performance/io-cache,quick-read: increase cache-size limit

Does the following:
1. Increases cache-size limit from 6GB to 32GB.
2. Prevents 'volume set'from failing when cache-size is set over the
limit. Just issues a warning.
3. Performs check on cache-size by comparing with total system memory
available in init () and reconfigure () methods.

Change-Id: I7dd4d8c53051b89a293696abf1ee8dc237e39a20
BUG: 3495
Reviewed-on: http://review.gluster.com/409
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amar@gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

1 files changed, 54 insertions, 5 deletions

diff --git a/xlators/performance/io-cache/src/io-cache.c b/xlators/performance/io-cache/src/io-cache.c
index 90c14ea7d6c..375004c9346 100644
--- a/xlators/performance/io-cache/src/io-cache.c
+++ b/xlators/performance/io-cache/src/io-cache.c
@@ -1514,13 +1514,50 @@ mem_acct_init (xlator_t *this)
 }
 
 
+gf_boolean_t
+check_cache_size_ok (xlator_t *this, uint64_t cache_size)
+{
+        gf_boolean_t            ret = _gf_true;
+        uint64_t                total_mem = 0;
+        uint64_t                max_cache_size = 0;
+        volume_option_t         *opt = NULL;
+
+        GF_ASSERT (this);
+        opt = xlator_volume_option_get (this, "cache-size");
+        if (!opt) {
+                ret = _gf_false;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "could not get cache-size option");
+                goto out;
+        }
+
+        total_mem = get_mem_size ();
+        if (-1 == total_mem)
+                max_cache_size = opt->max;
+        else
+                max_cache_size = total_mem;
+
+        gf_log (this->name, GF_LOG_INFO, "Max cache size is %"PRIu64,
+                max_cache_size);
+
+        if (cache_size > max_cache_size) {
+                ret = _gf_false;
+                gf_log (this->name, GF_LOG_ERROR, "Cache size %"PRIu64
+                        " is greater than the max size of %"PRIu64,
+                        cache_size, max_cache_size);
+                goto out;
+        }
+out:
+        return ret;
+}
+
 int
 reconfigure (xlator_t *this, dict_t *options)
 {
         data_t      *data              = NULL;
         ioc_table_t *table             = NULL;
         int          ret               = -1;
-
+        uint64_t      cache_size_new    = 0;
         if (!this || !this->private)
                 goto out;
 
@@ -1531,9 +1568,6 @@ reconfigure (xlator_t *this, dict_t *options)
                 GF_OPTION_RECONF ("cache-timeout", table->cache_timeout,
                                   options, int32, unlock);
 
-                GF_OPTION_RECONF ("cache-size", table->cache_size,
-                                  options, size, unlock);
-
                 data = dict_get (options, "priority");
                 if (data) {
                         char *option_list = data_to_str (data);
@@ -1566,6 +1600,16 @@ reconfigure (xlator_t *this, dict_t *options)
                         goto unlock;
                 }
 
+                GF_OPTION_RECONF ("cache-size", cache_size_new,
+                                  options, size, unlock);
+                if (!check_cache_size_ok (this, cache_size_new)) {
+                        ret = -1;
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Not reconfiguring cache-size");
+                        goto unlock;
+                }
+                table->cache_size = cache_size_new;
+
                 ret = 0;
         }
 unlock:
@@ -1621,6 +1665,11 @@ init (xlator_t *this)
 
         GF_OPTION_INIT ("max-file-size", table->max_file_size, size, out);
 
+        if  (!check_cache_size_ok (this, table->cache_size)) {
+                ret = -1;
+                goto out;
+        }
+
         INIT_LIST_HEAD (&table->priority_list);
         table->max_pri = 1;
         data = dict_get (xl_options, "priority");
@@ -1921,7 +1970,7 @@ struct volume_options options[] = {
         { .key  = {"cache-size"},
           .type = GF_OPTION_TYPE_SIZET,
           .min  = 4 * GF_UNIT_MB,
-          .max  = 6 * GF_UNIT_GB,
+          .max  = 32 * GF_UNIT_GB,
           .default_value = "32MB",
           .description = "Size of the read cache."
         },