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#include <linux/rcupdate.h> 15 16#ifdef CONFIG_BLOCK 17 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)) 23 24extern struct device_type part_type; 25extern struct kobject *block_depr; 26extern struct class block_class; 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#define DISK_MAX_PARTS 256 59#define DISK_NAME_LEN 32 60 61#include <linux/major.h> 62#include <linux/device.h> 63#include <linux/smp.h> 64#include <linux/string.h> 65#include <linux/fs.h> 66#include <linux/workqueue.h> 67 68struct partition { 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)); 80 81struct disk_stats { 82 unsigned long sectors[2]; /* READs and WRITEs */ 83 unsigned long ios[2]; 84 unsigned long merges[2]; 85 unsigned long ticks[2]; 86 unsigned long io_ticks; 87 unsigned long time_in_queue; 88}; 89 90struct hd_struct { 91 sector_t start_sect; 92 sector_t nr_sects; 93 sector_t alignment_offset; 94 unsigned int discard_alignment; 95 struct device __dev; 96 struct kobject *holder_dir; 97 int policy, partno; 98#ifdef CONFIG_FAIL_MAKE_REQUEST 99 int make_it_fail; 100#endif 101 unsigned long stamp; 102 int in_flight[2]; 103#ifdef CONFIG_SMP 104 struct disk_stats __percpu *dkstats; 105#else 106 struct disk_stats dkstats; 107#endif 108 struct rcu_head rcu_head; 109}; 110 111#define GENHD_FL_REMOVABLE 1 112/* 2 is unused */ 113#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 114#define GENHD_FL_CD 8 115#define GENHD_FL_UP 16 116#define GENHD_FL_SUPPRESS_PARTITION_INFO 32 117#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ 118#define GENHD_FL_NATIVE_CAPACITY 128 119 120#define BLK_SCSI_MAX_CMDS (256) 121#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 122 123struct blk_scsi_cmd_filter { 124 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; 125 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; 126 struct kobject kobj; 127}; 128 129struct disk_part_tbl { 130 struct rcu_head rcu_head; 131 int len; 132 struct hd_struct *last_lookup; 133 struct hd_struct *part[]; 134}; 135 136struct gendisk { 137 /* major, first_minor and minors are input parameters only, 138 * don't use directly. Use disk_devt() and disk_max_parts(). 139 */ 140 int major; /* major number of driver */ 141 int first_minor; 142 int minors; /* maximum number of minors, =1 for 143 * disks that can't be partitioned. */ 144 145 char disk_name[DISK_NAME_LEN]; /* name of major driver */ 146 char *(*devnode)(struct gendisk *gd, mode_t *mode); 147 /* Array of pointers to partitions indexed by partno. 148 * Protected with matching bdev lock but stat and other 149 * non-critical accesses use RCU. Always access through 150 * helpers. 151 */ 152 struct disk_part_tbl *part_tbl; 153 struct hd_struct part0; 154 155 const struct block_device_operations *fops; 156 struct request_queue *queue; 157 void *private_data; 158 159 int flags; 160 struct device *driverfs_dev; 161 struct kobject *slave_dir; 162 163 struct timer_rand_state *random; 164 165 atomic_t sync_io; /* RAID */ 166 struct work_struct async_notify; 167#ifdef CONFIG_BLK_DEV_INTEGRITY 168 struct blk_integrity *integrity; 169#endif 170 int node_id; 171}; 172 173static inline struct gendisk *part_to_disk(struct hd_struct *part) 174{ 175 if (likely(part)) { 176 if (part->partno) 177 return dev_to_disk(part_to_dev(part)->parent); 178 else 179 return dev_to_disk(part_to_dev(part)); 180 } 181 return NULL; 182} 183 184static inline int disk_max_parts(struct gendisk *disk) 185{ 186 if (disk->flags & GENHD_FL_EXT_DEVT) 187 return DISK_MAX_PARTS; 188 return disk->minors; 189} 190 191static inline bool disk_partitionable(struct gendisk *disk) 192{ 193 return disk_max_parts(disk) > 1; 194} 195 196static inline dev_t disk_devt(struct gendisk *disk) 197{ 198 return disk_to_dev(disk)->devt; 199} 200 201static inline dev_t part_devt(struct hd_struct *part) 202{ 203 return part_to_dev(part)->devt; 204} 205 206extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); 207 208static inline void disk_put_part(struct hd_struct *part) 209{ 210 if (likely(part)) 211 put_device(part_to_dev(part)); 212} 213 214/* 215 * Smarter partition iterator without context limits. 216 */ 217#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ 218#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ 219#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ 220#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ 221 222struct disk_part_iter { 223 struct gendisk *disk; 224 struct hd_struct *part; 225 int idx; 226 unsigned int flags; 227}; 228 229extern void disk_part_iter_init(struct disk_part_iter *piter, 230 struct gendisk *disk, unsigned int flags); 231extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); 232extern void disk_part_iter_exit(struct disk_part_iter *piter); 233 234extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, 235 sector_t sector); 236 237/* 238 * Macros to operate on percpu disk statistics: 239 * 240 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters 241 * and should be called between disk_stat_lock() and 242 * disk_stat_unlock(). 243 * 244 * part_stat_read() can be called at any time. 245 * 246 * part_stat_{add|set_all}() and {init|free}_part_stats are for 247 * internal use only. 248 */ 249#ifdef CONFIG_SMP 250#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) 251#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) 252 253#define __part_stat_add(cpu, part, field, addnd) \ 254 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) 255 256#define part_stat_read(part, field) \ 257({ \ 258 typeof((part)->dkstats->field) res = 0; \ 259 unsigned int _cpu; \ 260 for_each_possible_cpu(_cpu) \ 261 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ 262 res; \ 263}) 264 265static inline void part_stat_set_all(struct hd_struct *part, int value) 266{ 267 int i; 268 269 for_each_possible_cpu(i) 270 memset(per_cpu_ptr(part->dkstats, i), value, 271 sizeof(struct disk_stats)); 272} 273 274static inline int init_part_stats(struct hd_struct *part) 275{ 276 part->dkstats = alloc_percpu(struct disk_stats); 277 if (!part->dkstats) 278 return 0; 279 return 1; 280} 281 282static inline void free_part_stats(struct hd_struct *part) 283{ 284 free_percpu(part->dkstats); 285} 286 287#else /* !CONFIG_SMP */ 288#define part_stat_lock() ({ rcu_read_lock(); 0; }) 289#define part_stat_unlock() rcu_read_unlock() 290 291#define __part_stat_add(cpu, part, field, addnd) \ 292 ((part)->dkstats.field += addnd) 293 294#define part_stat_read(part, field) ((part)->dkstats.field) 295 296static inline void part_stat_set_all(struct hd_struct *part, int value) 297{ 298 memset(&part->dkstats, value, sizeof(struct disk_stats)); 299} 300 301static inline int init_part_stats(struct hd_struct *part) 302{ 303 return 1; 304} 305 306static inline void free_part_stats(struct hd_struct *part) 307{ 308} 309 310#endif /* CONFIG_SMP */ 311 312#define part_stat_add(cpu, part, field, addnd) do { \ 313 __part_stat_add((cpu), (part), field, addnd); \ 314 if ((part)->partno) \ 315 __part_stat_add((cpu), &part_to_disk((part))->part0, \ 316 field, addnd); \ 317} while (0) 318 319#define part_stat_dec(cpu, gendiskp, field) \ 320 part_stat_add(cpu, gendiskp, field, -1) 321#define part_stat_inc(cpu, gendiskp, field) \ 322 part_stat_add(cpu, gendiskp, field, 1) 323#define part_stat_sub(cpu, gendiskp, field, subnd) \ 324 part_stat_add(cpu, gendiskp, field, -subnd) 325 326static inline void part_inc_in_flight(struct hd_struct *part, int rw) 327{ 328 part->in_flight[rw]++; 329 if (part->partno) 330 part_to_disk(part)->part0.in_flight[rw]++; 331} 332 333static inline void part_dec_in_flight(struct hd_struct *part, int rw) 334{ 335 part->in_flight[rw]--; 336 if (part->partno) 337 part_to_disk(part)->part0.in_flight[rw]--; 338} 339 340static inline int part_in_flight(struct hd_struct *part) 341{ 342 return part->in_flight[0] + part->in_flight[1]; 343} 344 345/* block/blk-core.c */ 346extern void part_round_stats(int cpu, struct hd_struct *part); 347 348/* block/genhd.c */ 349extern void add_disk(struct gendisk *disk); 350extern void del_gendisk(struct gendisk *gp); 351extern void unlink_gendisk(struct gendisk *gp); 352extern struct gendisk *get_gendisk(dev_t dev, int *partno); 353extern struct block_device *bdget_disk(struct gendisk *disk, int partno); 354 355extern void set_device_ro(struct block_device *bdev, int flag); 356extern void set_disk_ro(struct gendisk *disk, int flag); 357 358static inline int get_disk_ro(struct gendisk *disk) 359{ 360 return disk->part0.policy; 361} 362 363/* drivers/char/random.c */ 364extern void add_disk_randomness(struct gendisk *disk); 365extern void rand_initialize_disk(struct gendisk *disk); 366 367static inline sector_t get_start_sect(struct block_device *bdev) 368{ 369 return bdev->bd_part->start_sect; 370} 371static inline sector_t get_capacity(struct gendisk *disk) 372{ 373 return disk->part0.nr_sects; 374} 375static inline void set_capacity(struct gendisk *disk, sector_t size) 376{ 377 disk->part0.nr_sects = size; 378} 379 380#ifdef CONFIG_SOLARIS_X86_PARTITION 381 382#define SOLARIS_X86_NUMSLICE 16 383#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) 384 385struct solaris_x86_slice { 386 __le16 s_tag; /* ID tag of partition */ 387 __le16 s_flag; /* permission flags */ 388 __le32 s_start; /* start sector no of partition */ 389 __le32 s_size; /* # of blocks in partition */ 390}; 391 392struct solaris_x86_vtoc { 393 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ 394 __le32 v_sanity; /* to verify vtoc sanity */ 395 __le32 v_version; /* layout version */ 396 char v_volume[8]; /* volume name */ 397 __le16 v_sectorsz; /* sector size in bytes */ 398 __le16 v_nparts; /* number of partitions */ 399 unsigned int v_reserved[10]; /* free space */ 400 struct solaris_x86_slice 401 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ 402 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ 403 char v_asciilabel[128]; /* for compatibility */ 404}; 405 406#endif /* CONFIG_SOLARIS_X86_PARTITION */ 407 408#ifdef CONFIG_BSD_DISKLABEL 409/* 410 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> 411 * updated by Marc Espie <Marc.Espie@openbsd.org> 412 */ 413 414/* check against BSD src/sys/sys/disklabel.h for consistency */ 415 416#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ 417#define BSD_MAXPARTITIONS 16 418#define OPENBSD_MAXPARTITIONS 16 419#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ 420struct bsd_disklabel { 421 __le32 d_magic; /* the magic number */ 422 __s16 d_type; /* drive type */ 423 __s16 d_subtype; /* controller/d_type specific */ 424 char d_typename[16]; /* type name, e.g. "eagle" */ 425 char d_packname[16]; /* pack identifier */ 426 __u32 d_secsize; /* # of bytes per sector */ 427 __u32 d_nsectors; /* # of data sectors per track */ 428 __u32 d_ntracks; /* # of tracks per cylinder */ 429 __u32 d_ncylinders; /* # of data cylinders per unit */ 430 __u32 d_secpercyl; /* # of data sectors per cylinder */ 431 __u32 d_secperunit; /* # of data sectors per unit */ 432 __u16 d_sparespertrack; /* # of spare sectors per track */ 433 __u16 d_sparespercyl; /* # of spare sectors per cylinder */ 434 __u32 d_acylinders; /* # of alt. cylinders per unit */ 435 __u16 d_rpm; /* rotational speed */ 436 __u16 d_interleave; /* hardware sector interleave */ 437 __u16 d_trackskew; /* sector 0 skew, per track */ 438 __u16 d_cylskew; /* sector 0 skew, per cylinder */ 439 __u32 d_headswitch; /* head switch time, usec */ 440 __u32 d_trkseek; /* track-to-track seek, usec */ 441 __u32 d_flags; /* generic flags */ 442#define NDDATA 5 443 __u32 d_drivedata[NDDATA]; /* drive-type specific information */ 444#define NSPARE 5 445 __u32 d_spare[NSPARE]; /* reserved for future use */ 446 __le32 d_magic2; /* the magic number (again) */ 447 __le16 d_checksum; /* xor of data incl. partitions */ 448 449 /* filesystem and partition information: */ 450 __le16 d_npartitions; /* number of partitions in following */ 451 __le32 d_bbsize; /* size of boot area at sn0, bytes */ 452 __le32 d_sbsize; /* max size of fs superblock, bytes */ 453 struct bsd_partition { /* the partition table */ 454 __le32 p_size; /* number of sectors in partition */ 455 __le32 p_offset; /* starting sector */ 456 __le32 p_fsize; /* filesystem basic fragment size */ 457 __u8 p_fstype; /* filesystem type, see below */ 458 __u8 p_frag; /* filesystem fragments per block */ 459 __le16 p_cpg; /* filesystem cylinders per group */ 460 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ 461}; 462 463#endif /* CONFIG_BSD_DISKLABEL */ 464 465#ifdef CONFIG_UNIXWARE_DISKLABEL 466/* 467 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> 468 * and Krzysztof G. Baranowski <kgb@knm.org.pl> 469 */ 470 471#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ 472#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ 473#define UNIXWARE_NUMSLICE 16 474#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ 475 476struct unixware_slice { 477 __le16 s_label; /* label */ 478 __le16 s_flags; /* permission flags */ 479 __le32 start_sect; /* starting sector */ 480 __le32 nr_sects; /* number of sectors in slice */ 481}; 482 483struct unixware_disklabel { 484 __le32 d_type; /* drive type */ 485 __le32 d_magic; /* the magic number */ 486 __le32 d_version; /* version number */ 487 char d_serial[12]; /* serial number of the device */ 488 __le32 d_ncylinders; /* # of data cylinders per device */ 489 __le32 d_ntracks; /* # of tracks per cylinder */ 490 __le32 d_nsectors; /* # of data sectors per track */ 491 __le32 d_secsize; /* # of bytes per sector */ 492 __le32 d_part_start; /* # of first sector of this partition */ 493 __le32 d_unknown1[12]; /* ? */ 494 __le32 d_alt_tbl; /* byte offset of alternate table */ 495 __le32 d_alt_len; /* byte length of alternate table */ 496 __le32 d_phys_cyl; /* # of physical cylinders per device */ 497 __le32 d_phys_trk; /* # of physical tracks per cylinder */ 498 __le32 d_phys_sec; /* # of physical sectors per track */ 499 __le32 d_phys_bytes; /* # of physical bytes per sector */ 500 __le32 d_unknown2; /* ? */ 501 __le32 d_unknown3; /* ? */ 502 __le32 d_pad[8]; /* pad */ 503 504 struct unixware_vtoc { 505 __le32 v_magic; /* the magic number */ 506 __le32 v_version; /* version number */ 507 char v_name[8]; /* volume name */ 508 __le16 v_nslices; /* # of slices */ 509 __le16 v_unknown1; /* ? */ 510 __le32 v_reserved[10]; /* reserved */ 511 struct unixware_slice 512 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ 513 } vtoc; 514 515}; /* 408 */ 516 517#endif /* CONFIG_UNIXWARE_DISKLABEL */ 518 519#ifdef CONFIG_MINIX_SUBPARTITION 520# define MINIX_NR_SUBPARTITIONS 4 521#endif /* CONFIG_MINIX_SUBPARTITION */ 522 523#define ADDPART_FLAG_NONE 0 524#define ADDPART_FLAG_RAID 1 525#define ADDPART_FLAG_WHOLEDISK 2 526 527extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); 528extern void blk_free_devt(dev_t devt); 529extern dev_t blk_lookup_devt(const char *name, int partno); 530extern char *disk_name (struct gendisk *hd, int partno, char *buf); 531 532extern int disk_expand_part_tbl(struct gendisk *disk, int target); 533extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); 534extern struct hd_struct * __must_check add_partition(struct gendisk *disk, 535 int partno, sector_t start, 536 sector_t len, int flags); 537extern void delete_partition(struct gendisk *, int); 538extern void printk_all_partitions(void); 539 540extern struct gendisk *alloc_disk_node(int minors, int node_id); 541extern struct gendisk *alloc_disk(int minors); 542extern struct kobject *get_disk(struct gendisk *disk); 543extern void put_disk(struct gendisk *disk); 544extern void blk_register_region(dev_t devt, unsigned long range, 545 struct module *module, 546 struct kobject *(*probe)(dev_t, int *, void *), 547 int (*lock)(dev_t, void *), 548 void *data); 549extern void blk_unregister_region(dev_t devt, unsigned long range); 550 551extern ssize_t part_size_show(struct device *dev, 552 struct device_attribute *attr, char *buf); 553extern ssize_t part_stat_show(struct device *dev, 554 struct device_attribute *attr, char *buf); 555extern ssize_t part_inflight_show(struct device *dev, 556 struct device_attribute *attr, char *buf); 557#ifdef CONFIG_FAIL_MAKE_REQUEST 558extern ssize_t part_fail_show(struct device *dev, 559 struct device_attribute *attr, char *buf); 560extern ssize_t part_fail_store(struct device *dev, 561 struct device_attribute *attr, 562 const char *buf, size_t count); 563#endif /* CONFIG_FAIL_MAKE_REQUEST */ 564 565#else /* CONFIG_BLOCK */ 566 567static inline void printk_all_partitions(void) { } 568 569static inline dev_t blk_lookup_devt(const char *name, int partno) 570{ 571 dev_t devt = MKDEV(0, 0); 572 return devt; 573} 574 575#endif /* CONFIG_BLOCK */ 576 577#endif /* _LINUX_GENHD_H */ 578