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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-06-18 12:54:00 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-18 14:46:10 +0200
commitd3a9262e59f7fb83c6d44df3b2b1460ed57d3ea1 (patch)
tree563952174f1ffec3d6d27fc3c38d4dc009b6787d /fs
parente24a72c4d8f0b2c17783b3ba9c8931b537149423 (diff)
downloadlinux-d3a9262e59f7fb83c6d44df3b2b1460ed57d3ea1.tar.gz
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 <a.p.zijlstra@chello.nl> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davide Libenzi <davidel@xmailserver.org> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs')
-rw-r--r--fs/anon_inodes.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 1dd96d4406c..47d4a01c539 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