X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fos%2Ffilestore%2FGenericFileStoreBackend.cc;fp=src%2Fceph%2Fsrc%2Fos%2Ffilestore%2FGenericFileStoreBackend.cc;h=3ed4e4b5d941bc7ef4aa939bc6c2a1505a886d27;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/os/filestore/GenericFileStoreBackend.cc b/src/ceph/src/os/filestore/GenericFileStoreBackend.cc
new file mode 100644
index 0000000..3ed4e4b
--- /dev/null
+++ b/src/ceph/src/os/filestore/GenericFileStoreBackend.cc
@@ -0,0 +1,481 @@
+// -*- 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 "include/int_types.h"
+#include "include/types.h"
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+
+#if defined(__linux__)
+#include <linux/fs.h>
+#endif
+
+#include "include/compat.h"
+#include "include/linux_fiemap.h"
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+
+#include "GenericFileStoreBackend.h"
+
+#include "common/errno.h"
+#include "common/config.h"
+#include "common/sync_filesystem.h"
+#include "common/blkdev.h"
+
+#include "common/SloppyCRCMap.h"
+#include "os/filestore/chain_xattr.h"
+
+#define SLOPPY_CRC_XATTR "user.cephos.scrc"
+
+
+#define dout_context cct()
+#define dout_subsys ceph_subsys_filestore
+#undef dout_prefix
+#define dout_prefix *_dout << "genericfilestorebackend(" << get_basedir_path() << ") "
+
+#define ALIGN_DOWN(x, by) ((x) - ((x) % (by)))
+#define ALIGNED(x, by) (!((x) % (by)))
+#define ALIGN_UP(x, by) (ALIGNED((x), (by)) ? (x) : (ALIGN_DOWN((x), (by)) + (by)))
+
+GenericFileStoreBackend::GenericFileStoreBackend(FileStore *fs):
+  FileStoreBackend(fs),
+  ioctl_fiemap(false),
+  seek_data_hole(false),
+  use_splice(false),
+  m_filestore_fiemap(cct()->_conf->filestore_fiemap),
+  m_filestore_seek_data_hole(cct()->_conf->filestore_seek_data_hole),
+  m_filestore_fsync_flushes_journal_data(cct()->_conf->filestore_fsync_flushes_journal_data),
+  m_filestore_splice(cct()->_conf->filestore_splice)
+{
+  // rotational?
+  {
+    // NOTE: the below won't work on btrfs; we'll assume rotational.
+    string fn = get_basedir_path();
+    int fd = ::open(fn.c_str(), O_RDONLY);
+    if (fd < 0) {
+      return;
+    }
+    char partition[PATH_MAX], devname[PATH_MAX];
+    int r = get_device_by_fd(fd, partition, devname, sizeof(devname));
+    if (r < 0) {
+      dout(1) << "unable to get device name for " << get_basedir_path() << ": "
+	      << cpp_strerror(r) << dendl;
+      m_rotational = true;
+    } else {
+      m_rotational = block_device_is_rotational(devname);
+      dout(20) << __func__ << " devname " << devname
+	       << " rotational " << (int)m_rotational << dendl;
+    }
+    ::close(fd);
+  }
+  // journal rotational?
+  {
+    // NOTE: the below won't work on btrfs; we'll assume rotational.
+    string fn = get_journal_path();
+    int fd = ::open(fn.c_str(), O_RDONLY);
+    if (fd < 0) {
+      return;
+    }
+    char partition[PATH_MAX], devname[PATH_MAX];
+    int r = get_device_by_fd(fd, partition, devname, sizeof(devname));
+    if (r < 0) {
+      dout(1) << "unable to get journal device name for "
+              << get_journal_path() << ": " << cpp_strerror(r) << dendl;
+      m_journal_rotational = true;
+    } else {
+      m_journal_rotational = block_device_is_rotational(devname);
+      dout(20) << __func__ << " journal devname " << devname
+               << " journal rotational " << (int)m_journal_rotational << dendl;
+    }
+    ::close(fd);
+  }
+}
+
+int GenericFileStoreBackend::detect_features()
+{
+  char fn[PATH_MAX];
+  snprintf(fn, sizeof(fn), "%s/fiemap_test", get_basedir_path().c_str());
+
+  int fd = ::open(fn, O_CREAT|O_RDWR|O_TRUNC, 0644);
+  if (fd < 0) {
+    fd = -errno;
+    derr << "detect_features: unable to create " << fn << ": " << cpp_strerror(fd) << dendl;
+    return fd;
+  }
+
+  // ext4 has a bug in older kernels where fiemap will return an empty
+  // result in some cases.  this is a file layout that triggers the bug
+  // on 2.6.34-rc5.
+  int v[] = {
+    0x0000000000016000, 0x0000000000007000,
+    0x000000000004a000, 0x0000000000007000,
+    0x0000000000060000, 0x0000000000001000,
+    0x0000000000061000, 0x0000000000008000,
+    0x0000000000069000, 0x0000000000007000,
+    0x00000000000a3000, 0x000000000000c000,
+    0x000000000024e000, 0x000000000000c000,
+    0x000000000028b000, 0x0000000000009000,
+    0x00000000002b1000, 0x0000000000003000,
+    0, 0
+  };
+  for (int i=0; v[i]; i++) {
+    int off = v[i++];
+    int len = v[i];
+
+    // write a large extent
+    char buf[len];
+    memset(buf, 1, sizeof(buf));
+    int r = ::lseek(fd, off, SEEK_SET);
+    if (r < 0) {
+      r = -errno;
+      derr << "detect_features: failed to lseek " << fn << ": " << cpp_strerror(r) << dendl;
+      VOID_TEMP_FAILURE_RETRY(::close(fd));
+      return r;
+    }
+    r = write(fd, buf, sizeof(buf));
+    if (r < 0) {
+      derr << "detect_features: failed to write to " << fn << ": " << cpp_strerror(r) << dendl;
+      VOID_TEMP_FAILURE_RETRY(::close(fd));
+      return r;
+    }
+  }
+
+  // fiemap an extent inside that
+  if (!m_filestore_fiemap) {
+    dout(0) << "detect_features: FIEMAP ioctl is disabled via 'filestore fiemap' config option" << dendl;
+    ioctl_fiemap = false;
+  } else {
+    struct fiemap *fiemap;
+    int r = do_fiemap(fd, 2430421, 59284, &fiemap);
+    if (r < 0) {
+      dout(0) << "detect_features: FIEMAP ioctl is NOT supported" << dendl;
+      ioctl_fiemap = false;
+    } else {
+      if (fiemap->fm_mapped_extents == 0) {
+        dout(0) << "detect_features: FIEMAP ioctl is supported, but buggy -- upgrade your kernel" << dendl;
+        ioctl_fiemap = false;
+      } else {
+        dout(0) << "detect_features: FIEMAP ioctl is supported and appears to work" << dendl;
+        ioctl_fiemap = true;
+      }
+      free(fiemap);
+    }
+  }
+
+  // SEEK_DATA/SEEK_HOLE detection
+  if (!m_filestore_seek_data_hole) {
+    dout(0) << "detect_features: SEEK_DATA/SEEK_HOLE is disabled via 'filestore seek data hole' config option" << dendl;
+    seek_data_hole = false;
+  } else {
+#if defined(__linux__) && defined(SEEK_HOLE) && defined(SEEK_DATA)
+    // If compiled on an OS with SEEK_HOLE/SEEK_DATA support, but running
+    // on an OS that doesn't support SEEK_HOLE/SEEK_DATA, EINVAL is returned.
+    // Fall back to use fiemap.
+    off_t hole_pos;
+
+    hole_pos = lseek(fd, 0, SEEK_HOLE);
+    if (hole_pos < 0) {
+      if (errno == EINVAL) {
+        dout(0) << "detect_features: lseek SEEK_DATA/SEEK_HOLE is NOT supported" << dendl;
+        seek_data_hole = false;
+      } else {
+        derr << "detect_features: failed to lseek " << fn << ": " << cpp_strerror(-errno) << dendl;
+        VOID_TEMP_FAILURE_RETRY(::close(fd));
+        return -errno;
+      }
+    } else {
+      dout(0) << "detect_features: lseek SEEK_DATA/SEEK_HOLE is supported" << dendl;
+      seek_data_hole = true;
+    }
+#endif
+  }
+
+  //splice detection
+#ifdef CEPH_HAVE_SPLICE
+  if (!m_filestore_splice) {
+    dout(0) << __func__ << ": splice() is disabled via 'filestore splice' config option" << dendl;
+    use_splice = false;
+  } else {
+    int pipefd[2];
+    loff_t off_in = 0;
+    int r;
+    if ((r = pipe(pipefd)) < 0)
+      dout(0) << "detect_features: splice  pipe met error " << cpp_strerror(errno) << dendl;
+    else {
+      lseek(fd, 0, SEEK_SET);
+      r = splice(fd, &off_in, pipefd[1], NULL, 10, 0);
+      if (!(r < 0 && errno == EINVAL)) {
+	use_splice = true;
+	dout(0) << "detect_features: splice is supported" << dendl;
+      } else
+	dout(0) << "detect_features: splice is NOT supported" << dendl;
+      close(pipefd[0]);
+      close(pipefd[1]);
+    }
+  }
+#endif
+  ::unlink(fn);
+  VOID_TEMP_FAILURE_RETRY(::close(fd));
+
+
+  bool have_syncfs = false;
+#ifdef HAVE_SYS_SYNCFS
+  if (::syncfs(get_basedir_fd()) == 0) {
+    dout(0) << "detect_features: syncfs(2) syscall fully supported (by glibc and kernel)" << dendl;
+    have_syncfs = true;
+  } else {
+    dout(0) << "detect_features: syncfs(2) syscall supported by glibc BUT NOT the kernel" << dendl;
+  }
+#elif defined(SYS_syncfs)
+  if (syscall(SYS_syncfs, get_basedir_fd()) == 0) {
+    dout(0) << "detect_features: syscall(SYS_syncfs, fd) fully supported" << dendl;
+    have_syncfs = true;
+  } else {
+    dout(0) << "detect_features: syscall(SYS_syncfs, fd) supported by libc BUT NOT the kernel" << dendl;
+  }
+#elif defined(__NR_syncfs)
+  if (syscall(__NR_syncfs, get_basedir_fd()) == 0) {
+    dout(0) << "detect_features: syscall(__NR_syncfs, fd) fully supported" << dendl;
+    have_syncfs = true;
+  } else {
+    dout(0) << "detect_features: syscall(__NR_syncfs, fd) supported by libc BUT NOT the kernel" << dendl;
+  }
+#endif
+  if (!have_syncfs) {
+    dout(0) << "detect_features: syncfs(2) syscall not supported" << dendl;
+    if (m_filestore_fsync_flushes_journal_data) {
+      dout(0) << "detect_features: no syncfs(2), but 'filestore fsync flushes journal data = true', so fsync will suffice." << dendl;
+    } else {
+      dout(0) << "detect_features: no syncfs(2), must use sync(2)." << dendl;
+      dout(0) << "detect_features: WARNING: multiple ceph-osd daemons on the same host will be slow" << dendl;
+    }
+  }
+
+  return 0;
+}
+
+int GenericFileStoreBackend::create_current()
+{
+  struct stat st;
+  int ret = ::stat(get_current_path().c_str(), &st);
+  if (ret == 0) {
+    // current/ exists
+    if (!S_ISDIR(st.st_mode)) {
+      dout(0) << "_create_current: current/ exists but is not a directory" << dendl;
+      ret = -EINVAL;
+    }
+  } else {
+    ret = ::mkdir(get_current_path().c_str(), 0755);
+    if (ret < 0) {
+      ret = -errno;
+      dout(0) << "_create_current: mkdir " << get_current_path() << " failed: "<< cpp_strerror(ret) << dendl;
+    }
+  }
+  return ret;
+}
+
+int GenericFileStoreBackend::syncfs()
+{
+  int ret;
+  if (m_filestore_fsync_flushes_journal_data) {
+    dout(15) << "syncfs: doing fsync on " << get_op_fd() << dendl;
+    // make the file system's journal commit.
+    //  this works with ext3, but NOT ext4
+    ret = ::fsync(get_op_fd());
+    if (ret < 0)
+      ret = -errno;
+  } else {
+    dout(15) << "syncfs: doing a full sync (syncfs(2) if possible)" << dendl;
+    ret = sync_filesystem(get_current_fd());
+  }
+  return ret;
+}
+
+int GenericFileStoreBackend::do_fiemap(int fd, off_t start, size_t len, struct fiemap **pfiemap)
+{
+  struct fiemap *fiemap = NULL;
+  struct fiemap *_realloc_fiemap = NULL;
+  int size;
+  int ret;
+
+  fiemap = (struct fiemap*)calloc(sizeof(struct fiemap), 1);
+  if (!fiemap)
+    return -ENOMEM;
+  /*
+   * There is a bug on xfs about fiemap. Suppose(offset=3990, len=4096),
+   * the result is (logical=4096, len=4096). It leak the [3990, 4096).
+   * Commit:"xfs: fix rounding error of fiemap length parameter
+   * (eedf32bfcace7d8e20cc66757d74fc68f3439ff7)" fix this bug.
+   * Here, we make offset aligned with CEPH_PAGE_SIZE to avoid this bug.
+   */
+  fiemap->fm_start = start - start % CEPH_PAGE_SIZE;
+  fiemap->fm_length = len + start % CEPH_PAGE_SIZE;
+  fiemap->fm_flags = FIEMAP_FLAG_SYNC; /* flush extents to disk if needed */
+
+#if defined(DARWIN) || defined(__FreeBSD__)
+  ret = -ENOTSUP;
+  goto done_err;
+#else
+  if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0) {
+    ret = -errno;
+    goto done_err;
+  }
+#endif
+  size = sizeof(struct fiemap_extent) * (fiemap->fm_mapped_extents);
+
+  _realloc_fiemap = (struct fiemap *)realloc(fiemap, sizeof(struct fiemap) + size);
+  if (!_realloc_fiemap) {
+    ret = -ENOMEM;
+    goto done_err;
+  } else {
+    fiemap = _realloc_fiemap;
+  }
+
+  memset(fiemap->fm_extents, 0, size);
+
+  fiemap->fm_extent_count = fiemap->fm_mapped_extents;
+  fiemap->fm_mapped_extents = 0;
+
+#if defined(DARWIN) || defined(__FreeBSD__)
+  ret = -ENOTSUP;
+  goto done_err;
+#else
+  if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0) {
+    ret = -errno;
+    goto done_err;
+  }
+  *pfiemap = fiemap;
+#endif
+  return 0;
+
+done_err:
+  *pfiemap = NULL;
+  free(fiemap);
+  return ret;
+}
+
+
+int GenericFileStoreBackend::_crc_load_or_init(int fd, SloppyCRCMap *cm)
+{
+  char buf[100];
+  bufferptr bp;
+  int r = 0;
+  int l = chain_fgetxattr(fd, SLOPPY_CRC_XATTR, buf, sizeof(buf));
+  if (l == -ENODATA) {
+    return 0;
+  }
+  if (l >= 0) {
+    bp = buffer::create(l);
+    memcpy(bp.c_str(), buf, l);
+  } else if (l == -ERANGE) {
+    l = chain_fgetxattr(fd, SLOPPY_CRC_XATTR, 0, 0);
+    if (l > 0) {
+      bp = buffer::create(l);
+      l = chain_fgetxattr(fd, SLOPPY_CRC_XATTR, bp.c_str(), l);
+    }
+  }
+  bufferlist bl;
+  bl.append(std::move(bp));
+  bufferlist::iterator p = bl.begin();
+  try {
+    ::decode(*cm, p);
+  }
+  catch (buffer::error &e) {
+    r = -EIO;
+  }
+  if (r < 0)
+    derr << __func__ << " got " << cpp_strerror(r) << dendl;
+  return r;
+}
+
+int GenericFileStoreBackend::_crc_save(int fd, SloppyCRCMap *cm)
+{
+  bufferlist bl;
+  ::encode(*cm, bl);
+  int r = chain_fsetxattr(fd, SLOPPY_CRC_XATTR, bl.c_str(), bl.length());
+  if (r < 0)
+    derr << __func__ << " got " << cpp_strerror(r) << dendl;
+  return r;
+}
+
+int GenericFileStoreBackend::_crc_update_write(int fd, loff_t off, size_t len, const bufferlist& bl)
+{
+  SloppyCRCMap scm(get_crc_block_size());
+  int r = _crc_load_or_init(fd, &scm);
+  if (r < 0)
+    return r;
+  ostringstream ss;
+  scm.write(off, len, bl, &ss);
+  dout(30) << __func__ << "\n" << ss.str() << dendl;
+  r = _crc_save(fd, &scm);
+  return r;
+}
+
+int GenericFileStoreBackend::_crc_update_truncate(int fd, loff_t off)
+{
+  SloppyCRCMap scm(get_crc_block_size());
+  int r = _crc_load_or_init(fd, &scm);
+  if (r < 0)
+    return r;
+  scm.truncate(off);
+  r = _crc_save(fd, &scm);
+  return r;
+}
+
+int GenericFileStoreBackend::_crc_update_zero(int fd, loff_t off, size_t len)
+{
+  SloppyCRCMap scm(get_crc_block_size());
+  int r = _crc_load_or_init(fd, &scm);
+  if (r < 0)
+    return r;
+  scm.zero(off, len);
+  r = _crc_save(fd, &scm);
+  return r;
+}
+
+int GenericFileStoreBackend::_crc_update_clone_range(int srcfd, int destfd,
+						     loff_t srcoff, size_t len, loff_t dstoff)
+{
+  SloppyCRCMap scm_src(get_crc_block_size());
+  SloppyCRCMap scm_dst(get_crc_block_size());
+  int r = _crc_load_or_init(srcfd, &scm_src);
+  if (r < 0)
+    return r;
+  r = _crc_load_or_init(destfd, &scm_dst);
+  if (r < 0)
+    return r;
+  ostringstream ss;
+  scm_dst.clone_range(srcoff, len, dstoff, scm_src, &ss);
+  dout(30) << __func__ << "\n" << ss.str() << dendl;
+  r = _crc_save(destfd, &scm_dst);
+  return r;
+}
+
+int GenericFileStoreBackend::_crc_verify_read(int fd, loff_t off, size_t len, const bufferlist& bl,
+					      ostream *out)
+{
+  SloppyCRCMap scm(get_crc_block_size());
+  int r = _crc_load_or_init(fd, &scm);
+  if (r < 0)
+    return r;
+  return scm.read(off, len, bl, out);
+}