/* * GRUB -- GRand Unified Bootloader * Copyright (C) 1999,2000,2001,2002,2003,2004,2006,2007,2008,2009,2010,2011,2012,2013 Free Software Foundation, Inc. * * GRUB is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GRUB is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GRUB. If not, see . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include # include grub_uint64_t grub_util_get_fd_size (grub_util_fd_t fd, const char *name, unsigned *log_secsize) { unsigned long long nr; unsigned sector_size, log_sector_size; if (ioctl (fd, DKIOCGETBLOCKCOUNT, &nr)) return -1; if (ioctl (fd, DKIOCGETBLOCKSIZE, §or_size)) return -1; if (sector_size & (sector_size - 1) || !sector_size) return -1; for (log_sector_size = 0; (1 << log_sector_size) < sector_size; log_sector_size++); if (log_secsize) *log_secsize = log_sector_size; return nr << log_sector_size; } grub_util_fd_t grub_util_fd_open (const char *os_dev, int flags) { grub_util_fd_t ret; #ifdef O_LARGEFILE flags |= O_LARGEFILE; #endif #ifdef O_BINARY flags |= O_BINARY; #endif ret = open (os_dev, flags); /* If we can't have exclusive access, try shared access */ if (ret < 0) ret = open (os_dev, flags | O_SHLOCK); return ret; }