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Remove cache file when object time differs

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Check the modification times to determine whether an object has
updated.  This relies on low clock skew between s3fs and the S3
server; a more robust approach could use the ETag.  Fixes #1047.
This commit is contained in:
Andrew Gaul
2019-06-21 19:46:25 -07:00
parent 670dce6f4a
commit 9e5eaad79b
3 changed files with 25 additions and 1 deletions
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10
src/fdcache.cpp
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@ -842,6 +842,16 @@ int FdEntity::Open(headers_t* pmeta, ssize_t size, time_t time, bool no_fd_lock_
if(!cachepath.empty()){
// using cache
struct stat st;
if(stat(cachepath.c_str(), &st) == 0){
if(st.st_mtime < time){
S3FS_PRN_DBG("cache file stale, removing: %s", cachepath.c_str());
if(unlink(cachepath.c_str()) != 0){
return (0 == errno ? -EIO : -errno);
}
}
}
// open cache and cache stat file, load page info.
CacheFileStat cfstat(path.c_str());