forked from Minki/linux
513d6d7a95
We generally want to read and write to a block device that's used by the pNFS block layout client (and even if it's read only the server has no way of telling us). Add FMODE_WRITE to the mode argument so that we don't incorrectly tell the block driver that we want a read-only open. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
369 lines
8.5 KiB
C
369 lines
8.5 KiB
C
/*
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* Copyright (c) 2014 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 "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->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) {
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dprintk("no signature\n");
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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 + b->simple.sigs[i].sig_len;
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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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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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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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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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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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d->bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL);
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if (IS_ERR(d->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(d->bdev));
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return PTR_ERR(d->bdev);
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}
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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 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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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 *
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bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
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gfp_t gfp_mask)
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{
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struct nfs4_deviceid_node *node = NULL;
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struct pnfs_block_volume *volumes;
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struct pnfs_block_dev *top;
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struct xdr_stream xdr;
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struct xdr_buf buf;
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struct page *scratch;
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int nr_volumes, ret, i;
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__be32 *p;
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scratch = alloc_page(gfp_mask);
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if (!scratch)
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goto out;
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xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
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xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
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p = xdr_inline_decode(&xdr, sizeof(__be32));
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if (!p)
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goto out_free_scratch;
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nr_volumes = be32_to_cpup(p++);
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volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
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gfp_mask);
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if (!volumes)
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goto out_free_scratch;
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for (i = 0; i < nr_volumes; i++) {
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ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
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if (ret < 0)
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goto out_free_volumes;
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}
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top = kzalloc(sizeof(*top), gfp_mask);
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if (!top)
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goto out_free_volumes;
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ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
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if (ret) {
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bl_free_device(top);
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kfree(top);
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goto out_free_volumes;
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}
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node = &top->node;
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nfs4_init_deviceid_node(node, server, &pdev->dev_id);
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out_free_volumes:
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kfree(volumes);
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out_free_scratch:
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__free_page(scratch);
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out:
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return node;
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}
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