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-rw-r--r--drivers/md/dm-log.c896
1 files changed, 896 insertions, 0 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
new file mode 100644
index 000000000..05141eea1
--- /dev/null
+++ b/drivers/md/dm-log.c
@@ -0,0 +1,896 @@
+/*
+ * Copyright (C) 2003 Sistina Software
+ * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
+ *
+ * This file is released under the LGPL.
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/dm-io.h>
+#include <linux/dm-dirty-log.h>
+
+#include <linux/device-mapper.h>
+
+#define DM_MSG_PREFIX "dirty region log"
+
+static LIST_HEAD(_log_types);
+static DEFINE_SPINLOCK(_lock);
+
+static struct dm_dirty_log_type *__find_dirty_log_type(const char *name)
+{
+ struct dm_dirty_log_type *log_type;
+
+ list_for_each_entry(log_type, &_log_types, list)
+ if (!strcmp(name, log_type->name))
+ return log_type;
+
+ return NULL;
+}
+
+static struct dm_dirty_log_type *_get_dirty_log_type(const char *name)
+{
+ struct dm_dirty_log_type *log_type;
+
+ spin_lock(&_lock);
+
+ log_type = __find_dirty_log_type(name);
+ if (log_type && !try_module_get(log_type->module))
+ log_type = NULL;
+
+ spin_unlock(&_lock);
+
+ return log_type;
+}
+
+/*
+ * get_type
+ * @type_name
+ *
+ * Attempt to retrieve the dm_dirty_log_type by name. If not already
+ * available, attempt to load the appropriate module.
+ *
+ * Log modules are named "dm-log-" followed by the 'type_name'.
+ * Modules may contain multiple types.
+ * This function will first try the module "dm-log-<type_name>",
+ * then truncate 'type_name' on the last '-' and try again.
+ *
+ * For example, if type_name was "clustered-disk", it would search
+ * 'dm-log-clustered-disk' then 'dm-log-clustered'.
+ *
+ * Returns: dirty_log_type* on success, NULL on failure
+ */
+static struct dm_dirty_log_type *get_type(const char *type_name)
+{
+ char *p, *type_name_dup;
+ struct dm_dirty_log_type *log_type;
+
+ if (!type_name)
+ return NULL;
+
+ log_type = _get_dirty_log_type(type_name);
+ if (log_type)
+ return log_type;
+
+ type_name_dup = kstrdup(type_name, GFP_KERNEL);
+ if (!type_name_dup) {
+ DMWARN("No memory left to attempt log module load for \"%s\"",
+ type_name);
+ return NULL;
+ }
+
+ while (request_module("dm-log-%s", type_name_dup) ||
+ !(log_type = _get_dirty_log_type(type_name))) {
+ p = strrchr(type_name_dup, '-');
+ if (!p)
+ break;
+ p[0] = '\0';
+ }
+
+ if (!log_type)
+ DMWARN("Module for logging type \"%s\" not found.", type_name);
+
+ kfree(type_name_dup);
+
+ return log_type;
+}
+
+static void put_type(struct dm_dirty_log_type *type)
+{
+ if (!type)
+ return;
+
+ spin_lock(&_lock);
+ if (!__find_dirty_log_type(type->name))
+ goto out;
+
+ module_put(type->module);
+
+out:
+ spin_unlock(&_lock);
+}
+
+int dm_dirty_log_type_register(struct dm_dirty_log_type *type)
+{
+ int r = 0;
+
+ spin_lock(&_lock);
+ if (!__find_dirty_log_type(type->name))
+ list_add(&type->list, &_log_types);
+ else
+ r = -EEXIST;
+ spin_unlock(&_lock);
+
+ return r;
+}
+EXPORT_SYMBOL(dm_dirty_log_type_register);
+
+int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type)
+{
+ spin_lock(&_lock);
+
+ if (!__find_dirty_log_type(type->name)) {
+ spin_unlock(&_lock);
+ return -EINVAL;
+ }
+
+ list_del(&type->list);
+
+ spin_unlock(&_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(dm_dirty_log_type_unregister);
+
+struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
+ struct dm_target *ti,
+ int (*flush_callback_fn)(struct dm_target *ti),
+ unsigned int argc, char **argv)
+{
+ struct dm_dirty_log_type *type;
+ struct dm_dirty_log *log;
+
+ log = kmalloc(sizeof(*log), GFP_KERNEL);
+ if (!log)
+ return NULL;
+
+ type = get_type(type_name);
+ if (!type) {
+ kfree(log);
+ return NULL;
+ }
+
+ log->flush_callback_fn = flush_callback_fn;
+ log->type = type;
+ if (type->ctr(log, ti, argc, argv)) {
+ kfree(log);
+ put_type(type);
+ return NULL;
+ }
+
+ return log;
+}
+EXPORT_SYMBOL(dm_dirty_log_create);
+
+void dm_dirty_log_destroy(struct dm_dirty_log *log)
+{
+ log->type->dtr(log);
+ put_type(log->type);
+ kfree(log);
+}
+EXPORT_SYMBOL(dm_dirty_log_destroy);
+
+/*-----------------------------------------------------------------
+ * Persistent and core logs share a lot of their implementation.
+ * FIXME: need a reload method to be called from a resume
+ *---------------------------------------------------------------*/
+/*
+ * Magic for persistent mirrors: "MiRr"
+ */
+#define MIRROR_MAGIC 0x4D695272
+
+/*
+ * The on-disk version of the metadata.
+ */
+#define MIRROR_DISK_VERSION 2
+#define LOG_OFFSET 2
+
+struct log_header_disk {
+ __le32 magic;
+
+ /*
+ * Simple, incrementing version. no backward
+ * compatibility.
+ */
+ __le32 version;
+ __le64 nr_regions;
+} __packed;
+
+struct log_header_core {
+ uint32_t magic;
+ uint32_t version;
+ uint64_t nr_regions;
+};
+
+struct log_c {
+ struct dm_target *ti;
+ int touched_dirtied;
+ int touched_cleaned;
+ int flush_failed;
+ uint32_t region_size;
+ unsigned int region_count;
+ region_t sync_count;
+
+ unsigned int bitset_uint32_count;
+ uint32_t *clean_bits;
+ uint32_t *sync_bits;
+ uint32_t *recovering_bits; /* FIXME: this seems excessive */
+
+ int sync_search;
+
+ /* Resync flag */
+ enum sync {
+ DEFAULTSYNC, /* Synchronize if necessary */
+ NOSYNC, /* Devices known to be already in sync */
+ FORCESYNC, /* Force a sync to happen */
+ } sync;
+
+ struct dm_io_request io_req;
+
+ /*
+ * Disk log fields
+ */
+ int log_dev_failed;
+ int log_dev_flush_failed;
+ struct dm_dev *log_dev;
+ struct log_header_core header;
+
+ struct dm_io_region header_location;
+ struct log_header_disk *disk_header;
+};
+
+/*
+ * The touched member needs to be updated every time we access
+ * one of the bitsets.
+ */
+static inline int log_test_bit(uint32_t *bs, unsigned int bit)
+{
+ return test_bit_le(bit, bs) ? 1 : 0;
+}
+
+static inline void log_set_bit(struct log_c *l,
+ uint32_t *bs, unsigned int bit)
+{
+ __set_bit_le(bit, bs);
+ l->touched_cleaned = 1;
+}
+
+static inline void log_clear_bit(struct log_c *l,
+ uint32_t *bs, unsigned int bit)
+{
+ __clear_bit_le(bit, bs);
+ l->touched_dirtied = 1;
+}
+
+/*----------------------------------------------------------------
+ * Header IO
+ *--------------------------------------------------------------*/
+static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk)
+{
+ disk->magic = cpu_to_le32(core->magic);
+ disk->version = cpu_to_le32(core->version);
+ disk->nr_regions = cpu_to_le64(core->nr_regions);
+}
+
+static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk)
+{
+ core->magic = le32_to_cpu(disk->magic);
+ core->version = le32_to_cpu(disk->version);
+ core->nr_regions = le64_to_cpu(disk->nr_regions);
+}
+
+static int rw_header(struct log_c *lc, enum req_op op)
+{
+ lc->io_req.bi_opf = op;
+
+ return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
+}
+
+static int flush_header(struct log_c *lc)
+{
+ struct dm_io_region null_location = {
+ .bdev = lc->header_location.bdev,
+ .sector = 0,
+ .count = 0,
+ };
+
+ lc->io_req.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
+
+ return dm_io(&lc->io_req, 1, &null_location, NULL);
+}
+
+static int read_header(struct log_c *log)
+{
+ int r;
+
+ r = rw_header(log, REQ_OP_READ);
+ if (r)
+ return r;
+
+ header_from_disk(&log->header, log->disk_header);
+
+ /* New log required? */
+ if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) {
+ log->header.magic = MIRROR_MAGIC;
+ log->header.version = MIRROR_DISK_VERSION;
+ log->header.nr_regions = 0;
+ }
+
+#ifdef __LITTLE_ENDIAN
+ if (log->header.version == 1)
+ log->header.version = 2;
+#endif
+
+ if (log->header.version != MIRROR_DISK_VERSION) {
+ DMWARN("incompatible disk log version");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int _check_region_size(struct dm_target *ti, uint32_t region_size)
+{
+ if (region_size < 2 || region_size > ti->len)
+ return 0;
+
+ if (!is_power_of_2(region_size))
+ return 0;
+
+ return 1;
+}
+
+/*----------------------------------------------------------------
+ * core log constructor/destructor
+ *
+ * argv contains region_size followed optionally by [no]sync
+ *--------------------------------------------------------------*/
+#define BYTE_SHIFT 3
+static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
+ unsigned int argc, char **argv,
+ struct dm_dev *dev)
+{
+ enum sync sync = DEFAULTSYNC;
+
+ struct log_c *lc;
+ uint32_t region_size;
+ unsigned int region_count;
+ size_t bitset_size, buf_size;
+ int r;
+ char dummy;
+
+ if (argc < 1 || argc > 2) {
+ DMWARN("wrong number of arguments to dirty region log");
+ return -EINVAL;
+ }
+
+ if (argc > 1) {
+ if (!strcmp(argv[1], "sync"))
+ sync = FORCESYNC;
+ else if (!strcmp(argv[1], "nosync"))
+ sync = NOSYNC;
+ else {
+ DMWARN("unrecognised sync argument to dirty region log: %s", argv[1]);
+ return -EINVAL;
+ }
+ }
+
+ if (sscanf(argv[0], "%u%c", &region_size, &dummy) != 1 ||
+ !_check_region_size(ti, region_size)) {
+ DMWARN("invalid region size %s", argv[0]);
+ return -EINVAL;
+ }
+
+ region_count = dm_sector_div_up(ti->len, region_size);
+
+ lc = kmalloc(sizeof(*lc), GFP_KERNEL);
+ if (!lc) {
+ DMWARN("couldn't allocate core log");
+ return -ENOMEM;
+ }
+
+ lc->ti = ti;
+ lc->touched_dirtied = 0;
+ lc->touched_cleaned = 0;
+ lc->flush_failed = 0;
+ lc->region_size = region_size;
+ lc->region_count = region_count;
+ lc->sync = sync;
+
+ /*
+ * Work out how many "unsigned long"s we need to hold the bitset.
+ */
+ bitset_size = dm_round_up(region_count, BITS_PER_LONG);
+ bitset_size >>= BYTE_SHIFT;
+
+ lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits);
+
+ /*
+ * Disk log?
+ */
+ if (!dev) {
+ lc->clean_bits = vmalloc(bitset_size);
+ if (!lc->clean_bits) {
+ DMWARN("couldn't allocate clean bitset");
+ kfree(lc);
+ return -ENOMEM;
+ }
+ lc->disk_header = NULL;
+ } else {
+ lc->log_dev = dev;
+ lc->log_dev_failed = 0;
+ lc->log_dev_flush_failed = 0;
+ lc->header_location.bdev = lc->log_dev->bdev;
+ lc->header_location.sector = 0;
+
+ /*
+ * Buffer holds both header and bitset.
+ */
+ buf_size =
+ dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size,
+ bdev_logical_block_size(lc->header_location.
+ bdev));
+
+ if (buf_size > bdev_nr_bytes(dev->bdev)) {
+ DMWARN("log device %s too small: need %llu bytes",
+ dev->name, (unsigned long long)buf_size);
+ kfree(lc);
+ return -EINVAL;
+ }
+
+ lc->header_location.count = buf_size >> SECTOR_SHIFT;
+
+ lc->io_req.mem.type = DM_IO_VMA;
+ lc->io_req.notify.fn = NULL;
+ lc->io_req.client = dm_io_client_create();
+ if (IS_ERR(lc->io_req.client)) {
+ r = PTR_ERR(lc->io_req.client);
+ DMWARN("couldn't allocate disk io client");
+ kfree(lc);
+ return r;
+ }
+
+ lc->disk_header = vmalloc(buf_size);
+ if (!lc->disk_header) {
+ DMWARN("couldn't allocate disk log buffer");
+ dm_io_client_destroy(lc->io_req.client);
+ kfree(lc);
+ return -ENOMEM;
+ }
+
+ lc->io_req.mem.ptr.vma = lc->disk_header;
+ lc->clean_bits = (void *)lc->disk_header +
+ (LOG_OFFSET << SECTOR_SHIFT);
+ }
+
+ memset(lc->clean_bits, -1, bitset_size);
+
+ lc->sync_bits = vmalloc(bitset_size);
+ if (!lc->sync_bits) {
+ DMWARN("couldn't allocate sync bitset");
+ if (!dev)
+ vfree(lc->clean_bits);
+ else
+ dm_io_client_destroy(lc->io_req.client);
+ vfree(lc->disk_header);
+ kfree(lc);
+ return -ENOMEM;
+ }
+ memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size);
+ lc->sync_count = (sync == NOSYNC) ? region_count : 0;
+
+ lc->recovering_bits = vzalloc(bitset_size);
+ if (!lc->recovering_bits) {
+ DMWARN("couldn't allocate sync bitset");
+ vfree(lc->sync_bits);
+ if (!dev)
+ vfree(lc->clean_bits);
+ else
+ dm_io_client_destroy(lc->io_req.client);
+ vfree(lc->disk_header);
+ kfree(lc);
+ return -ENOMEM;
+ }
+ lc->sync_search = 0;
+ log->context = lc;
+
+ return 0;
+}
+
+static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti,
+ unsigned int argc, char **argv)
+{
+ return create_log_context(log, ti, argc, argv, NULL);
+}
+
+static void destroy_log_context(struct log_c *lc)
+{
+ vfree(lc->sync_bits);
+ vfree(lc->recovering_bits);
+ kfree(lc);
+}
+
+static void core_dtr(struct dm_dirty_log *log)
+{
+ struct log_c *lc = (struct log_c *) log->context;
+
+ vfree(lc->clean_bits);
+ destroy_log_context(lc);
+}
+
+/*----------------------------------------------------------------
+ * disk log constructor/destructor
+ *
+ * argv contains log_device region_size followed optionally by [no]sync
+ *--------------------------------------------------------------*/
+static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti,
+ unsigned int argc, char **argv)
+{
+ int r;
+ struct dm_dev *dev;
+
+ if (argc < 2 || argc > 3) {
+ DMWARN("wrong number of arguments to disk dirty region log");
+ return -EINVAL;
+ }
+
+ r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev);
+ if (r)
+ return r;
+
+ r = create_log_context(log, ti, argc - 1, argv + 1, dev);
+ if (r) {
+ dm_put_device(ti, dev);
+ return r;
+ }
+
+ return 0;
+}
+
+static void disk_dtr(struct dm_dirty_log *log)
+{
+ struct log_c *lc = (struct log_c *) log->context;
+
+ dm_put_device(lc->ti, lc->log_dev);
+ vfree(lc->disk_header);
+ dm_io_client_destroy(lc->io_req.client);
+ destroy_log_context(lc);
+}
+
+static void fail_log_device(struct log_c *lc)
+{
+ if (lc->log_dev_failed)
+ return;
+
+ lc->log_dev_failed = 1;
+ dm_table_event(lc->ti->table);
+}
+
+static int disk_resume(struct dm_dirty_log *log)
+{
+ int r;
+ unsigned int i;
+ struct log_c *lc = (struct log_c *) log->context;
+ size_t size = lc->bitset_uint32_count * sizeof(uint32_t);
+
+ /* read the disk header */
+ r = read_header(lc);
+ if (r) {
+ DMWARN("%s: Failed to read header on dirty region log device",
+ lc->log_dev->name);
+ fail_log_device(lc);
+ /*
+ * If the log device cannot be read, we must assume
+ * all regions are out-of-sync. If we simply return
+ * here, the state will be uninitialized and could
+ * lead us to return 'in-sync' status for regions
+ * that are actually 'out-of-sync'.
+ */
+ lc->header.nr_regions = 0;
+ }
+
+ /* set or clear any new bits -- device has grown */
+ if (lc->sync == NOSYNC)
+ for (i = lc->header.nr_regions; i < lc->region_count; i++)
+ /* FIXME: amazingly inefficient */
+ log_set_bit(lc, lc->clean_bits, i);
+ else
+ for (i = lc->header.nr_regions; i < lc->region_count; i++)
+ /* FIXME: amazingly inefficient */
+ log_clear_bit(lc, lc->clean_bits, i);
+
+ /* clear any old bits -- device has shrunk */
+ for (i = lc->region_count; i % BITS_PER_LONG; 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 <dm-devel@redhat.com>");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 00:34:20 +0000