fs/nfsd/nfs4callback.c

Source file repositories/reference/linux-study-clean/fs/nfsd/nfs4callback.c

File Facts

System
Linux kernel
Corpus path
fs/nfsd/nfs4callback.c
Extension
.c
Size
47608 bytes
Lines
1832
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source 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 nfs4_cb_compound_hdr {
	/* args */
	u32		ident;	/* minorversion 0 only */
	u32		nops;
	__be32		*nops_p;
	u32		minorversion;
	/* res */
	int		status;
};

static __be32 *xdr_encode_empty_array(__be32 *p)
{
	*p++ = xdr_zero;
	return p;
}

/*
 * Encode/decode NFSv4 CB basic data types
 *
 * Basic NFSv4 callback data types are defined in section 15 of RFC
 * 3530: "Network File System (NFS) version 4 Protocol" and section
 * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
 * 1 Protocol"
 */

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

static void encode_bitmap4(struct xdr_stream *xdr, const __u32 *bitmap,
			   size_t len)
{
	xdr_stream_encode_uint32_array(xdr, bitmap, len);
}

static int decode_cb_fattr4(struct xdr_stream *xdr, uint32_t *bitmap,
				struct nfs4_cb_fattr *fattr)
{
	fattr->ncf_cb_change = 0;
	fattr->ncf_cb_fsize = 0;
	fattr->ncf_cb_atime.tv_sec = 0;
	fattr->ncf_cb_atime.tv_nsec = 0;
	fattr->ncf_cb_mtime.tv_sec = 0;
	fattr->ncf_cb_mtime.tv_nsec = 0;

	if (bitmap[0] & FATTR4_WORD0_CHANGE)
		if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_change) < 0)
			return -EIO;
	if (bitmap[0] & FATTR4_WORD0_SIZE)
		if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_fsize) < 0)
			return -EIO;
	if (bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS) {
		fattr4_time_deleg_access access;

		if (!xdrgen_decode_fattr4_time_deleg_access(xdr, &access))
			return -EIO;
		fattr->ncf_cb_atime.tv_sec = access.seconds;
		fattr->ncf_cb_atime.tv_nsec = access.nseconds;

	}
	if (bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY) {
		fattr4_time_deleg_modify modify;

		if (!xdrgen_decode_fattr4_time_deleg_modify(xdr, &modify))
			return -EIO;
		fattr->ncf_cb_mtime.tv_sec = modify.seconds;
		fattr->ncf_cb_mtime.tv_nsec = modify.nseconds;

	}
	return 0;
}

static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, 4);
	*p = cpu_to_be32(op);
}

/*
 * nfs_fh4
 *
 *	typedef opaque nfs_fh4<NFS4_FHSIZE>;
 */
static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
{
	u32 length = fh->fh_size;
	__be32 *p;

Annotation

Implementation Notes