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-rw-r--r--block/blk-integrity.c160
1 files changed, 58 insertions, 102 deletions
diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index 7a96f57ed195..4615a3386798 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -30,10 +30,6 @@
#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
@@ -146,13 +142,13 @@ EXPORT_SYMBOL(blk_rq_map_integrity_sg);
*/
int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
{
- struct blk_integrity *b1 = gd1->integrity;
- struct blk_integrity *b2 = gd2->integrity;
+ struct blk_integrity *b1 = &gd1->integrity;
+ struct blk_integrity *b2 = &gd2->integrity;
- if (!b1 && !b2)
+ if (!b1->profile && !b2->profile)
return 0;
- if (!b1 || !b2)
+ if (!b1->profile || !b2->profile)
return -1;
if (b1->interval_exp != b2->interval_exp) {
@@ -163,21 +159,21 @@ int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
}
if (b1->tuple_size != b2->tuple_size) {
- printk(KERN_ERR "%s: %s/%s tuple sz %u != %u\n", __func__,
+ pr_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__,
+ pr_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 (b1->profile != b2->profile) {
- printk(KERN_ERR "%s: %s/%s type %s != %s\n", __func__,
+ pr_err("%s: %s/%s type %s != %s\n", __func__,
gd1->disk_name, gd2->disk_name,
b1->profile->name, b2->profile->name);
return -1;
@@ -250,7 +246,7 @@ static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr,
char *page)
{
struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);
- struct blk_integrity *bi = blk_get_integrity(disk);
+ struct blk_integrity *bi = &disk->integrity;
struct integrity_sysfs_entry *entry =
container_of(attr, struct integrity_sysfs_entry, attr);
@@ -262,7 +258,7 @@ static ssize_t integrity_attr_store(struct kobject *kobj,
size_t count)
{
struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);
- struct blk_integrity *bi = blk_get_integrity(disk);
+ struct blk_integrity *bi = &disk->integrity;
struct integrity_sysfs_entry *entry =
container_of(attr, struct integrity_sysfs_entry, attr);
ssize_t ret = 0;
@@ -275,7 +271,7 @@ static ssize_t integrity_attr_store(struct kobject *kobj,
static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
{
- if (bi != NULL && bi->profile->name != NULL)
+ if (bi->profile && bi->profile->name)
return sprintf(page, "%s\n", bi->profile->name);
else
return sprintf(page, "none\n");
@@ -283,18 +279,13 @@ static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
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");
+ return sprintf(page, "%u\n", bi->tag_size);
}
static ssize_t integrity_interval_show(struct blk_integrity *bi, char *page)
{
- if (bi != NULL)
- return sprintf(page, "%u\n", 1 << bi->interval_exp);
- else
- return sprintf(page, "0\n");
+ return sprintf(page, "%u\n",
+ bi->interval_exp ? 1 << bi->interval_exp : 0);
}
static ssize_t integrity_verify_store(struct blk_integrity *bi,
@@ -388,113 +379,78 @@ static const struct sysfs_ops integrity_ops = {
.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 gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);
- struct blk_integrity *bi = blk_get_integrity(disk);
-
- 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->profile->name && strcmp(bi->profile->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
+ * @template: block 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.
+ * 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.
*/
-int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
+void blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
{
- struct blk_integrity *bi;
-
- BUG_ON(disk == NULL);
+ struct blk_integrity *bi = &disk->integrity;
- if (disk->integrity == NULL) {
- bi = kmem_cache_alloc(integrity_cachep,
- GFP_KERNEL | __GFP_ZERO);
- if (!bi)
- return -1;
+ bi->flags = BLK_INTEGRITY_VERIFY | BLK_INTEGRITY_GENERATE |
+ template->flags;
+ bi->interval_exp = ilog2(queue_logical_block_size(disk->queue));
+ bi->profile = template->profile;
+ bi->tuple_size = template->tuple_size;
+ bi->tag_size = template->tag_size;
- if (kobject_init_and_add(&disk->integrity_kobj, &integrity_ktype,
- &disk_to_dev(disk)->kobj,
- "%s", "integrity")) {
- kmem_cache_free(integrity_cachep, bi);
- return -1;
- }
-
- kobject_uevent(&disk->integrity_kobj, KOBJ_ADD);
-
- bi->flags |= BLK_INTEGRITY_VERIFY | BLK_INTEGRITY_GENERATE;
- bi->interval_exp = ilog2(queue_logical_block_size(disk->queue));
- disk->integrity = bi;
- } else
- bi = disk->integrity;
-
- /* Use the provided profile as template */
- if (template != NULL) {
- bi->profile = template->profile;
- bi->tuple_size = template->tuple_size;
- bi->tag_size = template->tag_size;
- bi->flags |= template->flags;
- } else
- bi->profile->name = bi_unsupported_name;
-
- disk->queue->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES;
-
- return 0;
+ blk_integrity_revalidate(disk);
}
EXPORT_SYMBOL(blk_integrity_register);
/**
- * blk_integrity_unregister - Remove block integrity profile
- * @disk: disk whose integrity profile to deallocate
+ * blk_integrity_unregister - Unregister block integrity profile
+ * @disk: disk whose integrity profile to unregister
*
- * Description: This function frees all memory used by the block
- * integrity profile. To be called at device teardown.
+ * Description: This function unregisters the integrity capability from
+ * a block device.
*/
void blk_integrity_unregister(struct gendisk *disk)
{
- struct blk_integrity *bi;
+ blk_integrity_revalidate(disk);
+ memset(&disk->integrity, 0, sizeof(struct blk_integrity));
+}
+EXPORT_SYMBOL(blk_integrity_unregister);
- if (!disk || !disk->integrity)
+void blk_integrity_revalidate(struct gendisk *disk)
+{
+ struct blk_integrity *bi = &disk->integrity;
+
+ if (!(disk->flags & GENHD_FL_UP))
return;
- disk->queue->backing_dev_info.capabilities &= ~BDI_CAP_STABLE_WRITES;
+ if (bi->profile)
+ disk->queue->backing_dev_info.capabilities |=
+ BDI_CAP_STABLE_WRITES;
+ else
+ disk->queue->backing_dev_info.capabilities &=
+ ~BDI_CAP_STABLE_WRITES;
+}
- bi = disk->integrity;
+void blk_integrity_add(struct gendisk *disk)
+{
+ if (kobject_init_and_add(&disk->integrity_kobj, &integrity_ktype,
+ &disk_to_dev(disk)->kobj, "%s", "integrity"))
+ return;
+ kobject_uevent(&disk->integrity_kobj, KOBJ_ADD);
+}
+
+void blk_integrity_del(struct gendisk *disk)
+{
kobject_uevent(&disk->integrity_kobj, KOBJ_REMOVE);
kobject_del(&disk->integrity_kobj);
kobject_put(&disk->integrity_kobj);
- disk->integrity = NULL;
}
-EXPORT_SYMBOL(blk_integrity_unregister);