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.
- Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
fuse_i.hlinux/xattr.hlinux/posix_acl_xattr.h
Detected Declarations
function Copyrightfunction fuse_getxattrfunction fuse_verify_xattr_listfunction fuse_listxattrfunction fuse_removexattrfunction fuse_xattr_getfunction fuse_xattr_set
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
- Immediate include surface: `fuse_i.h`, `linux/xattr.h`, `linux/posix_acl_xattr.h`.
- Detected declarations: `function Copyright`, `function fuse_getxattr`, `function fuse_verify_xattr_list`, `function fuse_listxattr`, `function fuse_removexattr`, `function fuse_xattr_get`, `function fuse_xattr_set`.
- Atlas domain: Core OS / VFS And Filesystem Core.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.