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