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debugfs: introduce a public file_operations accessor

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This patch introduces an accessor which can be used
by the users of debugfs (drivers, fs, ...) to get the
original file_operations struct. It also removes the
REAL_FOPS_DEREF macro in file.c and converts the code
to use the public version.

Previously, REAL_FOPS_DEREF was only available within
the file.c of debugfs. But having a public getter
available for debugfs users is important as some
drivers (carl9170 and b43) use the pointer of the
original file_operations in conjunction with container_of()
within their debugfs implementations.

Reviewed-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Cc: stable <stable@vger.kernel.org> # 4.7+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Lamparter
2016-09-17 21:43:01 +02:00
committed by Greg Kroah-Hartman
parent 2f5bb02ff2
commit 86f0e06767
2 changed files with 22 additions and 8 deletions
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17
include/linux/debugfs.h
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@@ -45,6 +45,23 @@ 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(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;
}
#if defined(CONFIG_DEBUG_FS)
struct dentry *debugfs_create_file(const char *name, umode_t mode,