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authorOlaf Kirch <okir@suse.de>2006-10-04 05:16:03 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 10:55:18 -0400
commit39be4502cb75dc26007fe1659735b26c8e63fcc6 (patch)
tree0f4c6bf14f8a975178b3192bfc9ba942da56619f /fs/lockd/svclock.c
parent031d869d0e0be18cfe35526be5608225b8f0a7be (diff)
[PATCH] knfsd: match GRANTED_RES replies using cookies
When we send a GRANTED_MSG call, we current copy the NLM cookie provided in the original LOCK call - because in 1996, some broken clients seemed to rely on this bug. However, this means the cookies are not unique, so that when the client's GRANTED_RES message comes back, we cannot simply match it based on the cookie, but have to use the client's IP address in addition. Which breaks when you have a multi-homed NFS client. The X/Open spec explicitly mentions that clients should not expect the same cookie; so one may hope that any clients that were broken in 1996 have either been fixed or rendered obsolete. Signed-off-by: Olaf Kirch <okir@suse.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/lockd/svclock.c')
-rw-r--r--fs/lockd/svclock.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 1f91567a1b88..3d2b8a831be5 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -139,19 +139,19 @@ static inline int nlm_cookie_match(struct nlm_cookie *a, struct nlm_cookie *b)
139 * Find a block with a given NLM cookie. 139 * Find a block with a given NLM cookie.
140 */ 140 */
141static inline struct nlm_block * 141static inline struct nlm_block *
142nlmsvc_find_block(struct nlm_cookie *cookie, struct sockaddr_in *sin) 142nlmsvc_find_block(struct nlm_cookie *cookie)
143{ 143{
144 struct nlm_block *block; 144 struct nlm_block *block;
145 145
146 list_for_each_entry(block, &nlm_blocked, b_list) { 146 list_for_each_entry(block, &nlm_blocked, b_list) {
147 if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie) 147 if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie))
148 && nlm_cmp_addr(sin, &block->b_host->h_addr))
149 goto found; 148 goto found;
150 } 149 }
151 150
152 return NULL; 151 return NULL;
153 152
154found: 153found:
154 dprintk("nlmsvc_find_block(%s): block=%p\n", nlmdbg_cookie2a(cookie), block);
155 kref_get(&block->b_count); 155 kref_get(&block->b_count);
156 return block; 156 return block;
157} 157}
@@ -165,6 +165,11 @@ found:
165 * request, but (as I found out later) that's because some implementations 165 * request, but (as I found out later) that's because some implementations
166 * do just this. Never mind the standards comittees, they support our 166 * do just this. Never mind the standards comittees, they support our
167 * logging industries. 167 * logging industries.
168 *
169 * 10 years later: I hope we can safely ignore these old and broken
170 * clients by now. Let's fix this so we can uniquely identify an incoming
171 * GRANTED_RES message by cookie, without having to rely on the client's IP
172 * address. --okir
168 */ 173 */
169static inline struct nlm_block * 174static inline struct nlm_block *
170nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file, 175nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
@@ -197,7 +202,7 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
197 /* Set notifier function for VFS, and init args */ 202 /* Set notifier function for VFS, and init args */
198 call->a_args.lock.fl.fl_flags |= FL_SLEEP; 203 call->a_args.lock.fl.fl_flags |= FL_SLEEP;
199 call->a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations; 204 call->a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations;
200 call->a_args.cookie = *cookie; /* see above */ 205 nlmclnt_next_cookie(&call->a_args.cookie);
201 206
202 dprintk("lockd: created block %p...\n", block); 207 dprintk("lockd: created block %p...\n", block);
203 208
@@ -640,17 +645,14 @@ static const struct rpc_call_ops nlmsvc_grant_ops = {
640 * block. 645 * block.
641 */ 646 */
642void 647void
643nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status) 648nlmsvc_grant_reply(struct nlm_cookie *cookie, u32 status)
644{ 649{
645 struct nlm_block *block; 650 struct nlm_block *block;
646 struct nlm_file *file;
647 651
648 dprintk("grant_reply: looking for cookie %x, host (%08x), s=%d \n", 652 dprintk("grant_reply: looking for cookie %x, s=%d \n",
649 *(unsigned int *)(cookie->data), 653 *(unsigned int *)(cookie->data), status);
650 ntohl(rqstp->rq_addr.sin_addr.s_addr), status); 654 if (!(block = nlmsvc_find_block(cookie)))
651 if (!(block = nlmsvc_find_block(cookie, &rqstp->rq_addr)))
652 return; 655 return;
653 file = block->b_file;
654 656
655 if (block) { 657 if (block) {
656 if (status == NLM_LCK_DENIED_GRACE_PERIOD) { 658 if (status == NLM_LCK_DENIED_GRACE_PERIOD) {