protect fd_ctx get/set in afr_transaction and afr.c with locks

Signed-off-by: Anand V. Avati <avati@amp.gluster.com>

2 files changed, 31 insertions, 16 deletions

diff --git a/xlators/cluster/afr/src/afr-transaction.c b/xlators/cluster/afr/src/afr-transaction.c
index 3df9f07e..f9a0a880 100644
--- a/xlators/cluster/afr/src/afr-transaction.c
+++ b/xlators/cluster/afr/src/afr-transaction.c
@@ -67,20 +67,24 @@ __mark_all_success (int32_t *pending, int child_count)
 static int
 __is_first_write_on_fd (xlator_t *this, fd_t *fd)
 {
-	int op_ret     = 0;
-	int _ret       = -1;
-
-	_ret = fd_ctx_get (fd, this, NULL);
-	if (_ret < 0) {
-		gf_log (this->name, GF_LOG_DEBUG,
-			"first writev() on fd=%p, writing changelog",
-			fd);
-
-		_ret = fd_ctx_set (fd, this, 0xaf1);
-		op_ret = 1;
-	}
-
-	return op_ret;
+        int op_ret     = 0;
+        int _ret       = -1;
+
+        LOCK (&fd->inode->lock);
+        {
+                _ret = fd_ctx_get (fd, this, NULL);
+                if (_ret < 0) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "first writev() on fd=%p, writing changelog",
+                                fd);
+
+                        _ret = fd_ctx_set (fd, this, 0xaf1);
+                        op_ret = 1;
+                }
+        }
+        UNLOCK (&fd->inode->lock);
+
+        return op_ret;
 }
 
 
diff --git a/xlators/cluster/afr/src/afr.c b/xlators/cluster/afr/src/afr.c
index 1be016a3..e627da1f 100644
--- a/xlators/cluster/afr/src/afr.c
+++ b/xlators/cluster/afr/src/afr.c
@@ -816,6 +816,8 @@ afr_flush (call_frame_t *frame, xlator_t *this, fd_t *fd)
 	int op_ret   = -1;
 	int op_errno = 0;
 
+        int transaction_needed = 0;
+
 	VALIDATE_OR_GOTO (frame, out);
 	VALIDATE_OR_GOTO (this, out);
 	VALIDATE_OR_GOTO (this->private, out);
@@ -832,9 +834,18 @@ afr_flush (call_frame_t *frame, xlator_t *this, fd_t *fd)
 
 	frame->local = local;
 
-	if (__is_fd_ctx_set (this, fd)) {
-               fd_ctx_del (fd, this, NULL);
+        LOCK (&fd->inode->lock);
+        {
+                if (__is_fd_ctx_set (this, fd)) {
+                        transaction_needed = 1;
+                        fd_ctx_del (fd, this, NULL);
+                } else {
+                        transaction_needed = 0;
+                }
+        }
+        UNLOCK (&fd->inode->lock);
 
+        if (transaction_needed) {
 		local->op = GF_FOP_FLUSH;
 		local->transaction.fop    = afr_flush_wind;
 		local->transaction.done   = afr_flush_done;