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Fix efi_use_whole_disk() when efi_nparts == 128. 

Commit e5dc681a changed EFI_NUMPAR from 9 to 128. This means that the
on-disk EFI label has efi_nparts = 128 instead of 9. The index of the
reserved partition, however, is still 8. This breaks
efi_use_whole_disk(), which uses efi_nparts-1 as the index of the
reserved partition.

This commit fixes efi_use_whole_disk() when the index of the reserved
partition is not efi_nparts-1. It rewrites the algorithm and makes it
more robust by using the order of the partitions instead of their
numbering. It assumes that the last non-empty partition is the reserved
partition, and that the non-empty partition before that is the data
partition.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #808
This commit is contained in:
Etienne Dechamps 2012-07-11 17:47:10 +02:00 committed by Brian Behlendorf
parent 7608bd0dd0
commit cee43a7477
1 changed files with 26 additions and 24 deletions
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50
lib/libefi/rdwr_efi.c
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@ -1028,24 +1028,15 @@ efi_use_whole_disk(int fd)
struct dk_gpt *efi_label;
int rval;
int i;
uint_t phy_last_slice = 0;
diskaddr_t pl_start = 0;
diskaddr_t pl_size;
uint_t resv_index = 0, data_index = 0;
diskaddr_t resv_start = 0, data_start = 0;
diskaddr_t difference;
rval = efi_alloc_and_read(fd, &efi_label);
if (rval < 0) {
return (rval);
}
/* find the last physically non-zero partition */
for (i = 0; i < efi_label->efi_nparts - 2; i ++) {
if (pl_start < efi_label->efi_parts[i].p_start) {
pl_start = efi_label->efi_parts[i].p_start;
phy_last_slice = i;
}
}
pl_size = efi_label->efi_parts[phy_last_slice].p_size;
/*
* If alter_lba is 1, we are using the backup label.
* Since we can locate the backup label by disk capacity,
@ -1061,16 +1052,28 @@ efi_use_whole_disk(int fd)
return (VT_ENOSPC);
}
difference = efi_label->efi_last_lba - efi_label->efi_altern_lba;
/*
* If there is space between the last physically non-zero partition
* and the reserved partition, just add the unallocated space to this
* area. Otherwise, the unallocated space is added to the last
* physically non-zero partition.
* Find the last physically non-zero partition.
* This is the reserved partition.
*/
if (pl_start + pl_size - 1 == efi_label->efi_last_u_lba -
EFI_MIN_RESV_SIZE) {
efi_label->efi_parts[phy_last_slice].p_size +=
efi_label->efi_last_lba - efi_label->efi_altern_lba;
for (i = 0; i < efi_label->efi_nparts; i ++) {
if (resv_start < efi_label->efi_parts[i].p_start) {
resv_start = efi_label->efi_parts[i].p_start;
resv_index = i;
}
}
/*
* Find the last physically non-zero partition before that.
* This is the data partition.
*/
for (i = 0; i < resv_index; i ++) {
if (data_start < efi_label->efi_parts[i].p_start) {
data_start = efi_label->efi_parts[i].p_start;
data_index = i;
}
}
/*
@ -1078,10 +1081,9 @@ efi_use_whole_disk(int fd)
* here except fabricated devids (which get generated via
* efi_write()). So there is no need to copy data.
*/
efi_label->efi_parts[efi_label->efi_nparts - 1].p_start +=
efi_label->efi_last_lba - efi_label->efi_altern_lba;
efi_label->efi_last_u_lba += efi_label->efi_last_lba
- efi_label->efi_altern_lba;
efi_label->efi_parts[data_index].p_size += difference;
efi_label->efi_parts[resv_index].p_start += difference;
efi_label->efi_last_u_lba += difference;
rval = efi_write(fd, efi_label);
if (rval < 0) {