1. 13 Jun, 2012 4 commits
  2. 12 Jun, 2012 4 commits
    • Lars Ellenberg's avatar
      drbd: fix null pointer dereference with on-congestion policy when diskless · 0d5934e3
      Lars Ellenberg authored
      We must not look at mdev->actlog, unless we have a get_ldev() reference.
      It also does not make much sense to try to disconnect or pull-ahead of
      the peer, if we don't have good local data.
      
      Only even consider congestion policies, if our local disk is D_UP_TO_DATE.
      Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
      Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
      0d5934e3
    • Lars Ellenberg's avatar
      drbd: fix list corruption by failing but already aborted reads · 1ed25b26
      Lars Ellenberg authored
      If a read is aborted due to force-detach of a supposedly unresponsive
      local backing device, and retried on the peer, it can happen that the
      local request later still completes (hopefully with an error).
      As it may already have been completed to upper layers meanwhile,
      it must not be retried again now.
      Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
      Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
      1ed25b26
    • Lars Ellenberg's avatar
      drbd: fix access of unallocated pages and kernel panic · 4eccc579
      Lars Ellenberg authored
      BUG: unable to handle kernel NULL pointer dereference at (null)
      ...
       [<d1e17561>] ? _drbd_bm_set_bits+0x151/0x240 [drbd]
       [<d1e236f8>] ? receive_bitmap+0x4f8/0xbc0 [drbd]
      
      This fixes an off-by-one error in the receive_bitmap() path,
      if run-length encoded bitmap transfer is enabled.
      
      If the bitmap is an exact multiple of PAGE_SIZE, which means the visible
      capacity of the drbd device is an exact multiple of 128 MiB (for 4k page
      size), and bitmap compression (use-rle) is enabled (which became default
      with 8.4), and the very last bit is dirty and reported in an rle
      comressed bitmap packet, we ended up trying to kmap_atomic a page pointer
      that does not exist (bitmap->bm_pages[last index + 1]).
      
      bug introduced by:
          Date:   Fri Jul 24 15:33:24 2009 +0200
          set bits: optimize for complete last word, fix off-by-one-word corner case
      
      made effective by:
          Date:   Thu Dec 16 00:32:38 2010 +0100
          drbd: get rid of unused debug code
      
          Long time ago, we had paranoia code in the bitmap that allocated one
          extra word, assigned a magic value, and checked on every occasion that
          the magic value was still unchanged.
      
          That debug code is unused, the extra long word complicates code a bit.
          Get rid of it.
      
      No-one triggered this bug in the last few years, because a large subset
      of our userbase is unaffected:
       * typically the last few blocks of a device are not modified
         frequently, and remain unset
       * use-rle was disabled by default in drbd < 8.4
       * those with slightly "odd" device sizes, or
       * drbd internal meta data (which will skew the device size slightly,
         thus makes it harder to have a bug relevant device size)
      Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
      Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
      4eccc579
    • Konrad Rzeszutek Wilk's avatar
      xen/blkfront: Add WARN to deal with misbehaving backends. · 6878c32e
      Konrad Rzeszutek Wilk authored
      Part of the ring structure is the 'id' field which is under
      control of the frontend. The frontend stamps it with "some"
      value (this some in this implementation being a value less
      than BLK_RING_SIZE), and when it gets a response expects
      said value to be in the response structure. We have a check
      for the id field when spolling new requests but not when
      de-spolling responses.
      
      We also add an extra check in add_id_to_freelist to make
      sure that the 'struct request' was not NULL - as we cannot
      pass a NULL to __blk_end_request_all, otherwise that crashes
      (and all the operations that the response is dealing with
      end up with __blk_end_request_all).
      
      Lastly we also print the name of the operation that failed.
      
      [v1: s/BUG/WARN/ suggested by Stefano]
      [v2: Add extra check in add_id_to_freelist]
      [v3: Redid op_name per Jan's suggestion]
      [v4: add const * and add WARN on failure returns]
      Acked-by: default avatarJan Beulich <jbeulich@suse.com>
      Acked-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
      Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      6878c32e
  3. 06 Jun, 2012 1 commit
  4. 05 Jun, 2012 2 commits
  5. 04 Jun, 2012 8 commits
    • Tejun Heo's avatar
      blkcg: fix blkg_alloc() failure path · 9b2ea86b
      Tejun Heo authored
      When policy data allocation fails in the middle, blkg_alloc() invokes
      blkg_free() to destroy the half constructed blkg.  This ends up
      calling pd_exit_fn() on policy datas which didn't go through
      pd_init_fn().  Fix it by making blkg_alloc() call pd_init_fn()
      immediately after each policy data allocation.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      9b2ea86b
    • Tejun Heo's avatar
      block: blkcg_policy_cfq shouldn't be used if !CONFIG_CFQ_GROUP_IOSCHED · ffea73fc
      Tejun Heo authored
      cfq may be built w/ or w/o blkcg support depending on
      CONFIG_CFQ_CGROUP_IOSCHED.  If blkcg support is disabled, most of
      related code is ifdef'd out but some part is left dangling -
      blkcg_policy_cfq is left zero-filled and blkcg_policy_[un]register()
      calls are made on it.
      
      Feeding zero filled policy to blkcg_policy_register() is incorrect and
      triggers the following WARN_ON() if CONFIG_BLK_CGROUP &&
      !CONFIG_CFQ_GROUP_IOSCHED.
      
       ------------[ cut here ]------------
       WARNING: at block/blk-cgroup.c:867
       Modules linked in:
       Modules linked in:
       CPU: 3 Not tainted 3.4.0-09547-gfb21affa #1
       Process swapper/0 (pid: 1, task: 000000003ff80000, ksp: 000000003ff7f8b8)
       Krnl PSW : 0704100180000000 00000000003d76ca (blkcg_policy_register+0xca/0xe0)
      	    R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0 EA:3
       Krnl GPRS: 0000000000000000 00000000014b85ec 00000000014b85b0 0000000000000000
      	    000000000096fb60 0000000000000000 00000000009a8e78 0000000000000048
      	    000000000099c070 0000000000b6f000 0000000000000000 000000000099c0b8
      	    00000000014b85b0 0000000000667580 000000003ff7fd98 000000003ff7fd70
       Krnl Code: 00000000003d76be: a7280001           lhi     %r2,1
      	    00000000003d76c2: a7f4ffdf           brc     15,3d7680
      	   #00000000003d76c6: a7f40001           brc     15,3d76c8
      	   >00000000003d76ca: a7c8ffea           lhi     %r12,-22
      	    00000000003d76ce: a7f4ffce           brc     15,3d766a
      	    00000000003d76d2: a7f40001           brc     15,3d76d4
      	    00000000003d76d6: a7c80000           lhi     %r12,0
      	    00000000003d76da: a7f4ffc2           brc     15,3d765e
       Call Trace:
       ([<0000000000b6f000>] initcall_debug+0x0/0x4)
        [<0000000000989e8a>] cfq_init+0x62/0xd4
        [<00000000001000ba>] do_one_initcall+0x3a/0x170
        [<000000000096fb60>] kernel_init+0x214/0x2bc
        [<0000000000623202>] kernel_thread_starter+0x6/0xc
        [<00000000006231fc>] kernel_thread_starter+0x0/0xc
       no locks held by swapper/0/1.
       Last Breaking-Event-Address:
        [<00000000003d76c6>] blkcg_policy_register+0xc6/0xe0
       ---[ end trace b8ef4903fcbf9dd3 ]---
      
      This patch fixes the problem by ensuring all blkcg support code is
      inside CONFIG_CFQ_GROUP_IOSCHED.
      
      * blkcg_policy_cfq declaration and blkg_to_cfqg() definition are moved
        inside the first CONFIG_CFQ_GROUP_IOSCHED block.  __maybe_unused is
        dropped from blkcg_policy_cfq decl.
      
      * blkcg_deactivate_poilcy() invocation is moved inside ifdef.  This
        also makes the activation logic match cfq_init_queue().
      
      * All blkcg_policy_[un]register() invocations are moved inside ifdef.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Reported-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
      LKML-Reference: <20120601112954.GC3535@osiris.boeblingen.de.ibm.com>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      ffea73fc
    • Tejun Heo's avatar
      block: fix return value on cfq_init() failure · fd794956
      Tejun Heo authored
      cfq_init() would return zero after kmem cache creation failure.  Fix
      so that it returns -ENOMEM.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      fd794956
    • Sachin Kamat's avatar
      mtip32xx: Remove version.h header file inclusion · 87c9ea76
      Sachin Kamat authored
      version.h header file inclusion is no longer required.
      Signed-off-by: default avatarSachin Kamat <sachin.kamat@linaro.org>
      87c9ea76
    • Kukjin Kim's avatar
      gpio/samsung: fix the typo 'exynos5_xxx' instead of 'exonys5_xxx' · 5041caa4
      Kukjin Kim authored
      Should be 'exynos5_xxx' instead of 'exonys5_xxx'.
      
      It happened at the commit 30b84288 ("Merge tag 'soc2' of
      git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc")
      during v3.5 merge window.
      Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
      [ My bad  - Linus ]
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5041caa4
    • Linus Torvalds's avatar
      Merge branch 'pm-acpi' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 4d578573
      Linus Torvalds authored
      Pull some left-over PM patches from Rafael J. Wysocki.
      
      * 'pm-acpi' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        ACPI / PM: Make acpi_pm_device_sleep_state() follow the specification
        ACPI / PM: Make __acpi_bus_get_power() cover D3cold correctly
        ACPI / PM: Fix error messages in drivers/acpi/bus.c
        rtc-cmos / PM: report wakeup event on ACPI RTC alarm
        ACPI / PM: Generate wakeup events on fixed power button
      4d578573
    • Linus Torvalds's avatar
      Revert "mm: compaction: handle incorrect MIGRATE_UNMOVABLE type pageblocks" · 68e3e926
      Linus Torvalds authored
      This reverts commit 5ceb9ce6.
      
      That commit seems to be the cause of the mm compation list corruption
      issues that Dave Jones reported.  The locking (or rather, absense
      there-of) is dubious, as is the use of the 'page' variable once it has
      been found to be outside the pageblock range.
      
      So revert it for now, we can re-visit this for 3.6.  If we even need to:
      as Minchan Kim says, "The patch wasn't a bug fix and even test workload
      was very theoretical".
      Reported-and-tested-by: default avatarDave Jones <davej@redhat.com>
      Acked-by: default avatarHugh Dickins <hughd@google.com>
      Acked-by: default avatarKOSAKI Motohiro <kosaki.motohiro@gmail.com>
      Acked-by: default avatarMinchan Kim <minchan@kernel.org>
      Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
      Cc: Kyungmin Park <kyungmin.park@samsung.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      68e3e926
    • Hugh Dickins's avatar
      mm: fix warning in __set_page_dirty_nobuffers · 752dc185
      Hugh Dickins authored
      New tmpfs use of !PageUptodate pages for fallocate() is triggering the
      WARNING: at mm/page-writeback.c:1990 when __set_page_dirty_nobuffers()
      is called from migrate_page_copy() for compaction.
      
      It is anomalous that migration should use __set_page_dirty_nobuffers()
      on an address_space that does not participate in dirty and writeback
      accounting; and this has also been observed to insert surprising dirty
      tags into a tmpfs radix_tree, despite tmpfs not using tags at all.
      
      We should probably give migrate_page_copy() a better way to preserve the
      tag and migrate accounting info, when mapping_cap_account_dirty().  But
      that needs some more work: so in the interim, avoid the warning by using
      a simple SetPageDirty on PageSwapBacked pages.
      Reported-and-tested-by: default avatarDave Jones <davej@redhat.com>
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      752dc185
  6. 03 Jun, 2012 3 commits
    • Linus Torvalds's avatar
      vfs: move inode stat information closer together · 2f9d3df8
      Linus Torvalds authored
      The comment above it says "Stat data, not accessed from path walking",
      but in fact some of inode fields we use for the common stat data was way
      down at the end of the inode, causing unnecessary cache misses for the
      common stat operations.
      
      The inode structure is pretty big, and this can change padding depending
      on field width, but at least on the common 64-bit configurations this
      doesn't change the size.  Some of our inode layout has historically been
      to tro to avoid unnecessary padding fields, but cache locality is at
      least as important for layout, if not more.
      
      Noticed by looking at kernel profiles, and noticing that the "i_blkbits"
      access stood out like a sore thumb.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2f9d3df8
    • Linus Torvalds's avatar
      Linux 3.5-rc1 · f8f5701b
      Linus Torvalds authored
      f8f5701b
    • Linus Torvalds's avatar
      Merge tag 'dm-3.5-changes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm · 912afc36
      Linus Torvalds authored
      Pull device-mapper updates from Alasdair G Kergon:
       "Improve multipath's retrying mechanism in some defined circumstances
        and provide a simple reserve/release mechanism for userspace tools to
        access thin provisioning metadata while the pool is in use."
      
      * tag 'dm-3.5-changes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
        dm thin: provide userspace access to pool metadata
        dm thin: use slab mempools
        dm mpath: allow ioctls to trigger pg init
        dm mpath: delay retry of bypassed pg
        dm mpath: reduce size of struct multipath
      912afc36
  7. 02 Jun, 2012 18 commits