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.
This commit is contained in:
Thomas Schmitt 2011-03-01 18:31:59 +01:00
parent de3e21629f
commit e035146e01
5 changed files with 151 additions and 21 deletions

View File

@ -1108,7 +1108,35 @@ int zero_writer_free_data(IsoImageWriter *writer)
}
static
int zero_writer_create(Ecma119Image *target, uint32_t num_blocks)
int tail_writer_compute_data_blocks(IsoImageWriter *writer)
{
int ret;
Ecma119Image *target;
struct iso_zero_writer_data_struct *data;
target = writer->target;
ret = iso_align_isohybrid(target, 0);
if (ret < 0)
return ret;
data = (struct iso_zero_writer_data_struct *) writer->data;
if (data->num_blocks != target->tail_blocks) {
iso_msg_debug(target->image->id,
"Aligned image size for isohybrid by %d blocks",
target->tail_blocks - data->num_blocks);
data->num_blocks = target->tail_blocks;
}
if (target->tail_blocks <= 0)
return ISO_SUCCESS;
ret = zero_writer_compute_data_blocks(writer);
return ret;
}
/*
@param flag bit0= use tail_writer_compute_data_blocks rather than
zero_writer_compute_data_blocks
*/
static
int zero_writer_create(Ecma119Image *target, uint32_t num_blocks, int flag)
{
IsoImageWriter *writer;
struct iso_zero_writer_data_struct *data;
@ -1124,7 +1152,11 @@ int zero_writer_create(Ecma119Image *target, uint32_t num_blocks)
}
data->num_blocks = num_blocks;
writer->compute_data_blocks = zero_writer_compute_data_blocks;
if (flag & 1) {
writer->compute_data_blocks = tail_writer_compute_data_blocks;
} else {
writer->compute_data_blocks = zero_writer_compute_data_blocks;
}
writer->write_vol_desc = zero_writer_write_vol_desc;
writer->write_data = zero_writer_write_data;
writer->free_data = zero_writer_free_data;
@ -1695,9 +1727,9 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
target->partition_secs_per_head = opts->partition_secs_per_head;
target->partition_heads_per_cyl = opts->partition_heads_per_cyl;
if (target->partition_secs_per_head == 0)
target->partition_secs_per_head = 63;
target->partition_secs_per_head = 32;
if (target->partition_heads_per_cyl == 0)
target->partition_heads_per_cyl = 255;
target->partition_heads_per_cyl = 64;
target->eff_partition_offset = 0;
target->partition_root = NULL;
target->partition_l_table_pos = 0;
@ -1893,11 +1925,9 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
/* IMPORTANT: This must be the last writer before the checksum writer */
if (target->tail_blocks > 0) {
ret = zero_writer_create(target, target->tail_blocks);
if (ret < 0)
goto target_cleanup;
}
ret = zero_writer_create(target, target->tail_blocks, 1);
if (ret < 0)
goto target_cleanup;
if ((target->md5_file_checksums & 1) || target->md5_session_checksum) {
ret = checksum_writer_create(target);
@ -1951,8 +1981,8 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
if (i == el_torito_writer_index)
continue;
/* Exposing address of data start to IsoWriteOpts iand memorizing
this address for for all files which have no block address:
/* Exposing address of data start to IsoWriteOpts and memorizing
this address for all files which have no block address:
symbolic links, device files, empty data files.
filesrc_writer_compute_data_blocks() and filesrc_writer_write_data()
will account resp. write this single block.

View File

@ -3120,6 +3120,8 @@ int el_torito_seems_boot_info_table(ElToritoBootImage *bootimg, int flag);
* Specifies options for ISOLINUX or GRUB boot images. This should only be used
* if the type of boot image is known.
*
* @param bootimg
* The image to set options on
* @param options
* bitmask style flag. The following values are defined:
*
@ -3147,8 +3149,6 @@ int el_torito_seems_boot_info_table(ElToritoBootImage *bootimg, int flag);
* For that you need isolinux.bin from SYSLINUX 3.72 or later.
* IMPORTANT: The application has to take care that the image
* on media gets padded up to the next full MB.
* @param bootimg
* The image to set options on
* @param flag
* Reserved for future usage, set to 0.
* @return

View File

@ -386,21 +386,19 @@ int make_isolinux_mbr(int32_t *img_blocks, uint32_t boot_lba,
int part_offset, int part_number, int fs_type,
uint8_t *buf, int flag)
{
uint32_t spc, id, part, nominal_part_size;
uint32_t id, part, nominal_part_size;
off_t hd_img_blocks, hd_boot_lba;
char *wpt;
/* For generating a weak random number */
struct timeval tv;
struct timezone tz;
/* Pad image_size to a multiple of sector_count*head_count
*/
spc = head_count * sector_count;
hd_img_blocks = ((off_t) *img_blocks) * (off_t) 4;
if (hd_img_blocks % spc) {
hd_img_blocks += spc - (hd_img_blocks % spc);
*img_blocks = hd_img_blocks / 4 + !!(hd_img_blocks % 4);
}
/* Padding of image_size to a multiple of sector_count*head_count
happens already at compute time and is implemented by
an appropriate increase of Ecma119Image->tail_blocks.
*/
wpt = (char *) buf + 432;

View File

@ -809,3 +809,100 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
return ISO_SUCCESS;
}
/* Choose *heads_per_cyl so that
- *heads_per_cyl * secs_per_head * 1024 >= imgsize / 512
- *heads_per_cyl * secs_per_head is divisible by 4
- it is as small as possible (to reduce aligment overhead)
- it is <= 255
@return 1= success , 0= cannot achieve goals
*/
static
int try_sph(off_t imgsize, int secs_per_head, int *heads_per_cyl, int flag)
{
off_t hd_blocks, hpc;
hd_blocks= imgsize / 512;
hpc = hd_blocks / secs_per_head / 1024;
if (hpc * secs_per_head * 1024 < hd_blocks)
hpc++;
if ((secs_per_head % 4) == 0) {
;
} else if ((secs_per_head % 2) == 0) {
hpc += (hpc % 2);
} else if(hpc % 4) {
hpc += 4 - (hpc % 4);
}
if (hpc > 255)
return 0;
*heads_per_cyl = hpc;
return 1;
}
int iso_align_isohybrid(Ecma119Image *t, int flag)
{
int sa_type, ret;
uint32_t img_blocks;
off_t imgsize, cylsize = 0, frac;
sa_type = (t->system_area_options >> 2) & 0x3f;
if (sa_type != 0)
return ISO_SUCCESS;
img_blocks = t->curblock;
imgsize = ((off_t) img_blocks) * (off_t) 2048;
if ((t->system_area_options & 3)
&& (off_t) (t->partition_heads_per_cyl * t->partition_secs_per_head
* 1024) * (off_t) 512 < imgsize) {
/* Choose small values which can represent the image size */
/* First try 32 sectors per head */
ret = try_sph(imgsize, 32, &(t->partition_heads_per_cyl), 0);
if (ret == 1) {
t->partition_secs_per_head = 32;
} else {
/* Did not work with 32. Try 63 */
t->partition_secs_per_head = 63;
ret = try_sph(imgsize, 63, &(t->partition_heads_per_cyl), 0);
if (ret != 1)
t->partition_heads_per_cyl = 255;
}
cylsize = t->partition_heads_per_cyl * t->partition_secs_per_head *512;
frac = imgsize % cylsize;
iso_msg_debug(t->image->id,
"Automatically adjusted MBR geometry to %d/%d/%d",
(int) (imgsize / cylsize + !!frac),
t->partition_heads_per_cyl, t->partition_secs_per_head);
}
cylsize = 0;
if (sa_type == 0 && t->catalog != NULL &&
(t->catalog->bootimages[0]->isolinux_options & 0x0a) == 0x02) {
/* Check for isolinux image with magic number of 3.72 and produce
an MBR from our built-in template. (Deprecated since 31 Mar 2010)
*/
if (img_blocks >= 0x40000000)
return ISO_SUCCESS;
cylsize = 64 * 32 * 512;
} else if (sa_type == 0 && (t->system_area_options & 2)) {
/* Patch externally provided system area as isohybrid MBR */
if (t->catalog == NULL || t->system_area_data == NULL) {
/* isohybrid makes only sense together with ISOLINUX boot image
and externally provided System Area.
*/
return ISO_ISOLINUX_CANT_PATCH;
}
cylsize = t->partition_heads_per_cyl * t->partition_secs_per_head
* 512;
}
if (cylsize == 0)
return ISO_SUCCESS;
frac = imgsize % cylsize;
imgsize += (frac > 0 ? cylsize - frac : 0);
frac = imgsize - ((off_t) img_blocks) * (off_t) 2048;
if (frac == 0)
return ISO_SUCCESS;
t->tail_blocks += frac / 2048 + !!(frac % 2048);
return ISO_SUCCESS;
}

View File

@ -46,6 +46,11 @@ int make_isohybrid_mbr(int bin_lba, int *img_blocks, char *mbr, int flag);
*/
int iso_write_system_area(Ecma119Image *t, uint8_t *buf);
/**
* Adjust t->tail_blocks to the eventual alignment needs of isohybrid booting.
*/
int iso_align_isohybrid(Ecma119Image *t, int flag);
/**
* Read the necessary ELF information from the first MIPS boot file.