Eric Lee / smarc-fsl-linux-kernel

Download as
Browse Code ยป

Commit a765e20eeb423d0fa6a02ffab51141e53bbd93cb

Authored by Alasdair G Kergon
1 parent 2d1e580afe
Exists in master and in 39 other branches 8mp-imx_5.4.70_2.3.0, 8qm-imx_5.4.70_2.3.0, emb_imx_lf-5.15.y, emb_lf-6.1.y, imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, imx_4.1.15_1.0.0_ga, pitx_8mp_lf-5.10.y, rt-smarc-imx_4.1.15_1.0.0_ga, rt_linux_5.15.71, smarc-8m-android-11.0.0_2.0.0, smarc-imx6_4.14.98_2.0.0_ga, smarc-imx6_4.9.88_2.0.0_ga, smarc-imx7_4.14.98_2.0.0_ga, smarc-imx7_4.9.11_1.0.0_ga, smarc-imx7_4.9.88_2.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-imx_4.1.15_1.0.0_ga, smarc-imx_4.9.11_1.0.0_ga, smarc-imx_4.9.51_imx8m_ga, smarc-imx_4.9.88_2.0.0_ga, smarc-m6.0.1_2.1.0-ga, smarc-n7.1.2_2.0.0-ga, smarc-rel_imx_4.1.15_1.2.0_ga, smarc_8m_00d0_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.14.78_1.0.0_ga, smarc_8m_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.19.35_1.1.0, smarc_8mm_imx_4.14.78_1.0.0_ga, smarc_8mm_imx_4.14.98_2.0.0_ga, smarc_8mm_imx_4.19.35_1.1.0, smarc_8mm_imx_5.4.24_2.1.0, smarc_8mp_lf-5.10.y, smarc_8mq_imx_5.4.24_2.1.0, smarc_8mq_lf-5.10.y, smarc_imx_lf-5.15.y

dm: move include files 

Publish the dm-io, dm-log and dm-kcopyd headers in include/linux.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>

Showing 13 changed files with 274 additions and 274 deletions Side-by-side Diff

... ... @@ -3,7 +3,7 @@
3 3 #
4 4  
5 5 dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \
6   - dm-ioctl.o dm-io.o kcopyd.o
  6 + dm-ioctl.o dm-io.o dm-kcopyd.o
7 7 dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o
8 8 dm-snapshot-objs := dm-snap.o dm-exception-store.o
9 9 dm-mirror-objs := dm-raid1.o
drivers/md/dm-exception-store.c
Diff comments   View file @ a765e20
... ... @@ -9,13 +9,13 @@
9 9  
10 10 #include "dm.h"
11 11 #include "dm-snap.h"
12   -#include "dm-io.h"
13   -#include "kcopyd.h"
14 12  
15 13 #include <linux/mm.h>
16 14 #include <linux/pagemap.h>
17 15 #include <linux/vmalloc.h>
18 16 #include <linux/slab.h>
  17 +#include <linux/dm-io.h>
  18 +#include <linux/dm-kcopyd.h>
19 19  
20 20 #define DM_MSG_PREFIX "snapshots"
21 21 #define DM_CHUNK_SIZE_DEFAULT_SECTORS 32 /* 16KB */
... ... @@ -5,7 +5,6 @@
5 5 * This file is released under the GPL.
6 6 */
7 7  
8   -#include "dm-io.h"
9 8 #include "dm.h"
10 9  
11 10 #include <linux/bio.h>
... ... @@ -13,6 +12,7 @@
13 12 #include <linux/module.h>
14 13 #include <linux/sched.h>
15 14 #include <linux/slab.h>
  15 +#include <linux/dm-io.h>
16 16  
17 17 struct dm_io_client {
18 18 mempool_t *pool;
drivers/md/dm-io.h
View file @ a765e20
1   -/*
2   - * Copyright (C) 2003 Sistina Software
3   - * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
4   - *
5   - * Device-Mapper low-level I/O.
6   - *
7   - * This file is released under the GPL.
8   - */
9   -
10   -#ifndef _LINUX_DM_IO_H
11   -#define _LINUX_DM_IO_H
12   -
13   -#ifdef __KERNEL__
14   -
15   -#include <linux/types.h>
16   -
17   -struct dm_io_region {
18   - struct block_device *bdev;
19   - sector_t sector;
20   - sector_t count; /* If this is zero the region is ignored. */
21   -};
22   -
23   -struct page_list {
24   - struct page_list *next;
25   - struct page *page;
26   -};
27   -
28   -typedef void (*io_notify_fn)(unsigned long error, void *context);
29   -
30   -enum dm_io_mem_type {
31   - DM_IO_PAGE_LIST,/* Page list */
32   - DM_IO_BVEC, /* Bio vector */
33   - DM_IO_VMA, /* Virtual memory area */
34   - DM_IO_KMEM, /* Kernel memory */
35   -};
36   -
37   -struct dm_io_memory {
38   - enum dm_io_mem_type type;
39   -
40   - union {
41   - struct page_list *pl;
42   - struct bio_vec *bvec;
43   - void *vma;
44   - void *addr;
45   - } ptr;
46   -
47   - unsigned offset;
48   -};
49   -
50   -struct dm_io_notify {
51   - io_notify_fn fn; /* Callback for asynchronous requests */
52   - void *context; /* Passed to callback */
53   -};
54   -
55   -/*
56   - * IO request structure
57   - */
58   -struct dm_io_client;
59   -struct dm_io_request {
60   - int bi_rw; /* READ|WRITE - not READA */
61   - struct dm_io_memory mem; /* Memory to use for io */
62   - struct dm_io_notify notify; /* Synchronous if notify.fn is NULL */
63   - struct dm_io_client *client; /* Client memory handler */
64   -};
65   -
66   -/*
67   - * For async io calls, users can alternatively use the dm_io() function below
68   - * and dm_io_client_create() to create private mempools for the client.
69   - *
70   - * Create/destroy may block.
71   - */
72   -struct dm_io_client *dm_io_client_create(unsigned num_pages);
73   -int dm_io_client_resize(unsigned num_pages, struct dm_io_client *client);
74   -void dm_io_client_destroy(struct dm_io_client *client);
75   -
76   -/*
77   - * IO interface using private per-client pools.
78   - * Each bit in the optional 'sync_error_bits' bitset indicates whether an
79   - * error occurred doing io to the corresponding region.
80   - */
81   -int dm_io(struct dm_io_request *io_req, unsigned num_regions,
82   - struct dm_io_region *region, unsigned long *sync_error_bits);
83   -
84   -#endif /* __KERNEL__ */
85   -#endif /* _LINUX_DM_IO_H */
drivers/md/dm-kcopyd.c
Diff comments   View file @ a765e20
... ... @@ -22,8 +22,8 @@
22 22 #include <linux/vmalloc.h>
23 23 #include <linux/workqueue.h>
24 24 #include <linux/mutex.h>
  25 +#include <linux/dm-kcopyd.h>
25 26  
26   -#include "kcopyd.h"
27 27 #include "dm.h"
28 28  
29 29 /*-----------------------------------------------------------------
drivers/md/dm-kcopyd.h
View file @ a765e20
1   -/*
2   - * Copyright (C) 2001 - 2003 Sistina Software
3   - * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
4   - *
5   - * kcopyd provides a simple interface for copying an area of one
6   - * block-device to one or more other block-devices, either synchronous
7   - * or with an asynchronous completion notification.
8   - *
9   - * This file is released under the GPL.
10   - */
11   -
12   -#ifndef _LINUX_DM_KCOPYD_H
13   -#define _LINUX_DM_KCOPYD_H
14   -
15   -#ifdef __KERNEL__
16   -
17   -#include "dm-io.h"
18   -
19   -/* FIXME: make this configurable */
20   -#define DM_KCOPYD_MAX_REGIONS 8
21   -
22   -#define DM_KCOPYD_IGNORE_ERROR 1
23   -
24   -/*
25   - * To use kcopyd you must first create a dm_kcopyd_client object.
26   - */
27   -struct dm_kcopyd_client;
28   -int dm_kcopyd_client_create(unsigned num_pages,
29   - struct dm_kcopyd_client **result);
30   -void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);
31   -
32   -/*
33   - * Submit a copy job to kcopyd. This is built on top of the
34   - * previous three fns.
35   - *
36   - * read_err is a boolean,
37   - * write_err is a bitset, with 1 bit for each destination region
38   - */
39   -typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
40   - void *context);
41   -
42   -int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
43   - unsigned num_dests, struct dm_io_region *dests,
44   - unsigned flags, dm_kcopyd_notify_fn fn, void *context);
45   -
46   -#endif /* __KERNEL__ */
47   -#endif /* _LINUX_DM_KCOPYD_H */
... ... @@ -9,9 +9,9 @@
9 9 #include <linux/slab.h>
10 10 #include <linux/module.h>
11 11 #include <linux/vmalloc.h>
  12 +#include <linux/dm-io.h>
  13 +#include <linux/dm-dirty-log.h>
12 14  
13   -#include "dm-log.h"
14   -#include "dm-io.h"
15 15 #include "dm.h"
16 16  
17 17 #define DM_MSG_PREFIX "dirty region log"
drivers/md/dm-log.h
View file @ a765e20
1   -/*
2   - * Copyright (C) 2003 Sistina Software
3   - * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4   - *
5   - * Device-Mapper dirty region log.
6   - *
7   - * This file is released under the LGPL.
8   - */
9   -
10   -#ifndef _LINUX_DM_DIRTY_LOG
11   -#define _LINUX_DM_DIRTY_LOG
12   -
13   -#ifdef __KERNEL__
14   -
15   -#include <linux/types.h>
16   -#include <linux/device-mapper.h>
17   -
18   -typedef sector_t region_t;
19   -
20   -struct dm_dirty_log_type;
21   -
22   -struct dm_dirty_log {
23   - struct dm_dirty_log_type *type;
24   - void *context;
25   -};
26   -
27   -struct dm_dirty_log_type {
28   - const char *name;
29   - struct module *module;
30   -
31   - int (*ctr)(struct dm_dirty_log *log, struct dm_target *ti,
32   - unsigned argc, char **argv);
33   - void (*dtr)(struct dm_dirty_log *log);
34   -
35   - /*
36   - * There are times when we don't want the log to touch
37   - * the disk.
38   - */
39   - int (*presuspend)(struct dm_dirty_log *log);
40   - int (*postsuspend)(struct dm_dirty_log *log);
41   - int (*resume)(struct dm_dirty_log *log);
42   -
43   - /*
44   - * Retrieves the smallest size of region that the log can
45   - * deal with.
46   - */
47   - uint32_t (*get_region_size)(struct dm_dirty_log *log);
48   -
49   - /*
50   - * A predicate to say whether a region is clean or not.
51   - * May block.
52   - */
53   - int (*is_clean)(struct dm_dirty_log *log, region_t region);
54   -
55   - /*
56   - * Returns: 0, 1, -EWOULDBLOCK, < 0
57   - *
58   - * A predicate function to check the area given by
59   - * [sector, sector + len) is in sync.
60   - *
61   - * If -EWOULDBLOCK is returned the state of the region is
62   - * unknown, typically this will result in a read being
63   - * passed to a daemon to deal with, since a daemon is
64   - * allowed to block.
65   - */
66   - int (*in_sync)(struct dm_dirty_log *log, region_t region,
67   - int can_block);
68   -
69   - /*
70   - * Flush the current log state (eg, to disk). This
71   - * function may block.
72   - */
73   - int (*flush)(struct dm_dirty_log *log);
74   -
75   - /*
76   - * Mark an area as clean or dirty. These functions may
77   - * block, though for performance reasons blocking should
78   - * be extremely rare (eg, allocating another chunk of
79   - * memory for some reason).
80   - */
81   - void (*mark_region)(struct dm_dirty_log *log, region_t region);
82   - void (*clear_region)(struct dm_dirty_log *log, region_t region);
83   -
84   - /*
85   - * Returns: <0 (error), 0 (no region), 1 (region)
86   - *
87   - * The mirrord will need perform recovery on regions of
88   - * the mirror that are in the NOSYNC state. This
89   - * function asks the log to tell the caller about the
90   - * next region that this machine should recover.
91   - *
92   - * Do not confuse this function with 'in_sync()', one
93   - * tells you if an area is synchronised, the other
94   - * assigns recovery work.
95   - */
96   - int (*get_resync_work)(struct dm_dirty_log *log, region_t *region);
97   -
98   - /*
99   - * This notifies the log that the resync status of a region
100   - * has changed. It also clears the region from the recovering
101   - * list (if present).
102   - */
103   - void (*set_region_sync)(struct dm_dirty_log *log,
104   - region_t region, int in_sync);
105   -
106   - /*
107   - * Returns the number of regions that are in sync.
108   - */
109   - region_t (*get_sync_count)(struct dm_dirty_log *log);
110   -
111   - /*
112   - * Support function for mirror status requests.
113   - */
114   - int (*status)(struct dm_dirty_log *log, status_type_t status_type,
115   - char *result, unsigned maxlen);
116   -};
117   -
118   -int dm_dirty_log_type_register(struct dm_dirty_log_type *type);
119   -int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type);
120   -
121   -/*
122   - * Make sure you use these two functions, rather than calling
123   - * type->constructor/destructor() directly.
124   - */
125   -struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
126   - struct dm_target *ti,
127   - unsigned argc, char **argv);
128   -void dm_dirty_log_destroy(struct dm_dirty_log *log);
129   -
130   -#endif /* __KERNEL__ */
131   -#endif /* _LINUX_DM_DIRTY_LOG_H */
drivers/md/dm-raid1.c
Diff comments   View file @ a765e20
... ... @@ -7,9 +7,6 @@
7 7 #include "dm.h"
8 8 #include "dm-bio-list.h"
9 9 #include "dm-bio-record.h"
10   -#include "dm-io.h"
11   -#include "dm-log.h"
12   -#include "kcopyd.h"
13 10  
14 11 #include <linux/ctype.h>
15 12 #include <linux/init.h>
... ... @@ -22,6 +19,9 @@
22 19 #include <linux/workqueue.h>
23 20 #include <linux/log2.h>
24 21 #include <linux/hardirq.h>
  22 +#include <linux/dm-io.h>
  23 +#include <linux/dm-dirty-log.h>
  24 +#include <linux/dm-kcopyd.h>
25 25  
26 26 #define DM_MSG_PREFIX "raid1"
27 27 #define DM_IO_PAGES 64
drivers/md/dm-snap.c
Diff comments   View file @ a765e20
... ... @@ -18,10 +18,10 @@
18 18 #include <linux/slab.h>
19 19 #include <linux/vmalloc.h>
20 20 #include <linux/log2.h>
  21 +#include <linux/dm-kcopyd.h>
21 22  
22 23 #include "dm-snap.h"
23 24 #include "dm-bio-list.h"
24   -#include "kcopyd.h"
25 25  
26 26 #define DM_MSG_PREFIX "snapshots"
27 27  
include/linux/dm-dirty-log.h
Diff comments   View file @ a765e20
  1 +/*
  2 + * Copyright (C) 2003 Sistina Software
  3 + * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
  4 + *
  5 + * Device-Mapper dirty region log.
  6 + *
  7 + * This file is released under the LGPL.
  8 + */
  9 +
  10 +#ifndef _LINUX_DM_DIRTY_LOG
  11 +#define _LINUX_DM_DIRTY_LOG
  12 +
  13 +#ifdef __KERNEL__
  14 +
  15 +#include <linux/types.h>
  16 +#include <linux/device-mapper.h>
  17 +
  18 +typedef sector_t region_t;
  19 +
  20 +struct dm_dirty_log_type;
  21 +
  22 +struct dm_dirty_log {
  23 + struct dm_dirty_log_type *type;
  24 + void *context;
  25 +};
  26 +
  27 +struct dm_dirty_log_type {
  28 + const char *name;
  29 + struct module *module;
  30 +
  31 + int (*ctr)(struct dm_dirty_log *log, struct dm_target *ti,
  32 + unsigned argc, char **argv);
  33 + void (*dtr)(struct dm_dirty_log *log);
  34 +
  35 + /*
  36 + * There are times when we don't want the log to touch
  37 + * the disk.
  38 + */
  39 + int (*presuspend)(struct dm_dirty_log *log);
  40 + int (*postsuspend)(struct dm_dirty_log *log);
  41 + int (*resume)(struct dm_dirty_log *log);
  42 +
  43 + /*
  44 + * Retrieves the smallest size of region that the log can
  45 + * deal with.
  46 + */
  47 + uint32_t (*get_region_size)(struct dm_dirty_log *log);
  48 +
  49 + /*
  50 + * A predicate to say whether a region is clean or not.
  51 + * May block.
  52 + */
  53 + int (*is_clean)(struct dm_dirty_log *log, region_t region);
  54 +
  55 + /*
  56 + * Returns: 0, 1, -EWOULDBLOCK, < 0
  57 + *
  58 + * A predicate function to check the area given by
  59 + * [sector, sector + len) is in sync.
  60 + *
  61 + * If -EWOULDBLOCK is returned the state of the region is
  62 + * unknown, typically this will result in a read being
  63 + * passed to a daemon to deal with, since a daemon is
  64 + * allowed to block.
  65 + */
  66 + int (*in_sync)(struct dm_dirty_log *log, region_t region,
  67 + int can_block);
  68 +
  69 + /*
  70 + * Flush the current log state (eg, to disk). This
  71 + * function may block.
  72 + */
  73 + int (*flush)(struct dm_dirty_log *log);
  74 +
  75 + /*
  76 + * Mark an area as clean or dirty. These functions may
  77 + * block, though for performance reasons blocking should
  78 + * be extremely rare (eg, allocating another chunk of
  79 + * memory for some reason).
  80 + */
  81 + void (*mark_region)(struct dm_dirty_log *log, region_t region);
  82 + void (*clear_region)(struct dm_dirty_log *log, region_t region);
  83 +
  84 + /*
  85 + * Returns: <0 (error), 0 (no region), 1 (region)
  86 + *
  87 + * The mirrord will need perform recovery on regions of
  88 + * the mirror that are in the NOSYNC state. This
  89 + * function asks the log to tell the caller about the
  90 + * next region that this machine should recover.
  91 + *
  92 + * Do not confuse this function with 'in_sync()', one
  93 + * tells you if an area is synchronised, the other
  94 + * assigns recovery work.
  95 + */
  96 + int (*get_resync_work)(struct dm_dirty_log *log, region_t *region);
  97 +
  98 + /*
  99 + * This notifies the log that the resync status of a region
  100 + * has changed. It also clears the region from the recovering
  101 + * list (if present).
  102 + */
  103 + void (*set_region_sync)(struct dm_dirty_log *log,
  104 + region_t region, int in_sync);
  105 +
  106 + /*
  107 + * Returns the number of regions that are in sync.
  108 + */
  109 + region_t (*get_sync_count)(struct dm_dirty_log *log);
  110 +
  111 + /*
  112 + * Support function for mirror status requests.
  113 + */
  114 + int (*status)(struct dm_dirty_log *log, status_type_t status_type,
  115 + char *result, unsigned maxlen);
  116 +};
  117 +
  118 +int dm_dirty_log_type_register(struct dm_dirty_log_type *type);
  119 +int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type);
  120 +
  121 +/*
  122 + * Make sure you use these two functions, rather than calling
  123 + * type->constructor/destructor() directly.
  124 + */
  125 +struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
  126 + struct dm_target *ti,
  127 + unsigned argc, char **argv);
  128 +void dm_dirty_log_destroy(struct dm_dirty_log *log);
  129 +
  130 +#endif /* __KERNEL__ */
  131 +#endif /* _LINUX_DM_DIRTY_LOG_H */
include/linux/dm-io.h
Diff comments   View file @ a765e20
  1 +/*
  2 + * Copyright (C) 2003 Sistina Software
  3 + * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
  4 + *
  5 + * Device-Mapper low-level I/O.
  6 + *
  7 + * This file is released under the GPL.
  8 + */
  9 +
  10 +#ifndef _LINUX_DM_IO_H
  11 +#define _LINUX_DM_IO_H
  12 +
  13 +#ifdef __KERNEL__
  14 +
  15 +#include <linux/types.h>
  16 +
  17 +struct dm_io_region {
  18 + struct block_device *bdev;
  19 + sector_t sector;
  20 + sector_t count; /* If this is zero the region is ignored. */
  21 +};
  22 +
  23 +struct page_list {
  24 + struct page_list *next;
  25 + struct page *page;
  26 +};
  27 +
  28 +typedef void (*io_notify_fn)(unsigned long error, void *context);
  29 +
  30 +enum dm_io_mem_type {
  31 + DM_IO_PAGE_LIST,/* Page list */
  32 + DM_IO_BVEC, /* Bio vector */
  33 + DM_IO_VMA, /* Virtual memory area */
  34 + DM_IO_KMEM, /* Kernel memory */
  35 +};
  36 +
  37 +struct dm_io_memory {
  38 + enum dm_io_mem_type type;
  39 +
  40 + union {
  41 + struct page_list *pl;
  42 + struct bio_vec *bvec;
  43 + void *vma;
  44 + void *addr;
  45 + } ptr;
  46 +
  47 + unsigned offset;
  48 +};
  49 +
  50 +struct dm_io_notify {
  51 + io_notify_fn fn; /* Callback for asynchronous requests */
  52 + void *context; /* Passed to callback */
  53 +};
  54 +
  55 +/*
  56 + * IO request structure
  57 + */
  58 +struct dm_io_client;
  59 +struct dm_io_request {
  60 + int bi_rw; /* READ|WRITE - not READA */
  61 + struct dm_io_memory mem; /* Memory to use for io */
  62 + struct dm_io_notify notify; /* Synchronous if notify.fn is NULL */
  63 + struct dm_io_client *client; /* Client memory handler */
  64 +};
  65 +
  66 +/*
  67 + * For async io calls, users can alternatively use the dm_io() function below
  68 + * and dm_io_client_create() to create private mempools for the client.
  69 + *
  70 + * Create/destroy may block.
  71 + */
  72 +struct dm_io_client *dm_io_client_create(unsigned num_pages);
  73 +int dm_io_client_resize(unsigned num_pages, struct dm_io_client *client);
  74 +void dm_io_client_destroy(struct dm_io_client *client);
  75 +
  76 +/*
  77 + * IO interface using private per-client pools.
  78 + * Each bit in the optional 'sync_error_bits' bitset indicates whether an
  79 + * error occurred doing io to the corresponding region.
  80 + */
  81 +int dm_io(struct dm_io_request *io_req, unsigned num_regions,
  82 + struct dm_io_region *region, unsigned long *sync_error_bits);
  83 +
  84 +#endif /* __KERNEL__ */
  85 +#endif /* _LINUX_DM_IO_H */
include/linux/dm-kcopyd.h
Diff comments   View file @ a765e20
  1 +/*
  2 + * Copyright (C) 2001 - 2003 Sistina Software
  3 + * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
  4 + *
  5 + * kcopyd provides a simple interface for copying an area of one
  6 + * block-device to one or more other block-devices, either synchronous
  7 + * or with an asynchronous completion notification.
  8 + *
  9 + * This file is released under the GPL.
  10 + */
  11 +
  12 +#ifndef _LINUX_DM_KCOPYD_H
  13 +#define _LINUX_DM_KCOPYD_H
  14 +
  15 +#ifdef __KERNEL__
  16 +
  17 +#include <linux/dm-io.h>
  18 +
  19 +/* FIXME: make this configurable */
  20 +#define DM_KCOPYD_MAX_REGIONS 8
  21 +
  22 +#define DM_KCOPYD_IGNORE_ERROR 1
  23 +
  24 +/*
  25 + * To use kcopyd you must first create a dm_kcopyd_client object.
  26 + */
  27 +struct dm_kcopyd_client;
  28 +int dm_kcopyd_client_create(unsigned num_pages,
  29 + struct dm_kcopyd_client **result);
  30 +void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);
  31 +
  32 +/*
  33 + * Submit a copy job to kcopyd. This is built on top of the
  34 + * previous three fns.
  35 + *
  36 + * read_err is a boolean,
  37 + * write_err is a bitset, with 1 bit for each destination region
  38 + */
  39 +typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
  40 + void *context);
  41 +
  42 +int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
  43 + unsigned num_dests, struct dm_io_region *dests,
  44 + unsigned flags, dm_kcopyd_notify_fn fn, void *context);
  45 +
  46 +#endif /* __KERNEL__ */
  47 +#endif /* _LINUX_DM_KCOPYD_H */