X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fmd%2Fdm.h;h=23278ae80f08dfc90c8458a3b6a700e4a2a87f8b;hb=2ea472ff704a8a94b3b9abec438db23e512be337;hp=e38c3fc1a1db451aec5b3172b27b22c7042c384c;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/md/dm.h b/drivers/md/dm.h index e38c3fc..23278ae 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -2,7 +2,7 @@ * Internal header file for device mapper * * Copyright (C) 2001, 2002 Sistina Software - * Copyright (C) 2004 Red Hat, Inc. All rights reserved. + * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. */ @@ -14,114 +14,68 @@ #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) - -#define DMEMIT(x...) sz += ((sz >= maxlen) ? \ - 0 : scnprintf(result + sz, maxlen - sz, x)) +#include /* - * FIXME: I think this should be with the definition of sector_t - * in types.h. + * Suspend feature flags */ -#ifdef CONFIG_LBD -#define SECTOR_FORMAT "%Lu" -#else -#define SECTOR_FORMAT "%lu" -#endif +#define DM_SUSPEND_LOCKFS_FLAG (1 << 0) +#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) -#define SECTOR_SHIFT 9 +/* + * Type of table and mapped_device's mempool + */ +#define DM_TYPE_NONE 0 +#define DM_TYPE_BIO_BASED 1 +#define DM_TYPE_REQUEST_BASED 2 /* * List of devices that a metadevice uses and should open/close. */ -struct dm_dev { +struct dm_dev_internal { struct list_head list; - atomic_t count; - int mode; - struct block_device *bdev; - char name[16]; + struct dm_dev dm_dev; }; 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); -void dm_set_mdptr(struct mapped_device *md, void *ptr); -void *dm_get_mdptr(dev_t dev); - -/* - * Reference counting for md. - */ -void dm_get(struct mapped_device *md); -void dm_put(struct mapped_device *md); - -/* - * A device can still be used while suspended, but I/O is deferred. - */ -int dm_suspend(struct mapped_device *md); -int dm_resume(struct mapped_device *md); - -/* - * The device must be suspended before calling this method. - */ -int dm_swap_table(struct mapped_device *md, struct dm_table *t); - -/* - * Drop a reference on the table when you've finished with the - * result. - */ -struct dm_table *dm_get_table(struct mapped_device *md); - -/* - * Event functions. - */ -uint32_t dm_get_event_nr(struct mapped_device *md); -int dm_wait_event(struct mapped_device *md, int event_nr); - -/* - * Info functions. - */ -struct gendisk *dm_disk(struct mapped_device *md); -int dm_suspended(struct mapped_device *md); +struct dm_md_mempools; /*----------------------------------------------------------------- - * 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_destroy(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); +int dm_calculate_queue_limits(struct dm_table *table, + struct queue_limits *limits); +void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, + struct queue_limits *limits); struct list_head *dm_table_get_devices(struct dm_table *t); -int dm_table_get_mode(struct dm_table *t); void dm_table_presuspend_targets(struct dm_table *t); void dm_table_postsuspend_targets(struct dm_table *t); -void dm_table_resume_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); +int dm_table_any_busy_target(struct dm_table *t); +int dm_table_set_type(struct dm_table *t); +unsigned dm_table_get_type(struct dm_table *t); +bool dm_table_bio_based(struct dm_table *t); +bool dm_table_request_based(struct dm_table *t); +int dm_table_alloc_md_mempools(struct dm_table *t); +void dm_table_free_md_mempools(struct dm_table *t); +struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); + +/* + * To check the return value from dm_table_find_target(). + */ +#define dm_target_is_valid(t) ((t)->table) + +/* + * To check whether the target type is request-based or not (bio-based). + */ +#define dm_target_request_based(t) ((t)->type->map_rq != NULL) /*----------------------------------------------------------------- * A registry of target types. @@ -129,48 +83,10 @@ int dm_table_flush_all(struct dm_table *t); int dm_target_init(void); void dm_target_exit(void); struct target_type *dm_get_target_type(const char *name); -void dm_put_target_type(struct target_type *t); +void dm_put_target_type(struct target_type *tt); int dm_target_iterate(void (*iter_func)(struct target_type *tt, void *param), void *param); - -/*----------------------------------------------------------------- - * Useful inlines. - *---------------------------------------------------------------*/ -static inline int array_too_big(unsigned long fixed, unsigned long obj, - unsigned long num) -{ - return (num > (ULONG_MAX - fixed) / obj); -} - -/* - * Ceiling(n / sz) - */ -#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) * size - */ -#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) - -static inline sector_t to_sector(unsigned long n) -{ - return (n >> 9); -} - -static inline unsigned long to_bytes(sector_t n) -{ - return (n << 9); -} - int dm_split_args(int *argc, char ***argvp, char *input); /* @@ -181,6 +97,14 @@ int dm_interface_init(void); void dm_interface_exit(void); /* + * sysfs interface + */ +int dm_sysfs_init(struct mapped_device *md); +void dm_sysfs_exit(struct mapped_device *md); +struct kobject *dm_kobject(struct mapped_device *md); +struct mapped_device *dm_get_from_kobject(struct kobject *kobj); + +/* * Targets for linear and striped mappings */ int dm_linear_init(void); @@ -189,7 +113,19 @@ void dm_linear_exit(void); 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); + +void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, + unsigned cookie); + +int dm_kcopyd_init(void); +void dm_kcopyd_exit(void); + +/* + * Mempool operations + */ +struct dm_md_mempools *dm_alloc_md_mempools(unsigned type); +void dm_free_md_mempools(struct dm_md_mempools *pools); #endif