From fa04a40b169fcee615afbae97f71a09332993f64 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 21 Oct 2020 13:22:19 +0100 Subject: afs: Fix to take ref on page when PG_private is set Fix afs to take a ref on a page when it sets PG_private on it and to drop the ref when removing the flag. Note that in afs_write_begin(), a lot of the time, PG_private is already set on a page to which we're going to add some data. In such a case, we leave the bit set and mustn't increment the page count. As suggested by Matthew Wilcox, use attach/detach_page_private() where possible. Fixes: 31143d5d515e ("AFS: implement basic file write support") Reported-by: Matthew Wilcox (Oracle) Signed-off-by: David Howells Reviewed-by: Matthew Wilcox (Oracle) --- fs/afs/dir_edit.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'fs/afs/dir_edit.c') diff --git a/fs/afs/dir_edit.c b/fs/afs/dir_edit.c index b108528bf010..2ffe09abae7f 100644 --- a/fs/afs/dir_edit.c +++ b/fs/afs/dir_edit.c @@ -243,10 +243,8 @@ void afs_edit_dir_add(struct afs_vnode *vnode, index, gfp); if (!page) goto error; - if (!PagePrivate(page)) { - set_page_private(page, 1); - SetPagePrivate(page); - } + if (!PagePrivate(page)) + attach_page_private(page, (void *)1); dir_page = kmap(page); } -- cgit v1.2.3