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alloc: Correct existing use of positional fill.

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Perform two allocation attempts with cling if maximise_cling is set,
first with then without positional fill.

Avoid segfaults from confusion between positional and sorted sequential
allocation when number of stripes varies as reported here:
https://www.redhat.com/archives/linux-lvm/2014-March/msg00001.html
This commit is contained in:
Alasdair G Kergon 2014-04-15 02:34:35 +01:00
parent 1bf4c3a1fa
commit 8980592514
1 changed files with 27 additions and 17 deletions
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44
lib/metadata/lv_manip.c
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@ -1276,18 +1276,18 @@ static void _init_alloc_parms(struct alloc_handle *ah,
* areas if the number of areas matches.
*/
if (alloc_parms->prev_lvseg &&
((ah->area_count + ah->parity_count) == prev_lvseg->area_count))
((ah->area_count + ah->parity_count) == prev_lvseg->area_count)) {
alloc_parms->flags |= A_AREA_COUNT_MATCHES;
/* Are there any preceding segments we must follow on from? */
if (alloc_parms->prev_lvseg &&
(alloc_parms->flags & A_AREA_COUNT_MATCHES)) {
alloc_parms->flags |= A_POSITIONAL_FILL;
if (alloc_parms->alloc == ALLOC_CONTIGUOUS)
/* Are there any preceding segments we must follow on from? */
if (alloc_parms->alloc == ALLOC_CONTIGUOUS) {
alloc_parms->flags |= A_CONTIGUOUS_TO_LVSEG;
else if ((alloc_parms->alloc == ALLOC_CLING) ||
(alloc_parms->alloc == ALLOC_CLING_BY_TAGS))
alloc_parms->flags |= A_POSITIONAL_FILL;
} else if ((alloc_parms->alloc == ALLOC_CLING) ||
(alloc_parms->alloc == ALLOC_CLING_BY_TAGS)) {
alloc_parms->flags |= A_CLING_TO_LVSEG;
alloc_parms->flags |= A_POSITIONAL_FILL;
}
} else
/*
* A cling allocation that follows a successful contiguous
@ -1916,7 +1916,7 @@ static area_use_t _check_pva(struct alloc_handle *ah, struct pv_area *pva, uint3
if (!iteration_count && !log_iteration_count && alloc_parms->flags & (A_CONTIGUOUS_TO_LVSEG | A_CLING_TO_LVSEG | A_CLING_TO_ALLOCED)) {
/* Contiguous? */
if (((alloc_parms->flags & A_CONTIGUOUS_TO_LVSEG) ||
(ah->maximise_cling && alloc_parms->prev_lvseg && (alloc_parms->flags & A_AREA_COUNT_MATCHES))) &&
(ah->maximise_cling && (alloc_parms->flags & A_AREA_COUNT_MATCHES))) &&
_check_contiguous(ah->cmd, alloc_parms->prev_lvseg, pva, alloc_state))
goto found;
@ -1926,7 +1926,7 @@ static area_use_t _check_pva(struct alloc_handle *ah, struct pv_area *pva, uint3
/* Cling to prev_lvseg? */
if (((alloc_parms->flags & A_CLING_TO_LVSEG) ||
(ah->maximise_cling && alloc_parms->prev_lvseg && (alloc_parms->flags & A_AREA_COUNT_MATCHES))) &&
(ah->maximise_cling && (alloc_parms->flags & A_AREA_COUNT_MATCHES))) &&
_check_cling(ah, NULL, alloc_parms->prev_lvseg, pva, alloc_state))
/* If this PV is suitable, use this first area */
goto found;
@ -1940,7 +1940,7 @@ static area_use_t _check_pva(struct alloc_handle *ah, struct pv_area *pva, uint3
if (!(alloc_parms->flags & A_CLING_BY_TAGS) || !ah->cling_tag_list_cn)
return NEXT_PV;
if (alloc_parms->prev_lvseg && (alloc_parms->flags & A_AREA_COUNT_MATCHES)) {
if ((alloc_parms->flags & A_AREA_COUNT_MATCHES)) {
if (_check_cling(ah, ah->cling_tag_list_cn, alloc_parms->prev_lvseg, pva, alloc_state))
goto found;
} else if (_check_cling_to_alloced(ah, ah->cling_tag_list_cn, pva, alloc_state))
@ -2078,10 +2078,11 @@ static int _find_some_parallel_space(struct alloc_handle *ah,
/* ix_offset holds the number of parallel allocations that must be contiguous/cling */
/* At most one of A_CONTIGUOUS_TO_LVSEG, A_CLING_TO_LVSEG or A_CLING_TO_ALLOCED may be set */
if (alloc_parms->flags & (A_CONTIGUOUS_TO_LVSEG | A_CLING_TO_LVSEG))
if (!(alloc_parms->flags & A_POSITIONAL_FILL))
ix_offset = 0;
else if (alloc_parms->flags & (A_CONTIGUOUS_TO_LVSEG | A_CLING_TO_LVSEG))
ix_offset = _stripes_per_mimage(alloc_parms->prev_lvseg) * alloc_parms->prev_lvseg->area_count;
if (alloc_parms->flags & A_CLING_TO_ALLOCED)
else if (alloc_parms->flags & A_CLING_TO_ALLOCED)
ix_offset = ah->area_count;
if (alloc_parms->alloc == ALLOC_NORMAL || (alloc_parms->flags & A_CLING_TO_ALLOCED))
@ -2089,7 +2090,9 @@ static int _find_some_parallel_space(struct alloc_handle *ah,
alloc_parms->flags & A_CLING_TO_ALLOCED ? "" : "not ");
if (alloc_parms->flags & A_POSITIONAL_FILL)
log_debug_alloc("Preferred areas are filled positionally.");
log_debug_alloc("%u preferred area(s) to be filled positionally.", ix_offset);
else
log_debug_alloc("Areas to be sorted and filled sequentially.");
_clear_areas(alloc_state);
_reset_unreserved(pvms);
@ -2217,7 +2220,8 @@ static int _find_some_parallel_space(struct alloc_handle *ah,
(ix + preferred_count >= devices_needed) &&
(ix + preferred_count < devices_needed + alloc_state->log_area_count_still_needed) && !log_iteration_count++));
if (preferred_count < ix_offset && !(alloc_parms->flags & A_CLING_TO_ALLOCED))
/* Non-zero ix means at least one USE_AREA was returned */
if (preferred_count < ix_offset && !(alloc_parms->flags & A_CLING_TO_ALLOCED) && !ix)
return 1;
if (ix + preferred_count < devices_needed + alloc_state->log_area_count_still_needed)
@ -2339,6 +2343,9 @@ static int _find_max_parallel_space_for_one_policy(struct alloc_handle *ah, stru
return_0;
/*
* For ALLOC_CLING, if the number of areas matches and maximise_cling is
* set we allow two passes, first with A_POSITIONAL_FILL then without.
*
* If we didn't allocate anything this time with ALLOC_NORMAL and had
* A_CLING_TO_ALLOCED set, try again without it.
*
@ -2347,7 +2354,10 @@ static int _find_max_parallel_space_for_one_policy(struct alloc_handle *ah, stru
* remain on the same disks where possible.
*/
if (old_allocated == alloc_state->allocated) {
if ((alloc_parms->alloc == ALLOC_NORMAL) && (alloc_parms->flags & A_CLING_TO_ALLOCED))
if (ah->maximise_cling && ((alloc_parms->alloc == ALLOC_CLING) || (alloc_parms->alloc == ALLOC_CLING_BY_TAGS)) &&
(alloc_parms->flags & A_CLING_TO_LVSEG) && (alloc_parms->flags & A_POSITIONAL_FILL))
alloc_parms->flags &= ~A_POSITIONAL_FILL;
else if ((alloc_parms->alloc == ALLOC_NORMAL) && (alloc_parms->flags & A_CLING_TO_ALLOCED))
alloc_parms->flags &= ~A_CLING_TO_ALLOCED;
else
break; /* Give up */