551 lines
13 KiB
C
551 lines
13 KiB
C
/*
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* Copyright (c) 2014-2016 Christoph Hellwig.
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*/
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#include <linux/sunrpc/svc.h>
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#include <linux/blkdev.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_xdr.h>
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#include <linux/pr.h>
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#include "blocklayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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static void
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bl_free_device(struct pnfs_block_dev *dev)
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{
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if (dev->nr_children) {
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int i;
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for (i = 0; i < dev->nr_children; i++)
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bl_free_device(&dev->children[i]);
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kfree(dev->children);
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} else {
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if (dev->pr_registered) {
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const struct pr_ops *ops =
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dev->bdev->bd_disk->fops->pr_ops;
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int error;
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error = ops->pr_register(dev->bdev, dev->pr_key, 0,
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false);
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if (error)
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pr_err("failed to unregister PR key.\n");
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}
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if (dev->bdev)
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blkdev_put(dev->bdev, FMODE_READ | FMODE_WRITE);
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}
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}
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void
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bl_free_deviceid_node(struct nfs4_deviceid_node *d)
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{
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struct pnfs_block_dev *dev =
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container_of(d, struct pnfs_block_dev, node);
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bl_free_device(dev);
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kfree_rcu(dev, node.rcu);
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}
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static int
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nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
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{
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__be32 *p;
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int i;
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p = xdr_inline_decode(xdr, 4);
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if (!p)
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return -EIO;
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b->type = be32_to_cpup(p++);
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switch (b->type) {
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case PNFS_BLOCK_VOLUME_SIMPLE:
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p = xdr_inline_decode(xdr, 4);
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if (!p)
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return -EIO;
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b->simple.nr_sigs = be32_to_cpup(p++);
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if (!b->simple.nr_sigs || b->simple.nr_sigs > PNFS_BLOCK_MAX_UUIDS) {
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dprintk("Bad signature count: %d\n", b->simple.nr_sigs);
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return -EIO;
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}
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b->simple.len = 4 + 4;
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for (i = 0; i < b->simple.nr_sigs; i++) {
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p = xdr_inline_decode(xdr, 8 + 4);
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if (!p)
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return -EIO;
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p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
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b->simple.sigs[i].sig_len = be32_to_cpup(p++);
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if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) {
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pr_info("signature too long: %d\n",
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b->simple.sigs[i].sig_len);
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return -EIO;
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}
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p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
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if (!p)
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return -EIO;
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memcpy(&b->simple.sigs[i].sig, p,
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b->simple.sigs[i].sig_len);
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b->simple.len += 8 + 4 + \
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(XDR_QUADLEN(b->simple.sigs[i].sig_len) << 2);
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}
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break;
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case PNFS_BLOCK_VOLUME_SLICE:
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p = xdr_inline_decode(xdr, 8 + 8 + 4);
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if (!p)
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return -EIO;
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p = xdr_decode_hyper(p, &b->slice.start);
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p = xdr_decode_hyper(p, &b->slice.len);
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b->slice.volume = be32_to_cpup(p++);
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break;
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case PNFS_BLOCK_VOLUME_CONCAT:
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p = xdr_inline_decode(xdr, 4);
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if (!p)
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return -EIO;
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b->concat.volumes_count = be32_to_cpup(p++);
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if (b->concat.volumes_count > PNFS_BLOCK_MAX_DEVICES) {
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dprintk("Too many volumes: %d\n", b->concat.volumes_count);
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return -EIO;
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}
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p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
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if (!p)
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return -EIO;
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for (i = 0; i < b->concat.volumes_count; i++)
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b->concat.volumes[i] = be32_to_cpup(p++);
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break;
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case PNFS_BLOCK_VOLUME_STRIPE:
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p = xdr_inline_decode(xdr, 8 + 4);
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if (!p)
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return -EIO;
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p = xdr_decode_hyper(p, &b->stripe.chunk_size);
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b->stripe.volumes_count = be32_to_cpup(p++);
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if (b->stripe.volumes_count > PNFS_BLOCK_MAX_DEVICES) {
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dprintk("Too many volumes: %d\n", b->stripe.volumes_count);
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return -EIO;
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}
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p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
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if (!p)
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return -EIO;
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for (i = 0; i < b->stripe.volumes_count; i++)
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b->stripe.volumes[i] = be32_to_cpup(p++);
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break;
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case PNFS_BLOCK_VOLUME_SCSI:
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p = xdr_inline_decode(xdr, 4 + 4 + 4);
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if (!p)
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return -EIO;
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b->scsi.code_set = be32_to_cpup(p++);
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b->scsi.designator_type = be32_to_cpup(p++);
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b->scsi.designator_len = be32_to_cpup(p++);
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p = xdr_inline_decode(xdr, b->scsi.designator_len);
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if (!p)
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return -EIO;
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if (b->scsi.designator_len > 256)
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return -EIO;
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memcpy(&b->scsi.designator, p, b->scsi.designator_len);
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p = xdr_inline_decode(xdr, 8);
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if (!p)
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return -EIO;
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p = xdr_decode_hyper(p, &b->scsi.pr_key);
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break;
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default:
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dprintk("unknown volume type!\n");
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return -EIO;
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}
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return 0;
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}
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static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
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struct pnfs_block_dev_map *map)
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{
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map->start = dev->start;
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map->len = dev->len;
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map->disk_offset = dev->disk_offset;
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map->bdev = dev->bdev;
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return true;
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}
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static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
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struct pnfs_block_dev_map *map)
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{
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int i;
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for (i = 0; i < dev->nr_children; i++) {
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struct pnfs_block_dev *child = &dev->children[i];
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if (child->start > offset ||
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child->start + child->len <= offset)
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continue;
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child->map(child, offset - child->start, map);
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return true;
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}
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dprintk("%s: ran off loop!\n", __func__);
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return false;
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}
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static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
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struct pnfs_block_dev_map *map)
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{
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struct pnfs_block_dev *child;
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u64 chunk;
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u32 chunk_idx;
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u64 disk_offset;
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chunk = div_u64(offset, dev->chunk_size);
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div_u64_rem(chunk, dev->nr_children, &chunk_idx);
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if (chunk_idx >= dev->nr_children) {
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dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
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__func__, chunk_idx, offset, dev->chunk_size);
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/* error, should not happen */
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return false;
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}
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/* truncate offset to the beginning of the stripe */
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offset = chunk * dev->chunk_size;
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/* disk offset of the stripe */
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disk_offset = div_u64(offset, dev->nr_children);
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child = &dev->children[chunk_idx];
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child->map(child, disk_offset, map);
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map->start += offset;
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map->disk_offset += disk_offset;
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map->len = dev->chunk_size;
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return true;
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}
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static int
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bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
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struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
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static int
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bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d,
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struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
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{
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struct pnfs_block_volume *v = &volumes[idx];
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struct block_device *bdev;
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dev_t dev;
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dev = bl_resolve_deviceid(server, v, gfp_mask);
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if (!dev)
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return -EIO;
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bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL);
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if (IS_ERR(bdev)) {
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printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
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MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
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return PTR_ERR(bdev);
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}
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d->bdev = bdev;
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d->len = i_size_read(d->bdev->bd_inode);
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d->map = bl_map_simple;
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printk(KERN_INFO "pNFS: using block device %s\n",
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d->bdev->bd_disk->disk_name);
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return 0;
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}
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static bool
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bl_validate_designator(struct pnfs_block_volume *v)
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{
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switch (v->scsi.designator_type) {
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case PS_DESIGNATOR_EUI64:
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if (v->scsi.code_set != PS_CODE_SET_BINARY)
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return false;
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if (v->scsi.designator_len != 8 &&
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v->scsi.designator_len != 10 &&
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v->scsi.designator_len != 16)
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return false;
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return true;
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case PS_DESIGNATOR_NAA:
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if (v->scsi.code_set != PS_CODE_SET_BINARY)
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return false;
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if (v->scsi.designator_len != 8 &&
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v->scsi.designator_len != 16)
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return false;
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return true;
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case PS_DESIGNATOR_T10:
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case PS_DESIGNATOR_NAME:
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pr_err("pNFS: unsupported designator "
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"(code set %d, type %d, len %d.\n",
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v->scsi.code_set,
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v->scsi.designator_type,
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v->scsi.designator_len);
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return false;
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default:
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pr_err("pNFS: invalid designator "
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"(code set %d, type %d, len %d.\n",
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v->scsi.code_set,
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v->scsi.designator_type,
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v->scsi.designator_len);
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return false;
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}
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}
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/*
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* Try to open the udev path for the WWN. At least on Debian the udev
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* by-id path will always point to the dm-multipath device if one exists.
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*/
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static struct block_device *
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bl_open_udev_path(struct pnfs_block_volume *v)
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{
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struct block_device *bdev;
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const char *devname;
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devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%*phN",
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v->scsi.designator_len, v->scsi.designator);
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if (!devname)
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return ERR_PTR(-ENOMEM);
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bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);
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if (IS_ERR(bdev)) {
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pr_warn("pNFS: failed to open device %s (%ld)\n",
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devname, PTR_ERR(bdev));
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}
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kfree(devname);
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return bdev;
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}
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/*
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* Try to open the RH/Fedora specific dm-mpath udev path for this WWN, as the
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* wwn- links will only point to the first discovered SCSI device there.
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*/
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static struct block_device *
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bl_open_dm_mpath_udev_path(struct pnfs_block_volume *v)
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{
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struct block_device *bdev;
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const char *devname;
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devname = kasprintf(GFP_KERNEL,
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"/dev/disk/by-id/dm-uuid-mpath-%d%*phN",
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v->scsi.designator_type,
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v->scsi.designator_len, v->scsi.designator);
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if (!devname)
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return ERR_PTR(-ENOMEM);
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bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);
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kfree(devname);
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return bdev;
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}
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static int
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bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
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struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
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{
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struct pnfs_block_volume *v = &volumes[idx];
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struct block_device *bdev;
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const struct pr_ops *ops;
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int error;
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if (!bl_validate_designator(v))
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return -EINVAL;
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bdev = bl_open_dm_mpath_udev_path(v);
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if (IS_ERR(bdev))
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bdev = bl_open_udev_path(v);
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if (IS_ERR(bdev))
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return PTR_ERR(bdev);
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d->bdev = bdev;
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d->len = i_size_read(d->bdev->bd_inode);
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d->map = bl_map_simple;
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d->pr_key = v->scsi.pr_key;
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pr_info("pNFS: using block device %s (reservation key 0x%llx)\n",
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d->bdev->bd_disk->disk_name, d->pr_key);
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ops = d->bdev->bd_disk->fops->pr_ops;
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if (!ops) {
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pr_err("pNFS: block device %s does not support reservations.",
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d->bdev->bd_disk->disk_name);
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error = -EINVAL;
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goto out_blkdev_put;
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}
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error = ops->pr_register(d->bdev, 0, d->pr_key, true);
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if (error) {
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pr_err("pNFS: failed to register key for block device %s.",
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d->bdev->bd_disk->disk_name);
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goto out_blkdev_put;
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}
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d->pr_registered = true;
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return 0;
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out_blkdev_put:
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blkdev_put(d->bdev, FMODE_READ | FMODE_WRITE);
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return error;
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}
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static int
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bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d,
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struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
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{
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struct pnfs_block_volume *v = &volumes[idx];
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int ret;
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ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
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if (ret)
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return ret;
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d->disk_offset = v->slice.start;
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d->len = v->slice.len;
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return 0;
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}
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static int
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bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d,
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struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
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{
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struct pnfs_block_volume *v = &volumes[idx];
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u64 len = 0;
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int ret, i;
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d->children = kcalloc(v->concat.volumes_count,
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sizeof(struct pnfs_block_dev), GFP_KERNEL);
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if (!d->children)
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return -ENOMEM;
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for (i = 0; i < v->concat.volumes_count; i++) {
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ret = bl_parse_deviceid(server, &d->children[i],
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volumes, v->concat.volumes[i], gfp_mask);
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if (ret)
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return ret;
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d->nr_children++;
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d->children[i].start += len;
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len += d->children[i].len;
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}
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d->len = len;
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d->map = bl_map_concat;
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return 0;
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}
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static int
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bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d,
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struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
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{
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struct pnfs_block_volume *v = &volumes[idx];
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u64 len = 0;
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int ret, i;
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d->children = kcalloc(v->stripe.volumes_count,
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sizeof(struct pnfs_block_dev), GFP_KERNEL);
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if (!d->children)
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return -ENOMEM;
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for (i = 0; i < v->stripe.volumes_count; i++) {
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ret = bl_parse_deviceid(server, &d->children[i],
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volumes, v->stripe.volumes[i], gfp_mask);
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if (ret)
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return ret;
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d->nr_children++;
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len += d->children[i].len;
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}
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d->len = len;
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d->chunk_size = v->stripe.chunk_size;
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d->map = bl_map_stripe;
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return 0;
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}
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static int
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bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
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struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
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{
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switch (volumes[idx].type) {
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case PNFS_BLOCK_VOLUME_SIMPLE:
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return bl_parse_simple(server, d, volumes, idx, gfp_mask);
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case PNFS_BLOCK_VOLUME_SLICE:
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return bl_parse_slice(server, d, volumes, idx, gfp_mask);
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case PNFS_BLOCK_VOLUME_CONCAT:
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return bl_parse_concat(server, d, volumes, idx, gfp_mask);
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case PNFS_BLOCK_VOLUME_STRIPE:
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return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
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case PNFS_BLOCK_VOLUME_SCSI:
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return bl_parse_scsi(server, d, volumes, idx, gfp_mask);
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default:
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dprintk("unsupported volume type: %d\n", volumes[idx].type);
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return -EIO;
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}
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}
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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;
|
|
}
|