undefined | Better HN

0 pointsasveikau3y ago0 comments

But if a negative dentry does not yet exist, and a filename is requested for the first time, does it read from the fs?

The DDoS scenario would be doing GET requests of random nonexistent filenames. You could change the name at every step so that the check for a negative dentry is never a cache hit.

0 comments

vocram3y ago

If requesting http paths result in accessing the equivalent fs paths, then yes, you can dos it. But nowadays it’s uncommon for a webserver.

asveikauOP3y ago

Well the point under discussion is that i/o from a floppy disk is slow. Most servers have much faster disks and it'd be absurd to consider this.

Also the page/buffer cache would probably cache the FAT direntries so probably not a huge issue here.

j / k navigate · click thread line to collapse