NFSv4; Clean up XDR encoding of type bitmap4
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust
Anna Schumaker
Родитель
e8d8aa46be
Коммит
37c88763de
166
fs/nfs/nfs4xdr.c
166
fs/nfs/nfs4xdr.c
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@ -958,6 +958,35 @@ static void encode_uint64(struct xdr_stream *xdr, u64 n)
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WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
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}
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static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
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const __u32 *bitmap, size_t len)
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{
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ssize_t ret;
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/* Trim empty words */
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while (len > 0 && bitmap[len-1] == 0)
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len--;
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ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
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if (WARN_ON_ONCE(ret < 0))
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return ret;
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return len;
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}
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static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
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__u32 *res, size_t len)
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{
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size_t i;
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__u32 tmp;
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while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
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len--;
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for (i = len; i-- > 0;) {
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tmp = bitmap[i] & mask[i];
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res[i] = tmp;
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}
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return len;
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}
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static void encode_nfs4_seqid(struct xdr_stream *xdr,
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const struct nfs_seqid *seqid)
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{
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@ -1200,85 +1229,45 @@ static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *
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create->server, create->server->attr_bitmask);
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}
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static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
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static void encode_getattr(struct xdr_stream *xdr,
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const __u32 *bitmap, const __u32 *mask, size_t len,
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struct compound_hdr *hdr)
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{
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__be32 *p;
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__u32 masked_bitmap[nfs4_fattr_bitmap_maxsz];
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encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
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p = reserve_space(xdr, 8);
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*p++ = cpu_to_be32(1);
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*p = cpu_to_be32(bitmap);
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}
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static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
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{
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__be32 *p;
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encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
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p = reserve_space(xdr, 12);
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*p++ = cpu_to_be32(2);
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*p++ = cpu_to_be32(bm0);
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*p = cpu_to_be32(bm1);
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}
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static void
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encode_getattr_three(struct xdr_stream *xdr,
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uint32_t bm0, uint32_t bm1, uint32_t bm2,
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struct compound_hdr *hdr)
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{
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__be32 *p;
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encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
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if (bm2) {
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p = reserve_space(xdr, 16);
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*p++ = cpu_to_be32(3);
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*p++ = cpu_to_be32(bm0);
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*p++ = cpu_to_be32(bm1);
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*p = cpu_to_be32(bm2);
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} else if (bm1) {
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p = reserve_space(xdr, 12);
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*p++ = cpu_to_be32(2);
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*p++ = cpu_to_be32(bm0);
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*p = cpu_to_be32(bm1);
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} else {
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p = reserve_space(xdr, 8);
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*p++ = cpu_to_be32(1);
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*p = cpu_to_be32(bm0);
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if (mask) {
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if (WARN_ON_ONCE(len > ARRAY_SIZE(masked_bitmap)))
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len = ARRAY_SIZE(masked_bitmap);
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len = mask_bitmap4(bitmap, mask, masked_bitmap, len);
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bitmap = masked_bitmap;
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}
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xdr_encode_bitmap4(xdr, bitmap, len);
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}
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static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
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{
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encode_getattr_three(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
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bitmask[1] & nfs4_fattr_bitmap[1],
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bitmask[2] & nfs4_fattr_bitmap[2],
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hdr);
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encode_getattr(xdr, nfs4_fattr_bitmap, bitmask,
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ARRAY_SIZE(nfs4_fattr_bitmap), hdr);
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}
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static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
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const u32 *open_bitmap,
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struct compound_hdr *hdr)
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{
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encode_getattr_three(xdr,
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bitmask[0] & open_bitmap[0],
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bitmask[1] & open_bitmap[1],
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bitmask[2] & open_bitmap[2],
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hdr);
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encode_getattr(xdr, open_bitmap, bitmask, 3, hdr);
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}
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static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
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{
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encode_getattr_three(xdr,
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bitmask[0] & nfs4_fsinfo_bitmap[0],
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bitmask[1] & nfs4_fsinfo_bitmap[1],
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bitmask[2] & nfs4_fsinfo_bitmap[2],
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hdr);
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encode_getattr(xdr, nfs4_fsinfo_bitmap, bitmask,
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ARRAY_SIZE(nfs4_fsinfo_bitmap), hdr);
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}
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static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
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{
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encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
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bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
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encode_getattr(xdr, nfs4_fs_locations_bitmap, bitmask,
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ARRAY_SIZE(nfs4_fs_locations_bitmap), hdr);
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}
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static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
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@ -2559,13 +2548,17 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
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struct compound_hdr hdr = {
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.minorversion = nfs4_xdr_minorversion(&args->seq_args),
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};
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const __u32 nfs4_acl_bitmap[1] = {
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[0] = FATTR4_WORD0_ACL,
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};
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uint32_t replen;
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encode_compound_hdr(xdr, req, &hdr);
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encode_sequence(xdr, &args->seq_args, &hdr);
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encode_putfh(xdr, args->fh, &hdr);
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replen = hdr.replen + op_decode_hdr_maxsz;
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encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
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encode_getattr(xdr, nfs4_acl_bitmap, NULL,
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ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
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xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
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args->acl_pages, 0, args->acl_len);
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@ -2644,8 +2637,8 @@ static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
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encode_compound_hdr(xdr, req, &hdr);
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encode_sequence(xdr, &args->seq_args, &hdr);
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encode_putfh(xdr, args->fh, &hdr);
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encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
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&hdr);
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encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
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ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
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encode_nops(&hdr);
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}
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@ -2663,8 +2656,8 @@ static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
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encode_compound_hdr(xdr, req, &hdr);
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encode_sequence(xdr, &args->seq_args, &hdr);
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encode_putfh(xdr, args->fh, &hdr);
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encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
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args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
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encode_getattr(xdr, nfs4_statfs_bitmap, args->bitmask,
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ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
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encode_nops(&hdr);
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}
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@ -2684,7 +2677,7 @@ static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
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encode_compound_hdr(xdr, req, &hdr);
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encode_sequence(xdr, &args->seq_args, &hdr);
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encode_putfh(xdr, args->fhandle, &hdr);
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encode_getattr_three(xdr, bitmask[0], bitmask[1], bitmask[2], &hdr);
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encode_getattr(xdr, bitmask, NULL, 3, &hdr);
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encode_nops(&hdr);
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}
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@ -3218,34 +3211,27 @@ static int decode_ace(struct xdr_stream *xdr, void *ace)
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return -EIO;
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}
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static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
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static ssize_t
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decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
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{
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uint32_t bmlen;
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__be32 *p;
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ssize_t ret;
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p = xdr_inline_decode(xdr, 4);
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if (unlikely(!p))
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goto out_overflow;
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bmlen = be32_to_cpup(p);
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bitmap[0] = bitmap[1] = bitmap[2] = 0;
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p = xdr_inline_decode(xdr, (bmlen << 2));
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if (unlikely(!p))
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goto out_overflow;
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if (bmlen > 0) {
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bitmap[0] = be32_to_cpup(p++);
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if (bmlen > 1) {
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bitmap[1] = be32_to_cpup(p++);
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if (bmlen > 2)
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bitmap[2] = be32_to_cpup(p);
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}
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}
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return 0;
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out_overflow:
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ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
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if (likely(ret >= 0))
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return ret;
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if (ret == -EMSGSIZE)
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return sz;
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
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{
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ssize_t ret;
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ret = decode_bitmap4(xdr, bitmap, 3);
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return ret < 0 ? ret : 0;
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}
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static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
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{
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__be32 *p;
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@ -5471,21 +5457,13 @@ decode_savefh(struct xdr_stream *xdr)
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static int decode_setattr(struct xdr_stream *xdr)
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{
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__be32 *p;
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uint32_t bmlen;
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int status;
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status = decode_op_hdr(xdr, OP_SETATTR);
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if (status)
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return status;
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p = xdr_inline_decode(xdr, 4);
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if (unlikely(!p))
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goto out_overflow;
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bmlen = be32_to_cpup(p);
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p = xdr_inline_decode(xdr, bmlen << 2);
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if (likely(p))
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if (decode_bitmap4(xdr, NULL, 0) >= 0)
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return 0;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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@ -386,6 +386,31 @@ xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
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return count;
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}
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/**
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* xdr_stream_encode_uint32_array - Encode variable length array of integers
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* @xdr: pointer to xdr_stream
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* @array: array of integers
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* @array_size: number of elements in @array
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*
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* Return values:
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* On success, returns length in bytes of XDR buffer consumed
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* %-EMSGSIZE on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
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const __u32 *array, size_t array_size)
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{
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ssize_t ret = (array_size+1) * sizeof(__u32);
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__be32 *p = xdr_reserve_space(xdr, ret);
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if (unlikely(!p))
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return -EMSGSIZE;
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*p++ = cpu_to_be32(array_size);
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for (; array_size > 0; p++, array++, array_size--)
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*p = cpu_to_be32p(array);
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return ret;
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}
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/**
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* xdr_stream_decode_u32 - Decode a 32-bit integer
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* @xdr: pointer to xdr_stream
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@ -463,6 +488,44 @@ xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxle
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}
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return len;
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}
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/**
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* xdr_stream_decode_uint32_array - Decode variable length array of integers
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* @xdr: pointer to xdr_stream
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* @array: location to store the integer array or NULL
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* @array_size: number of elements to store
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*
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* Return values:
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* On success, returns number of elements stored in @array
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* %-EBADMSG on XDR buffer overflow
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* %-EMSGSIZE if the size of the array exceeds @array_size
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*/
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static inline ssize_t
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xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
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__u32 *array, size_t array_size)
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{
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__be32 *p;
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__u32 len;
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ssize_t retval;
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if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
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return -EBADMSG;
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p = xdr_inline_decode(xdr, len * sizeof(*p));
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if (unlikely(!p))
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return -EBADMSG;
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if (array == NULL)
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return len;
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if (len <= array_size) {
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if (len < array_size)
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memset(array+len, 0, (array_size-len)*sizeof(*array));
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array_size = len;
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retval = len;
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} else
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retval = -EMSGSIZE;
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for (; array_size > 0; p++, array++, array_size--)
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*array = be32_to_cpup(p);
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return retval;
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}
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#endif /* __KERNEL__ */
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#endif /* _SUNRPC_XDR_H_ */
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