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#include "blocklayout.h"#include "../nfs4trace.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
#ifdef CONFIG_PNFS_SCSI_LAYOUTstatic void bl_unregister_scsi(struct pnfs_block_dev *dev){ struct block_device *bdev = file_bdev(dev->bdev_file); const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; int status;
status = ops->pr_register(bdev, dev->pr_key, 0, false); if (status) trace_bl_pr_key_unreg_err(bdev, dev->pr_key, status); else trace_bl_pr_key_unreg(bdev, dev->pr_key);}
static bool bl_register_scsi(struct pnfs_block_dev *dev){ struct block_device *bdev = file_bdev(dev->bdev_file); const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; int status;
if (test_and_set_bit(PNFS_BDEV_REGISTERED, &dev->flags)) return true;
status = ops->pr_register(bdev, 0, dev->pr_key, true); if (status) { trace_bl_pr_key_reg_err(bdev, dev->pr_key, status); return false; } trace_bl_pr_key_reg(bdev, dev->pr_key); return true;}#elsestatic void bl_unregister_scsi(struct pnfs_block_dev *dev){}
static bool bl_register_scsi(struct pnfs_block_dev *dev){ return false;}#endif /* CONFIG_PNFS_SCSI_LAYOUT */
static void bl_unregister_dev(struct pnfs_block_dev *dev){ u32 i;
if (dev->nr_children) { for (i = 0; i < dev->nr_children; i++) bl_unregister_dev(&dev->children[i]); return; }
if (dev->type == PNFS_BLOCK_VOLUME_SCSI && test_and_clear_bit(PNFS_BDEV_REGISTERED, &dev->flags)) bl_unregister_scsi(dev);}
bool bl_register_dev(struct pnfs_block_dev *dev){ u32 i;
if (dev->nr_children) { for (i = 0; i < dev->nr_children; i++) { if (!bl_register_dev(&dev->children[i])) { while (i > 0) bl_unregister_dev(&dev->children[--i]); return false; } } return true; }
if (dev->type == PNFS_BLOCK_VOLUME_SCSI) return bl_register_scsi(dev); return true;}
static voidbl_free_device(struct pnfs_block_dev *dev){ bl_unregister_dev(dev);
if (dev->children) { int i;
for (i = 0; i < dev->nr_children; i++) bl_free_device(&dev->children[i]); kfree(dev->children); dev->children = NULL; dev->nr_children = 0; } else if (dev->bdev_file) { fput(dev->bdev_file); dev->bdev_file = NULL; }}
voidbl_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 intnfs4_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 = file_bdev(dev->bdev_file); 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_chunk; u64 disk_offset;
chunk = div_u64(offset, dev->chunk_size); disk_chunk = 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 = disk_chunk * dev->chunk_size;
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 intbl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
#ifdef CONFIG_PNFS_BLOCK_LAYOUTstatic intbl_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 file *bdev_file; dev_t dev;
dev = bl_resolve_deviceid(server, v, gfp_mask); if (!dev) return -EIO;
bdev_file = bdev_file_open_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_WRITE, NULL, NULL); if (IS_ERR(bdev_file)) { printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n", MAJOR(dev), MINOR(dev), PTR_ERR(bdev_file)); return PTR_ERR(bdev_file); } d->bdev_file = bdev_file; d->len = bdev_nr_bytes(file_bdev(bdev_file)); d->map = bl_map_simple;
printk(KERN_INFO "pNFS: using block device %s\n", file_bdev(bdev_file)->bd_disk->disk_name); return 0;}#elsestatic intbl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask){ dprintk("unsupported volume type: %d\n", PNFS_BLOCK_VOLUME_SIMPLE); return -EIO;}#endif /* CONFIG_PNFS_BLOCK_LAYOUT */
#ifdef CONFIG_PNFS_SCSI_LAYOUTstatic boolbl_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 file *bl_open_path(struct pnfs_block_volume *v, const char *prefix){ struct file *bdev_file; const char *devname __free(kfree) = NULL;
devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/%s%*phN", prefix, v->scsi.designator_len, v->scsi.designator); if (!devname) return ERR_PTR(-ENOMEM);
if (tsk_is_kthread(current)) { scoped_with_init_fs() bdev_file = bdev_file_open_by_path(devname, BLK_OPEN_READ | BLK_OPEN_WRITE, NULL, NULL); } else { bdev_file = bdev_file_open_by_path(devname, BLK_OPEN_READ | BLK_OPEN_WRITE, NULL, NULL); } if (IS_ERR(bdev_file)) { dprintk("failed to open device %s (%ld)\n", devname, PTR_ERR(bdev_file)); } else { pr_info("pNFS: using block device %s\n", file_bdev(bdev_file)->bd_disk->disk_name); }
return bdev_file;}
static intbl_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; struct file *bdev_file; 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_file = bl_open_path(v, "dm-uuid-mpath-0x"); if (IS_ERR(bdev_file)) bdev_file = bl_open_path(v, "wwn-0x"); if (IS_ERR(bdev_file)) bdev_file = bl_open_path(v, "nvme-eui."); if (IS_ERR(bdev_file)) { pr_warn("pNFS: no device found for volume %*phN\n", v->scsi.designator_len, v->scsi.designator); return PTR_ERR(bdev_file); } d->bdev_file = bdev_file; bdev = file_bdev(bdev_file);
d->len = bdev_nr_bytes(bdev); d->map = bl_map_simple; d->pr_key = v->scsi.pr_key;
if (d->len == 0) { error = -ENODEV; goto out_blkdev_put; }
ops = bdev->bd_disk->fops->pr_ops; if (!ops) { pr_err("pNFS: block device %s does not support reservations.", bdev->bd_disk->disk_name); error = -EINVAL; goto out_blkdev_put; }
return 0;
out_blkdev_put: fput(d->bdev_file); d->bdev_file = NULL; return error;}#elsestatic intbl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask){ dprintk("unsupported volume type: %d\n", PNFS_BLOCK_VOLUME_SCSI); return -EIO;}#endif /* CONFIG_PNFS_SCSI_LAYOUT */
static intbl_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 intbl_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 = kzalloc_objs(struct pnfs_block_dev, v->concat.volumes_count, gfp_mask); 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) { bl_free_device(&d->children[i]); bl_free_device(d); 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 intbl_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 = kzalloc_objs(struct pnfs_block_dev, v->stripe.volumes_count, gfp_mask); 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) { bl_free_device(&d->children[i]); bl_free_device(d); 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 intbl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask){ d->type = volumes[idx].type;
switch (d->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", d->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 folio *scratch; int nr_volumes, ret, i; __be32 *p;
scratch = folio_alloc(gfp_mask, 0); if (!scratch) goto out;
xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen); xdr_set_scratch_folio(&xdr, scratch);
p = xdr_inline_decode(&xdr, sizeof(__be32)); if (!p) goto out_free_scratch; nr_volumes = be32_to_cpup(p++);
volumes = kzalloc_objs(struct pnfs_block_volume, nr_volumes, 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_obj(*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: folio_put(scratch);out: return node;}