xiaoxiang781216 commented on code in PR #19900:
URL: https://github.com/apache/nuttx/pull/19900#discussion_r3838870807
##########
fs/inode/fs_inodesearch.c:
##########
@@ -193,6 +199,120 @@ static int _inode_linktarget(FAR struct inode *inode,
}
#endif
+#ifdef CONFIG_FS_CHROOT
+/****************************************************************************
+ * Name: inode_get_chroot
+ ****************************************************************************/
+
+static FAR struct inode *inode_get_chroot(FAR const char **relpath)
+{
+ FAR struct tcb_s *tcb = nxsched_self();
+
+ if (relpath != NULL)
+ {
+ *relpath = NULL;
+ }
+
+ if (tcb != NULL && tcb->group != NULL && tcb->group->tg_root != NULL)
+ {
+ if (relpath != NULL)
+ {
+ *relpath = tcb->group->tg_rootrel;
+ }
+
+ return tcb->group->tg_root;
+ }
+
+ return g_root_inode;
+}
+
+/****************************************************************************
+ * Name: inode_normalize_abs
+ *
+ * Description:
+ * Normalize an absolute path: drop empty and "." segments, and clamp
+ * ".." at the search root. Needed even before a jail is installed:
+ * chroot(".") becomes "$PWD/.", and if PWD sits under a mountpoint
+ * (tmpfs /tmp) the leftover "." is passed to the filesystem as
+ * relpath and fails with ENOENT.
+ *
+ ****************************************************************************/
+
+static int inode_normalize_abs(FAR const char *in, FAR char *out,
+ size_t outlen)
+{
+ FAR char *dst;
+ FAR const char *src = in;
+
+ if (outlen < 2)
+ {
+ return -ENAMETOOLONG;
+ }
+
+ out[0] = '/';
+ dst = out + 1;
+
+ while (*src == '/')
+ {
+ src++;
+ }
+
+ while (*src != '\0')
+ {
+ FAR const char *end = src;
+ size_t seglen;
+
+ while (*end != '\0' && *end != '/')
Review Comment:
why not?
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