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900 lines
20 KiB
900 lines
20 KiB
/* |
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* Copyright (C) 2003 Sistina Software |
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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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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/vmalloc.h> |
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#include <linux/dm-io.h> |
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#include <linux/dm-dirty-log.h> |
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#include <linux/device-mapper.h> |
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#define DM_MSG_PREFIX "dirty region log" |
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static LIST_HEAD(_log_types); |
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static DEFINE_SPINLOCK(_lock); |
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static struct dm_dirty_log_type *__find_dirty_log_type(const char *name) |
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{ |
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struct dm_dirty_log_type *log_type; |
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list_for_each_entry(log_type, &_log_types, list) |
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if (!strcmp(name, log_type->name)) |
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return log_type; |
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return NULL; |
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} |
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static struct dm_dirty_log_type *_get_dirty_log_type(const char *name) |
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{ |
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struct dm_dirty_log_type *log_type; |
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spin_lock(&_lock); |
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log_type = __find_dirty_log_type(name); |
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if (log_type && !try_module_get(log_type->module)) |
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log_type = NULL; |
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spin_unlock(&_lock); |
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return log_type; |
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} |
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/* |
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* get_type |
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* @type_name |
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* |
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* Attempt to retrieve the dm_dirty_log_type by name. If not already |
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* available, attempt to load the appropriate module. |
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* |
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* Log modules are named "dm-log-" followed by the 'type_name'. |
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* Modules may contain multiple types. |
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* This function will first try the module "dm-log-<type_name>", |
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* then truncate 'type_name' on the last '-' and try again. |
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* |
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* For example, if type_name was "clustered-disk", it would search |
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* 'dm-log-clustered-disk' then 'dm-log-clustered'. |
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* |
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* Returns: dirty_log_type* on success, NULL on failure |
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*/ |
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static struct dm_dirty_log_type *get_type(const char *type_name) |
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{ |
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char *p, *type_name_dup; |
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struct dm_dirty_log_type *log_type; |
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if (!type_name) |
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return NULL; |
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log_type = _get_dirty_log_type(type_name); |
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if (log_type) |
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return log_type; |
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type_name_dup = kstrdup(type_name, GFP_KERNEL); |
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if (!type_name_dup) { |
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DMWARN("No memory left to attempt log module load for \"%s\"", |
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type_name); |
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return NULL; |
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} |
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while (request_module("dm-log-%s", type_name_dup) || |
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!(log_type = _get_dirty_log_type(type_name))) { |
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p = strrchr(type_name_dup, '-'); |
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if (!p) |
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break; |
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p[0] = '\0'; |
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} |
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if (!log_type) |
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DMWARN("Module for logging type \"%s\" not found.", type_name); |
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kfree(type_name_dup); |
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return log_type; |
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} |
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static void put_type(struct dm_dirty_log_type *type) |
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{ |
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if (!type) |
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return; |
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spin_lock(&_lock); |
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if (!__find_dirty_log_type(type->name)) |
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goto out; |
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module_put(type->module); |
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out: |
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spin_unlock(&_lock); |
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} |
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int dm_dirty_log_type_register(struct dm_dirty_log_type *type) |
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{ |
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int r = 0; |
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spin_lock(&_lock); |
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if (!__find_dirty_log_type(type->name)) |
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list_add(&type->list, &_log_types); |
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else |
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r = -EEXIST; |
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spin_unlock(&_lock); |
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return r; |
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} |
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EXPORT_SYMBOL(dm_dirty_log_type_register); |
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int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type) |
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{ |
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spin_lock(&_lock); |
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if (!__find_dirty_log_type(type->name)) { |
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spin_unlock(&_lock); |
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return -EINVAL; |
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} |
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list_del(&type->list); |
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spin_unlock(&_lock); |
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return 0; |
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} |
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EXPORT_SYMBOL(dm_dirty_log_type_unregister); |
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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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int (*flush_callback_fn)(struct dm_target *ti), |
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unsigned int argc, char **argv) |
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{ |
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struct dm_dirty_log_type *type; |
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struct dm_dirty_log *log; |
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log = kmalloc(sizeof(*log), GFP_KERNEL); |
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if (!log) |
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return NULL; |
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type = get_type(type_name); |
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if (!type) { |
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kfree(log); |
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return NULL; |
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} |
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log->flush_callback_fn = flush_callback_fn; |
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log->type = type; |
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if (type->ctr(log, ti, argc, argv)) { |
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kfree(log); |
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put_type(type); |
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return NULL; |
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} |
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return log; |
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} |
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EXPORT_SYMBOL(dm_dirty_log_create); |
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void dm_dirty_log_destroy(struct dm_dirty_log *log) |
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{ |
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log->type->dtr(log); |
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put_type(log->type); |
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kfree(log); |
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} |
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EXPORT_SYMBOL(dm_dirty_log_destroy); |
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/*----------------------------------------------------------------- |
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* Persistent and core logs share a lot of their implementation. |
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* FIXME: need a reload method to be called from a resume |
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*---------------------------------------------------------------*/ |
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/* |
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* Magic for persistent mirrors: "MiRr" |
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*/ |
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#define MIRROR_MAGIC 0x4D695272 |
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/* |
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* The on-disk version of the metadata. |
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*/ |
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#define MIRROR_DISK_VERSION 2 |
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#define LOG_OFFSET 2 |
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struct log_header_disk { |
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__le32 magic; |
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/* |
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* Simple, incrementing version. no backward |
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* compatibility. |
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*/ |
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__le32 version; |
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__le64 nr_regions; |
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} __packed; |
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struct log_header_core { |
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uint32_t magic; |
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uint32_t version; |
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uint64_t nr_regions; |
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}; |
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struct log_c { |
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struct dm_target *ti; |
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int touched_dirtied; |
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int touched_cleaned; |
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int flush_failed; |
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uint32_t region_size; |
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unsigned int region_count; |
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region_t sync_count; |
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unsigned bitset_uint32_count; |
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uint32_t *clean_bits; |
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uint32_t *sync_bits; |
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uint32_t *recovering_bits; /* FIXME: this seems excessive */ |
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int sync_search; |
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/* Resync flag */ |
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enum sync { |
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DEFAULTSYNC, /* Synchronize if necessary */ |
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NOSYNC, /* Devices known to be already in sync */ |
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FORCESYNC, /* Force a sync to happen */ |
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} sync; |
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struct dm_io_request io_req; |
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/* |
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* Disk log fields |
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*/ |
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int log_dev_failed; |
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int log_dev_flush_failed; |
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struct dm_dev *log_dev; |
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struct log_header_core header; |
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struct dm_io_region header_location; |
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struct log_header_disk *disk_header; |
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}; |
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/* |
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* The touched member needs to be updated every time we access |
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* one of the bitsets. |
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*/ |
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static inline int log_test_bit(uint32_t *bs, unsigned bit) |
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{ |
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return test_bit_le(bit, bs) ? 1 : 0; |
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} |
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static inline void log_set_bit(struct log_c *l, |
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uint32_t *bs, unsigned bit) |
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{ |
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__set_bit_le(bit, bs); |
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l->touched_cleaned = 1; |
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} |
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static inline void log_clear_bit(struct log_c *l, |
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uint32_t *bs, unsigned bit) |
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{ |
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__clear_bit_le(bit, bs); |
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l->touched_dirtied = 1; |
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} |
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/*---------------------------------------------------------------- |
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* Header IO |
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*--------------------------------------------------------------*/ |
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static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk) |
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{ |
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disk->magic = cpu_to_le32(core->magic); |
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disk->version = cpu_to_le32(core->version); |
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disk->nr_regions = cpu_to_le64(core->nr_regions); |
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} |
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static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk) |
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{ |
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core->magic = le32_to_cpu(disk->magic); |
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core->version = le32_to_cpu(disk->version); |
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core->nr_regions = le64_to_cpu(disk->nr_regions); |
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} |
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static int rw_header(struct log_c *lc, int op) |
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{ |
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lc->io_req.bi_op = op; |
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lc->io_req.bi_op_flags = 0; |
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return dm_io(&lc->io_req, 1, &lc->header_location, NULL); |
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} |
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static int flush_header(struct log_c *lc) |
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{ |
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struct dm_io_region null_location = { |
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.bdev = lc->header_location.bdev, |
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.sector = 0, |
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.count = 0, |
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}; |
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lc->io_req.bi_op = REQ_OP_WRITE; |
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lc->io_req.bi_op_flags = REQ_PREFLUSH; |
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return dm_io(&lc->io_req, 1, &null_location, NULL); |
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} |
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static int read_header(struct log_c *log) |
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{ |
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int r; |
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r = rw_header(log, REQ_OP_READ); |
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if (r) |
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return r; |
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header_from_disk(&log->header, log->disk_header); |
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/* New log required? */ |
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if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { |
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log->header.magic = MIRROR_MAGIC; |
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log->header.version = MIRROR_DISK_VERSION; |
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log->header.nr_regions = 0; |
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} |
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#ifdef __LITTLE_ENDIAN |
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if (log->header.version == 1) |
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log->header.version = 2; |
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#endif |
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if (log->header.version != MIRROR_DISK_VERSION) { |
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DMWARN("incompatible disk log version"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int _check_region_size(struct dm_target *ti, uint32_t region_size) |
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{ |
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if (region_size < 2 || region_size > ti->len) |
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return 0; |
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if (!is_power_of_2(region_size)) |
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return 0; |
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return 1; |
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} |
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/*---------------------------------------------------------------- |
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* core log constructor/destructor |
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* |
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* argv contains region_size followed optionally by [no]sync |
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*--------------------------------------------------------------*/ |
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#define BYTE_SHIFT 3 |
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static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, |
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unsigned int argc, char **argv, |
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struct dm_dev *dev) |
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{ |
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enum sync sync = DEFAULTSYNC; |
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struct log_c *lc; |
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uint32_t region_size; |
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unsigned int region_count; |
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size_t bitset_size, buf_size; |
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int r; |
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char dummy; |
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if (argc < 1 || argc > 2) { |
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DMWARN("wrong number of arguments to dirty region log"); |
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return -EINVAL; |
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} |
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if (argc > 1) { |
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if (!strcmp(argv[1], "sync")) |
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sync = FORCESYNC; |
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else if (!strcmp(argv[1], "nosync")) |
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sync = NOSYNC; |
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else { |
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DMWARN("unrecognised sync argument to " |
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"dirty region log: %s", argv[1]); |
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return -EINVAL; |
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} |
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} |
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if (sscanf(argv[0], "%u%c", ®ion_size, &dummy) != 1 || |
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!_check_region_size(ti, region_size)) { |
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DMWARN("invalid region size %s", argv[0]); |
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return -EINVAL; |
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} |
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region_count = dm_sector_div_up(ti->len, region_size); |
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lc = kmalloc(sizeof(*lc), GFP_KERNEL); |
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if (!lc) { |
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DMWARN("couldn't allocate core log"); |
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return -ENOMEM; |
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} |
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lc->ti = ti; |
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lc->touched_dirtied = 0; |
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lc->touched_cleaned = 0; |
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lc->flush_failed = 0; |
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lc->region_size = region_size; |
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lc->region_count = region_count; |
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lc->sync = sync; |
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/* |
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* Work out how many "unsigned long"s we need to hold the bitset. |
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*/ |
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bitset_size = dm_round_up(region_count, |
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sizeof(*lc->clean_bits) << BYTE_SHIFT); |
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bitset_size >>= BYTE_SHIFT; |
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lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
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/* |
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* Disk log? |
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*/ |
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if (!dev) { |
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lc->clean_bits = vmalloc(bitset_size); |
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if (!lc->clean_bits) { |
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DMWARN("couldn't allocate clean bitset"); |
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kfree(lc); |
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return -ENOMEM; |
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} |
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lc->disk_header = NULL; |
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} else { |
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lc->log_dev = dev; |
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lc->log_dev_failed = 0; |
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lc->log_dev_flush_failed = 0; |
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lc->header_location.bdev = lc->log_dev->bdev; |
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lc->header_location.sector = 0; |
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/* |
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* Buffer holds both header and bitset. |
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*/ |
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buf_size = |
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dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, |
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bdev_logical_block_size(lc->header_location. |
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bdev)); |
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if (buf_size > bdev_nr_bytes(dev->bdev)) { |
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DMWARN("log device %s too small: need %llu bytes", |
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dev->name, (unsigned long long)buf_size); |
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kfree(lc); |
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return -EINVAL; |
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} |
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lc->header_location.count = buf_size >> SECTOR_SHIFT; |
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lc->io_req.mem.type = DM_IO_VMA; |
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lc->io_req.notify.fn = NULL; |
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lc->io_req.client = dm_io_client_create(); |
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if (IS_ERR(lc->io_req.client)) { |
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r = PTR_ERR(lc->io_req.client); |
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DMWARN("couldn't allocate disk io client"); |
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kfree(lc); |
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return r; |
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} |
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lc->disk_header = vmalloc(buf_size); |
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if (!lc->disk_header) { |
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DMWARN("couldn't allocate disk log buffer"); |
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dm_io_client_destroy(lc->io_req.client); |
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kfree(lc); |
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return -ENOMEM; |
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} |
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lc->io_req.mem.ptr.vma = lc->disk_header; |
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lc->clean_bits = (void *)lc->disk_header + |
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(LOG_OFFSET << SECTOR_SHIFT); |
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} |
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memset(lc->clean_bits, -1, bitset_size); |
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lc->sync_bits = vmalloc(bitset_size); |
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if (!lc->sync_bits) { |
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DMWARN("couldn't allocate sync bitset"); |
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if (!dev) |
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vfree(lc->clean_bits); |
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else |
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dm_io_client_destroy(lc->io_req.client); |
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vfree(lc->disk_header); |
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kfree(lc); |
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return -ENOMEM; |
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} |
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memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); |
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lc->sync_count = (sync == NOSYNC) ? region_count : 0; |
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lc->recovering_bits = vzalloc(bitset_size); |
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if (!lc->recovering_bits) { |
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DMWARN("couldn't allocate sync bitset"); |
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vfree(lc->sync_bits); |
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if (!dev) |
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vfree(lc->clean_bits); |
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else |
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dm_io_client_destroy(lc->io_req.client); |
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vfree(lc->disk_header); |
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kfree(lc); |
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return -ENOMEM; |
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} |
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lc->sync_search = 0; |
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log->context = lc; |
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return 0; |
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} |
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static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
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unsigned int argc, char **argv) |
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{ |
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return create_log_context(log, ti, argc, argv, NULL); |
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} |
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static void destroy_log_context(struct log_c *lc) |
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{ |
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vfree(lc->sync_bits); |
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vfree(lc->recovering_bits); |
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kfree(lc); |
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} |
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static void core_dtr(struct dm_dirty_log *log) |
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{ |
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struct log_c *lc = (struct log_c *) log->context; |
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vfree(lc->clean_bits); |
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destroy_log_context(lc); |
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} |
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/*---------------------------------------------------------------- |
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* disk log constructor/destructor |
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* |
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* argv contains log_device region_size followed optionally by [no]sync |
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*--------------------------------------------------------------*/ |
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static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
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unsigned int argc, char **argv) |
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{ |
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int r; |
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struct dm_dev *dev; |
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if (argc < 2 || argc > 3) { |
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DMWARN("wrong number of arguments to disk dirty region log"); |
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return -EINVAL; |
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} |
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r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); |
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if (r) |
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return r; |
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r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
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if (r) { |
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dm_put_device(ti, dev); |
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return r; |
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} |
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return 0; |
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} |
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static void disk_dtr(struct dm_dirty_log *log) |
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{ |
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struct log_c *lc = (struct log_c *) log->context; |
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dm_put_device(lc->ti, lc->log_dev); |
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vfree(lc->disk_header); |
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dm_io_client_destroy(lc->io_req.client); |
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destroy_log_context(lc); |
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} |
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|
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static void fail_log_device(struct log_c *lc) |
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{ |
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if (lc->log_dev_failed) |
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return; |
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lc->log_dev_failed = 1; |
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dm_table_event(lc->ti->table); |
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} |
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static int disk_resume(struct dm_dirty_log *log) |
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{ |
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int r; |
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unsigned i; |
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struct log_c *lc = (struct log_c *) log->context; |
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size_t size = lc->bitset_uint32_count * sizeof(uint32_t); |
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|
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/* read the disk header */ |
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r = read_header(lc); |
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if (r) { |
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DMWARN("%s: Failed to read header on dirty region log device", |
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lc->log_dev->name); |
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fail_log_device(lc); |
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/* |
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* If the log device cannot be read, we must assume |
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* all regions are out-of-sync. If we simply return |
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* here, the state will be uninitialized and could |
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* lead us to return 'in-sync' status for regions |
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* that are actually 'out-of-sync'. |
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*/ |
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lc->header.nr_regions = 0; |
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} |
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|
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/* set or clear any new bits -- device has grown */ |
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if (lc->sync == NOSYNC) |
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for (i = lc->header.nr_regions; i < lc->region_count; i++) |
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/* FIXME: amazingly inefficient */ |
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log_set_bit(lc, lc->clean_bits, i); |
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else |
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for (i = lc->header.nr_regions; i < lc->region_count; i++) |
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/* FIXME: amazingly inefficient */ |
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log_clear_bit(lc, lc->clean_bits, i); |
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|
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/* clear any old bits -- device has shrunk */ |
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for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) |
|
log_clear_bit(lc, lc->clean_bits, i); |
|
|
|
/* copy clean across to sync */ |
|
memcpy(lc->sync_bits, lc->clean_bits, size); |
|
lc->sync_count = memweight(lc->clean_bits, |
|
lc->bitset_uint32_count * sizeof(uint32_t)); |
|
lc->sync_search = 0; |
|
|
|
/* set the correct number of regions in the header */ |
|
lc->header.nr_regions = lc->region_count; |
|
|
|
header_to_disk(&lc->header, lc->disk_header); |
|
|
|
/* write the new header */ |
|
r = rw_header(lc, REQ_OP_WRITE); |
|
if (!r) { |
|
r = flush_header(lc); |
|
if (r) |
|
lc->log_dev_flush_failed = 1; |
|
} |
|
if (r) { |
|
DMWARN("%s: Failed to write header on dirty region log device", |
|
lc->log_dev->name); |
|
fail_log_device(lc); |
|
} |
|
|
|
return r; |
|
} |
|
|
|
static uint32_t core_get_region_size(struct dm_dirty_log *log) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
return lc->region_size; |
|
} |
|
|
|
static int core_resume(struct dm_dirty_log *log) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
lc->sync_search = 0; |
|
return 0; |
|
} |
|
|
|
static int core_is_clean(struct dm_dirty_log *log, region_t region) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
return log_test_bit(lc->clean_bits, region); |
|
} |
|
|
|
static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
return log_test_bit(lc->sync_bits, region); |
|
} |
|
|
|
static int core_flush(struct dm_dirty_log *log) |
|
{ |
|
/* no op */ |
|
return 0; |
|
} |
|
|
|
static int disk_flush(struct dm_dirty_log *log) |
|
{ |
|
int r, i; |
|
struct log_c *lc = log->context; |
|
|
|
/* only write if the log has changed */ |
|
if (!lc->touched_cleaned && !lc->touched_dirtied) |
|
return 0; |
|
|
|
if (lc->touched_cleaned && log->flush_callback_fn && |
|
log->flush_callback_fn(lc->ti)) { |
|
/* |
|
* At this point it is impossible to determine which |
|
* regions are clean and which are dirty (without |
|
* re-reading the log off disk). So mark all of them |
|
* dirty. |
|
*/ |
|
lc->flush_failed = 1; |
|
for (i = 0; i < lc->region_count; i++) |
|
log_clear_bit(lc, lc->clean_bits, i); |
|
} |
|
|
|
r = rw_header(lc, REQ_OP_WRITE); |
|
if (r) |
|
fail_log_device(lc); |
|
else { |
|
if (lc->touched_dirtied) { |
|
r = flush_header(lc); |
|
if (r) { |
|
lc->log_dev_flush_failed = 1; |
|
fail_log_device(lc); |
|
} else |
|
lc->touched_dirtied = 0; |
|
} |
|
lc->touched_cleaned = 0; |
|
} |
|
|
|
return r; |
|
} |
|
|
|
static void core_mark_region(struct dm_dirty_log *log, region_t region) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
log_clear_bit(lc, lc->clean_bits, region); |
|
} |
|
|
|
static void core_clear_region(struct dm_dirty_log *log, region_t region) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
if (likely(!lc->flush_failed)) |
|
log_set_bit(lc, lc->clean_bits, region); |
|
} |
|
|
|
static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
|
|
if (lc->sync_search >= lc->region_count) |
|
return 0; |
|
|
|
do { |
|
*region = find_next_zero_bit_le(lc->sync_bits, |
|
lc->region_count, |
|
lc->sync_search); |
|
lc->sync_search = *region + 1; |
|
|
|
if (*region >= lc->region_count) |
|
return 0; |
|
|
|
} while (log_test_bit(lc->recovering_bits, *region)); |
|
|
|
log_set_bit(lc, lc->recovering_bits, *region); |
|
return 1; |
|
} |
|
|
|
static void core_set_region_sync(struct dm_dirty_log *log, region_t region, |
|
int in_sync) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
|
|
log_clear_bit(lc, lc->recovering_bits, region); |
|
if (in_sync) { |
|
log_set_bit(lc, lc->sync_bits, region); |
|
lc->sync_count++; |
|
} else if (log_test_bit(lc->sync_bits, region)) { |
|
lc->sync_count--; |
|
log_clear_bit(lc, lc->sync_bits, region); |
|
} |
|
} |
|
|
|
static region_t core_get_sync_count(struct dm_dirty_log *log) |
|
{ |
|
struct log_c *lc = (struct log_c *) log->context; |
|
|
|
return lc->sync_count; |
|
} |
|
|
|
#define DMEMIT_SYNC \ |
|
if (lc->sync != DEFAULTSYNC) \ |
|
DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") |
|
|
|
static int core_status(struct dm_dirty_log *log, status_type_t status, |
|
char *result, unsigned int maxlen) |
|
{ |
|
int sz = 0; |
|
struct log_c *lc = log->context; |
|
|
|
switch(status) { |
|
case STATUSTYPE_INFO: |
|
DMEMIT("1 %s", log->type->name); |
|
break; |
|
|
|
case STATUSTYPE_TABLE: |
|
DMEMIT("%s %u %u ", log->type->name, |
|
lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); |
|
DMEMIT_SYNC; |
|
break; |
|
|
|
case STATUSTYPE_IMA: |
|
*result = '\0'; |
|
break; |
|
} |
|
|
|
return sz; |
|
} |
|
|
|
static int disk_status(struct dm_dirty_log *log, status_type_t status, |
|
char *result, unsigned int maxlen) |
|
{ |
|
int sz = 0; |
|
struct log_c *lc = log->context; |
|
|
|
switch(status) { |
|
case STATUSTYPE_INFO: |
|
DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
|
lc->log_dev_flush_failed ? 'F' : |
|
lc->log_dev_failed ? 'D' : |
|
'A'); |
|
break; |
|
|
|
case STATUSTYPE_TABLE: |
|
DMEMIT("%s %u %s %u ", log->type->name, |
|
lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
|
lc->region_size); |
|
DMEMIT_SYNC; |
|
break; |
|
|
|
case STATUSTYPE_IMA: |
|
*result = '\0'; |
|
break; |
|
} |
|
|
|
return sz; |
|
} |
|
|
|
static struct dm_dirty_log_type _core_type = { |
|
.name = "core", |
|
.module = THIS_MODULE, |
|
.ctr = core_ctr, |
|
.dtr = core_dtr, |
|
.resume = core_resume, |
|
.get_region_size = core_get_region_size, |
|
.is_clean = core_is_clean, |
|
.in_sync = core_in_sync, |
|
.flush = core_flush, |
|
.mark_region = core_mark_region, |
|
.clear_region = core_clear_region, |
|
.get_resync_work = core_get_resync_work, |
|
.set_region_sync = core_set_region_sync, |
|
.get_sync_count = core_get_sync_count, |
|
.status = core_status, |
|
}; |
|
|
|
static struct dm_dirty_log_type _disk_type = { |
|
.name = "disk", |
|
.module = THIS_MODULE, |
|
.ctr = disk_ctr, |
|
.dtr = disk_dtr, |
|
.postsuspend = disk_flush, |
|
.resume = disk_resume, |
|
.get_region_size = core_get_region_size, |
|
.is_clean = core_is_clean, |
|
.in_sync = core_in_sync, |
|
.flush = disk_flush, |
|
.mark_region = core_mark_region, |
|
.clear_region = core_clear_region, |
|
.get_resync_work = core_get_resync_work, |
|
.set_region_sync = core_set_region_sync, |
|
.get_sync_count = core_get_sync_count, |
|
.status = disk_status, |
|
}; |
|
|
|
static int __init dm_dirty_log_init(void) |
|
{ |
|
int r; |
|
|
|
r = dm_dirty_log_type_register(&_core_type); |
|
if (r) |
|
DMWARN("couldn't register core log"); |
|
|
|
r = dm_dirty_log_type_register(&_disk_type); |
|
if (r) { |
|
DMWARN("couldn't register disk type"); |
|
dm_dirty_log_type_unregister(&_core_type); |
|
} |
|
|
|
return r; |
|
} |
|
|
|
static void __exit dm_dirty_log_exit(void) |
|
{ |
|
dm_dirty_log_type_unregister(&_disk_type); |
|
dm_dirty_log_type_unregister(&_core_type); |
|
} |
|
|
|
module_init(dm_dirty_log_init); |
|
module_exit(dm_dirty_log_exit); |
|
|
|
MODULE_DESCRIPTION(DM_NAME " dirty region log"); |
|
MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|