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| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-06-22 10:12:13 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-06-22 10:12:13 +0100 |
| commit | a72986c562eeec3f7b992198c168f0f41606fe53 (patch) | |
| tree | 2ee7051fa43c04ab0d72487b249aa733ec129703 /drivers/md | |
| parent | e54f77ddda72781ec1c1696b21aabd6a30cbb7c6 (diff) | |
| download | linux-a72986c562eeec3f7b992198c168f0f41606fe53.tar.gz linux-a72986c562eeec3f7b992198c168f0f41606fe53.tar.bz2 linux-a72986c562eeec3f7b992198c168f0f41606fe53.zip | |
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')
| -rw-r--r-- | drivers/md/dm-region-hash.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c index 7b899be0b087..36dbe29f2fd6 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; |