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