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>
15 #include <linux/slab.h>
19 #define kobj_to_dev(k) container_of((k), struct device, kobj)
20 #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
21 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
22 #define disk_to_dev(disk) (&(disk)->part0.__dev)
23 #define part_to_dev(part) (&((part)->__dev))
25 extern struct device_type part_type;
26 extern struct kobject *block_depr;
27 extern struct class block_class;
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 #define DISK_MAX_PARTS 256
60 #define DISK_NAME_LEN 32
62 #include <linux/major.h>
63 #include <linux/device.h>
64 #include <linux/smp.h>
65 #include <linux/string.h>
67 #include <linux/workqueue.h>
70 unsigned char boot_ind; /* 0x80 - active */
71 unsigned char head; /* starting head */
72 unsigned char sector; /* starting sector */
73 unsigned char cyl; /* starting cylinder */
74 unsigned char sys_ind; /* What partition type */
75 unsigned char end_head; /* end head */
76 unsigned char end_sector; /* end sector */
77 unsigned char end_cyl; /* end cylinder */
78 __le32 start_sect; /* starting sector counting from 0 */
79 __le32 nr_sects; /* nr of sectors in partition */
80 } __attribute__((packed));
83 unsigned long sectors[2]; /* READs and WRITEs */
85 unsigned long merges[2];
86 unsigned long ticks[2];
87 unsigned long io_ticks;
88 unsigned long time_in_queue;
91 #define PARTITION_META_INFO_VOLNAMELTH 64
92 #define PARTITION_META_INFO_UUIDLTH 16
94 struct partition_meta_info {
95 u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */
96 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
102 sector_t alignment_offset;
103 unsigned int discard_alignment;
105 struct kobject *holder_dir;
107 struct partition_meta_info *info;
108 #ifdef CONFIG_FAIL_MAKE_REQUEST
114 struct disk_stats __percpu *dkstats;
116 struct disk_stats dkstats;
118 struct rcu_head rcu_head;
121 #define GENHD_FL_REMOVABLE 1
123 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
124 #define GENHD_FL_CD 8
125 #define GENHD_FL_UP 16
126 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
127 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
128 #define GENHD_FL_NATIVE_CAPACITY 128
130 #define BLK_SCSI_MAX_CMDS (256)
131 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
133 struct blk_scsi_cmd_filter {
134 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
135 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
139 struct disk_part_tbl {
140 struct rcu_head rcu_head;
142 struct hd_struct __rcu *last_lookup;
143 struct gendisk *disk;
144 struct hd_struct __rcu *part[];
148 /* major, first_minor and minors are input parameters only,
149 * don't use directly. Use disk_devt() and disk_max_parts().
151 int major; /* major number of driver */
153 int minors; /* maximum number of minors, =1 for
154 * disks that can't be partitioned. */
156 char disk_name[DISK_NAME_LEN]; /* name of major driver */
157 char *(*devnode)(struct gendisk *gd, mode_t *mode);
158 /* Array of pointers to partitions indexed by partno.
159 * Protected with matching bdev lock but stat and other
160 * non-critical accesses use RCU. Always access through
163 struct disk_part_tbl __rcu *part_tbl;
164 struct hd_struct part0;
166 const struct block_device_operations *fops;
167 struct request_queue *queue;
171 struct device *driverfs_dev; // FIXME: remove
172 struct kobject *slave_dir;
174 struct timer_rand_state *random;
176 atomic_t sync_io; /* RAID */
177 struct work_struct async_notify;
178 #ifdef CONFIG_BLK_DEV_INTEGRITY
179 struct blk_integrity *integrity;
184 static inline struct gendisk *part_to_disk(struct hd_struct *part)
188 return dev_to_disk(part_to_dev(part)->parent);
190 return dev_to_disk(part_to_dev(part));
195 static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
198 for (i = 0; i < 16; ++i) {
199 *to++ = (hex_to_bin(*uuid_str) << 4) |
200 (hex_to_bin(*(uuid_str + 1)));
213 static inline char *part_unpack_uuid(const u8 *uuid, char *out)
215 sprintf(out, "%pU", uuid);
219 static inline int disk_max_parts(struct gendisk *disk)
221 if (disk->flags & GENHD_FL_EXT_DEVT)
222 return DISK_MAX_PARTS;
226 static inline bool disk_partitionable(struct gendisk *disk)
228 return disk_max_parts(disk) > 1;
231 static inline dev_t disk_devt(struct gendisk *disk)
233 return disk_to_dev(disk)->devt;
236 static inline dev_t part_devt(struct hd_struct *part)
238 return part_to_dev(part)->devt;
241 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
243 static inline void disk_put_part(struct hd_struct *part)
246 put_device(part_to_dev(part));
250 * Smarter partition iterator without context limits.
252 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
253 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
254 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
255 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
257 struct disk_part_iter {
258 struct gendisk *disk;
259 struct hd_struct *part;
264 extern void disk_part_iter_init(struct disk_part_iter *piter,
265 struct gendisk *disk, unsigned int flags);
266 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
267 extern void disk_part_iter_exit(struct disk_part_iter *piter);
269 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
273 * Macros to operate on percpu disk statistics:
275 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
276 * and should be called between disk_stat_lock() and
277 * disk_stat_unlock().
279 * part_stat_read() can be called at any time.
281 * part_stat_{add|set_all}() and {init|free}_part_stats are for
285 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
286 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
288 #define __part_stat_add(cpu, part, field, addnd) \
289 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
291 #define part_stat_read(part, field) \
293 typeof((part)->dkstats->field) res = 0; \
295 for_each_possible_cpu(_cpu) \
296 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
300 static inline void part_stat_set_all(struct hd_struct *part, int value)
304 for_each_possible_cpu(i)
305 memset(per_cpu_ptr(part->dkstats, i), value,
306 sizeof(struct disk_stats));
309 static inline int init_part_stats(struct hd_struct *part)
311 part->dkstats = alloc_percpu(struct disk_stats);
317 static inline void free_part_stats(struct hd_struct *part)
319 free_percpu(part->dkstats);
322 #else /* !CONFIG_SMP */
323 #define part_stat_lock() ({ rcu_read_lock(); 0; })
324 #define part_stat_unlock() rcu_read_unlock()
326 #define __part_stat_add(cpu, part, field, addnd) \
327 ((part)->dkstats.field += addnd)
329 #define part_stat_read(part, field) ((part)->dkstats.field)
331 static inline void part_stat_set_all(struct hd_struct *part, int value)
333 memset(&part->dkstats, value, sizeof(struct disk_stats));
336 static inline int init_part_stats(struct hd_struct *part)
341 static inline void free_part_stats(struct hd_struct *part)
345 #endif /* CONFIG_SMP */
347 #define part_stat_add(cpu, part, field, addnd) do { \
348 __part_stat_add((cpu), (part), field, addnd); \
349 if ((part)->partno) \
350 __part_stat_add((cpu), &part_to_disk((part))->part0, \
354 #define part_stat_dec(cpu, gendiskp, field) \
355 part_stat_add(cpu, gendiskp, field, -1)
356 #define part_stat_inc(cpu, gendiskp, field) \
357 part_stat_add(cpu, gendiskp, field, 1)
358 #define part_stat_sub(cpu, gendiskp, field, subnd) \
359 part_stat_add(cpu, gendiskp, field, -subnd)
361 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
363 part->in_flight[rw]++;
365 part_to_disk(part)->part0.in_flight[rw]++;
368 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
370 part->in_flight[rw]--;
372 part_to_disk(part)->part0.in_flight[rw]--;
375 static inline int part_in_flight(struct hd_struct *part)
377 return part->in_flight[0] + part->in_flight[1];
380 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
383 return kzalloc_node(sizeof(struct partition_meta_info),
384 GFP_KERNEL, disk->node_id);
385 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
388 static inline void free_part_info(struct hd_struct *part)
393 /* block/blk-core.c */
394 extern void part_round_stats(int cpu, struct hd_struct *part);
397 extern void add_disk(struct gendisk *disk);
398 extern void del_gendisk(struct gendisk *gp);
399 extern void unlink_gendisk(struct gendisk *gp);
400 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
401 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
403 extern void set_device_ro(struct block_device *bdev, int flag);
404 extern void set_disk_ro(struct gendisk *disk, int flag);
406 static inline int get_disk_ro(struct gendisk *disk)
408 return disk->part0.policy;
411 /* drivers/char/random.c */
412 extern void add_disk_randomness(struct gendisk *disk);
413 extern void rand_initialize_disk(struct gendisk *disk);
415 static inline sector_t get_start_sect(struct block_device *bdev)
417 return bdev->bd_part->start_sect;
419 static inline sector_t get_capacity(struct gendisk *disk)
421 return disk->part0.nr_sects;
423 static inline void set_capacity(struct gendisk *disk, sector_t size)
425 disk->part0.nr_sects = size;
428 #ifdef CONFIG_SOLARIS_X86_PARTITION
430 #define SOLARIS_X86_NUMSLICE 16
431 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
433 struct solaris_x86_slice {
434 __le16 s_tag; /* ID tag of partition */
435 __le16 s_flag; /* permission flags */
436 __le32 s_start; /* start sector no of partition */
437 __le32 s_size; /* # of blocks in partition */
440 struct solaris_x86_vtoc {
441 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
442 __le32 v_sanity; /* to verify vtoc sanity */
443 __le32 v_version; /* layout version */
444 char v_volume[8]; /* volume name */
445 __le16 v_sectorsz; /* sector size in bytes */
446 __le16 v_nparts; /* number of partitions */
447 unsigned int v_reserved[10]; /* free space */
448 struct solaris_x86_slice
449 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
450 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
451 char v_asciilabel[128]; /* for compatibility */
454 #endif /* CONFIG_SOLARIS_X86_PARTITION */
456 #ifdef CONFIG_BSD_DISKLABEL
458 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
459 * updated by Marc Espie <Marc.Espie@openbsd.org>
462 /* check against BSD src/sys/sys/disklabel.h for consistency */
464 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
465 #define BSD_MAXPARTITIONS 16
466 #define OPENBSD_MAXPARTITIONS 16
467 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
468 struct bsd_disklabel {
469 __le32 d_magic; /* the magic number */
470 __s16 d_type; /* drive type */
471 __s16 d_subtype; /* controller/d_type specific */
472 char d_typename[16]; /* type name, e.g. "eagle" */
473 char d_packname[16]; /* pack identifier */
474 __u32 d_secsize; /* # of bytes per sector */
475 __u32 d_nsectors; /* # of data sectors per track */
476 __u32 d_ntracks; /* # of tracks per cylinder */
477 __u32 d_ncylinders; /* # of data cylinders per unit */
478 __u32 d_secpercyl; /* # of data sectors per cylinder */
479 __u32 d_secperunit; /* # of data sectors per unit */
480 __u16 d_sparespertrack; /* # of spare sectors per track */
481 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
482 __u32 d_acylinders; /* # of alt. cylinders per unit */
483 __u16 d_rpm; /* rotational speed */
484 __u16 d_interleave; /* hardware sector interleave */
485 __u16 d_trackskew; /* sector 0 skew, per track */
486 __u16 d_cylskew; /* sector 0 skew, per cylinder */
487 __u32 d_headswitch; /* head switch time, usec */
488 __u32 d_trkseek; /* track-to-track seek, usec */
489 __u32 d_flags; /* generic flags */
491 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
493 __u32 d_spare[NSPARE]; /* reserved for future use */
494 __le32 d_magic2; /* the magic number (again) */
495 __le16 d_checksum; /* xor of data incl. partitions */
497 /* filesystem and partition information: */
498 __le16 d_npartitions; /* number of partitions in following */
499 __le32 d_bbsize; /* size of boot area at sn0, bytes */
500 __le32 d_sbsize; /* max size of fs superblock, bytes */
501 struct bsd_partition { /* the partition table */
502 __le32 p_size; /* number of sectors in partition */
503 __le32 p_offset; /* starting sector */
504 __le32 p_fsize; /* filesystem basic fragment size */
505 __u8 p_fstype; /* filesystem type, see below */
506 __u8 p_frag; /* filesystem fragments per block */
507 __le16 p_cpg; /* filesystem cylinders per group */
508 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
511 #endif /* CONFIG_BSD_DISKLABEL */
513 #ifdef CONFIG_UNIXWARE_DISKLABEL
515 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
516 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
519 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
520 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
521 #define UNIXWARE_NUMSLICE 16
522 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
524 struct unixware_slice {
525 __le16 s_label; /* label */
526 __le16 s_flags; /* permission flags */
527 __le32 start_sect; /* starting sector */
528 __le32 nr_sects; /* number of sectors in slice */
531 struct unixware_disklabel {
532 __le32 d_type; /* drive type */
533 __le32 d_magic; /* the magic number */
534 __le32 d_version; /* version number */
535 char d_serial[12]; /* serial number of the device */
536 __le32 d_ncylinders; /* # of data cylinders per device */
537 __le32 d_ntracks; /* # of tracks per cylinder */
538 __le32 d_nsectors; /* # of data sectors per track */
539 __le32 d_secsize; /* # of bytes per sector */
540 __le32 d_part_start; /* # of first sector of this partition */
541 __le32 d_unknown1[12]; /* ? */
542 __le32 d_alt_tbl; /* byte offset of alternate table */
543 __le32 d_alt_len; /* byte length of alternate table */
544 __le32 d_phys_cyl; /* # of physical cylinders per device */
545 __le32 d_phys_trk; /* # of physical tracks per cylinder */
546 __le32 d_phys_sec; /* # of physical sectors per track */
547 __le32 d_phys_bytes; /* # of physical bytes per sector */
548 __le32 d_unknown2; /* ? */
549 __le32 d_unknown3; /* ? */
550 __le32 d_pad[8]; /* pad */
552 struct unixware_vtoc {
553 __le32 v_magic; /* the magic number */
554 __le32 v_version; /* version number */
555 char v_name[8]; /* volume name */
556 __le16 v_nslices; /* # of slices */
557 __le16 v_unknown1; /* ? */
558 __le32 v_reserved[10]; /* reserved */
559 struct unixware_slice
560 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
565 #endif /* CONFIG_UNIXWARE_DISKLABEL */
567 #ifdef CONFIG_MINIX_SUBPARTITION
568 # define MINIX_NR_SUBPARTITIONS 4
569 #endif /* CONFIG_MINIX_SUBPARTITION */
571 #define ADDPART_FLAG_NONE 0
572 #define ADDPART_FLAG_RAID 1
573 #define ADDPART_FLAG_WHOLEDISK 2
575 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
576 extern void blk_free_devt(dev_t devt);
577 extern dev_t blk_lookup_devt(const char *name, int partno);
578 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
580 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
581 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
582 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
583 int partno, sector_t start,
584 sector_t len, int flags,
585 struct partition_meta_info
587 extern void delete_partition(struct gendisk *, int);
588 extern void printk_all_partitions(void);
590 extern struct gendisk *alloc_disk_node(int minors, int node_id);
591 extern struct gendisk *alloc_disk(int minors);
592 extern struct kobject *get_disk(struct gendisk *disk);
593 extern void put_disk(struct gendisk *disk);
594 extern void blk_register_region(dev_t devt, unsigned long range,
595 struct module *module,
596 struct kobject *(*probe)(dev_t, int *, void *),
597 int (*lock)(dev_t, void *),
599 extern void blk_unregister_region(dev_t devt, unsigned long range);
601 extern ssize_t part_size_show(struct device *dev,
602 struct device_attribute *attr, char *buf);
603 extern ssize_t part_stat_show(struct device *dev,
604 struct device_attribute *attr, char *buf);
605 extern ssize_t part_inflight_show(struct device *dev,
606 struct device_attribute *attr, char *buf);
607 #ifdef CONFIG_FAIL_MAKE_REQUEST
608 extern ssize_t part_fail_show(struct device *dev,
609 struct device_attribute *attr, char *buf);
610 extern ssize_t part_fail_store(struct device *dev,
611 struct device_attribute *attr,
612 const char *buf, size_t count);
613 #endif /* CONFIG_FAIL_MAKE_REQUEST */
615 #else /* CONFIG_BLOCK */
617 static inline void printk_all_partitions(void) { }
619 static inline dev_t blk_lookup_devt(const char *name, int partno)
621 dev_t devt = MKDEV(0, 0);
625 #endif /* CONFIG_BLOCK */
627 #endif /* _LINUX_GENHD_H */