158 lines
3.5 KiB
C
158 lines
3.5 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/exportfs.h>
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#include <linux/nfs4.h>
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#include "nfsd.h"
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#include "blocklayoutxdr.h"
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#define NFSDDBG_FACILITY NFSDDBG_PNFS
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__be32
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nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
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struct nfsd4_layoutget *lgp)
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{
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struct pnfs_block_extent *b = lgp->lg_content;
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int len = sizeof(__be32) + 5 * sizeof(__be64) + sizeof(__be32);
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__be32 *p;
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p = xdr_reserve_space(xdr, sizeof(__be32) + len);
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if (!p)
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return nfserr_toosmall;
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*p++ = cpu_to_be32(len);
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*p++ = cpu_to_be32(1); /* we always return a single extent */
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p = xdr_encode_opaque_fixed(p, &b->vol_id,
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sizeof(struct nfsd4_deviceid));
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p = xdr_encode_hyper(p, b->foff);
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p = xdr_encode_hyper(p, b->len);
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p = xdr_encode_hyper(p, b->soff);
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*p++ = cpu_to_be32(b->es);
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return 0;
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}
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static int
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nfsd4_block_encode_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 len;
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switch (b->type) {
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case PNFS_BLOCK_VOLUME_SIMPLE:
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len = 4 + 4 + 8 + 4 + b->simple.sig_len;
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p = xdr_reserve_space(xdr, len);
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if (!p)
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return -ETOOSMALL;
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*p++ = cpu_to_be32(b->type);
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*p++ = cpu_to_be32(1); /* single signature */
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p = xdr_encode_hyper(p, b->simple.offset);
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p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
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break;
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default:
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return -ENOTSUPP;
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}
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return len;
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}
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__be32
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nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
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struct nfsd4_getdeviceinfo *gdp)
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{
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struct pnfs_block_deviceaddr *dev = gdp->gd_device;
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int len = sizeof(__be32), ret, i;
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__be32 *p;
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p = xdr_reserve_space(xdr, len + sizeof(__be32));
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if (!p)
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return nfserr_resource;
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for (i = 0; i < dev->nr_volumes; i++) {
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ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
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if (ret < 0)
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return nfserrno(ret);
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len += ret;
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}
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/*
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* Fill in the overall length and number of volumes at the beginning
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* of the layout.
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*/
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*p++ = cpu_to_be32(len);
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*p++ = cpu_to_be32(dev->nr_volumes);
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return 0;
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}
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int
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nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
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u32 block_size)
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{
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struct iomap *iomaps;
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u32 nr_iomaps, expected, i;
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if (len < sizeof(u32)) {
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dprintk("%s: extent array too small: %u\n", __func__, len);
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return -EINVAL;
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}
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nr_iomaps = be32_to_cpup(p++);
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expected = sizeof(__be32) + nr_iomaps * NFS4_BLOCK_EXTENT_SIZE;
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if (len != expected) {
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dprintk("%s: extent array size mismatch: %u/%u\n",
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__func__, len, expected);
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return -EINVAL;
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}
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iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
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if (!iomaps) {
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dprintk("%s: failed to allocate extent array\n", __func__);
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return -ENOMEM;
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}
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for (i = 0; i < nr_iomaps; i++) {
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struct pnfs_block_extent bex;
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memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
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p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));
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p = xdr_decode_hyper(p, &bex.foff);
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if (bex.foff & (block_size - 1)) {
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dprintk("%s: unaligned offset %lld\n",
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__func__, bex.foff);
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goto fail;
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}
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p = xdr_decode_hyper(p, &bex.len);
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if (bex.len & (block_size - 1)) {
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dprintk("%s: unaligned length %lld\n",
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__func__, bex.foff);
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goto fail;
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}
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p = xdr_decode_hyper(p, &bex.soff);
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if (bex.soff & (block_size - 1)) {
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dprintk("%s: unaligned disk offset %lld\n",
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__func__, bex.soff);
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goto fail;
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}
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bex.es = be32_to_cpup(p++);
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if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
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dprintk("%s: incorrect extent state %d\n",
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__func__, bex.es);
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goto fail;
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}
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iomaps[i].offset = bex.foff;
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iomaps[i].length = bex.len;
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}
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*iomapp = iomaps;
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return nr_iomaps;
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fail:
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kfree(iomaps);
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return -EINVAL;
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}
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