From: Robert Yang Subject: [RFC 03/10] misc/util.c: create special file Date: Wed, 28 Aug 2013 13:25:53 +0800 Message-ID: <1377667560-20089-4-git-send-email-liezhi.yang@windriver.com> References: <1377667560-20089-1-git-send-email-liezhi.yang@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , To: Return-path: Received: from mail.windriver.com ([147.11.1.11]:63262 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754383Ab3H1Fah (ORCPT ); Wed, 28 Aug 2013 01:30:37 -0400 In-Reply-To: <1377667560-20089-1-git-send-email-liezhi.yang@windriver.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: The do_mknod_internal() is used for creating special file which is block, character and fifo, most of the code are from debugfs/debugfs.c, the debugfs/debugfs.c will be modified to use this function. Signed-off-by: Robert Yang --- misc/util.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/misc/util.c b/misc/util.c index 6d87393..c793b42 100644 --- a/misc/util.c +++ b/misc/util.c @@ -317,6 +317,76 @@ void dump_mmp_msg(struct mmp_struct *mmp, const char *msg) /* Make a special file which is block, character and fifo */ errcode_t do_mknod_internal(ext2_ino_t cwd, const char *name, struct stat *st) { + ext2_ino_t ino; + errcode_t retval; + struct ext2_inode inode; + char *func_name = "do_mknod_internal"; + unsigned long major, minor, mode; + int filetype; + + switch(st->st_mode & S_IFMT) { + case S_IFCHR: + mode = LINUX_S_IFCHR; + filetype = EXT2_FT_CHRDEV; + break; + case S_IFBLK: + mode = LINUX_S_IFBLK; + filetype = EXT2_FT_BLKDEV; + break; + case S_IFIFO: + mode = LINUX_S_IFIFO; + filetype = EXT2_FT_FIFO; + break; + } + + if (!(current_fs->flags & EXT2_FLAG_RW)) { + com_err(func_name, 0, "Filesystem opened read/only"); + return -1; + } + retval = ext2fs_new_inode(current_fs, cwd, 010755, 0, &ino); + if (retval) { + com_err(func_name, retval, 0); + return retval; + } + printf("Allocated inode: %u\n", ino); + retval = ext2fs_link(current_fs, cwd, name, ino, filetype); + if (retval == EXT2_ET_DIR_NO_SPACE) { + retval = ext2fs_expand_dir(current_fs, cwd); + if (retval) { + com_err(func_name, retval, "while expanding directory"); + return retval; + } + retval = ext2fs_link(current_fs, cwd, name, ino, filetype); + } + if (retval) { + com_err(name, retval, 0); + return -1; + } + if (ext2fs_test_inode_bitmap2(current_fs->inode_map, ino)) + com_err(func_name, 0, "Warning: inode already set"); + ext2fs_inode_alloc_stats2(current_fs, ino, +1, 0); + memset(&inode, 0, sizeof(inode)); + inode.i_mode = mode; + inode.i_atime = inode.i_ctime = inode.i_mtime = + current_fs->now ? current_fs->now : time(0); + + major = major(st->st_rdev); + minor = minor(st->st_rdev); + + if ((major < 256) && (minor < 256)) { + inode.i_block[0] = major * 256 + minor; + inode.i_block[1] = 0; + } else { + inode.i_block[0] = 0; + inode.i_block[1] = (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); + } + inode.i_links_count = 1; + + retval = ext2fs_write_new_inode(current_fs, ino, &inode); + if (retval) + com_err(func_name, retval, "while creating inode %u", ino); + + return retval; } /* Make a symlink name -> target */ -- 1.8.1.2