fs/nfs/nfs4xdr.c

Source file repositories/reference/linux-study-clean/fs/nfs/nfs4xdr.c

File Facts

System
Linux kernel
Corpus path
fs/nfs/nfs4xdr.c
Extension
.c
Size
208696 bytes
Lines
7787
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
};

static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
{
	__be32 *p = xdr_reserve_space(xdr, nbytes);
	BUG_ON(!p);
	return p;
}

static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
	WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
}

static void encode_uint32(struct xdr_stream *xdr, u32 n)
{
	WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
}

static void encode_uint64(struct xdr_stream *xdr, u64 n)
{
	WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
}

static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
		const __u32 *bitmap, size_t len)
{
	ssize_t ret;

	/* Trim empty words */
	while (len > 0 && bitmap[len-1] == 0)
		len--;
	ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
	if (WARN_ON_ONCE(ret < 0))
		return ret;
	return len;
}

static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
		__u32 *res, size_t len)
{
	size_t i;
	__u32 tmp;

	while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
		len--;
	for (i = len; i-- > 0;) {
		tmp = bitmap[i] & mask[i];
		res[i] = tmp;
	}
	return len;
}

static void encode_nfs4_seqid(struct xdr_stream *xdr,
		const struct nfs_seqid *seqid)
{
	if (seqid != NULL)
		encode_uint32(xdr, seqid->sequence->counter);
	else
		encode_uint32(xdr, 0);
}

static void encode_compound_hdr(struct xdr_stream *xdr,
				struct rpc_rqst *req,
				struct compound_hdr *hdr)
{
	__be32 *p;

	/* initialize running count of expected bytes in reply.
	 * NOTE: the replied tag SHOULD be the same is the one sent,
	 * but this is not required as a MUST for the server to do so. */
	hdr->replen = 3 + hdr->taglen;

	WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
	encode_string(xdr, hdr->taglen, hdr->tag);
	p = reserve_space(xdr, 8);
	*p++ = cpu_to_be32(hdr->minorversion);
	hdr->nops_p = p;
	*p = cpu_to_be32(hdr->nops);
}

static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,

Annotation

Implementation Notes