk-id cannot be more than %d characters",
UUID_FMT_LEN);
ret = -EINVAL;
goto out;
}
s->vdisk_guid = g_strdup(vdisk_id_opt);
trace_vxhs_open_vdiskid(vdisk_id_opt);
/* get the 'server.' arguments */
qdict_extract_subqdict(options, &backing_options, VXHS_OPT_SERVER".");
qemu_opts_absorb_qdict(tcp_opts, backing_options, &local_err);
if (local_err != NULL) {
ret = -EINVAL;
goto out;
}
server_host_opt = qemu_opt_get(tcp_opts, VXHS_OPT_HOST);
if (!server_host_opt) {
error_setg(&local_err, QERR_MISSING_PARAMETER,
VXHS_OPT_SERVER"."VXHS_OPT_HOST);
ret = -EINVAL;
goto out;
}
if (strlen(server_host_opt) > MAXHOSTNAMELEN) {
error_setg(&local_err, "server.host cannot be more than %d characters",
MAXHOSTNAMELEN);
ret = -EINVAL;
goto out;
}
/* check if we got tls-creds via the --object argument */
s->tlscredsid = g_strdup(qemu_opt_get(opts, "tls-creds"));
if (s->tlscredsid) {
vxhs_get_tls_creds(s->tlscredsid, &cacert, &client_key,
&client_cert, &local_err);
if (local_err != NULL) {
ret = -EINVAL;
goto out;
}
trace_vxhs_get_creds(cacert, client_key, client_cert);
}
s->vdisk_hostinfo.host = g_strdup(server_host_opt);
s->vdisk_hostinfo.port = g_ascii_strtoll(qemu_opt_get(tcp_opts,
VXHS_OPT_PORT),
NULL, 0);
trace_vxhs_open_hostinfo(s->vdisk_hostinfo.host,
s->vdisk_hostinfo.port);
of_vsa_addr = g_strdup_printf("of://%s:%d",
s->vdisk_hostinfo.host,
s->vdisk_hostinfo.port);
/*
* Open qnio channel to storage agent if not opened before
*/
dev_handlep = iio_open(of_vsa_addr, s->vdisk_guid, 0,
cacert, client_key, client_cert);
if (dev_handlep == NULL) {
trace_vxhs_open_iio_open(of_vsa_addr);
ret = -ENODEV;
goto out;
}
s->vdisk_hostinfo.dev_handle = dev_handlep;
out:
g_free(of_vsa_addr);
qobject_unref(backing_options);
qemu_opts_del(tcp_opts);
qemu_opts_del(opts);
g_free(cacert);
g_free(client_key);
g_free(client_cert);
if (ret < 0) {
vxhs_unref();
error_propagate(errp, local_err);
g_free(s->vdisk_hostinfo.host);
g_free(s->vdisk_guid);
g_free(s->tlscredsid);
s->vdisk_guid = NULL;
}
return ret;
}
static const AIOCBInfo vxhs_aiocb_info = {
.aiocb_size = sizeof(VXHSAIOCB)
};
/*
* This allocates QEMU-VXHS callback for each IO
* and is passed to QNIO. When QNIO completes the work,
* it will be passed back through the callback.
*/
static BlockAIOCB *vxhs_aio_rw(BlockDriverState *bs, uint64_t offset,
QEMUIOVector *qiov, uint64_t size,
BlockCompletionFunc *cb, void *opaque,
VDISKAIOCmd iodir)
{
VXHSAIOCB *acb = NULL;
BDRVVXHSState *s = bs->opaque;
int iio_flags = 0;
int ret = 0;
void *dev_handle = s->vdisk_hostinfo.dev_handle;
acb = qemu_aio_get(&vxhs_aiocb_info, bs, cb, opaque);
/*
* Initialize VXHSAIOCB.
*/
acb->err = 0;
iio_flags = IIO_FLAG_ASYNC;
switch (iodir) {
case VDISK_AIO_WRITE:
ret = iio_writev(dev_handle, acb, qiov->iov, qiov->niov,
offset, size, iio_flags);
break;
case VDISK_AIO_READ:
ret = iio_readv(dev_handle, acb, qiov->iov, qiov->niov,
offset, size, iio_flags);
break;
default:
trace_vxhs_aio_rw_invalid(iodir);
goto errout;
}
if (ret != 0) {
trace_vxhs_aio_rw_ioerr(s->vdisk_guid, iodir, size, offset,
acb, ret, errno);
goto errout;
}
return &acb->common;
errout:
qemu_aio_unref(acb);
return NULL;
}
static BlockAIOCB *vxhs_aio_preadv(BlockDriverState *bs,
uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags,
BlockCompletionFunc *cb, void *opaque)
{
return vxhs_aio_rw(bs, offset, qiov, bytes, cb, opaque, VDISK_AIO_READ);
}
static BlockAIOCB *vxhs_aio_pwritev(BlockDriverState *bs,
uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags,
BlockCompletionFunc *cb, void *opaque)
{
return vxhs_aio_rw(bs, offset, qiov, bytes, cb, opaque, VDISK_AIO_WRITE);
}
static void vxhs_close(BlockDriverState *bs)
{
BDRVVXHSState *s = bs->opaque;
trace_vxhs_close(s->vdisk_guid);
g_free(s->vdisk_guid);
s->vdisk_guid = NULL;
/*
* Close vDisk device
*/
if (s->vdisk_hostinfo.dev_handle) {
iio_close(s->vdisk_hostinfo.dev_handle);
s->vdisk_hostinfo.dev_handle = NULL;
}
vxhs_unref();
/*
* Free the dynamically allocated host string etc
*/
g_free(s->vdisk_hostinfo.host);
g_free(s->tlscredsid);
s->tlscredsid = NULL;
s->vdisk_hostinfo.host = NULL;
s->vdisk_hostinfo.port = 0;
}
static int64_t vxhs_get_vdisk_stat(BDRVVXHSState *s)
{
int64_t vdisk_size = -1;
int ret = 0;
void *dev_handle = s->vdisk_hostinfo.dev_handle;
ret = iio_ioctl(dev_handle, IOR_VDISK_STAT, &vdisk_size, 0);
if (ret < 0) {
trace_vxhs_get_vdisk_stat_err(s->vdisk_guid, ret, errno);
return -EIO;
}
trace_vxhs_get_vdisk_stat(s->vdisk_guid, vdisk_size);
return vdisk_size;
}
/*
* Returns the size of vDisk in bytes. This is required
* by QEMU block upper block layer so that it is visible
* to guest.
*/
static int64_t vxhs_getlength(BlockDriverState *bs)
{
BDRVVXHSState *s = bs->opaque;
int64_t vdisk_size;
vdisk_size = vxhs_get_vdisk_stat(s);
if (vdisk_size < 0) {
return -EIO;
}
return vdisk_size;
}
static BlockDriver bdrv_vxhs = {
.format_name = "vxhs",
.protocol_name = "vxhs",
.instance_size = sizeof(BDRVVXHSState),
.bdrv_file_open = vxhs_open,
.bdrv_parse_filename = vxhs_parse_filename,
.bdrv_refresh_limits = vxhs_refresh_limits,
.bdrv_close = vxhs_close,
.bdrv_getlength = vxhs_getlength,
.bdrv_aio_preadv = vxhs_aio_preadv,
.bdrv_aio_pwritev = vxhs_aio_pwritev,
};
static void bdrv_vxhs_init(void)
{
bdrv_register(&bdrv_vxhs);
}
block_init(bdrv_vxhs_init);
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