+++ /dev/null
-// -*- 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);
-}
Code Review / stor4nfv.git / blobdiff