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Commit 20955e89 authored by Stephen Boyd's avatar Stephen Boyd Committed by Linus Torvalds
Browse files

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: default avatarStephen Boyd <sboyd@codeaurora.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7563ec4c

fs/libfs.c

+8 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -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 *);