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v6.8
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2001-2002 Sistina Software (UK) Limited.
  4 * Copyright (C) 2006-2008 Red Hat GmbH
  5 *
  6 * This file is released under the GPL.
  7 */
  8
  9#include "dm-exception-store.h"
 10
 11#include <linux/mm.h>
 12#include <linux/pagemap.h>
 13#include <linux/vmalloc.h>
 14#include <linux/export.h>
 15#include <linux/slab.h>
 16#include <linux/dm-io.h>
 17
 18#define DM_MSG_PREFIX "transient snapshot"
 19
 20/*
 21 *---------------------------------------------------------------
 22 * Implementation of the store for non-persistent snapshots.
 23 *---------------------------------------------------------------
 24 */
 25struct transient_c {
 26	sector_t next_free;
 27};
 28
 29static void transient_dtr(struct dm_exception_store *store)
 30{
 31	kfree(store->context);
 32}
 33
 34static int transient_read_metadata(struct dm_exception_store *store,
 35				   int (*callback)(void *callback_context,
 36						   chunk_t old, chunk_t new),
 37				   void *callback_context)
 38{
 39	return 0;
 40}
 41
 42static int transient_prepare_exception(struct dm_exception_store *store,
 43				       struct dm_exception *e)
 44{
 45	struct transient_c *tc = store->context;
 46	sector_t size = get_dev_size(dm_snap_cow(store->snap)->bdev);
 47
 48	if (size < (tc->next_free + store->chunk_size))
 49		return -1;
 50
 51	e->new_chunk = sector_to_chunk(store, tc->next_free);
 52	tc->next_free += store->chunk_size;
 53
 54	return 0;
 55}
 56
 57static void transient_commit_exception(struct dm_exception_store *store,
 58				       struct dm_exception *e, int valid,
 59				       void (*callback)(void *, int success),
 60				       void *callback_context)
 61{
 62	/* Just succeed */
 63	callback(callback_context, valid);
 64}
 65
 66static void transient_usage(struct dm_exception_store *store,
 67			    sector_t *total_sectors,
 68			    sector_t *sectors_allocated,
 69			    sector_t *metadata_sectors)
 70{
 71	*sectors_allocated = ((struct transient_c *) store->context)->next_free;
 72	*total_sectors = get_dev_size(dm_snap_cow(store->snap)->bdev);
 73	*metadata_sectors = 0;
 74}
 75
 76static int transient_ctr(struct dm_exception_store *store, char *options)
 77{
 78	struct transient_c *tc;
 79
 80	tc = kmalloc(sizeof(struct transient_c), GFP_KERNEL);
 81	if (!tc)
 82		return -ENOMEM;
 83
 84	tc->next_free = 0;
 85	store->context = tc;
 86
 87	return 0;
 88}
 89
 90static unsigned int transient_status(struct dm_exception_store *store,
 91				 status_type_t status, char *result,
 92				 unsigned int maxlen)
 93{
 94	unsigned int sz = 0;
 95
 96	switch (status) {
 97	case STATUSTYPE_INFO:
 98		break;
 99	case STATUSTYPE_TABLE:
100		DMEMIT(" N %llu", (unsigned long long)store->chunk_size);
101		break;
102	case STATUSTYPE_IMA:
103		*result = '\0';
104		break;
105	}
106
107	return sz;
108}
109
110static struct dm_exception_store_type _transient_type = {
111	.name = "transient",
112	.module = THIS_MODULE,
113	.ctr = transient_ctr,
114	.dtr = transient_dtr,
115	.read_metadata = transient_read_metadata,
116	.prepare_exception = transient_prepare_exception,
117	.commit_exception = transient_commit_exception,
118	.usage = transient_usage,
119	.status = transient_status,
120};
121
122static struct dm_exception_store_type _transient_compat_type = {
123	.name = "N",
124	.module = THIS_MODULE,
125	.ctr = transient_ctr,
126	.dtr = transient_dtr,
127	.read_metadata = transient_read_metadata,
128	.prepare_exception = transient_prepare_exception,
129	.commit_exception = transient_commit_exception,
130	.usage = transient_usage,
131	.status = transient_status,
132};
133
134int dm_transient_snapshot_init(void)
135{
136	int r;
137
138	r = dm_exception_store_type_register(&_transient_type);
139	if (r) {
140		DMWARN("Unable to register transient exception store type");
141		return r;
142	}
143
144	r = dm_exception_store_type_register(&_transient_compat_type);
145	if (r) {
146		DMWARN("Unable to register old-style transient exception store type");
147		dm_exception_store_type_unregister(&_transient_type);
148		return r;
149	}
150
151	return r;
152}
153
154void dm_transient_snapshot_exit(void)
155{
156	dm_exception_store_type_unregister(&_transient_type);
157	dm_exception_store_type_unregister(&_transient_compat_type);
158}
v6.13.7
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2001-2002 Sistina Software (UK) Limited.
  4 * Copyright (C) 2006-2008 Red Hat GmbH
  5 *
  6 * This file is released under the GPL.
  7 */
  8
  9#include "dm-exception-store.h"
 10
 11#include <linux/mm.h>
 12#include <linux/pagemap.h>
 13#include <linux/vmalloc.h>
 14#include <linux/export.h>
 15#include <linux/slab.h>
 16#include <linux/dm-io.h>
 17
 18#define DM_MSG_PREFIX "transient snapshot"
 19
 20/*
 21 *---------------------------------------------------------------
 22 * Implementation of the store for non-persistent snapshots.
 23 *---------------------------------------------------------------
 24 */
 25struct transient_c {
 26	sector_t next_free;
 27};
 28
 29static void transient_dtr(struct dm_exception_store *store)
 30{
 31	kfree(store->context);
 32}
 33
 34static int transient_read_metadata(struct dm_exception_store *store,
 35				   int (*callback)(void *callback_context,
 36						   chunk_t old, chunk_t new),
 37				   void *callback_context)
 38{
 39	return 0;
 40}
 41
 42static int transient_prepare_exception(struct dm_exception_store *store,
 43				       struct dm_exception *e)
 44{
 45	struct transient_c *tc = store->context;
 46	sector_t size = get_dev_size(dm_snap_cow(store->snap)->bdev);
 47
 48	if (size < (tc->next_free + store->chunk_size))
 49		return -1;
 50
 51	e->new_chunk = sector_to_chunk(store, tc->next_free);
 52	tc->next_free += store->chunk_size;
 53
 54	return 0;
 55}
 56
 57static void transient_commit_exception(struct dm_exception_store *store,
 58				       struct dm_exception *e, int valid,
 59				       void (*callback)(void *, int success),
 60				       void *callback_context)
 61{
 62	/* Just succeed */
 63	callback(callback_context, valid);
 64}
 65
 66static void transient_usage(struct dm_exception_store *store,
 67			    sector_t *total_sectors,
 68			    sector_t *sectors_allocated,
 69			    sector_t *metadata_sectors)
 70{
 71	*sectors_allocated = ((struct transient_c *) store->context)->next_free;
 72	*total_sectors = get_dev_size(dm_snap_cow(store->snap)->bdev);
 73	*metadata_sectors = 0;
 74}
 75
 76static int transient_ctr(struct dm_exception_store *store, char *options)
 77{
 78	struct transient_c *tc;
 79
 80	tc = kmalloc(sizeof(struct transient_c), GFP_KERNEL);
 81	if (!tc)
 82		return -ENOMEM;
 83
 84	tc->next_free = 0;
 85	store->context = tc;
 86
 87	return 0;
 88}
 89
 90static unsigned int transient_status(struct dm_exception_store *store,
 91				 status_type_t status, char *result,
 92				 unsigned int maxlen)
 93{
 94	unsigned int sz = 0;
 95
 96	switch (status) {
 97	case STATUSTYPE_INFO:
 98		break;
 99	case STATUSTYPE_TABLE:
100		DMEMIT(" N %llu", (unsigned long long)store->chunk_size);
101		break;
102	case STATUSTYPE_IMA:
103		*result = '\0';
104		break;
105	}
106
107	return sz;
108}
109
110static struct dm_exception_store_type _transient_type = {
111	.name = "transient",
112	.module = THIS_MODULE,
113	.ctr = transient_ctr,
114	.dtr = transient_dtr,
115	.read_metadata = transient_read_metadata,
116	.prepare_exception = transient_prepare_exception,
117	.commit_exception = transient_commit_exception,
118	.usage = transient_usage,
119	.status = transient_status,
120};
121
122static struct dm_exception_store_type _transient_compat_type = {
123	.name = "N",
124	.module = THIS_MODULE,
125	.ctr = transient_ctr,
126	.dtr = transient_dtr,
127	.read_metadata = transient_read_metadata,
128	.prepare_exception = transient_prepare_exception,
129	.commit_exception = transient_commit_exception,
130	.usage = transient_usage,
131	.status = transient_status,
132};
133
134int dm_transient_snapshot_init(void)
135{
136	int r;
137
138	r = dm_exception_store_type_register(&_transient_type);
139	if (r) {
140		DMWARN("Unable to register transient exception store type");
141		return r;
142	}
143
144	r = dm_exception_store_type_register(&_transient_compat_type);
145	if (r) {
146		DMWARN("Unable to register old-style transient exception store type");
147		dm_exception_store_type_unregister(&_transient_type);
148		return r;
149	}
150
151	return r;
152}
153
154void dm_transient_snapshot_exit(void)
155{
156	dm_exception_store_type_unregister(&_transient_type);
157	dm_exception_store_type_unregister(&_transient_compat_type);
158}