posix: Implement a janitor thread to close fd

Problem: In the commit fb20713b380e1df8d7f9e9df96563be2f9144fd6 we use
         syntask to close fd but we have found the patch is reducing the
         performance

Solution: Use janitor thread to close fd's and save the pfd ctx into
          ctx janitor list and also save the posix_xlator into pfd object to
          avoid the race condition during cleanup in brick_mux environment

Change-Id: Ifb3d18a854b267333a3a9e39845bfefb83fbc092
Fixes: #1396
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/libglusterfs/src/glusterfs/glusterfs.h b/libglusterfs/src/glusterfs/glusterfs.h
index e4dfda8d01..fc69ad0b74 100644
--- a/libglusterfs/src/glusterfs/glusterfs.h
+++ b/libglusterfs/src/glusterfs/glusterfs.h
@@ -730,6 +730,13 @@ struct _glusterfs_ctx {
     } stats;
 
     struct list_head volfile_list;
+    /* Add members to manage janitor threads for cleanup fd */
+    struct list_head janitor_fds;
+    pthread_cond_t fd_cond;
+    pthread_mutex_t fd_lock;
+    pthread_t janitor;
+    /* The variable is use to save total posix xlator count */
+    uint32_t pxl_count;
 
     char volume_id[GF_UUID_BUF_SIZE]; /* Used only in protocol/client */
 };