mirror of https://github.com/trapexit/mergerfs.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
2.4 KiB
124 lines
2.4 KiB
/*
|
|
ISC License
|
|
|
|
Copyright (c) 2022, Antonio SJ Musumeci <trapexit@spawn.link>
|
|
Permission to use, copy, modify, and/or distribute this software for any
|
|
purpose with or without fee is hereby granted, provided that the above
|
|
copyright notice and this permission notice appear in all copies.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include "fuse_msgbuf.hpp"
|
|
#include "fuse.h"
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <cstdint>
|
|
#include <cstdlib>
|
|
#include <mutex>
|
|
#include <stack>
|
|
|
|
|
|
static std::uint32_t g_PAGESIZE = 0;
|
|
static std::uint32_t g_BUFSIZE = 0;
|
|
|
|
static std::mutex g_MUTEX;
|
|
static std::stack<fuse_msgbuf_t*> g_MSGBUF_STACK;
|
|
|
|
static
|
|
__attribute__((constructor))
|
|
void
|
|
msgbuf_constructor()
|
|
{
|
|
g_PAGESIZE = sysconf(_SC_PAGESIZE);
|
|
g_BUFSIZE = (g_PAGESIZE * (FUSE_MAX_MAX_PAGES + 2));
|
|
}
|
|
|
|
static
|
|
__attribute__((destructor))
|
|
void
|
|
msgbuf_destroy()
|
|
{
|
|
// TODO: cleanup?
|
|
}
|
|
|
|
uint32_t
|
|
msgbuf_get_bufsize()
|
|
{
|
|
return g_BUFSIZE;
|
|
}
|
|
|
|
void
|
|
msgbuf_set_bufsize(const uint32_t size_in_pages_)
|
|
{
|
|
g_BUFSIZE = (size_in_pages_ * g_PAGESIZE);
|
|
}
|
|
|
|
static
|
|
void*
|
|
page_aligned_malloc(const uint64_t size_)
|
|
{
|
|
int rv;
|
|
void *buf = NULL;
|
|
|
|
rv = posix_memalign(&buf,g_PAGESIZE,size_);
|
|
if(rv != 0)
|
|
return NULL;
|
|
|
|
return buf;
|
|
}
|
|
|
|
fuse_msgbuf_t*
|
|
msgbuf_alloc()
|
|
{
|
|
fuse_msgbuf_t *msgbuf;
|
|
|
|
g_MUTEX.lock();
|
|
if(g_MSGBUF_STACK.empty())
|
|
{
|
|
g_MUTEX.unlock();
|
|
|
|
msgbuf = (fuse_msgbuf_t*)malloc(sizeof(fuse_msgbuf_t));
|
|
if(msgbuf == NULL)
|
|
return NULL;
|
|
|
|
msgbuf->mem = (char*)page_aligned_malloc(g_BUFSIZE);
|
|
if(msgbuf->mem == NULL)
|
|
{
|
|
free(msgbuf);
|
|
return NULL;
|
|
}
|
|
|
|
msgbuf->size = g_BUFSIZE;
|
|
}
|
|
else
|
|
{
|
|
msgbuf = g_MSGBUF_STACK.top();
|
|
g_MSGBUF_STACK.pop();
|
|
g_MUTEX.unlock();
|
|
}
|
|
|
|
return msgbuf;
|
|
}
|
|
|
|
void
|
|
msgbuf_free(fuse_msgbuf_t *msgbuf_)
|
|
{
|
|
std::lock_guard<std::mutex> lck(g_MUTEX);
|
|
|
|
if(msgbuf_->size != g_BUFSIZE)
|
|
{
|
|
free(msgbuf_->mem);
|
|
free(msgbuf_);
|
|
return;
|
|
}
|
|
|
|
g_MSGBUF_STACK.push(msgbuf_);
|
|
}
|