[PATCH v5 07/29] ceph: fix compat_ioctl for ceph_dir_operations

[Arnd Bergmann]

The ceph_ioctl function is used both for files and directories, but only
the files support doing that in 32-bit compat mode.

For consistency, add the same compat handler to the dir operations
as well, and use a handler that applies the appropriate compat_ptr()
conversion.

Reviewed-by: "Yan, Zheng" <z...@redhat.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 fs/ceph/dir.c   |  1 +
 fs/ceph/file.c  |  2 +-
 fs/ceph/super.h | 10 ++++++++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 4ca0b8ff9a72..401c17d36b71 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1808,6 +1808,7 @@ const struct file_operations ceph_dir_fops = {
        .open = ceph_open,
        .release = ceph_release,
        .unlocked_ioctl = ceph_ioctl,
+       .compat_ioctl = ceph_compat_ioctl,
        .fsync = ceph_fsync,
        .lock = ceph_lock,
        .flock = ceph_flock,
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 685a03cc4b77..99712b6b1ad5 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -2138,7 +2138,7 @@ const struct file_operations ceph_file_fops = {
        .splice_read = generic_file_splice_read,
        .splice_write = iter_file_splice_write,
        .unlocked_ioctl = ceph_ioctl,
-       .compat_ioctl   = ceph_ioctl,
+       .compat_ioctl = ceph_compat_ioctl,
        .fallocate      = ceph_fallocate,
        .copy_file_range = ceph_copy_file_range,
 };
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index d2352fd95dbc..0aebccd48fa0 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -6,6 +6,7 @@
 
 #include <asm/unaligned.h>
 #include <linux/backing-dev.h>
+#include <linux/compat.h>
 #include <linux/completion.h>
 #include <linux/exportfs.h>
 #include <linux/fs.h>
@@ -1108,6 +1109,15 @@ extern void ceph_readdir_cache_release(struct 
ceph_readdir_cache_control *ctl);
 
 /* ioctl.c */
 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+static inline long
+ceph_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+#ifdef CONFIG_COMPAT
+       return ceph_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+#else
+       return -ENOTTY;
+#endif
+}
 
 /* export.c */
 extern const struct export_operations ceph_export_ops;
-- 
2.20.0