diff options
| -rw-r--r-- | fs/btrfs/ioctl.c | 16 | ||||
| -rw-r--r-- | include/uapi/linux/btrfs.h | 1 |
2 files changed, 17 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 93b01fe6c731..60d3d37ef9a2 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3498,6 +3498,20 @@ 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 @@ -4706,6 +4720,8 @@ 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; diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index b4d69092fbdb..1b8a0f4c9590 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -558,6 +558,7 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code) #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, __u64) #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \ struct btrfs_ioctl_space_args) +#define BTRFS_IOC_GLOBAL_RSV _IOR(BTRFS_IOCTL_MAGIC, 20, __u64) #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64) #define BTRFS_IOC_WAIT_SYNC _IOW(BTRFS_IOCTL_MAGIC, 22, __u64) #define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \ |