5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
12 #include <linux/types.h>
17 /* These three have identical behaviour; use the second one if DOS FDISK gets
18 confused about extended/logical partitions starting past cylinder 1023. */
19 DOS_EXTENDED_PARTITION = 5,
20 LINUX_EXTENDED_PARTITION = 0x85,
21 WIN98_EXTENDED_PARTITION = 0x0f,
23 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
25 LINUX_SWAP_PARTITION = 0x82,
26 LINUX_DATA_PARTITION = 0x83,
27 LINUX_LVM_PARTITION = 0x8e,
28 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
30 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
31 NEW_SOLARIS_X86_PARTITION = 0xbf,
33 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
34 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
35 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
36 EZD_PARTITION = 0x55, /* EZ-DRIVE */
38 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
39 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
40 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
41 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
42 MINIX_PARTITION = 0x81, /* Minix Partition ID */
43 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
49 unsigned char boot_ind; /* 0x80 - active */
50 unsigned char head; /* starting head */
51 unsigned char sector; /* starting sector */
52 unsigned char cyl; /* starting cylinder */
53 unsigned char sys_ind; /* What partition type */
54 unsigned char end_head; /* end head */
55 unsigned char end_sector; /* end sector */
56 unsigned char end_cyl; /* end cylinder */
57 unsigned int start_sect; /* starting sector counting from 0 */
58 unsigned int nr_sects; /* nr of sectors in partition */
59 } __attribute__((packed));
64 #include <linux/major.h>
65 #include <linux/device.h>
66 #include <linux/smp.h>
67 #include <linux/string.h>
69 #include <linux/workqueue.h>
70 #include <linux/bsg.h>
73 unsigned char boot_ind; /* 0x80 - active */
74 unsigned char head; /* starting head */
75 unsigned char sector; /* starting sector */
76 unsigned char cyl; /* starting cylinder */
77 unsigned char sys_ind; /* What partition type */
78 unsigned char end_head; /* end head */
79 unsigned char end_sector; /* end sector */
80 unsigned char end_cyl; /* end cylinder */
81 __le32 start_sect; /* starting sector counting from 0 */
82 __le32 nr_sects; /* nr of sectors in partition */
83 } __attribute__((packed));
89 struct kobject *holder_dir;
90 unsigned ios[2], sectors[2]; /* READs and WRITEs */
92 #ifdef CONFIG_FAIL_MAKE_REQUEST
95 struct bsg_class_device bsg_dev;
98 #define GENHD_FL_REMOVABLE 1
99 #define GENHD_FL_DRIVERFS 2
100 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
101 #define GENHD_FL_CD 8
102 #define GENHD_FL_UP 16
103 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
104 #define GENHD_FL_FAIL 64
107 unsigned long sectors[2]; /* READs and WRITEs */
108 unsigned long ios[2];
109 unsigned long merges[2];
110 unsigned long ticks[2];
111 unsigned long io_ticks;
112 unsigned long time_in_queue;
116 int major; /* major number of driver */
118 int minors; /* maximum number of minors, =1 for
119 * disks that can't be partitioned. */
120 char disk_name[32]; /* name of major driver */
121 struct hd_struct **part; /* [indexed by minor] */
122 int part_uevent_suppress;
123 struct block_device_operations *fops;
124 struct request_queue *queue;
129 struct device *driverfs_dev;
131 struct kobject *holder_dir;
132 struct kobject *slave_dir;
134 struct timer_rand_state *random;
137 atomic_t sync_io; /* RAID */
141 struct disk_stats *dkstats;
143 struct disk_stats dkstats;
145 struct work_struct async_notify;
148 /* Structure for sysfs attributes on block devices */
149 struct disk_attribute {
150 struct attribute attr;
151 ssize_t (*show)(struct gendisk *, char *);
152 ssize_t (*store)(struct gendisk *, const char *, size_t);
156 * Macros to operate on percpu disk statistics:
158 * The __ variants should only be called in critical sections. The full
159 * variants disable/enable preemption.
162 #define __disk_stat_add(gendiskp, field, addnd) \
163 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
165 #define disk_stat_read(gendiskp, field) \
167 typeof(gendiskp->dkstats->field) res = 0; \
169 for_each_possible_cpu(i) \
170 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
174 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
176 for_each_possible_cpu(i)
177 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
178 sizeof (struct disk_stats));
182 #define __disk_stat_add(gendiskp, field, addnd) \
183 (gendiskp->dkstats.field += addnd)
184 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
186 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
187 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
191 #define disk_stat_add(gendiskp, field, addnd) \
194 __disk_stat_add(gendiskp, field, addnd); \
198 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
199 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
201 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
202 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
204 #define __disk_stat_sub(gendiskp, field, subnd) \
205 __disk_stat_add(gendiskp, field, -subnd)
206 #define disk_stat_sub(gendiskp, field, subnd) \
207 disk_stat_add(gendiskp, field, -subnd)
210 /* Inlines to alloc and free disk stats in struct gendisk */
212 static inline int init_disk_stats(struct gendisk *disk)
214 disk->dkstats = alloc_percpu(struct disk_stats);
220 static inline void free_disk_stats(struct gendisk *disk)
222 free_percpu(disk->dkstats);
224 #else /* CONFIG_SMP */
225 static inline int init_disk_stats(struct gendisk *disk)
230 static inline void free_disk_stats(struct gendisk *disk)
233 #endif /* CONFIG_SMP */
235 /* drivers/block/ll_rw_blk.c */
236 extern void disk_round_stats(struct gendisk *disk);
238 /* drivers/block/genhd.c */
239 extern int get_blkdev_list(char *, int);
240 extern void add_disk(struct gendisk *disk);
241 extern void del_gendisk(struct gendisk *gp);
242 extern void unlink_gendisk(struct gendisk *gp);
243 extern struct gendisk *get_gendisk(dev_t dev, int *part);
245 extern void set_device_ro(struct block_device *bdev, int flag);
246 extern void set_disk_ro(struct gendisk *disk, int flag);
248 /* drivers/char/random.c */
249 extern void add_disk_randomness(struct gendisk *disk);
250 extern void rand_initialize_disk(struct gendisk *disk);
252 static inline sector_t get_start_sect(struct block_device *bdev)
254 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
256 static inline sector_t get_capacity(struct gendisk *disk)
258 return disk->capacity;
260 static inline void set_capacity(struct gendisk *disk, sector_t size)
262 disk->capacity = size;
265 #endif /* __KERNEL__ */
267 #ifdef CONFIG_SOLARIS_X86_PARTITION
269 #define SOLARIS_X86_NUMSLICE 8
270 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
272 struct solaris_x86_slice {
273 __le16 s_tag; /* ID tag of partition */
274 __le16 s_flag; /* permission flags */
275 __le32 s_start; /* start sector no of partition */
276 __le32 s_size; /* # of blocks in partition */
279 struct solaris_x86_vtoc {
280 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
281 __le32 v_sanity; /* to verify vtoc sanity */
282 __le32 v_version; /* layout version */
283 char v_volume[8]; /* volume name */
284 __le16 v_sectorsz; /* sector size in bytes */
285 __le16 v_nparts; /* number of partitions */
286 unsigned int v_reserved[10]; /* free space */
287 struct solaris_x86_slice
288 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
289 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
290 char v_asciilabel[128]; /* for compatibility */
293 #endif /* CONFIG_SOLARIS_X86_PARTITION */
295 #ifdef CONFIG_BSD_DISKLABEL
297 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
298 * updated by Marc Espie <Marc.Espie@openbsd.org>
301 /* check against BSD src/sys/sys/disklabel.h for consistency */
303 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
304 #define BSD_MAXPARTITIONS 16
305 #define OPENBSD_MAXPARTITIONS 16
306 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
307 struct bsd_disklabel {
308 __le32 d_magic; /* the magic number */
309 __s16 d_type; /* drive type */
310 __s16 d_subtype; /* controller/d_type specific */
311 char d_typename[16]; /* type name, e.g. "eagle" */
312 char d_packname[16]; /* pack identifier */
313 __u32 d_secsize; /* # of bytes per sector */
314 __u32 d_nsectors; /* # of data sectors per track */
315 __u32 d_ntracks; /* # of tracks per cylinder */
316 __u32 d_ncylinders; /* # of data cylinders per unit */
317 __u32 d_secpercyl; /* # of data sectors per cylinder */
318 __u32 d_secperunit; /* # of data sectors per unit */
319 __u16 d_sparespertrack; /* # of spare sectors per track */
320 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
321 __u32 d_acylinders; /* # of alt. cylinders per unit */
322 __u16 d_rpm; /* rotational speed */
323 __u16 d_interleave; /* hardware sector interleave */
324 __u16 d_trackskew; /* sector 0 skew, per track */
325 __u16 d_cylskew; /* sector 0 skew, per cylinder */
326 __u32 d_headswitch; /* head switch time, usec */
327 __u32 d_trkseek; /* track-to-track seek, usec */
328 __u32 d_flags; /* generic flags */
330 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
332 __u32 d_spare[NSPARE]; /* reserved for future use */
333 __le32 d_magic2; /* the magic number (again) */
334 __le16 d_checksum; /* xor of data incl. partitions */
336 /* filesystem and partition information: */
337 __le16 d_npartitions; /* number of partitions in following */
338 __le32 d_bbsize; /* size of boot area at sn0, bytes */
339 __le32 d_sbsize; /* max size of fs superblock, bytes */
340 struct bsd_partition { /* the partition table */
341 __le32 p_size; /* number of sectors in partition */
342 __le32 p_offset; /* starting sector */
343 __le32 p_fsize; /* filesystem basic fragment size */
344 __u8 p_fstype; /* filesystem type, see below */
345 __u8 p_frag; /* filesystem fragments per block */
346 __le16 p_cpg; /* filesystem cylinders per group */
347 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
350 #endif /* CONFIG_BSD_DISKLABEL */
352 #ifdef CONFIG_UNIXWARE_DISKLABEL
354 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
355 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
358 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
359 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
360 #define UNIXWARE_NUMSLICE 16
361 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
363 struct unixware_slice {
364 __le16 s_label; /* label */
365 __le16 s_flags; /* permission flags */
366 __le32 start_sect; /* starting sector */
367 __le32 nr_sects; /* number of sectors in slice */
370 struct unixware_disklabel {
371 __le32 d_type; /* drive type */
372 __le32 d_magic; /* the magic number */
373 __le32 d_version; /* version number */
374 char d_serial[12]; /* serial number of the device */
375 __le32 d_ncylinders; /* # of data cylinders per device */
376 __le32 d_ntracks; /* # of tracks per cylinder */
377 __le32 d_nsectors; /* # of data sectors per track */
378 __le32 d_secsize; /* # of bytes per sector */
379 __le32 d_part_start; /* # of first sector of this partition */
380 __le32 d_unknown1[12]; /* ? */
381 __le32 d_alt_tbl; /* byte offset of alternate table */
382 __le32 d_alt_len; /* byte length of alternate table */
383 __le32 d_phys_cyl; /* # of physical cylinders per device */
384 __le32 d_phys_trk; /* # of physical tracks per cylinder */
385 __le32 d_phys_sec; /* # of physical sectors per track */
386 __le32 d_phys_bytes; /* # of physical bytes per sector */
387 __le32 d_unknown2; /* ? */
388 __le32 d_unknown3; /* ? */
389 __le32 d_pad[8]; /* pad */
391 struct unixware_vtoc {
392 __le32 v_magic; /* the magic number */
393 __le32 v_version; /* version number */
394 char v_name[8]; /* volume name */
395 __le16 v_nslices; /* # of slices */
396 __le16 v_unknown1; /* ? */
397 __le32 v_reserved[10]; /* reserved */
398 struct unixware_slice
399 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
404 #endif /* CONFIG_UNIXWARE_DISKLABEL */
406 #ifdef CONFIG_MINIX_SUBPARTITION
407 # define MINIX_NR_SUBPARTITIONS 4
408 #endif /* CONFIG_MINIX_SUBPARTITION */
412 #define ADDPART_FLAG_NONE 0
413 #define ADDPART_FLAG_RAID 1
414 #define ADDPART_FLAG_WHOLEDISK 2
416 char *disk_name (struct gendisk *hd, int part, char *buf);
418 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
419 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
420 extern void delete_partition(struct gendisk *, int);
421 extern void printk_all_partitions(void);
423 extern struct gendisk *alloc_disk_node(int minors, int node_id);
424 extern struct gendisk *alloc_disk(int minors);
425 extern struct kobject *get_disk(struct gendisk *disk);
426 extern void put_disk(struct gendisk *disk);
427 extern void genhd_media_change_notify(struct gendisk *disk);
428 extern void blk_register_region(dev_t dev, unsigned long range,
429 struct module *module,
430 struct kobject *(*probe)(dev_t, int *, void *),
431 int (*lock)(dev_t, void *),
433 extern void blk_unregister_region(dev_t dev, unsigned long range);
435 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
437 return bdget(MKDEV(disk->major, disk->first_minor) + index);
442 #else /* CONFIG_BLOCK */
444 static inline void printk_all_partitions(void) { }
446 #endif /* CONFIG_BLOCK */