performance/read-ahead: dump pages in read-ahead cache.

Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 1059 (enhancements for getting statistics from performance translators)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1059

1 files changed, 91 insertions, 0 deletions

diff --git a/xlators/performance/read-ahead/src/read-ahead.c b/xlators/performance/read-ahead/src/read-ahead.c
index d41931eec..6358b4f48 100644
--- a/xlators/performance/read-ahead/src/read-ahead.c
+++ b/xlators/performance/read-ahead/src/read-ahead.c
@@ -793,6 +793,96 @@ unwind:
 }
 
 
+void
+ra_page_dump (struct ra_page *page, char *key_prefix)
+{
+        int           i                        = 0;
+        call_frame_t *frame                    = NULL;
+        char          key[GF_DUMP_MAX_BUF_LEN] = {0, };
+        ra_waitq_t   *trav                     = NULL;
+
+        if (page == NULL) {
+                goto out;
+        }
+
+        gf_proc_dump_build_key (key, key_prefix, "offset");
+        gf_proc_dump_write (key, "%"PRId64, page->offset);
+
+        gf_proc_dump_build_key (key, key_prefix, "size");
+        gf_proc_dump_write (key, "%"PRId64, page->size);
+
+        gf_proc_dump_build_key (key, key_prefix, "dirty");
+        gf_proc_dump_write (key, "%s", page->dirty ? "yes" : "no");
+
+        gf_proc_dump_build_key (key, key_prefix, "ready");
+        gf_proc_dump_write (key, "%s", page->ready ? "yes" : "no");
+
+        for (trav = page->waitq; trav; trav = trav->next) {
+		frame = trav->data;
+                gf_proc_dump_build_key (key, key_prefix, "waiting-frame[%d]",
+                                        i++);
+                gf_proc_dump_write (key, "%"PRId64, frame->root->unique);
+	}
+
+out:
+        return;
+}
+
+int32_t
+ra_fdctx_dump (xlator_t *this, fd_t *fd)
+{
+	ra_file_t    *file     = NULL;
+        ra_page_t    *page     = NULL;
+        int32_t       ret      = 0, i = 0;
+        uint64_t      tmp_file = 0;
+        char          key[GF_DUMP_MAX_BUF_LEN]        = {0, };
+        char          key_prefix[GF_DUMP_MAX_BUF_LEN] = {0, };
+
+	fd_ctx_get (fd, this, &tmp_file);
+	file = (ra_file_t *)(long)tmp_file;
+
+        if (file == NULL) {
+                ret = 0;
+                goto out;
+        }
+
+        gf_proc_dump_build_key (key_prefix,
+                                "xlator.performance.read-ahead",
+                                "file");
+
+        gf_proc_dump_add_section (key_prefix);
+
+        gf_proc_dump_build_key (key, key_prefix, "fd");
+        gf_proc_dump_write (key, "%p", fd);
+
+        gf_proc_dump_build_key (key, key_prefix, "disabled");
+        gf_proc_dump_write (key, "%s", file->disabled ? "yes" : "no");
+
+        if (file->disabled) {
+                ret = 0;
+                goto out;
+        }
+
+        gf_proc_dump_build_key (key, key_prefix, "page-size");
+        gf_proc_dump_write (key, "%"PRId64, file->page_size);
+
+        gf_proc_dump_build_key (key, key_prefix, "page-count");
+        gf_proc_dump_write (key, "%u", file->page_count);
+
+        gf_proc_dump_build_key (key, key_prefix,
+                                "next-expected-offset-for-sequential-reads");
+        gf_proc_dump_write (key, "%"PRId64, file->offset);
+
+        for (page = file->pages.next; page != &file->pages;
+             page = page->next) {
+                gf_proc_dump_build_key (key, key_prefix, "page[%d]", i++);
+		ra_page_dump (page, key_prefix);
+        }
+        
+out:
+        return ret;
+}
+
 int
 ra_fstat (call_frame_t *frame, xlator_t *this, fd_t *fd)
 {
@@ -1063,6 +1153,7 @@ struct xlator_cbks cbks = {
 
 struct xlator_dumpops dumpops = {
         .priv      =  ra_priv_dump,
+        .fdctx     =  ra_fdctx_dump,
 };
 
 struct volume_options options[] = {