Commit 41b6e41f authored Oct 02, 2013 by Maxim Patlasov Committed by Miklos Szeredi Nov 05, 2013

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>

parent 6eaf4782

fs/fuse/file.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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;

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