include/sysfs.h

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  *
   5  * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
   6  */
   7 #ifndef UTIL_LINUX_SYSFS_H
   8 #define UTIL_LINUX_SYSFS_H
   9
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <stdint.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <string.h>
  19 #include <inttypes.h>
  20 #include <dirent.h>
  21
  22 #include "path.h"
  23
  24 /**
  25  * sysfs_devname_sys_to_dev:
  26  * @name: devname to be converted in place
  27  *
  28  * Linux kernel linux/drivers/base/core.c: device_get_devnode()
  29  * defines a replacement of '!' in the /sys device name by '/' in the
  30  * /dev device name. This helper replaces all occurrences of '!' in
  31  * @name by '/' to convert from /sys to /dev.
  32  */
  33 static inline void sysfs_devname_sys_to_dev(char *name)
  34 {
  35         char *c;
  36
  37         if (name)
  38                 while ((c = strchr(name, '!')))
  39                         c[0] = '/';
  40 }
  41
  42 /**
  43  * sysfs_devname_dev_to_sys:
  44  * @name: devname to be converted in place
  45  *
  46  * See sysfs_devname_sys_to_dev().
  47  */
  48 static inline void sysfs_devname_dev_to_sys(char *name)
  49 {
  50         char *c;
  51
  52         if (name)
  53                 while ((c = strchr(name, '/')))
  54                         c[0] = '!';
  55 }
  56
  57 struct sysfs_blkdev {
  58         dev_t   devno;
  59         struct path_cxt *parent;
  60
  61         unsigned int    scsi_host,
  62                         scsi_channel,
  63                         scsi_target,
  64                         scsi_lun;
  65
  66         unsigned int    has_hctl   : 1,
  67                         hctl_error : 1 ;
  68 };
  69
  70 void ul_sysfs_init_debug(void);
  71
  72 struct path_cxt *ul_new_sysfs_path(dev_t devno, struct path_cxt *parent, const char *prefix);
  73 int sysfs_blkdev_init_path(struct path_cxt *pc, dev_t devno, struct path_cxt *parent);
  74
  75 int sysfs_blkdev_set_parent(struct path_cxt *pc, struct path_cxt *parent);
  76 struct path_cxt *sysfs_blkdev_get_parent(struct path_cxt *pc);
  77
  78 char *sysfs_blkdev_get_name(struct path_cxt *pc, char *buf, size_t bufsiz);
  79 int sysfs_blkdev_is_partition_dirent(DIR *dir, struct dirent *d, const char *parent_name);
  80 int sysfs_blkdev_count_partitions(struct path_cxt *pc, const char *devname);
  81 dev_t sysfs_blkdev_partno_to_devno(struct path_cxt *pc, int partno);
  82 char *sysfs_blkdev_get_slave(struct path_cxt *pc);
  83 char *sysfs_blkdev_get_path(struct path_cxt *pc, char *buf, size_t bufsiz);
  84 dev_t sysfs_blkdev_get_devno(struct path_cxt *pc);
  85
  86 char *sysfs_blkdev_get_devchain(struct path_cxt *pc, char *buf, size_t bufsz);
  87 int sysfs_blkdev_next_subsystem(struct path_cxt *pc __attribute__((unused)), char *devchain, char **subsys);
  88
  89 int sysfs_blkdev_is_hotpluggable(struct path_cxt *pc);
  90 int sysfs_blkdev_is_removable(struct path_cxt *pc);
  91 int sysfs_blkdev_get_wholedisk( struct path_cxt *pc,
  92                                 char *diskname,
  93                                 size_t len,
  94                                 dev_t *diskdevno);
  95
  96 int sysfs_devno_to_wholedisk(dev_t dev, char *diskname,
  97                              size_t len, dev_t *diskdevno);
  98 int sysfs_devno_is_dm_private(dev_t devno, char **uuid);
  99 int sysfs_devno_is_wholedisk(dev_t devno);
 100
 101 dev_t sysfs_devname_to_devno(const char *name);
 102 dev_t __sysfs_devname_to_devno(const char *prefix, const char *name, const char *parent);
 103 int sysfs_devname_is_hidden(const char *prefix, const char *name);
 104
 105 char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz);
 106 char *sysfs_devno_to_devname(dev_t devno, char *buf, size_t bufsiz);
 107 int sysfs_devno_count_partitions(dev_t devno);
 108
 109 int sysfs_blkdev_scsi_get_hctl(struct path_cxt *pc, int *h, int *c, int *t, int *l);
 110 char *sysfs_blkdev_scsi_host_strdup_attribute(struct path_cxt *pc,
 111                         const char *type, const char *attr);
 112 int sysfs_blkdev_scsi_host_is(struct path_cxt *pc, const char *type);
 113 int sysfs_blkdev_scsi_has_attribute(struct path_cxt *pc, const char *attr);
 114 int sysfs_blkdev_scsi_path_contains(struct path_cxt *pc, const char *pattern);
 115
 116 char *sysfs_chrdev_devno_to_devname(dev_t devno, char *buf, size_t bufsiz);
 117
 118 enum sysfs_byteorder {
 119         SYSFS_BYTEORDER_LITTLE,
 120         SYSFS_BYTEORDER_BIG,
 121 };
 122
 123 extern enum sysfs_byteorder sysfs_get_byteorder(struct path_cxt *pc);
 124 extern int sysfs_get_address_bits(struct path_cxt *pc);
 125
 126 #endif /* UTIL_LINUX_SYSFS_H */