From d24fbcda0c4988322949df3d759f1cfb32b32953 Mon Sep 17 00:00:00 2001 From: Joel Becker Date: Fri, 25 Jan 2008 17:02:21 -0800 Subject: ocfs2: Negotiate locking protocol versions. Currently, when ocfs2 nodes connect via TCP, they advertise their compatibility level. If the versions do not match, two nodes cannot speak to each other and they disconnect. As a result, this provides no forward or backwards compatibility. This patch implements a simple protocol negotiation at the dlm level by introducing a major/minor version number scheme for entities that communicate. Specifically, o2dlm has a major/minor version for interaction with o2dlm on other nodes, and ocfs2 itself has a major/minor version for interacting with the filesystem on other nodes. This will allow rolling upgrades of ocfs2 clusters when changes to the locking or network protocols can be done in a backwards compatible manner. In those cases, only the minor number is changed and the negotatied protocol minor is returned from dlm join. In the far less likely event that a required protocol change makes backwards compatibility impossible, we simply bump the major number. Signed-off-by: Joel Becker Signed-off-by: Mark Fasheh --- fs/ocfs2/dlmglue.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) (limited to 'fs/ocfs2/dlmglue.c') diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 3867244fb144..351130c9b734 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -43,6 +43,7 @@ #include #include "ocfs2.h" +#include "ocfs2_lockingver.h" #include "alloc.h" #include "dcache.h" @@ -258,6 +259,31 @@ static struct ocfs2_lock_res_ops ocfs2_flock_lops = { .flags = 0, }; +/* + * This is the filesystem locking protocol version. + * + * Whenever the filesystem does new things with locks (adds or removes a + * lock, orders them differently, does different things underneath a lock), + * the version must be changed. The protocol is negotiated when joining + * the dlm domain. A node may join the domain if its major version is + * identical to all other nodes and its minor version is greater than + * or equal to all other nodes. When its minor version is greater than + * the other nodes, it will run at the minor version specified by the + * other nodes. + * + * If a locking change is made that will not be compatible with older + * versions, the major number must be increased and the minor version set + * to zero. If a change merely adds a behavior that can be disabled when + * speaking to older versions, the minor version must be increased. If a + * change adds a fully backwards compatible change (eg, LVB changes that + * are just ignored by older versions), the version does not need to be + * updated. + */ +const struct dlm_protocol_version ocfs2_locking_protocol = { + .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, + .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, +}; + static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) { return lockres->l_type == OCFS2_LOCK_TYPE_META || @@ -2506,7 +2532,8 @@ int ocfs2_dlm_init(struct ocfs2_super *osb) dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); /* for now, uuid == domain */ - dlm = dlm_register_domain(osb->uuid_str, dlm_key); + dlm = dlm_register_domain(osb->uuid_str, dlm_key, + &osb->osb_locking_proto); if (IS_ERR(dlm)) { status = PTR_ERR(dlm); mlog_errno(status); -- cgit v1.2.3