^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Copyright (C) 2001-2002 Sistina Software (UK) Limited.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2006-2008 Red Hat GmbH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This file is released under the GPL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "dm-exception-store.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define DM_MSG_PREFIX "snapshot exception stores"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static LIST_HEAD(_exception_store_types);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static DEFINE_SPINLOCK(_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct dm_exception_store_type *__find_exception_store_type(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct dm_exception_store_type *type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) list_for_each_entry(type, &_exception_store_types, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) if (!strcmp(name, type->name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static struct dm_exception_store_type *_get_exception_store_type(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct dm_exception_store_type *type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) spin_lock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) type = __find_exception_store_type(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (type && !try_module_get(type->module))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) type = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) spin_unlock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * get_type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * @type_name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * Attempt to retrieve the dm_exception_store_type by name. If not already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * available, attempt to load the appropriate module.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Exstore modules are named "dm-exstore-" followed by the 'type_name'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * Modules may contain multiple types.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * This function will first try the module "dm-exstore-<type_name>",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * then truncate 'type_name' on the last '-' and try again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * For example, if type_name was "clustered-shared", it would search
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * 'dm-exstore-clustered-shared' then 'dm-exstore-clustered'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * 'dm-exception-store-<type_name>' is too long of a name in my
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * opinion, which is why I've chosen to have the files
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * containing exception store implementations be 'dm-exstore-<type_name>'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * If you want your module to be autoloaded, you will follow this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * naming convention.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * Returns: dm_exception_store_type* on success, NULL on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static struct dm_exception_store_type *get_type(const char *type_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) char *p, *type_name_dup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct dm_exception_store_type *type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) type = _get_exception_store_type(type_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) type_name_dup = kstrdup(type_name, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (!type_name_dup) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) DMERR("No memory left to attempt load for \"%s\"", type_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) while (request_module("dm-exstore-%s", type_name_dup) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) !(type = _get_exception_store_type(type_name))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) p = strrchr(type_name_dup, '-');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) p[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (!type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) DMWARN("Module for exstore type \"%s\" not found.", type_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) kfree(type_name_dup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static void put_type(struct dm_exception_store_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) spin_lock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) module_put(type->module);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) spin_unlock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int dm_exception_store_type_register(struct dm_exception_store_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int r = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) spin_lock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (!__find_exception_store_type(type->name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) list_add(&type->list, &_exception_store_types);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) r = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) spin_unlock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) EXPORT_SYMBOL(dm_exception_store_type_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int dm_exception_store_type_unregister(struct dm_exception_store_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) spin_lock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!__find_exception_store_type(type->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) spin_unlock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) list_del(&type->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) spin_unlock(&_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) EXPORT_SYMBOL(dm_exception_store_type_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static int set_chunk_size(struct dm_exception_store *store,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) const char *chunk_size_arg, char **error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) unsigned chunk_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (kstrtouint(chunk_size_arg, 10, &chunk_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) *error = "Invalid chunk size";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (!chunk_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) store->chunk_size = store->chunk_mask = store->chunk_shift = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return dm_exception_store_set_chunk_size(store, chunk_size, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) unsigned chunk_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) char **error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /* Check chunk_size is a power of 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (!is_power_of_2(chunk_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) *error = "Chunk size is not a power of 2";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /* Validate the chunk size against the device block size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (chunk_size %
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) (bdev_logical_block_size(dm_snap_cow(store->snap)->bdev) >> 9) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) chunk_size %
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) (bdev_logical_block_size(dm_snap_origin(store->snap)->bdev) >> 9)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) *error = "Chunk size is not a multiple of device blocksize";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (chunk_size > INT_MAX >> SECTOR_SHIFT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) *error = "Chunk size is too high";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) store->chunk_size = chunk_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) store->chunk_mask = chunk_size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) store->chunk_shift = __ffs(chunk_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct dm_snapshot *snap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) unsigned *args_used,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct dm_exception_store **store)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) int r = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct dm_exception_store_type *type = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct dm_exception_store *tmp_store;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) char persistent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (argc < 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) ti->error = "Insufficient exception store arguments";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) tmp_store = kzalloc(sizeof(*tmp_store), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (!tmp_store) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) ti->error = "Exception store allocation failed";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) persistent = toupper(*argv[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (persistent == 'P')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) type = get_type("P");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) else if (persistent == 'N')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) type = get_type("N");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ti->error = "Exception store type is not P or N";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) goto bad_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (!type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) ti->error = "Exception store type not recognised";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) goto bad_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) tmp_store->type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) tmp_store->snap = snap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) r = set_chunk_size(tmp_store, argv[1], &ti->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) r = type->ctr(tmp_store, (strlen(argv[0]) > 1 ? &argv[0][1] : NULL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) ti->error = "Exception store type constructor failed";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) *args_used = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) *store = tmp_store;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) bad:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) put_type(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) bad_type:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) kfree(tmp_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) EXPORT_SYMBOL(dm_exception_store_create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) void dm_exception_store_destroy(struct dm_exception_store *store)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) store->type->dtr(store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) put_type(store->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) kfree(store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) EXPORT_SYMBOL(dm_exception_store_destroy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) int dm_exception_store_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) r = dm_transient_snapshot_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) DMERR("Unable to register transient exception store type.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) goto transient_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) r = dm_persistent_snapshot_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) DMERR("Unable to register persistent exception store type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) goto persistent_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) persistent_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) dm_transient_snapshot_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) transient_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) void dm_exception_store_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) dm_persistent_snapshot_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) dm_transient_snapshot_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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