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authorMikulas Patocka <mpatocka@redhat.com>2009-06-22 10:12:13 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-06-22 10:12:13 +0100
commita72986c562eeec3f7b992198c168f0f41606fe53 (patch)
tree2ee7051fa43c04ab0d72487b249aa733ec129703 /drivers/md/dm-region-hash.c
parente54f77ddda72781ec1c1696b21aabd6a30cbb7c6 (diff)
downloadop-kernel-dev-a72986c562eeec3f7b992198c168f0f41606fe53.zip
op-kernel-dev-a72986c562eeec3f7b992198c168f0f41606fe53.tar.gz
dm raid1: keep retrying alloc if mempool_alloc failed
If the code can't handle allocation failures, use __GFP_NOFAIL so that in case of memory pressure the allocator will retry indefinitely and won't return NULL which would cause a crash in the function. This is still not a correct fix, it may cause a classic deadlock when memory manager waits for I/O being done and I/O waits for some free memory. I/O code shouldn't allocate any memory. But in this case it probably doesn't matter much in practice, people usually do not swap on RAID. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-region-hash.c')
-rw-r--r--drivers/md/dm-region-hash.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c
index 7b899be..36dbe29 100644
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -283,7 +283,7 @@ static struct dm_region *__rh_alloc(struct dm_region_hash *rh, region_t region)
nreg = mempool_alloc(rh->region_pool, GFP_ATOMIC);
if (unlikely(!nreg))
- nreg = kmalloc(sizeof(*nreg), GFP_NOIO);
+ nreg = kmalloc(sizeof(*nreg), GFP_NOIO | __GFP_NOFAIL);
nreg->state = rh->log->type->in_sync(rh->log, region, 1) ?
DM_RH_CLEAN : DM_RH_NOSYNC;
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