diff options
Diffstat (limited to 'fs/nfsd/blocklayoutxdr.c')
| -rw-r--r-- | fs/nfsd/blocklayoutxdr.c | 111 |
1 files changed, 63 insertions, 48 deletions
diff --git a/fs/nfsd/blocklayoutxdr.c b/fs/nfsd/blocklayoutxdr.c index ce78f74715ee..bcf21fde9120 100644 --- a/fs/nfsd/blocklayoutxdr.c +++ b/fs/nfsd/blocklayoutxdr.c @@ -112,35 +112,46 @@ nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr, return 0; } -int +/** + * nfsd4_block_decode_layoutupdate - decode the block layout extent array + * @p: pointer to the xdr data + * @len: number of bytes to decode + * @iomapp: pointer to store the decoded extent array + * @nr_iomapsp: pointer to store the number of extents + * @block_size: alignment of extent offset and length + * + * This function decodes the opaque field of the layoutupdate4 structure + * in a layoutcommit request for the block layout driver. The field is + * actually an array of extents sent by the client. It also checks that + * the file offset, storage offset and length of each extent are aligned + * by @block_size. + * + * Return values: + * %nfs_ok: Successful decoding, @iomapp and @nr_iomapsp are valid + * %nfserr_bad_xdr: The encoded array in @p is invalid + * %nfserr_inval: An unaligned extent found + * %nfserr_delay: Failed to allocate memory for @iomapp + */ +__be32 nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp, - u32 block_size) + int *nr_iomapsp, u32 block_size) { struct iomap *iomaps; u32 nr_iomaps, i; - if (len < sizeof(u32)) { - dprintk("%s: extent array too small: %u\n", __func__, len); - return -EINVAL; - } + if (len < sizeof(u32)) + return nfserr_bad_xdr; len -= sizeof(u32); - if (len % PNFS_BLOCK_EXTENT_SIZE) { - dprintk("%s: extent array invalid: %u\n", __func__, len); - return -EINVAL; - } + if (len % PNFS_BLOCK_EXTENT_SIZE) + return nfserr_bad_xdr; nr_iomaps = be32_to_cpup(p++); - if (nr_iomaps != len / PNFS_BLOCK_EXTENT_SIZE) { - dprintk("%s: extent array size mismatch: %u/%u\n", - __func__, len, nr_iomaps); - return -EINVAL; - } + if (nr_iomaps != len / PNFS_BLOCK_EXTENT_SIZE) + return nfserr_bad_xdr; iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL); - if (!iomaps) { - dprintk("%s: failed to allocate extent array\n", __func__); - return -ENOMEM; - } + if (!iomaps) + return nfserr_delay; for (i = 0; i < nr_iomaps; i++) { struct pnfs_block_extent bex; @@ -150,26 +161,18 @@ nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp, p = xdr_decode_hyper(p, &bex.foff); if (bex.foff & (block_size - 1)) { - dprintk("%s: unaligned offset 0x%llx\n", - __func__, bex.foff); goto fail; } p = xdr_decode_hyper(p, &bex.len); if (bex.len & (block_size - 1)) { - dprintk("%s: unaligned length 0x%llx\n", - __func__, bex.foff); goto fail; } p = xdr_decode_hyper(p, &bex.soff); if (bex.soff & (block_size - 1)) { - dprintk("%s: unaligned disk offset 0x%llx\n", - __func__, bex.soff); goto fail; } bex.es = be32_to_cpup(p++); if (bex.es != PNFS_BLOCK_READWRITE_DATA) { - dprintk("%s: incorrect extent state %d\n", - __func__, bex.es); goto fail; } @@ -178,59 +181,71 @@ nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp, } *iomapp = iomaps; - return nr_iomaps; + *nr_iomapsp = nr_iomaps; + return nfs_ok; fail: kfree(iomaps); - return -EINVAL; + return nfserr_inval; } -int +/** + * nfsd4_scsi_decode_layoutupdate - decode the scsi layout extent array + * @p: pointer to the xdr data + * @len: number of bytes to decode + * @iomapp: pointer to store the decoded extent array + * @nr_iomapsp: pointer to store the number of extents + * @block_size: alignment of extent offset and length + * + * This function decodes the opaque field of the layoutupdate4 structure + * in a layoutcommit request for the scsi layout driver. The field is + * actually an array of extents sent by the client. It also checks that + * the offset and length of each extent are aligned by @block_size. + * + * Return values: + * %nfs_ok: Successful decoding, @iomapp and @nr_iomapsp are valid + * %nfserr_bad_xdr: The encoded array in @p is invalid + * %nfserr_inval: An unaligned extent found + * %nfserr_delay: Failed to allocate memory for @iomapp + */ +__be32 nfsd4_scsi_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp, - u32 block_size) + int *nr_iomapsp, u32 block_size) { struct iomap *iomaps; u32 nr_iomaps, expected, i; - if (len < sizeof(u32)) { - dprintk("%s: extent array too small: %u\n", __func__, len); - return -EINVAL; - } + if (len < sizeof(u32)) + return nfserr_bad_xdr; nr_iomaps = be32_to_cpup(p++); expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE; - if (len != expected) { - dprintk("%s: extent array size mismatch: %u/%u\n", - __func__, len, expected); - return -EINVAL; - } + if (len != expected) + return nfserr_bad_xdr; iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL); - if (!iomaps) { - dprintk("%s: failed to allocate extent array\n", __func__); - return -ENOMEM; - } + if (!iomaps) + return nfserr_delay; for (i = 0; i < nr_iomaps; i++) { u64 val; p = xdr_decode_hyper(p, &val); if (val & (block_size - 1)) { - dprintk("%s: unaligned offset 0x%llx\n", __func__, val); goto fail; } iomaps[i].offset = val; p = xdr_decode_hyper(p, &val); if (val & (block_size - 1)) { - dprintk("%s: unaligned length 0x%llx\n", __func__, val); goto fail; } iomaps[i].length = val; } *iomapp = iomaps; - return nr_iomaps; + *nr_iomapsp = nr_iomaps; + return nfs_ok; fail: kfree(iomaps); - return -EINVAL; + return nfserr_inval; } |