page-pipe/page-xfer: remove PP_COMPAT (compatible iovs)

Parasite transfers pages in the same iovec format now: drop compatible
format (yay!).

travis-ci: success for Rectify 32-bit compatible C/R on x86
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/include/page-pipe.h

@@ -116,15 +116,8 @@ struct page_pipe {
 
 #define PP_CHUNK_MODE	0x1	/* Restrict the maximum buffer size of pipes
 				   and dump memory for a few iterations */
-#define PP_COMPAT	0x2	/* Use compatible iovs (struct compat_iovec) */
 #define PP_OWN_IOVS	0x4	/* create_page_pipe allocated IOVs memory */
 
-/* XXX: move to arch-depended file, when non-x86 add support for compat mode */
-struct iovec_compat {
-	u32	iov_base;
-	u32	iov_len;
-};
-
 struct page_pipe *create_page_pipe(unsigned int nr_segs, struct iovec *iovs, unsigned flags);
 extern void destroy_page_pipe(struct page_pipe *p);
 extern int page_pipe_add_page(struct page_pipe *p, unsigned long addr);

criu/mem.c

@@ -305,8 +305,6 @@ static int __parasite_dump_pages_seized(struct pstree_item *item,
 		 * use, i.e. on non-lazy non-predump.
 		 */
 		cpp_flags |= PP_CHUNK_MODE;
-	if (!compel_mode_native(ctl))
-		cpp_flags |= PP_COMPAT;
 	pp = create_page_pipe(vma_area_list->priv_size,
 					    pargs_iovs(args), cpp_flags);
 	if (!pp)

criu/page-pipe.c

@@ -81,15 +81,10 @@ static int ppb_resize_pipe(struct page_pipe_buf *ppb, unsigned long new_size)
 	return 0;
 }
 
-static inline void iov_init_compat(struct iovec_compat *iov, unsigned long addr)
-{
-	iov->iov_base = (u32)addr;
-	iov->iov_len = PAGE_SIZE;
-}
-
 static int page_pipe_grow(struct page_pipe *pp)
 {
 	struct page_pipe_buf *ppb;
+	struct iovec *free_iov;
 
 	pr_debug("Will grow page pipe (iov off is %u)\n", pp->free_iov);
 
@@ -107,7 +102,8 @@ static int page_pipe_grow(struct page_pipe *pp)
 		return -1;
 
 out:
-	ppb_init(ppb, 0, 0, &pp->iovs[pp->free_iov]);
+	free_iov = &pp->iovs[pp->free_iov];
+	ppb_init(ppb, 0, 0, free_iov);
 
 	return 0;
 }
@@ -214,13 +210,7 @@ static inline int try_add_page_to(struct page_pipe *pp, struct page_pipe_buf *pp
 
 	pr_debug("Add iov to page pipe (%u iovs, %u/%u total)\n",
 			ppb->nr_segs, pp->free_iov, pp->nr_iovs);
-	if (pp->flags & PP_COMPAT) {
-		struct iovec_compat *iovs = (void *)ppb->iov;
-
-		iov_init_compat(&iovs[ppb->nr_segs++], addr);
-	} else {
 	iov_init(&ppb->iov[ppb->nr_segs++], addr);
-	}
 	pp->free_iov++;
 	BUG_ON(pp->free_iov > pp->nr_iovs);
 out:
@@ -268,13 +258,8 @@ int page_pipe_add_hole(struct page_pipe *pp, unsigned long addr)
 			iov_grow_page(&pp->holes[pp->free_hole - 1], addr))
 		goto out;
 
-	if (pp->flags & PP_COMPAT) {
-		struct iovec_compat *iovs = (void *)pp->holes;
-
-		iov_init_compat(&iovs[pp->free_hole++], addr);
-	} else {
 	iov_init(&pp->holes[pp->free_hole++], addr);
-	}
+
 out:
 	return 0;
 }
@@ -284,7 +269,6 @@ void debug_show_page_pipe(struct page_pipe *pp)
 	struct page_pipe_buf *ppb;
 	int i;
 	struct iovec *iov;
-	struct iovec_compat *iov_c;
 
 	if (pr_quelled(LOG_DEBUG))
 		return;
@@ -296,28 +280,15 @@ void debug_show_page_pipe(struct page_pipe *pp)
 		pr_debug("\tbuf %u pages, %u iovs:\n",
 				ppb->pages_in, ppb->nr_segs);
 		for (i = 0; i < ppb->nr_segs; i++) {
-			if (pp->flags & PP_COMPAT) {
-				iov_c = (void *)ppb->iov;
-				pr_debug("\t\t%x %lu\n", iov_c[i].iov_base,
-						(unsigned long) iov_c[i].iov_len / PAGE_SIZE);
-			} else {
 			iov = &ppb->iov[i];
 			pr_debug("\t\t%p %lu\n", iov->iov_base,
-						(unsigned long) iov->iov_len / PAGE_SIZE);
+					iov->iov_len / PAGE_SIZE);
-			}
 		}
 	}
 
 	pr_debug("* %u holes:\n", pp->free_hole);
 	for (i = 0; i < pp->free_hole; i++) {
-		if (pp->flags & PP_COMPAT) {
-			iov_c = (void *)pp->holes;
-			pr_debug("\t%x %lu\n", iov_c[i].iov_base,
-					(unsigned long) iov_c[i].iov_len / PAGE_SIZE);
-		} else {
 		iov = &pp->holes[i];
-			pr_debug("\t%p %lu\n", iov->iov_base,
+		pr_debug("\t%p %lu\n", iov->iov_base, iov->iov_len / PAGE_SIZE);
-					(unsigned long) iov->iov_len / PAGE_SIZE);
-		}
 	}
 }

criu/page-xfer.c

@@ -341,29 +341,13 @@ static int page_xfer_dump_hole(struct page_xfer *xfer,
 	return 0;
 }
 
-static struct iovec get_iov(struct iovec *iovs, unsigned int n, bool compat)
-{
-	if (likely(!compat)) {
-		return iovs[n];
-	} else {
-		struct iovec ret;
-		struct iovec_compat *tmp = (struct iovec_compat*)(void *)iovs;
-
-		tmp += n;
-		ret.iov_base = (void *)(uintptr_t)tmp->iov_base;
-		ret.iov_len = tmp->iov_len;
-		return ret;
-	}
-}
-
 static int dump_holes(struct page_xfer *xfer, struct page_pipe *pp,
 		      unsigned int *cur_hole, void *limit, unsigned long off)
 {
 	int ret;
 
 	for (; *cur_hole < pp->free_hole ; (*cur_hole)++) {
-		struct iovec hole = get_iov(pp->holes, *cur_hole,
+		struct iovec hole = pp->holes[*cur_hole];
-						pp->flags & PP_COMPAT);
 
 		if (limit && hole.iov_base >= limit)
 			break;
@@ -391,7 +375,7 @@ int page_xfer_dump_pages(struct page_xfer *xfer, struct page_pipe *pp,
 		pr_debug("\tbuf %d/%d\n", ppb->pages_in, ppb->nr_segs);
 
 		for (i = 0; i < ppb->nr_segs; i++) {
-			struct iovec iov = get_iov(ppb->iov, i, pp->flags & PP_COMPAT);
+			struct iovec iov = ppb->iov[i];
 
 			ret = dump_holes(xfer, pp, &cur_hole, iov.iov_base, off);
 			if (ret)