btrfs: bugfix: handle FS_IOC32_{GETFLAGS,SETFLAGS,GETVERSION} in btrfs_ioctl

32-bit ioctl uses these rather than the regular FS_IOC_* versions. They can
be handled in btrfs using the same code. Without this, 32-bit {ch,ls}attr
fail.

Signed-off-by: Luke Dashjr <luke-jr+git@utopios.org>
Cc: stable@vger.kernel.org
Reviewed-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 84a6a5b..208d199 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -4122,6 +4122,7 @@ void btrfs_test_inode_set_ops(struct inode *inode);
 
 /* ioctl.c */
 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 int btrfs_ioctl_get_supported_features(void __user *arg);
 void btrfs_update_iflags(struct inode *inode);
 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 8d7b5a4..751daac 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2956,7 +2956,7 @@ const struct file_operations btrfs_file_operations = {
        .fallocate      = btrfs_fallocate,
        .unlocked_ioctl = btrfs_ioctl,
 #ifdef CONFIG_COMPAT
-       .compat_ioctl   = btrfs_ioctl,
+       .compat_ioctl   = btrfs_compat_ioctl,
 #endif
        .copy_file_range = btrfs_copy_file_range,
        .clone_file_range = btrfs_clone_file_range,

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2aaba58..167fc3d 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -10184,7 +10184,7 @@ static const struct file_operations btrfs_dir_file_operations = {
        .iterate        = btrfs_real_readdir,
        .unlocked_ioctl = btrfs_ioctl,
 #ifdef CONFIG_COMPAT
-       .compat_ioctl   = btrfs_ioctl,
+       .compat_ioctl   = btrfs_compat_ioctl,
 #endif
        .release        = btrfs_release_file,
        .fsync          = btrfs_sync_file,

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 5a23806..f545f81 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5552,3 +5552,24 @@ long btrfs_ioctl(struct file *file, unsigned int
 
        return -ENOTTY;
 }
+
+#ifdef CONFIG_COMPAT
+long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+       switch (cmd) {
+       case FS_IOC32_GETFLAGS:
+               cmd = FS_IOC_GETFLAGS;
+               break;
+       case FS_IOC32_SETFLAGS:
+               cmd = FS_IOC_SETFLAGS;
+               break;
+       case FS_IOC32_GETVERSION:
+               cmd = FS_IOC_GETVERSION;
+               break;
+       default:
+               return -ENOIOCTLCMD;
+       }
+
+       return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
+}
+#endif