Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1577 deletions

diff --git a/ANDROID_3.4.5/drivers/md/dm-table.c b/ANDROID_3.4.5/drivers/md/dm-table.c
deleted file mode 100644
index 2e227fbf..00000000
--- a/ANDROID_3.4.5/drivers/md/dm-table.c
+++ /dev/null
@@ -1,1577 +0,0 @@
-/*
- * Copyright (C) 2001 Sistina Software (UK) Limited.
- * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
- *
- * This file is released under the GPL.
- */
-
-#include "dm.h"
-
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/blkdev.h>
-#include <linux/namei.h>
-#include <linux/ctype.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/mutex.h>
-#include <linux/delay.h>
-#include <linux/atomic.h>
-
-#define DM_MSG_PREFIX "table"
-
-#define MAX_DEPTH 16
-#define NODE_SIZE L1_CACHE_BYTES
-#define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t))
-#define CHILDREN_PER_NODE (KEYS_PER_NODE + 1)
-
-/*
- * The table has always exactly one reference from either mapped_device->map
- * or hash_cell->new_map. This reference is not counted in table->holders.
- * A pair of dm_create_table/dm_destroy_table functions is used for table
- * creation/destruction.
- *
- * Temporary references from the other code increase table->holders. A pair
- * of dm_table_get/dm_table_put functions is used to manipulate it.
- *
- * When the table is about to be destroyed, we wait for table->holders to
- * drop to zero.
- */
-
-struct dm_table {
-	struct mapped_device *md;
-	atomic_t holders;
-	unsigned type;
-
-	/* btree table */
-	unsigned int depth;
-	unsigned int counts[MAX_DEPTH];	/* in nodes */
-	sector_t *index[MAX_DEPTH];
-
-	unsigned int num_targets;
-	unsigned int num_allocated;
-	sector_t *highs;
-	struct dm_target *targets;
-
-	struct target_type *immutable_target_type;
-	unsigned integrity_supported:1;
-	unsigned singleton:1;
-
-	/*
-	 * Indicates the rw permissions for the new logical
-	 * device.  This should be a combination of FMODE_READ
-	 * and FMODE_WRITE.
-	 */
-	fmode_t mode;
-
-	/* a list of devices used by this table */
-	struct list_head devices;
-
-	/* events get handed up using this callback */
-	void (*event_fn)(void *);
-	void *event_context;
-
-	struct dm_md_mempools *mempools;
-
-	struct list_head target_callbacks;
-};
-
-/*
- * Similar to ceiling(log_size(n))
- */
-static unsigned int int_log(unsigned int n, unsigned int base)
-{
-	int result = 0;
-
-	while (n > 1) {
-		n = dm_div_up(n, base);
-		result++;
-	}
-
-	return result;
-}
-
-/*
- * Calculate the index of the child node of the n'th node k'th key.
- */
-static inline unsigned int get_child(unsigned int n, unsigned int k)
-{
-	return (n * CHILDREN_PER_NODE) + k;
-}
-
-/*
- * Return the n'th node of level l from table t.
- */
-static inline sector_t *get_node(struct dm_table *t,
-				 unsigned int l, unsigned int n)
-{
-	return t->index[l] + (n * KEYS_PER_NODE);
-}
-
-/*
- * Return the highest key that you could lookup from the n'th
- * node on level l of the btree.
- */
-static sector_t high(struct dm_table *t, unsigned int l, unsigned int n)
-{
-	for (; l < t->depth - 1; l++)
-		n = get_child(n, CHILDREN_PER_NODE - 1);
-
-	if (n >= t->counts[l])
-		return (sector_t) - 1;
-
-	return get_node(t, l, n)[KEYS_PER_NODE - 1];
-}
-
-/*
- * Fills in a level of the btree based on the highs of the level
- * below it.
- */
-static int setup_btree_index(unsigned int l, struct dm_table *t)
-{
-	unsigned int n, k;
-	sector_t *node;
-
-	for (n = 0U; n < t->counts[l]; n++) {
-		node = get_node(t, l, n);
-
-		for (k = 0U; k < KEYS_PER_NODE; k++)
-			node[k] = high(t, l + 1, get_child(n, k));
-	}
-
-	return 0;
-}
-
-void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size)
-{
-	unsigned long size;
-	void *addr;
-
-	/*
-	 * Check that we're not going to overflow.
-	 */
-	if (nmemb > (ULONG_MAX / elem_size))
-		return NULL;
-
-	size = nmemb * elem_size;
-	addr = vzalloc(size);
-
-	return addr;
-}
-EXPORT_SYMBOL(dm_vcalloc);
-
-/*
- * highs, and targets are managed as dynamic arrays during a
- * table load.
- */
-static int alloc_targets(struct dm_table *t, unsigned int num)
-{
-	sector_t *n_highs;
-	struct dm_target *n_targets;
-	int n = t->num_targets;
-
-	/*
-	 * Allocate both the target array and offset array at once.
-	 * Append an empty entry to catch sectors beyond the end of
-	 * the device.
-	 */
-	n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) +
-					  sizeof(sector_t));
-	if (!n_highs)
-		return -ENOMEM;
-
-	n_targets = (struct dm_target *) (n_highs + num);
-
-	if (n) {
-		memcpy(n_highs, t->highs, sizeof(*n_highs) * n);
-		memcpy(n_targets, t->targets, sizeof(*n_targets) * n);
-	}
-
-	memset(n_highs + n, -1, sizeof(*n_highs) * (num - n));
-	vfree(t->highs);
-
-	t->num_allocated = num;
-	t->highs = n_highs;
-	t->targets = n_targets;
-
-	return 0;
-}
-
-int dm_table_create(struct dm_table **result, fmode_t mode,
-		    unsigned num_targets, struct mapped_device *md)
-{
-	struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL);
-
-	if (!t)
-		return -ENOMEM;
-
-	INIT_LIST_HEAD(&t->devices);
-	INIT_LIST_HEAD(&t->target_callbacks);
-	atomic_set(&t->holders, 0);
-
-	if (!num_targets)
-		num_targets = KEYS_PER_NODE;
-
-	num_targets = dm_round_up(num_targets, KEYS_PER_NODE);
-
-	if (alloc_targets(t, num_targets)) {
-		kfree(t);
-		t = NULL;
-		return -ENOMEM;
-	}
-
-	t->mode = mode;
-	t->md = md;
-	*result = t;
-	return 0;
-}
-
-static void free_devices(struct list_head *devices)
-{
-	struct list_head *tmp, *next;
-
-	list_for_each_safe(tmp, next, devices) {
-		struct dm_dev_internal *dd =
-		    list_entry(tmp, struct dm_dev_internal, list);
-		DMWARN("dm_table_destroy: dm_put_device call missing for %s",
-		       dd->dm_dev.name);
-		kfree(dd);
-	}
-}
-
-void dm_table_destroy(struct dm_table *t)
-{
-	unsigned int i;
-
-	if (!t)
-		return;
-
-	while (atomic_read(&t->holders))
-		msleep(1);
-	smp_mb();
-
-	/* free the indexes */
-	if (t->depth >= 2)
-		vfree(t->index[t->depth - 2]);
-
-	/* free the targets */
-	for (i = 0; i < t->num_targets; i++) {
-		struct dm_target *tgt = t->targets + i;
-
-		if (tgt->type->dtr)
-			tgt->type->dtr(tgt);
-
-		dm_put_target_type(tgt->type);
-	}
-
-	vfree(t->highs);
-
-	/* free the device list */
-	free_devices(&t->devices);
-
-	dm_free_md_mempools(t->mempools);
-
-	kfree(t);
-}
-
-void dm_table_get(struct dm_table *t)
-{
-	atomic_inc(&t->holders);
-}
-EXPORT_SYMBOL(dm_table_get);
-
-void dm_table_put(struct dm_table *t)
-{
-	if (!t)
-		return;
-
-	smp_mb__before_atomic_dec();
-	atomic_dec(&t->holders);
-}
-EXPORT_SYMBOL(dm_table_put);
-
-/*
- * Checks to see if we need to extend highs or targets.
- */
-static inline int check_space(struct dm_table *t)
-{
-	if (t->num_targets >= t->num_allocated)
-		return alloc_targets(t, t->num_allocated * 2);
-
-	return 0;
-}
-
-/*
- * See if we've already got a device in the list.
- */
-static struct dm_dev_internal *find_device(struct list_head *l, dev_t dev)
-{
-	struct dm_dev_internal *dd;
-
-	list_for_each_entry (dd, l, list)
-		if (dd->dm_dev.bdev->bd_dev == dev)
-			return dd;
-
-	return NULL;
-}
-
-/*
- * Open a device so we can use it as a map destination.
- */
-static int open_dev(struct dm_dev_internal *d, dev_t dev,
-		    struct mapped_device *md)
-{
-	static char *_claim_ptr = "I belong to device-mapper";
-	struct block_device *bdev;
-
-	int r;
-
-	BUG_ON(d->dm_dev.bdev);
-
-	bdev = blkdev_get_by_dev(dev, d->dm_dev.mode | FMODE_EXCL, _claim_ptr);
-	if (IS_ERR(bdev))
-		return PTR_ERR(bdev);
-
-	r = bd_link_disk_holder(bdev, dm_disk(md));
-	if (r) {
-		blkdev_put(bdev, d->dm_dev.mode | FMODE_EXCL);
-		return r;
-	}
-
-	d->dm_dev.bdev = bdev;
-	return 0;
-}
-
-/*
- * Close a device that we've been using.
- */
-static void close_dev(struct dm_dev_internal *d, struct mapped_device *md)
-{
-	if (!d->dm_dev.bdev)
-		return;
-
-	bd_unlink_disk_holder(d->dm_dev.bdev, dm_disk(md));
-	blkdev_put(d->dm_dev.bdev, d->dm_dev.mode | FMODE_EXCL);
-	d->dm_dev.bdev = NULL;
-}
-
-/*
- * If possible, this checks an area of a destination device is invalid.
- */
-static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
-				  sector_t start, sector_t len, void *data)
-{
-	struct request_queue *q;
-	struct queue_limits *limits = data;
-	struct block_device *bdev = dev->bdev;
-	sector_t dev_size =
-		i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
-	unsigned short logical_block_size_sectors =
-		limits->logical_block_size >> SECTOR_SHIFT;
-	char b[BDEVNAME_SIZE];
-
-	/*
-	 * Some devices exist without request functions,
-	 * such as loop devices not yet bound to backing files.
-	 * Forbid the use of such devices.
-	 */
-	q = bdev_get_queue(bdev);
-	if (!q || !q->make_request_fn) {
-		DMWARN("%s: %s is not yet initialised: "
-		       "start=%llu, len=%llu, dev_size=%llu",
-		       dm_device_name(ti->table->md), bdevname(bdev, b),
-		       (unsigned long long)start,
-		       (unsigned long long)len,
-		       (unsigned long long)dev_size);
-		return 1;
-	}
-
-	if (!dev_size)
-		return 0;
-
-	if ((start >= dev_size) || (start + len > dev_size)) {
-		DMWARN("%s: %s too small for target: "
-		       "start=%llu, len=%llu, dev_size=%llu",
-		       dm_device_name(ti->table->md), bdevname(bdev, b),
-		       (unsigned long long)start,
-		       (unsigned long long)len,
-		       (unsigned long long)dev_size);
-		return 1;
-	}
-
-	if (logical_block_size_sectors <= 1)
-		return 0;
-
-	if (start & (logical_block_size_sectors - 1)) {
-		DMWARN("%s: start=%llu not aligned to h/w "
-		       "logical block size %u of %s",
-		       dm_device_name(ti->table->md),
-		       (unsigned long long)start,
-		       limits->logical_block_size, bdevname(bdev, b));
-		return 1;
-	}
-
-	if (len & (logical_block_size_sectors - 1)) {
-		DMWARN("%s: len=%llu not aligned to h/w "
-		       "logical block size %u of %s",
-		       dm_device_name(ti->table->md),
-		       (unsigned long long)len,
-		       limits->logical_block_size, bdevname(bdev, b));
-		return 1;
-	}
-
-	return 0;
-}
-
-/*
- * This upgrades the mode on an already open dm_dev, being
- * careful to leave things as they were if we fail to reopen the
- * device and not to touch the existing bdev field in case
- * it is accessed concurrently inside dm_table_any_congested().
- */
-static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode,
-			struct mapped_device *md)
-{
-	int r;
-	struct dm_dev_internal dd_new, dd_old;
-
-	dd_new = dd_old = *dd;
-
-	dd_new.dm_dev.mode |= new_mode;
-	dd_new.dm_dev.bdev = NULL;
-
-	r = open_dev(&dd_new, dd->dm_dev.bdev->bd_dev, md);
-	if (r)
-		return r;
-
-	dd->dm_dev.mode |= new_mode;
-	close_dev(&dd_old, md);
-
-	return 0;
-}
-
-/*
- * Add a device to the list, or just increment the usage count if
- * it's already present.
- */
-int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
-		  struct dm_dev **result)
-{
-	int r;
-	dev_t uninitialized_var(dev);
-	struct dm_dev_internal *dd;
-	unsigned int major, minor;
-	struct dm_table *t = ti->table;
-	char dummy;
-
-	BUG_ON(!t);
-
-	if (sscanf(path, "%u:%u%c", &major, &minor, &dummy) == 2) {
-		/* Extract the major/minor numbers */
-		dev = MKDEV(major, minor);
-		if (MAJOR(dev) != major || MINOR(dev) != minor)
-			return -EOVERFLOW;
-	} else {
-		/* convert the path to a device */
-		struct block_device *bdev = lookup_bdev(path);
-
-		if (IS_ERR(bdev))
-			return PTR_ERR(bdev);
-		dev = bdev->bd_dev;
-		bdput(bdev);
-	}
-
-	dd = find_device(&t->devices, dev);
-	if (!dd) {
-		dd = kmalloc(sizeof(*dd), GFP_KERNEL);
-		if (!dd)
-			return -ENOMEM;
-
-		dd->dm_dev.mode = mode;
-		dd->dm_dev.bdev = NULL;
-
-		if ((r = open_dev(dd, dev, t->md))) {
-			kfree(dd);
-			return r;
-		}
-
-		format_dev_t(dd->dm_dev.name, dev);
-
-		atomic_set(&dd->count, 0);
-		list_add(&dd->list, &t->devices);
-
-	} else if (dd->dm_dev.mode != (mode | dd->dm_dev.mode)) {
-		r = upgrade_mode(dd, mode, t->md);
-		if (r)
-			return r;
-	}
-	atomic_inc(&dd->count);
-
-	*result = &dd->dm_dev;
-	return 0;
-}
-EXPORT_SYMBOL(dm_get_device);
-
-int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
-			 sector_t start, sector_t len, void *data)
-{
-	struct queue_limits *limits = data;
-	struct block_device *bdev = dev->bdev;
-	struct request_queue *q = bdev_get_queue(bdev);
-	char b[BDEVNAME_SIZE];
-
-	if (unlikely(!q)) {
-		DMWARN("%s: Cannot set limits for nonexistent device %s",
-		       dm_device_name(ti->table->md), bdevname(bdev, b));
-		return 0;
-	}
-
-	if (bdev_stack_limits(limits, bdev, start) < 0)
-		DMWARN("%s: adding target device %s caused an alignment inconsistency: "
-		       "physical_block_size=%u, logical_block_size=%u, "
-		       "alignment_offset=%u, start=%llu",
-		       dm_device_name(ti->table->md), bdevname(bdev, b),
-		       q->limits.physical_block_size,
-		       q->limits.logical_block_size,
-		       q->limits.alignment_offset,
-		       (unsigned long long) start << SECTOR_SHIFT);
-
-	/*
-	 * Check if merge fn is supported.
-	 * If not we'll force DM to use PAGE_SIZE or
-	 * smaller I/O, just to be safe.
-	 */
-	if (dm_queue_merge_is_compulsory(q) && !ti->type->merge)
-		blk_limits_max_hw_sectors(limits,
-					  (unsigned int) (PAGE_SIZE >> 9));
-	return 0;
-}
-EXPORT_SYMBOL_GPL(dm_set_device_limits);
-
-/*
- * Decrement a device's use count and remove it if necessary.
- */
-void dm_put_device(struct dm_target *ti, struct dm_dev *d)
-{
-	struct dm_dev_internal *dd = container_of(d, struct dm_dev_internal,
-						  dm_dev);
-
-	if (atomic_dec_and_test(&dd->count)) {
-		close_dev(dd, ti->table->md);
-		list_del(&dd->list);
-		kfree(dd);
-	}
-}
-EXPORT_SYMBOL(dm_put_device);
-
-/*
- * Checks to see if the target joins onto the end of the table.
- */
-static int adjoin(struct dm_table *table, struct dm_target *ti)
-{
-	struct dm_target *prev;
-
-	if (!table->num_targets)
-		return !ti->begin;
-
-	prev = &table->targets[table->num_targets - 1];
-	return (ti->begin == (prev->begin + prev->len));
-}
-
-/*
- * Used to dynamically allocate the arg array.
- */
-static char **realloc_argv(unsigned *array_size, char **old_argv)
-{
-	char **argv;
-	unsigned new_size;
-
-	new_size = *array_size ? *array_size * 2 : 64;
-	argv = kmalloc(new_size * sizeof(*argv), GFP_KERNEL);
-	if (argv) {
-		memcpy(argv, old_argv, *array_size * sizeof(*argv));
-		*array_size = new_size;
-	}
-
-	kfree(old_argv);
-	return argv;
-}
-
-/*
- * Destructively splits up the argument list to pass to ctr.
- */
-int dm_split_args(int *argc, char ***argvp, char *input)
-{
-	char *start, *end = input, *out, **argv = NULL;
-	unsigned array_size = 0;
-
-	*argc = 0;
-
-	if (!input) {
-		*argvp = NULL;
-		return 0;
-	}
-
-	argv = realloc_argv(&array_size, argv);
-	if (!argv)
-		return -ENOMEM;
-
-	while (1) {
-		/* Skip whitespace */
-		start = skip_spaces(end);
-
-		if (!*start)
-			break;	/* success, we hit the end */
-
-		/* 'out' is used to remove any back-quotes */
-		end = out = start;
-		while (*end) {
-			/* Everything apart from '\0' can be quoted */
-			if (*end == '\\' && *(end + 1)) {
-				*out++ = *(end + 1);
-				end += 2;
-				continue;
-			}
-
-			if (isspace(*end))
-				break;	/* end of token */
-
-			*out++ = *end++;
-		}
-
-		/* have we already filled the array ? */
-		if ((*argc + 1) > array_size) {
-			argv = realloc_argv(&array_size, argv);
-			if (!argv)
-				return -ENOMEM;
-		}
-
-		/* we know this is whitespace */
-		if (*end)
-			end++;
-
-		/* terminate the string and put it in the array */
-		*out = '\0';
-		argv[*argc] = start;
-		(*argc)++;
-	}
-
-	*argvp = argv;
-	return 0;
-}
-
-/*
- * Impose necessary and sufficient conditions on a devices's table such
- * that any incoming bio which respects its logical_block_size can be
- * processed successfully.  If it falls across the boundary between
- * two or more targets, the size of each piece it gets split into must
- * be compatible with the logical_block_size of the target processing it.
- */
-static int validate_hardware_logical_block_alignment(struct dm_table *table,
-						 struct queue_limits *limits)
-{
-	/*
-	 * This function uses arithmetic modulo the logical_block_size
-	 * (in units of 512-byte sectors).
-	 */
-	unsigned short device_logical_block_size_sects =
-		limits->logical_block_size >> SECTOR_SHIFT;
-
-	/*
-	 * Offset of the start of the next table entry, mod logical_block_size.
-	 */
-	unsigned short next_target_start = 0;
-
-	/*
-	 * Given an aligned bio that extends beyond the end of a
-	 * target, how many sectors must the next target handle?
-	 */
-	unsigned short remaining = 0;
-
-	struct dm_target *uninitialized_var(ti);
-	struct queue_limits ti_limits;
-	unsigned i = 0;
-
-	/*
-	 * Check each entry in the table in turn.
-	 */
-	while (i < dm_table_get_num_targets(table)) {
-		ti = dm_table_get_target(table, i++);
-
-		blk_set_stacking_limits(&ti_limits);
-
-		/* combine all target devices' limits */
-		if (ti->type->iterate_devices)
-			ti->type->iterate_devices(ti, dm_set_device_limits,
-						  &ti_limits);
-
-		/*
-		 * If the remaining sectors fall entirely within this
-		 * table entry are they compatible with its logical_block_size?
-		 */
-		if (remaining < ti->len &&
-		    remaining & ((ti_limits.logical_block_size >>
-				  SECTOR_SHIFT) - 1))
-			break;	/* Error */
-
-		next_target_start =
-		    (unsigned short) ((next_target_start + ti->len) &
-				      (device_logical_block_size_sects - 1));
-		remaining = next_target_start ?
-		    device_logical_block_size_sects - next_target_start : 0;
-	}
-
-	if (remaining) {
-		DMWARN("%s: table line %u (start sect %llu len %llu) "
-		       "not aligned to h/w logical block size %u",
-		       dm_device_name(table->md), i,
-		       (unsigned long long) ti->begin,
-		       (unsigned long long) ti->len,
-		       limits->logical_block_size);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-int dm_table_add_target(struct dm_table *t, const char *type,
-			sector_t start, sector_t len, char *params)
-{
-	int r = -EINVAL, argc;
-	char **argv;
-	struct dm_target *tgt;
-
-	if (t->singleton) {
-		DMERR("%s: target type %s must appear alone in table",
-		      dm_device_name(t->md), t->targets->type->name);
-		return -EINVAL;
-	}
-
-	if ((r = check_space(t)))
-		return r;
-
-	tgt = t->targets + t->num_targets;
-	memset(tgt, 0, sizeof(*tgt));
-
-	if (!len) {
-		DMERR("%s: zero-length target", dm_device_name(t->md));
-		return -EINVAL;
-	}
-
-	tgt->type = dm_get_target_type(type);
-	if (!tgt->type) {
-		DMERR("%s: %s: unknown target type", dm_device_name(t->md),
-		      type);
-		return -EINVAL;
-	}
-
-	if (dm_target_needs_singleton(tgt->type)) {
-		if (t->num_targets) {
-			DMERR("%s: target type %s must appear alone in table",
-			      dm_device_name(t->md), type);
-			return -EINVAL;
-		}
-		t->singleton = 1;
-	}
-
-	if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) {
-		DMERR("%s: target type %s may not be included in read-only tables",
-		      dm_device_name(t->md), type);
-		return -EINVAL;
-	}
-
-	if (t->immutable_target_type) {
-		if (t->immutable_target_type != tgt->type) {
-			DMERR("%s: immutable target type %s cannot be mixed with other target types",
-			      dm_device_name(t->md), t->immutable_target_type->name);
-			return -EINVAL;
-		}
-	} else if (dm_target_is_immutable(tgt->type)) {
-		if (t->num_targets) {
-			DMERR("%s: immutable target type %s cannot be mixed with other target types",
-			      dm_device_name(t->md), tgt->type->name);
-			return -EINVAL;
-		}
-		t->immutable_target_type = tgt->type;
-	}
-
-	tgt->table = t;
-	tgt->begin = start;
-	tgt->len = len;
-	tgt->error = "Unknown error";
-
-	/*
-	 * Does this target adjoin the previous one ?
-	 */
-	if (!adjoin(t, tgt)) {
-		tgt->error = "Gap in table";
-		r = -EINVAL;
-		goto bad;
-	}
-
-	r = dm_split_args(&argc, &argv, params);
-	if (r) {
-		tgt->error = "couldn't split parameters (insufficient memory)";
-		goto bad;
-	}
-
-	r = tgt->type->ctr(tgt, argc, argv);
-	kfree(argv);
-	if (r)
-		goto bad;
-
-	t->highs[t->num_targets++] = tgt->begin + tgt->len - 1;
-
-	if (!tgt->num_discard_requests && tgt->discards_supported)
-		DMWARN("%s: %s: ignoring discards_supported because num_discard_requests is zero.",
-		       dm_device_name(t->md), type);
-
-	return 0;
-
- bad:
-	DMERR("%s: %s: %s", dm_device_name(t->md), type, tgt->error);
-	dm_put_target_type(tgt->type);
-	return r;
-}
-
-/*
- * Target argument parsing helpers.
- */
-static int validate_next_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
-			     unsigned *value, char **error, unsigned grouped)
-{
-	const char *arg_str = dm_shift_arg(arg_set);
-	char dummy;
-
-	if (!arg_str ||
-	    (sscanf(arg_str, "%u%c", value, &dummy) != 1) ||
-	    (*value < arg->min) ||
-	    (*value > arg->max) ||
-	    (grouped && arg_set->argc < *value)) {
-		*error = arg->error;
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
-		unsigned *value, char **error)
-{
-	return validate_next_arg(arg, arg_set, value, error, 0);
-}
-EXPORT_SYMBOL(dm_read_arg);
-
-int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set,
-		      unsigned *value, char **error)
-{
-	return validate_next_arg(arg, arg_set, value, error, 1);
-}
-EXPORT_SYMBOL(dm_read_arg_group);
-
-const char *dm_shift_arg(struct dm_arg_set *as)
-{
-	char *r;
-
-	if (as->argc) {
-		as->argc--;
-		r = *as->argv;
-		as->argv++;
-		return r;
-	}
-
-	return NULL;
-}
-EXPORT_SYMBOL(dm_shift_arg);
-
-void dm_consume_args(struct dm_arg_set *as, unsigned num_args)
-{
-	BUG_ON(as->argc < num_args);
-	as->argc -= num_args;
-	as->argv += num_args;
-}
-EXPORT_SYMBOL(dm_consume_args);
-
-static int dm_table_set_type(struct dm_table *t)
-{
-	unsigned i;
-	unsigned bio_based = 0, request_based = 0;
-	struct dm_target *tgt;
-	struct dm_dev_internal *dd;
-	struct list_head *devices;
-
-	for (i = 0; i < t->num_targets; i++) {
-		tgt = t->targets + i;
-		if (dm_target_request_based(tgt))
-			request_based = 1;
-		else
-			bio_based = 1;
-
-		if (bio_based && request_based) {
-			DMWARN("Inconsistent table: different target types"
-			       " can't be mixed up");
-			return -EINVAL;
-		}
-	}
-
-	if (bio_based) {
-		/* We must use this table as bio-based */
-		t->type = DM_TYPE_BIO_BASED;
-		return 0;
-	}
-
-	BUG_ON(!request_based); /* No targets in this table */
-
-	/* Non-request-stackable devices can't be used for request-based dm */
-	devices = dm_table_get_devices(t);
-	list_for_each_entry(dd, devices, list) {
-		if (!blk_queue_stackable(bdev_get_queue(dd->dm_dev.bdev))) {
-			DMWARN("table load rejected: including"
-			       " non-request-stackable devices");
-			return -EINVAL;
-		}
-	}
-
-	/*
-	 * Request-based dm supports only tables that have a single target now.
-	 * To support multiple targets, request splitting support is needed,
-	 * and that needs lots of changes in the block-layer.
-	 * (e.g. request completion process for partial completion.)
-	 */
-	if (t->num_targets > 1) {
-		DMWARN("Request-based dm doesn't support multiple targets yet");
-		return -EINVAL;
-	}
-
-	t->type = DM_TYPE_REQUEST_BASED;
-
-	return 0;
-}
-
-unsigned dm_table_get_type(struct dm_table *t)
-{
-	return t->type;
-}
-
-struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
-{
-	return t->immutable_target_type;
-}
-
-bool dm_table_request_based(struct dm_table *t)
-{
-	return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED;
-}
-
-int dm_table_alloc_md_mempools(struct dm_table *t)
-{
-	unsigned type = dm_table_get_type(t);
-
-	if (unlikely(type == DM_TYPE_NONE)) {
-		DMWARN("no table type is set, can't allocate mempools");
-		return -EINVAL;
-	}
-
-	t->mempools = dm_alloc_md_mempools(type, t->integrity_supported);
-	if (!t->mempools)
-		return -ENOMEM;
-
-	return 0;
-}
-
-void dm_table_free_md_mempools(struct dm_table *t)
-{
-	dm_free_md_mempools(t->mempools);
-	t->mempools = NULL;
-}
-
-struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t)
-{
-	return t->mempools;
-}
-
-static int setup_indexes(struct dm_table *t)
-{
-	int i;
-	unsigned int total = 0;
-	sector_t *indexes;
-
-	/* allocate the space for *all* the indexes */
-	for (i = t->depth - 2; i >= 0; i--) {
-		t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE);
-		total += t->counts[i];
-	}
-
-	indexes = (sector_t *) dm_vcalloc(total, (unsigned long) NODE_SIZE);
-	if (!indexes)
-		return -ENOMEM;
-
-	/* set up internal nodes, bottom-up */
-	for (i = t->depth - 2; i >= 0; i--) {
-		t->index[i] = indexes;
-		indexes += (KEYS_PER_NODE * t->counts[i]);
-		setup_btree_index(i, t);
-	}
-
-	return 0;
-}
-
-/*
- * Builds the btree to index the map.
- */
-static int dm_table_build_index(struct dm_table *t)
-{
-	int r = 0;
-	unsigned int leaf_nodes;
-
-	/* how many indexes will the btree have ? */
-	leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);
-	t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);
-
-	/* leaf layer has already been set up */
-	t->counts[t->depth - 1] = leaf_nodes;
-	t->index[t->depth - 1] = t->highs;
-
-	if (t->depth >= 2)
-		r = setup_indexes(t);
-
-	return r;
-}
-
-/*
- * Get a disk whose integrity profile reflects the table's profile.
- * If %match_all is true, all devices' profiles must match.
- * If %match_all is false, all devices must at least have an
- * allocated integrity profile; but uninitialized is ok.
- * Returns NULL if integrity support was inconsistent or unavailable.
- */
-static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t,
-						    bool match_all)
-{
-	struct list_head *devices = dm_table_get_devices(t);
-	struct dm_dev_internal *dd = NULL;
-	struct gendisk *prev_disk = NULL, *template_disk = NULL;
-
-	list_for_each_entry(dd, devices, list) {
-		template_disk = dd->dm_dev.bdev->bd_disk;
-		if (!blk_get_integrity(template_disk))
-			goto no_integrity;
-		if (!match_all && !blk_integrity_is_initialized(template_disk))
-			continue; /* skip uninitialized profiles */
-		else if (prev_disk &&
-			 blk_integrity_compare(prev_disk, template_disk) < 0)
-			goto no_integrity;
-		prev_disk = template_disk;
-	}
-
-	return template_disk;
-
-no_integrity:
-	if (prev_disk)
-		DMWARN("%s: integrity not set: %s and %s profile mismatch",
-		       dm_device_name(t->md),
-		       prev_disk->disk_name,
-		       template_disk->disk_name);
-	return NULL;
-}
-
-/*
- * Register the mapped device for blk_integrity support if
- * the underlying devices have an integrity profile.  But all devices
- * may not have matching profiles (checking all devices isn't reliable
- * during table load because this table may use other DM device(s) which
- * must be resumed before they will have an initialized integity profile).
- * Stacked DM devices force a 2 stage integrity profile validation:
- * 1 - during load, validate all initialized integrity profiles match
- * 2 - during resume, validate all integrity profiles match
- */
-static int dm_table_prealloc_integrity(struct dm_table *t, struct mapped_device *md)
-{
-	struct gendisk *template_disk = NULL;
-
-	template_disk = dm_table_get_integrity_disk(t, false);
-	if (!template_disk)
-		return 0;
-
-	if (!blk_integrity_is_initialized(dm_disk(md))) {
-		t->integrity_supported = 1;
-		return blk_integrity_register(dm_disk(md), NULL);
-	}
-
-	/*
-	 * If DM device already has an initalized integrity
-	 * profile the new profile should not conflict.
-	 */
-	if (blk_integrity_is_initialized(template_disk) &&
-	    blk_integrity_compare(dm_disk(md), template_disk) < 0) {
-		DMWARN("%s: conflict with existing integrity profile: "
-		       "%s profile mismatch",
-		       dm_device_name(t->md),
-		       template_disk->disk_name);
-		return 1;
-	}
-
-	/* Preserve existing initialized integrity profile */
-	t->integrity_supported = 1;
-	return 0;
-}
-
-/*
- * Prepares the table for use by building the indices,
- * setting the type, and allocating mempools.
- */
-int dm_table_complete(struct dm_table *t)
-{
-	int r;
-
-	r = dm_table_set_type(t);
-	if (r) {
-		DMERR("unable to set table type");
-		return r;
-	}
-
-	r = dm_table_build_index(t);
-	if (r) {
-		DMERR("unable to build btrees");
-		return r;
-	}
-
-	r = dm_table_prealloc_integrity(t, t->md);
-	if (r) {
-		DMERR("could not register integrity profile.");
-		return r;
-	}
-
-	r = dm_table_alloc_md_mempools(t);
-	if (r)
-		DMERR("unable to allocate mempools");
-
-	return r;
-}
-
-static DEFINE_MUTEX(_event_lock);
-void dm_table_event_callback(struct dm_table *t,
-			     void (*fn)(void *), void *context)
-{
-	mutex_lock(&_event_lock);
-	t->event_fn = fn;
-	t->event_context = context;
-	mutex_unlock(&_event_lock);
-}
-
-void dm_table_event(struct dm_table *t)
-{
-	/*
-	 * You can no longer call dm_table_event() from interrupt
-	 * context, use a bottom half instead.
-	 */
-	BUG_ON(in_interrupt());
-
-	mutex_lock(&_event_lock);
-	if (t->event_fn)
-		t->event_fn(t->event_context);
-	mutex_unlock(&_event_lock);
-}
-EXPORT_SYMBOL(dm_table_event);
-
-sector_t dm_table_get_size(struct dm_table *t)
-{
-	return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0;
-}
-EXPORT_SYMBOL(dm_table_get_size);
-
-struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index)
-{
-	if (index >= t->num_targets)
-		return NULL;
-
-	return t->targets + index;
-}
-
-/*
- * Search the btree for the correct target.
- *
- * Caller should check returned pointer with dm_target_is_valid()
- * to trap I/O beyond end of device.
- */
-struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
-{
-	unsigned int l, n = 0, k = 0;
-	sector_t *node;
-
-	for (l = 0; l < t->depth; l++) {
-		n = get_child(n, k);
-		node = get_node(t, l, n);
-
-		for (k = 0; k < KEYS_PER_NODE; k++)
-			if (node[k] >= sector)
-				break;
-	}
-
-	return &t->targets[(KEYS_PER_NODE * n) + k];
-}
-
-/*
- * Establish the new table's queue_limits and validate them.
- */
-int dm_calculate_queue_limits(struct dm_table *table,
-			      struct queue_limits *limits)
-{
-	struct dm_target *uninitialized_var(ti);
-	struct queue_limits ti_limits;
-	unsigned i = 0;
-
-	blk_set_stacking_limits(limits);
-
-	while (i < dm_table_get_num_targets(table)) {
-		blk_set_stacking_limits(&ti_limits);
-
-		ti = dm_table_get_target(table, i++);
-
-		if (!ti->type->iterate_devices)
-			goto combine_limits;
-
-		/*
-		 * Combine queue limits of all the devices this target uses.
-		 */
-		ti->type->iterate_devices(ti, dm_set_device_limits,
-					  &ti_limits);
-
-		/* Set I/O hints portion of queue limits */
-		if (ti->type->io_hints)
-			ti->type->io_hints(ti, &ti_limits);
-
-		/*
-		 * Check each device area is consistent with the target's
-		 * overall queue limits.
-		 */
-		if (ti->type->iterate_devices(ti, device_area_is_invalid,
-					      &ti_limits))
-			return -EINVAL;
-
-combine_limits:
-		/*
-		 * Merge this target's queue limits into the overall limits
-		 * for the table.
-		 */
-		if (blk_stack_limits(limits, &ti_limits, 0) < 0)
-			DMWARN("%s: adding target device "
-			       "(start sect %llu len %llu) "
-			       "caused an alignment inconsistency",
-			       dm_device_name(table->md),
-			       (unsigned long long) ti->begin,
-			       (unsigned long long) ti->len);
-	}
-
-	return validate_hardware_logical_block_alignment(table, limits);
-}
-
-/*
- * Set the integrity profile for this device if all devices used have
- * matching profiles.  We're quite deep in the resume path but still
- * don't know if all devices (particularly DM devices this device
- * may be stacked on) have matching profiles.  Even if the profiles
- * don't match we have no way to fail (to resume) at this point.
- */
-static void dm_table_set_integrity(struct dm_table *t)
-{
-	struct gendisk *template_disk = NULL;
-
-	if (!blk_get_integrity(dm_disk(t->md)))
-		return;
-
-	template_disk = dm_table_get_integrity_disk(t, true);
-	if (template_disk)
-		blk_integrity_register(dm_disk(t->md),
-				       blk_get_integrity(template_disk));
-	else if (blk_integrity_is_initialized(dm_disk(t->md)))
-		DMWARN("%s: device no longer has a valid integrity profile",
-		       dm_device_name(t->md));
-	else
-		DMWARN("%s: unable to establish an integrity profile",
-		       dm_device_name(t->md));
-}
-
-static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev,
-				sector_t start, sector_t len, void *data)
-{
-	unsigned flush = (*(unsigned *)data);
-	struct request_queue *q = bdev_get_queue(dev->bdev);
-
-	return q && (q->flush_flags & flush);
-}
-
-static bool dm_table_supports_flush(struct dm_table *t, unsigned flush)
-{
-	struct dm_target *ti;
-	unsigned i = 0;
-
-	/*
-	 * Require at least one underlying device to support flushes.
-	 * t->devices includes internal dm devices such as mirror logs
-	 * so we need to use iterate_devices here, which targets
-	 * supporting flushes must provide.
-	 */
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
-
-		if (!ti->num_flush_requests)
-			continue;
-
-		if (ti->type->iterate_devices &&
-		    ti->type->iterate_devices(ti, device_flush_capable, &flush))
-			return 1;
-	}
-
-	return 0;
-}
-
-static bool dm_table_discard_zeroes_data(struct dm_table *t)
-{
-	struct dm_target *ti;
-	unsigned i = 0;
-
-	/* Ensure that all targets supports discard_zeroes_data. */
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
-
-		if (ti->discard_zeroes_data_unsupported)
-			return 0;
-	}
-
-	return 1;
-}
-
-static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev,
-			    sector_t start, sector_t len, void *data)
-{
-	struct request_queue *q = bdev_get_queue(dev->bdev);
-
-	return q && blk_queue_nonrot(q);
-}
-
-static bool dm_table_is_nonrot(struct dm_table *t)
-{
-	struct dm_target *ti;
-	unsigned i = 0;
-
-	/* Ensure that all underlying device are non-rotational. */
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
-
-		if (!ti->type->iterate_devices ||
-		    !ti->type->iterate_devices(ti, device_is_nonrot, NULL))
-			return 0;
-	}
-
-	return 1;
-}
-
-void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
-			       struct queue_limits *limits)
-{
-	unsigned flush = 0;
-
-	/*
-	 * Copy table's limits to the DM device's request_queue
-	 */
-	q->limits = *limits;
-
-	if (!dm_table_supports_discards(t))
-		queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
-	else
-		queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
-
-	if (dm_table_supports_flush(t, REQ_FLUSH)) {
-		flush |= REQ_FLUSH;
-		if (dm_table_supports_flush(t, REQ_FUA))
-			flush |= REQ_FUA;
-	}
-	blk_queue_flush(q, flush);
-
-	if (!dm_table_discard_zeroes_data(t))
-		q->limits.discard_zeroes_data = 0;
-
-	if (dm_table_is_nonrot(t))
-		queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
-	else
-		queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
-
-	dm_table_set_integrity(t);
-
-	/*
-	 * QUEUE_FLAG_STACKABLE must be set after all queue settings are
-	 * visible to other CPUs because, once the flag is set, incoming bios
-	 * are processed by request-based dm, which refers to the queue
-	 * settings.
-	 * Until the flag set, bios are passed to bio-based dm and queued to
-	 * md->deferred where queue settings are not needed yet.
-	 * Those bios are passed to request-based dm at the resume time.
-	 */
-	smp_mb();
-	if (dm_table_request_based(t))
-		queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q);
-}
-
-unsigned int dm_table_get_num_targets(struct dm_table *t)
-{
-	return t->num_targets;
-}
-
-struct list_head *dm_table_get_devices(struct dm_table *t)
-{
-	return &t->devices;
-}
-
-fmode_t dm_table_get_mode(struct dm_table *t)
-{
-	return t->mode;
-}
-EXPORT_SYMBOL(dm_table_get_mode);
-
-static void suspend_targets(struct dm_table *t, unsigned postsuspend)
-{
-	int i = t->num_targets;
-	struct dm_target *ti = t->targets;
-
-	while (i--) {
-		if (postsuspend) {
-			if (ti->type->postsuspend)
-				ti->type->postsuspend(ti);
-		} else if (ti->type->presuspend)
-			ti->type->presuspend(ti);
-
-		ti++;
-	}
-}
-
-void dm_table_presuspend_targets(struct dm_table *t)
-{
-	if (!t)
-		return;
-
-	suspend_targets(t, 0);
-}
-
-void dm_table_postsuspend_targets(struct dm_table *t)
-{
-	if (!t)
-		return;
-
-	suspend_targets(t, 1);
-}
-
-int dm_table_resume_targets(struct dm_table *t)
-{
-	int i, r = 0;
-
-	for (i = 0; i < t->num_targets; i++) {
-		struct dm_target *ti = t->targets + i;
-
-		if (!ti->type->preresume)
-			continue;
-
-		r = ti->type->preresume(ti);
-		if (r)
-			return r;
-	}
-
-	for (i = 0; i < t->num_targets; i++) {
-		struct dm_target *ti = t->targets + i;
-
-		if (ti->type->resume)
-			ti->type->resume(ti);
-	}
-
-	return 0;
-}
-
-void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb)
-{
-	list_add(&cb->list, &t->target_callbacks);
-}
-EXPORT_SYMBOL_GPL(dm_table_add_target_callbacks);
-
-int dm_table_any_congested(struct dm_table *t, int bdi_bits)
-{
-	struct dm_dev_internal *dd;
-	struct list_head *devices = dm_table_get_devices(t);
-	struct dm_target_callbacks *cb;
-	int r = 0;
-
-	list_for_each_entry(dd, devices, list) {
-		struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev);
-		char b[BDEVNAME_SIZE];
-
-		if (likely(q))
-			r |= bdi_congested(&q->backing_dev_info, bdi_bits);
-		else
-			DMWARN_LIMIT("%s: any_congested: nonexistent device %s",
-				     dm_device_name(t->md),
-				     bdevname(dd->dm_dev.bdev, b));
-	}
-
-	list_for_each_entry(cb, &t->target_callbacks, list)
-		if (cb->congested_fn)
-			r |= cb->congested_fn(cb, bdi_bits);
-
-	return r;
-}
-
-int dm_table_any_busy_target(struct dm_table *t)
-{
-	unsigned i;
-	struct dm_target *ti;
-
-	for (i = 0; i < t->num_targets; i++) {
-		ti = t->targets + i;
-		if (ti->type->busy && ti->type->busy(ti))
-			return 1;
-	}
-
-	return 0;
-}
-
-struct mapped_device *dm_table_get_md(struct dm_table *t)
-{
-	return t->md;
-}
-EXPORT_SYMBOL(dm_table_get_md);
-
-static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev,
-				  sector_t start, sector_t len, void *data)
-{
-	struct request_queue *q = bdev_get_queue(dev->bdev);
-
-	return q && blk_queue_discard(q);
-}
-
-bool dm_table_supports_discards(struct dm_table *t)
-{
-	struct dm_target *ti;
-	unsigned i = 0;
-
-	/*
-	 * Unless any target used by the table set discards_supported,
-	 * require at least one underlying device to support discards.
-	 * t->devices includes internal dm devices such as mirror logs
-	 * so we need to use iterate_devices here, which targets
-	 * supporting discard selectively must provide.
-	 */
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
-
-		if (!ti->num_discard_requests)
-			continue;
-
-		if (ti->discards_supported)
-			return 1;
-
-		if (ti->type->iterate_devices &&
-		    ti->type->iterate_devices(ti, device_discard_capable, NULL))
-			return 1;
-	}
-
-	return 0;
-}