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

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