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/*
* 9p
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Gautham R Shenoy <ego@in.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-fsdev.h"
#include "qemu/queue.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
/*
* A table to store the various file systems and their callback operations.
* -----------------
* fstype | ops
* -----------------
* local | local_ops
* . |
* . |
* . |
* . |
* -----------------
* etc
*/
typedef struct FsDriverTable {
const char *name;
FileOperations *ops;
const char **opts;
} FsDriverTable;
typedef struct FsDriverListEntry {
FsDriverEntry fse;
QTAILQ_ENTRY(FsDriverListEntry) next;
} FsDriverListEntry;
static QTAILQ_HEAD(, FsDriverListEntry) fsdriver_entries =
QTAILQ_HEAD_INITIALIZER(fsdriver_entries);
#define COMMON_FS_DRIVER_OPTIONS "id", "fsdriver", "readonly"
static FsDriverTable FsDrivers[] = {
{
.name = "local",
.ops = &local_ops,
.opts = (const char * []) {
COMMON_FS_DRIVER_OPTIONS,
"security_model",
"path",
"writeout",
"fmode",
"dmode",
"multidevs",
"throttling.bps-total",
"throttling.bps-read",
"throttling.bps-write",
"throttling.iops-total",
"throttling.iops-read",
"throttling.iops-write",
"throttling.bps-total-max",
"throttling.bps-read-max",
"throttling.bps-write-max",
"throttling.iops-total-max",
"throttling.iops-read-max",
"throttling.iops-write-max",
"throttling.bps-total-max-length",
"throttling.bps-read-max-length",
"throttling.bps-write-max-length",
"throttling.iops-total-max-length",
"throttling.iops-read-max-length",
"throttling.iops-write-max-length",
"throttling.iops-size",
NULL
},
},
{
.name = "synth",
.ops = &synth_ops,
.opts = (const char * []) {
COMMON_FS_DRIVER_OPTIONS,
NULL
},
},
{
.name = "proxy",
.ops = &proxy_ops,
.opts = (const char * []) {
COMMON_FS_DRIVER_OPTIONS,
"socket",
"sock_fd",
"writeout",
NULL
},
},
};
static int validate_opt(void *opaque, const char *name, const char *value,
Error **errp)
{
FsDriverTable *drv = opaque;
const char **opt;
for (opt = drv->opts; *opt; opt++) {
if (!strcmp(*opt, name)) {
return 0;
}
}
error_setg(errp, "'%s' is invalid for fsdriver '%s'", name, drv->name);
return -1;
}
int qemu_fsdev_add(QemuOpts *opts, Error **errp)
{
int i;
struct FsDriverListEntry *fsle;
const char *fsdev_id = qemu_opts_id(opts);
const char *fsdriver = qemu_opt_get(opts, "fsdriver");
const char *writeout = qemu_opt_get(opts, "writeout");
bool ro = qemu_opt_get_bool(opts, "readonly", 0);
if (!fsdev_id) {
error_setg(errp, "fsdev: No id specified");
return -1;
}
if (fsdriver) {
if (strncmp(fsdriver, "proxy", 5) == 0) {
warn_report(
"'-fsdev proxy' and '-virtfs proxy' are deprecated, use "
"'local' instead of 'proxy, or consider deploying virtiofsd "
"as alternative to 9p"
);
}
for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
break;
}
}
if (i == ARRAY_SIZE(FsDrivers)) {
error_setg(errp, "fsdev: fsdriver %s not found", fsdriver);
return -1;
}
} else {
error_setg(errp, "fsdev: No fsdriver specified");
return -1;
}
if (qemu_opt_foreach(opts, validate_opt, &FsDrivers[i], errp)) {
return -1;
}
fsle = g_malloc0(sizeof(*fsle));
fsle->fse.fsdev_id = g_strdup(fsdev_id);
fsle->fse.ops = FsDrivers[i].ops;
if (writeout) {
if (!strcmp(writeout, "immediate")) {
fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
}
}
if (ro) {
fsle->fse.export_flags |= V9FS_RDONLY;
} else {
fsle->fse.export_flags &= ~V9FS_RDONLY;
}
if (fsle->fse.ops->parse_opts) {
if (fsle->fse.ops->parse_opts(opts, &fsle->fse, errp)) {
g_free(fsle->fse.fsdev_id);
g_free(fsle);
return -1;
}
}
QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
return 0;
}
FsDriverEntry *get_fsdev_fsentry(char *id)
{
if (id) {
struct FsDriverListEntry *fsle;
QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
if (strcmp(fsle->fse.fsdev_id, id) == 0) {
return &fsle->fse;
}
}
}
return NULL;
}
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