fs/fuse/xattr.c

Source file repositories/reference/linux-study-clean/fs/fuse/xattr.c

File Facts

System
Linux kernel
Corpus path
fs/fuse/xattr.c
Extension
.c
Size
5051 bytes
Lines
215
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

// SPDX-License-Identifier: GPL-2.0
/*
 * FUSE: Filesystem in Userspace
 * Copyright (C) 2001-2016  Miklos Szeredi <miklos@szeredi.hu>
 */

#include "fuse_i.h"

#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>

int fuse_setxattr(struct inode *inode, const char *name, const void *value,
		  size_t size, int flags, unsigned int extra_flags)
{
	struct fuse_mount *fm = get_fuse_mount(inode);
	FUSE_ARGS(args);
	struct fuse_setxattr_in inarg;
	int err;

	if (fm->fc->no_setxattr)
		return -EOPNOTSUPP;

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	inarg.flags = flags;
	inarg.setxattr_flags = extra_flags;

	args.opcode = FUSE_SETXATTR;
	args.nodeid = get_node_id(inode);
	args.in_numargs = 3;
	args.in_args[0].size = fm->fc->setxattr_ext ?
		sizeof(inarg) : FUSE_COMPAT_SETXATTR_IN_SIZE;
	args.in_args[0].value = &inarg;
	args.in_args[1].size = strlen(name) + 1;
	args.in_args[1].value = name;
	args.in_args[2].size = size;
	args.in_args[2].value = value;
	err = fuse_simple_request(fm, &args);
	if (err == -ENOSYS) {
		fm->fc->no_setxattr = 1;
		err = -EOPNOTSUPP;
	}
	if (!err)
		fuse_update_ctime(inode);

	return err;
}

ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
		      size_t size)
{
	struct fuse_mount *fm = get_fuse_mount(inode);
	FUSE_ARGS(args);
	struct fuse_getxattr_in inarg;
	struct fuse_getxattr_out outarg;
	ssize_t ret;

	if (fm->fc->no_getxattr)
		return -EOPNOTSUPP;

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	args.opcode = FUSE_GETXATTR;
	args.nodeid = get_node_id(inode);
	args.in_numargs = 2;
	args.in_args[0].size = sizeof(inarg);
	args.in_args[0].value = &inarg;
	args.in_args[1].size = strlen(name) + 1;
	args.in_args[1].value = name;
	/* This is really two different operations rolled into one */
	args.out_numargs = 1;
	if (size) {
		args.out_argvar = true;
		args.out_args[0].size = size;
		args.out_args[0].value = value;
	} else {
		args.out_args[0].size = sizeof(outarg);
		args.out_args[0].value = &outarg;
	}
	ret = fuse_simple_request(fm, &args);
	if (!ret && !size)
		ret = min_t(size_t, outarg.size, XATTR_SIZE_MAX);
	if (ret == -ENOSYS) {
		fm->fc->no_getxattr = 1;
		ret = -EOPNOTSUPP;
	}
	return ret;
}

static int fuse_verify_xattr_list(char *list, size_t size)

Annotation

Implementation Notes