cluster/ec: Add self-heal-daemon command handlers

This patch introduces the changes required in ec xlator to handle
index/full heal.

Index healer threads:
Ec xlator start an index healer thread per local brick. This thread keeps
waking up every minute to check if there are any files to be healed based on
the indices kept in index directory. Whenever child_up event comes, then also
this index healer thread wakes up and crawls the indices and triggers heal.
When self-heal-daemon is disabled on this particular volume then the healer
thread keeps waiting until it is enabled again to perform heals.

Full healer threads:
Ec xlator starts a full healer thread for the local subvolume provided by
glusterd to perform full crawl on the directory hierarchy to perform heals.
Once the crawl completes the thread exits if no more full heals are issued.

Changed xl-op prefix GF_AFR_OP to GF_SHD_OP to make it more generic.

Change-Id: Idf9b2735d779a6253717be064173dfde6f8f824b
BUG: 1177601
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/9787
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/xlators/cluster/ec/src/ec-heald.h b/xlators/cluster/ec/src/ec-heald.h
new file mode 100644
index 00000000000..0f27a8ec776
--- /dev/null
+++ b/xlators/cluster/ec/src/ec-heald.h
@@ -0,0 +1,47 @@
+/*
+  Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __EC_HEALD_H__
+#define __EC_HEALD_H__
+
+#include "xlator.h"
+
+struct _ec;
+typedef struct _ec ec_t;
+
+struct subvol_healer {
+        xlator_t        *this;
+        int              subvol;
+        gf_boolean_t     local;
+        gf_boolean_t     running;
+        gf_boolean_t     rerun;
+        pthread_mutex_t  mutex;
+        pthread_cond_t   cond;
+        pthread_t        thread;
+};
+
+struct _ec_self_heald;
+typedef struct _ec_self_heald ec_self_heald_t;
+
+struct _ec_self_heald {
+        gf_boolean_t            iamshd;
+        gf_boolean_t            enabled;
+        int                     timeout;
+        struct subvol_healer   *index_healers;
+        struct subvol_healer   *full_healers;
+};
+
+int
+ec_xl_op (xlator_t *this, dict_t *input, dict_t *output);
+
+int
+ec_selfheal_daemon_init (xlator_t *this);
+void ec_selfheal_childup (ec_t *ec, int child);
+#endif /* __EC_HEALD_H__ */