linux-kernel - [PATCH 11/18] swim: dequeue in-flight 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:	Fri,  8 May 2009 11:54:09 +0900
From:	Tejun Heo <tj@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, rusty@...tcorp.com.au,
	James.Bottomley@...senPartnership.com, mike.miller@...com,
	donari75@...il.com, paul.clements@...eleye.com, tim@...erelk.net,
	Geert.Uytterhoeven@...ycom.com, davem@...emloft.net,
	Laurent@...vier.info, jgarzik@...ox.com, jeremy@...source.com,
	grant.likely@...retlab.ca, adrian@...en.demon.co.uk,
	sfr@...b.auug.org.au, bzolnier@...il.com, petkovbb@...glemail.com,
	sshtylyov@...mvista.com, oakad@...oo.com, drzeus@...eus.cx,
	dwmw2@...radead.org, Markus.Lidel@...dowconnect.com,
	wein@...ibm.com, schwidefsky@...ibm.com, zaitcev@...hat.com,
	fujita.tomonori@....ntt.co.jp, axboe@...nel.dk
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 11/18] swim: dequeue in-flight request

swim processes requests one-by-one synchronously and can easily be
converted to dequeuing model.  Convert it.

[ Impact: dequeue in-flight request ]

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Laurent Vivier <Laurent@...vier.info>
---
 drivers/block/swim.c |   47 +++++++++++++++++++++++------------------------
 1 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index fc6a1c3..dedd489 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -514,7 +514,7 @@ static int floppy_read_sectors(struct floppy_state *fs,
 			ret = swim_read_sector(fs, side, track, sector,
 						buffer);
 			if (try-- == 0)
-				return -1;
+				return -EIO;
 		} while (ret != 512);
 
 		buffer += ret;
@@ -528,38 +528,37 @@ static void redo_fd_request(struct request_queue *q)
 	struct request *req;
 	struct floppy_state *fs;
 
-	while ((req = elv_next_request(q))) {
+	req = elv_next_request(q);
+	if (req)
+		blkdev_dequeue_request(req);
+
+	while (req) {
+		int err = -EIO;
 
 		fs = req->rq_disk->private_data;
-		if (blk_rq_pos(req) >= fs->total_secs) {
-			__blk_end_request_cur(req, -EIO);
-			continue;
-		}
-		if (!fs->disk_in) {
-			__blk_end_request_cur(req, -EIO);
-			continue;
-		}
-		if (rq_data_dir(req) == WRITE) {
-			if (fs->write_protected) {
-				__blk_end_request_cur(req, -EIO);
-				continue;
-			}
-		}
+		if (blk_rq_pos(req) >= fs->total_secs)
+			goto done;
+		if (!fs->disk_in)
+			goto done;
+		if (rq_data_dir(req) == WRITE && fs->write_protected)
+			goto done;
+
 		switch (rq_data_dir(req)) {
 		case WRITE:
 			/* NOT IMPLEMENTED */
-			__blk_end_request_cur(req, -EIO);
 			break;
 		case READ:
-			if (floppy_read_sectors(fs, blk_rq_pos(req),
-						blk_rq_cur_sectors(req),
-						req->buffer)) {
-				__blk_end_request_cur(req, -EIO);
-				continue;
-			}
-			__blk_end_request_cur(req, 0);
+			err = floppy_read_sectors(fs, blk_rq_pos(req),
+						  blk_rq_cur_sectors(req),
+						  req->buffer);
 			break;
 		}
+	done:
+		if (!__blk_end_request_cur(req, err)) {
+			req = elv_next_request(q);
+			if (req)
+				blkdev_dequeue_request(req);
+		}
 	}
 }
 
-- 
1.6.0.2

--
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/