| #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/types.h> |
| #include <linux/kdev_t.h> |
| #include <linux/rcupdate.h> |
| #include <linux/slab.h> |
| |
| #ifdef CONFIG_BLOCK |
| |
| #define kobj_to_dev(k) container_of((k), struct device, kobj) |
| #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
| #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
| #define disk_to_dev(disk) (&(disk)->part0.__dev) |
| #define part_to_dev(part) (&((part)->__dev)) |
| |
| extern struct device_type part_type; |
| extern struct kobject *block_depr; |
| extern struct class block_class; |
| |
| 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, |
| |
| SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
| |
| LINUX_SWAP_PARTITION = 0x82, |
| LINUX_DATA_PARTITION = 0x83, |
| LINUX_LVM_PARTITION = 0x8e, |
| 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 */ |
| }; |
| |
| #define DISK_MAX_PARTS 256 |
| #define DISK_NAME_LEN 32 |
| |
| #include <linux/major.h> |
| #include <linux/device.h> |
| #include <linux/smp.h> |
| #include <linux/string.h> |
| #include <linux/fs.h> |
| #include <linux/workqueue.h> |
| |
| 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 disk_stats { |
| unsigned long sectors[2]; /* READs and WRITEs */ |
| unsigned long ios[2]; |
| unsigned long merges[2]; |
| unsigned long ticks[2]; |
| unsigned long io_ticks; |
| unsigned long time_in_queue; |
| }; |
| |
| #define PARTITION_META_INFO_VOLNAMELTH 64 |
| #define PARTITION_META_INFO_UUIDLTH 16 |
| |
| struct partition_meta_info { |
| u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */ |
| u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
| }; |
| |
| struct hd_struct { |
| sector_t start_sect; |
| /* |
| * nr_sects is protected by sequence counter. One might extend a |
| * partition while IO is happening to it and update of nr_sects |
| * can be non-atomic on 32bit machines with 64bit sector_t. |
| */ |
| sector_t nr_sects; |
| seqcount_t nr_sects_seq; |
| sector_t alignment_offset; |
| unsigned int discard_alignment; |
| struct device __dev; |
| struct kobject *holder_dir; |
| int policy, partno; |
| struct partition_meta_info *info; |
| #ifdef CONFIG_FAIL_MAKE_REQUEST |
| int make_it_fail; |
| #endif |
| unsigned long stamp; |
| atomic_t in_flight[2]; |
| #ifdef CONFIG_SMP |
| struct disk_stats __percpu *dkstats; |
| #else |
| struct disk_stats dkstats; |
| #endif |
| atomic_t ref; |
| struct rcu_head rcu_head; |
| }; |
| |
| #define GENHD_FL_REMOVABLE 1 |
| /* 2 is unused */ |
| #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
| #define GENHD_FL_CD 8 |
| #define GENHD_FL_UP 16 |
| #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 |
| #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
| #define GENHD_FL_NATIVE_CAPACITY 128 |
| #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
| #define GENHD_FL_NO_PART_SCAN 512 |
| |
| enum { |
| DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ |
| DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ |
| }; |
| |
| #define BLK_SCSI_MAX_CMDS (256) |
| #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| |
| struct blk_scsi_cmd_filter { |
| unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
| unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; |
| struct kobject kobj; |
| }; |
| |
| struct disk_part_tbl { |
| struct rcu_head rcu_head; |
| int len; |
| struct hd_struct __rcu *last_lookup; |
| struct hd_struct __rcu *part[]; |
| }; |
| |
| struct disk_events; |
| |
| struct gendisk { |
| /* major, first_minor and minors are input parameters only, |
| * don't use directly. Use disk_devt() and disk_max_parts(). |
| */ |
| 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[DISK_NAME_LEN]; /* name of major driver */ |
| char *(*devnode)(struct gendisk *gd, umode_t *mode); |
| |
| unsigned int events; /* supported events */ |
| unsigned int async_events; /* async events, subset of all */ |
| |
| /* Array of pointers to partitions indexed by partno. |
| * Protected with matching bdev lock but stat and other |
| * non-critical accesses use RCU. Always access through |
| * helpers. |
| */ |
| struct disk_part_tbl __rcu *part_tbl; |
| struct hd_struct part0; |
| |
| const struct block_device_operations *fops; |
| struct request_queue *queue; |
| void *private_data; |
| |
| int flags; |
| struct device *driverfs_dev; // FIXME: remove |
| struct kobject *slave_dir; |
| |
| struct timer_rand_state *random; |
| atomic_t sync_io; /* RAID */ |
| struct disk_events *ev; |
| #ifdef CONFIG_BLK_DEV_INTEGRITY |
| struct blk_integrity *integrity; |
| #endif |
| int node_id; |
| }; |
| |
| static inline struct gendisk *part_to_disk(struct hd_struct *part) |
| { |
| if (likely(part)) { |
| if (part->partno) |
| return dev_to_disk(part_to_dev(part)->parent); |
| else |
| return dev_to_disk(part_to_dev(part)); |
| } |
| return NULL; |
| } |
| |
| static inline void part_pack_uuid(const u8 *uuid_str, u8 *to) |
| { |
| int i; |
| for (i = 0; i < 16; ++i) { |
| *to++ = (hex_to_bin(*uuid_str) << 4) | |
| (hex_to_bin(*(uuid_str + 1))); |
| uuid_str += 2; |
| switch (i) { |
| case 3: |
| case 5: |
| case 7: |
| case 9: |
| uuid_str++; |
| continue; |
| } |
| } |
| } |
| |
| static inline int disk_max_parts(struct gendisk *disk) |
| { |
| if (disk->flags & GENHD_FL_EXT_DEVT) |
| return DISK_MAX_PARTS; |
| return disk->minors; |
| } |
| |
| static inline bool disk_part_scan_enabled(struct gendisk *disk) |
| { |
| return disk_max_parts(disk) > 1 && |
| !(disk->flags & GENHD_FL_NO_PART_SCAN); |
| } |
| |
| static inline dev_t disk_devt(struct gendisk *disk) |
| { |
| return disk_to_dev(disk)->devt; |
| } |
| |
| static inline dev_t part_devt(struct hd_struct *part) |
| { |
| return part_to_dev(part)->devt; |
| } |
| |
| extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
| |
| static inline void disk_put_part(struct hd_struct *part) |
| { |
| if (likely(part)) |
| put_device(part_to_dev(part)); |
| } |
| |
| /* |
| * Smarter partition iterator without context limits. |
| */ |
| #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ |
| #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ |
| #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
| #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
| |
| struct disk_part_iter { |
| struct gendisk *disk; |
| struct hd_struct *part; |
| int idx; |
| unsigned int flags; |
| }; |
| |
| extern void disk_part_iter_init(struct disk_part_iter *piter, |
| struct gendisk *disk, unsigned int flags); |
| extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); |
| extern void disk_part_iter_exit(struct disk_part_iter *piter); |
| |
| extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, |
| sector_t sector); |
| |
| /* |
| * Macros to operate on percpu disk statistics: |
| * |
| * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
| * and should be called between disk_stat_lock() and |
| * disk_stat_unlock(). |
| * |
| * part_stat_read() can be called at any time. |
| * |
| * part_stat_{add|set_all}() and {init|free}_part_stats are for |
| * internal use only. |
| */ |
| #ifdef CONFIG_SMP |
| #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
| #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) |
| |
| #define __part_stat_add(cpu, part, field, addnd) \ |
| (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) |
| |
| #define part_stat_read(part, field) \ |
| ({ \ |
| typeof((part)->dkstats->field) res = 0; \ |
| unsigned int _cpu; \ |
| for_each_possible_cpu(_cpu) \ |
| res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ |
| res; \ |
| }) |
| |
| static inline void part_stat_set_all(struct hd_struct *part, int value) |
| { |
| int i; |
| |
| for_each_possible_cpu(i) |
| memset(per_cpu_ptr(part->dkstats, i), value, |
| sizeof(struct disk_stats)); |
| } |
| |
| static inline int init_part_stats(struct hd_struct *part) |
| { |
| part->dkstats = alloc_percpu(struct disk_stats); |
| if (!part->dkstats) |
| return 0; |
| return 1; |
| } |
| |
| static inline void free_part_stats(struct hd_struct *part) |
| { |
| free_percpu(part->dkstats); |
| } |
| |
| #else /* !CONFIG_SMP */ |
| #define part_stat_lock() ({ rcu_read_lock(); 0; }) |
| #define part_stat_unlock() rcu_read_unlock() |
| |
| #define __part_stat_add(cpu, part, field, addnd) \ |
| ((part)->dkstats.field += addnd) |
| |
| #define part_stat_read(part, field) ((part)->dkstats.field) |
| |
| static inline void part_stat_set_all(struct hd_struct *part, int value) |
| { |
| memset(&part->dkstats, value, sizeof(struct disk_stats)); |
| } |
| |
| static inline int init_part_stats(struct hd_struct *part) |
| { |
| return 1; |
| } |
| |
| static inline void free_part_stats(struct hd_struct *part) |
| { |
| } |
| |
| #endif /* CONFIG_SMP */ |
| |
| #define part_stat_add(cpu, part, field, addnd) do { \ |
| __part_stat_add((cpu), (part), field, addnd); \ |
| if ((part)->partno) \ |
| __part_stat_add((cpu), &part_to_disk((part))->part0, \ |
| field, addnd); \ |
| } while (0) |
| |
| #define part_stat_dec(cpu, gendiskp, field) \ |
| part_stat_add(cpu, gendiskp, field, -1) |
| #define part_stat_inc(cpu, gendiskp, field) \ |
| part_stat_add(cpu, gendiskp, field, 1) |
| #define part_stat_sub(cpu, gendiskp, field, subnd) \ |
| part_stat_add(cpu, gendiskp, field, -subnd) |
| |
| static inline void part_inc_in_flight(struct hd_struct *part, int rw) |
| { |
| atomic_inc(&part->in_flight[rw]); |
| if (part->partno) |
| atomic_inc(&part_to_disk(part)->part0.in_flight[rw]); |
| } |
| |
| static inline void part_dec_in_flight(struct hd_struct *part, int rw) |
| { |
| atomic_dec(&part->in_flight[rw]); |
| if (part->partno) |
| atomic_dec(&part_to_disk(part)->part0.in_flight[rw]); |
| } |
| |
| static inline int part_in_flight(struct hd_struct *part) |
| { |
| return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]); |
| } |
| |
| static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
| { |
| if (disk) |
| return kzalloc_node(sizeof(struct partition_meta_info), |
| GFP_KERNEL, disk->node_id); |
| return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); |
| } |
| |
| static inline void free_part_info(struct hd_struct *part) |
| { |
| kfree(part->info); |
| } |
| |
| /* block/blk-core.c */ |
| extern void part_round_stats(int cpu, struct hd_struct *part); |
| |
| /* block/genhd.c */ |
| extern void add_disk(struct gendisk *disk); |
| extern void del_gendisk(struct gendisk *gp); |
| extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
| extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
| |
| extern void set_device_ro(struct block_device *bdev, int flag); |
| extern void set_disk_ro(struct gendisk *disk, int flag); |
| |
| static inline int get_disk_ro(struct gendisk *disk) |
| { |
| return disk->part0.policy; |
| } |
| |
| extern void disk_block_events(struct gendisk *disk); |
| extern void disk_unblock_events(struct gendisk *disk); |
| extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
| extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
| |
| /* 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_part->start_sect; |
| } |
| static inline sector_t get_capacity(struct gendisk *disk) |
| { |
| return disk->part0.nr_sects; |
| } |
| static inline void set_capacity(struct gendisk *disk, sector_t size) |
| { |
| disk->part0.nr_sects = size; |
| } |
| |
| #ifdef CONFIG_SOLARIS_X86_PARTITION |
| |
| #define SOLARIS_X86_NUMSLICE 16 |
| #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 */ |
| |
| #define ADDPART_FLAG_NONE 0 |
| #define ADDPART_FLAG_RAID 1 |
| #define ADDPART_FLAG_WHOLEDISK 2 |
| |
| extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
| extern void blk_free_devt(dev_t devt); |
| extern dev_t blk_lookup_devt(const char *name, int partno); |
| extern char *disk_name (struct gendisk *hd, int partno, char *buf); |
| |
| extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
| extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
| extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); |
| extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
| int partno, sector_t start, |
| sector_t len, int flags, |
| struct partition_meta_info |
| *info); |
| extern void __delete_partition(struct hd_struct *); |
| extern void delete_partition(struct gendisk *, int); |
| extern void printk_all_partitions(void); |
| |
| extern struct gendisk *alloc_disk_node(int minors, int node_id); |
| 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 devt, 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 devt, unsigned long range); |
| |
| extern ssize_t part_size_show(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t part_stat_show(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t part_inflight_show(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| #ifdef CONFIG_FAIL_MAKE_REQUEST |
| extern ssize_t part_fail_show(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t part_fail_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count); |
| #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
| |
| static inline void hd_ref_init(struct hd_struct *part) |
| { |
| atomic_set(&part->ref, 1); |
| smp_mb(); |
| } |
| |
| static inline void hd_struct_get(struct hd_struct *part) |
| { |
| atomic_inc(&part->ref); |
| smp_mb__after_atomic_inc(); |
| } |
| |
| static inline int hd_struct_try_get(struct hd_struct *part) |
| { |
| return atomic_inc_not_zero(&part->ref); |
| } |
| |
| static inline void hd_struct_put(struct hd_struct *part) |
| { |
| if (atomic_dec_and_test(&part->ref)) |
| __delete_partition(part); |
| } |
| |
| /* |
| * Any access of part->nr_sects which is not protected by partition |
| * bd_mutex or gendisk bdev bd_mutex, should be done using this |
| * accessor function. |
| * |
| * Code written along the lines of i_size_read() and i_size_write(). |
| * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption |
| * on. |
| */ |
| static inline sector_t part_nr_sects_read(struct hd_struct *part) |
| { |
| #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) |
| sector_t nr_sects; |
| unsigned seq; |
| do { |
| seq = read_seqcount_begin(&part->nr_sects_seq); |
| nr_sects = part->nr_sects; |
| } while (read_seqcount_retry(&part->nr_sects_seq, seq)); |
| return nr_sects; |
| #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) |
| sector_t nr_sects; |
| |
| preempt_disable(); |
| nr_sects = part->nr_sects; |
| preempt_enable(); |
| return nr_sects; |
| #else |
| return part->nr_sects; |
| #endif |
| } |
| |
| /* |
| * Should be called with mutex lock held (typically bd_mutex) of partition |
| * to provide mutual exlusion among writers otherwise seqcount might be |
| * left in wrong state leaving the readers spinning infinitely. |
| */ |
| static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) |
| { |
| #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) |
| write_seqcount_begin(&part->nr_sects_seq); |
| part->nr_sects = size; |
| write_seqcount_end(&part->nr_sects_seq); |
| #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) |
| preempt_disable(); |
| part->nr_sects = size; |
| preempt_enable(); |
| #else |
| part->nr_sects = size; |
| #endif |
| } |
| |
| #else /* CONFIG_BLOCK */ |
| |
| static inline void printk_all_partitions(void) { } |
| |
| static inline dev_t blk_lookup_devt(const char *name, int partno) |
| { |
| dev_t devt = MKDEV(0, 0); |
| return devt; |
| } |
| |
| #endif /* CONFIG_BLOCK */ |
| |
| #endif /* _LINUX_GENHD_H */ |