features/trash : Notify CTR translator if an unlink happens to a file

        Backport of http://review.gluster.org/#/c/9989/

This implementation is same as the posix_unlink_cbk() where CTR sends
a request during a unlink to send the number of links to the inode
and posix obliges sending it using the unwind xdata dict.
For Trash xlator a unlink is stat + mkdir(if parent is not present)
+ rename. And hence this is handled in trash_unlink_rename_cbk().

Change-Id: I402e83567b88e3c9fe171379693c82937af567f9
BUG: 1218032
Signed-off-by: Jiffin Tony Thottan <jthottan@redhat.com>
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Signed-off-by: Anoop C S <achiraya@redhat.com>
Reviewed-on: http://review.gluster.org/10513
Reviewed-by: Joseph Fernandes
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Dan Lambright <dlambrig@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

2 files changed, 66 insertions, 0 deletions

diff --git a/xlators/features/trash/src/trash.c b/xlators/features/trash/src/trash.c
index 5cc051004b4..dafeb183f87 100644
--- a/xlators/features/trash/src/trash.c
+++ b/xlators/features/trash/src/trash.c
@@ -750,6 +750,7 @@ trash_unlink_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         char               *dir_name           = NULL;
         char               *tmp_cookie         = NULL;
         loc_t              tmp_loc             = {0,};
+        dict_t             *new_xdata          = NULL;
         char               *tmp_stat           = NULL;
         char               real_path[PATH_MAX] = {0,};
         int                ret                 = 0;
@@ -829,6 +830,58 @@ trash_unlink_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
+        /**********************************************************************
+         *
+         * CTR Xlator message handling done here!
+         *
+         **********************************************************************/
+        /**
+         * If unlink is handled by trash translator, it should inform the
+         * CTR Xlator. And trash translator only handles the unlink for
+         * the last hardlink.
+         *
+         * Check if there is a CTR_REQUEST_LINK_COUNT_XDATA from CTR Xlator
+         *
+         */
+
+        if (local->ctr_link_count_req) {
+
+                /* Sending back inode link count to ctr_unlink
+                 * (changetimerecoder xlator) via
+                 * "CTR_RESPONSE_LINK_COUNT_XDATA" key using xdata.
+                 * */
+                if (xdata) {
+                        ret = dict_set_uint32 (xdata,
+                                               CTR_RESPONSE_LINK_COUNT_XDATA,
+                                               1);
+                        if (ret == -1) {
+                                gf_log (this->name, GF_LOG_WARNING,
+                                        "Failed to set"
+                                        " CTR_RESPONSE_LINK_COUNT_XDATA");
+                        }
+                } else {
+                        new_xdata = dict_new ();
+                        if (!new_xdata) {
+                                gf_log (this->name, GF_LOG_WARNING,
+                                        "Memory allocation failure while "
+                                        "creating new_xdata");
+                                goto ctr_out;
+                        }
+                        ret = dict_set_uint32 (new_xdata,
+                                               CTR_RESPONSE_LINK_COUNT_XDATA,
+                                               1);
+                        if (ret == -1) {
+                                gf_log (this->name, GF_LOG_WARNING,
+                                        "Failed to set"
+                                        " CTR_RESPONSE_LINK_COUNT_XDATA");
+                        }
+ctr_out:
+                        TRASH_STACK_UNWIND (unlink, frame, 0, op_errno,
+                                            &local->preparent,
+                                            &local->postparent, new_xdata);
+                        goto out;
+                }
+         }
         /* All other cases, unlink should return success */
         TRASH_STACK_UNWIND (unlink, frame, 0, op_errno, &local->preparent,
                             &local->postparent, xdata);
@@ -837,6 +890,8 @@ out:
                 GF_FREE (tmp_str);
         if (tmp_cookie)
                 GF_FREE (tmp_cookie);
+        if (new_xdata)
+                dict_unref (new_xdata);
 
         return ret;
 }
@@ -938,6 +993,7 @@ trash_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflags,
         trash_private_t         *priv           = NULL;
         trash_local_t           *local          = NULL;/* files inside trash */
         int32_t                 match           = 0;
+        int32_t                 ctr_link_req    = 0;
         char                    *pathbuf        = NULL;
         int                     ret             = 0;
 
@@ -1034,6 +1090,15 @@ trash_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflags,
                 goto out;
         }
 
+        /* To know whether CTR xlator requested for the link count */
+        ret = dict_get_int32 (xdata, CTR_REQUEST_LINK_COUNT_XDATA,
+                              &ctr_link_req);
+        if (ret) {
+                local->ctr_link_count_req = _gf_false;
+                ret = 0;
+        } else
+                local->ctr_link_count_req = _gf_true;
+
         LOCK_INIT (&frame->lock);
 
         STACK_WIND (frame, trash_unlink_stat_cbk,
diff --git a/xlators/features/trash/src/trash.h b/xlators/features/trash/src/trash.h
index 3e03edf5474..37d8f7b3d85 100644
--- a/xlators/features/trash/src/trash.h
+++ b/xlators/features/trash/src/trash.h
@@ -50,6 +50,7 @@ struct trash_struct {
         int32_t  loop_count;
         struct iatt preparent;
         struct iatt postparent;
+        gf_boolean_t ctr_link_count_req;
 };
 typedef struct trash_struct trash_local_t;