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bigbiff bigbiffe60683a2013-02-22 20:55:50 -05001/*
2 * No copyright is claimed. This code is in the public domain; do with
3 * it what you wish.
4 *
5 * Written by Karel Zak <kzak@redhat.com>
6 */
7#ifndef BLKDEV_H
8#define BLKDEV_H
9
10#include <sys/types.h>
11#include <sys/ioctl.h>
12#ifdef HAVE_SYS_IOCCOM_H
13# include <sys/ioccom.h> /* for _IO macro on e.g. Solaris */
14#endif
15#include <fcntl.h>
16#include <unistd.h>
17
18#ifdef HAVE_SYS_MKDEV_H
19# include <sys/mkdev.h> /* major and minor on Solaris */
20#endif
21
22#define DEFAULT_SECTOR_SIZE 512
23
24#ifdef __linux__
25/* very basic ioclts, should be available everywhere */
26# ifndef BLKROSET
27# define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
28# define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
29# define BLKRRPART _IO(0x12,95) /* re-read partition table */
30# define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
31# define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
32# define BLKRASET _IO(0x12,98) /* set read ahead for block device */
33# define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
34# define BLKFRASET _IO(0x12,100) /* set filesystem (mm/filemap.c) read-ahead */
35# define BLKFRAGET _IO(0x12,101) /* get filesystem (mm/filemap.c) read-ahead */
36# define BLKSECTSET _IO(0x12,102) /* set max sectors per request (ll_rw_blk.c) */
37# define BLKSECTGET _IO(0x12,103) /* get max sectors per request (ll_rw_blk.c) */
38# define BLKSSZGET _IO(0x12,104) /* get block device sector size */
39
40/* ioctls introduced in 2.2.16, removed in 2.5.58 */
41# define BLKELVGET _IOR(0x12,106,size_t) /* elevator get */
42# define BLKELVSET _IOW(0x12,107,size_t) /* elevator set */
43
44# define BLKBSZGET _IOR(0x12,112,size_t)
45# define BLKBSZSET _IOW(0x12,113,size_t)
46# endif /* !BLKROSET */
47
48# ifndef BLKGETSIZE64
49# define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
50# endif
51
52/* block device topology ioctls, introduced in 2.6.32 (commit ac481c20) */
53# ifndef BLKIOMIN
54# define BLKIOMIN _IO(0x12,120)
55# define BLKIOOPT _IO(0x12,121)
56# define BLKALIGNOFF _IO(0x12,122)
57# define BLKPBSZGET _IO(0x12,123)
58# endif
59
60/* discard zeroes support, introduced in 2.6.33 (commit 98262f27) */
61# ifndef BLKDISCARDZEROES
62# define BLKDISCARDZEROES _IO(0x12,124)
63# endif
64
65/* filesystem freeze, introduced in 2.6.29 (commit fcccf502) */
66# ifndef FIFREEZE
67# define FIFREEZE _IOWR('X', 119, int) /* Freeze */
68# define FITHAW _IOWR('X', 120, int) /* Thaw */
69# endif
70
71/* uniform CD-ROM information */
72# ifndef CDROM_GET_CAPABILITY
73# define CDROM_GET_CAPABILITY 0x5331
74# endif
75
76#endif /* __linux */
77
78
79#ifdef APPLE_DARWIN
80# define BLKGETSIZE DKIOCGETBLOCKCOUNT32
81#endif
82
83#ifndef HDIO_GETGEO
84# ifdef __linux__
85# define HDIO_GETGEO 0x0301
86# endif
87
88struct hd_geometry {
89 unsigned char heads;
90 unsigned char sectors;
91 unsigned short cylinders; /* truncated */
92 unsigned long start;
93};
94#endif /* HDIO_GETGEO */
95
96
97/* are we working with block device? */
98int is_blkdev(int fd);
99
100/* Determine size in bytes */
101off_t blkdev_find_size (int fd);
102
103/* get size in bytes */
104int blkdev_get_size(int fd, unsigned long long *bytes);
105
106/* get 512-byte sector count */
107int blkdev_get_sectors(int fd, unsigned long long *sectors);
108
109/* get hardware sector size */
110int blkdev_get_sector_size(int fd, int *sector_size);
111
112/* specifies whether or not the device is misaligned */
113int blkdev_is_misaligned(int fd);
114
115/* get physical block device size */
116int blkdev_get_physector_size(int fd, int *sector_size);
117
118/* is the device cdrom capable? */
119int blkdev_is_cdrom(int fd);
120
121/* get device's geometry - legacy */
122int blkdev_get_geometry(int fd, unsigned int *h, unsigned int *s);
123
124/* SCSI device types. Copied almost as-is from kernel header.
125 * http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=include/scsi/scsi.h */
126#define SCSI_TYPE_DISK 0x00
127#define SCSI_TYPE_TAPE 0x01
128#define SCSI_TYPE_PRINTER 0x02
129#define SCSI_TYPE_PROCESSOR 0x03 /* HP scanners use this */
130#define SCSI_TYPE_WORM 0x04 /* Treated as ROM by our system */
131#define SCSI_TYPE_ROM 0x05
132#define SCSI_TYPE_SCANNER 0x06
133#define SCSI_TYPE_MOD 0x07 /* Magneto-optical disk - treated as SCSI_TYPE_DISK */
134#define SCSI_TYPE_MEDIUM_CHANGER 0x08
135#define SCSI_TYPE_COMM 0x09 /* Communications device */
136#define SCSI_TYPE_RAID 0x0c
137#define SCSI_TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
138#define SCSI_TYPE_RBC 0x0e
139#define SCSI_TYPE_OSD 0x11
140#define SCSI_TYPE_NO_LUN 0x7f
141
142/* convert scsi type code to name */
143const char *blkdev_scsi_type_to_name(int type);
144
145
146#endif /* BLKDEV_H */