fs_shell: 'resizefs' command

Change-Id: Ie4c18c76cd1a69945739817ecd99409b7611dd7a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/939
Reviewed-by: Jérôme Duval <[email protected]>

src/add-ons/kernel/file_systems/bfs/bfs_control.h

@@ -98,4 +98,10 @@ struct check_control {
 #define BFS_IOCTL_CHECK_MAGIC	'BChk'
 
 
+/* A "back door" to side-step the regular resize interface, primarily for
+ * testing with bfs_shell. The parameter is a uint64 with the desired size.
+ */
+#define BFS_IOCTL_RESIZE		14205
+
+
 #endif	/* BFS_CONTROL_H */

src/add-ons/kernel/file_systems/bfs/kernel_interface.cpp

@@ -766,6 +766,18 @@ bfs_ioctl(fs_volume* _volume, fs_vnode* _node, void* _cookie, uint32 cmd,
 
 			return volume->WriteSuperBlock();
 		}
+		case BFS_IOCTL_RESIZE:
+		{
+			if (bufferLength != sizeof(uint64))
+				return B_BAD_VALUE;
+
+			uint64 size;
+			if (user_memcpy((uint8*)&size, buffer, sizeof(uint64)) != B_OK)
+				return B_BAD_ADDRESS;
+
+			ResizeVisitor resizer(volume);
+			return resizer.Resize(size, -1);
+		}
 
 #ifdef DEBUG_FRAGMENTER
 		case 56741:

src/tools/bfs_shell/Jamfile

@@ -71,6 +71,7 @@ BuildPlatformMain <build>bfs_shell
 	:
 	additional_commands.cpp
 	command_checkfs.cpp
+	command_resizefs.cpp
 	:
 	<build>bfs.o
 	<build>fs_shell.a $(HOST_LIBSUPC++) $(HOST_LIBSTDC++)

src/tools/bfs_shell/additional_commands.cpp

@@ -7,6 +7,7 @@
 #include "fssh.h"
 
 #include "command_checkfs.h"
+#include "command_resizefs.h"
 
 
 namespace FSShell {
@@ -17,6 +18,8 @@ register_additional_commands()
 {
 	CommandManager::Default()->AddCommand(command_checkfs, "checkfs",
 		"check file system");
+	CommandManager::Default()->AddCommand(command_resizefs, "resizefs",
+		"resize file system");
 }
 
 

src/tools/bfs_shell/command_resizefs.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2012, Andreas Henriksson, sausageboy@gmail.com.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include "fssh_stdio.h"
+#include "syscalls.h"
+
+#include "bfs.h"
+#include "bfs_control.h"
+
+
+namespace FSShell {
+
+
+fssh_status_t
+command_resizefs(int argc, const char* const* argv)
+{
+	if (argc != 2) {
+		fssh_dprintf("Usage: %s <new size>\n", argv[0]);
+		return B_ERROR;
+	}
+
+	uint64 newSize;
+	if (fssh_sscanf(argv[1], "%" B_SCNu64, &newSize) < 1) {
+		fssh_dprintf("Unknown argument or invalid size\n");
+		return B_ERROR;
+	}
+
+	int rootDir = _kern_open_dir(-1, "/myfs");
+	if (rootDir < 0) {
+		fssh_dprintf("Error: Couldn't open root directory\n");
+		return rootDir;
+	}
+
+	status_t status = _kern_ioctl(rootDir, BFS_IOCTL_RESIZE,
+		&newSize, sizeof(newSize));
+
+	_kern_close(rootDir);
+
+	if (status != B_OK) {
+		fssh_dprintf("Resizing failed, status: %s\n", fssh_strerror(status));
+		return status;
+	}
+
+	fssh_dprintf("File system successfully resized!\n");
+	return B_OK;
+}
+
+
+}	// namespace FSShell

src/tools/bfs_shell/command_resizefs.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2012, Andreas Henriksson, sausageboy@gmail.com.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef RESIZEFS_H
+#define RESIZEFS_H
+
+
+#include "fssh_types.h"
+
+
+namespace FSShell {
+
+
+fssh_status_t command_resizefs(int argc, const char* const* argv);
+
+
+}	// namespace FSShell
+
+
+#endif	// RESIZEFS_H