fuse: writepages: update bdi writeout when deleting secondary request

BDI_WRITTEN counter is used to estimate bdi bandwidth.  It must be
incremented every time as bdi ends page writeback.  No matter whether it
was fulfilled by actual write or by discarding the request (e.g. due to
shrunk i_size).

Note that even before writepages patches, the case "Got truncated off
completely" was handled in fuse_send_writepage() by calling
fuse_writepage_finish() which updated BDI_WRITTEN unconditionally.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Maxim Patlasov 2013-10-02 21:38:43 +04:00 коммит произвёл Miklos Szeredi
Родитель 6eaf4782eb
Коммит 41b6e41fc6
1 изменённых файлов: 4 добавлений и 1 удалений

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@ -1701,11 +1701,14 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
if (old_req->num_pages == 1 && (old_req->state == FUSE_REQ_INIT ||
old_req->state == FUSE_REQ_PENDING)) {
struct backing_dev_info *bdi = page->mapping->backing_dev_info;
copy_highpage(old_req->pages[0], page);
spin_unlock(&fc->lock);
dec_bdi_stat(page->mapping->backing_dev_info, BDI_WRITEBACK);
dec_bdi_stat(bdi, BDI_WRITEBACK);
dec_zone_page_state(page, NR_WRITEBACK_TEMP);
bdi_writeout_inc(bdi);
fuse_writepage_free(fc, new_req);
fuse_request_free(new_req);
goto out;