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  1. 27 May, 2016 8 commits
    • Junxiao Bi's avatar
      ocfs2: o2hb: add NEGO_TIMEOUT message · 34069b88
      Junxiao Bi authored 
      This message is sent to master node when non-master nodes's negotiate
timer expired.  Master node records these nodes in a bitmap which is
used to do write timeout timer re-queue decision.
Signed-off-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: default avatarRyan Ding <ryan.ding@oracle.com>
Reviewed-by: default avatarMark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      34069b88
    • Junxiao Bi's avatar
      ocfs2: o2hb: add negotiate timer · e0cbb798
      Junxiao Bi authored 
      This series of patches is to fix the issue that when storage down, all
nodes will fence self due to write timeout.

With this patch set, all nodes will keep going until storage back
online, except if the following issue happens, then all nodes will do as
before to fence self.

1. io error got
2. network between nodes down
3. nodes panic

This patch (of 6):

When storage down, all nodes will fence self due to write timeout.  The
negotiate timer is designed to avoid this, with it node will wait until
storage up again.

Negotiate timer working in the following way:

1. The timer expires before write timeout timer, its timeout is half
   of write timeout now.  It is re-queued along with write timeout timer.
   If expires, it will send NEGO_TIMEOUT message to master node(node with
   lowest node number).  This message does nothing but marks a bit in a
   bitmap recording which nodes are negotiating timeout on master node.

2. If storage down, nodes will send this message to master node, then
   when master node finds its bitmap including all online nodes, it sends
   NEGO_APPROVL message to all nodes one by one, this message will
   re-queue write timeout timer and negotiate timer.  For any node doesn't
   receive this message or meets some issue when handling this message, it
   will be fenced.  If storage up at any time, o2hb_thread will run and
   re-queue all the timer, nothing will be affected by these two steps.
Signed-off-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: default avatarRyan Ding <ryan.ding@oracle.com>
Reviewed-by: default avatarMark Fasheh <mfasheh@suse.de>
Cc: Gang He <ghe@suse.com>
Cc: rwxybh <rwxybh@126.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e0cbb798
    • Linus Torvalds's avatar
      Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild · dc03c0f9
      Linus Torvalds authored 
      Pull misc kbuild updates from Michal Marek:
 "This is the non-critical part of kbuild:

   - Coccinelle fixes, one semantic patch less in this round [Vaishali
     Thakkar, Wolfram Sang, Kees Cook]

   - rpm-pkg support for (open)SUSE's update-bootloader [Jiří Kosian]

   - rpm-pkg restored support for $RPMOPTS [Srinivas Pandruvada]

   - deb-pkg fixes for the linux-headers package [Bjørn Mork, Azriel
     Samson]"

* 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  coccicheck: Fix missing 0 index in kill loop
  scripts/package/Makefile: rpmbuild add support of RPMOPTS
  builddeb: fix missing headers in linux-headers package
  builddeb: include objtool binary in headers package
  kbuild/mkspec: support 'update-bootloader'-based systems
  scripts: coccinelle: remove check to move constants to right
  Coccinelle: setup_timer: Add space in front of parentheses
      dc03c0f9
    • Linus Torvalds's avatar
      Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild · f429d355
      Linus Torvalds authored 
      Pull kconfig update from Michal Marek:

 - fix for behavior of tristate choice items and fix for documentation
   of existing kconfig behavior [Dirk Gouders]

 - more helpful "unexpected data" kconfig warning [Paul Bolle]

* 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  kconfig/symbol.c: handle choice_values that depend on 'm' symbols
  kconfig-language: elaborate on the type of a choice
  kconfig-language: fix comment on dependency-generated menu structures.
  kconfig: add unexpected data itself to warning
      f429d355
    • Linus Torvalds's avatar
      Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild · 5b26fc88
      Linus Torvalds authored 
      Pull kbuild updates from Michal Marek:

 - new option CONFIG_TRIM_UNUSED_KSYMS which does a two-pass build and
   unexports symbols which are not used in the current config [Nicolas
   Pitre]

 - several kbuild rule cleanups [Masahiro Yamada]

 - warning option adjustments for gcov etc [Arnd Bergmann]

 - a few more small fixes

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (31 commits)
  kbuild: move -Wunused-const-variable to W=1 warning level
  kbuild: fix if_change and friends to consider argument order
  kbuild: fix adjust_autoksyms.sh for modules that need only one symbol
  kbuild: fix ksym_dep_filter when multiple EXPORT_SYMBOL() on the same line
  gcov: disable -Wmaybe-uninitialized warning
  gcov: disable tree-loop-im to reduce stack usage
  gcov: disable for COMPILE_TEST
  Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES
  Kbuild: change CC_OPTIMIZE_FOR_SIZE definition
  kbuild: forbid kernel directory to contain spaces and colons
  kbuild: adjust ksym_dep_filter for some cmd_* renames
  kbuild: Fix dependencies for final vmlinux link
  kbuild: better abstract vmlinux sequential prerequisites
  kbuild: fix call to adjust_autoksyms.sh when output directory specified
  kbuild: Get rid of KBUILD_STR
  kbuild: rename cmd_as_s_S to cmd_cpp_s_S
  kbuild: rename cmd_cc_i_c to cmd_cpp_i_c
  kbuild: drop redundant "PHONY += FORCE"
  kbuild: delete unnecessary "@:"
  kbuild: mark help target as PHONY
  ...
      5b26fc88
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · e12fab28
      Linus Torvalds authored 
      Merge fixes from Andrew Morton:
 "10 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  drivers/pinctrl/intel/pinctrl-baytrail.c: fix build with gcc-4.4
  update "mm/zsmalloc: don't fail if can't create debugfs info"
  dma-debug: avoid spinlock recursion when disabling dma-debug
  mm: oom_reaper: remove some bloat
  memcg: fix mem_cgroup_out_of_memory() return value.
  ocfs2: fix improper handling of return errno
  mm: slub: remove unused virt_to_obj()
  mm: kasan: remove unused 'reserved' field from struct kasan_alloc_meta
  mm: make CONFIG_DEFERRED_STRUCT_PAGE_INIT depends on !FLATMEM explicitly
  seqlock: fix raw_read_seqcount_latch()
      e12fab28
    • Linus Torvalds's avatar
      Merge tag 'dax-locking-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · 478a1469
      Linus Torvalds authored 
      Pull DAX locking updates from Ross Zwisler:
 "Filesystem DAX locking for 4.7

   - We use a bit in an exceptional radix tree entry as a lock bit and
     use it similarly to how page lock is used for normal faults.  This
     fixes races between hole instantiation and read faults of the same
     index.

   - Filesystem DAX PMD faults are disabled, and will be re-enabled when
     PMD locking is implemented"

* tag 'dax-locking-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  dax: Remove i_mmap_lock protection
  dax: Use radix tree entry lock to protect cow faults
  dax: New fault locking
  dax: Allow DAX code to replace exceptional entries
  dax: Define DAX lock bit for radix tree exceptional entry
  dax: Make huge page handling depend of CONFIG_BROKEN
  dax: Fix condition for filling of PMD holes
      478a1469
    • Linus Torvalds's avatar
      Merge tag 'dax-misc-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · 315227f6
      Linus Torvalds authored 
      Pull misc DAX updates from Vishal Verma:
 "DAX error handling for 4.7

   - Until now, dax has been disabled if media errors were found on any
     device.  This enables the use of DAX in the presence of these
     errors by making all sector-aligned zeroing go through the driver.

   - The driver (already) has the ability to clear errors on writes that
     are sent through the block layer using 'DSMs' defined in ACPI 6.1.

  Other misc changes:

   - When mounting DAX filesystems, check to make sure the partition is
     page aligned.  This is a requirement for DAX, and previously, we
     allowed such unaligned mounts to succeed, but subsequent
     reads/writes would fail.

   - Misc/cleanup fixes from Jan that remove unused code from DAX
     related to zeroing, writeback, and some size checks"

* tag 'dax-misc-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  dax: fix a comment in dax_zero_page_range and dax_truncate_page
  dax: for truncate/hole-punch, do zeroing through the driver if possible
  dax: export a low-level __dax_zero_page_range helper
  dax: use sb_issue_zerout instead of calling dax_clear_sectors
  dax: enable dax in the presence of known media errors (badblocks)
  dax: fallback from pmd to pte on error
  block: Update blkdev_dax_capable() for consistency
  xfs: Add alignment check for DAX mount
  ext2: Add alignment check for DAX mount
  ext4: Add alignment check for DAX mount
  block: Add bdev_dax_supported() for dax mount checks
  block: Add vfs_msg() interface
  dax: Remove redundant inode size checks
  dax: Remove pointless writeback from dax_do_io()
  dax: Remove zeroing from dax_io()
  dax: Remove dead zeroing code from fault handlers
  ext2: Avoid DAX zeroing to corrupt data
  ext2: Fix block zeroing in ext2_get_blocks() for DAX
  dax: Remove complete_unwritten argument
  DAX: move RADIX_DAX_ definitions to dax.c
      315227f6
  3. 26 May, 2016 24 commits
  5. 25 May, 2016 8 commits
    • Jann Horn's avatar
      Yama: fix double-spinlock and user access in atomic context · dca6b414
      Jann Horn authored 
      Commit 8a56038c ("Yama: consolidate error reporting") causes lockups
when someone hits a Yama denial. Call chain:

process_vm_readv -> process_vm_rw -> process_vm_rw_core -> mm_access
-> ptrace_may_access
task_lock(...) is taken
__ptrace_may_access -> security_ptrace_access_check
-> yama_ptrace_access_check -> report_access -> kstrdup_quotable_cmdline
-> get_cmdline -> access_process_vm -> get_task_mm
task_lock(...) is taken again

task_lock(p) just calls spin_lock(&p->alloc_lock), so at this point,
spin_lock() is called on a lock that is already held by the current
process.

Also: Since the alloc_lock is a spinlock, sleeping inside
security_ptrace_access_check hooks is probably not allowed at all? So it's
not even possible to print the cmdline from in there because that might
involve paging in userspace memory.

It would be tempting to rewrite ptrace_may_access() to drop the alloc_lock
before calling the LSM, but even then, ptrace_may_access() itself might be
called from various contexts in which you're not allowed to sleep; for
example, as far as I understand, to be able to hold a reference to another
task, usually an RCU read lock will be taken (see e.g. kcmp() and
get_robust_list()), so that also prohibits sleeping. (And using e.g. FUSE,
a user can cause pagefault handling to take arbitrary amounts of time -
see https://bugs.chromium.org/p/project-zero/issues/detail?id=808.)

Therefore, AFAIK, in order to print the name of a process below
security_ptrace_access_check(), you'd have to either grab a reference to
the mm_struct and defer the access violation reporting or just use the
"comm" value that's stored in kernelspace and accessible without big
complications. (Or you could try to use some kind of atomic remote VM
access that fails if the memory isn't paged in, similar to
copy_from_user_inatomic(), and if necessary fall back to comm, but
that'd be kind of ugly because the comm/cmdline choice would look
pretty random to the user.)

Fix it by deferring reporting of the access violation until current
exits kernelspace the next time.

v2: Don't oops on PTRACE_TRACEME, call report_access under
task_lock(current). Also fix nonsensical comment. And don't use
GPF_ATOMIC for memory allocation with no locks held.
This patch is tested both for ptrace attach and ptrace traceme.

Fixes: 8a56038c ("Yama: consolidate error reporting")
Signed-off-by: default avatarJann Horn <jann@thejh.net>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      dca6b414
    • Linus Torvalds's avatar
      Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · c4a34600
      Linus Torvalds authored 
      Pull objtool build fix from Ingo Molnar:
 "An libtool fix for older libelf versions"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Allow building with older libelf
      c4a34600
    • Yan, Zheng's avatar
      ceph: fix wake_up_session_cb() · e5360309
      Yan, Zheng authored 
      We should reset i_requested_max_size before waking the waiters.
(zero i_requested_max_size make waiter re-request the max size)
Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
      e5360309
    • Yan, Zheng's avatar
      ceph: don't use truncate_pagecache() to invalidate read cache · 9abd4db7
      Yan, Zheng authored 
      truncate_pagecache() drops dirty pages, it's dangerous to use it
to invalidate read cache. Besides, we shouldn't start invalidating
read cache while there are buffer writers. Because buffer writers
may add dirty pages later.
Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
      9abd4db7
    • Yan, Zheng's avatar
      ceph: SetPageError() for writeback pages if writepages fails · b109eec6
      Yan, Zheng authored 
      Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
      b109eec6
    • Yan, Zheng's avatar
      ceph: handle interrupted ceph_writepage() · ad15ec06
      Yan, Zheng authored 
      writepage() can be interrupted when it's called by direct memory
reclaimer (the direct memory relaimer is killed). To avoid lossing
data, we redirty the page.
Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
      ad15ec06
    • Yan, Zheng's avatar
      ceph: make ceph_update_writeable_page() uninterruptible · a78bbd4b
      Yan, Zheng authored 
      ceph_update_writeable_page() is used by ceph_write_begin(). It beaks
atomicity of write operation if it's interruptible.
Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
      a78bbd4b
    • Yan, Zheng's avatar
      libceph: make ceph_osdc_wait_request() uninterruptible · 0e76abf2
      Yan, Zheng authored 
      Ceph_osdc_wait_request() is used when cephfs issues sync IO. In most
cases, the sync IO should be uninterruptible. The fix is use killale
wait function in ceph_osdc_wait_request().
Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
      0e76abf2
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