On Thu, Sep 03, 2020 at 03:43:07PM +0800, Yonggang Luo wrote:
> Signed-off-by: Yonggang Luo <luoyongg...@gmail.com>
> ---
> block/nfs.c | 1812 ++++++++++++++++++++++++++-------------------------
> 1 file changed, 910 insertions(+), 902 deletions(-)
The diff for this file is totally messed up, adding/removing every
single line. I presume you've change line endings to DOS style,
so please revert that.
>
> diff --git a/block/nfs.c b/block/nfs.c
> index 61a249a9fc..34b2cd5708 100644
> --- a/block/nfs.c
> +++ b/block/nfs.c
> @@ -1,902 +1,910 @@
> -/*
> - * QEMU Block driver for native access to files on NFS shares
> - *
> - * Copyright (c) 2014-2017 Peter Lieven <p...@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/config-file.h"
> -#include "qemu/error-report.h"
> -#include "qapi/error.h"
> -#include "block/block_int.h"
> -#include "block/qdict.h"
> -#include "trace.h"
> -#include "qemu/iov.h"
> -#include "qemu/main-loop.h"
> -#include "qemu/module.h"
> -#include "qemu/option.h"
> -#include "qemu/uri.h"
> -#include "qemu/cutils.h"
> -#include "sysemu/sysemu.h"
> -#include "sysemu/replay.h"
> -#include "qapi/qapi-visit-block-core.h"
> -#include "qapi/qmp/qdict.h"
> -#include "qapi/qmp/qstring.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;
> - QemuMutex mutex;
> - 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 (g_strcmp0(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_str(options, "server.host", uri->server);
> - qdict_put_str(options, "server.type", "inet");
> - qdict_put_str(options, "path", uri->path);
> -
> - for (i = 0; i < qp->n; i++) {
> - unsigned long long val;
> - 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, &val, 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_str(options, "user", qp->p[i].value);
> - } else if (!strcmp(qp->p[i].name, "gid")) {
> - qdict_put_str(options, "group", qp->p[i].value);
> - } else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
> - qdict_put_str(options, "tcp-syn-count", qp->p[i].value);
> - } else if (!strcmp(qp->p[i].name, "readahead")) {
> - qdict_put_str(options, "readahead-size", qp->p[i].value);
> - } else if (!strcmp(qp->p[i].name, "pagecache")) {
> - qdict_put_str(options, "page-cache-size", qp->p[i].value);
> - } else if (!strcmp(qp->p[i].name, "debug")) {
> - qdict_put_str(options, "debug", 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);
> -
> -/* Called with QemuMutex held. */
> -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;
> -
> - qemu_mutex_lock(&client->mutex);
> - nfs_service(client->context, POLLIN);
> - nfs_set_events(client);
> - qemu_mutex_unlock(&client->mutex);
> -}
> -
> -static void nfs_process_write(void *arg)
> -{
> - NFSClient *client = arg;
> -
> - qemu_mutex_lock(&client->mutex);
> - nfs_service(client->context, POLLOUT);
> - nfs_set_events(client);
> - qemu_mutex_unlock(&client->mutex);
> -}
> -
> -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;
> - aio_co_wake(task->co);
> -}
> -
> -/* Called (via nfs_service) with QemuMutex held. */
> -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));
> - }
> - replay_bh_schedule_oneshot_event(task->client->aio_context,
> - nfs_co_generic_bh_cb, task);
> -}
> -
> -static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, uint64_t offset,
> - uint64_t bytes, QEMUIOVector *iov,
> - int flags)
> -{
> - NFSClient *client = bs->opaque;
> - NFSRPC task;
> -
> - nfs_co_init_task(bs, &task);
> - task.iov = iov;
> -
> - WITH_QEMU_LOCK_GUARD(&client->mutex) {
> - if (nfs_pread_async(client->context, client->fh,
> - offset, bytes, 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_pwritev(BlockDriverState *bs, uint64_t offset,
> - uint64_t bytes, QEMUIOVector *iov,
> - int flags)
> -{
> - NFSClient *client = bs->opaque;
> - NFSRPC task;
> - char *buf = NULL;
> - bool my_buffer = false;
> -
> - nfs_co_init_task(bs, &task);
> -
> - if (iov->niov != 1) {
> - buf = g_try_malloc(bytes);
> - if (bytes && buf == NULL) {
> - return -ENOMEM;
> - }
> - qemu_iovec_to_buf(iov, 0, buf, bytes);
> - my_buffer = true;
> - } else {
> - buf = iov->iov[0].iov_base;
> - }
> -
> - WITH_QEMU_LOCK_GUARD(&client->mutex) {
> - if (nfs_pwrite_async(client->context, client->fh,
> - offset, bytes, buf,
> - nfs_co_generic_cb, &task) != 0) {
> - if (my_buffer) {
> - g_free(buf);
> - }
> - return -ENOMEM;
> - }
> -
> - nfs_set_events(client);
> - }
> - while (!task.complete) {
> - qemu_coroutine_yield();
> - }
> -
> - if (my_buffer) {
> - g_free(buf);
> - }
> -
> - if (task.ret != bytes) {
> - 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);
> -
> - WITH_QEMU_LOCK_GUARD(&client->mutex) {
> - 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 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) {
> - qemu_mutex_lock(&client->mutex);
> - aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
> - false, NULL, NULL, NULL, NULL);
> - qemu_mutex_unlock(&client->mutex);
> - if (client->fh) {
> - nfs_close(client->context, client->fh);
> - client->fh = NULL;
> - }
> -#ifdef LIBNFS_FEATURE_UMOUNT
> - nfs_umount(client->context);
> -#endif
> - nfs_destroy_context(client->context);
> - client->context = NULL;
> - }
> - g_free(client->path);
> - qemu_mutex_destroy(&client->mutex);
> - qapi_free_NFSServer(client->server);
> - client->server = NULL;
> -}
> -
> -static void nfs_file_close(BlockDriverState *bs)
> -{
> - NFSClient *client = bs->opaque;
> - nfs_client_close(client);
> -}
> -
> -static int64_t nfs_client_open(NFSClient *client, BlockdevOptionsNfs *opts,
> - int flags, int open_flags, Error **errp)
> -{
> - int64_t ret = -EINVAL;
> - struct stat st;
> - char *file = NULL, *strp = NULL;
> -
> - qemu_mutex_init(&client->mutex);
> -
> - client->path = g_strdup(opts->path);
> -
> - strp = strrchr(client->path, '/');
> - if (strp == NULL) {
> - error_setg(errp, "Invalid URL specified");
> - goto fail;
> - }
> - file = g_strdup(strp);
> - *strp = 0;
> -
> - /* Steal the NFSServer object from opts; set the original pointer to NULL
> - * to avoid use after free and double free. */
> - client->server = opts->server;
> - opts->server = NULL;
> -
> - client->context = nfs_init_context();
> - if (client->context == NULL) {
> - error_setg(errp, "Failed to init NFS context");
> - goto fail;
> - }
> -
> - if (opts->has_user) {
> - client->uid = opts->user;
> - nfs_set_uid(client->context, client->uid);
> - }
> -
> - if (opts->has_group) {
> - client->gid = opts->group;
> - nfs_set_gid(client->context, client->gid);
> - }
> -
> - if (opts->has_tcp_syn_count) {
> - client->tcp_syncnt = opts->tcp_syn_count;
> - nfs_set_tcp_syncnt(client->context, client->tcp_syncnt);
> - }
> -
> -#ifdef LIBNFS_FEATURE_READAHEAD
> - if (opts->has_readahead_size) {
> - if (open_flags & BDRV_O_NOCACHE) {
> - error_setg(errp, "Cannot enable NFS readahead "
> - "if cache.direct = on");
> - goto fail;
> - }
> - client->readahead = opts->readahead_size;
> - if (client->readahead > QEMU_NFS_MAX_READAHEAD_SIZE) {
> - warn_report("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 (opts->has_page_cache_size) {
> - if (open_flags & BDRV_O_NOCACHE) {
> - error_setg(errp, "Cannot enable NFS pagecache "
> - "if cache.direct = on");
> - goto fail;
> - }
> - client->pagecache = opts->page_cache_size;
> - if (client->pagecache > QEMU_NFS_MAX_PAGECACHE_SIZE) {
> - warn_report("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 (opts->has_debug) {
> - client->debug = opts->debug;
> - /* limit the maximum debug level to avoid potential flooding
> - * of our log files. */
> - if (client->debug > QEMU_NFS_MAX_DEBUG_LEVEL) {
> - warn_report("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:
> - g_free(file);
> - return ret;
> -}
> -
> -static BlockdevOptionsNfs *nfs_options_qdict_to_qapi(QDict *options,
> - Error **errp)
> -{
> - BlockdevOptionsNfs *opts = NULL;
> - Visitor *v;
> - const QDictEntry *e;
> -
> - v = qobject_input_visitor_new_flat_confused(options, errp);
> - if (!v) {
> - return NULL;
> - }
> -
> - visit_type_BlockdevOptionsNfs(v, NULL, &opts, errp);
> - visit_free(v);
> - if (!opts) {
> - return NULL;
> - }
> -
> - /* Remove the processed options from the QDict (the visitor processes
> - * _all_ options in the QDict) */
> - while ((e = qdict_first(options))) {
> - qdict_del(options, e->key);
> - }
> -
> - return opts;
> -}
> -
> -static int64_t nfs_client_open_qdict(NFSClient *client, QDict *options,
> - int flags, int open_flags, Error **errp)
> -{
> - BlockdevOptionsNfs *opts;
> - int ret;
> -
> - opts = nfs_options_qdict_to_qapi(options, errp);
> - if (opts == NULL) {
> - ret = -EINVAL;
> - goto fail;
> - }
> -
> - ret = nfs_client_open(client, opts, flags, open_flags, errp);
> -fail:
> - qapi_free_BlockdevOptionsNfs(opts);
> - 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_qdict(client, options,
> - (flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
> - bs->open_flags, errp);
> - if (ret < 0) {
> - return ret;
> - }
> -
> - bs->total_sectors = ret;
> - if (client->has_zero_init) {
> - bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
> - }
> - return 0;
> -}
> -
> -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_co_create(BlockdevCreateOptions *options, Error **errp)
> -{
> - BlockdevCreateOptionsNfs *opts = &options->u.nfs;
> - NFSClient *client = g_new0(NFSClient, 1);
> - int ret;
> -
> - assert(options->driver == BLOCKDEV_DRIVER_NFS);
> -
> - client->aio_context = qemu_get_aio_context();
> -
> - ret = nfs_client_open(client, opts->location, O_CREAT, 0, errp);
> - if (ret < 0) {
> - goto out;
> - }
> - ret = nfs_ftruncate(client->context, client->fh, opts->size);
> - nfs_client_close(client);
> -
> -out:
> - g_free(client);
> - return ret;
> -}
> -
> -static int coroutine_fn nfs_file_co_create_opts(BlockDriver *drv,
> - const char *url,
> - QemuOpts *opts,
> - Error **errp)
> -{
> - BlockdevCreateOptions *create_options;
> - BlockdevCreateOptionsNfs *nfs_opts;
> - QDict *options;
> - int ret;
> -
> - create_options = g_new0(BlockdevCreateOptions, 1);
> - create_options->driver = BLOCKDEV_DRIVER_NFS;
> - nfs_opts = &create_options->u.nfs;
> -
> - /* Read out options */
> - nfs_opts->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;
> - }
> -
> - nfs_opts->location = nfs_options_qdict_to_qapi(options, errp);
> - if (nfs_opts->location == NULL) {
> - ret = -EINVAL;
> - goto out;
> - }
> -
> - ret = nfs_file_co_create(create_options, errp);
> - if (ret < 0) {
> - goto out;
> - }
> -
> - ret = 0;
> -out:
> - qobject_unref(options);
> - qapi_free_BlockdevCreateOptions(create_options);
> - return ret;
> -}
> -
> -static int nfs_has_zero_init(BlockDriverState *bs)
> -{
> - NFSClient *client = bs->opaque;
> - return client->has_zero_init;
> -}
> -
> -/* Called (via nfs_service) with QemuMutex held. */
> -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));
> - }
> -
> - /* Set task->complete before reading bs->wakeup. */
> - atomic_mb_set(&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 coroutine_fn
> -nfs_file_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
> - PreallocMode prealloc, BdrvRequestFlags flags,
> - Error **errp)
> -{
> - NFSClient *client = bs->opaque;
> - int ret;
> -
> - if (prealloc != PREALLOC_MODE_OFF) {
> - error_setg(errp, "Unsupported preallocation mode '%s'",
> - PreallocMode_str(prealloc));
> - return -ENOTSUP;
> - }
> -
> - ret = nfs_ftruncate(client->context, client->fh, offset);
> - if (ret < 0) {
> - error_setg_errno(errp, -ret, "Failed to truncate file");
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> -/* 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)
> -{
> - NFSClient *client = bs->opaque;
> -
> - 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);
> - }
> -}
> -
> -static char *nfs_dirname(BlockDriverState *bs, Error **errp)
> -{
> - NFSClient *client = bs->opaque;
> -
> - if (client->uid || client->gid) {
> - bdrv_refresh_filename(bs);
> - error_setg(errp, "Cannot generate a base directory for NFS node
> '%s'",
> - bs->filename);
> - return NULL;
> - }
> -
> - return g_strdup_printf("nfs://%s%s/", client->server->host,
> client->path);
> -}
> -
> -#ifdef LIBNFS_FEATURE_PAGECACHE
> -static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
> - Error **errp)
> -{
> - NFSClient *client = bs->opaque;
> - nfs_pagecache_invalidate(client->context, client->fh);
> -}
> -#endif
> -
> -static const char *nfs_strong_runtime_opts[] = {
> - "path",
> - "user",
> - "group",
> - "server.",
> -
> - NULL
> -};
> -
> -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_co_truncate = nfs_file_co_truncate,
> -
> - .bdrv_file_open = nfs_file_open,
> - .bdrv_close = nfs_file_close,
> - .bdrv_co_create = nfs_file_co_create,
> - .bdrv_co_create_opts = nfs_file_co_create_opts,
> - .bdrv_reopen_prepare = nfs_reopen_prepare,
> -
> - .bdrv_co_preadv = nfs_co_preadv,
> - .bdrv_co_pwritev = nfs_co_pwritev,
> - .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,
> - .bdrv_dirname = nfs_dirname,
> -
> - .strong_runtime_opts = nfs_strong_runtime_opts,
> -
> -#ifdef LIBNFS_FEATURE_PAGECACHE
> - .bdrv_co_invalidate_cache = nfs_co_invalidate_cache,
> -#endif
> -};
> -
> -static void nfs_block_init(void)
> -{
> - bdrv_register(&bdrv_nfs);
> -}
> -
> -block_init(nfs_block_init);
> +/*
> + * QEMU Block driver for native access to files on NFS shares
> + *
> + * Copyright (c) 2014-2017 Peter Lieven <p...@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"
> +
> +#if !defined(_WIN32)
> +#include <poll.h>
> +#endif
> +#include "qemu/config-file.h"
> +#include "qemu/error-report.h"
> +#include "qapi/error.h"
> +#include "block/block_int.h"
> +#include "block/qdict.h"
> +#include "trace.h"
> +#include "qemu/iov.h"
> +#include "qemu/main-loop.h"
> +#include "qemu/module.h"
> +#include "qemu/option.h"
> +#include "qemu/uri.h"
> +#include "qemu/cutils.h"
> +#include "sysemu/sysemu.h"
> +#include "sysemu/replay.h"
> +#include "qapi/qapi-visit-block-core.h"
> +#include "qapi/qmp/qdict.h"
> +#include "qapi/qmp/qstring.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
> +
> +#if defined (_WIN32)
> +#define nfs_stat __stat64
> +#else
> +#define nfs_stat stat
> +#endif
> +
> +typedef struct NFSClient {
> + struct nfs_context *context;
> + struct nfsfh *fh;
> + int events;
> + bool has_zero_init;
> + AioContext *aio_context;
> + QemuMutex mutex;
> + int64_t st_size;
> + 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 nfs_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 (g_strcmp0(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_str(options, "server.host", uri->server);
> + qdict_put_str(options, "server.type", "inet");
> + qdict_put_str(options, "path", uri->path);
> +
> + for (i = 0; i < qp->n; i++) {
> + unsigned long long val;
> + 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, &val, 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_str(options, "user", qp->p[i].value);
> + } else if (!strcmp(qp->p[i].name, "gid")) {
> + qdict_put_str(options, "group", qp->p[i].value);
> + } else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
> + qdict_put_str(options, "tcp-syn-count", qp->p[i].value);
> + } else if (!strcmp(qp->p[i].name, "readahead")) {
> + qdict_put_str(options, "readahead-size", qp->p[i].value);
> + } else if (!strcmp(qp->p[i].name, "pagecache")) {
> + qdict_put_str(options, "page-cache-size", qp->p[i].value);
> + } else if (!strcmp(qp->p[i].name, "debug")) {
> + qdict_put_str(options, "debug", 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);
> +
> +/* Called with QemuMutex held. */
> +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;
> +
> + qemu_mutex_lock(&client->mutex);
> + nfs_service(client->context, POLLIN);
> + nfs_set_events(client);
> + qemu_mutex_unlock(&client->mutex);
> +}
> +
> +static void nfs_process_write(void *arg)
> +{
> + NFSClient *client = arg;
> +
> + qemu_mutex_lock(&client->mutex);
> + nfs_service(client->context, POLLOUT);
> + nfs_set_events(client);
> + qemu_mutex_unlock(&client->mutex);
> +}
> +
> +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;
> + aio_co_wake(task->co);
> +}
> +
> +/* Called (via nfs_service) with QemuMutex held. */
> +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));
> + }
> + replay_bh_schedule_oneshot_event(task->client->aio_context,
> + nfs_co_generic_bh_cb, task);
> +}
> +
> +static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, uint64_t offset,
> + uint64_t bytes, QEMUIOVector *iov,
> + int flags)
> +{
> + NFSClient *client = bs->opaque;
> + NFSRPC task;
> +
> + nfs_co_init_task(bs, &task);
> + task.iov = iov;
> +
> + WITH_QEMU_LOCK_GUARD(&client->mutex) {
> + if (nfs_pread_async(client->context, client->fh,
> + offset, bytes, 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_pwritev(BlockDriverState *bs, uint64_t offset,
> + uint64_t bytes, QEMUIOVector *iov,
> + int flags)
> +{
> + NFSClient *client = bs->opaque;
> + NFSRPC task;
> + char *buf = NULL;
> + bool my_buffer = false;
> +
> + nfs_co_init_task(bs, &task);
> +
> + if (iov->niov != 1) {
> + buf = g_try_malloc(bytes);
> + if (bytes && buf == NULL) {
> + return -ENOMEM;
> + }
> + qemu_iovec_to_buf(iov, 0, buf, bytes);
> + my_buffer = true;
> + } else {
> + buf = iov->iov[0].iov_base;
> + }
> +
> + WITH_QEMU_LOCK_GUARD(&client->mutex) {
> + if (nfs_pwrite_async(client->context, client->fh,
> + offset, bytes, buf,
> + nfs_co_generic_cb, &task) != 0) {
> + if (my_buffer) {
> + g_free(buf);
> + }
> + return -ENOMEM;
> + }
> +
> + nfs_set_events(client);
> + }
> + while (!task.complete) {
> + qemu_coroutine_yield();
> + }
> +
> + if (my_buffer) {
> + g_free(buf);
> + }
> +
> + if (task.ret != bytes) {
> + 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);
> +
> + WITH_QEMU_LOCK_GUARD(&client->mutex) {
> + 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 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) {
> + qemu_mutex_lock(&client->mutex);
> + aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
> + false, NULL, NULL, NULL, NULL);
> + qemu_mutex_unlock(&client->mutex);
> + if (client->fh) {
> + nfs_close(client->context, client->fh);
> + client->fh = NULL;
> + }
> +#ifdef LIBNFS_FEATURE_UMOUNT
> + nfs_umount(client->context);
> +#endif
> + nfs_destroy_context(client->context);
> + client->context = NULL;
> + }
> + g_free(client->path);
> + qemu_mutex_destroy(&client->mutex);
> + qapi_free_NFSServer(client->server);
> + client->server = NULL;
> +}
> +
> +static void nfs_file_close(BlockDriverState *bs)
> +{
> + NFSClient *client = bs->opaque;
> + nfs_client_close(client);
> +}
> +
> +static int64_t nfs_client_open(NFSClient *client, BlockdevOptionsNfs *opts,
> + int flags, int open_flags, Error **errp)
> +{
> + int64_t ret = -EINVAL;
> + struct nfs_stat st;
> + char *file = NULL, *strp = NULL;
> +
> + qemu_mutex_init(&client->mutex);
> +
> + client->path = g_strdup(opts->path);
> +
> + strp = strrchr(client->path, '/');
> + if (strp == NULL) {
> + error_setg(errp, "Invalid URL specified");
> + goto fail;
> + }
> + file = g_strdup(strp);
> + *strp = 0;
> +
> + /* Steal the NFSServer object from opts; set the original pointer to NULL
> + * to avoid use after free and double free. */
> + client->server = opts->server;
> + opts->server = NULL;
> +
> + client->context = nfs_init_context();
> + if (client->context == NULL) {
> + error_setg(errp, "Failed to init NFS context");
> + goto fail;
> + }
> +
> + if (opts->has_user) {
> + client->uid = opts->user;
> + nfs_set_uid(client->context, client->uid);
> + }
> +
> + if (opts->has_group) {
> + client->gid = opts->group;
> + nfs_set_gid(client->context, client->gid);
> + }
> +
> + if (opts->has_tcp_syn_count) {
> + client->tcp_syncnt = opts->tcp_syn_count;
> + nfs_set_tcp_syncnt(client->context, client->tcp_syncnt);
> + }
> +
> +#ifdef LIBNFS_FEATURE_READAHEAD
> + if (opts->has_readahead_size) {
> + if (open_flags & BDRV_O_NOCACHE) {
> + error_setg(errp, "Cannot enable NFS readahead "
> + "if cache.direct = on");
> + goto fail;
> + }
> + client->readahead = opts->readahead_size;
> + if (client->readahead > QEMU_NFS_MAX_READAHEAD_SIZE) {
> + warn_report("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 (opts->has_page_cache_size) {
> + if (open_flags & BDRV_O_NOCACHE) {
> + error_setg(errp, "Cannot enable NFS pagecache "
> + "if cache.direct = on");
> + goto fail;
> + }
> + client->pagecache = opts->page_cache_size;
> + if (client->pagecache > QEMU_NFS_MAX_PAGECACHE_SIZE) {
> + warn_report("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 (opts->has_debug) {
> + client->debug = opts->debug;
> + /* limit the maximum debug level to avoid potential flooding
> + * of our log files. */
> + if (client->debug > QEMU_NFS_MAX_DEBUG_LEVEL) {
> + warn_report("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_size = st.st_size;
> + client->has_zero_init = S_ISREG(st.st_mode);
> + *strp = '/';
> + goto out;
> +
> +fail:
> + nfs_client_close(client);
> +out:
> + g_free(file);
> + return ret;
> +}
> +
> +static BlockdevOptionsNfs *nfs_options_qdict_to_qapi(QDict *options,
> + Error **errp)
> +{
> + BlockdevOptionsNfs *opts = NULL;
> + Visitor *v;
> + const QDictEntry *e;
> +
> + v = qobject_input_visitor_new_flat_confused(options, errp);
> + if (!v) {
> + return NULL;
> + }
> +
> + visit_type_BlockdevOptionsNfs(v, NULL, &opts, errp);
> + visit_free(v);
> + if (!opts) {
> + return NULL;
> + }
> +
> + /* Remove the processed options from the QDict (the visitor processes
> + * _all_ options in the QDict) */
> + while ((e = qdict_first(options))) {
> + qdict_del(options, e->key);
> + }
> +
> + return opts;
> +}
> +
> +static int64_t nfs_client_open_qdict(NFSClient *client, QDict *options,
> + int flags, int open_flags, Error **errp)
> +{
> + BlockdevOptionsNfs *opts;
> + int ret;
> +
> + opts = nfs_options_qdict_to_qapi(options, errp);
> + if (opts == NULL) {
> + ret = -EINVAL;
> + goto fail;
> + }
> +
> + ret = nfs_client_open(client, opts, flags, open_flags, errp);
> +fail:
> + qapi_free_BlockdevOptionsNfs(opts);
> + 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_qdict(client, options,
> + (flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
> + bs->open_flags, errp);
> + if (ret < 0) {
> + return ret;
> + }
> +
> + bs->total_sectors = ret;
> + if (client->has_zero_init) {
> + bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
> + }
> + return 0;
> +}
> +
> +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_co_create(BlockdevCreateOptions *options, Error **errp)
> +{
> + BlockdevCreateOptionsNfs *opts = &options->u.nfs;
> + NFSClient *client = g_new0(NFSClient, 1);
> + int ret;
> +
> + assert(options->driver == BLOCKDEV_DRIVER_NFS);
> +
> + client->aio_context = qemu_get_aio_context();
> +
> + ret = nfs_client_open(client, opts->location, O_CREAT, 0, errp);
> + if (ret < 0) {
> + goto out;
> + }
> + ret = nfs_ftruncate(client->context, client->fh, opts->size);
> + nfs_client_close(client);
> +
> +out:
> + g_free(client);
> + return ret;
> +}
> +
> +static int coroutine_fn nfs_file_co_create_opts(BlockDriver *drv,
> + const char *url,
> + QemuOpts *opts,
> + Error **errp)
> +{
> + BlockdevCreateOptions *create_options;
> + BlockdevCreateOptionsNfs *nfs_opts;
> + QDict *options;
> + int ret;
> +
> + create_options = g_new0(BlockdevCreateOptions, 1);
> + create_options->driver = BLOCKDEV_DRIVER_NFS;
> + nfs_opts = &create_options->u.nfs;
> +
> + /* Read out options */
> + nfs_opts->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;
> + }
> +
> + nfs_opts->location = nfs_options_qdict_to_qapi(options, errp);
> + if (nfs_opts->location == NULL) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + ret = nfs_file_co_create(create_options, errp);
> + if (ret < 0) {
> + goto out;
> + }
> +
> + ret = 0;
> +out:
> + qobject_unref(options);
> + qapi_free_BlockdevCreateOptions(create_options);
> + return ret;
> +}
> +
> +static int nfs_has_zero_init(BlockDriverState *bs)
> +{
> + NFSClient *client = bs->opaque;
> + return client->has_zero_init;
> +}
> +
> +/* Called (via nfs_service) with QemuMutex held. */
> +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));
> + }
> +
> + /* Set task->complete before reading bs->wakeup. */
> + atomic_mb_set(&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 nfs_stat st;
> +
> + if (bdrv_is_read_only(bs) &&
> + !(bs->open_flags & BDRV_O_NOCACHE)) {
> + return client->st_size;
> + }
> +
> + 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_size);
> +}
> +
> +static int coroutine_fn
> +nfs_file_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
> + PreallocMode prealloc, BdrvRequestFlags flags,
> + Error **errp)
> +{
> + NFSClient *client = bs->opaque;
> + int ret;
> +
> + if (prealloc != PREALLOC_MODE_OFF) {
> + error_setg(errp, "Unsupported preallocation mode '%s'",
> + PreallocMode_str(prealloc));
> + return -ENOTSUP;
> + }
> +
> + ret = nfs_ftruncate(client->context, client->fh, offset);
> + if (ret < 0) {
> + error_setg_errno(errp, -ret, "Failed to truncate file");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/* 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 nfs_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_size = st.st_size;
> + }
> +
> + return 0;
> +}
> +
> +static void nfs_refresh_filename(BlockDriverState *bs)
> +{
> + NFSClient *client = bs->opaque;
> +
> + 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);
> + }
> +}
> +
> +static char *nfs_dirname(BlockDriverState *bs, Error **errp)
> +{
> + NFSClient *client = bs->opaque;
> +
> + if (client->uid || client->gid) {
> + bdrv_refresh_filename(bs);
> + error_setg(errp, "Cannot generate a base directory for NFS node
> '%s'",
> + bs->filename);
> + return NULL;
> + }
> +
> + return g_strdup_printf("nfs://%s%s/", client->server->host,
> client->path);
> +}
> +
> +#ifdef LIBNFS_FEATURE_PAGECACHE
> +static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
> + Error **errp)
> +{
> + NFSClient *client = bs->opaque;
> + nfs_pagecache_invalidate(client->context, client->fh);
> +}
> +#endif
> +
> +static const char *nfs_strong_runtime_opts[] = {
> + "path",
> + "user",
> + "group",
> + "server.",
> +
> + NULL
> +};
> +
> +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_co_truncate = nfs_file_co_truncate,
> +
> + .bdrv_file_open = nfs_file_open,
> + .bdrv_close = nfs_file_close,
> + .bdrv_co_create = nfs_file_co_create,
> + .bdrv_co_create_opts = nfs_file_co_create_opts,
> + .bdrv_reopen_prepare = nfs_reopen_prepare,
> +
> + .bdrv_co_preadv = nfs_co_preadv,
> + .bdrv_co_pwritev = nfs_co_pwritev,
> + .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,
> + .bdrv_dirname = nfs_dirname,
> +
> + .strong_runtime_opts = nfs_strong_runtime_opts,
> +
> +#ifdef LIBNFS_FEATURE_PAGECACHE
> + .bdrv_co_invalidate_cache = nfs_co_invalidate_cache,
> +#endif
> +};
> +
> +static void nfs_block_init(void)
> +{
> + bdrv_register(&bdrv_nfs);
> +}
> +
> +block_init(nfs_block_init);
> --
> 2.28.0.windows.1
>
>
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
