diff options
| author | Joe Thornber <ejt@redhat.com> | 2015-07-03 10:22:42 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-07-05 21:59:37 -0400 |
| commit | a822c83e47d97cdef38c4352e1ef62d9f46cfe98 (patch) | |
| tree | 96a7061154282acf52ae7b2145d4669426073880 /drivers/md/dm-thin.c | |
| parent | 4c7e309340ff85072e96f529582d159002c36734 (diff) | |
dm thin: allocate the cell_sort_array dynamically
Given the pool's cell_sort_array holds 8192 pointers it triggers an
order 5 allocation via kmalloc. This order 5 allocation is prone to
failure as system memory gets more fragmented over time.
Fix this by allocating the cell_sort_array using vmalloc.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/dm-thin.c')
| -rw-r--r-- | drivers/md/dm-thin.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index c33f61a4cc28..8f015d924a24 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -18,6 +18,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> +#include <linux/vmalloc.h> #include <linux/sort.h> #include <linux/rbtree.h> @@ -268,7 +269,7 @@ struct pool { process_mapping_fn process_prepared_mapping; process_mapping_fn process_prepared_discard; - struct dm_bio_prison_cell *cell_sort_array[CELL_SORT_ARRAY_SIZE]; + struct dm_bio_prison_cell **cell_sort_array; }; static enum pool_mode get_pool_mode(struct pool *pool); @@ -2777,6 +2778,7 @@ static void __pool_destroy(struct pool *pool) { __pool_table_remove(pool); + vfree(pool->cell_sort_array); if (dm_pool_metadata_close(pool->pmd) < 0) DMWARN("%s: dm_pool_metadata_close() failed.", __func__); @@ -2889,6 +2891,13 @@ static struct pool *pool_create(struct mapped_device *pool_md, goto bad_mapping_pool; } + pool->cell_sort_array = vmalloc(sizeof(*pool->cell_sort_array) * CELL_SORT_ARRAY_SIZE); + if (!pool->cell_sort_array) { + *error = "Error allocating cell sort array"; + err_p = ERR_PTR(-ENOMEM); + goto bad_sort_array; + } + pool->ref_count = 1; pool->last_commit_jiffies = jiffies; pool->pool_md = pool_md; @@ -2897,6 +2906,8 @@ static struct pool *pool_create(struct mapped_device *pool_md, return pool; +bad_sort_array: + mempool_destroy(pool->mapping_pool); bad_mapping_pool: dm_deferred_set_destroy(pool->all_io_ds); bad_all_io_ds: |