Add support for "noatime" and "nodiratime" mount flags to mount.

Change umount "-f" to mean force, and actually use umount2.
Change umount "-l" to mean "Do not free loop device".
Updates docs accordingly.
 -Erik

busybox.def.h

@@ -181,6 +181,10 @@
 // Enable support for a real /etc/mtab file instead of /proc/mounts
 //#define BB_FEATURE_MOUNT_MTAB_SUPPORT
 //
+// Enable support forced filesystem unmounting 
+// (i.e. in case of an unreachable NFS system).
+#define BB_FEATURE_MOUNT_FORCE
+//
 // Enable support for mounting remote NFS volumes
 //#define BB_FEATURE_NFSMOUNT
 //

docs/busybox.pod

@@ -1111,21 +1111,22 @@ Usage:  mount [flags]
 
 Flags:
 
-	-a:     Mount all file systems in fstab.
+	-a:             Mount all file systems in fstab.
 	-o option:      One of many filesystem options, listed below.
-	-r:     Mount the filesystem read-only.
+	-r:             Mount the filesystem read-only.
-	-t filesystem-type:     Specify the filesystem type.
+	-t fs-type:     Specify the filesystem type.
-	-w:     Mount for reading and writing (default).
+	-w:             Mount for reading and writing (default).
 
-Options for use with the "B<-o>" flag:
+Options for use with the "-o" flag:
 
-	async / sync:   Writes are asynchronous / synchronous.
+	async/sync:     Writes are asynchronous / synchronous.
-	dev / nodev:    Allow use of special device files / disallow them.
+	atime/noatime:  Enable / disable updates to inode access times.
-	exec / noexec:  Allow use of executable files / disallow them.
+	dev/nodev:      Allow use of special device files / disallow them.
-	loop: Mounts a file via loop device.
+	exec/noexec:    Allow use of executable files / disallow them.
-	suid / nosuid:  Allow set-user-id-root programs / disallow them.
+	loop:           Mounts a file via loop device.
-	remount: Re-mount a currently-mounted filesystem, changing its flags.
+	suid/nosuid:    Allow set-user-id-root programs / disallow them.
-	ro / rw: Mount for read-only / read-write.
+	remount:        Re-mount a currently-mounted filesystem, changing its flags.
+	ro/rw:          Mount for read-only / read-write.
 	There are EVEN MORE flags that are specific to each filesystem.
 	You'll have to see the written documentation for those.
 
@@ -1663,9 +1664,10 @@ Usage: umount [flags] filesystem|directory
 
 Flags:
 
-        -a:     Unmount all file systems
+		-a:     Unmount all file systems
-        -r:     Try to remount devices as read-only if mount is busy
+		-r:     Try to remount devices as read-only if mount is busy
-        -f:     Do not free loop device (if a loop device has been used)
+		-f:     Force filesystem umount (i.e. unreachable NFS server)
+		-l:     Do not free loop device (if a loop device has been used)
 
 Example:
 
@@ -1876,4 +1878,4 @@ Enrique Zanardi <ezanardi@ull.es>
 
 =cut
 
-# $Id: busybox.pod,v 1.27 2000/05/02 06:40:02 erik Exp $
+# $Id: busybox.pod,v 1.28 2000/05/05 19:49:33 erik Exp $

mount.c

@@ -66,26 +66,28 @@ extern const char mtab_file[];	/* Defined in utility.c */
 
 static const char mount_usage[] = "\tmount [flags]\n"
 	"\tmount [flags] device directory [-o options,more-options]\n"
-	"\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
+	"\n" "Flags:\n" 
+	"\t-a:\t\tMount all file systems in fstab.\n"
 #ifdef BB_MTAB
-	"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
+	"\t-f:\t\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
-	"\t-n:\tDon't write a mount table entry.\n"
+	"\t-n:\t\tDon't write a mount table entry.\n"
 #endif
 	"\t-o option:\tOne of many filesystem options, listed below.\n"
-	"\t-r:\tMount the filesystem read-only.\n"
+	"\t-r:\t\tMount the filesystem read-only.\n"
-	"\t-t filesystem-type:\tSpecify the filesystem type.\n"
+	"\t-t fs-type:\tSpecify the filesystem type.\n"
-	"\t-w:\tMount for reading and writing (default).\n"
+	"\t-w:\t\tMount for reading and writing (default).\n"
 	"\n"
 	"Options for use with the \"-o\" flag:\n"
-	"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
+	"\tasync/sync:\tWrites are asynchronous / synchronous.\n"
-	"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
+	"\tatime/noatime:\tEnable / disable updates to inode access times.\n"
-	"\texec / noexec:\tAllow use of executable files / disallow them.\n"
+	"\tdev/nodev:\tAllow use of special device files / disallow them.\n"
+	"\texec/noexec:\tAllow use of executable files / disallow them.\n"
 #if defined BB_FEATURE_MOUNT_LOOP
-	"\tloop: Mounts a file via loop device.\n"
+	"\tloop:\t\tMounts a file via loop device.\n"
 #endif
-	"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
+	"\tsuid/nosuid:\tAllow set-user-id-root programs / disallow them.\n"
-	"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
+	"\tremount:\tRe-mount a currently-mounted filesystem, changing its flags.\n"
-	"\tro / rw: Mount for read-only / read-write.\n"
+	"\tro/rw:\t\tMount for read-only / read-write.\n"
 	"There are EVEN MORE flags that are specific to each filesystem.\n"
 	"You'll have to see the written documentation for those.\n";
 
@@ -98,10 +100,14 @@ struct mount_options {
 
 static const struct mount_options mount_options[] = {
 	{"async", ~MS_SYNCHRONOUS, 0},
+	{"atime", ~0, ~MS_NOATIME},
 	{"defaults", ~0, 0},
 	{"dev", ~MS_NODEV, 0},
+	{"diratime", ~0, ~MS_NODIRATIME},
 	{"exec", ~MS_NOEXEC, 0},
+	{"noatime", ~0, MS_NOATIME},
 	{"nodev", ~0, MS_NODEV},
+	{"nodiratime", ~0, MS_NODIRATIME},
 	{"noexec", ~0, MS_NOEXEC},
 	{"nosuid", ~0, MS_NOSUID},
 	{"remount", ~0, MS_REMOUNT},

umount.c

@@ -38,8 +38,11 @@ static const char umount_usage[] =
 	"\n"
 #endif
 	"\t-r:\tTry to remount devices as read-only if mount is busy\n"
+#if defined BB_FEATURE_MOUNT_FORCE
+	"\t-f:\tForce filesystem umount (i.e. unreachable NFS server)\n"
+#endif
 #if defined BB_FEATURE_MOUNT_LOOP
-	"\t-f:\tDo not free loop device (if a loop device has been used)\n"
+	"\t-l:\tDo not free loop device (if a loop device has been used)\n"
 #endif
 ;
 
@@ -53,6 +56,9 @@ static struct _mtab_entry_t *mtab_cache = NULL;
 
 
 
+#if defined BB_FEATURE_MOUNT_FORCE
+static int doForce = FALSE;
+#endif
 #if defined BB_FEATURE_MOUNT_LOOP
 static int freeLoop = TRUE;
 #endif
@@ -175,6 +181,14 @@ static int do_umount(const char *name, int useMtab)
 	if (freeLoop == TRUE && blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
 		/* this was a loop device, delete it */
 		del_loop(blockDevice);
+#endif
+#if defined BB_FEATURE_MOUNT_FORCE
+	if (status != 0 && doForce == TRUE) {
+		status = umount2(blockDevice, MNT_FORCE);
+		if (status != 0) {
+			fatalError("umount: forced umount of %s failed!\n", blockDevice);
+		}
+	}
 #endif
 	if (status != 0 && doRemount == TRUE && errno == EBUSY) {
 		status = mount(blockDevice, name, NULL,
@@ -182,7 +196,6 @@ static int do_umount(const char *name, int useMtab)
 		if (status == 0) {
 			fprintf(stderr, "umount: %s busy - remounted read-only\n",
 					blockDevice);
-			/* TODO: update mtab if BB_MTAB is defined */
 		} else {
 			fprintf(stderr, "umount: Cannot remount %s read-only\n",
 					blockDevice);
@@ -240,7 +253,7 @@ extern int umount_main(int argc, char **argv)
 				umountAll = TRUE;
 				break;
 #if defined BB_FEATURE_MOUNT_LOOP
-			case 'f':
+			case 'l':
 				freeLoop = FALSE;
 				break;
 #endif
@@ -248,6 +261,11 @@ extern int umount_main(int argc, char **argv)
 			case 'n':
 				useMtab = FALSE;
 				break;
+#endif
+#ifdef BB_FEATURE_MOUNT_FORCE
+			case 'f':
+				doForce = TRUE;
+				break;
 #endif
 			case 'r':
 				doRemount = TRUE;

util-linux/mount.c

@@ -66,26 +66,28 @@ extern const char mtab_file[];	/* Defined in utility.c */
 
 static const char mount_usage[] = "\tmount [flags]\n"
 	"\tmount [flags] device directory [-o options,more-options]\n"
-	"\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
+	"\n" "Flags:\n" 
+	"\t-a:\t\tMount all file systems in fstab.\n"
 #ifdef BB_MTAB
-	"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
+	"\t-f:\t\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
-	"\t-n:\tDon't write a mount table entry.\n"
+	"\t-n:\t\tDon't write a mount table entry.\n"
 #endif
 	"\t-o option:\tOne of many filesystem options, listed below.\n"
-	"\t-r:\tMount the filesystem read-only.\n"
+	"\t-r:\t\tMount the filesystem read-only.\n"
-	"\t-t filesystem-type:\tSpecify the filesystem type.\n"
+	"\t-t fs-type:\tSpecify the filesystem type.\n"
-	"\t-w:\tMount for reading and writing (default).\n"
+	"\t-w:\t\tMount for reading and writing (default).\n"
 	"\n"
 	"Options for use with the \"-o\" flag:\n"
-	"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
+	"\tasync/sync:\tWrites are asynchronous / synchronous.\n"
-	"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
+	"\tatime/noatime:\tEnable / disable updates to inode access times.\n"
-	"\texec / noexec:\tAllow use of executable files / disallow them.\n"
+	"\tdev/nodev:\tAllow use of special device files / disallow them.\n"
+	"\texec/noexec:\tAllow use of executable files / disallow them.\n"
 #if defined BB_FEATURE_MOUNT_LOOP
-	"\tloop: Mounts a file via loop device.\n"
+	"\tloop:\t\tMounts a file via loop device.\n"
 #endif
-	"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
+	"\tsuid/nosuid:\tAllow set-user-id-root programs / disallow them.\n"
-	"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
+	"\tremount:\tRe-mount a currently-mounted filesystem, changing its flags.\n"
-	"\tro / rw: Mount for read-only / read-write.\n"
+	"\tro/rw:\t\tMount for read-only / read-write.\n"
 	"There are EVEN MORE flags that are specific to each filesystem.\n"
 	"You'll have to see the written documentation for those.\n";
 
@@ -98,10 +100,14 @@ struct mount_options {
 
 static const struct mount_options mount_options[] = {
 	{"async", ~MS_SYNCHRONOUS, 0},
+	{"atime", ~0, ~MS_NOATIME},
 	{"defaults", ~0, 0},
 	{"dev", ~MS_NODEV, 0},
+	{"diratime", ~0, ~MS_NODIRATIME},
 	{"exec", ~MS_NOEXEC, 0},
+	{"noatime", ~0, MS_NOATIME},
 	{"nodev", ~0, MS_NODEV},
+	{"nodiratime", ~0, MS_NODIRATIME},
 	{"noexec", ~0, MS_NOEXEC},
 	{"nosuid", ~0, MS_NOSUID},
 	{"remount", ~0, MS_REMOUNT},

util-linux/umount.c

@@ -38,8 +38,11 @@ static const char umount_usage[] =
 	"\n"
 #endif
 	"\t-r:\tTry to remount devices as read-only if mount is busy\n"
+#if defined BB_FEATURE_MOUNT_FORCE
+	"\t-f:\tForce filesystem umount (i.e. unreachable NFS server)\n"
+#endif
 #if defined BB_FEATURE_MOUNT_LOOP
-	"\t-f:\tDo not free loop device (if a loop device has been used)\n"
+	"\t-l:\tDo not free loop device (if a loop device has been used)\n"
 #endif
 ;
 
@@ -53,6 +56,9 @@ static struct _mtab_entry_t *mtab_cache = NULL;
 
 
 
+#if defined BB_FEATURE_MOUNT_FORCE
+static int doForce = FALSE;
+#endif
 #if defined BB_FEATURE_MOUNT_LOOP
 static int freeLoop = TRUE;
 #endif
@@ -175,6 +181,14 @@ static int do_umount(const char *name, int useMtab)
 	if (freeLoop == TRUE && blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
 		/* this was a loop device, delete it */
 		del_loop(blockDevice);
+#endif
+#if defined BB_FEATURE_MOUNT_FORCE
+	if (status != 0 && doForce == TRUE) {
+		status = umount2(blockDevice, MNT_FORCE);
+		if (status != 0) {
+			fatalError("umount: forced umount of %s failed!\n", blockDevice);
+		}
+	}
 #endif
 	if (status != 0 && doRemount == TRUE && errno == EBUSY) {
 		status = mount(blockDevice, name, NULL,
@@ -182,7 +196,6 @@ static int do_umount(const char *name, int useMtab)
 		if (status == 0) {
 			fprintf(stderr, "umount: %s busy - remounted read-only\n",
 					blockDevice);
-			/* TODO: update mtab if BB_MTAB is defined */
 		} else {
 			fprintf(stderr, "umount: Cannot remount %s read-only\n",
 					blockDevice);
@@ -240,7 +253,7 @@ extern int umount_main(int argc, char **argv)
 				umountAll = TRUE;
 				break;
 #if defined BB_FEATURE_MOUNT_LOOP
-			case 'f':
+			case 'l':
 				freeLoop = FALSE;
 				break;
 #endif
@@ -248,6 +261,11 @@ extern int umount_main(int argc, char **argv)
 			case 'n':
 				useMtab = FALSE;
 				break;
+#endif
+#ifdef BB_FEATURE_MOUNT_FORCE
+			case 'f':
+				doForce = TRUE;
+				break;
 #endif
 			case 'r':
 				doRemount = TRUE;