Messages in this thread | | | Date | Thu, 24 Feb 2011 13:51:03 -0800 (PST) | From | Dan Magenheimer <> | Subject | RE: encode_fh: have inode but no dentry |
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> From: Al Viro [mailto:viro@ZenIV.linux.org.uk] > Subject: Re: encode_fh: have inode but no dentry > > On Thu, Feb 24, 2011 at 01:16:34PM -0800, Dan Magenheimer wrote: > > Hi Aneesh -- > > > > I see you are continuing with encode_fh related > > development so I thought I would bring this up > > with you. > > > > I have a need to call the encode_fh op in a > > situation where I have an inode but not a dentry, > > and calling d_find_alias(inode) sometimes returns > > NULL. In my usage, connectable is always zero, so > > having just the inode should be sufficient to get > > useful results from encode_fh, at least for the > > filesystems I've looked at. > > [snip] > > > Such a change would require a patch that touched > > nearly every filesystem so it's clearly not to > > be taken lightly. > > > > Any thoughts on this? > > How about "tell us what do you need that for", for starters?
(Wow, that was fast! /me pictures a 64-core Al Viro parallelizing incoming lkml email.)
It's for some work I'm building on top of cleancache. Since cleancache isn't merged (yet), it's not pressing, but this seemed a reasonable approach so, before I started looking at more complicated alternatives, I thought I'd get some idea if this is feasible or not.
The situation arises when the inode is in cache but the dentry is not, but I still need a filehandle. In the non-connectable case, this should still be OK. Seems like a case that might be more broadly useful.
Thanks, Dan
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