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6620dc9475
Save the list of PVs in /run/lvm/hints. These hints are used to reduce scanning in a number of commands to only the PVs on the system, or only the PVs in a requested VG (rather than all devices on the system.)
306 lines
6.8 KiB
C
306 lines
6.8 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "base/memory/zalloc.h"
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#include "lib/misc/lib.h"
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#include "lib/filters/filter.h"
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#include "lib/activate/activate.h"
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#ifdef UDEV_SYNC_SUPPORT
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#include <libudev.h>
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#include "lib/device/dev-ext-udev-constants.h"
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#endif
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#ifdef __linux__
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#include <dirent.h>
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#define MPATH_PREFIX "mpath-"
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static const char *_get_sysfs_name(struct device *dev)
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{
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const char *name;
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if (!(name = strrchr(dev_name(dev), '/'))) {
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log_error("Cannot find '/' in device name.");
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return NULL;
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}
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name++;
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if (!*name) {
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log_error("Device name is not valid.");
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return NULL;
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}
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return name;
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}
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static const char *_get_sysfs_name_by_devt(const char *sysfs_dir, dev_t devno,
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char *buf, size_t buf_size)
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{
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const char *name;
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char path[PATH_MAX];
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int size;
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if (dm_snprintf(path, sizeof(path), "%s/dev/block/%d:%d", sysfs_dir,
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(int) MAJOR(devno), (int) MINOR(devno)) < 0) {
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log_error("Sysfs path string is too long.");
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return NULL;
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}
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if ((size = readlink(path, buf, buf_size - 1)) < 0) {
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log_sys_error("readlink", path);
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return NULL;
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}
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buf[size] = '\0';
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if (!(name = strrchr(buf, '/'))) {
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log_error("Cannot find device name in sysfs path.");
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return NULL;
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}
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name++;
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return name;
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}
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static int _get_sysfs_string(const char *path, char *buffer, int max_size)
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{
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FILE *fp;
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int r = 0;
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if (!(fp = fopen(path, "r"))) {
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log_sys_error("fopen", path);
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return 0;
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}
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if (!fgets(buffer, max_size, fp))
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log_sys_error("fgets", path);
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else
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r = 1;
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if (fclose(fp))
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log_sys_error("fclose", path);
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return r;
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}
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static int _get_sysfs_get_major_minor(const char *sysfs_dir, const char *kname, int *major, int *minor)
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{
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char path[PATH_MAX], buffer[64];
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if (dm_snprintf(path, sizeof(path), "%s/block/%s/dev", sysfs_dir, kname) < 0) {
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log_error("Sysfs path string is too long.");
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return 0;
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}
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if (!_get_sysfs_string(path, buffer, sizeof(buffer)))
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return_0;
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if (sscanf(buffer, "%d:%d", major, minor) != 2) {
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log_error("Failed to parse major minor from %s", buffer);
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return 0;
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}
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return 1;
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}
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static int _get_parent_mpath(const char *dir, char *name, int max_size)
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{
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struct dirent *d;
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DIR *dr;
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int r = 0;
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if (!(dr = opendir(dir))) {
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log_sys_error("opendir", dir);
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return 0;
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}
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*name = '\0';
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while ((d = readdir(dr))) {
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if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
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continue;
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/* There should be only one holder if it is multipath */
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if (*name) {
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r = 0;
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break;
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}
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strncpy(name, d->d_name, max_size);
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r = 1;
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}
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if (closedir(dr))
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log_sys_error("closedir", dir);
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return r;
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}
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#ifdef UDEV_SYNC_SUPPORT
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static int _udev_dev_is_mpath(struct device *dev)
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{
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const char *value;
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struct dev_ext *ext;
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if (!(ext = dev_ext_get(dev)))
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return_0;
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value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_BLKID_TYPE);
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if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_MPATH))
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return 1;
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value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_MPATH_DEVICE_PATH);
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if (value && !strcmp(value, "1"))
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return 1;
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return 0;
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}
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#else
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static int _udev_dev_is_mpath(struct device *dev)
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{
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return 0;
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}
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#endif
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static int _native_dev_is_mpath(struct dev_filter *f, struct device *dev)
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{
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struct dev_types *dt = (struct dev_types *) f->private;
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const char *part_name, *name;
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struct stat info;
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char path[PATH_MAX], parent_name[PATH_MAX];
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const char *sysfs_dir = dm_sysfs_dir();
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int major = MAJOR(dev->dev);
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int minor = MINOR(dev->dev);
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dev_t primary_dev;
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/* Limit this filter only to SCSI devices */
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if (!major_is_scsi_device(dt, MAJOR(dev->dev)))
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return 0;
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switch (dev_get_primary_dev(dt, dev, &primary_dev)) {
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case 2: /* The dev is partition. */
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part_name = dev_name(dev); /* name of original dev for log_debug msg */
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if (!(name = _get_sysfs_name_by_devt(sysfs_dir, primary_dev, parent_name, sizeof(parent_name))))
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return_0;
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log_debug_devs("%s: Device is a partition, using primary "
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"device %s for mpath component detection",
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part_name, name);
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break;
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case 1: /* The dev is already a primary dev. Just continue with the dev. */
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if (!(name = _get_sysfs_name(dev)))
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return_0;
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break;
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default: /* 0, error. */
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log_error("Failed to get primary device for %d:%d.", major, minor);
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return 0;
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}
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if (dm_snprintf(path, sizeof(path), "%s/block/%s/holders", sysfs_dir, name) < 0) {
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log_error("Sysfs path to check mpath is too long.");
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return 0;
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}
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/* also will filter out partitions */
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if (stat(path, &info))
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return 0;
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if (!S_ISDIR(info.st_mode)) {
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log_error("Path %s is not a directory.", path);
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return 0;
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}
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if (!_get_parent_mpath(path, parent_name, sizeof(parent_name)))
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return 0;
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if (!_get_sysfs_get_major_minor(sysfs_dir, parent_name, &major, &minor))
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return_0;
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if (major != dt->device_mapper_major)
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return 0;
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return lvm_dm_prefix_check(major, minor, MPATH_PREFIX);
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}
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static int _dev_is_mpath(struct dev_filter *f, struct device *dev)
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{
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if (dev->ext.src == DEV_EXT_NONE)
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return _native_dev_is_mpath(f, dev);
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if (dev->ext.src == DEV_EXT_UDEV)
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return _udev_dev_is_mpath(dev);
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log_error(INTERNAL_ERROR "Missing hook for mpath recognition "
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"using external device info source %s", dev_ext_name(dev));
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return 0;
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}
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#define MSG_SKIPPING "%s: Skipping mpath component device"
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static int _ignore_mpath(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
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{
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if (_dev_is_mpath(f, dev) == 1) {
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if (dev->ext.src == DEV_EXT_NONE)
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log_debug_devs(MSG_SKIPPING, dev_name(dev));
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else
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log_debug_devs(MSG_SKIPPING " [%s:%p]", dev_name(dev),
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dev_ext_name(dev), dev->ext.handle);
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return 0;
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}
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return 1;
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}
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static void _destroy(struct dev_filter *f)
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{
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if (f->use_count)
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log_error(INTERNAL_ERROR "Destroying mpath filter while in use %u times.", f->use_count);
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free(f);
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}
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struct dev_filter *mpath_filter_create(struct dev_types *dt)
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{
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const char *sysfs_dir = dm_sysfs_dir();
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struct dev_filter *f;
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if (!*sysfs_dir) {
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log_verbose("No proc filesystem found: skipping multipath filter");
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return NULL;
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}
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if (!(f = zalloc(sizeof(*f)))) {
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log_error("mpath filter allocation failed");
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return NULL;
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}
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f->passes_filter = _ignore_mpath;
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f->destroy = _destroy;
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f->use_count = 0;
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f->private = dt;
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f->name = "mpath";
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log_debug_devs("mpath filter initialised.");
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return f;
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}
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#else
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struct dev_filter *mpath_filter_create(struct dev_types *dt)
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{
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return NULL;
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}
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#endif
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