5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
12 #include <linux/config.h>
13 #include <linux/types.h>
14 #include <linux/major.h>
15 #include <linux/device.h>
16 #include <linux/smp.h>
17 #include <linux/string.h>
21 /* These three have identical behaviour; use the second one if DOS FDISK gets
22 confused about extended/logical partitions starting past cylinder 1023. */
23 DOS_EXTENDED_PARTITION = 5,
24 LINUX_EXTENDED_PARTITION = 0x85,
25 WIN98_EXTENDED_PARTITION = 0x0f,
27 LINUX_SWAP_PARTITION = 0x82,
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));
65 unsigned char boot_ind; /* 0x80 - active */
66 unsigned char head; /* starting head */
67 unsigned char sector; /* starting sector */
68 unsigned char cyl; /* starting cylinder */
69 unsigned char sys_ind; /* What partition type */
70 unsigned char end_head; /* end head */
71 unsigned char end_sector; /* end sector */
72 unsigned char end_cyl; /* end cylinder */
73 __le32 start_sect; /* starting sector counting from 0 */
74 __le32 nr_sects; /* nr of sectors in partition */
75 } __attribute__((packed));
81 struct kobject *holder_dir;
82 unsigned ios[2], sectors[2]; /* READs and WRITEs */
86 #define GENHD_FL_REMOVABLE 1
87 #define GENHD_FL_DRIVERFS 2
89 #define GENHD_FL_UP 16
90 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
93 unsigned long sectors[2]; /* READs and WRITEs */
95 unsigned long merges[2];
96 unsigned long ticks[2];
97 unsigned long io_ticks;
98 unsigned long time_in_queue;
102 int major; /* major number of driver */
104 int minors; /* maximum number of minors, =1 for
105 * disks that can't be partitioned. */
106 char disk_name[32]; /* name of major driver */
107 struct hd_struct **part; /* [indexed by minor] */
108 struct block_device_operations *fops;
109 struct request_queue *queue;
114 char devfs_name[64]; /* devfs crap */
115 int number; /* more of the same */
116 struct device *driverfs_dev;
118 struct kobject *holder_dir;
119 struct kobject *slave_dir;
121 struct timer_rand_state *random;
124 atomic_t sync_io; /* RAID */
128 struct disk_stats *dkstats;
130 struct disk_stats dkstats;
134 /* Structure for sysfs attributes on block devices */
135 struct disk_attribute {
136 struct attribute attr;
137 ssize_t (*show)(struct gendisk *, char *);
138 ssize_t (*store)(struct gendisk *, const char *, size_t);
142 * Macros to operate on percpu disk statistics:
144 * The __ variants should only be called in critical sections. The full
145 * variants disable/enable preemption.
148 #define __disk_stat_add(gendiskp, field, addnd) \
149 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
151 #define disk_stat_read(gendiskp, field) \
153 typeof(gendiskp->dkstats->field) res = 0; \
155 for_each_possible_cpu(i) \
156 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
160 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
162 for_each_possible_cpu(i)
163 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
164 sizeof (struct disk_stats));
168 #define __disk_stat_add(gendiskp, field, addnd) \
169 (gendiskp->dkstats.field += addnd)
170 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
172 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
173 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
177 #define disk_stat_add(gendiskp, field, addnd) \
180 __disk_stat_add(gendiskp, field, addnd); \
184 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
185 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
187 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
188 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
190 #define __disk_stat_sub(gendiskp, field, subnd) \
191 __disk_stat_add(gendiskp, field, -subnd)
192 #define disk_stat_sub(gendiskp, field, subnd) \
193 disk_stat_add(gendiskp, field, -subnd)
196 /* Inlines to alloc and free disk stats in struct gendisk */
198 static inline int init_disk_stats(struct gendisk *disk)
200 disk->dkstats = alloc_percpu(struct disk_stats);
206 static inline void free_disk_stats(struct gendisk *disk)
208 free_percpu(disk->dkstats);
210 #else /* CONFIG_SMP */
211 static inline int init_disk_stats(struct gendisk *disk)
216 static inline void free_disk_stats(struct gendisk *disk)
219 #endif /* CONFIG_SMP */
221 /* drivers/block/ll_rw_blk.c */
222 extern void disk_round_stats(struct gendisk *disk);
224 /* drivers/block/genhd.c */
225 extern int get_blkdev_list(char *, int);
226 extern void add_disk(struct gendisk *disk);
227 extern void del_gendisk(struct gendisk *gp);
228 extern void unlink_gendisk(struct gendisk *gp);
229 extern struct gendisk *get_gendisk(dev_t dev, int *part);
231 extern void set_device_ro(struct block_device *bdev, int flag);
232 extern void set_disk_ro(struct gendisk *disk, int flag);
234 /* drivers/char/random.c */
235 extern void add_disk_randomness(struct gendisk *disk);
236 extern void rand_initialize_disk(struct gendisk *disk);
238 static inline sector_t get_start_sect(struct block_device *bdev)
240 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
242 static inline sector_t get_capacity(struct gendisk *disk)
244 return disk->capacity;
246 static inline void set_capacity(struct gendisk *disk, sector_t size)
248 disk->capacity = size;
251 #endif /* __KERNEL__ */
253 #ifdef CONFIG_SOLARIS_X86_PARTITION
255 #define SOLARIS_X86_NUMSLICE 8
256 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
258 struct solaris_x86_slice {
259 __le16 s_tag; /* ID tag of partition */
260 __le16 s_flag; /* permission flags */
261 __le32 s_start; /* start sector no of partition */
262 __le32 s_size; /* # of blocks in partition */
265 struct solaris_x86_vtoc {
266 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
267 __le32 v_sanity; /* to verify vtoc sanity */
268 __le32 v_version; /* layout version */
269 char v_volume[8]; /* volume name */
270 __le16 v_sectorsz; /* sector size in bytes */
271 __le16 v_nparts; /* number of partitions */
272 unsigned int v_reserved[10]; /* free space */
273 struct solaris_x86_slice
274 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
275 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
276 char v_asciilabel[128]; /* for compatibility */
279 #endif /* CONFIG_SOLARIS_X86_PARTITION */
281 #ifdef CONFIG_BSD_DISKLABEL
283 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
284 * updated by Marc Espie <Marc.Espie@openbsd.org>
287 /* check against BSD src/sys/sys/disklabel.h for consistency */
289 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
290 #define BSD_MAXPARTITIONS 16
291 #define OPENBSD_MAXPARTITIONS 16
292 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
293 struct bsd_disklabel {
294 __le32 d_magic; /* the magic number */
295 __s16 d_type; /* drive type */
296 __s16 d_subtype; /* controller/d_type specific */
297 char d_typename[16]; /* type name, e.g. "eagle" */
298 char d_packname[16]; /* pack identifier */
299 __u32 d_secsize; /* # of bytes per sector */
300 __u32 d_nsectors; /* # of data sectors per track */
301 __u32 d_ntracks; /* # of tracks per cylinder */
302 __u32 d_ncylinders; /* # of data cylinders per unit */
303 __u32 d_secpercyl; /* # of data sectors per cylinder */
304 __u32 d_secperunit; /* # of data sectors per unit */
305 __u16 d_sparespertrack; /* # of spare sectors per track */
306 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
307 __u32 d_acylinders; /* # of alt. cylinders per unit */
308 __u16 d_rpm; /* rotational speed */
309 __u16 d_interleave; /* hardware sector interleave */
310 __u16 d_trackskew; /* sector 0 skew, per track */
311 __u16 d_cylskew; /* sector 0 skew, per cylinder */
312 __u32 d_headswitch; /* head switch time, usec */
313 __u32 d_trkseek; /* track-to-track seek, usec */
314 __u32 d_flags; /* generic flags */
316 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
318 __u32 d_spare[NSPARE]; /* reserved for future use */
319 __le32 d_magic2; /* the magic number (again) */
320 __le16 d_checksum; /* xor of data incl. partitions */
322 /* filesystem and partition information: */
323 __le16 d_npartitions; /* number of partitions in following */
324 __le32 d_bbsize; /* size of boot area at sn0, bytes */
325 __le32 d_sbsize; /* max size of fs superblock, bytes */
326 struct bsd_partition { /* the partition table */
327 __le32 p_size; /* number of sectors in partition */
328 __le32 p_offset; /* starting sector */
329 __le32 p_fsize; /* filesystem basic fragment size */
330 __u8 p_fstype; /* filesystem type, see below */
331 __u8 p_frag; /* filesystem fragments per block */
332 __le16 p_cpg; /* filesystem cylinders per group */
333 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
336 #endif /* CONFIG_BSD_DISKLABEL */
338 #ifdef CONFIG_UNIXWARE_DISKLABEL
340 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
341 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
344 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
345 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
346 #define UNIXWARE_NUMSLICE 16
347 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
349 struct unixware_slice {
350 __le16 s_label; /* label */
351 __le16 s_flags; /* permission flags */
352 __le32 start_sect; /* starting sector */
353 __le32 nr_sects; /* number of sectors in slice */
356 struct unixware_disklabel {
357 __le32 d_type; /* drive type */
358 __le32 d_magic; /* the magic number */
359 __le32 d_version; /* version number */
360 char d_serial[12]; /* serial number of the device */
361 __le32 d_ncylinders; /* # of data cylinders per device */
362 __le32 d_ntracks; /* # of tracks per cylinder */
363 __le32 d_nsectors; /* # of data sectors per track */
364 __le32 d_secsize; /* # of bytes per sector */
365 __le32 d_part_start; /* # of first sector of this partition */
366 __le32 d_unknown1[12]; /* ? */
367 __le32 d_alt_tbl; /* byte offset of alternate table */
368 __le32 d_alt_len; /* byte length of alternate table */
369 __le32 d_phys_cyl; /* # of physical cylinders per device */
370 __le32 d_phys_trk; /* # of physical tracks per cylinder */
371 __le32 d_phys_sec; /* # of physical sectors per track */
372 __le32 d_phys_bytes; /* # of physical bytes per sector */
373 __le32 d_unknown2; /* ? */
374 __le32 d_unknown3; /* ? */
375 __le32 d_pad[8]; /* pad */
377 struct unixware_vtoc {
378 __le32 v_magic; /* the magic number */
379 __le32 v_version; /* version number */
380 char v_name[8]; /* volume name */
381 __le16 v_nslices; /* # of slices */
382 __le16 v_unknown1; /* ? */
383 __le32 v_reserved[10]; /* reserved */
384 struct unixware_slice
385 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
390 #endif /* CONFIG_UNIXWARE_DISKLABEL */
392 #ifdef CONFIG_MINIX_SUBPARTITION
393 # define MINIX_NR_SUBPARTITIONS 4
394 #endif /* CONFIG_MINIX_SUBPARTITION */
398 char *disk_name (struct gendisk *hd, int part, char *buf);
400 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
401 extern void add_partition(struct gendisk *, int, sector_t, sector_t);
402 extern void delete_partition(struct gendisk *, int);
404 extern struct gendisk *alloc_disk_node(int minors, int node_id);
405 extern struct gendisk *alloc_disk(int minors);
406 extern struct kobject *get_disk(struct gendisk *disk);
407 extern void put_disk(struct gendisk *disk);
409 extern void blk_register_region(dev_t dev, unsigned long range,
410 struct module *module,
411 struct kobject *(*probe)(dev_t, int *, void *),
412 int (*lock)(dev_t, void *),
414 extern void blk_unregister_region(dev_t dev, unsigned long range);
416 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
418 return bdget(MKDEV(disk->major, disk->first_minor) + index);