[PATCH 08/13] libnvdimm, blk: move i/o infrastructure to nd_namespace_blk

Dan Williams
2016-03-24T01:26:45Z

Consolidate the information for issuing i/o to a blk-namespace, and
eliminate some pointer chasing.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/blk.c | 137 +++++++++++++++++++++++++-------------------------
include/linux/nd.h | 2 +
2 files changed, 71 insertions(+), 68 deletions(-)

diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index c8635b3d88a8..4c14ecdc792b 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -21,17 +21,19 @@
#include <linux/sizes.h>
#include "nd.h"

-struct nd_blk_device {
- struct nd_namespace_blk *nsblk;
- struct nd_blk_region *ndbr;
- size_t disk_size;
- u32 sector_size;
- u32 internal_lbasize;
-};
+static u32 nsblk_meta_size(struct nd_namespace_blk *nsblk)
+{
+ return nsblk->lbasize - ((nsblk->lbasize >= 4096) ? 4096 : 512);
+}

-static u32 nd_blk_meta_size(struct nd_blk_device *blk_dev)
+static u32 nsblk_internal_lbasize(struct nd_namespace_blk *nsblk)
{
- return blk_dev->nsblk->lbasize - blk_dev->sector_size;
+ return roundup(nsblk->lbasize, INT_LBASIZE_ALIGNMENT);
+}
+
+static u32 nsblk_sector_size(struct nd_namespace_blk *nsblk)
+{
+ return nsblk->lbasize - nsblk_meta_size(nsblk);
}

static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk,
@@ -55,20 +57,29 @@ static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk,
return SIZE_MAX;
}

+static struct nd_blk_region *to_ndbr(struct nd_namespace_blk *nsblk)
+{
+ struct nd_region *nd_region;
+ struct device *parent;
+
+ parent = nsblk->common.dev.parent;
+ nd_region = container_of(parent, struct nd_region, dev);
+ return container_of(nd_region, struct nd_blk_region, nd_region);
+}
+
#ifdef CONFIG_BLK_DEV_INTEGRITY
-static int nd_blk_rw_integrity(struct nd_blk_device *blk_dev,
- struct bio_integrity_payload *bip, u64 lba,
- int rw)
+static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk,
+ struct bio_integrity_payload *bip, u64 lba, int rw)
{
- unsigned int len = nd_blk_meta_size(blk_dev);
+ struct nd_blk_region *ndbr = to_ndbr(nsblk);
+ unsigned int len = nsblk_meta_size(nsblk);
resource_size_t dev_offset, ns_offset;
- struct nd_namespace_blk *nsblk;
- struct nd_blk_region *ndbr;
+ u32 internal_lbasize, sector_size;
int err = 0;

- nsblk = blk_dev->nsblk;
- ndbr = blk_dev->ndbr;
- ns_offset = lba * blk_dev->internal_lbasize + blk_dev->sector_size;
+ internal_lbasize = nsblk_internal_lbasize(nsblk);
+ sector_size = nsblk_sector_size(nsblk);
+ ns_offset = lba * internal_lbasize + sector_size;
dev_offset = to_dev_offset(nsblk, ns_offset, len);
if (dev_offset == SIZE_MAX)
return -EIO;
@@ -102,25 +113,26 @@ static int nd_blk_rw_integrity(struct nd_blk_device *blk_dev,
}

#else /* CONFIG_BLK_DEV_INTEGRITY */
-static int nd_blk_rw_integrity(struct nd_blk_device *blk_dev,
- struct bio_integrity_payload *bip, u64 lba,
- int rw)
+static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk,
+ struct bio_integrity_payload *bip, u64 lba, int rw)
{
return 0;
}
#endif

-static int nd_blk_do_bvec(struct nd_blk_device *blk_dev,
- struct bio_integrity_payload *bip, struct page *page,
- unsigned int len, unsigned int off, int rw,
- sector_t sector)
+static int nsblk_do_bvec(struct nd_namespace_blk *nsblk,
+ struct bio_integrity_payload *bip, struct page *page,
+ unsigned int len, unsigned int off, int rw, sector_t sector)
{
- struct nd_blk_region *ndbr = blk_dev->ndbr;
+ struct nd_blk_region *ndbr = to_ndbr(nsblk);
resource_size_t dev_offset, ns_offset;
+ u32 internal_lbasize, sector_size;
int err = 0;
void *iobuf;
u64 lba;

+ internal_lbasize = nsblk_internal_lbasize(nsblk);
+ sector_size = nsblk_sector_size(nsblk);
while (len) {
unsigned int cur_len;

@@ -130,11 +142,11 @@ static int nd_blk_do_bvec(struct nd_blk_device *blk_dev,
* Block Window setup/move steps. the do_io routine is capable
* of handling len <= PAGE_SIZE.
*/
- cur_len = bip ? min(len, blk_dev->sector_size) : len;
+ cur_len = bip ? min(len, sector_size) : len;

- lba = div_u64(sector << SECTOR_SHIFT, blk_dev->sector_size);
- ns_offset = lba * blk_dev->internal_lbasize;
- dev_offset = to_dev_offset(blk_dev->nsblk, ns_offset, cur_len);
+ lba = div_u64(sector << SECTOR_SHIFT, sector_size);
+ ns_offset = lba * internal_lbasize;
+ dev_offset = to_dev_offset(nsblk, ns_offset, cur_len);
if (dev_offset == SIZE_MAX)
return -EIO;

@@ -145,13 +157,13 @@ static int nd_blk_do_bvec(struct nd_blk_device *blk_dev,
return err;

if (bip) {
- err = nd_blk_rw_integrity(blk_dev, bip, lba, rw);
+ err = nd_blk_rw_integrity(nsblk, bip, lba, rw);
if (err)
return err;
}
len -= cur_len;
off += cur_len;
- sector += blk_dev->sector_size >> SECTOR_SHIFT;
+ sector += sector_size >> SECTOR_SHIFT;
}

return err;
@@ -160,7 +172,7 @@ static int nd_blk_do_bvec(struct nd_blk_device *blk_dev,
static blk_qc_t nd_blk_make_request(struct request_queue *q, struct bio *bio)
{
struct bio_integrity_payload *bip;
- struct nd_blk_device *blk_dev;
+ struct nd_namespace_blk *nsblk;
struct bvec_iter iter;
unsigned long start;
struct bio_vec bvec;
@@ -179,17 +191,17 @@ static blk_qc_t nd_blk_make_request(struct request_queue *q, struct bio *bio)
}

bip = bio_integrity(bio);
- blk_dev = q->queuedata;
+ nsblk = q->queuedata;
rw = bio_data_dir(bio);
do_acct = nd_iostat_start(bio, &start);
bio_for_each_segment(bvec, bio, iter) {
unsigned int len = bvec.bv_len;

BUG_ON(len > PAGE_SIZE);
- err = nd_blk_do_bvec(blk_dev, bip, bvec.bv_page, len,
- bvec.bv_offset, rw, iter.bi_sector);
+ err = nsblk_do_bvec(nsblk, bip, bvec.bv_page, len,
+ bvec.bv_offset, rw, iter.bi_sector);
if (err) {
- dev_info(&blk_dev->nsblk->common.dev,
+ dev_dbg(&nsblk->common.dev,
"io error in %s sector %lld, len %d,\n",
(rw == READ) ? "READ" : "WRITE",
(unsigned long long) iter.bi_sector, len);
@@ -205,17 +217,16 @@ static blk_qc_t nd_blk_make_request(struct request_queue *q, struct bio *bio)
return BLK_QC_T_NONE;
}

-static int nd_blk_rw_bytes(struct nd_namespace_common *ndns,
+static int nsblk_rw_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *iobuf, size_t n, int rw)
{
- struct nd_blk_device *blk_dev = dev_get_drvdata(ndns->claim);
- struct nd_namespace_blk *nsblk = blk_dev->nsblk;
- struct nd_blk_region *ndbr = blk_dev->ndbr;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(&ndns->dev);
+ struct nd_blk_region *ndbr = to_ndbr(nsblk);
resource_size_t dev_offset;

dev_offset = to_dev_offset(nsblk, offset, n);

- if (unlikely(offset + n > blk_dev->disk_size)) {
+ if (unlikely(offset + n > nsblk->size)) {
dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
return -EFAULT;
}
@@ -242,16 +253,16 @@ static void nd_blk_release_disk(void *disk)
put_disk(disk);
}

-static int nd_blk_attach_disk(struct device *dev,
- struct nd_namespace_common *ndns, struct nd_blk_device *blk_dev)
+static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
{
+ struct device *dev = &nsblk->common.dev;
resource_size_t available_disk_size;
struct request_queue *q;
struct gendisk *disk;
u64 internal_nlba;

- internal_nlba = div_u64(blk_dev->disk_size, blk_dev->internal_lbasize);
- available_disk_size = internal_nlba * blk_dev->sector_size;
+ internal_nlba = div_u64(nsblk->size, nsblk_internal_lbasize(nsblk));
+ available_disk_size = internal_nlba * nsblk_sector_size(nsblk);

q = blk_alloc_queue(GFP_KERNEL);
if (!q)
@@ -264,9 +275,9 @@ static int nd_blk_attach_disk(struct device *dev,
blk_queue_make_request(q, nd_blk_make_request);
blk_queue_max_hw_sectors(q, UINT_MAX);
blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
- blk_queue_logical_block_size(q, blk_dev->sector_size);
+ blk_queue_logical_block_size(q, nsblk_sector_size(nsblk));
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
- q->queuedata = blk_dev;
+ q->queuedata = nsblk;

disk = alloc_disk(0);
if (!disk)
@@ -276,17 +287,17 @@ static int nd_blk_attach_disk(struct device *dev,
return -ENOMEM;
}

- disk->driverfs_dev = &ndns->dev;
+ disk->driverfs_dev = dev;
disk->first_minor = 0;
disk->fops = &nd_blk_fops;
disk->queue = q;
disk->flags = GENHD_FL_EXT_DEVT;
- nvdimm_namespace_disk_name(ndns, disk->disk_name);
+ nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name);
set_capacity(disk, 0);
add_disk(disk);

- if (nd_blk_meta_size(blk_dev)) {
- int rc = nd_integrity_init(disk, nd_blk_meta_size(blk_dev));
+ if (nsblk_meta_size(nsblk)) {
+ int rc = nd_integrity_init(disk, nsblk_meta_size(nsblk));

if (rc)
return rc;
@@ -301,33 +312,23 @@ static int nd_blk_probe(struct device *dev)
{
struct nd_namespace_common *ndns;
struct nd_namespace_blk *nsblk;
- struct nd_blk_device *blk_dev;

ndns = nvdimm_namespace_common_probe(dev);
if (IS_ERR(ndns))
return PTR_ERR(ndns);

- blk_dev = devm_kzalloc(dev, sizeof(*blk_dev), GFP_KERNEL);
- if (!blk_dev)
- return -ENOMEM;
-
nsblk = to_nd_namespace_blk(&ndns->dev);
- blk_dev->disk_size = nvdimm_namespace_capacity(ndns);
- blk_dev->ndbr = to_nd_blk_region(dev->parent);
- blk_dev->nsblk = to_nd_namespace_blk(&ndns->dev);
- blk_dev->internal_lbasize = roundup(nsblk->lbasize,
- INT_LBASIZE_ALIGNMENT);
- blk_dev->sector_size = ((nsblk->lbasize >= 4096) ? 4096 : 512);
- dev_set_drvdata(dev, blk_dev);
-
- ndns->rw_bytes = nd_blk_rw_bytes;
+ nsblk->size = nvdimm_namespace_capacity(ndns);
+ dev_set_drvdata(dev, nsblk);
+
+ ndns->rw_bytes = nsblk_rw_bytes;
if (is_nd_btt(dev))
return nvdimm_namespace_attach_btt(ndns);
- else if (nd_btt_probe(dev, ndns, blk_dev) == 0) {
+ else if (nd_btt_probe(dev, ndns, nsblk) == 0) {
/* we'll come back as btt-blk */
return -ENXIO;
} else
- return nd_blk_attach_disk(dev, ndns, blk_dev);
+ return nsblk_attach_disk(nsblk);
}

static int nd_blk_remove(struct device *dev)
diff --git a/include/linux/nd.h b/include/linux/nd.h
index 5489ab756d1a..5ea4aec7fd63 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -82,6 +82,7 @@ struct nd_namespace_pmem {
* @uuid: namespace name supplied in the dimm label
* @id: ida allocated id
* @lbasize: blk namespaces have a native sector size when btt not present
+ * @size: sum of all the resource ranges allocated to this namespace
* @num_resources: number of dpa extents to claim
* @res: discontiguous dpa extents for given dimm
*/
@@ -91,6 +92,7 @@ struct nd_namespace_blk {
u8 *uuid;
int id;
unsigned long lbasize;
+ resource_size_t size;
int num_resources;
struct resource **res;
};