afs: Locally edit directory data for mkdir/create/unlink/...

2018-04-09T20:54:48Z

Locally edit the contents of an AFS directory upon a successful inode operation that modifies that directory (such as mkdir, create and unlink) so that we can avoid the current practice of re-downloading the directory after each change. This is viable provided that the directory version number we get back from the modifying RPC op is exactly incremented by 1 from what we had previously. The data in the directory contents is in a defined format that we have to parse locally to perform lookups and readdir, so modifying isn't a problem. If the edit fails, we just clear the VALID flag on the directory and it will be reloaded next time it is needed. Signed-off-by: David Howells

kernel/fs/afs/dir_edit.c, branch linux-5.1.y

afs: Locally edit directory data for mkdir/create/unlink/...