Commit Graph

42020 Commits

Author SHA1 Message Date
Linus Torvalds ea1ee5ff1b Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block layer fixes from Jens Axboe:
 "A final set of fixes for 4.3.

  It is (again) bigger than I would have liked, but it's all been
  through the testing mill and has been carefully reviewed by multiple
  parties.  Each fix is either a regression fix for this cycle, or is
  marked stable.  You can scold me at KS.  The pull request contains:

   - Three simple fixes for NVMe, fixing regressions since 4.3.  From
     Arnd, Christoph, and Keith.

   - A single xen-blkfront fix from Cathy, fixing a NULL dereference if
     an error is returned through the staste change callback.

   - Fixup for some bad/sloppy code in nbd that got introduced earlier
     in this cycle.  From Markus Pargmann.

   - A blk-mq tagset use-after-free fix from Junichi.

   - A backing device lifetime fix from Tejun, fixing a crash.

   - And finally, a set of regression/stable fixes for cgroup writeback
     from Tejun"

* 'for-linus' of git://git.kernel.dk/linux-block:
  writeback: remove broken rbtree_postorder_for_each_entry_safe() usage in cgwb_bdi_destroy()
  NVMe: Fix memory leak on retried commands
  block: don't release bdi while request_queue has live references
  nvme: use an integer value to Linux errno values
  blk-mq: fix use-after-free in blk_mq_free_tag_set()
  nvme: fix 32-bit build warning
  writeback: fix incorrect calculation of available memory for memcg domains
  writeback: memcg dirty_throttle_control should be initialized with wb->memcg_completions
  writeback: bdi_writeback iteration must not skip dying ones
  writeback: fix bdi_writeback iteration in wakeup_dirtytime_writeback()
  writeback: laptop_mode_timer_fn() needs rcu_read_lock() around bdi_writeback iteration
  nbd: Add locking for tasks
  xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)
2015-10-24 07:20:57 +09:00
Linus Torvalds 37902bc190 Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs fixes from Chris Mason:
 "I have two more small fixes this week:

  Qu's fix avoids unneeded COW during fallocate, and Christian found a
  memory leak in the error handling of an earlier fix"

* 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: fix possible leak in btrfs_ioctl_balance()
  btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size
2015-10-24 07:17:58 +09:00
Joseph Qi b67de018b3 ocfs2/dlm: unlock lockres spinlock before dlm_lockres_put
dlm_lockres_put will call dlm_lockres_release if it is the last
reference, and then it may call dlm_print_one_lock_resource and
take lockres spinlock.

So unlock lockres spinlock before dlm_lockres_put to avoid deadlock.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-10-23 17:55:10 +09:00
Christian Engelmayer 0f89abf56a btrfs: fix possible leak in btrfs_ioctl_balance()
Commit 8eb934591f ("btrfs: check unsupported filters in balance
arguments") adds a jump to exit label out_bargs in case the argument
check fails. At this point in addition to the bargs memory, the
memory for struct btrfs_balance_control has already been allocated.
Ownership of bctl is passed to btrfs_balance() in the good case,
thus the memory is not freed due to the introduced jump. Make sure
that the memory gets freed in any case as necessary. Detected by
Coverity CID 1328378.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2015-10-21 18:10:02 -07:00
Qu Wenruo 0f6925fa29 btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size
Current code will always truncate tailing page if its alloc_start is
smaller than inode size.

For example, the file extent layout is like:
0	4K	8K	16K	32K
|<-----Extent A---------------->|
|<--Inode size: 18K---------->|

But if calling fallocate even for range [0,4K), it will cause btrfs to
re-truncate the range [16,32K), causing COW and a new extent.

0	4K	8K	16K	32K
|///////|	<- Fallocate call range
|<-----Extent A-------->|<--B-->|

The cause is quite easy, just a careless btrfs_truncate_inode() in a
else branch without extra judgment.
Fix it by add judgment on whether the fallocate range is beyond isize.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
2015-10-20 19:07:29 -07:00
Linus Torvalds 6aa8ca4df0 Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs fixes from Chris Mason:
 "I have two more bug fixes for btrfs.

  My commit fixes a bug we hit last week at FB, a combination of lots of
  hard links and an admin command to resolve inode numbers.

  Dave is adding checks to make sure balance on current kernels ignores
  filters it doesn't understand.  The penalty for being wrong is just
  doing more work (not crashing etc), but it's a good fix"

* 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: fix use after free iterating extrefs
  btrfs: check unsupported filters in balance arguments
2015-10-16 12:55:34 -07:00
Linus Torvalds 3d875182d7 Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
 "6 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  sh: add copy_user_page() alias for __copy_user()
  lib/Kconfig: ZLIB_DEFLATE must select BITREVERSE
  mm, dax: fix DAX deadlocks
  memcg: convert threshold to bytes
  builddeb: remove debian/files before build
  mm, fs: obey gfp_mapping for add_to_page_cache()
2015-10-16 11:42:37 -07:00
Ross Zwisler 0f90cc6609 mm, dax: fix DAX deadlocks
The following two locking commits in the DAX code:

commit 843172978b ("dax: fix race between simultaneous faults")
commit 46c043ede4 ("mm: take i_mmap_lock in unmap_mapping_range() for DAX")

introduced a number of deadlocks and other issues which need to be fixed
for the v4.3 kernel.  The list of issues in DAX after these commits
(some newly introduced by the commits, some preexisting) can be found
here:

  https://lkml.org/lkml/2015/9/25/602 (Subject: "Re: [PATCH] dax: fix deadlock in __dax_fault").

This undoes most of the changes introduced by those two commits,
essentially returning us to the DAX locking scheme that was used in
v4.2.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Dan Williams <dan.j.williams@intel.com>
Tested-by: Dave Chinner <dchinner@redhat.com>
Cc: Jan Kara <jack@suse.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-10-16 11:42:28 -07:00
Michal Hocko 063d99b4fa mm, fs: obey gfp_mapping for add_to_page_cache()
Commit 6afdb859b7 ("mm: do not ignore mapping_gfp_mask in page cache
allocation paths") has caught some users of hardcoded GFP_KERNEL used in
the page cache allocation paths.  This, however, wasn't complete and
there were others which went unnoticed.

Dave Chinner has reported the following deadlock for xfs on loop device:
: With the recent merge of the loop device changes, I'm now seeing
: XFS deadlock on my single CPU, 1GB RAM VM running xfs/073.
:
: The deadlocked is as follows:
:
: kloopd1: loop_queue_read_work
:       xfs_file_iter_read
:       lock XFS inode XFS_IOLOCK_SHARED (on image file)
:       page cache read (GFP_KERNEL)
:       radix tree alloc
:       memory reclaim
:       reclaim XFS inodes
:       log force to unpin inodes
:       <wait for log IO completion>
:
: xfs-cil/loop1: <does log force IO work>
:       xlog_cil_push
:       xlog_write
:       <loop issuing log writes>
:               xlog_state_get_iclog_space()
:               <blocks due to all log buffers under write io>
:               <waits for IO completion>
:
: kloopd1: loop_queue_write_work
:       xfs_file_write_iter
:       lock XFS inode XFS_IOLOCK_EXCL (on image file)
:       <wait for inode to be unlocked>
:
: i.e. the kloopd, with it's split read and write work queues, has
: introduced a dependency through memory reclaim. i.e. that writes
: need to be able to progress for reads make progress.
:
: The problem, fundamentally, is that mpage_readpages() does a
: GFP_KERNEL allocation, rather than paying attention to the inode's
: mapping gfp mask, which is set to GFP_NOFS.
:
: The didn't used to happen, because the loop device used to issue
: reads through the splice path and that does:
:
:       error = add_to_page_cache_lru(page, mapping, index,
:                       GFP_KERNEL & mapping_gfp_mask(mapping));

This has changed by commit aa4d86163e ("block: loop: switch to VFS
ITER_BVEC").

This patch changes mpage_readpage{s} to follow gfp mask set for the
mapping.  There are, however, other places which are doing basically the
same.

lustre:ll_dir_filler is doing GFP_KERNEL from the function which
apparently uses GFP_NOFS for other allocations so let's make this
consistent.

cifs:readpages_get_pages is called from cifs_readpages and
__cifs_readpages_from_fscache called from the same path obeys mapping
gfp.

ramfs_nommu_expand_for_mapping is hardcoding GFP_KERNEL as well
regardless it uses mapping_gfp_mask for the page allocation.

ext4_mpage_readpages is the called from the page cache allocation path
same as read_pages and read_cache_pages

As I've noticed in my previous post I cannot say I would be happy about
sprinkling mapping_gfp_mask all over the place and it sounds like we
should drop gfp_mask argument altogether and use it internally in
__add_to_page_cache_locked that would require all the filesystems to use
mapping gfp consistently which I am not sure is the case here.  From a
quick glance it seems that some file system use it all the time while
others are selective.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Dave Chinner <david@fromorbit.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Ming Lei <ming.lei@canonical.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-10-16 11:42:28 -07:00
Linus Torvalds c7823b6b97 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull ext4 Kconfig description fixup from Jan Kara:
 "A small fixup in description of EXT4_USE_FOR_EXT2 config option"

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  ext4: Update EXT4_USE_FOR_EXT2 description
2015-10-15 13:31:00 -07:00
Chris Mason dc6c5fb3b5 btrfs: fix use after free iterating extrefs
The code for btrfs inode-resolve has never worked properly for
files with enough hard links to trigger extrefs.  It was trying to
get the leaf out of a path after freeing the path:

	btrfs_release_path(path);
	leaf = path->nodes[0];
	item_size = btrfs_item_size_nr(leaf, slot);

The fix here is to use the extent buffer we cloned just a little higher
up to avoid deadlocks caused by using the leaf in the path.

Signed-off-by: Chris Mason <clm@fb.com>
cc: stable@vger.kernel.org # v3.7+
cc: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
2015-10-13 18:54:44 -07:00
David Sterba 8eb934591f btrfs: check unsupported filters in balance arguments
We don't verify that all the balance filter arguments supplemented by
the flags are actually known to the kernel. Thus we let it silently pass
and do nothing.

At the moment this means only the 'limit' filter, but we're going to add
a few more soon so it's better to have that fixed. Also in older stable
kernels so that it works with newer userspace tools.

Cc: stable@vger.kernel.org # 3.16+
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2015-10-13 18:53:03 -07:00
Linus Torvalds 5b5f145527 Two nfsd fixes, one for an RDMA crash, one for a pnfs/block protocol
bug.
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Merge tag 'nfsd-4.3-2' of git://linux-nfs.org/~bfields/linux

Pull nfsd fixes from Bruce Fields:
 "Two nfsd fixes, one for an RDMA crash, one for a pnfs/block protocol
  bug"

* tag 'nfsd-4.3-2' of git://linux-nfs.org/~bfields/linux:
  svcrdma: Fix NFS server crash triggered by 1MB NFS WRITE
  nfsd/blocklayout: accept any minlength
2015-10-13 11:31:03 -07:00
Tejun Heo b817525a4a writeback: bdi_writeback iteration must not skip dying ones
bdi_for_each_wb() is used in several places to wake up or issue
writeback work items to all wb's (bdi_writeback's) on a given bdi.
The iteration is performed by walking bdi->cgwb_tree; however, the
tree only indexes wb's which are currently active.

For example, when a memcg gets associated with a different blkcg, the
old wb is removed from the tree so that the new one can be indexed.
The old wb starts dying from then on but will linger till all its
inodes are drained.  As these dying wb's may still host dirty inodes,
writeback operations which affect all wb's must include them.
bdi_for_each_wb() skipping dying wb's led to sync(2) missing and
failing to sync the inodes belonging to those wb's.

This patch adds a RCU protected @bdi->wb_list which lists all wb's
beloinging to that bdi.  wb's are added on creation and removed on
release rather than on the start of destruction.  bdi_for_each_wb()
usages are replaced with list_for_each[_continue]_rcu() iterations
over @bdi->wb_list and bdi_for_each_wb() and its helpers are removed.

v2: Updated as per Jan.  last_wb ref leak in bdi_split_work_to_wbs()
    fixed and unnecessary list head severing in cgwb_bdi_destroy()
    removed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Artem Bityutskiy <dedekind1@gmail.com>
Fixes: ebe41ab0c7 ("writeback: implement bdi_for_each_wb()")
Link: http://lkml.kernel.org/g/1443012552.19983.209.camel@gmail.com
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
2015-10-12 10:31:12 -06:00
Tejun Heo 6fdf860f15 writeback: fix bdi_writeback iteration in wakeup_dirtytime_writeback()
wakeup_dirtytime_writeback() walks and wakes up all wb's of all bdi's;
unfortunately, it was always waking up bdi->wb instead of the wb being
walked.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 001fe6f617 ("writeback: make wakeup_dirtytime_writeback() handle multiple bdi_writeback's")
Reviewed-by: Jan Kara <jack@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2015-10-12 10:31:11 -06:00
Trond Myklebust daf3761c9f namei: results of d_is_negative() should be checked after dentry revalidation
Leandro Awa writes:
 "After switching to version 4.1.6, our parallelized and distributed
  workflows now fail consistently with errors of the form:

  T34: ./regex.c:39:22: error: config.h: No such file or directory

  From our 'git bisect' testing, the following commit appears to be the
  possible cause of the behavior we've been seeing: commit 766c4cbfacd8"

Al Viro says:
 "What happens is that 766c4cbfac got the things subtly wrong.

  We used to treat d_is_negative() after lookup_fast() as "fall with
  ENOENT".  That was wrong - checking ->d_flags outside of ->d_seq
  protection is unreliable and failing with hard error on what should've
  fallen back to non-RCU pathname resolution is a bug.

  Unfortunately, we'd pulled the test too far up and ran afoul of
  another kind of staleness.  The dentry might have been absolutely
  stable from the RCU point of view (and we might be on UP, etc), but
  stale from the remote fs point of view.  If ->d_revalidate() returns
  "it's actually stale", dentry gets thrown away and the original code
  wouldn't even have looked at its ->d_flags.

  What we need is to check ->d_flags where 766c4cbfac does (prior to
  ->d_seq validation) but only use the result in cases where we do not
  discard this dentry outright"

Reported-by: Leandro Awa <lawa@nvidia.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=104911
Fixes: 766c4cbfac ("namei: d_is_negative() should be checked...")
Tested-by: Leandro Awa <lawa@nvidia.com>
Cc: stable@vger.kernel.org # v4.1+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-10-10 10:17:27 -07:00
Linus Torvalds 175d58cfed Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs fixes from Chris Mason:
 "These are small and assorted.  Neil's is the oldest, I dropped the
  ball thinking he was going to send it in"

* 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: support NFSv2 export
  Btrfs: open_ctree: Fix possible memory leak
  Btrfs: fix deadlock when finalizing block group creation
  Btrfs: update fix for read corruption of compressed and shared extents
  Btrfs: send, fix corner case for reference overwrite detection
2015-10-09 16:39:35 -07:00
Christoph Hellwig 8c3ad9cb73 nfsd/blocklayout: accept any minlength
Recent Linux clients have started to send GETLAYOUT requests with
minlength less than blocksize.

Servers aren't really allowed to impose this kind of restriction on
layouts; see RFC 5661 section 18.43.3 for details.

This has been observed to cause indefinite hangs on fsx runs on some
clients.

Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-10-09 16:11:40 -04:00
Linus Torvalds a0eeb8dd34 NFS client bugfixes for Linux 4.3
Highlights include:
 
 Bugfixes:
 - Fix a use-after-free bug in the RPC/RDMA client
 - Fix a write performance regression
 - Fix up page writeback accounting
 - Don't try to reclaim unused state owners
 - Fix a NFSv4 nograce recovery hang
 - reset states to use open_stateid when returning delegation voluntarily
 - Fix a tracepoint NULL-pointer dereference
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Merge tag 'nfs-for-4.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

  Bugfixes:
   - Fix a use-after-free bug in the RPC/RDMA client
   - Fix a write performance regression
   - Fix up page writeback accounting
   - Don't try to reclaim unused state owners
   - Fix a NFSv4 nograce recovery hang
   - reset states to use open_stateid when returning delegation
     voluntarily
   - Fix a tracepoint NULL-pointer dereference"

* tag 'nfs-for-4.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: Fix a tracepoint NULL-pointer dereference
  nfs4: reset states to use open_stateid when returning delegation voluntarily
  NFSv4: Fix a nograce recovery hang
  NFSv4.1: nfs4_opendata_check_deleg needs to handle NFS4_OPEN_CLAIM_DELEG_CUR_FH
  NFSv4: Don't try to reclaim unused state owners
  NFS: Fix a write performance regression
  NFS: Fix up page writeback accounting
  xprtrdma: disconnect and flush cqs before freeing buffers
2015-10-07 08:54:22 +01:00
Anna Schumaker 39d0d3bdf7 NFS: Fix a tracepoint NULL-pointer dereference
Running xfstest generic/013 with the tracepoint nfs:nfs4_open_file
enabled produces a NULL-pointer dereference when calculating fileid and
filehandle of the opened file.  Fix this by checking if state is NULL
before trying to use the inode pointer.

Reported-by: Olga Kornievskaia <aglo@umich.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-06 18:56:25 -04:00
NeilBrown 7d35199e15 BTRFS: support NFSv2 export
The "fh_len" passed to ->fh_to_* is not guaranteed to be that same as
that returned by encode_fh - it may be larger.

With NFSv2, the filehandle is fixed length, so it may appear longer
than expected and be zero-padded.

So we must test that fh_len is at least some value, not exactly equal
to it.

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: David Sterba <dsterba@suse.cz>
2015-10-06 06:55:23 -07:00
chandan e5fffbac4a Btrfs: open_ctree: Fix possible memory leak
After reading one of chunk or tree root tree's root node from disk, if the
root node does not have EXTENT_BUFFER_UPTODATE flag set, we fail to release
the memory used by the root node. Fix this.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
2015-10-06 06:55:22 -07:00
Linus Torvalds 3c68319b28 Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
Pull CIFS fixes from Steve French:
 "Two fixes for problems pointed out by automated tools.

  Thanks PaX/grsecurity team and Dan Carpenter (and the Smatch tool)"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  [CIFS] Update cifs version number
  [SMB3] Do not fall back to SMBWriteX in set_file_size error cases
  [SMB3] Missing null tcon check
2015-10-06 14:30:21 +01:00
Filipe Manana d9a0540a79 Btrfs: fix deadlock when finalizing block group creation
Josef ran into a deadlock while a transaction handle was finalizing the
creation of its block groups, which produced the following trace:

  [260445.593112] fio             D ffff88022a9df468     0  8924   4518 0x00000084
  [260445.593119]  ffff88022a9df468 ffffffff81c134c0 ffff880429693c00 ffff88022a9df488
  [260445.593126]  ffff88022a9e0000 ffff8803490d7b00 ffff8803490d7b18 ffff88022a9df4b0
  [260445.593132]  ffff8803490d7af8 ffff88022a9df488 ffffffff8175a437 ffff8803490d7b00
  [260445.593137] Call Trace:
  [260445.593145]  [<ffffffff8175a437>] schedule+0x37/0x80
  [260445.593189]  [<ffffffffa0850f37>] btrfs_tree_lock+0xa7/0x1f0 [btrfs]
  [260445.593197]  [<ffffffff810db7c0>] ? prepare_to_wait_event+0xf0/0xf0
  [260445.593225]  [<ffffffffa07eac44>] btrfs_lock_root_node+0x34/0x50 [btrfs]
  [260445.593253]  [<ffffffffa07eff6b>] btrfs_search_slot+0x88b/0xa00 [btrfs]
  [260445.593295]  [<ffffffffa08389df>] ? free_extent_buffer+0x4f/0x90 [btrfs]
  [260445.593324]  [<ffffffffa07f1a06>] btrfs_insert_empty_items+0x66/0xc0 [btrfs]
  [260445.593351]  [<ffffffffa07ea94a>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
  [260445.593394]  [<ffffffffa08403b9>] btrfs_finish_chunk_alloc+0x1c9/0x570 [btrfs]
  [260445.593427]  [<ffffffffa08002ab>] btrfs_create_pending_block_groups+0x11b/0x200 [btrfs]
  [260445.593459]  [<ffffffffa0800964>] do_chunk_alloc+0x2a4/0x2e0 [btrfs]
  [260445.593491]  [<ffffffffa0803815>] find_free_extent+0xa55/0xd90 [btrfs]
  [260445.593524]  [<ffffffffa0803c22>] btrfs_reserve_extent+0xd2/0x220 [btrfs]
  [260445.593532]  [<ffffffff8119fe5d>] ? account_page_dirtied+0xdd/0x170
  [260445.593564]  [<ffffffffa0803e78>] btrfs_alloc_tree_block+0x108/0x4a0 [btrfs]
  [260445.593597]  [<ffffffffa080c9de>] ? btree_set_page_dirty+0xe/0x10 [btrfs]
  [260445.593626]  [<ffffffffa07eb5cd>] __btrfs_cow_block+0x12d/0x5b0 [btrfs]
  [260445.593654]  [<ffffffffa07ebbff>] btrfs_cow_block+0x11f/0x1c0 [btrfs]
  [260445.593682]  [<ffffffffa07ef8c7>] btrfs_search_slot+0x1e7/0xa00 [btrfs]
  [260445.593724]  [<ffffffffa08389df>] ? free_extent_buffer+0x4f/0x90 [btrfs]
  [260445.593752]  [<ffffffffa07f1a06>] btrfs_insert_empty_items+0x66/0xc0 [btrfs]
  [260445.593830]  [<ffffffffa07ea94a>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
  [260445.593905]  [<ffffffffa08403b9>] btrfs_finish_chunk_alloc+0x1c9/0x570 [btrfs]
  [260445.593946]  [<ffffffffa08002ab>] btrfs_create_pending_block_groups+0x11b/0x200 [btrfs]
  [260445.593990]  [<ffffffffa0815798>] btrfs_commit_transaction+0xa8/0xb40 [btrfs]
  [260445.594042]  [<ffffffffa085abcd>] ? btrfs_log_dentry_safe+0x6d/0x80 [btrfs]
  [260445.594089]  [<ffffffffa082bc84>] btrfs_sync_file+0x294/0x350 [btrfs]
  [260445.594115]  [<ffffffff8123e29b>] vfs_fsync_range+0x3b/0xa0
  [260445.594133]  [<ffffffff81023891>] ? syscall_trace_enter_phase1+0x131/0x180
  [260445.594149]  [<ffffffff8123e35d>] do_fsync+0x3d/0x70
  [260445.594169]  [<ffffffff81023bb8>] ? syscall_trace_leave+0xb8/0x110
  [260445.594187]  [<ffffffff8123e600>] SyS_fsync+0x10/0x20
  [260445.594204]  [<ffffffff8175de6e>] entry_SYSCALL_64_fastpath+0x12/0x71

This happened because the same transaction handle created a large number
of block groups and while finalizing their creation (inserting new items
and updating existing items in the chunk and device trees) a new metadata
extent had to be allocated and no free space was found in the current
metadata block groups, which made find_free_extent() attempt to allocate
a new block group via do_chunk_alloc(). However at do_chunk_alloc() we
ended up allocating a new system chunk too and exceeded the threshold
of 2Mb of reserved chunk bytes, which makes do_chunk_alloc() enter the
final part of block group creation again (at
btrfs_create_pending_block_groups()) and attempt to lock again the root
of the chunk tree when it's already write locked by the same task.

Similarly we can deadlock on extent tree nodes/leafs if while we are
running delayed references we end up creating a new metadata block group
in order to allocate a new node/leaf for the extent tree (as part of
a CoW operation or growing the tree), as btrfs_create_pending_block_groups
inserts items into the extent tree as well. In this case we get the
following trace:

  [14242.773581] fio             D ffff880428ca3418     0  3615   3100 0x00000084
  [14242.773588]  ffff880428ca3418 ffff88042d66b000 ffff88042a03c800 ffff880428ca3438
  [14242.773594]  ffff880428ca4000 ffff8803e4b20190 ffff8803e4b201a8 ffff880428ca3460
  [14242.773600]  ffff8803e4b20188 ffff880428ca3438 ffffffff8175a437 ffff8803e4b20190
  [14242.773606] Call Trace:
  [14242.773613]  [<ffffffff8175a437>] schedule+0x37/0x80
  [14242.773656]  [<ffffffffa057ff07>] btrfs_tree_lock+0xa7/0x1f0 [btrfs]
  [14242.773664]  [<ffffffff810db7c0>] ? prepare_to_wait_event+0xf0/0xf0
  [14242.773692]  [<ffffffffa0519c44>] btrfs_lock_root_node+0x34/0x50 [btrfs]
  [14242.773720]  [<ffffffffa051ef6b>] btrfs_search_slot+0x88b/0xa00 [btrfs]
  [14242.773750]  [<ffffffffa0520a06>] btrfs_insert_empty_items+0x66/0xc0 [btrfs]
  [14242.773758]  [<ffffffff811ef4a2>] ? kmem_cache_alloc+0x1d2/0x200
  [14242.773786]  [<ffffffffa0520ad1>] btrfs_insert_item+0x71/0xf0 [btrfs]
  [14242.773818]  [<ffffffffa052f292>] btrfs_create_pending_block_groups+0x102/0x200 [btrfs]
  [14242.773850]  [<ffffffffa052f96e>] do_chunk_alloc+0x2ae/0x2f0 [btrfs]
  [14242.773934]  [<ffffffffa0532825>] find_free_extent+0xa55/0xd90 [btrfs]
  [14242.773998]  [<ffffffffa0532c22>] btrfs_reserve_extent+0xc2/0x1d0 [btrfs]
  [14242.774041]  [<ffffffffa0532e38>] btrfs_alloc_tree_block+0x108/0x4a0 [btrfs]
  [14242.774078]  [<ffffffffa051a5cd>] __btrfs_cow_block+0x12d/0x5b0 [btrfs]
  [14242.774118]  [<ffffffffa051abff>] btrfs_cow_block+0x11f/0x1c0 [btrfs]
  [14242.774155]  [<ffffffffa051e8c7>] btrfs_search_slot+0x1e7/0xa00 [btrfs]
  [14242.774194]  [<ffffffffa0528021>] ? __btrfs_free_extent.isra.70+0x2e1/0xcb0 [btrfs]
  [14242.774235]  [<ffffffffa0520a06>] btrfs_insert_empty_items+0x66/0xc0 [btrfs]
  [14242.774274]  [<ffffffffa051994a>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
  [14242.774318]  [<ffffffffa052c433>] __btrfs_run_delayed_refs+0xbb3/0x1020 [btrfs]
  [14242.774358]  [<ffffffffa052f404>] btrfs_run_delayed_refs.part.78+0x74/0x280 [btrfs]
  [14242.774391]  [<ffffffffa052f627>] btrfs_run_delayed_refs+0x17/0x20 [btrfs]
  [14242.774432]  [<ffffffffa05be236>] commit_cowonly_roots+0x8d/0x2bd [btrfs]
  [14242.774474]  [<ffffffffa059d07f>] ? __btrfs_run_delayed_items+0x1cf/0x210 [btrfs]
  [14242.774516]  [<ffffffffa05adac3>] ? btrfs_qgroup_account_extents+0x83/0x130 [btrfs]
  [14242.774558]  [<ffffffffa0544c40>] btrfs_commit_transaction+0x590/0xb40 [btrfs]
  [14242.774599]  [<ffffffffa0589b9d>] ? btrfs_log_dentry_safe+0x6d/0x80 [btrfs]
  [14242.774642]  [<ffffffffa055ac54>] btrfs_sync_file+0x294/0x350 [btrfs]
  [14242.774650]  [<ffffffff8123e29b>] vfs_fsync_range+0x3b/0xa0
  [14242.774657]  [<ffffffff81023891>] ? syscall_trace_enter_phase1+0x131/0x180
  [14242.774663]  [<ffffffff8123e35d>] do_fsync+0x3d/0x70
  [14242.774669]  [<ffffffff81023bb8>] ? syscall_trace_leave+0xb8/0x110
  [14242.774675]  [<ffffffff8123e600>] SyS_fsync+0x10/0x20
  [14242.774681]  [<ffffffff8175de6e>] entry_SYSCALL_64_fastpath+0x12/0x71

Fix this by never recursing into the finalization phase of block group
creation and making sure we never trigger the finalization of block group
creation while running delayed references.

Reported-by: Josef Bacik <jbacik@fb.com>
Fixes: 00d80e342c ("Btrfs: fix quick exhaustion of the system array in the superblock")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-10-05 16:56:38 -07:00
Filipe Manana 808f80b467 Btrfs: update fix for read corruption of compressed and shared extents
My previous fix in commit 005efedf2c ("Btrfs: fix read corruption of
compressed and shared extents") was effective only if the compressed
extents cover a file range with a length that is not a multiple of 16
pages. That's because the detection of when we reached a different range
of the file that shares the same compressed extent as the previously
processed range was done at extent_io.c:__do_contiguous_readpages(),
which covers subranges with a length up to 16 pages, because
extent_readpages() groups the pages in clusters no larger than 16 pages.
So fix this by tracking the start of the previously processed file
range's extent map at extent_readpages().

The following test case for fstests reproduces the issue:

  seq=`basename $0`
  seqres=$RESULT_DIR/$seq
  echo "QA output created by $seq"
  tmp=/tmp/$$
  status=1	# failure is the default!
  trap "_cleanup; exit \$status" 0 1 2 3 15

  _cleanup()
  {
      rm -f $tmp.*
  }

  # get standard environment, filters and checks
  . ./common/rc
  . ./common/filter

  # real QA test starts here
  _need_to_be_root
  _supported_fs btrfs
  _supported_os Linux
  _require_scratch
  _require_cloner

  rm -f $seqres.full

  test_clone_and_read_compressed_extent()
  {
      local mount_opts=$1

      _scratch_mkfs >>$seqres.full 2>&1
      _scratch_mount $mount_opts

      # Create our test file with a single extent of 64Kb that is going to
      # be compressed no matter which compression algo is used (zlib/lzo).
      $XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 64K" \
          $SCRATCH_MNT/foo | _filter_xfs_io

      # Now clone the compressed extent into an adjacent file offset.
      $CLONER_PROG -s 0 -d $((64 * 1024)) -l $((64 * 1024)) \
          $SCRATCH_MNT/foo $SCRATCH_MNT/foo

      echo "File digest before unmount:"
      md5sum $SCRATCH_MNT/foo | _filter_scratch

      # Remount the fs or clear the page cache to trigger the bug in
      # btrfs. Because the extent has an uncompressed length that is a
      # multiple of 16 pages, all the pages belonging to the second range
      # of the file (64K to 128K), which points to the same extent as the
      # first range (0K to 64K), had their contents full of zeroes instead
      # of the byte 0xaa. This was a bug exclusively in the read path of
      # compressed extents, the correct data was stored on disk, btrfs
      # just failed to fill in the pages correctly.
      _scratch_remount

      echo "File digest after remount:"
      # Must match the digest we got before.
      md5sum $SCRATCH_MNT/foo | _filter_scratch
  }

  echo -e "\nTesting with zlib compression..."
  test_clone_and_read_compressed_extent "-o compress=zlib"

  _scratch_unmount

  echo -e "\nTesting with lzo compression..."
  test_clone_and_read_compressed_extent "-o compress=lzo"

  status=0
  exit

Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Tested-by: Timofey Titovets <nefelim4ag@gmail.com>
2015-10-05 16:56:27 -07:00
Filipe Manana b786f16ac3 Btrfs: send, fix corner case for reference overwrite detection
When the inode given to did_overwrite_ref() matches the current progress
and has a reference that collides with the reference of other inode that
has the same number as the current progress, we were always telling our
caller that the inode's reference was overwritten, which is incorrect
because the other inode might be a new inode (different generation number)
in which case we must return false from did_overwrite_ref() so that its
callers don't use an orphanized path for the inode (as it will never be
orphanized, instead it will be unlinked and the new inode created later).

The following test case for fstests reproduces the issue:

  seq=`basename $0`
  seqres=$RESULT_DIR/$seq
  echo "QA output created by $seq"

  tmp=/tmp/$$
  status=1	# failure is the default!
  trap "_cleanup; exit \$status" 0 1 2 3 15

  _cleanup()
  {
      rm -fr $send_files_dir
      rm -f $tmp.*
  }

  # get standard environment, filters and checks
  . ./common/rc
  . ./common/filter

  # real QA test starts here
  _supported_fs btrfs
  _supported_os Linux
  _require_scratch
  _need_to_be_root

  send_files_dir=$TEST_DIR/btrfs-test-$seq

  rm -f $seqres.full
  rm -fr $send_files_dir
  mkdir $send_files_dir

  _scratch_mkfs >>$seqres.full 2>&1
  _scratch_mount

  # Create our test file with a single extent of 64K.
  mkdir -p $SCRATCH_MNT/foo
  $XFS_IO_PROG -f -c "pwrite -S 0xaa 0 64K" $SCRATCH_MNT/foo/bar \
      | _filter_xfs_io

  _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT \
      $SCRATCH_MNT/mysnap1
  _run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT \
      $SCRATCH_MNT/mysnap2

  echo "File digest before being replaced:"
  md5sum $SCRATCH_MNT/mysnap1/foo/bar | _filter_scratch

  # Remove the file and then create a new one in the same location with
  # the same name but with different content. This new file ends up
  # getting the same inode number as the previous one, because that inode
  # number was the highest inode number used by the snapshot's root and
  # therefore when attempting to find the a new inode number for the new
  # file, we end up reusing the same inode number. This happens because
  # currently btrfs uses the highest inode number summed by 1 for the
  # first inode created once a snapshot's root is loaded (done at
  # fs/btrfs/inode-map.c:btrfs_find_free_objectid in the linux kernel
  # tree).
  # Having these two different files in the snapshots with the same inode
  # number (but different generation numbers) caused the btrfs send code
  # to emit an incorrect path for the file when issuing an unlink
  # operation because it failed to realize they were different files.
  rm -f $SCRATCH_MNT/mysnap2/foo/bar
  $XFS_IO_PROG -f -c "pwrite -S 0xbb 0 96K" \
      $SCRATCH_MNT/mysnap2/foo/bar | _filter_xfs_io

  _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT/mysnap2 \
      $SCRATCH_MNT/mysnap2_ro

  _run_btrfs_util_prog send $SCRATCH_MNT/mysnap1 -f $send_files_dir/1.snap
  _run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 \
      $SCRATCH_MNT/mysnap2_ro -f $send_files_dir/2.snap

  echo "File digest in the original filesystem after being replaced:"
  md5sum $SCRATCH_MNT/mysnap2_ro/foo/bar | _filter_scratch

  # Now recreate the filesystem by receiving both send streams and verify
  # we get the same file contents that the original filesystem had.
  _scratch_unmount
  _scratch_mkfs >>$seqres.full 2>&1
  _scratch_mount

  _run_btrfs_util_prog receive -vv $SCRATCH_MNT -f $send_files_dir/1.snap
  _run_btrfs_util_prog receive -vv $SCRATCH_MNT -f $send_files_dir/2.snap

  echo "File digest in the new filesystem:"
  # Must match the digest from the new file.
  md5sum $SCRATCH_MNT/mysnap2_ro/foo/bar | _filter_scratch

  status=0
  exit

Reported-by: Martin Raiber <martin@urbackup.org>
Fixes: 8b191a6849 ("Btrfs: incremental send, check if orphanized dir inode needs delayed rename")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
2015-10-05 16:56:27 -07:00
Steve French 616a5399b8 [CIFS] Update cifs version number
Update modinfo cifs.ko version number to 2.08

Signed-off-by: Steve French <steve.french@primarydata.com>
2015-10-03 16:54:17 -05:00
Jeff Layton 5e99b532bb nfs4: reset states to use open_stateid when returning delegation voluntarily
When the client goes to return a delegation, it should always update any
nfs4_state currently set up to use that delegation stateid to instead
use the open stateid. It already does do this in some cases,
particularly in the state recovery code, but not currently when the
delegation is voluntarily returned (e.g. in advance of a RENAME).  This
causes the client to try to continue using the delegation stateid after
the DELEGRETURN, e.g. in LAYOUTGET.

Set the nfs4_state back to using the open stateid in
nfs4_open_delegation_recall, just before clearing the
NFS_DELEGATED_STATE bit.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-02 15:43:07 -04:00
Benjamin Coddington e92c1e0d40 NFSv4: Fix a nograce recovery hang
Since commit 5cae02f427 an OPEN_CONFIRM should
have a privileged sequence in the recovery case to allow nograce recovery to
proceed for NFSv4.0.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-02 15:43:07 -04:00
Trond Myklebust 72d79ff83c NFSv4.1: nfs4_opendata_check_deleg needs to handle NFS4_OPEN_CLAIM_DELEG_CUR_FH
We need to warn against broken NFSv4.1 servers that try to hand out
delegations in response to NFS4_OPEN_CLAIM_DELEG_CUR_FH.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-02 15:43:07 -04:00
Trond Myklebust 4a0954ef34 NFSv4: Don't try to reclaim unused state owners
Currently, we don't test if the state owner is in use before we try to
recover it. The problem is that if the refcount is zero, then the
state owner will be waiting on the lru list for garbage collection.
The expectation in that case is that if you bump the refcount, then
you must also remove the state owner from the lru list. Otherwise
the call to nfs4_put_state_owner will corrupt that list by trying
to add our state owner a second time.

Avoid the whole problem by just skipping state owners that hold no
state.

Reported-by: Andrew W Elble <aweits@rit.edu>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-02 15:43:07 -04:00
Trond Myklebust 8fa4592a14 NFS: Fix a write performance regression
If all other conditions in nfs_can_extend_write() are met, and there
are no locks, then we should be able to assume close-to-open semantics
and the ability to extend our write to cover the whole page.

With this patch, the xfstests generic/074 test completes in 242s instead
of >1400s on my test rig.

Fixes: bd61e0a9c8 ("locks: convert posix locks to file_lock_context")
Cc: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-02 15:43:07 -04:00
Trond Myklebust 40f90271a8 NFS: Fix up page writeback accounting
Currently, we are crediting all the calls to nfs_writepages_callback()
(i.e. the nfs_writepages() callback) to nfs_writepage(). Aside from
being inconsistent with the behaviour of the equivalent readpage/readpages
accounting, this also means that we cannot distinguish between bulk writes
and single page writebacks (which confuses the 'nfsiostat -p' tool).

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-10-02 15:43:07 -04:00
Steve French 646200a041 [SMB3] Do not fall back to SMBWriteX in set_file_size error cases
The error paths in set_file_size for cifs and smb3 are incorrect.

In the unlikely event that a server did not support set file info
of the file size, the code incorrectly falls back to trying SMBWriteX
(note that only the original core SMB Write, used for example by DOS,
can set the file size this way - this actually  does not work for the more
recent SMBWriteX).  The idea was since the old DOS SMB Write could set
the file size if you write zero bytes at that offset then use that if
server rejects the normal set file info call.

Fortunately the SMBWriteX will never be sent on the wire (except when
file size is zero) since the length and offset fields were reversed
in the two places in this function that call SMBWriteX causing
the fall back path to return an error. It is also important to never call
an SMB request from an SMB2/sMB3 session (which theoretically would
be possible, and can cause a brief session drop, although the client
recovers) so this should be fixed.  In practice this path does not happen
with modern servers but the error fall back to SMBWriteX is clearly wrong.

Removing the calls to SMBWriteX in the error paths in cifs_set_file_size

Pointed out by PaX/grsecurity team

Signed-off-by: Steve French <steve.french@primarydata.com>
Reported-by: PaX Team <pageexec@freemail.hu>
CC: Emese Revfy <re.emese@gmail.com>
CC: Brad Spengler <spender@grsecurity.net>
CC: Stable <stable@vger.kernel.org>
2015-10-01 22:48:37 -05:00
Ross Zwisler 8346c416d1 dax: fix NULL pointer in __dax_pmd_fault()
Commit 46c043ede4 ("mm: take i_mmap_lock in unmap_mapping_range() for
DAX") moved some code in __dax_pmd_fault() that was responsible for
zeroing newly allocated PMD pages.  The new location didn't properly set
up 'kaddr', so when run this code resulted in a NULL pointer BUG.

Fix this by getting the correct 'kaddr' via bdev_direct_access().

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reported-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-10-01 21:42:35 -04:00
Linus Torvalds f97b870ece This pull request contains three bug fixes for both UBI
and UBIFS.
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Merge tag 'upstream-4.3-rc4' of git://git.infradead.org/linux-ubifs

Pull UBI/UBIFS fixes from Richard Weinberger:
 "This contains three bug fixes for both UBI and UBIFS"

* tag 'upstream-4.3-rc4' of git://git.infradead.org/linux-ubifs:
  UBI: return ENOSPC if no enough space available
  UBI: Validate data_size
  UBIFS: Kill unneeded locking in ubifs_init_security
2015-10-01 07:57:27 -04:00
Richard Weinberger cf6f54e3f1 UBIFS: Kill unneeded locking in ubifs_init_security
Fixes the following lockdep splat:
[    1.244527] =============================================
[    1.245193] [ INFO: possible recursive locking detected ]
[    1.245193] 4.2.0-rc1+ #37 Not tainted
[    1.245193] ---------------------------------------------
[    1.245193] cp/742 is trying to acquire lock:
[    1.245193]  (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff812b3f69>] ubifs_init_security+0x29/0xb0
[    1.245193]
[    1.245193] but task is already holding lock:
[    1.245193]  (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff81198e7f>] path_openat+0x3af/0x1280
[    1.245193]
[    1.245193] other info that might help us debug this:
[    1.245193]  Possible unsafe locking scenario:
[    1.245193]
[    1.245193]        CPU0
[    1.245193]        ----
[    1.245193]   lock(&sb->s_type->i_mutex_key#9);
[    1.245193]   lock(&sb->s_type->i_mutex_key#9);
[    1.245193]
[    1.245193]  *** DEADLOCK ***
[    1.245193]
[    1.245193]  May be due to missing lock nesting notation
[    1.245193]
[    1.245193] 2 locks held by cp/742:
[    1.245193]  #0:  (sb_writers#5){.+.+.+}, at: [<ffffffff811ad37f>] mnt_want_write+0x1f/0x50
[    1.245193]  #1:  (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff81198e7f>] path_openat+0x3af/0x1280
[    1.245193]
[    1.245193] stack backtrace:
[    1.245193] CPU: 2 PID: 742 Comm: cp Not tainted 4.2.0-rc1+ #37
[    1.245193] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140816_022509-build35 04/01/2014
[    1.245193]  ffffffff8252d530 ffff88007b023a38 ffffffff814f6f49 ffffffff810b56c5
[    1.245193]  ffff88007c30cc80 ffff88007b023af8 ffffffff810a150d ffff88007b023a68
[    1.245193]  000000008101302a ffff880000000000 00000008f447e23f ffffffff8252d500
[    1.245193] Call Trace:
[    1.245193]  [<ffffffff814f6f49>] dump_stack+0x4c/0x65
[    1.245193]  [<ffffffff810b56c5>] ? console_unlock+0x1c5/0x510
[    1.245193]  [<ffffffff810a150d>] __lock_acquire+0x1a6d/0x1ea0
[    1.245193]  [<ffffffff8109fa78>] ? __lock_is_held+0x58/0x80
[    1.245193]  [<ffffffff810a1a93>] lock_acquire+0xd3/0x270
[    1.245193]  [<ffffffff812b3f69>] ? ubifs_init_security+0x29/0xb0
[    1.245193]  [<ffffffff814fc83b>] mutex_lock_nested+0x6b/0x3a0
[    1.245193]  [<ffffffff812b3f69>] ? ubifs_init_security+0x29/0xb0
[    1.245193]  [<ffffffff812b3f69>] ? ubifs_init_security+0x29/0xb0
[    1.245193]  [<ffffffff812b3f69>] ubifs_init_security+0x29/0xb0
[    1.245193]  [<ffffffff8128e286>] ubifs_create+0xa6/0x1f0
[    1.245193]  [<ffffffff81198e7f>] ? path_openat+0x3af/0x1280
[    1.245193]  [<ffffffff81195d15>] vfs_create+0x95/0xc0
[    1.245193]  [<ffffffff8119929c>] path_openat+0x7cc/0x1280
[    1.245193]  [<ffffffff8109ffe3>] ? __lock_acquire+0x543/0x1ea0
[    1.245193]  [<ffffffff81088f20>] ? sched_clock_cpu+0x90/0xc0
[    1.245193]  [<ffffffff81088c00>] ? calc_global_load_tick+0x60/0x90
[    1.245193]  [<ffffffff81088f20>] ? sched_clock_cpu+0x90/0xc0
[    1.245193]  [<ffffffff811a9cef>] ? __alloc_fd+0xaf/0x180
[    1.245193]  [<ffffffff8119ac55>] do_filp_open+0x75/0xd0
[    1.245193]  [<ffffffff814ffd86>] ? _raw_spin_unlock+0x26/0x40
[    1.245193]  [<ffffffff811a9cef>] ? __alloc_fd+0xaf/0x180
[    1.245193]  [<ffffffff81189bd9>] do_sys_open+0x129/0x200
[    1.245193]  [<ffffffff81189cc9>] SyS_open+0x19/0x20
[    1.245193]  [<ffffffff81500717>] entry_SYSCALL_64_fastpath+0x12/0x6f

While the lockdep splat is a false positive, becuase path_openat holds i_mutex
of the parent directory and ubifs_init_security() tries to acquire i_mutex
of a new inode, it reveals that taking i_mutex in ubifs_init_security() is
in vain because it is only being called in the inode allocation path
and therefore nobody else can see the inode yet.

Cc: stable@vger.kernel.org # 3.20-
Reported-and-tested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-and-tested-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: dedekind1@gmail.com
2015-09-29 12:45:42 +02:00
Linus Torvalds 69ea8b8577 Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
Pull CIFS fixes from Steve French:
 "Four fixes from testing at the recent SMB3 Plugfest including two
  important authentication ones (one fixes authentication problems to
  some popular servers when clock times differ more than two hours
  between systems, the other fixes Kerberos authentication for SMB3)"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  fix encryption error checks on mount
  [SMB3] Fix sec=krb5 on smb3 mounts
  cifs: use server timestamp for ntlmv2 authentication
  disabling oplocks/leases via module parm enable_oplocks broken for SMB3
2015-09-27 06:42:54 -04:00
Steve French ff9f84b7d7 [SMB3] Missing null tcon check
Pointed out by Dan Carpenter via smatch code analysis tool

CC: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <steve.french@primarydata.com>
2015-09-26 09:48:58 -05:00
Linus Torvalds 03e8f64486 Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs fixes from Chris Mason:
 "This is an assorted set I've been queuing up:

  Jeff Mahoney tracked down a tricky one where we ended up starting IO
  on the wrong mapping for special files in btrfs_evict_inode.  A few
  people reported this one on the list.

  Filipe found (and provided a test for) a difficult bug in reading
  compressed extents, and Josef fixed up some quota record keeping with
  snapshot deletion.  Chandan killed off an accounting bug during DIO
  that lead to WARN_ONs as we freed inodes"

* 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: keep dropped roots in cache until transaction commit
  Btrfs: Direct I/O: Fix space accounting
  btrfs: skip waiting on ordered range for special files
  Btrfs: fix read corruption of compressed and shared extents
  Btrfs: remove unnecessary locking of cleaner_mutex to avoid deadlock
  Btrfs: don't initialize a space info as full to prevent ENOSPC
2015-09-25 12:08:41 -07:00
Linus Torvalds 101688f534 NFS client bugfixes for Linux 4.3
Highlights include:
 
 Stable patches:
 - fix v4.2 SEEK on files over 2 gigs
 - Fix a layout segment reference leak when pNFS I/O falls back to inband I/O.
 - Fix recovery of recalled read delegations
 
 Bugfixes:
 - Fix a case where NFSv4 fails to send CLOSE after a server reboot
 - Fix sunrpc to wait for connections to complete before retrying
 - Fix sunrpc races between transport connect/disconnect and shutdown
 - Fix an infinite loop when layoutget fail with BAD_STATEID
 - nfs/filelayout: Fix NULL reference caused by double freeing of fh_array
 - Fix a bogus WARN_ON_ONCE() in O_DIRECT when layout commit_through_mds is set
 - Fix layoutreturn/close ordering issues.
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Merge tag 'nfs-for-4.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

  Stable patches:
   - fix v4.2 SEEK on files over 2 gigs
   - Fix a layout segment reference leak when pNFS I/O falls back to inband I/O.
   - Fix recovery of recalled read delegations

  Bugfixes:
   - Fix a case where NFSv4 fails to send CLOSE after a server reboot
   - Fix sunrpc to wait for connections to complete before retrying
   - Fix sunrpc races between transport connect/disconnect and shutdown
   - Fix an infinite loop when layoutget fail with BAD_STATEID
   - nfs/filelayout: Fix NULL reference caused by double freeing of fh_array
   - Fix a bogus WARN_ON_ONCE() in O_DIRECT when layout commit_through_mds is set
   - Fix layoutreturn/close ordering issues"

* tag 'nfs-for-4.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS41: make close wait for layoutreturn
  NFS: Skip checking ds_cinfo.buckets when lseg's commit_through_mds is set
  NFSv4.x/pnfs: Don't try to recover stateids twice in layoutget
  NFSv4: Recovery of recalled read delegations is broken
  NFS: Fix an infinite loop when layoutget fail with BAD_STATEID
  NFS: Do cleanup before resetting pageio read/write to mds
  SUNRPC: xs_sock_mark_closed() does not need to trigger socket autoclose
  SUNRPC: Lock the transport layer on shutdown
  nfs/filelayout: Fix NULL reference caused by double freeing of fh_array
  SUNRPC: Ensure that we wait for connections to complete before retrying
  SUNRPC: drop null test before destroy functions
  nfs: fix v4.2 SEEK on files over 2 gigs
  SUNRPC: Fix races between socket connection and destroy code
  nfs: fix pg_test page count calculation
  Failing to send a CLOSE if file is opened WRONLY and server reboots on a 4.x mount
2015-09-25 11:33:52 -07:00
Jean Delvare d4eb6dee47 ext4: Update EXT4_USE_FOR_EXT2 description
Configuration option EXT4_USE_FOR_EXT2 has no effect on ext3 support.
Support for ext3 is always included now.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: c290ea01ab ("fs: Remove ext3 filesystem driver")
Cc: Jan Kara <jack@suse.cz>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Signed-off-by: Jan Kara <jack@suse.com>
2015-09-24 13:27:47 +02:00
Steve French 8862714840 fix encryption error checks on mount
Signed-off-by: Steve French <steve.french@primarydata.com>
2015-09-24 00:53:31 -05:00
Steve French ceb1b0b9b4 [SMB3] Fix sec=krb5 on smb3 mounts
Kerberos, which is very important for security, was only enabled for
CIFS not SMB2/SMB3 mounts (e.g. vers=3.0)

Patch based on the information detailed in
http://thread.gmane.org/gmane.linux.kernel.cifs/10081/focus=10307
to enable Kerberized SMB2/SMB3

a) SMB2_negotiate: enable/use decode_negTokenInit in SMB2_negotiate
b) SMB2_sess_setup: handle Kerberos sectype and replicate Kerberos
   SMB1 processing done in sess_auth_kerberos

Signed-off-by: Noel Power <noel.power@suse.com>
Signed-off-by: Jim McDonough <jmcd@samba.org>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <steve.french@primarydata.com>
2015-09-24 00:52:37 -05:00
Peng Tao 500d701f33 NFS41: make close wait for layoutreturn
If we send a layoutreturn asynchronously before close, the close
might reach server first and layoutreturn would fail with BADSTATEID
because there is nothing keeping the layout stateid alive.

Also do not pretend sending layoutreturn if we are not.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-09-23 08:55:32 -04:00
Joseph Qi 012572d4fc ocfs2/dlm: fix deadlock when dispatch assert master
The order of the following three spinlocks should be:
dlm_domain_lock < dlm_ctxt->spinlock < dlm_lock_resource->spinlock

But dlm_dispatch_assert_master() is called while holding
dlm_ctxt->spinlock and dlm_lock_resource->spinlock, and then it calls
dlm_grab() which will take dlm_domain_lock.

Once another thread (for example, dlm_query_join_handler) has already
taken dlm_domain_lock, and tries to take dlm_ctxt->spinlock deadlock
happens.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: "Junxiao Bi" <junxiao.bi@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-09-22 15:09:53 -07:00
Andrea Arcangeli ac5be6b47e userfaultfd: revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key"
This reverts commit 51360155ec and adapts
fs/userfaultfd.c to use the old version of that function.

It didn't look robust to call __wake_up_common with "nr == 1" when we
absolutely require wakeall semantics, but we've full control of what we
insert in the two waitqueue heads of the blocked userfaults.  No
exclusive waitqueue risks to be inserted into those two waitqueue heads
so we can as well stick to "nr == 1" of the old code and we can rely
purely on the fact no waitqueue inserted in one of the two waitqueue
heads we must enforce as wakeall, has wait->flags WQ_FLAG_EXCLUSIVE set.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-09-22 15:09:53 -07:00
Kinglong Mee 834e465bba NFS: Skip checking ds_cinfo.buckets when lseg's commit_through_mds is set
When lseg's commit_through_mds is set, pnfs client always WARN once
in nfs_direct_select_verf after checking ds_cinfo.nbuckets.

nfs should use the DS verf except commit_through_mds is set for
layout segment where nbuckets is zero.

[17844.666094] ------------[ cut here ]------------
[17844.667071] WARNING: CPU: 0 PID: 21758 at /root/source/linux-pnfs/fs/nfs/direct.c:174 nfs_direct_select_verf+0x5a/0x70 [nfs]()
[17844.668650] Modules linked in: nfs_layout_nfsv41_files(OE) nfsv4(OE) nfs(OE) fscache(E) nfsd(OE) xfs libcrc32c btrfs ppdev coretemp crct10dif_pclmul auth_rpcgss crc32_pclmul crc32c_intel nfs_acl ghash_clmulni_intel lockd vmw_balloon xor vmw_vmci grace raid6_pq shpchp sunrpc parport_pc i2c_piix4 parport vmwgfx drm_kms_helper ttm drm serio_raw mptspi e1000 scsi_transport_spi mptscsih mptbase ata_generic pata_acpi [last unloaded: fscache]
[17844.686676] CPU: 0 PID: 21758 Comm: kworker/0:1 Tainted: G        W  OE   4.3.0-rc1-pnfs+ #245
[17844.687352] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/20/2014
[17844.698502] Workqueue: nfsiod rpc_async_release [sunrpc]
[17844.699212]  0000000000000009 0000000043e58010 ffff8800454fbc10 ffffffff813680c4
[17844.699990]  ffff8800454fbc48 ffffffff8108b49d ffff88004eb20000 ffff88004eb20000
[17844.700844]  ffff880062e26000 0000000000000000 0000000000000001 ffff8800454fbc58
[17844.701637] Call Trace:
[17844.725252]  [<ffffffff813680c4>] dump_stack+0x19/0x25
[17844.732693]  [<ffffffff8108b49d>] warn_slowpath_common+0x7d/0xb0
[17844.733855]  [<ffffffff8108b5da>] warn_slowpath_null+0x1a/0x20
[17844.735015]  [<ffffffffa04a27ca>] nfs_direct_select_verf+0x5a/0x70 [nfs]
[17844.735999]  [<ffffffffa04a2b83>] nfs_direct_set_hdr_verf+0x23/0x90 [nfs]
[17844.736846]  [<ffffffffa04a2e17>] nfs_direct_write_completion+0x227/0x260 [nfs]
[17844.737782]  [<ffffffffa04a433c>] nfs_pgio_release+0x1c/0x20 [nfs]
[17844.738597]  [<ffffffffa0502df3>] pnfs_generic_rw_release+0x23/0x30 [nfsv4]
[17844.739486]  [<ffffffffa01cbbea>] rpc_free_task+0x2a/0x70 [sunrpc]
[17844.740326]  [<ffffffffa01cbcd5>] rpc_async_release+0x15/0x20 [sunrpc]
[17844.741173]  [<ffffffff810a387c>] process_one_work+0x21c/0x4c0
[17844.741984]  [<ffffffff810a37cd>] ? process_one_work+0x16d/0x4c0
[17844.742837]  [<ffffffff810a3b6a>] worker_thread+0x4a/0x440
[17844.743639]  [<ffffffff810a3b20>] ? process_one_work+0x4c0/0x4c0
[17844.744399]  [<ffffffff810a3b20>] ? process_one_work+0x4c0/0x4c0
[17844.745176]  [<ffffffff810a8d75>] kthread+0xf5/0x110
[17844.745927]  [<ffffffff810a8c80>] ? kthread_create_on_node+0x240/0x240
[17844.747105]  [<ffffffff8172ce1f>] ret_from_fork+0x3f/0x70
[17844.747856]  [<ffffffff810a8c80>] ? kthread_create_on_node+0x240/0x240
[17844.748642] ---[ end trace 336a2845d42b83f0 ]---

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-09-22 18:09:14 -04:00
Peter Seiderer 98ce94c8df cifs: use server timestamp for ntlmv2 authentication
Linux cifs mount with ntlmssp against an Mac OS X (Yosemite
10.10.5) share fails in case the clocks differ more than +/-2h:

digest-service: digest-request: od failed with 2 proto=ntlmv2
digest-service: digest-request: kdc failed with -1561745592 proto=ntlmv2

Fix this by (re-)using the given server timestamp for the
ntlmv2 authentication (as Windows 7 does).

A related problem was also reported earlier by Namjae Jaen (see below):

Windows machine has extended security feature which refuse to allow
authentication when there is time difference between server time and
client time when ntlmv2 negotiation is used. This problem is prevalent
in embedded enviornment where system time is set to default 1970.

Modern servers send the server timestamp in the TargetInfo Av_Pair
structure in the challenge message [see MS-NLMP 2.2.2.1]
In [MS-NLMP 3.1.5.1.2] it is explicitly mentioned that the client must
use the server provided timestamp if present OR current time if it is
not

Reported-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
2015-09-22 15:24:02 -05:00
Steve French e0ddde9d44 disabling oplocks/leases via module parm enable_oplocks broken for SMB3
leases (oplocks) were always requested for SMB2/SMB3 even when oplocks
disabled in the cifs.ko module.

Signed-off-by: Steve French <steve.french@primarydata.com>
Reviewed-by: Chandrika Srinivasan <chandrika.srinivasan@citrix.com>
CC: Stable <stable@vger.kernel.org>
2015-09-22 15:23:57 -05:00