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dm verity fec: fix GFP flags used with mempool_alloc()

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mempool_alloc() cannot fail for GFP_NOIO allocation, so there is no
point testing for failure.

One place the code tested for failure was passing "0" as the GFP
flags.  This is most unusual and is probably meant to be GFP_NOIO,
so that is changed.

Also, allocation from ->extra_pool and ->prealloc_pool are repeated
before releasing the previous allocation.  This can deadlock if the code
is servicing a write under high memory pressure.  To avoid deadlocks,
change these to use GFP_NOWAIT and leave the error handling in place.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
NeilBrown 2017-04-10 12:13:00 +10:00 committed by Mike Snitzer
parent 4218a95546
commit 34c96507e8
1 changed files with 5 additions and 16 deletions
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21
drivers/md/dm-verity-fec.c
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@ -308,19 +308,14 @@ static int fec_alloc_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio)
{
unsigned n;
if (!fio->rs) {
fio->rs = mempool_alloc(v->fec->rs_pool, 0);
if (unlikely(!fio->rs)) {
DMERR("failed to allocate RS");
return -ENOMEM;
}
}
if (!fio->rs)
fio->rs = mempool_alloc(v->fec->rs_pool, GFP_NOIO);
fec_for_each_prealloc_buffer(n) {
if (fio->bufs[n])
continue;
fio->bufs[n] = mempool_alloc(v->fec->prealloc_pool, GFP_NOIO);
fio->bufs[n] = mempool_alloc(v->fec->prealloc_pool, GFP_NOWAIT);
if (unlikely(!fio->bufs[n])) {
DMERR("failed to allocate FEC buffer");
return -ENOMEM;
@ -332,22 +327,16 @@ static int fec_alloc_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio)
if (fio->bufs[n])
continue;
fio->bufs[n] = mempool_alloc(v->fec->extra_pool, GFP_NOIO);
fio->bufs[n] = mempool_alloc(v->fec->extra_pool, GFP_NOWAIT);
/* we can manage with even one buffer if necessary */
if (unlikely(!fio->bufs[n]))
break;
}
fio->nbufs = n;
if (!fio->output) {
if (!fio->output)
fio->output = mempool_alloc(v->fec->output_pool, GFP_NOIO);
if (!fio->output) {
DMERR("failed to allocate FEC page");
return -ENOMEM;
}
}
return 0;
}