Merge tag 'for-6.13/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mikulas Patocka:

 - remove unused functions and variables

 - rate-limit error messages in syslog

 - fix typo

 - remove u64 alignment requirement for murmurhash

 - reset bi_ioprio to the default for dm-vdo

 - add support for get_unique_id

 - Add missing destroy_work_on_stack() to dm-thin

 - use kmalloc to allocate power-of-two sized buffers in bufio

* tag 'for-6.13/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm-verity: remove the unused "data_start" variable
  dm-bufio: use kmalloc to allocate power-of-two sized buffers
  dm thin: Add missing destroy_work_on_stack()
  dm: add support for get_unique_id
  dm vdo: fix function doc comment formatting
  dm vdo int-map: remove unused parameters
  dm-vdo: reset bi_ioprio to the default value when the bio is reset
  dm-vdo murmurhash: remove u64 alignment requirement
  dm: Fix typo in error message
  dm ioctl: rate limit a couple of ioctl based error messages
  dm vdo: Remove unused uds_compute_index_size
  dm vdo: Remove unused functions
  dm: zoned: Remove unused functions
  dm: Remove unused dm_table_bio_based
  dm: Remove unused dm_set_md_type
  dm cache: Remove unused functions in bio-prison-v1
  dm cache: Remove unused dm_cache_size
  dm cache: Remove unused dm_cache_dump
  dm cache: Remove unused btracker_nr_writebacks_queued

Author: torvalds

drivers/md/dm-bio-prison-v1.c

@@ -198,15 +198,6 @@ int dm_bio_detain(struct dm_bio_prison *prison,
 }
 EXPORT_SYMBOL_GPL(dm_bio_detain);
 
-int dm_get_cell(struct dm_bio_prison *prison,
-		struct dm_cell_key *key,
-		struct dm_bio_prison_cell *cell_prealloc,
-		struct dm_bio_prison_cell **cell_result)
-{
-	return bio_detain(prison, key, NULL, cell_prealloc, cell_result);
-}
-EXPORT_SYMBOL_GPL(dm_get_cell);
-
 /*
  * @inmates must have been initialised prior to this call
  */
@@ -288,32 +279,6 @@ void dm_cell_visit_release(struct dm_bio_prison *prison,
 }
 EXPORT_SYMBOL_GPL(dm_cell_visit_release);
 
-static int __promote_or_release(struct rb_root *root,
-				struct dm_bio_prison_cell *cell)
-{
-	if (bio_list_empty(&cell->bios)) {
-		rb_erase(&cell->node, root);
-		return 1;
-	}
-
-	cell->holder = bio_list_pop(&cell->bios);
-	return 0;
-}
-
-int dm_cell_promote_or_release(struct dm_bio_prison *prison,
-			       struct dm_bio_prison_cell *cell)
-{
-	int r;
-	unsigned l = lock_nr(&cell->key, prison->num_locks);
-
-	spin_lock_irq(&prison->regions[l].lock);
-	r = __promote_or_release(&prison->regions[l].cell, cell);
-	spin_unlock_irq(&prison->regions[l].lock);
-
-	return r;
-}
-EXPORT_SYMBOL_GPL(dm_cell_promote_or_release);
-
 /*----------------------------------------------------------------*/
 
 #define DEFERRED_SET_SIZE 64

drivers/md/dm-bio-prison-v1.h

@@ -72,17 +72,6 @@ struct dm_bio_prison_cell *dm_bio_prison_alloc_cell(struct dm_bio_prison *prison
 void dm_bio_prison_free_cell(struct dm_bio_prison *prison,
 			     struct dm_bio_prison_cell *cell);
 
-/*
- * Creates, or retrieves a cell that overlaps the given key.
- *
- * Returns 1 if pre-existing cell returned, zero if new cell created using
- * @cell_prealloc.
- */
-int dm_get_cell(struct dm_bio_prison *prison,
-		struct dm_cell_key *key,
-		struct dm_bio_prison_cell *cell_prealloc,
-		struct dm_bio_prison_cell **cell_result);
-
 /*
  * Returns false if key is beyond BIO_PRISON_MAX_RANGE or spans a boundary.
  */
@@ -117,19 +106,6 @@ void dm_cell_visit_release(struct dm_bio_prison *prison,
 			   void (*visit_fn)(void *, struct dm_bio_prison_cell *),
 			   void *context, struct dm_bio_prison_cell *cell);
 
-/*
- * Rather than always releasing the prisoners in a cell, the client may
- * want to promote one of them to be the new holder.  There is a race here
- * though between releasing an empty cell, and other threads adding new
- * inmates.  So this function makes the decision with its lock held.
- *
- * This function can have two outcomes:
- * i) An inmate is promoted to be the holder of the cell (return value of 0).
- * ii) The cell has no inmate for promotion and is released (return value of 1).
- */
-int dm_cell_promote_or_release(struct dm_bio_prison *prison,
-			       struct dm_bio_prison_cell *cell);
-
 /*----------------------------------------------------------------*/
 
 /*

drivers/md/dm-bufio.c

@@ -318,9 +318,10 @@ static struct lru_entry *lru_evict(struct lru *lru, le_predicate pred, void *con
  */
 enum data_mode {
 	DATA_MODE_SLAB = 0,
-	DATA_MODE_GET_FREE_PAGES = 1,
-	DATA_MODE_VMALLOC = 2,
-	DATA_MODE_LIMIT = 3
+	DATA_MODE_KMALLOC = 1,
+	DATA_MODE_GET_FREE_PAGES = 2,
+	DATA_MODE_VMALLOC = 3,
+	DATA_MODE_LIMIT = 4
 };
 
 struct dm_buffer {
@@ -1062,6 +1063,7 @@ static unsigned long dm_bufio_retain_bytes = DM_BUFIO_DEFAULT_RETAIN_BYTES;
 
 static unsigned long dm_bufio_peak_allocated;
 static unsigned long dm_bufio_allocated_kmem_cache;
+static unsigned long dm_bufio_allocated_kmalloc;
 static unsigned long dm_bufio_allocated_get_free_pages;
 static unsigned long dm_bufio_allocated_vmalloc;
 static unsigned long dm_bufio_current_allocated;
@@ -1104,6 +1106,7 @@ static void adjust_total_allocated(struct dm_buffer *b, bool unlink)
 
 	static unsigned long * const class_ptr[DATA_MODE_LIMIT] = {
 		&dm_bufio_allocated_kmem_cache,
+		&dm_bufio_allocated_kmalloc,
 		&dm_bufio_allocated_get_free_pages,
 		&dm_bufio_allocated_vmalloc,
 	};
@@ -1181,6 +1184,11 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask,
 		return kmem_cache_alloc(c->slab_cache, gfp_mask);
 	}
 
+	if (unlikely(c->block_size < PAGE_SIZE)) {
+		*data_mode = DATA_MODE_KMALLOC;
+		return kmalloc(c->block_size, gfp_mask | __GFP_RECLAIMABLE);
+	}
+
 	if (c->block_size <= KMALLOC_MAX_SIZE &&
 	    gfp_mask & __GFP_NORETRY) {
 		*data_mode = DATA_MODE_GET_FREE_PAGES;
@@ -1204,6 +1212,10 @@ static void free_buffer_data(struct dm_bufio_client *c,
 		kmem_cache_free(c->slab_cache, data);
 		break;
 
+	case DATA_MODE_KMALLOC:
+		kfree(data);
+		break;
+
 	case DATA_MODE_GET_FREE_PAGES:
 		free_pages((unsigned long)data,
 			   c->sectors_per_block_bits - (PAGE_SHIFT - SECTOR_SHIFT));
@@ -2519,8 +2531,7 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
 		goto bad_dm_io;
 	}
 
-	if (block_size <= KMALLOC_MAX_SIZE &&
-	    (block_size < PAGE_SIZE || !is_power_of_2(block_size))) {
+	if (block_size <= KMALLOC_MAX_SIZE && !is_power_of_2(block_size)) {
 		unsigned int align = min(1U << __ffs(block_size), (unsigned int)PAGE_SIZE);
 
 		snprintf(slab_name, sizeof(slab_name), "dm_bufio_cache-%u-%u",
@@ -2902,6 +2913,7 @@ static int __init dm_bufio_init(void)
 	__u64 mem;
 
 	dm_bufio_allocated_kmem_cache = 0;
+	dm_bufio_allocated_kmalloc = 0;
 	dm_bufio_allocated_get_free_pages = 0;
 	dm_bufio_allocated_vmalloc = 0;
 	dm_bufio_current_allocated = 0;
@@ -2990,6 +3002,9 @@ MODULE_PARM_DESC(peak_allocated_bytes, "Tracks the maximum allocated memory");
 module_param_named(allocated_kmem_cache_bytes, dm_bufio_allocated_kmem_cache, ulong, 0444);
 MODULE_PARM_DESC(allocated_kmem_cache_bytes, "Memory allocated with kmem_cache_alloc");
 
+module_param_named(allocated_kmalloc_bytes, dm_bufio_allocated_kmalloc, ulong, 0444);
+MODULE_PARM_DESC(allocated_kmalloc_bytes, "Memory allocated with kmalloc_alloc");
+
 module_param_named(allocated_get_free_pages_bytes, dm_bufio_allocated_get_free_pages, ulong, 0444);
 MODULE_PARM_DESC(allocated_get_free_pages_bytes, "Memory allocated with get_free_pages");
 

drivers/md/dm-cache-background-tracker.c

@@ -143,12 +143,6 @@ static void update_stats(struct background_tracker *b, struct policy_work *w, in
 	}
 }
 
-unsigned int btracker_nr_writebacks_queued(struct background_tracker *b)
-{
-	return atomic_read(&b->pending_writebacks);
-}
-EXPORT_SYMBOL_GPL(btracker_nr_writebacks_queued);
-
 unsigned int btracker_nr_demotions_queued(struct background_tracker *b)
 {
 	return atomic_read(&b->pending_demotes);

drivers/md/dm-cache-background-tracker.h

@@ -50,7 +50,6 @@ struct background_tracker *btracker_create(unsigned int max_work);
  */
 void btracker_destroy(struct background_tracker *b);
 
-unsigned int btracker_nr_writebacks_queued(struct background_tracker *b);
 unsigned int btracker_nr_demotions_queued(struct background_tracker *b);
 
 /*

drivers/md/dm-cache-metadata.c

@@ -1218,15 +1218,6 @@ int dm_cache_load_discards(struct dm_cache_metadata *cmd,
 	return r;
 }
 
-int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result)
-{
-	READ_LOCK(cmd);
-	*result = cmd->cache_blocks;
-	READ_UNLOCK(cmd);
-
-	return 0;
-}
-
 static int __remove(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
 {
 	int r;
@@ -1507,30 +1498,6 @@ int dm_cache_load_mappings(struct dm_cache_metadata *cmd,
 	return r;
 }
 
-static int __dump_mapping(void *context, uint64_t cblock, void *leaf)
-{
-	__le64 value;
-	dm_oblock_t oblock;
-	unsigned int flags;
-
-	memcpy(&value, leaf, sizeof(value));
-	unpack_value(value, &oblock, &flags);
-
-	return 0;
-}
-
-static int __dump_mappings(struct dm_cache_metadata *cmd)
-{
-	return dm_array_walk(&cmd->info, cmd->root, __dump_mapping, NULL);
-}
-
-void dm_cache_dump(struct dm_cache_metadata *cmd)
-{
-	READ_LOCK_VOID(cmd);
-	__dump_mappings(cmd);
-	READ_UNLOCK(cmd);
-}
-
 int dm_cache_changed_this_transaction(struct dm_cache_metadata *cmd)
 {
 	int r;

drivers/md/dm-cache-metadata.h

@@ -71,7 +71,6 @@ void dm_cache_metadata_close(struct dm_cache_metadata *cmd);
  * origin blocks to map to.
  */
 int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size);
-int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result);
 
 int dm_cache_discard_bitset_resize(struct dm_cache_metadata *cmd,
 				   sector_t discard_block_size,
@@ -123,8 +122,6 @@ int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd,
 int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd,
 				   dm_block_t *result);
 
-void dm_cache_dump(struct dm_cache_metadata *cmd);
-
 /*
  * The policy is invited to save a 32bit hint value for every cblock (eg,
  * for a hit count).  These are stored against the policy name.  If

drivers/md/dm-ioctl.c

@@ -1912,7 +1912,7 @@ static int check_version(unsigned int cmd, struct dm_ioctl __user *user,
 
 	if ((kernel_params->version[0] != DM_VERSION_MAJOR) ||
 	    (kernel_params->version[1] > DM_VERSION_MINOR)) {
-		DMERR("ioctl interface mismatch: kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)",
+		DMERR_LIMIT("ioctl interface mismatch: kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)",
 		      DM_VERSION_MAJOR, DM_VERSION_MINOR,
 		      DM_VERSION_PATCHLEVEL,
 		      kernel_params->version[0],
@@ -1961,7 +1961,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
 
 	if (unlikely(param_kernel->data_size < minimum_data_size) ||
 	    unlikely(param_kernel->data_size > DM_MAX_TARGETS * DM_MAX_TARGET_PARAMS)) {
-		DMERR("Invalid data size in the ioctl structure: %u",
+		DMERR_LIMIT("Invalid data size in the ioctl structure: %u",
 		      param_kernel->data_size);
 		return -EINVAL;
 	}

drivers/md/dm-table.c

@@ -1033,11 +1033,6 @@ struct dm_target *dm_table_get_wildcard_target(struct dm_table *t)
 	return NULL;
 }
 
-bool dm_table_bio_based(struct dm_table *t)
-{
-	return __table_type_bio_based(dm_table_get_type(t));
-}
-
 bool dm_table_request_based(struct dm_table *t)
 {
 	return __table_type_request_based(dm_table_get_type(t));

drivers/md/dm-thin.c

@@ -2484,6 +2484,7 @@ static void pool_work_wait(struct pool_work *pw, struct pool *pool,
 	init_completion(&pw->complete);
 	queue_work(pool->wq, &pw->worker);
 	wait_for_completion(&pw->complete);
+	destroy_work_on_stack(&pw->worker);
 }
 
 /*----------------------------------------------------------------*/