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/*
* Copyright (c) 2014 Christoph Hellwig.
*/
#include <linux/sunrpc/svc.h>
#include <linux/blkdev.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_xdr.h>
#include "blocklayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
static void
bl_free_device(struct pnfs_block_dev *dev)
{
if (dev->nr_children) {
int i;
for (i = 0; i < dev->nr_children; i++)
bl_free_device(&dev->children[i]);
kfree(dev->children);
} else {
if (dev->bdev)
blkdev_put(dev->bdev, FMODE_READ);
}
}
void
bl_free_deviceid_node(struct nfs4_deviceid_node *d)
{
struct pnfs_block_dev *dev =
container_of(d, struct pnfs_block_dev, node);
bl_free_device(dev);
kfree(dev);
}
static int
nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
{
__be32 *p;
int i;
p = xdr_inline_decode(xdr, 4);
if (!p)
return -EIO;
b->type = be32_to_cpup(p++);
switch (b->type) {
case PNFS_BLOCK_VOLUME_SIMPLE:
p = xdr_inline_decode(xdr, 4);
if (!p)
return -EIO;
b->simple.nr_sigs = be32_to_cpup(p++);
if (!b->simple.nr_sigs) {
dprintk("no signature\n");
return -EIO;
}
b->simple.len = 4 + 4;
for (i = 0; i < b->simple.nr_sigs; i++) {
p = xdr_inline_decode(xdr, 8 + 4);
if (!p)
return -EIO;
p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
b->simple.sigs[i].sig_len = be32_to_cpup(p++);
p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
if (!p)
return -EIO;
memcpy(&b->simple.sigs[i].sig, p,
b->simple.sigs[i].sig_len);
b->simple.len += 8 + 4 + b->simple.sigs[i].sig_len;
}
break;
case PNFS_BLOCK_VOLUME_SLICE:
p = xdr_inline_decode(xdr, 8 + 8 + 4);
if (!p)
return -EIO;
p = xdr_decode_hyper(p, &b->slice.start);
p = xdr_decode_hyper(p, &b->slice.len);
b->slice.volume = be32_to_cpup(p++);
break;
case PNFS_BLOCK_VOLUME_CONCAT:
p = xdr_inline_decode(xdr, 4);
if (!p)
return -EIO;
b->concat.volumes_count = be32_to_cpup(p++);
p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
if (!p)
return -EIO;
for (i = 0; i < b->concat.volumes_count; i++)
b->concat.volumes[i] = be32_to_cpup(p++);
break;
case PNFS_BLOCK_VOLUME_STRIPE:
p = xdr_inline_decode(xdr, 8 + 4);
if (!p)
return -EIO;
p = xdr_decode_hyper(p, &b->stripe.chunk_size);
b->stripe.volumes_count = be32_to_cpup(p++);
p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
if (!p)
return -EIO;
for (i = 0; i < b->stripe.volumes_count; i++)
b->stripe.volumes[i] = be32_to_cpup(p++);
break;
default:
dprintk("unknown volume type!\n");
return -EIO;
}
return 0;
}
static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
struct pnfs_block_dev_map *map)
{
map->start = dev->start;
map->len = dev->len;
map->disk_offset = dev->disk_offset;
map->bdev = dev->bdev;
return true;
}
static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
struct pnfs_block_dev_map *map)
{
int i;
for (i = 0; i < dev->nr_children; i++) {
struct pnfs_block_dev *child = &dev->children[i];
if (child->start > offset ||
child->start + child->len <= offset)
continue;
child->map(child, offset - child->start, map);
return true;
}
dprintk("%s: ran off loop!\n", __func__);
return false;
}
static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
struct pnfs_block_dev_map *map)
{
struct pnfs_block_dev *child;
u64 chunk;
u32 chunk_idx;
u64 disk_offset;
chunk = div_u64(offset, dev->chunk_size);
div_u64_rem(chunk, dev->nr_children, &chunk_idx);
if (chunk_idx > dev->nr_children) {
dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
__func__, chunk_idx, offset, dev->chunk_size);
/* error, should not happen */
return false;
}
/* truncate offset to the beginning of the stripe */
offset = chunk * dev->chunk_size;
/* disk offset of the stripe */
disk_offset = div_u64(offset, dev->nr_children);
child = &dev->children[chunk_idx];
child->map(child, disk_offset, map);
map->start += offset;
map->disk_offset += disk_offset;
map->len = dev->chunk_size;
return true;
}
static int
bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
static int
bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d,
struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
struct pnfs_block_volume *v = &volumes[idx];
dev_t dev;
dev = bl_resolve_deviceid(server, v, gfp_mask);
if (!dev)
return -EIO;
d->bdev = blkdev_get_by_dev(dev, FMODE_READ, NULL);
if (IS_ERR(d->bdev)) {
printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
MAJOR(dev), MINOR(dev), PTR_ERR(d->bdev));
return PTR_ERR(d->bdev);
}
d->len = i_size_read(d->bdev->bd_inode);
d->map = bl_map_simple;
printk(KERN_INFO "pNFS: using block device %s\n",
d->bdev->bd_disk->disk_name);
return 0;
}
static int
bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d,
struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
struct pnfs_block_volume *v = &volumes[idx];
int ret;
ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
if (ret)
return ret;
d->disk_offset = v->slice.start;
d->len = v->slice.len;
return 0;
}
static int
bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d,
struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
struct pnfs_block_volume *v = &volumes[idx];
u64 len = 0;
int ret, i;
d->children = kcalloc(v->concat.volumes_count,
sizeof(struct pnfs_block_dev), GFP_KERNEL);
if (!d->children)
return -ENOMEM;
for (i = 0; i < v->concat.volumes_count; i++) {
ret = bl_parse_deviceid(server, &d->children[i],
volumes, v->concat.volumes[i], gfp_mask);
if (ret)
return ret;
d->nr_children++;
d->children[i].start += len;
len += d->children[i].len;
}
d->len = len;
d->map = bl_map_concat;
return 0;
}
static int
bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d,
struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
struct pnfs_block_volume *v = &volumes[idx];
u64 len = 0;
int ret, i;
d->children = kcalloc(v->stripe.volumes_count,
sizeof(struct pnfs_block_dev), GFP_KERNEL);
if (!d->children)
return -ENOMEM;
for (i = 0; i < v->stripe.volumes_count; i++) {
ret = bl_parse_deviceid(server, &d->children[i],
volumes, v->stripe.volumes[i], gfp_mask);
if (ret)
return ret;
d->nr_children++;
len += d->children[i].len;
}
d->len = len;
d->chunk_size = v->stripe.chunk_size;
d->map = bl_map_stripe;
return 0;
}
static int
bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
switch (volumes[idx].type) {
case PNFS_BLOCK_VOLUME_SIMPLE:
return bl_parse_simple(server, d, volumes, idx, gfp_mask);
case PNFS_BLOCK_VOLUME_SLICE:
return bl_parse_slice(server, d, volumes, idx, gfp_mask);
case PNFS_BLOCK_VOLUME_CONCAT:
return bl_parse_concat(server, d, volumes, idx, gfp_mask);
case PNFS_BLOCK_VOLUME_STRIPE:
return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
default:
dprintk("unsupported volume type: %d\n", volumes[idx].type);
return -EIO;
}
}
struct nfs4_deviceid_node *
bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
gfp_t gfp_mask)
{
struct nfs4_deviceid_node *node = NULL;
struct pnfs_block_volume *volumes;
struct pnfs_block_dev *top;
struct xdr_stream xdr;
struct xdr_buf buf;
struct page *scratch;
int nr_volumes, ret, i;
__be32 *p;
scratch = alloc_page(gfp_mask);
if (!scratch)
goto out;
xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
p = xdr_inline_decode(&xdr, sizeof(__be32));
if (!p)
goto out_free_scratch;
nr_volumes = be32_to_cpup(p++);
volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
gfp_mask);
if (!volumes)
goto out_free_scratch;
for (i = 0; i < nr_volumes; i++) {
ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
if (ret < 0)
goto out_free_volumes;
}
top = kzalloc(sizeof(*top), gfp_mask);
if (!top)
goto out_free_volumes;
ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
if (ret) {
bl_free_device(top);
kfree(top);
goto out_free_volumes;
}
node = &top->node;
nfs4_init_deviceid_node(node, server, &pdev->dev_id);
out_free_volumes:
kfree(volumes);
out_free_scratch:
__free_page(scratch);
out:
return node;
}
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