LU-17471 osd: add symlink for brw_stats

[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_lproc.c

diff --git a/lustre/osd-ldiskfs/osd_lproc.c b/lustre/osd-ldiskfs/osd_lproc.c
index f4a1fcc..21f3b8f 100644 (file)
--- a/lustre/osd-ldiskfs/osd_lproc.c
+++ b/lustre/osd-ldiskfs/osd_lproc.c
@@ -56,6 +56,46 @@ void osd_brw_stats_update(struct osd_device *osd, struct osd_iobuf *iobuf)
                              iobuf->dr_pextents);
 }
 
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 17, 53, 0)
+static void osd_symlink_brw_stats(struct osd_device *osd)
+{
+       size_t len_root;
+       size_t len_path;
+       char *root;
+       char *s;
+       char *p;
+       char *path;
+
+       OBD_ALLOC(path, PATH_MAX);
+       if (path == NULL)
+               return;
+
+       p = dentry_path_raw(osd->od_dt_dev.dd_debugfs_entry, path, PATH_MAX);
+       if (IS_ERR(p))
+               goto out;
+
+       root = osd->od_dt_dev.dd_debugfs_entry->d_sb->s_fs_info;
+       len_root = strlen(root);
+       len_path = strlen(p);
+       if (len_root > (p - path) || len_root + len_path + 16 > PATH_MAX)
+               goto out;
+
+       strlcpy(path, root, len_root);
+       if (p > path + len_root) {
+               s = path + len_root;
+               while ((*s++ = *p++) != '\0');
+       }
+
+       *(path + len_root + len_path) = '\0';
+       strcat(path, "/brw_stats");
+       lprocfs_add_symlink("brw_stats", osd->od_proc_entry,
+                           "/sys/kernel/debug/%s", path);
+
+out:
+       OBD_FREE(path, PATH_MAX);
+}
+#endif
+
 static int osd_stats_init(struct osd_device *osd)
 {
        int result = -ENOMEM;
@@ -97,6 +137,10 @@ static int osd_stats_init(struct osd_device *osd)
        ldebugfs_register_osd_stats(osd->od_dt_dev.dd_debugfs_entry,
                                    &osd->od_brw_stats, osd->od_stats);
 
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 17, 53, 0)
+       osd_symlink_brw_stats(osd);
+#endif
+
        RETURN(result);
 }