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-rw-r--r--include/linux/genhd.h424
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diff --git a/include/linux/genhd.h b/include/linux/genhd.h
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+++ b/include/linux/genhd.h
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+#ifndef _LINUX_GENHD_H
+#define _LINUX_GENHD_H
+
+/*
+ * genhd.h Copyright (C) 1992 Drew Eckhardt
+ * Generic hard disk header file by
+ * Drew Eckhardt
+ *
+ * <drew@colorado.edu>
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/major.h>
+#include <linux/device.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+
+enum {
+/* These three have identical behaviour; use the second one if DOS FDISK gets
+ confused about extended/logical partitions starting past cylinder 1023. */
+ DOS_EXTENDED_PARTITION = 5,
+ LINUX_EXTENDED_PARTITION = 0x85,
+ WIN98_EXTENDED_PARTITION = 0x0f,
+
+ LINUX_SWAP_PARTITION = 0x82,
+ LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
+
+ SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
+ NEW_SOLARIS_X86_PARTITION = 0xbf,
+
+ DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
+ DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
+ DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
+ EZD_PARTITION = 0x55, /* EZ-DRIVE */
+
+ FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
+ OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
+ NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
+ BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
+ MINIX_PARTITION = 0x81, /* Minix Partition ID */
+ UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
+};
+
+#ifndef __KERNEL__
+
+struct partition {
+ unsigned char boot_ind; /* 0x80 - active */
+ unsigned char head; /* starting head */
+ unsigned char sector; /* starting sector */
+ unsigned char cyl; /* starting cylinder */
+ unsigned char sys_ind; /* What partition type */
+ unsigned char end_head; /* end head */
+ unsigned char end_sector; /* end sector */
+ unsigned char end_cyl; /* end cylinder */
+ unsigned int start_sect; /* starting sector counting from 0 */
+ unsigned int nr_sects; /* nr of sectors in partition */
+} __attribute__((packed));
+
+#endif
+
+#ifdef __KERNEL__
+struct partition {
+ unsigned char boot_ind; /* 0x80 - active */
+ unsigned char head; /* starting head */
+ unsigned char sector; /* starting sector */
+ unsigned char cyl; /* starting cylinder */
+ unsigned char sys_ind; /* What partition type */
+ unsigned char end_head; /* end head */
+ unsigned char end_sector; /* end sector */
+ unsigned char end_cyl; /* end cylinder */
+ __le32 start_sect; /* starting sector counting from 0 */
+ __le32 nr_sects; /* nr of sectors in partition */
+} __attribute__((packed));
+
+struct hd_struct {
+ sector_t start_sect;
+ sector_t nr_sects;
+ struct kobject kobj;
+ unsigned reads, read_sectors, writes, write_sectors;
+ int policy, partno;
+};
+
+#define GENHD_FL_REMOVABLE 1
+#define GENHD_FL_DRIVERFS 2
+#define GENHD_FL_CD 8
+#define GENHD_FL_UP 16
+#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
+
+struct disk_stats {
+ unsigned read_sectors, write_sectors;
+ unsigned reads, writes;
+ unsigned read_merges, write_merges;
+ unsigned read_ticks, write_ticks;
+ unsigned io_ticks;
+ unsigned time_in_queue;
+};
+
+struct gendisk {
+ int major; /* major number of driver */
+ int first_minor;
+ int minors; /* maximum number of minors, =1 for
+ * disks that can't be partitioned. */
+ char disk_name[32]; /* name of major driver */
+ struct hd_struct **part; /* [indexed by minor] */
+ struct block_device_operations *fops;
+ struct request_queue *queue;
+ void *private_data;
+ sector_t capacity;
+
+ int flags;
+ char devfs_name[64]; /* devfs crap */
+ int number; /* more of the same */
+ struct device *driverfs_dev;
+ struct kobject kobj;
+
+ struct timer_rand_state *random;
+ int policy;
+
+ atomic_t sync_io; /* RAID */
+ unsigned long stamp, stamp_idle;
+ int in_flight;
+#ifdef CONFIG_SMP
+ struct disk_stats *dkstats;
+#else
+ struct disk_stats dkstats;
+#endif
+};
+
+/* Structure for sysfs attributes on block devices */
+struct disk_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct gendisk *, char *);
+};
+
+/*
+ * Macros to operate on percpu disk statistics:
+ *
+ * The __ variants should only be called in critical sections. The full
+ * variants disable/enable preemption.
+ */
+#ifdef CONFIG_SMP
+#define __disk_stat_add(gendiskp, field, addnd) \
+ (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
+
+#define disk_stat_read(gendiskp, field) \
+({ \
+ typeof(gendiskp->dkstats->field) res = 0; \
+ int i; \
+ for (i=0; i < NR_CPUS; i++) { \
+ if (!cpu_possible(i)) \
+ continue; \
+ res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
+ } \
+ res; \
+})
+
+static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
+ int i;
+ for (i=0; i < NR_CPUS; i++) {
+ if (cpu_possible(i)) {
+ memset(per_cpu_ptr(gendiskp->dkstats, i), value,
+ sizeof (struct disk_stats));
+ }
+ }
+}
+
+#else
+#define __disk_stat_add(gendiskp, field, addnd) \
+ (gendiskp->dkstats.field += addnd)
+#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
+
+static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
+ memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
+}
+#endif
+
+#define disk_stat_add(gendiskp, field, addnd) \
+ do { \
+ preempt_disable(); \
+ __disk_stat_add(gendiskp, field, addnd); \
+ preempt_enable(); \
+ } while (0)
+
+#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
+#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
+
+#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
+#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
+
+#define __disk_stat_sub(gendiskp, field, subnd) \
+ __disk_stat_add(gendiskp, field, -subnd)
+#define disk_stat_sub(gendiskp, field, subnd) \
+ disk_stat_add(gendiskp, field, -subnd)
+
+
+/* Inlines to alloc and free disk stats in struct gendisk */
+#ifdef CONFIG_SMP
+static inline int init_disk_stats(struct gendisk *disk)
+{
+ disk->dkstats = alloc_percpu(struct disk_stats);
+ if (!disk->dkstats)
+ return 0;
+ return 1;
+}
+
+static inline void free_disk_stats(struct gendisk *disk)
+{
+ free_percpu(disk->dkstats);
+}
+#else /* CONFIG_SMP */
+static inline int init_disk_stats(struct gendisk *disk)
+{
+ return 1;
+}
+
+static inline void free_disk_stats(struct gendisk *disk)
+{
+}
+#endif /* CONFIG_SMP */
+
+/* drivers/block/ll_rw_blk.c */
+extern void disk_round_stats(struct gendisk *disk);
+
+/* drivers/block/genhd.c */
+extern int get_blkdev_list(char *);
+extern void add_disk(struct gendisk *disk);
+extern void del_gendisk(struct gendisk *gp);
+extern void unlink_gendisk(struct gendisk *gp);
+extern struct gendisk *get_gendisk(dev_t dev, int *part);
+
+extern void set_device_ro(struct block_device *bdev, int flag);
+extern void set_disk_ro(struct gendisk *disk, int flag);
+
+/* drivers/char/random.c */
+extern void add_disk_randomness(struct gendisk *disk);
+extern void rand_initialize_disk(struct gendisk *disk);
+
+static inline sector_t get_start_sect(struct block_device *bdev)
+{
+ return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
+}
+static inline sector_t get_capacity(struct gendisk *disk)
+{
+ return disk->capacity;
+}
+static inline void set_capacity(struct gendisk *disk, sector_t size)
+{
+ disk->capacity = size;
+}
+
+#endif /* __KERNEL__ */
+
+#ifdef CONFIG_SOLARIS_X86_PARTITION
+
+#define SOLARIS_X86_NUMSLICE 8
+#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
+
+struct solaris_x86_slice {
+ __le16 s_tag; /* ID tag of partition */
+ __le16 s_flag; /* permission flags */
+ __le32 s_start; /* start sector no of partition */
+ __le32 s_size; /* # of blocks in partition */
+};
+
+struct solaris_x86_vtoc {
+ unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
+ __le32 v_sanity; /* to verify vtoc sanity */
+ __le32 v_version; /* layout version */
+ char v_volume[8]; /* volume name */
+ __le16 v_sectorsz; /* sector size in bytes */
+ __le16 v_nparts; /* number of partitions */
+ unsigned int v_reserved[10]; /* free space */
+ struct solaris_x86_slice
+ v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
+ unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
+ char v_asciilabel[128]; /* for compatibility */
+};
+
+#endif /* CONFIG_SOLARIS_X86_PARTITION */
+
+#ifdef CONFIG_BSD_DISKLABEL
+/*
+ * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
+ * updated by Marc Espie <Marc.Espie@openbsd.org>
+ */
+
+/* check against BSD src/sys/sys/disklabel.h for consistency */
+
+#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
+#define BSD_MAXPARTITIONS 16
+#define OPENBSD_MAXPARTITIONS 16
+#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
+struct bsd_disklabel {
+ __le32 d_magic; /* the magic number */
+ __s16 d_type; /* drive type */
+ __s16 d_subtype; /* controller/d_type specific */
+ char d_typename[16]; /* type name, e.g. "eagle" */
+ char d_packname[16]; /* pack identifier */
+ __u32 d_secsize; /* # of bytes per sector */
+ __u32 d_nsectors; /* # of data sectors per track */
+ __u32 d_ntracks; /* # of tracks per cylinder */
+ __u32 d_ncylinders; /* # of data cylinders per unit */
+ __u32 d_secpercyl; /* # of data sectors per cylinder */
+ __u32 d_secperunit; /* # of data sectors per unit */
+ __u16 d_sparespertrack; /* # of spare sectors per track */
+ __u16 d_sparespercyl; /* # of spare sectors per cylinder */
+ __u32 d_acylinders; /* # of alt. cylinders per unit */
+ __u16 d_rpm; /* rotational speed */
+ __u16 d_interleave; /* hardware sector interleave */
+ __u16 d_trackskew; /* sector 0 skew, per track */
+ __u16 d_cylskew; /* sector 0 skew, per cylinder */
+ __u32 d_headswitch; /* head switch time, usec */
+ __u32 d_trkseek; /* track-to-track seek, usec */
+ __u32 d_flags; /* generic flags */
+#define NDDATA 5
+ __u32 d_drivedata[NDDATA]; /* drive-type specific information */
+#define NSPARE 5
+ __u32 d_spare[NSPARE]; /* reserved for future use */
+ __le32 d_magic2; /* the magic number (again) */
+ __le16 d_checksum; /* xor of data incl. partitions */
+
+ /* filesystem and partition information: */
+ __le16 d_npartitions; /* number of partitions in following */
+ __le32 d_bbsize; /* size of boot area at sn0, bytes */
+ __le32 d_sbsize; /* max size of fs superblock, bytes */
+ struct bsd_partition { /* the partition table */
+ __le32 p_size; /* number of sectors in partition */
+ __le32 p_offset; /* starting sector */
+ __le32 p_fsize; /* filesystem basic fragment size */
+ __u8 p_fstype; /* filesystem type, see below */
+ __u8 p_frag; /* filesystem fragments per block */
+ __le16 p_cpg; /* filesystem cylinders per group */
+ } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
+};
+
+#endif /* CONFIG_BSD_DISKLABEL */
+
+#ifdef CONFIG_UNIXWARE_DISKLABEL
+/*
+ * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
+ * and Krzysztof G. Baranowski <kgb@knm.org.pl>
+ */
+
+#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
+#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
+#define UNIXWARE_NUMSLICE 16
+#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
+
+struct unixware_slice {
+ __le16 s_label; /* label */
+ __le16 s_flags; /* permission flags */
+ __le32 start_sect; /* starting sector */
+ __le32 nr_sects; /* number of sectors in slice */
+};
+
+struct unixware_disklabel {
+ __le32 d_type; /* drive type */
+ __le32 d_magic; /* the magic number */
+ __le32 d_version; /* version number */
+ char d_serial[12]; /* serial number of the device */
+ __le32 d_ncylinders; /* # of data cylinders per device */
+ __le32 d_ntracks; /* # of tracks per cylinder */
+ __le32 d_nsectors; /* # of data sectors per track */
+ __le32 d_secsize; /* # of bytes per sector */
+ __le32 d_part_start; /* # of first sector of this partition */
+ __le32 d_unknown1[12]; /* ? */
+ __le32 d_alt_tbl; /* byte offset of alternate table */
+ __le32 d_alt_len; /* byte length of alternate table */
+ __le32 d_phys_cyl; /* # of physical cylinders per device */
+ __le32 d_phys_trk; /* # of physical tracks per cylinder */
+ __le32 d_phys_sec; /* # of physical sectors per track */
+ __le32 d_phys_bytes; /* # of physical bytes per sector */
+ __le32 d_unknown2; /* ? */
+ __le32 d_unknown3; /* ? */
+ __le32 d_pad[8]; /* pad */
+
+ struct unixware_vtoc {
+ __le32 v_magic; /* the magic number */
+ __le32 v_version; /* version number */
+ char v_name[8]; /* volume name */
+ __le16 v_nslices; /* # of slices */
+ __le16 v_unknown1; /* ? */
+ __le32 v_reserved[10]; /* reserved */
+ struct unixware_slice
+ v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
+ } vtoc;
+
+}; /* 408 */
+
+#endif /* CONFIG_UNIXWARE_DISKLABEL */
+
+#ifdef CONFIG_MINIX_SUBPARTITION
+# define MINIX_NR_SUBPARTITIONS 4
+#endif /* CONFIG_MINIX_SUBPARTITION */
+
+#ifdef __KERNEL__
+
+char *disk_name (struct gendisk *hd, int part, char *buf);
+
+extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
+extern void add_partition(struct gendisk *, int, sector_t, sector_t);
+extern void delete_partition(struct gendisk *, int);
+
+extern struct gendisk *alloc_disk(int minors);
+extern struct kobject *get_disk(struct gendisk *disk);
+extern void put_disk(struct gendisk *disk);
+
+extern void blk_register_region(dev_t dev, unsigned long range,
+ struct module *module,
+ struct kobject *(*probe)(dev_t, int *, void *),
+ int (*lock)(dev_t, void *),
+ void *data);
+extern void blk_unregister_region(dev_t dev, unsigned long range);
+
+static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
+{
+ return bdget(MKDEV(disk->major, disk->first_minor) + index);
+}
+
+#endif
+
+#endif
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