linux-kernel - [PATCH 13/24] init: add an init

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Message-Id: <20200721162818.197315-14-hch@lst.de>
Date:   Tue, 21 Jul 2020 18:28:07 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org
Subject: [PATCH 13/24] init: add an init_unlink helper

Add a simple helper to unlink with a kernel space file name and switch
the early init code over to it.  Remove the now unused ksys_unlink.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/syscalls.h | 7 -------
 init/do_mounts.h         | 3 ++-
 init/do_mounts_initrd.c  | 4 ++--
 init/do_mounts_rd.c      | 2 +-
 init/fs.c                | 6 ++++++
 init/initramfs.c         | 3 ++-
 6 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 1a4f5d8ee7044b..26f9738e5ab861 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1273,13 +1273,6 @@ int compat_ksys_ipc(u32 call, int first, int second,
  * The following kernel syscall equivalents are just wrappers to fs-internal
  * functions. Therefore, provide stubs to be inlined at the callsites.
  */
-extern long do_unlinkat(int dfd, struct filename *name);
-
-static inline long ksys_unlink(const char __user *pathname)
-{
-	return do_unlinkat(AT_FDCWD, getname(pathname));
-}
-
 long do_rmdir(int dfd, struct filename *name);
 
 static inline long ksys_rmdir(const char __user *pathname)
diff --git a/init/do_mounts.h b/init/do_mounts.h
index ce4f95fff6bc16..d2f1f335b5b5b9 100644
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -11,6 +11,7 @@
 
 int __init init_mount(const char *dev_name, const char *dir_name,
 		const char *type_page, unsigned long flags, void *data_page);
+int __init init_unlink(const char *pathname);
 
 void  mount_block_root(char *name, int flags);
 void  mount_root(void);
@@ -19,7 +20,7 @@ extern int root_mountflags;
 
 static inline __init int create_dev(char *name, dev_t dev)
 {
-	ksys_unlink(name);
+	init_unlink(name);
 	return ksys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
 }
 
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 63a3eebd36e76b..dd4680c8ac762e 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -141,11 +141,11 @@ bool __init initrd_load(void)
 		 * mounted in the normal path.
 		 */
 		if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
-			ksys_unlink("/initrd.image");
+			init_unlink("/initrd.image");
 			handle_initrd();
 			return true;
 		}
 	}
-	ksys_unlink("/initrd.image");
+	init_unlink("/initrd.image");
 	return false;
 }
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 7b64390c075043..b062f8b028ce7c 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -271,7 +271,7 @@ int __init rd_load_image(char *from)
 	fput(out_file);
 out:
 	kfree(buf);
-	ksys_unlink("/dev/ram");
+	init_unlink("/dev/ram");
 	return res;
 }
 
diff --git a/init/fs.c b/init/fs.c
index 73423f5461f934..1bdb5dc5ec12ba 100644
--- a/init/fs.c
+++ b/init/fs.c
@@ -3,6 +3,7 @@
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/fs.h>
+#include <../fs/internal.h>
 #include "do_mounts.h"
 
 int __init init_mount(const char *dev_name, const char *dir_name,
@@ -18,3 +19,8 @@ int __init init_mount(const char *dev_name, const char *dir_name,
 	path_put(&path);
 	return ret;
 }
+
+int __init init_unlink(const char *pathname)
+{
+	return do_unlinkat(AT_FDCWD, getname_kernel(pathname));
+}
diff --git a/init/initramfs.c b/init/initramfs.c
index 6135b55286fc35..664be397c6b41e 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -12,6 +12,7 @@
 #include <linux/file.h>
 #include <linux/memblock.h>
 #include <linux/namei.h>
+#include "do_mounts.h"
 
 static ssize_t __init xwrite(struct file *file, const char *p, size_t count)
 {
@@ -307,7 +308,7 @@ static void __init clean_path(char *path, umode_t fmode)
 		if (S_ISDIR(st.mode))
 			ksys_rmdir(path);
 		else
-			ksys_unlink(path);
+			init_unlink(path);
 	}
 }
 
-- 
2.27.0