From 20955e891d828b2027281fe3295dae6af8e0423b Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@codeaurora.org>
Date: Thu, 5 Apr 2012 14:25:09 -0700
Subject: [PATCH] libfs: add simple_open()
debugfs and a few other drivers use an open-coded version of
simple_open() to pass a pointer from the file to the read/write file
ops. Add support for this simple case to libfs so that we can remove
the many duplicate copies of this simple function.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/libfs.c | 8 ++++++++
include/linux/fs.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/fs/libfs.c b/fs/libfs.c
index 4a0d1f06da57..358094f0433d 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -264,6 +264,13 @@ struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
return ERR_PTR(-ENOMEM);
}
+int simple_open(struct inode *inode, struct file *file)
+{
+ if (inode->i_private)
+ file->private_data = inode->i_private;
+ return 0;
+}
+
int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
@@ -984,6 +991,7 @@ EXPORT_SYMBOL(simple_dir_operations);
EXPORT_SYMBOL(simple_empty);
EXPORT_SYMBOL(simple_fill_super);
EXPORT_SYMBOL(simple_getattr);
+EXPORT_SYMBOL(simple_open);
EXPORT_SYMBOL(simple_link);
EXPORT_SYMBOL(simple_lookup);
EXPORT_SYMBOL(simple_pin_fs);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c437f914d537..c64c31d3ab2c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2502,6 +2502,7 @@ extern int dcache_readdir(struct file *, void *, filldir_t);
extern int simple_setattr(struct dentry *, struct iattr *);
extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int simple_statfs(struct dentry *, struct kstatfs *);
+extern int simple_open(struct inode *inode, struct file *file);
extern int simple_link(struct dentry *, struct inode *, struct dentry *);
extern int simple_unlink(struct inode *, struct dentry *);
extern int simple_rmdir(struct inode *, struct dentry *);
--
GitLab