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Rev | Author | Line No. | Line |
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422 | giacomo | 1 | /* |
2 | * Copyright (C) 2001 Sistina Software (UK) Limited. |
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3 | * |
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4 | * This file is released under the LGPL. |
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5 | */ |
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6 | |||
7 | #ifndef _LINUX_DEVICE_MAPPER_H |
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8 | #define _LINUX_DEVICE_MAPPER_H |
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9 | |||
10 | struct dm_target; |
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11 | struct dm_table; |
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12 | struct dm_dev; |
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13 | |||
14 | typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t; |
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15 | |||
16 | /* |
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17 | * In the constructor the target parameter will already have the |
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18 | * table, type, begin and len fields filled in. |
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19 | */ |
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20 | typedef int (*dm_ctr_fn) (struct dm_target *target, |
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21 | unsigned int argc, char **argv); |
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22 | |||
23 | /* |
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24 | * The destructor doesn't need to free the dm_target, just |
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25 | * anything hidden ti->private. |
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26 | */ |
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27 | typedef void (*dm_dtr_fn) (struct dm_target *ti); |
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28 | |||
29 | /* |
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30 | * The map function must return: |
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31 | * < 0: error |
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32 | * = 0: The target will handle the io by resubmitting it later |
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33 | * > 0: simple remap complete |
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34 | */ |
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35 | typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); |
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36 | |||
37 | typedef void (*dm_suspend_fn) (struct dm_target *ti); |
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38 | typedef void (*dm_resume_fn) (struct dm_target *ti); |
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39 | |||
40 | typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type, |
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41 | char *result, unsigned int maxlen); |
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42 | |||
43 | void dm_error(const char *message); |
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44 | |||
45 | /* |
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46 | * Constructors should call these functions to ensure destination devices |
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47 | * are opened/closed correctly. |
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48 | * FIXME: too many arguments. |
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49 | */ |
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50 | int dm_get_device(struct dm_target *ti, const char *path, sector_t start, |
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51 | sector_t len, int mode, struct dm_dev **result); |
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52 | void dm_put_device(struct dm_target *ti, struct dm_dev *d); |
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53 | |||
54 | /* |
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55 | * Information about a target type |
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56 | */ |
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57 | struct target_type { |
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58 | const char *name; |
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59 | struct module *module; |
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60 | dm_ctr_fn ctr; |
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61 | dm_dtr_fn dtr; |
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62 | dm_map_fn map; |
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63 | dm_suspend_fn suspend; |
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64 | dm_resume_fn resume; |
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65 | dm_status_fn status; |
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66 | }; |
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67 | |||
68 | struct io_restrictions { |
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69 | unsigned short max_sectors; |
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70 | unsigned short max_phys_segments; |
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71 | unsigned short max_hw_segments; |
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72 | unsigned short hardsect_size; |
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73 | unsigned int max_segment_size; |
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74 | unsigned long seg_boundary_mask; |
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75 | }; |
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76 | |||
77 | struct dm_target { |
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78 | struct dm_table *table; |
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79 | struct target_type *type; |
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80 | |||
81 | /* target limits */ |
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82 | sector_t begin; |
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83 | sector_t len; |
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84 | |||
85 | /* FIXME: turn this into a mask, and merge with io_restrictions */ |
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86 | sector_t split_io; |
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87 | |||
88 | /* |
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89 | * These are automaticall filled in by |
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90 | * dm_table_get_device. |
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91 | */ |
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92 | struct io_restrictions limits; |
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93 | |||
94 | /* target specific data */ |
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95 | void *private; |
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96 | |||
97 | /* Used to provide an error string from the ctr */ |
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98 | char *error; |
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99 | }; |
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100 | |||
101 | int dm_register_target(struct target_type *t); |
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102 | int dm_unregister_target(struct target_type *t); |
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103 | |||
104 | #endif /* _LINUX_DEVICE_MAPPER_H */ |