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support setting of inodes (using use_ino option)

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creates a 64bit inode value from the underlying device value + original inode

final_ino = orig_ino | (dev << 32)

not perfect but given few filesystems use 64bit inodes nor is st_dev more than 16bit usually it should be fine
This commit is contained in:
Antonio SJ Musumeci 2016-12-11 18:27:52 -05:00
parent 365e153ae7
commit c8fa51c81a
6 changed files with 101 additions and 25 deletions
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39
src/getattr.cpp
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@ -22,6 +22,7 @@
#include "config.hpp"
#include "errno.hpp"
#include "fs_base_stat.hpp"
#include "fs_inode.hpp"
#include "fs_path.hpp"
#include "rwlock.hpp"
#include "ugid.hpp"
@ -32,25 +33,25 @@ using mergerfs::Policy;
static
int
_getattr_controlfile(struct stat &buf)
_getattr_controlfile(struct stat &st)
{
static const uid_t uid = ::getuid();
static const gid_t gid = ::getgid();
static const time_t now = ::time(NULL);
buf.st_dev = 0;
buf.st_ino = 0;
buf.st_mode = (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH);
buf.st_nlink = 1;
buf.st_uid = uid;
buf.st_gid = gid;
buf.st_rdev = 0;
buf.st_size = 0;
buf.st_blksize = 1024;
buf.st_blocks = 0;
buf.st_atime = now;
buf.st_mtime = now;
buf.st_ctime = now;
st.st_dev = 0;
st.st_ino = fs::inode::MAGIC;
st.st_mode = (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH);
st.st_nlink = 1;
st.st_uid = uid;
st.st_gid = gid;
st.st_rdev = 0;
st.st_size = 0;
st.st_blksize = 512;
st.st_blocks = 0;
st.st_atime = now;
st.st_mtime = now;
st.st_ctime = now;
return 0;
}
@ -61,7 +62,7 @@ _getattr(Policy::Func::Search searchFunc,
const vector<string> &srcmounts,
const uint64_t minfreespace,
const char *fusepath,
struct stat &buf)
struct stat &st)
{
int rv;
string fullpath;
@ -73,9 +74,13 @@ _getattr(Policy::Func::Search searchFunc,
fs::path::make(basepaths[0],fusepath,fullpath);
rv = fs::lstat(fullpath,buf);
rv = fs::lstat(fullpath,st);
if(rv == -1)
return -errno;
return ((rv == -1) ? -errno : 0);
fs::inode::recompute(st);
return 0;
}
namespace mergerfs