dmapi support in XFS

[girish chandrashekara <girish_c_99@xxxxxxxxx>]

Hi,
  Iam working on dmapi support in VFS layer of linux
to make it generic for underlying file systems. In the
process I went through your source code
for dmapi support in XFS(2.4.0-test5 kernel), I need
some clarifications (correct me if Iam wrongly
understood)

(1)Data events are triggered by the caller(through
xfs_ioctls, xfs_dm_fcntl) except create(truncate
event). How XFS manages (trigger implicitly-initiated
by kernel)to send data event to DM application incase
of read,write and mmap by user application on the
managed region

(2)Nospace event is also triggered through xfs_ioctl
when filesystem  runs out of space. How XFS triggers
nospace event implicitly, when filesystem runs out of
space

thanks in advance

regards
girish_c









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