features/index: Delete granular entry indices of already healed directories during crawl

        Backport of: http://review.gluster.org/15880

If granular name indices are already in existence for a volume, and
before they are healed, granular entry heal be disabled, a crawl on
indices/xattrop will clear the changelogs on these directories. When
their corresponding entry-changes indices are crawled subsequently,
if it is found that the directories don't need heal anymore, the
granular indices are not cleaned up.
This patch fixes that problem by ensuring that the zero-xattrop
also deletes the stale indices at the level of index translator.

Change-Id: If4a2f14e33a78f2217e9fea8733ebb552af56059
BUG: 1398500
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: http://review.gluster.org/15926
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>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

1 files changed, 21 insertions, 2 deletions

diff --git a/xlators/features/index/src/index.c b/xlators/features/index/src/index.c
index 75809e36e4c..099a591ac0e 100644
--- a/xlators/features/index/src/index.c
+++ b/xlators/features/index/src/index.c
@@ -655,6 +655,8 @@ index_del (xlator_t *this, uuid_t gfid, const char *subdir, int type)
         index_priv_t *priv = NULL;
         int          ret = 0;
         char         gfid_path[PATH_MAX] = {0};
+        char         rename_dst[PATH_MAX] = {0,};
+        uuid_t uuid;
 
         priv = this->private;
         GF_ASSERT_AND_GOTO_WITH_ERROR (this->name, !gf_uuid_is_null (gfid),
@@ -662,10 +664,27 @@ index_del (xlator_t *this, uuid_t gfid, const char *subdir, int type)
         make_gfid_path (priv->index_basepath, subdir, gfid,
                         gfid_path, sizeof (gfid_path));
 
-        if ((strcmp (subdir, ENTRY_CHANGES_SUBDIR)) == 0)
+        if ((strcmp (subdir, ENTRY_CHANGES_SUBDIR)) == 0) {
                 ret = sys_rmdir (gfid_path);
-        else
+                /* rmdir above could fail with ENOTEMPTY if the indices under
+                 * it were created when granular-entry-heal was enabled, whereas
+                 * the actual heal that happened was non-granular (or full) in
+                 * nature, resulting in name indices getting left out. To
+                 * clean up this directory without it affecting the IO path perf,
+                 * the directory is renamed to a unique name under
+                 * indices/entry-changes. Self-heal will pick up this entry
+                 * during crawl and on lookup into the file system figure that
+                 * the index is stale and subsequently wipe it out using rmdir().
+                 */
+                if ((ret) && (errno == ENOTEMPTY)) {
+                        gf_uuid_generate (uuid);
+                        make_gfid_path (priv->index_basepath, subdir, uuid,
+                                        rename_dst, sizeof (rename_dst));
+                        ret = sys_rename (gfid_path, rename_dst);
+                }
+        } else {
                 ret = sys_unlink (gfid_path);
+        }
 
         if (ret && (errno != ENOENT)) {
                 gf_msg (this->name, GF_LOG_ERROR, errno,