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Merge branch 'stable/for-jens-3.4-bugfixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-3.4/drivers 

Konrad writes:

I've two small fixes for the xen-blkback - and I think one more will show up
eventually (a partial revert), but not sure when. So in the spirit of keeping
the patches flowing, please git pull the following branch.
pull/124/head
Jens Axboe 2012-03-26 09:13:14 +02:00
parent 22be2e6e13 3389bb8bf7
commit 6674fb79ca
3 changed files with 41 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/block/xen-blkback/blkback.c
View File

@ -398,21 +398,18 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
int err = 0;
int status = BLKIF_RSP_OKAY;
struct block_device *bdev = blkif->vbd.bdev;
unsigned long secure;
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, secure);
} else
err = -EOPNOTSUPP;
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, secure);
if (err == -EOPNOTSUPP) {
pr_debug(DRV_PFX "discard op failed, not supported\n");

6
drivers/block/xen-blkback/common.h
View File

@ -146,11 +146,6 @@ enum blkif_protocol {
BLKIF_PROTOCOL_X86_64 = 3,
};
enum blkif_backend_type {
BLKIF_BACKEND_PHY = 1,
BLKIF_BACKEND_FILE = 2,
};
struct xen_vbd {
/* What the domain refers to this vbd as. */
blkif_vdev_t handle;
@ -177,7 +172,6 @@ struct xen_blkif {
unsigned int irq;
/* Comms information. */
enum blkif_protocol blk_protocol;
enum blkif_backend_type blk_backend_type;
union blkif_back_rings blk_rings;
void *blk_ring;
/* The VBD attached to this interface. */

91
drivers/block/xen-blkback/xenbus.c
View File

@ -381,72 +381,49 @@ int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
err = xenbus_printf(xbt, dev->nodename, "feature-flush-cache",
"%d", state);
if (err)
xenbus_dev_fatal(dev, err, "writing feature-flush-cache");
dev_warn(&dev->dev, "writing feature-flush-cache (%d)", err);
return err;
}
int xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info *be)
static void xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info *be)
{
struct xenbus_device *dev = be->dev;
struct xen_blkif *blkif = be->blkif;
char *type;
int err;
int state = 0;
struct block_device *bdev = be->blkif->vbd.bdev;
struct request_queue *q = bdev_get_queue(bdev);
type = xenbus_read(XBT_NIL, dev->nodename, "type", NULL);
if (!IS_ERR(type)) {
if (strncmp(type, "file", 4) == 0) {
state = 1;
blkif->blk_backend_type = BLKIF_BACKEND_FILE;
if (blk_queue_discard(q)) {
err = xenbus_printf(xbt, dev->nodename,
"discard-granularity", "%u",
q->limits.discard_granularity);
if (err) {
dev_warn(&dev->dev, "writing discard-granularity (%d)", err);
return;
}
if (strncmp(type, "phy", 3) == 0) {
struct block_device *bdev = be->blkif->vbd.bdev;
struct request_queue *q = bdev_get_queue(bdev);
if (blk_queue_discard(q)) {
err = xenbus_printf(xbt, dev->nodename,
"discard-granularity", "%u",
q->limits.discard_granularity);
if (err) {
xenbus_dev_fatal(dev, err,
"writing discard-granularity");
goto kfree;
}
err = xenbus_printf(xbt, dev->nodename,
"discard-alignment", "%u",
q->limits.discard_alignment);
if (err) {
xenbus_dev_fatal(dev, err,
"writing discard-alignment");
goto kfree;
}
state = 1;
blkif->blk_backend_type = BLKIF_BACKEND_PHY;
}
/* Optional. */
err = xenbus_printf(xbt, dev->nodename,
"discard-secure", "%d",
blkif->vbd.discard_secure);
if (err) {
xenbus_dev_fatal(dev, err,
"writting discard-secure");
goto kfree;
}
err = xenbus_printf(xbt, dev->nodename,
"discard-alignment", "%u",
q->limits.discard_alignment);
if (err) {
dev_warn(&dev->dev, "writing discard-alignment (%d)", err);
return;
}
state = 1;
/* Optional. */
err = xenbus_printf(xbt, dev->nodename,
"discard-secure", "%d",
blkif->vbd.discard_secure);
if (err) {
dev_warn(dev-dev, "writing discard-secure (%d)", err);
return;
}
} else {
err = PTR_ERR(type);
xenbus_dev_fatal(dev, err, "reading type");
goto out;
}
err = xenbus_printf(xbt, dev->nodename, "feature-discard",
"%d", state);
if (err)
xenbus_dev_fatal(dev, err, "writing feature-discard");
kfree:
kfree(type);
out:
return err;
dev_warn(&dev->dev, "writing feature-discard (%d)", err);
}
int xen_blkbk_barrier(struct xenbus_transaction xbt,
struct backend_info *be, int state)
@ -457,7 +434,7 @@ int xen_blkbk_barrier(struct xenbus_transaction xbt,
err = xenbus_printf(xbt, dev->nodename, "feature-barrier",
"%d", state);
if (err)
xenbus_dev_fatal(dev, err, "writing feature-barrier");
dev_warn(&dev->dev, "writing feature-barrier (%d)", err);
return err;
}
@ -689,14 +666,12 @@ again:
return;
}
err = xen_blkbk_flush_diskcache(xbt, be, be->blkif->vbd.flush_support);
if (err)
goto abort;
err = xen_blkbk_discard(xbt, be);
/* If we can't advertise it is OK. */
err = xen_blkbk_barrier(xbt, be, be->blkif->vbd.flush_support);
xen_blkbk_flush_diskcache(xbt, be, be->blkif->vbd.flush_support);
xen_blkbk_discard(xbt, be);
xen_blkbk_barrier(xbt, be, be->blkif->vbd.flush_support);
err = xenbus_printf(xbt, dev->nodename, "sectors", "%llu",
(unsigned long long)vbd_sz(&be->blkif->vbd));