136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/* grub-setup.c - make GRUB usable */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <assert.h>
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#include <sys/ioctl.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/fiemap.h>
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#include <grub/disk.h>
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#include <grub/partition.h>
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#include <grub/util/misc.h>
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#include <grub/util/install.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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void
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grub_install_get_blocklist (grub_device_t root_dev,
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const char *core_path,
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const char *core_img __attribute__ ((unused)),
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size_t core_size,
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void (*callback) (grub_disk_addr_t sector,
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unsigned offset,
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unsigned length,
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void *data),
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void *hook_data)
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{
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grub_partition_t container = root_dev->disk->partition;
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grub_uint64_t container_start = grub_partition_get_start (container);
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struct fiemap fie1;
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int fd;
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/* Write the first two sectors of the core image onto the disk. */
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grub_util_info ("opening the core image `%s'", core_path);
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fd = open (core_path, O_RDONLY);
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if (fd < 0)
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grub_util_error (_("cannot open `%s': %s"), core_path,
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strerror (errno));
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grub_memset (&fie1, 0, sizeof (fie1));
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fie1.fm_length = core_size;
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fie1.fm_flags = FIEMAP_FLAG_SYNC;
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if (ioctl (fd, FS_IOC_FIEMAP, &fie1) < 0)
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{
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int nblocks, i;
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int bsize;
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int mul;
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grub_util_info ("FIEMAP failed. Reverting to FIBMAP");
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if (ioctl (fd, FIGETBSZ, &bsize) < 0)
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grub_util_error (_("can't retrieve blocklists: %s"),
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strerror (errno));
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if (bsize & (GRUB_DISK_SECTOR_SIZE - 1))
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grub_util_error ("%s", _("blocksize is not divisible by 512"));
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if (!bsize)
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grub_util_error ("%s", _("invalid zero blocksize"));
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mul = bsize >> GRUB_DISK_SECTOR_BITS;
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nblocks = (core_size + bsize - 1) / bsize;
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if (mul == 0 || nblocks == 0)
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grub_util_error ("%s", _("can't retrieve blocklists"));
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for (i = 0; i < nblocks; i++)
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{
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unsigned blk = i;
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int rest;
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if (ioctl (fd, FIBMAP, &blk) < 0)
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grub_util_error (_("can't retrieve blocklists: %s"),
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strerror (errno));
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rest = core_size - ((i * mul) << GRUB_DISK_SECTOR_BITS);
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if (rest <= 0)
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break;
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if (rest > GRUB_DISK_SECTOR_SIZE * mul)
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rest = GRUB_DISK_SECTOR_SIZE * mul;
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callback (((grub_uint64_t) blk) * mul
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+ container_start,
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0, rest, hook_data);
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}
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}
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else
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{
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struct fiemap *fie2;
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int i;
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fie2 = xmalloc (sizeof (*fie2)
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+ fie1.fm_mapped_extents
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* sizeof (fie1.fm_extents[1]));
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memset (fie2, 0, sizeof (*fie2)
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+ fie1.fm_mapped_extents * sizeof (fie2->fm_extents[1]));
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fie2->fm_length = core_size;
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fie2->fm_flags = FIEMAP_FLAG_SYNC;
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fie2->fm_extent_count = fie1.fm_mapped_extents;
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if (ioctl (fd, FS_IOC_FIEMAP, fie2) < 0)
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grub_util_error (_("can't retrieve blocklists: %s"),
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strerror (errno));
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for (i = 0; i < fie2->fm_mapped_extents; i++)
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{
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callback ((fie2->fm_extents[i].fe_physical
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>> GRUB_DISK_SECTOR_BITS)
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+ container_start,
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fie2->fm_extents[i].fe_physical
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& (GRUB_DISK_SECTOR_SIZE - 1),
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fie2->fm_extents[i].fe_length, hook_data);
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}
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free (fie2);
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}
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close (fd);
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}
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