features/index: Choose different base file on EMLINK error

Change-Id: I4648816af908539efdc2528608aa2ebf7f0d0e2f
fixes: bz#1565655
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
(cherry picked from commit bb12f2109a01856e8184e13cf984210d20155b13)

2 files changed, 61 insertions, 18 deletions

diff --git a/tests/bugs/index/bug-1559004-EMLINK-handling.t b/tests/bugs/index/bug-1559004-EMLINK-handling.t
new file mode 100644
index 00000000000..9aff93a367f
--- /dev/null
+++ b/tests/bugs/index/bug-1559004-EMLINK-handling.t
@@ -0,0 +1,52 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../afr.rc
+
+cleanup
+TESTS_EXPECTED_IN_LOOP=30
+SCRIPT_TIMEOUT=1000
+
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume info
+
+TEST touch $B0/ext4-1
+TEST touch $B0/ext4-2
+TEST touch $B0/ext4-3
+TEST truncate -s 2GB $B0/ext4-1
+TEST truncate -s 2GB $B0/ext4-2
+TEST truncate -s 2GB $B0/ext4-3
+
+TEST mkfs.ext4 -F $B0/ext4-1
+TEST mkfs.ext4 -F $B0/ext4-2
+TEST mkfs.ext4 -F $B0/ext4-3
+TEST mkdir $B0/ext41
+TEST mkdir $B0/ext42
+TEST mkdir $B0/ext43
+TEST mount -t ext4 -o loop $B0/ext4-1 $B0/ext41
+TEST mount -t ext4 -o loop $B0/ext4-2 $B0/ext42
+TEST mount -t ext4 -o loop $B0/ext4-3 $B0/ext43
+
+TEST $CLI volume create $V0 replica 3 $H0:$B0/ext4{1,2,3}
+TEST $CLI volume start $V0
+TEST $CLI volume heal $V0 granular-entry-heal enable
+TEST $GFS --volfile-id=$V0 --volfile-server=$H0 $M0;
+TEST kill_brick $V0 $H0 $B0/ext41
+for i in {1..15}
+do
+        TEST_IN_LOOP mkdir $M0/d${i}
+        TEST_IN_LOOP touch $M0/d${i}/{1..5000}
+done
+
+#On ext4 max number of hardlinks is ~65k, so there should be 2 base index files
+EXPECT "^2$" echo $(ls $B0/ext42/.glusterfs/indices/xattrop | grep xattrop | wc -l)
+EXPECT "^2$" echo $(ls $B0/ext42/.glusterfs/indices/entry-changes | grep entry-changes | wc -l)
+
+#Number of hardlinks: 75000 for files, 15 for dirs and 2 for base-indices
+#and root-dir for xattrop
+EXPECT "75018" echo $(ls -l $B0/ext42/.glusterfs/indices/xattrop | grep xattrop | awk '{sum+=$2} END{print sum}')
+EXPECT "75017" echo $(ls -l $B0/ext42/.glusterfs/indices/entry-changes | grep entry-changes | awk '{sum+=$2} END{print sum}')
+
+cleanup
diff --git a/xlators/features/index/src/index.c b/xlators/features/index/src/index.c
index f3b02706cdd..ac04f3c43d6 100644
--- a/xlators/features/index/src/index.c
+++ b/xlators/features/index/src/index.c
@@ -573,14 +573,18 @@ out:
 }
 
 int
-index_link_to_base (xlator_t *this, char *base, size_t base_len,
-                    char *fpath, const char *subdir)
+index_link_to_base (xlator_t *this, char *fpath, const char *subdir)
 {
         int ret = 0;
         int fd  = 0;
         int op_errno = 0;
         uuid_t index = {0};
         index_priv_t *priv = this->private;
+        char         base[PATH_MAX] = {0};
+
+        index_get_index (priv, index);
+        make_index_path (priv->index_basepath, subdir,
+                         index, base, sizeof (base));
 
         ret = sys_link (base, fpath);
         if (!ret || (errno == EEXIST))  {
@@ -598,7 +602,7 @@ index_link_to_base (xlator_t *this, char *base, size_t base_len,
         } else if (op_errno == EMLINK) {
                 index_generate_index (priv, index);
                 make_index_path (priv->index_basepath, subdir,
-                                 index, base, base_len);
+                                 index, base, sizeof (base));
         } else {
                 goto out;
         }
@@ -633,9 +637,7 @@ index_add (xlator_t *this, uuid_t gfid, const char *subdir,
            index_xattrop_type_t type)
 {
         char              gfid_path[PATH_MAX] = {0};
-        char              index_path[PATH_MAX] = {0};
         int               ret = -1;
-        uuid_t            index = {0};
         index_priv_t      *priv = NULL;
         struct stat       st = {0};
 
@@ -652,11 +654,7 @@ index_add (xlator_t *this, uuid_t gfid, const char *subdir,
         ret = sys_stat (gfid_path, &st);
         if (!ret)
                 goto out;
-        index_get_index (priv, index);
-        make_index_path (priv->index_basepath, subdir,
-                         index, index_path, sizeof (index_path));
-        ret = index_link_to_base (this, index_path, sizeof (index_path),
-                                  gfid_path, subdir);
+        ret = index_link_to_base (this, gfid_path, subdir);
 out:
         return ret;
 }
@@ -809,8 +807,6 @@ index_entry_create (xlator_t *this, inode_t *inode, char *filename)
         int                 op_errno                        = 0;
         char                pgfid_path[PATH_MAX]            = {0};
         char                entry_path[PATH_MAX]            = {0};
-        char                entry_base_index_path[PATH_MAX] = {0};
-        uuid_t              index                           = {0};
         index_priv_t       *priv                            = NULL;
         index_inode_ctx_t  *ctx                             = NULL;
 
@@ -848,12 +844,7 @@ index_entry_create (xlator_t *this, inode_t *inode, char *filename)
 
         snprintf (entry_path, sizeof(entry_path), "%s/%s", pgfid_path,
                   filename);
-        index_get_index (priv, index);
-        make_index_path (priv->index_basepath, ENTRY_CHANGES_SUBDIR, index,
-                         entry_base_index_path, sizeof(entry_base_index_path));
-        ret = index_link_to_base (this, entry_base_index_path,
-                                  sizeof (entry_base_index_path),
-                                  entry_path, ENTRY_CHANGES_SUBDIR);
+        ret = index_link_to_base (this, entry_path, ENTRY_CHANGES_SUBDIR);
 out:
         if (op_errno)
                 ret = -op_errno;