#ceph IRC Log

Index

IRC Log for 2011-05-24

Timestamps are in GMT/BST.

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[19:32] <bchrisman> call?
[19:33] <yehudasa> bchrisman: yes
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[20:42] <wonko_be> sage: here?
[20:43] <wonko_be> or anyone who can tell me how to get the exact startup line for the mds binary?
[20:43] <wonko_be> so I can run in with gdb
[20:45] <Tv> wonko_be: something like "cmds -f -i ID_HERE -c ceph.conf" is probably good for running under gdb
[20:45] <wonko_be> id is just the "0" that goes in mds.0 ?
[20:45] <wonko_be> perfect
[20:46] <cmccabe> wonko_be: why not just run the mds, then use gdb -p <pid> to attach
[20:46] <wonko_be> because it crashes before I can attach :-)
[20:46] <wonko_be> or I have to type crazy fast
[20:47] <cmccabe> did you look in the logs for a stack trace
[20:47] <wonko_be> yes, and sage asked me to look up a certain variable
[20:47] <cmccabe> k
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[22:54] <cmccabe> do we not support cfuse on 32-bit systems?
[22:54] <cmccabe> there was a guy on the ML asking essentially that question-- I think the answer is that we don't?
[22:55] <yehudasa> cmccabe: any reason why not?
[22:55] <cmccabe> well, it says "expect to crash shortly" if you start up on a 32-bit machine
[22:56] <cmccabe> "WARNING: Ceph inode numbers are 64 bits wide, and FUSE on 32-bit kernels does not cope well with that situation. Expect to crash shortly"
[22:56] <yehudasa> oh.. the 32 bit inos
[22:59] <cmccabe> so I'm going to just tell him we don't support it
[22:59] <cmccabe> the message seems pretty clear
[22:59] <yehudasa> cmccabe: since the message points at a problem that resides elsewhere, and I guess it's there for a few years now, things might have changed since
[23:01] <cmccabe> fuse_kernel.h does seem to be using 64-bit inode IDs everywhere...
[23:01] <cmccabe> but, oops, we still have this in fuse_lowlevel.h
[23:01] <cmccabe> typedef unsigned long fuse_ino_t
[23:02] <Tv> cmccabe: yeah we can't handle ceph inodes right with that limitation, it's unsupported
[23:03] <cmccabe> let me see if the latest fuse snapshot still has that
[23:03] <Tv> cmccabe: it'd probably be better if it didn't even compile on 32-bit :-/
[23:03] <yehudasa> hmm.. the fact that it's 32 bit doesn't mean much.. in 32 bit kernels we have the same issue but we can reuse the same ino anyway
[23:03] <yehudasa> the question is how does fuse handle duplicate inos
[23:04] <cmccabe> the concept of a duplicate inode confuses and frightens me
[23:04] <cmccabe> I'm not sure how any filesystem could cope with that sanely, can you elaborate?
[23:05] <cmccabe> yep, the latest from git still has that typedef
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[23:06] <cmccabe> this is weird... unless I'm misinterpreting this, the FUSE kernel interface clearly defines the sizes of inode indexes as 64 bits
[23:06] <cmccabe> but then their silly wrapper header file just uses unsigned long
[23:09] <cmccabe> oh, it looks like someone wrote a wiki page
[23:09] <cmccabe> http://ceph.newdream.net/wiki/Cfuse_on_32-bit_kernels
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[23:13] <cmccabe> apparently inode numbers are 32 bit on 32-bit kernels
[23:13] <cmccabe> so fuse isn't so silly after all
[23:13] <cmccabe> still, it looks like cfuse ain't gonna work on 32-bit any time soon.
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