author | Florian Westphal <fw@strlen.de> |
Sun, 11 Jan 2009 20:20:11 +0100 | |
changeset 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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/* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) 2003 Sistina Software |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Device-Mapper dirty region log. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* This file is released under the LGPL. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef _LINUX_DM_DIRTY_LOG |
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Port of Linux 2.6.28 for use with network simulation cradle.
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#define _LINUX_DM_DIRTY_LOG |
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Port of Linux 2.6.28 for use with network simulation cradle.
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifdef __KERNEL__ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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Port of Linux 2.6.28 for use with network simulation cradle.
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#include <linux/types.h> |
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Port of Linux 2.6.28 for use with network simulation cradle.
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#include <linux/device-mapper.h> |
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typedef sector_t region_t; |
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struct dm_dirty_log_type; |
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struct dm_dirty_log { |
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struct dm_dirty_log_type *type; |
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void *context; |
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}; |
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struct dm_dirty_log_type { |
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const char *name; |
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struct module *module; |
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int (*ctr)(struct dm_dirty_log *log, struct dm_target *ti, |
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unsigned argc, char **argv); |
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void (*dtr)(struct dm_dirty_log *log); |
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|
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/* |
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* There are times when we don't want the log to touch |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* the disk. |
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*/ |
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int (*presuspend)(struct dm_dirty_log *log); |
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int (*postsuspend)(struct dm_dirty_log *log); |
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int (*resume)(struct dm_dirty_log *log); |
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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/* |
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* Retrieves the smallest size of region that the log can |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* deal with. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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uint32_t (*get_region_size)(struct dm_dirty_log *log); |
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|
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/* |
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* A predicate to say whether a region is clean or not. |
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* May block. |
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*/ |
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int (*is_clean)(struct dm_dirty_log *log, region_t region); |
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|
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/* |
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* Returns: 0, 1, -EWOULDBLOCK, < 0 |
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* A predicate function to check the area given by |
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* [sector, sector + len) is in sync. |
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* |
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* If -EWOULDBLOCK is returned the state of the region is |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* unknown, typically this will result in a read being |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* passed to a daemon to deal with, since a daemon is |
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* allowed to block. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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int (*in_sync)(struct dm_dirty_log *log, region_t region, |
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int can_block); |
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/* |
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* Flush the current log state (eg, to disk). This |
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* function may block. |
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*/ |
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int (*flush)(struct dm_dirty_log *log); |
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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/* |
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* Mark an area as clean or dirty. These functions may |
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* block, though for performance reasons blocking should |
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* be extremely rare (eg, allocating another chunk of |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* memory for some reason). |
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Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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void (*mark_region)(struct dm_dirty_log *log, region_t region); |
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void (*clear_region)(struct dm_dirty_log *log, region_t region); |
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|
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/* |
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* Returns: <0 (error), 0 (no region), 1 (region) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* The mirrord will need perform recovery on regions of |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* the mirror that are in the NOSYNC state. This |
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* function asks the log to tell the caller about the |
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* next region that this machine should recover. |
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* |
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* Do not confuse this function with 'in_sync()', one |
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* tells you if an area is synchronised, the other |
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* assigns recovery work. |
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*/ |
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int (*get_resync_work)(struct dm_dirty_log *log, region_t *region); |
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|
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/* |
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* This notifies the log that the resync status of a region |
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* has changed. It also clears the region from the recovering |
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* list (if present). |
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*/ |
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void (*set_region_sync)(struct dm_dirty_log *log, |
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region_t region, int in_sync); |
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|
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/* |
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* Returns the number of regions that are in sync. |
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*/ |
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region_t (*get_sync_count)(struct dm_dirty_log *log); |
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|
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/* |
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* Support function for mirror status requests. |
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*/ |
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int (*status)(struct dm_dirty_log *log, status_type_t status_type, |
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char *result, unsigned maxlen); |
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}; |
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int dm_dirty_log_type_register(struct dm_dirty_log_type *type); |
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int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type); |
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/* |
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* Make sure you use these two functions, rather than calling |
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* type->constructor/destructor() directly. |
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*/ |
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struct dm_dirty_log *dm_dirty_log_create(const char *type_name, |
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struct dm_target *ti, |
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unsigned argc, char **argv); |
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void dm_dirty_log_destroy(struct dm_dirty_log *log); |
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|
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#endif /* __KERNEL__ */ |
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#endif /* _LINUX_DM_DIRTY_LOG_H */ |