fuse: fix ioctl ABI

In kernel ABI version 7.16 and later FUSE_IOCTL_RETRY reply from a
unrestricted IOCTL request shall return with an array of 'struct
fuse_ioctl_iovec' instead of 'struct iovec'.  This fixes the ABI
ambiguity of 32bit vs. 64bit.

Reported-by: "ccmail111" <ccmail111@yahoo.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: Tejun Heo <tj@kernel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index cf11881f4938..d464de53db43 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -44,6 +44,9 @@
  *
  * 7.16
  *  - add BATCH_FORGET request
+ *  - FUSE_IOCTL_UNRESTRICTED shall now return with array of 'struct
+ *    fuse_ioctl_iovec' instead of ambiguous 'struct iovec'
+ *  - add FUSE_IOCTL_32BIT flag
  */
 
 #ifndef _LINUX_FUSE_H
@@ -203,12 +206,14 @@ struct fuse_file_lock {
  * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
  * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
  * FUSE_IOCTL_RETRY: retry with new iovecs
+ * FUSE_IOCTL_32BIT: 32bit ioctl
  *
  * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
  */
 #define FUSE_IOCTL_COMPAT       (1 << 0)
 #define FUSE_IOCTL_UNRESTRICTED (1 << 1)
 #define FUSE_IOCTL_RETRY        (1 << 2)
+#define FUSE_IOCTL_32BIT        (1 << 3)
 
 #define FUSE_IOCTL_MAX_IOV      256
 
@@ -524,6 +529,11 @@ struct fuse_ioctl_in {
         __u32   out_size;
 };
 
+struct fuse_ioctl_iovec {
+        __u64   base;
+        __u64   len;
+};
+
 struct fuse_ioctl_out {
         __s32   result;
         __u32   flags;