diff options
Diffstat (limited to 'drivers/block/xen-blkback/xenbus.c')
| -rw-r--r-- | drivers/block/xen-blkback/xenbus.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index 5fd2010..2c008af 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -114,6 +114,8 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid) spin_lock_init(&blkif->blk_ring_lock); atomic_set(&blkif->refcnt, 1); init_waitqueue_head(&blkif->wq); + init_completion(&blkif->drain_complete); + atomic_set(&blkif->drain, 0); blkif->st_print = jiffies; init_waitqueue_head(&blkif->waiting_to_free); @@ -272,6 +274,7 @@ VBD_SHOW(oo_req, "%d\n", be->blkif->st_oo_req); VBD_SHOW(rd_req, "%d\n", be->blkif->st_rd_req); VBD_SHOW(wr_req, "%d\n", be->blkif->st_wr_req); VBD_SHOW(f_req, "%d\n", be->blkif->st_f_req); +VBD_SHOW(ds_req, "%d\n", be->blkif->st_ds_req); VBD_SHOW(rd_sect, "%d\n", be->blkif->st_rd_sect); VBD_SHOW(wr_sect, "%d\n", be->blkif->st_wr_sect); @@ -280,6 +283,7 @@ static struct attribute *xen_vbdstat_attrs[] = { &dev_attr_rd_req.attr, &dev_attr_wr_req.attr, &dev_attr_f_req.attr, + &dev_attr_ds_req.attr, &dev_attr_rd_sect.attr, &dev_attr_wr_sect.attr, NULL @@ -419,6 +423,73 @@ int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt, return err; } +int 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; + + 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 (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; + } + } + } 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; +} +int xen_blkbk_barrier(struct xenbus_transaction xbt, + struct backend_info *be, int state) +{ + struct xenbus_device *dev = be->dev; + int err; + + err = xenbus_printf(xbt, dev->nodename, "feature-barrier", + "%d", state); + if (err) + xenbus_dev_fatal(dev, err, "writing feature-barrier"); + + return err; +} + /* * Entry point to this code when a new device is created. Allocate the basic * structures, and watch the store waiting for the hotplug scripts to tell us @@ -650,6 +721,11 @@ again: 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); + err = xenbus_printf(xbt, dev->nodename, "sectors", "%llu", (unsigned long long)vbd_sz(&be->blkif->vbd)); if (err) { |