1. 13 Jul, 2012 6 commits
  2. 27 Jun, 2012 4 commits
  3. 23 Jun, 2012 1 commit
  4. 21 Jun, 2012 10 commits
  5. 20 Jun, 2012 2 commits
  6. 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
  7. 12 Jun, 2012 1 commit
  8. 08 Jun, 2012 2 commits
  9. 07 Jun, 2012 4 commits
  10. 03 Jun, 2012 2 commits
  11. 02 Jun, 2012 5 commits
    • 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
    • Mike Snitzer's avatar
      dm thin: use slab mempools · a24c2569
      Mike Snitzer authored
      Use dedicated caches prefixed with a "dm_" name rather than relying on
      kmalloc mempools backed by generic slab caches so the memory usage of
      thin provisioning (and any leaks) can be accounted for independently.
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
      a24c2569
    • Mikulas Patocka's avatar
      dm mpath: allow ioctls to trigger pg init · 35991652
      Mikulas Patocka authored
      After the failure of a group of paths, any alternative paths that
      need initialising do not become available until further I/O is sent to
      the device.  Until this has happened, ioctls return -EAGAIN.
      
      With this patch, new paths are made available in response to an ioctl
      too.  The processing of the ioctl gets delayed until this has happened.
      
      Instead of returning an error, we submit a work item to kmultipathd
      (that will potentially activate the new path) and retry in ten
      milliseconds.
      
      Note that the patch doesn't retry an ioctl if the ioctl itself fails due
      to a path failure.  Such retries should be handled intelligently by the
      code that generated the ioctl in the first place, noting that some SCSI
      commands should not be retried because they are not idempotent (XOR write
      commands).  For commands that could be retried, there is a danger that
      if the device rejected the SCSI command, the path could be errorneously
      marked as failed, and the request would be retried on another path which
      might fail too.  It can be determined if the failure happens on the
      device or on the SCSI controller, but there is no guarantee that all
      SCSI drivers set these flags correctly.
      Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
      Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
      35991652
    • Mike Christie's avatar
      dm mpath: delay retry of bypassed pg · f220fd4e
      Mike Christie authored
      If I/O needs retrying and only bypassed priority groups are available,
      set the pg_init_delay_retry flag to wait before retrying.
      
      If, for example, the reason for the bypass is that the controller is
      getting reset or there is a firmware upgrade happening, retrying right
      away would cause a flood of log messages and retries for what could be a
      few seconds or even several minutes.
      Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
      Acked-by: default avatarMike Snitzer <snitzer@redhat.com>
      Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
      f220fd4e
    • Mike Snitzer's avatar
      dm mpath: reduce size of struct multipath · 1fbdd2b3
      Mike Snitzer authored
      Move multipath structure's 'lock' and 'queue_size' members to eliminate
      two 4-byte holes.  Also use a bit within a single unsigned int for each
      existing flag (saves 8-bytes).  This allows future flags to be added
      without each consuming an unsigned int.
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Acked-by: default avatarHannes Reinecke <hare@suse.de>
      Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
      1fbdd2b3