io_uring: split out filesystem related operations

This splits out renameat, unlinkat, mkdirat, symlinkat, and linkat.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

4 files changed, 316 insertions, 283 deletions

diff --git a/io_uring/Makefile b/io_uring/Makefile
index 32c02a38f83b..50e68c9a4d1b 100644
--- a/io_uring/Makefile
+++ b/io_uring/Makefile
@@ -2,5 +2,5 @@
 #
 # Makefile for io_uring
 
-obj-$(CONFIG_IO_URING)		+= io_uring.o xattr.o nop.o
+obj-$(CONFIG_IO_URING)		+= io_uring.o xattr.o nop.o fs.o
 obj-$(CONFIG_IO_WQ)		+= io-wq.o
diff --git a/io_uring/fs.c b/io_uring/fs.c
new file mode 100644
index 000000000000..aac1bc5255b0
--- /dev/null
+++ b/io_uring/fs.c
@@ -0,0 +1,294 @@
+// 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_types.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);
+	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);
+	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);
+
+	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);
+	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);
+	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);
+
+	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);
+	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);
+	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);
+
+	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);
+	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);
+	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);
+	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);
+	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);
+
+	putname(sl->oldpath);
+	putname(sl->newpath);
+}
diff --git a/io_uring/fs.h b/io_uring/fs.h
new file mode 100644
index 000000000000..0bb5efe3d6bb
--- /dev/null
+++ b/io_uring/fs.h
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+
+int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+int io_renameat(struct io_kiocb *req, unsigned int issue_flags);
+void io_renameat_cleanup(struct io_kiocb *req);
+
+int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags);
+void io_unlinkat_cleanup(struct io_kiocb *req);
+
+int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags);
+void io_mkdirat_cleanup(struct io_kiocb *req);
+
+int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags);
+
+int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+int io_linkat(struct io_kiocb *req, unsigned int issue_flags);
+void io_link_cleanup(struct io_kiocb *req);
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 3e74925bd4b4..5b1e67ff0faa 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -94,6 +94,7 @@
 
 #include "xattr.h"
 #include "nop.h"
+#include "fs.h"
 
 #define IORING_MAX_ENTRIES	32768
 #define IORING_MAX_CQ_ENTRIES	(2 * IORING_MAX_ENTRIES)
@@ -467,38 +468,6 @@ struct io_shutdown {
 	int				how;
 };
 
-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;
-};
-
 struct io_msg {
 	struct file			*file;
 	u64 user_data;
@@ -3845,256 +3814,6 @@ out_free:
 	return ret;
 }
 
-static int io_renameat_prep(struct io_kiocb *req,
-			    const struct io_uring_sqe *sqe)
-{
-	struct io_rename *ren = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_rename *ren = io_kiocb_to_cmd(req);
-	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;
-}
-
-static void io_renameat_cleanup(struct io_kiocb *req)
-{
-	struct io_rename *ren = io_kiocb_to_cmd(req);
-
-	putname(ren->oldpath);
-	putname(ren->newpath);
-}
-
-static int io_unlinkat_prep(struct io_kiocb *req,
-			    const struct io_uring_sqe *sqe)
-{
-	struct io_unlink *un = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_unlink *un = io_kiocb_to_cmd(req);
-	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;
-}
-
-static void io_unlinkat_cleanup(struct io_kiocb *req)
-{
-	struct io_unlink *ul = io_kiocb_to_cmd(req);
-
-	putname(ul->filename);
-}
-
-static int io_mkdirat_prep(struct io_kiocb *req,
-			    const struct io_uring_sqe *sqe)
-{
-	struct io_mkdir *mkd = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_mkdir *mkd = io_kiocb_to_cmd(req);
-	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;
-}
-
-static void io_mkdirat_cleanup(struct io_kiocb *req)
-{
-	struct io_mkdir *md = io_kiocb_to_cmd(req);
-
-	putname(md->filename);
-}
-
-static int io_symlinkat_prep(struct io_kiocb *req,
-			    const struct io_uring_sqe *sqe)
-{
-	struct io_link *sl = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_link *sl = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_linkat_prep(struct io_kiocb *req,
-			    const struct io_uring_sqe *sqe)
-{
-	struct io_link *lnk = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_link *lnk = io_kiocb_to_cmd(req);
-	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;
-}
-
-static void io_link_cleanup(struct io_kiocb *req)
-{
-	struct io_link *sl = io_kiocb_to_cmd(req);
-
-	putname(sl->oldpath);
-	putname(sl->newpath);
-}
-
 static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
 {
 	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);