[linux-block.git] / io_uring / fs.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 <uapi/linux/io_uring.h>

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

#include "io_uring.h"
#include "fs.h"

struct io_rename {
	struct file			*file;
	int				old_dfd;
	int				new_dfd;
	struct filename			*oldpath;
	struct filename			*newpath;
	int				flags;
};

struct io_unlink {
	struct file			*file;
	int				dfd;
	int				flags;
	struct filename			*filename;
};

struct io_mkdir {
	struct file			*file;
	int				dfd;
	umode_t				mode;
	struct filename			*filename;
};

struct io_link {
	struct file			*file;
	int				old_dfd;
	int				new_dfd;
	struct filename			*oldpath;
	struct filename			*newpath;
	int				flags;
};

int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
	const char __user *oldf, *newf;

	if (sqe->buf_index || sqe->splice_fd_in)
		return -EINVAL;
	if (unlikely(req->flags & REQ_F_FIXED_FILE))
		return -EBADF;

	ren->old_dfd = READ_ONCE(sqe->fd);
	oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
	newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	ren->new_dfd = READ_ONCE(sqe->len);
	ren->flags = READ_ONCE(sqe->rename_flags);

	ren->oldpath = getname(oldf);
	if (IS_ERR(ren->oldpath))
		return PTR_ERR(ren->oldpath);

	ren->newpath = getname(newf);
	if (IS_ERR(ren->newpath)) {
		putname(ren->oldpath);
		return PTR_ERR(ren->newpath);
	}

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

int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
				ren->newpath, ren->flags);

	req->flags &= ~REQ_F_NEED_CLEANUP;
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

void io_renameat_cleanup(struct io_kiocb *req)
{
	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);

	putname(ren->oldpath);
	putname(ren->newpath);
}

int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
	const char __user *fname;

	if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in)
		return -EINVAL;
	if (unlikely(req->flags & REQ_F_FIXED_FILE))
		return -EBADF;

	un->dfd = READ_ONCE(sqe->fd);

	un->flags = READ_ONCE(sqe->unlink_flags);
	if (un->flags & ~AT_REMOVEDIR)
		return -EINVAL;

	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
	un->filename = getname(fname);
	if (IS_ERR(un->filename))
		return PTR_ERR(un->filename);

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

int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	if (un->flags & AT_REMOVEDIR)
		ret = do_rmdir(un->dfd, un->filename);
	else
		ret = do_unlinkat(un->dfd, un->filename);

	req->flags &= ~REQ_F_NEED_CLEANUP;
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

void io_unlinkat_cleanup(struct io_kiocb *req)
{
	struct io_unlink *ul = io_kiocb_to_cmd(req, struct io_unlink);

	putname(ul->filename);
}

int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
	const char __user *fname;

	if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
		return -EINVAL;
	if (unlikely(req->flags & REQ_F_FIXED_FILE))
		return -EBADF;

	mkd->dfd = READ_ONCE(sqe->fd);
	mkd->mode = READ_ONCE(sqe->len);

	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
	mkd->filename = getname(fname);
	if (IS_ERR(mkd->filename))
		return PTR_ERR(mkd->filename);

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

int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);

	req->flags &= ~REQ_F_NEED_CLEANUP;
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

void io_mkdirat_cleanup(struct io_kiocb *req)
{
	struct io_mkdir *md = io_kiocb_to_cmd(req, struct io_mkdir);

	putname(md->filename);
}

int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
	const char __user *oldpath, *newpath;

	if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
		return -EINVAL;
	if (unlikely(req->flags & REQ_F_FIXED_FILE))
		return -EBADF;

	sl->new_dfd = READ_ONCE(sqe->fd);
	oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr));
	newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2));

	sl->oldpath = getname(oldpath);
	if (IS_ERR(sl->oldpath))
		return PTR_ERR(sl->oldpath);

	sl->newpath = getname(newpath);
	if (IS_ERR(sl->newpath)) {
		putname(sl->oldpath);
		return PTR_ERR(sl->newpath);
	}

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

int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);

	req->flags &= ~REQ_F_NEED_CLEANUP;
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
	const char __user *oldf, *newf;

	if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
		return -EINVAL;
	if (unlikely(req->flags & REQ_F_FIXED_FILE))
		return -EBADF;

	lnk->old_dfd = READ_ONCE(sqe->fd);
	lnk->new_dfd = READ_ONCE(sqe->len);
	oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
	newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	lnk->flags = READ_ONCE(sqe->hardlink_flags);

	lnk->oldpath = getname(oldf);
	if (IS_ERR(lnk->oldpath))
		return PTR_ERR(lnk->oldpath);

	lnk->newpath = getname(newf);
	if (IS_ERR(lnk->newpath)) {
		putname(lnk->oldpath);
		return PTR_ERR(lnk->newpath);
	}

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

int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
				lnk->newpath, lnk->flags);

	req->flags &= ~REQ_F_NEED_CLEANUP;
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

void io_link_cleanup(struct io_kiocb *req)
{
	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);

	putname(sl->oldpath);
	putname(sl->newpath);
}
Commit	Line	Data
11aeb714 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
	11	#include <uapi/linux/io_uring.h>
	12
	13	#include "../fs/internal.h"
	14
11aeb714 JA	15	#include "io_uring.h"
	16	#include "fs.h"
	17
	18	struct io_rename {
	19	struct file *file;
	20	int old_dfd;
	21	int new_dfd;
	22	struct filename *oldpath;
	23	struct filename *newpath;
	24	int flags;
	25	};
	26
	27	struct io_unlink {
	28	struct file *file;
	29	int dfd;
	30	int flags;
	31	struct filename *filename;
	32	};
	33
	34	struct io_mkdir {
	35	struct file *file;
	36	int dfd;
	37	umode_t mode;
	38	struct filename *filename;
	39	};
	40
	41	struct io_link {
	42	struct file *file;
	43	int old_dfd;
	44	int new_dfd;
	45	struct filename *oldpath;
	46	struct filename *newpath;
	47	int flags;
	48	};
	49
	50	int io_renameat_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	51	{
f2ccb5ae	52	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
11aeb714 JA	53	const char __user oldf, newf;
	54
	55	if (sqe->buf_index \|\| sqe->splice_fd_in)
	56	return -EINVAL;
	57	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	58	return -EBADF;
	59
	60	ren->old_dfd = READ_ONCE(sqe->fd);
	61	oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
	62	newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	63	ren->new_dfd = READ_ONCE(sqe->len);
	64	ren->flags = READ_ONCE(sqe->rename_flags);
	65
	66	ren->oldpath = getname(oldf);
	67	if (IS_ERR(ren->oldpath))
	68	return PTR_ERR(ren->oldpath);
	69
	70	ren->newpath = getname(newf);
	71	if (IS_ERR(ren->newpath)) {
	72	putname(ren->oldpath);
	73	return PTR_ERR(ren->newpath);
	74	}
	75
	76	req->flags \|= REQ_F_NEED_CLEANUP;
	77	return 0;
	78	}
	79
	80	int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
	81	{
f2ccb5ae	82	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
11aeb714 JA	83	int ret;
	84
	85	if (issue_flags & IO_URING_F_NONBLOCK)
	86	return -EAGAIN;
	87
	88	ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
	89	ren->newpath, ren->flags);
	90
	91	req->flags &= ~REQ_F_NEED_CLEANUP;
	92	io_req_set_res(req, ret, 0);
	93	return IOU_OK;
	94	}
	95
	96	void io_renameat_cleanup(struct io_kiocb *req)
	97	{
f2ccb5ae	98	struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
11aeb714 JA	99
	100	putname(ren->oldpath);
	101	putname(ren->newpath);
	102	}
	103
	104	int io_unlinkat_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	105	{
f2ccb5ae	106	struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
11aeb714 JA	107	const char __user *fname;
	108
	109	if (sqe->off \|\| sqe->len \|\| sqe->buf_index \|\| sqe->splice_fd_in)
	110	return -EINVAL;
	111	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	112	return -EBADF;
	113
	114	un->dfd = READ_ONCE(sqe->fd);
	115
	116	un->flags = READ_ONCE(sqe->unlink_flags);
	117	if (un->flags & ~AT_REMOVEDIR)
	118	return -EINVAL;
	119
	120	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
	121	un->filename = getname(fname);
	122	if (IS_ERR(un->filename))
	123	return PTR_ERR(un->filename);
	124
	125	req->flags \|= REQ_F_NEED_CLEANUP;
	126	return 0;
	127	}
	128
	129	int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
	130	{
f2ccb5ae	131	struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
11aeb714 JA	132	int ret;
	133
	134	if (issue_flags & IO_URING_F_NONBLOCK)
	135	return -EAGAIN;
	136
	137	if (un->flags & AT_REMOVEDIR)
	138	ret = do_rmdir(un->dfd, un->filename);
	139	else
	140	ret = do_unlinkat(un->dfd, un->filename);
	141
	142	req->flags &= ~REQ_F_NEED_CLEANUP;
	143	io_req_set_res(req, ret, 0);
	144	return IOU_OK;
	145	}
	146
	147	void io_unlinkat_cleanup(struct io_kiocb *req)
	148	{
f2ccb5ae	149	struct io_unlink *ul = io_kiocb_to_cmd(req, struct io_unlink);
11aeb714 JA	150
	151	putname(ul->filename);
	152	}
	153
	154	int io_mkdirat_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	155	{
f2ccb5ae	156	struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
11aeb714 JA	157	const char __user *fname;
	158
	159	if (sqe->off \|\| sqe->rw_flags \|\| sqe->buf_index \|\| sqe->splice_fd_in)
	160	return -EINVAL;
	161	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	162	return -EBADF;
	163
	164	mkd->dfd = READ_ONCE(sqe->fd);
	165	mkd->mode = READ_ONCE(sqe->len);
	166
	167	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
	168	mkd->filename = getname(fname);
	169	if (IS_ERR(mkd->filename))
	170	return PTR_ERR(mkd->filename);
	171
	172	req->flags \|= REQ_F_NEED_CLEANUP;
	173	return 0;
	174	}
	175
	176	int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
	177	{
f2ccb5ae	178	struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
11aeb714 JA	179	int ret;
	180
	181	if (issue_flags & IO_URING_F_NONBLOCK)
	182	return -EAGAIN;
	183
	184	ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);
	185
	186	req->flags &= ~REQ_F_NEED_CLEANUP;
	187	io_req_set_res(req, ret, 0);
	188	return IOU_OK;
	189	}
	190
	191	void io_mkdirat_cleanup(struct io_kiocb *req)
	192	{
f2ccb5ae	193	struct io_mkdir *md = io_kiocb_to_cmd(req, struct io_mkdir);
11aeb714 JA	194
	195	putname(md->filename);
	196	}
	197
	198	int io_symlinkat_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	199	{
f2ccb5ae	200	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
11aeb714 JA	201	const char __user oldpath, newpath;
	202
	203	if (sqe->len \|\| sqe->rw_flags \|\| sqe->buf_index \|\| sqe->splice_fd_in)
	204	return -EINVAL;
	205	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	206	return -EBADF;
	207
	208	sl->new_dfd = READ_ONCE(sqe->fd);
	209	oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr));
	210	newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	211
	212	sl->oldpath = getname(oldpath);
	213	if (IS_ERR(sl->oldpath))
	214	return PTR_ERR(sl->oldpath);
	215
	216	sl->newpath = getname(newpath);
	217	if (IS_ERR(sl->newpath)) {
	218	putname(sl->oldpath);
	219	return PTR_ERR(sl->newpath);
	220	}
	221
	222	req->flags \|= REQ_F_NEED_CLEANUP;
	223	return 0;
	224	}
	225
	226	int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
	227	{
f2ccb5ae	228	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
11aeb714 JA	229	int ret;
	230
	231	if (issue_flags & IO_URING_F_NONBLOCK)
	232	return -EAGAIN;
	233
	234	ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
	235
	236	req->flags &= ~REQ_F_NEED_CLEANUP;
	237	io_req_set_res(req, ret, 0);
	238	return IOU_OK;
	239	}
	240
	241	int io_linkat_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	242	{
f2ccb5ae	243	struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
11aeb714 JA	244	const char __user oldf, newf;
	245
	246	if (sqe->rw_flags \|\| sqe->buf_index \|\| sqe->splice_fd_in)
	247	return -EINVAL;
	248	if (unlikely(req->flags & REQ_F_FIXED_FILE))
	249	return -EBADF;
	250
	251	lnk->old_dfd = READ_ONCE(sqe->fd);
	252	lnk->new_dfd = READ_ONCE(sqe->len);
	253	oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
	254	newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
	255	lnk->flags = READ_ONCE(sqe->hardlink_flags);
	256
	257	lnk->oldpath = getname(oldf);
	258	if (IS_ERR(lnk->oldpath))
	259	return PTR_ERR(lnk->oldpath);
	260
	261	lnk->newpath = getname(newf);
	262	if (IS_ERR(lnk->newpath)) {
	263	putname(lnk->oldpath);
	264	return PTR_ERR(lnk->newpath);
	265	}
	266
	267	req->flags \|= REQ_F_NEED_CLEANUP;
	268	return 0;
	269	}
	270
	271	int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
	272	{
f2ccb5ae	273	struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
11aeb714 JA	274	int ret;
	275
	276	if (issue_flags & IO_URING_F_NONBLOCK)
	277	return -EAGAIN;
	278
	279	ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
	280	lnk->newpath, lnk->flags);
	281
	282	req->flags &= ~REQ_F_NEED_CLEANUP;
	283	io_req_set_res(req, ret, 0);
	284	return IOU_OK;
	285	}
	286
	287	void io_link_cleanup(struct io_kiocb *req)
	288	{
f2ccb5ae	289	struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
11aeb714 JA	290
	291	putname(sl->oldpath);
	292	putname(sl->newpath);
	293	}