vserver 1.9.5.x5

[linux-2.6.git] / fs / hostfs / hostfs.h

diff --git a/fs/hostfs/hostfs.h b/fs/hostfs/hostfs.h
index 416761f..c1516d0 100644 (file)
--- a/fs/hostfs/hostfs.h
+++ b/fs/hostfs/hostfs.h
@@ -16,9 +16,30 @@
 #define HOSTFS_ATTR_CTIME      64
 #define HOSTFS_ATTR_ATIME_SET  128
 #define HOSTFS_ATTR_MTIME_SET  256
+
+/* These two are unused by hostfs. */
 #define HOSTFS_ATTR_FORCE      512     /* Not a change, but a change it */
 #define HOSTFS_ATTR_ATTR_FLAG  1024
 
+/* If you are very careful, you'll notice that these two are missing:
+ *
+ * #define ATTR_KILL_SUID      2048
+ * #define ATTR_KILL_SGID      4096
+ *
+ * and this is because they were added in 2.5 development in this patch:
+ *
+ * http://linux.bkbits.net:8080/linux-2.5/
+ * cset@3caf4a12k4XgDzK7wyK-TGpSZ9u2Ww?nav=index.html
+ * |src/.|src/include|src/include/linux|related/include/linux/fs.h
+ *
+ * Actually, they are not needed by most ->setattr() methods - they are set by
+ * callers of notify_change() to notify that the setuid/setgid bits must be
+ * dropped.
+ * notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
+ * is on, and remove the appropriate bits from attr->ia_mode (attr is a
+ * "struct iattr *"). -BlaisorBlade
+ */
+
 struct hostfs_iattr {
        unsigned int    ia_valid;
        mode_t          ia_mode;