From: Christoph Hellwig <hch@lst.de>
To: Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org
Subject: [PATCH 10/24] init: open code ksys_umount in handle_initrd
Date: Tue, 21 Jul 2020 18:28:04 +0200 [thread overview]
Message-ID: <20200721162818.197315-11-hch@lst.de> (raw)
In-Reply-To: <20200721162818.197315-1-hch@lst.de>
Replace ksys_umount with an open coded version that takes the proper
kernel pointer instead of relying on the implicit set_fs(KERNEL_DS)
during early init.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/namespace.c | 4 ++--
include/linux/mount.h | 1 +
include/linux/syscalls.h | 1 -
init/do_mounts_initrd.c | 6 +++++-
4 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index 2c4d7592097485..a7301790abb211 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1706,7 +1706,7 @@ static inline bool may_mandlock(void)
}
#endif
-static int path_umount(struct path *path, int flags)
+int path_umount(struct path *path, int flags)
{
struct mount *mnt;
int retval;
@@ -1736,7 +1736,7 @@ static int path_umount(struct path *path, int flags)
return retval;
}
-int ksys_umount(char __user *name, int flags)
+static int ksys_umount(char __user *name, int flags)
{
int lookup_flags = LOOKUP_MOUNTPOINT;
struct path path;
diff --git a/include/linux/mount.h b/include/linux/mount.h
index bf9896f86a48f4..e868b1ac7af90c 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -115,5 +115,6 @@ extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
int path_mount(const char *dev_name, struct path *path, const char *type_page,
unsigned long flags, void *data_page);
+int path_umount(struct path *path, int flags);
#endif /* _LINUX_MOUNT_H */
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index e43816198e6001..1a4f5d8ee7044b 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1236,7 +1236,6 @@ asmlinkage long sys_ni_syscall(void);
* the ksys_xyzyyz() functions prototyped below.
*/
-int ksys_umount(char __user *name, int flags);
int ksys_chroot(const char __user *filename);
ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count);
int ksys_chdir(const char __user *filename);
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index e08669187d63be..3fabbc82513506 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -9,6 +9,7 @@
#include <linux/freezer.h>
#include <linux/kmod.h>
#include <uapi/linux/mount.h>
+#include <linux/namei.h>
#include "do_mounts.h"
@@ -117,12 +118,15 @@ static void __init handle_initrd(void)
if (!error)
printk("okay\n");
else {
+ struct path path;
+
if (error == -ENOENT)
printk("/initrd does not exist. Ignored.\n");
else
printk("failed\n");
printk(KERN_NOTICE "Unmounting old root\n");
- ksys_umount("/old", MNT_DETACH);
+ if (!kern_path("/old", LOOKUP_MOUNTPOINT, &path))
+ path_umount(&path, MNT_DETACH);
}
}
--
2.27.0
next prev parent reply other threads:[~2020-07-21 16:29 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-21 16:27 add file system helpers that take kernel pointers for the init code v2 Christoph Hellwig
2020-07-21 16:27 ` [PATCH 01/24] fs: refactor do_mount Christoph Hellwig
2020-07-21 16:27 ` [PATCH 02/24] fs: refactor ksys_umount Christoph Hellwig
2020-07-21 16:27 ` [PATCH 03/24] fs: push the getname from do_rmdir into the callers Christoph Hellwig
2020-07-21 16:27 ` [PATCH 04/24] devtmpfs: open code do_mount Christoph Hellwig
2020-07-21 16:27 ` [PATCH 05/24] devtmpfs: open code ksys_chdir and ksys_chroot Christoph Hellwig
2020-07-21 16:49 ` Linus Torvalds
2020-07-21 17:16 ` Al Viro
2020-07-21 18:26 ` Christoph Hellwig
2020-07-21 16:28 ` [PATCH 06/24] md: open code vfs_stat in md_setup_drive Christoph Hellwig
2020-07-21 16:55 ` Al Viro
2020-07-21 18:27 ` Christoph Hellwig
2020-07-22 7:44 ` Al Viro
2020-07-22 14:05 ` Christoph Hellwig
2020-07-21 16:28 ` [PATCH 07/24] init: initialize ramdisk_execute_command at compile time Christoph Hellwig
2020-07-21 16:28 ` [PATCH 08/24] init: move the prepare_namespace prototype to init/do_mounts.h Christoph Hellwig
2020-07-21 16:28 ` [PATCH 09/24] init: mark create_dev as __init Christoph Hellwig
2020-07-21 16:28 ` Christoph Hellwig [this message]
2020-07-21 16:28 ` [PATCH 11/24] init: open code do_utimes in do_utime Christoph Hellwig
2020-07-21 16:28 ` [PATCH 12/24] init: add an init_mount helper Christoph Hellwig
2020-07-21 16:58 ` Al Viro
2020-07-21 16:28 ` [PATCH 13/24] init: add an init_unlink helper Christoph Hellwig
2020-07-21 17:12 ` Al Viro
2020-07-21 16:28 ` [PATCH 14/24] init: add an init_rmdir helper Christoph Hellwig
2020-07-21 16:28 ` [PATCH 15/24] init: add an init_chdir helper Christoph Hellwig
2020-07-21 16:28 ` [PATCH 16/24] init: add an init_chroot helper Christoph Hellwig
2020-07-21 17:10 ` Al Viro
2020-07-21 16:28 ` [PATCH 17/24] init: add an init_chown helper Christoph Hellwig
2020-07-21 16:28 ` [PATCH 18/24] init: add an init_chmod helper Christoph Hellwig
2020-07-21 16:28 ` [PATCH 19/24] init: add an init_eaccess helper Christoph Hellwig
2020-07-21 16:28 ` [PATCH 20/24] init: add an init_link helper Christoph Hellwig
2020-07-21 16:28 ` [PATCH 21/24] init: add an init_symlink helper Christoph Hellwig
2020-07-21 17:00 ` Al Viro
2020-07-21 16:28 ` [PATCH 22/24] init: add an init_mkdir helper Christoph Hellwig
2020-07-21 16:28 ` [PATCH 23/24] init: add an init_mknod helper Christoph Hellwig
2020-07-21 17:02 ` Al Viro
2020-07-21 16:28 ` [PATCH 24/24] init: add an init_lstat helper Christoph Hellwig
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