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Ceph is a distributed object, block, and file storage platform
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Sage Weil d2cdbe75e5 mds: defer lock eval if freezing or frozen 
We were only deferring if frozen.  But if freezing we need to too, because
of the way cap messages are deferred.  We defer cap messages if

 - inode is frozen
 - inode is freezing and locks are stable (to avoid starvation)

So if we are in a stable freezing state and start deferring caps, we can't
twiddle locks further or else we can

 - potentially starve (okay, in rare cases)
 - get stuck because we already started deferring cap messages

We would also screw up the cap message ordering if we became unstable again
and were allowed to start processing cap messages while others were still
deferred.

Signed-off-by: Sage Weil <sage.weil@dreamhost.com>
2011-07-10 14:05:10 -07:00
debian obsync: Depend on python-lxml on Debian derived platforms 2011-06-30 09:58:41 -07:00
fusetrace
man obsync: improve formatting a little bit 2011-07-01 15:44:33 -07:00
qa qa: make dir tests run by default in rename all.sh 2011-07-08 11:09:32 -07:00
src mds: defer lock eval if freezing or frozen 2011-07-10 14:05:10 -07:00
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README 

Ceph - a scalable distributed file system
-----------------------------------------

Please see http://ceph.newdream.net/ for current info.

----

To build the server daemons, and FUSE client,

$ ./autogen.sh
$ ./configure

$ make
 or
$ cd src
$ make

(Note that the FUSE client will only be built if libfuse is present.)

----

A quick summary of binaries that will be built in src/

daemons:
 cmon -- monitor daemon.  handles cluster state and configuration
         information.
 cosd -- storage daemon.  stores objects on a given block device.
 cmds -- metadata daemon.  handles file system namespace.
 ceph -- send management commands to the monitor cluster.

userland clients:
 cfuse -- fuse client.
 csyn -- synthetic workload generator client.

tools:
 monmaptool -- create/edit mon map
 osdmaptool -- create/edit osd map 
 crushtool -- create/edit crush map

scripts:
 mkcephfs -- cluster mkfs tool
 init-ceph -- init.d start/stop script