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Fixed the truncation bug of stat file for cache file

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This commit is contained in:
Takeshi Nakatani 2020-04-14 14:43:41 +00:00
parent 538fbed302
commit 811ea0cb85
1 changed files with 36 additions and 5 deletions
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41
src/fdcache.cpp
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@ -62,6 +62,33 @@ static const int MAX_MULTIPART_CNT = 10 * 1000; // S3 multipart max count
#define TMPFILE_DIR_0PATH "/tmp"
#endif
//------------------------------------------------
// Local utility function
//------------------------------------------------
// Wrapped s3fs_strtoofft()
//
// PageList::Serialize method uses s3fs_strtoofft function,
// but s3fs_strtoofft throws an exception, so wrap it in
// this function.
// PageList::Serialize works as 0 when the read data is invalid.
//
static off_t wrap_strtoofft(const char* str)
{
off_t result;
if(str){
try{
result = s3fs_strtoofft(str);
}catch(std::exception &e){
S3FS_PRN_WARN("something error is occurred in convert string to off_t, so return 0 as default.");
result = 0;
}
}else{
S3FS_PRN_WARN("parameter is null, so return 0 as default.");
result = 0;
}
return result;
}
//------------------------------------------------
// CacheFileStat class methods
//------------------------------------------------
@ -842,6 +869,10 @@ bool PageList::Serialize(CacheFileStat& file, bool is_output)
ssall << "\n" << iter->offset << ":" << iter->bytes << ":" << (iter->loaded ? "1" : "0") << ":" << (iter->modified ? "1" : "0");
}
if(-1 == ftruncate(file.GetFd(), 0)){
S3FS_PRN_ERR("failed to truncate file(to 0) for stats(%d)", errno);
return false;
}
string strall = ssall.str();
if(0 >= pwrite(file.GetFd(), strall.c_str(), strall.length(), 0)){
S3FS_PRN_ERR("failed to write stats(%d)", errno);
@ -883,7 +914,7 @@ bool PageList::Serialize(CacheFileStat& file, bool is_output)
delete[] ptmp;
return false;
}
off_t total = s3fs_strtoofft(oneline.c_str());
off_t total = wrap_strtoofft(oneline.c_str());
// load each part
bool is_err = false;
@ -895,24 +926,24 @@ bool PageList::Serialize(CacheFileStat& file, bool is_output)
is_err = true;
break;
}
off_t offset = s3fs_strtoofft(part.c_str());
off_t offset = wrap_strtoofft(part.c_str());
// size
if(!getline(ssparts, part, ':')){
is_err = true;
break;
}
off_t size = s3fs_strtoofft(part.c_str());
off_t size = wrap_strtoofft(part.c_str());
// loaded
if(!getline(ssparts, part, ':')){
is_err = true;
break;
}
bool is_loaded = (1 == s3fs_strtoofft(part.c_str()) ? true : false);
bool is_loaded = (1 == wrap_strtoofft(part.c_str()) ? true : false);
bool is_modified;
if(!getline(ssparts, part, ':')){
is_modified = false; // old version does not have this part.
}else{
is_modified = (1 == s3fs_strtoofft(part.c_str()) ? true : false);
is_modified = (1 == wrap_strtoofft(part.c_str()) ? true : false);
}
// add new area
PageList::page_status pstatus =