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, 448 insertions, 0 deletions

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
new file mode 100644
index 00000000..da2a818c
--- /dev/null
+++ b/block/blk-integrity.c
@@ -0,0 +1,448 @@
+/*
+ * blk-integrity.c - Block layer data integrity extensions
+ *
+ * Copyright (C) 2007, 2008 Oracle Corporation
+ * Written by: Martin K. Petersen <martin.petersen@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ *
+ */
+
+#include <linux/blkdev.h>
+#include <linux/mempool.h>
+#include <linux/bio.h>
+#include <linux/scatterlist.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+
+#include "blk.h"
+
+static struct kmem_cache *integrity_cachep;
+
+static const char *bi_unsupported_name = "unsupported";
+
+/**
+ * blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
+ * @q:		request queue
+ * @bio:	bio with integrity metadata attached
+ *
+ * Description: Returns the number of elements required in a
+ * scatterlist corresponding to the integrity metadata in a bio.
+ */
+int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
+{
+	struct bio_vec *iv, *ivprv = NULL;
+	unsigned int segments = 0;
+	unsigned int seg_size = 0;
+	unsigned int i = 0;
+
+	bio_for_each_integrity_vec(iv, bio, i) {
+
+		if (ivprv) {
+			if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
+				goto new_segment;
+
+			if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
+				goto new_segment;
+
+			if (seg_size + iv->bv_len > queue_max_segment_size(q))
+				goto new_segment;
+
+			seg_size += iv->bv_len;
+		} else {
+new_segment:
+			segments++;
+			seg_size = iv->bv_len;
+		}
+
+		ivprv = iv;
+	}
+
+	return segments;
+}
+EXPORT_SYMBOL(blk_rq_count_integrity_sg);
+
+/**
+ * blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
+ * @q:		request queue
+ * @bio:	bio with integrity metadata attached
+ * @sglist:	target scatterlist
+ *
+ * Description: Map the integrity vectors in request into a
+ * scatterlist.  The scatterlist must be big enough to hold all
+ * elements.  I.e. sized using blk_rq_count_integrity_sg().
+ */
+int blk_rq_map_integrity_sg(struct request_queue *q, struct bio *bio,
+			    struct scatterlist *sglist)
+{
+	struct bio_vec *iv, *ivprv = NULL;
+	struct scatterlist *sg = NULL;
+	unsigned int segments = 0;
+	unsigned int i = 0;
+
+	bio_for_each_integrity_vec(iv, bio, i) {
+
+		if (ivprv) {
+			if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
+				goto new_segment;
+
+			if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
+				goto new_segment;
+
+			if (sg->length + iv->bv_len > queue_max_segment_size(q))
+				goto new_segment;
+
+			sg->length += iv->bv_len;
+		} else {
+new_segment:
+			if (!sg)
+				sg = sglist;
+			else {
+				sg->page_link &= ~0x02;
+				sg = sg_next(sg);
+			}
+
+			sg_set_page(sg, iv->bv_page, iv->bv_len, iv->bv_offset);
+			segments++;
+		}
+
+		ivprv = iv;
+	}
+
+	if (sg)
+		sg_mark_end(sg);
+
+	return segments;
+}
+EXPORT_SYMBOL(blk_rq_map_integrity_sg);
+
+/**
+ * blk_integrity_compare - Compare integrity profile of two disks
+ * @gd1:	Disk to compare
+ * @gd2:	Disk to compare
+ *
+ * Description: Meta-devices like DM and MD need to verify that all
+ * sub-devices use the same integrity format before advertising to
+ * upper layers that they can send/receive integrity metadata.  This
+ * function can be used to check whether two gendisk devices have
+ * compatible integrity formats.
+ */
+int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
+{
+	struct blk_integrity *b1 = gd1->integrity;
+	struct blk_integrity *b2 = gd2->integrity;
+
+	if (!b1 && !b2)
+		return 0;
+
+	if (!b1 || !b2)
+		return -1;
+
+	if (b1->sector_size != b2->sector_size) {
+		printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__,
+		       gd1->disk_name, gd2->disk_name,
+		       b1->sector_size, b2->sector_size);
+		return -1;
+	}
+
+	if (b1->tuple_size != b2->tuple_size) {
+		printk(KERN_ERR "%s: %s/%s tuple sz %u != %u\n", __func__,
+		       gd1->disk_name, gd2->disk_name,
+		       b1->tuple_size, b2->tuple_size);
+		return -1;
+	}
+
+	if (b1->tag_size && b2->tag_size && (b1->tag_size != b2->tag_size)) {
+		printk(KERN_ERR "%s: %s/%s tag sz %u != %u\n", __func__,
+		       gd1->disk_name, gd2->disk_name,
+		       b1->tag_size, b2->tag_size);
+		return -1;
+	}
+
+	if (strcmp(b1->name, b2->name)) {
+		printk(KERN_ERR "%s: %s/%s type %s != %s\n", __func__,
+		       gd1->disk_name, gd2->disk_name,
+		       b1->name, b2->name);
+		return -1;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(blk_integrity_compare);
+
+int blk_integrity_merge_rq(struct request_queue *q, struct request *req,
+			   struct request *next)
+{
+	if (blk_integrity_rq(req) != blk_integrity_rq(next))
+		return -1;
+
+	if (req->nr_integrity_segments + next->nr_integrity_segments >
+	    q->limits.max_integrity_segments)
+		return -1;
+
+	return 0;
+}
+EXPORT_SYMBOL(blk_integrity_merge_rq);
+
+int blk_integrity_merge_bio(struct request_queue *q, struct request *req,
+			    struct bio *bio)
+{
+	int nr_integrity_segs;
+	struct bio *next = bio->bi_next;
+
+	bio->bi_next = NULL;
+	nr_integrity_segs = blk_rq_count_integrity_sg(q, bio);
+	bio->bi_next = next;
+
+	if (req->nr_integrity_segments + nr_integrity_segs >
+	    q->limits.max_integrity_segments)
+		return -1;
+
+	req->nr_integrity_segments += nr_integrity_segs;
+
+	return 0;
+}
+EXPORT_SYMBOL(blk_integrity_merge_bio);
+
+struct integrity_sysfs_entry {
+	struct attribute attr;
+	ssize_t (*show)(struct blk_integrity *, char *);
+	ssize_t (*store)(struct blk_integrity *, const char *, size_t);
+};
+
+static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr,
+				   char *page)
+{
+	struct blk_integrity *bi =
+		container_of(kobj, struct blk_integrity, kobj);
+	struct integrity_sysfs_entry *entry =
+		container_of(attr, struct integrity_sysfs_entry, attr);
+
+	return entry->show(bi, page);
+}
+
+static ssize_t integrity_attr_store(struct kobject *kobj,
+				    struct attribute *attr, const char *page,
+				    size_t count)
+{
+	struct blk_integrity *bi =
+		container_of(kobj, struct blk_integrity, kobj);
+	struct integrity_sysfs_entry *entry =
+		container_of(attr, struct integrity_sysfs_entry, attr);
+	ssize_t ret = 0;
+
+	if (entry->store)
+		ret = entry->store(bi, page, count);
+
+	return ret;
+}
+
+static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
+{
+	if (bi != NULL && bi->name != NULL)
+		return sprintf(page, "%s\n", bi->name);
+	else
+		return sprintf(page, "none\n");
+}
+
+static ssize_t integrity_tag_size_show(struct blk_integrity *bi, char *page)
+{
+	if (bi != NULL)
+		return sprintf(page, "%u\n", bi->tag_size);
+	else
+		return sprintf(page, "0\n");
+}
+
+static ssize_t integrity_read_store(struct blk_integrity *bi,
+				    const char *page, size_t count)
+{
+	char *p = (char *) page;
+	unsigned long val = simple_strtoul(p, &p, 10);
+
+	if (val)
+		bi->flags |= INTEGRITY_FLAG_READ;
+	else
+		bi->flags &= ~INTEGRITY_FLAG_READ;
+
+	return count;
+}
+
+static ssize_t integrity_read_show(struct blk_integrity *bi, char *page)
+{
+	return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_READ) != 0);
+}
+
+static ssize_t integrity_write_store(struct blk_integrity *bi,
+				     const char *page, size_t count)
+{
+	char *p = (char *) page;
+	unsigned long val = simple_strtoul(p, &p, 10);
+
+	if (val)
+		bi->flags |= INTEGRITY_FLAG_WRITE;
+	else
+		bi->flags &= ~INTEGRITY_FLAG_WRITE;
+
+	return count;
+}
+
+static ssize_t integrity_write_show(struct blk_integrity *bi, char *page)
+{
+	return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_WRITE) != 0);
+}
+
+static struct integrity_sysfs_entry integrity_format_entry = {
+	.attr = { .name = "format", .mode = S_IRUGO },
+	.show = integrity_format_show,
+};
+
+static struct integrity_sysfs_entry integrity_tag_size_entry = {
+	.attr = { .name = "tag_size", .mode = S_IRUGO },
+	.show = integrity_tag_size_show,
+};
+
+static struct integrity_sysfs_entry integrity_read_entry = {
+	.attr = { .name = "read_verify", .mode = S_IRUGO | S_IWUSR },
+	.show = integrity_read_show,
+	.store = integrity_read_store,
+};
+
+static struct integrity_sysfs_entry integrity_write_entry = {
+	.attr = { .name = "write_generate", .mode = S_IRUGO | S_IWUSR },
+	.show = integrity_write_show,
+	.store = integrity_write_store,
+};
+
+static struct attribute *integrity_attrs[] = {
+	&integrity_format_entry.attr,
+	&integrity_tag_size_entry.attr,
+	&integrity_read_entry.attr,
+	&integrity_write_entry.attr,
+	NULL,
+};
+
+static const struct sysfs_ops integrity_ops = {
+	.show	= &integrity_attr_show,
+	.store	= &integrity_attr_store,
+};
+
+static int __init blk_dev_integrity_init(void)
+{
+	integrity_cachep = kmem_cache_create("blkdev_integrity",
+					     sizeof(struct blk_integrity),
+					     0, SLAB_PANIC, NULL);
+	return 0;
+}
+subsys_initcall(blk_dev_integrity_init);
+
+static void blk_integrity_release(struct kobject *kobj)
+{
+	struct blk_integrity *bi =
+		container_of(kobj, struct blk_integrity, kobj);
+
+	kmem_cache_free(integrity_cachep, bi);
+}
+
+static struct kobj_type integrity_ktype = {
+	.default_attrs	= integrity_attrs,
+	.sysfs_ops	= &integrity_ops,
+	.release	= blk_integrity_release,
+};
+
+bool blk_integrity_is_initialized(struct gendisk *disk)
+{
+	struct blk_integrity *bi = blk_get_integrity(disk);
+
+	return (bi && bi->name && strcmp(bi->name, bi_unsupported_name) != 0);
+}
+EXPORT_SYMBOL(blk_integrity_is_initialized);
+
+/**
+ * blk_integrity_register - Register a gendisk as being integrity-capable
+ * @disk:	struct gendisk pointer to make integrity-aware
+ * @template:	optional integrity profile to register
+ *
+ * Description: When a device needs to advertise itself as being able
+ * to send/receive integrity metadata it must use this function to
+ * register the capability with the block layer.  The template is a
+ * blk_integrity struct with values appropriate for the underlying
+ * hardware.  If template is NULL the new profile is allocated but
+ * not filled out. See Documentation/block/data-integrity.txt.
+ */
+int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
+{
+	struct blk_integrity *bi;
+
+	BUG_ON(disk == NULL);
+
+	if (disk->integrity == NULL) {
+		bi = kmem_cache_alloc(integrity_cachep,
+				      GFP_KERNEL | __GFP_ZERO);
+		if (!bi)
+			return -1;
+
+		if (kobject_init_and_add(&bi->kobj, &integrity_ktype,
+					 &disk_to_dev(disk)->kobj,
+					 "%s", "integrity")) {
+			kmem_cache_free(integrity_cachep, bi);
+			return -1;
+		}
+
+		kobject_uevent(&bi->kobj, KOBJ_ADD);
+
+		bi->flags |= INTEGRITY_FLAG_READ | INTEGRITY_FLAG_WRITE;
+		bi->sector_size = queue_logical_block_size(disk->queue);
+		disk->integrity = bi;
+	} else
+		bi = disk->integrity;
+
+	/* Use the provided profile as template */
+	if (template != NULL) {
+		bi->name = template->name;
+		bi->generate_fn = template->generate_fn;
+		bi->verify_fn = template->verify_fn;
+		bi->tuple_size = template->tuple_size;
+		bi->set_tag_fn = template->set_tag_fn;
+		bi->get_tag_fn = template->get_tag_fn;
+		bi->tag_size = template->tag_size;
+	} else
+		bi->name = bi_unsupported_name;
+
+	return 0;
+}
+EXPORT_SYMBOL(blk_integrity_register);
+
+/**
+ * blk_integrity_unregister - Remove block integrity profile
+ * @disk:	disk whose integrity profile to deallocate
+ *
+ * Description: This function frees all memory used by the block
+ * integrity profile.  To be called at device teardown.
+ */
+void blk_integrity_unregister(struct gendisk *disk)
+{
+	struct blk_integrity *bi;
+
+	if (!disk || !disk->integrity)
+		return;
+
+	bi = disk->integrity;
+
+	kobject_uevent(&bi->kobj, KOBJ_REMOVE);
+	kobject_del(&bi->kobj);
+	kobject_put(&bi->kobj);
+	disk->integrity = NULL;
+}
+EXPORT_SYMBOL(blk_integrity_unregister);