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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@kernel.org>
Cc: Laurent Vivier <Laurent@lvivier.info>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo 2009-05-08 11:54:09 +09:00 committed by Jens Axboe
parent 9e31bebee2
commit 06b0608e2b
1 changed files with 23 additions and 24 deletions
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47
drivers/block/swim.c
View File

@ -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);
}
}
}