mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
528 lines
13 KiB
528 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Copyright (c) 2014-2016 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 <linux/pr.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->pr_registered) { |
|
const struct pr_ops *ops = |
|
dev->bdev->bd_disk->fops->pr_ops; |
|
int error; |
|
|
|
error = ops->pr_register(dev->bdev, dev->pr_key, 0, |
|
false); |
|
if (error) |
|
pr_err("failed to unregister PR key.\n"); |
|
} |
|
|
|
if (dev->bdev) |
|
blkdev_put(dev->bdev, FMODE_READ | FMODE_WRITE); |
|
} |
|
} |
|
|
|
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_rcu(dev, node.rcu); |
|
} |
|
|
|
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 || b->simple.nr_sigs > PNFS_BLOCK_MAX_UUIDS) { |
|
dprintk("Bad signature count: %d\n", b->simple.nr_sigs); |
|
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++); |
|
if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) { |
|
pr_info("signature too long: %d\n", |
|
b->simple.sigs[i].sig_len); |
|
return -EIO; |
|
} |
|
|
|
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 + \ |
|
(XDR_QUADLEN(b->simple.sigs[i].sig_len) << 2); |
|
} |
|
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++); |
|
if (b->concat.volumes_count > PNFS_BLOCK_MAX_DEVICES) { |
|
dprintk("Too many volumes: %d\n", b->concat.volumes_count); |
|
return -EIO; |
|
} |
|
|
|
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++); |
|
if (b->stripe.volumes_count > PNFS_BLOCK_MAX_DEVICES) { |
|
dprintk("Too many volumes: %d\n", b->stripe.volumes_count); |
|
return -EIO; |
|
} |
|
|
|
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; |
|
case PNFS_BLOCK_VOLUME_SCSI: |
|
p = xdr_inline_decode(xdr, 4 + 4 + 4); |
|
if (!p) |
|
return -EIO; |
|
b->scsi.code_set = be32_to_cpup(p++); |
|
b->scsi.designator_type = be32_to_cpup(p++); |
|
b->scsi.designator_len = be32_to_cpup(p++); |
|
p = xdr_inline_decode(xdr, b->scsi.designator_len); |
|
if (!p) |
|
return -EIO; |
|
if (b->scsi.designator_len > 256) |
|
return -EIO; |
|
memcpy(&b->scsi.designator, p, b->scsi.designator_len); |
|
p = xdr_inline_decode(xdr, 8); |
|
if (!p) |
|
return -EIO; |
|
p = xdr_decode_hyper(p, &b->scsi.pr_key); |
|
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]; |
|
struct block_device *bdev; |
|
dev_t dev; |
|
|
|
dev = bl_resolve_deviceid(server, v, gfp_mask); |
|
if (!dev) |
|
return -EIO; |
|
|
|
bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL); |
|
if (IS_ERR(bdev)) { |
|
printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n", |
|
MAJOR(dev), MINOR(dev), PTR_ERR(bdev)); |
|
return PTR_ERR(bdev); |
|
} |
|
d->bdev = bdev; |
|
|
|
|
|
d->len = bdev_nr_bytes(d->bdev); |
|
d->map = bl_map_simple; |
|
|
|
printk(KERN_INFO "pNFS: using block device %s\n", |
|
d->bdev->bd_disk->disk_name); |
|
return 0; |
|
} |
|
|
|
static bool |
|
bl_validate_designator(struct pnfs_block_volume *v) |
|
{ |
|
switch (v->scsi.designator_type) { |
|
case PS_DESIGNATOR_EUI64: |
|
if (v->scsi.code_set != PS_CODE_SET_BINARY) |
|
return false; |
|
|
|
if (v->scsi.designator_len != 8 && |
|
v->scsi.designator_len != 10 && |
|
v->scsi.designator_len != 16) |
|
return false; |
|
|
|
return true; |
|
case PS_DESIGNATOR_NAA: |
|
if (v->scsi.code_set != PS_CODE_SET_BINARY) |
|
return false; |
|
|
|
if (v->scsi.designator_len != 8 && |
|
v->scsi.designator_len != 16) |
|
return false; |
|
|
|
return true; |
|
case PS_DESIGNATOR_T10: |
|
case PS_DESIGNATOR_NAME: |
|
pr_err("pNFS: unsupported designator " |
|
"(code set %d, type %d, len %d.\n", |
|
v->scsi.code_set, |
|
v->scsi.designator_type, |
|
v->scsi.designator_len); |
|
return false; |
|
default: |
|
pr_err("pNFS: invalid designator " |
|
"(code set %d, type %d, len %d.\n", |
|
v->scsi.code_set, |
|
v->scsi.designator_type, |
|
v->scsi.designator_len); |
|
return false; |
|
} |
|
} |
|
|
|
static struct block_device * |
|
bl_open_path(struct pnfs_block_volume *v, const char *prefix) |
|
{ |
|
struct block_device *bdev; |
|
const char *devname; |
|
|
|
devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/%s%*phN", |
|
prefix, v->scsi.designator_len, v->scsi.designator); |
|
if (!devname) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL); |
|
if (IS_ERR(bdev)) { |
|
pr_warn("pNFS: failed to open device %s (%ld)\n", |
|
devname, PTR_ERR(bdev)); |
|
} |
|
|
|
kfree(devname); |
|
return bdev; |
|
} |
|
|
|
static int |
|
bl_parse_scsi(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]; |
|
struct block_device *bdev; |
|
const struct pr_ops *ops; |
|
int error; |
|
|
|
if (!bl_validate_designator(v)) |
|
return -EINVAL; |
|
|
|
/* |
|
* Try to open the RH/Fedora specific dm-mpath udev path first, as the |
|
* wwn- links will only point to the first discovered SCSI device there. |
|
* On other distributions like Debian, the default SCSI by-id path will |
|
* point to the dm-multipath device if one exists. |
|
*/ |
|
bdev = bl_open_path(v, "dm-uuid-mpath-0x"); |
|
if (IS_ERR(bdev)) |
|
bdev = bl_open_path(v, "wwn-0x"); |
|
if (IS_ERR(bdev)) |
|
return PTR_ERR(bdev); |
|
d->bdev = bdev; |
|
|
|
d->len = bdev_nr_bytes(d->bdev); |
|
d->map = bl_map_simple; |
|
d->pr_key = v->scsi.pr_key; |
|
|
|
pr_info("pNFS: using block device %s (reservation key 0x%llx)\n", |
|
d->bdev->bd_disk->disk_name, d->pr_key); |
|
|
|
ops = d->bdev->bd_disk->fops->pr_ops; |
|
if (!ops) { |
|
pr_err("pNFS: block device %s does not support reservations.", |
|
d->bdev->bd_disk->disk_name); |
|
error = -EINVAL; |
|
goto out_blkdev_put; |
|
} |
|
|
|
error = ops->pr_register(d->bdev, 0, d->pr_key, true); |
|
if (error) { |
|
pr_err("pNFS: failed to register key for block device %s.", |
|
d->bdev->bd_disk->disk_name); |
|
goto out_blkdev_put; |
|
} |
|
|
|
d->pr_registered = true; |
|
return 0; |
|
|
|
out_blkdev_put: |
|
blkdev_put(d->bdev, FMODE_READ | FMODE_WRITE); |
|
return error; |
|
} |
|
|
|
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); |
|
case PNFS_BLOCK_VOLUME_SCSI: |
|
return bl_parse_scsi(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_page(&xdr, scratch); |
|
|
|
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); |
|
|
|
node = &top->node; |
|
nfs4_init_deviceid_node(node, server, &pdev->dev_id); |
|
if (ret) |
|
nfs4_mark_deviceid_unavailable(node); |
|
|
|
out_free_volumes: |
|
kfree(volumes); |
|
out_free_scratch: |
|
__free_page(scratch); |
|
out: |
|
return node; |
|
}
|
|
|