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[PATCH] dm: add exports
Move definitions of core device-mapper functions for manipulating mapped devices and their tables to <linux/device-mapper.h> advertising their availability for use elsewhere in the kernel. Protect the contents of device-mapper.h with ifdef __KERNEL__. And throw in a few formatting clean-ups and extra comments. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alasdair G Kergon
Linus Torvalds
parent
2b06cfff12
commit
17b2f66f2a
@ -50,9 +50,9 @@ struct target_io {
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union map_info *dm_get_mapinfo(struct bio *bio)
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{
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if (bio && bio->bi_private)
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return &((struct target_io *)bio->bi_private)->info;
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return NULL;
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if (bio && bio->bi_private)
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return &((struct target_io *)bio->bi_private)->info;
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return NULL;
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}
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#define MINOR_ALLOCED ((void *)-1)
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@ -474,8 +474,8 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
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if (r > 0) {
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/* the bio has been remapped so dispatch it */
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blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone,
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tio->io->bio->bi_bdev->bd_dev, sector,
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blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone,
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tio->io->bio->bi_bdev->bd_dev, sector,
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clone->bi_sector);
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generic_make_request(clone);
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@ -1042,7 +1042,7 @@ static struct mapped_device *dm_find_md(dev_t dev)
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md = idr_find(&_minor_idr, minor);
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if (md && (md == MINOR_ALLOCED ||
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(dm_disk(md)->first_minor != minor) ||
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test_bit(DMF_FREEING, &md->flags))) {
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test_bit(DMF_FREEING, &md->flags))) {
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md = NULL;
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goto out;
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}
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@ -39,88 +39,16 @@ struct dm_dev {
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};
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struct dm_table;
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struct mapped_device;
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/*-----------------------------------------------------------------
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* Functions for manipulating a struct mapped_device.
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* Drop the reference with dm_put when you finish with the object.
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* Internal table functions.
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*---------------------------------------------------------------*/
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/*
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* DM_ANY_MINOR allocates any available minor number.
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*/
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#define DM_ANY_MINOR (-1)
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int dm_create(int minor, struct mapped_device **md);
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void dm_set_mdptr(struct mapped_device *md, void *ptr);
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void *dm_get_mdptr(struct mapped_device *md);
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/*
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* Reference counting for md.
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*/
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void dm_get(struct mapped_device *md);
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struct mapped_device *dm_get_md(dev_t dev);
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void dm_put(struct mapped_device *md);
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/*
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* A device can still be used while suspended, but I/O is deferred.
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*/
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int dm_suspend(struct mapped_device *md, int with_lockfs);
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int dm_resume(struct mapped_device *md);
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/*
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* The device must be suspended before calling this method.
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*/
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int dm_swap_table(struct mapped_device *md, struct dm_table *t);
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/*
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* Drop a reference on the table when you've finished with the
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* result.
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*/
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struct dm_table *dm_get_table(struct mapped_device *md);
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/*
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* Event functions.
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*/
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uint32_t dm_get_event_nr(struct mapped_device *md);
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int dm_wait_event(struct mapped_device *md, int event_nr);
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/*
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* Info functions.
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*/
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struct gendisk *dm_disk(struct mapped_device *md);
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int dm_suspended(struct mapped_device *md);
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/*
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* Geometry functions.
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*/
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int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo);
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int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);
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/*-----------------------------------------------------------------
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* Functions for manipulating a table. Tables are also reference
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* counted.
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*---------------------------------------------------------------*/
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int dm_table_create(struct dm_table **result, int mode,
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unsigned num_targets, struct mapped_device *md);
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void dm_table_get(struct dm_table *t);
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void dm_table_put(struct dm_table *t);
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int dm_table_add_target(struct dm_table *t, const char *type,
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sector_t start, sector_t len, char *params);
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int dm_table_complete(struct dm_table *t);
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void dm_table_event_callback(struct dm_table *t,
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void (*fn)(void *), void *context);
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void dm_table_event(struct dm_table *t);
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sector_t dm_table_get_size(struct dm_table *t);
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struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
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struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
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void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
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unsigned int dm_table_get_num_targets(struct dm_table *t);
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struct list_head *dm_table_get_devices(struct dm_table *t);
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int dm_table_get_mode(struct dm_table *t);
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struct mapped_device *dm_table_get_md(struct dm_table *t);
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void dm_table_presuspend_targets(struct dm_table *t);
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void dm_table_postsuspend_targets(struct dm_table *t);
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void dm_table_resume_targets(struct dm_table *t);
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@ -138,7 +66,6 @@ void dm_put_target_type(struct target_type *t);
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int dm_target_iterate(void (*iter_func)(struct target_type *tt,
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void *param), void *param);
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/*-----------------------------------------------------------------
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* Useful inlines.
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*---------------------------------------------------------------*/
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@ -8,9 +8,12 @@
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#ifndef _LINUX_DEVICE_MAPPER_H
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#define _LINUX_DEVICE_MAPPER_H
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#ifdef __KERNEL__
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struct dm_target;
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struct dm_table;
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struct dm_dev;
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struct mapped_device;
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typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
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@ -78,7 +81,7 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d);
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struct target_type {
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const char *name;
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struct module *module;
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unsigned version[3];
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unsigned version[3];
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dm_ctr_fn ctr;
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dm_dtr_fn dtr;
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dm_map_fn map;
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@ -128,4 +131,101 @@ struct dm_target {
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int dm_register_target(struct target_type *t);
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int dm_unregister_target(struct target_type *t);
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#endif /* _LINUX_DEVICE_MAPPER_H */
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/*-----------------------------------------------------------------
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* Functions for creating and manipulating mapped devices.
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* Drop the reference with dm_put when you finish with the object.
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*---------------------------------------------------------------*/
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/*
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* DM_ANY_MINOR chooses the next available minor number.
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*/
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#define DM_ANY_MINOR (-1)
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int dm_create(int minor, struct mapped_device **md);
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/*
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* Reference counting for md.
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*/
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struct mapped_device *dm_get_md(dev_t dev);
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void dm_get(struct mapped_device *md);
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void dm_put(struct mapped_device *md);
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/*
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* An arbitrary pointer may be stored alongside a mapped device.
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*/
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void dm_set_mdptr(struct mapped_device *md, void *ptr);
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void *dm_get_mdptr(struct mapped_device *md);
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/*
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* A device can still be used while suspended, but I/O is deferred.
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*/
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int dm_suspend(struct mapped_device *md, int with_lockfs);
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int dm_resume(struct mapped_device *md);
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/*
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* Event functions.
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*/
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uint32_t dm_get_event_nr(struct mapped_device *md);
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int dm_wait_event(struct mapped_device *md, int event_nr);
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/*
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* Info functions.
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*/
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struct gendisk *dm_disk(struct mapped_device *md);
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int dm_suspended(struct mapped_device *md);
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/*
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* Geometry functions.
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*/
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int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo);
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int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);
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/*-----------------------------------------------------------------
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* Functions for manipulating device-mapper tables.
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*---------------------------------------------------------------*/
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/*
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* First create an empty table.
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*/
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int dm_table_create(struct dm_table **result, int mode,
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unsigned num_targets, struct mapped_device *md);
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/*
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* Then call this once for each target.
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*/
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int dm_table_add_target(struct dm_table *t, const char *type,
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sector_t start, sector_t len, char *params);
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/*
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* Finally call this to make the table ready for use.
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*/
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int dm_table_complete(struct dm_table *t);
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/*
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* Table reference counting.
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*/
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struct dm_table *dm_get_table(struct mapped_device *md);
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void dm_table_get(struct dm_table *t);
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void dm_table_put(struct dm_table *t);
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/*
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* Queries
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*/
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sector_t dm_table_get_size(struct dm_table *t);
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unsigned int dm_table_get_num_targets(struct dm_table *t);
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int dm_table_get_mode(struct dm_table *t);
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struct mapped_device *dm_table_get_md(struct dm_table *t);
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/*
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* Trigger an event.
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*/
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void dm_table_event(struct dm_table *t);
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/*
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* The device must be suspended before calling this method.
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*/
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int dm_swap_table(struct mapped_device *md, struct dm_table *t);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_DEVICE_MAPPER_H */
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