Bug fix: isohybrid image size was not aligned to cylinder boundary.
Now the cylinder size gets adjusted if the image does not fit into 1024 cyl.
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de3e21629f
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e035146e01
@ -1108,7 +1108,35 @@ int zero_writer_free_data(IsoImageWriter *writer)
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}
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static
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int zero_writer_create(Ecma119Image *target, uint32_t num_blocks)
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int tail_writer_compute_data_blocks(IsoImageWriter *writer)
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{
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int ret;
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Ecma119Image *target;
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struct iso_zero_writer_data_struct *data;
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target = writer->target;
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ret = iso_align_isohybrid(target, 0);
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if (ret < 0)
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return ret;
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data = (struct iso_zero_writer_data_struct *) writer->data;
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if (data->num_blocks != target->tail_blocks) {
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iso_msg_debug(target->image->id,
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"Aligned image size for isohybrid by %d blocks",
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target->tail_blocks - data->num_blocks);
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data->num_blocks = target->tail_blocks;
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}
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if (target->tail_blocks <= 0)
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return ISO_SUCCESS;
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ret = zero_writer_compute_data_blocks(writer);
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return ret;
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}
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/*
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@param flag bit0= use tail_writer_compute_data_blocks rather than
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zero_writer_compute_data_blocks
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*/
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static
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int zero_writer_create(Ecma119Image *target, uint32_t num_blocks, int flag)
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{
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IsoImageWriter *writer;
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struct iso_zero_writer_data_struct *data;
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@ -1124,7 +1152,11 @@ int zero_writer_create(Ecma119Image *target, uint32_t num_blocks)
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}
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data->num_blocks = num_blocks;
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if (flag & 1) {
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writer->compute_data_blocks = tail_writer_compute_data_blocks;
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} else {
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writer->compute_data_blocks = zero_writer_compute_data_blocks;
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}
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writer->write_vol_desc = zero_writer_write_vol_desc;
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writer->write_data = zero_writer_write_data;
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writer->free_data = zero_writer_free_data;
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@ -1695,9 +1727,9 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
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target->partition_secs_per_head = opts->partition_secs_per_head;
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target->partition_heads_per_cyl = opts->partition_heads_per_cyl;
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if (target->partition_secs_per_head == 0)
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target->partition_secs_per_head = 63;
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target->partition_secs_per_head = 32;
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if (target->partition_heads_per_cyl == 0)
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target->partition_heads_per_cyl = 255;
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target->partition_heads_per_cyl = 64;
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target->eff_partition_offset = 0;
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target->partition_root = NULL;
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target->partition_l_table_pos = 0;
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@ -1893,11 +1925,9 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
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/* IMPORTANT: This must be the last writer before the checksum writer */
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if (target->tail_blocks > 0) {
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ret = zero_writer_create(target, target->tail_blocks);
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ret = zero_writer_create(target, target->tail_blocks, 1);
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if (ret < 0)
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goto target_cleanup;
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}
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if ((target->md5_file_checksums & 1) || target->md5_session_checksum) {
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ret = checksum_writer_create(target);
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@ -1951,8 +1981,8 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
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if (i == el_torito_writer_index)
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continue;
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/* Exposing address of data start to IsoWriteOpts iand memorizing
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this address for for all files which have no block address:
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/* Exposing address of data start to IsoWriteOpts and memorizing
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this address for all files which have no block address:
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symbolic links, device files, empty data files.
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filesrc_writer_compute_data_blocks() and filesrc_writer_write_data()
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will account resp. write this single block.
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@ -3120,6 +3120,8 @@ int el_torito_seems_boot_info_table(ElToritoBootImage *bootimg, int flag);
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* Specifies options for ISOLINUX or GRUB boot images. This should only be used
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* if the type of boot image is known.
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*
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* @param bootimg
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* The image to set options on
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* @param options
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* bitmask style flag. The following values are defined:
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*
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@ -3147,8 +3149,6 @@ int el_torito_seems_boot_info_table(ElToritoBootImage *bootimg, int flag);
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* For that you need isolinux.bin from SYSLINUX 3.72 or later.
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* IMPORTANT: The application has to take care that the image
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* on media gets padded up to the next full MB.
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* @param bootimg
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* The image to set options on
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* @param flag
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* Reserved for future usage, set to 0.
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* @return
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@ -386,21 +386,19 @@ int make_isolinux_mbr(int32_t *img_blocks, uint32_t boot_lba,
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int part_offset, int part_number, int fs_type,
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uint8_t *buf, int flag)
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{
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uint32_t spc, id, part, nominal_part_size;
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uint32_t id, part, nominal_part_size;
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off_t hd_img_blocks, hd_boot_lba;
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char *wpt;
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/* For generating a weak random number */
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struct timeval tv;
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struct timezone tz;
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/* Pad image_size to a multiple of sector_count*head_count
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*/
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spc = head_count * sector_count;
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hd_img_blocks = ((off_t) *img_blocks) * (off_t) 4;
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if (hd_img_blocks % spc) {
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hd_img_blocks += spc - (hd_img_blocks % spc);
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*img_blocks = hd_img_blocks / 4 + !!(hd_img_blocks % 4);
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}
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/* Padding of image_size to a multiple of sector_count*head_count
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happens already at compute time and is implemented by
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an appropriate increase of Ecma119Image->tail_blocks.
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*/
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wpt = (char *) buf + 432;
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@ -809,3 +809,100 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
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return ISO_SUCCESS;
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}
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/* Choose *heads_per_cyl so that
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- *heads_per_cyl * secs_per_head * 1024 >= imgsize / 512
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- *heads_per_cyl * secs_per_head is divisible by 4
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- it is as small as possible (to reduce aligment overhead)
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- it is <= 255
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@return 1= success , 0= cannot achieve goals
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*/
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static
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int try_sph(off_t imgsize, int secs_per_head, int *heads_per_cyl, int flag)
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{
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off_t hd_blocks, hpc;
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hd_blocks= imgsize / 512;
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hpc = hd_blocks / secs_per_head / 1024;
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if (hpc * secs_per_head * 1024 < hd_blocks)
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hpc++;
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if ((secs_per_head % 4) == 0) {
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;
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} else if ((secs_per_head % 2) == 0) {
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hpc += (hpc % 2);
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} else if(hpc % 4) {
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hpc += 4 - (hpc % 4);
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}
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if (hpc > 255)
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return 0;
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*heads_per_cyl = hpc;
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return 1;
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}
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int iso_align_isohybrid(Ecma119Image *t, int flag)
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{
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int sa_type, ret;
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uint32_t img_blocks;
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off_t imgsize, cylsize = 0, frac;
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sa_type = (t->system_area_options >> 2) & 0x3f;
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if (sa_type != 0)
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return ISO_SUCCESS;
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img_blocks = t->curblock;
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imgsize = ((off_t) img_blocks) * (off_t) 2048;
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if ((t->system_area_options & 3)
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&& (off_t) (t->partition_heads_per_cyl * t->partition_secs_per_head
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* 1024) * (off_t) 512 < imgsize) {
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/* Choose small values which can represent the image size */
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/* First try 32 sectors per head */
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ret = try_sph(imgsize, 32, &(t->partition_heads_per_cyl), 0);
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if (ret == 1) {
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t->partition_secs_per_head = 32;
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} else {
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/* Did not work with 32. Try 63 */
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t->partition_secs_per_head = 63;
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ret = try_sph(imgsize, 63, &(t->partition_heads_per_cyl), 0);
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if (ret != 1)
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t->partition_heads_per_cyl = 255;
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}
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cylsize = t->partition_heads_per_cyl * t->partition_secs_per_head *512;
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frac = imgsize % cylsize;
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iso_msg_debug(t->image->id,
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"Automatically adjusted MBR geometry to %d/%d/%d",
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(int) (imgsize / cylsize + !!frac),
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t->partition_heads_per_cyl, t->partition_secs_per_head);
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}
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cylsize = 0;
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if (sa_type == 0 && t->catalog != NULL &&
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(t->catalog->bootimages[0]->isolinux_options & 0x0a) == 0x02) {
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/* Check for isolinux image with magic number of 3.72 and produce
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an MBR from our built-in template. (Deprecated since 31 Mar 2010)
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*/
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if (img_blocks >= 0x40000000)
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return ISO_SUCCESS;
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cylsize = 64 * 32 * 512;
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} else if (sa_type == 0 && (t->system_area_options & 2)) {
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/* Patch externally provided system area as isohybrid MBR */
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if (t->catalog == NULL || t->system_area_data == NULL) {
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/* isohybrid makes only sense together with ISOLINUX boot image
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and externally provided System Area.
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*/
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return ISO_ISOLINUX_CANT_PATCH;
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}
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cylsize = t->partition_heads_per_cyl * t->partition_secs_per_head
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* 512;
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}
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if (cylsize == 0)
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return ISO_SUCCESS;
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frac = imgsize % cylsize;
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imgsize += (frac > 0 ? cylsize - frac : 0);
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frac = imgsize - ((off_t) img_blocks) * (off_t) 2048;
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if (frac == 0)
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return ISO_SUCCESS;
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t->tail_blocks += frac / 2048 + !!(frac % 2048);
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return ISO_SUCCESS;
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}
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@ -46,6 +46,11 @@ int make_isohybrid_mbr(int bin_lba, int *img_blocks, char *mbr, int flag);
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*/
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int iso_write_system_area(Ecma119Image *t, uint8_t *buf);
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/**
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* Adjust t->tail_blocks to the eventual alignment needs of isohybrid booting.
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*/
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int iso_align_isohybrid(Ecma119Image *t, int flag);
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/**
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* Read the necessary ELF information from the first MIPS boot file.
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