mm: count reclaimable pages per BDI

Count per BDI reclaimable pages; nr_reclaimable = nr_dirty + nr_unstable.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 9 insertions, 0 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index faceb5eecca9..86e58b1dcd9c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -710,6 +710,8 @@ static int __set_page_dirty(struct page *page,
 
                 if (mapping_cap_account_dirty(mapping)) {
                         __inc_zone_page_state(page, NR_FILE_DIRTY);
+                        __inc_bdi_stat(mapping->backing_dev_info,
+                                        BDI_RECLAIMABLE);
                         task_io_account_write(PAGE_CACHE_SIZE);
                 }
                 radix_tree_tag_set(&mapping->page_tree,
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 82d7ee98c675..0cf9d1cd9bd2 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -447,6 +447,7 @@ nfs_mark_request_commit(struct nfs_page *req)
                         NFS_PAGE_TAG_COMMIT);
         spin_unlock(&inode->i_lock);
         inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
+        inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE);
         __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 }
 
@@ -533,6 +534,8 @@ static void nfs_cancel_commit_list(struct list_head *head)
         while(!list_empty(head)) {
                 req = nfs_list_entry(head->next);
                 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
+                dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
+                                BDI_RECLAIMABLE);
                 nfs_list_remove_request(req);
                 clear_bit(PG_NEED_COMMIT, &(req)->wb_flags);
                 nfs_inode_remove_request(req);
@@ -1193,6 +1196,8 @@ nfs_commit_list(struct inode *inode, struct list_head *head, int how)
                 nfs_list_remove_request(req);
                 nfs_mark_request_commit(req);
                 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
+                dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
+                                BDI_RECLAIMABLE);
                 nfs_clear_page_tag_locked(req);
         }
         return -ENOMEM;
@@ -1218,6 +1223,8 @@ static void nfs_commit_done(struct rpc_task *task, void *calldata)
                 nfs_list_remove_request(req);
                 clear_bit(PG_NEED_COMMIT, &(req)->wb_flags);
                 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
+                dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
+                                BDI_RECLAIMABLE);
 
                 dprintk("NFS: commit (%s/%Ld %d@%Ld)",
                         req->wb_context->path.dentry->d_inode->i_sb->s_id,