We need to implement .bdrv_has_zero_init_truncate() for every block driver that supports truncation and has a .bdrv_has_zero_init() implementation. Implement it the same way each driver implements .bdrv_has_zero_init(). This is at least not any more unsafe than what we had before. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20190724171239.8764-5-mreitz@redhat.com Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
898 lines
25 KiB
C
898 lines
25 KiB
C
/*
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* QEMU Block driver for native access to files on NFS shares
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*
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* Copyright (c) 2014-2017 Peter Lieven <pl@kamp.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include <poll.h>
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "block/block_int.h"
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#include "block/qdict.h"
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#include "trace.h"
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#include "qemu/iov.h"
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#include "qemu/main-loop.h"
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#include "qemu/module.h"
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#include "qemu/option.h"
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#include "qemu/uri.h"
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#include "qemu/cutils.h"
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#include "qapi/qapi-visit-block-core.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/qobject-output-visitor.h"
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#include <nfsc/libnfs.h>
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#define QEMU_NFS_MAX_READAHEAD_SIZE 1048576
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#define QEMU_NFS_MAX_PAGECACHE_SIZE (8388608 / NFS_BLKSIZE)
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#define QEMU_NFS_MAX_DEBUG_LEVEL 2
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typedef struct NFSClient {
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struct nfs_context *context;
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struct nfsfh *fh;
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int events;
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bool has_zero_init;
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AioContext *aio_context;
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QemuMutex mutex;
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blkcnt_t st_blocks;
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bool cache_used;
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NFSServer *server;
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char *path;
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int64_t uid, gid, tcp_syncnt, readahead, pagecache, debug;
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} NFSClient;
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typedef struct NFSRPC {
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BlockDriverState *bs;
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int ret;
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int complete;
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QEMUIOVector *iov;
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struct stat *st;
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Coroutine *co;
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NFSClient *client;
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} NFSRPC;
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static int nfs_parse_uri(const char *filename, QDict *options, Error **errp)
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{
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URI *uri = NULL;
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QueryParams *qp = NULL;
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int ret = -EINVAL, i;
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uri = uri_parse(filename);
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if (!uri) {
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error_setg(errp, "Invalid URI specified");
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goto out;
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}
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if (g_strcmp0(uri->scheme, "nfs") != 0) {
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error_setg(errp, "URI scheme must be 'nfs'");
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goto out;
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}
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if (!uri->server) {
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error_setg(errp, "missing hostname in URI");
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goto out;
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}
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if (!uri->path) {
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error_setg(errp, "missing file path in URI");
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goto out;
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}
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qp = query_params_parse(uri->query);
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if (!qp) {
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error_setg(errp, "could not parse query parameters");
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goto out;
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}
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qdict_put_str(options, "server.host", uri->server);
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qdict_put_str(options, "server.type", "inet");
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qdict_put_str(options, "path", uri->path);
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for (i = 0; i < qp->n; i++) {
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unsigned long long val;
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if (!qp->p[i].value) {
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error_setg(errp, "Value for NFS parameter expected: %s",
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qp->p[i].name);
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goto out;
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}
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if (parse_uint_full(qp->p[i].value, &val, 0)) {
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error_setg(errp, "Illegal value for NFS parameter: %s",
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qp->p[i].name);
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goto out;
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}
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if (!strcmp(qp->p[i].name, "uid")) {
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qdict_put_str(options, "user", qp->p[i].value);
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} else if (!strcmp(qp->p[i].name, "gid")) {
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qdict_put_str(options, "group", qp->p[i].value);
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} else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
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qdict_put_str(options, "tcp-syn-count", qp->p[i].value);
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} else if (!strcmp(qp->p[i].name, "readahead")) {
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qdict_put_str(options, "readahead-size", qp->p[i].value);
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} else if (!strcmp(qp->p[i].name, "pagecache")) {
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qdict_put_str(options, "page-cache-size", qp->p[i].value);
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} else if (!strcmp(qp->p[i].name, "debug")) {
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qdict_put_str(options, "debug", qp->p[i].value);
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} else {
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error_setg(errp, "Unknown NFS parameter name: %s",
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qp->p[i].name);
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goto out;
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}
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}
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ret = 0;
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out:
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if (qp) {
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query_params_free(qp);
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}
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if (uri) {
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uri_free(uri);
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}
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return ret;
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}
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static bool nfs_has_filename_options_conflict(QDict *options, Error **errp)
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{
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const QDictEntry *qe;
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for (qe = qdict_first(options); qe; qe = qdict_next(options, qe)) {
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if (!strcmp(qe->key, "host") ||
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!strcmp(qe->key, "path") ||
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!strcmp(qe->key, "user") ||
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!strcmp(qe->key, "group") ||
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!strcmp(qe->key, "tcp-syn-count") ||
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!strcmp(qe->key, "readahead-size") ||
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!strcmp(qe->key, "page-cache-size") ||
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!strcmp(qe->key, "debug") ||
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strstart(qe->key, "server.", NULL))
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{
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error_setg(errp, "Option %s cannot be used with a filename",
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qe->key);
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return true;
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}
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}
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return false;
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}
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static void nfs_parse_filename(const char *filename, QDict *options,
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Error **errp)
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{
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if (nfs_has_filename_options_conflict(options, errp)) {
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return;
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}
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nfs_parse_uri(filename, options, errp);
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}
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static void nfs_process_read(void *arg);
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static void nfs_process_write(void *arg);
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/* Called with QemuMutex held. */
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static void nfs_set_events(NFSClient *client)
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{
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int ev = nfs_which_events(client->context);
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if (ev != client->events) {
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aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
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false,
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(ev & POLLIN) ? nfs_process_read : NULL,
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(ev & POLLOUT) ? nfs_process_write : NULL,
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NULL, client);
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}
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client->events = ev;
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}
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static void nfs_process_read(void *arg)
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{
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NFSClient *client = arg;
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qemu_mutex_lock(&client->mutex);
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nfs_service(client->context, POLLIN);
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nfs_set_events(client);
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qemu_mutex_unlock(&client->mutex);
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}
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static void nfs_process_write(void *arg)
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{
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NFSClient *client = arg;
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qemu_mutex_lock(&client->mutex);
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nfs_service(client->context, POLLOUT);
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nfs_set_events(client);
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qemu_mutex_unlock(&client->mutex);
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}
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static void nfs_co_init_task(BlockDriverState *bs, NFSRPC *task)
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{
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*task = (NFSRPC) {
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.co = qemu_coroutine_self(),
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.bs = bs,
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.client = bs->opaque,
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};
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}
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static void nfs_co_generic_bh_cb(void *opaque)
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{
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NFSRPC *task = opaque;
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task->complete = 1;
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aio_co_wake(task->co);
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}
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/* Called (via nfs_service) with QemuMutex held. */
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static void
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nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data,
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void *private_data)
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{
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NFSRPC *task = private_data;
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task->ret = ret;
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assert(!task->st);
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if (task->ret > 0 && task->iov) {
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if (task->ret <= task->iov->size) {
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qemu_iovec_from_buf(task->iov, 0, data, task->ret);
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} else {
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task->ret = -EIO;
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}
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}
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if (task->ret < 0) {
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error_report("NFS Error: %s", nfs_get_error(nfs));
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}
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aio_bh_schedule_oneshot(task->client->aio_context,
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nfs_co_generic_bh_cb, task);
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}
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static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, uint64_t offset,
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uint64_t bytes, QEMUIOVector *iov,
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int flags)
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{
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NFSClient *client = bs->opaque;
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NFSRPC task;
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nfs_co_init_task(bs, &task);
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task.iov = iov;
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qemu_mutex_lock(&client->mutex);
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if (nfs_pread_async(client->context, client->fh,
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offset, bytes, nfs_co_generic_cb, &task) != 0) {
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qemu_mutex_unlock(&client->mutex);
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return -ENOMEM;
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}
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nfs_set_events(client);
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qemu_mutex_unlock(&client->mutex);
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while (!task.complete) {
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qemu_coroutine_yield();
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}
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if (task.ret < 0) {
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return task.ret;
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}
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/* zero pad short reads */
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if (task.ret < iov->size) {
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qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret);
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}
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return 0;
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}
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static int coroutine_fn nfs_co_pwritev(BlockDriverState *bs, uint64_t offset,
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uint64_t bytes, QEMUIOVector *iov,
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int flags)
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{
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NFSClient *client = bs->opaque;
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NFSRPC task;
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char *buf = NULL;
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bool my_buffer = false;
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nfs_co_init_task(bs, &task);
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if (iov->niov != 1) {
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buf = g_try_malloc(bytes);
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if (bytes && buf == NULL) {
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return -ENOMEM;
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}
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qemu_iovec_to_buf(iov, 0, buf, bytes);
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my_buffer = true;
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} else {
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buf = iov->iov[0].iov_base;
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}
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qemu_mutex_lock(&client->mutex);
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if (nfs_pwrite_async(client->context, client->fh,
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offset, bytes, buf,
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nfs_co_generic_cb, &task) != 0) {
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qemu_mutex_unlock(&client->mutex);
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if (my_buffer) {
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g_free(buf);
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}
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return -ENOMEM;
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}
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nfs_set_events(client);
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qemu_mutex_unlock(&client->mutex);
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while (!task.complete) {
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qemu_coroutine_yield();
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}
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if (my_buffer) {
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g_free(buf);
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}
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if (task.ret != bytes) {
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return task.ret < 0 ? task.ret : -EIO;
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}
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return 0;
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}
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static int coroutine_fn nfs_co_flush(BlockDriverState *bs)
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{
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NFSClient *client = bs->opaque;
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NFSRPC task;
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nfs_co_init_task(bs, &task);
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qemu_mutex_lock(&client->mutex);
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if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
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&task) != 0) {
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qemu_mutex_unlock(&client->mutex);
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return -ENOMEM;
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}
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nfs_set_events(client);
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qemu_mutex_unlock(&client->mutex);
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while (!task.complete) {
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qemu_coroutine_yield();
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}
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return task.ret;
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}
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static void nfs_detach_aio_context(BlockDriverState *bs)
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{
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NFSClient *client = bs->opaque;
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aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
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false, NULL, NULL, NULL, NULL);
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client->events = 0;
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}
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static void nfs_attach_aio_context(BlockDriverState *bs,
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AioContext *new_context)
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{
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NFSClient *client = bs->opaque;
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client->aio_context = new_context;
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nfs_set_events(client);
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}
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static void nfs_client_close(NFSClient *client)
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{
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if (client->context) {
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if (client->fh) {
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nfs_close(client->context, client->fh);
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client->fh = NULL;
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}
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aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
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false, NULL, NULL, NULL, NULL);
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nfs_destroy_context(client->context);
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client->context = NULL;
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}
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g_free(client->path);
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qemu_mutex_destroy(&client->mutex);
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qapi_free_NFSServer(client->server);
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client->server = NULL;
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}
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static void nfs_file_close(BlockDriverState *bs)
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{
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NFSClient *client = bs->opaque;
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nfs_client_close(client);
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}
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static int64_t nfs_client_open(NFSClient *client, BlockdevOptionsNfs *opts,
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int flags, int open_flags, Error **errp)
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{
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int64_t ret = -EINVAL;
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struct stat st;
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char *file = NULL, *strp = NULL;
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qemu_mutex_init(&client->mutex);
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client->path = g_strdup(opts->path);
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strp = strrchr(client->path, '/');
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if (strp == NULL) {
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error_setg(errp, "Invalid URL specified");
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goto fail;
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}
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file = g_strdup(strp);
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*strp = 0;
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/* Steal the NFSServer object from opts; set the original pointer to NULL
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* to avoid use after free and double free. */
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client->server = opts->server;
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opts->server = NULL;
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client->context = nfs_init_context();
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if (client->context == NULL) {
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error_setg(errp, "Failed to init NFS context");
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goto fail;
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}
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if (opts->has_user) {
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client->uid = opts->user;
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nfs_set_uid(client->context, client->uid);
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}
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if (opts->has_group) {
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client->gid = opts->group;
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nfs_set_gid(client->context, client->gid);
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}
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if (opts->has_tcp_syn_count) {
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client->tcp_syncnt = opts->tcp_syn_count;
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nfs_set_tcp_syncnt(client->context, client->tcp_syncnt);
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}
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#ifdef LIBNFS_FEATURE_READAHEAD
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if (opts->has_readahead_size) {
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if (open_flags & BDRV_O_NOCACHE) {
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error_setg(errp, "Cannot enable NFS readahead "
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"if cache.direct = on");
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goto fail;
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}
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client->readahead = opts->readahead_size;
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if (client->readahead > QEMU_NFS_MAX_READAHEAD_SIZE) {
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warn_report("Truncating NFS readahead size to %d",
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QEMU_NFS_MAX_READAHEAD_SIZE);
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client->readahead = QEMU_NFS_MAX_READAHEAD_SIZE;
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}
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nfs_set_readahead(client->context, client->readahead);
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#ifdef LIBNFS_FEATURE_PAGECACHE
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nfs_set_pagecache_ttl(client->context, 0);
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#endif
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client->cache_used = true;
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}
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#endif
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#ifdef LIBNFS_FEATURE_PAGECACHE
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if (opts->has_page_cache_size) {
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if (open_flags & BDRV_O_NOCACHE) {
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error_setg(errp, "Cannot enable NFS pagecache "
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"if cache.direct = on");
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goto fail;
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}
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client->pagecache = opts->page_cache_size;
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if (client->pagecache > QEMU_NFS_MAX_PAGECACHE_SIZE) {
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warn_report("Truncating NFS pagecache size to %d pages",
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QEMU_NFS_MAX_PAGECACHE_SIZE);
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client->pagecache = QEMU_NFS_MAX_PAGECACHE_SIZE;
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}
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nfs_set_pagecache(client->context, client->pagecache);
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nfs_set_pagecache_ttl(client->context, 0);
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client->cache_used = true;
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}
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#endif
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#ifdef LIBNFS_FEATURE_DEBUG
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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;
|
|
Error *local_err = NULL;
|
|
|
|
v = qobject_input_visitor_new_flat_confused(options, errp);
|
|
if (!v) {
|
|
return NULL;
|
|
}
|
|
|
|
visit_type_BlockdevOptionsNfs(v, NULL, &opts, &local_err);
|
|
visit_free(v);
|
|
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
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;
|
|
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_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(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,
|
|
PreallocMode prealloc, 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_has_zero_init_truncate = 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);
|