ceph: move sb->wb_pagevec_pool to be a global mempool

When doing some testing recently, I hit some page allocation failures
on mount, when creating the wb_pagevec_pool for the mount. That
requires 128k (32 contiguous pages), and after thrashing the memory
during an xfstests run, sometimes that would fail.

128k for each mount seems like a lot to hold in reserve for a rainy
day, so let's change this to a global mempool that gets allocated
when the module is plugged in.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 9001a896ae8c..4c3c964b1c54 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -118,8 +118,6 @@ struct ceph_fs_client {
 
 	struct ceph_mds_client *mdsc;
 
-	/* writeback */
-	mempool_t *wb_pagevec_pool;
 	atomic_long_t writeback_count;
 
 	struct workqueue_struct *inode_wq;