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 23/24] init: add an init_mknod helper
Date: Tue, 21 Jul 2020 18:28:17 +0200 [thread overview]
Message-ID: <20200721162818.197315-24-hch@lst.de> (raw)
In-Reply-To: <20200721162818.197315-1-hch@lst.de>
Add a simple helper to mknod with a kernel space file name and switch
the early init code over to it. Remove the now unused ksys_mknod.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/internal.h | 2 --
fs/namei.c | 2 +-
include/linux/syscalls.h | 9 ---------
init/do_mounts.h | 3 ++-
init/fs.c | 25 +++++++++++++++++++++++++
init/initramfs.c | 2 +-
init/noinitramfs.c | 3 +--
7 files changed, 30 insertions(+), 16 deletions(-)
diff --git a/fs/internal.h b/fs/internal.h
index 54cf897bd0c18f..490cf426ec9f67 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -62,8 +62,6 @@ extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
struct path *path, struct path *root);
extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
const char *, unsigned int, struct path *);
-long do_mknodat(int dfd, const char __user *filename, umode_t mode,
- unsigned int dev);
long do_rmdir(int dfd, struct filename *name);
long do_unlinkat(int dfd, struct filename *name);
int may_linkat(struct path *link);
diff --git a/fs/namei.c b/fs/namei.c
index d6b25dd32f4d50..fde8fe086c090d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3564,7 +3564,7 @@ static int may_mknod(umode_t mode)
}
}
-long do_mknodat(int dfd, const char __user *filename, umode_t mode,
+static long do_mknodat(int dfd, const char __user *filename, umode_t mode,
unsigned int dev)
{
struct dentry *dentry;
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 5ef77a91382aa5..63046c5e9fc5d4 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1270,15 +1270,6 @@ 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_mknodat(int dfd, const char __user *filename, umode_t mode,
- unsigned int dev);
-
-static inline long ksys_mknod(const char __user *filename, umode_t mode,
- unsigned int dev)
-{
- return do_mknodat(AT_FDCWD, filename, mode, dev);
-}
-
extern int do_fchownat(int dfd, const char __user *filename, uid_t user,
gid_t group, int flag);
diff --git a/init/do_mounts.h b/init/do_mounts.h
index 62ae09b96be025..a793bafc6c6f2b 100644
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -16,6 +16,7 @@ int __init init_chroot(const char *filename);
int __init init_chown(const char *filename, uid_t user, gid_t group, int flags);
int __init init_chmod(const char *filename, umode_t mode);
int __init init_eaccess(const char *filename);
+int __init init_mknod(const char *filename, umode_t mode, unsigned int dev);
int __init init_link(const char *oldname, const char *newname);
int __init init_symlink(const char *oldname, const char *newname);
int __init init_unlink(const char *pathname);
@@ -30,7 +31,7 @@ extern int root_mountflags;
static inline __init int create_dev(char *name, dev_t dev)
{
init_unlink(name);
- return ksys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
+ return init_mknod(name, S_IFBLK | 0600, new_encode_dev(dev));
}
#ifdef CONFIG_BLK_DEV_RAM
diff --git a/init/fs.c b/init/fs.c
index 0793a6872d0e33..7f0e50a877fc98 100644
--- a/init/fs.c
+++ b/init/fs.c
@@ -103,6 +103,31 @@ int __init init_eaccess(const char *filename)
return error;
}
+int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
+{
+ struct dentry *dentry;
+ struct path path;
+ int error;
+
+ if (S_ISFIFO(mode) || S_ISSOCK(mode))
+ dev = 0;
+ else if (!(S_ISBLK(mode) || S_ISCHR(mode)))
+ return -EINVAL;
+
+ dentry = user_path_create(AT_FDCWD, filename, &path, 0);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+
+ if (!IS_POSIXACL(path.dentry->d_inode))
+ mode &= ~current_umask();
+ error = security_path_mknod(&path, dentry, mode, dev);
+ if (!error)
+ error = vfs_mknod(path.dentry->d_inode, dentry, mode,
+ new_decode_dev(dev));
+ done_path_create(&path, dentry);
+ return error;
+}
+
int __init init_link(const char *oldname, const char *newname)
{
struct dentry *new_dentry;
diff --git a/init/initramfs.c b/init/initramfs.c
index b1a0a1d5c3c135..bd685fdb5840f3 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -359,7 +359,7 @@ static int __init do_name(void)
} else if (S_ISBLK(mode) || S_ISCHR(mode) ||
S_ISFIFO(mode) || S_ISSOCK(mode)) {
if (maybe_link() == 0) {
- ksys_mknod(collected, mode, rdev);
+ init_mknod(collected, mode, rdev);
init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW);
init_chmod(collected, mode);
do_utime(collected, mtime);
diff --git a/init/noinitramfs.c b/init/noinitramfs.c
index b8bdba1c949cf9..490f2bd2b49979 100644
--- a/init/noinitramfs.c
+++ b/init/noinitramfs.c
@@ -22,8 +22,7 @@ static int __init default_rootfs(void)
if (err < 0)
goto out;
- err = ksys_mknod((const char __user __force *) "/dev/console",
- S_IFCHR | S_IRUSR | S_IWUSR,
+ err = init_mknod("/dev/console", S_IFCHR | S_IRUSR | S_IWUSR,
new_encode_dev(MKDEV(5, 1)));
if (err < 0)
goto out;
--
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 ` [PATCH 10/24] init: open code ksys_umount in handle_initrd Christoph Hellwig
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 ` Christoph Hellwig [this message]
2020-07-21 17:02 ` [PATCH 23/24] init: add an init_mknod helper Al Viro
2020-07-21 16:28 ` [PATCH 24/24] init: add an init_lstat helper Christoph Hellwig
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