X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fmd%2Fdm.h;h=e71b22dec98c50cd86add45cf2fa693725333484;hb=refs%2Fheads%2Fvserver;hp=34bf0e7cceb29c90633560e2b8dd1cea21dd24b5;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 34bf0e7cc..e71b22dec 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -2,6 +2,7 @@ * Internal header file for device mapper * * Copyright (C) 2001, 2002 Sistina Software + * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. */ @@ -13,110 +14,72 @@ #include #include #include +#include #define DM_NAME "device-mapper" -#define DMWARN(f, x...) printk(KERN_WARNING DM_NAME ": " f "\n" , ## x) -#define DMERR(f, x...) printk(KERN_ERR DM_NAME ": " f "\n" , ## x) -#define DMINFO(f, x...) printk(KERN_INFO DM_NAME ": " f "\n" , ## x) -/* - * FIXME: I think this should be with the definition of sector_t - * in types.h. - */ -#ifdef CONFIG_LBD -#define SECTOR_FORMAT "%Lu" +#define DMERR(f, arg...) printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) +#define DMWARN(f, arg...) printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) +#define DMINFO(f, arg...) printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) +#ifdef CONFIG_DM_DEBUG +# define DMDEBUG(f, arg...) printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg) #else -#define SECTOR_FORMAT "%lu" +# define DMDEBUG(f, arg...) do {} while (0) #endif -#define SECTOR_SHIFT 9 - -extern struct block_device_operations dm_blk_dops; +#define DMEMIT(x...) sz += ((sz >= maxlen) ? \ + 0 : scnprintf(result + sz, maxlen - sz, x)) -/* - * List of devices that a metadevice uses and should open/close. - */ -struct dm_dev { - struct list_head list; - - atomic_t count; - int mode; - struct block_device *bdev; -}; - -struct dm_table; -struct mapped_device; - -/*----------------------------------------------------------------- - * Functions for manipulating a struct mapped_device. - * Drop the reference with dm_put when you finish with the object. - *---------------------------------------------------------------*/ -int dm_create(struct mapped_device **md); -int dm_create_with_minor(unsigned int minor, struct mapped_device **md); +#define SECTOR_SHIFT 9 /* - * Reference counting for md. + * Definitions of return values from target end_io function. */ -void dm_get(struct mapped_device *md); -void dm_put(struct mapped_device *md); +#define DM_ENDIO_INCOMPLETE 1 +#define DM_ENDIO_REQUEUE 2 /* - * A device can still be used while suspended, but I/O is deferred. + * Definitions of return values from target map function. */ -int dm_suspend(struct mapped_device *md); -int dm_resume(struct mapped_device *md); +#define DM_MAPIO_SUBMITTED 0 +#define DM_MAPIO_REMAPPED 1 +#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE /* - * The device must be suspended before calling this method. + * Suspend feature flags */ -int dm_swap_table(struct mapped_device *md, struct dm_table *t); +#define DM_SUSPEND_LOCKFS_FLAG (1 << 0) +#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) /* - * Drop a reference on the table when you've finished with the - * result. + * List of devices that a metadevice uses and should open/close. */ -struct dm_table *dm_get_table(struct mapped_device *md); +struct dm_dev { + struct list_head list; -/* - * Event functions. - */ -uint32_t dm_get_event_nr(struct mapped_device *md); -int dm_add_wait_queue(struct mapped_device *md, wait_queue_t *wq, - uint32_t event_nr); -void dm_remove_wait_queue(struct mapped_device *md, wait_queue_t *wq); + atomic_t count; + int mode; + struct block_device *bdev; + char name[16]; +}; -/* - * Info functions. - */ -struct gendisk *dm_disk(struct mapped_device *md); -int dm_suspended(struct mapped_device *md); +struct dm_table; /*----------------------------------------------------------------- - * Functions for manipulating a table. Tables are also reference - * counted. + * Internal table functions. *---------------------------------------------------------------*/ -int dm_table_create(struct dm_table **result, int mode, unsigned num_targets); - -void dm_table_get(struct dm_table *t); -void dm_table_put(struct dm_table *t); - -int dm_table_add_target(struct dm_table *t, const char *type, - sector_t start, sector_t len, char *params); -int dm_table_complete(struct dm_table *t); void dm_table_event_callback(struct dm_table *t, void (*fn)(void *), void *context); -void dm_table_event(struct dm_table *t); -sector_t dm_table_get_size(struct dm_table *t); struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q); -unsigned int dm_table_get_num_targets(struct dm_table *t); struct list_head *dm_table_get_devices(struct dm_table *t); -int dm_table_get_mode(struct dm_table *t); -void dm_table_suspend_targets(struct dm_table *t); -void dm_table_resume_targets(struct dm_table *t); +void dm_table_presuspend_targets(struct dm_table *t); +void dm_table_postsuspend_targets(struct dm_table *t); +int dm_table_resume_targets(struct dm_table *t); int dm_table_any_congested(struct dm_table *t, int bdi_bits); void dm_table_unplug_all(struct dm_table *t); +int dm_table_flush_all(struct dm_table *t); /*----------------------------------------------------------------- * A registry of target types. @@ -128,6 +91,7 @@ void dm_put_target_type(struct target_type *t); int dm_target_iterate(void (*iter_func)(struct target_type *tt, void *param), void *param); +xid_t dm_get_xid(struct mapped_device *md); /*----------------------------------------------------------------- * Useful inlines. @@ -139,21 +103,22 @@ static inline int array_too_big(unsigned long fixed, unsigned long obj, } /* - * ceiling(n / size) * size + * Ceiling(n / sz) */ -static inline unsigned long dm_round_up(unsigned long n, unsigned long size) -{ - unsigned long r = n % size; - return n + (r ? (size - r) : 0); -} +#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) + +#define dm_sector_div_up(n, sz) ( \ +{ \ + sector_t _r = ((n) + (sz) - 1); \ + sector_div(_r, (sz)); \ + _r; \ +} \ +) /* - * Ceiling(n / size) + * ceiling(n / size) * size */ -static inline unsigned long dm_div_up(unsigned long n, unsigned long size) -{ - return dm_round_up(n, size) / size; -} +#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) static inline sector_t to_sector(unsigned long n) { @@ -165,6 +130,8 @@ static inline unsigned long to_bytes(sector_t n) return (n << 9); } +int dm_split_args(int *argc, char ***argvp, char *input); + /* * The device-mapper can be driven through one of two interfaces; * ioctl or filesystem, depending which patch you have applied. @@ -182,5 +149,8 @@ int dm_stripe_init(void); void dm_stripe_exit(void); void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); +union map_info *dm_get_mapinfo(struct bio *bio); +int dm_open_count(struct mapped_device *md); +int dm_lock_for_deletion(struct mapped_device *md); #endif