mirror of
https://github.com/trapexit/mergerfs.git
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97 lines
2.6 KiB
Plaintext
97 lines
2.6 KiB
Plaintext
/*
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ISC License
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Copyright (c) 2018, 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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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#include "errno.hpp"
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#include <cstdint>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace l
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{
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static
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int64_t
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copy_file_range_(int src_fd_,
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int64_t *src_off_,
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int tgt_fd_,
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int64_t *tgt_off_,
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const uint64_t len_,
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const unsigned int flags_)
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{
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#ifdef SYS_copy_file_range
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int64_t rv;
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loff_t src_off;
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loff_t tgt_off;
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loff_t *src_off_ptr;
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loff_t *tgt_off_ptr;
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src_off = ((src_off_ == NULL) ? 0 : *src_off_);
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tgt_off = ((tgt_off_ == NULL) ? 0 : *tgt_off_);
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src_off_ptr = ((src_off_ == NULL) ? NULL : &src_off);
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tgt_off_ptr = ((tgt_off_ == NULL) ? NULL : &tgt_off);
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rv = ::syscall(SYS_copy_file_range,
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src_fd_,
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src_off_ptr,
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tgt_fd_,
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tgt_off_ptr,
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len_,
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flags_);
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if(rv != -1)
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{
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if(src_off_ != NULL)
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*src_off_ = src_off;
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if(tgt_off_ != NULL)
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*tgt_off_ = tgt_off;
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}
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return rv;
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#else
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return (errno=EOPNOTSUPP,-1);
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#endif
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}
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}
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namespace fs
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{
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int64_t
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copy_file_range(const int src_fd_,
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int64_t *src_off_,
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const int tgt_fd_,
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int64_t *tgt_off_,
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const uint64_t len_,
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const unsigned int flags_)
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{
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return l::copy_file_range_(src_fd_,
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src_off_,
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tgt_fd_,
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tgt_off_,
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len_,
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flags_);
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}
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}
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