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qemu/block/nfs.c

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/*
* QEMU Block driver for native access to files on NFS shares
*
* Copyright (c) 2014-2016 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 "qemu/osdep.h"
#include <poll.h>
#include "qemu-common.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "block/block_int.h"
#include "trace.h"
#include "qemu/iov.h"
#include "qemu/uri.h"
#include "qemu/cutils.h"
#include "sysemu/sysemu.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qint.h"
#include "qapi/qmp/qstring.h"
#include "qapi-visit.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/qobject-output-visitor.h"
#include <nfsc/libnfs.h>
#define QEMU_NFS_MAX_READAHEAD_SIZE 1048576
#define QEMU_NFS_MAX_PAGECACHE_SIZE (8388608 / NFS_BLKSIZE)
#define QEMU_NFS_MAX_DEBUG_LEVEL 2
typedef struct NFSClient {
struct nfs_context *context;
struct nfsfh *fh;
int events;
bool has_zero_init;
AioContext *aio_context;
blkcnt_t st_blocks;
bool cache_used;
NFSServer *server;
char *path;
int64_t uid, gid, tcp_syncnt, readahead, pagecache, debug;
} NFSClient;
typedef struct NFSRPC {
BlockDriverState *bs;
int ret;
int complete;
QEMUIOVector *iov;
struct stat *st;
Coroutine *co;
NFSClient *client;
} NFSRPC;
static int nfs_parse_uri(const char *filename, QDict *options, Error **errp)
{
URI *uri = NULL;
QueryParams *qp = NULL;
int ret = -EINVAL, i;
uri = uri_parse(filename);
if (!uri) {
error_setg(errp, "Invalid URI specified");
goto out;
}
if (strcmp(uri->scheme, "nfs") != 0) {
error_setg(errp, "URI scheme must be 'nfs'");
goto out;
}
if (!uri->server) {
error_setg(errp, "missing hostname in URI");
goto out;
}
if (!uri->path) {
error_setg(errp, "missing file path in URI");
goto out;
}
qp = query_params_parse(uri->query);
if (!qp) {
error_setg(errp, "could not parse query parameters");
goto out;
}
qdict_put(options, "server.host", qstring_from_str(uri->server));
qdict_put(options, "server.type", qstring_from_str("inet"));
qdict_put(options, "path", qstring_from_str(uri->path));
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 out;
}
if (parse_uint_full(qp->p[i].value, NULL, 0)) {
error_setg(errp, "Illegal value for NFS parameter: %s",
qp->p[i].name);
goto out;
}
if (!strcmp(qp->p[i].name, "uid")) {
qdict_put(options, "user",
qstring_from_str(qp->p[i].value));
} else if (!strcmp(qp->p[i].name, "gid")) {
qdict_put(options, "group",
qstring_from_str(qp->p[i].value));
} else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
qdict_put(options, "tcp-syn-count",
qstring_from_str(qp->p[i].value));
} else if (!strcmp(qp->p[i].name, "readahead")) {
qdict_put(options, "readahead-size",
qstring_from_str(qp->p[i].value));
} else if (!strcmp(qp->p[i].name, "pagecache")) {
qdict_put(options, "page-cache-size",
qstring_from_str(qp->p[i].value));
} else if (!strcmp(qp->p[i].name, "debug")) {
qdict_put(options, "debug",
qstring_from_str(qp->p[i].value));
} else {
error_setg(errp, "Unknown NFS parameter name: %s",
qp->p[i].name);
goto out;
}
}
ret = 0;
out:
if (qp) {
query_params_free(qp);
}
if (uri) {
uri_free(uri);
}
return ret;
}
static bool nfs_has_filename_options_conflict(QDict *options, Error **errp)
{
const QDictEntry *qe;
for (qe = qdict_first(options); qe; qe = qdict_next(options, qe)) {
if (!strcmp(qe->key, "host") ||
!strcmp(qe->key, "path") ||
!strcmp(qe->key, "user") ||
!strcmp(qe->key, "group") ||
!strcmp(qe->key, "tcp-syn-count") ||
!strcmp(qe->key, "readahead-size") ||
!strcmp(qe->key, "page-cache-size") ||
!strcmp(qe->key, "debug") ||
strstart(qe->key, "server.", NULL))
{
error_setg(errp, "Option %s cannot be used with a filename",
qe->key);
return true;
}
}
return false;
}
static void nfs_parse_filename(const char *filename, QDict *options,
Error **errp)
{
if (nfs_has_filename_options_conflict(options, errp)) {
return;
}
nfs_parse_uri(filename, options, errp);
}
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),
false,
(ev & POLLIN) ? nfs_process_read : NULL,
(ev & POLLOUT) ? nfs_process_write : NULL,
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(BlockDriverState *bs, NFSRPC *task)
{
*task = (NFSRPC) {
.co = qemu_coroutine_self(),
.bs = bs,
.client = bs->opaque,
};
}
static void nfs_co_generic_bh_cb(void *opaque)
{
NFSRPC *task = opaque;
task->complete = 1;
qemu_coroutine_enter(task->co);
}
static void
nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data,
void *private_data)
{
NFSRPC *task = private_data;
task->ret = ret;
assert(!task->st);
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) {
error_report("NFS Error: %s", nfs_get_error(nfs));
}
aio_bh_schedule_oneshot(task->client->aio_context,
nfs_co_generic_bh_cb, task);
}
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(bs, &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;
}
nfs_set_events(client);
while (!task.complete) {
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(bs, &task);
buf = g_try_malloc(nb_sectors * BDRV_SECTOR_SIZE);
if (nb_sectors && buf == NULL) {
return -ENOMEM;
}
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;
}
nfs_set_events(client);
while (!task.complete) {
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(bs, &task);
if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
&task) != 0) {
return -ENOMEM;
}
nfs_set_events(client);
while (!task.complete) {
qemu_coroutine_yield();
}
return task.ret;
}
static QemuOptsList runtime_opts = {
.name = "nfs",
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
.desc = {
{
.name = "path",
.type = QEMU_OPT_STRING,
.help = "Path of the image on the host",
},
{
.name = "uid",
.type = QEMU_OPT_NUMBER,
.help = "UID value to use when talking to the server",
},
{
.name = "gid",
.type = QEMU_OPT_NUMBER,
.help = "GID value to use when talking to the server",
},
{
.name = "tcp-syncnt",
.type = QEMU_OPT_NUMBER,
.help = "Number of SYNs to send during the session establish",
},
{
.name = "readahead",
.type = QEMU_OPT_NUMBER,
.help = "Set the readahead size in bytes",
},
{
.name = "pagecache",
.type = QEMU_OPT_NUMBER,
.help = "Set the pagecache size in bytes",
},
{
.name = "debug",
.type = QEMU_OPT_NUMBER,
.help = "Set the NFS debug level (max 2)",
},
{ /* 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),
false, NULL, 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),
false, NULL, 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 NFSServer *nfs_config(QDict *options, Error **errp)
{
NFSServer *server = NULL;
QDict *addr = NULL;
QObject *crumpled_addr = NULL;
Visitor *iv = NULL;
Error *local_error = NULL;
qdict_extract_subqdict(options, &addr, "server.");
if (!qdict_size(addr)) {
error_setg(errp, "NFS server address missing");
goto out;
}
crumpled_addr = qdict_crumple(addr, errp);
if (!crumpled_addr) {
goto out;
}
iv = qobject_input_visitor_new(crumpled_addr, true);
visit_type_NFSServer(iv, NULL, &server, &local_error);
if (local_error) {
error_propagate(errp, local_error);
goto out;
}
out:
QDECREF(addr);
qobject_decref(crumpled_addr);
visit_free(iv);
return server;
}
static int64_t nfs_client_open(NFSClient *client, QDict *options,
int flags, Error **errp, int open_flags)
{
int ret = -EINVAL;
QemuOpts *opts = NULL;
Error *local_err = NULL;
struct stat st;
char *file = NULL, *strp = NULL;
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);
ret = -EINVAL;
goto fail;
}
client->path = g_strdup(qemu_opt_get(opts, "path"));
if (!client->path) {
ret = -EINVAL;
error_setg(errp, "No path was specified");
goto fail;
}
strp = strrchr(client->path, '/');
if (strp == NULL) {
error_setg(errp, "Invalid URL specified");
goto fail;
}
file = g_strdup(strp);
*strp = 0;
/* Pop the config into our state object, Exit if invalid */
client->server = nfs_config(options, errp);
if (!client->server) {
ret = -EINVAL;
goto fail;
}
client->context = nfs_init_context();
if (client->context == NULL) {
error_setg(errp, "Failed to init NFS context");
goto fail;
}
if (qemu_opt_get(opts, "uid")) {
client->uid = qemu_opt_get_number(opts, "uid", 0);
nfs_set_uid(client->context, client->uid);
}
if (qemu_opt_get(opts, "gid")) {
client->gid = qemu_opt_get_number(opts, "gid", 0);
nfs_set_gid(client->context, client->gid);
}
if (qemu_opt_get(opts, "tcp-syncnt")) {
client->tcp_syncnt = qemu_opt_get_number(opts, "tcp-syncnt", 0);
nfs_set_tcp_syncnt(client->context, client->tcp_syncnt);
}
#ifdef LIBNFS_FEATURE_READAHEAD
if (qemu_opt_get(opts, "readahead")) {
if (open_flags & BDRV_O_NOCACHE) {
error_setg(errp, "Cannot enable NFS readahead "
"if cache.direct = on");
goto fail;
}
client->readahead = qemu_opt_get_number(opts, "readahead", 0);
if (client->readahead > QEMU_NFS_MAX_READAHEAD_SIZE) {
error_report("NFS Warning: Truncating NFS readahead "
"size to %d", QEMU_NFS_MAX_READAHEAD_SIZE);
client->readahead = QEMU_NFS_MAX_READAHEAD_SIZE;
}
nfs_set_readahead(client->context, client->readahead);
#ifdef LIBNFS_FEATURE_PAGECACHE
nfs_set_pagecache_ttl(client->context, 0);
#endif
client->cache_used = true;
}
#endif
#ifdef LIBNFS_FEATURE_PAGECACHE
if (qemu_opt_get(opts, "pagecache")) {
if (open_flags & BDRV_O_NOCACHE) {
error_setg(errp, "Cannot enable NFS pagecache "
"if cache.direct = on");
goto fail;
}
client->pagecache = qemu_opt_get_number(opts, "pagecache", 0);
if (client->pagecache > QEMU_NFS_MAX_PAGECACHE_SIZE) {
error_report("NFS Warning: Truncating NFS pagecache "
"size to %d pages", QEMU_NFS_MAX_PAGECACHE_SIZE);
client->pagecache = QEMU_NFS_MAX_PAGECACHE_SIZE;
}
nfs_set_pagecache(client->context, client->pagecache);
nfs_set_pagecache_ttl(client->context, 0);
client->cache_used = true;
}
#endif
#ifdef LIBNFS_FEATURE_DEBUG
if (qemu_opt_get(opts, "debug")) {
client->debug = qemu_opt_get_number(opts, "debug", 0);
/* limit the maximum debug level to avoid potential flooding
* of our log files. */
if (client->debug > QEMU_NFS_MAX_DEBUG_LEVEL) {
error_report("NFS Warning: Limiting NFS debug level "
"to %d", QEMU_NFS_MAX_DEBUG_LEVEL);
client->debug = QEMU_NFS_MAX_DEBUG_LEVEL;
}
nfs_set_debug(client->context, client->debug);
}
#endif
ret = nfs_mount(client->context, client->server->host, client->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->st_blocks = st.st_blocks;
client->has_zero_init = S_ISREG(st.st_mode);
*strp = '/';
goto out;
fail:
nfs_client_close(client);
out:
qemu_opts_del(opts);
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;
client->aio_context = bdrv_get_aio_context(bs);
ret = nfs_client_open(client, options,
(flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
errp, bs->open_flags);
if (ret < 0) {
return ret;
}
bs->total_sectors = ret;
ret = 0;
return ret;
}
static QemuOptsList nfs_create_opts = {
.name = "nfs-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(nfs_create_opts.head),
.desc = {
{
.name = BLOCK_OPT_SIZE,
.type = QEMU_OPT_SIZE,
.help = "Virtual disk size"
},
{ /* end of list */ }
}
};
static int nfs_file_create(const char *url, QemuOpts *opts, Error **errp)
{
int ret = 0;
int64_t total_size = 0;
NFSClient *client = g_new0(NFSClient, 1);
QDict *options = NULL;
client->aio_context = qemu_get_aio_context();
/* Read out options */
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
options = qdict_new();
ret = nfs_parse_uri(url, options, errp);
if (ret < 0) {
goto out;
}
ret = nfs_client_open(client, options, O_CREAT, errp, 0);
if (ret < 0) {
goto out;
}
ret = nfs_ftruncate(client->context, client->fh, total_size);
nfs_client_close(client);
out:
QDECREF(options);
g_free(client);
return ret;
}
static int nfs_has_zero_init(BlockDriverState *bs)
{
NFSClient *client = bs->opaque;
return client->has_zero_init;
}
static void
nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data,
void *private_data)
{
NFSRPC *task = private_data;
task->ret = ret;
if (task->ret == 0) {
memcpy(task->st, data, sizeof(struct stat));
}
if (task->ret < 0) {
error_report("NFS Error: %s", nfs_get_error(nfs));
}
task->complete = 1;
bdrv_wakeup(task->bs);
}
static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
{
NFSClient *client = bs->opaque;
NFSRPC task = {0};
struct stat st;
if (bdrv_is_read_only(bs) &&
!(bs->open_flags & BDRV_O_NOCACHE)) {
return client->st_blocks * 512;
}
task.bs = bs;
task.st = &st;
if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb,
&task) != 0) {
return -ENOMEM;
}
nfs_set_events(client);
BDRV_POLL_WHILE(bs, !task.complete);
return (task.ret < 0 ? task.ret : st.st_blocks * 512);
}
static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
{
NFSClient *client = bs->opaque;
return nfs_ftruncate(client->context, client->fh, offset);
}
/* Note that this will not re-establish a connection with the NFS server
* - it is effectively a NOP. */
static int nfs_reopen_prepare(BDRVReopenState *state,
BlockReopenQueue *queue, Error **errp)
{
NFSClient *client = state->bs->opaque;
struct stat st;
int ret = 0;
if (state->flags & BDRV_O_RDWR && bdrv_is_read_only(state->bs)) {
error_setg(errp, "Cannot open a read-only mount as read-write");
return -EACCES;
}
if ((state->flags & BDRV_O_NOCACHE) && client->cache_used) {
error_setg(errp, "Cannot disable cache if libnfs readahead or"
" pagecache is enabled");
return -EINVAL;
}
/* Update cache for read-only reopens */
if (!(state->flags & BDRV_O_RDWR)) {
ret = nfs_fstat(client->context, client->fh, &st);
if (ret < 0) {
error_setg(errp, "Failed to fstat file: %s",
nfs_get_error(client->context));
return ret;
}
client->st_blocks = st.st_blocks;
}
return 0;
}
static void nfs_refresh_filename(BlockDriverState *bs, QDict *options)
{
NFSClient *client = bs->opaque;
QDict *opts = qdict_new();
QObject *server_qdict;
Visitor *ov;
qdict_put(opts, "driver", qstring_from_str("nfs"));
if (client->uid && !client->gid) {
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"nfs://%s%s?uid=%" PRId64, client->server->host, client->path,
client->uid);
} else if (!client->uid && client->gid) {
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"nfs://%s%s?gid=%" PRId64, client->server->host, client->path,
client->gid);
} else if (client->uid && client->gid) {
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"nfs://%s%s?uid=%" PRId64 "&gid=%" PRId64,
client->server->host, client->path, client->uid, client->gid);
} else {
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"nfs://%s%s", client->server->host, client->path);
}
ov = qobject_output_visitor_new(&server_qdict);
visit_type_NFSServer(ov, NULL, &client->server, &error_abort);
visit_complete(ov, &server_qdict);
assert(qobject_type(server_qdict) == QTYPE_QDICT);
qdict_put_obj(opts, "server", server_qdict);
qdict_put(opts, "path", qstring_from_str(client->path));
if (client->uid) {
qdict_put(opts, "uid", qint_from_int(client->uid));
}
if (client->gid) {
qdict_put(opts, "gid", qint_from_int(client->gid));
}
if (client->tcp_syncnt) {
qdict_put(opts, "tcp-syncnt",
qint_from_int(client->tcp_syncnt));
}
if (client->readahead) {
qdict_put(opts, "readahead",
qint_from_int(client->readahead));
}
if (client->pagecache) {
qdict_put(opts, "pagecache",
qint_from_int(client->pagecache));
}
if (client->debug) {
qdict_put(opts, "debug", qint_from_int(client->debug));
}
visit_free(ov);
qdict_flatten(opts);
bs->full_open_options = opts;
}
#ifdef LIBNFS_FEATURE_PAGECACHE
static void nfs_invalidate_cache(BlockDriverState *bs,
Error **errp)
{
NFSClient *client = bs->opaque;
nfs_pagecache_invalidate(client->context, client->fh);
}
#endif
static BlockDriver bdrv_nfs = {
.format_name = "nfs",
.protocol_name = "nfs",
.instance_size = sizeof(NFSClient),
.bdrv_parse_filename = nfs_parse_filename,
.create_opts = &nfs_create_opts,
.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_reopen_prepare = nfs_reopen_prepare,
.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,
.bdrv_refresh_filename = nfs_refresh_filename,
#ifdef LIBNFS_FEATURE_PAGECACHE
.bdrv_invalidate_cache = nfs_invalidate_cache,
#endif
};
static void nfs_block_init(void)
{
bdrv_register(&bdrv_nfs);
}
block_init(nfs_block_init);
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