--- /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