Project Source Control: ASMLib Kernel Driver - oss.oracle.com でソースコードを読める。
/* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * NAME 5 * oracleasm.c - ASM library kernel driver. 6 * 7 * AUTHOR 8 * Joel Becker <joel.becker@oracle.com> 9 * 10 * DESCRIPTION 11 * This file contains the kernel driver of the Oracle Automatic 12 * Storage Managment userspace library. It provides the routines 13 * required to support the userspace library. 14 * 15 * MODIFIED (YYYY/MM/DD) 16 * 2004/01/02 - Joel Becker <joel.becker@oracle.com> 17 * Initial GPL header. 18 * 2004/09/10 - Joel Becker <joel.becker@oracle.com> 19 * First port to 2.6. 20 * 2004/12/16 - Joel Becker <joel.becker@oracle.com> 21 * Change from ioctl to transaction files. 22 * 23 * Copyright (c) 2002-2004 Oracle Corporation. All rights reserved. 24 * 25 * This library is free software; you can redistribute it and/or 26 * modify it under the terms of the GNU General Public 27 * License, version 2 as published by the Free Software Foundation. 28 * 29 * This library is distributed in the hope that it will be useful, 30 * but WITHOUT ANY WARRANTY; without even the implied warranty of 31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 32 * General Public License for more details. 33 * 34 * You should have recieved a copy of the GNU General Public 35 * License along with this library; if not, write to the 36 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 37 * Boston, MA 021110-1307, USA. 38 */ 39 40 /* 41 * This driver's filesystem code is based on the ramfs filesystem. 42 * Copyright information for the original source appears below. 43 */ 44 45 /* Simple VFS hooks based on: */ 46 /* 47 * Resizable simple ram filesystem for Linux. 48 * 49 * Copyright (C) 2000 Linus Torvalds. 50 * 2000 Transmeta Corp. 51 * 52 * Usage limits added by David Gibson, Linuxcare Australia. 53 * This file is released under the GPL. 54 */ 55 56 57 #include <linux/fs.h> 58 #include <linux/file.h> 59 #include <linux/module.h> 60 #include <linux/pagemap.h> 61 #include <linux/init.h> 62 #include <linux/string.h> 63 #include <linux/highmem.h> 64 #include <linux/slab.h> 65 #include <linux/blkdev.h> 66 #include <linux/mount.h> 67 #include <linux/smp_lock.h> 68 #include <linux/parser.h> 69 #include <linux/backing-dev.h> 70 71 #include <asm/uaccess.h> 72 #include <linux/spinlock.h> 73 74 #include "linux/oracleasm/compat32.h" 75 #include "linux/oracleasm/kernel.h" 76 #include "linux/oracleasm/abi.h" 77 #include "linux/oracleasm/disk.h" 78 #include "linux/oracleasm/manager.h" 79 #include "linux/oracleasm/error.h" 80 81 #include "linux/oracleasm/module_version.h" 82 83 /* 84 * Modern kernels don't need this. Older kernels will have it defined 85 * by the compat code. 86 */ 87 #ifndef set_i_blksize 88 # define set_i_blksize(i, bs) do { /* Nothing */ } while (0) 89 #endif 90 91 92 #include "masklog.h" 93 #include "proc.h" 94 #if 0 95 #include "transaction_file.h" 96 #else 97 /* XXX ugly for now */ 98 #include "transaction_file.c" 99 #include "proc.c" 100 #endif 101 102 #if PAGE_CACHE_SIZE % 1024 103 #error Oh no, PAGE_CACHE_SIZE is not divisible by 1k! I cannot cope. 104 #endif /* PAGE_CACHE_SIZE % 1024 */ 105 106 107 108 /* 109 * Compat32 110 */ 111 #define ASM_BPL_32 32 112 #if BITS_PER_LONG == 32 113 # define asm_submit_io_32 asm_submit_io_native 114 # define asm_maybe_wait_io_32 asm_maybe_wait_io_native 115 # define asm_complete_ios_32 asm_complete_ios_native 116 #else 117 # if BITS_PER_LONG == 64 118 # define ASM_BPL_64 64 119 # define asm_submit_io_32 asm_submit_io_thunk 120 # define asm_submit_io_64 asm_submit_io_native 121 # define asm_maybe_wait_io_32 asm_maybe_wait_io_thunk 122 # define asm_maybe_wait_io_64 asm_maybe_wait_io_native 123 # define asm_complete_ios_32 asm_complete_ios_thunk 124 # define asm_complete_ios_64 asm_complete_ios_native 125 # endif /* BITS_PER_LONG == 64 */ 126 #endif /* BITS_PER_LONG == 32 */ 127 128 129 static struct super_operations asmfs_ops; 130 static struct file_operations asmfs_dir_operations; 131 static struct file_operations asmfs_file_operations; 132 static struct inode_operations asmfs_file_inode_operations; 133 static struct inode_operations asmfs_disk_dir_inode_operations; 134 static struct inode_operations asmfs_iid_dir_inode_operations; 135 136 static kmem_cache_t *asm_request_cachep; 137 static kmem_cache_t *asmfs_inode_cachep; 138 static kmem_cache_t *asmdisk_cachep; 139 140 /* 141 * asmfs super-block data in memory 142 */ 143 struct asmfs_sb_info { 144 struct super_block *asmfs_super; 145 /* Prevent races accessing the used block 146 * counts. Conceptually, this could probably be a semaphore, 147 * but the only thing we do while holding the lock is 148 * arithmetic, so there's no point */ 149 spinlock_t asmfs_lock; 150 151 /* It is important that at least the free counts below be 152 signed. free_XXX may become negative if a limit is changed 153 downwards (by a remount) below the current usage. */ 154 155 /* max number of inodes - controls # of instances */ 156 long max_inodes; 157 /* free_inodes = max_inodes - total number of inodes currently in use */ 158 long free_inodes; 159 160 unsigned long next_iid; 161 };
