5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
12 #include <linux/types.h>
17 /* These three have identical behaviour; use the second one if DOS FDISK gets
18 confused about extended/logical partitions starting past cylinder 1023. */
19 DOS_EXTENDED_PARTITION = 5,
20 LINUX_EXTENDED_PARTITION = 0x85,
21 WIN98_EXTENDED_PARTITION = 0x0f,
23 LINUX_SWAP_PARTITION = 0x82,
24 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
26 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
27 NEW_SOLARIS_X86_PARTITION = 0xbf,
29 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
30 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
31 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
32 EZD_PARTITION = 0x55, /* EZ-DRIVE */
34 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
35 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
36 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
37 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
38 MINIX_PARTITION = 0x81, /* Minix Partition ID */
39 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
45 unsigned char boot_ind; /* 0x80 - active */
46 unsigned char head; /* starting head */
47 unsigned char sector; /* starting sector */
48 unsigned char cyl; /* starting cylinder */
49 unsigned char sys_ind; /* What partition type */
50 unsigned char end_head; /* end head */
51 unsigned char end_sector; /* end sector */
52 unsigned char end_cyl; /* end cylinder */
53 unsigned int start_sect; /* starting sector counting from 0 */
54 unsigned int nr_sects; /* nr of sectors in partition */
55 } __attribute__((packed));
60 #include <linux/major.h>
61 #include <linux/device.h>
62 #include <linux/smp.h>
63 #include <linux/string.h>
67 unsigned char boot_ind; /* 0x80 - active */
68 unsigned char head; /* starting head */
69 unsigned char sector; /* starting sector */
70 unsigned char cyl; /* starting cylinder */
71 unsigned char sys_ind; /* What partition type */
72 unsigned char end_head; /* end head */
73 unsigned char end_sector; /* end sector */
74 unsigned char end_cyl; /* end cylinder */
75 __le32 start_sect; /* starting sector counting from 0 */
76 __le32 nr_sects; /* nr of sectors in partition */
77 } __attribute__((packed));
83 struct kobject *holder_dir;
84 unsigned ios[2], sectors[2]; /* READs and WRITEs */
88 #define GENHD_FL_REMOVABLE 1
89 #define GENHD_FL_DRIVERFS 2
91 #define GENHD_FL_UP 16
92 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
95 unsigned long sectors[2]; /* READs and WRITEs */
97 unsigned long merges[2];
98 unsigned long ticks[2];
99 unsigned long io_ticks;
100 unsigned long time_in_queue;
104 int major; /* major number of driver */
106 int minors; /* maximum number of minors, =1 for
107 * disks that can't be partitioned. */
108 char disk_name[32]; /* name of major driver */
109 struct hd_struct **part; /* [indexed by minor] */
110 int part_uevent_suppress;
111 struct block_device_operations *fops;
112 struct request_queue *queue;
117 struct device *driverfs_dev;
119 struct kobject *holder_dir;
120 struct kobject *slave_dir;
122 struct timer_rand_state *random;
125 atomic_t sync_io; /* RAID */
129 struct disk_stats *dkstats;
131 struct disk_stats dkstats;
135 /* Structure for sysfs attributes on block devices */
136 struct disk_attribute {
137 struct attribute attr;
138 ssize_t (*show)(struct gendisk *, char *);
139 ssize_t (*store)(struct gendisk *, const char *, size_t);
143 * Macros to operate on percpu disk statistics:
145 * The __ variants should only be called in critical sections. The full
146 * variants disable/enable preemption.
149 #define __disk_stat_add(gendiskp, field, addnd) \
150 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
152 #define disk_stat_read(gendiskp, field) \
154 typeof(gendiskp->dkstats->field) res = 0; \
156 for_each_possible_cpu(i) \
157 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
161 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
163 for_each_possible_cpu(i)
164 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
165 sizeof (struct disk_stats));
169 #define __disk_stat_add(gendiskp, field, addnd) \
170 (gendiskp->dkstats.field += addnd)
171 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
173 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
174 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
178 #define disk_stat_add(gendiskp, field, addnd) \
181 __disk_stat_add(gendiskp, field, addnd); \
185 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
186 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
188 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
189 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
191 #define __disk_stat_sub(gendiskp, field, subnd) \
192 __disk_stat_add(gendiskp, field, -subnd)
193 #define disk_stat_sub(gendiskp, field, subnd) \
194 disk_stat_add(gendiskp, field, -subnd)
197 /* Inlines to alloc and free disk stats in struct gendisk */
199 static inline int init_disk_stats(struct gendisk *disk)
201 disk->dkstats = alloc_percpu(struct disk_stats);
207 static inline void free_disk_stats(struct gendisk *disk)
209 free_percpu(disk->dkstats);
211 #else /* CONFIG_SMP */
212 static inline int init_disk_stats(struct gendisk *disk)
217 static inline void free_disk_stats(struct gendisk *disk)
220 #endif /* CONFIG_SMP */
222 /* drivers/block/ll_rw_blk.c */
223 extern void disk_round_stats(struct gendisk *disk);
225 /* drivers/block/genhd.c */
226 extern int get_blkdev_list(char *, int);
227 extern void add_disk(struct gendisk *disk);
228 extern void del_gendisk(struct gendisk *gp);
229 extern void unlink_gendisk(struct gendisk *gp);
230 extern struct gendisk *get_gendisk(dev_t dev, int *part);
232 extern void set_device_ro(struct block_device *bdev, int flag);
233 extern void set_disk_ro(struct gendisk *disk, int flag);
235 /* drivers/char/random.c */
236 extern void add_disk_randomness(struct gendisk *disk);
237 extern void rand_initialize_disk(struct gendisk *disk);
239 static inline sector_t get_start_sect(struct block_device *bdev)
241 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
243 static inline sector_t get_capacity(struct gendisk *disk)
245 return disk->capacity;
247 static inline void set_capacity(struct gendisk *disk, sector_t size)
249 disk->capacity = size;
252 #endif /* __KERNEL__ */
254 #ifdef CONFIG_SOLARIS_X86_PARTITION
256 #define SOLARIS_X86_NUMSLICE 8
257 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
259 struct solaris_x86_slice {
260 __le16 s_tag; /* ID tag of partition */
261 __le16 s_flag; /* permission flags */
262 __le32 s_start; /* start sector no of partition */
263 __le32 s_size; /* # of blocks in partition */
266 struct solaris_x86_vtoc {
267 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
268 __le32 v_sanity; /* to verify vtoc sanity */
269 __le32 v_version; /* layout version */
270 char v_volume[8]; /* volume name */
271 __le16 v_sectorsz; /* sector size in bytes */
272 __le16 v_nparts; /* number of partitions */
273 unsigned int v_reserved[10]; /* free space */
274 struct solaris_x86_slice
275 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
276 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
277 char v_asciilabel[128]; /* for compatibility */
280 #endif /* CONFIG_SOLARIS_X86_PARTITION */
282 #ifdef CONFIG_BSD_DISKLABEL
284 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
285 * updated by Marc Espie <Marc.Espie@openbsd.org>
288 /* check against BSD src/sys/sys/disklabel.h for consistency */
290 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
291 #define BSD_MAXPARTITIONS 16
292 #define OPENBSD_MAXPARTITIONS 16
293 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
294 struct bsd_disklabel {
295 __le32 d_magic; /* the magic number */
296 __s16 d_type; /* drive type */
297 __s16 d_subtype; /* controller/d_type specific */
298 char d_typename[16]; /* type name, e.g. "eagle" */
299 char d_packname[16]; /* pack identifier */
300 __u32 d_secsize; /* # of bytes per sector */
301 __u32 d_nsectors; /* # of data sectors per track */
302 __u32 d_ntracks; /* # of tracks per cylinder */
303 __u32 d_ncylinders; /* # of data cylinders per unit */
304 __u32 d_secpercyl; /* # of data sectors per cylinder */
305 __u32 d_secperunit; /* # of data sectors per unit */
306 __u16 d_sparespertrack; /* # of spare sectors per track */
307 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
308 __u32 d_acylinders; /* # of alt. cylinders per unit */
309 __u16 d_rpm; /* rotational speed */
310 __u16 d_interleave; /* hardware sector interleave */
311 __u16 d_trackskew; /* sector 0 skew, per track */
312 __u16 d_cylskew; /* sector 0 skew, per cylinder */
313 __u32 d_headswitch; /* head switch time, usec */
314 __u32 d_trkseek; /* track-to-track seek, usec */
315 __u32 d_flags; /* generic flags */
317 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
319 __u32 d_spare[NSPARE]; /* reserved for future use */
320 __le32 d_magic2; /* the magic number (again) */
321 __le16 d_checksum; /* xor of data incl. partitions */
323 /* filesystem and partition information: */
324 __le16 d_npartitions; /* number of partitions in following */
325 __le32 d_bbsize; /* size of boot area at sn0, bytes */
326 __le32 d_sbsize; /* max size of fs superblock, bytes */
327 struct bsd_partition { /* the partition table */
328 __le32 p_size; /* number of sectors in partition */
329 __le32 p_offset; /* starting sector */
330 __le32 p_fsize; /* filesystem basic fragment size */
331 __u8 p_fstype; /* filesystem type, see below */
332 __u8 p_frag; /* filesystem fragments per block */
333 __le16 p_cpg; /* filesystem cylinders per group */
334 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
337 #endif /* CONFIG_BSD_DISKLABEL */
339 #ifdef CONFIG_UNIXWARE_DISKLABEL
341 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
342 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
345 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
346 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
347 #define UNIXWARE_NUMSLICE 16
348 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
350 struct unixware_slice {
351 __le16 s_label; /* label */
352 __le16 s_flags; /* permission flags */
353 __le32 start_sect; /* starting sector */
354 __le32 nr_sects; /* number of sectors in slice */
357 struct unixware_disklabel {
358 __le32 d_type; /* drive type */
359 __le32 d_magic; /* the magic number */
360 __le32 d_version; /* version number */
361 char d_serial[12]; /* serial number of the device */
362 __le32 d_ncylinders; /* # of data cylinders per device */
363 __le32 d_ntracks; /* # of tracks per cylinder */
364 __le32 d_nsectors; /* # of data sectors per track */
365 __le32 d_secsize; /* # of bytes per sector */
366 __le32 d_part_start; /* # of first sector of this partition */
367 __le32 d_unknown1[12]; /* ? */
368 __le32 d_alt_tbl; /* byte offset of alternate table */
369 __le32 d_alt_len; /* byte length of alternate table */
370 __le32 d_phys_cyl; /* # of physical cylinders per device */
371 __le32 d_phys_trk; /* # of physical tracks per cylinder */
372 __le32 d_phys_sec; /* # of physical sectors per track */
373 __le32 d_phys_bytes; /* # of physical bytes per sector */
374 __le32 d_unknown2; /* ? */
375 __le32 d_unknown3; /* ? */
376 __le32 d_pad[8]; /* pad */
378 struct unixware_vtoc {
379 __le32 v_magic; /* the magic number */
380 __le32 v_version; /* version number */
381 char v_name[8]; /* volume name */
382 __le16 v_nslices; /* # of slices */
383 __le16 v_unknown1; /* ? */
384 __le32 v_reserved[10]; /* reserved */
385 struct unixware_slice
386 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
391 #endif /* CONFIG_UNIXWARE_DISKLABEL */
393 #ifdef CONFIG_MINIX_SUBPARTITION
394 # define MINIX_NR_SUBPARTITIONS 4
395 #endif /* CONFIG_MINIX_SUBPARTITION */
399 char *disk_name (struct gendisk *hd, int part, char *buf);
401 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
402 extern void add_partition(struct gendisk *, int, sector_t, sector_t);
403 extern void delete_partition(struct gendisk *, int);
405 extern struct gendisk *alloc_disk_node(int minors, int node_id);
406 extern struct gendisk *alloc_disk(int minors);
407 extern struct kobject *get_disk(struct gendisk *disk);
408 extern void put_disk(struct gendisk *disk);
410 extern void blk_register_region(dev_t dev, unsigned long range,
411 struct module *module,
412 struct kobject *(*probe)(dev_t, int *, void *),
413 int (*lock)(dev_t, void *),
415 extern void blk_unregister_region(dev_t dev, unsigned long range);
417 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
419 return bdget(MKDEV(disk->major, disk->first_minor) + index);