basebuilder_pel7ppc64bebuilder0
6 years ago
1 changed files with 210 additions and 0 deletions
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From 28b08b639aeaadbfcc3fb66558e6b392b2b5d44c Mon Sep 17 00:00:00 2001 |
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From: Karel Zak <kzak@redhat.com> |
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Date: Tue, 28 Jun 2016 11:30:21 +0200 |
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Subject: [PATCH 82/86] fdisk: backport DOS logical partitions chain reorder |
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|
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... from the current upstream. |
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Addresses: http://bugzilla.redhat.com/show_bug.cgi?id=1304246 |
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Signed-off-by: Karel Zak <kzak@redhat.com> |
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--- |
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fdisks/fdiskdoslabel.c | 170 +++++++++++++++++++++++++++++++++---------------- |
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1 file changed, 116 insertions(+), 54 deletions(-) |
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diff --git a/fdisks/fdiskdoslabel.c b/fdisks/fdiskdoslabel.c |
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index fe04ac7..b7eb35a 100644 |
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--- a/fdisks/fdiskdoslabel.c |
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+++ b/fdisks/fdiskdoslabel.c |
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@@ -55,6 +55,22 @@ static int MBRbuffer_changed; |
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#define cround(c, n) (fdisk_context_use_cylinders(c) ? \ |
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((n) / fdisk_context_get_units_per_sector(c)) + 1 : (n)) |
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|
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+ |
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+static unsigned long long |
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+get_abs_partition_start(struct pte *pe) |
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+{ |
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+ return pe->offset + get_start_sect(pe->part_table); |
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+} |
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+ |
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+static unsigned long long |
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+get_abs_partition_end(struct pte *pe) |
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+{ |
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+ unsigned long long size; |
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+ |
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+ size = get_nr_sects(pe->part_table); |
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+ return get_abs_partition_start(pe) + size - (size ? 1 : 0); |
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+} |
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+ |
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static void warn_alignment(struct fdisk_context *cxt) |
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{ |
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if (nowarn) |
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@@ -1254,67 +1270,113 @@ void dos_list_table_expert(struct fdisk_context *cxt, int extend) |
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} |
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} |
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|
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-/* |
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- * Fix the chain of logicals. |
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- * extended_offset is unchanged, the set of sectors used is unchanged |
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- * The chain is sorted so that sectors increase, and so that |
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- * starting sectors increase. |
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- * |
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- * After this it may still be that cfdisk doesn't like the table. |
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- * (This is because cfdisk considers expanded parts, from link to |
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- * end of partition, and these may still overlap.) |
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- * Now |
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- * sfdisk /dev/hda > ohda; sfdisk /dev/hda < ohda |
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- * may help. |
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- */ |
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+ |
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+static void print_chain_of_logicals(struct fdisk_context *cxt) |
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+{ |
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+ size_t i; |
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+ |
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+ fputc('\n', stdout); |
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+ |
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+ for (i = 4; i < cxt->label->nparts_max; i++) { |
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+ struct pte *pe = &ptes[i]; |
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+ |
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+ fprintf(stderr, "#%02zu EBR [%10ju], " |
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+ "data[start=%10ju (%10ju), size=%10ju], " |
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+ "link[start=%10ju (%10ju), size=%10ju]\n", |
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+ i, (uintmax_t) pe->offset, |
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+ /* data */ |
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+ (uintmax_t) get_start_sect(pe->part_table), |
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+ (uintmax_t) get_abs_partition_start(pe), |
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+ (uintmax_t) get_nr_sects(pe->part_table), |
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+ /* link */ |
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+ (uintmax_t) get_start_sect(pe->ext_pointer), |
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+ (uintmax_t) (extended_offset + get_start_sect(pe->ext_pointer)), |
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+ (uintmax_t) get_nr_sects(pe->ext_pointer)); |
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+ } |
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+} |
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+ |
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+static int cmp_ebr_offsets(const void *a, const void *b) |
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+{ |
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+ struct pte *ae = (struct pte *) a, |
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+ *be = (struct pte *) b; |
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+ |
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+ if (ae->offset == 0 && be->offset == 0) |
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+ return 0; |
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+ if (ae->offset == 0) |
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+ return 1; |
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+ if (be->offset == 0) |
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+ return -1; |
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+ |
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+ return cmp_numbers(ae->offset, be->offset); |
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+} |
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+ |
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static void fix_chain_of_logicals(struct fdisk_context *cxt) |
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{ |
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- size_t j, oj, ojj, sj, sjj; |
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- struct partition *pj,*pjj,tmp; |
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- |
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- /* Stage 1: sort sectors but leave sector of part 4 */ |
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- /* (Its sector is the global extended_offset.) */ |
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- stage1: |
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- for (j = 5; j < cxt->label->nparts_max - 1; j++) { |
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- oj = ptes[j].offset; |
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- ojj = ptes[j+1].offset; |
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- if (oj > ojj) { |
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- ptes[j].offset = ojj; |
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- ptes[j+1].offset = oj; |
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- pj = ptes[j].part_table; |
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- set_start_sect(pj, get_start_sect(pj)+oj-ojj); |
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- pjj = ptes[j+1].part_table; |
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- set_start_sect(pjj, get_start_sect(pjj)+ojj-oj); |
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- set_start_sect(ptes[j-1].ext_pointer, |
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- ojj-extended_offset); |
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- set_start_sect(ptes[j].ext_pointer, |
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- oj-extended_offset); |
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- goto stage1; |
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+ struct pte *last; |
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+ size_t i; |
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+ |
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+ DBG(CONTEXT, print_chain_of_logicals(cxt)); |
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+ |
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+ /* Sort chain by EBR offsets */ |
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+ qsort(&ptes[4], cxt->label->nparts_max - 4, sizeof(struct pte), |
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+ cmp_ebr_offsets); |
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+ |
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+again: |
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+ /* Sort data partitions by start */ |
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+ for (i = 4; i < cxt->label->nparts_max - 1; i++) { |
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+ struct pte *cur = &ptes[i], |
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+ *nxt = &ptes[i + 1]; |
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+ |
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+ if (get_abs_partition_start(cur) > |
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+ get_abs_partition_start(nxt)) { |
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+ |
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+ struct partition tmp = *cur->part_table; |
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+ sector_t cur_start = get_abs_partition_start(cur), |
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+ nxt_start = get_abs_partition_start(nxt); |
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+ |
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+ /* swap data partitions */ |
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+ *cur->part_table = *nxt->part_table; |
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+ *nxt->part_table = tmp; |
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+ |
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+ /* Recount starts according to EBR offsets, the absolute |
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+ * address still has to be the same! */ |
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+ set_start_sect(cur->part_table, nxt_start - cur->offset); |
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+ set_start_sect(nxt->part_table, cur_start - nxt->offset); |
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+ |
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+ cur->changed = 1; |
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+ nxt->changed = 1; |
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+ goto again; |
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} |
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} |
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|
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- /* Stage 2: sort starting sectors */ |
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- stage2: |
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- for (j = 4; j < cxt->label->nparts_max - 1; j++) { |
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- pj = ptes[j].part_table; |
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- pjj = ptes[j+1].part_table; |
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- sj = get_start_sect(pj); |
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- sjj = get_start_sect(pjj); |
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- oj = ptes[j].offset; |
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- ojj = ptes[j+1].offset; |
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- if (oj+sj > ojj+sjj) { |
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- tmp = *pj; |
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- *pj = *pjj; |
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- *pjj = tmp; |
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- set_start_sect(pj, ojj+sjj-oj); |
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- set_start_sect(pjj, oj+sj-ojj); |
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- goto stage2; |
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- } |
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+ /* Update EBR links */ |
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+ for (i = 4; i < cxt->label->nparts_max - 1; i++) { |
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+ struct pte *cur = &ptes[i], |
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+ *nxt = &ptes[i + 1]; |
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+ |
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+ sector_t noff = nxt->offset - extended_offset, |
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+ ooff = get_start_sect(cur->ext_pointer); |
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+ |
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+ if (noff == ooff) |
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+ continue; |
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+ |
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+ DBG(CONTEXT, dbgprint("DOS: fix EBR [%10ju] link %ju -> %ju", |
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+ (uintmax_t) cur->offset, |
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+ (uintmax_t) ooff, (uintmax_t) noff)); |
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+ |
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+ set_partition(cxt, i, 1, nxt->offset, |
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+ get_abs_partition_end(nxt), |
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+ EXTENDED); |
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+ } |
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+ |
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+ /* always terminate the chain ! */ |
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+ last = &ptes[cxt->label->nparts_max - 1]; |
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+ if (last) { |
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+ clear_partition(last->ext_pointer); |
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+ last->changed = 1; |
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} |
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|
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- /* Probably something was changed */ |
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- for (j = 4; j < cxt->label->nparts_max; j++) |
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- ptes[j].changed = 1; |
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+ DBG(CONTEXT, print_chain_of_logicals(cxt)); |
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} |
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|
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void dos_fix_partition_table_order(struct fdisk_context *cxt) |
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-- |
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2.7.4 |
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