features/locks: Implement release xlator callback.

This patch solves the lock bailout problem seen recently when autoconf tools were run. This is a workaround,
where 'flock' locks are removed in pl_release, if an explicit UNLCK call does not come. The complete fix would
be to allow 'fcntl' and 'flock' locks to operate in different domains.

Signed-off-by: Pavan Vilas Sondur <pavan@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 449 (Handle flock calls in a different domain from fcntl calls)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=449

4 files changed, 48 insertions, 10 deletions

diff --git a/xlators/features/locks/src/common.c b/xlators/features/locks/src/common.c
index 7cbf45958..d82e47aa3 100644
--- a/xlators/features/locks/src/common.c
+++ b/xlators/features/locks/src/common.c
@@ -96,6 +96,11 @@ found:
         return dom;
 }
 
+unsigned long
+fd_to_fdnum (fd_t *fd)
+{
+        return ((unsigned long) fd);
+}
 
 int
 __pl_inode_is_empty (pl_inode_t *pl_inode)
@@ -444,7 +449,7 @@ new_posix_lock (struct flock *flock, transport_t *transport, pid_t client_pid,
 		lock->fl_end = flock->l_start + flock->l_len - 1;
 
 	lock->transport  = transport;
-        lock->fd         = fd;
+        lock->fd_num     = fd_to_fdnum (fd);
 	lock->client_pid = client_pid;
         lock->owner      = owner;
 
@@ -688,7 +693,7 @@ __insert_and_merge (pl_inode_t *pl_inode, posix_lock_t *lock)
 
                                 sum->fl_type    = lock->fl_type;
                                 sum->transport  = lock->transport;
-                                sum->fd         = lock->fd;
+                                sum->fd_num     = lock->fd_num;
                                 sum->client_pid = lock->client_pid;
                                 sum->owner      = lock->owner;
 
@@ -704,7 +709,7 @@ __insert_and_merge (pl_inode_t *pl_inode, posix_lock_t *lock)
 
                                 sum->fl_type    = conf->fl_type;
                                 sum->transport  = conf->transport;
-                                sum->fd         = conf->fd;
+                                sum->fd_num     = conf->fd_num;
                                 sum->client_pid = conf->client_pid;
                                 sum->owner      = conf->owner;
 
diff --git a/xlators/features/locks/src/common.h b/xlators/features/locks/src/common.h
index 32c27c7d1..46da9e78c 100644
--- a/xlators/features/locks/src/common.h
+++ b/xlators/features/locks/src/common.h
@@ -110,4 +110,7 @@ pl_print_locker (char *str, int size, xlator_t *this, call_frame_t *frame);
 void
 pl_print_inodelk (char *str, int size, int cmd, struct flock *flock, const char *domain);
 
+unsigned long
+fd_to_fdnum (fd_t *fd);
+
 #endif /* __COMMON_H__ */
diff --git a/xlators/features/locks/src/locks.h b/xlators/features/locks/src/locks.h
index 7dc8e2d4f..e89092811 100644
--- a/xlators/features/locks/src/locks.h
+++ b/xlators/features/locks/src/locks.h
@@ -42,7 +42,7 @@ struct __posix_lock {
         short              blocked;    /* waiting to acquire */
         struct flock       user_flock; /* the flock supplied by the user */
         xlator_t          *this;       /* required for blocked locks */
-        fd_t              *fd;
+        unsigned long      fd_num;
 
         call_frame_t      *frame;
 
diff --git a/xlators/features/locks/src/posix.c b/xlators/features/locks/src/posix.c
index 4a1a2a763..d4e1b152f 100644
--- a/xlators/features/locks/src/posix.c
+++ b/xlators/features/locks/src/posix.c
@@ -248,7 +248,7 @@ delete_locks_of_fd (xlator_t *this, pl_inode_t *pl_inode, fd_t *fd)
        {
 
                list_for_each_entry_safe (l, tmp, &pl_inode->ext_list, list) {
-                       if ((l->fd == fd)) {
+                       if ((l->fd_num == fd_to_fdnum(fd))) {
                                if (l->blocked) {
                                        list_move_tail (&l->list, &blocked_list);
                                        continue;
@@ -368,6 +368,14 @@ int
 pl_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
              int32_t op_ret, int32_t op_errno, fd_t *fd)
 {
+        int dummy = 1;
+        int ret = -1;
+
+        ret = fd_ctx_set (fd, this, dummy);
+        if (ret != 0)
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "fd_ctx_set failed");
+
         STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd);
 
         return 0;
@@ -517,7 +525,7 @@ pl_readv (call_frame_t *frame, xlator_t *this,
                 region.fl_start   = offset;
                 region.fl_end     = offset + size - 1;
                 region.transport  = frame->root->trans;
-                region.fd         = fd;
+                region.fd_num     = fd_to_fdnum(fd);
                 region.client_pid = frame->root->pid;
                 region.owner      = frame->root->lk_owner;
 
@@ -614,7 +622,7 @@ pl_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
                 region.fl_start   = offset;
                 region.fl_end     = offset + iov_length (vector, count) - 1;
                 region.transport  = frame->root->trans;
-                region.fd         = fd;
+                region.fd_num     = fd_to_fdnum(fd);
                 region.client_pid = frame->root->pid;
                 region.owner      = frame->root->lk_owner;
 
@@ -736,9 +744,9 @@ pl_lk (call_frame_t *frame, xlator_t *this,
 #endif
         case F_SETLKW:
                 can_block = 1;
-                reqlock->frame = frame;
-                reqlock->this  = this;
-                reqlock->fd    = fd;
+                reqlock->frame  = frame;
+                reqlock->this   = this;
+                reqlock->fd_num = fd_to_fdnum(fd);
 
                 /* fall through */
 
@@ -859,6 +867,27 @@ pl_forget (xlator_t *this,
         return 0;
 }
 
+int
+pl_release (xlator_t *this, fd_t *fd)
+{
+        pl_inode_t *pl_inode     = NULL;
+        uint64_t    tmp_pl_inode = 0;
+        int         ret          = -1;
+
+	ret = inode_ctx_get (fd->inode, this, &tmp_pl_inode);
+        if (ret != 0)
+                goto out;
+
+        pl_inode = (pl_inode_t *)(long)tmp_pl_inode;
+
+        gf_log (this->name, GF_LOG_TRACE,
+                "Releasing all locks with fd %p", fd);
+
+        delete_locks_of_fd (this, pl_inode, fd);
+
+out:
+        return ret;
+}
 static int32_t
 __get_posixlk_count (xlator_t *this, pl_inode_t *pl_inode)
 {
@@ -1420,6 +1449,7 @@ struct xlator_dumpops dumpops = {
 
 struct xlator_cbks cbks = {
         .forget      = pl_forget,
+        .release     = pl_release,
 };