ceph/fusetrace/fusetrace_ll.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:4; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=4 smarttab
   3
   4 /*
   5     FUSE: Filesystem in Userspace
   6     Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
   7
   8     This program can be distributed under the terms of the GNU GPL.
   9     See the file COPYING.
  10
  11     gcc -Wall `pkg-config fuse --cflags --libs` -lulockmgr fusexmp_fh.c -o fusexmp_fh
  12 */
  13
  14 #define FUSE_USE_VERSION 30
  15
  16 #ifdef HAVE_CONFIG_H
  17 #include <config.h>
  18 #endif
  19
  20
  21 #include <fuse/fuse_lowlevel.h>
  22 #include <ulockmgr.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <dirent.h>
  28 #include <errno.h>
  29 #include <sys/time.h>
  30 #ifdef HAVE_SETXATTR
  31 #include <sys/xattr.h>
  32 #endif
  33 #include <time.h>
  34
  35
  36 #include "include/unordered_map.h"
  37 #include "include/hash_namespace.h"
  38
  39 #ifndef __LP64__
  40 CEPH_HASH_NAMESPACE_START
  41   template<> struct hash<uint64_t> {
  42     size_t operator()(uint64_t __x) const {
  43       static hash<uint32_t> H;
  44       return H((__x >> 32) ^ (__x & 0xffffffff));
  45     }
  46   };
  47 CEPH_HASH_NAMESPACE_END
  48 #endif
  49
  50
  51 #include <iostream>
  52 #include <fstream>
  53 #include <map>
  54 #include <set>
  55 using namespace std;
  56
  57 #include "common/Mutex.h"
  58
  59 Mutex trace_lock;
  60 ofstream tracefile;
  61
  62 #define traceout (tracefile.is_open() ? tracefile : cout)
  63
  64 char *basedir = 0;
  65 int debug = 0;
  66 bool do_timestamps = true;
  67
  68 #define dout if (debug) cout
  69
  70 Mutex lock;
  71
  72 struct Inode {
  73     struct stat stbuf;
  74     int ref;
  75     set<int> fds;
  76
  77     map<pair<string,ino_t>,Inode*> parents;
  78
  79     // if dir,
  80     map<string,Inode*> dentries;
  81
  82     Inode() : ref(0) {}
  83
  84     Inode *lookup(const string& dname) {
  85         if (dentries.count(dname))
  86             return dentries[dname];
  87         return 0;
  88     }
  89 };
  90
  91 Inode *root = 0;
  92 ceph::unordered_map<ino_t, Inode*> inode_map;
  93
  94 bool make_inode_path(string &buf, Inode *in)
  95 {
  96     if (!in->parents.empty()) {
  97         if (!make_inode_path(buf, in->parents.begin()->second))
  98             return false;
  99         buf += "/";
 100         buf += in->parents.begin()->first.first;
 101     } else {
 102         if (in != root) return false;
 103         assert(in->stbuf.st_ino == 1);
 104         buf = basedir;
 105         buf += "/";
 106     }
 107     return true;
 108     //dout << "path: " << in->stbuf.st_ino << " -> " << buf << endl;
 109 }
 110
 111 bool make_inode_path(string &buf, Inode *in, const char *name)
 112 {
 113     if (!make_inode_path(buf, in)) return false;
 114     buf += "/";
 115     buf += name;
 116     return true;
 117 }
 118
 119 bool make_ino_path(string &buf, ino_t ino)
 120 {
 121     Inode *in = inode_map[ino];
 122     assert(in);
 123     return make_inode_path(buf, in);
 124 }
 125
 126 bool make_ino_path(string &buf, ino_t ino, const char *name)
 127 {
 128     Inode *in = inode_map[ino];
 129     assert(in);
 130     if (!make_inode_path(buf, in))
 131         return false;
 132     buf += "/";
 133     buf += name;
 134     return true;
 135 }
 136
 137 void remove_dentry(Inode *pin, const string& dname)
 138 {
 139     dout << "remove_dentry " << pin->stbuf.st_ino << " " << dname << endl;
 140
 141     Inode *in = pin->lookup(dname);
 142     assert(in);
 143     pin->dentries.erase(dname);
 144     in->parents.erase(pair<string,ino_t>(dname,pin->stbuf.st_ino));
 145
 146     dout << "remove_dentry " << pin->stbuf.st_ino << " " << dname
 147          << " ... inode " << in->stbuf.st_ino << " ref " << in->ref
 148          << endl;
 149 }
 150
 151 void add_dentry(Inode *parent, const string& dname, Inode *in)
 152 {
 153     dout << "add_dentry " << parent->stbuf.st_ino << " " << dname << " to " << in->stbuf.st_ino << endl;
 154
 155     if (parent->dentries.count(dname))
 156         remove_dentry(parent, dname);  // e.g., when renaming over another file..
 157
 158     parent->dentries[dname] = in;
 159     in->parents[pair<string,ino_t>(dname,parent->stbuf.st_ino)] = parent;
 160 }
 161
 162 void unlink_inode(Inode *in)
 163 {
 164     dout << "unlink_inode " << in->stbuf.st_ino << " ref " << in->ref << endl;
 165
 166     // remove parent links
 167     while (!in->parents.empty()) {
 168         Inode *parent = in->parents.begin()->second;
 169         string dname = in->parents.begin()->first.first;
 170         remove_dentry(parent, dname);
 171     }
 172
 173     // remove children
 174     while (!in->dentries.empty())
 175         remove_dentry(in, in->dentries.begin()->first);
 176
 177     while (!in->fds.empty()) {
 178         int fd = *in->fds.begin();
 179         ::close(fd);
 180         in->fds.erase(in->fds.begin());
 181         dout << "remove_inode closeing stray fd " << fd << endl;
 182     }
 183 }
 184
 185 void remove_inode(Inode *in)
 186 {
 187     dout << "remove_inode " << in->stbuf.st_ino << " ref " << in->ref << endl;
 188
 189     unlink_inode(in);
 190
 191     inode_map.erase(in->stbuf.st_ino);
 192     dout << "remove_inode " << in->stbuf.st_ino << " done" << endl;
 193     delete in;
 194 }
 195
 196 Inode *add_inode(Inode *parent, const char *name, struct stat *attr)
 197 {
 198     dout << "add_inode " << parent->stbuf.st_ino << " " << name << " " << attr->st_ino << endl;
 199
 200     Inode *in;
 201     if (inode_map.count(attr->st_ino)) {
 202         // reuse inode
 203         in = inode_map[attr->st_ino];
 204         unlink_inode(in);  // hrm.. should this close open fds?  probably.
 205         dout << "** REUSING INODE **" << endl;
 206     } else {
 207         inode_map[attr->st_ino] = in = new Inode;
 208     }
 209     memcpy(&in->stbuf, attr, sizeof(*attr));
 210
 211     string dname(name);
 212     add_dentry(parent, dname, in);
 213
 214     return in;
 215 }
 216
 217
 218 void print_time()
 219 {
 220     if (do_timestamps) {
 221         struct timeval tv;
 222         gettimeofday(&tv, 0);
 223         traceout << "@" << endl
 224                  << tv.tv_sec << endl
 225                  << tv.tv_usec << endl;
 226     }
 227 }
 228
 229
 230 bool has_perm(int mask, Inode *in, int uid, int gid)
 231 {
 232     dout << "hash_perm " << uid << "." << gid << " " << oct << mask << " in " << in->stbuf.st_mode
 233          << " " << in->stbuf.st_uid << "." << in->stbuf.st_gid << endl;
 234     if (in->stbuf.st_mode & mask) return true;
 235     if (in->stbuf.st_gid == gid && in->stbuf.st_mode & (mask << 3)) return true;
 236     if (in->stbuf.st_uid == uid && in->stbuf.st_mode & (mask << 6)) return true;
 237     return false;
 238 }
 239
 240
 241 static void ft_ll_lookup(fuse_req_t req, fuse_ino_t pino, const char *name)
 242 {
 243     int res = 0;
 244
 245     //dout << "lookup " << pino << " " << name << endl;
 246
 247     struct fuse_entry_param fe;
 248     memset(&fe, 0, sizeof(fe));
 249
 250     lock.Lock();
 251     Inode *parent = inode_map[pino];
 252     assert(parent);
 253
 254     // check permissions
 255
 256     string dname(name);
 257     string path;
 258     Inode *in = 0;
 259     if (!has_perm(0001, parent, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)) {
 260         res = EPERM;
 261     }
 262     else if (!make_inode_path(path, parent, name)) {
 263         res = ENOENT;
 264     } else {
 265         in = parent->lookup(dname);
 266         if (in && res == 0) {
 267             // re-stat, for good measure
 268             res = ::lstat(path.c_str(), &in->stbuf);
 269
 270             // hrm!
 271             if (res != 0) {
 272                 dout << "** WEIRD ** lookup on " << pino << " " << name << " inode went away!" << endl;
 273                 in = 0;
 274                 res = errno;
 275             }
 276
 277             //dout << "have " << in->stbuf.st_ino << endl;
 278         } else {
 279             in = new Inode;
 280             res = ::lstat(path.c_str(), &in->stbuf);
 281             //dout << "stat " << path << " res = " << res << endl;
 282             if (res == 0) {
 283                 inode_map[in->stbuf.st_ino] = in;
 284                 add_dentry(parent, dname, in);
 285             } else {
 286                 delete in;
 287                 in = 0;
 288                 res = errno;
 289             }
 290         }
 291         if (in) {
 292             in->ref++;
 293             fe.ino = in->stbuf.st_ino;
 294             memcpy(&fe.attr, &in->stbuf, sizeof(in->stbuf));
 295         }
 296     }
 297     lock.Unlock();
 298
 299     trace_lock.Lock();
 300     print_time();
 301     traceout << "ll_lookup" << endl << pino << endl << name << endl << fe.attr.st_ino << endl;
 302     trace_lock.Unlock();
 303
 304     if (in)
 305         fuse_reply_entry(req, &fe);
 306     else
 307         fuse_reply_err(req, res);
 308 }
 309
 310 static void ft_ll_forget(fuse_req_t req, fuse_ino_t ino, long unsigned nlookup)
 311 {
 312     if (ino != 1) {
 313         lock.Lock();
 314         Inode *in = inode_map[ino];
 315         if (in) {
 316             dout << "forget on " << ino << " ref " << in->ref << ", forget " << nlookup << endl;
 317             if (in->ref < nlookup)
 318                 dout << "**** BAD **** forget on " << ino << " ref " << in->ref << ", forget " << nlookup << endl;
 319
 320             in->ref -= nlookup;
 321             if (in->ref <= 0)
 322                 remove_inode(in);
 323         } else {
 324             dout << "**** BAD **** forget " << nlookup << " on nonexistent inode " << ino << endl;
 325         }
 326         lock.Unlock();
 327     }
 328
 329     trace_lock.Lock();
 330     print_time();
 331     traceout << "ll_forget" << endl << ino << endl << nlookup << endl;
 332     trace_lock.Unlock();
 333
 334     fuse_reply_none(req);
 335 }
 336
 337 static void ft_ll_getattr(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
 338 {
 339     int res = 0;
 340     string path;
 341     int fd = 0;
 342
 343     Inode *in = 0;
 344     struct stat attr;
 345
 346     lock.Lock();
 347     in = inode_map[ino];
 348     if (in->fds.empty()) {
 349         if (!make_inode_path(path, in))
 350             res = ENOENT;
 351     } else
 352         fd = *in->fds.begin();
 353     lock.Unlock();
 354
 355     if (fd > 0) {
 356         res = ::fstat(fd, &attr);
 357         dout << "getattr fstat on fd " << fd << " res " << res << endl;
 358     } else if (res == 0) {
 359         res = ::lstat(path.c_str(), &attr);
 360         dout << "getattr lstat on " << path << " res " << res << endl;
 361     }
 362     if (res < 0) res = errno;
 363     if (ino == 1) attr.st_ino = 1;
 364
 365     trace_lock.Lock();
 366     print_time();
 367     traceout << "ll_getattr" << endl << ino << endl;
 368     trace_lock.Unlock();
 369
 370     if (res == 0) {
 371         lock.Lock();
 372         memcpy(&in->stbuf, &attr, sizeof(attr));
 373         lock.Unlock();
 374         fuse_reply_attr(req, &attr, 0);
 375     } else
 376         fuse_reply_err(req, res);
 377 }
 378
 379 static void ft_ll_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
 380                           int to_set, struct fuse_file_info *fi)
 381 {
 382     string path;
 383     Inode *in = 0;
 384     int fd = 0;
 385     int res = 0;
 386
 387     lock.Lock();
 388     in = inode_map[ino];
 389     if (in->fds.empty() || (to_set & FUSE_SET_ATTR_MTIME)) {
 390         if (!make_inode_path(path, in))
 391             res = ENOENT;
 392     } else
 393         fd = *in->fds.begin();
 394     lock.Unlock();
 395
 396     trace_lock.Lock();
 397     print_time();
 398     traceout << "ll_setattr" << endl << ino << endl;
 399     traceout << attr->st_mode << endl;
 400     traceout << attr->st_uid << endl << attr->st_gid << endl;
 401     traceout << attr->st_size << endl;
 402     traceout << attr->st_mtime << endl;
 403     traceout << attr->st_atime << endl;
 404     traceout << to_set << endl;
 405     trace_lock.Unlock();
 406
 407     if (res == 0 && !has_perm(0010, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)) {
 408         res = EPERM;
 409     } else if (res == 0) {
 410         if (to_set & FUSE_SET_ATTR_MODE) {
 411             if (fd > 0)
 412                 res = ::fchmod(fd, attr->st_mode);
 413             else
 414                 res = ::chmod(path.c_str(), attr->st_mode);
 415         }
 416         if (!res && to_set & FUSE_SET_ATTR_UID) {
 417             if (fd > 0)
 418                 res = ::fchown(fd, attr->st_uid, attr->st_gid);
 419             else
 420                 res = ::chown(path.c_str(), attr->st_uid, attr->st_gid);
 421         }
 422         if (!res && to_set & FUSE_SET_ATTR_SIZE) {
 423             if (fd > 0)
 424                 res = ::ftruncate(fd, attr->st_size);
 425             else
 426                 res = ::truncate(path.c_str(), attr->st_size);
 427         }
 428         if (!res && to_set & FUSE_SET_ATTR_MTIME) {
 429             struct utimbuf ut;
 430             ut.actime = attr->st_atime;
 431             ut.modtime = attr->st_mtime;
 432             res = ::utime(path.c_str(), &ut);
 433         }
 434         if (res < 0) res = errno;
 435     }
 436
 437     if (res == 0) {
 438         lock.Lock();
 439         ::lstat(path.c_str(), &in->stbuf);
 440         if (ino == 1) in->stbuf.st_ino = 1;
 441         memcpy(attr, &in->stbuf, sizeof(*attr));
 442         lock.Unlock();
 443         fuse_reply_attr(req, attr, 0);
 444     } else
 445         fuse_reply_err(req, res);
 446 }
 447
 448
 449 static void ft_ll_readlink(fuse_req_t req, fuse_ino_t ino)
 450 {
 451     string path;
 452     int res = 0;
 453
 454     lock.Lock();
 455     if (!make_ino_path(path, ino))
 456         res = ENOENT;
 457     lock.Unlock();
 458
 459     trace_lock.Lock();
 460     print_time();
 461     traceout << "ll_readlink" << endl << ino << endl;
 462     trace_lock.Unlock();
 463
 464     char buf[256];
 465     if (res == 0) res = readlink(path.c_str(), buf, 255);
 466     if (res < 0) res = errno;
 467
 468     if (res >= 0) {
 469         buf[res] = 0;
 470         fuse_reply_readlink(req, buf);
 471     } else {
 472         fuse_reply_err(req, res);
 473     }
 474 }
 475
 476
 477 static void ft_ll_opendir(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
 478 {
 479     string path;
 480     int res = 0;
 481     lock.Lock();
 482     Inode *in = inode_map[ino];
 483     if (!make_inode_path(path, in))
 484         res = ENOENT;
 485     lock.Unlock();
 486
 487     DIR *dir = 0;
 488     if (res == 0 && !has_perm(0100, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 489         res = EPERM;
 490     else if (res == 0) dir = opendir(path.c_str());
 491     if (res < 0) res = errno;
 492
 493     trace_lock.Lock();
 494     print_time();
 495     traceout << "ll_opendir" << endl << ino << endl << (unsigned long)dir << endl;
 496     trace_lock.Unlock();
 497
 498     if (dir) {
 499         fi->fh = (long)dir;
 500         fuse_reply_open(req, fi);
 501     } else
 502         fuse_reply_err(req, res);
 503 }
 504
 505 static void ft_ll_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
 506                             off_t off, struct fuse_file_info *fi)
 507 {
 508     struct dirent *de;
 509     DIR *dp = (DIR*)fi->fh;
 510
 511     // buffer
 512     char *buf;
 513     size_t pos = 0;
 514
 515     buf = new char[size];
 516     if (!buf) {
 517         fuse_reply_err(req, ENOMEM);
 518         return;
 519     }
 520
 521     seekdir(dp, off);
 522     while ((de = readdir(dp)) != NULL) {
 523         struct stat st;
 524         memset(&st, 0, sizeof(st));
 525         st.st_ino = de->d_ino;
 526         st.st_mode = de->d_type << 12;
 527
 528         size_t entrysize = fuse_add_direntry(req, buf + pos, size - pos,
 529                                              de->d_name, &st, telldir(dp));
 530         if (entrysize > size - pos)
 531             break;  // didn't fit, done for now.
 532         pos += entrysize;
 533     }
 534
 535     fuse_reply_buf(req, buf, pos);
 536     delete[] buf;
 537 }
 538
 539 static void ft_ll_releasedir(fuse_req_t req, fuse_ino_t ino,
 540                              struct fuse_file_info *fi)
 541 {
 542     DIR *dir = (DIR*)fi->fh;
 543
 544     trace_lock.Lock();
 545     print_time();
 546     traceout << "ll_releasedir" << endl << (unsigned long)dir << endl;
 547     trace_lock.Unlock();
 548
 549     closedir(dir);
 550     fuse_reply_err(req, 0);
 551 }
 552
 553
 554
 555 static void ft_ll_mknod(fuse_req_t req, fuse_ino_t parent, const char *name,
 556                         mode_t mode, dev_t rdev)
 557 {
 558     string path;
 559     Inode *pin = 0;
 560     int res = 0;
 561     lock.Lock();
 562     pin = inode_map[parent];
 563     if (!make_inode_path(path, pin, name))
 564         res = ENOENT;
 565     lock.Unlock();
 566
 567     dout << "mknod " << path << endl;
 568     if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 569         res = EPERM;
 570     else if (res == 0) res = ::mknod(path.c_str(), mode, rdev);
 571     if (res < 0)
 572         res = errno;
 573     else
 574         ::chown(path.c_str(), fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
 575
 576     struct fuse_entry_param fe;
 577     if (res == 0) {
 578         memset(&fe, 0, sizeof(fe));
 579         ::lstat(path.c_str(), &fe.attr);
 580         fe.ino = fe.attr.st_ino;
 581         lock.Lock();
 582         Inode *in = add_inode(pin, name, &fe.attr);
 583         in->ref++;
 584         lock.Unlock();
 585     }
 586
 587     trace_lock.Lock();
 588     print_time();
 589     traceout << "ll_mknod" << endl << parent << endl << name << endl << mode << endl << rdev << endl;
 590     traceout << (res == 0 ? fe.ino:0) << endl;
 591     trace_lock.Unlock();
 592
 593     if (res == 0)
 594         fuse_reply_entry(req, &fe);
 595     else
 596         fuse_reply_err(req, res);
 597 }
 598
 599 static void ft_ll_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name,
 600                         mode_t mode)
 601 {
 602     string path;
 603     Inode *pin = 0;
 604     int res = 0;
 605     lock.Lock();
 606     pin = inode_map[parent];
 607     if (!make_inode_path(path, pin, name))
 608         res = ENOENT;
 609     lock.Unlock();
 610
 611     if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 612         res = EPERM;
 613     else if (res == 0) res = ::mkdir(path.c_str(), mode);
 614     if (res < 0)
 615         res = errno;
 616     else
 617         ::chown(path.c_str(), fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
 618
 619     struct fuse_entry_param fe;
 620     if (res == 0) {
 621         memset(&fe, 0, sizeof(fe));
 622         ::lstat(path.c_str(), &fe.attr);
 623         fe.ino = fe.attr.st_ino;
 624         lock.Lock();
 625         Inode *in = add_inode(pin, name, &fe.attr);
 626         in->ref++;
 627         lock.Unlock();
 628     }
 629
 630     trace_lock.Lock();
 631     print_time();
 632     traceout << "ll_mkdir" << endl << parent << endl << name << endl << mode << endl;
 633     traceout << (res == 0 ? fe.ino:0) << endl;
 634     trace_lock.Unlock();
 635
 636     if (res == 0)
 637         fuse_reply_entry(req, &fe);
 638     else
 639         fuse_reply_err(req, res);
 640 }
 641
 642 static void ft_ll_symlink(fuse_req_t req, const char *value, fuse_ino_t parent, const char *name)
 643 {
 644     string path;
 645     Inode *pin = 0;
 646     int res = 0;
 647
 648     lock.Lock();
 649     pin = inode_map[parent];
 650     if (!make_inode_path(path, pin, name))
 651         res = ENOENT;
 652     lock.Unlock();
 653
 654     if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 655         res = EPERM;
 656     else if (res == 0) res = ::symlink(value, path.c_str());
 657     if (res < 0)
 658         res = errno;
 659     else
 660         ::chown(path.c_str(), fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
 661
 662     struct fuse_entry_param fe;
 663     if (res == 0) {
 664         memset(&fe, 0, sizeof(fe));
 665         ::lstat(path.c_str(), &fe.attr);
 666         fe.ino = fe.attr.st_ino;
 667         lock.Lock();
 668         Inode *in = add_inode(pin, name, &fe.attr);
 669         in->ref++;
 670         lock.Unlock();
 671     }
 672
 673     trace_lock.Lock();
 674     print_time();
 675     traceout << "ll_symlink" << endl << parent << endl << name << endl << value << endl;
 676     traceout << (res == 0 ? fe.ino:0) << endl;
 677     trace_lock.Unlock();
 678
 679     if (res == 0)
 680         fuse_reply_entry(req, &fe);
 681     else
 682         fuse_reply_err(req, res);
 683 }
 684
 685 static void ft_ll_create(fuse_req_t req, fuse_ino_t parent, const char *name,
 686                          mode_t mode, struct fuse_file_info *fi)
 687 {
 688     string path;
 689     Inode *pin = 0;
 690     int res = 0;
 691
 692     lock.Lock();
 693     pin = inode_map[parent];
 694     if (!make_inode_path(path, pin, name))
 695         res = ENOENT;
 696     lock.Unlock();
 697
 698     dout << "create " << path << endl;
 699     int fd = 0;
 700     if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 701         res = EPERM;
 702     else if (res == 0) {
 703         fd = ::open(path.c_str(), fi->flags|O_CREAT, mode);
 704         if (fd < 0) {
 705             res = errno;
 706         } else {
 707             ::fchown(fd, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid);
 708         }
 709     }
 710
 711     struct fuse_entry_param fe;
 712     memset(&fe, 0, sizeof(fe));
 713     if (res == 0) {
 714         ::lstat(path.c_str(), &fe.attr);
 715         fe.ino = fe.attr.st_ino;
 716         lock.Lock();
 717         Inode *in = add_inode(pin, name, &fe.attr);
 718         in->ref++;
 719         in->fds.insert(fd);
 720         lock.Unlock();
 721         fi->fh = fd;
 722     }
 723
 724     trace_lock.Lock();
 725     print_time();
 726     traceout << "ll_create" << endl
 727              << parent << endl
 728              << name << endl
 729              << mode << endl
 730              << fi->flags << endl
 731              << (res == 0 ? fd:0) << endl
 732              << fe.ino << endl;
 733     trace_lock.Unlock();
 734
 735     if (res == 0)
 736         fuse_reply_create(req, &fe, fi);
 737     else
 738         fuse_reply_err(req, res);
 739
 740 }
 741
 742
 743 static void ft_ll_statfs(fuse_req_t req, fuse_ino_t ino)
 744 {
 745     string path;
 746     int res = 0;
 747     if (ino) {
 748         lock.Lock();
 749         if (!make_ino_path(path, ino))
 750             res = ENOENT;
 751         lock.Unlock();
 752     } else {
 753         path = basedir;
 754     }
 755
 756     trace_lock.Lock();
 757     print_time();
 758     traceout << "ll_statfs" << endl << ino << endl;
 759     trace_lock.Unlock();
 760
 761     struct statvfs stbuf;
 762     if (res == 0) res = statvfs(path.c_str(), &stbuf);
 763     if (res < 0) res = errno;
 764
 765     if (res == 0)
 766         fuse_reply_statfs(req, &stbuf);
 767     else
 768         fuse_reply_err(req, res);
 769 }
 770
 771 static void ft_ll_unlink(fuse_req_t req, fuse_ino_t parent, const char *name)
 772 {
 773     string path;
 774     Inode *pin = 0;
 775     Inode *in = 0;
 776     string dname(name);
 777     int res = 0;
 778     lock.Lock();
 779     pin = inode_map[parent];
 780     in = pin->lookup(dname);
 781     if (!make_inode_path(path, pin, name))
 782         res = ENOENT;
 783     lock.Unlock();
 784
 785     trace_lock.Lock();
 786     print_time();
 787     traceout << "ll_unlink" << endl << parent << endl << name << endl;
 788     trace_lock.Unlock();
 789
 790     if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 791         res = EPERM;
 792     else if (res == 0) {
 793         if (in && in->fds.empty()) {
 794             int fd = ::open(path.c_str(), O_RDWR);
 795             if (fd > 0)
 796                 in->fds.insert(fd);  // for slow getattrs.. wtf
 797             dout << "unlink opening paranoia fd " << fd << endl;
 798         }
 799         res = ::unlink(path.c_str());
 800         if (res < 0) res = errno;
 801     }
 802
 803     if (res == 0) {
 804         // remove from out cache
 805         lock.Lock();
 806         string dname(name);
 807         if (pin->lookup(dname))
 808             remove_dentry(pin, dname);
 809         lock.Unlock();
 810         fuse_reply_err(req, 0);
 811     } else
 812         fuse_reply_err(req, res);
 813 }
 814
 815 static void ft_ll_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name)
 816 {
 817     string path;
 818     Inode *pin = 0;
 819     int res = 0;
 820
 821     lock.Lock();
 822     pin = inode_map[parent];
 823     if (!make_inode_path(path, pin, name))
 824         res = ENOENT;
 825     lock.Unlock();
 826
 827     trace_lock.Lock();
 828     print_time();
 829     traceout << "ll_rmdir" << endl << parent << endl << name << endl;
 830     trace_lock.Unlock();
 831
 832     if (res == 0 && !has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 833         res = EPERM;
 834     else if (res == 0) res = ::rmdir(path.c_str());
 835     if (res < 0) res = errno;
 836
 837     if (res == 0) {
 838         // remove from out cache
 839         lock.Lock();
 840         string dname(name);
 841         if (pin->lookup(dname))
 842             remove_dentry(pin, dname);
 843         lock.Unlock();
 844         fuse_reply_err(req, 0);
 845     } else
 846         fuse_reply_err(req, res);
 847 }
 848
 849
 850 static void ft_ll_rename(fuse_req_t req, fuse_ino_t parent, const char *name,
 851                          fuse_ino_t newparent, const char *newname)
 852 {
 853     string path;
 854     string newpath;
 855     Inode *pin = 0;
 856     Inode *newpin = 0;
 857     int res = 0;
 858     lock.Lock();
 859     pin = inode_map[parent];
 860     if (!make_inode_path(path, pin, name))
 861         res = ENOENT;
 862     newpin = inode_map[newparent];
 863     if (!make_inode_path(newpath, newpin, newname))
 864         res = ENOENT;
 865     lock.Unlock();
 866
 867     trace_lock.Lock();
 868     print_time();
 869     traceout << "ll_rename" << endl
 870              << parent << endl
 871              << name << endl
 872              << newparent << endl
 873              << newname << endl;
 874     trace_lock.Unlock();
 875
 876     if (res == 0 && (!has_perm(0010, pin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid) ||
 877                      !has_perm(0010, newpin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)))
 878         res = EPERM;
 879     else if (res == 0) res = ::rename(path.c_str(), newpath.c_str());
 880     if (res < 0) res = errno;
 881
 882     if (res == 0) {
 883         string dname(name);
 884         string newdname(newname);
 885         lock.Lock();
 886         Inode *in = pin->lookup(dname);
 887         if (in) {
 888             add_dentry(newpin, newdname, in);
 889             remove_dentry(pin, dname);
 890         } else {
 891             dout << "hrm, rename didn't have renamed inode.. " << path << " to " << newpath << endl;
 892         }
 893         lock.Unlock();
 894         fuse_reply_err(req, 0);
 895     } else
 896         fuse_reply_err(req, res);
 897 }
 898
 899 static void ft_ll_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent,
 900                        const char *newname)
 901 {
 902     string path;
 903     string newpath;
 904     Inode *in = 0;
 905     Inode *newpin = 0;
 906     int res = 0;
 907     lock.Lock();
 908     in = inode_map[ino];
 909     if (!make_inode_path(path, in))
 910         res = ENOENT;
 911
 912     newpin = inode_map[newparent];
 913     if (!make_inode_path(newpath, newpin, newname))
 914         res = ENOENT;
 915     lock.Unlock();
 916
 917     trace_lock.Lock();
 918     print_time();
 919     traceout << "ll_link" << endl
 920              << ino << endl
 921              << newparent << endl
 922              << newname << endl;
 923     trace_lock.Unlock();
 924
 925     //cout << "link " << path << " newpath " << newpath << endl;
 926     if (res == 0 && (!has_perm(0010, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid) ||
 927                      !has_perm(0010, newpin, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid)))
 928         res = EPERM;
 929     else if (res == 0) res = ::link(path.c_str(), newpath.c_str());
 930     if (res < 0) res = errno;
 931
 932     if (res == 0) {
 933         struct fuse_entry_param fe;
 934         memset(&fe, 0, sizeof(fe));
 935         ::lstat(newpath.c_str(), &fe.attr);
 936
 937         lock.Lock();
 938         string newdname(newname);
 939         add_dentry(newpin, newdname, in);
 940         in->ref++;
 941         memcpy(&in->stbuf, &fe.attr, sizeof(fe.attr));   // re-read, bc we changed the link count
 942         lock.Unlock();
 943
 944         fe.ino = fe.attr.st_ino;
 945         fuse_reply_entry(req, &fe);
 946     } else
 947         fuse_reply_err(req, res);
 948 }
 949
 950 static void ft_ll_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
 951 {
 952     string path;
 953     Inode *in = 0;
 954     int res = 0;
 955
 956     lock.Lock();
 957     in = inode_map[ino];
 958     if (!make_inode_path(path, in))
 959         res = ENOENT;
 960     lock.Unlock();
 961
 962     int want = 0100;
 963     if (fi->flags & O_RDWR) want |= 0010;
 964     if (fi->flags == O_WRONLY) want = 0010;
 965
 966     int fd = 0;
 967     if (res == 0 && !has_perm(want, in, fuse_req_ctx(req)->uid, fuse_req_ctx(req)->gid))
 968         res = EPERM;
 969     else if (res == 0) {
 970         fd = ::open(path.c_str(), fi->flags);
 971         if (fd <= 0) res = errno;
 972     }
 973
 974     trace_lock.Lock();
 975     print_time();
 976     traceout << "ll_open" << endl
 977              << ino << endl
 978              << fi->flags << endl
 979              << (fd > 0 ? fd:0) << endl;
 980     trace_lock.Unlock();
 981
 982     if (res == 0) {
 983         lock.Lock();
 984         in->fds.insert(fd);
 985         lock.Unlock();
 986         fi->fh = fd;
 987         fuse_reply_open(req, fi);
 988     } else
 989         fuse_reply_err(req, res);
 990 }
 991
 992 static void ft_ll_read(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off,
 993                        struct fuse_file_info *fi)
 994 {
 995
 996     char *buf = new char[size];
 997     int res = ::pread(fi->fh, buf, size, off);
 998
 999     //cout << "read " << path << " " << off << "~" << size << endl;
1000     trace_lock.Lock();
1001     print_time();
1002     traceout << "ll_read" << endl
1003              << fi->fh << endl
1004              << off << endl
1005              << size << endl;
1006     trace_lock.Unlock();
1007
1008     if (res >= 0)
1009         fuse_reply_buf(req, buf, res);
1010     else
1011         fuse_reply_err(req, errno);
1012     delete[] buf;
1013 }
1014
1015 static void ft_ll_write(fuse_req_t req, fuse_ino_t ino, const char *buf,
1016                            size_t size, off_t off, struct fuse_file_info *fi)
1017 {
1018     int res = ::pwrite(fi->fh, buf, size, off);
1019
1020     trace_lock.Lock();
1021     print_time();
1022     traceout << "ll_write" << endl
1023              << fi->fh << endl
1024              << off << endl
1025              << size << endl;
1026     trace_lock.Unlock();
1027
1028     if (res >= 0)
1029         fuse_reply_write(req, res);
1030     else
1031         fuse_reply_err(req, errno);
1032 }
1033
1034 static void ft_ll_flush(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
1035 {
1036     trace_lock.Lock();
1037     print_time();
1038     traceout << "ll_flush" << endl << fi->fh << endl;
1039     trace_lock.Unlock();
1040
1041     int res = ::fdatasync(fi->fh);
1042     //int res = ::close(dup(fi->fh));
1043     if (res >= 0)
1044         fuse_reply_err(req, 0);
1045     else
1046         fuse_reply_err(req, errno);
1047 }
1048
1049 static void ft_ll_release(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
1050 {
1051     trace_lock.Lock();
1052     print_time();
1053     traceout << "ll_release" << endl << fi->fh << endl;
1054     trace_lock.Unlock();
1055
1056     lock.Lock();
1057     Inode *in = inode_map[ino];
1058     in->fds.erase(fi->fh);
1059     lock.Unlock();
1060
1061     int res = ::close(fi->fh);
1062     if (res >= 0)
1063         fuse_reply_err(req, 0);
1064     else
1065         fuse_reply_err(req, errno);
1066 }
1067
1068 static void ft_ll_fsync(fuse_req_t req, fuse_ino_t ino, int datasync,
1069                           struct fuse_file_info *fi)
1070 {
1071     trace_lock.Lock();
1072     print_time();
1073     traceout << "ll_fsync" << endl << fi->fh << endl;
1074     trace_lock.Unlock();
1075
1076     int res = ::fsync(fi->fh);
1077     if (res >= 0)
1078         fuse_reply_err(req, 0);
1079     else
1080         fuse_reply_err(req, errno);
1081 }
1082
1083 static struct fuse_lowlevel_ops ft_ll_oper = {
1084  init: 0,
1085  destroy: 0,
1086  lookup: ft_ll_lookup,
1087  forget: ft_ll_forget,
1088  getattr: ft_ll_getattr,
1089  setattr: ft_ll_setattr,
1090  readlink: ft_ll_readlink,
1091  mknod: ft_ll_mknod,
1092  mkdir: ft_ll_mkdir,
1093  unlink: ft_ll_unlink,
1094  rmdir: ft_ll_rmdir,
1095  symlink: ft_ll_symlink,
1096  rename: ft_ll_rename,
1097  link: ft_ll_link,
1098  open: ft_ll_open,
1099  read: ft_ll_read,
1100  write: ft_ll_write,
1101  flush: ft_ll_flush,
1102  release: ft_ll_release,
1103  fsync: ft_ll_fsync,
1104  opendir: ft_ll_opendir,
1105  readdir: ft_ll_readdir,
1106  releasedir: ft_ll_releasedir,
1107  fsyncdir: 0,
1108  statfs: ft_ll_statfs,
1109  setxattr: 0,
1110  getxattr: 0,
1111  listxattr: 0,
1112  removexattr: 0,
1113  access: 0,
1114  create: ft_ll_create,
1115  getlk: 0,
1116  setlk: 0,
1117  bmap: 0
1118 };
1119
1120 int main(int argc, char *argv[])
1121 {
1122     // open trace
1123
1124     // figure base dir
1125     char *newargv[100];
1126     int newargc = 0;
1127     for (int i=0; i<argc; i++) {
1128         if (strcmp(argv[i], "--basedir") == 0) {
1129             basedir = argv[++i];
1130         } else if (strcmp(argv[i], "--timestamps") == 0) {
1131             do_timestamps = atoi(argv[++i]);
1132         } else if (strcmp(argv[i], "--trace") == 0) {
1133             tracefile.open(argv[++i], ios::out|ios::trunc);
1134             if (!tracefile.is_open())
1135                 cerr << "** couldn't open trace file " << argv[i] << endl;
1136         } else if (strcmp(argv[i], "--debug") == 0) {
1137             debug = 1;
1138         } else {
1139             cout << "arg: " << newargc << " " << argv[i] << endl;
1140             newargv[newargc++] = argv[i];
1141         }
1142     }
1143     newargv[newargc++] = "-o";
1144     newargv[newargc++] = "allow_other";
1145     //    newargv[newargc++] = "-o";
1146     //    newargv[newargc++] = "default_permissions";
1147     if (!basedir) return 1;
1148     cout << "basedir is " << basedir << endl;
1149
1150     // create root ino
1151     root = new Inode;
1152     ::lstat(basedir, &root->stbuf);
1153     root->stbuf.st_ino = 1;
1154     inode_map[1] = root;
1155     root->ref++;
1156
1157     umask(0);
1158
1159     // go go gadget fuse
1160     struct fuse_args args = FUSE_ARGS_INIT(newargc, newargv);
1161     struct fuse_chan *ch;
1162     char *mountpoint;
1163
1164     if (fuse_parse_cmdline(&args, &mountpoint, NULL, NULL) != -1 &&
1165         (ch = fuse_mount(mountpoint, &args)) != NULL) {
1166         struct fuse_session *se;
1167
1168         // init fuse
1169         se = fuse_lowlevel_new(&args, &ft_ll_oper, sizeof(ft_ll_oper),
1170                                NULL);
1171         if (se != NULL) {
1172             if (fuse_set_signal_handlers(se) != -1) {
1173                 fuse_session_add_chan(se, ch);
1174                 if (fuse_session_loop(se) <= -1) {
1175                     cout << "Failed fuse_session_loop() call." << endl;
1176                     return 1;
1177                 }
1178                 fuse_remove_signal_handlers(se);
1179                 fuse_session_remove_chan(ch);
1180             }
1181             fuse_session_destroy(se);
1182         }
1183         fuse_unmount(mountpoint, ch);
1184     }
1185     fuse_opt_free_args(&args);
1186 }