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authorChristian Lamparter <chunkeey@googlemail.com>2016-09-17 22:43:01 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-21 13:13:31 +0300
commit86f0e06767dda7863d6d2a8f0b3b857e6ea876a0 (patch)
tree0bba8aec84b2143fa932cc40e4ea8738d859463a /include/linux/debugfs.h
parent2f5bb02ff22414ce156cacb163dd594b017af357 (diff)
downloadlinux-86f0e06767dda7863d6d2a8f0b3b857e6ea876a0.tar.xz
debugfs: introduce a public file_operations accessor
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>
Diffstat (limited to 'include/linux/debugfs.h')
-rw-r--r--include/linux/debugfs.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 1438e2322d5c..4d3f0d1aec73 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -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,