afs: Pass page into dirty region helpers to provide THP size

Pass a pointer to the page being accessed into the dirty region helpers so
that the size of the page can be determined in case it's a transparent huge
page.

This also required the page to be passed into the afs_page_dirty trace
point - so there's no need to specifically pass in the index or private
data as these can be retrieved directly from the page struct.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-By: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/160588527183.3465195.16107942526481976308.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161118144921.1232039.11377711180492625929.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161161040747.2537118.11435394902674511430.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/161340404553.1303470.11414163641767769882.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/161539548385.286939.8864598314493255313.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/161653804285.2770958.3497360004849598038.stgit@warthog.procyon.org.uk/ # v5
Link: https://lore.kernel.org/r/161789087043.6155.16922142208140170528.stgit@warthog.procyon.org.uk/ # v6

1 files changed, 25 insertions, 35 deletions

diff --git a/fs/afs/write.c b/fs/afs/write.c
index 901bd2ee2dd0..babc84dd9719 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -112,15 +112,14 @@ try_again:
 	t = f = 0;
 	if (PagePrivate(page)) {
 		priv = page_private(page);
-		f = afs_page_dirty_from(priv);
-		t = afs_page_dirty_to(priv);
+		f = afs_page_dirty_from(page, priv);
+		t = afs_page_dirty_to(page, priv);
 		ASSERTCMP(f, <=, t);
 	}
 
 	if (f != t) {
 		if (PageWriteback(page)) {
-			trace_afs_page_dirty(vnode, tracepoint_string("alrdy"),
-					     page->index, priv);
+			trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), page);
 			goto flush_conflicting_write;
 		}
 		/* If the file is being filled locally, allow inter-write
@@ -204,21 +203,19 @@ int afs_write_end(struct file *file, struct address_space *mapping,
 
 	if (PagePrivate(page)) {
 		priv = page_private(page);
-		f = afs_page_dirty_from(priv);
-		t = afs_page_dirty_to(priv);
+		f = afs_page_dirty_from(page, priv);
+		t = afs_page_dirty_to(page, priv);
 		if (from < f)
 			f = from;
 		if (to > t)
 			t = to;
-		priv = afs_page_dirty(f, t);
+		priv = afs_page_dirty(page, f, t);
 		set_page_private(page, priv);
-		trace_afs_page_dirty(vnode, tracepoint_string("dirty+"),
-				     page->index, priv);
+		trace_afs_page_dirty(vnode, tracepoint_string("dirty+"), page);
 	} else {
-		priv = afs_page_dirty(from, to);
+		priv = afs_page_dirty(page, from, to);
 		attach_page_private(page, (void *)priv);
-		trace_afs_page_dirty(vnode, tracepoint_string("dirty"),
-				     page->index, priv);
+		trace_afs_page_dirty(vnode, tracepoint_string("dirty"), page);
 	}
 
 	set_page_dirty(page);
@@ -321,7 +318,6 @@ static void afs_pages_written_back(struct afs_vnode *vnode,
 				   pgoff_t first, pgoff_t last)
 {
 	struct pagevec pv;
-	unsigned long priv;
 	unsigned count, loop;
 
 	_enter("{%llx:%llu},{%lx-%lx}",
@@ -340,9 +336,9 @@ static void afs_pages_written_back(struct afs_vnode *vnode,
 		ASSERTCMP(pv.nr, ==, count);
 
 		for (loop = 0; loop < count; loop++) {
-			priv = (unsigned long)detach_page_private(pv.pages[loop]);
+			detach_page_private(pv.pages[loop]);
 			trace_afs_page_dirty(vnode, tracepoint_string("clear"),
-					     pv.pages[loop]->index, priv);
+					     pv.pages[loop]);
 			end_page_writeback(pv.pages[loop]);
 		}
 		first += count;
@@ -516,15 +512,13 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
 	 */
 	start = primary_page->index;
 	priv = page_private(primary_page);
-	offset = afs_page_dirty_from(priv);
-	to = afs_page_dirty_to(priv);
-	trace_afs_page_dirty(vnode, tracepoint_string("store"),
-			     primary_page->index, priv);
+	offset = afs_page_dirty_from(primary_page, priv);
+	to = afs_page_dirty_to(primary_page, priv);
+	trace_afs_page_dirty(vnode, tracepoint_string("store"), primary_page);
 
 	WARN_ON(offset == to);
 	if (offset == to)
-		trace_afs_page_dirty(vnode, tracepoint_string("WARN"),
-				     primary_page->index, priv);
+		trace_afs_page_dirty(vnode, tracepoint_string("WARN"), primary_page);
 
 	if (start >= final_page ||
 	    (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)))
@@ -562,8 +556,8 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
 			}
 
 			priv = page_private(page);
-			f = afs_page_dirty_from(priv);
-			t = afs_page_dirty_to(priv);
+			f = afs_page_dirty_from(page, priv);
+			t = afs_page_dirty_to(page, priv);
 			if (f != 0 &&
 			    !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) {
 				unlock_page(page);
@@ -571,8 +565,7 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
 			}
 			to = t;
 
-			trace_afs_page_dirty(vnode, tracepoint_string("store+"),
-					     page->index, priv);
+			trace_afs_page_dirty(vnode, tracepoint_string("store+"), page);
 
 			if (!clear_page_dirty_for_io(page))
 				BUG();
@@ -860,14 +853,13 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
 	 */
 	wait_on_page_writeback(vmf->page);
 
-	priv = afs_page_dirty(0, PAGE_SIZE);
+	priv = afs_page_dirty(vmf->page, 0, PAGE_SIZE);
 	priv = afs_page_dirty_mmapped(priv);
-	trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"),
-			     vmf->page->index, priv);
 	if (PagePrivate(vmf->page))
 		set_page_private(vmf->page, priv);
 	else
 		attach_page_private(vmf->page, (void *)priv);
+	trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), vmf->page);
 	file_update_time(file);
 
 	sb_end_pagefault(inode->i_sb);
@@ -920,17 +912,15 @@ int afs_launder_page(struct page *page)
 		f = 0;
 		t = PAGE_SIZE;
 		if (PagePrivate(page)) {
-			f = afs_page_dirty_from(priv);
-			t = afs_page_dirty_to(priv);
+			f = afs_page_dirty_from(page, priv);
+			t = afs_page_dirty_to(page, priv);
 		}
 
-		trace_afs_page_dirty(vnode, tracepoint_string("launder"),
-				     page->index, priv);
+		trace_afs_page_dirty(vnode, tracepoint_string("launder"), page);
 		ret = afs_store_data(mapping, page->index, page->index, t, f, true);
 	}
 
-	priv = (unsigned long)detach_page_private(page);
-	trace_afs_page_dirty(vnode, tracepoint_string("laundered"),
-			     page->index, priv);
+	detach_page_private(page);
+	trace_afs_page_dirty(vnode, tracepoint_string("laundered"), page);
 	return ret;
 }