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/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU LGPL.
See the file COPYING.LIB.
*/
#include "fuse_i.h"
#include "fuse_lowlevel.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <assert.h>
static pthread_key_t context_key;
static pthread_mutex_t context_lock = PTHREAD_MUTEX_INITIALIZER;
static int context_ref;
static struct fuse_context *mt_getcontext(void)
{
struct fuse_context *ctx;
ctx = (struct fuse_context *) pthread_getspecific(context_key);
if (ctx == NULL) {
ctx = (struct fuse_context *) malloc(sizeof(struct fuse_context));
if (ctx == NULL) {
fprintf(stderr, "fuse: failed to allocate thread specific data\n");
return NULL;
}
pthread_setspecific(context_key, ctx);
}
return ctx;
}
static void mt_freecontext(void *data)
{
free(data);
}
static int mt_create_context_key(void)
{
int err = 0;
pthread_mutex_lock(&context_lock);
if (!context_ref) {
err = pthread_key_create(&context_key, mt_freecontext);
if (err)
fprintf(stderr, "fuse: failed to create thread specific key: %s\n",
strerror(err));
else
fuse_set_getcontext_func(mt_getcontext);
}
if (!err)
context_ref ++;
pthread_mutex_unlock(&context_lock);
return err;
}
static void mt_delete_context_key(void)
{
pthread_mutex_lock(&context_lock);
context_ref--;
if (!context_ref) {
fuse_set_getcontext_func(NULL);
pthread_key_delete(context_key);
}
pthread_mutex_unlock(&context_lock);
}
struct procdata {
struct fuse *f;
struct fuse_chan *prevch;
struct fuse_session *prevse;
fuse_processor_t proc;
void *data;
};
static void mt_session_proc(void *data, const char *buf, size_t len,
struct fuse_chan *ch)
{
struct procdata *pd = (struct procdata *) data;
struct fuse_cmd *cmd = *(struct fuse_cmd **) buf;
(void) len;
cmd->ch = ch;
pd->proc(pd->f, cmd, pd->data);
}
static void mt_session_exit(void *data, int val)
{
struct procdata *pd = (struct procdata *) data;
if (val)
fuse_session_exit(pd->prevse);
else
fuse_session_reset(pd->prevse);
}
static int mt_session_exited(void *data)
{
struct procdata *pd = (struct procdata *) data;
return fuse_session_exited(pd->prevse);
}
static int mt_chan_receive(struct fuse_chan *ch, char *buf, size_t size)
{
struct fuse_cmd *cmd;
struct procdata *pd = (struct procdata *) fuse_chan_data(ch);
assert(size >= sizeof(cmd));
cmd = fuse_read_cmd(pd->f);
if (cmd == NULL)
return 0;
*(struct fuse_cmd **) buf = cmd;
return sizeof(cmd);
}
static int mt_chan_send(struct fuse_chan *ch, const struct iovec iov[],
size_t count)
{
struct procdata *pd = (struct procdata *) fuse_chan_data(ch);
return fuse_chan_send(pd->prevch, iov, count);
}
int fuse_loop_mt_proc(struct fuse *f, fuse_processor_t proc, void *data)
{
int res;
struct procdata pd;
struct fuse_session *prevse = fuse_get_session(f);
struct fuse_session *se;
struct fuse_chan *prevch = fuse_session_next_chan(prevse, NULL);
struct fuse_chan *ch;
struct fuse_session_ops sop = {
.exit = mt_session_exit,
.exited = mt_session_exited,
.process = mt_session_proc,
};
struct fuse_chan_ops cop = {
.receive = mt_chan_receive,
.send = mt_chan_send,
};
pd.f = f;
pd.prevch = prevch;
pd.prevse = prevse;
pd.proc = proc;
pd.data = data;
se = fuse_session_new(&sop, &pd);
if (se == NULL)
return -1;
ch = fuse_chan_new(&cop, fuse_chan_fd(prevch), sizeof(struct fuse_cmd *),
&pd);
if (ch == NULL) {
fuse_session_destroy(se);
return -1;
}
fuse_session_add_chan(se, ch);
if (mt_create_context_key() != 0) {
fuse_session_destroy(se);
return -1;
}
res = fuse_session_loop_mt(se);
mt_delete_context_key();
fuse_session_destroy(se);
return res;
}
int fuse_loop_mt(struct fuse *f)
{
int res;
if (f == NULL)
return -1;
if (mt_create_context_key() != 0)
return -1;
res = fuse_session_loop_mt(fuse_get_session(f));
mt_delete_context_key();
return res;
}
__asm__(".symver fuse_loop_mt_proc,__fuse_loop_mt@");
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