From ae7d33823bfc330e08b25c5fe4d25838ef7c77ce Mon Sep 17 00:00:00 2001 From: Robert Yang Date: Mon, 23 Dec 2013 03:13:28 -0500 Subject: [PATCH 03/11] misc/create_inode.c: create special file 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. Upstream-Status: Backport Signed-off-by: Robert Yang Reviewed-by: Darren Hart --- misc/create_inode.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) diff --git a/misc/create_inode.c b/misc/create_inode.c index b68b910..4da8aff 100644 --- a/misc/create_inode.c +++ b/misc/create_inode.c @@ -11,6 +11,78 @@ /* 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; + 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__, 0, "Filesystem opened read/only"); + return -1; + } + retval = ext2fs_new_inode(current_fs, cwd, 010755, 0, &ino); + if (retval) { + com_err(__func__, retval, 0); + return retval; + } + +#ifdef DEBUGFS + printf("Allocated inode: %u\n", ino); +#endif + 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__, 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__, 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__, retval, "while creating inode %u", ino); + + return retval; } /* Make a symlink name -> target */ -- 1.7.10.4