2015-09-16 06:49:18 +08:00
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/*
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2016-01-15 05:50:22 +08:00
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Copyright (c) 2016, 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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2015-09-16 06:49:18 +08:00
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#ifdef __linux__
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#include <sys/sendfile.h>
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#endif
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#include <string>
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#include <vector>
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#include "fs_attr.hpp"
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#include "fs_xattr.hpp"
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using std::string;
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using std::vector;
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namespace fs
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{
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static
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ssize_t
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sendfile(const int fdin,
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const int fdout,
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const size_t count)
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{
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#if defined __linux__
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off_t offset = 0;
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return ::sendfile(fdout,fdin,&offset,count);
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#else
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return (errno=EINVAL,-1);
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#endif
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}
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int
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writen(const int fd,
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const char *buf,
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const size_t count)
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{
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size_t nleft;
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ssize_t nwritten;
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nleft = count;
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while(nleft > 0)
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{
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nwritten = ::write(fd,buf,nleft);
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if(nwritten == -1)
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{
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if(errno == EINTR)
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continue;
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return -1;
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}
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nleft -= nwritten;
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buf += nwritten;
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}
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return count;
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}
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static
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int
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copyfile_rw(const int fdin,
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const int fdout,
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const size_t count,
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const size_t blocksize)
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{
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ssize_t nr;
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ssize_t nw;
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ssize_t bufsize;
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size_t totalwritten;
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vector<char> buf;
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bufsize = (blocksize * 16);
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buf.resize(bufsize);
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totalwritten = 0;
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while(totalwritten < count)
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{
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nr = ::read(fdin,&buf[0],bufsize);
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if(nr == -1)
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{
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if(errno == EINTR)
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continue;
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else
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return -1;
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}
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nw = writen(fdout,&buf[0],nr);
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if(nw == -1)
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return -1;
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totalwritten += nw;
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}
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return count;
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}
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static
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int
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copydata(const int fdin,
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const int fdout,
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const size_t count,
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const size_t blocksize)
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{
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int rv;
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::posix_fadvise(fdin,0,count,POSIX_FADV_WILLNEED);
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::posix_fadvise(fdin,0,count,POSIX_FADV_SEQUENTIAL);
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::posix_fallocate(fdout,0,count);
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rv = fs::sendfile(fdin,fdout,count);
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if((rv == -1) && ((errno == EINVAL) || (errno == ENOSYS)))
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return fs::copyfile_rw(fdin,fdout,count,blocksize);
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return rv;
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}
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static
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bool
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ignorable_error(const int err)
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{
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switch(err)
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{
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case ENOTTY:
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case ENOTSUP:
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#if ENOTSUP != EOPNOTSUPP
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case EOPNOTSUPP:
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#endif
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return true;
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}
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return false;
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}
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int
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clonefile(const int fdin,
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const int fdout)
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{
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int rv;
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struct stat stin;
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rv = ::fstat(fdin,&stin);
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if(rv == -1)
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return -1;
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rv = copydata(fdin,fdout,stin.st_size,stin.st_blksize);
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if(rv == -1)
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return -1;
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rv = fs::attr::copy(fdin,fdout);
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if(rv == -1 && !ignorable_error(errno))
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return -1;
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rv = fs::xattr::copy(fdin,fdout);
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if(rv == -1 && !ignorable_error(errno))
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return -1;
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rv = ::fchown(fdout,stin.st_uid,stin.st_gid);
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if(rv == -1)
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return -1;
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rv = ::fchmod(fdout,stin.st_mode);
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if(rv == -1)
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return -1;
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struct timespec times[2];
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times[0] = stin.st_atim;
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times[1] = stin.st_mtim;
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rv = ::futimens(fdout,times);
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if(rv == -1)
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return -1;
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return 0;
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}
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int
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clonefile(const string &in,
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const string &out)
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{
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int rv;
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int fdin;
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int fdout;
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int error;
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fdin = ::open(in.c_str(),O_RDONLY|O_NOFOLLOW);
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if(fdin == -1)
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return -1;
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const int flags = O_CREAT|O_LARGEFILE|O_NOATIME|O_NOFOLLOW|O_TRUNC|O_WRONLY;
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const int mode = S_IWUSR;
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fdout = ::open(out.c_str(),flags,mode);
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if(fdout == -1)
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return -1;
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rv = fs::clonefile(fdin,fdout);
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error = errno;
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::close(fdin);
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::close(fdout);
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errno = error;
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return rv;
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}
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}
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