5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
12 #include <linux/types.h>
13 #include <linux/kdev_t.h>
14 #include <linux/rcupdate.h>
18 #define kobj_to_dev(k) container_of(k, struct device, kobj)
19 #define dev_to_disk(device) container_of(device, struct gendisk, dev)
20 #define dev_to_part(device) container_of(device, struct hd_struct, dev)
22 extern struct device_type part_type;
23 extern struct kobject *block_depr;
24 extern struct class block_class;
26 extern const struct seq_operations partitions_op;
27 extern const struct seq_operations diskstats_op;
30 /* These three have identical behaviour; use the second one if DOS FDISK gets
31 confused about extended/logical partitions starting past cylinder 1023. */
32 DOS_EXTENDED_PARTITION = 5,
33 LINUX_EXTENDED_PARTITION = 0x85,
34 WIN98_EXTENDED_PARTITION = 0x0f,
36 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
38 LINUX_SWAP_PARTITION = 0x82,
39 LINUX_DATA_PARTITION = 0x83,
40 LINUX_LVM_PARTITION = 0x8e,
41 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
43 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
44 NEW_SOLARIS_X86_PARTITION = 0xbf,
46 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
47 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
48 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
49 EZD_PARTITION = 0x55, /* EZ-DRIVE */
51 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
52 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
53 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
54 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
55 MINIX_PARTITION = 0x81, /* Minix Partition ID */
56 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
59 #include <linux/major.h>
60 #include <linux/device.h>
61 #include <linux/smp.h>
62 #include <linux/string.h>
64 #include <linux/workqueue.h>
67 unsigned char boot_ind; /* 0x80 - active */
68 unsigned char head; /* starting head */
69 unsigned char sector; /* starting sector */
70 unsigned char cyl; /* starting cylinder */
71 unsigned char sys_ind; /* What partition type */
72 unsigned char end_head; /* end head */
73 unsigned char end_sector; /* end sector */
74 unsigned char end_cyl; /* end cylinder */
75 __le32 start_sect; /* starting sector counting from 0 */
76 __le32 nr_sects; /* nr of sectors in partition */
77 } __attribute__((packed));
80 unsigned long sectors[2]; /* READs and WRITEs */
82 unsigned long merges[2];
83 unsigned long ticks[2];
84 unsigned long io_ticks;
85 unsigned long time_in_queue;
92 struct kobject *holder_dir;
94 #ifdef CONFIG_FAIL_MAKE_REQUEST
100 struct disk_stats *dkstats;
102 struct disk_stats dkstats;
104 struct rcu_head rcu_head;
107 #define GENHD_FL_REMOVABLE 1
108 #define GENHD_FL_DRIVERFS 2
109 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
110 #define GENHD_FL_CD 8
111 #define GENHD_FL_UP 16
112 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
113 #define GENHD_FL_FAIL 64
116 /* major, first_minor, minors and ext_minors are input
117 * parameters only, don't use directly. Use disk_devt() and
120 int major; /* major number of driver */
122 int minors; /* maximum number of minors, =1 for
123 * disks that can't be partitioned. */
124 int ext_minors; /* number of extended dynamic minors */
126 char disk_name[32]; /* name of major driver */
128 /* Array of pointers to partitions indexed by partno - 1.
129 * Protected with matching bdev lock but stat and other
130 * non-critical accesses use RCU. Always access through
133 struct hd_struct **__part;
135 struct block_device_operations *fops;
136 struct request_queue *queue;
141 struct device *driverfs_dev; // FIXME: remove
143 struct kobject *holder_dir;
144 struct kobject *slave_dir;
146 struct timer_rand_state *random;
149 atomic_t sync_io; /* RAID */
153 struct disk_stats *dkstats;
155 struct disk_stats dkstats;
157 struct work_struct async_notify;
158 #ifdef CONFIG_BLK_DEV_INTEGRITY
159 struct blk_integrity *integrity;
163 static inline struct gendisk *part_to_disk(struct hd_struct *part)
166 return dev_to_disk((part)->dev.parent);
170 static inline int disk_max_parts(struct gendisk *disk)
172 return disk->minors + disk->ext_minors - 1;
175 static inline dev_t disk_devt(struct gendisk *disk)
177 return disk->dev.devt;
180 static inline dev_t part_devt(struct hd_struct *part)
182 return part->dev.devt;
185 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
187 static inline void disk_put_part(struct hd_struct *part)
190 put_device(&part->dev);
194 * Smarter partition iterator without context limits.
196 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
197 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
199 struct disk_part_iter {
200 struct gendisk *disk;
201 struct hd_struct *part;
206 extern void disk_part_iter_init(struct disk_part_iter *piter,
207 struct gendisk *disk, unsigned int flags);
208 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
209 extern void disk_part_iter_exit(struct disk_part_iter *piter);
211 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
215 * Macros to operate on percpu disk statistics:
217 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
218 * and should be called between disk_stat_lock() and
219 * disk_stat_unlock().
221 * part_stat_read() can be called at any time.
223 * part_stat_{add|set_all}() and {init|free}_part_stats are for
227 #define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); })
228 #define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
230 #define disk_stat_add(cpu, gendiskp, field, addnd) \
231 (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd)
233 #define disk_stat_read(gendiskp, field) \
235 typeof(gendiskp->dkstats->field) res = 0; \
237 for_each_possible_cpu(i) \
238 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
242 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
246 for_each_possible_cpu(i)
247 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
248 sizeof(struct disk_stats));
251 #define part_stat_add(cpu, part, field, addnd) \
252 (per_cpu_ptr(part->dkstats, cpu)->field += addnd)
254 #define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
257 part_stat_add(cpu, part, field, addnd); \
258 disk_stat_add(cpu, gendiskp, field, addnd); \
261 #define part_stat_read(part, field) \
263 typeof(part->dkstats->field) res = 0; \
265 for_each_possible_cpu(i) \
266 res += per_cpu_ptr(part->dkstats, i)->field; \
270 static inline void part_stat_set_all(struct hd_struct *part, int value)
274 for_each_possible_cpu(i)
275 memset(per_cpu_ptr(part->dkstats, i), value,
276 sizeof(struct disk_stats));
279 #else /* !CONFIG_SMP */
280 #define disk_stat_lock() ({ rcu_read_lock(); 0; })
281 #define disk_stat_unlock() rcu_read_unlock()
283 #define disk_stat_add(cpu, gendiskp, field, addnd) \
284 (gendiskp->dkstats.field += addnd)
285 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
287 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
289 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
292 #define part_stat_add(cpu, part, field, addnd) \
293 (part->dkstats.field += addnd)
295 #define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
298 part_stat_add(cpu, part, field, addnd); \
299 disk_stat_add(cpu, gendiskp, field, addnd); \
302 #define part_stat_read(part, field) (part->dkstats.field)
304 static inline void part_stat_set_all(struct hd_struct *part, int value)
306 memset(&part->dkstats, value, sizeof(struct disk_stats));
309 #endif /* CONFIG_SMP */
311 #define disk_stat_dec(cpu, gendiskp, field) \
312 disk_stat_add(cpu, gendiskp, field, -1)
313 #define disk_stat_inc(cpu, gendiskp, field) \
314 disk_stat_add(cpu, gendiskp, field, 1)
315 #define disk_stat_sub(cpu, gendiskp, field, subnd) \
316 disk_stat_add(cpu, gendiskp, field, -subnd)
318 #define part_stat_dec(cpu, gendiskp, field) \
319 part_stat_add(cpu, gendiskp, field, -1)
320 #define part_stat_inc(cpu, gendiskp, field) \
321 part_stat_add(cpu, gendiskp, field, 1)
322 #define part_stat_sub(cpu, gendiskp, field, subnd) \
323 part_stat_add(cpu, gendiskp, field, -subnd)
325 #define all_stat_dec(cpu, gendiskp, field, sector) \
326 all_stat_add(cpu, gendiskp, field, -1, sector)
327 #define all_stat_inc(cpu, gendiskp, part, field, sector) \
328 all_stat_add(cpu, gendiskp, part, field, 1, sector)
329 #define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \
330 all_stat_add(cpu, gendiskp, part, field, -subnd, sector)
332 /* Inlines to alloc and free disk stats in struct gendisk */
334 static inline int init_disk_stats(struct gendisk *disk)
336 disk->dkstats = alloc_percpu(struct disk_stats);
342 static inline void free_disk_stats(struct gendisk *disk)
344 free_percpu(disk->dkstats);
347 static inline int init_part_stats(struct hd_struct *part)
349 part->dkstats = alloc_percpu(struct disk_stats);
355 static inline void free_part_stats(struct hd_struct *part)
357 free_percpu(part->dkstats);
360 #else /* CONFIG_SMP */
361 static inline int init_disk_stats(struct gendisk *disk)
366 static inline void free_disk_stats(struct gendisk *disk)
370 static inline int init_part_stats(struct hd_struct *part)
375 static inline void free_part_stats(struct hd_struct *part)
378 #endif /* CONFIG_SMP */
380 /* drivers/block/ll_rw_blk.c */
381 extern void disk_round_stats(int cpu, struct gendisk *disk);
382 extern void part_round_stats(int cpu, struct hd_struct *part);
384 /* drivers/block/genhd.c */
385 extern int get_blkdev_list(char *, int);
386 extern void add_disk(struct gendisk *disk);
387 extern void del_gendisk(struct gendisk *gp);
388 extern void unlink_gendisk(struct gendisk *gp);
389 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
390 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
392 extern void set_device_ro(struct block_device *bdev, int flag);
393 extern void set_disk_ro(struct gendisk *disk, int flag);
395 /* drivers/char/random.c */
396 extern void add_disk_randomness(struct gendisk *disk);
397 extern void rand_initialize_disk(struct gendisk *disk);
399 static inline sector_t get_start_sect(struct block_device *bdev)
401 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
403 static inline sector_t get_capacity(struct gendisk *disk)
405 return disk->capacity;
407 static inline void set_capacity(struct gendisk *disk, sector_t size)
409 disk->capacity = size;
412 #ifdef CONFIG_SOLARIS_X86_PARTITION
414 #define SOLARIS_X86_NUMSLICE 16
415 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
417 struct solaris_x86_slice {
418 __le16 s_tag; /* ID tag of partition */
419 __le16 s_flag; /* permission flags */
420 __le32 s_start; /* start sector no of partition */
421 __le32 s_size; /* # of blocks in partition */
424 struct solaris_x86_vtoc {
425 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
426 __le32 v_sanity; /* to verify vtoc sanity */
427 __le32 v_version; /* layout version */
428 char v_volume[8]; /* volume name */
429 __le16 v_sectorsz; /* sector size in bytes */
430 __le16 v_nparts; /* number of partitions */
431 unsigned int v_reserved[10]; /* free space */
432 struct solaris_x86_slice
433 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
434 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
435 char v_asciilabel[128]; /* for compatibility */
438 #endif /* CONFIG_SOLARIS_X86_PARTITION */
440 #ifdef CONFIG_BSD_DISKLABEL
442 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
443 * updated by Marc Espie <Marc.Espie@openbsd.org>
446 /* check against BSD src/sys/sys/disklabel.h for consistency */
448 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
449 #define BSD_MAXPARTITIONS 16
450 #define OPENBSD_MAXPARTITIONS 16
451 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
452 struct bsd_disklabel {
453 __le32 d_magic; /* the magic number */
454 __s16 d_type; /* drive type */
455 __s16 d_subtype; /* controller/d_type specific */
456 char d_typename[16]; /* type name, e.g. "eagle" */
457 char d_packname[16]; /* pack identifier */
458 __u32 d_secsize; /* # of bytes per sector */
459 __u32 d_nsectors; /* # of data sectors per track */
460 __u32 d_ntracks; /* # of tracks per cylinder */
461 __u32 d_ncylinders; /* # of data cylinders per unit */
462 __u32 d_secpercyl; /* # of data sectors per cylinder */
463 __u32 d_secperunit; /* # of data sectors per unit */
464 __u16 d_sparespertrack; /* # of spare sectors per track */
465 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
466 __u32 d_acylinders; /* # of alt. cylinders per unit */
467 __u16 d_rpm; /* rotational speed */
468 __u16 d_interleave; /* hardware sector interleave */
469 __u16 d_trackskew; /* sector 0 skew, per track */
470 __u16 d_cylskew; /* sector 0 skew, per cylinder */
471 __u32 d_headswitch; /* head switch time, usec */
472 __u32 d_trkseek; /* track-to-track seek, usec */
473 __u32 d_flags; /* generic flags */
475 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
477 __u32 d_spare[NSPARE]; /* reserved for future use */
478 __le32 d_magic2; /* the magic number (again) */
479 __le16 d_checksum; /* xor of data incl. partitions */
481 /* filesystem and partition information: */
482 __le16 d_npartitions; /* number of partitions in following */
483 __le32 d_bbsize; /* size of boot area at sn0, bytes */
484 __le32 d_sbsize; /* max size of fs superblock, bytes */
485 struct bsd_partition { /* the partition table */
486 __le32 p_size; /* number of sectors in partition */
487 __le32 p_offset; /* starting sector */
488 __le32 p_fsize; /* filesystem basic fragment size */
489 __u8 p_fstype; /* filesystem type, see below */
490 __u8 p_frag; /* filesystem fragments per block */
491 __le16 p_cpg; /* filesystem cylinders per group */
492 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
495 #endif /* CONFIG_BSD_DISKLABEL */
497 #ifdef CONFIG_UNIXWARE_DISKLABEL
499 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
500 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
503 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
504 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
505 #define UNIXWARE_NUMSLICE 16
506 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
508 struct unixware_slice {
509 __le16 s_label; /* label */
510 __le16 s_flags; /* permission flags */
511 __le32 start_sect; /* starting sector */
512 __le32 nr_sects; /* number of sectors in slice */
515 struct unixware_disklabel {
516 __le32 d_type; /* drive type */
517 __le32 d_magic; /* the magic number */
518 __le32 d_version; /* version number */
519 char d_serial[12]; /* serial number of the device */
520 __le32 d_ncylinders; /* # of data cylinders per device */
521 __le32 d_ntracks; /* # of tracks per cylinder */
522 __le32 d_nsectors; /* # of data sectors per track */
523 __le32 d_secsize; /* # of bytes per sector */
524 __le32 d_part_start; /* # of first sector of this partition */
525 __le32 d_unknown1[12]; /* ? */
526 __le32 d_alt_tbl; /* byte offset of alternate table */
527 __le32 d_alt_len; /* byte length of alternate table */
528 __le32 d_phys_cyl; /* # of physical cylinders per device */
529 __le32 d_phys_trk; /* # of physical tracks per cylinder */
530 __le32 d_phys_sec; /* # of physical sectors per track */
531 __le32 d_phys_bytes; /* # of physical bytes per sector */
532 __le32 d_unknown2; /* ? */
533 __le32 d_unknown3; /* ? */
534 __le32 d_pad[8]; /* pad */
536 struct unixware_vtoc {
537 __le32 v_magic; /* the magic number */
538 __le32 v_version; /* version number */
539 char v_name[8]; /* volume name */
540 __le16 v_nslices; /* # of slices */
541 __le16 v_unknown1; /* ? */
542 __le32 v_reserved[10]; /* reserved */
543 struct unixware_slice
544 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
549 #endif /* CONFIG_UNIXWARE_DISKLABEL */
551 #ifdef CONFIG_MINIX_SUBPARTITION
552 # define MINIX_NR_SUBPARTITIONS 4
553 #endif /* CONFIG_MINIX_SUBPARTITION */
555 #define ADDPART_FLAG_NONE 0
556 #define ADDPART_FLAG_RAID 1
557 #define ADDPART_FLAG_WHOLEDISK 2
559 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
560 extern void blk_free_devt(dev_t devt);
561 extern dev_t blk_lookup_devt(const char *name, int partno);
562 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
564 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
565 extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
566 extern void delete_partition(struct gendisk *, int);
567 extern void printk_all_partitions(void);
569 extern struct gendisk *alloc_disk_node(int minors, int node_id);
570 extern struct gendisk *alloc_disk(int minors);
571 extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
573 extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
574 extern struct kobject *get_disk(struct gendisk *disk);
575 extern void put_disk(struct gendisk *disk);
576 extern void blk_register_region(dev_t devt, unsigned long range,
577 struct module *module,
578 struct kobject *(*probe)(dev_t, int *, void *),
579 int (*lock)(dev_t, void *),
581 extern void blk_unregister_region(dev_t devt, unsigned long range);
583 #else /* CONFIG_BLOCK */
585 static inline void printk_all_partitions(void) { }
587 static inline dev_t blk_lookup_devt(const char *name, int partno)
589 dev_t devt = MKDEV(0, 0);
593 #endif /* CONFIG_BLOCK */
595 #endif /* _LINUX_GENHD_H */