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authorAlex Elder <elder@inktank.com>2013-04-01 10:48:40 -0500
committerSage Weil <sage@inktank.com>2013-05-01 21:17:50 -0700
commit3bf53337af27a3ccc6e0f433b081063cdf0a2bf6 (patch)
treea224b926731eb781daa5828f97ec1830d2aae89b /fs/ceph/super.c
parentb0270324c5a9a5157f565c2de34fb1071cfdce7c (diff)
downloadop-kernel-dev-3bf53337af27a3ccc6e0f433b081063cdf0a2bf6.zip
op-kernel-dev-3bf53337af27a3ccc6e0f433b081063cdf0a2bf6.tar.gz
ceph: set up page array mempool with correct size
In create_fs_client() a memory pool is set up be used for arrays of pages that might be needed in ceph_writepages_start() if memory is tight. There are two problems with the way it's initialized: - The size provided is the number of pages we want in the array, but it should be the number of bytes required for that many page pointers. - The number of pages computed can end up being 0, while we will always need at least one page. This patch fixes both of these problems. This resolves the two simple problems defined in: http://tracker.ceph.com/issues/4603 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Diffstat (limited to 'fs/ceph/super.c')
-rw-r--r--fs/ceph/super.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 6ddc0bc..7d377c9 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -479,6 +479,8 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
CEPH_FEATURE_FLOCK |
CEPH_FEATURE_DIRLAYOUTHASH;
const unsigned required_features = 0;
+ int page_count;
+ size_t size;
int err = -ENOMEM;
fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
@@ -522,8 +524,9 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
/* set up mempools */
err = -ENOMEM;
- fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
- fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
+ page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
+ size = sizeof (struct page *) * (page_count ? page_count : 1);
+ fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
if (!fsc->wb_pagevec_pool)
goto fail_trunc_wq;
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