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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 
 18 #ifdef CONFIG_BLOCK
 19 
 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))
 24 
 25 extern struct device_type part_type;
 26 extern struct kobject *block_depr;
 27 extern struct class block_class;
 28 
 29 enum {
 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,
 35 
 36         SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
 37 
 38         LINUX_SWAP_PARTITION = 0x82,
 39         LINUX_DATA_PARTITION = 0x83,
 40         LINUX_LVM_PARTITION = 0x8e,
 41         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
 42 
 43         SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
 44         NEW_SOLARIS_X86_PARTITION = 0xbf,
 45 
 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 */
 50 
 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 */
 57 };
 58 
 59 #define DISK_MAX_PARTS                  256
 60 #define DISK_NAME_LEN                   32
 61 
 62 #include <linux/major.h>
 63 #include <linux/device.h>
 64 #include <linux/smp.h>
 65 #include <linux/string.h>
 66 #include <linux/fs.h>
 67 #include <linux/workqueue.h>
 68 
 69 struct partition {
 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));
 81 
 82 struct disk_stats {
 83         unsigned long sectors[2];       /* READs and WRITEs */
 84         unsigned long ios[2];
 85         unsigned long merges[2];
 86         unsigned long ticks[2];
 87         unsigned long io_ticks;
 88         unsigned long time_in_queue;
 89 };
 90 
 91 #define PARTITION_META_INFO_VOLNAMELTH  64
 92 /*
 93  * Enough for the string representation of any kind of UUID plus NULL.
 94  * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
 95  */
 96 #define PARTITION_META_INFO_UUIDLTH     37
 97 
 98 struct partition_meta_info {
 99         char uuid[PARTITION_META_INFO_UUIDLTH];
100         u8 volname[PARTITION_META_INFO_VOLNAMELTH];
101 };
102 
103 struct hd_struct {
104         sector_t start_sect;
105         /*
106          * nr_sects is protected by sequence counter. One might extend a
107          * partition while IO is happening to it and update of nr_sects
108          * can be non-atomic on 32bit machines with 64bit sector_t.
109          */
110         sector_t nr_sects;
111         seqcount_t nr_sects_seq;
112         sector_t alignment_offset;
113         unsigned int discard_alignment;
114         struct device __dev;
115         struct kobject *holder_dir;
116         int policy, partno;
117         struct partition_meta_info *info;
118 #ifdef CONFIG_FAIL_MAKE_REQUEST
119         int make_it_fail;
120 #endif
121         unsigned long stamp;
122         atomic_t in_flight[2];
123 #ifdef  CONFIG_SMP
124         struct disk_stats __percpu *dkstats;
125 #else
126         struct disk_stats dkstats;
127 #endif
128         struct percpu_ref ref;
129         struct rcu_head rcu_head;
130 };
131 
132 #define GENHD_FL_REMOVABLE                      1
133 /* 2 is unused */
134 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
135 #define GENHD_FL_CD                             8
136 #define GENHD_FL_UP                             16
137 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
138 #define GENHD_FL_EXT_DEVT                       64 /* allow extended devt */
139 #define GENHD_FL_NATIVE_CAPACITY                128
140 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE     256
141 #define GENHD_FL_NO_PART_SCAN                   512
142 
143 enum {
144         DISK_EVENT_MEDIA_CHANGE                 = 1 << 0, /* media changed */
145         DISK_EVENT_EJECT_REQUEST                = 1 << 1, /* eject requested */
146 };
147 
148 #define BLK_SCSI_MAX_CMDS       (256)
149 #define BLK_SCSI_CMD_PER_LONG   (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
150 
151 struct blk_scsi_cmd_filter {
152         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
153         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
154         struct kobject kobj;
155 };
156 
157 struct disk_part_tbl {
158         struct rcu_head rcu_head;
159         int len;
160         struct hd_struct __rcu *last_lookup;
161         struct hd_struct __rcu *part[];
162 };
163 
164 struct disk_events;
165 
166 struct gendisk {
167         /* major, first_minor and minors are input parameters only,
168          * don't use directly.  Use disk_devt() and disk_max_parts().
169          */
170         int major;                      /* major number of driver */
171         int first_minor;
172         int minors;                     /* maximum number of minors, =1 for
173                                          * disks that can't be partitioned. */
174 
175         char disk_name[DISK_NAME_LEN];  /* name of major driver */
176         char *(*devnode)(struct gendisk *gd, umode_t *mode);
177 
178         unsigned int events;            /* supported events */
179         unsigned int async_events;      /* async events, subset of all */
180 
181         /* Array of pointers to partitions indexed by partno.
182          * Protected with matching bdev lock but stat and other
183          * non-critical accesses use RCU.  Always access through
184          * helpers.
185          */
186         struct disk_part_tbl __rcu *part_tbl;
187         struct hd_struct part0;
188 
189         const struct block_device_operations *fops;
190         struct request_queue *queue;
191         void *private_data;
192 
193         int flags;
194         struct device *driverfs_dev;  // FIXME: remove
195         struct kobject *slave_dir;
196 
197         struct timer_rand_state *random;
198         atomic_t sync_io;               /* RAID */
199         struct disk_events *ev;
200 #ifdef  CONFIG_BLK_DEV_INTEGRITY
201         struct blk_integrity *integrity;
202 #endif
203         int node_id;
204 };
205 
206 static inline struct gendisk *part_to_disk(struct hd_struct *part)
207 {
208         if (likely(part)) {
209                 if (part->partno)
210                         return dev_to_disk(part_to_dev(part)->parent);
211                 else
212                         return dev_to_disk(part_to_dev(part));
213         }
214         return NULL;
215 }
216 
217 static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
218 {
219         int i;
220         for (i = 0; i < 16; ++i) {
221                 *to++ = (hex_to_bin(*uuid_str) << 4) |
222                         (hex_to_bin(*(uuid_str + 1)));
223                 uuid_str += 2;
224                 switch (i) {
225                 case 3:
226                 case 5:
227                 case 7:
228                 case 9:
229                         uuid_str++;
230                         continue;
231                 }
232         }
233 }
234 
235 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
236 {
237         part_pack_uuid(uuid_str, to);
238         return 0;
239 }
240 
241 static inline int disk_max_parts(struct gendisk *disk)
242 {
243         if (disk->flags & GENHD_FL_EXT_DEVT)
244                 return DISK_MAX_PARTS;
245         return disk->minors;
246 }
247 
248 static inline bool disk_part_scan_enabled(struct gendisk *disk)
249 {
250         return disk_max_parts(disk) > 1 &&
251                 !(disk->flags & GENHD_FL_NO_PART_SCAN);
252 }
253 
254 static inline dev_t disk_devt(struct gendisk *disk)
255 {
256         return disk_to_dev(disk)->devt;
257 }
258 
259 static inline dev_t part_devt(struct hd_struct *part)
260 {
261         return part_to_dev(part)->devt;
262 }
263 
264 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
265 
266 static inline void disk_put_part(struct hd_struct *part)
267 {
268         if (likely(part))
269                 put_device(part_to_dev(part));
270 }
271 
272 /*
273  * Smarter partition iterator without context limits.
274  */
275 #define DISK_PITER_REVERSE      (1 << 0) /* iterate in the reverse direction */
276 #define DISK_PITER_INCL_EMPTY   (1 << 1) /* include 0-sized parts */
277 #define DISK_PITER_INCL_PART0   (1 << 2) /* include partition 0 */
278 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
279 
280 struct disk_part_iter {
281         struct gendisk          *disk;
282         struct hd_struct        *part;
283         int                     idx;
284         unsigned int            flags;
285 };
286 
287 extern void disk_part_iter_init(struct disk_part_iter *piter,
288                                  struct gendisk *disk, unsigned int flags);
289 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
290 extern void disk_part_iter_exit(struct disk_part_iter *piter);
291 
292 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
293                                              sector_t sector);
294 
295 /*
296  * Macros to operate on percpu disk statistics:
297  *
298  * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
299  * and should be called between disk_stat_lock() and
300  * disk_stat_unlock().
301  *
302  * part_stat_read() can be called at any time.
303  *
304  * part_stat_{add|set_all}() and {init|free}_part_stats are for
305  * internal use only.
306  */
307 #ifdef  CONFIG_SMP
308 #define part_stat_lock()        ({ rcu_read_lock(); get_cpu(); })
309 #define part_stat_unlock()      do { put_cpu(); rcu_read_unlock(); } while (0)
310 
311 #define __part_stat_add(cpu, part, field, addnd)                        \
312         (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
313 
314 #define part_stat_read(part, field)                                     \
315 ({                                                                      \
316         typeof((part)->dkstats->field) res = 0;                         \
317         unsigned int _cpu;                                              \
318         for_each_possible_cpu(_cpu)                                     \
319                 res += per_cpu_ptr((part)->dkstats, _cpu)->field;       \
320         res;                                                            \
321 })
322 
323 static inline void part_stat_set_all(struct hd_struct *part, int value)
324 {
325         int i;
326 
327         for_each_possible_cpu(i)
328                 memset(per_cpu_ptr(part->dkstats, i), value,
329                                 sizeof(struct disk_stats));
330 }
331 
332 static inline int init_part_stats(struct hd_struct *part)
333 {
334         part->dkstats = alloc_percpu(struct disk_stats);
335         if (!part->dkstats)
336                 return 0;
337         return 1;
338 }
339 
340 static inline void free_part_stats(struct hd_struct *part)
341 {
342         free_percpu(part->dkstats);
343 }
344 
345 #else /* !CONFIG_SMP */
346 #define part_stat_lock()        ({ rcu_read_lock(); 0; })
347 #define part_stat_unlock()      rcu_read_unlock()
348 
349 #define __part_stat_add(cpu, part, field, addnd)                                \
350         ((part)->dkstats.field += addnd)
351 
352 #define part_stat_read(part, field)     ((part)->dkstats.field)
353 
354 static inline void part_stat_set_all(struct hd_struct *part, int value)
355 {
356         memset(&part->dkstats, value, sizeof(struct disk_stats));
357 }
358 
359 static inline int init_part_stats(struct hd_struct *part)
360 {
361         return 1;
362 }
363 
364 static inline void free_part_stats(struct hd_struct *part)
365 {
366 }
367 
368 #endif /* CONFIG_SMP */
369 
370 #define part_stat_add(cpu, part, field, addnd)  do {                    \
371         __part_stat_add((cpu), (part), field, addnd);                   \
372         if ((part)->partno)                                             \
373                 __part_stat_add((cpu), &part_to_disk((part))->part0,    \
374                                 field, addnd);                          \
375 } while (0)
376 
377 #define part_stat_dec(cpu, gendiskp, field)                             \
378         part_stat_add(cpu, gendiskp, field, -1)
379 #define part_stat_inc(cpu, gendiskp, field)                             \
380         part_stat_add(cpu, gendiskp, field, 1)
381 #define part_stat_sub(cpu, gendiskp, field, subnd)                      \
382         part_stat_add(cpu, gendiskp, field, -subnd)
383 
384 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
385 {
386         atomic_inc(&part->in_flight[rw]);
387         if (part->partno)
388                 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
389 }
390 
391 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
392 {
393         atomic_dec(&part->in_flight[rw]);
394         if (part->partno)
395                 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
396 }
397 
398 static inline int part_in_flight(struct hd_struct *part)
399 {
400         return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
401 }
402 
403 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
404 {
405         if (disk)
406                 return kzalloc_node(sizeof(struct partition_meta_info),
407                                     GFP_KERNEL, disk->node_id);
408         return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
409 }
410 
411 static inline void free_part_info(struct hd_struct *part)
412 {
413         kfree(part->info);
414 }
415 
416 /* block/blk-core.c */
417 extern void part_round_stats(int cpu, struct hd_struct *part);
418 
419 /* block/genhd.c */
420 extern void add_disk(struct gendisk *disk);
421 extern void del_gendisk(struct gendisk *gp);
422 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
423 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
424 
425 extern void set_device_ro(struct block_device *bdev, int flag);
426 extern void set_disk_ro(struct gendisk *disk, int flag);
427 
428 static inline int get_disk_ro(struct gendisk *disk)
429 {
430         return disk->part0.policy;
431 }
432 
433 extern void disk_block_events(struct gendisk *disk);
434 extern void disk_unblock_events(struct gendisk *disk);
435 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
436 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
437 
438 /* drivers/char/random.c */
439 extern void add_disk_randomness(struct gendisk *disk);
440 extern void rand_initialize_disk(struct gendisk *disk);
441 
442 static inline sector_t get_start_sect(struct block_device *bdev)
443 {
444         return bdev->bd_part->start_sect;
445 }
446 static inline sector_t get_capacity(struct gendisk *disk)
447 {
448         return disk->part0.nr_sects;
449 }
450 static inline void set_capacity(struct gendisk *disk, sector_t size)
451 {
452         disk->part0.nr_sects = size;
453 }
454 
455 #ifdef CONFIG_SOLARIS_X86_PARTITION
456 
457 #define SOLARIS_X86_NUMSLICE    16
458 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
459 
460 struct solaris_x86_slice {
461         __le16 s_tag;           /* ID tag of partition */
462         __le16 s_flag;          /* permission flags */
463         __le32 s_start;         /* start sector no of partition */
464         __le32 s_size;          /* # of blocks in partition */
465 };
466 
467 struct solaris_x86_vtoc {
468         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
469         __le32 v_sanity;                /* to verify vtoc sanity */
470         __le32 v_version;               /* layout version */
471         char    v_volume[8];            /* volume name */
472         __le16  v_sectorsz;             /* sector size in bytes */
473         __le16  v_nparts;               /* number of partitions */
474         unsigned int v_reserved[10];    /* free space */
475         struct solaris_x86_slice
476                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
477         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
478         char    v_asciilabel[128];      /* for compatibility */
479 };
480 
481 #endif /* CONFIG_SOLARIS_X86_PARTITION */
482 
483 #ifdef CONFIG_BSD_DISKLABEL
484 /*
485  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
486  * updated by Marc Espie <Marc.Espie@openbsd.org>
487  */
488 
489 /* check against BSD src/sys/sys/disklabel.h for consistency */
490 
491 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
492 #define BSD_MAXPARTITIONS       16
493 #define OPENBSD_MAXPARTITIONS   16
494 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
495 struct bsd_disklabel {
496         __le32  d_magic;                /* the magic number */
497         __s16   d_type;                 /* drive type */
498         __s16   d_subtype;              /* controller/d_type specific */
499         char    d_typename[16];         /* type name, e.g. "eagle" */
500         char    d_packname[16];                 /* pack identifier */ 
501         __u32   d_secsize;              /* # of bytes per sector */
502         __u32   d_nsectors;             /* # of data sectors per track */
503         __u32   d_ntracks;              /* # of tracks per cylinder */
504         __u32   d_ncylinders;           /* # of data cylinders per unit */
505         __u32   d_secpercyl;            /* # of data sectors per cylinder */
506         __u32   d_secperunit;           /* # of data sectors per unit */
507         __u16   d_sparespertrack;       /* # of spare sectors per track */
508         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
509         __u32   d_acylinders;           /* # of alt. cylinders per unit */
510         __u16   d_rpm;                  /* rotational speed */
511         __u16   d_interleave;           /* hardware sector interleave */
512         __u16   d_trackskew;            /* sector 0 skew, per track */
513         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
514         __u32   d_headswitch;           /* head switch time, usec */
515         __u32   d_trkseek;              /* track-to-track seek, usec */
516         __u32   d_flags;                /* generic flags */
517 #define NDDATA 5
518         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
519 #define NSPARE 5
520         __u32   d_spare[NSPARE];        /* reserved for future use */
521         __le32  d_magic2;               /* the magic number (again) */
522         __le16  d_checksum;             /* xor of data incl. partitions */
523 
524                         /* filesystem and partition information: */
525         __le16  d_npartitions;          /* number of partitions in following */
526         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
527         __le32  d_sbsize;               /* max size of fs superblock, bytes */
528         struct  bsd_partition {         /* the partition table */
529                 __le32  p_size;         /* number of sectors in partition */
530                 __le32  p_offset;       /* starting sector */
531                 __le32  p_fsize;        /* filesystem basic fragment size */
532                 __u8    p_fstype;       /* filesystem type, see below */
533                 __u8    p_frag;         /* filesystem fragments per block */
534                 __le16  p_cpg;          /* filesystem cylinders per group */
535         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
536 };
537 
538 #endif  /* CONFIG_BSD_DISKLABEL */
539 
540 #ifdef CONFIG_UNIXWARE_DISKLABEL
541 /*
542  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
543  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
544  */
545 
546 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
547 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
548 #define UNIXWARE_NUMSLICE      16
549 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
550 
551 struct unixware_slice {
552         __le16   s_label;       /* label */
553         __le16   s_flags;       /* permission flags */
554         __le32   start_sect;    /* starting sector */
555         __le32   nr_sects;      /* number of sectors in slice */
556 };
557 
558 struct unixware_disklabel {
559         __le32   d_type;                /* drive type */
560         __le32   d_magic;                /* the magic number */
561         __le32   d_version;              /* version number */
562         char    d_serial[12];           /* serial number of the device */
563         __le32   d_ncylinders;           /* # of data cylinders per device */
564         __le32   d_ntracks;              /* # of tracks per cylinder */
565         __le32   d_nsectors;             /* # of data sectors per track */
566         __le32   d_secsize;              /* # of bytes per sector */
567         __le32   d_part_start;           /* # of first sector of this partition */
568         __le32   d_unknown1[12];         /* ? */
569         __le32  d_alt_tbl;              /* byte offset of alternate table */
570         __le32  d_alt_len;              /* byte length of alternate table */
571         __le32  d_phys_cyl;             /* # of physical cylinders per device */
572         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
573         __le32  d_phys_sec;             /* # of physical sectors per track */
574         __le32  d_phys_bytes;           /* # of physical bytes per sector */
575         __le32  d_unknown2;             /* ? */
576         __le32   d_unknown3;             /* ? */
577         __le32  d_pad[8];               /* pad */
578 
579         struct unixware_vtoc {
580                 __le32  v_magic;                /* the magic number */
581                 __le32  v_version;              /* version number */
582                 char    v_name[8];              /* volume name */
583                 __le16  v_nslices;              /* # of slices */
584                 __le16  v_unknown1;             /* ? */
585                 __le32  v_reserved[10];         /* reserved */
586                 struct unixware_slice
587                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
588         } vtoc;
589 
590 };  /* 408 */
591 
592 #endif /* CONFIG_UNIXWARE_DISKLABEL */
593 
594 #ifdef CONFIG_MINIX_SUBPARTITION
595 #   define MINIX_NR_SUBPARTITIONS  4
596 #endif /* CONFIG_MINIX_SUBPARTITION */
597 
598 #define ADDPART_FLAG_NONE       0
599 #define ADDPART_FLAG_RAID       1
600 #define ADDPART_FLAG_WHOLEDISK  2
601 
602 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
603 extern void blk_free_devt(dev_t devt);
604 extern dev_t blk_lookup_devt(const char *name, int partno);
605 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
606 
607 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
608 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
609 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
610 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
611                                                      int partno, sector_t start,
612                                                      sector_t len, int flags,
613                                                      struct partition_meta_info
614                                                        *info);
615 extern void __delete_partition(struct percpu_ref *);
616 extern void delete_partition(struct gendisk *, int);
617 extern void printk_all_partitions(void);
618 
619 extern struct gendisk *alloc_disk_node(int minors, int node_id);
620 extern struct gendisk *alloc_disk(int minors);
621 extern struct kobject *get_disk(struct gendisk *disk);
622 extern void put_disk(struct gendisk *disk);
623 extern void blk_register_region(dev_t devt, unsigned long range,
624                         struct module *module,
625                         struct kobject *(*probe)(dev_t, int *, void *),
626                         int (*lock)(dev_t, void *),
627                         void *data);
628 extern void blk_unregister_region(dev_t devt, unsigned long range);
629 
630 extern ssize_t part_size_show(struct device *dev,
631                               struct device_attribute *attr, char *buf);
632 extern ssize_t part_stat_show(struct device *dev,
633                               struct device_attribute *attr, char *buf);
634 extern ssize_t part_inflight_show(struct device *dev,
635                               struct device_attribute *attr, char *buf);
636 #ifdef CONFIG_FAIL_MAKE_REQUEST
637 extern ssize_t part_fail_show(struct device *dev,
638                               struct device_attribute *attr, char *buf);
639 extern ssize_t part_fail_store(struct device *dev,
640                                struct device_attribute *attr,
641                                const char *buf, size_t count);
642 #endif /* CONFIG_FAIL_MAKE_REQUEST */
643 
644 static inline int hd_ref_init(struct hd_struct *part)
645 {
646         if (percpu_ref_init(&part->ref, __delete_partition, 0,
647                                 GFP_KERNEL))
648                 return -ENOMEM;
649         return 0;
650 }
651 
652 static inline void hd_struct_get(struct hd_struct *part)
653 {
654         percpu_ref_get(&part->ref);
655 }
656 
657 static inline int hd_struct_try_get(struct hd_struct *part)
658 {
659         return percpu_ref_tryget_live(&part->ref);
660 }
661 
662 static inline void hd_struct_put(struct hd_struct *part)
663 {
664         percpu_ref_put(&part->ref);
665 }
666 
667 static inline void hd_struct_kill(struct hd_struct *part)
668 {
669         percpu_ref_kill(&part->ref);
670 }
671 
672 static inline void hd_free_part(struct hd_struct *part)
673 {
674         free_part_stats(part);
675         free_part_info(part);
676         percpu_ref_exit(&part->ref);
677 }
678 
679 /*
680  * Any access of part->nr_sects which is not protected by partition
681  * bd_mutex or gendisk bdev bd_mutex, should be done using this
682  * accessor function.
683  *
684  * Code written along the lines of i_size_read() and i_size_write().
685  * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
686  * on.
687  */
688 static inline sector_t part_nr_sects_read(struct hd_struct *part)
689 {
690 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
691         sector_t nr_sects;
692         unsigned seq;
693         do {
694                 seq = read_seqcount_begin(&part->nr_sects_seq);
695                 nr_sects = part->nr_sects;
696         } while (read_seqcount_retry(&part->nr_sects_seq, seq));
697         return nr_sects;
698 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
699         sector_t nr_sects;
700 
701         preempt_disable();
702         nr_sects = part->nr_sects;
703         preempt_enable();
704         return nr_sects;
705 #else
706         return part->nr_sects;
707 #endif
708 }
709 
710 /*
711  * Should be called with mutex lock held (typically bd_mutex) of partition
712  * to provide mutual exlusion among writers otherwise seqcount might be
713  * left in wrong state leaving the readers spinning infinitely.
714  */
715 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
716 {
717 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
718         write_seqcount_begin(&part->nr_sects_seq);
719         part->nr_sects = size;
720         write_seqcount_end(&part->nr_sects_seq);
721 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
722         preempt_disable();
723         part->nr_sects = size;
724         preempt_enable();
725 #else
726         part->nr_sects = size;
727 #endif
728 }
729 
730 #else /* CONFIG_BLOCK */
731 
732 static inline void printk_all_partitions(void) { }
733 
734 static inline dev_t blk_lookup_devt(const char *name, int partno)
735 {
736         dev_t devt = MKDEV(0, 0);
737         return devt;
738 }
739 
740 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
741 {
742         return -EINVAL;
743 }
744 #endif /* CONFIG_BLOCK */
745 
746 #endif /* _LINUX_GENHD_H */
747 

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