diff options
Diffstat (limited to 'drivers/md/dm.h')
| -rw-r--r-- | drivers/md/dm.h | 248 |
1 files changed, 138 insertions, 110 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h index e38c3fc1a1d..ed76126aac5 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 +14,98 @@ #include <linux/device-mapper.h> #include <linux/list.h> #include <linux/blkdev.h> +#include <linux/hdreg.h> +#include <linux/completion.h> +#include <linux/kobject.h> -#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) +#include "dm-stats.h" -#define DMEMIT(x...) sz += ((sz >= maxlen) ? \ - 0 : scnprintf(result + sz, maxlen - sz, x)) +/* + * Suspend feature flags + */ +#define DM_SUSPEND_LOCKFS_FLAG (1 << 0) +#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) /* - * FIXME: I think this should be with the definition of sector_t - * in types.h. + * Status feature flags */ -#ifdef CONFIG_LBD -#define SECTOR_FORMAT "%Lu" -#else -#define SECTOR_FORMAT "%lu" -#endif +#define DM_STATUS_NOFLUSH_FLAG (1 << 0) -#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; +struct dm_md_mempools; /*----------------------------------------------------------------- - * Functions for manipulating a struct mapped_device. - * Drop the reference with dm_put when you finish with the object. + * Internal table functions. *---------------------------------------------------------------*/ -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); +void dm_table_destroy(struct dm_table *t); +void dm_table_event_callback(struct dm_table *t, + void (*fn)(void *), void *context); +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); +bool dm_table_has_no_data_devices(struct dm_table *table); +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); +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); +int dm_table_any_busy_target(struct dm_table *t); +unsigned dm_table_get_type(struct dm_table *t); +struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); +bool dm_table_request_based(struct dm_table *t); +bool dm_table_supports_discards(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); -/* - * Reference counting for md. - */ -void dm_get(struct mapped_device *md); -void dm_put(struct mapped_device *md); +int dm_queue_merge_is_compulsory(struct request_queue *q); -/* - * 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); +void dm_lock_md_type(struct mapped_device *md); +void dm_unlock_md_type(struct mapped_device *md); +void dm_set_md_type(struct mapped_device *md, unsigned type); +unsigned dm_get_md_type(struct mapped_device *md); +struct target_type *dm_get_immutable_target_type(struct mapped_device *md); + +int dm_setup_md_queue(struct mapped_device *md); /* - * The device must be suspended before calling this method. + * To check the return value from dm_table_find_target(). */ -int dm_swap_table(struct mapped_device *md, struct dm_table *t); +#define dm_target_is_valid(t) ((t)->table) /* - * Drop a reference on the table when you've finished with the - * result. + * To check whether the target type is bio-based or not (request-based). */ -struct dm_table *dm_get_table(struct mapped_device *md); +#define dm_target_bio_based(t) ((t)->type->map != NULL) /* - * Event functions. + * To check whether the target type is request-based or not (bio-based). */ -uint32_t dm_get_event_nr(struct mapped_device *md); -int dm_wait_event(struct mapped_device *md, int event_nr); +#define dm_target_request_based(t) ((t)->type->map_rq != NULL) /* - * Info functions. + * To check whether the target type is a hybrid (capable of being + * either request-based or bio-based). */ -struct gendisk *dm_disk(struct mapped_device *md); -int dm_suspended(struct mapped_device *md); - -/*----------------------------------------------------------------- - * Functions for manipulating a table. Tables are also reference - * counted. - *---------------------------------------------------------------*/ -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_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_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); +#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t)) /*----------------------------------------------------------------- * A registry of target types. @@ -129,56 +113,61 @@ 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); +int dm_split_args(int *argc, char ***argvp, char *input); -/*----------------------------------------------------------------- - * Useful inlines. - *---------------------------------------------------------------*/ -static inline int array_too_big(unsigned long fixed, unsigned long obj, - unsigned long num) -{ - return (num > (ULONG_MAX - fixed) / obj); -} +/* + * Is this mapped_device being deleted? + */ +int dm_deleting_md(struct mapped_device *md); /* - * Ceiling(n / sz) + * Is this mapped_device suspended? */ -#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) +int dm_suspended_md(struct mapped_device *md); -#define dm_sector_div_up(n, sz) ( \ -{ \ - sector_t _r = ((n) + (sz) - 1); \ - sector_div(_r, (sz)); \ - _r; \ -} \ -) +/* + * Test if the device is scheduled for deferred remove. + */ +int dm_test_deferred_remove_flag(struct mapped_device *md); /* - * ceiling(n / size) * size + * Try to remove devices marked for deferred removal. */ -#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) +void dm_deferred_remove(void); -static inline sector_t to_sector(unsigned long n) -{ - return (n >> 9); -} +/* + * The device-mapper can be driven through one of two interfaces; + * ioctl or filesystem, depending which patch you have applied. + */ +int dm_interface_init(void); +void dm_interface_exit(void); -static inline unsigned long to_bytes(sector_t n) +/* + * sysfs interface + */ +struct dm_kobject_holder { + struct kobject kobj; + struct completion completion; +}; + +static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj) { - return (n << 9); + return &container_of(kobj, struct dm_kobject_holder, kobj)->completion; } -int dm_split_args(int *argc, char ***argvp, char *input); +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); /* - * The device-mapper can be driven through one of two interfaces; - * ioctl or filesystem, depending which patch you have applied. + * The kobject helper */ -int dm_interface_init(void); -void dm_interface_exit(void); +void dm_kobject_release(struct kobject *kobj); /* * Targets for linear and striped mappings @@ -189,7 +178,46 @@ 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); +/* + * mapped_device operations + */ +void dm_destroy(struct mapped_device *md); +void dm_destroy_immediate(struct mapped_device *md); +int dm_open_count(struct mapped_device *md); +int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred); +int dm_cancel_deferred_remove(struct mapped_device *md); +int dm_request_based(struct mapped_device *md); +sector_t dm_get_size(struct mapped_device *md); +struct request_queue *dm_get_md_queue(struct mapped_device *md); +struct dm_stats *dm_get_stats(struct mapped_device *md); + +int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, + unsigned cookie); + +void dm_internal_suspend(struct mapped_device *md); +void dm_internal_resume(struct mapped_device *md); + +int dm_io_init(void); +void dm_io_exit(void); + +int dm_kcopyd_init(void); +void dm_kcopyd_exit(void); + +/* + * Mempool operations + */ +struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size); +void dm_free_md_mempools(struct dm_md_mempools *pools); + +/* + * Helpers that are used by DM core + */ +unsigned dm_get_reserved_bio_based_ios(void); +unsigned dm_get_reserved_rq_based_ios(void); + +static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen) +{ + return !maxlen || strlen(result) + 1 >= maxlen; +} #endif |