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1da177e4 LT |
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 | ||
1da177e4 | 12 | #include <linux/types.h> |
1da177e4 | 13 | |
9361401e DH |
14 | #ifdef CONFIG_BLOCK |
15 | ||
1da177e4 LT |
16 | enum { |
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, | |
22 | ||
d18d7682 FMDN |
23 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
24 | ||
1da177e4 | 25 | LINUX_SWAP_PARTITION = 0x82, |
4419d1ac OH |
26 | LINUX_DATA_PARTITION = 0x83, |
27 | LINUX_LVM_PARTITION = 0x8e, | |
1da177e4 LT |
28 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
29 | ||
30 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, | |
31 | NEW_SOLARIS_X86_PARTITION = 0xbf, | |
32 | ||
33 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ | |
34 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ | |
35 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ | |
36 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ | |
37 | ||
38 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ | |
39 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ | |
40 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ | |
41 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ | |
42 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ | |
43 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ | |
44 | }; | |
45 | ||
46 | #ifndef __KERNEL__ | |
47 | ||
48 | struct partition { | |
49 | unsigned char boot_ind; /* 0x80 - active */ | |
50 | unsigned char head; /* starting head */ | |
51 | unsigned char sector; /* starting sector */ | |
52 | unsigned char cyl; /* starting cylinder */ | |
53 | unsigned char sys_ind; /* What partition type */ | |
54 | unsigned char end_head; /* end head */ | |
55 | unsigned char end_sector; /* end sector */ | |
56 | unsigned char end_cyl; /* end cylinder */ | |
57 | unsigned int start_sect; /* starting sector counting from 0 */ | |
58 | unsigned int nr_sects; /* nr of sectors in partition */ | |
59 | } __attribute__((packed)); | |
60 | ||
61 | #endif | |
62 | ||
63 | #ifdef __KERNEL__ | |
34186efc DW |
64 | #include <linux/major.h> |
65 | #include <linux/device.h> | |
66 | #include <linux/smp.h> | |
67 | #include <linux/string.h> | |
68 | #include <linux/fs.h> | |
69 | ||
1da177e4 LT |
70 | struct partition { |
71 | unsigned char boot_ind; /* 0x80 - active */ | |
72 | unsigned char head; /* starting head */ | |
73 | unsigned char sector; /* starting sector */ | |
74 | unsigned char cyl; /* starting cylinder */ | |
75 | unsigned char sys_ind; /* What partition type */ | |
76 | unsigned char end_head; /* end head */ | |
77 | unsigned char end_sector; /* end sector */ | |
78 | unsigned char end_cyl; /* end cylinder */ | |
79 | __le32 start_sect; /* starting sector counting from 0 */ | |
80 | __le32 nr_sects; /* nr of sectors in partition */ | |
81 | } __attribute__((packed)); | |
82 | ||
83 | struct hd_struct { | |
84 | sector_t start_sect; | |
85 | sector_t nr_sects; | |
86 | struct kobject kobj; | |
6a4d44c1 | 87 | struct kobject *holder_dir; |
47a00410 | 88 | unsigned ios[2], sectors[2]; /* READs and WRITEs */ |
1da177e4 | 89 | int policy, partno; |
c17bb495 AM |
90 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
91 | int make_it_fail; | |
92 | #endif | |
1da177e4 LT |
93 | }; |
94 | ||
95 | #define GENHD_FL_REMOVABLE 1 | |
96 | #define GENHD_FL_DRIVERFS 2 | |
86ce18d7 | 97 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
1da177e4 LT |
98 | #define GENHD_FL_CD 8 |
99 | #define GENHD_FL_UP 16 | |
100 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
c17bb495 | 101 | #define GENHD_FL_FAIL 64 |
1da177e4 LT |
102 | |
103 | struct disk_stats { | |
837c7878 BW |
104 | unsigned long sectors[2]; /* READs and WRITEs */ |
105 | unsigned long ios[2]; | |
106 | unsigned long merges[2]; | |
107 | unsigned long ticks[2]; | |
108 | unsigned long io_ticks; | |
109 | unsigned long time_in_queue; | |
1da177e4 LT |
110 | }; |
111 | ||
112 | struct gendisk { | |
113 | int major; /* major number of driver */ | |
114 | int first_minor; | |
115 | int minors; /* maximum number of minors, =1 for | |
116 | * disks that can't be partitioned. */ | |
117 | char disk_name[32]; /* name of major driver */ | |
118 | struct hd_struct **part; /* [indexed by minor] */ | |
d4d7e5df | 119 | int part_uevent_suppress; |
1da177e4 LT |
120 | struct block_device_operations *fops; |
121 | struct request_queue *queue; | |
122 | void *private_data; | |
123 | sector_t capacity; | |
124 | ||
125 | int flags; | |
1da177e4 LT |
126 | struct device *driverfs_dev; |
127 | struct kobject kobj; | |
6a4d44c1 JN |
128 | struct kobject *holder_dir; |
129 | struct kobject *slave_dir; | |
1da177e4 LT |
130 | |
131 | struct timer_rand_state *random; | |
132 | int policy; | |
133 | ||
134 | atomic_t sync_io; /* RAID */ | |
20e5c81f | 135 | unsigned long stamp; |
1da177e4 LT |
136 | int in_flight; |
137 | #ifdef CONFIG_SMP | |
138 | struct disk_stats *dkstats; | |
139 | #else | |
140 | struct disk_stats dkstats; | |
141 | #endif | |
142 | }; | |
143 | ||
144 | /* Structure for sysfs attributes on block devices */ | |
145 | struct disk_attribute { | |
146 | struct attribute attr; | |
147 | ssize_t (*show)(struct gendisk *, char *); | |
a7fd6706 | 148 | ssize_t (*store)(struct gendisk *, const char *, size_t); |
1da177e4 LT |
149 | }; |
150 | ||
151 | /* | |
152 | * Macros to operate on percpu disk statistics: | |
153 | * | |
154 | * The __ variants should only be called in critical sections. The full | |
155 | * variants disable/enable preemption. | |
156 | */ | |
157 | #ifdef CONFIG_SMP | |
158 | #define __disk_stat_add(gendiskp, field, addnd) \ | |
159 | (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) | |
160 | ||
161 | #define disk_stat_read(gendiskp, field) \ | |
162 | ({ \ | |
163 | typeof(gendiskp->dkstats->field) res = 0; \ | |
164 | int i; \ | |
0a945022 | 165 | for_each_possible_cpu(i) \ |
1da177e4 | 166 | res += per_cpu_ptr(gendiskp->dkstats, i)->field; \ |
1da177e4 LT |
167 | res; \ |
168 | }) | |
169 | ||
170 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { | |
171 | int i; | |
0a945022 | 172 | for_each_possible_cpu(i) |
394e3902 AM |
173 | memset(per_cpu_ptr(gendiskp->dkstats, i), value, |
174 | sizeof (struct disk_stats)); | |
1da177e4 LT |
175 | } |
176 | ||
177 | #else | |
178 | #define __disk_stat_add(gendiskp, field, addnd) \ | |
179 | (gendiskp->dkstats.field += addnd) | |
180 | #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) | |
181 | ||
182 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { | |
183 | memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); | |
184 | } | |
185 | #endif | |
186 | ||
187 | #define disk_stat_add(gendiskp, field, addnd) \ | |
188 | do { \ | |
189 | preempt_disable(); \ | |
190 | __disk_stat_add(gendiskp, field, addnd); \ | |
191 | preempt_enable(); \ | |
192 | } while (0) | |
193 | ||
194 | #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1) | |
195 | #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) | |
196 | ||
197 | #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1) | |
198 | #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1) | |
199 | ||
200 | #define __disk_stat_sub(gendiskp, field, subnd) \ | |
201 | __disk_stat_add(gendiskp, field, -subnd) | |
202 | #define disk_stat_sub(gendiskp, field, subnd) \ | |
203 | disk_stat_add(gendiskp, field, -subnd) | |
204 | ||
205 | ||
206 | /* Inlines to alloc and free disk stats in struct gendisk */ | |
207 | #ifdef CONFIG_SMP | |
208 | static inline int init_disk_stats(struct gendisk *disk) | |
209 | { | |
210 | disk->dkstats = alloc_percpu(struct disk_stats); | |
211 | if (!disk->dkstats) | |
212 | return 0; | |
213 | return 1; | |
214 | } | |
215 | ||
216 | static inline void free_disk_stats(struct gendisk *disk) | |
217 | { | |
218 | free_percpu(disk->dkstats); | |
219 | } | |
220 | #else /* CONFIG_SMP */ | |
221 | static inline int init_disk_stats(struct gendisk *disk) | |
222 | { | |
223 | return 1; | |
224 | } | |
225 | ||
226 | static inline void free_disk_stats(struct gendisk *disk) | |
227 | { | |
228 | } | |
229 | #endif /* CONFIG_SMP */ | |
230 | ||
231 | /* drivers/block/ll_rw_blk.c */ | |
232 | extern void disk_round_stats(struct gendisk *disk); | |
233 | ||
234 | /* drivers/block/genhd.c */ | |
ac20427e | 235 | extern int get_blkdev_list(char *, int); |
1da177e4 LT |
236 | extern void add_disk(struct gendisk *disk); |
237 | extern void del_gendisk(struct gendisk *gp); | |
238 | extern void unlink_gendisk(struct gendisk *gp); | |
239 | extern struct gendisk *get_gendisk(dev_t dev, int *part); | |
240 | ||
241 | extern void set_device_ro(struct block_device *bdev, int flag); | |
242 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
243 | ||
244 | /* drivers/char/random.c */ | |
245 | extern void add_disk_randomness(struct gendisk *disk); | |
246 | extern void rand_initialize_disk(struct gendisk *disk); | |
247 | ||
248 | static inline sector_t get_start_sect(struct block_device *bdev) | |
249 | { | |
250 | return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect; | |
251 | } | |
252 | static inline sector_t get_capacity(struct gendisk *disk) | |
253 | { | |
254 | return disk->capacity; | |
255 | } | |
256 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
257 | { | |
258 | disk->capacity = size; | |
259 | } | |
260 | ||
261 | #endif /* __KERNEL__ */ | |
262 | ||
263 | #ifdef CONFIG_SOLARIS_X86_PARTITION | |
264 | ||
265 | #define SOLARIS_X86_NUMSLICE 8 | |
266 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) | |
267 | ||
268 | struct solaris_x86_slice { | |
269 | __le16 s_tag; /* ID tag of partition */ | |
270 | __le16 s_flag; /* permission flags */ | |
271 | __le32 s_start; /* start sector no of partition */ | |
272 | __le32 s_size; /* # of blocks in partition */ | |
273 | }; | |
274 | ||
275 | struct solaris_x86_vtoc { | |
276 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
277 | __le32 v_sanity; /* to verify vtoc sanity */ | |
278 | __le32 v_version; /* layout version */ | |
279 | char v_volume[8]; /* volume name */ | |
280 | __le16 v_sectorsz; /* sector size in bytes */ | |
281 | __le16 v_nparts; /* number of partitions */ | |
282 | unsigned int v_reserved[10]; /* free space */ | |
283 | struct solaris_x86_slice | |
284 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
285 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
286 | char v_asciilabel[128]; /* for compatibility */ | |
287 | }; | |
288 | ||
289 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
290 | ||
291 | #ifdef CONFIG_BSD_DISKLABEL | |
292 | /* | |
293 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
294 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
295 | */ | |
296 | ||
297 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
298 | ||
299 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
300 | #define BSD_MAXPARTITIONS 16 | |
301 | #define OPENBSD_MAXPARTITIONS 16 | |
302 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
303 | struct bsd_disklabel { | |
304 | __le32 d_magic; /* the magic number */ | |
305 | __s16 d_type; /* drive type */ | |
306 | __s16 d_subtype; /* controller/d_type specific */ | |
307 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
308 | char d_packname[16]; /* pack identifier */ | |
309 | __u32 d_secsize; /* # of bytes per sector */ | |
310 | __u32 d_nsectors; /* # of data sectors per track */ | |
311 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
312 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
313 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
314 | __u32 d_secperunit; /* # of data sectors per unit */ | |
315 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
316 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
317 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
318 | __u16 d_rpm; /* rotational speed */ | |
319 | __u16 d_interleave; /* hardware sector interleave */ | |
320 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
321 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
322 | __u32 d_headswitch; /* head switch time, usec */ | |
323 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
324 | __u32 d_flags; /* generic flags */ | |
325 | #define NDDATA 5 | |
326 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
327 | #define NSPARE 5 | |
328 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
329 | __le32 d_magic2; /* the magic number (again) */ | |
330 | __le16 d_checksum; /* xor of data incl. partitions */ | |
331 | ||
332 | /* filesystem and partition information: */ | |
333 | __le16 d_npartitions; /* number of partitions in following */ | |
334 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
335 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
336 | struct bsd_partition { /* the partition table */ | |
337 | __le32 p_size; /* number of sectors in partition */ | |
338 | __le32 p_offset; /* starting sector */ | |
339 | __le32 p_fsize; /* filesystem basic fragment size */ | |
340 | __u8 p_fstype; /* filesystem type, see below */ | |
341 | __u8 p_frag; /* filesystem fragments per block */ | |
342 | __le16 p_cpg; /* filesystem cylinders per group */ | |
343 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
344 | }; | |
345 | ||
346 | #endif /* CONFIG_BSD_DISKLABEL */ | |
347 | ||
348 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
349 | /* | |
350 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
351 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
352 | */ | |
353 | ||
354 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
355 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
356 | #define UNIXWARE_NUMSLICE 16 | |
357 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
358 | ||
359 | struct unixware_slice { | |
360 | __le16 s_label; /* label */ | |
361 | __le16 s_flags; /* permission flags */ | |
362 | __le32 start_sect; /* starting sector */ | |
363 | __le32 nr_sects; /* number of sectors in slice */ | |
364 | }; | |
365 | ||
366 | struct unixware_disklabel { | |
367 | __le32 d_type; /* drive type */ | |
368 | __le32 d_magic; /* the magic number */ | |
369 | __le32 d_version; /* version number */ | |
370 | char d_serial[12]; /* serial number of the device */ | |
371 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
372 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
373 | __le32 d_nsectors; /* # of data sectors per track */ | |
374 | __le32 d_secsize; /* # of bytes per sector */ | |
375 | __le32 d_part_start; /* # of first sector of this partition */ | |
376 | __le32 d_unknown1[12]; /* ? */ | |
377 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
378 | __le32 d_alt_len; /* byte length of alternate table */ | |
379 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
380 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
381 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
382 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
383 | __le32 d_unknown2; /* ? */ | |
384 | __le32 d_unknown3; /* ? */ | |
385 | __le32 d_pad[8]; /* pad */ | |
386 | ||
387 | struct unixware_vtoc { | |
388 | __le32 v_magic; /* the magic number */ | |
389 | __le32 v_version; /* version number */ | |
390 | char v_name[8]; /* volume name */ | |
391 | __le16 v_nslices; /* # of slices */ | |
392 | __le16 v_unknown1; /* ? */ | |
393 | __le32 v_reserved[10]; /* reserved */ | |
394 | struct unixware_slice | |
395 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
396 | } vtoc; | |
397 | ||
398 | }; /* 408 */ | |
399 | ||
400 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
401 | ||
402 | #ifdef CONFIG_MINIX_SUBPARTITION | |
403 | # define MINIX_NR_SUBPARTITIONS 4 | |
404 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
405 | ||
406 | #ifdef __KERNEL__ | |
407 | ||
d18d7682 FMDN |
408 | #define ADDPART_FLAG_NONE 0 |
409 | #define ADDPART_FLAG_RAID 1 | |
410 | #define ADDPART_FLAG_WHOLEDISK 2 | |
411 | ||
1da177e4 LT |
412 | char *disk_name (struct gendisk *hd, int part, char *buf); |
413 | ||
414 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); | |
d18d7682 | 415 | extern void add_partition(struct gendisk *, int, sector_t, sector_t, int); |
1da177e4 | 416 | extern void delete_partition(struct gendisk *, int); |
dd2a345f | 417 | extern void printk_all_partitions(void); |
1da177e4 | 418 | |
1946089a | 419 | extern struct gendisk *alloc_disk_node(int minors, int node_id); |
1da177e4 LT |
420 | extern struct gendisk *alloc_disk(int minors); |
421 | extern struct kobject *get_disk(struct gendisk *disk); | |
422 | extern void put_disk(struct gendisk *disk); | |
423 | ||
424 | extern void blk_register_region(dev_t dev, unsigned long range, | |
425 | struct module *module, | |
426 | struct kobject *(*probe)(dev_t, int *, void *), | |
427 | int (*lock)(dev_t, void *), | |
428 | void *data); | |
429 | extern void blk_unregister_region(dev_t dev, unsigned long range); | |
430 | ||
431 | static inline struct block_device *bdget_disk(struct gendisk *disk, int index) | |
432 | { | |
433 | return bdget(MKDEV(disk->major, disk->first_minor) + index); | |
434 | } | |
435 | ||
436 | #endif | |
437 | ||
87c1efbf JA |
438 | #else /* CONFIG_BLOCK */ |
439 | ||
440 | static inline void printk_all_partitions(void) { } | |
441 | ||
442 | #endif /* CONFIG_BLOCK */ | |
9361401e DH |
443 | |
444 | #endif |