diff options
Diffstat (limited to 'grub-core/osdep/linux/blocklist.c')
| -rw-r--r-- | grub-core/osdep/linux/blocklist.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/grub-core/osdep/linux/blocklist.c b/grub-core/osdep/linux/blocklist.c new file mode 100644 index 0000000..c77d608 --- /dev/null +++ b/grub-core/osdep/linux/blocklist.c @@ -0,0 +1,136 @@ +/* grub-setup.c - make GRUB usable */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011 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 <http://www.gnu.org/licenses/>. + */ + +#include <config.h> + +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <dirent.h> +#include <assert.h> +#include <sys/ioctl.h> +#include <linux/types.h> +#include <linux/fs.h> +#include <linux/fiemap.h> + +#include <grub/disk.h> +#include <grub/partition.h> +#include <grub/util/misc.h> +#include <grub/util/install.h> +#include <errno.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +void +grub_install_get_blocklist (grub_device_t root_dev, + const char *core_path, + const char *core_img __attribute__ ((unused)), + size_t core_size, + void (*callback) (grub_disk_addr_t sector, + unsigned offset, + unsigned length, + void *data), + void *hook_data) +{ + grub_partition_t container = root_dev->disk->partition; + grub_uint64_t container_start = grub_partition_get_start (container); + struct fiemap fie1; + int fd; + + /* Write the first two sectors of the core image onto the disk. */ + grub_util_info ("opening the core image `%s'", core_path); + fd = open (core_path, O_RDONLY); + if (fd < 0) + grub_util_error (_("cannot open `%s': %s"), core_path, + strerror (errno)); + + grub_memset (&fie1, 0, sizeof (fie1)); + fie1.fm_length = core_size; + fie1.fm_flags = FIEMAP_FLAG_SYNC; + + if (ioctl (fd, FS_IOC_FIEMAP, &fie1) < 0) + { + int nblocks, i; + int bsize; + int mul; + + grub_util_info ("FIEMAP failed. Reverting to FIBMAP"); + + if (ioctl (fd, FIGETBSZ, &bsize) < 0) + grub_util_error (_("can't retrieve blocklists: %s"), + strerror (errno)); + if (bsize & (GRUB_DISK_SECTOR_SIZE - 1)) + grub_util_error ("%s", _("blocksize is not divisible by 512")); + if (!bsize) + grub_util_error ("%s", _("invalid zero blocksize")); + mul = bsize >> GRUB_DISK_SECTOR_BITS; + nblocks = (core_size + bsize - 1) / bsize; + if (mul == 0 || nblocks == 0) + grub_util_error ("%s", _("can't retrieve blocklists")); + for (i = 0; i < nblocks; i++) + { + unsigned blk = i; + int rest; + if (ioctl (fd, FIBMAP, &blk) < 0) + grub_util_error (_("can't retrieve blocklists: %s"), + strerror (errno)); + + rest = core_size - ((i * mul) << GRUB_DISK_SECTOR_BITS); + if (rest <= 0) + break; + if (rest > GRUB_DISK_SECTOR_SIZE * mul) + rest = GRUB_DISK_SECTOR_SIZE * mul; + callback (((grub_uint64_t) blk) * mul + + container_start, + 0, rest, hook_data); + } + } + else + { + struct fiemap *fie2; + int i; + fie2 = xmalloc (sizeof (*fie2) + + fie1.fm_mapped_extents + * sizeof (fie1.fm_extents[1])); + memset (fie2, 0, sizeof (*fie2) + + fie1.fm_mapped_extents * sizeof (fie2->fm_extents[1])); + fie2->fm_length = core_size; + fie2->fm_flags = FIEMAP_FLAG_SYNC; + fie2->fm_extent_count = fie1.fm_mapped_extents; + if (ioctl (fd, FS_IOC_FIEMAP, fie2) < 0) + grub_util_error (_("can't retrieve blocklists: %s"), + strerror (errno)); + for (i = 0; i < fie2->fm_mapped_extents; i++) + { + callback ((fie2->fm_extents[i].fe_physical + >> GRUB_DISK_SECTOR_BITS) + + container_start, + fie2->fm_extents[i].fe_physical + & (GRUB_DISK_SECTOR_SIZE - 1), + fie2->fm_extents[i].fe_length, hook_data); + } + free (fie2); + } + close (fd); +} |