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[PATCH 4/4] Serve mounts node with a passive translator record
From: |
Justus Winter |
Subject: |
[PATCH 4/4] Serve mounts node with a passive translator record |
Date: |
Tue, 16 Jul 2013 10:51:23 +0200 |
Make mounts a node with a passive translator record so that the mtab
translator is started on access if it is available.
* rootdir.c (MTAB_TRANSLATOR): New macro.
(rootdir_mounts_get_translator): New function.
(mtab_translator_state): New enum.
(rootdir_mounts_exists): New function.
(rootdir_translator_make_node): Likewise.
(rootdir_entries): Add "mounts" node.
---
rootdir.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/rootdir.c b/rootdir.c
index 31e2d8c..c8ff01d 100644
--- a/rootdir.c
+++ b/rootdir.c
@@ -404,6 +404,37 @@ rootdir_gc_fakeself (void *hook, char **contents, ssize_t
*contents_len)
return 0;
}
+/* The mtab translator to use by default for the "mounts" node. */
+#define MTAB_TRANSLATOR "/hurd/mtab"
+
+static error_t
+rootdir_mounts_get_translator (void *hook, char **argz, size_t *argz_len)
+{
+ static char mtab_argz[] = MTAB_TRANSLATOR "\0/";
+
+ *argz = malloc(sizeof mtab_argz);
+ if (! *argz)
+ return ENOMEM;
+
+ memcpy (*argz, mtab_argz, sizeof mtab_argz);
+ *argz_len = sizeof mtab_argz;
+ return 0;
+}
+
+enum mtab_translator_state {
+ MTAB_FALSE = FALSE,
+ MTAB_TRUE = TRUE,
+ MTAB_UNINITIALIZED,
+};
+
+static int
+rootdir_mounts_exists ()
+{
+ static enum mtab_translator_state state = MTAB_UNINITIALIZED;
+ if (state == MTAB_UNINITIALIZED)
+ state = access(MTAB_TRANSLATOR, F_OK|X_OK) == 0;
+ return state;
+}
/* Glue logic and entries table */
@@ -426,6 +457,18 @@ rootdir_symlink_make_node (void *dir_hook, const void
*entry_hook)
return np;
}
+static struct node *
+rootdir_translator_make_node (void *dir_hook, const void *entry_hook)
+{
+ struct node *np = procfs_make_node (entry_hook, dir_hook);
+ if (np)
+ {
+ procfs_node_chtype (np, S_IFREG | S_IPTRANS);
+ procfs_node_chmod (np, 0444);
+ }
+ return np;
+}
+
static const struct procfs_dir_entry rootdir_entries[] = {
{
.name = "self",
@@ -487,6 +530,16 @@ static const struct procfs_dir_entry rootdir_entries[] = {
.cleanup_contents = procfs_cleanup_contents_with_free,
},
},
+ {
+ .name = "mounts",
+ .hook = & (struct procfs_node_ops) {
+ .get_translator = rootdir_mounts_get_translator,
+ },
+ .ops = {
+ .make_node = rootdir_translator_make_node,
+ .exists = rootdir_mounts_exists,
+ }
+ },
#ifdef PROFILE
/* In order to get a usable gmon.out file, we must apparently use exit(). */
{
--
1.7.10.4