umount: cleanup and code shrink

Signed-off-by: Rob Landley <rob@landley.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 7 insertions, 40 deletions

diff --git a/util-linux/umount.c b/util-linux/umount.c
index 78c603856..5597d9eba 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -9,39 +9,10 @@
  */
 #include <mntent.h>
 #include <sys/mount.h>
-/* Make sure we have all the new mount flags we actually try to use. */
-#ifndef MS_BIND
-# define MS_BIND        (1 << 12)
-#endif
-#ifndef MS_MOVE
-# define MS_MOVE        (1 << 13)
-#endif
-#ifndef MS_RECURSIVE
-# define MS_RECURSIVE   (1 << 14)
-#endif
-#ifndef MS_SILENT
-# define MS_SILENT      (1 << 15)
-#endif
-/* The shared subtree stuff, which went in around 2.6.15. */
-#ifndef MS_UNBINDABLE
-# define MS_UNBINDABLE  (1 << 17)
-#endif
-#ifndef MS_PRIVATE
-# define MS_PRIVATE     (1 << 18)
-#endif
-#ifndef MS_SLAVE
-# define MS_SLAVE       (1 << 19)
-#endif
-#ifndef MS_SHARED
-# define MS_SHARED      (1 << 20)
-#endif
-#ifndef MS_RELATIME
-# define MS_RELATIME    (1 << 21)
-#endif
 #include "libbb.h"
 
-
 #if defined(__dietlibc__)
+// TODO: This does not belong here.
 /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
  * dietlibc-0.30 does not have implementation of getmntent_r() */
 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
@@ -54,23 +25,17 @@ static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
 
 /* ignored: -v -d -t -i */
 #define OPTION_STRING           "fldnra" "vdt:i"
-#define OPT_FORCE               (1 << 0)
-#define OPT_LAZY                (1 << 1)
+#define OPT_FORCE               (1 << 0) // Same as MNT_FORCE
+#define OPT_LAZY                (1 << 1) // Same as MNT_DETACH
 #define OPT_FREELOOP            (1 << 2)
 #define OPT_NO_MTAB             (1 << 3)
 #define OPT_REMOUNT             (1 << 4)
 #define OPT_ALL                 (ENABLE_FEATURE_UMOUNT_ALL ? (1 << 5) : 0)
 
-// These constants from linux/fs.h must match OPT_FORCE and OPT_LAZY,
-// otherwise "doForce" trick below won't work!
-//#define MNT_FORCE  0x00000001 /* Attempt to forcibly umount */
-//#define MNT_DETACH 0x00000002 /* Just detach from the tree */
-
 int umount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int umount_main(int argc UNUSED_PARAM, char **argv)
 {
         int doForce;
-        char *const buf = xmalloc(4096); /* reducing stack usage */
         struct mntent me;
         FILE *fp;
         char *fstype = NULL;
@@ -85,6 +50,9 @@ int umount_main(int argc UNUSED_PARAM, char **argv)
         opt = getopt32(argv, OPTION_STRING, &fstype);
         //argc -= optind;
         argv += optind;
+
+        // MNT_FORCE and MNT_DETACH (from linux/fs.h) must match
+        // OPT_FORCE and OPT_LAZY, otherwise this trick won't work:
         doForce = MAX((opt & OPT_FORCE), (opt & OPT_LAZY));
 
         /* Get a list of mount points from mtab.  We read them all in now mostly
@@ -101,7 +69,7 @@ int umount_main(int argc UNUSED_PARAM, char **argv)
                 if (opt & OPT_ALL)
                         bb_error_msg_and_die("can't open '%s'", bb_path_mtab_file);
         } else {
-                while (getmntent_r(fp, &me, buf, 4096)) {
+                while (getmntent_r(fp, &me, bb_common_bufsiz1, sizeof(bb_common_bufsiz1))) {
                         /* Match fstype if passed */
                         if (!match_fstype(&me, fstype))
                                 continue;
@@ -203,7 +171,6 @@ int umount_main(int argc UNUSED_PARAM, char **argv)
                         free(mtl);
                         mtl = m;
                 }
-                free(buf);
         }
 
         return status;