MODULE_PARM_DESC(reqs, "Number of blkback requests to allocate");
/* Run-time switchable: /sys/module/blkback/parameters/ */
-static unsigned int log_stats = 0;
-static unsigned int debug_lvl = 0;
+static unsigned int log_stats;
+static unsigned int debug_lvl;
module_param(log_stats, int, 0644);
module_param(debug_lvl, int, 0644);
* the pendcnt towards zero. When it hits zero, the specified domain has a
* response queued for it, with the saved 'id' passed back.
*/
-typedef struct {
+struct pending_req {
struct blkif_st *blkif;
u64 id;
int nr_pages;
unsigned short operation;
int status;
struct list_head free_list;
-} pending_req_t;
+};
#define BLKBACK_INVALID_HANDLE (~0)
struct xen_blkbk {
- pending_req_t *pending_reqs;
+ struct pending_req *pending_reqs;
/* List of all 'pending_req' available */
struct list_head pending_free;
/* And its spinlock. */
* pending_pages[..]. For each 'pending_req' we have have up to
* BLKIF_MAX_SEGMENTS_PER_REQUEST (11) pages. The seg would be from 0 through
* 10 and would index in the pending_pages[..]. */
-static inline int vaddr_pagenr(pending_req_t *req, int seg)
+static inline int vaddr_pagenr(struct pending_req *req, int seg)
{
- return (req - blkbk->pending_reqs) * BLKIF_MAX_SEGMENTS_PER_REQUEST + seg;
+ return (req - blkbk->pending_reqs) *
+ BLKIF_MAX_SEGMENTS_PER_REQUEST + seg;
}
#define pending_page(req, seg) pending_pages[vaddr_pagenr(req, seg)]
-static inline unsigned long vaddr(pending_req_t *req, int seg)
+static inline unsigned long vaddr(struct pending_req *req, int seg)
{
unsigned long pfn = page_to_pfn(blkbk->pending_page(req, seg));
return (unsigned long)pfn_to_kaddr(pfn);
static int do_block_io_op(struct blkif_st *blkif);
static void dispatch_rw_block_io(struct blkif_st *blkif,
struct blkif_request *req,
- pending_req_t *pending_req);
+ struct pending_req *pending_req);
static void make_response(struct blkif_st *blkif, u64 id,
unsigned short op, int st);
/*
* Retrieve from the 'pending_reqs' a free pending_req structure to be used.
*/
-static pending_req_t* alloc_req(void)
+static struct pending_req *alloc_req(void)
{
- pending_req_t *req = NULL;
+ struct pending_req *req = NULL;
unsigned long flags;
spin_lock_irqsave(&blkbk->pending_free_lock, flags);
if (!list_empty(&blkbk->pending_free)) {
- req = list_entry(blkbk->pending_free.next, pending_req_t, free_list);
+ req = list_entry(blkbk->pending_free.next, struct pending_req,
+ free_list);
list_del(&req->free_list);
}
spin_unlock_irqrestore(&blkbk->pending_free_lock, flags);
* Return the 'pending_req' structure back to the freepool. We also
* wake up the thread if it was waiting for a free page.
*/
-static void free_req(pending_req_t *req)
+static void free_req(struct pending_req *req)
{
unsigned long flags;
int was_empty;
* Unmap the grant references, and also remove the M2P over-rides
* used in the 'pending_req'.
*/
-static void fast_flush_area(pending_req_t *req)
+static void fast_flush_area(struct pending_req *req)
{
struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
unsigned int i, invcount = 0;
GNTTABOP_unmap_grant_ref, unmap, invcount);
BUG_ON(ret);
/* Note, we use invcount, so nr->pages, so we can't index
- * using vaddr(req, i). */
+ * using vaddr(req, i).
+ */
for (i = 0; i < invcount; i++) {
ret = m2p_remove_override(
virt_to_page(unmap[i].host_addr), false);
}
}
-/******************************************************************
+/*
* SCHEDULER FUNCTIONS
*/
blkif->waiting_reqs || kthread_should_stop());
wait_event_interruptible(
blkbk->pending_free_wq,
- !list_empty(&blkbk->pending_free) || kthread_should_stop());
+ !list_empty(&blkbk->pending_free) ||
+ kthread_should_stop());
blkif->waiting_reqs = 0;
smp_mb(); /* clear flag *before* checking for work */
* Completion callback on the bio's. Called as bh->b_end_io()
*/
-static void __end_block_io_op(pending_req_t *pending_req, int error)
+static void __end_block_io_op(struct pending_req *pending_req, int error)
{
/* An error fails the entire request. */
if ((pending_req->operation == BLKIF_OP_WRITE_BARRIER) &&
/* If all of the bio's have completed it is time to unmap
* the grant references associated with 'request' and provide
- * the proper response on the ring. */
+ * the proper response on the ring.
+ */
if (atomic_dec_and_test(&pending_req->pendcnt)) {
fast_flush_area(pending_req);
make_response(pending_req->blkif, pending_req->id,
{
union blkif_back_rings *blk_rings = &blkif->blk_rings;
struct blkif_request req;
- pending_req_t *pending_req;
+ struct pending_req *pending_req;
RING_IDX rc, rp;
int more_to_do = 0;
*/
static void dispatch_rw_block_io(struct blkif_st *blkif,
struct blkif_request *req,
- pending_req_t *pending_req)
+ struct pending_req *pending_req)
{
struct gnttab_map_grant_ref map[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct phys_req preq;
/* Fill out preq.nr_sects with proper amount of sectors, and setup
* assign map[..] with the PFN of the page in our domain with the
- * corresponding grant reference for each page.*/
+ * corresponding grant reference for each page.
+ */
for (i = 0; i < nseg; i++) {
uint32_t flags;
BUG_ON(ret);
/* Now swizzel the MFN in our domain with the MFN from the other domain
- * so that when we access vaddr(pending_req,i) it has the contents of the
- * page from the other domain. */
+ * so that when we access vaddr(pending_req,i) it has the contents of
+ * the page from the other domain.
+ */
for (i = 0; i < nseg; i++) {
if (unlikely(map[i].status != 0)) {
DPRINTK("invalid buffer -- could not remap it\n");
if (ret)
continue;
-
+
ret = m2p_add_override(PFN_DOWN(map[i].dev_bus_addr),
blkbk->pending_page(pending_req, i), false);
if (ret) {
printk(KERN_ALERT "Failed to install M2P override for"\
- " %lx (ret: %d)\n", (unsigned long)map[i].dev_bus_addr, ret);
+ " %lx (ret: %d)\n", (unsigned long)
+ map[i].dev_bus_addr, ret);
/* We could switch over to GNTTABOP_copy */
continue;
}
(req->u.rw.seg[i].first_sect << 9);
}
- /* If we have failed at this point, we need to undo the M2P override, set
- * gnttab_set_unmap_op on all of the grant references and perform the
- * hypercall to unmap the grants - that is all done in fast_flush_area. */
+ /* If we have failed at this point, we need to undo the M2P override,
+ * set gnttab_set_unmap_op on all of the grant references and perform
+ * the hypercall to unmap the grants - that is all done in
+ * fast_flush_area.
+ */
if (ret)
goto fail_flush;
plug_queue(blkif, preq.bdev);
/* We set it one so that the last submit_bio does not have to call
- * atomic_inc. */
+ * atomic_inc.
+ */
atomic_set(&pending_req->pendcnt, 1);
blkif_get(blkif);
atomic_inc(&pending_req->pendcnt);
submit_bio(operation, bio);
}
-
+
bio = bio_alloc(GFP_KERNEL, nseg-i);
if (unlikely(bio == NULL))
goto fail_put_bio;
if (!xen_pv_domain())
return -ENODEV;
- blkbk = (struct xen_blkbk *)kzalloc(sizeof(struct xen_blkbk), GFP_KERNEL);
+ blkbk = kzalloc(sizeof(struct xen_blkbk), GFP_KERNEL);
if (!blkbk) {
printk(KERN_ALERT "%s: out of memory!\n", __func__);
return -ENOMEM;
blkbk->pending_pages = kzalloc(sizeof(blkbk->pending_pages[0]) *
mmap_pages, GFP_KERNEL);
- if (!blkbk->pending_reqs || !blkbk->pending_grant_handles || !blkbk->pending_pages) {
+ if (!blkbk->pending_reqs || !blkbk->pending_grant_handles ||
+ !blkbk->pending_pages) {
rc = -ENOMEM;
goto out_of_memory;
}
init_waitqueue_head(&blkbk->pending_free_wq);
for (i = 0; i < blkif_reqs; i++)
- list_add_tail(&blkbk->pending_reqs[i].free_list, &blkbk->pending_free);
+ list_add_tail(&blkbk->pending_reqs[i].free_list,
+ &blkbk->pending_free);
rc = blkif_xenbus_init();
if (rc)
git.openpandora.org / pandora-kernel.git / commitdiff