[PATCH 14/15] btrfs: Disable dax-based defrag and send

[Goldwyn Rodrigues]

From: Goldwyn Rodrigues <rgold...@suse.com>

This is temporary, and a TODO.

Signed-off-by: Goldwyn Rodrigues <rgold...@suse.com>
---
 fs/btrfs/ioctl.c | 13 +++++++++++++
 fs/btrfs/send.c  |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2e5137b01561..f532a8df2026 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2980,6 +2980,12 @@ static int btrfs_ioctl_defrag(struct file *file, void 
__user *argp)
                        goto out;
                }
 
+               if (IS_DAX(inode)) {
+                       btrfs_warn(root->fs_info, "File defrag is not supported 
with DAX");
+                       ret = -EOPNOTSUPP;
+                       goto out;
+               }
+
                if (argp) {
                        if (copy_from_user(range, argp,
                                           sizeof(*range))) {
@@ -4647,6 +4653,10 @@ static long btrfs_ioctl_balance(struct file *file, void 
__user *arg)
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
+       /* send can be on a directory, so check super block instead */
+       if (btrfs_test_opt(fs_info, DAX))
+               return -EOPNOTSUPP;
+
        ret = mnt_want_write_file(file);
        if (ret)
                return ret;
@@ -5499,6 +5509,9 @@ static int _btrfs_ioctl_send(struct file *file, void 
__user *argp, bool compat)
        struct btrfs_ioctl_send_args *arg;
        int ret;
 
+       if (IS_DAX(file_inode(file)))
+               return -EOPNOTSUPP;
+
        if (compat) {
 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
                struct btrfs_ioctl_send_args_32 args32;
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 7ea2d6b1f170..9679fd54db86 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -6609,6 +6609,10 @@ long btrfs_ioctl_send(struct file *mnt_file, struct 
btrfs_ioctl_send_args *arg)
        int sort_clone_roots = 0;
        int index;
 
+       /* send can be on a directory, so check super block instead */
+       if (btrfs_test_opt(fs_info, DAX))
+               return -EOPNOTSUPP;
+
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
-- 
2.16.4