cluster/afr: refactor

- Remove client side self-healing completely (opendir, openfd, lookup)
- Re-work readdir-failover to work reliably in case of NFS
- Remove unused/dead lock recovery code
- Consistently use xdata in both calls and callbacks in all FOPs
- Per-inode event generation, used to force inode ctx refresh
- Implement dirty flag support (in place of pending counts)
- Eliminate inode ctx structure, use read subvol bits + event_generation
- Implement inode ctx refreshing based on event generation
- Provide backward compatibility in transactions
- remove unused variables and functions
- make code more consistent in style and pattern
- regularize and clean up inode-write transaction code
- regularize and clean up dir-write transaction code
- regularize and clean up common FOPs
- reorganize transaction framework code
- skip setting xattrs in pending dict if nothing is pending
- re-write self-healing code using syncops
- re-write simpler self-heal-daemon

Change-Id: I1e4080c9796c8a2815c2dab4be3073f389d614a8
BUG: 1021686
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/6010
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 51 insertions, 44 deletions

diff --git a/xlators/cluster/afr/src/afr-self-heald.h b/xlators/cluster/afr/src/afr-self-heald.h
index e0c083754..10e229ee7 100644
--- a/xlators/cluster/afr/src/afr-self-heald.h
+++ b/xlators/cluster/afr/src/afr-self-heald.h
@@ -1,5 +1,5 @@
 /*
-  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  Copyright (c) 2013 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
@@ -8,58 +8,65 @@
   cases as published by the Free Software Foundation.
 */
 
-#ifndef __AFR_SELF_HEALD_H__
-#define __AFR_SELF_HEALD_H__
-#include "xlator.h"
-
-#define IS_ROOT_PATH(path) (!strcmp (path, "/"))
-#define IS_ENTRY_CWD(entry) (!strcmp (entry, "."))
-#define IS_ENTRY_PARENT(entry) (!strcmp (entry, ".."))
-#define AFR_ALL_CHILDREN -1
-
-typedef struct afr_crawl_data_ {
-        int                 child;
-        pid_t               pid;
-        afr_crawl_type_t    crawl;
-        xlator_t            *readdir_xl;
-        void                *op_data;
-        int                 crawl_flags;
-        int (*process_entry) (xlator_t *this, struct afr_crawl_data_ *crawl_data,
-                              gf_dirent_t *entry, loc_t *child, loc_t *parent,
-                              struct iatt *iattr);
-} afr_crawl_data_t;
-
-typedef struct crawl_event_stats_ {
-        uint64_t healed_count;
+
+#ifndef _AFR_SELF_HEALD_H
+#define _AFR_SELF_HEALD_H
+
+#include <pthread.h>
+
+
+typedef struct {
+	int child;
+	char *path;
+} shd_event_t;
+
+typedef struct {
+	int      child;
+	uint64_t healed_count;
         uint64_t split_brain_count;
         uint64_t heal_failed_count;
-        char     *start_time_str;
-        char     *end_time_str;
+
+	/* If start_time is 0, it means crawler is not in progress
+	   and stats are not valid */
+	time_t   start_time;
+	/* If start_time is NOT 0 and end_time is 0, it means
+	   cralwer is in progress */
+        time_t   end_time;
         char     *crawl_type;
-        gf_boolean_t crawl_inprogress;
-} shd_crawl_event_t;
+} crawl_event_t;
 
-void _destroy_crawl_event_data (void *data);
-void _destroy_shd_event_data (void *data);
+struct subvol_healer {
+	xlator_t        *this;
+	int              subvol;
+	gf_boolean_t     local;
+	gf_boolean_t     running;
+	gf_boolean_t     rerun;
+	crawl_event_t    crawl_event;
+	pthread_mutex_t  mutex;
+	pthread_cond_t   cond;
+	pthread_t        thread;
+};
 
-typedef int (*process_entry_cbk_t) (xlator_t *this, afr_crawl_data_t *crawl_data,
-                              gf_dirent_t *entry, loc_t *child, loc_t *parent,
-                              struct iatt *iattr);
+typedef struct {
+	gf_boolean_t            iamshd;
+	gf_boolean_t            enabled;
+	struct subvol_healer   *index_healers;
+	struct subvol_healer   *full_healers;
 
-void afr_build_root_loc (xlator_t *this, loc_t *loc);
+	eh_t                    *healed;
+        eh_t                    *heal_failed;
+        eh_t                    *split_brain;
+        eh_t                    **statistics;
+} afr_self_heald_t;
 
-int afr_set_root_gfid (dict_t *dict);
 
-void
-afr_proactive_self_heal (void *data);
+int
+afr_selfheal_childup (xlator_t *this, int subvol);
 
 int
-afr_xl_op (xlator_t *this, dict_t *input, dict_t *output);
+afr_selfheal_daemon_init (xlator_t *this);
 
-/*
- * In addition to its self-heal use, this is used to find a local default
- * read_child.
- */
 int
-afr_local_pathinfo (char *pathinfo, gf_boolean_t *local);
-#endif /* __AFR_SELF_HEALD_H__ */
+afr_xl_op (xlator_t *this, dict_t *input, dict_t *output);
+
+#endif /* !_AFR_SELF_HEALD_H */