Revert "btrfs: add ioctl to export size of global metadata reservation"

This reverts commit 01e219e8069516cdb98594d417b8bb8d906ed30d.

David Sterba found a different way to provide these features without adding a new
ioctl.  We haven't released any progs with this ioctl yet, so I'm taking this out
for now until we finalize things.

Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
CC: Jeff Mahoney <jeffm@suse.com>

1 files changed, 0 insertions, 16 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ebdd866d4cfd..9a9044585da7 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3559,20 +3559,6 @@ out:
         return ret;
 }
 
-static long btrfs_ioctl_global_rsv(struct btrfs_root *root, void __user *arg)
-{
-        struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
-        u64 reserved;
-
-        spin_lock(&block_rsv->lock);
-        reserved = block_rsv->reserved;
-        spin_unlock(&block_rsv->lock);
-
-        if (arg && copy_to_user(arg, &reserved, sizeof(reserved)))
-                return -EFAULT;
-        return 0;
-}
-
 /*
  * there are many ways the trans_start and trans_end ioctls can lead
  * to deadlocks.  They should only be used by applications that
@@ -4779,8 +4765,6 @@ long btrfs_ioctl(struct file *file, unsigned int
                 return btrfs_ioctl_logical_to_ino(root, argp);
         case BTRFS_IOC_SPACE_INFO:
                 return btrfs_ioctl_space_info(root, argp);
-        case BTRFS_IOC_GLOBAL_RSV:
-                return btrfs_ioctl_global_rsv(root, argp);
         case BTRFS_IOC_SYNC: {
                 int ret;