linux-kernel - [PATCH 1/2] exfat: add initial ioctl function

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Date:   Mon, 15 Feb 2021 13:24:10 +0900
From:   Hyeongseok Kim <hyeongseok@...il.com>
To:     namjae.jeon@...sung.com, sj1557.seo@...sung.com
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hyeongseok Kim <hyeongseok@...il.com>
Subject: [PATCH 1/2] exfat: add initial ioctl function

Initialize empty ioctl function

Signed-off-by: Hyeongseok Kim <hyeongseok@...il.com>
---
 fs/exfat/dir.c      |  5 +++++
 fs/exfat/exfat_fs.h |  3 +++
 fs/exfat/file.c     | 21 +++++++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index 916797077aad..e1d5536de948 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/compat.h>
 #include <linux/bio.h>
 #include <linux/buffer_head.h>
 
@@ -306,6 +307,10 @@ const struct file_operations exfat_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
 	.iterate	= exfat_iterate,
+	.unlocked_ioctl = exfat_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = exfat_compat_ioctl,
+#endif
 	.fsync		= exfat_file_fsync,
 };
 
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 764bc645241e..a183021ae31d 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -420,6 +420,9 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr);
 int exfat_getattr(const struct path *path, struct kstat *stat,
 		unsigned int request_mask, unsigned int query_flags);
 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
+long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
+				unsigned long arg);
 
 /* namei.c */
 extern const struct dentry_operations exfat_dentry_ops;
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index a92478eabfa4..679828e7be07 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/compat.h>
 #include <linux/cred.h>
 #include <linux/buffer_head.h>
 #include <linux/blkdev.h>
@@ -348,6 +349,22 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr)
 	return error;
 }
 
+long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	default:
+		return -ENOTTY;
+	}
+}
+
+#ifdef CONFIG_COMPAT
+long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
+				unsigned long arg)
+{
+	return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
 {
 	struct inode *inode = filp->f_mapping->host;
@@ -368,6 +385,10 @@ const struct file_operations exfat_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read_iter	= generic_file_read_iter,
 	.write_iter	= generic_file_write_iter,
+	.unlocked_ioctl = exfat_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = exfat_compat_ioctl,
+#endif
 	.mmap		= generic_file_mmap,
 	.fsync		= exfat_file_fsync,
 	.splice_read	= generic_file_splice_read,
-- 
2.27.0.83.g0313f36