On Sat, Jul 14, 2018 at 11:36 AM Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
>
> OK, this
> /*
> * No ordinary (disk based) filesystem counts links as inodes;
> * but each new link needs a new dentry, pinning lowmem, and
> * tmpfs dentries cannot be pruned until they are unlinked.
> */
> ret = shmem_reserve_inode(inode->i_sb);
> if (ret)
> goto out;
> will probably help (on ramfs it won't, though).
Nobody who cares about memory use would use ramfs and then allow
random users on it.
I think you can exhaust memory more easily on ramfs by just writing a
huge file. Do we have any limits at all?
ramfs is fine for things like initramfs, but I think the comment says it all:
* NOTE! This filesystem is probably most useful
* not as a real filesystem, but as an example of
* how virtual filesystems can be written.
and even that comment may have been more correct back in 2000 than it is today.
Linus
