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scsi: add sd_unprep_fn to free discard page 

This fixes discard page leak by using q->unprep_rq_fn facility.

q->unprep_rq_fn is called when all the data buffer (req->bio and
scsi_data_buffer) in the request is freed.

sd_unprep() uses rq->buffer to free discard page allocated in
sd_prepare_discard().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
FUJITA Tomonori 2010-07-01 19:49:18 +09:00 committed by Jens Axboe
parent 28018c242a
commit f1126e950d
1 changed files with 11 additions and 1 deletions
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12
drivers/scsi/sd.c
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@ -425,6 +425,7 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
sector_t sector = bio->bi_sector;
unsigned int nr_sectors = bio_sectors(bio);
unsigned int len;
int ret;
struct page *page;
if (sdkp->device->sector_size == 4096) {
@ -465,7 +466,15 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
}
blk_add_request_payload(rq, page, len);
return scsi_setup_blk_pc_cmnd(sdp, rq);
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
rq->buffer = page_address(page);
return ret;
}
static void sd_unprep_fn(struct request_queue *q, struct request *rq)
{
if (rq->cmd_flags & REQ_DISCARD)
__free_page(virt_to_page(rq->buffer));
}
/**
@ -2242,6 +2251,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
sd_revalidate_disk(gd);
blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
gd->driverfs_dev = &sdp->sdev_gendev;
gd->flags = GENHD_FL_EXT_DEVT;