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Merge branch 'stable/for-jens-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus

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This commit is contained in:
Jens Axboe 2015-06-27 11:47:07 -06:00
commit 6443af9855
4 changed files with 225 additions and 110 deletions
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13
drivers/block/xen-blkback/blkback.c
View File

@ -83,6 +83,13 @@ module_param_named(max_persistent_grants, xen_blkif_max_pgrants, int, 0644);
MODULE_PARM_DESC(max_persistent_grants,
"Maximum number of grants to map persistently");
/*
* Maximum order of pages to be used for the shared ring between front and
* backend, 4KB page granularity is used.
*/
unsigned int xen_blkif_max_ring_order = XENBUS_MAX_RING_PAGE_ORDER;
module_param_named(max_ring_page_order, xen_blkif_max_ring_order, int, S_IRUGO);
MODULE_PARM_DESC(max_ring_page_order, "Maximum order of pages to be used for the shared ring");
/*
* The LRU mechanism to clean the lists of persistent grants needs to
* be executed periodically. The time interval between consecutive executions
@ -1438,6 +1445,12 @@ static int __init xen_blkif_init(void)
if (!xen_domain())
return -ENODEV;
if (xen_blkif_max_ring_order > XENBUS_MAX_RING_PAGE_ORDER) {
pr_info("Invalid max_ring_order (%d), will use default max: %d.\n",
xen_blkif_max_ring_order, XENBUS_MAX_RING_PAGE_ORDER);
xen_blkif_max_ring_order = XENBUS_MAX_RING_PAGE_ORDER;
}
rc = xen_blkif_interface_init();
if (rc)
goto failed_init;

4
drivers/block/xen-blkback/common.h
View File

@ -44,6 +44,7 @@
#include <xen/interface/io/blkif.h>
#include <xen/interface/io/protocols.h>
extern unsigned int xen_blkif_max_ring_order;
/*
* This is the maximum number of segments that would be allowed in indirect
* requests. This value will also be passed to the frontend.
@ -248,7 +249,7 @@ struct backend_info;
#define PERSISTENT_GNT_WAS_ACTIVE 1
/* Number of requests that we can fit in a ring */
#define XEN_BLKIF_REQS 32
#define XEN_BLKIF_REQS_PER_PAGE 32
struct persistent_gnt {
struct page *page;
@ -320,6 +321,7 @@ struct xen_blkif {
struct work_struct free_work;
/* Thread shutdown wait queue. */
wait_queue_head_t shutdown_wq;
unsigned int nr_ring_pages;
};
struct seg_buf {

167
drivers/block/xen-blkback/xenbus.c
View File

@ -25,6 +25,7 @@
/* Enlarge the array size in order to fully show blkback name. */
#define BLKBACK_NAME_LEN (20)
#define RINGREF_NAME_LEN (20)
struct backend_info {
struct xenbus_device *dev;
@ -124,8 +125,6 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
static struct xen_blkif *xen_blkif_alloc(domid_t domid)
{
struct xen_blkif *blkif;
struct pending_req *req, *n;
int i, j;
BUILD_BUG_ON(MAX_INDIRECT_PAGES > BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST);
@ -151,55 +150,15 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
INIT_LIST_HEAD(&blkif->pending_free);
INIT_WORK(&blkif->free_work, xen_blkif_deferred_free);
for (i = 0; i < XEN_BLKIF_REQS; i++) {
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
goto fail;
list_add_tail(&req->free_list,
&blkif->pending_free);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
req->segments[j] = kzalloc(sizeof(*req->segments[0]),
GFP_KERNEL);
if (!req->segments[j])
goto fail;
}
for (j = 0; j < MAX_INDIRECT_PAGES; j++) {
req->indirect_pages[j] = kzalloc(sizeof(*req->indirect_pages[0]),
GFP_KERNEL);
if (!req->indirect_pages[j])
goto fail;
}
}
spin_lock_init(&blkif->pending_free_lock);
init_waitqueue_head(&blkif->pending_free_wq);
init_waitqueue_head(&blkif->shutdown_wq);
return blkif;
fail:
list_for_each_entry_safe(req, n, &blkif->pending_free, free_list) {
list_del(&req->free_list);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
if (!req->segments[j])
break;
kfree(req->segments[j]);
}
for (j = 0; j < MAX_INDIRECT_PAGES; j++) {
if (!req->indirect_pages[j])
break;
kfree(req->indirect_pages[j]);
}
kfree(req);
}
kmem_cache_free(xen_blkif_cachep, blkif);
return ERR_PTR(-ENOMEM);
}
static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t gref,
unsigned int evtchn)
static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t *gref,
unsigned int nr_grefs, unsigned int evtchn)
{
int err;
@ -207,7 +166,7 @@ static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t gref,
if (blkif->irq)
return 0;
err = xenbus_map_ring_valloc(blkif->be->dev, &gref, 1,
err = xenbus_map_ring_valloc(blkif->be->dev, gref, nr_grefs,
&blkif->blk_ring);
if (err < 0)
return err;
@ -217,21 +176,21 @@ static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t gref,
{
struct blkif_sring *sring;
sring = (struct blkif_sring *)blkif->blk_ring;
BACK_RING_INIT(&blkif->blk_rings.native, sring, PAGE_SIZE);
BACK_RING_INIT(&blkif->blk_rings.native, sring, PAGE_SIZE * nr_grefs);
break;
}
case BLKIF_PROTOCOL_X86_32:
{
struct blkif_x86_32_sring *sring_x86_32;
sring_x86_32 = (struct blkif_x86_32_sring *)blkif->blk_ring;
BACK_RING_INIT(&blkif->blk_rings.x86_32, sring_x86_32, PAGE_SIZE);
BACK_RING_INIT(&blkif->blk_rings.x86_32, sring_x86_32, PAGE_SIZE * nr_grefs);
break;
}
case BLKIF_PROTOCOL_X86_64:
{
struct blkif_x86_64_sring *sring_x86_64;
sring_x86_64 = (struct blkif_x86_64_sring *)blkif->blk_ring;
BACK_RING_INIT(&blkif->blk_rings.x86_64, sring_x86_64, PAGE_SIZE);
BACK_RING_INIT(&blkif->blk_rings.x86_64, sring_x86_64, PAGE_SIZE * nr_grefs);
break;
}
default:
@ -312,7 +271,7 @@ static void xen_blkif_free(struct xen_blkif *blkif)
i++;
}
WARN_ON(i != XEN_BLKIF_REQS);
WARN_ON(i != (XEN_BLKIF_REQS_PER_PAGE * blkif->nr_ring_pages));
kmem_cache_free(xen_blkif_cachep, blkif);
}
@ -597,6 +556,11 @@ static int xen_blkbk_probe(struct xenbus_device *dev,
if (err)
goto fail;
err = xenbus_printf(XBT_NIL, dev->nodename, "max-ring-page-order", "%u",
xen_blkif_max_ring_order);
if (err)
pr_warn("%s write out 'max-ring-page-order' failed\n", __func__);
err = xenbus_switch_state(dev, XenbusStateInitWait);
if (err)
goto fail;
@ -860,22 +824,66 @@ again:
static int connect_ring(struct backend_info *be)
{
struct xenbus_device *dev = be->dev;
unsigned long ring_ref;
unsigned int evtchn;
unsigned int ring_ref[XENBUS_MAX_RING_PAGES];
unsigned int evtchn, nr_grefs, ring_page_order;
unsigned int pers_grants;
char protocol[64] = "";
int err;
struct pending_req *req, *n;
int err, i, j;
pr_debug("%s %s\n", __func__, dev->otherend);
err = xenbus_gather(XBT_NIL, dev->otherend, "ring-ref", "%lu",
&ring_ref, "event-channel", "%u", &evtchn, NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/ring-ref and event-channel",
err = xenbus_scanf(XBT_NIL, dev->otherend, "event-channel", "%u",
&evtchn);
if (err != 1) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "reading %s/event-channel",
dev->otherend);
return err;
}
pr_info("event-channel %u\n", evtchn);
err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-page-order", "%u",
&ring_page_order);
if (err != 1) {
err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-ref",
"%u", &ring_ref[0]);
if (err != 1) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "reading %s/ring-ref",
dev->otherend);
return err;
}
nr_grefs = 1;
pr_info("%s:using single page: ring-ref %d\n", dev->otherend,
ring_ref[0]);
} else {
unsigned int i;
if (ring_page_order > xen_blkif_max_ring_order) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "%s/request %d ring page order exceed max:%d",
dev->otherend, ring_page_order,
xen_blkif_max_ring_order);
return err;
}
nr_grefs = 1 << ring_page_order;
for (i = 0; i < nr_grefs; i++) {
char ring_ref_name[RINGREF_NAME_LEN];
snprintf(ring_ref_name, RINGREF_NAME_LEN, "ring-ref%u", i);
err = xenbus_scanf(XBT_NIL, dev->otherend, ring_ref_name,
"%u", &ring_ref[i]);
if (err != 1) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "reading %s/%s",
dev->otherend, ring_ref_name);
return err;
}
pr_info("ring-ref%u: %u\n", i, ring_ref[i]);
}
}
be->blkif->blk_protocol = BLKIF_PROTOCOL_DEFAULT;
err = xenbus_gather(XBT_NIL, dev->otherend, "protocol",
@ -900,20 +908,55 @@ static int connect_ring(struct backend_info *be)
be->blkif->vbd.feature_gnt_persistent = pers_grants;
be->blkif->vbd.overflow_max_grants = 0;
be->blkif->nr_ring_pages = nr_grefs;
pr_info("ring-ref %ld, event-channel %d, protocol %d (%s) %s\n",
ring_ref, evtchn, be->blkif->blk_protocol, protocol,
pr_info("ring-pages:%d, event-channel %d, protocol %d (%s) %s\n",
nr_grefs, evtchn, be->blkif->blk_protocol, protocol,
pers_grants ? "persistent grants" : "");
for (i = 0; i < nr_grefs * XEN_BLKIF_REQS_PER_PAGE; i++) {
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
goto fail;
list_add_tail(&req->free_list, &be->blkif->pending_free);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
req->segments[j] = kzalloc(sizeof(*req->segments[0]), GFP_KERNEL);
if (!req->segments[j])
goto fail;
}
for (j = 0; j < MAX_INDIRECT_PAGES; j++) {
req->indirect_pages[j] = kzalloc(sizeof(*req->indirect_pages[0]),
GFP_KERNEL);
if (!req->indirect_pages[j])
goto fail;
}
}
/* Map the shared frame, irq etc. */
err = xen_blkif_map(be->blkif, ring_ref, evtchn);
err = xen_blkif_map(be->blkif, ring_ref, nr_grefs, evtchn);
if (err) {
xenbus_dev_fatal(dev, err, "mapping ring-ref %lu port %u",
ring_ref, evtchn);
xenbus_dev_fatal(dev, err, "mapping ring-ref port %u", evtchn);
return err;
}
return 0;
fail:
list_for_each_entry_safe(req, n, &be->blkif->pending_free, free_list) {
list_del(&req->free_list);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
if (!req->segments[j])
break;
kfree(req->segments[j]);
}
for (j = 0; j < MAX_INDIRECT_PAGES; j++) {
if (!req->indirect_pages[j])
break;
kfree(req->indirect_pages[j]);
}
kfree(req);
}
return -ENOMEM;
}
static const struct xenbus_device_id xen_blkbk_ids[] = {

151
drivers/block/xen-blkfront.c
View File

@ -98,7 +98,21 @@ static unsigned int xen_blkif_max_segments = 32;
module_param_named(max, xen_blkif_max_segments, int, S_IRUGO);
MODULE_PARM_DESC(max, "Maximum amount of segments in indirect requests (default is 32)");
#define BLK_RING_SIZE __CONST_RING_SIZE(blkif, PAGE_SIZE)
/*
* Maximum order of pages to be used for the shared ring between front and
* backend, 4KB page granularity is used.
*/
static unsigned int xen_blkif_max_ring_order;
module_param_named(max_ring_page_order, xen_blkif_max_ring_order, int, S_IRUGO);
MODULE_PARM_DESC(max_ring_page_order, "Maximum order of pages to be used for the shared ring");
#define BLK_RING_SIZE(info) __CONST_RING_SIZE(blkif, PAGE_SIZE * (info)->nr_ring_pages)
#define BLK_MAX_RING_SIZE __CONST_RING_SIZE(blkif, PAGE_SIZE * XENBUS_MAX_RING_PAGES)
/*
* ring-ref%i i=(-1UL) would take 11 characters + 'ring-ref' is 8, so 19
* characters are enough. Define to 20 to keep consist with backend.
*/
#define RINGREF_NAME_LEN (20)
/*
* We have one of these per vbd, whether ide, scsi or 'other'. They
@ -114,13 +128,14 @@ struct blkfront_info
int vdevice;
blkif_vdev_t handle;
enum blkif_state connected;
int ring_ref;
int ring_ref[XENBUS_MAX_RING_PAGES];
unsigned int nr_ring_pages;
struct blkif_front_ring ring;
unsigned int evtchn, irq;
struct request_queue *rq;
struct work_struct work;
struct gnttab_free_callback callback;
struct blk_shadow shadow[BLK_RING_SIZE];
struct blk_shadow shadow[BLK_MAX_RING_SIZE];
struct list_head grants;
struct list_head indirect_pages;
unsigned int persistent_gnts_c;
@ -139,8 +154,6 @@ static unsigned int nr_minors;
static unsigned long *minors;
static DEFINE_SPINLOCK(minor_lock);
#define MAXIMUM_OUTSTANDING_BLOCK_REQS \
(BLKIF_MAX_SEGMENTS_PER_REQUEST * BLK_RING_SIZE)
#define GRANT_INVALID_REF 0
#define PARTS_PER_DISK 16
@ -170,7 +183,7 @@ static int blkfront_setup_indirect(struct blkfront_info *info);
static int get_id_from_freelist(struct blkfront_info *info)
{
unsigned long free = info->shadow_free;
BUG_ON(free >= BLK_RING_SIZE);
BUG_ON(free >= BLK_RING_SIZE(info));
info->shadow_free = info->shadow[free].req.u.rw.id;
info->shadow[free].req.u.rw.id = 0x0fffffee; /* debug */
return free;
@ -983,7 +996,7 @@ static void blkif_free(struct blkfront_info *info, int suspend)
}
}
for (i = 0; i < BLK_RING_SIZE; i++) {
for (i = 0; i < BLK_RING_SIZE(info); i++) {
/*
* Clear persistent grants present in requests already
* on the shared ring
@ -1033,12 +1046,15 @@ free_shadow:
flush_work(&info->work);
/* Free resources associated with old device channel. */
if (info->ring_ref != GRANT_INVALID_REF) {
gnttab_end_foreign_access(info->ring_ref, 0,
(unsigned long)info->ring.sring);
info->ring_ref = GRANT_INVALID_REF;
info->ring.sring = NULL;
for (i = 0; i < info->nr_ring_pages; i++) {
if (info->ring_ref[i] != GRANT_INVALID_REF) {
gnttab_end_foreign_access(info->ring_ref[i], 0, 0);
info->ring_ref[i] = GRANT_INVALID_REF;
}
}
free_pages((unsigned long)info->ring.sring, get_order(info->nr_ring_pages * PAGE_SIZE));
info->ring.sring = NULL;
if (info->irq)
unbind_from_irqhandler(info->irq, info);
info->evtchn = info->irq = 0;
@ -1157,7 +1173,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
* never have given to it (we stamp it up to BLK_RING_SIZE -
* look in get_id_from_freelist.
*/
if (id >= BLK_RING_SIZE) {
if (id >= BLK_RING_SIZE(info)) {
WARN(1, "%s: response to %s has incorrect id (%ld)\n",
info->gd->disk_name, op_name(bret->operation), id);
/* We can't safely get the 'struct request' as
@ -1245,26 +1261,30 @@ static int setup_blkring(struct xenbus_device *dev,
struct blkfront_info *info)
{
struct blkif_sring *sring;
grant_ref_t gref;
int err;
int err, i;
unsigned long ring_size = info->nr_ring_pages * PAGE_SIZE;
grant_ref_t gref[XENBUS_MAX_RING_PAGES];
info->ring_ref = GRANT_INVALID_REF;
for (i = 0; i < info->nr_ring_pages; i++)
info->ring_ref[i] = GRANT_INVALID_REF;
sring = (struct blkif_sring *)__get_free_page(GFP_NOIO | __GFP_HIGH);
sring = (struct blkif_sring *)__get_free_pages(GFP_NOIO | __GFP_HIGH,
get_order(ring_size));
if (!sring) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating shared ring");
return -ENOMEM;
}
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
FRONT_RING_INIT(&info->ring, sring, ring_size);
err = xenbus_grant_ring(dev, info->ring.sring, 1, &gref);
err = xenbus_grant_ring(dev, info->ring.sring, info->nr_ring_pages, gref);
if (err < 0) {
free_page((unsigned long)sring);
free_pages((unsigned long)sring, get_order(ring_size));
info->ring.sring = NULL;
goto fail;
}
info->ring_ref = gref;
for (i = 0; i < info->nr_ring_pages; i++)
info->ring_ref[i] = gref[i];
err = xenbus_alloc_evtchn(dev, &info->evtchn);
if (err)
@ -1292,7 +1312,18 @@ static int talk_to_blkback(struct xenbus_device *dev,
{
const char *message = NULL;
struct xenbus_transaction xbt;
int err;
int err, i;
unsigned int max_page_order = 0;
unsigned int ring_page_order = 0;
err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
"max-ring-page-order", "%u", &max_page_order);
if (err != 1)
info->nr_ring_pages = 1;
else {
ring_page_order = min(xen_blkif_max_ring_order, max_page_order);
info->nr_ring_pages = 1 << ring_page_order;
}
/* Create shared ring, alloc event channel. */
err = setup_blkring(dev, info);
@ -1306,11 +1337,32 @@ again:
goto destroy_blkring;
}
err = xenbus_printf(xbt, dev->nodename,
"ring-ref", "%u", info->ring_ref);
if (err) {
message = "writing ring-ref";
goto abort_transaction;
if (info->nr_ring_pages == 1) {
err = xenbus_printf(xbt, dev->nodename,
"ring-ref", "%u", info->ring_ref[0]);
if (err) {
message = "writing ring-ref";
goto abort_transaction;
}
} else {
err = xenbus_printf(xbt, dev->nodename,
"ring-page-order", "%u", ring_page_order);
if (err) {
message = "writing ring-page-order";
goto abort_transaction;
}
for (i = 0; i < info->nr_ring_pages; i++) {
char ring_ref_name[RINGREF_NAME_LEN];
snprintf(ring_ref_name, RINGREF_NAME_LEN, "ring-ref%u", i);
err = xenbus_printf(xbt, dev->nodename, ring_ref_name,
"%u", info->ring_ref[i]);
if (err) {
message = "writing ring-ref";
goto abort_transaction;
}
}
}
err = xenbus_printf(xbt, dev->nodename,
"event-channel", "%u", info->evtchn);
@ -1338,6 +1390,9 @@ again:
goto destroy_blkring;
}
for (i = 0; i < BLK_RING_SIZE(info); i++)
info->shadow[i].req.u.rw.id = i+1;
info->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
xenbus_switch_state(dev, XenbusStateInitialised);
return 0;
@ -1361,7 +1416,7 @@ again:
static int blkfront_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int err, vdevice, i;
int err, vdevice;
struct blkfront_info *info;
/* FIXME: Use dynamic device id if this is not set. */
@ -1422,21 +1477,10 @@ static int blkfront_probe(struct xenbus_device *dev,
info->connected = BLKIF_STATE_DISCONNECTED;
INIT_WORK(&info->work, blkif_restart_queue);
for (i = 0; i < BLK_RING_SIZE; i++)
info->shadow[i].req.u.rw.id = i+1;
info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
/* Front end dir is a number, which is used as the id. */
info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
dev_set_drvdata(&dev->dev, info);
err = talk_to_blkback(dev, info);
if (err) {
kfree(info);
dev_set_drvdata(&dev->dev, NULL);
return err;
}
return 0;
}
@ -1476,10 +1520,10 @@ static int blkif_recover(struct blkfront_info *info)
/* Stage 2: Set up free list. */
memset(&info->shadow, 0, sizeof(info->shadow));
for (i = 0; i < BLK_RING_SIZE; i++)
for (i = 0; i < BLK_RING_SIZE(info); i++)
info->shadow[i].req.u.rw.id = i+1;
info->shadow_free = info->ring.req_prod_pvt;
info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
info->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
rc = blkfront_setup_indirect(info);
if (rc) {
@ -1491,7 +1535,7 @@ static int blkif_recover(struct blkfront_info *info)
blk_queue_max_segments(info->rq, segs);
bio_list_init(&bio_list);
INIT_LIST_HEAD(&requests);
for (i = 0; i < BLK_RING_SIZE; i++) {
for (i = 0; i < BLK_RING_SIZE(info); i++) {
/* Not in use? */
if (!copy[i].request)
continue;
@ -1697,7 +1741,7 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
segs = info->max_indirect_segments;
}
err = fill_grant_buffer(info, (segs + INDIRECT_GREFS(segs)) * BLK_RING_SIZE);
err = fill_grant_buffer(info, (segs + INDIRECT_GREFS(segs)) * BLK_RING_SIZE(info));
if (err)
goto out_of_memory;
@ -1707,7 +1751,7 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
* grants, we need to allocate a set of pages that can be
* used for mapping indirect grefs
*/
int num = INDIRECT_GREFS(segs) * BLK_RING_SIZE;
int num = INDIRECT_GREFS(segs) * BLK_RING_SIZE(info);
BUG_ON(!list_empty(&info->indirect_pages));
for (i = 0; i < num; i++) {
@ -1718,7 +1762,7 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
}
}
for (i = 0; i < BLK_RING_SIZE; i++) {
for (i = 0; i < BLK_RING_SIZE(info); i++) {
info->shadow[i].grants_used = kzalloc(
sizeof(info->shadow[i].grants_used[0]) * segs,
GFP_NOIO);
@ -1740,7 +1784,7 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
return 0;
out_of_memory:
for (i = 0; i < BLK_RING_SIZE; i++) {
for (i = 0; i < BLK_RING_SIZE(info); i++) {
kfree(info->shadow[i].grants_used);
info->shadow[i].grants_used = NULL;
kfree(info->shadow[i].sg);
@ -1906,8 +1950,15 @@ static void blkback_changed(struct xenbus_device *dev,
dev_dbg(&dev->dev, "blkfront:blkback_changed to state %d.\n", backend_state);
switch (backend_state) {
case XenbusStateInitialising:
case XenbusStateInitWait:
if (dev->state != XenbusStateInitialising)
break;
if (talk_to_blkback(dev, info)) {
kfree(info);
dev_set_drvdata(&dev->dev, NULL);
break;
}
case XenbusStateInitialising:
case XenbusStateInitialised:
case XenbusStateReconfiguring:
case XenbusStateReconfigured:
@ -2091,6 +2142,12 @@ static int __init xlblk_init(void)
if (!xen_domain())
return -ENODEV;
if (xen_blkif_max_ring_order > XENBUS_MAX_RING_PAGE_ORDER) {
pr_info("Invalid max_ring_order (%d), will use default max: %d.\n",
xen_blkif_max_ring_order, XENBUS_MAX_RING_PAGE_ORDER);
xen_blkif_max_ring_order = 0;
}
if (!xen_has_pv_disk_devices())
return -ENODEV;