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libnvdimm, blk: move i/o infrastructure to nd_namespace_blk 

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

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-03-18 11:27:36 -07:00
parent 8378af17a4
commit 9d90725ddc
2 changed files with 72 additions and 69 deletions
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139
drivers/nvdimm/blk.c
View File

@ -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 nd_blk_meta_size(struct nd_blk_device *blk_dev)
static u32 nsblk_meta_size(struct nd_namespace_blk *nsblk)
{
return blk_dev->nsblk->lbasize - blk_dev->sector_size;
return nsblk->lbasize - ((nsblk->lbasize >= 4096) ? 4096 : 512);
}
static u32 nsblk_internal_lbasize(struct nd_namespace_blk *nsblk)
{
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;
}
#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 struct nd_blk_region *to_ndbr(struct nd_namespace_blk *nsblk)
{
unsigned int len = nd_blk_meta_size(blk_dev);
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_namespace_blk *nsblk,
struct bio_integrity_payload *bip, u64 lba, int rw)
{
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_dbg(&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);
nsblk->size = nvdimm_namespace_capacity(ndns);
dev_set_drvdata(dev, nsblk);
ndns->rw_bytes = nd_blk_rw_bytes;
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)

2
include/linux/nd.h
View File

@ -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;
};