LU-1303 osp: Basic OSP device implementation

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

diff --git a/lustre/obdclass/lprocfs_status.c b/lustre/obdclass/lprocfs_status.c
index e1dc6de..0d072c4 100644 (file)
--- a/lustre/obdclass/lprocfs_status.c
+++ b/lustre/obdclass/lprocfs_status.c
@@ -379,7 +379,7 @@ out:
 }
 EXPORT_SYMBOL(lprocfs_add_vars);
 
-void lprocfs_remove(struct proc_dir_entry **rooth)
+void lprocfs_remove_nolock(struct proc_dir_entry **rooth)
 {
         struct proc_dir_entry *root = *rooth;
         struct proc_dir_entry *temp = root;
@@ -392,7 +392,6 @@ void lprocfs_remove(struct proc_dir_entry **rooth)
 
         parent = root->parent;
         LASSERT(parent != NULL);
-        LPROCFS_WRITE_ENTRY(); /* search vs remove race */
 
         while (1) {
                 while (temp->subdir != NULL)
@@ -428,7 +427,13 @@ void lprocfs_remove(struct proc_dir_entry **rooth)
                 if (temp == parent)
                         break;
         }
-        LPROCFS_WRITE_EXIT();
+}
+
+void lprocfs_remove(struct proc_dir_entry **rooth)
+{
+       LPROCFS_WRITE_ENTRY(); /* search vs remove race */
+       lprocfs_remove_nolock(rooth);
+       LPROCFS_WRITE_EXIT();
 }
 EXPORT_SYMBOL(lprocfs_remove);
 
@@ -439,6 +444,52 @@ void lprocfs_remove_proc_entry(const char *name, struct proc_dir_entry *parent)
 }
 EXPORT_SYMBOL(lprocfs_remove_proc_entry);
 
+void lprocfs_try_remove_proc_entry(const char *name,
+                                  struct proc_dir_entry *parent)
+{
+       struct proc_dir_entry    *t = NULL;
+       struct proc_dir_entry   **p;
+       int                       len, busy = 0;
+
+       LASSERT(parent != NULL);
+       len = strlen(name);
+
+       LPROCFS_WRITE_ENTRY();
+
+       /* lookup target name */
+       for (p = &parent->subdir; *p; p = &(*p)->next) {
+               if ((*p)->namelen != len)
+                       continue;
+               if (memcmp(name, (*p)->name, len))
+                       continue;
+               t = *p;
+               break;
+       }
+
+       if (t) {
+               /* verify it's empty: do not count "num_refs" */
+               for (p = &t->subdir; *p; p = &(*p)->next) {
+                       if ((*p)->namelen != strlen("num_refs")) {
+                               busy = 1;
+                               break;
+                       }
+                       if (memcmp("num_refs", (*p)->name,
+                                  strlen("num_refs"))) {
+                               busy = 1;
+                               break;
+                       }
+               }
+       }
+
+       if (busy == 0)
+               lprocfs_remove_nolock(&t);
+
+       LPROCFS_WRITE_EXIT();
+
+       return;
+}
+EXPORT_SYMBOL(lprocfs_try_remove_proc_entry);
+
 struct proc_dir_entry *lprocfs_register(const char *name,
                                         struct proc_dir_entry *parent,
                                         struct lprocfs_vars *list, void *data)