diff options
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 9aaba6e472d..9213d39d36c 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1843,6 +1843,49 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) return 0; } +long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) +{ + struct btrfs_ioctl_space_args space_args; + struct btrfs_ioctl_space_info space; + struct btrfs_ioctl_space_info *dest; + struct btrfs_space_info *info; + int ret = 0; + + if (copy_from_user(&space_args, + (struct btrfs_ioctl_space_args __user *)arg, + sizeof(space_args))) + return -EFAULT; + + space_args.total_spaces = 0; + dest = (struct btrfs_ioctl_space_info *) + (arg + sizeof(struct btrfs_ioctl_space_args)); + + rcu_read_lock(); + list_for_each_entry_rcu(info, &root->fs_info->space_info, list) { + if (!space_args.space_slots) { + space_args.total_spaces++; + continue; + } + if (space_args.total_spaces >= space_args.space_slots) + break; + space.flags = info->flags; + space.total_bytes = info->total_bytes; + space.used_bytes = info->bytes_used; + if (copy_to_user(dest, &space, sizeof(space))) { + ret = -EFAULT; + break; + } + dest++; + space_args.total_spaces++; + } + rcu_read_unlock(); + + if (copy_to_user(arg, &space_args, sizeof(space_args))) + ret = -EFAULT; + + return ret; +} + /* * there are many ways the trans_start and trans_end ioctls can lead * to deadlocks. They should only be used by applications that @@ -1915,6 +1958,8 @@ long btrfs_ioctl(struct file *file, unsigned int return btrfs_ioctl_tree_search(file, argp); case BTRFS_IOC_INO_LOOKUP: return btrfs_ioctl_ino_lookup(file, argp); + case BTRFS_IOC_SPACE_INFO: + return btrfs_ioctl_space_info(root, argp); case BTRFS_IOC_SYNC: btrfs_sync_fs(file->f_dentry->d_sb, 1); return 0; |