• Lukas Czerner's avatar
    ext4: Introduce FALLOC_FL_ZERO_RANGE flag for fallocate · b8a86845
    Lukas Czerner authored
    Introduce new FALLOC_FL_ZERO_RANGE flag for fallocate. This has the same
    functionality as xfs ioctl XFS_IOC_ZERO_RANGE.
    
    It can be used to convert a range of file to zeros preferably without
    issuing data IO. Blocks should be preallocated for the regions that span
    holes in the file, and the entire range is preferable converted to
    unwritten extents
    
    This can be also used to preallocate blocks past EOF in the same way as
    with fallocate. Flag FALLOC_FL_KEEP_SIZE which should cause the inode
    size to remain the same.
    
    Also add appropriate tracepoints.
    Signed-off-by: default avatarLukas Czerner <lczerner@redhat.com>
    Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
    b8a86845
ext4.h 60.9 KB