diff --git a/src/core/ngx_open_file_cache.c b/src/core/ngx_open_file_cache.c
index a9c4532..a70385c 100644
--- a/src/core/ngx_open_file_cache.c
+++ b/src/core/ngx_open_file_cache.c
@@ -155,6 +155,7 @@
             of->uniq = ngx_file_uniq(&fi);
             of->mtime = ngx_file_mtime(&fi);
             of->size = ngx_file_size(&fi);
+            of->fs_size = ngx_file_fs_size(&fi);
             of->is_dir = ngx_is_dir(&fi);
             of->is_file = ngx_is_file(&fi);
             of->is_link = ngx_is_link(&fi);
@@ -557,6 +558,7 @@
     of->uniq = ngx_file_uniq(&fi);
     of->mtime = ngx_file_mtime(&fi);
     of->size = ngx_file_size(&fi);
+    of->fs_size = ngx_file_fs_size(&fi);
     of->is_dir = ngx_is_dir(&fi);
     of->is_file = ngx_is_file(&fi);
     of->is_link = ngx_is_link(&fi);
diff --git a/src/core/ngx_open_file_cache.h b/src/core/ngx_open_file_cache.h
index f56dfcc..638bc5d 100644
--- a/src/core/ngx_open_file_cache.h
+++ b/src/core/ngx_open_file_cache.h
@@ -20,6 +20,7 @@
     ngx_file_uniq_t          uniq;
     time_t                   mtime;
     off_t                    size;
+    off_t                    fs_size;
     off_t                    directio;
     size_t                   read_ahead;
 
diff --git a/src/http/ngx_http_cache.h b/src/http/ngx_http_cache.h
index b511a0b..3cf113f 100644
--- a/src/http/ngx_http_cache.h
+++ b/src/http/ngx_http_cache.h
@@ -50,7 +50,7 @@
     time_t                           expire;
     time_t                           valid_sec;
     size_t                           body_start;
-    off_t                            length;
+    off_t                            fs_size;
 } ngx_http_file_cache_node_t;
 
 
@@ -68,6 +68,7 @@
     size_t                           header_start;
     size_t                           body_start;
     off_t                            length;
+    off_t                            fs_size;
 
     ngx_uint_t                       min_uses;
     ngx_uint_t                       error;
diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index f26fcbc..fb1ab98 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -349,6 +349,7 @@
     c->file.log = r->connection->log;
     c->uniq = of.uniq;
     c->length = of.size;
+    c->fs_size = (of.fs_size + cache->bsize - 1) / cache->bsize;
 
     c->buf = ngx_create_temp_buf(r->pool, c->body_start);
     if (c->buf == NULL) {
@@ -411,7 +412,7 @@
             c->node->exists = 1;
             c->node->uniq = c->uniq;
 
-            cache->sh->size += (c->length + cache->bsize - 1) / cache->bsize;
+            cache->sh->size += c->fs_size;
         }
 
         ngx_shmtx_unlock(&cache->shpool->mutex);
@@ -594,7 +595,7 @@
     fcn->valid_sec = 0;
     fcn->uniq = 0;
     fcn->body_start = 0;
-    fcn->length = 0;
+    fcn->fs_size = 0;
 
 done:
 
@@ -777,7 +778,7 @@
 void
 ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf)
 {
-    off_t                   size, length;
+    off_t                   fs_size;
     ngx_int_t               rc;
     ngx_file_uniq_t         uniq;
     ngx_file_info_t         fi;
@@ -800,7 +801,7 @@
     cache = c->file_cache;
 
     uniq = 0;
-    length = 0;
+    fs_size = 0;
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http file cache rename: \"%s\" to \"%s\"",
@@ -825,23 +826,18 @@
 
         } else {
             uniq = ngx_file_uniq(&fi);
-            length = ngx_file_size(&fi);
+            fs_size = (ngx_file_fs_size(&fi) + cache->bsize - 1) / cache->bsize;
         }
     }
 
-    size = (length + cache->bsize - 1) / cache->bsize;
-
     ngx_shmtx_lock(&cache->shpool->mutex);
 
     c->node->count--;
     c->node->uniq = uniq;
     c->node->body_start = c->body_start;
 
-    size = size - (c->node->length + cache->bsize - 1) / cache->bsize;
-
-    c->node->length = length;
-
-    cache->sh->size += size;
+    cache->sh->size += fs_size - c->node->fs_size;
+    c->node->fs_size = fs_size;
 
     if (rc == NGX_OK) {
         c->node->exists = 1;
@@ -1148,7 +1144,7 @@
     fcn = ngx_queue_data(q, ngx_http_file_cache_node_t, queue);
 
     if (fcn->exists) {
-        cache->sh->size -= (fcn->length + cache->bsize - 1) / cache->bsize;
+        cache->sh->size -= fcn->fs_size;
 
         path = cache->path;
         p = name + path->name.len + 1 + path->len;
@@ -1371,6 +1367,8 @@
         return NGX_ERROR;
     }
 
+    cache = ctx->data;
+
     if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
         ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
                       ngx_fd_info_n " \"%s\" failed", name->data);
@@ -1381,6 +1379,7 @@
         c.valid_msec = h.valid_msec;
         c.body_start = h.body_start;
         c.length = ngx_file_size(&fi);
+        c.fs_size = (ngx_file_fs_size(&fi) + cache->bsize - 1) / cache->bsize;
     }
 
     if (ngx_close_file(fd) == NGX_FILE_ERROR) {
@@ -1406,8 +1405,6 @@
         c.key[i] = (u_char) n;
     }
 
-    cache = ctx->data;
-
     return ngx_http_file_cache_add(cache, &c);
 }
 
@@ -1447,9 +1444,9 @@
         fcn->uniq = c->uniq;
         fcn->valid_sec = c->valid_sec;
         fcn->body_start = c->body_start;
-        fcn->length = c->length;
+        fcn->fs_size = c->fs_size;
 
-        cache->sh->size += (c->length + cache->bsize - 1) / cache->bsize;
+        cache->sh->size += c->fs_size;
 
     } else {
         ngx_queue_remove(&fcn->queue);
diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index b7bfff1..037c9a1 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -157,6 +157,7 @@
 #define ngx_is_exec(sb)          (((sb)->st_mode & S_IXUSR) == S_IXUSR)
 #define ngx_file_access(sb)      ((sb)->st_mode & 0777)
 #define ngx_file_size(sb)        (sb)->st_size
+#define ngx_file_fs_size(sb)     ((sb)->st_blocks * 512)
 #define ngx_file_mtime(sb)       (sb)->st_mtime
 #define ngx_file_uniq(sb)        (sb)->st_ino
 
diff --git a/src/os/win32/ngx_files.h b/src/os/win32/ngx_files.h
index fe77605..06f399d 100644
--- a/src/os/win32/ngx_files.h
+++ b/src/os/win32/ngx_files.h
@@ -154,6 +154,7 @@
 
 #define ngx_file_size(fi)                                                    \
     (((off_t) (fi)->nFileSizeHigh << 32) | (fi)->nFileSizeLow)
+#define ngx_file_fs_size(fi)        ngx_file_size(fi)
 
 #define ngx_file_uniq(fi)   (*(ngx_file_uniq_t *) &(fi)->nFileIndexHigh)