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atari floppy: Stop sharing request queue across multiple gendisks 

o Use one request queue per gendisk instead of sharing the queue.

o Don't have hardware. No compile testing or run time testing done. Completely
  untested.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Vivek Goyal 2010-09-24 20:35:45 +02:00 committed by Jens Axboe
parent 786029ff81
commit 639e2f2aa7
1 changed files with 39 additions and 11 deletions
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50
drivers/block/ataflop.c
View File

@ -79,8 +79,8 @@
#undef DEBUG
static struct request_queue *floppy_queue;
static struct request *fd_request;
static int fdc_queue;
/* Disk types: DD, HD, ED */
static struct atari_disk_type {
@ -1391,6 +1391,29 @@ static void setup_req_params( int drive )
ReqTrack, ReqSector, (unsigned long)ReqData ));
}
/*
* Round-robin between our available drives, doing one request from each
*/
static struct request *set_next_request(void)
{
struct request_queue *q;
int old_pos = fdc_queue;
struct request *rq;
do {
q = unit[fdc_queue].disk->queue;
if (++fdc_queue == FD_MAX_UNITS)
fdc_queue = 0;
if (q) {
rq = blk_fetch_request(q);
if (rq)
break;
}
} while (fdc_queue != old_pos);
return rq;
}
static void redo_fd_request(void)
{
@ -1405,7 +1428,7 @@ static void redo_fd_request(void)
repeat:
if (!fd_request) {
fd_request = blk_fetch_request(floppy_queue);
fd_request = set_next_request();
if (!fd_request)
goto the_end;
}
@ -1932,10 +1955,6 @@ static int __init atari_floppy_init (void)
PhysTrackBuffer = virt_to_phys(TrackBuffer);
BufferDrive = BufferSide = BufferTrack = -1;
floppy_queue = blk_init_queue(do_fd_request, &ataflop_lock);
if (!floppy_queue)
goto Enomem;
for (i = 0; i < FD_MAX_UNITS; i++) {
unit[i].track = -1;
unit[i].flags = 0;
@ -1944,7 +1963,10 @@ static int __init atari_floppy_init (void)
sprintf(unit[i].disk->disk_name, "fd%d", i);
unit[i].disk->fops = &floppy_fops;
unit[i].disk->private_data = &unit[i];
unit[i].disk->queue = floppy_queue;
unit[i].disk->queue = blk_init_queue(do_fd_request,
&ataflop_lock);
if (!unit[i].disk->queue)
goto Enomem;
set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
add_disk(unit[i].disk);
}
@ -1959,10 +1981,14 @@ static int __init atari_floppy_init (void)
return 0;
Enomem:
while (i--)
while (i--) {
struct request_queue *q = unit[i].disk->queue;
put_disk(unit[i].disk);
if (floppy_queue)
blk_cleanup_queue(floppy_queue);
if (q)
blk_cleanup_queue(q);
}
unregister_blkdev(FLOPPY_MAJOR, "fd");
return -ENOMEM;
}
@ -2011,12 +2037,14 @@ static void __exit atari_floppy_exit(void)
int i;
blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
for (i = 0; i < FD_MAX_UNITS; i++) {
struct request_queue *q = unit[i].disk->queue;
del_gendisk(unit[i].disk);
put_disk(unit[i].disk);
blk_cleanup_queue(q);
}
unregister_blkdev(FLOPPY_MAJOR, "fd");
blk_cleanup_queue(floppy_queue);
del_timer_sync(&fd_timer);
atari_stram_free( DMABuffer );
}