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

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Date:   Tue, 21 Jul 2020 18:28:18 +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 24/24] init: add an init_lstat helper

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

Signed-off-by: Christoph Hellwig <hch@....de>
---
 init/do_mounts.h |  1 +
 init/fs.c        | 14 ++++++++++++++
 init/initramfs.c |  2 +-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/init/do_mounts.h b/init/do_mounts.h
index a793bafc6c6f2b..20766cfe549b48 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_lstat(const char *filename, struct kstat *stat);
 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);
diff --git a/init/fs.c b/init/fs.c
index 7f0e50a877fc98..b387ff67f365db 100644
--- a/init/fs.c
+++ b/init/fs.c
@@ -103,6 +103,20 @@ int __init init_eaccess(const char *filename)
 	return error;
 }
 
+int __init init_lstat(const char *filename, struct kstat *stat)
+{
+	struct path path;
+	int error;
+
+	error = kern_path(filename, 0, &path);
+	if (error)
+		return error;
+	error = vfs_getattr(&path, stat, STATX_BASIC_STATS,
+			    AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT);
+	path_put(&path);
+	return error;
+}
+
 int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
 {
 	struct dentry *dentry;
diff --git a/init/initramfs.c b/init/initramfs.c
index bd685fdb5840f3..8c9f92f1660b96 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -304,7 +304,7 @@ static void __init clean_path(char *path, umode_t fmode)
 {
 	struct kstat st;
 
-	if (!vfs_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) {
+	if (!init_lstat(path, &st) && (st.mode ^ fmode) & S_IFMT) {
 		if (S_ISDIR(st.mode))
 			init_rmdir(path);
 		else
-- 
2.27.0