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debugfs: add support for more elaborate ->d_fsdata

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Currently, the user provided fops, "real_fops", are stored directly into
->d_fsdata.

In order to be able to store more per-file state and thus prepare for more
granular file removal protection, wrap the real_fops into a dynamically
allocated container struct, debugfs_fsdata.

A struct debugfs_fsdata gets allocated at file creation and freed from the
newly intoduced ->d_release().

Finally, move the implementation of debugfs_real_fops() out of the public
debugfs header such that struct debugfs_fsdata's declaration can be kept
private.

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolai Stange 2017-10-31 00:15:47 +01:00 • committed by Greg Kroah-Hartman
parent 2ec1615017
commit 7c8d469877
4 changed files with 38 additions and 20 deletions
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20
include/linux/debugfs.h
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@ -45,23 +45,6 @@ extern struct dentry *arch_debugfs_dir;
extern struct srcu_struct debugfs_srcu;
/**
* debugfs_real_fops - getter for the real file operation
* @filp: a pointer to a struct file
*
* Must only be called under the protection established by
* debugfs_use_file_start().
*/
static inline const struct file_operations *debugfs_real_fops(const struct file *filp)
__must_hold(&debugfs_srcu)
{
/*
* Neither the pointer to the struct file_operations, nor its
* contents ever change -- srcu_dereference() is not needed here.
*/
return filp->f_path.dentry->d_fsdata;
}
#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
static int __fops ## _open(struct inode *inode, struct file *file) \
{ \
@ -112,6 +95,9 @@ int debugfs_use_file_start(const struct dentry *dentry, int *srcu_idx)
void debugfs_use_file_finish(int srcu_idx) __releases(&debugfs_srcu);
const struct file_operations *debugfs_real_fops(const struct file *filp)
__must_hold(&debugfs_srcu);
ssize_t debugfs_attr_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos);
ssize_t debugfs_attr_write(struct file *file, const char __user *buf,