LU-8066 obd: final pieces for sysfs/debugfs support.

[fs/lustre-release.git] / lustre / obdclass / lprocfs_status_server.c

diff --git a/lustre/obdclass/lprocfs_status_server.c b/lustre/obdclass/lprocfs_status_server.c
index 0e07dd6..bbd81a9 100644 (file)
--- a/lustre/obdclass/lprocfs_status_server.c
+++ b/lustre/obdclass/lprocfs_status_server.c
@@ -41,6 +41,49 @@
 #include <lprocfs_status.h>
 #include <lustre_nodemap.h>
 
+#define MAX_STRING_SIZE 128
+
+struct dentry *ldebugfs_add_symlink(const char *name, const char *target,
+                                   const char *format, ...)
+{
+       struct dentry *entry = NULL;
+       struct dentry *parent;
+       struct qstr dname;
+       va_list ap;
+       char *dest;
+
+       if (!target || !format)
+               return NULL;
+
+       dname.name = target;
+       dname.len = strlen(dname.name);
+       dname.hash = ll_full_name_hash(parent, dname.name, dname.len);
+       parent = d_lookup(debugfs_lustre_root, &dname);
+       if (!parent)
+               return NULL;
+
+       OBD_ALLOC_WAIT(dest, MAX_STRING_SIZE + 1);
+       if (!dest)
+               goto no_entry;
+
+       va_start(ap, format);
+       vsnprintf(dest, MAX_STRING_SIZE, format, ap);
+       va_end(ap);
+
+       entry = debugfs_create_symlink(name, parent, dest);
+       if (IS_ERR_OR_NULL(entry)) {
+               CERROR("LdebugFS: Could not create symbolic link from %s to %s\n",
+                      name, dest);
+               entry = NULL;
+       }
+
+       OBD_FREE(dest, MAX_STRING_SIZE + 1);
+no_entry:
+       dput(parent);
+       return entry;
+}
+EXPORT_SYMBOL(ldebugfs_add_symlink);
+
 #ifdef CONFIG_PROC_FS
 
 int lprocfs_evict_client_open(struct inode *inode, struct file *f)