AuxXxilium/linux_dsm_epyc7002
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swim: stop sharing request queue across multiple gendisks

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Compile-tested only (by hacking it to compile on x86).

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval 2017-03-27 23:28:46 -07:00 committed by Jens Axboe
parent 3a644142e8
commit 103db8b2df
1 changed files with 36 additions and 19 deletions
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55
drivers/block/swim.c
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@ -211,7 +211,7 @@ enum head {
struct swim_priv {
struct swim __iomem *base;
spinlock_t lock;
struct request_queue *queue;
int fdc_queue;
int floppy_count;
struct floppy_state unit[FD_MAX_UNIT];
};
@ -525,12 +525,33 @@ static int floppy_read_sectors(struct floppy_state *fs,
return 0;
}
static void redo_fd_request(struct request_queue *q)
static struct request *swim_next_request(struct swim_priv *swd)
{
struct request_queue *q;
struct request *rq;
int old_pos = swd->fdc_queue;
do {
q = swd->unit[swd->fdc_queue].disk->queue;
if (++swd->fdc_queue == swd->floppy_count)
swd->fdc_queue = 0;
if (q) {
rq = blk_fetch_request(q);
if (rq)
return rq;
}
} while (swd->fdc_queue != old_pos);
return NULL;
}
static void do_fd_request(struct request_queue *q)
{
struct swim_priv *swd = q->queuedata;
struct request *req;
struct floppy_state *fs;
req = blk_fetch_request(q);
req = swim_next_request(swd);
while (req) {
int err = -EIO;
@ -554,15 +575,10 @@ static void redo_fd_request(struct request_queue *q)
}
done:
if (!__blk_end_request_cur(req, err))
req = blk_fetch_request(q);
req = swim_next_request(swd);
}
}
static void do_fd_request(struct request_queue *q)
{
redo_fd_request(q);
}
static struct floppy_struct floppy_type[4] = {
{ 0, 0, 0, 0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing */
{ 720, 9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
@ -833,22 +849,25 @@ static int swim_floppy_init(struct swim_priv *swd)
return -EBUSY;
}
spin_lock_init(&swd->lock);
for (drive = 0; drive < swd->floppy_count; drive++) {
swd->unit[drive].disk = alloc_disk(1);
if (swd->unit[drive].disk == NULL) {
err = -ENOMEM;
goto exit_put_disks;
}
swd->unit[drive].disk->queue = blk_init_queue(do_fd_request,
&swd->lock);
if (!swd->unit[drive].disk->queue) {
err = -ENOMEM;
put_disk(swd->unit[drive].disk);
goto exit_put_disks;
}
swd->unit[drive].disk->queue->queuedata = swd;
swd->unit[drive].swd = swd;
}
spin_lock_init(&swd->lock);
swd->queue = blk_init_queue(do_fd_request, &swd->lock);
if (!swd->queue) {
err = -ENOMEM;
goto exit_put_disks;
}
for (drive = 0; drive < swd->floppy_count; drive++) {
swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
swd->unit[drive].disk->major = FLOPPY_MAJOR;
@ -856,7 +875,6 @@ static int swim_floppy_init(struct swim_priv *swd)
sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
swd->unit[drive].disk->fops = &floppy_fops;
swd->unit[drive].disk->private_data = &swd->unit[drive];
swd->unit[drive].disk->queue = swd->queue;
set_capacity(swd->unit[drive].disk, 2880);
add_disk(swd->unit[drive].disk);
}
@ -943,13 +961,12 @@ static int swim_remove(struct platform_device *dev)
for (drive = 0; drive < swd->floppy_count; drive++) {
del_gendisk(swd->unit[drive].disk);
blk_cleanup_queue(swd->unit[drive].disk->queue);
put_disk(swd->unit[drive].disk);
}
unregister_blkdev(FLOPPY_MAJOR, "fd");
blk_cleanup_queue(swd->queue);
/* eject floppies */
for (drive = 0; drive < swd->floppy_count; drive++)