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ocfs2: Negotiate locking protocol versions.

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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 <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Joel Becker 2008-01-25 17:02:21 -08:00 committed by Mark Fasheh
parent 3e6bdf473f
commit d24fbcda0c
12 changed files with 288 additions and 34 deletions
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11
fs/ocfs2/cluster/tcp_internal.h
View file

@ -38,6 +38,15 @@
* locking semantics of the file system using the protocol. It should
* be somewhere else, I'm sure, but right now it isn't.
*
* With version 11, we separate out the filesystem locking portion. The
* filesystem now has a major.minor version it negotiates. Version 11
* introduces this negotiation to the o2dlm protocol, and as such the
* version here in tcp_internal.h should not need to be bumped for
* filesystem locking changes.
*
* New in version 11
* - Negotiation of filesystem locking in the dlm join.
*
* New in version 10:
* - Meta/data locks combined
*
@ -66,7 +75,7 @@
* - full 64 bit i_size in the metadata lock lvbs
* - introduction of "rw" lock and pushing meta/data locking down
*/
#define O2NET_PROTOCOL_VERSION 10ULL
#define O2NET_PROTOCOL_VERSION 11ULL
struct o2net_handshake {
__be64 protocol_version;
__be64 connector_id;

7
fs/ocfs2/dlm/dlmapi.h
View file

@ -193,7 +193,12 @@ enum dlm_status dlmunlock(struct dlm_ctxt *dlm,
dlm_astunlockfunc_t *unlockast,
void *data);
struct dlm_ctxt * dlm_register_domain(const char *domain, u32 key);
struct dlm_protocol_version {
u8 pv_major;
u8 pv_minor;
};
struct dlm_ctxt * dlm_register_domain(const char *domain, u32 key,
struct dlm_protocol_version *fs_proto);
void dlm_unregister_domain(struct dlm_ctxt *dlm);

24
fs/ocfs2/dlm/dlmcommon.h
View file

@ -142,6 +142,12 @@ struct dlm_ctxt
spinlock_t work_lock;
struct list_head dlm_domain_handlers;
struct list_head dlm_eviction_callbacks;
/* The filesystem specifies this at domain registration. We
* cache it here to know what to tell other nodes. */
struct dlm_protocol_version fs_locking_proto;
/* This is the inter-dlm communication version */
struct dlm_protocol_version dlm_locking_proto;
};
static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
@ -589,10 +595,24 @@ struct dlm_proxy_ast
#define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
#define DLM_MOD_KEY (0x666c6172)
enum dlm_query_join_response {
enum dlm_query_join_response_code {
JOIN_DISALLOW = 0,
JOIN_OK,
JOIN_OK_NO_MAP,
JOIN_PROTOCOL_MISMATCH,
};
union dlm_query_join_response {
u32 intval;
struct {
u8 code; /* Response code. dlm_minor and fs_minor
are only valid if this is JOIN_OK */
u8 dlm_minor; /* The minor version of the protocol the
dlm is speaking. */
u8 fs_minor; /* The minor version of the protocol the
filesystem is speaking. */
u8 reserved;
} packet;
};
struct dlm_lock_request
@ -633,6 +653,8 @@ struct dlm_query_join_request
u8 node_idx;
u8 pad1[2];
u8 name_len;
struct dlm_protocol_version dlm_proto;
struct dlm_protocol_version fs_proto;
u8 domain[O2NM_MAX_NAME_LEN];
u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)];
};

195
fs/ocfs2/dlm/dlmdomain.c
View file

@ -123,6 +123,17 @@ DEFINE_SPINLOCK(dlm_domain_lock);
LIST_HEAD(dlm_domains);
static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
/*
* The supported protocol version for DLM communication. Running domains
* will have a negotiated version with the same major number and a minor
* number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
* be used to determine what a running domain is actually using.
*/
static const struct dlm_protocol_version dlm_protocol = {
.pv_major = 1,
.pv_minor = 0,
};
#define DLM_DOMAIN_BACKOFF_MS 200
static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
@ -133,6 +144,8 @@ static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data);
static int dlm_protocol_compare(struct dlm_protocol_version *existing,
struct dlm_protocol_version *request);
static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
@ -668,11 +681,45 @@ void dlm_unregister_domain(struct dlm_ctxt *dlm)
}
EXPORT_SYMBOL_GPL(dlm_unregister_domain);
static int dlm_query_join_proto_check(char *proto_type, int node,
struct dlm_protocol_version *ours,
struct dlm_protocol_version *request)
{
int rc;
struct dlm_protocol_version proto = *request;
if (!dlm_protocol_compare(ours, &proto)) {
mlog(0,
"node %u wanted to join with %s locking protocol "
"%u.%u, we respond with %u.%u\n",
node, proto_type,
request->pv_major,
request->pv_minor,
proto.pv_major, proto.pv_minor);
request->pv_minor = proto.pv_minor;
rc = 0;
} else {
mlog(ML_NOTICE,
"Node %u wanted to join with %s locking "
"protocol %u.%u, but we have %u.%u, disallowing\n",
node, proto_type,
request->pv_major,
request->pv_minor,
ours->pv_major,
ours->pv_minor);
rc = 1;
}
return rc;
}
static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data)
{
struct dlm_query_join_request *query;
enum dlm_query_join_response response;
union dlm_query_join_response response = {
.packet.code = JOIN_DISALLOW,
};
struct dlm_ctxt *dlm = NULL;
u8 nodenum;
@ -690,11 +737,11 @@ static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
mlog(0, "node %u is not in our live map yet\n",
query->node_idx);
response = JOIN_DISALLOW;
response.packet.code = JOIN_DISALLOW;
goto respond;
}
response = JOIN_OK_NO_MAP;
response.packet.code = JOIN_OK_NO_MAP;
spin_lock(&dlm_domain_lock);
dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
@ -713,7 +760,7 @@ static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
mlog(0, "disallow join as node %u does not "
"have node %u in its nodemap\n",
query->node_idx, nodenum);
response = JOIN_DISALLOW;
response.packet.code = JOIN_DISALLOW;
goto unlock_respond;
}
}
@ -733,30 +780,48 @@ static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
/*If this is a brand new context and we
* haven't started our join process yet, then
* the other node won the race. */
response = JOIN_OK_NO_MAP;
response.packet.code = JOIN_OK_NO_MAP;
} else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
/* Disallow parallel joins. */
response = JOIN_DISALLOW;
response.packet.code = JOIN_DISALLOW;
} else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
mlog(0, "node %u trying to join, but recovery "
"is ongoing.\n", bit);
response = JOIN_DISALLOW;
response.packet.code = JOIN_DISALLOW;
} else if (test_bit(bit, dlm->recovery_map)) {
mlog(0, "node %u trying to join, but it "
"still needs recovery.\n", bit);
response = JOIN_DISALLOW;
response.packet.code = JOIN_DISALLOW;
} else if (test_bit(bit, dlm->domain_map)) {
mlog(0, "node %u trying to join, but it "
"is still in the domain! needs recovery?\n",
bit);
response = JOIN_DISALLOW;
response.packet.code = JOIN_DISALLOW;
} else {
/* Alright we're fully a part of this domain
* so we keep some state as to who's joining
* and indicate to him that needs to be fixed
* up. */
response = JOIN_OK;
__dlm_set_joining_node(dlm, query->node_idx);
/* Make sure we speak compatible locking protocols. */
if (dlm_query_join_proto_check("DLM", bit,
&dlm->dlm_locking_proto,
&query->dlm_proto)) {
response.packet.code =
JOIN_PROTOCOL_MISMATCH;
} else if (dlm_query_join_proto_check("fs", bit,
&dlm->fs_locking_proto,
&query->fs_proto)) {
response.packet.code =
JOIN_PROTOCOL_MISMATCH;
} else {
response.packet.dlm_minor =
query->dlm_proto.pv_minor;
response.packet.fs_minor =
query->fs_proto.pv_minor;
response.packet.code = JOIN_OK;
__dlm_set_joining_node(dlm, query->node_idx);
}
}
spin_unlock(&dlm->spinlock);
@ -765,9 +830,9 @@ unlock_respond:
spin_unlock(&dlm_domain_lock);
respond:
mlog(0, "We respond with %u\n", response);
mlog(0, "We respond with %u\n", response.packet.code);
return response;
return response.intval;
}
static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
@ -899,10 +964,11 @@ static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
static int dlm_request_join(struct dlm_ctxt *dlm,
int node,
enum dlm_query_join_response *response)
enum dlm_query_join_response_code *response)
{
int status, retval;
int status;
struct dlm_query_join_request join_msg;
union dlm_query_join_response join_resp;
mlog(0, "querying node %d\n", node);
@ -910,12 +976,15 @@ static int dlm_request_join(struct dlm_ctxt *dlm,
join_msg.node_idx = dlm->node_num;
join_msg.name_len = strlen(dlm->name);
memcpy(join_msg.domain, dlm->name, join_msg.name_len);
join_msg.dlm_proto = dlm->dlm_locking_proto;
join_msg.fs_proto = dlm->fs_locking_proto;
/* copy live node map to join message */
byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES);
status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
sizeof(join_msg), node, &retval);
sizeof(join_msg), node,
&join_resp.intval);
if (status < 0 && status != -ENOPROTOOPT) {
mlog_errno(status);
goto bail;
@ -928,14 +997,41 @@ static int dlm_request_join(struct dlm_ctxt *dlm,
if (status == -ENOPROTOOPT) {
status = 0;
*response = JOIN_OK_NO_MAP;
} else if (retval == JOIN_DISALLOW ||
retval == JOIN_OK ||
retval == JOIN_OK_NO_MAP) {
*response = retval;
} else if (join_resp.packet.code == JOIN_DISALLOW ||
join_resp.packet.code == JOIN_OK_NO_MAP) {
*response = join_resp.packet.code;
} else if (join_resp.packet.code == JOIN_PROTOCOL_MISMATCH) {
mlog(ML_NOTICE,
"This node requested DLM locking protocol %u.%u and "
"filesystem locking protocol %u.%u. At least one of "
"the protocol versions on node %d is not compatible, "
"disconnecting\n",
dlm->dlm_locking_proto.pv_major,
dlm->dlm_locking_proto.pv_minor,
dlm->fs_locking_proto.pv_major,
dlm->fs_locking_proto.pv_minor,
node);
status = -EPROTO;
*response = join_resp.packet.code;
} else if (join_resp.packet.code == JOIN_OK) {
*response = join_resp.packet.code;
/* Use the same locking protocol as the remote node */
dlm->dlm_locking_proto.pv_minor =
join_resp.packet.dlm_minor;
dlm->fs_locking_proto.pv_minor =
join_resp.packet.fs_minor;
mlog(0,
"Node %d responds JOIN_OK with DLM locking protocol "
"%u.%u and fs locking protocol %u.%u\n",
node,
dlm->dlm_locking_proto.pv_major,
dlm->dlm_locking_proto.pv_minor,
dlm->fs_locking_proto.pv_major,
dlm->fs_locking_proto.pv_minor);
} else {
status = -EINVAL;
mlog(ML_ERROR, "invalid response %d from node %u\n", retval,
node);
mlog(ML_ERROR, "invalid response %d from node %u\n",
join_resp.packet.code, node);
}
mlog(0, "status %d, node %d response is %d\n", status, node,
@ -1008,7 +1104,7 @@ struct domain_join_ctxt {
static int dlm_should_restart_join(struct dlm_ctxt *dlm,
struct domain_join_ctxt *ctxt,
enum dlm_query_join_response response)
enum dlm_query_join_response_code response)
{
int ret;
@ -1034,7 +1130,7 @@ static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
{
int status = 0, tmpstat, node;
struct domain_join_ctxt *ctxt;
enum dlm_query_join_response response = JOIN_DISALLOW;
enum dlm_query_join_response_code response = JOIN_DISALLOW;
mlog_entry("%p", dlm);
@ -1450,10 +1546,38 @@ leave:
}
/*
* dlm_register_domain: one-time setup per "domain"
* Compare a requested locking protocol version against the current one.
*
* If the major numbers are different, they are incompatible.
* If the current minor is greater than the request, they are incompatible.
* If the current minor is less than or equal to the request, they are
* compatible, and the requester should run at the current minor version.
*/
static int dlm_protocol_compare(struct dlm_protocol_version *existing,
struct dlm_protocol_version *request)
{
if (existing->pv_major != request->pv_major)
return 1;
if (existing->pv_minor > request->pv_minor)
return 1;
if (existing->pv_minor < request->pv_minor)
request->pv_minor = existing->pv_minor;
return 0;
}
/*
* dlm_register_domain: one-time setup per "domain".
*
* The filesystem passes in the requested locking version via proto.
* If registration was successful, proto will contain the negotiated
* locking protocol.
*/
struct dlm_ctxt * dlm_register_domain(const char *domain,
u32 key)
u32 key,
struct dlm_protocol_version *fs_proto)
{
int ret;
struct dlm_ctxt *dlm = NULL;
@ -1496,6 +1620,15 @@ retry:
goto retry;
}
if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
mlog(ML_ERROR,
"Requested locking protocol version is not "
"compatible with already registered domain "
"\"%s\"\n", domain);
ret = -EPROTO;
goto leave;
}
__dlm_get(dlm);
dlm->num_joins++;
@ -1526,6 +1659,13 @@ retry:
list_add_tail(&dlm->list, &dlm_domains);
spin_unlock(&dlm_domain_lock);
/*
* Pass the locking protocol version into the join. If the join
* succeeds, it will have the negotiated protocol set.
*/
dlm->dlm_locking_proto = dlm_protocol;
dlm->fs_locking_proto = *fs_proto;
ret = dlm_join_domain(dlm);
if (ret) {
mlog_errno(ret);
@ -1533,6 +1673,9 @@ retry:
goto leave;
}
/* Tell the caller what locking protocol we negotiated */
*fs_proto = dlm->fs_locking_proto;
ret = 0;
leave:
if (new_ctxt)

15
fs/ocfs2/dlm/dlmfs.c
View file

@ -60,6 +60,8 @@
#define MLOG_MASK_PREFIX ML_DLMFS
#include "cluster/masklog.h"
#include "ocfs2_lockingver.h"
static const struct super_operations dlmfs_ops;
static const struct file_operations dlmfs_file_operations;
static const struct inode_operations dlmfs_dir_inode_operations;
@ -69,6 +71,16 @@ static struct kmem_cache *dlmfs_inode_cache;
struct workqueue_struct *user_dlm_worker;
/*
* This is the userdlmfs locking protocol version.
*
* See fs/ocfs2/dlmglue.c for more details on locking versions.
*/
static const struct dlm_protocol_version user_locking_protocol = {
.pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
.pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
};
/*
* decodes a set of open flags into a valid lock level and a set of flags.
* returns < 0 if we have invalid flags
@ -416,6 +428,7 @@ static int dlmfs_mkdir(struct inode * dir,
struct qstr *domain = &dentry->d_name;
struct dlmfs_inode_private *ip;
struct dlm_ctxt *dlm;
struct dlm_protocol_version proto = user_locking_protocol;
mlog(0, "mkdir %.*s\n", domain->len, domain->name);
@ -435,7 +448,7 @@ static int dlmfs_mkdir(struct inode * dir,
ip = DLMFS_I(inode);
dlm = user_dlm_register_context(domain);
dlm = user_dlm_register_context(domain, &proto);
if (IS_ERR(dlm)) {
status = PTR_ERR(dlm);
mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",

5
fs/ocfs2/dlm/userdlm.c
View file

@ -645,7 +645,8 @@ bail:
return status;
}
struct dlm_ctxt *user_dlm_register_context(struct qstr *name)
struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
struct dlm_protocol_version *proto)
{
struct dlm_ctxt *dlm;
u32 dlm_key;
@ -661,7 +662,7 @@ struct dlm_ctxt *user_dlm_register_context(struct qstr *name)
snprintf(domain, name->len + 1, "%.*s", name->len, name->name);
dlm = dlm_register_domain(domain, dlm_key);
dlm = dlm_register_domain(domain, dlm_key, proto);
if (IS_ERR(dlm))
mlog_errno(PTR_ERR(dlm));

3
fs/ocfs2/dlm/userdlm.h
View file

@ -83,7 +83,8 @@ void user_dlm_write_lvb(struct inode *inode,
void user_dlm_read_lvb(struct inode *inode,
char *val,
unsigned int len);
struct dlm_ctxt *user_dlm_register_context(struct qstr *name);
struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
struct dlm_protocol_version *proto);
void user_dlm_unregister_context(struct dlm_ctxt *dlm);
struct dlmfs_inode_private {

29
fs/ocfs2/dlmglue.c
View file

@ -43,6 +43,7 @@
#include <cluster/masklog.h>
#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);

1
fs/ocfs2/dlmglue.h
View file

@ -116,4 +116,5 @@ void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
extern const struct dlm_protocol_version ocfs2_locking_protocol;
#endif /* DLMGLUE_H */

1
fs/ocfs2/ocfs2.h
View file

@ -251,6 +251,7 @@ struct ocfs2_super
struct ocfs2_lock_res osb_rename_lockres;
struct dlm_eviction_cb osb_eviction_cb;
struct ocfs2_dlm_debug *osb_dlm_debug;
struct dlm_protocol_version osb_locking_proto;
struct dentry *osb_debug_root;

30
fs/ocfs2/ocfs2_lockingver.h Normal file
View file

@ -0,0 +1,30 @@
/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* ocfs2_lockingver.h
*
* Defines OCFS2 Locking version values.
*
* Copyright (C) 2008 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License, version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#ifndef OCFS2_LOCKINGVER_H
#define OCFS2_LOCKINGVER_H
/*
* The protocol version for ocfs2 cluster locking. See dlmglue.c for
* more details.
*/
#define OCFS2_LOCKING_PROTOCOL_MAJOR 1
#define OCFS2_LOCKING_PROTOCOL_MINOR 0
#endif /* OCFS2_LOCKINGVER_H */

1
fs/ocfs2/super.c
View file

@ -1355,6 +1355,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
sb->s_fs_info = osb;
sb->s_op = &ocfs2_sops;
sb->s_export_op = &ocfs2_export_ops;
osb->osb_locking_proto = ocfs2_locking_protocol;
sb->s_time_gran = 1;
sb->s_flags |= MS_NOATIME;
/* this is needed to support O_LARGEFILE */