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path: root/drivers/block/xen-blkback/blkback.c
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Diffstat (limited to 'drivers/block/xen-blkback/blkback.c')
-rw-r--r--drivers/block/xen-blkback/blkback.c84
1 files changed, 35 insertions, 49 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 15ec4db194d1..0088bf60f368 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -39,9 +39,6 @@
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/freezer.h>
-#include <linux/loop.h>
-#include <linux/falloc.h>
-#include <linux/fs.h>
#include <xen/events.h>
#include <xen/page.h>
@@ -362,7 +359,7 @@ static int xen_blkbk_map(struct blkif_request *req,
{
struct gnttab_map_grant_ref map[BLKIF_MAX_SEGMENTS_PER_REQUEST];
int i;
- int nseg = req->nr_segments;
+ int nseg = req->u.rw.nr_segments;
int ret = 0;
/*
@@ -416,30 +413,25 @@ static int xen_blkbk_map(struct blkif_request *req,
return ret;
}
-static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req)
+static int dispatch_discard_io(struct xen_blkif *blkif,
+ struct blkif_request *req)
{
int err = 0;
int status = BLKIF_RSP_OKAY;
struct block_device *bdev = blkif->vbd.bdev;
- if (blkif->blk_backend_type == BLKIF_BACKEND_PHY)
- /* just forward the discard request */
+ blkif->st_ds_req++;
+
+ xen_blkif_get(blkif);
+ if (blkif->blk_backend_type == BLKIF_BACKEND_PHY ||
+ blkif->blk_backend_type == BLKIF_BACKEND_FILE) {
+ unsigned long secure = (blkif->vbd.discard_secure &&
+ (req->u.discard.flag & BLKIF_DISCARD_SECURE)) ?
+ BLKDEV_DISCARD_SECURE : 0;
err = blkdev_issue_discard(bdev,
req->u.discard.sector_number,
req->u.discard.nr_sectors,
- GFP_KERNEL, 0);
- else if (blkif->blk_backend_type == BLKIF_BACKEND_FILE) {
- /* punch a hole in the backing file */
- struct loop_device *lo = bdev->bd_disk->private_data;
- struct file *file = lo->lo_backing_file;
-
- if (file->f_op->fallocate)
- err = file->f_op->fallocate(file,
- FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
- req->u.discard.sector_number << 9,
- req->u.discard.nr_sectors << 9);
- else
- err = -EOPNOTSUPP;
+ GFP_KERNEL, secure);
} else
err = -EOPNOTSUPP;
@@ -449,7 +441,9 @@ static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req)
} else if (err)
status = BLKIF_RSP_ERROR;
- make_response(blkif, req->id, req->operation, status);
+ make_response(blkif, req->u.discard.id, req->operation, status);
+ xen_blkif_put(blkif);
+ return err;
}
static void xen_blk_drain_io(struct xen_blkif *blkif)
@@ -573,8 +567,11 @@ __do_block_io_op(struct xen_blkif *blkif)
/* Apply all sanity checks to /private copy/ of request. */
barrier();
-
- if (dispatch_rw_block_io(blkif, &req, pending_req))
+ if (unlikely(req.operation == BLKIF_OP_DISCARD)) {
+ free_req(pending_req);
+ if (dispatch_discard_io(blkif, &req))
+ break;
+ } else if (dispatch_rw_block_io(blkif, &req, pending_req))
break;
/* Yield point for this unbounded loop. */
@@ -633,10 +630,6 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
blkif->st_f_req++;
operation = WRITE_FLUSH;
break;
- case BLKIF_OP_DISCARD:
- blkif->st_ds_req++;
- operation = REQ_DISCARD;
- break;
default:
operation = 0; /* make gcc happy */
goto fail_response;
@@ -644,9 +637,9 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
}
/* Check that the number of segments is sane. */
- nseg = req->nr_segments;
- if (unlikely(nseg == 0 && operation != WRITE_FLUSH &&
- operation != REQ_DISCARD) ||
+ nseg = req->u.rw.nr_segments;
+
+ if (unlikely(nseg == 0 && operation != WRITE_FLUSH) ||
unlikely(nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) {
pr_debug(DRV_PFX "Bad number of segments in request (%d)\n",
nseg);
@@ -654,12 +647,12 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
goto fail_response;
}
- preq.dev = req->handle;
+ preq.dev = req->u.rw.handle;
preq.sector_number = req->u.rw.sector_number;
preq.nr_sects = 0;
pending_req->blkif = blkif;
- pending_req->id = req->id;
+ pending_req->id = req->u.rw.id;
pending_req->operation = req->operation;
pending_req->status = BLKIF_RSP_OKAY;
pending_req->nr_pages = nseg;
@@ -707,7 +700,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
* the hypercall to unmap the grants - that is all done in
* xen_blkbk_unmap.
*/
- if (operation != REQ_DISCARD && xen_blkbk_map(req, pending_req, seg))
+ if (xen_blkbk_map(req, pending_req, seg))
goto fail_flush;
/*
@@ -739,23 +732,16 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
/* This will be hit if the operation was a flush or discard. */
if (!bio) {
- BUG_ON(operation != WRITE_FLUSH && operation != REQ_DISCARD);
+ BUG_ON(operation != WRITE_FLUSH);
- if (operation == WRITE_FLUSH) {
- bio = bio_alloc(GFP_KERNEL, 0);
- if (unlikely(bio == NULL))
- goto fail_put_bio;
+ bio = bio_alloc(GFP_KERNEL, 0);
+ if (unlikely(bio == NULL))
+ goto fail_put_bio;
- biolist[nbio++] = bio;
- bio->bi_bdev = preq.bdev;
- bio->bi_private = pending_req;
- bio->bi_end_io = end_block_io_op;
- } else if (operation == REQ_DISCARD) {
- xen_blk_discard(blkif, req);
- xen_blkif_put(blkif);
- free_req(pending_req);
- return 0;
- }
+ biolist[nbio++] = bio;
+ bio->bi_bdev = preq.bdev;
+ bio->bi_private = pending_req;
+ bio->bi_end_io = end_block_io_op;
}
/*
@@ -784,7 +770,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
xen_blkbk_unmap(pending_req);
fail_response:
/* Haven't submitted any bio's yet. */
- make_response(blkif, req->id, req->operation, BLKIF_RSP_ERROR);
+ make_response(blkif, req->u.rw.id, req->operation, BLKIF_RSP_ERROR);
free_req(pending_req);
msleep(1); /* back off a bit */
return -EIO;
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-14 15:23:09 +0000