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Add support for devid and phys_path keys in vdev disk labels
This is foundational work for ZED.
Updates a leaf vdev's persistent device strings on Linux platform
* only applies for a dedicated leaf vdev (aka whole disk)
* updated during pool create|add|attach|import
* used for matching device matching during auto-{online,expand,replace}
* stored in a leaf disk config label (i.e. alongside 'path' NVP)
* can opt-out using env var ZFS_VDEV_DEVID_OPT_OUT=YES
Some examples:
path: '/dev/sdb1'
devid: 'scsi-350000394a8ca4fbc-part1'
phys_path: 'pci-0000:04:00.0-sas-0x50000394a8ca4fbf-lun-0'
path: '/dev/mapper/mpatha'
devid: 'dm-uuid-mpath-35000c5006304de3f'
Signed-off-by: Don Brady <don.brady@intel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2856
Closes #3978
Closes #4416
This commit is contained in:
Don Brady
Brian Behlendorf
parent
bebd73f2c3
commit
39fc0cb557
@ -22,6 +22,7 @@
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2013 by Delphix. All rights reserved.
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* Copyright (c) 2016 Intel Corporation.
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*/
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/*
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@ -447,7 +448,7 @@ check_disk(const char *path, blkid_cache cache, int force,
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(void) close(fd);
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if (force) {
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/* Partitions will no be created using the backup */
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/* Partitions will now be created using the backup */
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return (0);
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} else {
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vdev_error(gettext("%s contains a corrupt primary "
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@ -1178,6 +1179,12 @@ make_disks(zpool_handle_t *zhp, nvlist_t *nv)
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&wholedisk));
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if (!wholedisk) {
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/*
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* Update device id string for mpath nodes (Linux only)
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*/
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if (is_mpath_whole_disk(path))
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update_vdev_config_dev_strs(nv);
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(void) zero_label(path);
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return (0);
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}
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@ -1249,6 +1256,12 @@ make_disks(zpool_handle_t *zhp, nvlist_t *nv)
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*/
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verify(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, udevpath) == 0);
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/*
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* Update device id strings for whole disks (Linux only)
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*/
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if (wholedisk)
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update_vdev_config_dev_strs(nv);
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return (0);
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}
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13
config/user-libudev.m4
Normal file
13
config/user-libudev.m4
Normal file
@ -0,0 +1,13 @@
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dnl #
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dnl # Check for libudev - needed for vdev auto-online and auto-replace
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_USER_LIBUDEV], [
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LIBUDEV=
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AC_CHECK_HEADER([libudev.h], [AC_SUBST([LIBUDEV], ["-ludev"])
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AC_DEFINE([HAVE_LIBUDEV], 1, [Define if you have libudev])], [])
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AC_SEARCH_LIBS(i[udev_device_get_is_initialized], [udev], [
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AC_DEFINE([HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED], 1, [
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Define if udev_device_get_is_initialized is available])], [])
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])
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@ -12,6 +12,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
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ZFS_AC_CONFIG_USER_LIBUUID
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ZFS_AC_CONFIG_USER_LIBBLKID
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ZFS_AC_CONFIG_USER_LIBATTR
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ZFS_AC_CONFIG_USER_LIBUDEV
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ZFS_AC_CONFIG_USER_FRAME_LARGER_THAN
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ZFS_AC_CONFIG_USER_RUNSTATEDIR
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@ -25,6 +25,7 @@
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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* Copyright (c) 2013 Steven Hartland. All rights reserved.
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* Copyright 2013 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2016, Intel Corporation.
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*/
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#ifndef _LIBZFS_H
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@ -801,6 +802,12 @@ extern boolean_t libzfs_fru_compare(libzfs_handle_t *, const char *,
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extern boolean_t libzfs_fru_notself(libzfs_handle_t *, const char *);
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extern int zpool_fru_set(zpool_handle_t *, uint64_t, const char *);
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/*
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* Support for Linux libudev derived persistent device strings
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*/
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extern boolean_t is_mpath_whole_disk(const char *);
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extern void update_vdev_config_dev_strs(nvlist_t *);
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#ifdef __cplusplus
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}
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#endif
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@ -28,82 +28,5 @@
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#define _LIBSPL_DEVID_H
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#include <sys/types.h>
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#include <stdlib.h>
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typedef int ddi_devid_t;
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typedef struct devid_nmlist {
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char *devname;
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dev_t dev;
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} devid_nmlist_t;
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static inline
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int
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devid_str_decode(
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char *devidstr,
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ddi_devid_t *retdevid,
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char **retminor_name)
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{
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abort();
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}
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static inline
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int
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devid_deviceid_to_nmlist(
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char *search_path,
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ddi_devid_t devid,
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char *minor_name,
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devid_nmlist_t **retlist)
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{
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abort();
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}
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static inline
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void
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devid_str_free(char *str)
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{
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abort();
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}
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static inline
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void
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devid_free(ddi_devid_t devid)
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{
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abort();
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}
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static inline
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void
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devid_free_nmlist(devid_nmlist_t *list)
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{
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abort();
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}
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static inline
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int
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devid_get(
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int fd,
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ddi_devid_t *retdevid)
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{
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return (-1);
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}
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static inline
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int
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devid_get_minor_name(
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int fd,
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char **retminor_name)
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{
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abort();
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}
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static inline
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char *
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devid_str_encode(
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ddi_devid_t devid,
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char *minor_name)
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{
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abort();
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}
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#endif
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@ -36,7 +36,7 @@ libzfs_la_LIBADD = \
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$(top_builddir)/lib/libnvpair/libnvpair.la \
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$(top_builddir)/lib/libzpool/libzpool.la
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libzfs_la_LIBADD += -lm $(LIBBLKID)
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libzfs_la_LIBADD += -lm $(LIBBLKID) $(LIBUDEV)
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libzfs_la_LDFLAGS = -version-info 2:0:0
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EXTRA_DIST = $(libzfs_pc_DATA) $(USER_C)
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@ -23,6 +23,7 @@
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012 by Delphix. All rights reserved.
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* Copyright 2015 RackTop Systems.
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* Copyright (c) 2016, Intel Corporation.
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*/
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/*
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@ -46,6 +47,10 @@
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#include <dirent.h>
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#include <errno.h>
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#include <libintl.h>
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#ifdef HAVE_LIBUDEV
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#include <libudev.h>
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#include <sched.h>
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#endif
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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@ -94,30 +99,328 @@ typedef struct pool_list {
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name_entry_t *names;
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} pool_list_t;
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static char *
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get_devid(const char *path)
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/*
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* Linux persistent device strings for vdev labels
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*
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* based on libudev for consistency with libudev disk add/remove events
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*/
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#ifdef HAVE_LIBUDEV
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#define DEV_BYID_PATH "/dev/disk/by-id/"
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typedef struct vdev_dev_strs {
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char vds_devid[128];
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char vds_devphys[128];
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} vdev_dev_strs_t;
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/*
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* Obtain the persistent device id string (describes what)
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*
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* used by ZED auto-{online,expand,replace}
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*/
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static int
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udev_device_get_devid(struct udev_device *dev, char *bufptr, size_t buflen)
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{
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int fd;
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ddi_devid_t devid;
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char *minor, *ret;
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struct udev_list_entry *entry;
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const char *bus;
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char devbyid[MAXPATHLEN];
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if ((fd = open(path, O_RDONLY)) < 0)
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return (NULL);
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/* The bus based by-id path is preferred */
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bus = udev_device_get_property_value(dev, "ID_BUS");
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minor = NULL;
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ret = NULL;
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if (devid_get(fd, &devid) == 0) {
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if (devid_get_minor_name(fd, &minor) == 0)
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ret = devid_str_encode(devid, minor);
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if (minor != NULL)
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devid_str_free(minor);
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devid_free(devid);
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if (bus == NULL) {
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const char *dm_uuid;
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/*
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* For multipath nodes use the persistent uuid based identifier
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*
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* Example: /dev/disk/by-id/dm-uuid-mpath-35000c5006304de3f
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*/
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dm_uuid = udev_device_get_property_value(dev, "DM_UUID");
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if (dm_uuid != NULL) {
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(void) snprintf(bufptr, buflen, "dm-uuid-%s", dm_uuid);
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return (0);
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}
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return (ENODATA);
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}
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(void) close(fd);
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/*
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* locate the bus specific by-id link
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*/
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(void) snprintf(devbyid, sizeof (devbyid), "%s%s-", DEV_BYID_PATH, bus);
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entry = udev_device_get_devlinks_list_entry(dev);
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while (entry != NULL) {
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const char *name;
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name = udev_list_entry_get_name(entry);
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if (strncmp(name, devbyid, strlen(devbyid)) == 0) {
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name += strlen(DEV_BYID_PATH);
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(void) strlcpy(bufptr, name, buflen);
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return (0);
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}
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entry = udev_list_entry_get_next(entry);
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}
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return (ENODATA);
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}
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/*
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* Obtain the persistent physical location string (describes where)
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*
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* used by ZED auto-{online,expand,replace}
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*/
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static int
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udev_device_get_physical(struct udev_device *dev, char *bufptr, size_t buflen)
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{
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const char *physpath, *value;
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/*
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* Skip indirect multipath device nodes
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*/
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value = udev_device_get_property_value(dev, "DM_MULTIPATH_DEVICE_PATH");
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if (value != NULL && strcmp(value, "1") == 0)
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return (ENODATA); /* skip physical for multipath nodes */
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physpath = udev_device_get_property_value(dev, "ID_PATH");
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if (physpath != NULL && physpath[0] != '\0') {
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(void) strlcpy(bufptr, physpath, buflen);
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return (0);
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}
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return (ENODATA);
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}
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/*
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* A disk is considered a multipath whole disk when:
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* DEVNAME key value has "dm-"
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* DM_NAME key value has "mpath" prefix
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* DM_UUID key exists
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* ID_PART_TABLE_TYPE key does not exist or is not gpt
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*/
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static boolean_t
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udev_mpath_whole_disk(struct udev_device *dev)
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{
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const char *devname, *mapname, *type, *uuid;
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devname = udev_device_get_property_value(dev, "DEVNAME");
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mapname = udev_device_get_property_value(dev, "DM_NAME");
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type = udev_device_get_property_value(dev, "ID_PART_TABLE_TYPE");
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uuid = udev_device_get_property_value(dev, "DM_UUID");
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if ((devname != NULL && strncmp(devname, "/dev/dm-", 8) == 0) &&
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(mapname != NULL && strncmp(mapname, "mpath", 5) == 0) &&
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((type == NULL) || (strcmp(type, "gpt") != 0)) &&
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(uuid != NULL)) {
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return (B_TRUE);
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}
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return (B_FALSE);
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}
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/*
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* Check if a disk is effectively a multipath whole disk
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*/
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boolean_t
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is_mpath_whole_disk(const char *path)
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{
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struct udev *udev;
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struct udev_device *dev = NULL;
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char nodepath[MAXPATHLEN];
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char *sysname;
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boolean_t wholedisk = B_FALSE;
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if (realpath(path, nodepath) == NULL)
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return (B_FALSE);
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sysname = strrchr(nodepath, '/') + 1;
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if (strncmp(sysname, "dm-", 3) != 0)
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return (B_FALSE);
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if ((udev = udev_new()) == NULL)
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return (B_FALSE);
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if ((dev = udev_device_new_from_subsystem_sysname(udev, "block",
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sysname)) == NULL) {
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udev_device_unref(dev);
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return (B_FALSE);
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}
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wholedisk = udev_mpath_whole_disk(dev);
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udev_device_unref(dev);
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return (wholedisk);
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}
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static int
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udev_device_is_ready(struct udev_device *dev)
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{
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#ifdef HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED
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return (udev_device_get_is_initialized(dev));
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#else
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/* wait for DEVLINKS property to be initialized */
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return (udev_device_get_property_value(dev, "DEVLINKS") != NULL);
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#endif
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}
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/*
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* Encode the persistent devices strings
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* used for the vdev disk label
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*/
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static int
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encode_device_strings(const char *path, vdev_dev_strs_t *ds,
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boolean_t wholedisk)
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{
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struct udev *udev;
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struct udev_device *dev = NULL;
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char nodepath[MAXPATHLEN];
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char *sysname;
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int ret = ENODEV;
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hrtime_t start;
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if ((udev = udev_new()) == NULL)
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return (ENXIO);
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/* resolve path to a runtime device node instance */
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if (realpath(path, nodepath) == NULL)
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goto no_dev;
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sysname = strrchr(nodepath, '/') + 1;
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|
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/*
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* Wait up to 3 seconds for udev to set up the device node context
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*/
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start = gethrtime();
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do {
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dev = udev_device_new_from_subsystem_sysname(udev, "block",
|
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sysname);
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if (dev == NULL)
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goto no_dev;
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if (udev_device_is_ready(dev))
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break; /* udev ready */
|
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|
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udev_device_unref(dev);
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dev = NULL;
|
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|
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if (NSEC2MSEC(gethrtime() - start) < 10)
|
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(void) sched_yield(); /* yield/busy wait up to 10ms */
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else
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(void) usleep(10 * MILLISEC);
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|
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} while (NSEC2MSEC(gethrtime() - start) < (3 * MILLISEC));
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|
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if (dev == NULL)
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goto no_dev;
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/*
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* Only whole disks require extra device strings
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*/
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if (!wholedisk && !udev_mpath_whole_disk(dev))
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goto no_dev;
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ret = udev_device_get_devid(dev, ds->vds_devid, sizeof (ds->vds_devid));
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if (ret != 0)
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goto no_dev_ref;
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/* physical location string (optional) */
|
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if (udev_device_get_physical(dev, ds->vds_devphys,
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sizeof (ds->vds_devphys)) != 0) {
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ds->vds_devphys[0] = '\0'; /* empty string --> not available */
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}
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|
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no_dev_ref:
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udev_device_unref(dev);
|
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no_dev:
|
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udev_unref(udev);
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|
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return (ret);
|
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}
|
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|
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/*
|
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* Update a leaf vdev's persistent device strings (Linux only)
|
||||
*
|
||||
* - only applies for a dedicated leaf vdev (aka whole disk)
|
||||
* - updated during pool create|add|attach|import
|
||||
* - used for matching device matching during auto-{online,expand,replace}
|
||||
* - stored in a leaf disk config label (i.e. alongside 'path' NVP)
|
||||
* - these strings are currently not used in kernel (i.e. for vdev_disk_open)
|
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*
|
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* single device node example:
|
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* devid: 'scsi-MG03SCA300_350000494a8cb3d67-part1'
|
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* phys_path: 'pci-0000:04:00.0-sas-0x50000394a8cb3d67-lun-0'
|
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*
|
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* multipath device node example:
|
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* devid: 'dm-uuid-mpath-35000c5006304de3f'
|
||||
*/
|
||||
void
|
||||
update_vdev_config_dev_strs(nvlist_t *nv)
|
||||
{
|
||||
vdev_dev_strs_t vds;
|
||||
char *env, *type, *path;
|
||||
uint64_t wholedisk = 0;
|
||||
|
||||
/*
|
||||
* For the benefit of legacy ZFS implementations, allow
|
||||
* for opting out of devid strings in the vdev label.
|
||||
*
|
||||
* example use:
|
||||
* env ZFS_VDEV_DEVID_OPT_OUT=YES zpool import dozer
|
||||
*
|
||||
* explanation:
|
||||
* Older ZFS on Linux implementations had issues when attempting to
|
||||
* display pool config VDEV names if a "devid" NVP value is present
|
||||
* in the pool's config.
|
||||
*
|
||||
* For example, a pool that originated on illumos platform would
|
||||
* have a devid value in the config and "zpool status" would fail
|
||||
* when listing the config.
|
||||
*
|
||||
* A pool can be stripped of any "devid" values on import or
|
||||
* prevented from adding them on zpool create|add by setting
|
||||
* ZFS_VDEV_DEVID_OPT_OUT.
|
||||
*/
|
||||
env = getenv("ZFS_VDEV_DEVID_OPT_OUT");
|
||||
if (env && (strtoul(env, NULL, 0) > 0 ||
|
||||
!strncasecmp(env, "YES", 3) || !strncasecmp(env, "ON", 2))) {
|
||||
(void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID);
|
||||
(void) nvlist_remove_all(nv, ZPOOL_CONFIG_PHYS_PATH);
|
||||
return;
|
||||
}
|
||||
|
||||
if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0 ||
|
||||
strcmp(type, VDEV_TYPE_DISK) != 0) {
|
||||
return;
|
||||
}
|
||||
if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0)
|
||||
return;
|
||||
(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, &wholedisk);
|
||||
|
||||
/*
|
||||
* Update device string values in config nvlist
|
||||
*/
|
||||
if (encode_device_strings(path, &vds, (boolean_t)wholedisk) == 0) {
|
||||
(void) nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, vds.vds_devid);
|
||||
if (vds.vds_devphys[0] != '\0') {
|
||||
(void) nvlist_add_string(nv, ZPOOL_CONFIG_PHYS_PATH,
|
||||
vds.vds_devphys);
|
||||
}
|
||||
} else {
|
||||
/* clear out any stale entries */
|
||||
(void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID);
|
||||
(void) nvlist_remove_all(nv, ZPOOL_CONFIG_PHYS_PATH);
|
||||
}
|
||||
}
|
||||
#else
|
||||
|
||||
boolean_t
|
||||
is_mpath_whole_disk(const char *path)
|
||||
{
|
||||
return (B_FALSE);
|
||||
}
|
||||
|
||||
void
|
||||
update_vdev_config_dev_strs(nvlist_t *nv)
|
||||
{
|
||||
}
|
||||
|
||||
#endif /* HAVE_LIBUDEV */
|
||||
|
||||
|
||||
/*
|
||||
* Go through and fix up any path and/or devid information for the given vdev
|
||||
@ -130,7 +433,7 @@ fix_paths(nvlist_t *nv, name_entry_t *names)
|
||||
uint_t c, children;
|
||||
uint64_t guid;
|
||||
name_entry_t *ne, *best;
|
||||
char *path, *devid;
|
||||
char *path;
|
||||
|
||||
if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
|
||||
&child, &children) == 0) {
|
||||
@ -197,15 +500,8 @@ fix_paths(nvlist_t *nv, name_entry_t *names)
|
||||
if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0)
|
||||
return (-1);
|
||||
|
||||
if ((devid = get_devid(best->ne_name)) == NULL) {
|
||||
(void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID);
|
||||
} else {
|
||||
if (nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, devid) != 0) {
|
||||
devid_str_free(devid);
|
||||
return (-1);
|
||||
}
|
||||
devid_str_free(devid);
|
||||
}
|
||||
/* Linux only - update ZPOOL_CONFIG_DEVID and ZPOOL_CONFIG_PHYS_PATH */
|
||||
update_vdev_config_dev_strs(nv);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
@ -3312,6 +3312,7 @@ zpool_reopen(zpool_handle_t *zhp)
|
||||
return (zpool_standard_error(hdl, errno, msg));
|
||||
}
|
||||
|
||||
#if defined(__sun__) || defined(__sun)
|
||||
/*
|
||||
* Convert from a devid string to a path.
|
||||
*/
|
||||
@ -3389,6 +3390,7 @@ set_path(zpool_handle_t *zhp, nvlist_t *nv, const char *path)
|
||||
|
||||
(void) ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_VDEV_SETPATH, &zc);
|
||||
}
|
||||
#endif /* sun */
|
||||
|
||||
/*
|
||||
* Remove partition suffix from a vdev path. Partition suffixes may take three
|
||||
@ -3443,12 +3445,10 @@ char *
|
||||
zpool_vdev_name(libzfs_handle_t *hdl, zpool_handle_t *zhp, nvlist_t *nv,
|
||||
int name_flags)
|
||||
{
|
||||
char *path, *devid, *type, *env;
|
||||
char *path, *type, *env;
|
||||
uint64_t value;
|
||||
char buf[PATH_BUF_LEN];
|
||||
char tmpbuf[PATH_BUF_LEN];
|
||||
vdev_stat_t *vs;
|
||||
uint_t vsc;
|
||||
|
||||
env = getenv("ZPOOL_VDEV_NAME_PATH");
|
||||
if (env && (strtoul(env, NULL, 0) > 0 ||
|
||||
@ -3471,6 +3471,15 @@ zpool_vdev_name(libzfs_handle_t *hdl, zpool_handle_t *zhp, nvlist_t *nv,
|
||||
(void) snprintf(buf, sizeof (buf), "%llu", (u_longlong_t)value);
|
||||
path = buf;
|
||||
} else if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0) {
|
||||
#if defined(__sun__) || defined(__sun)
|
||||
/*
|
||||
* Live VDEV path updates to a kernel VDEV during a
|
||||
* zpool_vdev_name lookup are not supported on Linux.
|
||||
*/
|
||||
char *devid;
|
||||
vdev_stat_t *vs;
|
||||
uint_t vsc;
|
||||
|
||||
/*
|
||||
* If the device is dead (faulted, offline, etc) then don't
|
||||
* bother opening it. Otherwise we may be forcing the user to
|
||||
@ -3508,6 +3517,7 @@ zpool_vdev_name(libzfs_handle_t *hdl, zpool_handle_t *zhp, nvlist_t *nv,
|
||||
if (newdevid)
|
||||
devid_str_free(newdevid);
|
||||
}
|
||||
#endif /* sun */
|
||||
|
||||
if (name_flags & VDEV_NAME_FOLLOW_LINKS) {
|
||||
char *rp = realpath(path, NULL);
|
||||
|
||||
@ -2603,6 +2603,17 @@ Cause \fBzpool\fR subcommands to follow links for vdev names by default. This b
|
||||
.B "ZPOOL_VDEV_NAME_PATH"
|
||||
Cause \fBzpool\fR subcommands to output full vdev path names by default. This
|
||||
behavior is identical to the \fBzpool status -p\fR command line option.
|
||||
.TP
|
||||
.B "ZFS_VDEV_DEVID_OPT_OUT"
|
||||
Older ZFS on Linux implementations had issues when attempting to display pool
|
||||
config VDEV names if a "devid" NVP value is present in the pool's config.
|
||||
|
||||
For example, a pool that originated on illumos platform would have a devid
|
||||
value in the config and \fBzpool status\fR would fail when listing the config.
|
||||
This would also be true for future Linux based pools.
|
||||
|
||||
A pool can be stripped of any "devid" values on import or prevented from adding
|
||||
them on \fBzpool create\fR or \fBzpool add\fR by setting ZFS_VDEV_DEVID_OPT_OUT.
|
||||
|
||||
.SH SEE ALSO
|
||||
.sp
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
include $(top_srcdir)/config/Rules.am
|
||||
|
||||
pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/bin
|
||||
pkgexecdir = $(datadir)/@PACKAGE@/zfs-tests/bin
|
||||
|
||||
# DISABLED: Not supported under Linux
|
||||
# pkgdata_PROGRAMS = devname2devid
|
||||
# devname2devid_SOURCES = devname2devid.c
|
||||
pkgexec_PROGRAMS = devname2devid
|
||||
devname2devid_SOURCES = devname2devid.c
|
||||
devname2devid_LDADD = -ludev
|
||||
|
||||
@ -22,27 +22,85 @@
|
||||
/*
|
||||
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
|
||||
* Use is subject to license terms.
|
||||
*
|
||||
* Copyright (c) 2016, Intel Corporation.
|
||||
*/
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/param.h>
|
||||
#include <sys/stat.h>
|
||||
#include <devid.h>
|
||||
#include <libudev.h>
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <fcntl.h>
|
||||
|
||||
/*
|
||||
* Linux persistent device strings for vdev labels
|
||||
*
|
||||
* based on udev_device_get_devid() at zfs/lib/libzfs/libzfs_import.c
|
||||
*/
|
||||
|
||||
#define DEV_BYID_PATH "/dev/disk/by-id/"
|
||||
|
||||
static int
|
||||
udev_device_get_devid(struct udev_device *dev, char *bufptr, size_t buflen)
|
||||
{
|
||||
struct udev_list_entry *entry;
|
||||
const char *bus;
|
||||
char devbyid[MAXPATHLEN];
|
||||
|
||||
/* The bus based by-id path is preferred */
|
||||
bus = udev_device_get_property_value(dev, "ID_BUS");
|
||||
|
||||
if (bus == NULL) {
|
||||
const char *dm_uuid;
|
||||
|
||||
/*
|
||||
* For multipath nodes use the persistent uuid based identifier
|
||||
*
|
||||
* Example: 'dm-uuid-mpath-35000c5006304de3f'
|
||||
*/
|
||||
dm_uuid = udev_device_get_property_value(dev, "DM_UUID");
|
||||
if (dm_uuid != NULL) {
|
||||
(void) snprintf(bufptr, buflen, "dm-uuid-%s", dm_uuid);
|
||||
return (0);
|
||||
}
|
||||
return (ENODATA);
|
||||
}
|
||||
|
||||
/*
|
||||
* locate the bus specific by-id link
|
||||
*
|
||||
* Example: 'scsi-MG03SCA300_350000494a8cb3d67-part1'
|
||||
*/
|
||||
(void) snprintf(devbyid, sizeof (devbyid), "%s%s-", DEV_BYID_PATH, bus);
|
||||
entry = udev_device_get_devlinks_list_entry(dev);
|
||||
while (entry != NULL) {
|
||||
const char *name;
|
||||
|
||||
name = udev_list_entry_get_name(entry);
|
||||
if (strncmp(name, devbyid, strlen(devbyid)) == 0) {
|
||||
name += strlen(DEV_BYID_PATH);
|
||||
(void) stpncpy(bufptr, name, buflen);
|
||||
return (0);
|
||||
}
|
||||
entry = udev_list_entry_get_next(entry);
|
||||
}
|
||||
|
||||
return (ENODATA);
|
||||
}
|
||||
|
||||
/*
|
||||
* Usage: devname2devid <devicepath>
|
||||
*
|
||||
* Examples:
|
||||
* # ./devname2devid /dev/dsk/c1t4d0s0
|
||||
* devid id1,sd@SSEAGATE_ST318404LSUN18G_3BT2G0Z300002146G4CR/a
|
||||
* # ./devname2devid /dev/dsk/c1t4d0
|
||||
* devid id1,sd@SSEAGATE_ST318404LSUN18G_3BT2G0Z300002146G4CR/wd
|
||||
* # ./devname2devid /dev/dsk/c1t4d0s1
|
||||
* devid id1,sd@SSEAGATE_ST318404LSUN18G_3BT2G0Z300002146G4CR/b
|
||||
* #
|
||||
* # ./devname2devid /dev/sda1
|
||||
* devid scsi-350000394a8caede4-part1
|
||||
*
|
||||
* # ./devname2devid /dev/dm-1
|
||||
* devid: 'dm-uuid-mpath-35000c5006304de3f'
|
||||
*
|
||||
* This program accepts a disk or disk slice path and prints a
|
||||
* device id.
|
||||
@ -55,66 +113,47 @@
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
int fd;
|
||||
ddi_devid_t devid;
|
||||
char *minor_name, *devidstr, *device;
|
||||
#ifdef DEBUG
|
||||
devid_nmlist_t *list = NULL;
|
||||
char *search_path;
|
||||
int i;
|
||||
#endif
|
||||
struct udev *udev;
|
||||
struct udev_device *dev = NULL;
|
||||
char devid[128], nodepath[MAXPATHLEN];
|
||||
char *device, *sysname;
|
||||
int ret;
|
||||
|
||||
if (argc == 1) {
|
||||
(void) printf("%s <devicepath> [search path]\n",
|
||||
argv[0]);
|
||||
(void) printf("%s <devicepath> [search path]\n", argv[0]);
|
||||
exit(1);
|
||||
}
|
||||
device = argv[1];
|
||||
|
||||
if ((fd = open(device, O_RDONLY|O_NDELAY)) < 0) {
|
||||
perror(device);
|
||||
exit(1);
|
||||
}
|
||||
if (devid_get(fd, &devid) != 0) {
|
||||
perror("devid_get");
|
||||
exit(1);
|
||||
}
|
||||
if (devid_get_minor_name(fd, &minor_name) != 0) {
|
||||
perror("devid_get_minor_name");
|
||||
exit(1);
|
||||
}
|
||||
if ((devidstr = devid_str_encode(devid, minor_name)) == 0) {
|
||||
perror("devid_str_encode");
|
||||
if ((udev = udev_new()) == NULL) {
|
||||
perror("udev_new");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
(void) printf("devid %s\n", devidstr);
|
||||
|
||||
devid_str_free(devidstr);
|
||||
|
||||
#ifdef DEBUG
|
||||
if (argc == 3) {
|
||||
search_path = argv[2];
|
||||
} else {
|
||||
search_path = "/dev/rdsk";
|
||||
/* resolve path to a runtime device node instance */
|
||||
if (realpath(device, nodepath) == NULL) {
|
||||
perror("realpath");
|
||||
exit(1);
|
||||
}
|
||||
sysname = strrchr(nodepath, '/') + 1;
|
||||
|
||||
if (devid_deviceid_to_nmlist(search_path, devid, DEVID_MINOR_NAME_ALL,
|
||||
&list)) {
|
||||
perror("devid_deviceid_to_nmlist");
|
||||
if ((dev = udev_device_new_from_subsystem_sysname(udev, "block",
|
||||
sysname)) == NULL) {
|
||||
perror(sysname);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/* loop through list and process device names and numbers */
|
||||
for (i = 0; list[i].devname != NULL; i++) {
|
||||
(void) printf("devname: %s %p\n", list[i].devname, list[i].dev);
|
||||
if ((ret = udev_device_get_devid(dev, devid, sizeof (devid))) != 0) {
|
||||
udev_device_unref(dev);
|
||||
errno = ret;
|
||||
perror(sysname);
|
||||
exit(1);
|
||||
}
|
||||
devid_free_nmlist(list);
|
||||
|
||||
#endif /* DEBUG */
|
||||
(void) printf("devid %s\n", devid);
|
||||
|
||||
devid_str_free(minor_name);
|
||||
devid_free(devid);
|
||||
udev_device_unref(dev);
|
||||
udev_unref(udev);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user