fuse: allow umask processing in userspace

This patch lets filesystems handle masking the file mode on creation.
This is needed if filesystem is using ACLs.

 - The CREATE, MKDIR and MKNOD requests are extended with a "umask"
   parameter.

 - A new FUSE_DONT_MASK flag is added to the INIT request/reply.  With
   this the filesystem may request that the create mode is not masked.

CC: Jean-Pierre André <jean-pierre.andre@wanadoo.fr>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

1 files changed, 18 insertions, 2 deletions

diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index d41ed593f79f..e2b816a62488 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -25,6 +25,9 @@
  *  - add IOCTL message
  *  - add unsolicited notification support
  *  - add POLL message and NOTIFY_POLL notification
+ *
+ * 7.12
+ *  - add umask flag to input argument of open, mknod and mkdir
  */
 
 #ifndef _LINUX_FUSE_H
@@ -36,7 +39,7 @@
 #define FUSE_KERNEL_VERSION 7
 
 /** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 11
+#define FUSE_KERNEL_MINOR_VERSION 12
 
 /** The node ID of the root inode */
 #define FUSE_ROOT_ID 1
@@ -112,6 +115,7 @@ struct fuse_file_lock {
  * INIT request/reply flags
  *
  * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
+ * FUSE_DONT_MASK: don't apply umask to file mode on create operations
  */
 #define FUSE_ASYNC_READ         (1 << 0)
 #define FUSE_POSIX_LOCKS        (1 << 1)
@@ -119,6 +123,7 @@ struct fuse_file_lock {
 #define FUSE_ATOMIC_O_TRUNC     (1 << 3)
 #define FUSE_EXPORT_SUPPORT     (1 << 4)
 #define FUSE_BIG_WRITES         (1 << 5)
+#define FUSE_DONT_MASK          (1 << 6)
 
 /**
  * CUSE INIT request/reply flags
@@ -262,14 +267,18 @@ struct fuse_attr_out {
         struct fuse_attr attr;
 };
 
+#define FUSE_COMPAT_MKNOD_IN_SIZE 8
+
 struct fuse_mknod_in {
         __u32   mode;
         __u32   rdev;
+        __u32   umask;
+        __u32   padding;
 };
 
 struct fuse_mkdir_in {
         __u32   mode;
-        __u32   padding;
+        __u32   umask;
 };
 
 struct fuse_rename_in {
@@ -301,7 +310,14 @@ struct fuse_setattr_in {
 
 struct fuse_open_in {
         __u32   flags;
+        __u32   unused;
+};
+
+struct fuse_create_in {
+        __u32   flags;
         __u32   mode;
+        __u32   umask;
+        __u32   padding;
 };
 
 struct fuse_open_out {