[mirror_qemu.git] / block / nfs.c

/*
 * QEMU Block driver for native access to files on NFS shares
 *
 * Copyright (c) 2014 Peter Lieven <pl@kamp.de>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "config-host.h"

#include <poll.h>
#include "qemu-common.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "block/block_int.h"
#include "trace.h"
#include "qemu/iov.h"
#include "qemu/uri.h"
#include "sysemu/sysemu.h"
#include <nfsc/libnfs.h>

typedef struct NFSClient {
    struct nfs_context *context;
    struct nfsfh *fh;
    int events;
    bool has_zero_init;
    AioContext *aio_context;
} NFSClient;

typedef struct NFSRPC {
    int ret;
    int complete;
    QEMUIOVector *iov;
    struct stat *st;
    Coroutine *co;
    QEMUBH *bh;
    NFSClient *client;
} NFSRPC;

static void nfs_process_read(void *arg);
static void nfs_process_write(void *arg);

static void nfs_set_events(NFSClient *client)
{
    int ev = nfs_which_events(client->context);
    if (ev != client->events) {
        aio_set_fd_handler(client->aio_context,
                           nfs_get_fd(client->context),
                           (ev & POLLIN) ? nfs_process_read : NULL,
                           (ev & POLLOUT) ? nfs_process_write : NULL,
                           client);

    }
    client->events = ev;
}

static void nfs_process_read(void *arg)
{
    NFSClient *client = arg;
    nfs_service(client->context, POLLIN);
    nfs_set_events(client);
}

static void nfs_process_write(void *arg)
{
    NFSClient *client = arg;
    nfs_service(client->context, POLLOUT);
    nfs_set_events(client);
}

static void nfs_co_init_task(NFSClient *client, NFSRPC *task)
{
    *task = (NFSRPC) {
        .co             = qemu_coroutine_self(),
        .client         = client,
    };
}

static void nfs_co_generic_bh_cb(void *opaque)
{
    NFSRPC *task = opaque;
    qemu_bh_delete(task->bh);
    qemu_coroutine_enter(task->co, NULL);
}

static void
nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data,
                  void *private_data)
{
    NFSRPC *task = private_data;
    task->complete = 1;
    task->ret = ret;
    if (task->ret > 0 && task->iov) {
        if (task->ret <= task->iov->size) {
            qemu_iovec_from_buf(task->iov, 0, data, task->ret);
        } else {
            task->ret = -EIO;
        }
    }
    if (task->ret == 0 && task->st) {
        memcpy(task->st, data, sizeof(struct stat));
    }
    if (task->ret < 0) {
        error_report("NFS Error: %s", nfs_get_error(nfs));
    }
    if (task->co) {
        task->bh = aio_bh_new(task->client->aio_context,
                              nfs_co_generic_bh_cb, task);
        qemu_bh_schedule(task->bh);
    }
}

static int coroutine_fn nfs_co_readv(BlockDriverState *bs,
                                     int64_t sector_num, int nb_sectors,
                                     QEMUIOVector *iov)
{
    NFSClient *client = bs->opaque;
    NFSRPC task;

    nfs_co_init_task(client, &task);
    task.iov = iov;

    if (nfs_pread_async(client->context, client->fh,
                        sector_num * BDRV_SECTOR_SIZE,
                        nb_sectors * BDRV_SECTOR_SIZE,
                        nfs_co_generic_cb, &task) != 0) {
        return -ENOMEM;
    }

    while (!task.complete) {
        nfs_set_events(client);
        qemu_coroutine_yield();
    }

    if (task.ret < 0) {
        return task.ret;
    }

    /* zero pad short reads */
    if (task.ret < iov->size) {
        qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret);
    }

    return 0;
}

static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
                                        int64_t sector_num, int nb_sectors,
                                        QEMUIOVector *iov)
{
    NFSClient *client = bs->opaque;
    NFSRPC task;
    char *buf = NULL;

    nfs_co_init_task(client, &task);

    buf = g_malloc(nb_sectors * BDRV_SECTOR_SIZE);
    qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);

    if (nfs_pwrite_async(client->context, client->fh,
                         sector_num * BDRV_SECTOR_SIZE,
                         nb_sectors * BDRV_SECTOR_SIZE,
                         buf, nfs_co_generic_cb, &task) != 0) {
        g_free(buf);
        return -ENOMEM;
    }

    while (!task.complete) {
        nfs_set_events(client);
        qemu_coroutine_yield();
    }

    g_free(buf);

    if (task.ret != nb_sectors * BDRV_SECTOR_SIZE) {
        return task.ret < 0 ? task.ret : -EIO;
    }

    return 0;
}

static int coroutine_fn nfs_co_flush(BlockDriverState *bs)
{
    NFSClient *client = bs->opaque;
    NFSRPC task;

    nfs_co_init_task(client, &task);

    if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
                        &task) != 0) {
        return -ENOMEM;
    }

    while (!task.complete) {
        nfs_set_events(client);
        qemu_coroutine_yield();
    }

    return task.ret;
}

/* TODO Convert to fine grained options */
static QemuOptsList runtime_opts = {
    .name = "nfs",
    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
    .desc = {
        {
            .name = "filename",
            .type = QEMU_OPT_STRING,
            .help = "URL to the NFS file",
        },
        { /* end of list */ }
    },
};

static void nfs_detach_aio_context(BlockDriverState *bs)
{
    NFSClient *client = bs->opaque;

    aio_set_fd_handler(client->aio_context,
                       nfs_get_fd(client->context),
                       NULL, NULL, NULL);
    client->events = 0;
}

static void nfs_attach_aio_context(BlockDriverState *bs,
                                   AioContext *new_context)
{
    NFSClient *client = bs->opaque;

    client->aio_context = new_context;
    nfs_set_events(client);
}

static void nfs_client_close(NFSClient *client)
{
    if (client->context) {
        if (client->fh) {
            nfs_close(client->context, client->fh);
        }
        aio_set_fd_handler(client->aio_context,
                           nfs_get_fd(client->context),
                           NULL, NULL, NULL);
        nfs_destroy_context(client->context);
    }
    memset(client, 0, sizeof(NFSClient));
}

static void nfs_file_close(BlockDriverState *bs)
{
    NFSClient *client = bs->opaque;
    nfs_client_close(client);
}

static int64_t nfs_client_open(NFSClient *client, const char *filename,
                               int flags, Error **errp)
{
    int ret = -EINVAL, i;
    struct stat st;
    URI *uri;
    QueryParams *qp = NULL;
    char *file = NULL, *strp = NULL;

    uri = uri_parse(filename);
    if (!uri) {
        error_setg(errp, "Invalid URL specified");
        goto fail;
    }
    if (!uri->server) {
        error_setg(errp, "Invalid URL specified");
        goto fail;
    }
    strp = strrchr(uri->path, '/');
    if (strp == NULL) {
        error_setg(errp, "Invalid URL specified");
        goto fail;
    }
    file = g_strdup(strp);
    *strp = 0;

    client->context = nfs_init_context();
    if (client->context == NULL) {
        error_setg(errp, "Failed to init NFS context");
        goto fail;
    }

    qp = query_params_parse(uri->query);
    for (i = 0; i < qp->n; i++) {
        if (!qp->p[i].value) {
            error_setg(errp, "Value for NFS parameter expected: %s",
                       qp->p[i].name);
            goto fail;
        }
        if (!strncmp(qp->p[i].name, "uid", 3)) {
            nfs_set_uid(client->context, atoi(qp->p[i].value));
        } else if (!strncmp(qp->p[i].name, "gid", 3)) {
            nfs_set_gid(client->context, atoi(qp->p[i].value));
        } else if (!strncmp(qp->p[i].name, "tcp-syncnt", 10)) {
            nfs_set_tcp_syncnt(client->context, atoi(qp->p[i].value));
        } else {
            error_setg(errp, "Unknown NFS parameter name: %s",
                       qp->p[i].name);
            goto fail;
        }
    }

    ret = nfs_mount(client->context, uri->server, uri->path);
    if (ret < 0) {
        error_setg(errp, "Failed to mount nfs share: %s",
                   nfs_get_error(client->context));
        goto fail;
    }

    if (flags & O_CREAT) {
        ret = nfs_creat(client->context, file, 0600, &client->fh);
        if (ret < 0) {
            error_setg(errp, "Failed to create file: %s",
                       nfs_get_error(client->context));
            goto fail;
        }
    } else {
        ret = nfs_open(client->context, file, flags, &client->fh);
        if (ret < 0) {
            error_setg(errp, "Failed to open file : %s",
                       nfs_get_error(client->context));
            goto fail;
        }
    }

    ret = nfs_fstat(client->context, client->fh, &st);
    if (ret < 0) {
        error_setg(errp, "Failed to fstat file: %s",
                   nfs_get_error(client->context));
        goto fail;
    }

    ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
    client->has_zero_init = S_ISREG(st.st_mode);
    goto out;
fail:
    nfs_client_close(client);
out:
    if (qp) {
        query_params_free(qp);
    }
    uri_free(uri);
    g_free(file);
    return ret;
}

static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags,
                         Error **errp) {
    NFSClient *client = bs->opaque;
    int64_t ret;
    QemuOpts *opts;
    Error *local_err = NULL;

    client->aio_context = bdrv_get_aio_context(bs);

    opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
    qemu_opts_absorb_qdict(opts, options, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return -EINVAL;
    }
    ret = nfs_client_open(client, qemu_opt_get(opts, "filename"),
                          (flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
                          errp);
    if (ret < 0) {
        return ret;
    }
    bs->total_sectors = ret;
    return 0;
}

static int nfs_file_create(const char *url, QEMUOptionParameter *options,
                           Error **errp)
{
    int ret = 0;
    int64_t total_size = 0;
    NFSClient *client = g_malloc0(sizeof(NFSClient));

    client->aio_context = qemu_get_aio_context();

    /* Read out options */
    while (options && options->name) {
        if (!strcmp(options->name, "size")) {
            total_size = options->value.n;
        }
        options++;
    }

    ret = nfs_client_open(client, url, O_CREAT, errp);
    if (ret < 0) {
        goto out;
    }
    ret = nfs_ftruncate(client->context, client->fh, total_size);
    nfs_client_close(client);
out:
    g_free(client);
    return ret;
}

static int nfs_has_zero_init(BlockDriverState *bs)
{
    NFSClient *client = bs->opaque;
    return client->has_zero_init;
}

static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
{
    NFSClient *client = bs->opaque;
    NFSRPC task = {0};
    struct stat st;

    task.st = &st;
    if (nfs_fstat_async(client->context, client->fh, nfs_co_generic_cb,
                        &task) != 0) {
        return -ENOMEM;
    }

    while (!task.complete) {
        nfs_set_events(client);
        aio_poll(client->aio_context, true);
    }

    return (task.ret < 0 ? task.ret : st.st_blocks * st.st_blksize);
}

static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
{
    NFSClient *client = bs->opaque;
    return nfs_ftruncate(client->context, client->fh, offset);
}

static BlockDriver bdrv_nfs = {
    .format_name                    = "nfs",
    .protocol_name                  = "nfs",

    .instance_size                  = sizeof(NFSClient),
    .bdrv_needs_filename            = true,
    .bdrv_has_zero_init             = nfs_has_zero_init,
    .bdrv_get_allocated_file_size   = nfs_get_allocated_file_size,
    .bdrv_truncate                  = nfs_file_truncate,

    .bdrv_file_open                 = nfs_file_open,
    .bdrv_close                     = nfs_file_close,
    .bdrv_create                    = nfs_file_create,

    .bdrv_co_readv                  = nfs_co_readv,
    .bdrv_co_writev                 = nfs_co_writev,
    .bdrv_co_flush_to_disk          = nfs_co_flush,

    .bdrv_detach_aio_context        = nfs_detach_aio_context,
    .bdrv_attach_aio_context        = nfs_attach_aio_context,
};

static void nfs_block_init(void)
{
    bdrv_register(&bdrv_nfs);
}

block_init(nfs_block_init);
Commit	Line	Data
6542aa9c PL	1	/*
	2	* QEMU Block driver for native access to files on NFS shares
	3	*
	4	* Copyright (c) 2014 Peter Lieven <pl@kamp.de>
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24
	25	#include "config-host.h"
	26
	27	#include <poll.h>
	28	#include "qemu-common.h"
	29	#include "qemu/config-file.h"
	30	#include "qemu/error-report.h"
	31	#include "block/block_int.h"
	32	#include "trace.h"
	33	#include "qemu/iov.h"
	34	#include "qemu/uri.h"
	35	#include "sysemu/sysemu.h"
	36	#include <nfsc/libnfs.h>
	37
	38	typedef struct NFSClient {
	39	struct nfs_context *context;
	40	struct nfsfh *fh;
	41	int events;
	42	bool has_zero_init;
471799d1	43	AioContext *aio_context;
6542aa9c PL	44	} NFSClient;
	45
	46	typedef struct NFSRPC {
	47	int ret;
	48	int complete;
	49	QEMUIOVector *iov;
	50	struct stat *st;
	51	Coroutine *co;
	52	QEMUBH *bh;
471799d1	53	NFSClient *client;
6542aa9c PL	54	} NFSRPC;
	55
	56	static void nfs_process_read(void *arg);
	57	static void nfs_process_write(void *arg);
	58
	59	static void nfs_set_events(NFSClient *client)
	60	{
	61	int ev = nfs_which_events(client->context);
	62	if (ev != client->events) {
471799d1 SH	63	aio_set_fd_handler(client->aio_context,
	64	nfs_get_fd(client->context),
	65	(ev & POLLIN) ? nfs_process_read : NULL,
	66	(ev & POLLOUT) ? nfs_process_write : NULL,
	67	client);
6542aa9c PL	68
	69	}
	70	client->events = ev;
	71	}
	72
	73	static void nfs_process_read(void *arg)
	74	{
	75	NFSClient *client = arg;
	76	nfs_service(client->context, POLLIN);
	77	nfs_set_events(client);
	78	}
	79
	80	static void nfs_process_write(void *arg)
	81	{
	82	NFSClient *client = arg;
	83	nfs_service(client->context, POLLOUT);
	84	nfs_set_events(client);
	85	}
	86
	87	static void nfs_co_init_task(NFSClient client, NFSRPC task)
	88	{
	89	*task = (NFSRPC) {
471799d1 SH	90	.co = qemu_coroutine_self(),
471799d1 SH	91	.client = client,
6542aa9c PL	92	};
	93	}
	94
	95	static void nfs_co_generic_bh_cb(void *opaque)
	96	{
	97	NFSRPC *task = opaque;
	98	qemu_bh_delete(task->bh);
	99	qemu_coroutine_enter(task->co, NULL);
	100	}
	101
	102	static void
	103	nfs_co_generic_cb(int ret, struct nfs_context nfs, void data,
	104	void *private_data)
	105	{
	106	NFSRPC *task = private_data;
	107	task->complete = 1;
	108	task->ret = ret;
	109	if (task->ret > 0 && task->iov) {
	110	if (task->ret <= task->iov->size) {
	111	qemu_iovec_from_buf(task->iov, 0, data, task->ret);
	112	} else {
	113	task->ret = -EIO;
	114	}
	115	}
	116	if (task->ret == 0 && task->st) {
	117	memcpy(task->st, data, sizeof(struct stat));
	118	}
20fccb18 PL	119	if (task->ret < 0) {
	120	error_report("NFS Error: %s", nfs_get_error(nfs));
	121	}
6542aa9c	122	if (task->co) {
471799d1 SH	123	task->bh = aio_bh_new(task->client->aio_context,
471799d1 SH	124	nfs_co_generic_bh_cb, task);
6542aa9c PL	125	qemu_bh_schedule(task->bh);
	126	}
	127	}
	128
	129	static int coroutine_fn nfs_co_readv(BlockDriverState *bs,
	130	int64_t sector_num, int nb_sectors,
	131	QEMUIOVector *iov)
	132	{
	133	NFSClient *client = bs->opaque;
	134	NFSRPC task;
	135
	136	nfs_co_init_task(client, &task);
	137	task.iov = iov;
	138
	139	if (nfs_pread_async(client->context, client->fh,
	140	sector_num * BDRV_SECTOR_SIZE,
	141	nb_sectors * BDRV_SECTOR_SIZE,
	142	nfs_co_generic_cb, &task) != 0) {
	143	return -ENOMEM;
	144	}
	145
	146	while (!task.complete) {
	147	nfs_set_events(client);
	148	qemu_coroutine_yield();
	149	}
	150
	151	if (task.ret < 0) {
	152	return task.ret;
	153	}
	154
	155	/* zero pad short reads */
	156	if (task.ret < iov->size) {
	157	qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret);
	158	}
	159
	160	return 0;
	161	}
	162
	163	static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
	164	int64_t sector_num, int nb_sectors,
	165	QEMUIOVector *iov)
	166	{
	167	NFSClient *client = bs->opaque;
	168	NFSRPC task;
	169	char *buf = NULL;
	170
	171	nfs_co_init_task(client, &task);
	172
	173	buf = g_malloc(nb_sectors * BDRV_SECTOR_SIZE);
	174	qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
	175
	176	if (nfs_pwrite_async(client->context, client->fh,
	177	sector_num * BDRV_SECTOR_SIZE,
	178	nb_sectors * BDRV_SECTOR_SIZE,
	179	buf, nfs_co_generic_cb, &task) != 0) {
	180	g_free(buf);
	181	return -ENOMEM;
	182	}
	183
	184	while (!task.complete) {
	185	nfs_set_events(client);
	186	qemu_coroutine_yield();
	187	}
	188
189	g_free(buf);
190
191	if (task.ret != nb_sectors * BDRV_SECTOR_SIZE) {
192	return task.ret < 0 ? task.ret : -EIO;
193	}
194
195	return 0;
196	}
197
198	static int coroutine_fn nfs_co_flush(BlockDriverState *bs)
199	{
200	NFSClient *client = bs->opaque;
201	NFSRPC task;
202
203	nfs_co_init_task(client, &task);
204
205	if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
206	&task) != 0) {
207	return -ENOMEM;
208	}
209
210	while (!task.complete) {
211	nfs_set_events(client);
212	qemu_coroutine_yield();
213	}
214
215	return task.ret;
216	}
217
218	/* TODO Convert to fine grained options */
219	static QemuOptsList runtime_opts = {
220	.name = "nfs",
221	.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
222	.desc = {
223	{
224	.name = "filename",
225	.type = QEMU_OPT_STRING,
226	.help = "URL to the NFS file",
227	},
228	{ /* end of list */ }
229	},
230	};
231
471799d1 SH	232	static void nfs_detach_aio_context(BlockDriverState *bs)
	233	{
	234	NFSClient *client = bs->opaque;
	235
	236	aio_set_fd_handler(client->aio_context,
	237	nfs_get_fd(client->context),
	238	NULL, NULL, NULL);
	239	client->events = 0;
	240	}
	241
	242	static void nfs_attach_aio_context(BlockDriverState *bs,
	243	AioContext *new_context)
	244	{
	245	NFSClient *client = bs->opaque;
	246
	247	client->aio_context = new_context;
	248	nfs_set_events(client);
	249	}
	250
6542aa9c PL	251	static void nfs_client_close(NFSClient *client)
	252	{
	253	if (client->context) {
	254	if (client->fh) {
	255	nfs_close(client->context, client->fh);
	256	}
471799d1 SH	257	aio_set_fd_handler(client->aio_context,
	258	nfs_get_fd(client->context),
	259	NULL, NULL, NULL);
6542aa9c PL	260	nfs_destroy_context(client->context);
	261	}
	262	memset(client, 0, sizeof(NFSClient));
	263	}
	264
	265	static void nfs_file_close(BlockDriverState *bs)
	266	{
	267	NFSClient *client = bs->opaque;
	268	nfs_client_close(client);
	269	}
	270
	271	static int64_t nfs_client_open(NFSClient client, const char filename,
	272	int flags, Error **errp)
	273	{
	274	int ret = -EINVAL, i;
	275	struct stat st;
	276	URI *uri;
	277	QueryParams *qp = NULL;
	278	char file = NULL, strp = NULL;
	279
	280	uri = uri_parse(filename);
	281	if (!uri) {
	282	error_setg(errp, "Invalid URL specified");
5f4d5e1a HR	283	goto fail;
	284	}
	285	if (!uri->server) {
	286	error_setg(errp, "Invalid URL specified");
6542aa9c PL	287	goto fail;
	288	}
	289	strp = strrchr(uri->path, '/');
	290	if (strp == NULL) {
	291	error_setg(errp, "Invalid URL specified");
	292	goto fail;
	293	}
	294	file = g_strdup(strp);
	295	*strp = 0;
	296
	297	client->context = nfs_init_context();
	298	if (client->context == NULL) {
	299	error_setg(errp, "Failed to init NFS context");
	300	goto fail;
	301	}
	302
	303	qp = query_params_parse(uri->query);
	304	for (i = 0; i < qp->n; i++) {
	305	if (!qp->p[i].value) {
	306	error_setg(errp, "Value for NFS parameter expected: %s",
	307	qp->p[i].name);
	308	goto fail;
	309	}
	310	if (!strncmp(qp->p[i].name, "uid", 3)) {
	311	nfs_set_uid(client->context, atoi(qp->p[i].value));
	312	} else if (!strncmp(qp->p[i].name, "gid", 3)) {
	313	nfs_set_gid(client->context, atoi(qp->p[i].value));
	314	} else if (!strncmp(qp->p[i].name, "tcp-syncnt", 10)) {
	315	nfs_set_tcp_syncnt(client->context, atoi(qp->p[i].value));
	316	} else {
	317	error_setg(errp, "Unknown NFS parameter name: %s",
	318	qp->p[i].name);
	319	goto fail;
	320	}
	321	}
	322
	323	ret = nfs_mount(client->context, uri->server, uri->path);
	324	if (ret < 0) {
	325	error_setg(errp, "Failed to mount nfs share: %s",
	326	nfs_get_error(client->context));
	327	goto fail;
	328	}
	329
	330	if (flags & O_CREAT) {
	331	ret = nfs_creat(client->context, file, 0600, &client->fh);
	332	if (ret < 0) {
	333	error_setg(errp, "Failed to create file: %s",
	334	nfs_get_error(client->context));
	335	goto fail;
	336	}
	337	} else {
	338	ret = nfs_open(client->context, file, flags, &client->fh);
	339	if (ret < 0) {
	340	error_setg(errp, "Failed to open file : %s",
	341	nfs_get_error(client->context));
	342	goto fail;
	343	}
	344	}
	345
	346	ret = nfs_fstat(client->context, client->fh, &st);
	347	if (ret < 0) {
	348	error_setg(errp, "Failed to fstat file: %s",
	349	nfs_get_error(client->context));
	350	goto fail;
351	}
352
353	ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
354	client->has_zero_init = S_ISREG(st.st_mode);
355	goto out;
356	fail:
357	nfs_client_close(client);
358	out:
359	if (qp) {
360	query_params_free(qp);
361	}
362	uri_free(uri);
363	g_free(file);
364	return ret;
365	}
366
367	static int nfs_file_open(BlockDriverState bs, QDict options, int flags,
368	Error **errp) {
369	NFSClient *client = bs->opaque;
370	int64_t ret;
371	QemuOpts *opts;
372	Error *local_err = NULL;
373
471799d1 SH	374	client->aio_context = bdrv_get_aio_context(bs);
471799d1 SH	375
6542aa9c PL	376	opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
6542aa9c PL	377	qemu_opts_absorb_qdict(opts, options, &local_err);
0fb6395c	378	if (local_err) {
6542aa9c PL	379	error_propagate(errp, local_err);
	380	return -EINVAL;
	381	}
	382	ret = nfs_client_open(client, qemu_opt_get(opts, "filename"),
	383	(flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
	384	errp);
	385	if (ret < 0) {
	386	return ret;
	387	}
	388	bs->total_sectors = ret;
	389	return 0;
	390	}
	391
	392	static int nfs_file_create(const char url, QEMUOptionParameter options,
	393	Error **errp)
	394	{
	395	int ret = 0;
	396	int64_t total_size = 0;
	397	NFSClient *client = g_malloc0(sizeof(NFSClient));
	398
471799d1 SH	399	client->aio_context = qemu_get_aio_context();
471799d1 SH	400
6542aa9c PL	401	/* Read out options */
	402	while (options && options->name) {
	403	if (!strcmp(options->name, "size")) {
	404	total_size = options->value.n;
	405	}
	406	options++;
	407	}
	408
	409	ret = nfs_client_open(client, url, O_CREAT, errp);
	410	if (ret < 0) {
	411	goto out;
	412	}
	413	ret = nfs_ftruncate(client->context, client->fh, total_size);
	414	nfs_client_close(client);
	415	out:
	416	g_free(client);
	417	return ret;
	418	}
	419
	420	static int nfs_has_zero_init(BlockDriverState *bs)
	421	{
	422	NFSClient *client = bs->opaque;
	423	return client->has_zero_init;
	424	}
	425
	426	static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
	427	{
	428	NFSClient *client = bs->opaque;
	429	NFSRPC task = {0};
	430	struct stat st;
	431
	432	task.st = &st;
	433	if (nfs_fstat_async(client->context, client->fh, nfs_co_generic_cb,
	434	&task) != 0) {
	435	return -ENOMEM;
	436	}
	437
	438	while (!task.complete) {
	439	nfs_set_events(client);
471799d1	440	aio_poll(client->aio_context, true);
6542aa9c PL	441	}
	442
	443	return (task.ret < 0 ? task.ret : st.st_blocks * st.st_blksize);
	444	}
	445
	446	static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
	447	{
	448	NFSClient *client = bs->opaque;
	449	return nfs_ftruncate(client->context, client->fh, offset);
	450	}
	451
	452	static BlockDriver bdrv_nfs = {
471799d1 SH	453	.format_name = "nfs",
	454	.protocol_name = "nfs",
	455
	456	.instance_size = sizeof(NFSClient),
	457	.bdrv_needs_filename = true,
	458	.bdrv_has_zero_init = nfs_has_zero_init,
	459	.bdrv_get_allocated_file_size = nfs_get_allocated_file_size,
	460	.bdrv_truncate = nfs_file_truncate,
	461
	462	.bdrv_file_open = nfs_file_open,
	463	.bdrv_close = nfs_file_close,
	464	.bdrv_create = nfs_file_create,
	465
	466	.bdrv_co_readv = nfs_co_readv,
	467	.bdrv_co_writev = nfs_co_writev,
	468	.bdrv_co_flush_to_disk = nfs_co_flush,
	469
	470	.bdrv_detach_aio_context = nfs_detach_aio_context,
	471	.bdrv_attach_aio_context = nfs_attach_aio_context,
6542aa9c PL	472	};
	473
	474	static void nfs_block_init(void)
	475	{
	476	bdrv_register(&bdrv_nfs);
	477	}
	478
	479	block_init(nfs_block_init);