tree 03633d1c84e651b2e9fafda1159847a05b89b0b2
parent de5f12025572ef8fcffa4be5453061725acfb754
author Miklos Szeredi <miklos@szeredi.hu> 1136535578 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1136565235 -0800

[PATCH] fuse: support caching negative dentries

Add support for caching negative dentries.

Up till now, ->d_revalidate() always forced a new lookup on these.  Now let
the lookup method return a zero node ID (not used for anything else) meaning a
negative entry, but with a positive cache timeout.  The old way of signaling
negative entry (replying ENOENT) still works.

Userspace should check the ABI minor version to see whether sending a zero ID
is allowed by the kernel or not.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>