linux-kernel - [PATCH 1/5] kernfs: make kernfs_open

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Message-Id: <20161220161053.14994-2-tj@kernel.org>
Date:   Tue, 20 Dec 2016 11:10:49 -0500
From:   Tejun Heo <tj@...nel.org>
To:     gregkh@...uxfoundation.org, lizefan@...wei.com, hannes@...xchg.org
Cc:     linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        kernel-team@...com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 1/5] kernfs: make kernfs_open_file->mmapped a bitfield

More kernfs_open_file->mutex synchronized flags are planned to be
added.  Convert ->mmapped to a bitfield in preparation.

While at it, make kernfs_fop_mmap() use "true" instead of "1" on
->mmapped.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/kernfs/file.c       | 2 +-
 include/linux/kernfs.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 78219d5..d0b6fb1 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -516,7 +516,7 @@ static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma)
 		goto out_put;
 
 	rc = 0;
-	of->mmapped = 1;
+	of->mmapped = true;
 	of->vm_ops = vma->vm_ops;
 	vma->vm_ops = &kernfs_vm_ops;
 out_put:
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 7056238..afd4e5a 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -185,7 +185,7 @@ struct kernfs_open_file {
 	char			*prealloc_buf;
 
 	size_t			atomic_write_len;
-	bool			mmapped;
+	bool			mmapped:1;
 	const struct vm_operations_struct *vm_ops;
 };
 
-- 
2.9.3