ceph/src/client/fuse_ll.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #include <sys/file.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <signal.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25
  26 // ceph
  27 #include "common/errno.h"
  28 #include "common/safe_io.h"
  29 #include "include/types.h"
  30 #include "Client.h"
  31 #include "Fh.h"
  32 #include "ioctl.h"
  33 #include "common/config.h"
  34 #include "include/assert.h"
  35 #include "include/cephfs/ceph_statx.h"
  36
  37 #include "fuse_ll.h"
  38 #include <fuse.h>
  39 #include <fuse_lowlevel.h>
  40
  41 #define dout_context g_ceph_context
  42
  43 #define FINO_INO(x) ((x) & ((1ull<<48)-1ull))
  44 #define FINO_STAG(x) ((x) >> 48)
  45 #define MAKE_FINO(i,s) ((i) | ((s) << 48))
  46
  47 #define MINORBITS       20
  48 #define MINORMASK       ((1U << MINORBITS) - 1)
  49
  50 #define MAJOR(dev)      ((unsigned int) ((dev) >> MINORBITS))
  51 #define MINOR(dev)      ((unsigned int) ((dev) & MINORMASK))
  52 #define MKDEV(ma,mi)    (((ma) << MINORBITS) | (mi))
  53
  54 static uint32_t new_encode_dev(dev_t dev)
  55 {
  56         unsigned major = MAJOR(dev);
  57         unsigned minor = MINOR(dev);
  58         return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
  59 }
  60
  61 static dev_t new_decode_dev(uint32_t dev)
  62 {
  63         unsigned major = (dev & 0xfff00) >> 8;
  64         unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
  65         return MKDEV(major, minor);
  66 }
  67
  68 class CephFuse::Handle {
  69 public:
  70   Handle(Client *c, int fd);
  71   ~Handle();
  72
  73   int init(int argc, const char *argv[]);
  74   int start();
  75   int loop();
  76   void finalize();
  77
  78   uint64_t fino_snap(uint64_t fino);
  79   uint64_t make_fake_ino(inodeno_t ino, snapid_t snapid);
  80   Inode * iget(fuse_ino_t fino);
  81   void iput(Inode *in);
  82
  83   int fd_on_success;
  84   Client *client;
  85
  86   struct fuse_chan *ch;
  87   struct fuse_session *se;
  88   char *mountpoint;
  89
  90   Mutex stag_lock;
  91   int last_stag;
  92
  93   ceph::unordered_map<uint64_t,int> snap_stag_map;
  94   ceph::unordered_map<int,uint64_t> stag_snap_map;
  95
  96   pthread_key_t fuse_req_key;
  97   void set_fuse_req(fuse_req_t);
  98   fuse_req_t get_fuse_req();
  99
 100   struct fuse_args args;
 101 };
 102
 103 static int getgroups(fuse_req_t req, gid_t **sgids)
 104 {
 105 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
 106   assert(sgids);
 107   int c = fuse_req_getgroups(req, 0, NULL);
 108   if (c < 0) {
 109     return c;
 110   }
 111   if (c == 0) {
 112     return 0;
 113   }
 114
 115   gid_t *gids = new (std::nothrow) gid_t[c];
 116   if (!gids) {
 117     return -ENOMEM;
 118   }
 119   c = fuse_req_getgroups(req, c, gids);
 120   if (c < 0) {
 121     delete gids;
 122   } else {
 123     *sgids = gids;
 124   }
 125   return c;
 126 #endif
 127   return -ENOSYS;
 128 }
 129
 130 static int getgroups_cb(void *handle, gid_t **sgids)
 131 {
 132   CephFuse::Handle *cfuse = (CephFuse::Handle *) handle;
 133   fuse_req_t req = cfuse->get_fuse_req();
 134   return getgroups(req, sgids);
 135 }
 136
 137 #define GET_GROUPS(perms, req)  {                               \
 138   if (cfuse->client->cct->_conf->fuse_set_user_groups) {        \
 139     gid_t *gids = NULL;                                         \
 140     int count = getgroups(req, &gids);                          \
 141     perms.init_gids(gids, count);                               \
 142     perms.take_gids();                                          \
 143   } }
 144
 145
 146 static CephFuse::Handle *fuse_ll_req_prepare(fuse_req_t req)
 147 {
 148   CephFuse::Handle *cfuse = (CephFuse::Handle *)fuse_req_userdata(req);
 149   cfuse->set_fuse_req(req);
 150   return cfuse;
 151 }
 152
 153 static void fuse_ll_lookup(fuse_req_t req, fuse_ino_t parent, const char *name)
 154 {
 155   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 156   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 157   struct fuse_entry_param fe;
 158   Inode *i2, *i1 = cfuse->iget(parent); // see below
 159   int r;
 160   UserPerm perms(ctx->uid, ctx->gid);
 161   GET_GROUPS(perms, req);
 162
 163   memset(&fe, 0, sizeof(fe));
 164   r = cfuse->client->ll_lookup(i1, name, &fe.attr, &i2, perms);
 165   if (r >= 0) {
 166     fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
 167     fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
 168     fuse_reply_entry(req, &fe);
 169   } else {
 170     fuse_reply_err(req, -r);
 171   }
 172
 173   // XXX NB, we dont iput(i2) because FUSE will do so in a matching
 174   // fuse_ll_forget()
 175   cfuse->iput(i1);
 176 }
 177
 178 static void fuse_ll_forget(fuse_req_t req, fuse_ino_t ino,
 179                            long unsigned nlookup)
 180 {
 181   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 182   cfuse->client->ll_forget(cfuse->iget(ino), nlookup+1);
 183   fuse_reply_none(req);
 184 }
 185
 186 static void fuse_ll_getattr(fuse_req_t req, fuse_ino_t ino,
 187                             struct fuse_file_info *fi)
 188 {
 189   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 190   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 191   Inode *in = cfuse->iget(ino);
 192   struct stat stbuf;
 193   UserPerm perms(ctx->uid, ctx->gid);
 194   GET_GROUPS(perms, req);
 195
 196   (void) fi; // XXX
 197
 198   if (cfuse->client->ll_getattr(in, &stbuf, perms)
 199       == 0) {
 200     stbuf.st_ino = cfuse->make_fake_ino(stbuf.st_ino, stbuf.st_dev);
 201     stbuf.st_rdev = new_encode_dev(stbuf.st_rdev);
 202     fuse_reply_attr(req, &stbuf, 0);
 203   } else
 204     fuse_reply_err(req, ENOENT);
 205
 206   cfuse->iput(in); // iput required
 207 }
 208
 209 static void fuse_ll_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
 210                             int to_set, struct fuse_file_info *fi)
 211 {
 212   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 213   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 214   Inode *in = cfuse->iget(ino);
 215   UserPerm perms(ctx->uid, ctx->gid);
 216   GET_GROUPS(perms, req);
 217
 218   int mask = 0;
 219   if (to_set & FUSE_SET_ATTR_MODE) mask |= CEPH_SETATTR_MODE;
 220   if (to_set & FUSE_SET_ATTR_UID) mask |= CEPH_SETATTR_UID;
 221   if (to_set & FUSE_SET_ATTR_GID) mask |= CEPH_SETATTR_GID;
 222   if (to_set & FUSE_SET_ATTR_MTIME) mask |= CEPH_SETATTR_MTIME;
 223   if (to_set & FUSE_SET_ATTR_ATIME) mask |= CEPH_SETATTR_ATIME;
 224   if (to_set & FUSE_SET_ATTR_SIZE) mask |= CEPH_SETATTR_SIZE;
 225 #if !defined(DARWIN)
 226   if (to_set & FUSE_SET_ATTR_MTIME_NOW) mask |= CEPH_SETATTR_MTIME_NOW;
 227   if (to_set & FUSE_SET_ATTR_ATIME_NOW) mask |= CEPH_SETATTR_ATIME_NOW;
 228 #endif
 229
 230   int r = cfuse->client->ll_setattr(in, attr, mask, perms);
 231   if (r == 0)
 232     fuse_reply_attr(req, attr, 0);
 233   else
 234     fuse_reply_err(req, -r);
 235
 236   cfuse->iput(in); // iput required
 237 }
 238
 239 // XATTRS
 240
 241 static void fuse_ll_setxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
 242                              const char *value, size_t size,
 243                              int flags
 244 #if defined(DARWIN)
 245                              ,uint32_t pos
 246 #endif
 247   )
 248 {
 249   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 250   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 251   Inode *in = cfuse->iget(ino);
 252   UserPerm perms(ctx->uid, ctx->gid);
 253   GET_GROUPS(perms, req);
 254
 255   int r = cfuse->client->ll_setxattr(in, name, value, size, flags, perms);
 256   fuse_reply_err(req, -r);
 257
 258   cfuse->iput(in); // iput required
 259 }
 260
 261 static void fuse_ll_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size)
 262 {
 263   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 264   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 265   Inode *in = cfuse->iget(ino);
 266   char buf[size];
 267   UserPerm perms(ctx->uid, ctx->gid);
 268   GET_GROUPS(perms, req);
 269
 270   int r = cfuse->client->ll_listxattr(in, buf, size, perms);
 271   if (size == 0 && r >= 0)
 272     fuse_reply_xattr(req, r);
 273   else if (r >= 0)
 274     fuse_reply_buf(req, buf, r);
 275   else
 276     fuse_reply_err(req, -r);
 277
 278   cfuse->iput(in); // iput required
 279 }
 280
 281 static void fuse_ll_getxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
 282                              size_t size
 283 #if defined(DARWIN)
 284                              ,uint32_t position
 285 #endif
 286   )
 287 {
 288   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 289   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 290   Inode *in = cfuse->iget(ino);
 291   char buf[size];
 292   UserPerm perms(ctx->uid, ctx->gid);
 293   GET_GROUPS(perms, req);
 294
 295   int r = cfuse->client->ll_getxattr(in, name, buf, size, perms);
 296   if (size == 0 && r >= 0)
 297     fuse_reply_xattr(req, r);
 298   else if (r >= 0)
 299     fuse_reply_buf(req, buf, r);
 300   else
 301     fuse_reply_err(req, -r);
 302
 303   cfuse->iput(in); // iput required
 304 }
 305
 306 static void fuse_ll_removexattr(fuse_req_t req, fuse_ino_t ino,
 307                                 const char *name)
 308 {
 309   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 310   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 311   Inode *in = cfuse->iget(ino);
 312   UserPerm perms(ctx->uid, ctx->gid);
 313   GET_GROUPS(perms, req);
 314
 315   int r = cfuse->client->ll_removexattr(in, name, perms);
 316   fuse_reply_err(req, -r);
 317
 318   cfuse->iput(in); // iput required
 319 }
 320
 321 static void fuse_ll_opendir(fuse_req_t req, fuse_ino_t ino,
 322                             struct fuse_file_info *fi)
 323 {
 324   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 325   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 326   Inode *in = cfuse->iget(ino);
 327   void *dirp;
 328
 329   UserPerm perms(ctx->uid, ctx->gid);
 330   GET_GROUPS(perms, req);
 331
 332   int r = cfuse->client->ll_opendir(in, fi->flags, (dir_result_t **)&dirp,
 333                                     perms);
 334   if (r >= 0) {
 335     fi->fh = (uint64_t)dirp;
 336     fuse_reply_open(req, fi);
 337   } else {
 338     fuse_reply_err(req, -r);
 339   }
 340
 341   cfuse->iput(in); // iput required
 342 }
 343
 344 static void fuse_ll_readlink(fuse_req_t req, fuse_ino_t ino)
 345 {
 346   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 347   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 348   Inode *in = cfuse->iget(ino);
 349   char buf[PATH_MAX + 1];  // leave room for a null terminator
 350   UserPerm perms(ctx->uid, ctx->gid);
 351   GET_GROUPS(perms, req);
 352
 353   int r = cfuse->client->ll_readlink(in, buf, sizeof(buf) - 1, perms);
 354   if (r >= 0) {
 355     buf[r] = '\0';
 356     fuse_reply_readlink(req, buf);
 357   } else {
 358     fuse_reply_err(req, -r);
 359   }
 360
 361   cfuse->iput(in); // iput required
 362 }
 363
 364 static void fuse_ll_mknod(fuse_req_t req, fuse_ino_t parent, const char *name,
 365                           mode_t mode, dev_t rdev)
 366 {
 367   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 368   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 369   Inode *i2, *i1 = cfuse->iget(parent);
 370   struct fuse_entry_param fe;
 371   UserPerm perms(ctx->uid, ctx->gid);
 372   GET_GROUPS(perms, req);
 373
 374   memset(&fe, 0, sizeof(fe));
 375
 376   int r = cfuse->client->ll_mknod(i1, name, mode, new_decode_dev(rdev),
 377                                   &fe.attr, &i2, perms);
 378   if (r == 0) {
 379     fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
 380     fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
 381     fuse_reply_entry(req, &fe);
 382   } else {
 383     fuse_reply_err(req, -r);
 384   }
 385
 386   // XXX NB, we dont iput(i2) because FUSE will do so in a matching
 387   // fuse_ll_forget()
 388   cfuse->iput(i1); // iput required
 389 }
 390
 391 static void fuse_ll_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name,
 392                           mode_t mode)
 393 {
 394   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 395   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 396   Inode *i2, *i1;
 397   struct fuse_entry_param fe;
 398
 399   memset(&fe, 0, sizeof(fe));
 400   UserPerm perm(ctx->uid, ctx->gid);
 401   GET_GROUPS(perm, req);
 402 #ifdef HAVE_SYS_SYNCFS
 403   if (cfuse->fino_snap(parent) == CEPH_SNAPDIR &&
 404       cfuse->client->cct->_conf->fuse_multithreaded &&
 405       cfuse->client->cct->_conf->fuse_syncfs_on_mksnap) {
 406     int err = 0;
 407     int fd = ::open(cfuse->mountpoint, O_RDONLY | O_DIRECTORY);
 408     if (fd < 0) {
 409       err = errno;
 410     } else {
 411       int r = ::syncfs(fd);
 412       if (r < 0)
 413         err = errno;
 414       ::close(fd);
 415     }
 416     if (err) {
 417       fuse_reply_err(req, err);
 418       return;
 419     }
 420   }
 421 #endif
 422
 423   i1 = cfuse->iget(parent);
 424   int r = cfuse->client->ll_mkdir(i1, name, mode, &fe.attr, &i2, perm);
 425   if (r == 0) {
 426     fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
 427     fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
 428     fuse_reply_entry(req, &fe);
 429   } else {
 430     fuse_reply_err(req, -r);
 431   }
 432
 433   // XXX NB, we dont iput(i2) because FUSE will do so in a matching
 434   // fuse_ll_forget()
 435   cfuse->iput(i1); // iput required
 436 }
 437
 438 static void fuse_ll_unlink(fuse_req_t req, fuse_ino_t parent, const char *name)
 439 {
 440   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 441   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 442   Inode *in = cfuse->iget(parent);
 443   UserPerm perm(ctx->uid, ctx->gid);
 444   GET_GROUPS(perm, req);
 445
 446   int r = cfuse->client->ll_unlink(in, name, perm);
 447   fuse_reply_err(req, -r);
 448
 449   cfuse->iput(in); // iput required
 450 }
 451
 452 static void fuse_ll_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name)
 453 {
 454   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 455   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 456   Inode *in = cfuse->iget(parent);
 457   UserPerm perms(ctx->uid, ctx->gid);
 458   GET_GROUPS(perms, req);
 459
 460   int r = cfuse->client->ll_rmdir(in, name, perms);
 461   fuse_reply_err(req, -r);
 462
 463   cfuse->iput(in); // iput required
 464 }
 465
 466 static void fuse_ll_symlink(fuse_req_t req, const char *existing,
 467                             fuse_ino_t parent, const char *name)
 468 {
 469   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 470   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 471   Inode *i2, *i1 = cfuse->iget(parent);
 472   struct fuse_entry_param fe;
 473   UserPerm perms(ctx->uid, ctx->gid);
 474   GET_GROUPS(perms, req);
 475
 476   memset(&fe, 0, sizeof(fe));
 477
 478   int r = cfuse->client->ll_symlink(i1, name, existing, &fe.attr, &i2, perms);
 479   if (r == 0) {
 480     fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
 481     fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
 482     fuse_reply_entry(req, &fe);
 483   } else {
 484     fuse_reply_err(req, -r);
 485   }
 486
 487   // XXX NB, we dont iput(i2) because FUSE will do so in a matching
 488   // fuse_ll_forget()
 489   cfuse->iput(i1); // iput required
 490 }
 491
 492 static void fuse_ll_rename(fuse_req_t req, fuse_ino_t parent, const char *name,
 493                            fuse_ino_t newparent, const char *newname)
 494 {
 495   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 496   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 497   Inode *in = cfuse->iget(parent);
 498   Inode *nin = cfuse->iget(newparent);
 499   UserPerm perm(ctx->uid, ctx->gid);
 500   GET_GROUPS(perm, req);
 501
 502   int r = cfuse->client->ll_rename(in, name, nin, newname, perm);
 503   fuse_reply_err(req, -r);
 504
 505   cfuse->iput(in); // iputs required
 506   cfuse->iput(nin);
 507 }
 508
 509 static void fuse_ll_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent,
 510                          const char *newname)
 511 {
 512   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 513   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 514   Inode *in = cfuse->iget(ino);
 515   Inode *nin = cfuse->iget(newparent);
 516   struct fuse_entry_param fe;
 517
 518   memset(&fe, 0, sizeof(fe));
 519   UserPerm perm(ctx->uid, ctx->gid);
 520   GET_GROUPS(perm, req);
 521
 522   /*
 523    * Note that we could successfully link, but then fail the subsequent
 524    * getattr and return an error. Perhaps we should ignore getattr errors,
 525    * but then how do we tell FUSE that the attrs are bogus?
 526    */
 527   int r = cfuse->client->ll_link(in, nin, newname, perm);
 528   if (r == 0) {
 529     r = cfuse->client->ll_getattr(in, &fe.attr, perm);
 530     if (r == 0) {
 531       fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
 532       fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
 533       fuse_reply_entry(req, &fe);
 534     }
 535   }
 536
 537   if (r != 0) {
 538     /*
 539      * Many ll operations in libcephfs return an extra inode reference, but
 540      * ll_link currently does not. Still, FUSE needs one for the new dentry,
 541      * so we commandeer the reference taken earlier when ll_link is successful.
 542      * On error however, we must put that reference.
 543      */
 544     cfuse->iput(in);
 545     fuse_reply_err(req, -r);
 546   }
 547
 548   cfuse->iput(nin);
 549 }
 550
 551 static void fuse_ll_open(fuse_req_t req, fuse_ino_t ino,
 552                          struct fuse_file_info *fi)
 553 {
 554   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 555   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 556   Inode *in = cfuse->iget(ino);
 557   Fh *fh = NULL;
 558   UserPerm perms(ctx->uid, ctx->gid);
 559   GET_GROUPS(perms, req);
 560
 561   int r = cfuse->client->ll_open(in, fi->flags, &fh, perms);
 562   if (r == 0) {
 563     fi->fh = (uint64_t)fh;
 564 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
 565     if (cfuse->client->cct->_conf->fuse_disable_pagecache)
 566       fi->direct_io = 1;
 567     else if (cfuse->client->cct->_conf->fuse_use_invalidate_cb)
 568       fi->keep_cache = 1;
 569 #endif
 570     fuse_reply_open(req, fi);
 571   } else {
 572     fuse_reply_err(req, -r);
 573   }
 574
 575   cfuse->iput(in); // iput required
 576 }
 577
 578 static void fuse_ll_read(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off,
 579                          struct fuse_file_info *fi)
 580 {
 581   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 582   Fh *fh = reinterpret_cast<Fh*>(fi->fh);
 583   bufferlist bl;
 584   int r = cfuse->client->ll_read(fh, off, size, &bl);
 585   if (r >= 0)
 586     fuse_reply_buf(req, bl.c_str(), bl.length());
 587   else
 588     fuse_reply_err(req, -r);
 589 }
 590
 591 static void fuse_ll_write(fuse_req_t req, fuse_ino_t ino, const char *buf,
 592                            size_t size, off_t off, struct fuse_file_info *fi)
 593 {
 594   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 595   Fh *fh = reinterpret_cast<Fh*>(fi->fh);
 596   int r = cfuse->client->ll_write(fh, off, size, buf);
 597   if (r >= 0)
 598     fuse_reply_write(req, r);
 599   else
 600     fuse_reply_err(req, -r);
 601 }
 602
 603 static void fuse_ll_flush(fuse_req_t req, fuse_ino_t ino,
 604                           struct fuse_file_info *fi)
 605 {
 606   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 607   Fh *fh = reinterpret_cast<Fh*>(fi->fh);
 608   int r = cfuse->client->ll_flush(fh);
 609   fuse_reply_err(req, -r);
 610 }
 611
 612 #ifdef FUSE_IOCTL_COMPAT
 613 static void fuse_ll_ioctl(fuse_req_t req, fuse_ino_t ino, int cmd, void *arg, struct fuse_file_info *fi,
 614                           unsigned flags, const void *in_buf, size_t in_bufsz, size_t out_bufsz)
 615 {
 616   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 617
 618   if (flags & FUSE_IOCTL_COMPAT) {
 619     fuse_reply_err(req, ENOSYS);
 620     return;
 621   }
 622
 623   switch (static_cast<unsigned>(cmd)) {
 624     case CEPH_IOC_GET_LAYOUT: {
 625       file_layout_t layout;
 626       struct ceph_ioctl_layout l;
 627       Fh *fh = (Fh*)fi->fh;
 628       cfuse->client->ll_file_layout(fh, &layout);
 629       l.stripe_unit = layout.stripe_unit;
 630       l.stripe_count = layout.stripe_count;
 631       l.object_size = layout.object_size;
 632       l.data_pool = layout.pool_id;
 633       fuse_reply_ioctl(req, 0, &l, sizeof(struct ceph_ioctl_layout));
 634     }
 635     break;
 636     default:
 637       fuse_reply_err(req, EINVAL);
 638   }
 639 }
 640 #endif
 641
 642 #if FUSE_VERSION > FUSE_MAKE_VERSION(2, 9)
 643
 644 static void fuse_ll_fallocate(fuse_req_t req, fuse_ino_t ino, int mode,
 645                               off_t offset, off_t length,
 646                               struct fuse_file_info *fi)
 647 {
 648   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 649   Fh *fh = (Fh*)fi->fh;
 650   int r = cfuse->client->ll_fallocate(fh, mode, offset, length);
 651   fuse_reply_err(req, -r);
 652 }
 653
 654 #endif
 655
 656 static void fuse_ll_release(fuse_req_t req, fuse_ino_t ino,
 657                             struct fuse_file_info *fi)
 658 {
 659   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 660   Fh *fh = reinterpret_cast<Fh*>(fi->fh);
 661   int r = cfuse->client->ll_release(fh);
 662   fuse_reply_err(req, -r);
 663 }
 664
 665 static void fuse_ll_fsync(fuse_req_t req, fuse_ino_t ino, int datasync,
 666                           struct fuse_file_info *fi)
 667 {
 668   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 669   Fh *fh = reinterpret_cast<Fh*>(fi->fh);
 670   int r = cfuse->client->ll_fsync(fh, datasync);
 671   fuse_reply_err(req, -r);
 672 }
 673
 674 struct readdir_context {
 675   fuse_req_t req;
 676   char *buf;
 677   size_t size;
 678   size_t pos; /* in buf */
 679   uint64_t snap;
 680 };
 681
 682 /*
 683  * return 0 on success, -1 if out of space
 684  */
 685 static int fuse_ll_add_dirent(void *p, struct dirent *de,
 686                               struct ceph_statx *stx, off_t next_off,
 687                               Inode *in)
 688 {
 689   struct readdir_context *c = (struct readdir_context *)p;
 690   CephFuse::Handle *cfuse = (CephFuse::Handle *)fuse_req_userdata(c->req);
 691
 692   struct stat st;
 693   st.st_ino = cfuse->make_fake_ino(stx->stx_ino, c->snap);
 694   st.st_mode = stx->stx_mode;
 695   st.st_rdev = new_encode_dev(stx->stx_rdev);
 696
 697   size_t room = c->size - c->pos;
 698   size_t entrysize = fuse_add_direntry(c->req, c->buf + c->pos, room,
 699                                        de->d_name, &st, next_off);
 700   if (entrysize > room)
 701     return -ENOSPC;
 702
 703   /* success */
 704   c->pos += entrysize;
 705   return 0;
 706 }
 707
 708 static void fuse_ll_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
 709                             off_t off, struct fuse_file_info *fi)
 710 {
 711   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 712
 713   dir_result_t *dirp = reinterpret_cast<dir_result_t*>(fi->fh);
 714   cfuse->client->seekdir(dirp, off);
 715
 716   struct readdir_context rc;
 717   rc.req = req;
 718   rc.buf = new char[size];
 719   rc.size = size;
 720   rc.pos = 0;
 721   rc.snap = cfuse->fino_snap(ino);
 722
 723   int r = cfuse->client->readdir_r_cb(dirp, fuse_ll_add_dirent, &rc);
 724   if (r == 0 || r == -ENOSPC)  /* ignore ENOSPC from our callback */
 725     fuse_reply_buf(req, rc.buf, rc.pos);
 726   else
 727     fuse_reply_err(req, -r);
 728   delete[] rc.buf;
 729 }
 730
 731 static void fuse_ll_releasedir(fuse_req_t req, fuse_ino_t ino,
 732                                struct fuse_file_info *fi)
 733 {
 734   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 735   dir_result_t *dirp = reinterpret_cast<dir_result_t*>(fi->fh);
 736   cfuse->client->ll_releasedir(dirp);
 737   fuse_reply_err(req, 0);
 738 }
 739
 740 static void fuse_ll_fsyncdir(fuse_req_t req, fuse_ino_t ino, int datasync,
 741                              struct fuse_file_info *fi)
 742 {
 743   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 744   dir_result_t *dirp = reinterpret_cast<dir_result_t*>(fi->fh);
 745   int r = cfuse->client->ll_fsyncdir(dirp);
 746   fuse_reply_err(req, -r);
 747 }
 748
 749 static void fuse_ll_access(fuse_req_t req, fuse_ino_t ino, int mask)
 750 {
 751   fuse_reply_err(req, 0);
 752 }
 753
 754 static void fuse_ll_create(fuse_req_t req, fuse_ino_t parent, const char *name,
 755                            mode_t mode, struct fuse_file_info *fi)
 756 {
 757   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 758   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 759   Inode *i1 = cfuse->iget(parent), *i2;
 760   struct fuse_entry_param fe;
 761   Fh *fh = NULL;
 762   UserPerm perms(ctx->uid, ctx->gid);
 763   GET_GROUPS(perms, req);
 764
 765   memset(&fe, 0, sizeof(fe));
 766
 767   // pass &i2 for the created inode so that ll_create takes an initial ll_ref
 768   int r = cfuse->client->ll_create(i1, name, mode, fi->flags, &fe.attr, &i2,
 769                                    &fh, perms);
 770   if (r == 0) {
 771     fi->fh = (uint64_t)fh;
 772     fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
 773 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
 774     if (cfuse->client->cct->_conf->fuse_disable_pagecache)
 775       fi->direct_io = 1;
 776     else if (cfuse->client->cct->_conf->fuse_use_invalidate_cb)
 777       fi->keep_cache = 1;
 778 #endif
 779     fuse_reply_create(req, &fe, fi);
 780   } else
 781     fuse_reply_err(req, -r);
 782   // XXX NB, we dont iput(i2) because FUSE will do so in a matching
 783   // fuse_ll_forget()
 784   cfuse->iput(i1); // iput required
 785 }
 786
 787 static void fuse_ll_statfs(fuse_req_t req, fuse_ino_t ino)
 788 {
 789   struct statvfs stbuf;
 790   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 791   Inode *in = cfuse->iget(ino);
 792   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 793   UserPerm perms(ctx->uid, ctx->gid);
 794   GET_GROUPS(perms, req);
 795
 796   int r = cfuse->client->ll_statfs(in, &stbuf, perms);
 797   if (r == 0)
 798     fuse_reply_statfs(req, &stbuf);
 799   else
 800     fuse_reply_err(req, -r);
 801
 802   cfuse->iput(in); // iput required
 803 }
 804
 805 static void fuse_ll_getlk(fuse_req_t req, fuse_ino_t ino,
 806                           struct fuse_file_info *fi, struct flock *lock)
 807 {
 808   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 809   Fh *fh = reinterpret_cast<Fh*>(fi->fh);
 810
 811   int r = cfuse->client->ll_getlk(fh, lock, fi->lock_owner);
 812   if (r == 0)
 813     fuse_reply_lock(req, lock);
 814   else
 815     fuse_reply_err(req, -r);
 816 }
 817
 818 static void fuse_ll_setlk(fuse_req_t req, fuse_ino_t ino,
 819                           struct fuse_file_info *fi, struct flock *lock, int sleep)
 820 {
 821   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 822   Fh *fh = reinterpret_cast<Fh*>(fi->fh);
 823
 824   // must use multithread if operation may block
 825   if (!cfuse->client->cct->_conf->fuse_multithreaded &&
 826       sleep && lock->l_type != F_UNLCK) {
 827     fuse_reply_err(req, EDEADLK);
 828     return;
 829   }
 830
 831   int r = cfuse->client->ll_setlk(fh, lock, fi->lock_owner, sleep);
 832   fuse_reply_err(req, -r);
 833 }
 834
 835 static void fuse_ll_interrupt(fuse_req_t req, void* data)
 836 {
 837   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 838   cfuse->client->ll_interrupt(data);
 839 }
 840
 841 static void switch_interrupt_cb(void *handle, void* data)
 842 {
 843   CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
 844   fuse_req_t req = cfuse->get_fuse_req();
 845
 846   if (data)
 847     fuse_req_interrupt_func(req, fuse_ll_interrupt, data);
 848   else
 849     fuse_req_interrupt_func(req, NULL, NULL);
 850 }
 851
 852 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
 853 static void fuse_ll_flock(fuse_req_t req, fuse_ino_t ino,
 854                           struct fuse_file_info *fi, int cmd)
 855 {
 856   CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
 857   Fh *fh = (Fh*)fi->fh;
 858
 859   // must use multithread if operation may block
 860   if (!cfuse->client->cct->_conf->fuse_multithreaded &&
 861       !(cmd & (LOCK_NB | LOCK_UN))) {
 862     fuse_reply_err(req, EDEADLK);
 863     return;
 864   }
 865
 866   int r = cfuse->client->ll_flock(fh, cmd, fi->lock_owner);
 867   fuse_reply_err(req, -r);
 868 }
 869 #endif
 870
 871 #if !defined(DARWIN)
 872 static mode_t umask_cb(void *handle)
 873 {
 874   CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
 875   fuse_req_t req = cfuse->get_fuse_req();
 876   const struct fuse_ctx *ctx = fuse_req_ctx(req);
 877   return ctx->umask;
 878 }
 879 #endif
 880
 881 static void ino_invalidate_cb(void *handle, vinodeno_t vino, int64_t off,
 882                               int64_t len)
 883 {
 884 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
 885   CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
 886   fuse_ino_t fino = cfuse->make_fake_ino(vino.ino, vino.snapid);
 887   fuse_lowlevel_notify_inval_inode(cfuse->ch, fino, off, len);
 888 #endif
 889 }
 890
 891 static void dentry_invalidate_cb(void *handle, vinodeno_t dirino,
 892                                  vinodeno_t ino, string& name)
 893 {
 894   CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
 895   fuse_ino_t fdirino = cfuse->make_fake_ino(dirino.ino, dirino.snapid);
 896 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
 897   fuse_ino_t fino = 0;
 898   if (ino.ino != inodeno_t())
 899     fino = cfuse->make_fake_ino(ino.ino, ino.snapid);
 900   fuse_lowlevel_notify_delete(cfuse->ch, fdirino, fino, name.c_str(), name.length());
 901 #elif FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
 902   fuse_lowlevel_notify_inval_entry(cfuse->ch, fdirino, name.c_str(), name.length());
 903 #endif
 904 }
 905
 906 static int remount_cb(void *handle)
 907 {
 908   // used for trimming kernel dcache. when remounting a file system, linux kernel
 909   // trims all unused dentries in the file system
 910   char cmd[1024];
 911   CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
 912   snprintf(cmd, sizeof(cmd), "mount -i -o remount %s", cfuse->mountpoint);
 913   int r = system(cmd);
 914   if (r != 0 && r != -1) {
 915     r = WEXITSTATUS(r);
 916   }
 917
 918   return r;
 919 }
 920
 921 static void do_init(void *data, fuse_conn_info *conn)
 922 {
 923   CephFuse::Handle *cfuse = (CephFuse::Handle *)data;
 924   Client *client = cfuse->client;
 925
 926 #if !defined(DARWIN)
 927   if (!client->cct->_conf->fuse_default_permissions &&
 928       client->ll_handle_umask()) {
 929     // apply umask in userspace if posix acl is enabled
 930     if(conn->capable & FUSE_CAP_DONT_MASK)
 931       conn->want |= FUSE_CAP_DONT_MASK;
 932   }
 933 #endif
 934
 935   if (cfuse->fd_on_success) {
 936     //cout << "fuse init signaling on fd " << fd_on_success << std::endl;
 937     // see Preforker::daemonize(), ceph-fuse's parent process expects a `-1`
 938     // from a daemonized child process.
 939     uint32_t r = -1;
 940     int err = safe_write(cfuse->fd_on_success, &r, sizeof(r));
 941     if (err) {
 942       derr << "fuse_ll: do_init: safe_write failed with error "
 943            << cpp_strerror(err) << dendl;
 944       ceph_abort();
 945     }
 946     //cout << "fuse init done signaling on fd " << fd_on_success << std::endl;
 947
 948     // close stdout, etc.
 949     ::close(0);
 950     ::close(1);
 951     ::close(2);
 952   }
 953 }
 954
 955 const static struct fuse_lowlevel_ops fuse_ll_oper = {
 956  init: do_init,
 957  destroy: 0,
 958  lookup: fuse_ll_lookup,
 959  forget: fuse_ll_forget,
 960  getattr: fuse_ll_getattr,
 961  setattr: fuse_ll_setattr,
 962  readlink: fuse_ll_readlink,
 963  mknod: fuse_ll_mknod,
 964  mkdir: fuse_ll_mkdir,
 965  unlink: fuse_ll_unlink,
 966  rmdir: fuse_ll_rmdir,
 967  symlink: fuse_ll_symlink,
 968  rename: fuse_ll_rename,
 969  link: fuse_ll_link,
 970  open: fuse_ll_open,
 971  read: fuse_ll_read,
 972  write: fuse_ll_write,
 973  flush: fuse_ll_flush,
 974  release: fuse_ll_release,
 975  fsync: fuse_ll_fsync,
 976  opendir: fuse_ll_opendir,
 977  readdir: fuse_ll_readdir,
 978  releasedir: fuse_ll_releasedir,
 979  fsyncdir: fuse_ll_fsyncdir,
 980  statfs: fuse_ll_statfs,
 981  setxattr: fuse_ll_setxattr,
 982  getxattr: fuse_ll_getxattr,
 983  listxattr: fuse_ll_listxattr,
 984  removexattr: fuse_ll_removexattr,
 985  access: fuse_ll_access,
 986  create: fuse_ll_create,
 987  getlk: fuse_ll_getlk,
 988  setlk: fuse_ll_setlk,
 989  bmap: 0,
 990 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
 991 #ifdef FUSE_IOCTL_COMPAT
 992  ioctl: fuse_ll_ioctl,
 993 #else
 994  ioctl: 0,
 995 #endif
 996  poll: 0,
 997 #endif
 998 #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
 999  write_buf: 0,
1000  retrieve_reply: 0,
1001  forget_multi: 0,
1002  flock: fuse_ll_flock,
1003 #endif
1004 #if FUSE_VERSION > FUSE_MAKE_VERSION(2, 9)
1005  fallocate: fuse_ll_fallocate
1006 #endif
1007 };
1008
1009
1010 CephFuse::Handle::Handle(Client *c, int fd) :
1011   fd_on_success(fd),
1012   client(c),
1013   ch(NULL),
1014   se(NULL),
1015   mountpoint(NULL),
1016   stag_lock("fuse_ll.cc stag_lock"),
1017   last_stag(0)
1018 {
1019   snap_stag_map[CEPH_NOSNAP] = 0;
1020   stag_snap_map[0] = CEPH_NOSNAP;
1021   memset(&args, 0, sizeof(args));
1022 }
1023
1024 CephFuse::Handle::~Handle()
1025 {
1026   fuse_opt_free_args(&args);
1027 }
1028
1029 void CephFuse::Handle::finalize()
1030 {
1031   if (se)
1032     fuse_remove_signal_handlers(se);
1033   if (ch)
1034     fuse_session_remove_chan(ch);
1035   if (se)
1036     fuse_session_destroy(se);
1037   if (ch)
1038     fuse_unmount(mountpoint, ch);
1039
1040   pthread_key_delete(fuse_req_key);
1041 }
1042
1043 int CephFuse::Handle::init(int argc, const char *argv[])
1044 {
1045
1046   int r = pthread_key_create(&fuse_req_key, NULL);
1047   if (r) {
1048     derr << "pthread_key_create failed." << dendl;
1049     return r;
1050   }
1051
1052   // set up fuse argc/argv
1053   int newargc = 0;
1054   const char **newargv = (const char **) malloc((argc + 10) * sizeof(char *));
1055   if(!newargv)
1056     return ENOMEM;
1057
1058   newargv[newargc++] = argv[0];
1059   newargv[newargc++] = "-f";  // stay in foreground
1060
1061   if (client->cct->_conf->fuse_allow_other) {
1062     newargv[newargc++] = "-o";
1063     newargv[newargc++] = "allow_other";
1064   }
1065   if (client->cct->_conf->fuse_default_permissions) {
1066     newargv[newargc++] = "-o";
1067     newargv[newargc++] = "default_permissions";
1068   }
1069 #if defined(__linux__)
1070   if (client->cct->_conf->fuse_big_writes) {
1071     newargv[newargc++] = "-o";
1072     newargv[newargc++] = "big_writes";
1073   }
1074   if (client->cct->_conf->fuse_atomic_o_trunc) {
1075     newargv[newargc++] = "-o";
1076     newargv[newargc++] = "atomic_o_trunc";
1077   }
1078 #endif
1079   if (client->cct->_conf->fuse_debug)
1080     newargv[newargc++] = "-d";
1081
1082   for (int argctr = 1; argctr < argc; argctr++)
1083     newargv[newargc++] = argv[argctr];
1084
1085   derr << "init, newargv = " << newargv << " newargc=" << newargc << dendl;
1086   struct fuse_args a = FUSE_ARGS_INIT(newargc, (char**)newargv);
1087   args = a;  // Roundabout construction b/c FUSE_ARGS_INIT is for initialization not assignment
1088
1089   if (fuse_parse_cmdline(&args, &mountpoint, NULL, NULL) == -1) {
1090     derr << "fuse_parse_cmdline failed." << dendl;
1091     fuse_opt_free_args(&args);
1092     free(newargv);
1093     return EINVAL;
1094   }
1095
1096   assert(args.allocated);  // Checking fuse has realloc'd args so we can free newargv
1097   free(newargv);
1098   return 0;
1099 }
1100
1101 int CephFuse::Handle::start()
1102 {
1103   ch = fuse_mount(mountpoint, &args);
1104   if (!ch) {
1105     derr << "fuse_mount(mountpoint=" << mountpoint << ") failed." << dendl;
1106     return EIO;
1107   }
1108
1109   se = fuse_lowlevel_new(&args, &fuse_ll_oper, sizeof(fuse_ll_oper), this);
1110   if (!se) {
1111     derr << "fuse_lowlevel_new failed" << dendl;
1112     return EDOM;
1113   }
1114
1115   signal(SIGTERM, SIG_DFL);
1116   signal(SIGINT, SIG_DFL);
1117   if (fuse_set_signal_handlers(se) == -1) {
1118     derr << "fuse_set_signal_handlers failed" << dendl;
1119     return ENOSYS;
1120   }
1121
1122   fuse_session_add_chan(se, ch);
1123
1124
1125   struct client_callback_args args = {
1126     handle: this,
1127     ino_cb: client->cct->_conf->fuse_use_invalidate_cb ? ino_invalidate_cb : NULL,
1128     dentry_cb: dentry_invalidate_cb,
1129     switch_intr_cb: switch_interrupt_cb,
1130 #if defined(__linux__)
1131     remount_cb: remount_cb,
1132 #endif
1133     getgroups_cb: getgroups_cb,
1134 #if !defined(DARWIN)
1135     umask_cb: umask_cb,
1136 #endif
1137   };
1138   client->ll_register_callbacks(&args);
1139
1140   return 0;
1141 }
1142
1143 int CephFuse::Handle::loop()
1144 {
1145   if (client->cct->_conf->fuse_multithreaded) {
1146     return fuse_session_loop_mt(se);
1147   } else {
1148     return fuse_session_loop(se);
1149   }
1150 }
1151
1152 uint64_t CephFuse::Handle::fino_snap(uint64_t fino)
1153 {
1154   if (fino == FUSE_ROOT_ID)
1155     return CEPH_NOSNAP;
1156
1157   if (client->use_faked_inos()) {
1158     vinodeno_t vino  = client->map_faked_ino(fino);
1159     return vino.snapid;
1160   } else {
1161     Mutex::Locker l(stag_lock);
1162     uint64_t stag = FINO_STAG(fino);
1163     assert(stag_snap_map.count(stag));
1164     return stag_snap_map[stag];
1165   }
1166 }
1167
1168 Inode * CephFuse::Handle::iget(fuse_ino_t fino)
1169 {
1170   if (fino == FUSE_ROOT_ID)
1171     return client->get_root();
1172
1173   if (client->use_faked_inos()) {
1174     return client->ll_get_inode((ino_t)fino);
1175   } else {
1176     vinodeno_t vino(FINO_INO(fino), fino_snap(fino));
1177     return client->ll_get_inode(vino);
1178   }
1179 }
1180
1181 void CephFuse::Handle::iput(Inode *in)
1182 {
1183     client->ll_put(in);
1184 }
1185
1186 uint64_t CephFuse::Handle::make_fake_ino(inodeno_t ino, snapid_t snapid)
1187 {
1188   if (client->use_faked_inos()) {
1189     // already faked by libcephfs
1190     if (ino == client->get_root_ino())
1191       return FUSE_ROOT_ID;
1192
1193     return ino;
1194   } else {
1195     if (snapid == CEPH_NOSNAP && ino == client->get_root_ino())
1196       return FUSE_ROOT_ID;
1197
1198     Mutex::Locker l(stag_lock);
1199     uint64_t stag;
1200     if (snap_stag_map.count(snapid) == 0) {
1201       stag = ++last_stag;
1202       snap_stag_map[snapid] = stag;
1203       stag_snap_map[stag] = snapid;
1204     } else
1205       stag = snap_stag_map[snapid];
1206     inodeno_t fino = MAKE_FINO(ino, stag);
1207     //cout << "make_fake_ino " << ino << "." << snapid << " -> " << fino << std::endl;
1208     return fino;
1209   }
1210 }
1211
1212 void CephFuse::Handle::set_fuse_req(fuse_req_t req)
1213 {
1214   pthread_setspecific(fuse_req_key, (void*)req);
1215 }
1216
1217 fuse_req_t CephFuse::Handle::get_fuse_req()
1218 {
1219   return (fuse_req_t) pthread_getspecific(fuse_req_key);
1220 }
1221
1222
1223 CephFuse::CephFuse(Client *c, int fd) : _handle(new CephFuse::Handle(c, fd))
1224 {
1225 }
1226
1227 CephFuse::~CephFuse()
1228 {
1229   delete _handle;
1230 }
1231
1232 int CephFuse::init(int argc, const char *argv[])
1233 {
1234   return _handle->init(argc, argv);
1235 }
1236
1237 int CephFuse::start()
1238 {
1239   return _handle->start();
1240 }
1241
1242 int CephFuse::loop()
1243 {
1244   return _handle->loop();
1245 }
1246
1247 void CephFuse::finalize()
1248 {
1249   return _handle->finalize();
1250 }
1251
1252 std::string CephFuse::get_mount_point() const
1253 {
1254   if (_handle->mountpoint) {
1255     return _handle->mountpoint;
1256   } else {
1257     return "";
1258   }
1259 }