| /* |
| * QEMU Block driver for native access to files on NFS shares |
| * |
| * Copyright (c) 2014-2017 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" |
| |
| #if !defined(_WIN32) |
| #include <poll.h> |
| #endif |
| #include "qemu/config-file.h" |
| #include "qemu/error-report.h" |
| #include "qapi/error.h" |
| #include "block/block-io.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/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; |
| uint64_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); |
| } |
| 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), |
| (ev & POLLIN) ? nfs_process_read : NULL, |
| (ev & POLLOUT) ? nfs_process_write : NULL, |
| 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 coroutine_fn 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, int64_t offset, |
| int64_t bytes, QEMUIOVector *iov, |
| BdrvRequestFlags 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, int64_t offset, |
| int64_t bytes, QEMUIOVector *iov, |
| BdrvRequestFlags 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), |
| NULL, 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), |
| NULL, 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; |
| #ifdef _WIN32 |
| struct __stat64 st; |
| #else |
| struct stat st; |
| #endif |
| 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); |
| #if !defined(_WIN32) |
| client->st_blocks = st.st_blocks; |
| #endif |
| 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; |
| int64_t 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; |
| } |
| |
| #if !defined(_WIN32) |
| /* 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)); |
| } |
| replay_bh_schedule_oneshot_event(task->client->aio_context, |
| nfs_co_generic_bh_cb, task); |
| } |
| |
| static int64_t coroutine_fn nfs_co_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; |
| } |
| |
| nfs_co_init_task(bs, &task); |
| task.st = &st; |
| WITH_QEMU_LOCK_GUARD(&client->mutex) { |
| if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb, |
| &task) != 0) { |
| return -ENOMEM; |
| } |
| |
| nfs_set_events(client); |
| } |
| while (!task.complete) { |
| qemu_coroutine_yield(); |
| } |
| |
| return (task.ret < 0 ? task.ret : st.st_blocks * 512); |
| } |
| #endif |
| |
| 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; |
| #ifdef _WIN32 |
| struct __stat64 st; |
| #else |
| struct stat st; |
| #endif |
| 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; |
| } |
| #if !defined(_WIN32) |
| client->st_blocks = st.st_blocks; |
| #endif |
| } |
| |
| 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, |
| /* libnfs does not provide the allocated filesize of a file on win32. */ |
| #if !defined(_WIN32) |
| .bdrv_co_get_allocated_file_size = nfs_co_get_allocated_file_size, |
| #endif |
| .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); |
