io_uring: move xattr related opcodes to its own file

Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

io_uring/Makefile

@@ -2,5 +2,5 @@
 #
 # Makefile for io_uring
 
-obj-$(CONFIG_IO_URING)		+= io_uring.o
+obj-$(CONFIG_IO_URING)		+= io_uring.o xattr.o
 obj-$(CONFIG_IO_WQ)		+= io-wq.o

io_uring/io_uring.c

@@ -80,7 +80,6 @@
 #include <linux/io_uring.h>
 #include <linux/audit.h>
 #include <linux/security.h>
-#include <linux/xattr.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/io_uring.h>
@@ -93,6 +92,8 @@
 #include "io_uring_types.h"
 #include "io_uring.h"
 
+#include "xattr.h"
+
 #define IORING_MAX_ENTRIES	32768
 #define IORING_MAX_CQ_ENTRIES	(2 * IORING_MAX_ENTRIES)
 #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8
@@ -529,12 +530,6 @@ struct io_async_rw {
 	struct wait_page_queue		wpq;
 };
 
-struct io_xattr {
-	struct file			*file;
-	struct xattr_ctx		ctx;
-	struct filename			*filename;
-};
-
 struct async_poll {
 	struct io_poll		poll;
 	struct io_poll		*double_poll;
@@ -3904,245 +3899,6 @@ static void io_renameat_cleanup(struct io_kiocb *req)
 	putname(ren->newpath);
 }
 
-static inline void io_xattr_cleanup(struct io_kiocb *req)
-{
-	struct io_xattr *ix = io_kiocb_to_cmd(req);
-
-	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);
-	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;
-}
-
-static int io_fgetxattr_prep(struct io_kiocb *req,
-			     const struct io_uring_sqe *sqe)
-{
-	return __io_getxattr_prep(req, sqe);
-}
-
-static int io_getxattr_prep(struct io_kiocb *req,
-			    const struct io_uring_sqe *sqe)
-{
-	struct io_xattr *ix = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_xattr *ix = io_kiocb_to_cmd(req);
-	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;
-}
-
-static int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_xattr *ix = io_kiocb_to_cmd(req);
-	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);
-	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;
-}
-
-static int io_setxattr_prep(struct io_kiocb *req,
-			const struct io_uring_sqe *sqe)
-{
-	struct io_xattr *ix = io_kiocb_to_cmd(req);
-	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;
-}
-
-static 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,
-			struct path *path)
-{
-	struct io_xattr *ix = io_kiocb_to_cmd(req);
-	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;
-}
-
-static 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;
-}
-
-static int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
-{
-	struct io_xattr *ix = io_kiocb_to_cmd(req);
-	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;
-}
-
 static int io_unlinkat_prep(struct io_kiocb *req,
 			    const struct io_uring_sqe *sqe)
 {