X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fgenhd.h;h=e439e6aed832f3fc98b3a7944521f108e5740fbb;hb=31d85ab28e71b0c938e0ef48af45747e80d99b53;hp=eabdb5cce357f2770c6b01f2ce4670f8d14e43ce;hpb=6fbfddcb52d8d9fa2cd209f5ac2a1c87497d55b5;p=safe%2Fjmp%2Flinux-2.6 diff --git a/include/linux/genhd.h b/include/linux/genhd.h index eabdb5c..e439e6a 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -9,13 +9,21 @@ * */ -#include #include -#include -#include -#include -#include -#include +#include +#include + +#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 @@ -24,7 +32,11 @@ enum { 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, @@ -43,24 +55,16 @@ enum { 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)); +#define DISK_MAX_PARTS 256 +#define DISK_NAME_LEN 32 -#endif +#include +#include +#include +#include +#include +#include -#ifdef __KERNEL__ struct partition { unsigned char boot_ind; /* 0x80 - active */ unsigned char head; /* starting head */ @@ -74,188 +78,299 @@ struct partition { __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; +}; + struct hd_struct { sector_t start_sect; sector_t nr_sects; - struct kobject kobj; - unsigned reads, read_sectors, writes, write_sectors; + struct device __dev; + struct kobject *holder_dir; int policy, partno; +#ifdef CONFIG_FAIL_MAKE_REQUEST + int make_it_fail; +#endif + unsigned long stamp; + int in_flight; +#ifdef CONFIG_SMP + struct disk_stats *dkstats; +#else + struct disk_stats dkstats; +#endif + struct rcu_head rcu_head; }; #define GENHD_FL_REMOVABLE 1 #define GENHD_FL_DRIVERFS 2 +#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 */ -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; +#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 *part[]; +}; + 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[32]; /* name of major driver */ - struct hd_struct **part; /* [indexed by minor] */ + + char disk_name[DISK_NAME_LEN]; /* name of major driver */ + + /* 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 *part_tbl; + struct hd_struct part0; + 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 device *driverfs_dev; // FIXME: remove + struct kobject *slave_dir; struct timer_rand_state *random; - int policy; atomic_t sync_io; /* RAID */ - unsigned long stamp; - int in_flight; -#ifdef CONFIG_SMP - struct disk_stats *dkstats; -#else - struct disk_stats dkstats; + struct work_struct async_notify; +#ifdef CONFIG_BLK_DEV_INTEGRITY + struct blk_integrity *integrity; #endif + int node_id; }; -/* Structure for sysfs attributes on block devices */ -struct disk_attribute { - struct attribute attr; - ssize_t (*show)(struct gendisk *, char *); - ssize_t (*store)(struct gendisk *, const char *, size_t); +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 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_partitionable(struct gendisk *disk) +{ + return disk_max_parts(disk) > 1; +} + +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 */ + +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: * - * The __ variants should only be called in critical sections. The full - * variants disable/enable preemption. + * {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 __disk_stat_add(gendiskp, field, addnd) \ - (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) +#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 disk_stat_read(gendiskp, field) \ +#define part_stat_read(part, field) \ ({ \ - typeof(gendiskp->dkstats->field) res = 0; \ + typeof((part)->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; \ - } \ + for_each_possible_cpu(i) \ + res += per_cpu_ptr((part)->dkstats, i)->field; \ res; \ }) -static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { +static inline void part_stat_set_all(struct hd_struct *part, 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)); + 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; } -#endif -#define disk_stat_add(gendiskp, field, addnd) \ - do { \ - preempt_disable(); \ - __disk_stat_add(gendiskp, field, addnd); \ - preempt_enable(); \ - } while (0) +static inline void free_part_stats(struct hd_struct *part) +{ + free_percpu(part->dkstats); +} -#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1) -#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) +#else /* !CONFIG_SMP */ +#define part_stat_lock() ({ rcu_read_lock(); 0; }) +#define part_stat_unlock() rcu_read_unlock() -#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 __part_stat_add(cpu, part, field, addnd) \ + ((part)->dkstats.field += addnd) -#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) +#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)); +} -/* Inlines to alloc and free disk stats in struct gendisk */ -#ifdef CONFIG_SMP -static inline int init_disk_stats(struct gendisk *disk) +static inline int init_part_stats(struct hd_struct *part) { - disk->dkstats = alloc_percpu(struct disk_stats); - if (!disk->dkstats) - return 0; return 1; } -static inline void free_disk_stats(struct gendisk *disk) +static inline void free_part_stats(struct hd_struct *part) { - free_percpu(disk->dkstats); } -#else /* CONFIG_SMP */ -static inline int init_disk_stats(struct gendisk *disk) + +#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) { - return 1; + part->in_flight++; + if (part->partno) + part_to_disk(part)->part0.in_flight++; } -static inline void free_disk_stats(struct gendisk *disk) +static inline void part_dec_in_flight(struct hd_struct *part) { + part->in_flight--; + if (part->partno) + part_to_disk(part)->part0.in_flight--; } -#endif /* CONFIG_SMP */ /* drivers/block/ll_rw_blk.c */ -extern void disk_round_stats(struct gendisk *disk); +extern void part_round_stats(int cpu, struct hd_struct *part); /* drivers/block/genhd.c */ extern int get_blkdev_list(char *, int); 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 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; +} + /* 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; + return bdev->bd_part->start_sect; } static inline sector_t get_capacity(struct gendisk *disk) { - return disk->capacity; + return disk->part0.nr_sects; } static inline void set_capacity(struct gendisk *disk, sector_t size) { - disk->capacity = size; + disk->part0.nr_sects = size; } -#endif /* __KERNEL__ */ - #ifdef CONFIG_SOLARIS_X86_PARTITION -#define SOLARIS_X86_NUMSLICE 8 +#define SOLARIS_X86_NUMSLICE 16 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) struct solaris_x86_slice { @@ -396,31 +511,54 @@ struct unixware_disklabel { # define MINIX_NR_SUBPARTITIONS 4 #endif /* CONFIG_MINIX_SUBPARTITION */ -#ifdef __KERNEL__ +#define ADDPART_FLAG_NONE 0 +#define ADDPART_FLAG_RAID 1 +#define ADDPART_FLAG_WHOLEDISK 2 -char *disk_name (struct gendisk *hd, int part, char *buf); +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 void add_partition(struct gendisk *, int, sector_t, sector_t); +extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int); 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 dev, unsigned long range, +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 dev, unsigned long range); +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); +#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 */ + +#else /* CONFIG_BLOCK */ -static inline struct block_device *bdget_disk(struct gendisk *disk, int index) +static inline void printk_all_partitions(void) { } + +static inline dev_t blk_lookup_devt(const char *name, int partno) { - return bdget(MKDEV(disk->major, disk->first_minor) + index); + dev_t devt = MKDEV(0, 0); + return devt; } -#endif +#endif /* CONFIG_BLOCK */ -#endif +#endif /* _LINUX_GENHD_H */