490 lines
13 KiB
C
490 lines
13 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 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 "config-host.h"
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#include <poll.h>
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#include "qemu-common.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "block/block_int.h"
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#include "trace.h"
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#include "qemu/iov.h"
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#include "qemu/uri.h"
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#include "sysemu/sysemu.h"
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#include <nfsc/libnfs.h>
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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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} NFSClient;
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typedef struct NFSRPC {
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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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QEMUBH *bh;
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NFSClient *client;
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} NFSRPC;
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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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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,
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nfs_get_fd(client->context),
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(ev & POLLIN) ? nfs_process_read : NULL,
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(ev & POLLOUT) ? nfs_process_write : NULL,
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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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nfs_service(client->context, POLLIN);
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nfs_set_events(client);
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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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nfs_service(client->context, POLLOUT);
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nfs_set_events(client);
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}
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static void nfs_co_init_task(NFSClient *client, NFSRPC *task)
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{
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*task = (NFSRPC) {
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.co = qemu_coroutine_self(),
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.client = client,
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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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qemu_bh_delete(task->bh);
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qemu_coroutine_enter(task->co, NULL);
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}
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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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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 && task->st) {
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memcpy(task->st, data, sizeof(struct stat));
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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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if (task->co) {
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task->bh = aio_bh_new(task->client->aio_context,
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nfs_co_generic_bh_cb, task);
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qemu_bh_schedule(task->bh);
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} else {
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task->complete = 1;
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}
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}
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static int coroutine_fn nfs_co_readv(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *iov)
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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(client, &task);
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task.iov = iov;
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if (nfs_pread_async(client->context, client->fh,
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sector_num * BDRV_SECTOR_SIZE,
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nb_sectors * BDRV_SECTOR_SIZE,
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nfs_co_generic_cb, &task) != 0) {
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return -ENOMEM;
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}
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while (!task.complete) {
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nfs_set_events(client);
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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_writev(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *iov)
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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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nfs_co_init_task(client, &task);
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buf = g_try_malloc(nb_sectors * BDRV_SECTOR_SIZE);
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if (nb_sectors && buf == NULL) {
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return -ENOMEM;
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}
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qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
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if (nfs_pwrite_async(client->context, client->fh,
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sector_num * BDRV_SECTOR_SIZE,
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nb_sectors * BDRV_SECTOR_SIZE,
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buf, nfs_co_generic_cb, &task) != 0) {
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g_free(buf);
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return -ENOMEM;
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}
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while (!task.complete) {
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nfs_set_events(client);
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qemu_coroutine_yield();
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}
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g_free(buf);
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if (task.ret != nb_sectors * BDRV_SECTOR_SIZE) {
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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(client, &task);
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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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return -ENOMEM;
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}
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while (!task.complete) {
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nfs_set_events(client);
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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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/* TODO Convert to fine grained options */
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static QemuOptsList runtime_opts = {
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.name = "nfs",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
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.desc = {
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{
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.name = "filename",
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.type = QEMU_OPT_STRING,
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.help = "URL to the NFS file",
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},
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{ /* end of list */ }
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},
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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,
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nfs_get_fd(client->context),
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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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}
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aio_set_fd_handler(client->aio_context,
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nfs_get_fd(client->context),
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NULL, NULL, NULL);
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nfs_destroy_context(client->context);
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}
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memset(client, 0, sizeof(NFSClient));
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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, const char *filename,
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int flags, Error **errp)
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{
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int ret = -EINVAL, i;
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struct stat st;
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URI *uri;
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QueryParams *qp = NULL;
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char *file = NULL, *strp = NULL;
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uri = uri_parse(filename);
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if (!uri) {
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error_setg(errp, "Invalid URL specified");
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goto fail;
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}
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if (!uri->server) {
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error_setg(errp, "Invalid URL specified");
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goto fail;
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}
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strp = strrchr(uri->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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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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qp = query_params_parse(uri->query);
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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 fail;
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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 fail;
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}
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if (!strcmp(qp->p[i].name, "uid")) {
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nfs_set_uid(client->context, val);
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} else if (!strcmp(qp->p[i].name, "gid")) {
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nfs_set_gid(client->context, val);
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} else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
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nfs_set_tcp_syncnt(client->context, val);
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#ifdef LIBNFS_FEATURE_READAHEAD
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} else if (!strcmp(qp->p[i].name, "readahead")) {
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nfs_set_readahead(client->context, val);
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#endif
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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 fail;
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}
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}
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ret = nfs_mount(client->context, uri->server, uri->path);
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if (ret < 0) {
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error_setg(errp, "Failed to mount nfs share: %s",
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nfs_get_error(client->context));
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goto fail;
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}
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if (flags & O_CREAT) {
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ret = nfs_creat(client->context, file, 0600, &client->fh);
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if (ret < 0) {
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error_setg(errp, "Failed to create file: %s",
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nfs_get_error(client->context));
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goto fail;
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}
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} else {
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ret = nfs_open(client->context, file, flags, &client->fh);
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if (ret < 0) {
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error_setg(errp, "Failed to open file : %s",
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nfs_get_error(client->context));
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goto fail;
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}
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}
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ret = nfs_fstat(client->context, client->fh, &st);
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if (ret < 0) {
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error_setg(errp, "Failed to fstat file: %s",
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nfs_get_error(client->context));
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goto fail;
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}
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ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
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client->has_zero_init = S_ISREG(st.st_mode);
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goto out;
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fail:
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nfs_client_close(client);
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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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uri_free(uri);
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g_free(file);
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return ret;
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}
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static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp) {
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NFSClient *client = bs->opaque;
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int64_t ret;
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QemuOpts *opts;
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Error *local_err = NULL;
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client->aio_context = bdrv_get_aio_context(bs);
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opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
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qemu_opts_absorb_qdict(opts, options, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return -EINVAL;
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}
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ret = nfs_client_open(client, qemu_opt_get(opts, "filename"),
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(flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
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errp);
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if (ret < 0) {
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return ret;
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}
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bs->total_sectors = ret;
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return 0;
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}
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static int nfs_file_create(const char *url, QemuOpts *opts, Error **errp)
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{
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int ret = 0;
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int64_t total_size = 0;
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NFSClient *client = g_new0(NFSClient, 1);
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client->aio_context = qemu_get_aio_context();
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/* Read out options */
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total_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
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ret = nfs_client_open(client, url, O_CREAT, errp);
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if (ret < 0) {
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goto out;
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}
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ret = nfs_ftruncate(client->context, client->fh, total_size);
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nfs_client_close(client);
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out:
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g_free(client);
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return ret;
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}
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static int nfs_has_zero_init(BlockDriverState *bs)
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{
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NFSClient *client = bs->opaque;
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return client->has_zero_init;
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}
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static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
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{
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NFSClient *client = bs->opaque;
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NFSRPC task = {0};
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struct stat st;
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task.st = &st;
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if (nfs_fstat_async(client->context, client->fh, nfs_co_generic_cb,
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&task) != 0) {
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return -ENOMEM;
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}
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while (!task.complete) {
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nfs_set_events(client);
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aio_poll(client->aio_context, true);
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}
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return (task.ret < 0 ? task.ret : st.st_blocks * st.st_blksize);
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}
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static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
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{
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NFSClient *client = bs->opaque;
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return nfs_ftruncate(client->context, client->fh, offset);
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}
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static BlockDriver bdrv_nfs = {
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.format_name = "nfs",
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.protocol_name = "nfs",
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.instance_size = sizeof(NFSClient),
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.bdrv_needs_filename = true,
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.bdrv_has_zero_init = nfs_has_zero_init,
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.bdrv_get_allocated_file_size = nfs_get_allocated_file_size,
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.bdrv_truncate = nfs_file_truncate,
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.bdrv_file_open = nfs_file_open,
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.bdrv_close = nfs_file_close,
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.bdrv_create = nfs_file_create,
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.bdrv_co_readv = nfs_co_readv,
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.bdrv_co_writev = nfs_co_writev,
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.bdrv_co_flush_to_disk = nfs_co_flush,
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.bdrv_detach_aio_context = nfs_detach_aio_context,
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.bdrv_attach_aio_context = nfs_attach_aio_context,
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};
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static void nfs_block_init(void)
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{
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bdrv_register(&bdrv_nfs);
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}
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block_init(nfs_block_init);
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