Refresh nodes when they're read from the start.

This is necessary for top, for instance, which keeps some files open and
re-reads them regularly. As an extra bonus we can drop the refresh hack.

* procfs.c, procfs.h: Remove the refresh hack.
  (procfs_refresh): New function, invalidates the cached contents.
* netfs.c (netfs_attempt_read, netfs_get_dirents): Call
  procfs_refresh when the read is from offset 0.
* proclist.c (proclist_make_node): Remove the refresh hack.
* dircat.c (dircat_make_node): Likewise.
  (dircat_get_contents): Use procfs_refresh to avoid keeping old data
  from the component nodes.

1 files changed, 3 insertions, 2 deletions

diff --git a/dircat.c b/dircat.c
index d043486..d24e834 100644
--- a/dircat.c
+++ b/dircat.c
@@ -23,6 +23,9 @@ dircat_get_contents (void *hook, char **contents, ssize_t *contents_len)
       char *subcon;
       ssize_t sublen;
 
+      /* Make sure we're not getting some old stuff.  */
+      procfs_refresh (dcn->dirs[i]);
+
       err = procfs_get_contents (dcn->dirs[i], &subcon, &sublen);
       if (err)
         {
@@ -83,8 +86,6 @@ dircat_make_node (struct node *const *dirs, int num_dirs)
     .cleanup_contents = procfs_cleanup_contents_with_free,
     .lookup = dircat_lookup,
     .cleanup = dircat_cleanup,
-    /* necessary so that it propagates to proclist */
-    .enable_refresh_hack_and_break_readdir = 1,
   };
   struct dircat_node *dcn;
   int i;