• Linus Torvalds's avatar
    Merge tag 'upstream-3.7-rc1-fastmap' of git://git.infradead.org/linux-ubi · e9eca4de
    Linus Torvalds authored
    Pull UBI fastmap changes from Artem Bityutskiy:
     "This pull request contains the UBI fastmap support implemented by
      Richard Weinberger from Linutronix.  Fastmap is designed to address
      UBI's slow scanning issues.  Namely, it introduces a new on-flash
      data-structure called "fastmap", which stores the information about
      logical<->physical eraseblocks mappings.  So now to get this
      information just read the fastmap, instead of doing full scan.  More
      information here can be found in Richard's announcement in LKML
      (Subject: UBI: Fastmap request for inclusion (v19)):
    
         http://thread.gmane.org/gmane.linux.kernel/1364922/focus=1369109
    
      One thing I want to explicitly say is that fastmap did not have large
      enough linux-next exposure.  It is partially my fault - I did not
      respond quickly enough.  I _really_ apologize for this.  But it had
      good testing and disabled by default, so I do not expect that we'll
      break anything.
    
      Fastmap is declared as experimental so far, and it is off by default.
      We did declare that the on-flash format may be changed.  The reason
      for this is that no one used it in real production so far, so there is
      a high risk that something is missing.  Besides, we do not have
      user-space tools supporting fastmap so far.
    
      Nevertheless, I suggest we merge this feature.  Many people want UBI's
      scanning bottleneck to be fixed and merging fastmap now should
      accelerate its production use.  The plan is to make it bullet-prove,
      somewhat clean-up, and make it the default for UBI.  I do not know how
      many kernel releases will it take.
    
      Basically, I what I want to do for fastmap is something like Linus did
      for btrfs few years ago."
    
    * tag 'upstream-3.7-rc1-fastmap' of git://git.infradead.org/linux-ubi:
      UBI: Wire-up fastmap
      UBI: Add fastmap core
      UBI: Add fastmap support to the WL sub-system
      UBI: Add fastmap stuff to attach.c
      UBI: Wire-up ->fm_sem
      UBI: Add fastmap bits to build.c
      UBI: Add self_check_eba()
      UBI: Export next_sqnum()
      UBI: Add fastmap stuff to ubi.h
      UBI: Add fastmap on-flash data structures
    e9eca4de
MAINTAINERS 222 KB