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TOMOYO Linux Cross Reference
Linux/include/linux/genhd.h

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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 #include <linux/rcupdate.h>
 15 #include <linux/slab.h>
 16 #include <linux/percpu-refcount.h>
 17 #include <linux/uuid.h>
 18 
 19 #ifdef CONFIG_BLOCK
 20 
 21 #define dev_to_disk(device)     container_of((device), struct gendisk, part0.__dev)
 22 #define dev_to_part(device)     container_of((device), struct hd_struct, __dev)
 23 #define disk_to_dev(disk)       (&(disk)->part0.__dev)
 24 #define part_to_dev(part)       (&((part)->__dev))
 25 
 26 extern struct device_type part_type;
 27 extern struct kobject *block_depr;
 28 extern struct class block_class;
 29 
 30 enum {
 31 /* These three have identical behaviour; use the second one if DOS FDISK gets
 32    confused about extended/logical partitions starting past cylinder 1023. */
 33         DOS_EXTENDED_PARTITION = 5,
 34         LINUX_EXTENDED_PARTITION = 0x85,
 35         WIN98_EXTENDED_PARTITION = 0x0f,
 36 
 37         SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
 38 
 39         LINUX_SWAP_PARTITION = 0x82,
 40         LINUX_DATA_PARTITION = 0x83,
 41         LINUX_LVM_PARTITION = 0x8e,
 42         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
 43 
 44         SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
 45         NEW_SOLARIS_X86_PARTITION = 0xbf,
 46 
 47         DM6_AUX1PARTITION = 0x51,       /* no DDO:  use xlated geom */
 48         DM6_AUX3PARTITION = 0x53,       /* no DDO:  use xlated geom */
 49         DM6_PARTITION = 0x54,           /* has DDO: use xlated geom & offset */
 50         EZD_PARTITION = 0x55,           /* EZ-DRIVE */
 51 
 52         FREEBSD_PARTITION = 0xa5,       /* FreeBSD Partition ID */
 53         OPENBSD_PARTITION = 0xa6,       /* OpenBSD Partition ID */
 54         NETBSD_PARTITION = 0xa9,        /* NetBSD Partition ID */
 55         BSDI_PARTITION = 0xb7,          /* BSDI Partition ID */
 56         MINIX_PARTITION = 0x81,         /* Minix Partition ID */
 57         UNIXWARE_PARTITION = 0x63,      /* Same as GNU_HURD and SCO Unix */
 58 };
 59 
 60 #define DISK_MAX_PARTS                  256
 61 #define DISK_NAME_LEN                   32
 62 
 63 #include <linux/major.h>
 64 #include <linux/device.h>
 65 #include <linux/smp.h>
 66 #include <linux/string.h>
 67 #include <linux/fs.h>
 68 #include <linux/workqueue.h>
 69 
 70 struct partition {
 71         unsigned char boot_ind;         /* 0x80 - active */
 72         unsigned char head;             /* starting head */
 73         unsigned char sector;           /* starting sector */
 74         unsigned char cyl;              /* starting cylinder */
 75         unsigned char sys_ind;          /* What partition type */
 76         unsigned char end_head;         /* end head */
 77         unsigned char end_sector;       /* end sector */
 78         unsigned char end_cyl;          /* end cylinder */
 79         __le32 start_sect;      /* starting sector counting from 0 */
 80         __le32 nr_sects;                /* nr of sectors in partition */
 81 } __attribute__((packed));
 82 
 83 struct disk_stats {
 84         unsigned long sectors[2];       /* READs and WRITEs */
 85         unsigned long ios[2];
 86         unsigned long merges[2];
 87         unsigned long ticks[2];
 88         unsigned long io_ticks;
 89         unsigned long time_in_queue;
 90 };
 91 
 92 #define PARTITION_META_INFO_VOLNAMELTH  64
 93 /*
 94  * Enough for the string representation of any kind of UUID plus NULL.
 95  * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
 96  */
 97 #define PARTITION_META_INFO_UUIDLTH     (UUID_STRING_LEN + 1)
 98 
 99 struct partition_meta_info {
100         char uuid[PARTITION_META_INFO_UUIDLTH];
101         u8 volname[PARTITION_META_INFO_VOLNAMELTH];
102 };
103 
104 struct hd_struct {
105         sector_t start_sect;
106         /*
107          * nr_sects is protected by sequence counter. One might extend a
108          * partition while IO is happening to it and update of nr_sects
109          * can be non-atomic on 32bit machines with 64bit sector_t.
110          */
111         sector_t nr_sects;
112         seqcount_t nr_sects_seq;
113         sector_t alignment_offset;
114         unsigned int discard_alignment;
115         struct device __dev;
116         struct kobject *holder_dir;
117         int policy, partno;
118         struct partition_meta_info *info;
119 #ifdef CONFIG_FAIL_MAKE_REQUEST
120         int make_it_fail;
121 #endif
122         unsigned long stamp;
123         atomic_t in_flight[2];
124 #ifdef  CONFIG_SMP
125         struct disk_stats __percpu *dkstats;
126 #else
127         struct disk_stats dkstats;
128 #endif
129         struct percpu_ref ref;
130         struct rcu_head rcu_head;
131 };
132 
133 #define GENHD_FL_REMOVABLE                      1
134 /* 2 is unused */
135 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
136 #define GENHD_FL_CD                             8
137 #define GENHD_FL_UP                             16
138 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
139 #define GENHD_FL_EXT_DEVT                       64 /* allow extended devt */
140 #define GENHD_FL_NATIVE_CAPACITY                128
141 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE     256
142 #define GENHD_FL_NO_PART_SCAN                   512
143 
144 enum {
145         DISK_EVENT_MEDIA_CHANGE                 = 1 << 0, /* media changed */
146         DISK_EVENT_EJECT_REQUEST                = 1 << 1, /* eject requested */
147 };
148 
149 struct disk_part_tbl {
150         struct rcu_head rcu_head;
151         int len;
152         struct hd_struct __rcu *last_lookup;
153         struct hd_struct __rcu *part[];
154 };
155 
156 struct disk_events;
157 struct badblocks;
158 
159 #if defined(CONFIG_BLK_DEV_INTEGRITY)
160 
161 struct blk_integrity {
162         const struct blk_integrity_profile      *profile;
163         unsigned char                           flags;
164         unsigned char                           tuple_size;
165         unsigned char                           interval_exp;
166         unsigned char                           tag_size;
167 };
168 
169 #endif  /* CONFIG_BLK_DEV_INTEGRITY */
170 
171 struct gendisk {
172         /* major, first_minor and minors are input parameters only,
173          * don't use directly.  Use disk_devt() and disk_max_parts().
174          */
175         int major;                      /* major number of driver */
176         int first_minor;
177         int minors;                     /* maximum number of minors, =1 for
178                                          * disks that can't be partitioned. */
179 
180         char disk_name[DISK_NAME_LEN];  /* name of major driver */
181         char *(*devnode)(struct gendisk *gd, umode_t *mode);
182 
183         unsigned int events;            /* supported events */
184         unsigned int async_events;      /* async events, subset of all */
185 
186         /* Array of pointers to partitions indexed by partno.
187          * Protected with matching bdev lock but stat and other
188          * non-critical accesses use RCU.  Always access through
189          * helpers.
190          */
191         struct disk_part_tbl __rcu *part_tbl;
192         struct hd_struct part0;
193 
194         const struct block_device_operations *fops;
195         struct request_queue *queue;
196         void *private_data;
197 
198         int flags;
199         struct kobject *slave_dir;
200 
201         struct timer_rand_state *random;
202         atomic_t sync_io;               /* RAID */
203         struct disk_events *ev;
204 #ifdef  CONFIG_BLK_DEV_INTEGRITY
205         struct kobject integrity_kobj;
206 #endif  /* CONFIG_BLK_DEV_INTEGRITY */
207         int node_id;
208         struct badblocks *bb;
209 };
210 
211 static inline struct gendisk *part_to_disk(struct hd_struct *part)
212 {
213         if (likely(part)) {
214                 if (part->partno)
215                         return dev_to_disk(part_to_dev(part)->parent);
216                 else
217                         return dev_to_disk(part_to_dev(part));
218         }
219         return NULL;
220 }
221 
222 static inline int disk_max_parts(struct gendisk *disk)
223 {
224         if (disk->flags & GENHD_FL_EXT_DEVT)
225                 return DISK_MAX_PARTS;
226         return disk->minors;
227 }
228 
229 static inline bool disk_part_scan_enabled(struct gendisk *disk)
230 {
231         return disk_max_parts(disk) > 1 &&
232                 !(disk->flags & GENHD_FL_NO_PART_SCAN);
233 }
234 
235 static inline dev_t disk_devt(struct gendisk *disk)
236 {
237         return disk_to_dev(disk)->devt;
238 }
239 
240 static inline dev_t part_devt(struct hd_struct *part)
241 {
242         return part_to_dev(part)->devt;
243 }
244 
245 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
246 
247 static inline void disk_put_part(struct hd_struct *part)
248 {
249         if (likely(part))
250                 put_device(part_to_dev(part));
251 }
252 
253 /*
254  * Smarter partition iterator without context limits.
255  */
256 #define DISK_PITER_REVERSE      (1 << 0) /* iterate in the reverse direction */
257 #define DISK_PITER_INCL_EMPTY   (1 << 1) /* include 0-sized parts */
258 #define DISK_PITER_INCL_PART0   (1 << 2) /* include partition 0 */
259 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
260 
261 struct disk_part_iter {
262         struct gendisk          *disk;
263         struct hd_struct        *part;
264         int                     idx;
265         unsigned int            flags;
266 };
267 
268 extern void disk_part_iter_init(struct disk_part_iter *piter,
269                                  struct gendisk *disk, unsigned int flags);
270 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
271 extern void disk_part_iter_exit(struct disk_part_iter *piter);
272 
273 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
274                                              sector_t sector);
275 
276 /*
277  * Macros to operate on percpu disk statistics:
278  *
279  * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
280  * and should be called between disk_stat_lock() and
281  * disk_stat_unlock().
282  *
283  * part_stat_read() can be called at any time.
284  *
285  * part_stat_{add|set_all}() and {init|free}_part_stats are for
286  * internal use only.
287  */
288 #ifdef  CONFIG_SMP
289 #define part_stat_lock()        ({ rcu_read_lock(); get_cpu(); })
290 #define part_stat_unlock()      do { put_cpu(); rcu_read_unlock(); } while (0)
291 
292 #define __part_stat_add(cpu, part, field, addnd)                        \
293         (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
294 
295 #define part_stat_read(part, field)                                     \
296 ({                                                                      \
297         typeof((part)->dkstats->field) res = 0;                         \
298         unsigned int _cpu;                                              \
299         for_each_possible_cpu(_cpu)                                     \
300                 res += per_cpu_ptr((part)->dkstats, _cpu)->field;       \
301         res;                                                            \
302 })
303 
304 static inline void part_stat_set_all(struct hd_struct *part, int value)
305 {
306         int i;
307 
308         for_each_possible_cpu(i)
309                 memset(per_cpu_ptr(part->dkstats, i), value,
310                                 sizeof(struct disk_stats));
311 }
312 
313 static inline int init_part_stats(struct hd_struct *part)
314 {
315         part->dkstats = alloc_percpu(struct disk_stats);
316         if (!part->dkstats)
317                 return 0;
318         return 1;
319 }
320 
321 static inline void free_part_stats(struct hd_struct *part)
322 {
323         free_percpu(part->dkstats);
324 }
325 
326 #else /* !CONFIG_SMP */
327 #define part_stat_lock()        ({ rcu_read_lock(); 0; })
328 #define part_stat_unlock()      rcu_read_unlock()
329 
330 #define __part_stat_add(cpu, part, field, addnd)                                \
331         ((part)->dkstats.field += addnd)
332 
333 #define part_stat_read(part, field)     ((part)->dkstats.field)
334 
335 static inline void part_stat_set_all(struct hd_struct *part, int value)
336 {
337         memset(&part->dkstats, value, sizeof(struct disk_stats));
338 }
339 
340 static inline int init_part_stats(struct hd_struct *part)
341 {
342         return 1;
343 }
344 
345 static inline void free_part_stats(struct hd_struct *part)
346 {
347 }
348 
349 #endif /* CONFIG_SMP */
350 
351 #define part_stat_add(cpu, part, field, addnd)  do {                    \
352         __part_stat_add((cpu), (part), field, addnd);                   \
353         if ((part)->partno)                                             \
354                 __part_stat_add((cpu), &part_to_disk((part))->part0,    \
355                                 field, addnd);                          \
356 } while (0)
357 
358 #define part_stat_dec(cpu, gendiskp, field)                             \
359         part_stat_add(cpu, gendiskp, field, -1)
360 #define part_stat_inc(cpu, gendiskp, field)                             \
361         part_stat_add(cpu, gendiskp, field, 1)
362 #define part_stat_sub(cpu, gendiskp, field, subnd)                      \
363         part_stat_add(cpu, gendiskp, field, -subnd)
364 
365 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
366 {
367         atomic_inc(&part->in_flight[rw]);
368         if (part->partno)
369                 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
370 }
371 
372 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
373 {
374         atomic_dec(&part->in_flight[rw]);
375         if (part->partno)
376                 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
377 }
378 
379 static inline int part_in_flight(struct hd_struct *part)
380 {
381         return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
382 }
383 
384 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
385 {
386         if (disk)
387                 return kzalloc_node(sizeof(struct partition_meta_info),
388                                     GFP_KERNEL, disk->node_id);
389         return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
390 }
391 
392 static inline void free_part_info(struct hd_struct *part)
393 {
394         kfree(part->info);
395 }
396 
397 /* block/blk-core.c */
398 extern void part_round_stats(int cpu, struct hd_struct *part);
399 
400 /* block/genhd.c */
401 extern void device_add_disk(struct device *parent, struct gendisk *disk);
402 static inline void add_disk(struct gendisk *disk)
403 {
404         device_add_disk(NULL, disk);
405 }
406 
407 extern void del_gendisk(struct gendisk *gp);
408 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
409 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
410 
411 extern void set_device_ro(struct block_device *bdev, int flag);
412 extern void set_disk_ro(struct gendisk *disk, int flag);
413 
414 static inline int get_disk_ro(struct gendisk *disk)
415 {
416         return disk->part0.policy;
417 }
418 
419 extern void disk_block_events(struct gendisk *disk);
420 extern void disk_unblock_events(struct gendisk *disk);
421 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
422 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
423 
424 /* drivers/char/random.c */
425 extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
426 extern void rand_initialize_disk(struct gendisk *disk);
427 
428 static inline sector_t get_start_sect(struct block_device *bdev)
429 {
430         return bdev->bd_part->start_sect;
431 }
432 static inline sector_t get_capacity(struct gendisk *disk)
433 {
434         return disk->part0.nr_sects;
435 }
436 static inline void set_capacity(struct gendisk *disk, sector_t size)
437 {
438         disk->part0.nr_sects = size;
439 }
440 
441 #ifdef CONFIG_SOLARIS_X86_PARTITION
442 
443 #define SOLARIS_X86_NUMSLICE    16
444 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
445 
446 struct solaris_x86_slice {
447         __le16 s_tag;           /* ID tag of partition */
448         __le16 s_flag;          /* permission flags */
449         __le32 s_start;         /* start sector no of partition */
450         __le32 s_size;          /* # of blocks in partition */
451 };
452 
453 struct solaris_x86_vtoc {
454         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
455         __le32 v_sanity;                /* to verify vtoc sanity */
456         __le32 v_version;               /* layout version */
457         char    v_volume[8];            /* volume name */
458         __le16  v_sectorsz;             /* sector size in bytes */
459         __le16  v_nparts;               /* number of partitions */
460         unsigned int v_reserved[10];    /* free space */
461         struct solaris_x86_slice
462                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
463         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
464         char    v_asciilabel[128];      /* for compatibility */
465 };
466 
467 #endif /* CONFIG_SOLARIS_X86_PARTITION */
468 
469 #ifdef CONFIG_BSD_DISKLABEL
470 /*
471  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
472  * updated by Marc Espie <Marc.Espie@openbsd.org>
473  */
474 
475 /* check against BSD src/sys/sys/disklabel.h for consistency */
476 
477 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
478 #define BSD_MAXPARTITIONS       16
479 #define OPENBSD_MAXPARTITIONS   16
480 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
481 struct bsd_disklabel {
482         __le32  d_magic;                /* the magic number */
483         __s16   d_type;                 /* drive type */
484         __s16   d_subtype;              /* controller/d_type specific */
485         char    d_typename[16];         /* type name, e.g. "eagle" */
486         char    d_packname[16];                 /* pack identifier */ 
487         __u32   d_secsize;              /* # of bytes per sector */
488         __u32   d_nsectors;             /* # of data sectors per track */
489         __u32   d_ntracks;              /* # of tracks per cylinder */
490         __u32   d_ncylinders;           /* # of data cylinders per unit */
491         __u32   d_secpercyl;            /* # of data sectors per cylinder */
492         __u32   d_secperunit;           /* # of data sectors per unit */
493         __u16   d_sparespertrack;       /* # of spare sectors per track */
494         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
495         __u32   d_acylinders;           /* # of alt. cylinders per unit */
496         __u16   d_rpm;                  /* rotational speed */
497         __u16   d_interleave;           /* hardware sector interleave */
498         __u16   d_trackskew;            /* sector 0 skew, per track */
499         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
500         __u32   d_headswitch;           /* head switch time, usec */
501         __u32   d_trkseek;              /* track-to-track seek, usec */
502         __u32   d_flags;                /* generic flags */
503 #define NDDATA 5
504         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
505 #define NSPARE 5
506         __u32   d_spare[NSPARE];        /* reserved for future use */
507         __le32  d_magic2;               /* the magic number (again) */
508         __le16  d_checksum;             /* xor of data incl. partitions */
509 
510                         /* filesystem and partition information: */
511         __le16  d_npartitions;          /* number of partitions in following */
512         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
513         __le32  d_sbsize;               /* max size of fs superblock, bytes */
514         struct  bsd_partition {         /* the partition table */
515                 __le32  p_size;         /* number of sectors in partition */
516                 __le32  p_offset;       /* starting sector */
517                 __le32  p_fsize;        /* filesystem basic fragment size */
518                 __u8    p_fstype;       /* filesystem type, see below */
519                 __u8    p_frag;         /* filesystem fragments per block */
520                 __le16  p_cpg;          /* filesystem cylinders per group */
521         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
522 };
523 
524 #endif  /* CONFIG_BSD_DISKLABEL */
525 
526 #ifdef CONFIG_UNIXWARE_DISKLABEL
527 /*
528  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
529  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
530  */
531 
532 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
533 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
534 #define UNIXWARE_NUMSLICE      16
535 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
536 
537 struct unixware_slice {
538         __le16   s_label;       /* label */
539         __le16   s_flags;       /* permission flags */
540         __le32   start_sect;    /* starting sector */
541         __le32   nr_sects;      /* number of sectors in slice */
542 };
543 
544 struct unixware_disklabel {
545         __le32   d_type;                /* drive type */
546         __le32   d_magic;                /* the magic number */
547         __le32   d_version;              /* version number */
548         char    d_serial[12];           /* serial number of the device */
549         __le32   d_ncylinders;           /* # of data cylinders per device */
550         __le32   d_ntracks;              /* # of tracks per cylinder */
551         __le32   d_nsectors;             /* # of data sectors per track */
552         __le32   d_secsize;              /* # of bytes per sector */
553         __le32   d_part_start;           /* # of first sector of this partition */
554         __le32   d_unknown1[12];         /* ? */
555         __le32  d_alt_tbl;              /* byte offset of alternate table */
556         __le32  d_alt_len;              /* byte length of alternate table */
557         __le32  d_phys_cyl;             /* # of physical cylinders per device */
558         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
559         __le32  d_phys_sec;             /* # of physical sectors per track */
560         __le32  d_phys_bytes;           /* # of physical bytes per sector */
561         __le32  d_unknown2;             /* ? */
562         __le32   d_unknown3;             /* ? */
563         __le32  d_pad[8];               /* pad */
564 
565         struct unixware_vtoc {
566                 __le32  v_magic;                /* the magic number */
567                 __le32  v_version;              /* version number */
568                 char    v_name[8];              /* volume name */
569                 __le16  v_nslices;              /* # of slices */
570                 __le16  v_unknown1;             /* ? */
571                 __le32  v_reserved[10];         /* reserved */
572                 struct unixware_slice
573                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
574         } vtoc;
575 
576 };  /* 408 */
577 
578 #endif /* CONFIG_UNIXWARE_DISKLABEL */
579 
580 #ifdef CONFIG_MINIX_SUBPARTITION
581 #   define MINIX_NR_SUBPARTITIONS  4
582 #endif /* CONFIG_MINIX_SUBPARTITION */
583 
584 #define ADDPART_FLAG_NONE       0
585 #define ADDPART_FLAG_RAID       1
586 #define ADDPART_FLAG_WHOLEDISK  2
587 
588 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
589 extern void blk_free_devt(dev_t devt);
590 extern dev_t blk_lookup_devt(const char *name, int partno);
591 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
592 
593 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
594 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
595 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
596 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
597                                                      int partno, sector_t start,
598                                                      sector_t len, int flags,
599                                                      struct partition_meta_info
600                                                        *info);
601 extern void __delete_partition(struct percpu_ref *);
602 extern void delete_partition(struct gendisk *, int);
603 extern void printk_all_partitions(void);
604 
605 extern struct gendisk *alloc_disk_node(int minors, int node_id);
606 extern struct gendisk *alloc_disk(int minors);
607 extern struct kobject *get_disk(struct gendisk *disk);
608 extern void put_disk(struct gendisk *disk);
609 extern void blk_register_region(dev_t devt, unsigned long range,
610                         struct module *module,
611                         struct kobject *(*probe)(dev_t, int *, void *),
612                         int (*lock)(dev_t, void *),
613                         void *data);
614 extern void blk_unregister_region(dev_t devt, unsigned long range);
615 
616 extern ssize_t part_size_show(struct device *dev,
617                               struct device_attribute *attr, char *buf);
618 extern ssize_t part_stat_show(struct device *dev,
619                               struct device_attribute *attr, char *buf);
620 extern ssize_t part_inflight_show(struct device *dev,
621                               struct device_attribute *attr, char *buf);
622 #ifdef CONFIG_FAIL_MAKE_REQUEST
623 extern ssize_t part_fail_show(struct device *dev,
624                               struct device_attribute *attr, char *buf);
625 extern ssize_t part_fail_store(struct device *dev,
626                                struct device_attribute *attr,
627                                const char *buf, size_t count);
628 #endif /* CONFIG_FAIL_MAKE_REQUEST */
629 
630 static inline int hd_ref_init(struct hd_struct *part)
631 {
632         if (percpu_ref_init(&part->ref, __delete_partition, 0,
633                                 GFP_KERNEL))
634                 return -ENOMEM;
635         return 0;
636 }
637 
638 static inline void hd_struct_get(struct hd_struct *part)
639 {
640         percpu_ref_get(&part->ref);
641 }
642 
643 static inline int hd_struct_try_get(struct hd_struct *part)
644 {
645         return percpu_ref_tryget_live(&part->ref);
646 }
647 
648 static inline void hd_struct_put(struct hd_struct *part)
649 {
650         percpu_ref_put(&part->ref);
651 }
652 
653 static inline void hd_struct_kill(struct hd_struct *part)
654 {
655         percpu_ref_kill(&part->ref);
656 }
657 
658 static inline void hd_free_part(struct hd_struct *part)
659 {
660         free_part_stats(part);
661         free_part_info(part);
662         percpu_ref_exit(&part->ref);
663 }
664 
665 /*
666  * Any access of part->nr_sects which is not protected by partition
667  * bd_mutex or gendisk bdev bd_mutex, should be done using this
668  * accessor function.
669  *
670  * Code written along the lines of i_size_read() and i_size_write().
671  * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
672  * on.
673  */
674 static inline sector_t part_nr_sects_read(struct hd_struct *part)
675 {
676 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
677         sector_t nr_sects;
678         unsigned seq;
679         do {
680                 seq = read_seqcount_begin(&part->nr_sects_seq);
681                 nr_sects = part->nr_sects;
682         } while (read_seqcount_retry(&part->nr_sects_seq, seq));
683         return nr_sects;
684 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
685         sector_t nr_sects;
686 
687         preempt_disable();
688         nr_sects = part->nr_sects;
689         preempt_enable();
690         return nr_sects;
691 #else
692         return part->nr_sects;
693 #endif
694 }
695 
696 /*
697  * Should be called with mutex lock held (typically bd_mutex) of partition
698  * to provide mutual exlusion among writers otherwise seqcount might be
699  * left in wrong state leaving the readers spinning infinitely.
700  */
701 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
702 {
703 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
704         write_seqcount_begin(&part->nr_sects_seq);
705         part->nr_sects = size;
706         write_seqcount_end(&part->nr_sects_seq);
707 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
708         preempt_disable();
709         part->nr_sects = size;
710         preempt_enable();
711 #else
712         part->nr_sects = size;
713 #endif
714 }
715 
716 #if defined(CONFIG_BLK_DEV_INTEGRITY)
717 extern void blk_integrity_add(struct gendisk *);
718 extern void blk_integrity_del(struct gendisk *);
719 #else   /* CONFIG_BLK_DEV_INTEGRITY */
720 static inline void blk_integrity_add(struct gendisk *disk) { }
721 static inline void blk_integrity_del(struct gendisk *disk) { }
722 #endif  /* CONFIG_BLK_DEV_INTEGRITY */
723 
724 #else /* CONFIG_BLOCK */
725 
726 static inline void printk_all_partitions(void) { }
727 
728 static inline dev_t blk_lookup_devt(const char *name, int partno)
729 {
730         dev_t devt = MKDEV(0, 0);
731         return devt;
732 }
733 #endif /* CONFIG_BLOCK */
734 
735 #endif /* _LINUX_GENHD_H */
736 

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