From d3a9262e59f7fb83c6d44df3b2b1460ed57d3ea1 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 18 Jun 2009 12:54:00 +0200 Subject: [PATCH] fs: Provide empty .set_page_dirty() aop for anon inodes .set_page_dirty() is one of those a_ops that defaults to the buffer implementation when not set. Therefore provide a dummy function to make it do nothing. (Uncovered by perfcounters fd's which can now be writable-mmap-ed.) Signed-off-by: Peter Zijlstra Cc: Al Viro Cc: Davide Libenzi LKML-Reference: Signed-off-by: Ingo Molnar --- fs/anon_inodes.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c index 1dd96d4406c0..47d4a01c5393 100644 --- a/fs/anon_inodes.c +++ b/fs/anon_inodes.c @@ -52,6 +52,19 @@ static const struct dentry_operations anon_inodefs_dentry_operations = { .d_delete = anon_inodefs_delete_dentry, }; +/* + * nop .set_page_dirty method so that people can use .page_mkwrite on + * anon inodes. + */ +static int anon_set_page_dirty(struct page *page) +{ + return 0; +}; + +static const struct address_space_operations anon_aops = { + .set_page_dirty = anon_set_page_dirty, +}; + /** * anon_inode_getfd - creates a new file instance by hooking it up to an * anonymous inode, and a dentry that describe the "class" @@ -151,6 +164,8 @@ static struct inode *anon_inode_mkinode(void) inode->i_fop = &anon_inode_fops; + inode->i_mapping->a_ops = &anon_aops; + /* * Mark the inode dirty from the very beginning, * that way it will never be moved to the dirty -- 2.20.1