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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
Download patch file Download diff file Expand all files Collapse all files

66
src/fuse_getattr.cpp
View file

@ -19,6 +19,7 @@
#include "fs_inode.hpp"
#include "fs_lstat.hpp"
#include "fs_path.hpp"
#include "fs_stat.hpp"
#include "symlinkify.hpp"
#include "ugid.hpp"
@ -31,6 +32,42 @@ using std::string;
namespace l
{
static
void
set_stat_if_leads_to_dir(const std::string &path_,
struct stat *st_)
{
int rv;
struct stat st;
rv = fs::stat(path_,&st);
if(rv == -1)
return;
if(S_ISDIR(st.st_mode))
*st_ = st;
return;
}
static
void
set_stat_if_leads_to_reg(const std::string &path_,
struct stat *st_)
{
int rv;
struct stat st;
rv = fs::stat(path_,&st);
if(rv == -1)
return;
if(S_ISREG(st.st_mode))
*st_ = st;
return;
}
static
int
getattr_controlfile(struct stat *st_)
@ -63,7 +100,8 @@ namespace l
const char *fusepath_,
struct stat *st_,
const bool symlinkify_,
const time_t symlinkify_timeout_)
const time_t symlinkify_timeout_,
FollowSymlinks followsymlinks_)
{
int rv;
string fullpath;
@ -75,7 +113,28 @@ namespace l
fullpath = fs::path::make(basepaths[0],fusepath_);
rv = fs::lstat(fullpath,st_);
switch(followsymlinks_)
{
case FollowSymlinks::ENUM::NEVER:
rv = fs::lstat(fullpath,st_);
break;
case FollowSymlinks::ENUM::DIRECTORY:
rv = fs::lstat(fullpath,st_);
if(S_ISLNK(st_->st_mode))
l::set_stat_if_leads_to_dir(fullpath,st_);
break;
case FollowSymlinks::ENUM::REGULAR:
rv = fs::lstat(fullpath,st_);
if(S_ISLNK(st_->st_mode))
l::set_stat_if_leads_to_reg(fullpath,st_);
break;
case FollowSymlinks::ENUM::ALL:
rv = fs::stat(fullpath,st_);
if(rv != 0)
rv = fs::lstat(fullpath,st_);
break;
}
if(rv == -1)
return -errno;
@ -102,7 +161,8 @@ namespace l
fusepath_,
st_,
cfg->symlinkify,
cfg->symlinkify_timeout);
cfg->symlinkify_timeout,
cfg->follow_symlinks);
timeout_->entry = ((rv >= 0) ?
cfg->cache_entry :