linux-kernel - [PATCH v2 43/53] afs: Make afs_write

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Message-ID: <163492972548.1038219.2862380188907793320.stgit@warthog.procyon.org.uk>
Date:   Fri, 22 Oct 2021 20:08:45 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.com
Cc:     Marc Dionne <marc.dionne@...istor.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-afs@...ts.infradead.org, dhowells@...hat.com,
        Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jeff Layton <jlayton@...nel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Omar Sandoval <osandov@...ndov.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 43/53] afs: Make afs_write_begin() return the THP subpage

generic_perform_write() can't handle a THP, so we have to return the
subpage of that THP from afs_write_begin() and then convert it back into
the head on entry to afs_write_end().

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: Matthew Wilcox <willy@...radead.org>
cc: linux-afs@...ts.infradead.org
---

 fs/afs/write.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/afs/write.c b/fs/afs/write.c
index 19be3153d610..a01b1687a146 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -78,7 +78,7 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
 			goto flush_conflicting_write;
 	}
 
-	*_page = page;
+	*_page = find_subpage(page, pos / PAGE_SIZE);
 	_leave(" = 0");
 	return 0;
 
@@ -108,9 +108,10 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
  */
 int afs_write_end(struct file *file, struct address_space *mapping,
 		  loff_t pos, unsigned len, unsigned copied,
-		  struct page *page, void *fsdata)
+		  struct page *subpage, void *fsdata)
 {
 	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
+	struct page *page = thp_head(subpage);
 	unsigned long priv;
 	unsigned int f, from = offset_in_thp(page, pos);
 	unsigned int t, to = from + copied;