Diff for /wikisrc/projects/project/ffs-discard.mdwn between versions 1.1 and 1.2

version 1.1, 2015/11/25 07:23:21 version 1.2, 2016/08/26 19:35:19
Line 14  difficulty="medium" Line 14  difficulty="medium"
 duration="2-3 months"  duration="2-3 months"
   
 description="""  description="""
 The fdiscard system call, and the file-system-level discard operation  The fdiscard system call, and the file-system-level VOP_DISCARD operation
 backing it, allow dropping ranges of blocks from files to create  backing it, allow dropping ranges of blocks from files to create
 sparse files with holes.  sparse files with holes.
 This is a simple generalization of truncate.  This is a simple generalization of truncate.
Line 24  Discard is not currently implemented for Line 24  Discard is not currently implemented for
 It should be possible to do so by generalizing the existing truncate  It should be possible to do so by generalizing the existing truncate
 code; this should be not super-difficult, but somewhat messy.  code; this should be not super-difficult, but somewhat messy.
   
   Note that it's important (for both the WAPBL and non-WAPBL cases) to
   preserve the on-disk invariants needed for successful crash recovery.
   
 """  """
   
 ]]  ]]

Removed from v.1.1  
changed lines
  Added in v.1.2


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