1. 22 May, 2015 1 commit
    • Mike Snitzer's avatar
      block: remove management of bi_remaining when restoring original bi_end_io · 326e1dbb
      Mike Snitzer authored
      Commit c4cf5261 ("bio: skip atomic inc/dec of ->bi_remaining for
      non-chains") regressed all existing callers that followed this pattern:
       1) saving a bio's original bi_end_io
       2) wiring up an intermediate bi_end_io
       3) restoring the original bi_end_io from intermediate bi_end_io
       4) calling bio_endio() to execute the restored original bi_end_io
      The regression was due to BIO_CHAIN only ever getting set if
      bio_inc_remaining() is called.  For the above pattern it isn't set until
      step 3 above (step 2 would've needed to establish BIO_CHAIN).  As such
      the first bio_endio(), in step 2 above, never decremented __bi_remaining
      before calling the intermediate bi_end_io -- leaving __bi_remaining with
      the value 1 instead of 0.  When bio_inc_remaining() occurred during step
      3 it brought it to a value of 2.  When the second bio_endio() was
      called, in step 4 above, it should've called the original bi_end_io but
      it didn't because there was an extra reference that wasn't dropped (due
      to atomic operations being optimized away since BIO_CHAIN wasn't set
      Fix this issue by removing the __bi_remaining management complexity for
      all callers that use the above pattern -- bio_chain() is the only
      interface that _needs_ to be concerned with __bi_remaining.  For the
      above pattern callers just expect the bi_end_io they set to get called!
      Remove bio_endio_nodec() and also remove all bio_inc_remaining() calls
      that aren't associated with the bio_chain() interface.
      Also, the bio_inc_remaining() interface has been moved local to bio.c.
      Fixes: c4cf5261
       ("bio: skip atomic inc/dec of ->bi_remaining for non-chains")
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
  2. 20 May, 2015 2 commits
    • Ming Lei's avatar
      block: replace trylock with mutex_lock in blkdev_reread_part() · b04a5636
      Ming Lei authored
      The only possible problem of using mutex_lock() instead of trylock
      is about deadlock.
      If there aren't any locks held before calling blkdev_reread_part(),
      deadlock can't be caused by this conversion.
      If there are locks held before calling blkdev_reread_part(),
      and if these locks arn't required in open, close handler and I/O
      path, deadlock shouldn't be caused too.
      Both user space's ioctl(BLKRRPART) and md_setup_drive() from
      init/do_mounts_md.c belongs to the 1st case, so the conversion is safe
      for the two cases.
      For loop, the previous patches in this pathset has fixed the ABBA lock
      dependency, so the conversion is OK.
      For nbd, tx_lock is held when calling the function:
      	- both open and release won't hold the lock
      	- when blkdev_reread_part() is run, I/O thread has been stopped
      	already, so tx_lock won't be acquired in I/O path at that time.
      	- so the conversion won't cause deadlock for nbd
      For dasd, both dasd_open(), dasd_release() and request function don't
      acquire any mutex/semphone, so the conversion should be safe.
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Tested-by: default avatarJarod Wilson <jarod@redhat.com>
      Acked-by: default avatarJarod Wilson <jarod@redhat.com>
      Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    • Jarod Wilson's avatar
      block: export blkdev_reread_part() and __blkdev_reread_part() · be324177
      Jarod Wilson authored
      This patch exports blkdev_reread_part() for block drivers, also
      introduce __blkdev_reread_part().
      For some drivers, such as loop, reread of partitions can be run
      from the release path, and bd_mutex may already be held prior to
      calling ioctl_by_bdev(bdev, BLKRRPART, 0), so introduce
      __blkdev_reread_part for use in such cases.
      CC: Christoph Hellwig <hch@lst.de>
      CC: Jens Axboe <axboe@kernel.dk>
      CC: Tejun Heo <tj@kernel.org>
      CC: Alexander Viro <viro@zeniv.linux.org.uk>
      CC: Markus Pargmann <mpa@pengutronix.de>
      CC: Stefan Weinhuber <wein@de.ibm.com>
      CC: Stefan Haberland <stefan.haberland@de.ibm.com>
      CC: Sebastian Ott <sebott@linux.vnet.ibm.com>
      CC: Fabian Frederick <fabf@skynet.be>
      CC: Ming Lei <ming.lei@canonical.com>
      CC: David Herrmann <dh.herrmann@gmail.com>
      CC: Andrew Morton <akpm@linux-foundation.org>
      CC: Peter Zijlstra <peterz@infradead.org>
      CC: nbd-general@lists.sourceforge.net
      CC: linux-s390@vger.kernel.org
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJarod Wilson <jarod@redhat.com>
      Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
  3. 19 May, 2015 5 commits
  4. 08 May, 2015 6 commits
    • Shaohua Li's avatar
      blk-mq: make plug work for mutiple disks and queues · 5b3f341f
      Shaohua Li authored
      Last patch makes plug work for multiple queue case. However it only
      works for single disk case, because it assumes only one request in the
      plug list. If a task is accessing multiple disks, eg MD/DM, the
      assumption is wrong. Let blk_attempt_plug_merge() record request from
      the same queue.
      V2: use NULL parameter in !mq case. Fix a bug. Add comments in
      blk_attempt_plug_merge to make it less (hopefully) confusion.
      Cc: Jens Axboe <axboe@fb.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarShaohua Li <shli@fb.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    • Shaohua Li's avatar
      blk-mq: do limited block plug for multiple queue case · f984df1f
      Shaohua Li authored
      plug is still helpful for workload with IO merge, but it can be harmful
      otherwise especially with multiple hardware queues, as there is
      (supposed) no lock contention in this case and plug can introduce
      latency. For multiple queues, we do limited plug, eg plug only if there
      is request merge. If a request doesn't have merge with following
      request, the requet will be dispatched immediately.
      V2: check blk_queue_nomerges() as suggested by Jeff.
      Cc: Jens Axboe <axboe@fb.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarShaohua Li <shli@fb.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    • Shaohua Li's avatar
      blk-mq: avoid re-initialize request which is failed in direct dispatch · 239ad215
      Shaohua Li authored
      If we directly issue a request and it fails, we use
      blk_mq_merge_queue_io(). But we already assigned bio to a request in
      blk_mq_bio_to_request. blk_mq_merge_queue_io shouldn't run
      blk_mq_bio_to_request again.
      Signed-off-by: default avatarShaohua Li <shli@fb.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    • Jeff Moyer's avatar
      blk-mq: fix plugging in blk_sq_make_request · e6c4438b
      Jeff Moyer authored
      The following appears in blk_sq_make_request:
      	 * If we have multiple hardware queues, just go directly to
      	 * one of those for sync IO.
      We clearly don't have multiple hardware queues, here!  This comment was
      introduced with this commit 07068d5b
       (blk-mq: split make request
      handler for multi and single queue):
          We want slightly different behavior from them:
          - On single queue devices, we currently use the per-process plug
            for deferred IO and for merging.
          - On multi queue devices, we don't use the per-process plug, but
            we want to go straight to hardware for SYNC IO.
      The old code had this:
              use_plug = !is_flush_fua && ((q->nr_hw_queues == 1) || !is_sync);
      and that was converted to:
      	use_plug = !is_flush_fua && !is_sync;
      which is not equivalent.  For the single queue case, that second half of
      the && expression is always true.  So, what I think was actually inteded
      follows (and this more closely matches what is done in blk_queue_bio).
      V2: delete the 'likely', which should not be a big deal
      Signed-off-by: default avatarJeff Moyer <jmoyer@redhat.com>
      Signed-off-by: default avatarShaohua Li <shli@fb.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    • Shaohua Li's avatar
      sched: always use blk_schedule_flush_plug in io_schedule_out · 5596d0d5
      Shaohua Li authored
      block plug callback could sleep, so we introduce a parameter
      'from_schedule' and corresponding drivers can use it to destinguish a
      schedule plug flush or a plug finish. Unfortunately io_schedule_out
      still uses blk_flush_plug(). This causes below output (Note, I added a
      might_sleep() in raid1_unplug to make it trigger faster, but the whole
      thing doesn't matter if I add might_sleep). In raid1/10, this can cause
      This patch makes io_schedule_out always uses blk_schedule_flush_plug.
      This should only impact drivers (as far as I know, raid 1/10) which are
      sensitive to the 'from_schedule' parameter.
      [  370.817949] ------------[ cut here ]------------
      [  370.817960] WARNING: CPU: 7 PID: 145 at ../kernel/sched/core.c:7306 __might_sleep+0x7f/0x90()
      [  370.817969] do not call blocking ops when !TASK_RUNNING; state=2 set at [<ffffffff81092fcf>] prepare_to_wait+0x2f/0x90
      [  370.817971] Modules linked in: raid1
      [  370.817976] CPU: 7 PID: 145 Comm: kworker/u16:9 Tainted: G        W       4.0.0+ #361
      [  370.817977] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140709_153802- 04/01/2014
      [  370.817983] Workqueue: writeback bdi_writeback_workfn (flush-9:1)
      [  370.817985]  ffffffff81cd83be ffff8800ba8cb298 ffffffff819dd7af 0000000000000001
      [  370.817988]  ffff8800ba8cb2e8 ffff8800ba8cb2d8 ffffffff81051afc ffff8800ba8cb2c8
      [  370.817990]  ffffffffa00061a8 000000000000041e 0000000000000000 ffff8800ba8cba28
      [  370.817993] Call Trace:
      [  370.817999]  [<ffffffff819dd7af>] dump_stack+0x4f/0x7b
      [  370.818002]  [<ffffffff81051afc>] warn_slowpath_common+0x8c/0xd0
      [  370.818004]  [<ffffffff81051b86>] warn_slowpath_fmt+0x46/0x50
      [  370.818006]  [<ffffffff81092fcf>] ? prepare_to_wait+0x2f/0x90
      [  370.818008]  [<ffffffff81092fcf>] ? prepare_to_wait+0x2f/0x90
      [  370.818010]  [<ffffffff810776ef>] __might_sleep+0x7f/0x90
      [  370.818014]  [<ffffffffa0000c03>] raid1_unplug+0xd3/0x170 [raid1]
      [  370.818024]  [<ffffffff81421d9a>] blk_flush_plug_list+0x8a/0x1e0
      [  370.818028]  [<ffffffff819e3550>] ? bit_wait+0x50/0x50
      [  370.818031]  [<ffffffff819e21b0>] io_schedule_timeout+0x130/0x140
      [  370.818033]  [<ffffffff819e3586>] bit_wait_io+0x36/0x50
      [  370.818034]  [<ffffffff819e31b5>] __wait_on_bit+0x65/0x90
      [  370.818041]  [<ffffffff8125b67c>] ? ext4_read_block_bitmap_nowait+0xbc/0x630
      [  370.818043]  [<ffffffff819e3550>] ? bit_wait+0x50/0x50
      [  370.818045]  [<ffffffff819e3302>] out_of_line_wait_on_bit+0x72/0x80
      [  370.818047]  [<ffffffff810935e0>] ? autoremove_wake_function+0x40/0x40
      [  370.818050]  [<ffffffff811de744>] __wait_on_buffer+0x44/0x50
      [  370.818053]  [<ffffffff8125ae80>] ext4_wait_block_bitmap+0xe0/0xf0
      [  370.818058]  [<ffffffff812975d6>] ext4_mb_init_cache+0x206/0x790
      [  370.818062]  [<ffffffff8114bc6c>] ? lru_cache_add+0x1c/0x50
      [  370.818064]  [<ffffffff81297c7e>] ext4_mb_init_group+0x11e/0x200
      [  370.818066]  [<ffffffff81298231>] ext4_mb_load_buddy+0x341/0x360
      [  370.818068]  [<ffffffff8129a1a3>] ext4_mb_find_by_goal+0x93/0x2f0
      [  370.818070]  [<ffffffff81295b54>] ? ext4_mb_normalize_request+0x1e4/0x5b0
      [  370.818072]  [<ffffffff8129ab67>] ext4_mb_regular_allocator+0x67/0x460
      [  370.818074]  [<ffffffff81295b54>] ? ext4_mb_normalize_request+0x1e4/0x5b0
      [  370.818076]  [<ffffffff8129ca4b>] ext4_mb_new_blocks+0x4cb/0x620
      [  370.818079]  [<ffffffff81290956>] ext4_ext_map_blocks+0x4c6/0x14d0
      [  370.818081]  [<ffffffff812a4d4e>] ? ext4_es_lookup_extent+0x4e/0x290
      [  370.818085]  [<ffffffff8126399d>] ext4_map_blocks+0x14d/0x4f0
      [  370.818088]  [<ffffffff81266fbd>] ext4_writepages+0x76d/0xe50
      [  370.818094]  [<ffffffff81149691>] do_writepages+0x21/0x50
      [  370.818097]  [<ffffffff811d5c00>] __writeback_single_inode+0x60/0x490
      [  370.818099]  [<ffffffff811d630a>] writeback_sb_inodes+0x2da/0x590
      [  370.818103]  [<ffffffff811abf4b>] ? trylock_super+0x1b/0x50
      [  370.818105]  [<ffffffff811abf4b>] ? trylock_super+0x1b/0x50
      [  370.818107]  [<ffffffff811d665f>] __writeback_inodes_wb+0x9f/0xd0
      [  370.818109]  [<ffffffff811d69db>] wb_writeback+0x34b/0x3c0
      [  370.818111]  [<ffffffff811d70df>] bdi_writeback_workfn+0x23f/0x550
      [  370.818116]  [<ffffffff8106bbd8>] process_one_work+0x1c8/0x570
      [  370.818117]  [<ffffffff8106bb5b>] ? process_one_work+0x14b/0x570
      [  370.818119]  [<ffffffff8106c09b>] worker_thread+0x11b/0x470
      [  370.818121]  [<ffffffff8106bf80>] ? process_one_work+0x570/0x570
      [  370.818124]  [<ffffffff81071868>] kthread+0xf8/0x110
      [  370.818126]  [<ffffffff81071770>] ? kthread_create_on_node+0x210/0x210
      [  370.818129]  [<ffffffff819e9322>] ret_from_fork+0x42/0x70
      [  370.818131]  [<ffffffff81071770>] ? kthread_create_on_node+0x210/0x210
      [  370.818132] ---[ end trace 7b4deb71e68b6605 ]---
      V2: don't change ->in_iowait
      Cc: NeilBrown <neilb@suse.de>
      Signed-off-by: default avatarShaohua Li <shli@fb.com>
      Reviewed-by: default avatarJeff Moyer <jmoyer@redhat.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    • Shaohua Li's avatar
      blk: clean up plug · dd6cf3e1
      Shaohua Li authored
      Current code looks like inner plug gets flushed with a
      blk_finish_plug(). Actually it's a nop. All requests/callbacks are added
      to current->plug, while only outmost plug is assigned to current->plug.
      So inner plug always has empty request/callback list, which makes
      blk_flush_plug_list() a nop. This tries to make the code more clear.
      Signed-off-by: default avatarShaohua Li <shli@fb.com>
      Reviewed-by: default avatarJeff Moyer <jmoyer@redhat.com>
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
  5. 05 May, 2015 10 commits
  6. 04 May, 2015 5 commits
    • Álvaro Fernández Rojas's avatar
      hwrng: bcm63xx - Fix driver compilation · f440c4ee
      Álvaro Fernández Rojas authored
      - s/clk_didsable_unprepare/clk_disable_unprepare
      - s/prov/priv
      - s/error/ret (bcm63xx_rng_probe)
      Fixes: 6229c160
       ("hwrng: bcm63xx - make use of devm_hwrng_register")
      Signed-off-by: default avatarÁlvaro Fernández Rojas <noltari@gmail.com>
      Acked-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    • Daniel Borkmann's avatar
      lib: make memzero_explicit more robust against dead store elimination · 7829fb09
      Daniel Borkmann authored
      In commit 0b053c95 ("lib: memzero_explicit: use barrier instead
      of OPTIMIZER_HIDE_VAR"), we made memzero_explicit() more robust in
      case LTO would decide to inline memzero_explicit() and eventually
      find out it could be elimiated as dead store.
      While using barrier() works well for the case of gcc, recent efforts
      from LLVMLinux people suggest to use llvm as an alternative to gcc,
      and there, Stephan found in a simple stand-alone user space example
      that llvm could nevertheless optimize and thus elimitate the memset().
      A similar issue has been observed in the referenced llvm bug report,
      which is regarded as not-a-bug.
      Based on some experiments, icc is a bit special on its own, while it
      doesn't seem to eliminate the memset(), it could do so with an own
      implementation, and then result in similar findings as with llvm.
      The fix in this patch now works for all three compilers (also tested
      with more aggressive optimization levels). Arguably, in the current
      kernel tree it's more of a theoretical issue, but imho, it's better
      to be pedantic about it.
      It's clearly visible with gcc/llvm though, with the below code: if we
      would have used barrier() only here, llvm would have omitted clearing,
      not so with barrier_data() variant:
        static inline void memzero_explicit(void *s, size_t count)
          memset(s, 0, count);
        int main(void)
          char buff[20];
          memzero_explicit(buff, sizeof(buff));
          return 0;
        $ gcc -O2 test.c
        $ gdb a.out
        (gdb) disassemble main
        Dump of assembler code for function main:
         0x0000000000400400  <+0>: lea   -0x28(%rsp),%rax
         0x0000000000400405  <+5>: movq  $0x0,-0x28(%rsp)
         0x000000000040040e <+14>: movq  $0x0,-0x20(%rsp)
         0x0000000000400417 <+23>: movl  $0x0,-0x18(%rsp)
         0x000000000040041f <+31>: xor   %eax,%eax
         0x0000000000400421 <+33>: retq
        End of assembler dump.
        $ clang -O2 test.c
        $ gdb a.out
        (gdb) disassemble main
        Dump of assembler code for function main:
         0x00000000004004f0  <+0>: xorps  %xmm0,%xmm0
         0x00000000004004f3  <+3>: movaps %xmm0,-0x18(%rsp)
         0x00000000004004f8  <+8>: movl   $0x0,-0x8(%rsp)
         0x0000000000400500 <+16>: lea    -0x18(%rsp),%rax
         0x0000000000400505 <+21>: xor    %eax,%eax
         0x0000000000400507 <+23>: retq
        End of assembler dump.
      As gcc, clang, but also icc defines __GNUC__, it's sufficient to define
      this in compiler-gcc.h only to be picked up. For a fallback or otherwise
      unsupported compiler, we define it as a barrier. Similarly, for ecc which
      does not support gcc inline asm.
      Reference: https://llvm.org/bugs/show_bug.cgi?id=15495
      Reported-by: default avatarStephan Mueller <smueller@chronox.de>
      Tested-by: default avatarStephan Mueller <smueller@chronox.de>
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Cc: Stephan Mueller <smueller@chronox.de>
      Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
      Cc: mancha security <mancha1@zoho.com>
      Cc: Mark Charlebois <charlebm@gmail.com>
      Cc: Behan Webster <behanw@converseincode.com>
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    • Linus Torvalds's avatar
      Linux 4.1-rc2 · 5ebe6afa
      Linus Torvalds authored
    • Linus Torvalds's avatar
      Merge tag 'for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · 8663da2c
      Linus Torvalds authored
      Pull ext4 fixes from Ted Ts'o:
       "Some miscellaneous bug fixes and some final on-disk and ABI changes
        for ext4 encryption which provide better security and performance"
      * tag 'for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
        ext4: fix growing of tiny filesystems
        ext4: move check under lock scope to close a race.
        ext4: fix data corruption caused by unwritten and delayed extents
        ext4 crypto: remove duplicated encryption mode definitions
        ext4 crypto: do not select from EXT4_FS_ENCRYPTION
        ext4 crypto: add padding to filenames before encrypting
        ext4 crypto: simplify and speed up filename encryption
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · 101a6fd3
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "One intel fix, one rockchip fix, and a bunch of radeon fixes for some
        regressions from audio rework and vm stability"
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
        drm/i915/chv: Implement WaDisableShadowRegForCpd
        drm/radeon: fix userptr return value checking (v2)
        drm/radeon: check new address before removing old one
        drm/radeon: reset BOs address after clearing it.
        drm/radeon: fix lockup when BOs aren't part of the VM on release
        drm/radeon: add SI DPM quirk for Sapphire R9 270 Dual-X 2G GDDR5
        drm/radeon: adjust pll when audio is not enabled
        drm/radeon: only enable audio streams if the monitor supports it
        drm/radeon: only mark audio as connected if the monitor supports it (v3)
        drm/radeon/audio: don't enable packets until the end
        drm/radeon: drop dce6_dp_enable
        drm/radeon: fix ordering of AVI packet setup
        drm/radeon: Use drm_calloc_ab for CS relocs
        drm/rockchip: fix error check when getting irq
        MAINTAINERS: add entry for Rockchip drm drivers
  7. 03 May, 2015 8 commits
    • Dave Airlie's avatar
      Merge tag 'drm-intel-fixes-2015-04-30' of git://anongit.freedesktop.org/drm-intel into drm-fixes · 71aee819
      Dave Airlie authored
      Just a single intel fix
      * tag 'drm-intel-fixes-2015-04-30' of git://anongit.freedesktop.org/drm-intel:
        drm/i915/chv: Implement WaDisableShadowRegForCpd
    • Dave Airlie's avatar
      Merge branch 'drm-next0420' of https://github.com/markyzq/kernel-drm-rockchip into drm-fixes · df9ebeb2
      Dave Airlie authored
      one fix and maintainers update
      * 'drm-next0420' of https://github.com/markyzq/kernel-drm-rockchip:
        drm/rockchip: fix error check when getting irq
        MAINTAINERS: add entry for Rockchip drm drivers
    • Linus Torvalds's avatar
      Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · 61f06db0
      Linus Torvalds authored
      Pull SCSI fixes from James Bottomley:
       "This is three logical fixes (as 5 patches).
        The 3ware class of drivers were causing an oops with multiqueue by
        tearing down the command mappings after completing the command (where
        the variables in the command used to tear down the mapping were
        no-longer valid).  There's also a fix for the qnap iscsi target which
        was choking on us sending it commands that were too long and a fix for
        the reworked aha1542 allocating GFP_KERNEL under a lock"
      * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
        3w-9xxx: fix command completion race
        3w-xxxx: fix command completion race
        3w-sas: fix command completion race
        aha1542: Allocate memory before taking a lock
        SCSI: add 1024 max sectors black list flag
    • Linus Torvalds's avatar
      Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma · 33332224
      Linus Torvalds authored
      Pull slave dmaengine fixes from Vinod Koul:
       "Here are the fixes in dmaengine subsystem for rc2:
         - privatecnt fix for slave dma request API by Christopher
         - warn fix for PM ifdef in usb-dmac by Geert
         - fix hardware dependency for xgene by Jean"
      * 'next' of git://git.infradead.org/users/vkoul/slave-dma:
        dmaengine: increment privatecnt when using dma_get_any_slave_channel
        dmaengine: xgene: Set hardware dependency
        dmaengine: usb-dmac: Protect PM-only functions to kill warning
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux · 180d89f6
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       - build fix for SMP=n in book3s_xics.c
       - fix for Daniel's pci_controller_ops on powernv.
       - revert the TM syscall abort patch for now.
       - CPU affinity fix from Nathan.
       - two EEH fixes from Gavin.
       - fix for CR corruption from Sam.
       - selftest build fix.
      * tag 'powerpc-4.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
        powerpc/powernv: Restore non-volatile CRs after nap
        powerpc/eeh: Delay probing EEH device during hotplug
        powerpc/eeh: Fix race condition in pcibios_set_pcie_reset_state()
        powerpc/pseries: Correct cpu affinity for dlpar added cpus
        selftests/powerpc: Fix the pmu install rule
        Revert "powerpc/tm: Abort syscalls in active transactions"
        powerpc/powernv: Fix early pci_controller_ops loading.
        powerpc/kvm: Fix SMP=n build error in book3s_xics.c
    • Jan Kara's avatar
      ext4: fix growing of tiny filesystems · 2c869b26
      Jan Kara authored
      The estimate of necessary transaction credits in ext4_flex_group_add()
      is too pessimistic. It reserves credit for sb, resize inode, and resize
      inode dindirect block for each group added in a flex group although they
      are always the same block and thus it is enough to account them only
      once. Also the number of modified GDT block is overestimated since we
      fit EXT4_DESC_PER_BLOCK(sb) descriptors in one block.
      Make the estimation more precise. That reduces number of requested
      credits enough that we can grow 20 MB filesystem (which has 1 MB
      journal, 79 reserved GDT blocks, and flex group size 16 by default).
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarEric Sandeen <sandeen@redhat.com>
    • Davide Italiano's avatar
      ext4: move check under lock scope to close a race. · 280227a7
      Davide Italiano authored
      fallocate() checks that the file is extent-based and returns
      EOPNOTSUPP in case is not. Other tasks can convert from and to
      indirect and extent so it's safe to check only after grabbing
      the inode mutex.
      Signed-off-by: default avatarDavide Italiano <dccitaliano@gmail.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@vger.kernel.org
    • Lukas Czerner's avatar
      ext4: fix data corruption caused by unwritten and delayed extents · d2dc317d
      Lukas Czerner authored
      Currently it is possible to lose whole file system block worth of data
      when we hit the specific interaction with unwritten and delayed extents
      in status extent tree.
      The problem is that when we insert delayed extent into extent status
      tree the only way to get rid of it is when we write out delayed buffer.
      However there is a limitation in the extent status tree implementation
      so that when inserting unwritten extent should there be even a single
      delayed block the whole unwritten extent would be marked as delayed.
      At this point, there is no way to get rid of the delayed extents,
      because there are no delayed buffers to write out. So when a we write
      into said unwritten extent we will convert it to written, but it still
      remains delayed.
      When we try to write into that block later ext4_da_map_blocks() will set
      the buffer new and delayed and map it to invalid block which causes
      the rest of the block to be zeroed loosing already written data.
      For now we can fix this by simply not allowing to set delayed status on
      written extent in the extent status tree. Also add WARN_ON() to make
      sure that we notice if this happens in the future.
      This problem can be easily reproduced by running the following xfs_io.
      xfs_io -f -c "pwrite -S 0xaa 4096 2048" \
                -c "falloc 0 131072" \
                -c "pwrite -S 0xbb 65536 2048" \
                -c "fsync" /mnt/test/fff
      echo 3 > /proc/sys/vm/drop_caches
      xfs_io -c "pwrite -S 0xdd 67584 2048" /mnt/test/fff
      This can be theoretically also reproduced by at random by running fsx,
      but it's not very reliable, though on machines with bigger page size
      (like ppc) this can be seen more often (especially xfstest generic/127)
      Signed-off-by: default avatarLukas Czerner <lczerner@redhat.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@vger.kernel.org
  8. 02 May, 2015 3 commits
    • Chanho Park's avatar
      ext4 crypto: remove duplicated encryption mode definitions · 9402bdca
      Chanho Park authored
      This patch removes duplicated encryption modes which were already in
      ext4.h. They were duplicated from commit 3edc18d8
       and commit f542fb.
      Cc: Theodore Ts'o <tytso@mit.edu>
      Cc: Michael Halcrow <mhalcrow@google.com>
      Cc: Andreas Dilger <adilger.kernel@dilger.ca>
      Signed-off-by: default avatarChanho Park <chanho61.park@samsung.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    • Herbert Xu's avatar
      ext4 crypto: do not select from EXT4_FS_ENCRYPTION · fb63e548
      Herbert Xu authored
      This patch adds a tristate EXT4_ENCRYPTION to do the selections
      for EXT4_FS_ENCRYPTION because selecting from a bool causes all
      the selected options to be built-in, even if EXT4 itself is a
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 6c3c1eb3
      Linus Torvalds authored
      Pull networking fixes from David Miller:
       1) Receive packet length needs to be adjust by 2 on RX to accomodate
          the two padding bytes in altera_tse driver.  From Vlastimil Setka.
       2) If rx frame is dropped due to out of memory in macb driver, we leave
          the receive ring descriptors in an undefined state.  From Punnaiah
          Choudary Kalluri
       3) Some netlink subsystems erroneously signal NLM_F_MULTI.  That is
          only for dumps.  Fix from Nicolas Dichtel.
       4) Fix mis-use of raw rt->rt_pmtu value in ipv4, one must always go via
          the ipv4_mtu() helper.  From Herbert Xu.
       5) Fix null deref in bridge netfilter, and miscalculated lengths in
          jump/goto nf_tables verdicts.  From Florian Westphal.
       6) Unhash ping sockets properly.
       7) Software implementation of BPF divide did 64/32 rather than 64/64
          bit divide.  The JITs got it right.  Fix from Alexei Starovoitov.
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (30 commits)
        ipv4: Missing sk_nulls_node_init() in ping_unhash().
        net: fec: Fix RGMII-ID mode
        net/mlx4_en: Schedule napi when RX buffers allocation fails
        netxen_nic: use spin_[un]lock_bh around tx_clean_lock
        net/mlx4_core: Fix unaligned accesses
        mlx4_en: Use correct loop cursor in error path.
        cxgb4: Fix MC1 memory offset calculation
        bnx2x: Delay during kdump load
        net: Fix Kernel Panic in bonding driver debugfs file: rlb_hash_table
        net: dsa: Fix scope of eeprom-length property
        net: macb: Fix race condition in driver when Rx frame is dropped
        hv_netvsc: Fix a bug in netvsc_start_xmit()
        altera_tse: Correct rx packet length
        mlx4: Fix tx ring affinity_mask creation
        tipc: fix problem with parallel link synchronization mechanism
        tipc: remove wrong use of NLM_F_MULTI
        bridge/nl: remove wrong use of NLM_F_MULTI
        bridge/mdb: remove wrong use of NLM_F_MULTI
        net: sched: act_connmark: don't zap skb->nfct
        trivial: net: systemport: bcmsysport.h: fix 0x0x prefix