core.sys.linux.fcntl

FALLOC_FL_KEEP_SIZE

Allocates and initializes to zero the disk space within the specified range, but the file size will not be modified.

FALLOC_FL_PUNCH_HOLE

Deallocates space (i.e. creates a hole)

FALLOC_FL_NO_HIDE_STALE

Newly allocated blocks will be marked as initialized.

FALLOC_FL_COLLAPSE_RANGE

Removes a byte range from a file, without leaving a hole

FALLOC_FL_ZERO_RANGE

Zeroes space in the specified byte range

FALLOC_FL_INSERT_RANGE

Increases the file space by inserting a hole without overwriting any existing data

FALLOC_FL_UNSHARE_RANGE

Used to unshare shared blocks within the file size without overwriting any existing data

F_OFD_GETLK

Queries the system if the lock could be placed

F_OFD_SETLK

Acquires or releases an open file description lock

F_OFD_SETLKW

Same as F_OFD_SETLK, but waits if a conflicting lock is held on the file