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authorNeilBrown <neilb@suse.de>2022-01-17 01:07:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-17 10:40:29 +0300
commita6097180d884ddab769fb25588ea8598589c218c (patch)
treeb306cc18579ec7aa978780bade0ade6da1cf801d /drivers/base/devtmpfs.c
parent3c750c7b614322a4ab50be0d57a76addb598d51d (diff)
downloadlinux-a6097180d884ddab769fb25588ea8598589c218c.tar.xz
devtmpfs regression fix: reconfigure on each mount
Prior to Linux v5.4 devtmpfs used mount_single() which treats the given mount options as "remount" options, so it updates the configuration of the single super_block on each mount. Since that was changed, the mount options used for devtmpfs are ignored. This is a regression which affect systemd - which mounts devtmpfs with "-o mode=755,size=4m,nr_inodes=1m". This patch restores the "remount" effect by calling reconfigure_single() Fixes: d401727ea0d7 ("devtmpfs: don't mix {ramfs,shmem}_fill_super() with mount_single()") Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base/devtmpfs.c')
-rw-r--r--drivers/base/devtmpfs.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 1e2c2d3882e2..f41063ac1aee 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -65,8 +65,15 @@ static struct dentry *public_dev_mount(struct file_system_type *fs_type, int fla
const char *dev_name, void *data)
{
struct super_block *s = mnt->mnt_sb;
+ int err;
+
atomic_inc(&s->s_active);
down_write(&s->s_umount);
+ err = reconfigure_single(s, flags, data);
+ if (err < 0) {
+ deactivate_locked_super(s);
+ return ERR_PTR(err);
+ }
return dget(s->s_root);
}