fs/nfs/nfs3xdr.c

Source file repositories/reference/linux-study-clean/fs/nfs/nfs3xdr.c

File Facts

System
Linux kernel
Corpus path
fs/nfs/nfs3xdr.c
Extension
.c
Size
55502 bytes
Lines
2517
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

*	union set_mode3 switch (bool set_it) {
 *	case TRUE:
 *		mode3	mode;
 *	default:
 *		void;
 *	};
 *
 *	union set_uid3 switch (bool set_it) {
 *	case TRUE:
 *		uid3	uid;
 *	default:
 *		void;
 *	};
 *
 *	union set_gid3 switch (bool set_it) {
 *	case TRUE:
 *		gid3	gid;
 *	default:
 *		void;
 *	};
 *
 *	union set_size3 switch (bool set_it) {
 *	case TRUE:
 *		size3	size;
 *	default:
 *		void;
 *	};
 *
 *	union set_atime switch (time_how set_it) {
 *	case SET_TO_CLIENT_TIME:
 *		nfstime3	atime;
 *	default:
 *		void;
 *	};
 *
 *	union set_mtime switch (time_how set_it) {
 *	case SET_TO_CLIENT_TIME:
 *		nfstime3  mtime;
 *	default:
 *		void;
 *	};
 *
 *	struct sattr3 {
 *		set_mode3	mode;
 *		set_uid3	uid;
 *		set_gid3	gid;
 *		set_size3	size;
 *		set_atime	atime;
 *		set_mtime	mtime;
 *	};
 */
static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr,
		struct user_namespace *userns)
{
	u32 nbytes;
	__be32 *p;

	/*
	 * In order to make only a single xdr_reserve_space() call,
	 * pre-compute the total number of bytes to be reserved.
	 * Six boolean values, one for each set_foo field, are always
	 * present in the encoded result, so start there.
	 */
	nbytes = 6 * 4;
	if (attr->ia_valid & ATTR_MODE)
		nbytes += 4;
	if (attr->ia_valid & ATTR_UID)
		nbytes += 4;
	if (attr->ia_valid & ATTR_GID)
		nbytes += 4;
	if (attr->ia_valid & ATTR_SIZE)
		nbytes += 8;
	if (attr->ia_valid & ATTR_ATIME_SET)
		nbytes += 8;
	if (attr->ia_valid & ATTR_MTIME_SET)
		nbytes += 8;
	p = xdr_reserve_space(xdr, nbytes);

	if (attr->ia_valid & ATTR_MODE) {
		*p++ = xdr_one;
		*p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_UID) {
		*p++ = xdr_one;
		*p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
	} else
		*p++ = xdr_zero;

Annotation

Implementation Notes