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663 lines
19 KiB
663 lines
19 KiB
/* |
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* Copyright (C) 2001 Sistina Software (UK) Limited. |
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
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* |
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* This file is released under the LGPL. |
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*/ |
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|
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#ifndef _LINUX_DEVICE_MAPPER_H |
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#define _LINUX_DEVICE_MAPPER_H |
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|
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#include <linux/bio.h> |
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#include <linux/blkdev.h> |
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#include <linux/dm-ioctl.h> |
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#include <linux/math64.h> |
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#include <linux/ratelimit.h> |
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struct dm_dev; |
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struct dm_target; |
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struct dm_table; |
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struct dm_report_zones_args; |
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struct mapped_device; |
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struct bio_vec; |
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|
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/* |
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* Type of table, mapped_device's mempool and request_queue |
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*/ |
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enum dm_queue_mode { |
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DM_TYPE_NONE = 0, |
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DM_TYPE_BIO_BASED = 1, |
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DM_TYPE_REQUEST_BASED = 2, |
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DM_TYPE_DAX_BIO_BASED = 3, |
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}; |
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typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t; |
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union map_info { |
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void *ptr; |
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}; |
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/* |
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* In the constructor the target parameter will already have the |
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* table, type, begin and len fields filled in. |
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*/ |
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typedef int (*dm_ctr_fn) (struct dm_target *target, |
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unsigned int argc, char **argv); |
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/* |
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* The destructor doesn't need to free the dm_target, just |
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* anything hidden ti->private. |
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*/ |
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typedef void (*dm_dtr_fn) (struct dm_target *ti); |
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/* |
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* The map function must return: |
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* < 0: error |
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* = 0: The target will handle the io by resubmitting it later |
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* = 1: simple remap complete |
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* = 2: The target wants to push back the io |
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*/ |
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typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); |
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typedef int (*dm_clone_and_map_request_fn) (struct dm_target *ti, |
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struct request *rq, |
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union map_info *map_context, |
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struct request **clone); |
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typedef void (*dm_release_clone_request_fn) (struct request *clone, |
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union map_info *map_context); |
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/* |
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* Returns: |
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* < 0 : error (currently ignored) |
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* 0 : ended successfully |
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* 1 : for some reason the io has still not completed (eg, |
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* multipath target might want to requeue a failed io). |
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* 2 : The target wants to push back the io |
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*/ |
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typedef int (*dm_endio_fn) (struct dm_target *ti, |
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struct bio *bio, blk_status_t *error); |
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typedef int (*dm_request_endio_fn) (struct dm_target *ti, |
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struct request *clone, blk_status_t error, |
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union map_info *map_context); |
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typedef void (*dm_presuspend_fn) (struct dm_target *ti); |
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typedef void (*dm_presuspend_undo_fn) (struct dm_target *ti); |
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typedef void (*dm_postsuspend_fn) (struct dm_target *ti); |
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typedef int (*dm_preresume_fn) (struct dm_target *ti); |
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typedef void (*dm_resume_fn) (struct dm_target *ti); |
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typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type, |
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unsigned status_flags, char *result, unsigned maxlen); |
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typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv, |
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char *result, unsigned maxlen); |
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typedef int (*dm_prepare_ioctl_fn) (struct dm_target *ti, struct block_device **bdev); |
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#ifdef CONFIG_BLK_DEV_ZONED |
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typedef int (*dm_report_zones_fn) (struct dm_target *ti, |
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struct dm_report_zones_args *args, |
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unsigned int nr_zones); |
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#else |
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/* |
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* Define dm_report_zones_fn so that targets can assign to NULL if |
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* CONFIG_BLK_DEV_ZONED disabled. Otherwise each target needs to do |
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* awkward #ifdefs in their target_type, etc. |
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*/ |
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typedef int (*dm_report_zones_fn) (struct dm_target *dummy); |
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#endif |
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/* |
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* These iteration functions are typically used to check (and combine) |
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* properties of underlying devices. |
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* E.g. Does at least one underlying device support flush? |
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* Does any underlying device not support WRITE_SAME? |
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* |
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* The callout function is called once for each contiguous section of |
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* an underlying device. State can be maintained in *data. |
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* Return non-zero to stop iterating through any further devices. |
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*/ |
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typedef int (*iterate_devices_callout_fn) (struct dm_target *ti, |
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struct dm_dev *dev, |
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sector_t start, sector_t len, |
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void *data); |
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/* |
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* This function must iterate through each section of device used by the |
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* target until it encounters a non-zero return code, which it then returns. |
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* Returns zero if no callout returned non-zero. |
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*/ |
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typedef int (*dm_iterate_devices_fn) (struct dm_target *ti, |
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iterate_devices_callout_fn fn, |
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void *data); |
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typedef void (*dm_io_hints_fn) (struct dm_target *ti, |
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struct queue_limits *limits); |
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/* |
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* Returns: |
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* 0: The target can handle the next I/O immediately. |
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* 1: The target can't handle the next I/O immediately. |
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*/ |
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typedef int (*dm_busy_fn) (struct dm_target *ti); |
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/* |
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* Returns: |
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* < 0 : error |
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* >= 0 : the number of bytes accessible at the address |
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*/ |
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typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff, |
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long nr_pages, void **kaddr, pfn_t *pfn); |
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typedef size_t (*dm_dax_copy_iter_fn)(struct dm_target *ti, pgoff_t pgoff, |
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void *addr, size_t bytes, struct iov_iter *i); |
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typedef int (*dm_dax_zero_page_range_fn)(struct dm_target *ti, pgoff_t pgoff, |
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size_t nr_pages); |
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#define PAGE_SECTORS (PAGE_SIZE / 512) |
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void dm_error(const char *message); |
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struct dm_dev { |
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struct block_device *bdev; |
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struct dax_device *dax_dev; |
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fmode_t mode; |
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char name[16]; |
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}; |
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dev_t dm_get_dev_t(const char *path); |
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/* |
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* Constructors should call these functions to ensure destination devices |
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* are opened/closed correctly. |
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*/ |
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int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, |
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struct dm_dev **result); |
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void dm_put_device(struct dm_target *ti, struct dm_dev *d); |
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/* |
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* Information about a target type |
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*/ |
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struct target_type { |
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uint64_t features; |
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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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dm_ctr_fn ctr; |
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dm_dtr_fn dtr; |
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dm_map_fn map; |
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dm_clone_and_map_request_fn clone_and_map_rq; |
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dm_release_clone_request_fn release_clone_rq; |
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dm_endio_fn end_io; |
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dm_request_endio_fn rq_end_io; |
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dm_presuspend_fn presuspend; |
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dm_presuspend_undo_fn presuspend_undo; |
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dm_postsuspend_fn postsuspend; |
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dm_preresume_fn preresume; |
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dm_resume_fn resume; |
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dm_status_fn status; |
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dm_message_fn message; |
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dm_prepare_ioctl_fn prepare_ioctl; |
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dm_report_zones_fn report_zones; |
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dm_busy_fn busy; |
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dm_iterate_devices_fn iterate_devices; |
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dm_io_hints_fn io_hints; |
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dm_dax_direct_access_fn direct_access; |
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dm_dax_copy_iter_fn dax_copy_from_iter; |
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dm_dax_copy_iter_fn dax_copy_to_iter; |
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dm_dax_zero_page_range_fn dax_zero_page_range; |
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/* For internal device-mapper use. */ |
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struct list_head list; |
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}; |
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/* |
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* Target features |
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*/ |
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/* |
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* Any table that contains an instance of this target must have only one. |
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*/ |
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#define DM_TARGET_SINGLETON 0x00000001 |
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#define dm_target_needs_singleton(type) ((type)->features & DM_TARGET_SINGLETON) |
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/* |
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* Indicates that a target does not support read-only devices. |
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*/ |
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#define DM_TARGET_ALWAYS_WRITEABLE 0x00000002 |
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#define dm_target_always_writeable(type) \ |
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((type)->features & DM_TARGET_ALWAYS_WRITEABLE) |
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/* |
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* Any device that contains a table with an instance of this target may never |
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* have tables containing any different target type. |
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*/ |
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#define DM_TARGET_IMMUTABLE 0x00000004 |
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#define dm_target_is_immutable(type) ((type)->features & DM_TARGET_IMMUTABLE) |
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/* |
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* Indicates that a target may replace any target; even immutable targets. |
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* .map, .map_rq, .clone_and_map_rq and .release_clone_rq are all defined. |
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*/ |
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#define DM_TARGET_WILDCARD 0x00000008 |
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#define dm_target_is_wildcard(type) ((type)->features & DM_TARGET_WILDCARD) |
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/* |
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* A target implements own bio data integrity. |
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*/ |
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#define DM_TARGET_INTEGRITY 0x00000010 |
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#define dm_target_has_integrity(type) ((type)->features & DM_TARGET_INTEGRITY) |
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/* |
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* A target passes integrity data to the lower device. |
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*/ |
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#define DM_TARGET_PASSES_INTEGRITY 0x00000020 |
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#define dm_target_passes_integrity(type) ((type)->features & DM_TARGET_PASSES_INTEGRITY) |
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/* |
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* Indicates support for zoned block devices: |
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* - DM_TARGET_ZONED_HM: the target also supports host-managed zoned |
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* block devices but does not support combining different zoned models. |
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* - DM_TARGET_MIXED_ZONED_MODEL: the target supports combining multiple |
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* devices with different zoned models. |
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*/ |
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#ifdef CONFIG_BLK_DEV_ZONED |
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#define DM_TARGET_ZONED_HM 0x00000040 |
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#define dm_target_supports_zoned_hm(type) ((type)->features & DM_TARGET_ZONED_HM) |
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#else |
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#define DM_TARGET_ZONED_HM 0x00000000 |
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#define dm_target_supports_zoned_hm(type) (false) |
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#endif |
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/* |
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* A target handles REQ_NOWAIT |
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*/ |
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#define DM_TARGET_NOWAIT 0x00000080 |
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#define dm_target_supports_nowait(type) ((type)->features & DM_TARGET_NOWAIT) |
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/* |
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* A target supports passing through inline crypto support. |
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*/ |
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#define DM_TARGET_PASSES_CRYPTO 0x00000100 |
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#define dm_target_passes_crypto(type) ((type)->features & DM_TARGET_PASSES_CRYPTO) |
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#ifdef CONFIG_BLK_DEV_ZONED |
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#define DM_TARGET_MIXED_ZONED_MODEL 0x00000200 |
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#define dm_target_supports_mixed_zoned_model(type) \ |
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((type)->features & DM_TARGET_MIXED_ZONED_MODEL) |
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#else |
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#define DM_TARGET_MIXED_ZONED_MODEL 0x00000000 |
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#define dm_target_supports_mixed_zoned_model(type) (false) |
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#endif |
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struct dm_target { |
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struct dm_table *table; |
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struct target_type *type; |
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/* target limits */ |
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sector_t begin; |
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sector_t len; |
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/* If non-zero, maximum size of I/O submitted to a target. */ |
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uint32_t max_io_len; |
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/* |
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* A number of zero-length barrier bios that will be submitted |
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* to the target for the purpose of flushing cache. |
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* |
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* The bio number can be accessed with dm_bio_get_target_bio_nr. |
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* It is a responsibility of the target driver to remap these bios |
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* to the real underlying devices. |
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*/ |
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unsigned num_flush_bios; |
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/* |
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* The number of discard bios that will be submitted to the target. |
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* The bio number can be accessed with dm_bio_get_target_bio_nr. |
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*/ |
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unsigned num_discard_bios; |
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/* |
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* The number of secure erase bios that will be submitted to the target. |
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* The bio number can be accessed with dm_bio_get_target_bio_nr. |
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*/ |
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unsigned num_secure_erase_bios; |
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/* |
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* The number of WRITE SAME bios that will be submitted to the target. |
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* The bio number can be accessed with dm_bio_get_target_bio_nr. |
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*/ |
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unsigned num_write_same_bios; |
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/* |
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* The number of WRITE ZEROES bios that will be submitted to the target. |
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* The bio number can be accessed with dm_bio_get_target_bio_nr. |
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*/ |
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unsigned num_write_zeroes_bios; |
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/* |
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* The minimum number of extra bytes allocated in each io for the |
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* target to use. |
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*/ |
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unsigned per_io_data_size; |
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/* target specific data */ |
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void *private; |
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/* Used to provide an error string from the ctr */ |
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char *error; |
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/* |
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* Set if this target needs to receive flushes regardless of |
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* whether or not its underlying devices have support. |
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*/ |
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bool flush_supported:1; |
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/* |
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* Set if this target needs to receive discards regardless of |
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* whether or not its underlying devices have support. |
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*/ |
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bool discards_supported:1; |
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/* |
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* Set if we need to limit the number of in-flight bios when swapping. |
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*/ |
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bool limit_swap_bios:1; |
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}; |
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void *dm_per_bio_data(struct bio *bio, size_t data_size); |
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struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size); |
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unsigned dm_bio_get_target_bio_nr(const struct bio *bio); |
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u64 dm_start_time_ns_from_clone(struct bio *bio); |
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int dm_register_target(struct target_type *t); |
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void dm_unregister_target(struct target_type *t); |
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/* |
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* Target argument parsing. |
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*/ |
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struct dm_arg_set { |
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unsigned argc; |
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char **argv; |
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}; |
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/* |
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* The minimum and maximum value of a numeric argument, together with |
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* the error message to use if the number is found to be outside that range. |
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*/ |
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struct dm_arg { |
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unsigned min; |
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unsigned max; |
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char *error; |
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}; |
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/* |
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* Validate the next argument, either returning it as *value or, if invalid, |
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* returning -EINVAL and setting *error. |
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*/ |
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int dm_read_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set, |
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unsigned *value, char **error); |
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/* |
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* Process the next argument as the start of a group containing between |
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* arg->min and arg->max further arguments. Either return the size as |
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* *num_args or, if invalid, return -EINVAL and set *error. |
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*/ |
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int dm_read_arg_group(const struct dm_arg *arg, struct dm_arg_set *arg_set, |
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unsigned *num_args, char **error); |
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/* |
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* Return the current argument and shift to the next. |
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*/ |
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const char *dm_shift_arg(struct dm_arg_set *as); |
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/* |
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* Move through num_args arguments. |
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*/ |
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void dm_consume_args(struct dm_arg_set *as, unsigned num_args); |
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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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int dm_hold(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, unsigned suspend_flags); |
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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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uint32_t dm_next_uevent_seq(struct mapped_device *md); |
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void dm_uevent_add(struct mapped_device *md, struct list_head *elist); |
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/* |
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* Info functions. |
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*/ |
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const char *dm_device_name(struct mapped_device *md); |
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int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid); |
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struct gendisk *dm_disk(struct mapped_device *md); |
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int dm_suspended(struct dm_target *ti); |
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int dm_post_suspending(struct dm_target *ti); |
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int dm_noflush_suspending(struct dm_target *ti); |
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void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors); |
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union map_info *dm_get_rq_mapinfo(struct request *rq); |
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#ifdef CONFIG_BLK_DEV_ZONED |
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struct dm_report_zones_args { |
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struct dm_target *tgt; |
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sector_t next_sector; |
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void *orig_data; |
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report_zones_cb orig_cb; |
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unsigned int zone_idx; |
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/* must be filled by ->report_zones before calling dm_report_zones_cb */ |
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sector_t start; |
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}; |
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int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data); |
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#endif /* CONFIG_BLK_DEV_ZONED */ |
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/* |
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* Device mapper functions to parse and create devices specified by the |
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* parameter "dm-mod.create=" |
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*/ |
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int __init dm_early_create(struct dm_ioctl *dmi, |
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struct dm_target_spec **spec_array, |
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char **target_params_array); |
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struct queue_limits *dm_get_queue_limits(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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/*----------------------------------------------------------------- |
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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, fmode_t mode, |
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unsigned num_targets, struct mapped_device *md); |
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|
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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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/* |
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* Target can use this to set the table's type. |
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* Can only ever be called from a target's ctr. |
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* Useful for "hybrid" target (supports both bio-based |
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* and request-based). |
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*/ |
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void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type); |
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|
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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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/* |
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* Destroy the table when finished. |
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*/ |
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void dm_table_destroy(struct dm_table *t); |
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|
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/* |
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* Target may require that it is never sent I/O larger than len. |
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*/ |
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int __must_check dm_set_target_max_io_len(struct dm_target *ti, sector_t len); |
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|
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/* |
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* Table reference counting. |
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*/ |
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struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx); |
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void dm_put_live_table(struct mapped_device *md, int srcu_idx); |
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void dm_sync_table(struct mapped_device *md); |
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|
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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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fmode_t 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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const char *dm_table_device_name(struct dm_table *t); |
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|
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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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/* |
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* Run the queue for request-based targets. |
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*/ |
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void dm_table_run_md_queue_async(struct dm_table *t); |
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|
|
/* |
|
* The device must be suspended before calling this method. |
|
* Returns the previous table, which the caller must destroy. |
|
*/ |
|
struct dm_table *dm_swap_table(struct mapped_device *md, |
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struct dm_table *t); |
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|
|
/* |
|
* Table keyslot manager functions |
|
*/ |
|
void dm_destroy_keyslot_manager(struct blk_keyslot_manager *ksm); |
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|
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/* |
|
* A wrapper around vmalloc. |
|
*/ |
|
void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); |
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|
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/*----------------------------------------------------------------- |
|
* Macros. |
|
*---------------------------------------------------------------*/ |
|
#define DM_NAME "device-mapper" |
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|
|
#define DM_FMT(fmt) DM_NAME ": " DM_MSG_PREFIX ": " fmt "\n" |
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|
|
#define DMCRIT(fmt, ...) pr_crit(DM_FMT(fmt), ##__VA_ARGS__) |
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|
|
#define DMERR(fmt, ...) pr_err(DM_FMT(fmt), ##__VA_ARGS__) |
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#define DMERR_LIMIT(fmt, ...) pr_err_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) |
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#define DMWARN(fmt, ...) pr_warn(DM_FMT(fmt), ##__VA_ARGS__) |
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#define DMWARN_LIMIT(fmt, ...) pr_warn_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) |
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#define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__) |
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#define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) |
|
|
|
#define DMDEBUG(fmt, ...) pr_debug(DM_FMT(fmt), ##__VA_ARGS__) |
|
#define DMDEBUG_LIMIT(fmt, ...) pr_debug_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) |
|
|
|
#define DMEMIT(x...) sz += ((sz >= maxlen) ? \ |
|
0 : scnprintf(result + sz, maxlen - sz, x)) |
|
|
|
/* |
|
* Definitions of return values from target end_io function. |
|
*/ |
|
#define DM_ENDIO_DONE 0 |
|
#define DM_ENDIO_INCOMPLETE 1 |
|
#define DM_ENDIO_REQUEUE 2 |
|
#define DM_ENDIO_DELAY_REQUEUE 3 |
|
|
|
/* |
|
* Definitions of return values from target map function. |
|
*/ |
|
#define DM_MAPIO_SUBMITTED 0 |
|
#define DM_MAPIO_REMAPPED 1 |
|
#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE |
|
#define DM_MAPIO_DELAY_REQUEUE DM_ENDIO_DELAY_REQUEUE |
|
#define DM_MAPIO_KILL 4 |
|
|
|
#define dm_sector_div64(x, y)( \ |
|
{ \ |
|
u64 _res; \ |
|
(x) = div64_u64_rem(x, y, &_res); \ |
|
_res; \ |
|
} \ |
|
) |
|
|
|
/* |
|
* 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)) |
|
|
|
/* |
|
* Sector offset taken relative to the start of the target instead of |
|
* relative to the start of the device. |
|
*/ |
|
#define dm_target_offset(ti, sector) ((sector) - (ti)->begin) |
|
|
|
static inline sector_t to_sector(unsigned long long n) |
|
{ |
|
return (n >> SECTOR_SHIFT); |
|
} |
|
|
|
static inline unsigned long to_bytes(sector_t n) |
|
{ |
|
return (n << SECTOR_SHIFT); |
|
} |
|
|
|
#endif /* _LINUX_DEVICE_MAPPER_H */
|
|
|