[linux-block.git] / io_uring / xattr.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/io_uring.h>
#include <linux/xattr.h>

#include <uapi/linux/io_uring.h>

#include "../fs/internal.h"

#include "io_uring.h"
#include "xattr.h"

struct io_xattr {
	struct file			*file;
	struct xattr_ctx		ctx;
	struct filename			*filename;
};

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

	if (ix->filename)
		putname(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;

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

	ix->filename = NULL;
	ix->ctx.kvalue = NULL;
	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
	ix->ctx.cvalue = 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(sizeof(*ix->ctx.kname), GFP_KERNEL);
	if (!ix->ctx.kname)
		return -ENOMEM;

	ret = strncpy_from_user(ix->ctx.kname->name, name,
				sizeof(ix->ctx.kname->name));
	if (!ret || ret == sizeof(ix->ctx.kname->name))
		ret = -ERANGE;
	if (ret < 0) {
		kfree(ix->ctx.kname);
		return ret;
	}

	req->flags |= REQ_F_NEED_CLEANUP;
	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;

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

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

	ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
	if (IS_ERR(ix->filename)) {
		ret = PTR_ERR(ix->filename);
		ix->filename = NULL;
	}

	return ret;
}

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;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_getxattr(mnt_user_ns(req->file->f_path.mnt),
			req->file->f_path.dentry,
			&ix->ctx);

	io_xattr_finish(req, ret);
	return IOU_OK;
}

int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
	unsigned int lookup_flags = LOOKUP_FOLLOW;
	struct path path;
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

retry:
	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
	if (!ret) {
		ret = do_getxattr(mnt_user_ns(path.mnt),
				path.dentry,
				&ix->ctx);

		path_put(&path);
		if (retry_estale(ret, lookup_flags)) {
			lookup_flags |= LOOKUP_REVAL;
			goto retry;
		}
	}

	io_xattr_finish(req, ret);
	return IOU_OK;
}

static int __io_setxattr_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;

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

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

	ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
	if (!ix->ctx.kname)
		return -ENOMEM;

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

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

int io_setxattr_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;

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

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

	ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
	if (IS_ERR(ix->filename)) {
		ret = PTR_ERR(ix->filename);
		ix->filename = NULL;
	}

	return ret;
}

int io_fsetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	return __io_setxattr_prep(req, sqe);
}

static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags,
			const struct path *path)
{
	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
	int ret;

	ret = mnt_want_write(path->mnt);
	if (!ret) {
		ret = do_setxattr(mnt_user_ns(path->mnt), path->dentry, &ix->ctx);
		mnt_drop_write(path->mnt);
	}

	return ret;
}

int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
{
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = __io_setxattr(req, issue_flags, &req->file->f_path);
	io_xattr_finish(req, ret);
	return IOU_OK;
}

int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
	unsigned int lookup_flags = LOOKUP_FOLLOW;
	struct path path;
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

retry:
	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
	if (!ret) {
		ret = __io_setxattr(req, issue_flags, &path);
		path_put(&path);
		if (retry_estale(ret, lookup_flags)) {
			lookup_flags |= LOOKUP_REVAL;
			goto retry;
		}
	}

	io_xattr_finish(req, ret);
	return IOU_OK;
}
Commit	Line	Data
5e2a18d9 JA	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/kernel.h>
	3	#include <linux/errno.h>
	4	#include <linux/fs.h>
	5	#include <linux/file.h>
	6	#include <linux/mm.h>
	7	#include <linux/slab.h>
	8	#include <linux/namei.h>
	9	#include <linux/io_uring.h>
	10	#include <linux/xattr.h>
	11
	12	#include <uapi/linux/io_uring.h>
	13
	14	#include "../fs/internal.h"
	15
5e2a18d9 JA	16	#include "io_uring.h"
	17	#include "xattr.h"
	18
	19	struct io_xattr {
	20	struct file *file;
	21	struct xattr_ctx ctx;
	22	struct filename *filename;
	23	};
	24
	25	void io_xattr_cleanup(struct io_kiocb *req)
	26	{
f2ccb5ae	27	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	28
	29	if (ix->filename)
	30	putname(ix->filename);
	31
	32	kfree(ix->ctx.kname);
	33	kvfree(ix->ctx.kvalue);
	34	}
	35
	36	static void io_xattr_finish(struct io_kiocb *req, int ret)
	37	{
	38	req->flags &= ~REQ_F_NEED_CLEANUP;
	39
	40	io_xattr_cleanup(req);
	41	io_req_set_res(req, ret, 0);
	42	}
	43
	44	static int __io_getxattr_prep(struct io_kiocb *req,
	45	const struct io_uring_sqe *sqe)
	46	{
f2ccb5ae	47	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	48	const char __user *name;
	49	int ret;
	50
	51	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	52	return -EBADF;
	53
	54	ix->filename = NULL;
	55	ix->ctx.kvalue = NULL;
	56	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
	57	ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	58	ix->ctx.size = READ_ONCE(sqe->len);
	59	ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
	60
	61	if (ix->ctx.flags)
	62	return -EINVAL;
	63
	64	ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
	65	if (!ix->ctx.kname)
	66	return -ENOMEM;
	67
	68	ret = strncpy_from_user(ix->ctx.kname->name, name,
	69	sizeof(ix->ctx.kname->name));
	70	if (!ret \|\| ret == sizeof(ix->ctx.kname->name))
	71	ret = -ERANGE;
	72	if (ret < 0) {
	73	kfree(ix->ctx.kname);
	74	return ret;
	75	}
	76
	77	req->flags \|= REQ_F_NEED_CLEANUP;
	78	return 0;
	79	}
	80
	81	int io_fgetxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	82	{
	83	return __io_getxattr_prep(req, sqe);
	84	}
	85
	86	int io_getxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	87	{
f2ccb5ae	88	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	89	const char __user *path;
	90	int ret;
	91
	92	ret = __io_getxattr_prep(req, sqe);
	93	if (ret)
	94	return ret;
	95
	96	path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
	97
	98	ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
	99	if (IS_ERR(ix->filename)) {
	100	ret = PTR_ERR(ix->filename);
	101	ix->filename = NULL;
	102	}
	103
	104	return ret;
	105	}
	106
	107	int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
	108	{
f2ccb5ae	109	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	110	int ret;
	111
	112	if (issue_flags & IO_URING_F_NONBLOCK)
	113	return -EAGAIN;
	114
	115	ret = do_getxattr(mnt_user_ns(req->file->f_path.mnt),
	116	req->file->f_path.dentry,
	117	&ix->ctx);
	118
	119	io_xattr_finish(req, ret);
	120	return IOU_OK;
	121	}
	122
	123	int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
	124	{
f2ccb5ae	125	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	126	unsigned int lookup_flags = LOOKUP_FOLLOW;
	127	struct path path;
	128	int ret;
	129
	130	if (issue_flags & IO_URING_F_NONBLOCK)
	131	return -EAGAIN;
	132
	133	retry:
	134	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
	135	if (!ret) {
	136	ret = do_getxattr(mnt_user_ns(path.mnt),
	137	path.dentry,
	138	&ix->ctx);
	139
	140	path_put(&path);
	141	if (retry_estale(ret, lookup_flags)) {
	142	lookup_flags \|= LOOKUP_REVAL;
	143	goto retry;
	144	}
	145	}
	146
	147	io_xattr_finish(req, ret);
	148	return IOU_OK;
	149	}
	150
	151	static int __io_setxattr_prep(struct io_kiocb *req,
	152	const struct io_uring_sqe *sqe)
	153	{
f2ccb5ae	154	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	155	const char __user *name;
	156	int ret;
	157
	158	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	159	return -EBADF;
	160
	161	ix->filename = NULL;
	162	name = u64_to_user_ptr(READ_ONCE(sqe->addr));
	163	ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	164	ix->ctx.kvalue = NULL;
	165	ix->ctx.size = READ_ONCE(sqe->len);
	166	ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
	167
	168	ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
	169	if (!ix->ctx.kname)
	170	return -ENOMEM;
	171
	172	ret = setxattr_copy(name, &ix->ctx);
	173	if (ret) {
	174	kfree(ix->ctx.kname);
	175	return ret;
	176	}
	177
	178	req->flags \|= REQ_F_NEED_CLEANUP;
	179	return 0;
	180	}
	181
	182	int io_setxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	183	{
f2ccb5ae	184	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	185	const char __user *path;
	186	int ret;
	187
	188	ret = __io_setxattr_prep(req, sqe);
	189	if (ret)
	190	return ret;
	191
	192	path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
	193
	194	ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
	195	if (IS_ERR(ix->filename)) {
	196	ret = PTR_ERR(ix->filename);
	197	ix->filename = NULL;
	198	}
	199
	200	return ret;
	201	}
	202
	203	int io_fsetxattr_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	204	{
	205	return __io_setxattr_prep(req, sqe);
	206	}
	207
	208	static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags,
e81f574d	209	const struct path *path)
5e2a18d9	210	{
f2ccb5ae	211	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	212	int ret;
	213
	214	ret = mnt_want_write(path->mnt);
	215	if (!ret) {
	216	ret = do_setxattr(mnt_user_ns(path->mnt), path->dentry, &ix->ctx);
	217	mnt_drop_write(path->mnt);
	218	}
	219
	220	return ret;
	221	}
	222
	223	int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
	224	{
	225	int ret;
	226
	227	if (issue_flags & IO_URING_F_NONBLOCK)
	228	return -EAGAIN;
	229
	230	ret = __io_setxattr(req, issue_flags, &req->file->f_path);
	231	io_xattr_finish(req, ret);
	232	return IOU_OK;
	233	}
	234
	235	int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
	236	{
f2ccb5ae	237	struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
5e2a18d9 JA	238	unsigned int lookup_flags = LOOKUP_FOLLOW;
	239	struct path path;
	240	int ret;
	241
	242	if (issue_flags & IO_URING_F_NONBLOCK)
	243	return -EAGAIN;
	244
	245	retry:
	246	ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
	247	if (!ret) {
	248	ret = __io_setxattr(req, issue_flags, &path);
	249	path_put(&path);
	250	if (retry_estale(ret, lookup_flags)) {
	251	lookup_flags \|= LOOKUP_REVAL;
	252	goto retry;
	253	}
	254	}
	255
	256	io_xattr_finish(req, ret);
	257	return IOU_OK;
	258	}