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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> |
edfaa7c3 | 13 | #include <linux/kdev_t.h> |
1da177e4 | 14 | |
9361401e DH |
15 | #ifdef CONFIG_BLOCK |
16 | ||
edfaa7c3 KS |
17 | #define kobj_to_dev(k) container_of(k, struct device, kobj) |
18 | #define dev_to_disk(device) container_of(device, struct gendisk, dev) | |
19 | #define dev_to_part(device) container_of(device, struct hd_struct, dev) | |
20 | ||
21 | extern struct device_type disk_type; | |
22 | extern struct device_type part_type; | |
23 | extern struct kobject *block_depr; | |
24 | extern struct class block_class; | |
25 | ||
1da177e4 LT |
26 | enum { |
27 | /* These three have identical behaviour; use the second one if DOS FDISK gets | |
28 | confused about extended/logical partitions starting past cylinder 1023. */ | |
29 | DOS_EXTENDED_PARTITION = 5, | |
30 | LINUX_EXTENDED_PARTITION = 0x85, | |
31 | WIN98_EXTENDED_PARTITION = 0x0f, | |
32 | ||
d18d7682 FMDN |
33 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
34 | ||
1da177e4 | 35 | LINUX_SWAP_PARTITION = 0x82, |
4419d1ac OH |
36 | LINUX_DATA_PARTITION = 0x83, |
37 | LINUX_LVM_PARTITION = 0x8e, | |
1da177e4 LT |
38 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
39 | ||
40 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, | |
41 | NEW_SOLARIS_X86_PARTITION = 0xbf, | |
42 | ||
43 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ | |
44 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ | |
45 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ | |
46 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ | |
47 | ||
48 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ | |
49 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ | |
50 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ | |
51 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ | |
52 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ | |
53 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ | |
54 | }; | |
55 | ||
56 | #ifndef __KERNEL__ | |
57 | ||
58 | struct partition { | |
59 | unsigned char boot_ind; /* 0x80 - active */ | |
60 | unsigned char head; /* starting head */ | |
61 | unsigned char sector; /* starting sector */ | |
62 | unsigned char cyl; /* starting cylinder */ | |
63 | unsigned char sys_ind; /* What partition type */ | |
64 | unsigned char end_head; /* end head */ | |
65 | unsigned char end_sector; /* end sector */ | |
66 | unsigned char end_cyl; /* end cylinder */ | |
67 | unsigned int start_sect; /* starting sector counting from 0 */ | |
68 | unsigned int nr_sects; /* nr of sectors in partition */ | |
69 | } __attribute__((packed)); | |
70 | ||
71 | #endif | |
72 | ||
73 | #ifdef __KERNEL__ | |
34186efc DW |
74 | #include <linux/major.h> |
75 | #include <linux/device.h> | |
76 | #include <linux/smp.h> | |
77 | #include <linux/string.h> | |
78 | #include <linux/fs.h> | |
8ce7ad7b | 79 | #include <linux/workqueue.h> |
34186efc | 80 | |
1da177e4 LT |
81 | struct partition { |
82 | unsigned char boot_ind; /* 0x80 - active */ | |
83 | unsigned char head; /* starting head */ | |
84 | unsigned char sector; /* starting sector */ | |
85 | unsigned char cyl; /* starting cylinder */ | |
86 | unsigned char sys_ind; /* What partition type */ | |
87 | unsigned char end_head; /* end head */ | |
88 | unsigned char end_sector; /* end sector */ | |
89 | unsigned char end_cyl; /* end cylinder */ | |
90 | __le32 start_sect; /* starting sector counting from 0 */ | |
91 | __le32 nr_sects; /* nr of sectors in partition */ | |
92 | } __attribute__((packed)); | |
93 | ||
94 | struct hd_struct { | |
95 | sector_t start_sect; | |
96 | sector_t nr_sects; | |
edfaa7c3 | 97 | struct device dev; |
6a4d44c1 | 98 | struct kobject *holder_dir; |
47a00410 | 99 | unsigned ios[2], sectors[2]; /* READs and WRITEs */ |
1da177e4 | 100 | int policy, partno; |
c17bb495 AM |
101 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
102 | int make_it_fail; | |
103 | #endif | |
1da177e4 LT |
104 | }; |
105 | ||
106 | #define GENHD_FL_REMOVABLE 1 | |
107 | #define GENHD_FL_DRIVERFS 2 | |
86ce18d7 | 108 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
1da177e4 LT |
109 | #define GENHD_FL_CD 8 |
110 | #define GENHD_FL_UP 16 | |
111 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
c17bb495 | 112 | #define GENHD_FL_FAIL 64 |
1da177e4 LT |
113 | |
114 | struct disk_stats { | |
837c7878 BW |
115 | unsigned long sectors[2]; /* READs and WRITEs */ |
116 | unsigned long ios[2]; | |
117 | unsigned long merges[2]; | |
118 | unsigned long ticks[2]; | |
119 | unsigned long io_ticks; | |
120 | unsigned long time_in_queue; | |
1da177e4 LT |
121 | }; |
122 | ||
123 | struct gendisk { | |
124 | int major; /* major number of driver */ | |
125 | int first_minor; | |
126 | int minors; /* maximum number of minors, =1 for | |
127 | * disks that can't be partitioned. */ | |
128 | char disk_name[32]; /* name of major driver */ | |
129 | struct hd_struct **part; /* [indexed by minor] */ | |
130 | struct block_device_operations *fops; | |
131 | struct request_queue *queue; | |
132 | void *private_data; | |
133 | sector_t capacity; | |
134 | ||
135 | int flags; | |
edfaa7c3 KS |
136 | struct device *driverfs_dev; // FIXME: remove |
137 | struct device dev; | |
6a4d44c1 JN |
138 | struct kobject *holder_dir; |
139 | struct kobject *slave_dir; | |
1da177e4 LT |
140 | |
141 | struct timer_rand_state *random; | |
142 | int policy; | |
143 | ||
144 | atomic_t sync_io; /* RAID */ | |
20e5c81f | 145 | unsigned long stamp; |
1da177e4 LT |
146 | int in_flight; |
147 | #ifdef CONFIG_SMP | |
148 | struct disk_stats *dkstats; | |
149 | #else | |
150 | struct disk_stats dkstats; | |
151 | #endif | |
8ce7ad7b | 152 | struct work_struct async_notify; |
1da177e4 LT |
153 | }; |
154 | ||
1da177e4 LT |
155 | /* |
156 | * Macros to operate on percpu disk statistics: | |
157 | * | |
158 | * The __ variants should only be called in critical sections. The full | |
159 | * variants disable/enable preemption. | |
160 | */ | |
161 | #ifdef CONFIG_SMP | |
162 | #define __disk_stat_add(gendiskp, field, addnd) \ | |
163 | (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) | |
164 | ||
165 | #define disk_stat_read(gendiskp, field) \ | |
166 | ({ \ | |
167 | typeof(gendiskp->dkstats->field) res = 0; \ | |
168 | int i; \ | |
0a945022 | 169 | for_each_possible_cpu(i) \ |
1da177e4 | 170 | res += per_cpu_ptr(gendiskp->dkstats, i)->field; \ |
1da177e4 LT |
171 | res; \ |
172 | }) | |
173 | ||
174 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { | |
175 | int i; | |
0a945022 | 176 | for_each_possible_cpu(i) |
394e3902 AM |
177 | memset(per_cpu_ptr(gendiskp->dkstats, i), value, |
178 | sizeof (struct disk_stats)); | |
1da177e4 LT |
179 | } |
180 | ||
181 | #else | |
182 | #define __disk_stat_add(gendiskp, field, addnd) \ | |
183 | (gendiskp->dkstats.field += addnd) | |
184 | #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) | |
185 | ||
186 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { | |
187 | memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); | |
188 | } | |
189 | #endif | |
190 | ||
191 | #define disk_stat_add(gendiskp, field, addnd) \ | |
192 | do { \ | |
193 | preempt_disable(); \ | |
194 | __disk_stat_add(gendiskp, field, addnd); \ | |
195 | preempt_enable(); \ | |
196 | } while (0) | |
197 | ||
198 | #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1) | |
199 | #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) | |
200 | ||
201 | #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1) | |
202 | #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1) | |
203 | ||
204 | #define __disk_stat_sub(gendiskp, field, subnd) \ | |
205 | __disk_stat_add(gendiskp, field, -subnd) | |
206 | #define disk_stat_sub(gendiskp, field, subnd) \ | |
207 | disk_stat_add(gendiskp, field, -subnd) | |
208 | ||
209 | ||
210 | /* Inlines to alloc and free disk stats in struct gendisk */ | |
211 | #ifdef CONFIG_SMP | |
212 | static inline int init_disk_stats(struct gendisk *disk) | |
213 | { | |
214 | disk->dkstats = alloc_percpu(struct disk_stats); | |
215 | if (!disk->dkstats) | |
216 | return 0; | |
217 | return 1; | |
218 | } | |
219 | ||
220 | static inline void free_disk_stats(struct gendisk *disk) | |
221 | { | |
222 | free_percpu(disk->dkstats); | |
223 | } | |
224 | #else /* CONFIG_SMP */ | |
225 | static inline int init_disk_stats(struct gendisk *disk) | |
226 | { | |
227 | return 1; | |
228 | } | |
229 | ||
230 | static inline void free_disk_stats(struct gendisk *disk) | |
231 | { | |
232 | } | |
233 | #endif /* CONFIG_SMP */ | |
234 | ||
235 | /* drivers/block/ll_rw_blk.c */ | |
236 | extern void disk_round_stats(struct gendisk *disk); | |
237 | ||
238 | /* drivers/block/genhd.c */ | |
ac20427e | 239 | extern int get_blkdev_list(char *, int); |
1da177e4 LT |
240 | extern void add_disk(struct gendisk *disk); |
241 | extern void del_gendisk(struct gendisk *gp); | |
242 | extern void unlink_gendisk(struct gendisk *gp); | |
243 | extern struct gendisk *get_gendisk(dev_t dev, int *part); | |
244 | ||
245 | extern void set_device_ro(struct block_device *bdev, int flag); | |
246 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
247 | ||
248 | /* drivers/char/random.c */ | |
249 | extern void add_disk_randomness(struct gendisk *disk); | |
250 | extern void rand_initialize_disk(struct gendisk *disk); | |
251 | ||
252 | static inline sector_t get_start_sect(struct block_device *bdev) | |
253 | { | |
254 | return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect; | |
255 | } | |
256 | static inline sector_t get_capacity(struct gendisk *disk) | |
257 | { | |
258 | return disk->capacity; | |
259 | } | |
260 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
261 | { | |
262 | disk->capacity = size; | |
263 | } | |
264 | ||
265 | #endif /* __KERNEL__ */ | |
266 | ||
267 | #ifdef CONFIG_SOLARIS_X86_PARTITION | |
268 | ||
b84d8796 | 269 | #define SOLARIS_X86_NUMSLICE 16 |
1da177e4 LT |
270 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
271 | ||
272 | struct solaris_x86_slice { | |
273 | __le16 s_tag; /* ID tag of partition */ | |
274 | __le16 s_flag; /* permission flags */ | |
275 | __le32 s_start; /* start sector no of partition */ | |
276 | __le32 s_size; /* # of blocks in partition */ | |
277 | }; | |
278 | ||
279 | struct solaris_x86_vtoc { | |
280 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
281 | __le32 v_sanity; /* to verify vtoc sanity */ | |
282 | __le32 v_version; /* layout version */ | |
283 | char v_volume[8]; /* volume name */ | |
284 | __le16 v_sectorsz; /* sector size in bytes */ | |
285 | __le16 v_nparts; /* number of partitions */ | |
286 | unsigned int v_reserved[10]; /* free space */ | |
287 | struct solaris_x86_slice | |
288 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
289 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
290 | char v_asciilabel[128]; /* for compatibility */ | |
291 | }; | |
292 | ||
293 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
294 | ||
295 | #ifdef CONFIG_BSD_DISKLABEL | |
296 | /* | |
297 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
298 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
299 | */ | |
300 | ||
301 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
302 | ||
303 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
304 | #define BSD_MAXPARTITIONS 16 | |
305 | #define OPENBSD_MAXPARTITIONS 16 | |
306 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
307 | struct bsd_disklabel { | |
308 | __le32 d_magic; /* the magic number */ | |
309 | __s16 d_type; /* drive type */ | |
310 | __s16 d_subtype; /* controller/d_type specific */ | |
311 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
312 | char d_packname[16]; /* pack identifier */ | |
313 | __u32 d_secsize; /* # of bytes per sector */ | |
314 | __u32 d_nsectors; /* # of data sectors per track */ | |
315 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
316 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
317 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
318 | __u32 d_secperunit; /* # of data sectors per unit */ | |
319 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
320 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
321 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
322 | __u16 d_rpm; /* rotational speed */ | |
323 | __u16 d_interleave; /* hardware sector interleave */ | |
324 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
325 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
326 | __u32 d_headswitch; /* head switch time, usec */ | |
327 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
328 | __u32 d_flags; /* generic flags */ | |
329 | #define NDDATA 5 | |
330 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
331 | #define NSPARE 5 | |
332 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
333 | __le32 d_magic2; /* the magic number (again) */ | |
334 | __le16 d_checksum; /* xor of data incl. partitions */ | |
335 | ||
336 | /* filesystem and partition information: */ | |
337 | __le16 d_npartitions; /* number of partitions in following */ | |
338 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
339 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
340 | struct bsd_partition { /* the partition table */ | |
341 | __le32 p_size; /* number of sectors in partition */ | |
342 | __le32 p_offset; /* starting sector */ | |
343 | __le32 p_fsize; /* filesystem basic fragment size */ | |
344 | __u8 p_fstype; /* filesystem type, see below */ | |
345 | __u8 p_frag; /* filesystem fragments per block */ | |
346 | __le16 p_cpg; /* filesystem cylinders per group */ | |
347 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
348 | }; | |
349 | ||
350 | #endif /* CONFIG_BSD_DISKLABEL */ | |
351 | ||
352 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
353 | /* | |
354 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
355 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
356 | */ | |
357 | ||
358 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
359 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
360 | #define UNIXWARE_NUMSLICE 16 | |
361 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
362 | ||
363 | struct unixware_slice { | |
364 | __le16 s_label; /* label */ | |
365 | __le16 s_flags; /* permission flags */ | |
366 | __le32 start_sect; /* starting sector */ | |
367 | __le32 nr_sects; /* number of sectors in slice */ | |
368 | }; | |
369 | ||
370 | struct unixware_disklabel { | |
371 | __le32 d_type; /* drive type */ | |
372 | __le32 d_magic; /* the magic number */ | |
373 | __le32 d_version; /* version number */ | |
374 | char d_serial[12]; /* serial number of the device */ | |
375 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
376 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
377 | __le32 d_nsectors; /* # of data sectors per track */ | |
378 | __le32 d_secsize; /* # of bytes per sector */ | |
379 | __le32 d_part_start; /* # of first sector of this partition */ | |
380 | __le32 d_unknown1[12]; /* ? */ | |
381 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
382 | __le32 d_alt_len; /* byte length of alternate table */ | |
383 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
384 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
385 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
386 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
387 | __le32 d_unknown2; /* ? */ | |
388 | __le32 d_unknown3; /* ? */ | |
389 | __le32 d_pad[8]; /* pad */ | |
390 | ||
391 | struct unixware_vtoc { | |
392 | __le32 v_magic; /* the magic number */ | |
393 | __le32 v_version; /* version number */ | |
394 | char v_name[8]; /* volume name */ | |
395 | __le16 v_nslices; /* # of slices */ | |
396 | __le16 v_unknown1; /* ? */ | |
397 | __le32 v_reserved[10]; /* reserved */ | |
398 | struct unixware_slice | |
399 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
400 | } vtoc; | |
401 | ||
402 | }; /* 408 */ | |
403 | ||
404 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
405 | ||
406 | #ifdef CONFIG_MINIX_SUBPARTITION | |
407 | # define MINIX_NR_SUBPARTITIONS 4 | |
408 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
409 | ||
410 | #ifdef __KERNEL__ | |
411 | ||
d18d7682 FMDN |
412 | #define ADDPART_FLAG_NONE 0 |
413 | #define ADDPART_FLAG_RAID 1 | |
414 | #define ADDPART_FLAG_WHOLEDISK 2 | |
415 | ||
edfaa7c3 KS |
416 | extern dev_t blk_lookup_devt(const char *name); |
417 | extern char *disk_name (struct gendisk *hd, int part, char *buf); | |
1da177e4 LT |
418 | |
419 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); | |
d18d7682 | 420 | extern void add_partition(struct gendisk *, int, sector_t, sector_t, int); |
1da177e4 | 421 | extern void delete_partition(struct gendisk *, int); |
dd2a345f | 422 | extern void printk_all_partitions(void); |
1da177e4 | 423 | |
1946089a | 424 | extern struct gendisk *alloc_disk_node(int minors, int node_id); |
1da177e4 LT |
425 | extern struct gendisk *alloc_disk(int minors); |
426 | extern struct kobject *get_disk(struct gendisk *disk); | |
427 | extern void put_disk(struct gendisk *disk); | |
8ce7ad7b | 428 | extern void genhd_media_change_notify(struct gendisk *disk); |
edfaa7c3 | 429 | extern void blk_register_region(dev_t devt, unsigned long range, |
1da177e4 LT |
430 | struct module *module, |
431 | struct kobject *(*probe)(dev_t, int *, void *), | |
432 | int (*lock)(dev_t, void *), | |
433 | void *data); | |
edfaa7c3 | 434 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
1da177e4 LT |
435 | |
436 | static inline struct block_device *bdget_disk(struct gendisk *disk, int index) | |
437 | { | |
438 | return bdget(MKDEV(disk->major, disk->first_minor) + index); | |
439 | } | |
440 | ||
441 | #endif | |
442 | ||
87c1efbf JA |
443 | #else /* CONFIG_BLOCK */ |
444 | ||
445 | static inline void printk_all_partitions(void) { } | |
446 | ||
edfaa7c3 KS |
447 | static inline dev_t blk_lookup_devt(const char *name) |
448 | { | |
449 | dev_t devt = MKDEV(0, 0); | |
450 | return devt; | |
451 | } | |
452 | ||
87c1efbf | 453 | #endif /* CONFIG_BLOCK */ |
9361401e DH |
454 | |
455 | #endif |