/*
* QEMU Block driver for native access to files on NFS shares
*
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* THE SOFTWARE.
*/
-#include "config-host.h"
+#include "qemu/osdep.h"
#include <poll.h>
#include "qemu-common.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
+#include "qapi/error.h"
#include "block/block_int.h"
#include "trace.h"
#include "qemu/iov.h"
#include "qemu/uri.h"
+#include "qemu/cutils.h"
#include "sysemu/sysemu.h"
#include <nfsc/libnfs.h>
+#define QEMU_NFS_MAX_READAHEAD_SIZE 1048576
+#define QEMU_NFS_MAX_PAGECACHE_SIZE (8388608 / NFS_BLKSIZE)
+#define QEMU_NFS_MAX_DEBUG_LEVEL 2
+
typedef struct NFSClient {
struct nfs_context *context;
struct nfsfh *fh;
int events;
bool has_zero_init;
+ AioContext *aio_context;
+ blkcnt_t st_blocks;
+ bool cache_used;
} NFSClient;
typedef struct NFSRPC {
struct stat *st;
Coroutine *co;
QEMUBH *bh;
+ NFSClient *client;
} NFSRPC;
static void nfs_process_read(void *arg);
{
int ev = nfs_which_events(client->context);
if (ev != client->events) {
- qemu_aio_set_fd_handler(nfs_get_fd(client->context),
- (ev & POLLIN) ? nfs_process_read : NULL,
- (ev & POLLOUT) ? nfs_process_write : NULL,
- client);
+ aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
+ false,
+ (ev & POLLIN) ? nfs_process_read : NULL,
+ (ev & POLLOUT) ? nfs_process_write : NULL, client);
}
client->events = ev;
static void nfs_co_init_task(NFSClient *client, NFSRPC *task)
{
*task = (NFSRPC) {
- .co = qemu_coroutine_self(),
+ .co = qemu_coroutine_self(),
+ .client = client,
};
}
static void nfs_co_generic_bh_cb(void *opaque)
{
NFSRPC *task = opaque;
+ task->complete = 1;
qemu_bh_delete(task->bh);
qemu_coroutine_enter(task->co, NULL);
}
void *private_data)
{
NFSRPC *task = private_data;
- task->complete = 1;
task->ret = ret;
if (task->ret > 0 && task->iov) {
if (task->ret <= task->iov->size) {
error_report("NFS Error: %s", nfs_get_error(nfs));
}
if (task->co) {
- task->bh = qemu_bh_new(nfs_co_generic_bh_cb, task);
+ task->bh = aio_bh_new(task->client->aio_context,
+ nfs_co_generic_bh_cb, task);
qemu_bh_schedule(task->bh);
+ } else {
+ task->complete = 1;
}
}
nfs_co_init_task(client, &task);
- buf = g_malloc(nb_sectors * BDRV_SECTOR_SIZE);
+ buf = g_try_malloc(nb_sectors * BDRV_SECTOR_SIZE);
+ if (nb_sectors && buf == NULL) {
+ return -ENOMEM;
+ }
+
qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
if (nfs_pwrite_async(client->context, client->fh,
},
};
+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);
+ 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);
}
- qemu_aio_set_fd_handler(nfs_get_fd(client->context), NULL, NULL, NULL);
+ aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
+ false, NULL, NULL, NULL);
nfs_destroy_context(client->context);
}
memset(client, 0, sizeof(NFSClient));
}
static int64_t nfs_client_open(NFSClient *client, const char *filename,
- int flags, Error **errp)
+ int flags, Error **errp, int open_flags)
{
int ret = -EINVAL, i;
struct stat st;
qp = query_params_parse(uri->query);
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 fail;
}
- if (!strncmp(qp->p[i].name, "uid", 3)) {
- nfs_set_uid(client->context, atoi(qp->p[i].value));
- } else if (!strncmp(qp->p[i].name, "gid", 3)) {
- nfs_set_gid(client->context, atoi(qp->p[i].value));
- } else if (!strncmp(qp->p[i].name, "tcp-syncnt", 10)) {
- nfs_set_tcp_syncnt(client->context, atoi(qp->p[i].value));
+ if (parse_uint_full(qp->p[i].value, &val, 0)) {
+ error_setg(errp, "Illegal value for NFS parameter: %s",
+ qp->p[i].name);
+ goto fail;
+ }
+ if (!strcmp(qp->p[i].name, "uid")) {
+ nfs_set_uid(client->context, val);
+ } else if (!strcmp(qp->p[i].name, "gid")) {
+ nfs_set_gid(client->context, val);
+ } else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
+ nfs_set_tcp_syncnt(client->context, val);
+#ifdef LIBNFS_FEATURE_READAHEAD
+ } else if (!strcmp(qp->p[i].name, "readahead")) {
+ if (open_flags & BDRV_O_NOCACHE) {
+ error_setg(errp, "Cannot enable NFS readahead "
+ "if cache.direct = on");
+ goto fail;
+ }
+ if (val > QEMU_NFS_MAX_READAHEAD_SIZE) {
+ error_report("NFS Warning: Truncating NFS readahead"
+ " size to %d", QEMU_NFS_MAX_READAHEAD_SIZE);
+ val = QEMU_NFS_MAX_READAHEAD_SIZE;
+ }
+ nfs_set_readahead(client->context, val);
+#ifdef LIBNFS_FEATURE_PAGECACHE
+ nfs_set_pagecache_ttl(client->context, 0);
+#endif
+ client->cache_used = true;
+#endif
+#ifdef LIBNFS_FEATURE_PAGECACHE
+ nfs_set_pagecache_ttl(client->context, 0);
+ } else if (!strcmp(qp->p[i].name, "pagecache")) {
+ if (open_flags & BDRV_O_NOCACHE) {
+ error_setg(errp, "Cannot enable NFS pagecache "
+ "if cache.direct = on");
+ goto fail;
+ }
+ if (val > QEMU_NFS_MAX_PAGECACHE_SIZE) {
+ error_report("NFS Warning: Truncating NFS pagecache"
+ " size to %d pages", QEMU_NFS_MAX_PAGECACHE_SIZE);
+ val = QEMU_NFS_MAX_PAGECACHE_SIZE;
+ }
+ nfs_set_pagecache(client->context, val);
+ nfs_set_pagecache_ttl(client->context, 0);
+ client->cache_used = true;
+#endif
+#ifdef LIBNFS_FEATURE_DEBUG
+ } else if (!strcmp(qp->p[i].name, "debug")) {
+ /* limit the maximum debug level to avoid potential flooding
+ * of our log files. */
+ if (val > QEMU_NFS_MAX_DEBUG_LEVEL) {
+ error_report("NFS Warning: Limiting NFS debug level"
+ " to %d", QEMU_NFS_MAX_DEBUG_LEVEL);
+ val = QEMU_NFS_MAX_DEBUG_LEVEL;
+ }
+ nfs_set_debug(client->context, val);
+#endif
} else {
error_setg(errp, "Unknown NFS parameter name: %s",
qp->p[i].name);
}
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);
goto out;
fail:
QemuOpts *opts;
Error *local_err = NULL;
+ client->aio_context = bdrv_get_aio_context(bs);
+
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);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
ret = nfs_client_open(client, qemu_opt_get(opts, "filename"),
(flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
- errp);
+ errp, bs->open_flags);
if (ret < 0) {
- return ret;
+ goto out;
}
bs->total_sectors = ret;
- return 0;
+ ret = 0;
+out:
+ qemu_opts_del(opts);
+ return ret;
}
-static int nfs_file_create(const char *url, QEMUOptionParameter *options,
- Error **errp)
+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_create(const char *url, QemuOpts *opts, Error **errp)
{
int ret = 0;
int64_t total_size = 0;
- NFSClient *client = g_malloc0(sizeof(NFSClient));
+ NFSClient *client = g_new0(NFSClient, 1);
+
+ client->aio_context = qemu_get_aio_context();
/* Read out options */
- while (options && options->name) {
- if (!strcmp(options->name, "size")) {
- total_size = options->value.n;
- }
- options++;
- }
+ total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
+ BDRV_SECTOR_SIZE);
- ret = nfs_client_open(client, url, O_CREAT, errp);
+ ret = nfs_client_open(client, url, O_CREAT, errp, 0);
if (ret < 0) {
goto out;
}
NFSRPC task = {0};
struct stat st;
+ if (bdrv_is_read_only(bs) &&
+ !(bs->open_flags & BDRV_O_NOCACHE)) {
+ return client->st_blocks * 512;
+ }
+
task.st = &st;
if (nfs_fstat_async(client->context, client->fh, nfs_co_generic_cb,
&task) != 0) {
while (!task.complete) {
nfs_set_events(client);
- qemu_aio_wait();
+ aio_poll(client->aio_context, true);
}
- return (task.ret < 0 ? task.ret : st.st_blocks * st.st_blksize);
+ return (task.ret < 0 ? task.ret : st.st_blocks * 512);
}
static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
return nfs_ftruncate(client->context, client->fh, offset);
}
+/* 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;
+}
+
+#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_needs_filename = true,
- .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_create = nfs_file_create,
-
- .bdrv_co_readv = nfs_co_readv,
- .bdrv_co_writev = nfs_co_writev,
- .bdrv_co_flush_to_disk = nfs_co_flush,
+ .format_name = "nfs",
+ .protocol_name = "nfs",
+
+ .instance_size = sizeof(NFSClient),
+ .bdrv_needs_filename = true,
+ .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_create = nfs_file_create,
+ .bdrv_reopen_prepare = nfs_reopen_prepare,
+
+ .bdrv_co_readv = nfs_co_readv,
+ .bdrv_co_writev = nfs_co_writev,
+ .bdrv_co_flush_to_disk = nfs_co_flush,
+
+ .bdrv_detach_aio_context = nfs_detach_aio_context,
+ .bdrv_attach_aio_context = nfs_attach_aio_context,
+
+#ifdef LIBNFS_FEATURE_PAGECACHE
+ .bdrv_invalidate_cache = nfs_invalidate_cache,
+#endif
};
static void nfs_block_init(void)
projects / qemu.git / blobdiff