[PATCH] fuse: don't update file times

Don't change mtime/ctime/atime to local time on read/write.  Rather invalidate
file attributes, so next stat() will force a GETATTR call.  Bug reported by
Ben Grimm.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/fuse/dir.c

@@ -552,6 +552,7 @@ static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
 				    filldir);
 
 	__free_page(page);
+	fuse_invalidate_attr(inode); /* atime changed */
 	return err;
 }
 
@@ -585,6 +586,7 @@ static char *read_link(struct dentry *dentry)
 		link[req->out.args[0].size] = '\0';
  out:
 	fuse_put_request(fc, req);
+	fuse_invalidate_attr(inode); /* atime changed */
 	return link;
 }
 

fs/fuse/file.c

@@ -244,6 +244,7 @@ static int fuse_readpage(struct file *file, struct page *page)
 	fuse_put_request(fc, req);
 	if (!err)
 		SetPageUptodate(page);
+	fuse_invalidate_attr(inode); /* atime changed */
  out:
 	unlock_page(page);
 	return err;
@@ -312,6 +313,7 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
 	if (!err && data.req->num_pages)
 		err = fuse_send_readpages(data.req, file, inode);
 	fuse_put_request(fc, data.req);
+	fuse_invalidate_attr(inode); /* atime changed */
 	return err;
 }
 
@@ -380,8 +382,8 @@ static int fuse_commit_write(struct file *file, struct page *page,
 			clear_page_dirty(page);
 			SetPageUptodate(page);
 		}
-	} else if (err == -EINTR || err == -EIO)
-		fuse_invalidate_attr(inode);
+	}
+	fuse_invalidate_attr(inode);
 	return err;
 }
 
@@ -473,8 +475,8 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
 		if (write && pos > i_size_read(inode))
 			i_size_write(inode, pos);
 		*ppos = pos;
-	} else if (write && (res == -EINTR || res == -EIO))
-		fuse_invalidate_attr(inode);
+	}
+	fuse_invalidate_attr(inode);
 
 	return res;
 }

fs/fuse/inode.c

@@ -173,6 +173,7 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
 		return NULL;
 
 	if ((inode->i_state & I_NEW)) {
+		inode->i_flags |= S_NOATIME|S_NOCMTIME;
 		inode->i_generation = generation;
 		inode->i_data.backing_dev_info = &fc->bdi;
 		fuse_init_inode(inode, attr);