1 #ifndef _LINUX_GENHD_H
2 #define _LINUX_GENHD_H
3
4 /*
5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
7 * Drew Eckhardt
8 *
9 * <drew@colorado.edu>
10 */
11
12 #include <linux/types.h>
13
14 enum {
15 /* These three have identical behaviour; use the second one if DOS FDISK gets
16 confused about extended/logical partitions starting past cylinder 1023. */
17 DOS_EXTENDED_PARTITION = 5,
18 LINUX_EXTENDED_PARTITION = 0x85,
19 WIN98_EXTENDED_PARTITION = 0x0f,
20
21 LINUX_SWAP_PARTITION = 0x82,
22 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
23
24 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
25 NEW_SOLARIS_X86_PARTITION = 0xbf,
26
27 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
28 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
29 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
30 EZD_PARTITION = 0x55, /* EZ-DRIVE */
31
32 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
33 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
34 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
35 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
36 MINIX_PARTITION = 0x81, /* Minix Partition ID */
37 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
38 };
39
40 #ifndef __KERNEL__
41
42 struct partition {
43 unsigned char boot_ind; /* 0x80 - active */
44 unsigned char head; /* starting head */
45 unsigned char sector; /* starting sector */
46 unsigned char cyl; /* starting cylinder */
47 unsigned char sys_ind; /* What partition type */
48 unsigned char end_head; /* end head */
49 unsigned char end_sector; /* end sector */
50 unsigned char end_cyl; /* end cylinder */
51 unsigned int start_sect; /* starting sector counting from 0 */
52 unsigned int nr_sects; /* nr of sectors in partition */
53 } __attribute__((packed));
54
55 #endif
56
57 #ifdef __KERNEL__
58 #include <linux/major.h>
59 #include <linux/device.h>
60 #include <linux/smp.h>
61 #include <linux/string.h>
62 #include <linux/fs.h>
63
64 struct partition {
65 unsigned char boot_ind; /* 0x80 - active */
66 unsigned char head; /* starting head */
67 unsigned char sector; /* starting sector */
68 unsigned char cyl; /* starting cylinder */
69 unsigned char sys_ind; /* What partition type */
70 unsigned char end_head; /* end head */
71 unsigned char end_sector; /* end sector */
72 unsigned char end_cyl; /* end cylinder */
73 __le32 start_sect; /* starting sector counting from 0 */
74 __le32 nr_sects; /* nr of sectors in partition */
75 } __attribute__((packed));
76
77 struct hd_struct {
78 sector_t start_sect;
79 sector_t nr_sects;
80 struct kobject kobj;
81 struct kobject *holder_dir;
82 unsigned ios[2], sectors[2]; /* READs and WRITEs */
83 int policy, partno;
84 };
85
86 #define GENHD_FL_REMOVABLE 1
87 #define GENHD_FL_DRIVERFS 2
88 #define GENHD_FL_CD 8
89 #define GENHD_FL_UP 16
90 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
91
92 struct disk_stats {
93 unsigned long sectors[2]; /* READs and WRITEs */
94 unsigned long ios[2];
95 unsigned long merges[2];
96 unsigned long ticks[2];
97 unsigned long io_ticks;
98 unsigned long time_in_queue;
99 };
100
101 struct gendisk {
102 int major; /* major number of driver */
103 int first_minor;
104 int minors; /* maximum number of minors, =1 for
105 * disks that can't be partitioned. */
106 char disk_name[32]; /* name of major driver */
107 struct hd_struct **part; /* [indexed by minor] */
108 int part_uevent_suppress;
109 struct block_device_operations *fops;
110 struct request_queue *queue;
111 void *private_data;
112 sector_t capacity;
113
114 int flags;
115 struct device *driverfs_dev;
116 struct kobject kobj;
117 struct kobject *holder_dir;
118 struct kobject *slave_dir;
119
120 struct timer_rand_state *random;
121 int policy;
122
123 atomic_t sync_io; /* RAID */
124 unsigned long stamp;
125 int in_flight;
126 #ifdef CONFIG_SMP
127 struct disk_stats *dkstats;
128 #else
129 struct disk_stats dkstats;
130 #endif
131 };
132
133 /* Structure for sysfs attributes on block devices */
134 struct disk_attribute {
135 struct attribute attr;
136 ssize_t (*show)(struct gendisk *, char *);
137 ssize_t (*store)(struct gendisk *, const char *, size_t);
138 };
139
140 /*
141 * Macros to operate on percpu disk statistics:
142 *
143 * The __ variants should only be called in critical sections. The full
144 * variants disable/enable preemption.
145 */
146 #ifdef CONFIG_SMP
147 #define __disk_stat_add(gendiskp, field, addnd) \
148 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
149
150 #define disk_stat_read(gendiskp, field) \
151 ({ \
152 typeof(gendiskp->dkstats->field) res = 0; \
153 int i; \
154 for_each_possible_cpu(i) \
155 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
156 res; \
157 })
158
disk_stat_set_all(struct gendisk * gendiskp,int value)159 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
160 int i;
161 for_each_possible_cpu(i)
162 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
163 sizeof (struct disk_stats));
164 }
165
166 #else
167 #define __disk_stat_add(gendiskp, field, addnd) \
168 (gendiskp->dkstats.field += addnd)
169 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
170
disk_stat_set_all(struct gendisk * gendiskp,int value)171 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
172 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
173 }
174 #endif
175
176 #define disk_stat_add(gendiskp, field, addnd) \
177 do { \
178 preempt_disable(); \
179 __disk_stat_add(gendiskp, field, addnd); \
180 preempt_enable(); \
181 } while (0)
182
183 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
184 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
185
186 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
187 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
188
189 #define __disk_stat_sub(gendiskp, field, subnd) \
190 __disk_stat_add(gendiskp, field, -subnd)
191 #define disk_stat_sub(gendiskp, field, subnd) \
192 disk_stat_add(gendiskp, field, -subnd)
193
194
195 /* Inlines to alloc and free disk stats in struct gendisk */
196 #ifdef CONFIG_SMP
init_disk_stats(struct gendisk * disk)197 static inline int init_disk_stats(struct gendisk *disk)
198 {
199 disk->dkstats = alloc_percpu(struct disk_stats);
200 if (!disk->dkstats)
201 return 0;
202 return 1;
203 }
204
free_disk_stats(struct gendisk * disk)205 static inline void free_disk_stats(struct gendisk *disk)
206 {
207 free_percpu(disk->dkstats);
208 }
209 #else /* CONFIG_SMP */
init_disk_stats(struct gendisk * disk)210 static inline int init_disk_stats(struct gendisk *disk)
211 {
212 return 1;
213 }
214
free_disk_stats(struct gendisk * disk)215 static inline void free_disk_stats(struct gendisk *disk)
216 {
217 }
218 #endif /* CONFIG_SMP */
219
220 /* drivers/block/ll_rw_blk.c */
221 extern void disk_round_stats(struct gendisk *disk);
222
223 /* drivers/block/genhd.c */
224 extern int get_blkdev_list(char *, int);
225 extern void add_disk(struct gendisk *disk);
226 extern void del_gendisk(struct gendisk *gp);
227 extern void unlink_gendisk(struct gendisk *gp);
228 extern struct gendisk *get_gendisk(dev_t dev, int *part);
229
230 extern void set_device_ro(struct block_device *bdev, int flag);
231 extern void set_disk_ro(struct gendisk *disk, int flag);
232
233 /* drivers/char/random.c */
234 extern void add_disk_randomness(struct gendisk *disk);
235 extern void rand_initialize_disk(struct gendisk *disk);
236
get_start_sect(struct block_device * bdev)237 static inline sector_t get_start_sect(struct block_device *bdev)
238 {
239 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
240 }
get_capacity(struct gendisk * disk)241 static inline sector_t get_capacity(struct gendisk *disk)
242 {
243 return disk->capacity;
244 }
set_capacity(struct gendisk * disk,sector_t size)245 static inline void set_capacity(struct gendisk *disk, sector_t size)
246 {
247 disk->capacity = size;
248 }
249
250 #endif /* __KERNEL__ */
251
252 #ifdef CONFIG_SOLARIS_X86_PARTITION
253
254 #define SOLARIS_X86_NUMSLICE 8
255 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
256
257 struct solaris_x86_slice {
258 __le16 s_tag; /* ID tag of partition */
259 __le16 s_flag; /* permission flags */
260 __le32 s_start; /* start sector no of partition */
261 __le32 s_size; /* # of blocks in partition */
262 };
263
264 struct solaris_x86_vtoc {
265 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
266 __le32 v_sanity; /* to verify vtoc sanity */
267 __le32 v_version; /* layout version */
268 char v_volume[8]; /* volume name */
269 __le16 v_sectorsz; /* sector size in bytes */
270 __le16 v_nparts; /* number of partitions */
271 unsigned int v_reserved[10]; /* free space */
272 struct solaris_x86_slice
273 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
274 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
275 char v_asciilabel[128]; /* for compatibility */
276 };
277
278 #endif /* CONFIG_SOLARIS_X86_PARTITION */
279
280 #ifdef CONFIG_BSD_DISKLABEL
281 /*
282 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
283 * updated by Marc Espie <Marc.Espie@openbsd.org>
284 */
285
286 /* check against BSD src/sys/sys/disklabel.h for consistency */
287
288 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
289 #define BSD_MAXPARTITIONS 16
290 #define OPENBSD_MAXPARTITIONS 16
291 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
292 struct bsd_disklabel {
293 __le32 d_magic; /* the magic number */
294 __s16 d_type; /* drive type */
295 __s16 d_subtype; /* controller/d_type specific */
296 char d_typename[16]; /* type name, e.g. "eagle" */
297 char d_packname[16]; /* pack identifier */
298 __u32 d_secsize; /* # of bytes per sector */
299 __u32 d_nsectors; /* # of data sectors per track */
300 __u32 d_ntracks; /* # of tracks per cylinder */
301 __u32 d_ncylinders; /* # of data cylinders per unit */
302 __u32 d_secpercyl; /* # of data sectors per cylinder */
303 __u32 d_secperunit; /* # of data sectors per unit */
304 __u16 d_sparespertrack; /* # of spare sectors per track */
305 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
306 __u32 d_acylinders; /* # of alt. cylinders per unit */
307 __u16 d_rpm; /* rotational speed */
308 __u16 d_interleave; /* hardware sector interleave */
309 __u16 d_trackskew; /* sector 0 skew, per track */
310 __u16 d_cylskew; /* sector 0 skew, per cylinder */
311 __u32 d_headswitch; /* head switch time, usec */
312 __u32 d_trkseek; /* track-to-track seek, usec */
313 __u32 d_flags; /* generic flags */
314 #define NDDATA 5
315 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
316 #define NSPARE 5
317 __u32 d_spare[NSPARE]; /* reserved for future use */
318 __le32 d_magic2; /* the magic number (again) */
319 __le16 d_checksum; /* xor of data incl. partitions */
320
321 /* filesystem and partition information: */
322 __le16 d_npartitions; /* number of partitions in following */
323 __le32 d_bbsize; /* size of boot area at sn0, bytes */
324 __le32 d_sbsize; /* max size of fs superblock, bytes */
325 struct bsd_partition { /* the partition table */
326 __le32 p_size; /* number of sectors in partition */
327 __le32 p_offset; /* starting sector */
328 __le32 p_fsize; /* filesystem basic fragment size */
329 __u8 p_fstype; /* filesystem type, see below */
330 __u8 p_frag; /* filesystem fragments per block */
331 __le16 p_cpg; /* filesystem cylinders per group */
332 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
333 };
334
335 #endif /* CONFIG_BSD_DISKLABEL */
336
337 #ifdef CONFIG_UNIXWARE_DISKLABEL
338 /*
339 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
340 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
341 */
342
343 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
344 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
345 #define UNIXWARE_NUMSLICE 16
346 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
347
348 struct unixware_slice {
349 __le16 s_label; /* label */
350 __le16 s_flags; /* permission flags */
351 __le32 start_sect; /* starting sector */
352 __le32 nr_sects; /* number of sectors in slice */
353 };
354
355 struct unixware_disklabel {
356 __le32 d_type; /* drive type */
357 __le32 d_magic; /* the magic number */
358 __le32 d_version; /* version number */
359 char d_serial[12]; /* serial number of the device */
360 __le32 d_ncylinders; /* # of data cylinders per device */
361 __le32 d_ntracks; /* # of tracks per cylinder */
362 __le32 d_nsectors; /* # of data sectors per track */
363 __le32 d_secsize; /* # of bytes per sector */
364 __le32 d_part_start; /* # of first sector of this partition */
365 __le32 d_unknown1[12]; /* ? */
366 __le32 d_alt_tbl; /* byte offset of alternate table */
367 __le32 d_alt_len; /* byte length of alternate table */
368 __le32 d_phys_cyl; /* # of physical cylinders per device */
369 __le32 d_phys_trk; /* # of physical tracks per cylinder */
370 __le32 d_phys_sec; /* # of physical sectors per track */
371 __le32 d_phys_bytes; /* # of physical bytes per sector */
372 __le32 d_unknown2; /* ? */
373 __le32 d_unknown3; /* ? */
374 __le32 d_pad[8]; /* pad */
375
376 struct unixware_vtoc {
377 __le32 v_magic; /* the magic number */
378 __le32 v_version; /* version number */
379 char v_name[8]; /* volume name */
380 __le16 v_nslices; /* # of slices */
381 __le16 v_unknown1; /* ? */
382 __le32 v_reserved[10]; /* reserved */
383 struct unixware_slice
384 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
385 } vtoc;
386
387 }; /* 408 */
388
389 #endif /* CONFIG_UNIXWARE_DISKLABEL */
390
391 #ifdef CONFIG_MINIX_SUBPARTITION
392 # define MINIX_NR_SUBPARTITIONS 4
393 #endif /* CONFIG_MINIX_SUBPARTITION */
394
395 #ifdef __KERNEL__
396
397 char *disk_name (struct gendisk *hd, int part, char *buf);
398
399 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
400 extern void add_partition(struct gendisk *, int, sector_t, sector_t);
401 extern void delete_partition(struct gendisk *, int);
402
403 extern struct gendisk *alloc_disk_node(int minors, int node_id);
404 extern struct gendisk *alloc_disk(int minors);
405 extern struct kobject *get_disk(struct gendisk *disk);
406 extern void put_disk(struct gendisk *disk);
407
408 extern void blk_register_region(dev_t dev, unsigned long range,
409 struct module *module,
410 struct kobject *(*probe)(dev_t, int *, void *),
411 int (*lock)(dev_t, void *),
412 void *data);
413 extern void blk_unregister_region(dev_t dev, unsigned long range);
414
bdget_disk(struct gendisk * disk,int index)415 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
416 {
417 return bdget(MKDEV(disk->major, disk->first_minor) + index);
418 }
419
420 #endif
421
422 #endif
423