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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/types.h>
13#include <linux/kdev_t.h>
14
15#ifdef CONFIG_BLOCK
16
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
21extern struct device_type part_type;
22extern struct kobject *block_depr;
23extern struct class block_class;
24
25extern const struct seq_operations partitions_op;
26extern const struct seq_operations diskstats_op;
27
28enum {
29/* These three have identical behaviour; use the second one if DOS FDISK gets
30 confused about extended/logical partitions starting past cylinder 1023. */
31 DOS_EXTENDED_PARTITION = 5,
32 LINUX_EXTENDED_PARTITION = 0x85,
33 WIN98_EXTENDED_PARTITION = 0x0f,
34
35 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
36
37 LINUX_SWAP_PARTITION = 0x82,
38 LINUX_DATA_PARTITION = 0x83,
39 LINUX_LVM_PARTITION = 0x8e,
40 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
41
42 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
43 NEW_SOLARIS_X86_PARTITION = 0xbf,
44
45 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
46 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
47 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
48 EZD_PARTITION = 0x55, /* EZ-DRIVE */
49
50 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
51 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
52 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
53 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
54 MINIX_PARTITION = 0x81, /* Minix Partition ID */
55 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
56};
57
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#include <linux/workqueue.h>
64
65struct partition {
66 unsigned char boot_ind; /* 0x80 - active */
67 unsigned char head; /* starting head */
68 unsigned char sector; /* starting sector */
69 unsigned char cyl; /* starting cylinder */
70 unsigned char sys_ind; /* What partition type */
71 unsigned char end_head; /* end head */
72 unsigned char end_sector; /* end sector */
73 unsigned char end_cyl; /* end cylinder */
74 __le32 start_sect; /* starting sector counting from 0 */
75 __le32 nr_sects; /* nr of sectors in partition */
76} __attribute__((packed));
77
78struct disk_stats {
79 unsigned long sectors[2]; /* READs and WRITEs */
80 unsigned long ios[2];
81 unsigned long merges[2];
82 unsigned long ticks[2];
83 unsigned long io_ticks;
84 unsigned long time_in_queue;
85};
86
87struct hd_struct {
88 sector_t start_sect;
89 sector_t nr_sects;
90 struct device dev;
91 struct kobject *holder_dir;
92 int policy, partno;
93#ifdef CONFIG_FAIL_MAKE_REQUEST
94 int make_it_fail;
95#endif
96 unsigned long stamp;
97 int in_flight;
98#ifdef CONFIG_SMP
99 struct disk_stats *dkstats;
100#else
101 struct disk_stats dkstats;
102#endif
103};
104
105#define GENHD_FL_REMOVABLE 1
106#define GENHD_FL_DRIVERFS 2
107#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
108#define GENHD_FL_CD 8
109#define GENHD_FL_UP 16
110#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
111#define GENHD_FL_FAIL 64
112
113#define BLK_SCSI_MAX_CMDS (256)
114#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
115
116struct blk_scsi_cmd_filter {
117 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
118 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
119 struct kobject kobj;
120};
121
122struct gendisk {
123 int major; /* major number of driver */
124 int first_minor;
125 int minors; /* maximum number of minors, =1 for
126 * disks that can't be partitioned. */
127 char disk_name[32]; /* name of major driver */
128 struct hd_struct **part; /* [indexed by minor] */
129 struct block_device_operations *fops;
130 struct request_queue *queue;
131 struct blk_scsi_cmd_filter cmd_filter;
132 void *private_data;
133 sector_t capacity;
134
135 int flags;
136 struct device *driverfs_dev; // FIXME: remove
137 struct device dev;
138 struct kobject *holder_dir;
139 struct kobject *slave_dir;
140
141 struct timer_rand_state *random;
142 int policy;
143
144 atomic_t sync_io; /* RAID */
145 unsigned long stamp;
146 int in_flight;
147#ifdef CONFIG_SMP
148 struct disk_stats *dkstats;
149#else
150 struct disk_stats dkstats;
151#endif
152 struct work_struct async_notify;
153#ifdef CONFIG_BLK_DEV_INTEGRITY
154 struct blk_integrity *integrity;
155#endif
156};
157
158/*
159 * Macros to operate on percpu disk statistics:
160 *
161 * The __ variants should only be called in critical sections. The full
162 * variants disable/enable preemption.
163 */
164static inline struct hd_struct *get_part(struct gendisk *gendiskp,
165 sector_t sector)
166{
167 struct hd_struct *part;
168 int i;
169 for (i = 0; i < gendiskp->minors - 1; i++) {
170 part = gendiskp->part[i];
171 if (part && part->start_sect <= sector
172 && sector < part->start_sect + part->nr_sects)
173 return part;
174 }
175 return NULL;
176}
177
178#ifdef CONFIG_SMP
179#define __disk_stat_add(gendiskp, field, addnd) \
180 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
181
182#define disk_stat_read(gendiskp, field) \
183({ \
184 typeof(gendiskp->dkstats->field) res = 0; \
185 int i; \
186 for_each_possible_cpu(i) \
187 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
188 res; \
189})
190
191static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
192 int i;
193
194 for_each_possible_cpu(i)
195 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
196 sizeof(struct disk_stats));
197}
198
199#define __part_stat_add(part, field, addnd) \
200 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
201
202#define __all_stat_add(gendiskp, part, field, addnd, sector) \
203({ \
204 if (part) \
205 __part_stat_add(part, field, addnd); \
206 __disk_stat_add(gendiskp, field, addnd); \
207})
208
209#define part_stat_read(part, field) \
210({ \
211 typeof(part->dkstats->field) res = 0; \
212 int i; \
213 for_each_possible_cpu(i) \
214 res += per_cpu_ptr(part->dkstats, i)->field; \
215 res; \
216})
217
218static inline void part_stat_set_all(struct hd_struct *part, int value)
219{
220 int i;
221
222 for_each_possible_cpu(i)
223 memset(per_cpu_ptr(part->dkstats, i), value,
224 sizeof(struct disk_stats));
225}
226
227#else /* !CONFIG_SMP */
228#define __disk_stat_add(gendiskp, field, addnd) \
229 (gendiskp->dkstats.field += addnd)
230#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
231
232static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
233{
234 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
235}
236
237#define __part_stat_add(part, field, addnd) \
238 (part->dkstats.field += addnd)
239
240#define __all_stat_add(gendiskp, part, field, addnd, sector) \
241({ \
242 if (part) \
243 part->dkstats.field += addnd; \
244 __disk_stat_add(gendiskp, field, addnd); \
245})
246
247#define part_stat_read(part, field) (part->dkstats.field)
248
249static inline void part_stat_set_all(struct hd_struct *part, int value)
250{
251 memset(&part->dkstats, value, sizeof(struct disk_stats));
252}
253
254#endif /* CONFIG_SMP */
255
256#define disk_stat_add(gendiskp, field, addnd) \
257 do { \
258 preempt_disable(); \
259 __disk_stat_add(gendiskp, field, addnd); \
260 preempt_enable(); \
261 } while (0)
262
263#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
264#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
265
266#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
267#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
268
269#define __disk_stat_sub(gendiskp, field, subnd) \
270 __disk_stat_add(gendiskp, field, -subnd)
271#define disk_stat_sub(gendiskp, field, subnd) \
272 disk_stat_add(gendiskp, field, -subnd)
273
274#define part_stat_add(gendiskp, field, addnd) \
275 do { \
276 preempt_disable(); \
277 __part_stat_add(gendiskp, field, addnd);\
278 preempt_enable(); \
279 } while (0)
280
281#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
282#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
283
284#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
285#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
286
287#define __part_stat_sub(gendiskp, field, subnd) \
288 __part_stat_add(gendiskp, field, -subnd)
289#define part_stat_sub(gendiskp, field, subnd) \
290 part_stat_add(gendiskp, field, -subnd)
291
292#define all_stat_add(gendiskp, part, field, addnd, sector) \
293 do { \
294 preempt_disable(); \
295 __all_stat_add(gendiskp, part, field, addnd, sector); \
296 preempt_enable(); \
297 } while (0)
298
299#define __all_stat_dec(gendiskp, field, sector) \
300 __all_stat_add(gendiskp, field, -1, sector)
301#define all_stat_dec(gendiskp, field, sector) \
302 all_stat_add(gendiskp, field, -1, sector)
303
304#define __all_stat_inc(gendiskp, part, field, sector) \
305 __all_stat_add(gendiskp, part, field, 1, sector)
306#define all_stat_inc(gendiskp, part, field, sector) \
307 all_stat_add(gendiskp, part, field, 1, sector)
308
309#define __all_stat_sub(gendiskp, part, field, subnd, sector) \
310 __all_stat_add(gendiskp, part, field, -subnd, sector)
311#define all_stat_sub(gendiskp, part, field, subnd, sector) \
312 all_stat_add(gendiskp, part, field, -subnd, sector)
313
314/* Inlines to alloc and free disk stats in struct gendisk */
315#ifdef CONFIG_SMP
316static inline int init_disk_stats(struct gendisk *disk)
317{
318 disk->dkstats = alloc_percpu(struct disk_stats);
319 if (!disk->dkstats)
320 return 0;
321 return 1;
322}
323
324static inline void free_disk_stats(struct gendisk *disk)
325{
326 free_percpu(disk->dkstats);
327}
328
329static inline int init_part_stats(struct hd_struct *part)
330{
331 part->dkstats = alloc_percpu(struct disk_stats);
332 if (!part->dkstats)
333 return 0;
334 return 1;
335}
336
337static inline void free_part_stats(struct hd_struct *part)
338{
339 free_percpu(part->dkstats);
340}
341
342#else /* CONFIG_SMP */
343static inline int init_disk_stats(struct gendisk *disk)
344{
345 return 1;
346}
347
348static inline void free_disk_stats(struct gendisk *disk)
349{
350}
351
352static inline int init_part_stats(struct hd_struct *part)
353{
354 return 1;
355}
356
357static inline void free_part_stats(struct hd_struct *part)
358{
359}
360#endif /* CONFIG_SMP */
361
362/* drivers/block/ll_rw_blk.c */
363extern void disk_round_stats(struct gendisk *disk);
364extern void part_round_stats(struct hd_struct *part);
365
366/* drivers/block/genhd.c */
367extern int get_blkdev_list(char *, int);
368extern void add_disk(struct gendisk *disk);
369extern void del_gendisk(struct gendisk *gp);
370extern void unlink_gendisk(struct gendisk *gp);
371extern struct gendisk *get_gendisk(dev_t dev, int *part);
372
373extern void set_device_ro(struct block_device *bdev, int flag);
374extern void set_disk_ro(struct gendisk *disk, int flag);
375
376/* drivers/char/random.c */
377extern void add_disk_randomness(struct gendisk *disk);
378extern void rand_initialize_disk(struct gendisk *disk);
379
380static inline sector_t get_start_sect(struct block_device *bdev)
381{
382 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
383}
384static inline sector_t get_capacity(struct gendisk *disk)
385{
386 return disk->capacity;
387}
388static inline void set_capacity(struct gendisk *disk, sector_t size)
389{
390 disk->capacity = size;
391}
392
393#ifdef CONFIG_SOLARIS_X86_PARTITION
394
395#define SOLARIS_X86_NUMSLICE 16
396#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
397
398struct solaris_x86_slice {
399 __le16 s_tag; /* ID tag of partition */
400 __le16 s_flag; /* permission flags */
401 __le32 s_start; /* start sector no of partition */
402 __le32 s_size; /* # of blocks in partition */
403};
404
405struct solaris_x86_vtoc {
406 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
407 __le32 v_sanity; /* to verify vtoc sanity */
408 __le32 v_version; /* layout version */
409 char v_volume[8]; /* volume name */
410 __le16 v_sectorsz; /* sector size in bytes */
411 __le16 v_nparts; /* number of partitions */
412 unsigned int v_reserved[10]; /* free space */
413 struct solaris_x86_slice
414 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
415 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
416 char v_asciilabel[128]; /* for compatibility */
417};
418
419#endif /* CONFIG_SOLARIS_X86_PARTITION */
420
421#ifdef CONFIG_BSD_DISKLABEL
422/*
423 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
424 * updated by Marc Espie <Marc.Espie@openbsd.org>
425 */
426
427/* check against BSD src/sys/sys/disklabel.h for consistency */
428
429#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
430#define BSD_MAXPARTITIONS 16
431#define OPENBSD_MAXPARTITIONS 16
432#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
433struct bsd_disklabel {
434 __le32 d_magic; /* the magic number */
435 __s16 d_type; /* drive type */
436 __s16 d_subtype; /* controller/d_type specific */
437 char d_typename[16]; /* type name, e.g. "eagle" */
438 char d_packname[16]; /* pack identifier */
439 __u32 d_secsize; /* # of bytes per sector */
440 __u32 d_nsectors; /* # of data sectors per track */
441 __u32 d_ntracks; /* # of tracks per cylinder */
442 __u32 d_ncylinders; /* # of data cylinders per unit */
443 __u32 d_secpercyl; /* # of data sectors per cylinder */
444 __u32 d_secperunit; /* # of data sectors per unit */
445 __u16 d_sparespertrack; /* # of spare sectors per track */
446 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
447 __u32 d_acylinders; /* # of alt. cylinders per unit */
448 __u16 d_rpm; /* rotational speed */
449 __u16 d_interleave; /* hardware sector interleave */
450 __u16 d_trackskew; /* sector 0 skew, per track */
451 __u16 d_cylskew; /* sector 0 skew, per cylinder */
452 __u32 d_headswitch; /* head switch time, usec */
453 __u32 d_trkseek; /* track-to-track seek, usec */
454 __u32 d_flags; /* generic flags */
455#define NDDATA 5
456 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
457#define NSPARE 5
458 __u32 d_spare[NSPARE]; /* reserved for future use */
459 __le32 d_magic2; /* the magic number (again) */
460 __le16 d_checksum; /* xor of data incl. partitions */
461
462 /* filesystem and partition information: */
463 __le16 d_npartitions; /* number of partitions in following */
464 __le32 d_bbsize; /* size of boot area at sn0, bytes */
465 __le32 d_sbsize; /* max size of fs superblock, bytes */
466 struct bsd_partition { /* the partition table */
467 __le32 p_size; /* number of sectors in partition */
468 __le32 p_offset; /* starting sector */
469 __le32 p_fsize; /* filesystem basic fragment size */
470 __u8 p_fstype; /* filesystem type, see below */
471 __u8 p_frag; /* filesystem fragments per block */
472 __le16 p_cpg; /* filesystem cylinders per group */
473 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
474};
475
476#endif /* CONFIG_BSD_DISKLABEL */
477
478#ifdef CONFIG_UNIXWARE_DISKLABEL
479/*
480 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
481 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
482 */
483
484#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
485#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
486#define UNIXWARE_NUMSLICE 16
487#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
488
489struct unixware_slice {
490 __le16 s_label; /* label */
491 __le16 s_flags; /* permission flags */
492 __le32 start_sect; /* starting sector */
493 __le32 nr_sects; /* number of sectors in slice */
494};
495
496struct unixware_disklabel {
497 __le32 d_type; /* drive type */
498 __le32 d_magic; /* the magic number */
499 __le32 d_version; /* version number */
500 char d_serial[12]; /* serial number of the device */
501 __le32 d_ncylinders; /* # of data cylinders per device */
502 __le32 d_ntracks; /* # of tracks per cylinder */
503 __le32 d_nsectors; /* # of data sectors per track */
504 __le32 d_secsize; /* # of bytes per sector */
505 __le32 d_part_start; /* # of first sector of this partition */
506 __le32 d_unknown1[12]; /* ? */
507 __le32 d_alt_tbl; /* byte offset of alternate table */
508 __le32 d_alt_len; /* byte length of alternate table */
509 __le32 d_phys_cyl; /* # of physical cylinders per device */
510 __le32 d_phys_trk; /* # of physical tracks per cylinder */
511 __le32 d_phys_sec; /* # of physical sectors per track */
512 __le32 d_phys_bytes; /* # of physical bytes per sector */
513 __le32 d_unknown2; /* ? */
514 __le32 d_unknown3; /* ? */
515 __le32 d_pad[8]; /* pad */
516
517 struct unixware_vtoc {
518 __le32 v_magic; /* the magic number */
519 __le32 v_version; /* version number */
520 char v_name[8]; /* volume name */
521 __le16 v_nslices; /* # of slices */
522 __le16 v_unknown1; /* ? */
523 __le32 v_reserved[10]; /* reserved */
524 struct unixware_slice
525 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
526 } vtoc;
527
528}; /* 408 */
529
530#endif /* CONFIG_UNIXWARE_DISKLABEL */
531
532#ifdef CONFIG_MINIX_SUBPARTITION
533# define MINIX_NR_SUBPARTITIONS 4
534#endif /* CONFIG_MINIX_SUBPARTITION */
535
536#define ADDPART_FLAG_NONE 0
537#define ADDPART_FLAG_RAID 1
538#define ADDPART_FLAG_WHOLEDISK 2
539
540extern dev_t blk_lookup_devt(const char *name, int part);
541extern char *disk_name (struct gendisk *hd, int part, char *buf);
542
543extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
544extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
545extern void delete_partition(struct gendisk *, int);
546extern void printk_all_partitions(void);
547
548extern struct gendisk *alloc_disk_node(int minors, int node_id);
549extern struct gendisk *alloc_disk(int minors);
550extern struct kobject *get_disk(struct gendisk *disk);
551extern void put_disk(struct gendisk *disk);
552extern void blk_register_region(dev_t devt, unsigned long range,
553 struct module *module,
554 struct kobject *(*probe)(dev_t, int *, void *),
555 int (*lock)(dev_t, void *),
556 void *data);
557extern void blk_unregister_region(dev_t devt, unsigned long range);
558
559static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
560{
561 return bdget(MKDEV(disk->major, disk->first_minor) + index);
562}
563
564#else /* CONFIG_BLOCK */
565
566static inline void printk_all_partitions(void) { }
567
568static inline dev_t blk_lookup_devt(const char *name, int part)
569{
570 dev_t devt = MKDEV(0, 0);
571 return devt;
572}
573
574#endif /* CONFIG_BLOCK */
575
576#endif /* _LINUX_GENHD_H */