NLM: Fix a circular lock dependency in lockd

The problem is that the garbage collector for the 'host' structures
nlm_gc_hosts(), holds nlm_host_mutex while calling down to
nlmsvc_mark_resources, which, eventually takes the file->f_mutex.

We cannot therefore call nlmsvc_lookup_host() from within
nlmsvc_create_block, since the caller will already hold file->f_mutex, so
the attempt to grab nlm_host_mutex may deadlock.

Fix the problem by calling nlmsvc_lookup_host() outside the file->f_mutex.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index a21e4bc..d098c7a 100644 (file)
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -171,19 +171,14 @@ found:
  * GRANTED_RES message by cookie, without having to rely on the client's IP
  * address. --okir
  */
-static inline struct nlm_block *
-nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
-               struct nlm_lock *lock, struct nlm_cookie *cookie)
+static struct nlm_block *
+nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_host *host,
+                   struct nlm_file *file, struct nlm_lock *lock,
+                   struct nlm_cookie *cookie)
 {
        struct nlm_block        *block;
-       struct nlm_host         *host;
        struct nlm_rqst         *call = NULL;
 
-       /* Create host handle for callback */
-       host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len);
-       if (host == NULL)
-               return NULL;
-
        call = nlm_alloc_call(host);
        if (call == NULL)
                return NULL;
@@ -366,6 +361,7 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
                        struct nlm_lock *lock, int wait, struct nlm_cookie *cookie)
 {
        struct nlm_block        *block = NULL;
+       struct nlm_host         *host;
        int                     error;
        __be32                  ret;
 
@@ -377,6 +373,10 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
                                (long long)lock->fl.fl_end,
                                wait);
 
+       /* Create host handle for callback */
+       host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len);
+       if (host == NULL)
+               return nlm_lck_denied_nolocks;
 
        /* Lock file against concurrent access */
        mutex_lock(&file->f_mutex);
@@ -385,7 +385,8 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
         */
        block = nlmsvc_lookup_block(file, lock);
        if (block == NULL) {
-               block = nlmsvc_create_block(rqstp, file, lock, cookie);
+               block = nlmsvc_create_block(rqstp, nlm_get_host(host), file,
+                               lock, cookie);
                ret = nlm_lck_denied_nolocks;
                if (block == NULL)
                        goto out;
@@ -449,6 +450,7 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
 out:
        mutex_unlock(&file->f_mutex);
        nlmsvc_release_block(block);
+       nlm_release_host(host);
        dprintk("lockd: nlmsvc_lock returned %u\n", ret);
        return ret;
 }
@@ -477,10 +479,15 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
 
        if (block == NULL) {
                struct file_lock *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
+               struct nlm_host *host;
 
                if (conf == NULL)
                        return nlm_granted;
-               block = nlmsvc_create_block(rqstp, file, lock, cookie);
+               /* Create host handle for callback */
+               host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len);
+               if (host == NULL)
+                       return nlm_lck_denied_nolocks;
+               block = nlmsvc_create_block(rqstp, host, file, lock, cookie);
                if (block == NULL) {
                        kfree(conf);
                        return nlm_granted;