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[RFC PATCH] touch_mnt_namespace when the mount flags change

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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 <[email protected]>
Cc: Neil Brown <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2008-09-26 19:01:20 -07:00 • committed by Al Viro
commit 0e55a7cca4
1 changed files with 6 additions and 1 deletions
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7
fs/namespace.c
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@ -1550,8 +1550,13 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
if (!err)
path->mnt->mnt_flags = mnt_flags;
up_write(&sb->s_umount);
if (!err)
if (!err) {
security_sb_post_remount(path->mnt, flags, data);
spin_lock(&vfsmount_lock);
touch_mnt_namespace(path->mnt->mnt_ns);
spin_unlock(&vfsmount_lock);
}
return err;
}