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unexport blk_rq_map_user_iov
[deliverable/linux.git] / include / linux / genhd.h
CommitLineData
1da177e4
LT		 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
1da177e4 12#include <linux/types.h>
edfaa7c3 13#include <linux/kdev_t.h>
1da177e4 14
9361401e
DH		 15#ifdef CONFIG_BLOCK
16
edfaa7c3
KS		 17#define kobj_to_dev(k) container_of(k, struct device, kobj)
18#define dev_to_disk(device) container_of(device, struct gendisk, dev)
19#define dev_to_part(device) container_of(device, struct hd_struct, dev)
20
edfaa7c3
KS		 21extern struct device_type part_type;
22extern struct kobject *block_depr;
23extern struct class block_class;
24
1da177e4
LT		 25enum {
26/* These three have identical behaviour; use the second one if DOS FDISK gets
27 confused about extended/logical partitions starting past cylinder 1023. */
28 DOS_EXTENDED_PARTITION = 5,
29 LINUX_EXTENDED_PARTITION = 0x85,
30 WIN98_EXTENDED_PARTITION = 0x0f,
31
d18d7682
FMDN		 32 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
33
1da177e4 34 LINUX_SWAP_PARTITION = 0x82,
4419d1ac
OH		 35 LINUX_DATA_PARTITION = 0x83,
36 LINUX_LVM_PARTITION = 0x8e,
1da177e4
LT		 37 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
38
39 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
40 NEW_SOLARIS_X86_PARTITION = 0xbf,
41
42 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
43 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
44 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
45 EZD_PARTITION = 0x55, /* EZ-DRIVE */
46
47 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
48 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
49 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
50 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
51 MINIX_PARTITION = 0x81, /* Minix Partition ID */
52 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
53};
54
55#ifndef __KERNEL__
56
57struct partition {
58 unsigned char boot_ind; /* 0x80 - active */
59 unsigned char head; /* starting head */
60 unsigned char sector; /* starting sector */
61 unsigned char cyl; /* starting cylinder */
62 unsigned char sys_ind; /* What partition type */
63 unsigned char end_head; /* end head */
64 unsigned char end_sector; /* end sector */
65 unsigned char end_cyl; /* end cylinder */
66 unsigned int start_sect; /* starting sector counting from 0 */
67 unsigned int nr_sects; /* nr of sectors in partition */
68} __attribute__((packed));
69
70#endif
71
72#ifdef __KERNEL__
34186efc
DW		 73#include <linux/major.h>
74#include <linux/device.h>
75#include <linux/smp.h>
76#include <linux/string.h>
77#include <linux/fs.h>
8ce7ad7b 78#include <linux/workqueue.h>
34186efc 79
1da177e4
LT		 80struct partition {
81 unsigned char boot_ind; /* 0x80 - active */
82 unsigned char head; /* starting head */
83 unsigned char sector; /* starting sector */
84 unsigned char cyl; /* starting cylinder */
85 unsigned char sys_ind; /* What partition type */
86 unsigned char end_head; /* end head */
87 unsigned char end_sector; /* end sector */
88 unsigned char end_cyl; /* end cylinder */
89 __le32 start_sect; /* starting sector counting from 0 */
90 __le32 nr_sects; /* nr of sectors in partition */
91} __attribute__((packed));
92
ea5c48ab
JM		 93struct disk_stats {
94 unsigned long sectors[2]; /* READs and WRITEs */
95 unsigned long ios[2];
96 unsigned long merges[2];
97 unsigned long ticks[2];
98 unsigned long io_ticks;
99 unsigned long time_in_queue;
100};
101
1da177e4
LT		 102struct hd_struct {
103 sector_t start_sect;
104 sector_t nr_sects;
edfaa7c3 105 struct device dev;
6a4d44c1 106 struct kobject *holder_dir;
1da177e4 107 int policy, partno;
c17bb495
AM		 108#ifdef CONFIG_FAIL_MAKE_REQUEST
109 int make_it_fail;
ea5c48ab
JM		 110#endif
111 unsigned long stamp;
112 int in_flight;
113#ifdef CONFIG_SMP
114 struct disk_stats *dkstats;
115#else
116 struct disk_stats dkstats;
c17bb495 117#endif
1da177e4
LT		 118};
119
120#define GENHD_FL_REMOVABLE 1
121#define GENHD_FL_DRIVERFS 2
86ce18d7 122#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4
LT		 123#define GENHD_FL_CD 8
124#define GENHD_FL_UP 16
125#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
c17bb495 126#define GENHD_FL_FAIL 64
1da177e4 127
ea5c48ab 128
1da177e4
LT		 129struct gendisk {
130 int major; /* major number of driver */
131 int first_minor;
132 int minors; /* maximum number of minors, =1 for
133 * disks that can't be partitioned. */
134 char disk_name[32]; /* name of major driver */
135 struct hd_struct **part; /* [indexed by minor] */
136 struct block_device_operations *fops;
137 struct request_queue *queue;
138 void *private_data;
139 sector_t capacity;
140
141 int flags;
edfaa7c3
KS		 142 struct device *driverfs_dev; // FIXME: remove
143 struct device dev;
6a4d44c1
JN		 144 struct kobject *holder_dir;
145 struct kobject *slave_dir;
1da177e4
LT		 146
147 struct timer_rand_state *random;
148 int policy;
149
150 atomic_t sync_io; /* RAID */
20e5c81f 151 unsigned long stamp;
1da177e4
LT		 152 int in_flight;
153#ifdef CONFIG_SMP
154 struct disk_stats *dkstats;
155#else
156 struct disk_stats dkstats;
157#endif
8ce7ad7b 158 struct work_struct async_notify;
1da177e4
LT		 159};
160
1da177e4
LT		 161/*
162 * Macros to operate on percpu disk statistics:
163 *
164 * The __ variants should only be called in critical sections. The full
165 * variants disable/enable preemption.
166 */
ea5c48ab
JM		 167static inline struct hd_struct *get_part(struct gendisk *gendiskp,
168 sector_t sector)
169{
170 struct hd_struct *part;
171 int i;
172 for (i = 0; i < gendiskp->minors - 1; i++) {
173 part = gendiskp->part[i];
174 if (part && part->start_sect <= sector
175 && sector < part->start_sect + part->nr_sects)
176 return part;
177 }
178 return NULL;
179}
180
1da177e4
LT		 181#ifdef CONFIG_SMP
182#define __disk_stat_add(gendiskp, field, addnd) \
183 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
184
185#define disk_stat_read(gendiskp, field) \
186({ \
187 typeof(gendiskp->dkstats->field) res = 0; \
188 int i; \
0a945022 189 for_each_possible_cpu(i) \
1da177e4 190 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4
LT		 191 res; \
192})
193
194static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
195 int i;
0a945022 196 for_each_possible_cpu(i)
394e3902
AM		 197 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
198 sizeof (struct disk_stats));
1da177e4 199}
ea5c48ab
JM		 200
201#define __part_stat_add(part, field, addnd) \
202 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
203
204#define __all_stat_add(gendiskp, field, addnd, sector) \
205({ \
206 struct hd_struct *part = get_part(gendiskp, sector); \
207 if (part) \
208 __part_stat_add(part, field, addnd); \
209 __disk_stat_add(gendiskp, field, addnd); \
210})
211
212#define part_stat_read(part, field) \
213({ \
214 typeof(part->dkstats->field) res = 0; \
215 int i; \
216 for_each_possible_cpu(i) \
217 res += per_cpu_ptr(part->dkstats, i)->field; \
218 res; \
219})
220
221static inline void part_stat_set_all(struct hd_struct *part, int value) {
222 int i;
223 for_each_possible_cpu(i)
224 memset(per_cpu_ptr(part->dkstats, i), value,
225 sizeof(struct disk_stats));
226}
1da177e4
LT		 227
228#else
229#define __disk_stat_add(gendiskp, field, addnd) \
230 (gendiskp->dkstats.field += addnd)
231#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
232
ea5c48ab
JM		 233static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
234{
1da177e4
LT		 235 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
236}
ea5c48ab
JM		 237
238#define __part_stat_add(part, field, addnd) \
239 (part->dkstats.field += addnd)
240
241#define __all_stat_add(gendiskp, field, addnd, sector) \
242({ \
243 struct hd_struct *part = get_part(gendiskp, sector); \
244 if (part) \
245 part->dkstats.field += addnd; \
246 __disk_stat_add(gendiskp, field, addnd); \
247})
248
249#define part_stat_read(part, field) (part->dkstats.field)
250
251static inline void part_stat_set_all(struct hd_struct *part, int value)
252{
253 memset(&part->dkstats, value, sizeof(struct disk_stats));
254}
255
1da177e4
LT		 256#endif
257
258#define disk_stat_add(gendiskp, field, addnd) \
259 do { \
260 preempt_disable(); \
261 __disk_stat_add(gendiskp, field, addnd); \
262 preempt_enable(); \
263 } while (0)
264
265#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
266#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
267
268#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
269#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
270
271#define __disk_stat_sub(gendiskp, field, subnd) \
272 __disk_stat_add(gendiskp, field, -subnd)
273#define disk_stat_sub(gendiskp, field, subnd) \
274 disk_stat_add(gendiskp, field, -subnd)
275
ea5c48ab
JM		 276#define part_stat_add(gendiskp, field, addnd) \
277 do { \
278 preempt_disable(); \
279 __part_stat_add(gendiskp, field, addnd);\
280 preempt_enable(); \
281 } while (0)
282
283#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
284#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
285
286#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
287#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
288
289#define __part_stat_sub(gendiskp, field, subnd) \
290 __part_stat_add(gendiskp, field, -subnd)
291#define part_stat_sub(gendiskp, field, subnd) \
292 part_stat_add(gendiskp, field, -subnd)
293
294#define all_stat_add(gendiskp, field, addnd, sector) \
295 do { \
296 preempt_disable(); \
297 __all_stat_add(gendiskp, field, addnd, sector); \
298 preempt_enable(); \
299 } while (0)
300
301#define __all_stat_dec(gendiskp, field, sector) \
302 __all_stat_add(gendiskp, field, -1, sector)
303#define all_stat_dec(gendiskp, field, sector) \
304 all_stat_add(gendiskp, field, -1, sector)
305
306#define __all_stat_inc(gendiskp, field, sector) \
307 __all_stat_add(gendiskp, field, 1, sector)
308#define all_stat_inc(gendiskp, field, sector) \
309 all_stat_add(gendiskp, field, 1, sector)
310
311#define __all_stat_sub(gendiskp, field, subnd, sector) \
312 __all_stat_add(gendiskp, field, -subnd, sector)
313#define all_stat_sub(gendiskp, field, subnd, sector) \
314 all_stat_add(gendiskp, field, -subnd, sector)
1da177e4
LT		 315
316/* Inlines to alloc and free disk stats in struct gendisk */
317#ifdef CONFIG_SMP
318static inline int init_disk_stats(struct gendisk *disk)
319{
320 disk->dkstats = alloc_percpu(struct disk_stats);
321 if (!disk->dkstats)
322 return 0;
323 return 1;
324}
325
326static inline void free_disk_stats(struct gendisk *disk)
327{
328 free_percpu(disk->dkstats);
329}
ea5c48ab
JM		 330
331static 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
339static inline void free_part_stats(struct hd_struct *part)
340{
341 free_percpu(part->dkstats);
342}
343
1da177e4
LT		 344#else /* CONFIG_SMP */
345static inline int init_disk_stats(struct gendisk *disk)
346{
347 return 1;
348}
349
350static inline void free_disk_stats(struct gendisk *disk)
351{
352}
ea5c48ab
JM		 353
354static inline int init_part_stats(struct hd_struct *part)
355{
356 return 1;
357}
358
359static inline void free_part_stats(struct hd_struct *part)
360{
361}
1da177e4
LT		 362#endif /* CONFIG_SMP */
363
364/* drivers/block/ll_rw_blk.c */
365extern void disk_round_stats(struct gendisk *disk);
6f2576af 366extern void part_round_stats(struct hd_struct *part);
1da177e4
LT		 367
368/* drivers/block/genhd.c */
ac20427e 369extern int get_blkdev_list(char *, int);
1da177e4
LT		 370extern void add_disk(struct gendisk *disk);
371extern void del_gendisk(struct gendisk *gp);
372extern void unlink_gendisk(struct gendisk *gp);
373extern struct gendisk *get_gendisk(dev_t dev, int *part);
374
375extern void set_device_ro(struct block_device *bdev, int flag);
376extern void set_disk_ro(struct gendisk *disk, int flag);
377
378/* drivers/char/random.c */
379extern void add_disk_randomness(struct gendisk *disk);
380extern void rand_initialize_disk(struct gendisk *disk);
381
382static inline sector_t get_start_sect(struct block_device *bdev)
383{
384 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
385}
386static inline sector_t get_capacity(struct gendisk *disk)
387{
388 return disk->capacity;
389}
390static inline void set_capacity(struct gendisk *disk, sector_t size)
391{
392 disk->capacity = size;
393}
394
395#endif /* __KERNEL__ */
396
397#ifdef CONFIG_SOLARIS_X86_PARTITION
398
b84d8796 399#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 400#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
401
402struct solaris_x86_slice {
403 __le16 s_tag; /* ID tag of partition */
404 __le16 s_flag; /* permission flags */
405 __le32 s_start; /* start sector no of partition */
406 __le32 s_size; /* # of blocks in partition */
407};
408
409struct solaris_x86_vtoc {
410 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
411 __le32 v_sanity; /* to verify vtoc sanity */
412 __le32 v_version; /* layout version */
413 char v_volume[8]; /* volume name */
414 __le16 v_sectorsz; /* sector size in bytes */
415 __le16 v_nparts; /* number of partitions */
416 unsigned int v_reserved[10]; /* free space */
417 struct solaris_x86_slice
418 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
419 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
420 char v_asciilabel[128]; /* for compatibility */
421};
422
423#endif /* CONFIG_SOLARIS_X86_PARTITION */
424
425#ifdef CONFIG_BSD_DISKLABEL
426/*
427 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
428 * updated by Marc Espie <Marc.Espie@openbsd.org>
429 */
430
431/* check against BSD src/sys/sys/disklabel.h for consistency */
432
433#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
434#define BSD_MAXPARTITIONS 16
435#define OPENBSD_MAXPARTITIONS 16
436#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
437struct bsd_disklabel {
438 __le32 d_magic; /* the magic number */
439 __s16 d_type; /* drive type */
440 __s16 d_subtype; /* controller/d_type specific */
441 char d_typename[16]; /* type name, e.g. "eagle" */
442 char d_packname[16]; /* pack identifier */
443 __u32 d_secsize; /* # of bytes per sector */
444 __u32 d_nsectors; /* # of data sectors per track */
445 __u32 d_ntracks; /* # of tracks per cylinder */
446 __u32 d_ncylinders; /* # of data cylinders per unit */
447 __u32 d_secpercyl; /* # of data sectors per cylinder */
448 __u32 d_secperunit; /* # of data sectors per unit */
449 __u16 d_sparespertrack; /* # of spare sectors per track */
450 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
451 __u32 d_acylinders; /* # of alt. cylinders per unit */
452 __u16 d_rpm; /* rotational speed */
453 __u16 d_interleave; /* hardware sector interleave */
454 __u16 d_trackskew; /* sector 0 skew, per track */
455 __u16 d_cylskew; /* sector 0 skew, per cylinder */
456 __u32 d_headswitch; /* head switch time, usec */
457 __u32 d_trkseek; /* track-to-track seek, usec */
458 __u32 d_flags; /* generic flags */
459#define NDDATA 5
460 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
461#define NSPARE 5
462 __u32 d_spare[NSPARE]; /* reserved for future use */
463 __le32 d_magic2; /* the magic number (again) */
464 __le16 d_checksum; /* xor of data incl. partitions */
465
466 /* filesystem and partition information: */
467 __le16 d_npartitions; /* number of partitions in following */
468 __le32 d_bbsize; /* size of boot area at sn0, bytes */
469 __le32 d_sbsize; /* max size of fs superblock, bytes */
470 struct bsd_partition { /* the partition table */
471 __le32 p_size; /* number of sectors in partition */
472 __le32 p_offset; /* starting sector */
473 __le32 p_fsize; /* filesystem basic fragment size */
474 __u8 p_fstype; /* filesystem type, see below */
475 __u8 p_frag; /* filesystem fragments per block */
476 __le16 p_cpg; /* filesystem cylinders per group */
477 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
478};
479
480#endif /* CONFIG_BSD_DISKLABEL */
481
482#ifdef CONFIG_UNIXWARE_DISKLABEL
483/*
484 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
485 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
486 */
487
488#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
489#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
490#define UNIXWARE_NUMSLICE 16
491#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
492
493struct unixware_slice {
494 __le16 s_label; /* label */
495 __le16 s_flags; /* permission flags */
496 __le32 start_sect; /* starting sector */
497 __le32 nr_sects; /* number of sectors in slice */
498};
499
500struct unixware_disklabel {
501 __le32 d_type; /* drive type */
502 __le32 d_magic; /* the magic number */
503 __le32 d_version; /* version number */
504 char d_serial[12]; /* serial number of the device */
505 __le32 d_ncylinders; /* # of data cylinders per device */
506 __le32 d_ntracks; /* # of tracks per cylinder */
507 __le32 d_nsectors; /* # of data sectors per track */
508 __le32 d_secsize; /* # of bytes per sector */
509 __le32 d_part_start; /* # of first sector of this partition */
510 __le32 d_unknown1[12]; /* ? */
511 __le32 d_alt_tbl; /* byte offset of alternate table */
512 __le32 d_alt_len; /* byte length of alternate table */
513 __le32 d_phys_cyl; /* # of physical cylinders per device */
514 __le32 d_phys_trk; /* # of physical tracks per cylinder */
515 __le32 d_phys_sec; /* # of physical sectors per track */
516 __le32 d_phys_bytes; /* # of physical bytes per sector */
517 __le32 d_unknown2; /* ? */
518 __le32 d_unknown3; /* ? */
519 __le32 d_pad[8]; /* pad */
520
521 struct unixware_vtoc {
522 __le32 v_magic; /* the magic number */
523 __le32 v_version; /* version number */
524 char v_name[8]; /* volume name */
525 __le16 v_nslices; /* # of slices */
526 __le16 v_unknown1; /* ? */
527 __le32 v_reserved[10]; /* reserved */
528 struct unixware_slice
529 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
530 } vtoc;
531
532}; /* 408 */
533
534#endif /* CONFIG_UNIXWARE_DISKLABEL */
535
536#ifdef CONFIG_MINIX_SUBPARTITION
537# define MINIX_NR_SUBPARTITIONS 4
538#endif /* CONFIG_MINIX_SUBPARTITION */
539
540#ifdef __KERNEL__
541
d18d7682
FMDN		 542#define ADDPART_FLAG_NONE 0
543#define ADDPART_FLAG_RAID 1
544#define ADDPART_FLAG_WHOLEDISK 2
545
edfaa7c3
KS		 546extern dev_t blk_lookup_devt(const char *name);
547extern char *disk_name (struct gendisk *hd, int part, char *buf);
1da177e4
LT		 548
549extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
d18d7682 550extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4 551extern void delete_partition(struct gendisk *, int);
dd2a345f 552extern void printk_all_partitions(void);
1da177e4 553
1946089a 554extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4
LT		 555extern struct gendisk *alloc_disk(int minors);
556extern struct kobject *get_disk(struct gendisk *disk);
557extern void put_disk(struct gendisk *disk);
edfaa7c3 558extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 559 struct module *module,
560 struct kobject *(*probe)(dev_t, int *, void *),
561 int (*lock)(dev_t, void *),
562 void *data);
edfaa7c3 563extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4
LT		 564
565static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
566{
567 return bdget(MKDEV(disk->major, disk->first_minor) + index);
568}
569
570#endif
571
87c1efbf
JA		 572#else /* CONFIG_BLOCK */
573
574static inline void printk_all_partitions(void) { }
575
edfaa7c3
KS		 576static inline dev_t blk_lookup_devt(const char *name)
577{
578 dev_t devt = MKDEV(0, 0);
579 return devt;
580}
581
87c1efbf 582#endif /* CONFIG_BLOCK */
9361401e
DH		 583
584#endif
Linux kernel - Deliverables
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