#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
- * @rq: request with integrity metadata attached
+ * @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 request.
+ * scatterlist corresponding to the integrity metadata in a bio.
*/
-int blk_rq_count_integrity_sg(struct request *rq)
+int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
{
- struct bio_vec *iv, *ivprv;
- struct req_iterator iter;
- unsigned int segments;
+ 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) {
- ivprv = NULL;
- segments = 0;
+ if (ivprv) {
+ if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
+ goto new_segment;
- rq_for_each_integrity_segment(iv, rq, iter) {
+ if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
+ goto new_segment;
- if (!ivprv || !BIOVEC_PHYS_MERGEABLE(ivprv, iv))
+ 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;
}
/**
* blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
- * @rq: request with integrity metadata attached
+ * @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 *rq, struct scatterlist *sglist)
+int blk_rq_map_integrity_sg(struct request_queue *q, struct bio *bio,
+ struct scatterlist *sglist)
{
- struct bio_vec *iv, *ivprv;
- struct req_iterator iter;
- struct scatterlist *sg;
- unsigned int segments;
+ struct bio_vec *iv, *ivprv = NULL;
+ struct scatterlist *sg = NULL;
+ unsigned int segments = 0;
+ unsigned int i = 0;
- ivprv = NULL;
- sg = NULL;
- segments = 0;
-
- rq_for_each_integrity_segment(iv, rq, iter) {
+ 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:
EXPORT_SYMBOL(blk_rq_map_integrity_sg);
/**
- * blk_integrity_compare - Compare integrity profile of two block devices
- * @bd1: Device to compare
- * @bd2: Device to compare
+ * 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 block devices have
+ * function can be used to check whether two gendisk devices have
* compatible integrity formats.
*/
-int blk_integrity_compare(struct block_device *bd1, struct block_device *bd2)
+int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
{
- struct blk_integrity *b1 = bd1->bd_disk->integrity;
- struct blk_integrity *b2 = bd2->bd_disk->integrity;
+ struct blk_integrity *b1 = gd1->integrity;
+ struct blk_integrity *b2 = gd2->integrity;
- BUG_ON(bd1->bd_disk == NULL);
- BUG_ON(bd2->bd_disk == NULL);
+ if (!b1 && !b2)
+ return 0;
if (!b1 || !b2)
- return 0;
+ return -1;
if (b1->sector_size != b2->sector_size) {
printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ 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__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ 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__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ 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__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ gd1->disk_name, gd2->disk_name,
b1->name, b2->name);
return -1;
}
}
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 *);
NULL,
};
-static struct sysfs_ops integrity_ops = {
+static const struct sysfs_ops integrity_ops = {
.show = &integrity_attr_show,
.store = &integrity_attr_store,
};
.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: integrity profile
+ * @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. See Documentation/block/data-integrity.txt.
+ * 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);
- BUG_ON(template == NULL);
if (disk->integrity == NULL) {
bi = kmem_cache_alloc(integrity_cachep,
- GFP_KERNEL | __GFP_ZERO);
+ GFP_KERNEL | __GFP_ZERO);
if (!bi)
return -1;
if (kobject_init_and_add(&bi->kobj, &integrity_ktype,
- &disk->dev.kobj, "%s", "integrity")) {
+ &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 = disk->queue->hardsect_size;
+ bi->sector_size = queue_logical_block_size(disk->queue);
disk->integrity = bi;
} else
bi = disk->integrity;
/* Use the provided profile as template */
- 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;
+ 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;
}
kobject_uevent(&bi->kobj, KOBJ_REMOVE);
kobject_del(&bi->kobj);
- kobject_put(&disk->dev.kobj);
- kmem_cache_free(integrity_cachep, bi);
+ kobject_put(&bi->kobj);
+ disk->integrity = NULL;
}
EXPORT_SYMBOL(blk_integrity_unregister);
Code Review / linux-2.6.git / blobdiff