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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/config.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/major.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/fs.h> | |
19 | ||
20 | enum { | |
21 | /* These three have identical behaviour; use the second one if DOS FDISK gets | |
22 | confused about extended/logical partitions starting past cylinder 1023. */ | |
23 | DOS_EXTENDED_PARTITION = 5, | |
24 | LINUX_EXTENDED_PARTITION = 0x85, | |
25 | WIN98_EXTENDED_PARTITION = 0x0f, | |
26 | ||
27 | LINUX_SWAP_PARTITION = 0x82, | |
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__ | |
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 | unsigned reads, read_sectors, writes, write_sectors; | |
82 | int policy, partno; | |
83 | }; | |
84 | ||
85 | #define GENHD_FL_REMOVABLE 1 | |
86 | #define GENHD_FL_DRIVERFS 2 | |
87 | #define GENHD_FL_CD 8 | |
88 | #define GENHD_FL_UP 16 | |
89 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
90 | ||
91 | struct disk_stats { | |
92 | unsigned read_sectors, write_sectors; | |
93 | unsigned reads, writes; | |
94 | unsigned read_merges, write_merges; | |
95 | unsigned read_ticks, write_ticks; | |
96 | unsigned io_ticks; | |
97 | unsigned time_in_queue; | |
98 | }; | |
99 | ||
100 | struct gendisk { | |
101 | int major; /* major number of driver */ | |
102 | int first_minor; | |
103 | int minors; /* maximum number of minors, =1 for | |
104 | * disks that can't be partitioned. */ | |
105 | char disk_name[32]; /* name of major driver */ | |
106 | struct hd_struct **part; /* [indexed by minor] */ | |
107 | struct block_device_operations *fops; | |
108 | struct request_queue *queue; | |
109 | void *private_data; | |
110 | sector_t capacity; | |
111 | ||
112 | int flags; | |
113 | char devfs_name[64]; /* devfs crap */ | |
114 | int number; /* more of the same */ | |
115 | struct device *driverfs_dev; | |
116 | struct kobject kobj; | |
117 | ||
118 | struct timer_rand_state *random; | |
119 | int policy; | |
120 | ||
121 | atomic_t sync_io; /* RAID */ | |
122 | unsigned long stamp, stamp_idle; | |
123 | int in_flight; | |
124 | #ifdef CONFIG_SMP | |
125 | struct disk_stats *dkstats; | |
126 | #else | |
127 | struct disk_stats dkstats; | |
128 | #endif | |
129 | }; | |
130 | ||
131 | /* Structure for sysfs attributes on block devices */ | |
132 | struct disk_attribute { | |
133 | struct attribute attr; | |
134 | ssize_t (*show)(struct gendisk *, char *); | |
135 | }; | |
136 | ||
137 | /* | |
138 | * Macros to operate on percpu disk statistics: | |
139 | * | |
140 | * The __ variants should only be called in critical sections. The full | |
141 | * variants disable/enable preemption. | |
142 | */ | |
143 | #ifdef CONFIG_SMP | |
144 | #define __disk_stat_add(gendiskp, field, addnd) \ | |
145 | (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) | |
146 | ||
147 | #define disk_stat_read(gendiskp, field) \ | |
148 | ({ \ | |
149 | typeof(gendiskp->dkstats->field) res = 0; \ | |
150 | int i; \ | |
151 | for (i=0; i < NR_CPUS; i++) { \ | |
152 | if (!cpu_possible(i)) \ | |
153 | continue; \ | |
154 | res += per_cpu_ptr(gendiskp->dkstats, i)->field; \ | |
155 | } \ | |
156 | res; \ | |
157 | }) | |
158 | ||
159 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { | |
160 | int i; | |
161 | for (i=0; i < NR_CPUS; i++) { | |
162 | if (cpu_possible(i)) { | |
163 | memset(per_cpu_ptr(gendiskp->dkstats, i), value, | |
164 | sizeof (struct disk_stats)); | |
165 | } | |
166 | } | |
167 | } | |
168 | ||
169 | #else | |
170 | #define __disk_stat_add(gendiskp, field, addnd) \ | |
171 | (gendiskp->dkstats.field += addnd) | |
172 | #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) | |
173 | ||
174 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { | |
175 | memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); | |
176 | } | |
177 | #endif | |
178 | ||
179 | #define disk_stat_add(gendiskp, field, addnd) \ | |
180 | do { \ | |
181 | preempt_disable(); \ | |
182 | __disk_stat_add(gendiskp, field, addnd); \ | |
183 | preempt_enable(); \ | |
184 | } while (0) | |
185 | ||
186 | #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1) | |
187 | #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) | |
188 | ||
189 | #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1) | |
190 | #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1) | |
191 | ||
192 | #define __disk_stat_sub(gendiskp, field, subnd) \ | |
193 | __disk_stat_add(gendiskp, field, -subnd) | |
194 | #define disk_stat_sub(gendiskp, field, subnd) \ | |
195 | disk_stat_add(gendiskp, field, -subnd) | |
196 | ||
197 | ||
198 | /* Inlines to alloc and free disk stats in struct gendisk */ | |
199 | #ifdef CONFIG_SMP | |
200 | static inline int init_disk_stats(struct gendisk *disk) | |
201 | { | |
202 | disk->dkstats = alloc_percpu(struct disk_stats); | |
203 | if (!disk->dkstats) | |
204 | return 0; | |
205 | return 1; | |
206 | } | |
207 | ||
208 | static inline void free_disk_stats(struct gendisk *disk) | |
209 | { | |
210 | free_percpu(disk->dkstats); | |
211 | } | |
212 | #else /* CONFIG_SMP */ | |
213 | static inline int init_disk_stats(struct gendisk *disk) | |
214 | { | |
215 | return 1; | |
216 | } | |
217 | ||
218 | static inline void free_disk_stats(struct gendisk *disk) | |
219 | { | |
220 | } | |
221 | #endif /* CONFIG_SMP */ | |
222 | ||
223 | /* drivers/block/ll_rw_blk.c */ | |
224 | extern void disk_round_stats(struct gendisk *disk); | |
225 | ||
226 | /* drivers/block/genhd.c */ | |
227 | extern int get_blkdev_list(char *); | |
228 | extern void add_disk(struct gendisk *disk); | |
229 | extern void del_gendisk(struct gendisk *gp); | |
230 | extern void unlink_gendisk(struct gendisk *gp); | |
231 | extern struct gendisk *get_gendisk(dev_t dev, int *part); | |
232 | ||
233 | extern void set_device_ro(struct block_device *bdev, int flag); | |
234 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
235 | ||
236 | /* drivers/char/random.c */ | |
237 | extern void add_disk_randomness(struct gendisk *disk); | |
238 | extern void rand_initialize_disk(struct gendisk *disk); | |
239 | ||
240 | static inline sector_t get_start_sect(struct block_device *bdev) | |
241 | { | |
242 | return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect; | |
243 | } | |
244 | static inline sector_t get_capacity(struct gendisk *disk) | |
245 | { | |
246 | return disk->capacity; | |
247 | } | |
248 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
249 | { | |
250 | disk->capacity = size; | |
251 | } | |
252 | ||
253 | #endif /* __KERNEL__ */ | |
254 | ||
255 | #ifdef CONFIG_SOLARIS_X86_PARTITION | |
256 | ||
257 | #define SOLARIS_X86_NUMSLICE 8 | |
258 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) | |
259 | ||
260 | struct solaris_x86_slice { | |
261 | __le16 s_tag; /* ID tag of partition */ | |
262 | __le16 s_flag; /* permission flags */ | |
263 | __le32 s_start; /* start sector no of partition */ | |
264 | __le32 s_size; /* # of blocks in partition */ | |
265 | }; | |
266 | ||
267 | struct solaris_x86_vtoc { | |
268 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
269 | __le32 v_sanity; /* to verify vtoc sanity */ | |
270 | __le32 v_version; /* layout version */ | |
271 | char v_volume[8]; /* volume name */ | |
272 | __le16 v_sectorsz; /* sector size in bytes */ | |
273 | __le16 v_nparts; /* number of partitions */ | |
274 | unsigned int v_reserved[10]; /* free space */ | |
275 | struct solaris_x86_slice | |
276 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
277 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
278 | char v_asciilabel[128]; /* for compatibility */ | |
279 | }; | |
280 | ||
281 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
282 | ||
283 | #ifdef CONFIG_BSD_DISKLABEL | |
284 | /* | |
285 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
286 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
287 | */ | |
288 | ||
289 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
290 | ||
291 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
292 | #define BSD_MAXPARTITIONS 16 | |
293 | #define OPENBSD_MAXPARTITIONS 16 | |
294 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
295 | struct bsd_disklabel { | |
296 | __le32 d_magic; /* the magic number */ | |
297 | __s16 d_type; /* drive type */ | |
298 | __s16 d_subtype; /* controller/d_type specific */ | |
299 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
300 | char d_packname[16]; /* pack identifier */ | |
301 | __u32 d_secsize; /* # of bytes per sector */ | |
302 | __u32 d_nsectors; /* # of data sectors per track */ | |
303 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
304 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
305 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
306 | __u32 d_secperunit; /* # of data sectors per unit */ | |
307 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
308 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
309 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
310 | __u16 d_rpm; /* rotational speed */ | |
311 | __u16 d_interleave; /* hardware sector interleave */ | |
312 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
313 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
314 | __u32 d_headswitch; /* head switch time, usec */ | |
315 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
316 | __u32 d_flags; /* generic flags */ | |
317 | #define NDDATA 5 | |
318 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
319 | #define NSPARE 5 | |
320 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
321 | __le32 d_magic2; /* the magic number (again) */ | |
322 | __le16 d_checksum; /* xor of data incl. partitions */ | |
323 | ||
324 | /* filesystem and partition information: */ | |
325 | __le16 d_npartitions; /* number of partitions in following */ | |
326 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
327 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
328 | struct bsd_partition { /* the partition table */ | |
329 | __le32 p_size; /* number of sectors in partition */ | |
330 | __le32 p_offset; /* starting sector */ | |
331 | __le32 p_fsize; /* filesystem basic fragment size */ | |
332 | __u8 p_fstype; /* filesystem type, see below */ | |
333 | __u8 p_frag; /* filesystem fragments per block */ | |
334 | __le16 p_cpg; /* filesystem cylinders per group */ | |
335 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
336 | }; | |
337 | ||
338 | #endif /* CONFIG_BSD_DISKLABEL */ | |
339 | ||
340 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
341 | /* | |
342 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
343 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
344 | */ | |
345 | ||
346 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
347 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
348 | #define UNIXWARE_NUMSLICE 16 | |
349 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
350 | ||
351 | struct unixware_slice { | |
352 | __le16 s_label; /* label */ | |
353 | __le16 s_flags; /* permission flags */ | |
354 | __le32 start_sect; /* starting sector */ | |
355 | __le32 nr_sects; /* number of sectors in slice */ | |
356 | }; | |
357 | ||
358 | struct unixware_disklabel { | |
359 | __le32 d_type; /* drive type */ | |
360 | __le32 d_magic; /* the magic number */ | |
361 | __le32 d_version; /* version number */ | |
362 | char d_serial[12]; /* serial number of the device */ | |
363 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
364 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
365 | __le32 d_nsectors; /* # of data sectors per track */ | |
366 | __le32 d_secsize; /* # of bytes per sector */ | |
367 | __le32 d_part_start; /* # of first sector of this partition */ | |
368 | __le32 d_unknown1[12]; /* ? */ | |
369 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
370 | __le32 d_alt_len; /* byte length of alternate table */ | |
371 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
372 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
373 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
374 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
375 | __le32 d_unknown2; /* ? */ | |
376 | __le32 d_unknown3; /* ? */ | |
377 | __le32 d_pad[8]; /* pad */ | |
378 | ||
379 | struct unixware_vtoc { | |
380 | __le32 v_magic; /* the magic number */ | |
381 | __le32 v_version; /* version number */ | |
382 | char v_name[8]; /* volume name */ | |
383 | __le16 v_nslices; /* # of slices */ | |
384 | __le16 v_unknown1; /* ? */ | |
385 | __le32 v_reserved[10]; /* reserved */ | |
386 | struct unixware_slice | |
387 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
388 | } vtoc; | |
389 | ||
390 | }; /* 408 */ | |
391 | ||
392 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
393 | ||
394 | #ifdef CONFIG_MINIX_SUBPARTITION | |
395 | # define MINIX_NR_SUBPARTITIONS 4 | |
396 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
397 | ||
398 | #ifdef __KERNEL__ | |
399 | ||
400 | char *disk_name (struct gendisk *hd, int part, char *buf); | |
401 | ||
402 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); | |
403 | extern void add_partition(struct gendisk *, int, sector_t, sector_t); | |
404 | extern void delete_partition(struct gendisk *, int); | |
405 | ||
1946089a | 406 | extern struct gendisk *alloc_disk_node(int minors, int node_id); |
1da177e4 LT |
407 | extern struct gendisk *alloc_disk(int minors); |
408 | extern struct kobject *get_disk(struct gendisk *disk); | |
409 | extern void put_disk(struct gendisk *disk); | |
410 | ||
411 | extern void blk_register_region(dev_t dev, unsigned long range, | |
412 | struct module *module, | |
413 | struct kobject *(*probe)(dev_t, int *, void *), | |
414 | int (*lock)(dev_t, void *), | |
415 | void *data); | |
416 | extern void blk_unregister_region(dev_t dev, unsigned long range); | |
417 | ||
418 | static inline struct block_device *bdget_disk(struct gendisk *disk, int index) | |
419 | { | |
420 | return bdget(MKDEV(disk->major, disk->first_minor) + index); | |
421 | } | |
422 | ||
423 | #endif | |
424 | ||
425 | #endif |