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, part0.__dev)
20 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
21 #define disk_to_dev(disk) (&(disk)->part0.__dev)
22 #define part_to_dev(part) (&((part)->__dev))
24 extern struct device_type part_type;
25 extern struct kobject *block_depr;
26 extern struct class block_class;
28 extern const struct seq_operations partitions_op;
29 extern const struct seq_operations diskstats_op;
32 /* These three have identical behaviour; use the second one if DOS FDISK gets
33 confused about extended/logical partitions starting past cylinder 1023. */
34 DOS_EXTENDED_PARTITION = 5,
35 LINUX_EXTENDED_PARTITION = 0x85,
36 WIN98_EXTENDED_PARTITION = 0x0f,
38 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
40 LINUX_SWAP_PARTITION = 0x82,
41 LINUX_DATA_PARTITION = 0x83,
42 LINUX_LVM_PARTITION = 0x8e,
43 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
45 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
46 NEW_SOLARIS_X86_PARTITION = 0xbf,
48 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
49 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
50 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
51 EZD_PARTITION = 0x55, /* EZ-DRIVE */
53 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
54 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
55 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
56 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
57 MINIX_PARTITION = 0x81, /* Minix Partition ID */
58 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
61 #include <linux/major.h>
62 #include <linux/device.h>
63 #include <linux/smp.h>
64 #include <linux/string.h>
66 #include <linux/workqueue.h>
69 unsigned char boot_ind; /* 0x80 - active */
70 unsigned char head; /* starting head */
71 unsigned char sector; /* starting sector */
72 unsigned char cyl; /* starting cylinder */
73 unsigned char sys_ind; /* What partition type */
74 unsigned char end_head; /* end head */
75 unsigned char end_sector; /* end sector */
76 unsigned char end_cyl; /* end cylinder */
77 __le32 start_sect; /* starting sector counting from 0 */
78 __le32 nr_sects; /* nr of sectors in partition */
79 } __attribute__((packed));
82 unsigned long sectors[2]; /* READs and WRITEs */
84 unsigned long merges[2];
85 unsigned long ticks[2];
86 unsigned long io_ticks;
87 unsigned long time_in_queue;
94 struct kobject *holder_dir;
96 #ifdef CONFIG_FAIL_MAKE_REQUEST
102 struct disk_stats *dkstats;
104 struct disk_stats dkstats;
106 struct rcu_head rcu_head;
109 #define GENHD_FL_REMOVABLE 1
110 #define GENHD_FL_DRIVERFS 2
111 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
112 #define GENHD_FL_CD 8
113 #define GENHD_FL_UP 16
114 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
117 /* major, first_minor, minors and ext_minors are input
118 * parameters only, don't use directly. Use disk_devt() and
121 int major; /* major number of driver */
123 int minors; /* maximum number of minors, =1 for
124 * disks that can't be partitioned. */
125 int ext_minors; /* number of extended dynamic minors */
127 char disk_name[32]; /* name of major driver */
129 /* Array of pointers to partitions indexed by partno.
130 * Protected with matching bdev lock but stat and other
131 * non-critical accesses use RCU. Always access through
134 struct hd_struct **__part;
135 struct hd_struct part0;
137 struct block_device_operations *fops;
138 struct request_queue *queue;
142 struct device *driverfs_dev; // FIXME: remove
143 struct kobject *slave_dir;
145 struct timer_rand_state *random;
147 atomic_t sync_io; /* RAID */
148 struct work_struct async_notify;
149 #ifdef CONFIG_BLK_DEV_INTEGRITY
150 struct blk_integrity *integrity;
154 static inline struct gendisk *part_to_disk(struct hd_struct *part)
158 return dev_to_disk(part_to_dev(part)->parent);
160 return dev_to_disk(part_to_dev(part));
165 static inline int disk_max_parts(struct gendisk *disk)
167 return disk->minors + disk->ext_minors;
170 static inline bool disk_partitionable(struct gendisk *disk)
172 return disk_max_parts(disk) > 1;
175 static inline dev_t disk_devt(struct gendisk *disk)
177 return disk_to_dev(disk)->devt;
180 static inline dev_t part_devt(struct hd_struct *part)
182 return part_to_dev(part)->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_to_dev(part));
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 */
198 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
200 struct disk_part_iter {
201 struct gendisk *disk;
202 struct hd_struct *part;
207 extern void disk_part_iter_init(struct disk_part_iter *piter,
208 struct gendisk *disk, unsigned int flags);
209 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
210 extern void disk_part_iter_exit(struct disk_part_iter *piter);
212 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
216 * Macros to operate on percpu disk statistics:
218 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
219 * and should be called between disk_stat_lock() and
220 * disk_stat_unlock().
222 * part_stat_read() can be called at any time.
224 * part_stat_{add|set_all}() and {init|free}_part_stats are for
228 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
229 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
231 #define __part_stat_add(cpu, part, field, addnd) \
232 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
234 #define part_stat_read(part, field) \
236 typeof((part)->dkstats->field) res = 0; \
238 for_each_possible_cpu(i) \
239 res += per_cpu_ptr((part)->dkstats, i)->field; \
243 static inline void part_stat_set_all(struct hd_struct *part, int value)
247 for_each_possible_cpu(i)
248 memset(per_cpu_ptr(part->dkstats, i), value,
249 sizeof(struct disk_stats));
252 static inline int init_part_stats(struct hd_struct *part)
254 part->dkstats = alloc_percpu(struct disk_stats);
260 static inline void free_part_stats(struct hd_struct *part)
262 free_percpu(part->dkstats);
265 #else /* !CONFIG_SMP */
266 #define part_stat_lock() ({ rcu_read_lock(); 0; })
267 #define part_stat_unlock() rcu_read_unlock()
269 #define __part_stat_add(cpu, part, field, addnd) \
270 ((part)->dkstats.field += addnd)
272 #define part_stat_read(part, field) ((part)->dkstats.field)
274 static inline void part_stat_set_all(struct hd_struct *part, int value)
276 memset(&part->dkstats, value, sizeof(struct disk_stats));
279 static inline int init_part_stats(struct hd_struct *part)
284 static inline void free_part_stats(struct hd_struct *part)
288 #endif /* CONFIG_SMP */
290 #define part_stat_add(cpu, part, field, addnd) do { \
291 __part_stat_add((cpu), (part), field, addnd); \
292 if ((part)->partno) \
293 __part_stat_add((cpu), &part_to_disk((part))->part0, \
297 #define part_stat_dec(cpu, gendiskp, field) \
298 part_stat_add(cpu, gendiskp, field, -1)
299 #define part_stat_inc(cpu, gendiskp, field) \
300 part_stat_add(cpu, gendiskp, field, 1)
301 #define part_stat_sub(cpu, gendiskp, field, subnd) \
302 part_stat_add(cpu, gendiskp, field, -subnd)
304 static inline void part_inc_in_flight(struct hd_struct *part)
308 part_to_disk(part)->part0.in_flight++;
311 static inline void part_dec_in_flight(struct hd_struct *part)
315 part_to_disk(part)->part0.in_flight--;
318 /* drivers/block/ll_rw_blk.c */
319 extern void part_round_stats(int cpu, struct hd_struct *part);
321 /* drivers/block/genhd.c */
322 extern int get_blkdev_list(char *, int);
323 extern void add_disk(struct gendisk *disk);
324 extern void del_gendisk(struct gendisk *gp);
325 extern void unlink_gendisk(struct gendisk *gp);
326 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
327 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
329 extern void set_device_ro(struct block_device *bdev, int flag);
330 extern void set_disk_ro(struct gendisk *disk, int flag);
332 static inline int get_disk_ro(struct gendisk *disk)
334 return disk->part0.policy;
337 /* drivers/char/random.c */
338 extern void add_disk_randomness(struct gendisk *disk);
339 extern void rand_initialize_disk(struct gendisk *disk);
341 static inline sector_t get_start_sect(struct block_device *bdev)
343 return bdev->bd_part->start_sect;
345 static inline sector_t get_capacity(struct gendisk *disk)
347 return disk->part0.nr_sects;
349 static inline void set_capacity(struct gendisk *disk, sector_t size)
351 disk->part0.nr_sects = size;
354 #ifdef CONFIG_SOLARIS_X86_PARTITION
356 #define SOLARIS_X86_NUMSLICE 16
357 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
359 struct solaris_x86_slice {
360 __le16 s_tag; /* ID tag of partition */
361 __le16 s_flag; /* permission flags */
362 __le32 s_start; /* start sector no of partition */
363 __le32 s_size; /* # of blocks in partition */
366 struct solaris_x86_vtoc {
367 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
368 __le32 v_sanity; /* to verify vtoc sanity */
369 __le32 v_version; /* layout version */
370 char v_volume[8]; /* volume name */
371 __le16 v_sectorsz; /* sector size in bytes */
372 __le16 v_nparts; /* number of partitions */
373 unsigned int v_reserved[10]; /* free space */
374 struct solaris_x86_slice
375 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
376 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
377 char v_asciilabel[128]; /* for compatibility */
380 #endif /* CONFIG_SOLARIS_X86_PARTITION */
382 #ifdef CONFIG_BSD_DISKLABEL
384 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
385 * updated by Marc Espie <Marc.Espie@openbsd.org>
388 /* check against BSD src/sys/sys/disklabel.h for consistency */
390 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
391 #define BSD_MAXPARTITIONS 16
392 #define OPENBSD_MAXPARTITIONS 16
393 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
394 struct bsd_disklabel {
395 __le32 d_magic; /* the magic number */
396 __s16 d_type; /* drive type */
397 __s16 d_subtype; /* controller/d_type specific */
398 char d_typename[16]; /* type name, e.g. "eagle" */
399 char d_packname[16]; /* pack identifier */
400 __u32 d_secsize; /* # of bytes per sector */
401 __u32 d_nsectors; /* # of data sectors per track */
402 __u32 d_ntracks; /* # of tracks per cylinder */
403 __u32 d_ncylinders; /* # of data cylinders per unit */
404 __u32 d_secpercyl; /* # of data sectors per cylinder */
405 __u32 d_secperunit; /* # of data sectors per unit */
406 __u16 d_sparespertrack; /* # of spare sectors per track */
407 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
408 __u32 d_acylinders; /* # of alt. cylinders per unit */
409 __u16 d_rpm; /* rotational speed */
410 __u16 d_interleave; /* hardware sector interleave */
411 __u16 d_trackskew; /* sector 0 skew, per track */
412 __u16 d_cylskew; /* sector 0 skew, per cylinder */
413 __u32 d_headswitch; /* head switch time, usec */
414 __u32 d_trkseek; /* track-to-track seek, usec */
415 __u32 d_flags; /* generic flags */
417 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
419 __u32 d_spare[NSPARE]; /* reserved for future use */
420 __le32 d_magic2; /* the magic number (again) */
421 __le16 d_checksum; /* xor of data incl. partitions */
423 /* filesystem and partition information: */
424 __le16 d_npartitions; /* number of partitions in following */
425 __le32 d_bbsize; /* size of boot area at sn0, bytes */
426 __le32 d_sbsize; /* max size of fs superblock, bytes */
427 struct bsd_partition { /* the partition table */
428 __le32 p_size; /* number of sectors in partition */
429 __le32 p_offset; /* starting sector */
430 __le32 p_fsize; /* filesystem basic fragment size */
431 __u8 p_fstype; /* filesystem type, see below */
432 __u8 p_frag; /* filesystem fragments per block */
433 __le16 p_cpg; /* filesystem cylinders per group */
434 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
437 #endif /* CONFIG_BSD_DISKLABEL */
439 #ifdef CONFIG_UNIXWARE_DISKLABEL
441 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
442 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
445 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
446 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
447 #define UNIXWARE_NUMSLICE 16
448 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
450 struct unixware_slice {
451 __le16 s_label; /* label */
452 __le16 s_flags; /* permission flags */
453 __le32 start_sect; /* starting sector */
454 __le32 nr_sects; /* number of sectors in slice */
457 struct unixware_disklabel {
458 __le32 d_type; /* drive type */
459 __le32 d_magic; /* the magic number */
460 __le32 d_version; /* version number */
461 char d_serial[12]; /* serial number of the device */
462 __le32 d_ncylinders; /* # of data cylinders per device */
463 __le32 d_ntracks; /* # of tracks per cylinder */
464 __le32 d_nsectors; /* # of data sectors per track */
465 __le32 d_secsize; /* # of bytes per sector */
466 __le32 d_part_start; /* # of first sector of this partition */
467 __le32 d_unknown1[12]; /* ? */
468 __le32 d_alt_tbl; /* byte offset of alternate table */
469 __le32 d_alt_len; /* byte length of alternate table */
470 __le32 d_phys_cyl; /* # of physical cylinders per device */
471 __le32 d_phys_trk; /* # of physical tracks per cylinder */
472 __le32 d_phys_sec; /* # of physical sectors per track */
473 __le32 d_phys_bytes; /* # of physical bytes per sector */
474 __le32 d_unknown2; /* ? */
475 __le32 d_unknown3; /* ? */
476 __le32 d_pad[8]; /* pad */
478 struct unixware_vtoc {
479 __le32 v_magic; /* the magic number */
480 __le32 v_version; /* version number */
481 char v_name[8]; /* volume name */
482 __le16 v_nslices; /* # of slices */
483 __le16 v_unknown1; /* ? */
484 __le32 v_reserved[10]; /* reserved */
485 struct unixware_slice
486 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
491 #endif /* CONFIG_UNIXWARE_DISKLABEL */
493 #ifdef CONFIG_MINIX_SUBPARTITION
494 # define MINIX_NR_SUBPARTITIONS 4
495 #endif /* CONFIG_MINIX_SUBPARTITION */
497 #define ADDPART_FLAG_NONE 0
498 #define ADDPART_FLAG_RAID 1
499 #define ADDPART_FLAG_WHOLEDISK 2
501 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
502 extern void blk_free_devt(dev_t devt);
503 extern dev_t blk_lookup_devt(const char *name, int partno);
504 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
506 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
507 extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
508 extern void delete_partition(struct gendisk *, int);
509 extern void printk_all_partitions(void);
511 extern struct gendisk *alloc_disk_node(int minors, int node_id);
512 extern struct gendisk *alloc_disk(int minors);
513 extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
515 extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
516 extern struct kobject *get_disk(struct gendisk *disk);
517 extern void put_disk(struct gendisk *disk);
518 extern void blk_register_region(dev_t devt, unsigned long range,
519 struct module *module,
520 struct kobject *(*probe)(dev_t, int *, void *),
521 int (*lock)(dev_t, void *),
523 extern void blk_unregister_region(dev_t devt, unsigned long range);
525 extern ssize_t part_size_show(struct device *dev,
526 struct device_attribute *attr, char *buf);
527 extern ssize_t part_stat_show(struct device *dev,
528 struct device_attribute *attr, char *buf);
529 #ifdef CONFIG_FAIL_MAKE_REQUEST
530 extern ssize_t part_fail_show(struct device *dev,
531 struct device_attribute *attr, char *buf);
532 extern ssize_t part_fail_store(struct device *dev,
533 struct device_attribute *attr,
534 const char *buf, size_t count);
535 #endif /* CONFIG_FAIL_MAKE_REQUEST */
537 #else /* CONFIG_BLOCK */
539 static inline void printk_all_partitions(void) { }
541 static inline dev_t blk_lookup_devt(const char *name, int partno)
543 dev_t devt = MKDEV(0, 0);
547 #endif /* CONFIG_BLOCK */
549 #endif /* _LINUX_GENHD_H */