io_uring/xattr.c

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

File Facts

System
Linux kernel
Corpus path
io_uring/xattr.c
Extension
.c
Size
4629 bytes
Lines
198
Domain
Kernel Services
Bucket
io_uring
Inferred role
Kernel Services: implementation source
Status
source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

struct io_xattr {
	struct file			*file;
	struct kernel_xattr_ctx		ctx;
	struct delayed_filename		filename;
};

void io_xattr_cleanup(struct io_kiocb *req)
{
	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);

	dismiss_delayed_filename(&ix->filename);
	kfree(ix->ctx.kname);
	kvfree(ix->ctx.kvalue);
}

static void io_xattr_finish(struct io_kiocb *req, int ret)
{
	req->flags &= ~REQ_F_NEED_CLEANUP;

	io_xattr_cleanup(req);
	io_req_set_res(req, ret, 0);
}

static int __io_getxattr_prep(struct io_kiocb *req,
			      const struct io_uring_sqe *sqe)
{
	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
	const char __user *name;
	int ret;

	INIT_DELAYED_FILENAME(&ix->filename);
	ix->ctx.kvalue = NULL;
	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
	ix->ctx.value = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	ix->ctx.size = READ_ONCE(sqe->len);
	ix->ctx.flags = READ_ONCE(sqe->xattr_flags);

	if (ix->ctx.flags)
		return -EINVAL;

	ix->ctx.kname = kmalloc_obj(*ix->ctx.kname);
	if (!ix->ctx.kname)
		return -ENOMEM;

	ret = import_xattr_name(ix->ctx.kname, name);
	if (ret) {
		kfree(ix->ctx.kname);
		return ret;
	}

	req->flags |= REQ_F_NEED_CLEANUP;
	req->flags |= REQ_F_FORCE_ASYNC;
	return 0;
}

int io_fgetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	return __io_getxattr_prep(req, sqe);
}

int io_getxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
	const char __user *path;
	int ret;

	if (unlikely(req->flags & REQ_F_FIXED_FILE))
		return -EBADF;

	ret = __io_getxattr_prep(req, sqe);
	if (ret)
		return ret;

	path = u64_to_user_ptr(READ_ONCE(sqe->addr3));

	return delayed_getname(&ix->filename, path);
}

int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
	int ret;

	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);

	ret = file_getxattr(req->file, &ix->ctx);
	io_xattr_finish(req, ret);
	return IOU_COMPLETE;
}

Annotation

Implementation Notes