cluster/ec: Do not start heal on good file while IO is going on

Problem:
Write on a file has been slowed down significantly after
http://review.gluster.org/#/c/13733/

RC : When update fop starts on a file, it sets dirty flag at
the start and remove it at the end which make an index entry
in indices/xattrop. During IO, SHD scans this and finds out
an index and starts heal even if all the fragments are healthy
and up tp date. This heal takes inodelk for different types of
heal. If the IO is for long time this will happen in every 60 seconds.
Due to this extra, unneccessary locking, IO gets slowed down.

Solution:
Before starting  any  type of heal check if file needs heal or not.

> Change-Id: Ib9519a43e7e4b2565d3f3153f9ca0fb92174fe51
> BUG: 1409191
> Signed-off-by: Ashish Pandey <aspandey@redhat.com>
> Reviewed-on: http://review.gluster.org/16377
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
> Reviewed-by: Xavier Hernandez <xhernandez@datalab.es>

Change-Id: I1a66aca626156164555a7a99a4f715c54c87e9a9
BUG: 1419825
Signed-off-by: Ashish Pandey <aspandey@redhat.com>
Reviewed-on: https://review.gluster.org/16552
Tested-by: Xavier Hernandez <xhernandez@datalab.es>
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

2 files changed, 41 insertions, 4 deletions

diff --git a/xlators/cluster/ec/src/ec-common.h b/xlators/cluster/ec/src/ec-common.h
index e3fc3cef075..c532e0e03b0 100644
--- a/xlators/cluster/ec/src/ec-common.h
+++ b/xlators/cluster/ec/src/ec-common.h
@@ -119,6 +119,10 @@ gf_boolean_t ec_is_recoverable_error (int32_t op_errno);
 void ec_handle_healers_done (ec_fop_data_t *fop);
 
 int32_t
+ec_heal_inspect (call_frame_t *frame, ec_t *ec,
+                 inode_t *inode, unsigned char *locked_on,
+                 gf_boolean_t *need_heal);
+int32_t
 ec_get_heal_info (xlator_t *this, loc_t *loc, dict_t **dict);
 
 #endif /* __EC_COMMON_H__ */
diff --git a/xlators/cluster/ec/src/ec-heal.c b/xlators/cluster/ec/src/ec-heal.c
index 1859d73d12b..548649b9a35 100644
--- a/xlators/cluster/ec/src/ec-heal.c
+++ b/xlators/cluster/ec/src/ec-heal.c
@@ -2332,6 +2332,8 @@ ec_heal_do (xlator_t *this, void *data, loc_t *loc, int32_t partial)
         intptr_t      bad            = 0;
         ec_fop_data_t *fop           = data;
         gf_boolean_t  blocking       = _gf_false;
+        gf_boolean_t  need_heal      = _gf_false;
+        unsigned char *up_subvols    = NULL;
 
         ec = this->private;
 
@@ -2353,6 +2355,19 @@ ec_heal_do (xlator_t *this, void *data, loc_t *loc, int32_t partial)
         frame->root->pid = GF_CLIENT_PID_SELF_HEALD;
         participants = alloca0(ec->nodes);
         ec_mask_to_char_array (ec->xl_up, participants, ec->nodes);
+
+        up_subvols = alloca0(ec->nodes);
+        ec_mask_to_char_array (ec->xl_up, up_subvols, ec->nodes);
+
+        ec_heal_inspect (frame, ec, loc->inode, up_subvols,
+                         &need_heal);
+        if (!need_heal) {
+                gf_msg (ec->xl->name, GF_LOG_DEBUG, 0,
+                        EC_MSG_HEAL_FAIL, "Heal is not required for : %s ",
+                        uuid_utoa(loc->gfid));
+                goto out;
+        }
+
         if (loc->name && strlen (loc->name)) {
                 ret = ec_heal_name (frame, ec, loc->parent, (char *)loc->name,
                                     participants);
@@ -2401,7 +2416,7 @@ ec_heal_do (xlator_t *this, void *data, loc_t *loc, int32_t partial)
                 op_errno = -ret;
         }
 
-
+out:
         if (fop->cbks.heal) {
                 fop->cbks.heal (fop->req_frame, fop, fop->xl, op_ret,
                                 op_errno, ec_char_array_to_mask (participants,
@@ -2665,7 +2680,8 @@ out:
 }
 
 int32_t
-ec_need_heal (ec_t *ec, default_args_cbk_t *replies, gf_boolean_t *need_heal)
+ec_need_heal (ec_t *ec, default_args_cbk_t *replies,
+              gf_boolean_t *need_heal, int32_t lock_count)
 {
         uint64_t           *dirty         = NULL;
         unsigned char      *sources       = NULL;
@@ -2691,7 +2707,9 @@ ec_need_heal (ec_t *ec, default_args_cbk_t *replies, gf_boolean_t *need_heal)
                 goto out;
         }
         source_count = EC_COUNT (sources, ec->nodes);
-        if (source_count != ec->nodes) {
+        if (source_count == ec->nodes && lock_count > 0) {
+                *need_heal = _gf_false;
+        } else {
                 *need_heal = _gf_true;
         }
         ret = source_count;
@@ -2705,12 +2723,14 @@ ec_heal_inspect (call_frame_t *frame, ec_t *ec,
                  gf_boolean_t *need_heal)
 {
         loc_t              loc           = {0};
+        int                i             = 0;
         int                ret           = 0;
         dict_t             *xdata        = NULL;
         uint64_t           zero_array[2] = {0};
         uint64_t           zero_value    = 0;
         unsigned char      *output       = NULL;
         default_args_cbk_t *replies      = NULL;
+        int32_t            lock_count    = 0;
 
         EC_REPLIES_ALLOC (replies, ec->nodes);
         output = alloca0 (ec->nodes);
@@ -2720,6 +2740,8 @@ ec_heal_inspect (call_frame_t *frame, ec_t *ec,
 
         xdata = dict_new ();
         if (!xdata ||
+            dict_set_str(xdata, GLUSTERFS_INODELK_DOM_COUNT,
+                         ec->xl->name) ||
             dict_set_static_bin (xdata, EC_XATTR_VERSION, zero_array,
                                  sizeof (zero_array)) ||
             dict_set_static_bin (xdata, EC_XATTR_DIRTY, zero_array,
@@ -2731,12 +2753,23 @@ ec_heal_inspect (call_frame_t *frame, ec_t *ec,
         }
         ret = cluster_lookup (ec->xl_list, locked_on, ec->nodes, replies,
                               output, frame, ec->xl, &loc, xdata);
+
         if (ret != ec->nodes) {
                 ret = ec->nodes;
                 *need_heal = _gf_true;
                 goto out;
         }
-        ret = ec_need_heal (ec, replies, need_heal);
+
+        for (i = 0; i < ec->nodes; i++) {
+                if (!output[i] || !replies[i].xdata) {
+                        continue;
+                }
+                if ((dict_get_int32 (replies[i].xdata, GLUSTERFS_INODELK_COUNT,
+                                     &lock_count) == 0) && lock_count > 0) {
+                        break;
+                }
+        }
+        ret = ec_need_heal (ec, replies, need_heal, lock_count);
 
 out:
         cluster_replies_wipe (replies, ec->nodes);