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Improved use of temporary files

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This commit is contained in:
Takeshi Nakatani
2017-11-23 09:18:11 +00:00
parent 99fe93b7f1
commit 026260e7a1
1 changed files with 17 additions and 13 deletions
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30
src/fdcache.cpp
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@ -756,20 +756,24 @@ int FdEntity::OpenMirrorFile(void)
return -EIO;
}
// make mirror file path
char szfile[NAME_MAX + 1];
if(NULL == tmpnam(szfile)){
S3FS_PRN_ERR("could not get temporary file name.");
return -EIO;
}
char* ppos = strrchr(szfile, '/');
++ppos;
mirrorpath = bupdir + "/" + ppos;
// try to link mirror file
while(true){
// make random(temp) file path
// (do not care for threading, because allowed any value returned.)
//
char szfile[NAME_MAX + 1];
unsigned int seed = static_cast<unsigned int>(time(NULL));
sprintf(szfile, "%x.tmp", rand_r(&seed));
mirrorpath = bupdir + "/" + szfile;
// link mirror file to cache file
if(-1 == link(cachepath.c_str(), mirrorpath.c_str())){
S3FS_PRN_ERR("could not link mirror file(%s) to cache file(%s) by errno(%d).", mirrorpath.c_str(), cachepath.c_str(), errno);
return -errno;
// link mirror file to cache file
if(0 == link(cachepath.c_str(), mirrorpath.c_str())){
break;
}
if(EEXIST != errno){
S3FS_PRN_ERR("could not link mirror file(%s) to cache file(%s) by errno(%d).", mirrorpath.c_str(), cachepath.c_str(), errno);
return -errno;
}
}
// open mirror file