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init: add an init_mount helper

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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>
This commit is contained in:
Christoph Hellwig 2020-07-21 11:12:08 +02:00
parent 09cbcec07b
commit c60166f042
9 changed files with 46 additions and 11 deletions
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5
drivers/base/devtmpfs.c
View file

@ -25,6 +25,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/init_syscalls.h>
#include <uapi/linux/mount.h>
#include "base.h"
@ -359,7 +360,7 @@ int __init devtmpfs_mount(void)
if (!thread)
return 0;
err = do_mount("devtmpfs", "dev", "devtmpfs", MS_SILENT, NULL);
err = init_mount("devtmpfs", "dev", "devtmpfs", MS_SILENT, NULL);
if (err)
printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
else
@ -408,7 +409,7 @@ static int __init devtmpfs_setup(void *p)
err = ksys_unshare(CLONE_NEWNS);
if (err)
goto out;
err = do_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, NULL);
err = init_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, NULL);
if (err)
goto out;
ksys_chdir("/.."); /* will traverse into overmounted root */