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new features: follow-symlinks, rename-exdev, link-exdev

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* follow-symlinks: allows mergerfs to transparently follow symlinks
* link-exdev: in the event a link returns EXDEV create a symlink instead
* rename-exdev: in the event a rename returns EXDEV move the oldpath and
  create a symlink for the newpath
This commit is contained in:
Antonio SJ Musumeci 2020-06-21 14:45:14 -04:00
parent 50daf84ec0
commit 8adebc9489
26 changed files with 6980 additions and 450 deletions
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50
src/fuse_symlink.cpp
View file

@ -16,9 +16,10 @@
#include "config.hpp"
#include "errno.hpp"
#include "fs_symlink.hpp"
#include "fs_clonepath.hpp"
#include "fs_path.hpp"
#include "fs_symlink.hpp"
#include "fuse_getattr.hpp"
#include "ugid.hpp"
#include "fuse.h"
@ -56,16 +57,16 @@ namespace l
static
int
symlink_loop_core(const string &newbasepath_,
const char *oldpath_,
const char *newpath_,
const char *target_,
const char *linkpath_,
const int error_)
{
int rv;
string fullnewpath;
fullnewpath = fs::path::make(newbasepath_,newpath_);
fullnewpath = fs::path::make(newbasepath_,linkpath_);
rv = fs::symlink(oldpath_,fullnewpath);
rv = fs::symlink(target_,fullnewpath);
return error::calc(rv,error_,errno);
}
@ -74,8 +75,8 @@ namespace l
int
symlink_loop(const string &existingpath_,
const StrVec &newbasepaths_,
const char *oldpath_,
const char *newpath_,
const char *target_,
const char *linkpath_,
const string &newdirpath_)
{
int rv;
@ -89,8 +90,8 @@ namespace l
error = error::calc(rv,error,errno);
else
error = l::symlink_loop_core(newbasepaths_[i],
oldpath_,
newpath_,
target_,
linkpath_,
error);
}
@ -102,15 +103,15 @@ namespace l
symlink(const Policy::Search &searchFunc_,
const Policy::Create &createFunc_,
const Branches &branches_,
const char *oldpath_,
const char *newpath_)
const char *target_,
const char *linkpath_)
{
int rv;
string newdirpath;
StrVec newbasepaths;
StrVec existingpaths;
newdirpath = fs::path::dirname(newpath_);
newdirpath = fs::path::dirname(linkpath_);
rv = searchFunc_(branches_,newdirpath,&existingpaths);
if(rv == -1)
@ -121,15 +122,15 @@ namespace l
return -errno;
return l::symlink_loop(existingpaths[0],newbasepaths,
oldpath_,newpath_,newdirpath);
target_,linkpath_,newdirpath);
}
}
namespace FUSE
{
int
symlink(const char *oldpath_,
const char *newpath_)
symlink(const char *target_,
const char *linkpath_)
{
Config::Read cfg;
const fuse_context *fc = fuse_get_context();
@ -138,7 +139,22 @@ namespace FUSE
return l::symlink(cfg->func.getattr.policy,
cfg->func.symlink.policy,
cfg->branches,
oldpath_,
newpath_);
target_,
linkpath_);
}
int
symlink(const char *target_,
const char *linkpath_,
struct stat *st_,
fuse_timeouts_t *timeout_)
{
int rv;
rv = FUSE::symlink(target_,linkpath_);
if(rv < 0)
return rv;
return FUSE::getattr(target_,st_,timeout_);
}
}