Daemons that need to be launched while the rootfs is read-only can now
poll /proc/mounts to be notified when their O_RDWR requests may no
longer end in EROFS.
Cc: Kay Sievers <kay.sievers@xxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
This change is prompted by mdmon which is a userspace metadata handler
for software-raid arrays. It will use this notification to drop a
communication socket and pidfile on a raid-rootfs once it becomes
writable.
fs/namespace.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index 6e283c9..1bd5ba2 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1553,8 +1553,13 @@ static noinline int do_remount(struct nameidata *nd, int flags, int mnt_flags,
if (!err)
nd->path.mnt->mnt_flags = mnt_flags;
up_write(&sb->s_umount);
- if (!err)
+ if (!err) {
security_sb_post_remount(nd->path.mnt, flags, data);
+
+ spin_lock(&vfsmount_lock);
+ touch_mnt_namespace(nd->path.mnt->mnt_ns);
+ spin_unlock(&vfsmount_lock);
+ }
return err;
}
--
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