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Re: [Qemu-devel] [PATCH v7 1/2] block/vxhs.c: Add support for a new bloc
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From: |
ashish mittal |
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Subject: |
Re: [Qemu-devel] [PATCH v7 1/2] block/vxhs.c: Add support for a new block device type called "vxhs" |
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Date: |
Wed, 8 Feb 2017 14:48:16 -0800 |
On Wed, Feb 8, 2017 at 2:35 PM, Ketan Nilangekar
<address@hidden> wrote:
>
>
> On 2/8/17, 2:21 PM, "Jeff Cody" <address@hidden> wrote:
>
> On Tue, Feb 07, 2017 at 08:18:13PM -0800, Ashish Mittal wrote:
> > From: Ashish Mittal <address@hidden>
> >
> > Source code for the qnio library that this code loads can be downloaded
> from:
> > https://github.com/VeritasHyperScale/libqnio.git
> >
>
> What branch does this use for libqnio? I was under the impression that v7
> of this series was going to work and test against the latest SSL branch
> upstream, but that doesn't appear to be the case - there are API
> differences
> and this code can't compile against the 'securify' branch on
> https://github.com/VeritasHyperScale/libqnio.git
>
> So some questions and thoughts around this:
>
> 1. If the target libqnio library version is essentially what it is on the
> libqnio 'securify' branch, then obviously this patch series can't be
> in a
> merge-ready state, since its API usage is (at the very least) stale;
>
> 2. It is getting very late (compared to feature freeze) to have patches
> that
> can't be tested or compiled against the intended libqnio release. Do
> you
> know exactly what the API differences are and the impact this has on
> this
> series? If so, can you list what that is, and/or maybe post a quick
> v8?
>
> [Ketan]
> There is only one API (iio_init) in libqnio that that was under review based
> on comments from Stefan.
> Iio_init is now changed to pass an instance id. This instance Id will be used
> to lookup local credentials for the instance. This was also supposed to be
> used for extra level of authorization on VxHS server. But that seems
> redundant based on Stefan's inputs.
> So we have decided retan the API change that is proposed in 'securify' branch
> and have the QEMU driver use that.
> Change suggested by Stefan will be done without changing the API in the
> 'securify' branch.
>
> Ashish, please post a v8 patch based on securify branch so Jeff can complete
> the review.
>
Qemu changes to work with the libqnio securify branch are not very
many - only a few lines. The configure script has some changes to
account for the library name change (libvxhs now) and the new
iio_init() interface. I will post another patch.
> 3. Or, perhaps the API on the 'securify' libqnio branch is not stable. If
> that is the case, I guess there is no choice but to wait for that to
> stabilize before posting a v8+ patch series that uses the API.
>
>
> I'll go ahead and review this series on its own merits against the libqnio
> master branch, but I wanted to point that out now in case you are able to
> do
> anything in point 2. The rest of my review will be in subsequent
> email(s).
>
>
> -Jeff
>
> > Sample command line using JSON syntax:
> > ./x86_64-softmmu/qemu-system-x86_64 -name instance-00000008 -S -vnc
> 0.0.0.0:0
> > -k en-us -vga cirrus -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
> > -msg timestamp=on
> >
> 'json:{"driver":"vxhs","vdisk-id":"c3e9095a-a5ee-4dce-afeb-2a59fb387410",
> > "server":{"host":"172.172.17.4","port":"9999"}}'
> >
> > Sample command line using URI syntax:
> > qemu-img convert -f raw -O raw -n
> > /var/lib/nova/instances/_base/0c5eacd5ebea5ed914b6a3e7b18f1ce734c386ad
> > vxhs://192.168.0.1:9999/c6718f6b-0401-441d-a8c3-1f0064d75ee0
> >
> > Signed-off-by: Ashish Mittal <address@hidden>
> > ---
> > TODO:
> > (1) valgrind report to follow soon.
> > (2) Security implementation for libqnio present in branch "securify".
> > QEMU patch will use this once it gets merged to libqnio master.
> > Please use master for building libqnio and testing with this patch.
> > (3) Rename libqnio to libvxhs. Changes ready in branch "securify".
> >
> > v7 changelog:
> > (1) IO failover code has moved out to the libqnio library.
> > (2) Fixes for issues reported by Stefan on v6.
> > (3) Incorporated the QEMUBH patch provided by Stefan.
> > This is a replacement for the pipe mechanism used earlier.
> > (4) Fixes to the buffer overflows reported in libqnio.
> > (5) Input validations in vxhs.c to prevent any buffer overflows for
> > arguments passed to libqnio.
> >
> > v6 changelog:
> > (1) Added qemu-iotests for VxHS as a new patch in the series.
> > (2) Replaced release version from 2.8 to 2.9 in block-core.json.
> >
> > v5 changelog:
> > (1) Incorporated v4 review comments.
> >
> > v4 changelog:
> > (1) Incorporated v3 review comments on QAPI changes.
> > (2) Added refcounting for device open/close.
> > Free library resources on last device close.
> >
> > v3 changelog:
> > (1) Added QAPI schema for the VxHS driver.
> >
> > v2 changelog:
> > (1) Changes done in response to v1 comments.
> >
> > block/Makefile.objs | 2 +
> > block/trace-events | 16 ++
> > block/vxhs.c | 488
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> > configure | 40 +++++
> > qapi/block-core.json | 20 ++-
> > 5 files changed, 564 insertions(+), 2 deletions(-)
> > create mode 100644 block/vxhs.c
> >
> > diff --git a/block/Makefile.objs b/block/Makefile.objs
> > index c6bd14e..75675b4 100644
> > --- a/block/Makefile.objs
> > +++ b/block/Makefile.objs
> > @@ -19,6 +19,7 @@ block-obj-$(CONFIG_LIBNFS) += nfs.o
> > block-obj-$(CONFIG_CURL) += curl.o
> > block-obj-$(CONFIG_RBD) += rbd.o
> > block-obj-$(CONFIG_GLUSTERFS) += gluster.o
> > +block-obj-$(CONFIG_VXHS) += vxhs.o
> > block-obj-$(CONFIG_ARCHIPELAGO) += archipelago.o
> > block-obj-$(CONFIG_LIBSSH2) += ssh.o
> > block-obj-y += accounting.o dirty-bitmap.o
> > @@ -39,6 +40,7 @@ rbd.o-cflags := $(RBD_CFLAGS)
> > rbd.o-libs := $(RBD_LIBS)
> > gluster.o-cflags := $(GLUSTERFS_CFLAGS)
> > gluster.o-libs := $(GLUSTERFS_LIBS)
> > +vxhs.o-libs := $(VXHS_LIBS)
> > ssh.o-cflags := $(LIBSSH2_CFLAGS)
> > ssh.o-libs := $(LIBSSH2_LIBS)
> > archipelago.o-libs := $(ARCHIPELAGO_LIBS)
> > diff --git a/block/trace-events b/block/trace-events
> > index 0bc5c0a..d5eca93 100644
> > --- a/block/trace-events
> > +++ b/block/trace-events
> > @@ -110,3 +110,19 @@ qed_aio_write_data(void *s, void *acb, int ret,
> uint64_t offset, size_t len) "s
> > qed_aio_write_prefill(void *s, void *acb, uint64_t start, size_t len,
> uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64
> > qed_aio_write_postfill(void *s, void *acb, uint64_t start, size_t len,
> uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64
> > qed_aio_write_main(void *s, void *acb, int ret, uint64_t offset,
> size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
> > +
> > +# block/vxhs.c
> > +vxhs_iio_callback(int error) "ctx is NULL: error %d"
> > +vxhs_iio_callback_chnfail(int err, int error) "QNIO channel failed, no
> i/o %d, %d"
> > +vxhs_iio_callback_unknwn(int opcode, int err) "unexpected opcode %d,
> errno %d"
> > +vxhs_aio_rw_invalid(int req) "Invalid I/O request iodir %d"
> > +vxhs_aio_rw_ioerr(char *guid, int iodir, uint64_t size, uint64_t off,
> void *acb, int ret, int err) "IO ERROR (vDisk %s) FOR : Read/Write = %d size
> = %lu offset = %lu ACB = %p. Error = %d, errno = %d"
> > +vxhs_get_vdisk_stat_err(char *guid, int ret, int err) "vDisk (%s) stat
> ioctl failed, ret = %d, errno = %d"
> > +vxhs_get_vdisk_stat(char *vdisk_guid, uint64_t vdisk_size) "vDisk %s
> stat ioctl returned size %lu"
> > +vxhs_qnio_iio_open(const char *ip) "Failed to connect to storage agent
> on host-ip %s"
> > +vxhs_complete_aio(void *acb, uint64_t ret) "aio failed acb %p ret %ld"
> > +vxhs_parse_uri_filename(const char *filename) "URI passed via
> bdrv_parse_filename %s"
> > +vxhs_qemu_init_vdisk(const char *vdisk_id) "vdisk-id from json %s"
> > +vxhs_parse_uri_hostinfo(int num, char *host, int port) "Host %d: IP
> %s, Port %d"
> > +vxhs_qemu_init(char *of_vsa_addr, int port) "Adding host %s:%d to
> BDRVVXHSState"
> > +vxhs_close(char *vdisk_guid) "Closing vdisk %s"
> > diff --git a/block/vxhs.c b/block/vxhs.c
> > new file mode 100644
> > index 0000000..997474b
> > --- /dev/null
> > +++ b/block/vxhs.c
> > @@ -0,0 +1,488 @@
> > +/*
> > + * QEMU Block driver for Veritas HyperScale (VxHS)
> > + *
> > + * 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 "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"
> > +
> > +#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"
> > +
> > +static int lib_init_failed;
> > +
> > +typedef enum {
> > + VDISK_AIO_READ,
> > + VDISK_AIO_WRITE,
> > +} VDISKAIOCmd;
> > +
> > +/*
> > + * HyperScale AIO callbacks structure
> > + */
> > +typedef struct VXHSAIOCB {
> > + BlockAIOCB common;
> > + int err;
> > + QEMUIOVector *qiov;
> > +} 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;
> > +} 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",
> > + },
> > + { /* 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 the incoming URI and populate *options with the host
> information.
> > + * URI syntax has the limitation of supporting only one host info.
> > + * To pass multiple host information, use the JSON syntax.
> > + */
> > +static int vxhs_parse_uri(const char *filename, QDict *options)
> > +{
> > + URI *uri = NULL;
> > + char *hoststr, *portstr;
> > + 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;
> > + }
> > +
> > + hoststr = g_strdup(VXHS_OPT_SERVER".host");
> > + qdict_put(options, hoststr, qstring_from_str(uri->server));
> > + g_free(hoststr);
> > +
> > + portstr = g_strdup(VXHS_OPT_SERVER".port");
> > + if (uri->port) {
> > + port = g_strdup_printf("%d", uri->port);
> > + qdict_put(options, portstr, qstring_from_str(port));
> > + g_free(port);
> > + }
> > + g_free(portstr);
> > +
> > + if (strstr(uri->path, "vxhs") == NULL) {
> > + qdict_put(options, "vdisk-id", qstring_from_str(uri->path));
> > + }
> > +
> > + trace_vxhs_parse_uri_hostinfo(1, 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 int vxhs_open(BlockDriverState *bs, QDict *options,
> > + int bdrv_flags, Error **errp)
> > +{
> > + BDRVVXHSState *s = bs->opaque;
> > + void *dev_handlep = NULL;
> > + QDict *backing_options = NULL;
> > + QemuOpts *opts, *tcp_opts;
> > + char *of_vsa_addr = NULL;
> > + Error *local_err = NULL;
> > + const char *vdisk_id_opt;
> > + const char *server_host_opt;
> > + char *str = NULL;
> > + int ret = 0;
> > +
> > + if (lib_init_failed) {
> > + return -ENODEV;
> > + }
> > + opts = qemu_opts_create(&runtime_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(errp, "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_qemu_init_vdisk(vdisk_id_opt);
> > +
> > + str = g_strdup_printf(VXHS_OPT_SERVER".");
> > + qdict_extract_subqdict(options, &backing_options, str);
> > +
> > + /* Create opts info from runtime_tcp_opts list */
> > + tcp_opts = qemu_opts_create(&runtime_tcp_opts, NULL, 0,
> &error_abort);
> > + qemu_opts_absorb_qdict(tcp_opts, backing_options, &local_err);
> > + if (local_err) {
> > + qdict_del(backing_options, str);
> > + qemu_opts_del(tcp_opts);
> > + 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(errp, "server.host cannot be more than %d
> characters",
> > + MAXHOSTNAMELEN);
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > +
> > + 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_qemu_init(s->vdisk_hostinfo.host,
> > + s->vdisk_hostinfo.port);
> > +
> > + qdict_del(backing_options, str);
> > + qemu_opts_del(tcp_opts);
> > +
> > + 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);
> > + if (dev_handlep == NULL) {
> > + trace_vxhs_qnio_iio_open(of_vsa_addr);
> > + ret = -ENODEV;
> > + goto out;
> > + }
> > + s->vdisk_hostinfo.dev_handle = dev_handlep;
> > +
> > +out:
> > + g_free(str);
> > + g_free(of_vsa_addr);
> > + QDECREF(backing_options);
> > + qemu_opts_del(opts);
> > +
> > + if (ret < 0) {
> > + error_propagate(errp, local_err);
> > + g_free(s->vdisk_hostinfo.host);
> > + g_free(s->vdisk_guid);
> > + s->vdisk_guid = NULL;
> > + errno = -ret;
> > + }
> > +
> > + 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, int64_t
> sector_num,
> > + QEMUIOVector *qiov, int nb_sectors,
> > + BlockCompletionFunc *cb, void *opaque,
> > + VDISKAIOCmd iodir)
> > +{
> > + VXHSAIOCB *acb = NULL;
> > + BDRVVXHSState *s = bs->opaque;
> > + size_t size;
> > + uint64_t offset;
> > + int iio_flags = 0;
> > + int ret = 0;
> > + void *dev_handle = s->vdisk_hostinfo.dev_handle;
> > +
> > + offset = sector_num * BDRV_SECTOR_SIZE;
> > + size = nb_sectors * BDRV_SECTOR_SIZE;
> > + acb = qemu_aio_get(&vxhs_aiocb_info, bs, cb, opaque);
> > +
> > + /*
> > + * Initialize VXHSAIOCB.
> > + */
> > + acb->err = 0;
> > + acb->qiov = qiov;
> > +
> > + iio_flags = IIO_FLAG_ASYNC;
> > +
> > + switch (iodir) {
> > + case VDISK_AIO_WRITE:
> > + ret = iio_writev(dev_handle, acb, qiov->iov, qiov->niov,
> > + offset, (uint64_t)size, iio_flags);
> > + break;
> > + case VDISK_AIO_READ:
> > + ret = iio_readv(dev_handle, acb, qiov->iov, qiov->niov,
> > + offset, (uint64_t)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_readv(BlockDriverState *bs,
> > + int64_t sector_num, QEMUIOVector
> *qiov,
> > + int nb_sectors,
> > + BlockCompletionFunc *cb, void
> *opaque)
> > +{
> > + return vxhs_aio_rw(bs, sector_num, qiov, nb_sectors, cb,
> > + opaque, VDISK_AIO_READ);
> > +}
> > +
> > +static BlockAIOCB *vxhs_aio_writev(BlockDriverState *bs,
> > + int64_t sector_num, QEMUIOVector
> *qiov,
> > + int nb_sectors,
> > + BlockCompletionFunc *cb, void
> *opaque)
> > +{
> > + return vxhs_aio_rw(bs, sector_num, qiov, nb_sectors,
> > + 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;
> > + }
> > +
> > + /*
> > + * Free the dynamically allocated host string
> > + */
> > + g_free(s->vdisk_hostinfo.host);
> > + 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_close = vxhs_close,
> > + .bdrv_getlength = vxhs_getlength,
> > + .bdrv_aio_readv = vxhs_aio_readv,
> > + .bdrv_aio_writev = vxhs_aio_writev,
> > +};
> > +
> > +static void bdrv_vxhs_init(void)
> > +{
> > + lib_init_failed = iio_init(QNIO_VERSION, vxhs_iio_callback);
> > + bdrv_register(&bdrv_vxhs);
> > +}
> > +
> > +block_init(bdrv_vxhs_init);
> > diff --git a/configure b/configure
> > index 6325339..ba9ad0a 100755
> > --- a/configure
> > +++ b/configure
> > @@ -321,6 +321,7 @@ numa=""
> > tcmalloc="no"
> > jemalloc="no"
> > replication="yes"
> > +vxhs=""
> >
> > # parse CC options first
> > for opt do
> > @@ -1170,6 +1171,10 @@ for opt do
> > ;;
> > --enable-replication) replication="yes"
> > ;;
> > + --disable-vxhs) vxhs="no"
> > + ;;
> > + --enable-vxhs) vxhs="yes"
> > + ;;
> > *)
> > echo "ERROR: unknown option $opt"
> > echo "Try '$0 --help' for more information"
> > @@ -1403,6 +1408,7 @@ disabled with --disable-FEATURE, default is
> enabled if available:
> > tcmalloc tcmalloc support
> > jemalloc jemalloc support
> > replication replication support
> > + vxhs Veritas HyperScale vDisk backend support
> >
> > NOTE: The object files are built at the place where configure is
> launched
> > EOF
> > @@ -4748,6 +4754,33 @@ if test "$modules" = "yes" && test
> "$LD_REL_FLAGS" = ""; then
> > fi
> >
> > ##########################################
> > +# Veritas HyperScale block driver VxHS
> > +# Check if libqnio is installed
> > +
> > +if test "$vxhs" != "no" ; then
> > + cat > $TMPC <<EOF
> > +#include <stdint.h>
> > +#include <qnio/qnio_api.h>
> > +
> > +void *vxhs_callback;
> > +
> > +int main(void) {
> > + iio_init(QNIO_VERSION, vxhs_callback);
> > + return 0;
> > +}
> > +EOF
> > + vxhs_libs="-lqnio"
> > + if compile_prog "" "$vxhs_libs" ; then
> > + vxhs=yes
> > + else
> > + if test "$vxhs" = "yes" ; then
> > + feature_not_found "vxhs block device" "Install libqnio See
> github"
> > + fi
> > + vxhs=no
> > + fi
> > +fi
> > +
> > +##########################################
> > # End of CC checks
> > # After here, no more $cc or $ld runs
> >
> > @@ -5114,6 +5147,7 @@ echo "tcmalloc support $tcmalloc"
> > echo "jemalloc support $jemalloc"
> > echo "avx2 optimization $avx2_opt"
> > echo "replication support $replication"
> > +echo "VxHS block device $vxhs"
> >
> > if test "$sdl_too_old" = "yes"; then
> > echo "-> Your SDL version is too old - please upgrade to have SDL
> support"
> > @@ -5729,6 +5763,12 @@ if test "$pthread_setname_np" = "yes" ; then
> > echo "CONFIG_PTHREAD_SETNAME_NP=y" >> $config_host_mak
> > fi
> >
> > +if test "$vxhs" = "yes" ; then
> > + echo "CONFIG_VXHS=y" >> $config_host_mak
> > + echo "VXHS_CFLAGS=$vxhs_cflags" >> $config_host_mak
> > + echo "VXHS_LIBS=$vxhs_libs" >> $config_host_mak
> > +fi
> > +
> > if test "$tcg_interpreter" = "yes"; then
> > QEMU_INCLUDES="-I\$(SRC_PATH)/tcg/tci $QEMU_INCLUDES"
> > elif test "$ARCH" = "sparc64" ; then
> > diff --git a/qapi/block-core.json b/qapi/block-core.json
> > index 932f5bb..f37df56 100644
> > --- a/qapi/block-core.json
> > +++ b/qapi/block-core.json
> > @@ -2110,6 +2110,7 @@
> > # @nfs: Since 2.8
> > # @replication: Since 2.8
> > # @ssh: Since 2.8
> > +# @vxhs: Since 2.9
> > #
> > # Since: 2.0
> > ##
> > @@ -2119,7 +2120,7 @@
> > 'host_device', 'http', 'https', 'luks', 'nbd', 'nfs',
> 'null-aio',
> > 'null-co', 'parallels', 'qcow', 'qcow2', 'qed', 'quorum',
> 'raw',
> > 'replication', 'ssh', 'vdi', 'vhdx', 'vmdk', 'vpc',
> > - 'vvfat' ] }
> > + 'vvfat','vxhs' ] }
> >
> > ##
> > # @BlockdevOptionsFile:
> > @@ -2744,6 +2745,20 @@
> > 'data': { '*offset': 'int', '*size': 'int' } }
> >
> > ##
> > +# @BlockdevOptionsVxHS:
> > +#
> > +# Driver specific block device options for VxHS
> > +#
> > +# @vdisk-id: UUID of VxHS volume
> > +# @server: vxhs server IP, port
> > +#
> > +# Since: 2.9
> > +##
> > +{ 'struct': 'BlockdevOptionsVxHS',
> > + 'data': { 'vdisk-id': 'str',
> > + 'server': 'InetSocketAddress' } }
> > +
> > +##
> > # @BlockdevOptions:
> > #
> > # Options for creating a block device. Many options are available for
> all
> > @@ -2806,7 +2821,8 @@
> > 'vhdx': 'BlockdevOptionsGenericFormat',
> > 'vmdk': 'BlockdevOptionsGenericCOWFormat',
> > 'vpc': 'BlockdevOptionsGenericFormat',
> > - 'vvfat': 'BlockdevOptionsVVFAT'
> > + 'vvfat': 'BlockdevOptionsVVFAT',
> > + 'vxhs': 'BlockdevOptionsVxHS'
> > } }
> >
> > ##
> > --
> > 1.8.3.1
> >
>
>