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symlinkify: file -> symlink-to-original-file after timeout

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This commit is contained in:
Antonio SJ Musumeci 2017-04-24 06:57:29 -04:00
parent 25ce9938c6
commit 6a7675f2bf
13 changed files with 290 additions and 47 deletions
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67
src/readlink.cpp
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@ -16,11 +16,15 @@
#include <fuse.h>
#include <string.h>
#include "config.hpp"
#include "errno.hpp"
#include "fs_base_readlink.hpp"
#include "fs_base_stat.hpp"
#include "fs_path.hpp"
#include "rwlock.hpp"
#include "symlinkify.hpp"
#include "ugid.hpp"
using std::string;
@ -29,15 +33,12 @@ using mergerfs::Policy;
static
int
_readlink_core(const string *basepath,
const char *fusepath,
char *buf,
const size_t size)
_readlink_core_standard(const string &fullpath,
char *buf,
const size_t size)
{
int rv;
string fullpath;
fs::path::make(basepath,fusepath,fullpath);
rv = fs::readlink(fullpath,buf,size);
if(rv == -1)
@ -48,6 +49,47 @@ _readlink_core(const string *basepath,
return 0;
}
static
int
_readlink_core_symlinkify(const string &fullpath,
char *buf,
const size_t size,
const time_t symlinkify_timeout)
{
int rv;
struct stat st;
rv = fs::stat(fullpath,st);
if(rv == -1)
return -errno;
if(!symlinkify::can_be_symlink(st,symlinkify_timeout))
return _readlink_core_standard(fullpath,buf,size);
strncpy(buf,fullpath.c_str(),size);
return 0;
}
static
int
_readlink_core(const string *basepath,
const char *fusepath,
char *buf,
const size_t size,
const bool symlinkify,
const time_t symlinkify_timeout)
{
string fullpath;
fs::path::make(basepath,fusepath,fullpath);
if(symlinkify)
return _readlink_core_symlinkify(fullpath,buf,size,symlinkify_timeout);
return _readlink_core_standard(fullpath,buf,size);
}
static
int
_readlink(Policy::Func::Search searchFunc,
@ -55,7 +97,9 @@ _readlink(Policy::Func::Search searchFunc,
const uint64_t minfreespace,
const char *fusepath,
char *buf,
const size_t size)
const size_t size,
const bool symlinkify,
const time_t symlinkify_timeout)
{
int rv;
vector<const string*> basepaths;
@ -64,7 +108,8 @@ _readlink(Policy::Func::Search searchFunc,
if(rv == -1)
return -errno;
return _readlink_core(basepaths[0],fusepath,buf,size);
return _readlink_core(basepaths[0],fusepath,buf,size,
symlinkify,symlinkify_timeout);
}
namespace mergerfs
@ -86,7 +131,9 @@ namespace mergerfs
config.minfreespace,
fusepath,
buf,
size);
size,
config.symlinkify,
config.symlinkify_timeout);
}
}
}