btrfs-ioctl(3) ================ NAME ---- btrfs-ioctl - documentation for the ioctl interface to btrfs DATA STRUCTURES AND DEFINITIONS ------------------------------- [verse] struct btrfs_ioctl_vol_args { __s64 fd; char name[BTRFS_PATH_NAME_MAX + 1]; }; [verse] struct btrfs_ioctl_vol_args_v2 { \__s64 fd; \__u64 transid; \__u64 flags; union { struct { \__u64 size; struct btrfs_qgroup_inherit \__user *qgroup_inherit; }; __u64 unused[4]; }; char name[BTRFS_SUBVOL_NAME_MAX + 1]; }; [verse] BTRFS_SUBVOL_NAME_MAX = 4039 BTRFS_PATH_NAME_MAX = 4087 LIST OF IOCTLS -------------- BTRFS_IOC_SUBVOL_CREATE -- (obsolete) create a subvolume BTRFS_IOC_SNAP_CREATE BTRFS_IOC_DEFRAG BTRFS_IOC_RESIZE BTRFS_IOC_SCAN_DEV BTRFS_IOC_TRANS_START BTRFS_IOC_TRANS_END BTRFS_IOC_SYNC BTRFS_IOC_CLONE BTRFS_IOC_ADD_DEV BTRFS_IOC_RM_DEV BTRFS_IOC_BALANCE BTRFS_IOC_CLONE_RANGE BTRFS_IOC_SUBVOL_CREATE BTRFS_IOC_SNAP_DESTROY BTRFS_IOC_DEFRAG_RANGE BTRFS_IOC_TREE_SEARCH BTRFS_IOC_TREE_SEARCH_V2 BTRFS_IOC_INO_LOOKUP BTRFS_IOC_DEFAULT_SUBVOL BTRFS_IOC_SPACE_INFO BTRFS_IOC_START_SYNC BTRFS_IOC_WAIT_SYNC BTRFS_IOC_SNAP_CREATE_V2 BTRFS_IOC_SUBVOL_CREATE_V2 -- create a subvolume BTRFS_IOC_SUBVOL_GETFLAGS BTRFS_IOC_SUBVOL_SETFLAGS BTRFS_IOC_SCRUB BTRFS_IOC_SCRUB_CANCEL BTRFS_IOC_SCRUB_PROGRESS BTRFS_IOC_DEV_INFO BTRFS_IOC_FS_INFO BTRFS_IOC_BALANCE_V2 BTRFS_IOC_BALANCE_CTL BTRFS_IOC_BALANCE_PROGRESS BTRFS_IOC_INO_PATHS BTRFS_IOC_LOGICAL_INO BTRFS_IOC_SET_RECEIVED_SUBVOL BTRFS_IOC_SEND BTRFS_IOC_DEVICES_READY BTRFS_IOC_QUOTA_CTL BTRFS_IOC_QGROUP_ASSIGN BTRFS_IOC_QGROUP_CREATE BTRFS_IOC_QGROUP_LIMIT BTRFS_IOC_QUOTA_RESCAN BTRFS_IOC_QUOTA_RESCAN_STATUS BTRFS_IOC_QUOTA_RESCAN_WAIT BTRFS_IOC_GET_FSLABEL BTRFS_IOC_SET_FSLABEL BTRFS_IOC_GET_DEV_STATS BTRFS_IOC_DEV_REPLACE BTRFS_IOC_FILE_EXTENT_SAME BTRFS_IOC_GET_FEATURES BTRFS_IOC_SET_FEATURES BTRFS_IOC_GET_SUPPORTED_FEATURES DETAILED DESCRIPTION -------------------- BTRFS_IOC_SUBVOL_CREATE ~~~~~~~~~~~~~~~~~~~~~~~ NOTE: obsoleted by BTRFS_IOC_SUBVOL_CREATE_V2 _(since: 3.0, obsoleted: 4.0)_ Create a subvolume. ioctl fd:: file descriptor of the parent directory of the new subvolume argument:: struct btrfs_ioctl_vol_args fd:: ignored name:: name of the subvolume, although the buffer can be almost 4k, the file size is limited by linux VFS to 255 characters and must not contain a slash ('/') BTRFS_IOC_SUBVOL_CREATE_V2 ~~~~~~~~~~~~~~~~~~~~~~~~~~ NOTE: obsoletes BTRFS_IOC_SUBVOL_CREATE _(since: 3.6)_ Create a subvolume, qgroup inheritance can be specified. ioctl fd:: file descriptor of the parent directory of the new subvolume argument:: struct btrfs_ioctl_vol_args_v2 fd:: ignored transid:: ignored flags:: ignored size:: ... qgroup_inherit:: ... name:: name of the subvolume, although the buffer can be almost 4k, the file size is limited by linux VFS to 255 characters and must not contain a slash ('/') devid:: ... AVAILABILITY ------------ *btrfs* is part of btrfs-progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details. SEE ALSO -------- `ioctl`(2)