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authorChristoph Hellwig <hch@lst.de>2020-07-21 12:12:08 +0300
committerChristoph Hellwig <hch@lst.de>2020-07-31 09:17:51 +0300
commitc60166f04283ffba7b88b45d824bbfb2bfccee24 (patch)
tree511e51f8ae0e91e50742bf73ccbe302e8b14a313 /fs/init.c
parent09cbcec07b578c04ab4ab0e31940c20126f79c4b (diff)
downloadlinux-c60166f04283ffba7b88b45d824bbfb2bfccee24.tar.xz
init: add an init_mount helper
Like do_mount, but takes a kernel pointer for the destination path. Switch over the mounts in the init code and devtmpfs to it, which just happen to work due to the implicit set_fs(KERNEL_DS) during early init right now. Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/init.c')
-rw-r--r--fs/init.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/init.c b/fs/init.c
new file mode 100644
index 000000000000..c6eb724e1c7b
--- /dev/null
+++ b/fs/init.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Routines that mimic syscalls, but don't use the user address space or file
+ * descriptors. Only for init/ and related early init code.
+ */
+#include <linux/init.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/fs.h>
+#include <linux/init_syscalls.h>
+#include "internal.h"
+
+int __init init_mount(const char *dev_name, const char *dir_name,
+ const char *type_page, unsigned long flags, void *data_page)
+{
+ struct path path;
+ int ret;
+
+ ret = kern_path(dir_name, LOOKUP_FOLLOW, &path);
+ if (ret)
+ return ret;
+ ret = path_mount(dev_name, &path, type_page, flags, data_page);
+ path_put(&path);
+ return ret;
+}