linux-kernel - [PATCH 3/4] fuse: writepage: update bdi writeout when deleting secondary request

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 02 Oct 2013 21:38:43 +0400
From:	Maxim Patlasov <MPatlasov@...allels.com>
To:	miklos@...redi.hu
Cc:	fuse-devel@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] fuse: writepage: 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@...allels.com>
---
 fs/fuse/file.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a3c7123..5d323bd 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1536,6 +1536,7 @@ static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
 			drop->inode->i_mapping->backing_dev_info;
 		dec_bdi_stat(bdi, BDI_WRITEBACK);
 		dec_zone_page_state(drop->pages[0], NR_WRITEBACK_TEMP);
+		bdi_writeout_inc(bdi);
 		fuse_writepage_free(fc, drop);
 		fuse_put_request(fc, drop);
 		drop = next;
@@ -1706,11 +1707,14 @@ 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;

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/