--- /dev/null
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
+ *
+ * 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 <errno.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include "include/uuid.h"
+
+#ifdef __linux__
+#include <linux/fs.h>
+#include <blkid/blkid.h>
+
+#define UUID_LEN 36
+
+static const char *sandbox_dir = "";
+
+void set_block_device_sandbox_dir(const char *dir)
+{
+ if (dir)
+ sandbox_dir = dir;
+ else
+ sandbox_dir = "";
+}
+
+int get_block_device_size(int fd, int64_t *psize)
+{
+#ifdef BLKGETSIZE64
+ int ret = ::ioctl(fd, BLKGETSIZE64, psize);
+#elif defined(BLKGETSIZE)
+ unsigned long sectors = 0;
+ int ret = ::ioctl(fd, BLKGETSIZE, §ors);
+ *psize = sectors * 512ULL;
+#else
+// cppcheck-suppress preprocessorErrorDirective
+# error "Linux configuration error (get_block_device_size)"
+#endif
+ if (ret < 0)
+ ret = -errno;
+ return ret;
+}
+
+/**
+ * get the base device (strip off partition suffix and /dev/ prefix)
+ * e.g.,
+ * /dev/sda3 -> sda
+ * /dev/cciss/c0d1p2 -> cciss/c0d1
+ * dev can a symbolic link.
+ */
+int get_block_device_base(const char *dev, char *out, size_t out_len)
+{
+ struct stat st;
+ int r = 0;
+ DIR *dir;
+ char devname[PATH_MAX] = {0}, fn[PATH_MAX] = {0};
+ char *p;
+ char realname[PATH_MAX] = {0};
+
+ if (strncmp(dev, "/dev/", 5) != 0) {
+ if (realpath(dev, realname) == NULL || (strncmp(realname, "/dev/", 5) != 0)) {
+ return -EINVAL;
+ }
+ }
+
+ if (strlen(realname))
+ strncpy(devname, realname + 5, PATH_MAX - 5);
+ else
+ strncpy(devname, dev + 5, strlen(dev) - 5);
+
+ devname[PATH_MAX - 1] = '\0';
+
+ for (p = devname; *p; ++p)
+ if (*p == '/')
+ *p = '!';
+
+ snprintf(fn, sizeof(fn), "%s/sys/block/%s", sandbox_dir, devname);
+ if (stat(fn, &st) == 0) {
+ if (strlen(devname) + 1 > out_len) {
+ return -ERANGE;
+ }
+ strncpy(out, devname, out_len);
+ return 0;
+ }
+
+ snprintf(fn, sizeof(fn), "%s/sys/block", sandbox_dir);
+ dir = opendir(fn);
+ if (!dir)
+ return -errno;
+
+ struct dirent *de = nullptr;
+ while ((de = ::readdir(dir))) {
+ if (de->d_name[0] == '.')
+ continue;
+ snprintf(fn, sizeof(fn), "%s/sys/block/%s/%s", sandbox_dir, de->d_name,
+ devname);
+
+ if (stat(fn, &st) == 0) {
+ // match!
+ if (strlen(de->d_name) + 1 > out_len) {
+ r = -ERANGE;
+ goto out;
+ }
+ strncpy(out, de->d_name, out_len);
+ r = 0;
+ goto out;
+ }
+ }
+ r = -ENOENT;
+
+ out:
+ closedir(dir);
+ return r;
+}
+
+/**
+ * get a block device property as a string
+ *
+ * store property in *val, up to maxlen chars
+ * return 0 on success
+ * return negative error on error
+ */
+int64_t get_block_device_string_property(const char *devname,
+ const char *property,
+ char *val, size_t maxlen)
+{
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename),
+ "%s/sys/block/%s/%s", sandbox_dir, devname, property);
+
+ FILE *fp = fopen(filename, "r");
+ if (fp == NULL) {
+ return -errno;
+ }
+
+ int r = 0;
+ if (fgets(val, maxlen - 1, fp)) {
+ // truncate at newline
+ char *p = val;
+ while (*p && *p != '\n')
+ ++p;
+ *p = 0;
+ } else {
+ r = -EINVAL;
+ }
+ fclose(fp);
+ return r;
+}
+
+/**
+ * get a block device property
+ *
+ * return the value (we assume it is positive)
+ * return negative error on error
+ */
+int64_t get_block_device_int_property(const char *devname, const char *property)
+{
+ char buff[256] = {0};
+ int r = get_block_device_string_property(devname, property, buff, sizeof(buff));
+ if (r < 0)
+ return r;
+ // take only digits
+ for (char *p = buff; *p; ++p) {
+ if (!isdigit(*p)) {
+ *p = 0;
+ break;
+ }
+ }
+ char *endptr = 0;
+ r = strtoll(buff, &endptr, 10);
+ if (endptr != buff + strlen(buff))
+ r = -EINVAL;
+ return r;
+}
+
+bool block_device_support_discard(const char *devname)
+{
+ return get_block_device_int_property(devname, "queue/discard_granularity") > 0;
+}
+
+int block_device_discard(int fd, int64_t offset, int64_t len)
+{
+ uint64_t range[2] = {(uint64_t)offset, (uint64_t)len};
+ return ioctl(fd, BLKDISCARD, range);
+}
+
+bool block_device_is_rotational(const char *devname)
+{
+ return get_block_device_int_property(devname, "queue/rotational") > 0;
+}
+
+int block_device_model(const char *devname, char *model, size_t max)
+{
+ return get_block_device_string_property(devname, "device/model", model, max);
+}
+
+int get_device_by_uuid(uuid_d dev_uuid, const char* label, char* partition,
+ char* device)
+{
+ char uuid_str[UUID_LEN+1];
+ char basename[PATH_MAX];
+ const char* temp_partition_ptr = NULL;
+ blkid_cache cache = NULL;
+ blkid_dev dev = NULL;
+ int rc = 0;
+
+ dev_uuid.print(uuid_str);
+
+ if (blkid_get_cache(&cache, NULL) >= 0)
+ dev = blkid_find_dev_with_tag(cache, label, (const char*)uuid_str);
+ else
+ return -EINVAL;
+
+ if (dev) {
+ temp_partition_ptr = blkid_dev_devname(dev);
+ strncpy(partition, temp_partition_ptr, PATH_MAX);
+ rc = get_block_device_base(partition, basename,
+ sizeof(basename));
+ if (rc >= 0) {
+ strncpy(device, basename, sizeof(basename));
+ rc = 0;
+ } else {
+ rc = -ENODEV;
+ }
+ } else {
+ rc = -EINVAL;
+ }
+
+ /* From what I can tell, blkid_put_cache cleans up dev, which
+ * appears to be a pointer into cache, as well */
+ if (cache)
+ blkid_put_cache(cache);
+ return rc;
+}
+
+int get_device_by_fd(int fd, char *partition, char *device, size_t max)
+{
+ struct stat st;
+ int r = fstat(fd, &st);
+ if (r < 0) {
+ return -EINVAL; // hrm.
+ }
+ dev_t devid = S_ISBLK(st.st_mode) ? st.st_rdev : st.st_dev;
+ char *t = blkid_devno_to_devname(devid);
+ if (!t) {
+ return -EINVAL;
+ }
+ strncpy(partition, t, max);
+ free(t);
+ dev_t diskdev;
+ r = blkid_devno_to_wholedisk(devid, device, max, &diskdev);
+ if (r < 0) {
+ return -EINVAL;
+ }
+ return 0;
+}
+
+#elif defined(__APPLE__)
+#include <sys/disk.h>
+
+int get_block_device_size(int fd, int64_t *psize)
+{
+ unsigned long blocksize = 0;
+ int ret = ::ioctl(fd, DKIOCGETBLOCKSIZE, &blocksize);
+ if (!ret) {
+ unsigned long nblocks;
+ ret = ::ioctl(fd, DKIOCGETBLOCKCOUNT, &nblocks);
+ if (!ret)
+ *psize = (int64_t)nblocks * blocksize;
+ }
+ if (ret < 0)
+ ret = -errno;
+ return ret;
+}
+
+bool block_device_support_discard(const char *devname)
+{
+ return false;
+}
+
+int block_device_discard(int fd, int64_t offset, int64_t len)
+{
+ return -EOPNOTSUPP;
+}
+
+bool block_device_is_rotational(const char *devname)
+{
+ return false;
+}
+
+int get_device_by_uuid(uuid_d dev_uuid, const char* label, char* partition,
+ char* device)
+{
+ return -EOPNOTSUPP;
+}
+#elif defined(__FreeBSD__)
+#include <sys/disk.h>
+
+int get_block_device_size(int fd, int64_t *psize)
+{
+ int ret = ::ioctl(fd, DIOCGMEDIASIZE, psize);
+ if (ret < 0)
+ ret = -errno;
+ return ret;
+}
+
+bool block_device_support_discard(const char *devname)
+{
+ return false;
+}
+
+int block_device_discard(int fd, int64_t offset, int64_t len)
+{
+ return -EOPNOTSUPP;
+}
+
+bool block_device_is_rotational(const char *devname)
+{
+ return false;
+}
+
+int get_device_by_uuid(uuid_d dev_uuid, const char* label, char* partition,
+ char* device)
+{
+ return -EOPNOTSUPP;
+}
+int get_device_by_fd(int fd, char *partition, char *device, size_t max)
+{
+ return -EOPNOTSUPP;
+}
+#else
+int get_block_device_size(int fd, int64_t *psize)
+{
+ return -EOPNOTSUPP;
+}
+
+bool block_device_support_discard(const char *devname)
+{
+ return false;
+}
+
+int block_device_discard(int fd, int64_t offset, int64_t len)
+{
+ return -EOPNOTSUPP;
+}
+
+bool block_device_is_rotational(const char *devname)
+{
+ return false;
+}
+
+int get_device_by_uuid(uuid_d dev_uuid, const char* label, char* partition,
+ char* device)
+{
+ return -EOPNOTSUPP;
+}
+
+int get_device_by_fd(int fd, char *partition, char *device, size_t max)
+{
+ return -EOPNOTSUPP;
+}
+#endif
Code Review / stor4nfv.git / blobdiff