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https://github.com/trapexit/mergerfs.git
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84592a9f13
After numerous tests it was found the splice features were at best the same performance as standard IO and at worse actually slower. To simplify the code all splice features are removed.
125 lines
2.4 KiB
C++
125 lines
2.4 KiB
C++
/*
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ISC License
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Copyright (c) 2022, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "fuse_msgbuf.hpp"
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#include "fuse.h"
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#include <unistd.h>
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#include <cstdint>
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#include <cstdlib>
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#include <mutex>
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#include <stack>
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static std::uint32_t g_PAGESIZE = 0;
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static std::uint32_t g_BUFSIZE = 0;
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static std::mutex g_MUTEX;
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static std::stack<fuse_msgbuf_t*> g_MSGBUF_STACK;
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static
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__attribute__((constructor))
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void
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msgbuf_constructor()
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{
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g_PAGESIZE = sysconf(_SC_PAGESIZE);
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g_BUFSIZE = (g_PAGESIZE * (FUSE_MAX_MAX_PAGES + 2));
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}
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static
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__attribute__((destructor))
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void
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msgbuf_destroy()
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{
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// TODO: cleanup?
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}
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uint32_t
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msgbuf_get_bufsize()
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{
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return g_BUFSIZE;
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}
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void
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msgbuf_set_bufsize(const uint32_t size_in_pages_)
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{
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g_BUFSIZE = (size_in_pages_ * g_PAGESIZE);
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}
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static
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void*
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page_aligned_malloc(const uint64_t size_)
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{
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int rv;
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void *buf = NULL;
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rv = posix_memalign(&buf,g_PAGESIZE,size_);
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if(rv != 0)
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return NULL;
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return buf;
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}
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fuse_msgbuf_t*
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msgbuf_alloc()
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{
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fuse_msgbuf_t *msgbuf;
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g_MUTEX.lock();
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if(g_MSGBUF_STACK.empty())
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{
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g_MUTEX.unlock();
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msgbuf = (fuse_msgbuf_t*)malloc(sizeof(fuse_msgbuf_t));
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if(msgbuf == NULL)
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return NULL;
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msgbuf->mem = (char*)page_aligned_malloc(g_BUFSIZE);
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if(msgbuf->mem == NULL)
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{
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free(msgbuf);
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return NULL;
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}
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msgbuf->size = g_BUFSIZE;
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}
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else
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{
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msgbuf = g_MSGBUF_STACK.top();
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g_MSGBUF_STACK.pop();
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g_MUTEX.unlock();
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}
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return msgbuf;
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}
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void
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msgbuf_free(fuse_msgbuf_t *msgbuf_)
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{
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std::lock_guard<std::mutex> lck(g_MUTEX);
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if(msgbuf_->size != g_BUFSIZE)
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{
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free(msgbuf_->mem);
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free(msgbuf_);
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return;
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}
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g_MSGBUF_STACK.push(msgbuf_);
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}
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