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fusetrace_ll.cc
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// -*- mode:C++; tab-width:8; c-basic-offset:4; indent-tabs-mode:t -*-
// vim: ts=8 sw=4 smarttab
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <[email protected]>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
gcc -Wall `pkg-config fuse --cflags --libs` -lulockmgr fusexmp_fh.c -o fusexmp_fh
*/
#define FUSE_USE_VERSION 30
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <fuse/fuse_lowlevel.h>
#include <ulockmgr.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <sys/time.h>
#ifdef HAVE_SETXATTR
#include <sys/xattr.h>
#endif
#include <time.h>
#include "include/unordered_map.h"
#include "include/hash_namespace.h"
#ifndef __LP64__
CEPH_HASH_NAMESPACE_START
template<> struct hash<uint64_t> {
size_t operator()(uint64_t __x) const {
static hash<uint32_t> H;
return H((__x >> 32) ^ (__x & 0xffffffff));
}
};
CEPH_HASH_NAMESPACE_END
#endif
#include <iostream>
#include <fstream>
#include <map>
#include <set>
using namespace std;
#include "common/Mutex.h"
Mutex trace_lock;
ofstream tracefile;
#define traceout (tracefile.is_open() ? tracefile : cout)
char *basedir = 0;
int debug = 0;
bool do_timestamps = true;
#define dout if (debug) cout
Mutex lock;
struct Inode {
struct stat stbuf;
int ref;
set<int> fds;
map<pair<string,ino_t>,Inode*> parents;
// if dir,
map<string,Inode*> dentries;
Inode() : ref(0) {}
Inode *lookup(const string& dname) {
if (dentries.count(dname))
return dentries[dname];
return 0;
}
};
Inode *root = 0;
ceph::unordered_map<ino_t, Inode*> inode_map;
bool make_inode_path(string &buf, Inode *in)
{
if (!in->parents.empty()) {
if (!make_inode_path(buf, in->parents.begin()->second))
return false;
buf += "/";
buf += in->parents.begin()->first.first;
} else {
if (in != root) return false;
assert(in->stbuf.st_ino == 1);
buf = basedir;
buf += "/";
}
return true;
//dout << "path: " << in->stbuf.st_ino << " -> " << buf << endl;
}
bool make_inode_path(string &buf, Inode *in, const char *name)
{
if (!make_inode_path(buf, in)) return false;
buf += "/";
buf += name;
return true;
}
bool make_ino_path(string &buf, ino_t ino)
{
Inode *in = inode_map[ino];
assert(in);
return make_inode_path(buf, in);
}
bool make_ino_path(string &buf, ino_t ino, const char *name)
{
Inode *in = inode_map[ino];
assert(in);
if (!make_inode_path(buf, in))
return false;
buf += "/";
buf += name;
return true;
}
void remove_dentry(Inode *pin, const string& dname)
{
dout << "remove_dentry " << pin->stbuf.st_ino << " " << dname << endl;
Inode *in = pin->lookup(dname);
assert(in);
pin->dentries.erase(dname);
in->parents.erase(pair<string,ino_t>(dname,pin->stbuf.st_ino));
dout << "remove_dentry " << pin->stbuf.st_ino << " " << dname
<< " ... inode " << in->stbuf.st_ino << " ref " << in->ref
<< endl;
}
void add_dentry(Inode *parent, const string& dname, Inode *in)
{
dout << "add_dentry " << parent->stbuf.st_ino << " " << dname << " to " << in->stbuf.st_ino << endl;
if (parent->dentries.count(dname))
remove_dentry(parent, dname); // e.g., when renaming over another file..
parent->dentries[dname] = in;
in->parents[pair<string,ino_t>(dname,parent->stbuf.st_ino)] = parent;
}
void unlink_inode(Inode *in)
{
dout << "unlink_inode " << in->stbuf.st_ino << " ref " << in->ref << endl;
// remove parent links
while (!in->parents.empty()) {
Inode *parent = in->parents.begin()->second;
string dname = in->parents.begin()->first.first;
remove_dentry(parent, dname);
}
// remove children
while (!in->dentries.empty())
remove_dentry(in, in->dentries.begin()->first);
while (!in->fds.empty()) {
int fd = *in->fds.begin();
::close(fd);
in->fds.erase(in->fds.begin());
dout << "remove_inode closeing stray fd " << fd << endl;
}
}
void remove_inode(Inode *in)
{
dout << "remove_inode " << in->stbuf.st_ino << " ref " << in->ref << endl;
unlink_inode(in);
inode_map.erase(in->stbuf.st_ino);
dout << "remove_inode " << in->stbuf.st_ino << " done" << endl;
delete in;
}
Inode *add_inode(Inode *parent, const char *name, struct stat *attr)
{
dout << "add_inode " << parent->stbuf.st_ino << " " << name << " " << attr->st_ino << endl;
Inode *in;
if (inode_map.count(attr->st_ino)) {
// reuse inode
in = inode_map[attr->st_ino];
unlink_inode(in); // hrm.. should this close open fds? probably.
dout << "** REUSING INODE **" << endl;
} else {
inode_map[attr->st_ino] = in = new Inode;
}
memcpy(&in->stbuf, attr, sizeof(*attr));
string dname(name);
add_dentry(parent, dname, in);
return in;
}
void print_time()
{
if (do_timestamps) {
struct timeval tv;
gettimeofday(&tv, 0);
traceout << "@" << endl
<< tv.tv_sec << endl
<< tv.tv_usec << endl;
}
}
bool has_perm(int mask, Inode *in, int uid, int gid)
{
dout << "hash_perm " << uid << "." << gid << " " << oct << mask << " in " << in->stbuf.st_mode
<< " " << in->stbuf.st_uid << "." << in->stbuf.st_gid << endl;
if (in->stbuf.st_mode & mask) return true;
if (in->stbuf.st_gid == gid && in->stbuf.st_mode & (mask << 3)) return true;
if (in->stbuf.st_uid == uid && in->stbuf.st_mode & (mask << 6)) return true;
return false;
}
static void ft_ll_lookup(fuse_req_t req, fuse_ino_t pino, const char *name)
{
int res = 0;
//dout << "lookup " << pino << " " << name << endl;
struct fuse_entry_param fe;
memset(&fe, 0, sizeof(fe));
lock.Lock();
Inode *parent = inode_map[pino];
assert(parent);
// check permissions
string dname(name);
string path;
Inode *in = 0;
if (!has_perm(0001, parent, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)) {
res = EPERM;
}
else if (!make_inode_path(path, parent, name)) {
res = ENOENT;
} else {
in = parent->lookup(dname);
if (in && res == 0) {
// re-stat, for good measure
res = ::lstat(path.c_str(), &in->stbuf);
// hrm!
if (res != 0) {
dout << "** WEIRD ** lookup on " << pino << " " << name << " inode went away!" << endl;
in = 0;
res = errno;
}
//dout << "have " << in->stbuf.st_ino << endl;
} else {
in = new Inode;
res = ::lstat(path.c_str(), &in->stbuf);
//dout << "stat " << path << " res = " << res << endl;
if (res == 0) {
inode_map[in->stbuf.st_ino] = in;
add_dentry(parent, dname, in);
} else {
delete in;
in = 0;
res = errno;
}
}
if (in) {
in->ref++;
fe.ino = in->stbuf.st_ino;
memcpy(&fe.attr, &in->stbuf, sizeof(in->stbuf));
}
}
lock.Unlock();
trace_lock.Lock();
print_time();
traceout << "ll_lookup" << endl << pino << endl << name << endl << fe.attr.st_ino << endl;
trace_lock.Unlock();
if (in)
fuse_reply_entry(req, &fe);
else
fuse_reply_err(req, res);
}
static void ft_ll_forget(fuse_req_t req, fuse_ino_t ino, long unsigned nlookup)
{
if (ino != 1) {
lock.Lock();
Inode *in = inode_map[ino];
if (in) {
dout << "forget on " << ino << " ref " << in->ref << ", forget " << nlookup << endl;
if (in->ref < nlookup)
dout << "**** BAD **** forget on " << ino << " ref " << in->ref << ", forget " << nlookup << endl;
in->ref -= nlookup;
if (in->ref <= 0)
remove_inode(in);
} else {
dout << "**** BAD **** forget " << nlookup << " on nonexistent inode " << ino << endl;
}
lock.Unlock();
}
trace_lock.Lock();
print_time();
traceout << "ll_forget" << endl << ino << endl << nlookup << endl;
trace_lock.Unlock();
fuse_reply_none(req);
}
static void ft_ll_getattr(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
{
int res = 0;
string path;
int fd = 0;
Inode *in = 0;
struct stat attr;
lock.Lock();
in = inode_map[ino];
if (in->fds.empty()) {
if (!make_inode_path(path, in))
res = ENOENT;
} else
fd = *in->fds.begin();
lock.Unlock();
if (fd > 0) {
res = ::fstat(fd, &attr);
dout << "getattr fstat on fd " << fd << " res " << res << endl;
} else if (res == 0) {
res = ::lstat(path.c_str(), &attr);
dout << "getattr lstat on " << path << " res " << res << endl;
}
if (res < 0) res = errno;
if (ino == 1) attr.st_ino = 1;
trace_lock.Lock();
print_time();
traceout << "ll_getattr" << endl << ino << endl;
trace_lock.Unlock();
if (res == 0) {
lock.Lock();
memcpy(&in->stbuf, &attr, sizeof(attr));
lock.Unlock();
fuse_reply_attr(req, &attr, 0);
} else
fuse_reply_err(req, res);
}
static void ft_ll_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
int to_set, struct fuse_file_info *fi)
{
string path;
Inode *in = 0;
int fd = 0;
int res = 0;
lock.Lock();
in = inode_map[ino];
if (in->fds.empty() || (to_set & FUSE_SET_ATTR_MTIME)) {
if (!make_inode_path(path, in))
res = ENOENT;
} else
fd = *in->fds.begin();
lock.Unlock();
trace_lock.Lock();
print_time();
traceout << "ll_setattr" << endl << ino << endl;
traceout << attr->st_mode << endl;
traceout << attr->st_uid << endl << attr->st_gid << endl;
traceout << attr->st_size << endl;
traceout << attr->st_mtime << endl;
traceout << attr->st_atime << endl;
traceout << to_set << endl;
trace_lock.Unlock();
if (res == 0 && !has_perm(0010, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)) {
res = EPERM;
} else if (res == 0) {
if (to_set & FUSE_SET_ATTR_MODE) {
if (fd > 0)
res = ::fchmod(fd, attr->st_mode);
else
res = ::chmod(path.c_str(), attr->st_mode);
}
if (!res && to_set & FUSE_SET_ATTR_UID) {
if (fd > 0)
res = ::fchown(fd, attr->st_uid, attr->st_gid);
else
res = ::chown(path.c_str(), attr->st_uid, attr->st_gid);
}
if (!res && to_set & FUSE_SET_ATTR_SIZE) {
if (fd > 0)
res = ::ftruncate(fd, attr->st_size);
else
res = ::truncate(path.c_str(), attr->st_size);
}
if (!res && to_set & FUSE_SET_ATTR_MTIME) {
struct utimbuf ut;
ut.actime = attr->st_atime;
ut.modtime = attr->st_mtime;
res = ::utime(path.c_str(), &ut);
}
if (res < 0) res = errno;
}
if (res == 0) {
lock.Lock();
::lstat(path.c_str(), &in->stbuf);
if (ino == 1) in->stbuf.st_ino = 1;
memcpy(attr, &in->stbuf, sizeof(*attr));
lock.Unlock();
fuse_reply_attr(req, attr, 0);
} else
fuse_reply_err(req, res);
}
static void ft_ll_readlink(fuse_req_t req, fuse_ino_t ino)
{
string path;
int res = 0;
lock.Lock();
if (!make_ino_path(path, ino))
res = ENOENT;
lock.Unlock();
trace_lock.Lock();
print_time();
traceout << "ll_readlink" << endl << ino << endl;
trace_lock.Unlock();
char buf[256];
if (res == 0) res = readlink(path.c_str(), buf, 255);
if (res < 0) res = errno;
if (res >= 0) {
buf[res] = 0;
fuse_reply_readlink(req, buf);
} else {
fuse_reply_err(req, res);
}
}
static void ft_ll_opendir(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
{
string path;
int res = 0;
lock.Lock();
Inode *in = inode_map[ino];
if (!make_inode_path(path, in))
res = ENOENT;
lock.Unlock();
DIR *dir = 0;
if (res == 0 && !has_perm(0100, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) dir = opendir(path.c_str());
if (res < 0) res = errno;
trace_lock.Lock();
print_time();
traceout << "ll_opendir" << endl << ino << endl << (unsigned long)dir << endl;
trace_lock.Unlock();
if (dir) {
fi->fh = (long)dir;
fuse_reply_open(req, fi);
} else
fuse_reply_err(req, res);
}
static void ft_ll_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
struct dirent *de;
DIR *dp = (DIR*)fi->fh;
// buffer
char *buf;
size_t pos = 0;
buf = new char[size];
if (!buf) {
fuse_reply_err(req, ENOMEM);
return;
}
seekdir(dp, off);
while ((de = readdir(dp)) != NULL) {
struct stat st;
memset(&st, 0, sizeof(st));
st.st_ino = de->d_ino;
st.st_mode = de->d_type << 12;
size_t entrysize = fuse_add_direntry(req, buf + pos, size - pos,
de->d_name, &st, telldir(dp));
if (entrysize > size - pos)
break; // didn't fit, done for now.
pos += entrysize;
}
fuse_reply_buf(req, buf, pos);
delete[] buf;
}
static void ft_ll_releasedir(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
DIR *dir = (DIR*)fi->fh;
trace_lock.Lock();
print_time();
traceout << "ll_releasedir" << endl << (unsigned long)dir << endl;
trace_lock.Unlock();
closedir(dir);
fuse_reply_err(req, 0);
}
static void ft_ll_mknod(fuse_req_t req, fuse_ino_t parent, const char *name,
mode_t mode, dev_t rdev)
{
string path;
Inode *pin = 0;
int res = 0;
lock.Lock();
pin = inode_map[parent];
if (!make_inode_path(path, pin, name))
res = ENOENT;
lock.Unlock();
dout << "mknod " << path << endl;
if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) res = ::mknod(path.c_str(), mode, rdev);
if (res < 0)
res = errno;
else
::chown(path.c_str(), fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
struct fuse_entry_param fe;
if (res == 0) {
memset(&fe, 0, sizeof(fe));
::lstat(path.c_str(), &fe.attr);
fe.ino = fe.attr.st_ino;
lock.Lock();
Inode *in = add_inode(pin, name, &fe.attr);
in->ref++;
lock.Unlock();
}
trace_lock.Lock();
print_time();
traceout << "ll_mknod" << endl << parent << endl << name << endl << mode << endl << rdev << endl;
traceout << (res == 0 ? fe.ino:0) << endl;
trace_lock.Unlock();
if (res == 0)
fuse_reply_entry(req, &fe);
else
fuse_reply_err(req, res);
}
static void ft_ll_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name,
mode_t mode)
{
string path;
Inode *pin = 0;
int res = 0;
lock.Lock();
pin = inode_map[parent];
if (!make_inode_path(path, pin, name))
res = ENOENT;
lock.Unlock();
if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) res = ::mkdir(path.c_str(), mode);
if (res < 0)
res = errno;
else
::chown(path.c_str(), fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
struct fuse_entry_param fe;
if (res == 0) {
memset(&fe, 0, sizeof(fe));
::lstat(path.c_str(), &fe.attr);
fe.ino = fe.attr.st_ino;
lock.Lock();
Inode *in = add_inode(pin, name, &fe.attr);
in->ref++;
lock.Unlock();
}
trace_lock.Lock();
print_time();
traceout << "ll_mkdir" << endl << parent << endl << name << endl << mode << endl;
traceout << (res == 0 ? fe.ino:0) << endl;
trace_lock.Unlock();
if (res == 0)
fuse_reply_entry(req, &fe);
else
fuse_reply_err(req, res);
}
static void ft_ll_symlink(fuse_req_t req, const char *value, fuse_ino_t parent, const char *name)
{
string path;
Inode *pin = 0;
int res = 0;
lock.Lock();
pin = inode_map[parent];
if (!make_inode_path(path, pin, name))
res = ENOENT;
lock.Unlock();
if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) res = ::symlink(value, path.c_str());
if (res < 0)
res = errno;
else
::chown(path.c_str(), fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
struct fuse_entry_param fe;
if (res == 0) {
memset(&fe, 0, sizeof(fe));
::lstat(path.c_str(), &fe.attr);
fe.ino = fe.attr.st_ino;
lock.Lock();
Inode *in = add_inode(pin, name, &fe.attr);
in->ref++;
lock.Unlock();
}
trace_lock.Lock();
print_time();
traceout << "ll_symlink" << endl << parent << endl << name << endl << value << endl;
traceout << (res == 0 ? fe.ino:0) << endl;
trace_lock.Unlock();
if (res == 0)
fuse_reply_entry(req, &fe);
else
fuse_reply_err(req, res);
}
static void ft_ll_create(fuse_req_t req, fuse_ino_t parent, const char *name,
mode_t mode, struct fuse_file_info *fi)
{
string path;
Inode *pin = 0;
int res = 0;
lock.Lock();
pin = inode_map[parent];
if (!make_inode_path(path, pin, name))
res = ENOENT;
lock.Unlock();
dout << "create " << path << endl;
int fd = 0;
if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) {
fd = ::open(path.c_str(), fi->flags|O_CREAT, mode);
if (fd < 0) {
res = errno;
} else {
::fchown(fd, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
}
}
struct fuse_entry_param fe;
memset(&fe, 0, sizeof(fe));
if (res == 0) {
::lstat(path.c_str(), &fe.attr);
fe.ino = fe.attr.st_ino;
lock.Lock();
Inode *in = add_inode(pin, name, &fe.attr);
in->ref++;
in->fds.insert(fd);
lock.Unlock();
fi->fh = fd;
}
trace_lock.Lock();
print_time();
traceout << "ll_create" << endl
<< parent << endl
<< name << endl
<< mode << endl
<< fi->flags << endl
<< (res == 0 ? fd:0) << endl
<< fe.ino << endl;
trace_lock.Unlock();
if (res == 0)
fuse_reply_create(req, &fe, fi);
else
fuse_reply_err(req, res);
}
static void ft_ll_statfs(fuse_req_t req, fuse_ino_t ino)
{
string path;
int res = 0;
if (ino) {
lock.Lock();
if (!make_ino_path(path, ino))
res = ENOENT;
lock.Unlock();
} else {
path = basedir;
}
trace_lock.Lock();
print_time();
traceout << "ll_statfs" << endl << ino << endl;
trace_lock.Unlock();
struct statvfs stbuf;
if (res == 0) res = statvfs(path.c_str(), &stbuf);
if (res < 0) res = errno;
if (res == 0)
fuse_reply_statfs(req, &stbuf);
else
fuse_reply_err(req, res);
}
static void ft_ll_unlink(fuse_req_t req, fuse_ino_t parent, const char *name)
{
string path;
Inode *pin = 0;
Inode *in = 0;
string dname(name);
int res = 0;
lock.Lock();
pin = inode_map[parent];
in = pin->lookup(dname);
if (!make_inode_path(path, pin, name))
res = ENOENT;
lock.Unlock();
trace_lock.Lock();
print_time();
traceout << "ll_unlink" << endl << parent << endl << name << endl;
trace_lock.Unlock();
if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) {
if (in && in->fds.empty()) {
int fd = ::open(path.c_str(), O_RDWR);
if (fd > 0)
in->fds.insert(fd); // for slow getattrs.. wtf
dout << "unlink opening paranoia fd " << fd << endl;
}
res = ::unlink(path.c_str());
if (res < 0) res = errno;
}
if (res == 0) {
// remove from out cache
lock.Lock();
string dname(name);
if (pin->lookup(dname))
remove_dentry(pin, dname);
lock.Unlock();
fuse_reply_err(req, 0);
} else
fuse_reply_err(req, res);
}
static void ft_ll_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name)
{
string path;
Inode *pin = 0;
int res = 0;
lock.Lock();
pin = inode_map[parent];
if (!make_inode_path(path, pin, name))
res = ENOENT;
lock.Unlock();
trace_lock.Lock();
print_time();
traceout << "ll_rmdir" << endl << parent << endl << name << endl;
trace_lock.Unlock();
if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) res = ::rmdir(path.c_str());
if (res < 0) res = errno;
if (res == 0) {
// remove from out cache
lock.Lock();
string dname(name);
if (pin->lookup(dname))
remove_dentry(pin, dname);
lock.Unlock();
fuse_reply_err(req, 0);
} else
fuse_reply_err(req, res);
}
static void ft_ll_rename(fuse_req_t req, fuse_ino_t parent, const char *name,
fuse_ino_t newparent, const char *newname)
{
string path;
string newpath;
Inode *pin = 0;
Inode *newpin = 0;
int res = 0;
lock.Lock();
pin = inode_map[parent];
if (!make_inode_path(path, pin, name))
res = ENOENT;
newpin = inode_map[newparent];
if (!make_inode_path(newpath, newpin, newname))
res = ENOENT;
lock.Unlock();
trace_lock.Lock();
print_time();
traceout << "ll_rename" << endl
<< parent << endl
<< name << endl
<< newparent << endl
<< newname << endl;
trace_lock.Unlock();
if (res == 0 && (!has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid) ||
!has_perm(0010, newpin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)))
res = EPERM;
else if (res == 0) res = ::rename(path.c_str(), newpath.c_str());
if (res < 0) res = errno;
if (res == 0) {
string dname(name);
string newdname(newname);
lock.Lock();
Inode *in = pin->lookup(dname);
if (in) {
add_dentry(newpin, newdname, in);
remove_dentry(pin, dname);
} else {
dout << "hrm, rename didn't have renamed inode.. " << path << " to " << newpath << endl;
}
lock.Unlock();
fuse_reply_err(req, 0);
} else
fuse_reply_err(req, res);
}
static void ft_ll_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent,
const char *newname)
{
string path;
string newpath;
Inode *in = 0;
Inode *newpin = 0;
int res = 0;
lock.Lock();
in = inode_map[ino];
if (!make_inode_path(path, in))
res = ENOENT;
newpin = inode_map[newparent];
if (!make_inode_path(newpath, newpin, newname))
res = ENOENT;
lock.Unlock();
trace_lock.Lock();
print_time();
traceout << "ll_link" << endl
<< ino << endl
<< newparent << endl
<< newname << endl;
trace_lock.Unlock();
//cout << "link " << path << " newpath " << newpath << endl;
if (res == 0 && (!has_perm(0010, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid) ||
!has_perm(0010, newpin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)))
res = EPERM;
else if (res == 0) res = ::link(path.c_str(), newpath.c_str());
if (res < 0) res = errno;
if (res == 0) {
struct fuse_entry_param fe;
memset(&fe, 0, sizeof(fe));
::lstat(newpath.c_str(), &fe.attr);
lock.Lock();
string newdname(newname);
add_dentry(newpin, newdname, in);
in->ref++;
memcpy(&in->stbuf, &fe.attr, sizeof(fe.attr)); // re-read, bc we changed the link count
lock.Unlock();
fe.ino = fe.attr.st_ino;
fuse_reply_entry(req, &fe);
} else
fuse_reply_err(req, res);
}
static void ft_ll_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
{
string path;
Inode *in = 0;
int res = 0;
lock.Lock();
in = inode_map[ino];
if (!make_inode_path(path, in))
res = ENOENT;
lock.Unlock();
int want = 0100;
if (fi->flags & O_RDWR) want |= 0010;
if (fi->flags == O_WRONLY) want = 0010;
int fd = 0;
if (res == 0 && !has_perm(want, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
res = EPERM;
else if (res == 0) {
fd = ::open(path.c_str(), fi->flags);
if (fd <= 0) res = errno;
}
trace_lock.Lock();
print_time();
traceout << "ll_open" << endl
<< ino << endl
<< fi->flags << endl
<< (fd > 0 ? fd:0) << endl;
trace_lock.Unlock();
if (res == 0) {
lock.Lock();
in->fds.insert(fd);
lock.Unlock();
fi->fh = fd;
fuse_reply_open(req, fi);
} else
fuse_reply_err(req, res);
}
static void ft_ll_read(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off,
struct fuse_file_info *fi)
{
char *buf = new char[size];
int res = ::pread(fi->fh, buf, size, off);
//cout << "read " << path << " " << off << "~" << size << endl;
trace_lock.Lock();