X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fclient%2Ffuse_ll.cc;fp=src%2Fceph%2Fsrc%2Fclient%2Ffuse_ll.cc;h=d24ad5c3451a14a5211988510e313af7efd06589;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/client/fuse_ll.cc b/src/ceph/src/client/fuse_ll.cc
new file mode 100644
index 0000000..d24ad5c
--- /dev/null
+++ b/src/ceph/src/client/fuse_ll.cc
@@ -0,0 +1,1259 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include <sys/file.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+// ceph
+#include "common/errno.h"
+#include "common/safe_io.h"
+#include "include/types.h"
+#include "Client.h"
+#include "Fh.h"
+#include "ioctl.h"
+#include "common/config.h"
+#include "include/assert.h"
+#include "include/cephfs/ceph_statx.h"
+
+#include "fuse_ll.h"
+#include <fuse.h>
+#include <fuse_lowlevel.h>
+
+#define dout_context g_ceph_context
+
+#define FINO_INO(x) ((x) & ((1ull<<48)-1ull))
+#define FINO_STAG(x) ((x) >> 48)
+#define MAKE_FINO(i,s) ((i) | ((s) << 48))
+
+#define MINORBITS	20
+#define MINORMASK	((1U << MINORBITS) - 1)
+
+#define MAJOR(dev)	((unsigned int) ((dev) >> MINORBITS))
+#define MINOR(dev)	((unsigned int) ((dev) & MINORMASK))
+#define MKDEV(ma,mi)	(((ma) << MINORBITS) | (mi))
+
+static uint32_t new_encode_dev(dev_t dev)
+{
+	unsigned major = MAJOR(dev);
+	unsigned minor = MINOR(dev);
+	return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
+}
+
+static dev_t new_decode_dev(uint32_t dev)
+{
+	unsigned major = (dev & 0xfff00) >> 8;
+	unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
+	return MKDEV(major, minor);
+}
+
+class CephFuse::Handle {
+public:
+  Handle(Client *c, int fd);
+  ~Handle();
+
+  int init(int argc, const char *argv[]);
+  int start();
+  int loop();
+  void finalize();
+
+  uint64_t fino_snap(uint64_t fino);
+  uint64_t make_fake_ino(inodeno_t ino, snapid_t snapid);
+  Inode * iget(fuse_ino_t fino);
+  void iput(Inode *in);
+
+  int fd_on_success;
+  Client *client;
+
+  struct fuse_chan *ch;
+  struct fuse_session *se;
+  char *mountpoint;
+
+  Mutex stag_lock;
+  int last_stag;
+
+  ceph::unordered_map<uint64_t,int> snap_stag_map;
+  ceph::unordered_map<int,uint64_t> stag_snap_map;
+
+  pthread_key_t fuse_req_key;
+  void set_fuse_req(fuse_req_t);
+  fuse_req_t get_fuse_req();
+
+  struct fuse_args args;
+};
+
+static int getgroups(fuse_req_t req, gid_t **sgids)
+{
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
+  assert(sgids);
+  int c = fuse_req_getgroups(req, 0, NULL);
+  if (c < 0) {
+    return c;
+  }
+  if (c == 0) {
+    return 0;
+  }
+
+  gid_t *gids = new (std::nothrow) gid_t[c];
+  if (!gids) {
+    return -ENOMEM;
+  }
+  c = fuse_req_getgroups(req, c, gids);
+  if (c < 0) {
+    delete gids;
+  } else {
+    *sgids = gids;
+  }
+  return c;
+#endif
+  return -ENOSYS;
+}
+
+static int getgroups_cb(void *handle, gid_t **sgids)
+{
+  CephFuse::Handle *cfuse = (CephFuse::Handle *) handle;
+  fuse_req_t req = cfuse->get_fuse_req();
+  return getgroups(req, sgids);
+}
+
+#define GET_GROUPS(perms, req)	{				\
+  if (g_conf->get_val<bool>("fuse_set_user_groups")) {	\
+    gid_t *gids = NULL;						\
+    int count = getgroups(req, &gids);				\
+    perms.init_gids(gids, count);				\
+    perms.take_gids();						\
+  } }
+
+
+static CephFuse::Handle *fuse_ll_req_prepare(fuse_req_t req)
+{
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)fuse_req_userdata(req);
+  cfuse->set_fuse_req(req);
+  return cfuse;
+}
+
+static void fuse_ll_lookup(fuse_req_t req, fuse_ino_t parent, const char *name)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  struct fuse_entry_param fe;
+  Inode *i2, *i1 = cfuse->iget(parent); // see below
+  int r;
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  memset(&fe, 0, sizeof(fe));
+  r = cfuse->client->ll_lookup(i1, name, &fe.attr, &i2, perms);
+  if (r >= 0) {
+    fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
+    fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
+    fuse_reply_entry(req, &fe);
+  } else {
+    fuse_reply_err(req, -r);
+  }
+
+  // XXX NB, we dont iput(i2) because FUSE will do so in a matching
+  // fuse_ll_forget()
+  cfuse->iput(i1);
+}
+
+static void fuse_ll_forget(fuse_req_t req, fuse_ino_t ino,
+			   long unsigned nlookup)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  cfuse->client->ll_forget(cfuse->iget(ino), nlookup+1);
+  fuse_reply_none(req);
+}
+
+static void fuse_ll_getattr(fuse_req_t req, fuse_ino_t ino,
+			    struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  struct stat stbuf;
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+  
+  (void) fi; // XXX
+
+  if (cfuse->client->ll_getattr(in, &stbuf, perms)
+      == 0) {
+    stbuf.st_ino = cfuse->make_fake_ino(stbuf.st_ino, stbuf.st_dev);
+    stbuf.st_rdev = new_encode_dev(stbuf.st_rdev);
+    fuse_reply_attr(req, &stbuf, 0);
+  } else
+    fuse_reply_err(req, ENOENT);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
+			    int to_set, struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int mask = 0;
+  if (to_set & FUSE_SET_ATTR_MODE) mask |= CEPH_SETATTR_MODE;
+  if (to_set & FUSE_SET_ATTR_UID) mask |= CEPH_SETATTR_UID;
+  if (to_set & FUSE_SET_ATTR_GID) mask |= CEPH_SETATTR_GID;
+  if (to_set & FUSE_SET_ATTR_MTIME) mask |= CEPH_SETATTR_MTIME;
+  if (to_set & FUSE_SET_ATTR_ATIME) mask |= CEPH_SETATTR_ATIME;
+  if (to_set & FUSE_SET_ATTR_SIZE) mask |= CEPH_SETATTR_SIZE;
+#if !defined(DARWIN)
+  if (to_set & FUSE_SET_ATTR_MTIME_NOW) mask |= CEPH_SETATTR_MTIME_NOW;
+  if (to_set & FUSE_SET_ATTR_ATIME_NOW) mask |= CEPH_SETATTR_ATIME_NOW;
+#endif
+
+  int r = cfuse->client->ll_setattr(in, attr, mask, perms);
+  if (r == 0)
+    fuse_reply_attr(req, attr, 0);
+  else
+    fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+// XATTRS
+
+static void fuse_ll_setxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
+			     const char *value, size_t size, 
+			     int flags
+#if defined(DARWIN)
+			     ,uint32_t pos
+#endif
+  )
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_setxattr(in, name, value, size, flags, perms);
+  fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  char buf[size];
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_listxattr(in, buf, size, perms);
+  if (size == 0 && r >= 0)
+    fuse_reply_xattr(req, r);
+  else if (r >= 0) 
+    fuse_reply_buf(req, buf, r);
+  else
+    fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_getxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
+			     size_t size
+#if defined(DARWIN)
+			     ,uint32_t position
+#endif
+  )
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  char buf[size];
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_getxattr(in, name, buf, size, perms);
+  if (size == 0 && r >= 0)
+    fuse_reply_xattr(req, r);
+  else if (r >= 0)
+    fuse_reply_buf(req, buf, r);
+  else
+    fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_removexattr(fuse_req_t req, fuse_ino_t ino,
+				const char *name)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_removexattr(in, name, perms);
+  fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_opendir(fuse_req_t req, fuse_ino_t ino,
+			    struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  void *dirp;
+
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_opendir(in, fi->flags, (dir_result_t **)&dirp,
+				    perms);
+  if (r >= 0) {
+    fi->fh = (uint64_t)dirp;
+    fuse_reply_open(req, fi);
+  } else {
+    fuse_reply_err(req, -r);
+  }
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_readlink(fuse_req_t req, fuse_ino_t ino)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  char buf[PATH_MAX + 1];  // leave room for a null terminator
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_readlink(in, buf, sizeof(buf) - 1, perms);
+  if (r >= 0) {
+    buf[r] = '\0';
+    fuse_reply_readlink(req, buf);
+  } else {
+    fuse_reply_err(req, -r);
+  }
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_mknod(fuse_req_t req, fuse_ino_t parent, const char *name,
+			  mode_t mode, dev_t rdev)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *i2, *i1 = cfuse->iget(parent);
+  struct fuse_entry_param fe;
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  memset(&fe, 0, sizeof(fe));
+
+  int r = cfuse->client->ll_mknod(i1, name, mode, new_decode_dev(rdev),
+				  &fe.attr, &i2, perms);
+  if (r == 0) {
+    fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
+    fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
+    fuse_reply_entry(req, &fe);
+  } else {
+    fuse_reply_err(req, -r);
+  }
+
+  // XXX NB, we dont iput(i2) because FUSE will do so in a matching
+  // fuse_ll_forget()
+  cfuse->iput(i1); // iput required
+}
+
+static void fuse_ll_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name,
+			  mode_t mode)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *i2, *i1;
+  struct fuse_entry_param fe;
+
+  memset(&fe, 0, sizeof(fe));
+  UserPerm perm(ctx->uid, ctx->gid);
+  GET_GROUPS(perm, req);
+#ifdef HAVE_SYS_SYNCFS
+  if (cfuse->fino_snap(parent) == CEPH_SNAPDIR &&
+      cfuse->client->cct->_conf->fuse_multithreaded &&
+      cfuse->client->cct->_conf->fuse_syncfs_on_mksnap) {
+    int err = 0;
+    int fd = ::open(cfuse->mountpoint, O_RDONLY | O_DIRECTORY);
+    if (fd < 0) {
+      err = errno;
+    } else {
+      int r = ::syncfs(fd);
+      if (r < 0)
+	err = errno;
+      ::close(fd);
+    }
+    if (err) {
+      fuse_reply_err(req, err);
+      return;
+    }
+  }
+#endif
+
+  i1 = cfuse->iget(parent);
+  int r = cfuse->client->ll_mkdir(i1, name, mode, &fe.attr, &i2, perm);
+  if (r == 0) {
+    fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
+    fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
+    fuse_reply_entry(req, &fe);
+  } else {
+    fuse_reply_err(req, -r);
+  }
+
+  // XXX NB, we dont iput(i2) because FUSE will do so in a matching
+  // fuse_ll_forget()
+  cfuse->iput(i1); // iput required
+}
+
+static void fuse_ll_unlink(fuse_req_t req, fuse_ino_t parent, const char *name)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(parent);
+  UserPerm perm(ctx->uid, ctx->gid);
+  GET_GROUPS(perm, req);
+
+  int r = cfuse->client->ll_unlink(in, name, perm);
+  fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(parent);
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_rmdir(in, name, perms);
+  fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_symlink(fuse_req_t req, const char *existing,
+			    fuse_ino_t parent, const char *name)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *i2, *i1 = cfuse->iget(parent);
+  struct fuse_entry_param fe;
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  memset(&fe, 0, sizeof(fe));
+
+  int r = cfuse->client->ll_symlink(i1, name, existing, &fe.attr, &i2, perms);
+  if (r == 0) {
+    fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
+    fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
+    fuse_reply_entry(req, &fe);
+  } else {
+    fuse_reply_err(req, -r);
+  }
+
+  // XXX NB, we dont iput(i2) because FUSE will do so in a matching
+  // fuse_ll_forget()
+  cfuse->iput(i1); // iput required
+}
+
+static void fuse_ll_rename(fuse_req_t req, fuse_ino_t parent, const char *name,
+			   fuse_ino_t newparent, const char *newname)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(parent);
+  Inode *nin = cfuse->iget(newparent);
+  UserPerm perm(ctx->uid, ctx->gid);
+  GET_GROUPS(perm, req);
+
+  int r = cfuse->client->ll_rename(in, name, nin, newname, perm);
+  fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iputs required
+  cfuse->iput(nin);
+}
+
+static void fuse_ll_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent,
+			 const char *newname)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  Inode *nin = cfuse->iget(newparent);
+  struct fuse_entry_param fe;
+
+  memset(&fe, 0, sizeof(fe));
+  UserPerm perm(ctx->uid, ctx->gid);
+  GET_GROUPS(perm, req);
+  
+  /*
+   * Note that we could successfully link, but then fail the subsequent
+   * getattr and return an error. Perhaps we should ignore getattr errors,
+   * but then how do we tell FUSE that the attrs are bogus?
+   */
+  int r = cfuse->client->ll_link(in, nin, newname, perm);
+  if (r == 0) {
+    r = cfuse->client->ll_getattr(in, &fe.attr, perm);
+    if (r == 0) {
+      fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
+      fe.attr.st_rdev = new_encode_dev(fe.attr.st_rdev);
+      fuse_reply_entry(req, &fe);
+    }
+  }
+
+  if (r != 0) {
+    /*
+     * Many ll operations in libcephfs return an extra inode reference, but
+     * ll_link currently does not. Still, FUSE needs one for the new dentry,
+     * so we commandeer the reference taken earlier when ll_link is successful.
+     * On error however, we must put that reference.
+     */
+    cfuse->iput(in);
+    fuse_reply_err(req, -r);
+  }
+
+  cfuse->iput(nin);
+}
+
+static void fuse_ll_open(fuse_req_t req, fuse_ino_t ino,
+			 struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *in = cfuse->iget(ino);
+  Fh *fh = NULL;
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_open(in, fi->flags, &fh, perms);
+  if (r == 0) {
+    fi->fh = (uint64_t)fh;
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
+    if (cfuse->client->cct->_conf->fuse_disable_pagecache)
+      fi->direct_io = 1;
+    else if (cfuse->client->cct->_conf->fuse_use_invalidate_cb)
+      fi->keep_cache = 1;
+#endif
+    fuse_reply_open(req, fi);
+  } else {
+    fuse_reply_err(req, -r);
+  }
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_read(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off,
+			 struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = reinterpret_cast<Fh*>(fi->fh);
+  bufferlist bl;
+  int r = cfuse->client->ll_read(fh, off, size, &bl);
+  if (r >= 0)
+    fuse_reply_buf(req, bl.c_str(), bl.length());
+  else
+    fuse_reply_err(req, -r);
+}
+
+static void fuse_ll_write(fuse_req_t req, fuse_ino_t ino, const char *buf,
+			   size_t size, off_t off, struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = reinterpret_cast<Fh*>(fi->fh);
+  int r = cfuse->client->ll_write(fh, off, size, buf);
+  if (r >= 0)
+    fuse_reply_write(req, r);
+  else
+    fuse_reply_err(req, -r);
+}
+
+static void fuse_ll_flush(fuse_req_t req, fuse_ino_t ino,
+			  struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = reinterpret_cast<Fh*>(fi->fh);
+  int r = cfuse->client->ll_flush(fh);
+  fuse_reply_err(req, -r);
+}
+
+#ifdef FUSE_IOCTL_COMPAT
+static void fuse_ll_ioctl(fuse_req_t req, fuse_ino_t ino, int cmd, void *arg, struct fuse_file_info *fi,
+			  unsigned flags, const void *in_buf, size_t in_bufsz, size_t out_bufsz)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+
+  if (flags & FUSE_IOCTL_COMPAT) {
+    fuse_reply_err(req, ENOSYS);
+    return;
+  }
+
+  switch (static_cast<unsigned>(cmd)) {
+    case CEPH_IOC_GET_LAYOUT: {
+      file_layout_t layout;
+      struct ceph_ioctl_layout l;
+      Fh *fh = (Fh*)fi->fh;
+      cfuse->client->ll_file_layout(fh, &layout);
+      l.stripe_unit = layout.stripe_unit;
+      l.stripe_count = layout.stripe_count;
+      l.object_size = layout.object_size;
+      l.data_pool = layout.pool_id;
+      fuse_reply_ioctl(req, 0, &l, sizeof(struct ceph_ioctl_layout));
+    }
+    break;
+    default:
+      fuse_reply_err(req, EINVAL);
+  }
+}
+#endif
+
+#if FUSE_VERSION > FUSE_MAKE_VERSION(2, 9)
+
+static void fuse_ll_fallocate(fuse_req_t req, fuse_ino_t ino, int mode,
+                              off_t offset, off_t length,
+                              struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = (Fh*)fi->fh;
+  int r = cfuse->client->ll_fallocate(fh, mode, offset, length);
+  fuse_reply_err(req, -r);
+}
+
+#endif
+
+static void fuse_ll_release(fuse_req_t req, fuse_ino_t ino,
+			    struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = reinterpret_cast<Fh*>(fi->fh);
+  int r = cfuse->client->ll_release(fh);
+  fuse_reply_err(req, -r);
+}
+
+static void fuse_ll_fsync(fuse_req_t req, fuse_ino_t ino, int datasync,
+			  struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = reinterpret_cast<Fh*>(fi->fh);
+  int r = cfuse->client->ll_fsync(fh, datasync);
+  fuse_reply_err(req, -r);
+}
+
+struct readdir_context {
+  fuse_req_t req;
+  char *buf;
+  size_t size;
+  size_t pos; /* in buf */
+  uint64_t snap;
+};
+
+/*
+ * return 0 on success, -1 if out of space
+ */
+static int fuse_ll_add_dirent(void *p, struct dirent *de,
+			      struct ceph_statx *stx, off_t next_off,
+			      Inode *in)
+{
+  struct readdir_context *c = (struct readdir_context *)p;
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)fuse_req_userdata(c->req);
+
+  struct stat st;
+  st.st_ino = cfuse->make_fake_ino(stx->stx_ino, c->snap);
+  st.st_mode = stx->stx_mode;
+  st.st_rdev = new_encode_dev(stx->stx_rdev);
+
+  size_t room = c->size - c->pos;
+  size_t entrysize = fuse_add_direntry(c->req, c->buf + c->pos, room,
+				       de->d_name, &st, next_off);
+  if (entrysize > room)
+    return -ENOSPC;
+
+  /* success */
+  c->pos += entrysize;
+  return 0;
+}
+
+static void fuse_ll_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
+			    off_t off, struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+
+  dir_result_t *dirp = reinterpret_cast<dir_result_t*>(fi->fh);
+  cfuse->client->seekdir(dirp, off);
+
+  struct readdir_context rc;
+  rc.req = req;
+  rc.buf = new char[size];
+  rc.size = size;
+  rc.pos = 0;
+  rc.snap = cfuse->fino_snap(ino);
+
+  int r = cfuse->client->readdir_r_cb(dirp, fuse_ll_add_dirent, &rc);
+  if (r == 0 || r == -ENOSPC)  /* ignore ENOSPC from our callback */
+    fuse_reply_buf(req, rc.buf, rc.pos);
+  else
+    fuse_reply_err(req, -r);
+  delete[] rc.buf;
+}
+
+static void fuse_ll_releasedir(fuse_req_t req, fuse_ino_t ino,
+			       struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  dir_result_t *dirp = reinterpret_cast<dir_result_t*>(fi->fh);
+  cfuse->client->ll_releasedir(dirp);
+  fuse_reply_err(req, 0);
+}
+
+static void fuse_ll_fsyncdir(fuse_req_t req, fuse_ino_t ino, int datasync,
+			     struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  dir_result_t *dirp = reinterpret_cast<dir_result_t*>(fi->fh);
+  int r = cfuse->client->ll_fsyncdir(dirp);
+  fuse_reply_err(req, -r);
+}
+
+static void fuse_ll_access(fuse_req_t req, fuse_ino_t ino, int mask)
+{
+  fuse_reply_err(req, 0);
+}
+
+static void fuse_ll_create(fuse_req_t req, fuse_ino_t parent, const char *name,
+			   mode_t mode, struct fuse_file_info *fi)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  Inode *i1 = cfuse->iget(parent), *i2;
+  struct fuse_entry_param fe;
+  Fh *fh = NULL;
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  memset(&fe, 0, sizeof(fe));
+
+  // pass &i2 for the created inode so that ll_create takes an initial ll_ref
+  int r = cfuse->client->ll_create(i1, name, mode, fi->flags, &fe.attr, &i2,
+				   &fh, perms);
+  if (r == 0) {
+    fi->fh = (uint64_t)fh;
+    fe.ino = cfuse->make_fake_ino(fe.attr.st_ino, fe.attr.st_dev);
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
+    if (cfuse->client->cct->_conf->fuse_disable_pagecache)
+      fi->direct_io = 1;
+    else if (cfuse->client->cct->_conf->fuse_use_invalidate_cb)
+      fi->keep_cache = 1;
+#endif
+    fuse_reply_create(req, &fe, fi);
+  } else
+    fuse_reply_err(req, -r);
+  // XXX NB, we dont iput(i2) because FUSE will do so in a matching
+  // fuse_ll_forget()
+  cfuse->iput(i1); // iput required
+}
+
+static void fuse_ll_statfs(fuse_req_t req, fuse_ino_t ino)
+{
+  struct statvfs stbuf;
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Inode *in = cfuse->iget(ino);
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  UserPerm perms(ctx->uid, ctx->gid);
+  GET_GROUPS(perms, req);
+
+  int r = cfuse->client->ll_statfs(in, &stbuf, perms);
+  if (r == 0)
+    fuse_reply_statfs(req, &stbuf);
+  else
+    fuse_reply_err(req, -r);
+
+  cfuse->iput(in); // iput required
+}
+
+static void fuse_ll_getlk(fuse_req_t req, fuse_ino_t ino,
+			  struct fuse_file_info *fi, struct flock *lock)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = reinterpret_cast<Fh*>(fi->fh);
+
+  int r = cfuse->client->ll_getlk(fh, lock, fi->lock_owner);
+  if (r == 0)
+    fuse_reply_lock(req, lock);
+  else
+    fuse_reply_err(req, -r);
+}
+
+static void fuse_ll_setlk(fuse_req_t req, fuse_ino_t ino,
+		          struct fuse_file_info *fi, struct flock *lock, int sleep)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = reinterpret_cast<Fh*>(fi->fh);
+
+  // must use multithread if operation may block
+  if (!cfuse->client->cct->_conf->fuse_multithreaded &&
+      sleep && lock->l_type != F_UNLCK) {
+    fuse_reply_err(req, EDEADLK);
+    return;
+  }
+
+  int r = cfuse->client->ll_setlk(fh, lock, fi->lock_owner, sleep);
+  fuse_reply_err(req, -r);
+}
+
+static void fuse_ll_interrupt(fuse_req_t req, void* data)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  cfuse->client->ll_interrupt(data);
+}
+
+static void switch_interrupt_cb(void *handle, void* data)
+{
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
+  fuse_req_t req = cfuse->get_fuse_req();
+
+  if (data)
+    fuse_req_interrupt_func(req, fuse_ll_interrupt, data);
+  else
+    fuse_req_interrupt_func(req, NULL, NULL);
+}
+
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
+static void fuse_ll_flock(fuse_req_t req, fuse_ino_t ino,
+		          struct fuse_file_info *fi, int cmd)
+{
+  CephFuse::Handle *cfuse = fuse_ll_req_prepare(req);
+  Fh *fh = (Fh*)fi->fh;
+
+  // must use multithread if operation may block
+  if (!cfuse->client->cct->_conf->fuse_multithreaded &&
+      !(cmd & (LOCK_NB | LOCK_UN))) {
+    fuse_reply_err(req, EDEADLK);
+    return;
+  }
+
+  int r = cfuse->client->ll_flock(fh, cmd, fi->lock_owner);
+  fuse_reply_err(req, -r);
+}
+#endif
+
+#if !defined(DARWIN)
+static mode_t umask_cb(void *handle)
+{
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
+  fuse_req_t req = cfuse->get_fuse_req();
+  const struct fuse_ctx *ctx = fuse_req_ctx(req);
+  return ctx->umask;
+}
+#endif
+
+static void ino_invalidate_cb(void *handle, vinodeno_t vino, int64_t off,
+			      int64_t len)
+{
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
+  fuse_ino_t fino = cfuse->make_fake_ino(vino.ino, vino.snapid);
+  fuse_lowlevel_notify_inval_inode(cfuse->ch, fino, off, len);
+#endif
+}
+
+static void dentry_invalidate_cb(void *handle, vinodeno_t dirino,
+				 vinodeno_t ino, string& name)
+{
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
+  fuse_ino_t fdirino = cfuse->make_fake_ino(dirino.ino, dirino.snapid);
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
+  fuse_ino_t fino = 0;
+  if (ino.ino != inodeno_t())
+    fino = cfuse->make_fake_ino(ino.ino, ino.snapid);
+  fuse_lowlevel_notify_delete(cfuse->ch, fdirino, fino, name.c_str(), name.length());
+#elif FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
+  fuse_lowlevel_notify_inval_entry(cfuse->ch, fdirino, name.c_str(), name.length());
+#endif
+}
+
+static int remount_cb(void *handle)
+{
+  // used for trimming kernel dcache. when remounting a file system, linux kernel
+  // trims all unused dentries in the file system
+  char cmd[1024];
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)handle;
+  snprintf(cmd, sizeof(cmd), "mount -i -o remount %s", cfuse->mountpoint);
+  int r = system(cmd);
+  if (r != 0 && r != -1) {
+    r = WEXITSTATUS(r);
+  }
+
+  return r;
+}
+
+static void do_init(void *data, fuse_conn_info *conn)
+{
+  CephFuse::Handle *cfuse = (CephFuse::Handle *)data;
+  Client *client = cfuse->client;
+
+#if !defined(DARWIN)
+  if (!client->cct->_conf->fuse_default_permissions &&
+      client->ll_handle_umask()) {
+    // apply umask in userspace if posix acl is enabled
+    if(conn->capable & FUSE_CAP_DONT_MASK)
+      conn->want |= FUSE_CAP_DONT_MASK;
+  }
+#endif
+
+  if (cfuse->fd_on_success) {
+    //cout << "fuse init signaling on fd " << fd_on_success << std::endl;
+    // see Preforker::daemonize(), ceph-fuse's parent process expects a `-1`
+    // from a daemonized child process.
+    uint32_t r = -1;
+    int err = safe_write(cfuse->fd_on_success, &r, sizeof(r));
+    if (err) {
+      derr << "fuse_ll: do_init: safe_write failed with error "
+	   << cpp_strerror(err) << dendl;
+      ceph_abort();
+    }
+    //cout << "fuse init done signaling on fd " << fd_on_success << std::endl;
+
+    // close stdout, etc.
+    ::close(0);
+    ::close(1);
+    ::close(2);
+  }
+}
+
+const static struct fuse_lowlevel_ops fuse_ll_oper = {
+ init: do_init,
+ destroy: 0,
+ lookup: fuse_ll_lookup,
+ forget: fuse_ll_forget,
+ getattr: fuse_ll_getattr,
+ setattr: fuse_ll_setattr,
+ readlink: fuse_ll_readlink,
+ mknod: fuse_ll_mknod,
+ mkdir: fuse_ll_mkdir,
+ unlink: fuse_ll_unlink,
+ rmdir: fuse_ll_rmdir,
+ symlink: fuse_ll_symlink,
+ rename: fuse_ll_rename,
+ link: fuse_ll_link,
+ open: fuse_ll_open,
+ read: fuse_ll_read,
+ write: fuse_ll_write,
+ flush: fuse_ll_flush,
+ release: fuse_ll_release,
+ fsync: fuse_ll_fsync,
+ opendir: fuse_ll_opendir,
+ readdir: fuse_ll_readdir,
+ releasedir: fuse_ll_releasedir,
+ fsyncdir: fuse_ll_fsyncdir,
+ statfs: fuse_ll_statfs,
+ setxattr: fuse_ll_setxattr,
+ getxattr: fuse_ll_getxattr,
+ listxattr: fuse_ll_listxattr,
+ removexattr: fuse_ll_removexattr,
+ access: fuse_ll_access,
+ create: fuse_ll_create,
+ getlk: fuse_ll_getlk,
+ setlk: fuse_ll_setlk,
+ bmap: 0,
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
+#ifdef FUSE_IOCTL_COMPAT
+ ioctl: fuse_ll_ioctl,
+#else
+ ioctl: 0,
+#endif
+ poll: 0,
+#endif
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
+ write_buf: 0,
+ retrieve_reply: 0,
+ forget_multi: 0,
+ flock: fuse_ll_flock,
+#endif
+#if FUSE_VERSION > FUSE_MAKE_VERSION(2, 9)
+ fallocate: fuse_ll_fallocate
+#endif
+};
+
+
+CephFuse::Handle::Handle(Client *c, int fd) :
+  fd_on_success(fd),
+  client(c),
+  ch(NULL),
+  se(NULL),
+  mountpoint(NULL),
+  stag_lock("fuse_ll.cc stag_lock"),
+  last_stag(0)
+{
+  snap_stag_map[CEPH_NOSNAP] = 0;
+  stag_snap_map[0] = CEPH_NOSNAP;
+  memset(&args, 0, sizeof(args));
+}
+
+CephFuse::Handle::~Handle()
+{
+  fuse_opt_free_args(&args);
+}
+
+void CephFuse::Handle::finalize()
+{
+  if (se)
+    fuse_remove_signal_handlers(se);
+  if (ch)
+    fuse_session_remove_chan(ch);
+  if (se)
+    fuse_session_destroy(se);
+  if (ch)
+    fuse_unmount(mountpoint, ch);
+
+  pthread_key_delete(fuse_req_key);
+}
+
+int CephFuse::Handle::init(int argc, const char *argv[])
+{
+
+  int r = pthread_key_create(&fuse_req_key, NULL);
+  if (r) {
+    derr << "pthread_key_create failed." << dendl;
+    return r;
+  }
+
+  // set up fuse argc/argv
+  int newargc = 0;
+  const char **newargv = (const char **) malloc((argc + 10) * sizeof(char *));
+  if(!newargv)
+    return ENOMEM;
+
+  newargv[newargc++] = argv[0];
+  newargv[newargc++] = "-f";  // stay in foreground
+
+  if (client->cct->_conf->fuse_allow_other) {
+    newargv[newargc++] = "-o";
+    newargv[newargc++] = "allow_other";
+  }
+  if (client->cct->_conf->fuse_default_permissions) {
+    newargv[newargc++] = "-o";
+    newargv[newargc++] = "default_permissions";
+  }
+#if defined(__linux__)
+  if (client->cct->_conf->fuse_big_writes) {
+    newargv[newargc++] = "-o";
+    newargv[newargc++] = "big_writes";
+  }
+  if (client->cct->_conf->fuse_atomic_o_trunc) {
+    newargv[newargc++] = "-o";
+    newargv[newargc++] = "atomic_o_trunc";
+  }
+#endif
+  if (client->cct->_conf->fuse_debug)
+    newargv[newargc++] = "-d";
+
+  for (int argctr = 1; argctr < argc; argctr++)
+    newargv[newargc++] = argv[argctr];
+
+  derr << "init, newargv = " << newargv << " newargc=" << newargc << dendl;
+  struct fuse_args a = FUSE_ARGS_INIT(newargc, (char**)newargv);
+  args = a;  // Roundabout construction b/c FUSE_ARGS_INIT is for initialization not assignment
+
+  if (fuse_parse_cmdline(&args, &mountpoint, NULL, NULL) == -1) {
+    derr << "fuse_parse_cmdline failed." << dendl;
+    fuse_opt_free_args(&args);
+    free(newargv);
+    return EINVAL;
+  }
+
+  assert(args.allocated);  // Checking fuse has realloc'd args so we can free newargv
+  free(newargv);
+  return 0;
+}
+
+int CephFuse::Handle::start()
+{
+  ch = fuse_mount(mountpoint, &args);
+  if (!ch) {
+    derr << "fuse_mount(mountpoint=" << mountpoint << ") failed." << dendl;
+    return EIO;
+  }
+
+  se = fuse_lowlevel_new(&args, &fuse_ll_oper, sizeof(fuse_ll_oper), this);
+  if (!se) {
+    derr << "fuse_lowlevel_new failed" << dendl;
+    return EDOM;
+  }
+
+  signal(SIGTERM, SIG_DFL);
+  signal(SIGINT, SIG_DFL);
+  if (fuse_set_signal_handlers(se) == -1) {
+    derr << "fuse_set_signal_handlers failed" << dendl;
+    return ENOSYS;
+  }
+
+  fuse_session_add_chan(se, ch);
+
+
+  struct client_callback_args args = {
+    handle: this,
+    ino_cb: client->cct->_conf->fuse_use_invalidate_cb ? ino_invalidate_cb : NULL,
+    dentry_cb: dentry_invalidate_cb,
+    switch_intr_cb: switch_interrupt_cb,
+#if defined(__linux__)
+    remount_cb: remount_cb,
+#endif
+    getgroups_cb: getgroups_cb,
+#if !defined(DARWIN)
+    umask_cb: umask_cb,
+#endif
+  };
+  client->ll_register_callbacks(&args);
+
+  return 0;
+}
+
+int CephFuse::Handle::loop()
+{
+  if (client->cct->_conf->fuse_multithreaded) {
+    return fuse_session_loop_mt(se);
+  } else {
+    return fuse_session_loop(se);
+  }
+}
+
+uint64_t CephFuse::Handle::fino_snap(uint64_t fino)
+{
+  if (fino == FUSE_ROOT_ID)
+    return CEPH_NOSNAP;
+
+  if (client->use_faked_inos()) {
+    vinodeno_t vino  = client->map_faked_ino(fino);
+    return vino.snapid;
+  } else {
+    Mutex::Locker l(stag_lock);
+    uint64_t stag = FINO_STAG(fino);
+    assert(stag_snap_map.count(stag));
+    return stag_snap_map[stag];
+  }
+}
+
+Inode * CephFuse::Handle::iget(fuse_ino_t fino)
+{
+  if (fino == FUSE_ROOT_ID)
+    return client->get_root();
+
+  if (client->use_faked_inos()) {
+    return client->ll_get_inode((ino_t)fino);
+  } else {
+    vinodeno_t vino(FINO_INO(fino), fino_snap(fino));
+    return client->ll_get_inode(vino);
+  }
+}
+
+void CephFuse::Handle::iput(Inode *in)
+{
+    client->ll_put(in);
+}
+
+uint64_t CephFuse::Handle::make_fake_ino(inodeno_t ino, snapid_t snapid)
+{
+  if (client->use_faked_inos()) {
+    // already faked by libcephfs
+    if (ino == client->get_root_ino())
+      return FUSE_ROOT_ID;
+
+    return ino;
+  } else {
+    if (snapid == CEPH_NOSNAP && ino == client->get_root_ino())
+      return FUSE_ROOT_ID;
+
+    Mutex::Locker l(stag_lock);
+    uint64_t stag;
+    if (snap_stag_map.count(snapid) == 0) {
+      stag = ++last_stag;
+      snap_stag_map[snapid] = stag;
+      stag_snap_map[stag] = snapid;
+    } else
+      stag = snap_stag_map[snapid];
+    inodeno_t fino = MAKE_FINO(ino, stag);
+    //cout << "make_fake_ino " << ino << "." << snapid << " -> " << fino << std::endl;
+    return fino;
+  }
+}
+
+void CephFuse::Handle::set_fuse_req(fuse_req_t req)
+{
+  pthread_setspecific(fuse_req_key, (void*)req);
+}
+
+fuse_req_t CephFuse::Handle::get_fuse_req()
+{
+  return (fuse_req_t) pthread_getspecific(fuse_req_key);
+}
+
+
+CephFuse::CephFuse(Client *c, int fd) : _handle(new CephFuse::Handle(c, fd))
+{
+}
+
+CephFuse::~CephFuse()
+{
+  delete _handle;
+}
+
+int CephFuse::init(int argc, const char *argv[])
+{
+  return _handle->init(argc, argv);
+}
+
+int CephFuse::start()
+{
+  return _handle->start();
+}
+
+int CephFuse::loop()
+{
+  return _handle->loop();
+}
+
+void CephFuse::finalize()
+{
+  return _handle->finalize();
+}
+
+std::string CephFuse::get_mount_point() const
+{
+  if (_handle->mountpoint) {
+    return _handle->mountpoint;
+  } else {
+    return "";
+  }
+}