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  1. 13 Jul, 2012 10 commits
  3. 27 Jun, 2012 4 commits
  5. 23 Jun, 2012 1 commit
  7. 21 Jun, 2012 10 commits
  9. 20 Jun, 2012 2 commits
  11. 14 Jun, 2012 3 commits
    • Vinod Koul's avatar
      Merge branch 'fixes' into next · 0a076035
      Vinod Koul authored
      0a076035
    • Linus Walleij's avatar
      dma: coh901318: use devm allocation · f7ceb362
      Linus Walleij authored 
      Allocate memory, region, remap and irq for device state using
devm_* helpers to simplify memory accounting.
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
      f7ceb362
    • Javi Merino's avatar
      DMA: PL330: Fix racy mutex unlock · fdec53d5
      Javi Merino authored 
      pl330_update() stores a pointer to the thrd->req that finished, which
contains a pointer to the corresponding pl330_req.  This is done with
the pl330_lock held.  Then, it iterates through the req_done list,
calling the callback for each of the requests that are done.  The
problem is that the driver releases the lock before calling the
callback for each of the callbacks.  pl330_submit_req() running in
another processor can then acquire the lock and insert another request
in one of the thrd->req that hasn't been processed yet, replacing the
pointer to pl330_req there.  When the callback returns in
pl330_update() and the next rqdone is popped from the list, it
dereferences the pl330_req pointer to the just scheduled pl330_req,
instead of the one that has finished, calling pl330 with the wrong r.

This patch fixes this by storing the pointer to pl330_req directly in
the list.
Signed-off-by: default avatarJavi Merino <javi.merino@arm.com>
Cc: Jassi Brar <jaswinder.singh@linaro.org>
Acked-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
      fdec53d5
  13. 12 Jun, 2012 1 commit
  15. 08 Jun, 2012 2 commits
  17. 07 Jun, 2012 4 commits
  19. 03 Jun, 2012 2 commits
  21. 02 Jun, 2012 1 commit
    • Joe Thornber's avatar
      dm thin: provide userspace access to pool metadata · cc8394d8
      Joe Thornber authored 
      This patch implements two new messages that can be sent to the thin
pool target allowing it to take a snapshot of the _metadata_.  This,
read-only snapshot can be accessed by userland, concurrently with the
live target.

Only one metadata snapshot can be held at a time.  The pool's status
line will give the block location for the current msnap.

Since version 0.1.5 of the userland thin provisioning tools, the
thin_dump program displays the msnap as follows:

    thin_dump -m <msnap root> <metadata dev>

Available here: https://github.com/jthornber/thin-provisioning-tools

Now that userland can access the metadata we can do various things
that have traditionally been kernel side tasks:

     i) Incremental backups.

     By using metadata snapshots we can work out what blocks have
     changed over time.  Combined with data snapshots we can ensure
     the data doesn't change while we back it up.

     A short proof of concept script can be found here:

     https://github.com/jthornber/thinp-test-suite/blob/master/incremental_backup_example.rb

     ii) Migration of thin devices from one pool to another.

     iii) Merging snapshots back into an external origin.

     iv) Asyncronous replication.
Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
      cc8394d8
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