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mnt_flags fixes in do_remount()

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* need vfsmount_lock over modifying it
* need to preserve MNT_SHARED/MNT_UNBINDABLE

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2010-01-16 13:01:26 -05:00
parent df1a1ad297
commit 7b43a79f32
1 changed files with 5 additions and 1 deletions
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fs/namespace.c
+5 -1
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@@ -1536,8 +1536,12 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
err = change_mount_flags(path->mnt, flags); err = change_mount_flags(path->mnt, flags);
else else
err = do_remount_sb(sb, flags, data, 0); err = do_remount_sb(sb, flags, data, 0);
if (!err) if (!err) {
spin_lock(&vfsmount_lock);
mnt_flags |= path->mnt->mnt_flags & MNT_PNODE_MASK;
path->mnt->mnt_flags = mnt_flags; path->mnt->mnt_flags = mnt_flags;
spin_unlock(&vfsmount_lock);
}
up_write(&sb->s_umount); up_write(&sb->s_umount);
if (!err) { if (!err) {
security_sb_post_remount(path->mnt, flags, data); security_sb_post_remount(path->mnt, flags, data);