genhd.h 14 KB

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  1. #ifndef _LINUX_GENHD_H
  2. #define _LINUX_GENHD_H
  3. /*
  4. * genhd.h Copyright (C) 1992 Drew Eckhardt
  5. * Generic hard disk header file by
  6. * Drew Eckhardt
  7. *
  8. * <drew@colorado.edu>
  9. */
  10. #include <linux/types.h>
  11. #ifdef CONFIG_BLOCK
  12. enum {
  13. /* These three have identical behaviour; use the second one if DOS FDISK gets
  14. confused about extended/logical partitions starting past cylinder 1023. */
  15. DOS_EXTENDED_PARTITION = 5,
  16. LINUX_EXTENDED_PARTITION = 0x85,
  17. WIN98_EXTENDED_PARTITION = 0x0f,
  18. SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
  19. LINUX_SWAP_PARTITION = 0x82,
  20. LINUX_DATA_PARTITION = 0x83,
  21. LINUX_LVM_PARTITION = 0x8e,
  22. LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
  23. SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
  24. NEW_SOLARIS_X86_PARTITION = 0xbf,
  25. DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
  26. DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
  27. DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
  28. EZD_PARTITION = 0x55, /* EZ-DRIVE */
  29. FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
  30. OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
  31. NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
  32. BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
  33. MINIX_PARTITION = 0x81, /* Minix Partition ID */
  34. UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
  35. };
  36. #ifndef __KERNEL__
  37. struct partition {
  38. unsigned char boot_ind; /* 0x80 - active */
  39. unsigned char head; /* starting head */
  40. unsigned char sector; /* starting sector */
  41. unsigned char cyl; /* starting cylinder */
  42. unsigned char sys_ind; /* What partition type */
  43. unsigned char end_head; /* end head */
  44. unsigned char end_sector; /* end sector */
  45. unsigned char end_cyl; /* end cylinder */
  46. unsigned int start_sect; /* starting sector counting from 0 */
  47. unsigned int nr_sects; /* nr of sectors in partition */
  48. } __attribute__((packed));
  49. #endif
  50. #ifdef __KERNEL__
  51. #include <linux/major.h>
  52. #include <linux/device.h>
  53. #include <linux/smp.h>
  54. #include <linux/string.h>
  55. #include <linux/fs.h>
  56. struct partition {
  57. unsigned char boot_ind; /* 0x80 - active */
  58. unsigned char head; /* starting head */
  59. unsigned char sector; /* starting sector */
  60. unsigned char cyl; /* starting cylinder */
  61. unsigned char sys_ind; /* What partition type */
  62. unsigned char end_head; /* end head */
  63. unsigned char end_sector; /* end sector */
  64. unsigned char end_cyl; /* end cylinder */
  65. __le32 start_sect; /* starting sector counting from 0 */
  66. __le32 nr_sects; /* nr of sectors in partition */
  67. } __attribute__((packed));
  68. struct hd_struct {
  69. sector_t start_sect;
  70. sector_t nr_sects;
  71. struct kobject kobj;
  72. struct kobject *holder_dir;
  73. unsigned ios[2], sectors[2]; /* READs and WRITEs */
  74. int policy, partno;
  75. #ifdef CONFIG_FAIL_MAKE_REQUEST
  76. int make_it_fail;
  77. #endif
  78. };
  79. #define GENHD_FL_REMOVABLE 1
  80. #define GENHD_FL_DRIVERFS 2
  81. #define GENHD_FL_CD 8
  82. #define GENHD_FL_UP 16
  83. #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
  84. #define GENHD_FL_FAIL 64
  85. struct disk_stats {
  86. unsigned long sectors[2]; /* READs and WRITEs */
  87. unsigned long ios[2];
  88. unsigned long merges[2];
  89. unsigned long ticks[2];
  90. unsigned long io_ticks;
  91. unsigned long time_in_queue;
  92. };
  93. struct gendisk {
  94. int major; /* major number of driver */
  95. int first_minor;
  96. int minors; /* maximum number of minors, =1 for
  97. * disks that can't be partitioned. */
  98. char disk_name[32]; /* name of major driver */
  99. struct hd_struct **part; /* [indexed by minor] */
  100. int part_uevent_suppress;
  101. struct block_device_operations *fops;
  102. struct request_queue *queue;
  103. void *private_data;
  104. sector_t capacity;
  105. int flags;
  106. struct device *driverfs_dev;
  107. struct kobject kobj;
  108. struct kobject *holder_dir;
  109. struct kobject *slave_dir;
  110. struct timer_rand_state *random;
  111. int policy;
  112. atomic_t sync_io; /* RAID */
  113. unsigned long stamp;
  114. int in_flight;
  115. #ifdef CONFIG_SMP
  116. struct disk_stats *dkstats;
  117. #else
  118. struct disk_stats dkstats;
  119. #endif
  120. };
  121. /* Structure for sysfs attributes on block devices */
  122. struct disk_attribute {
  123. struct attribute attr;
  124. ssize_t (*show)(struct gendisk *, char *);
  125. ssize_t (*store)(struct gendisk *, const char *, size_t);
  126. };
  127. /*
  128. * Macros to operate on percpu disk statistics:
  129. *
  130. * The __ variants should only be called in critical sections. The full
  131. * variants disable/enable preemption.
  132. */
  133. #ifdef CONFIG_SMP
  134. #define __disk_stat_add(gendiskp, field, addnd) \
  135. (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
  136. #define disk_stat_read(gendiskp, field) \
  137. ({ \
  138. typeof(gendiskp->dkstats->field) res = 0; \
  139. int i; \
  140. for_each_possible_cpu(i) \
  141. res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
  142. res; \
  143. })
  144. static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
  145. int i;
  146. for_each_possible_cpu(i)
  147. memset(per_cpu_ptr(gendiskp->dkstats, i), value,
  148. sizeof (struct disk_stats));
  149. }
  150. #else
  151. #define __disk_stat_add(gendiskp, field, addnd) \
  152. (gendiskp->dkstats.field += addnd)
  153. #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
  154. static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
  155. memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
  156. }
  157. #endif
  158. #define disk_stat_add(gendiskp, field, addnd) \
  159. do { \
  160. preempt_disable(); \
  161. __disk_stat_add(gendiskp, field, addnd); \
  162. preempt_enable(); \
  163. } while (0)
  164. #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
  165. #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
  166. #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
  167. #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
  168. #define __disk_stat_sub(gendiskp, field, subnd) \
  169. __disk_stat_add(gendiskp, field, -subnd)
  170. #define disk_stat_sub(gendiskp, field, subnd) \
  171. disk_stat_add(gendiskp, field, -subnd)
  172. /* Inlines to alloc and free disk stats in struct gendisk */
  173. #ifdef CONFIG_SMP
  174. static inline int init_disk_stats(struct gendisk *disk)
  175. {
  176. disk->dkstats = alloc_percpu(struct disk_stats);
  177. if (!disk->dkstats)
  178. return 0;
  179. return 1;
  180. }
  181. static inline void free_disk_stats(struct gendisk *disk)
  182. {
  183. free_percpu(disk->dkstats);
  184. }
  185. #else /* CONFIG_SMP */
  186. static inline int init_disk_stats(struct gendisk *disk)
  187. {
  188. return 1;
  189. }
  190. static inline void free_disk_stats(struct gendisk *disk)
  191. {
  192. }
  193. #endif /* CONFIG_SMP */
  194. /* drivers/block/ll_rw_blk.c */
  195. extern void disk_round_stats(struct gendisk *disk);
  196. /* drivers/block/genhd.c */
  197. extern int get_blkdev_list(char *, int);
  198. extern void add_disk(struct gendisk *disk);
  199. extern void del_gendisk(struct gendisk *gp);
  200. extern void unlink_gendisk(struct gendisk *gp);
  201. extern struct gendisk *get_gendisk(dev_t dev, int *part);
  202. extern void set_device_ro(struct block_device *bdev, int flag);
  203. extern void set_disk_ro(struct gendisk *disk, int flag);
  204. /* drivers/char/random.c */
  205. extern void add_disk_randomness(struct gendisk *disk);
  206. extern void rand_initialize_disk(struct gendisk *disk);
  207. static inline sector_t get_start_sect(struct block_device *bdev)
  208. {
  209. return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
  210. }
  211. static inline sector_t get_capacity(struct gendisk *disk)
  212. {
  213. return disk->capacity;
  214. }
  215. static inline void set_capacity(struct gendisk *disk, sector_t size)
  216. {
  217. disk->capacity = size;
  218. }
  219. #endif /* __KERNEL__ */
  220. #ifdef CONFIG_SOLARIS_X86_PARTITION
  221. #define SOLARIS_X86_NUMSLICE 8
  222. #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
  223. struct solaris_x86_slice {
  224. __le16 s_tag; /* ID tag of partition */
  225. __le16 s_flag; /* permission flags */
  226. __le32 s_start; /* start sector no of partition */
  227. __le32 s_size; /* # of blocks in partition */
  228. };
  229. struct solaris_x86_vtoc {
  230. unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
  231. __le32 v_sanity; /* to verify vtoc sanity */
  232. __le32 v_version; /* layout version */
  233. char v_volume[8]; /* volume name */
  234. __le16 v_sectorsz; /* sector size in bytes */
  235. __le16 v_nparts; /* number of partitions */
  236. unsigned int v_reserved[10]; /* free space */
  237. struct solaris_x86_slice
  238. v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
  239. unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
  240. char v_asciilabel[128]; /* for compatibility */
  241. };
  242. #endif /* CONFIG_SOLARIS_X86_PARTITION */
  243. #ifdef CONFIG_BSD_DISKLABEL
  244. /*
  245. * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
  246. * updated by Marc Espie <Marc.Espie@openbsd.org>
  247. */
  248. /* check against BSD src/sys/sys/disklabel.h for consistency */
  249. #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
  250. #define BSD_MAXPARTITIONS 16
  251. #define OPENBSD_MAXPARTITIONS 16
  252. #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
  253. struct bsd_disklabel {
  254. __le32 d_magic; /* the magic number */
  255. __s16 d_type; /* drive type */
  256. __s16 d_subtype; /* controller/d_type specific */
  257. char d_typename[16]; /* type name, e.g. "eagle" */
  258. char d_packname[16]; /* pack identifier */
  259. __u32 d_secsize; /* # of bytes per sector */
  260. __u32 d_nsectors; /* # of data sectors per track */
  261. __u32 d_ntracks; /* # of tracks per cylinder */
  262. __u32 d_ncylinders; /* # of data cylinders per unit */
  263. __u32 d_secpercyl; /* # of data sectors per cylinder */
  264. __u32 d_secperunit; /* # of data sectors per unit */
  265. __u16 d_sparespertrack; /* # of spare sectors per track */
  266. __u16 d_sparespercyl; /* # of spare sectors per cylinder */
  267. __u32 d_acylinders; /* # of alt. cylinders per unit */
  268. __u16 d_rpm; /* rotational speed */
  269. __u16 d_interleave; /* hardware sector interleave */
  270. __u16 d_trackskew; /* sector 0 skew, per track */
  271. __u16 d_cylskew; /* sector 0 skew, per cylinder */
  272. __u32 d_headswitch; /* head switch time, usec */
  273. __u32 d_trkseek; /* track-to-track seek, usec */
  274. __u32 d_flags; /* generic flags */
  275. #define NDDATA 5
  276. __u32 d_drivedata[NDDATA]; /* drive-type specific information */
  277. #define NSPARE 5
  278. __u32 d_spare[NSPARE]; /* reserved for future use */
  279. __le32 d_magic2; /* the magic number (again) */
  280. __le16 d_checksum; /* xor of data incl. partitions */
  281. /* filesystem and partition information: */
  282. __le16 d_npartitions; /* number of partitions in following */
  283. __le32 d_bbsize; /* size of boot area at sn0, bytes */
  284. __le32 d_sbsize; /* max size of fs superblock, bytes */
  285. struct bsd_partition { /* the partition table */
  286. __le32 p_size; /* number of sectors in partition */
  287. __le32 p_offset; /* starting sector */
  288. __le32 p_fsize; /* filesystem basic fragment size */
  289. __u8 p_fstype; /* filesystem type, see below */
  290. __u8 p_frag; /* filesystem fragments per block */
  291. __le16 p_cpg; /* filesystem cylinders per group */
  292. } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
  293. };
  294. #endif /* CONFIG_BSD_DISKLABEL */
  295. #ifdef CONFIG_UNIXWARE_DISKLABEL
  296. /*
  297. * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
  298. * and Krzysztof G. Baranowski <kgb@knm.org.pl>
  299. */
  300. #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
  301. #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
  302. #define UNIXWARE_NUMSLICE 16
  303. #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
  304. struct unixware_slice {
  305. __le16 s_label; /* label */
  306. __le16 s_flags; /* permission flags */
  307. __le32 start_sect; /* starting sector */
  308. __le32 nr_sects; /* number of sectors in slice */
  309. };
  310. struct unixware_disklabel {
  311. __le32 d_type; /* drive type */
  312. __le32 d_magic; /* the magic number */
  313. __le32 d_version; /* version number */
  314. char d_serial[12]; /* serial number of the device */
  315. __le32 d_ncylinders; /* # of data cylinders per device */
  316. __le32 d_ntracks; /* # of tracks per cylinder */
  317. __le32 d_nsectors; /* # of data sectors per track */
  318. __le32 d_secsize; /* # of bytes per sector */
  319. __le32 d_part_start; /* # of first sector of this partition */
  320. __le32 d_unknown1[12]; /* ? */
  321. __le32 d_alt_tbl; /* byte offset of alternate table */
  322. __le32 d_alt_len; /* byte length of alternate table */
  323. __le32 d_phys_cyl; /* # of physical cylinders per device */
  324. __le32 d_phys_trk; /* # of physical tracks per cylinder */
  325. __le32 d_phys_sec; /* # of physical sectors per track */
  326. __le32 d_phys_bytes; /* # of physical bytes per sector */
  327. __le32 d_unknown2; /* ? */
  328. __le32 d_unknown3; /* ? */
  329. __le32 d_pad[8]; /* pad */
  330. struct unixware_vtoc {
  331. __le32 v_magic; /* the magic number */
  332. __le32 v_version; /* version number */
  333. char v_name[8]; /* volume name */
  334. __le16 v_nslices; /* # of slices */
  335. __le16 v_unknown1; /* ? */
  336. __le32 v_reserved[10]; /* reserved */
  337. struct unixware_slice
  338. v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
  339. } vtoc;
  340. }; /* 408 */
  341. #endif /* CONFIG_UNIXWARE_DISKLABEL */
  342. #ifdef CONFIG_MINIX_SUBPARTITION
  343. # define MINIX_NR_SUBPARTITIONS 4
  344. #endif /* CONFIG_MINIX_SUBPARTITION */
  345. #ifdef __KERNEL__
  346. #define ADDPART_FLAG_NONE 0
  347. #define ADDPART_FLAG_RAID 1
  348. #define ADDPART_FLAG_WHOLEDISK 2
  349. char *disk_name (struct gendisk *hd, int part, char *buf);
  350. extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
  351. extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
  352. extern void delete_partition(struct gendisk *, int);
  353. extern struct gendisk *alloc_disk_node(int minors, int node_id);
  354. extern struct gendisk *alloc_disk(int minors);
  355. extern struct kobject *get_disk(struct gendisk *disk);
  356. extern void put_disk(struct gendisk *disk);
  357. extern void blk_register_region(dev_t dev, unsigned long range,
  358. struct module *module,
  359. struct kobject *(*probe)(dev_t, int *, void *),
  360. int (*lock)(dev_t, void *),
  361. void *data);
  362. extern void blk_unregister_region(dev_t dev, unsigned long range);
  363. static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
  364. {
  365. return bdget(MKDEV(disk->major, disk->first_minor) + index);
  366. }
  367. #endif
  368. #endif
  369. #endif