• Brian Foster's avatar
    xfs: xfs_dquot prealloc throttling watermarks and low free space · b1366451
    Brian Foster authored
    Enable tracking of high and low watermarks for preallocation
    throttling of files under quota restrictions. These values are
    calculated when the quota limit is read from disk or modified and
    cached for later use by the throttling algorithm.
    
    The high watermark specifies when preallocation is disabled, the
    low watermark specifies when throttling is enabled and the low free
    space data structure contains precalculated low free space limits
    to serve as input to determine the level of throttling required.
    
    Note that the low free space data structure is based on the
    existing global low free space data structure with the exception of
    using three stages (5%, 3% and 1%) rather than five to reduce the
    impact of xfs_dquot memory overhead.
    Signed-off-by: default avatarBrian Foster <bfoster@redhat.com>
    Reviewed-by: default avatarMark Tinguely <tinguely@sgi.com>
    Signed-off-by: default avatarBen Myers <bpm@sgi.com>
    b1366451
xfs_qm_syscalls.c 24.1 KB