4 Commits

Author	SHA1	Message	Date
Sage Weil	1654dd0cf5	ceph: make object hash a pg_pool property ... The object will be hashed to a placement seed (ps) based on the pg_pool's hash function. This allows new hashes to be introduced into an existing object store, or selection of a hash appropriate to the objects that will be stored in a particular pool. Signed-off-by: Sage Weil <sage@newdream.net>	2009-11-06 21:55:25 -08:00
Sage Weil	cfbbcd24a6	ceph: use strong hash function for mapping objects to pgs ... We were using the (weak) dcache hash function, but it was leaving lower bits consecutive for consecutive (inode) objects. We really want to make the object to pg mapping random and uniform, so use a proper hash function here. This is Robert Jenkin's public domain hash function (with some minor cleanup): http://burtleburtle.net/bob/hash/evahash.html This is a protocol revision. Signed-off-by: Sage Weil <sage@newdream.net>	2009-11-06 16:44:05 -08:00
Sage Weil	752727a1b2	ceph: add file layout validation ... This tracks updates to code shared with userspace. Signed-off-by: Sage Weil <sage@newdream.net>	2009-10-09 16:39:30 -07:00
Sage Weil	0dee3c28af	ceph: on-wire types ... These headers describe the types used to exchange messages between the Ceph client and various servers. All types are little-endian and packed. These headers are shared between the kernel and userspace, so all types are in terms of e.g. __u32. Additionally, we define a few magic values to identify the current version of the protocol(s) in use, so that discrepancies to be detected on mount. Signed-off-by: Sage Weil <sage@newdream.net>	2009-10-06 11:31:06 -07:00