-----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJanYJPAAoJEH8JsnLIjy/WxjUQAJA+DTOmGXvaNpMs65BrU79K /r/iGVrzHv/RMLmrWMnqj96W9SnpMuiAP9hVLNsekqClY9q4ME4DpGcXhWfhSvF5 FC51ehvFJdfo8cPorsevcqNj60iWebjcx3lFfUq2606UOyYih3oijYxr6gSwWbRc GAgdGMqsvGYpzgqAQVEWHUhaX0La49/OzY42aR+E+LCBNfTYvlydvyoc+tUTdIpW 1eM/ASGndGsN0Cf2vxlbKgJ0/P6v+cRZuuIDhKZqre+YG+yM+pq7yZb+o7nf/P36 TPR93BsT7FSVAizRK7VFRuPIynHpiaxYygrJERCXF0sxsV4OlKjpmt/uUPamWFh+ 46Jx2NK1AuAx87BdErgmA119ObO3oAPxK0+2p981obb6SphTbbPxDj6SOlYCt4mJ mhff4JtIiwCmDSckAwd2mkBI1Tvl9qqcELrpyd2t2eU4ec2vf7fPd85EsK/Mq6Kr dbfqFvjNaaMxChoqFgkHAveYJ7zYqRFI2IY5o9c1QyZehCGPWjScxHXZZYdpDl59 YF9DkYQDOyvEX2jmMECaO1r/0nnO+BqQHu5ItJuTte9rjP9Q0do3iBISiIefewtf yji6/QNn2hFrnr1HPAwLFFC3kPgc8Mq8mIUb53j8vG/01KhVRCcnJm2K6D4IUwLZ S6ZnQJB97eE4y7YR5dNt =2axz -----END PGP SIGNATURE----- Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging Block layer patches # gpg: Signature made Mon 05 Mar 2018 17:45:51 GMT # gpg: using RSA key 7F09B272C88F2FD6 # gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" # Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6 * remotes/kevin/tags/for-upstream: (38 commits) block: Fix NULL dereference on empty drive error qcow2: Replace align_offset() with ROUND_UP() block/ssh: Add basic .bdrv_truncate() block/ssh: Make ssh_grow_file() blocking block/ssh: Pull ssh_grow_file() from ssh_create() qemu-img: Make resize error message more general qcow2: make qcow2_co_create2() a coroutine_fn block: rename .bdrv_create() to .bdrv_co_create_opts() Revert "IDE: Do not flush empty CDROM drives" block: test blk_aio_flush() with blk->root == NULL block: add BlockBackend->in_flight counter block: extract AIO_WAIT_WHILE() from BlockDriverState aio: rename aio_context_in_iothread() to in_aio_context_home_thread() docs: document how to use the l2-cache-entry-size parameter specs/qcow2: Fix documentation of the compressed cluster descriptor iotest 033: add misaligned write-zeroes test via truncate block: fix write with zero flag set and iovector provided block: Drop unused .bdrv_co_get_block_status() vvfat: Switch to .bdrv_co_block_status() vpc: Switch to .bdrv_co_block_status() ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org> # Conflicts: # include/block/block.h
923 lines
26 KiB
C
923 lines
26 KiB
C
/*
|
|
* 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"
|
|
|
|
#include <poll.h>
|
|
#include "qemu/config-file.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qapi/error.h"
|
|
#include "block/block_int.h"
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|
#include "trace.h"
|
|
#include "qemu/iov.h"
|
|
#include "qemu/option.h"
|
|
#include "qemu/uri.h"
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|
#include "qemu/cutils.h"
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|
#include "sysemu/sysemu.h"
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|
#include "qapi/qapi-visit-block-core.h"
|
|
#include "qapi/qmp/qdict.h"
|
|
#include "qapi/qmp/qstring.h"
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|
#include "qapi/qobject-input-visitor.h"
|
|
#include "qapi/qobject-output-visitor.h"
|
|
#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)
|
|
#define QEMU_NFS_MAX_DEBUG_LEVEL 2
|
|
|
|
typedef struct NFSClient {
|
|
struct nfs_context *context;
|
|
struct nfsfh *fh;
|
|
int events;
|
|
bool has_zero_init;
|
|
AioContext *aio_context;
|
|
QemuMutex mutex;
|
|
blkcnt_t st_blocks;
|
|
bool cache_used;
|
|
NFSServer *server;
|
|
char *path;
|
|
int64_t uid, gid, tcp_syncnt, readahead, pagecache, debug;
|
|
} NFSClient;
|
|
|
|
typedef struct NFSRPC {
|
|
BlockDriverState *bs;
|
|
int ret;
|
|
int complete;
|
|
QEMUIOVector *iov;
|
|
struct stat *st;
|
|
Coroutine *co;
|
|
NFSClient *client;
|
|
} NFSRPC;
|
|
|
|
static int nfs_parse_uri(const char *filename, QDict *options, Error **errp)
|
|
{
|
|
URI *uri = NULL;
|
|
QueryParams *qp = NULL;
|
|
int ret = -EINVAL, i;
|
|
|
|
uri = uri_parse(filename);
|
|
if (!uri) {
|
|
error_setg(errp, "Invalid URI specified");
|
|
goto out;
|
|
}
|
|
if (g_strcmp0(uri->scheme, "nfs") != 0) {
|
|
error_setg(errp, "URI scheme must be 'nfs'");
|
|
goto out;
|
|
}
|
|
|
|
if (!uri->server) {
|
|
error_setg(errp, "missing hostname in URI");
|
|
goto out;
|
|
}
|
|
|
|
if (!uri->path) {
|
|
error_setg(errp, "missing file path in URI");
|
|
goto out;
|
|
}
|
|
|
|
qp = query_params_parse(uri->query);
|
|
if (!qp) {
|
|
error_setg(errp, "could not parse query parameters");
|
|
goto out;
|
|
}
|
|
|
|
qdict_put_str(options, "server.host", uri->server);
|
|
qdict_put_str(options, "server.type", "inet");
|
|
qdict_put_str(options, "path", uri->path);
|
|
|
|
for (i = 0; i < qp->n; i++) {
|
|
unsigned long long val;
|
|
if (!qp->p[i].value) {
|
|
error_setg(errp, "Value for NFS parameter expected: %s",
|
|
qp->p[i].name);
|
|
goto out;
|
|
}
|
|
if (parse_uint_full(qp->p[i].value, &val, 0)) {
|
|
error_setg(errp, "Illegal value for NFS parameter: %s",
|
|
qp->p[i].name);
|
|
goto out;
|
|
}
|
|
if (!strcmp(qp->p[i].name, "uid")) {
|
|
qdict_put_str(options, "user", qp->p[i].value);
|
|
} else if (!strcmp(qp->p[i].name, "gid")) {
|
|
qdict_put_str(options, "group", qp->p[i].value);
|
|
} else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
|
|
qdict_put_str(options, "tcp-syn-count", qp->p[i].value);
|
|
} else if (!strcmp(qp->p[i].name, "readahead")) {
|
|
qdict_put_str(options, "readahead-size", qp->p[i].value);
|
|
} else if (!strcmp(qp->p[i].name, "pagecache")) {
|
|
qdict_put_str(options, "page-cache-size", qp->p[i].value);
|
|
} else if (!strcmp(qp->p[i].name, "debug")) {
|
|
qdict_put_str(options, "debug", qp->p[i].value);
|
|
} else {
|
|
error_setg(errp, "Unknown NFS parameter name: %s",
|
|
qp->p[i].name);
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
if (qp) {
|
|
query_params_free(qp);
|
|
}
|
|
if (uri) {
|
|
uri_free(uri);
|
|
}
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|
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") ||
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!strcmp(qe->key, "user") ||
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|
!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") ||
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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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|
}
|
|
|
|
static void nfs_parse_filename(const char *filename, QDict *options,
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|
Error **errp)
|
|
{
|
|
if (nfs_has_filename_options_conflict(options, errp)) {
|
|
return;
|
|
}
|
|
|
|
nfs_parse_uri(filename, options, errp);
|
|
}
|
|
|
|
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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|
{
|
|
int ev = nfs_which_events(client->context);
|
|
if (ev != client->events) {
|
|
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;
|
|
}
|
|
|
|
static void nfs_process_read(void *arg)
|
|
{
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|
NFSClient *client = arg;
|
|
|
|
qemu_mutex_lock(&client->mutex);
|
|
nfs_service(client->context, POLLIN);
|
|
nfs_set_events(client);
|
|
qemu_mutex_unlock(&client->mutex);
|
|
}
|
|
|
|
static void nfs_process_write(void *arg)
|
|
{
|
|
NFSClient *client = arg;
|
|
|
|
qemu_mutex_lock(&client->mutex);
|
|
nfs_service(client->context, POLLOUT);
|
|
nfs_set_events(client);
|
|
qemu_mutex_unlock(&client->mutex);
|
|
}
|
|
|
|
static void nfs_co_init_task(BlockDriverState *bs, NFSRPC *task)
|
|
{
|
|
*task = (NFSRPC) {
|
|
.co = qemu_coroutine_self(),
|
|
.bs = bs,
|
|
.client = bs->opaque,
|
|
};
|
|
}
|
|
|
|
static void nfs_co_generic_bh_cb(void *opaque)
|
|
{
|
|
NFSRPC *task = opaque;
|
|
|
|
task->complete = 1;
|
|
aio_co_wake(task->co);
|
|
}
|
|
|
|
/* Called (via nfs_service) with QemuMutex held. */
|
|
static void
|
|
nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data,
|
|
void *private_data)
|
|
{
|
|
NFSRPC *task = private_data;
|
|
task->ret = ret;
|
|
assert(!task->st);
|
|
if (task->ret > 0 && task->iov) {
|
|
if (task->ret <= task->iov->size) {
|
|
qemu_iovec_from_buf(task->iov, 0, data, task->ret);
|
|
} else {
|
|
task->ret = -EIO;
|
|
}
|
|
}
|
|
if (task->ret < 0) {
|
|
error_report("NFS Error: %s", nfs_get_error(nfs));
|
|
}
|
|
aio_bh_schedule_oneshot(task->client->aio_context,
|
|
nfs_co_generic_bh_cb, task);
|
|
}
|
|
|
|
static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *iov,
|
|
int flags)
|
|
{
|
|
NFSClient *client = bs->opaque;
|
|
NFSRPC task;
|
|
|
|
nfs_co_init_task(bs, &task);
|
|
task.iov = iov;
|
|
|
|
qemu_mutex_lock(&client->mutex);
|
|
if (nfs_pread_async(client->context, client->fh,
|
|
offset, bytes, nfs_co_generic_cb, &task) != 0) {
|
|
qemu_mutex_unlock(&client->mutex);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nfs_set_events(client);
|
|
qemu_mutex_unlock(&client->mutex);
|
|
while (!task.complete) {
|
|
qemu_coroutine_yield();
|
|
}
|
|
|
|
if (task.ret < 0) {
|
|
return task.ret;
|
|
}
|
|
|
|
/* zero pad short reads */
|
|
if (task.ret < iov->size) {
|
|
qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn nfs_co_pwritev(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *iov,
|
|
int flags)
|
|
{
|
|
NFSClient *client = bs->opaque;
|
|
NFSRPC task;
|
|
char *buf = NULL;
|
|
bool my_buffer = false;
|
|
|
|
nfs_co_init_task(bs, &task);
|
|
|
|
if (iov->niov != 1) {
|
|
buf = g_try_malloc(bytes);
|
|
if (bytes && buf == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
qemu_iovec_to_buf(iov, 0, buf, bytes);
|
|
my_buffer = true;
|
|
} else {
|
|
buf = iov->iov[0].iov_base;
|
|
}
|
|
|
|
qemu_mutex_lock(&client->mutex);
|
|
if (nfs_pwrite_async(client->context, client->fh,
|
|
offset, bytes, buf,
|
|
nfs_co_generic_cb, &task) != 0) {
|
|
qemu_mutex_unlock(&client->mutex);
|
|
if (my_buffer) {
|
|
g_free(buf);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nfs_set_events(client);
|
|
qemu_mutex_unlock(&client->mutex);
|
|
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);
|
|
|
|
qemu_mutex_lock(&client->mutex);
|
|
if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
|
|
&task) != 0) {
|
|
qemu_mutex_unlock(&client->mutex);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nfs_set_events(client);
|
|
qemu_mutex_unlock(&client->mutex);
|
|
while (!task.complete) {
|
|
qemu_coroutine_yield();
|
|
}
|
|
|
|
return task.ret;
|
|
}
|
|
|
|
static QemuOptsList runtime_opts = {
|
|
.name = "nfs",
|
|
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "path",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Path of the image on the host",
|
|
},
|
|
{
|
|
.name = "user",
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "UID value to use when talking to the server",
|
|
},
|
|
{
|
|
.name = "group",
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "GID value to use when talking to the server",
|
|
},
|
|
{
|
|
.name = "tcp-syn-count",
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "Number of SYNs to send during the session establish",
|
|
},
|
|
{
|
|
.name = "readahead-size",
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "Set the readahead size in bytes",
|
|
},
|
|
{
|
|
.name = "page-cache-size",
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "Set the pagecache size in bytes",
|
|
},
|
|
{
|
|
.name = "debug",
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "Set the NFS debug level (max 2)",
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
static void nfs_detach_aio_context(BlockDriverState *bs)
|
|
{
|
|
NFSClient *client = bs->opaque;
|
|
|
|
aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
|
|
false, NULL, NULL, NULL, NULL);
|
|
client->events = 0;
|
|
}
|
|
|
|
static void nfs_attach_aio_context(BlockDriverState *bs,
|
|
AioContext *new_context)
|
|
{
|
|
NFSClient *client = bs->opaque;
|
|
|
|
client->aio_context = new_context;
|
|
nfs_set_events(client);
|
|
}
|
|
|
|
static void nfs_client_close(NFSClient *client)
|
|
{
|
|
if (client->context) {
|
|
if (client->fh) {
|
|
nfs_close(client->context, client->fh);
|
|
client->fh = NULL;
|
|
}
|
|
aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
|
|
false, NULL, NULL, NULL, NULL);
|
|
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 NFSServer *nfs_config(QDict *options, Error **errp)
|
|
{
|
|
NFSServer *server = NULL;
|
|
QDict *addr = NULL;
|
|
QObject *crumpled_addr = NULL;
|
|
Visitor *iv = NULL;
|
|
Error *local_error = NULL;
|
|
|
|
qdict_extract_subqdict(options, &addr, "server.");
|
|
if (!qdict_size(addr)) {
|
|
error_setg(errp, "NFS server address missing");
|
|
goto out;
|
|
}
|
|
|
|
crumpled_addr = qdict_crumple(addr, errp);
|
|
if (!crumpled_addr) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Caution: this works only because all scalar members of
|
|
* NFSServer are QString in @crumpled_addr. The visitor expects
|
|
* @crumpled_addr to be typed according to the QAPI schema. It
|
|
* is when @options come from -blockdev or blockdev_add. But when
|
|
* they come from -drive, they're all QString.
|
|
*/
|
|
iv = qobject_input_visitor_new(crumpled_addr);
|
|
visit_type_NFSServer(iv, NULL, &server, &local_error);
|
|
if (local_error) {
|
|
error_propagate(errp, local_error);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
QDECREF(addr);
|
|
qobject_decref(crumpled_addr);
|
|
visit_free(iv);
|
|
return server;
|
|
}
|
|
|
|
|
|
static int64_t nfs_client_open(NFSClient *client, QDict *options,
|
|
int flags, int open_flags, Error **errp)
|
|
{
|
|
int64_t ret = -EINVAL;
|
|
QemuOpts *opts = NULL;
|
|
Error *local_err = NULL;
|
|
struct stat st;
|
|
char *file = NULL, *strp = NULL;
|
|
|
|
qemu_mutex_init(&client->mutex);
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
client->path = g_strdup(qemu_opt_get(opts, "path"));
|
|
if (!client->path) {
|
|
ret = -EINVAL;
|
|
error_setg(errp, "No path was specified");
|
|
goto fail;
|
|
}
|
|
|
|
strp = strrchr(client->path, '/');
|
|
if (strp == NULL) {
|
|
error_setg(errp, "Invalid URL specified");
|
|
goto fail;
|
|
}
|
|
file = g_strdup(strp);
|
|
*strp = 0;
|
|
|
|
/* Pop the config into our state object, Exit if invalid */
|
|
client->server = nfs_config(options, errp);
|
|
if (!client->server) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
client->context = nfs_init_context();
|
|
if (client->context == NULL) {
|
|
error_setg(errp, "Failed to init NFS context");
|
|
goto fail;
|
|
}
|
|
|
|
if (qemu_opt_get(opts, "user")) {
|
|
client->uid = qemu_opt_get_number(opts, "user", 0);
|
|
nfs_set_uid(client->context, client->uid);
|
|
}
|
|
|
|
if (qemu_opt_get(opts, "group")) {
|
|
client->gid = qemu_opt_get_number(opts, "group", 0);
|
|
nfs_set_gid(client->context, client->gid);
|
|
}
|
|
|
|
if (qemu_opt_get(opts, "tcp-syn-count")) {
|
|
client->tcp_syncnt = qemu_opt_get_number(opts, "tcp-syn-count", 0);
|
|
nfs_set_tcp_syncnt(client->context, client->tcp_syncnt);
|
|
}
|
|
|
|
#ifdef LIBNFS_FEATURE_READAHEAD
|
|
if (qemu_opt_get(opts, "readahead-size")) {
|
|
if (open_flags & BDRV_O_NOCACHE) {
|
|
error_setg(errp, "Cannot enable NFS readahead "
|
|
"if cache.direct = on");
|
|
goto fail;
|
|
}
|
|
client->readahead = qemu_opt_get_number(opts, "readahead-size", 0);
|
|
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 (qemu_opt_get(opts, "page-cache-size")) {
|
|
if (open_flags & BDRV_O_NOCACHE) {
|
|
error_setg(errp, "Cannot enable NFS pagecache "
|
|
"if cache.direct = on");
|
|
goto fail;
|
|
}
|
|
client->pagecache = qemu_opt_get_number(opts, "page-cache-size", 0);
|
|
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 (qemu_opt_get(opts, "debug")) {
|
|
client->debug = qemu_opt_get_number(opts, "debug", 0);
|
|
/* limit the maximum debug level to avoid potential flooding
|
|
* of our log files. */
|
|
if (client->debug > QEMU_NFS_MAX_DEBUG_LEVEL) {
|
|
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:
|
|
qemu_opts_del(opts);
|
|
g_free(file);
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp) {
|
|
NFSClient *client = bs->opaque;
|
|
int64_t ret;
|
|
|
|
client->aio_context = bdrv_get_aio_context(bs);
|
|
|
|
ret = nfs_client_open(client, options,
|
|
(flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
|
|
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 coroutine_fn nfs_file_co_create_opts(const char *url, QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
int64_t ret, total_size;
|
|
NFSClient *client = g_new0(NFSClient, 1);
|
|
QDict *options = NULL;
|
|
|
|
client->aio_context = qemu_get_aio_context();
|
|
|
|
/* Read out options */
|
|
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
|
|
BDRV_SECTOR_SIZE);
|
|
|
|
options = qdict_new();
|
|
ret = nfs_parse_uri(url, options, errp);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
ret = nfs_client_open(client, options, O_CREAT, 0, errp);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
ret = nfs_ftruncate(client->context, client->fh, total_size);
|
|
nfs_client_close(client);
|
|
out:
|
|
QDECREF(options);
|
|
g_free(client);
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_has_zero_init(BlockDriverState *bs)
|
|
{
|
|
NFSClient *client = bs->opaque;
|
|
return client->has_zero_init;
|
|
}
|
|
|
|
/* 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 nfs_file_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, QDict *options)
|
|
{
|
|
NFSClient *client = bs->opaque;
|
|
QDict *opts = qdict_new();
|
|
QObject *server_qdict;
|
|
Visitor *ov;
|
|
|
|
qdict_put_str(opts, "driver", "nfs");
|
|
|
|
if (client->uid && !client->gid) {
|
|
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
|
|
"nfs://%s%s?uid=%" PRId64, client->server->host, client->path,
|
|
client->uid);
|
|
} else if (!client->uid && client->gid) {
|
|
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
|
|
"nfs://%s%s?gid=%" PRId64, client->server->host, client->path,
|
|
client->gid);
|
|
} else if (client->uid && client->gid) {
|
|
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
|
|
"nfs://%s%s?uid=%" PRId64 "&gid=%" PRId64,
|
|
client->server->host, client->path, client->uid, client->gid);
|
|
} else {
|
|
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
|
|
"nfs://%s%s", client->server->host, client->path);
|
|
}
|
|
|
|
ov = qobject_output_visitor_new(&server_qdict);
|
|
visit_type_NFSServer(ov, NULL, &client->server, &error_abort);
|
|
visit_complete(ov, &server_qdict);
|
|
qdict_put_obj(opts, "server", server_qdict);
|
|
qdict_put_str(opts, "path", client->path);
|
|
|
|
if (client->uid) {
|
|
qdict_put_int(opts, "user", client->uid);
|
|
}
|
|
if (client->gid) {
|
|
qdict_put_int(opts, "group", client->gid);
|
|
}
|
|
if (client->tcp_syncnt) {
|
|
qdict_put_int(opts, "tcp-syn-cnt", client->tcp_syncnt);
|
|
}
|
|
if (client->readahead) {
|
|
qdict_put_int(opts, "readahead-size", client->readahead);
|
|
}
|
|
if (client->pagecache) {
|
|
qdict_put_int(opts, "page-cache-size", client->pagecache);
|
|
}
|
|
if (client->debug) {
|
|
qdict_put_int(opts, "debug", client->debug);
|
|
}
|
|
|
|
visit_free(ov);
|
|
qdict_flatten(opts);
|
|
bs->full_open_options = opts;
|
|
}
|
|
|
|
#ifdef LIBNFS_FEATURE_PAGECACHE
|
|
static void nfs_invalidate_cache(BlockDriverState *bs,
|
|
Error **errp)
|
|
{
|
|
NFSClient *client = bs->opaque;
|
|
nfs_pagecache_invalidate(client->context, client->fh);
|
|
}
|
|
#endif
|
|
|
|
static BlockDriver bdrv_nfs = {
|
|
.format_name = "nfs",
|
|
.protocol_name = "nfs",
|
|
|
|
.instance_size = sizeof(NFSClient),
|
|
.bdrv_parse_filename = nfs_parse_filename,
|
|
.create_opts = &nfs_create_opts,
|
|
|
|
.bdrv_has_zero_init = nfs_has_zero_init,
|
|
.bdrv_get_allocated_file_size = nfs_get_allocated_file_size,
|
|
.bdrv_truncate = nfs_file_truncate,
|
|
|
|
.bdrv_file_open = nfs_file_open,
|
|
.bdrv_close = nfs_file_close,
|
|
.bdrv_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,
|
|
|
|
#ifdef LIBNFS_FEATURE_PAGECACHE
|
|
.bdrv_invalidate_cache = nfs_invalidate_cache,
|
|
#endif
|
|
};
|
|
|
|
static void nfs_block_init(void)
|
|
{
|
|
bdrv_register(&bdrv_nfs);
|
|
}
|
|
|
|
block_init(nfs_block_init);
|