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From: Poul-Henning Kamp <phk@FreeBSD.ORG>
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Date: Sat, 5 Sep 1998 07:13:13 -0700 (PDT)
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Subject: cvs commit: src/sys/kern vfs_bio.c vnode_if.src
         src/sys/miscfs/specfs spec_vnops.c src/sys/sys buf.h conf.h
         src/sys/ufs/ffs ffs_alloc.c
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phk         1998/09/05 07:13:13 PDT

  Modified files:
    sys/kern             vfs_bio.c vnode_if.src 
    sys/miscfs/specfs    spec_vnops.c 
    sys/sys              buf.h conf.h 
    sys/ufs/ffs          ffs_alloc.c 
  Log:
  Add a new vnode op, VOP_FREEBLKS(), which filesystems can use to inform
  device drivers about sectors no longer in use.
  
  Device-drivers receive the call through d_strategy, if they have
  D_CANFREE in d_flags.
  
  This allows flash based devices to erase the sectors and avoid
  pointlessly carrying them around in compactions.
  
  Reviewed by:	Kirk Mckusick, bde
  Sponsored by:	M-Systems (www.m-sys.com)
  
  Revision  Changes    Path
  1.175     +10 -9     src/sys/kern/vfs_bio.c
  1.19      +15 -1     src/sys/kern/vnode_if.src
  1.73      +26 -1     src/sys/miscfs/specfs/spec_vnops.c
  1.55      +8 -2      src/sys/sys/buf.h
  1.45      +2 -1      src/sys/sys/conf.h
  1.52      +2 -1      src/sys/ufs/ffs/ffs_alloc.c