[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;
    task->complete = 1;
    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->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);
    } else {
        task->complete = 1;
    }
}

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;
a2c0fe2f	98	task->complete = 1;
6542aa9c PL	99	qemu_bh_delete(task->bh);
	100	qemu_coroutine_enter(task->co, NULL);
	101	}
	102
	103	static void
	104	nfs_co_generic_cb(int ret, struct nfs_context nfs, void data,
	105	void *private_data)
	106	{
	107	NFSRPC *task = private_data;
6542aa9c PL	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	125	qemu_bh_schedule(task->bh);
a2c0fe2f PL	126	} else {
a2c0fe2f PL	127	task->complete = 1;
6542aa9c PL	128	}
	129	}
	130
	131	static int coroutine_fn nfs_co_readv(BlockDriverState *bs,
	132	int64_t sector_num, int nb_sectors,
	133	QEMUIOVector *iov)
	134	{
	135	NFSClient *client = bs->opaque;
	136	NFSRPC task;
	137
	138	nfs_co_init_task(client, &task);
	139	task.iov = iov;
	140
	141	if (nfs_pread_async(client->context, client->fh,
	142	sector_num * BDRV_SECTOR_SIZE,
	143	nb_sectors * BDRV_SECTOR_SIZE,
	144	nfs_co_generic_cb, &task) != 0) {
	145	return -ENOMEM;
	146	}
	147
	148	while (!task.complete) {
	149	nfs_set_events(client);
	150	qemu_coroutine_yield();
	151	}
	152
	153	if (task.ret < 0) {
	154	return task.ret;
	155	}
	156
	157	/* zero pad short reads */
	158	if (task.ret < iov->size) {
	159	qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret);
	160	}
	161
	162	return 0;
	163	}
	164
	165	static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
	166	int64_t sector_num, int nb_sectors,
	167	QEMUIOVector *iov)
	168	{
	169	NFSClient *client = bs->opaque;
	170	NFSRPC task;
	171	char *buf = NULL;
	172
	173	nfs_co_init_task(client, &task);
	174
	175	buf = g_malloc(nb_sectors * BDRV_SECTOR_SIZE);
	176	qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
	177
	178	if (nfs_pwrite_async(client->context, client->fh,
	179	sector_num * BDRV_SECTOR_SIZE,
	180	nb_sectors * BDRV_SECTOR_SIZE,
	181	buf, nfs_co_generic_cb, &task) != 0) {
	182	g_free(buf);
	183	return -ENOMEM;
	184	}
	185
	186	while (!task.complete) {
	187	nfs_set_events(client);
	188	qemu_coroutine_yield();
	189	}
	190
	191	g_free(buf);
192
193	if (task.ret != nb_sectors * BDRV_SECTOR_SIZE) {
194	return task.ret < 0 ? task.ret : -EIO;
195	}
196
197	return 0;
198	}
199
200	static int coroutine_fn nfs_co_flush(BlockDriverState *bs)
201	{
202	NFSClient *client = bs->opaque;
203	NFSRPC task;
204
205	nfs_co_init_task(client, &task);
206
207	if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
208	&task) != 0) {
209	return -ENOMEM;
210	}
211
212	while (!task.complete) {
213	nfs_set_events(client);
214	qemu_coroutine_yield();
215	}
216
217	return task.ret;
218	}
219
220	/* TODO Convert to fine grained options */
221	static QemuOptsList runtime_opts = {
222	.name = "nfs",
223	.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
224	.desc = {
225	{
226	.name = "filename",
227	.type = QEMU_OPT_STRING,
228	.help = "URL to the NFS file",
229	},
230	{ /* end of list */ }
231	},
232	};
233
471799d1 SH	234	static void nfs_detach_aio_context(BlockDriverState *bs)
	235	{
	236	NFSClient *client = bs->opaque;
	237
	238	aio_set_fd_handler(client->aio_context,
	239	nfs_get_fd(client->context),
	240	NULL, NULL, NULL);
	241	client->events = 0;
	242	}
	243
	244	static void nfs_attach_aio_context(BlockDriverState *bs,
	245	AioContext *new_context)
	246	{
	247	NFSClient *client = bs->opaque;
	248
	249	client->aio_context = new_context;
	250	nfs_set_events(client);
	251	}
	252
6542aa9c PL	253	static void nfs_client_close(NFSClient *client)
	254	{
	255	if (client->context) {
	256	if (client->fh) {
	257	nfs_close(client->context, client->fh);
	258	}
471799d1 SH	259	aio_set_fd_handler(client->aio_context,
	260	nfs_get_fd(client->context),
	261	NULL, NULL, NULL);
6542aa9c PL	262	nfs_destroy_context(client->context);
	263	}
	264	memset(client, 0, sizeof(NFSClient));
	265	}
	266
	267	static void nfs_file_close(BlockDriverState *bs)
	268	{
	269	NFSClient *client = bs->opaque;
	270	nfs_client_close(client);
	271	}
	272
	273	static int64_t nfs_client_open(NFSClient client, const char filename,
	274	int flags, Error **errp)
	275	{
	276	int ret = -EINVAL, i;
	277	struct stat st;
	278	URI *uri;
	279	QueryParams *qp = NULL;
	280	char file = NULL, strp = NULL;
	281
	282	uri = uri_parse(filename);
	283	if (!uri) {
	284	error_setg(errp, "Invalid URL specified");
5f4d5e1a HR	285	goto fail;
	286	}
	287	if (!uri->server) {
	288	error_setg(errp, "Invalid URL specified");
6542aa9c PL	289	goto fail;
	290	}
	291	strp = strrchr(uri->path, '/');
	292	if (strp == NULL) {
	293	error_setg(errp, "Invalid URL specified");
	294	goto fail;
	295	}
	296	file = g_strdup(strp);
	297	*strp = 0;
	298
	299	client->context = nfs_init_context();
	300	if (client->context == NULL) {
	301	error_setg(errp, "Failed to init NFS context");
	302	goto fail;
	303	}
	304
	305	qp = query_params_parse(uri->query);
	306	for (i = 0; i < qp->n; i++) {
	307	if (!qp->p[i].value) {
	308	error_setg(errp, "Value for NFS parameter expected: %s",
	309	qp->p[i].name);
	310	goto fail;
	311	}
	312	if (!strncmp(qp->p[i].name, "uid", 3)) {
	313	nfs_set_uid(client->context, atoi(qp->p[i].value));
	314	} else if (!strncmp(qp->p[i].name, "gid", 3)) {
	315	nfs_set_gid(client->context, atoi(qp->p[i].value));
	316	} else if (!strncmp(qp->p[i].name, "tcp-syncnt", 10)) {
	317	nfs_set_tcp_syncnt(client->context, atoi(qp->p[i].value));
	318	} else {
	319	error_setg(errp, "Unknown NFS parameter name: %s",
	320	qp->p[i].name);
	321	goto fail;
	322	}
	323	}
	324
	325	ret = nfs_mount(client->context, uri->server, uri->path);
	326	if (ret < 0) {
	327	error_setg(errp, "Failed to mount nfs share: %s",
	328	nfs_get_error(client->context));
	329	goto fail;
	330	}
	331
	332	if (flags & O_CREAT) {
	333	ret = nfs_creat(client->context, file, 0600, &client->fh);
	334	if (ret < 0) {
	335	error_setg(errp, "Failed to create file: %s",
	336	nfs_get_error(client->context));
	337	goto fail;
	338	}
	339	} else {
	340	ret = nfs_open(client->context, file, flags, &client->fh);
	341	if (ret < 0) {
	342	error_setg(errp, "Failed to open file : %s",
	343	nfs_get_error(client->context));
	344	goto fail;
	345	}
	346	}
	347
	348	ret = nfs_fstat(client->context, client->fh, &st);
	349	if (ret < 0) {
	350	error_setg(errp, "Failed to fstat file: %s",
	351	nfs_get_error(client->context));
	352	goto fail;
353	}
354
355	ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
356	client->has_zero_init = S_ISREG(st.st_mode);
357	goto out;
358	fail:
359	nfs_client_close(client);
360	out:
361	if (qp) {
362	query_params_free(qp);
363	}
364	uri_free(uri);
365	g_free(file);
366	return ret;
367	}
368
369	static int nfs_file_open(BlockDriverState bs, QDict options, int flags,
370	Error **errp) {
371	NFSClient *client = bs->opaque;
372	int64_t ret;
373	QemuOpts *opts;
374	Error *local_err = NULL;
375
471799d1 SH	376	client->aio_context = bdrv_get_aio_context(bs);
471799d1 SH	377
6542aa9c PL	378	opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
6542aa9c PL	379	qemu_opts_absorb_qdict(opts, options, &local_err);
0fb6395c	380	if (local_err) {
6542aa9c PL	381	error_propagate(errp, local_err);
	382	return -EINVAL;
	383	}
	384	ret = nfs_client_open(client, qemu_opt_get(opts, "filename"),
	385	(flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
	386	errp);
	387	if (ret < 0) {
	388	return ret;
	389	}
	390	bs->total_sectors = ret;
	391	return 0;
	392	}
	393
	394	static int nfs_file_create(const char url, QEMUOptionParameter options,
	395	Error **errp)
	396	{
	397	int ret = 0;
	398	int64_t total_size = 0;
	399	NFSClient *client = g_malloc0(sizeof(NFSClient));
	400
471799d1 SH	401	client->aio_context = qemu_get_aio_context();
471799d1 SH	402
6542aa9c PL	403	/* Read out options */
	404	while (options && options->name) {
	405	if (!strcmp(options->name, "size")) {
	406	total_size = options->value.n;
	407	}
	408	options++;
	409	}
	410
	411	ret = nfs_client_open(client, url, O_CREAT, errp);
	412	if (ret < 0) {
	413	goto out;
	414	}
	415	ret = nfs_ftruncate(client->context, client->fh, total_size);
	416	nfs_client_close(client);
	417	out:
	418	g_free(client);
	419	return ret;
	420	}
	421
	422	static int nfs_has_zero_init(BlockDriverState *bs)
	423	{
	424	NFSClient *client = bs->opaque;
	425	return client->has_zero_init;
	426	}
	427
	428	static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
	429	{
	430	NFSClient *client = bs->opaque;
	431	NFSRPC task = {0};
	432	struct stat st;
	433
	434	task.st = &st;
	435	if (nfs_fstat_async(client->context, client->fh, nfs_co_generic_cb,
	436	&task) != 0) {
	437	return -ENOMEM;
	438	}
	439
	440	while (!task.complete) {
	441	nfs_set_events(client);
471799d1	442	aio_poll(client->aio_context, true);
6542aa9c PL	443	}
	444
	445	return (task.ret < 0 ? task.ret : st.st_blocks * st.st_blksize);
	446	}
	447
	448	static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
	449	{
	450	NFSClient *client = bs->opaque;
	451	return nfs_ftruncate(client->context, client->fh, offset);
	452	}
	453
	454	static BlockDriver bdrv_nfs = {
471799d1 SH	455	.format_name = "nfs",
	456	.protocol_name = "nfs",
	457
	458	.instance_size = sizeof(NFSClient),
	459	.bdrv_needs_filename = true,
	460	.bdrv_has_zero_init = nfs_has_zero_init,
	461	.bdrv_get_allocated_file_size = nfs_get_allocated_file_size,
	462	.bdrv_truncate = nfs_file_truncate,
	463
	464	.bdrv_file_open = nfs_file_open,
	465	.bdrv_close = nfs_file_close,
	466	.bdrv_create = nfs_file_create,
	467
	468	.bdrv_co_readv = nfs_co_readv,
	469	.bdrv_co_writev = nfs_co_writev,
	470	.bdrv_co_flush_to_disk = nfs_co_flush,
	471
	472	.bdrv_detach_aio_context = nfs_detach_aio_context,
	473	.bdrv_attach_aio_context = nfs_attach_aio_context,
6542aa9c PL	474	};
	475
	476	static void nfs_block_init(void)
	477	{
	478	bdrv_register(&bdrv_nfs);
	479	}
	480
	481	block_init(nfs_block_init);