nfs4xdr.c

linux 内核源代码

				decode_getattr_maxsz)
#define NFS4_enc_getacl_sz	(compound_encode_hdr_maxsz + \
				encode_putfh_maxsz + \
				encode_getacl_maxsz)
#define NFS4_dec_getacl_sz	(compound_decode_hdr_maxsz + \
				decode_putfh_maxsz + \
				decode_getacl_maxsz)
#define NFS4_enc_setacl_sz	(compound_encode_hdr_maxsz + \
				encode_putfh_maxsz + \
				encode_setacl_maxsz)
#define NFS4_dec_setacl_sz	(compound_decode_hdr_maxsz + \
				decode_putfh_maxsz + \
				decode_setacl_maxsz)
#define NFS4_enc_fs_locations_sz \
				(compound_encode_hdr_maxsz + \
				 encode_putfh_maxsz + \
				 encode_lookup_maxsz + \
				 encode_fs_locations_maxsz)
#define NFS4_dec_fs_locations_sz \
				(compound_decode_hdr_maxsz + \
				 decode_putfh_maxsz + \
				 decode_lookup_maxsz + \
				 decode_fs_locations_maxsz)

static struct {
	unsigned int	mode;
	unsigned int	nfs2type;
} nfs_type2fmt[] = {
	{ 0,		NFNON	     },
	{ S_IFREG,	NFREG	     },
	{ S_IFDIR,	NFDIR	     },
	{ S_IFBLK,	NFBLK	     },
	{ S_IFCHR,	NFCHR	     },
	{ S_IFLNK,	NFLNK	     },
	{ S_IFSOCK,	NFSOCK	     },
	{ S_IFIFO,	NFFIFO	     },
	{ 0,		NFNON	     },
	{ 0,		NFNON	     },
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	uint32_t	taglen;
	char *		tag;
};

/*
 * START OF "GENERIC" ENCODE ROUTINES.
 *   These may look a little ugly since they are imported from a "generic"
 * set of XDR encode/decode routines which are intended to be shared by
 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 *
 * If the pain of reading these is too great, it should be a straightforward
 * task to translate them into Linux-specific versions which are more
 * consistent with the style used in NFSv2/v3...
 */
#define WRITE32(n)               *p++ = htonl(n)
#define WRITE64(n)               do {				\
	*p++ = htonl((uint32_t)((n) >> 32));				\
	*p++ = htonl((uint32_t)(n));					\
} while (0)
#define WRITEMEM(ptr,nbytes)     do {				\
	p = xdr_encode_opaque_fixed(p, ptr, nbytes);		\
} while (0)

#define RESERVE_SPACE(nbytes)	do {				\
	p = xdr_reserve_space(xdr, nbytes);			\
	BUG_ON(!p);						\
} while (0)

static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, 4 + len);
	BUG_ON(p == NULL);
	xdr_encode_opaque(p, str, len);
}

static int encode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	__be32 *p;

	dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
	BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
	RESERVE_SPACE(12+(XDR_QUADLEN(hdr->taglen)<<2));
	WRITE32(hdr->taglen);
	WRITEMEM(hdr->tag, hdr->taglen);
	WRITE32(NFS4_MINOR_VERSION);
	WRITE32(hdr->nops);
	return 0;
}

static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
	BUG_ON(p == NULL);
	xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
}

static int encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
{
	char owner_name[IDMAP_NAMESZ];
	char owner_group[IDMAP_NAMESZ];
	int owner_namelen = 0;
	int owner_grouplen = 0;
	__be32 *p;
	__be32 *q;
	int len;
	uint32_t bmval0 = 0;
	uint32_t bmval1 = 0;
	int status;

	/*
	 * We reserve enough space to write the entire attribute buffer at once.
	 * In the worst-case, this would be
	 *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
	 *          = 36 bytes, plus any contribution from variable-length fields
	 *            such as owner/group.
	 */
	len = 16;

	/* Sigh */
	if (iap->ia_valid & ATTR_SIZE)
		len += 8;
	if (iap->ia_valid & ATTR_MODE)
		len += 4;
	if (iap->ia_valid & ATTR_UID) {
		owner_namelen = nfs_map_uid_to_name(server->nfs_client, iap->ia_uid, owner_name);
		if (owner_namelen < 0) {
			dprintk("nfs: couldn't resolve uid %d to string\n",
					iap->ia_uid);
			/* XXX */
			strcpy(owner_name, "nobody");
			owner_namelen = sizeof("nobody") - 1;
			/* goto out; */
		}
		len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
	}
	if (iap->ia_valid & ATTR_GID) {
		owner_grouplen = nfs_map_gid_to_group(server->nfs_client, iap->ia_gid, owner_group);
		if (owner_grouplen < 0) {
			dprintk("nfs: couldn't resolve gid %d to string\n",
					iap->ia_gid);
			strcpy(owner_group, "nobody");
			owner_grouplen = sizeof("nobody") - 1;
			/* goto out; */
		}
		len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
	}
	if (iap->ia_valid & ATTR_ATIME_SET)
		len += 16;
	else if (iap->ia_valid & ATTR_ATIME)
		len += 4;
	if (iap->ia_valid & ATTR_MTIME_SET)
		len += 16;
	else if (iap->ia_valid & ATTR_MTIME)
		len += 4;
	RESERVE_SPACE(len);

	/*
	 * We write the bitmap length now, but leave the bitmap and the attribute
	 * buffer length to be backfilled at the end of this routine.
	 */
	WRITE32(2);
	q = p;
	p += 3;

	if (iap->ia_valid & ATTR_SIZE) {
		bmval0 |= FATTR4_WORD0_SIZE;
		WRITE64(iap->ia_size);
	}
	if (iap->ia_valid & ATTR_MODE) {
		bmval1 |= FATTR4_WORD1_MODE;
		WRITE32(iap->ia_mode & S_IALLUGO);
	}
	if (iap->ia_valid & ATTR_UID) {
		bmval1 |= FATTR4_WORD1_OWNER;
		WRITE32(owner_namelen);
		WRITEMEM(owner_name, owner_namelen);
	}
	if (iap->ia_valid & ATTR_GID) {
		bmval1 |= FATTR4_WORD1_OWNER_GROUP;
		WRITE32(owner_grouplen);
		WRITEMEM(owner_group, owner_grouplen);
	}
	if (iap->ia_valid & ATTR_ATIME_SET) {
		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
		WRITE32(NFS4_SET_TO_CLIENT_TIME);
		WRITE32(0);
		WRITE32(iap->ia_mtime.tv_sec);
		WRITE32(iap->ia_mtime.tv_nsec);
	}
	else if (iap->ia_valid & ATTR_ATIME) {
		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
		WRITE32(NFS4_SET_TO_SERVER_TIME);
	}
	if (iap->ia_valid & ATTR_MTIME_SET) {
		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
		WRITE32(NFS4_SET_TO_CLIENT_TIME);
		WRITE32(0);
		WRITE32(iap->ia_mtime.tv_sec);
		WRITE32(iap->ia_mtime.tv_nsec);
	}
	else if (iap->ia_valid & ATTR_MTIME) {
		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
		WRITE32(NFS4_SET_TO_SERVER_TIME);
	}
	
	/*
	 * Now we backfill the bitmap and the attribute buffer length.
	 */
	if (len != ((char *)p - (char *)q) + 4) {
		printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
				len, ((char *)p - (char *)q) + 4);
		BUG();
	}
	len = (char *)p - (char *)q - 12;
	*q++ = htonl(bmval0);
	*q++ = htonl(bmval1);
	*q++ = htonl(len);

	status = 0;
/* out: */
	return status;
}

static int encode_access(struct xdr_stream *xdr, u32 access)
{
	__be32 *p;

	RESERVE_SPACE(8);
	WRITE32(OP_ACCESS);
	WRITE32(access);
	
	return 0;
}

static int encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg)
{
	__be32 *p;

	RESERVE_SPACE(8+NFS4_STATEID_SIZE);
	WRITE32(OP_CLOSE);
	WRITE32(arg->seqid->sequence->counter);
	WRITEMEM(arg->stateid->data, NFS4_STATEID_SIZE);
	
	return 0;
}

static int encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args)
{
	__be32 *p;
        
        RESERVE_SPACE(16);
        WRITE32(OP_COMMIT);
        WRITE64(args->offset);
        WRITE32(args->count);

        return 0;
}

static int encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create)
{
	__be32 *p;
	
	RESERVE_SPACE(8);
	WRITE32(OP_CREATE);
	WRITE32(create->ftype);

	switch (create->ftype) {
	case NF4LNK:
		RESERVE_SPACE(4);
		WRITE32(create->u.symlink.len);
		xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
		break;

	case NF4BLK: case NF4CHR:
		RESERVE_SPACE(8);
		WRITE32(create->u.device.specdata1);
		WRITE32(create->u.device.specdata2);
		break;

	default:
		break;
	}

	RESERVE_SPACE(4 + create->name->len);
	WRITE32(create->name->len);
	WRITEMEM(create->name->name, create->name->len);

	return encode_attrs(xdr, create->attrs, create->server);
}

static int encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap)
{
        __be32 *p;

        RESERVE_SPACE(12);
        WRITE32(OP_GETATTR);
        WRITE32(1);
        WRITE32(bitmap);
        return 0;
}

static int encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1)
{
        __be32 *p;

        RESERVE_SPACE(16);
        WRITE32(OP_GETATTR);
        WRITE32(2);
        WRITE32(bm0);
        WRITE32(bm1);
        return 0;
}

static int encode_getfattr(struct xdr_stream *xdr, const u32* bitmask)
{
	return encode_getattr_two(xdr,
			bitmask[0] & nfs4_fattr_bitmap[0],
			bitmask[1] & nfs4_fattr_bitmap[1]);
}

static int encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask)
{
	return encode_getattr_two(xdr, bitmask[0] & nfs4_fsinfo_bitmap[0],
			bitmask[1] & nfs4_fsinfo_bitmap[1]);
}

static int encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask)
{
	return encode_getattr_two(xdr,
				  bitmask[0] & nfs4_fs_locations_bitmap[0],
				  bitmask[1] & nfs4_fs_locations_bitmap[1]);
}

static int encode_getfh(struct xdr_stream *xdr)
{
	__be32 *p;

	RESERVE_SPACE(4);
	WRITE32(OP_GETFH);

	return 0;
}

static int encode_link(struct xdr_stream *xdr, const struct qstr *name)
{
	__be32 *p;

	RESERVE_SPACE(8 + name->len);
	WRITE32(OP_LINK);
	WRITE32(name->len);
	WRITEMEM(name->name, name->len);
	
	return 0;
}

static inline int nfs4_lock_type(struct file_lock *fl, int block)
{
	if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
		return block ? NFS4_READW_LT : NFS4_READ_LT;
	return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
}

static inline uint64_t nfs4_lock_length(struct file_lock *fl)
{
	if (fl->fl_end == OFFSET_MAX)
		return ~(uint64_t)0;
	return fl->fl_end - fl->fl_start + 1;
}

/*
 * opcode,type,reclaim,offset,length,new_lock_owner = 32
 * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
 */
static int encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args)
{
	__be32 *p;

	RESERVE_SPACE(32);
	WRITE32(OP_LOCK);
	WRITE32(nfs4_lock_type(args->fl, args->block));
	WRITE32(args->reclaim);
	WRITE64(args->fl->fl_start);
	WRITE64(nfs4_lock_length(args->fl));
	WRITE32(args->new_lock_owner);
	if (args->new_lock_owner){
		RESERVE_SPACE(4+NFS4_STATEID_SIZE+32);
		WRITE32(args->open_seqid->sequence->counter);
		WRITEMEM(args->open_stateid->data, NFS4_STATEID_SIZE);
		WRITE32(args->lock_seqid->sequence->counter);
		WRITE64(args->lock_owner.clientid);
		WRITE32(16);
		WRITEMEM("lock id:", 8);
		WRITE64(args->lock_owner.id);
	}
	else {
		RESERVE_SPACE(NFS4_STATEID_SIZE+4);
		WRITEMEM(args->lock_stateid->data, NFS4_STATEID_SIZE);
		WRITE32(args->lock_seqid->sequence->counter);
	}

	return 0;
}

static int encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args)
{
	__be32 *p;

	RESERVE_SPACE(52);
	WRITE32(OP_LOCKT);
	WRITE32(nfs4_lock_type(args->fl, 0));
	WRITE64(args->fl->fl_start);
	WRITE64(nfs4_lock_length(args->fl));
	WRITE64(args->lock_owner.clientid);
	WRITE32(16);
	WRITEMEM("lock id:", 8);
	WRITE64(args->lock_owner.id);

	return 0;
}

static int encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args)
{
	__be32 *p;

	RESERVE_SPACE(12+NFS4_STATEID_SIZE+16);
	WRITE32(OP_LOCKU);
	WRITE32(nfs4_lock_type(args->fl, 0));
	WRITE32(args->seqid->sequence->counter);
	WRITEMEM(args->stateid->data, NFS4_STATEID_SIZE);
	WRITE64(args->fl->fl_start);
	WRITE64(nfs4_lock_length(args->fl));

	return 0;
}

static int encode_lookup(struct xdr_stream *xdr, const struct qstr *name)
{
	int len = name->len;
	__be32 *p;

	RESERVE_SPACE(8 + len);
	WRITE32(OP_LOOKUP);
	WRITE32(len);
	WRITEMEM(name->name, len);

	return 0;
}

static void encode_share_access(struct xdr_stream *xdr, int open_flags)
{
	__be32 *p;

	RESERVE_SPACE(8);
	switch (open_flags & (FMODE_READ|FMODE_WRITE)) {
		case FMODE_READ:
			WRITE32(NFS4_SHARE_ACCESS_READ);
			break;
		case FMODE_WRITE:
			WRITE32(NFS4_SHARE_ACCESS_WRITE);
			break;
		case FMODE_READ|FMODE_WRITE:
			WRITE32(NFS4_SHARE_ACCESS_BOTH);
			break;
		default:
			BUG();
	}
	WRITE32(0);		/* for linux, share_deny = 0 always */
}

static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
	__be32 *p;
 /*
 * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
 * owner 4 = 32
 */
	RESERVE_SPACE(8);
	WRITE32(OP_OPEN);
	WRITE32(arg->seqid->sequence->counter);
	encode_share_access(xdr, arg->open_flags);
	RESERVE_SPACE(28);
	WRITE64(arg->clientid);
	WRITE32(16);
	WRITEMEM("open id:", 8);
	WRITE64(arg->id);
}

static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
	__be32 *p;