libburnia/libisofs
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Refusign cylinder alignment if it is impossible to do it exactly.

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This commit is contained in:
Thomas Schmitt 2011-03-04 11:24:36 +01:00
parent 43eae7502b
commit 2caf527f67
1 changed files with 20 additions and 5 deletions
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25
libisofs/system_area.c
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@ -844,13 +844,12 @@ int iso_align_isohybrid(Ecma119Image *t, int flag)
int sa_type, ret, always_align;
uint32_t img_blocks;
off_t imgsize, cylsize = 0, frac;
char msg[160];
sa_type = (t->system_area_options >> 2) & 0x3f;
if (sa_type != 0)
return ISO_SUCCESS;
always_align = (t->system_area_options >> 8) & 3;
if (always_align >= 2)
return ISO_SUCCESS;
img_blocks = t->curblock;
imgsize = ((off_t) img_blocks) * (off_t) 2048;
@ -871,12 +870,15 @@ int iso_align_isohybrid(Ecma119Image *t, int flag)
}
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",
sprintf(msg, "Automatically adjusted MBR geometry to %d/%d/%d",
(int) (imgsize / cylsize + !!frac),
t->partition_heads_per_cyl, t->partition_secs_per_head);
iso_msgs_submit(0, msg, 0, "NOTE", 0);
}
if (always_align >= 2)
return ISO_SUCCESS;
cylsize = 0;
if (t->catalog != NULL &&
(t->catalog->bootimages[0]->isolinux_options & 0x0a) == 0x02) {
@ -899,6 +901,12 @@ int iso_align_isohybrid(Ecma119Image *t, int flag)
}
if (cylsize == 0)
return ISO_SUCCESS;
if (((double) imgsize) / (double) cylsize > 1024.0) {
iso_msgs_submit(0,
"Image size exceeds 1024 cylinders. Cannot align partition.",
0, "WARNING", 0);
return ISO_SUCCESS;
}
frac = imgsize % cylsize;
imgsize += (frac > 0 ? cylsize - frac : 0);
@ -906,6 +914,13 @@ int iso_align_isohybrid(Ecma119Image *t, int flag)
frac = imgsize - ((off_t) img_blocks) * (off_t) 2048;
if (frac == 0)
return ISO_SUCCESS;
t->tail_blocks += frac / 2048 + !!(frac % 2048);
if (frac % 2048) {
sprintf(msg,
"Cylinder size %d not divisible by 2048. Cannot align partition.",
(int) cylsize);
iso_msgs_submit(0, msg, 0, "WARNING", 0);
} else {
t->tail_blocks += frac / 2048;
}
return ISO_SUCCESS;
}