I have a first pass that works and passes pynfs! It isn't quite correct in that a rename into a directory or a create doesn't invalidate the dirent cache and thus a readdir might not show the new file.
Unlink and rename out of a directory need not invalidate and should work properly. Also left to do is memory management to constrain the total number of dirents. The inode cache LRU reclaims the least recently used entry, however that would cause problems for dirents since to reclaim one, we must hold the content lock on the containing directory, but we also hold the content lock on the directory that needs another dirent. If the two directories happen to be involved in a rename from one directory to another, the order could be reversed and create a deadlock. Another option is to have the LRU thread dispose of dirents from the least recently used directories the same way it disposes of open global file descriptors. That combined with logic that switched to uncached mode if we couldn't get a free dirent would allow a reasonable mechanism. Anyway, I encourage folks who are interested to take a look at the WIP code and play with it. Frank --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Nfs-ganesha-devel mailing list Nfs-ganesha-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel
