Commit graph

37461 commits

Author SHA1 Message Date
Linus Torvalds
372b1dbdd1 Merge branch 'for-linus' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
 "Most important fixes in this set include three SMB3 fixes for stable
  (including fix for possible kernel oops), and a workaround to allow
  writes to Mac servers (only cifs dialect, not more current SMB2.1,
  worked to Mac servers).  Also fallocate support added, and lease fix
  from Jeff"

* 'for-linus' of git://git.samba.org/sfrench/cifs-2.6:
  [SMB3] Enable fallocate -z support for SMB3 mounts
  enable fallocate punch hole ("fallocate -p") for SMB3
  Incorrect error returned on setting file compressed on SMB2
  CIFS: Fix wrong directory attributes after rename
  CIFS: Fix SMB2 readdir error handling
  [CIFS] Possible null ptr deref in SMB2_tcon
  [CIFS] Workaround MacOS server problem with SMB2.1 write  response
  cifs: handle lease F_UNLCK requests properly
  Cleanup sparse file support by creating worker function for it
  Add sparse file support to SMB2/SMB3 mounts
  Add missing definitions for CIFS File System Attributes
  cifs: remove unused function cifs_oplock_break_wait
2014-08-20 18:33:21 -05:00
Chin-Tsung Cheng
e6d8fb340f ext3: Count internal journal as bsddf overhead in ext3_statfs
The journal blocks of external journal device should not
be counted as overhead.

Signed-off-by: Chin-Tsung Cheng <chintzung@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2014-08-19 23:16:51 +02:00
Jan Kara
410dd3cf4c isofs: Fix unbounded recursion when processing relocated directories
We did not check relocated directory in any way when processing Rock
Ridge 'CL' tag. Thus a corrupted isofs image can possibly have a CL
entry pointing to another CL entry leading to possibly unbounded
recursion in kernel code and thus stack overflow or deadlocks (if there
is a loop created from CL entries).

Fix the problem by not allowing CL entry to point to a directory entry
with CL entry (such use makes no good sense anyway) and by checking
whether CL entry doesn't point to itself.

CC: stable@vger.kernel.org
Reported-by: Chris Evans <cevans@google.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2014-08-19 18:29:30 +02:00
Chao Yu
85cd083b49 udf: avoid unneeded up_write when fail to add entry in ->symlink
We have released the ->i_data_sem before invoking udf_add_entry(),
so in following error path, we should not release this lock again.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2014-08-19 18:29:30 +02:00
Steve French
30175628bf [SMB3] Enable fallocate -z support for SMB3 mounts
fallocate -z (FALLOC_FL_ZERO_RANGE) can map to SMB3
FSCTL_SET_ZERO_DATA SMB3 FSCTL but FALLOC_FL_ZERO_RANGE
when called without the FALLOC_FL_KEEPSIZE flag set could want
the file size changed so we can not support that subcase unless
the file is cached (and thus we know the file size).

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
2014-08-17 18:16:40 -05:00
Steve French
31742c5a33 enable fallocate punch hole ("fallocate -p") for SMB3
Implement FALLOC_FL_PUNCH_HOLE (which does not change the file size
fortunately so this matches the behavior of the equivalent SMB3
fsctl call) for SMB3 mounts.  This allows "fallocate -p" to work.
It requires that the server support setting files as sparse
(which Windows allows).

Signed-off-by: Steve French <smfrench@gmail.com>
2014-08-17 18:12:38 -05:00
Steve French
ad3829cf1d Incorrect error returned on setting file compressed on SMB2
When the server (for an SMB2 or SMB3 mount) doesn't support
an ioctl (such as setting the compressed flag
on a file) we were incorrectly returning EIO instead
of EOPNOTSUPP, this is confusing e.g. doing chattr +c to a file
on a non-btrfs Samba partition, now the error returned is more
intuitive to the user.  Also fixes error mapping on setting
hardlink to servers which don't support that.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: David Disseldorp <ddiss@suse.de>
2014-08-17 18:12:31 -05:00
Pavel Shilovsky
b46799a8f2 CIFS: Fix wrong directory attributes after rename
When we requests rename we also need to update attributes
of both source and target parent directories. Not doing it
causes generic/309 xfstest to fail on SMB2 mounts. Fix this
by marking these directories for force revalidating.

Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
2014-08-17 05:08:46 -05:00
Pavel Shilovsky
52755808d4 CIFS: Fix SMB2 readdir error handling
SMB2 servers indicates the end of a directory search with
STATUS_NO_MORE_FILE error code that is not processed now.
This causes generic/257 xfstest to fail. Fix this by triggering
the end of search by this error code in SMB2_query_directory.

Also when negotiating CIFS protocol we tell the server to close
the search automatically at the end and there is no need to do
it itself. In the case of SMB2 protocol, we need to close it
explicitly - separate close directory checks for different
protocols.

Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
2014-08-17 05:08:39 -05:00
Steve French
18f39e7be0 [CIFS] Possible null ptr deref in SMB2_tcon
As Raphael Geissert pointed out, tcon_error_exit can dereference tcon
and there is one path in which tcon can be null.

Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org> # v3.7+
Reported-by: Raphael Geissert <geissert@debian.org>
2014-08-17 00:41:02 -05:00
Linus Torvalds
e64df3ebe8 Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs updates from Chris Mason:
 "These are all fixes I'd like to get out to a broader audience.

  The biggest of the bunch is Mark's quota fix, which is also in the
  SUSE kernel, and makes our subvolume quotas dramatically more
  accurate.

  I've been running xfstests with these against your current git
  overnight, but I'm queueing up longer tests as well"

* 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: disable strict file flushes for renames and truncates
  Btrfs: fix csum tree corruption, duplicate and outdated checksums
  Btrfs: Fix memory corruption by ulist_add_merge() on 32bit arch
  Btrfs: fix compressed write corruption on enospc
  btrfs: correctly handle return from ulist_add
  btrfs: qgroup: account shared subtrees during snapshot delete
  Btrfs: read lock extent buffer while walking backrefs
  Btrfs: __btrfs_mod_ref should always use no_quota
  btrfs: adjust statfs calculations according to raid profiles
2014-08-16 09:06:55 -06:00
Linus Torvalds
53b95d6341 File locking related bugfixes for v3.17 (pile #2)
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJT7ey6AAoJEAAOaEEZVoIVgdkQAJfToVhgddVMOweeGo4wqPqM
 lmS35dYVEy+gPfYhCU2Zytgk9yLlmNJeDT7Y+XGe4l15Ax/PDNuWLiRnUKRy1FrU
 l7cbKRAn1L6TqBO2ang5t68Bw7ojUpRoKWKnDyjVAj80mZYRZPWvQOurLeTtra2o
 XLnHbK54F36s07OXwSTZgbh/ffVQ1RMUBU8fy+0Ws3mTAbzO1KuB5Ws4pdt2ysjI
 14pBHO553X0VXAJxGkH66xxblt1o+Q9aBZp7RL0VNtR4bGU4FMvXy+0D5G6h8AGt
 rhl2PWTNKGg8HFgUK+7nCheH4j/0maXo541D3q+sJhbknRhD3n3x7IBvjkm9tdjB
 OgTkAp1mwL21mJP21MOrAil8uwGoSr7qTCngZY6nNWH4L3EkVl27+LlGDtkgBp/n
 BJyhcPbFSh+K4TTD3dg2rEx7wF/npQ6yPOljjvWXKJEm5lx3ZPkK1l1xS3QnVTMe
 pLq+wTZ9v1cU7+9JFWICQwclv4unjIgqxLo7/op5P5KvTWOHFW4cjdwCBPVE1g3a
 WC2c5jdB0Up6Z59aXAN3p5dk8MCy6NA41lkMfJN4AUAIzb6NvNeDBhrcFaHwXowm
 jgCtEPqFN/HqsEwJmhJ7fcIEKYrOCuzeaR5tGuwJ11re/oULGXTgMkrFwgm/YWwu
 esRBAc53/hZg6oo3ipUH
 =09BX
 -----END PGP SIGNATURE-----

Merge tag 'locks-v3.17-2' of git://git.samba.org/jlayton/linux

Pull file locking bugfixes from Jeff Layton:
 "Most of these patches are to fix a long-standing regression that crept
  in when the BKL was removed from the file-locking code.  The code was
  converted to use a conventional spinlock, but some fl_release_private
  ops can block and you can end up sleeping inside the lock.

  There's also a patch to make /proc/locks show delegations as 'DELEG'"

* tag 'locks-v3.17-2' of git://git.samba.org/jlayton/linux:
  locks: update Locking documentation to clarify fl_release_private behavior
  locks: move locks_free_lock calls in do_fcntl_add_lease outside spinlock
  locks: defer freeing locks in locks_delete_lock until after i_lock has been dropped
  locks: don't reuse file_lock in __posix_lock_file
  locks: don't call locks_release_private from locks_copy_lock
  locks: show delegations as "DELEG" in /proc/locks
2014-08-16 08:58:47 -06:00
Linus Torvalds
da06df548e Merge git://git.kvack.org/~bcrl/aio-next
Pull aio updates from Ben LaHaise.

* git://git.kvack.org/~bcrl/aio-next:
  aio: use iovec array rather than the single one
  aio: fix some comments
  aio: use the macro rather than the inline magic number
  aio: remove the needless registration of ring file's private_data
  aio: remove no longer needed preempt_disable()
  aio: kill the misleading rcu read locks in ioctx_add_table() and kill_ioctx()
  aio: change exit_aio() to load mm->ioctx_table once and avoid rcu_read_lock()
2014-08-16 08:56:27 -06:00
Steve French
754789a1c0 [CIFS] Workaround MacOS server problem with SMB2.1 write
response

Writes fail to Mac servers with SMB2.1 mounts (works with cifs though) due
to them sending an incorrect RFC1001 length for the SMB2.1 Write response.
Workaround this problem. MacOS server sends a write response with 3 bytes
of pad beyond the end of the SMB itself.  The RFC1001 length is 3 bytes
more than the sum of the SMB2.1 header length + the write reponse.

Incorporate feedback from Jeff and JRA to allow servers to send
a tcp frame that is even more than three bytes too long
(ie much longer than the SMB2/SMB3 request that it contains) but
we do log it once now. In the earlier version of the patch I had
limited how far off the length field could be before we fail the request.

Signed-off-by: Steve French <smfrench@gmail.com>
2014-08-15 23:49:01 -05:00
Jeff Layton
024408062b cifs: handle lease F_UNLCK requests properly
Currently any F_UNLCK request for a lease just gets back -EAGAIN. Allow
them to go immediately to generic_setlease instead.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Steve French <smfrench@gmail.com>
2014-08-15 23:01:52 -05:00
Steve French
d43cc79343 Cleanup sparse file support by creating worker function for it
Simply move code to new function (for clarity). Function sets or clears
the sparse file attribute flag.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: David Disseldorp <ddiss@samba.org>
2014-08-15 23:01:00 -05:00
Chris Mason
8d875f95da btrfs: disable strict file flushes for renames and truncates
Truncates and renames are often used to replace old versions of a file
with new versions.  Applications often expect this to be an atomic
replacement, even if they haven't done anything to make sure the new
version is fully on disk.

Btrfs has strict flushing in place to make sure that renaming over an
old file with a new file will fully flush out the new file before
allowing the transaction commit with the rename to complete.

This ordering means the commit code needs to be able to lock file pages,
and there are a few paths in the filesystem where we will try to end a
transaction with the page lock held.  It's rare, but these things can
deadlock.

This patch removes the ordered flushes and switches to a best effort
filemap_flush like ext4 uses. It's not perfect, but it should fix the
deadlocks.

Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:42 -07:00
Filipe Manana
27b9a8122f Btrfs: fix csum tree corruption, duplicate and outdated checksums
Under rare circumstances we can end up leaving 2 versions of a checksum
for the same file extent range.

The reason for this is that after calling btrfs_next_leaf we process
slot 0 of the leaf it returns, instead of processing the slot set in
path->slots[0]. Most of the time (by far) path->slots[0] is 0, but after
btrfs_next_leaf() releases the path and before it searches for the next
leaf, another task might cause a split of the next leaf, which migrates
some of its keys to the leaf we were processing before calling
btrfs_next_leaf(). In this case btrfs_next_leaf() returns again the
same leaf but with path->slots[0] having a slot number corresponding
to the first new key it got, that is, a slot number that didn't exist
before calling btrfs_next_leaf(), as the leaf now has more keys than
it had before. So we must really process the returned leaf starting at
path->slots[0] always, as it isn't always 0, and the key at slot 0 can
have an offset much lower than our search offset/bytenr.

For example, consider the following scenario, where we have:

sums->bytenr: 40157184, sums->len: 16384, sums end: 40173568
four 4kb file data blocks with offsets 40157184, 40161280, 40165376, 40169472

  Leaf N:

    slot = 0                           slot = btrfs_header_nritems() - 1
  |-------------------------------------------------------------------|
  | [(CSUM CSUM 39239680), size 8] ... [(CSUM CSUM 40116224), size 4] |
  |-------------------------------------------------------------------|

  Leaf N + 1:

      slot = 0                          slot = btrfs_header_nritems() - 1
  |--------------------------------------------------------------------|
  | [(CSUM CSUM 40161280), size 32] ... [((CSUM CSUM 40615936), size 8 |
  |--------------------------------------------------------------------|

Because we are at the last slot of leaf N, we call btrfs_next_leaf() to
find the next highest key, which releases the current path and then searches
for that next key. However after releasing the path and before finding that
next key, the item at slot 0 of leaf N + 1 gets moved to leaf N, due to a call
to ctree.c:push_leaf_left() (via ctree.c:split_leaf()), and therefore
btrfs_next_leaf() will returns us a path again with leaf N but with the slot
pointing to its new last key (CSUM CSUM 40161280). This new version of leaf N
is then:

    slot = 0                        slot = btrfs_header_nritems() - 2  slot = btrfs_header_nritems() - 1
  |----------------------------------------------------------------------------------------------------|
  | [(CSUM CSUM 39239680), size 8] ... [(CSUM CSUM 40116224), size 4]  [(CSUM CSUM 40161280), size 32] |
  |----------------------------------------------------------------------------------------------------|

And incorrecly using slot 0, makes us set next_offset to 39239680 and we jump
into the "insert:" label, which will set tmp to:

    tmp = min((sums->len - total_bytes) >> blocksize_bits,
        (next_offset - file_key.offset) >> blocksize_bits) =
    min((16384 - 0) >> 12, (39239680 - 40157184) >> 12) =
    min(4, (u64)-917504 = 18446744073708634112 >> 12) = 4

and

   ins_size = csum_size * tmp = 4 * 4 = 16 bytes.

In other words, we insert a new csum item in the tree with key
(CSUM_OBJECTID CSUM_KEY 40157184 = sums->bytenr) that contains the checksums
for all the data (4 blocks of 4096 bytes each = sums->len). Which is wrong,
because the item with key (CSUM CSUM 40161280) (the one that was moved from
leaf N + 1 to the end of leaf N) contains the old checksums of the last 12288
bytes of our data and won't get those old checksums removed.

So this leaves us 2 different checksums for 3 4kb blocks of data in the tree,
and breaks the logical rule:

   Key_N+1.offset >= Key_N.offset + length_of_data_its_checksums_cover

An obvious bad effect of this is that a subsequent csum tree lookup to get
the checksum of any of the blocks with logical offset of 40161280, 40165376
or 40169472 (the last 3 4kb blocks of file data), will get the old checksums.

Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:40 -07:00
Takashi Iwai
4eb1f66dce Btrfs: Fix memory corruption by ulist_add_merge() on 32bit arch
We've got bug reports that btrfs crashes when quota is enabled on
32bit kernel, typically with the Oops like below:
 BUG: unable to handle kernel NULL pointer dereference at 00000004
 IP: [<f9234590>] find_parent_nodes+0x360/0x1380 [btrfs]
 *pde = 00000000
 Oops: 0000 [#1] SMP
 CPU: 0 PID: 151 Comm: kworker/u8:2 Tainted: G S      W 3.15.2-1.gd43d97e-default #1
 Workqueue: btrfs-qgroup-rescan normal_work_helper [btrfs]
 task: f1478130 ti: f147c000 task.ti: f147c000
 EIP: 0060:[<f9234590>] EFLAGS: 00010213 CPU: 0
 EIP is at find_parent_nodes+0x360/0x1380 [btrfs]
 EAX: f147dda8 EBX: f147ddb0 ECX: 00000011 EDX: 00000000
 ESI: 00000000 EDI: f147dda4 EBP: f147ddf8 ESP: f147dd38
  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
 CR0: 8005003b CR2: 00000004 CR3: 00bf3000 CR4: 00000690
 Stack:
  00000000 00000000 f147dda4 00000050 00000001 00000000 00000001 00000050
  00000001 00000000 d3059000 00000001 00000022 000000a8 00000000 00000000
  00000000 000000a1 00000000 00000000 00000001 00000000 00000000 11800000
 Call Trace:
  [<f923564d>] __btrfs_find_all_roots+0x9d/0xf0 [btrfs]
  [<f9237bb1>] btrfs_qgroup_rescan_worker+0x401/0x760 [btrfs]
  [<f9206148>] normal_work_helper+0xc8/0x270 [btrfs]
  [<c025e38b>] process_one_work+0x11b/0x390
  [<c025eea1>] worker_thread+0x101/0x340
  [<c026432b>] kthread+0x9b/0xb0
  [<c0712a71>] ret_from_kernel_thread+0x21/0x30
  [<c0264290>] kthread_create_on_node+0x110/0x110

This indicates a NULL corruption in prefs_delayed list.  The further
investigation and bisection pointed that the call of ulist_add_merge()
results in the corruption.

ulist_add_merge() takes u64 as aux and writes a 64bit value into
old_aux.  The callers of this function in backref.c, however, pass a
pointer of a pointer to old_aux.  That is, the function overwrites
64bit value on 32bit pointer.  This caused a NULL in the adjacent
variable, in this case, prefs_delayed.

Here is a quick attempt to band-aid over this: a new function,
ulist_add_merge_ptr() is introduced to pass/store properly a pointer
value instead of u64.  There are still ugly void ** cast remaining
in the callers because void ** cannot be taken implicitly.  But, it's
safer than explicit cast to u64, anyway.

Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=887046
Cc: <stable@vger.kernel.org> [v3.11+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:19 -07:00
Liu Bo
ce62003f69 Btrfs: fix compressed write corruption on enospc
When failing to allocate space for the whole compressed extent, we'll
fallback to uncompressed IO, but we've forgotten to redirty the pages
which belong to this compressed extent, and these 'clean' pages will
simply skip 'submit' part and go to endio directly, at last we got data
corruption as we write nothing.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Tested-By: Martin Steigerwald <martin@lichtvoll.de>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:18 -07:00
Mark Fasheh
f90e579c2b btrfs: correctly handle return from ulist_add
ulist_add() can return '1' on sucess, which qgroup_subtree_accounting()
doesn't take into account. As a result, that value can be bubbled up to
callers, causing an error to be printed. Fix this by only returning the
value of ulist_add() when it indicates an error.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:16 -07:00
Mark Fasheh
1152651a08 btrfs: qgroup: account shared subtrees during snapshot delete
During its tree walk, btrfs_drop_snapshot() will skip any shared
subtrees it encounters. This is incorrect when we have qgroups
turned on as those subtrees need to have their contents
accounted. In particular, the case we're concerned with is when
removing our snapshot root leaves the subtree with only one root
reference.

In those cases we need to find the last remaining root and add
each extent in the subtree to the corresponding qgroup exclusive
counts.

This patch implements the shared subtree walk and a new qgroup
operation, BTRFS_QGROUP_OPER_SUB_SUBTREE. When an operation of
this type is encountered during qgroup accounting, we search for
any root references to that extent and in the case that we find
only one reference left, we go ahead and do the math on it's
exclusive counts.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:14 -07:00
Filipe Manana
6f7ff6d783 Btrfs: read lock extent buffer while walking backrefs
Before processing the extent buffer, acquire a read lock on it, so
that we're safe against concurrent updates on the extent buffer.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:13 -07:00
Josef Bacik
e339a6b097 Btrfs: __btrfs_mod_ref should always use no_quota
Before I extended the no_quota arg to btrfs_dec/inc_ref because I didn't
understand how snapshot delete was using it and assumed that we needed the
quota operations there.  With Mark's work this has turned out to be not the
case, we _always_ need to use no_quota for btrfs_dec/inc_ref, so just drop the
argument and make __btrfs_mod_ref call it's process function with no_quota set
always.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:11 -07:00
David Sterba
ba7b6e62f4 btrfs: adjust statfs calculations according to raid profiles
This has been discussed in thread:
http://thread.gmane.org/gmane.comp.file-systems.btrfs/32528

and this patch implements this proposal:
http://thread.gmane.org/gmane.comp.file-systems.btrfs/32536

Works fine for "clean" raid profiles where the raid factor correction
does the right job. Otherwise it's pessimistic and may show low space
although there's still some left.

The df nubmers are lightly wrong in case of mixed block groups, but this
is not a major usecase and can be addressed later.

The RAID56 numbers are wrong almost the same way as before and will be
addressed separately.

CC: Hugo Mills <hugo@carfax.org.uk>
CC: cwillu <cwillu@cwillu.com>
CC: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
2014-08-15 07:43:10 -07:00
Jeff Layton
2dfb928f7e locks: move locks_free_lock calls in do_fcntl_add_lease outside spinlock
There's no need to call locks_free_lock here while still holding the
i_lock. Defer that until the lock has been dropped.

Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
2014-08-14 10:07:47 -04:00
Jeff Layton
ed9814d858 locks: defer freeing locks in locks_delete_lock until after i_lock has been dropped
In commit 72f98e7255 (locks: turn lock_flocks into a spinlock), we
moved from using the BKL to a global spinlock. With this change, we lost
the ability to block in the fl_release_private operation.

This is problematic for NFS (and probably some other filesystems as
well). Add a new list_head argument to locks_delete_lock. If that
argument is non-NULL, then queue any locks that we want to free to the
list instead of freeing them.

Then, add a new locks_dispose_list function that will walk such a list
and call locks_free_lock on them after the i_lock has been dropped.

Finally, change all of the callers of locks_delete_lock to pass in a
list_head, except for lease_modify. That function can be called long
after the i_lock has been acquired. Deferring the freeing of a lease
after unlocking it in that function is non-trivial until we overhaul
some of the spinlocking in the lease code.

Currently though, no filesystem that sets fl_release_private supports
leases, so this is not currently a problem. We'll eventually want to
make the same change in the lease code, but it needs a lot more work
before we can reasonably do so.

Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
2014-08-14 10:07:47 -04:00
Jeff Layton
b84d49f944 locks: don't reuse file_lock in __posix_lock_file
Currently in the case where a new file lock completely replaces the old
one, we end up overwriting the existing lock with the new info. This
means that we have to call fl_release_private inside i_lock. Change the
code to instead copy the info to new_fl, insert that lock into the
correct spot and then delete the old lock. In a later patch, we'll defer
the freeing of the old lock until after the i_lock has been dropped.

Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
2014-08-14 10:07:47 -04:00
Linus Torvalds
06b8ab5528 NFS client updates for Linux 3.17
Highlights include:
 
 - Stable fix for a bug in nfs3_list_one_acl()
 - Speed up NFS path walks by supporting LOOKUP_RCU
 - More read/write code cleanups
 - pNFS fixes for layout return on close
 - Fixes for the RCU handling in the rpcsec_gss code
 - More NFS/RDMA fixes
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJT65zoAAoJEGcL54qWCgDyvq8QAJ+OKuC5dpngrZ13i4ZJIcK1
 TJSkWCr44FhYPlrmkLCntsGX6C0376oFEtJ5uqloqK0+/QtvwRNVSQMKaJopKIVY
 mR4En0WwpigxVQdW2lgto6bfOhzMVO+llVdmicEVrU8eeSThATxGNv7rxRzWorvL
 RX3TwBkWSc0kLtPi66VRFQ1z+gg5I0kngyyhsKnLOaHHtpTYP2JDZlRPRkokXPUg
 nmNedmC3JrFFkarroFIfYr54Qit2GW/eI2zVhOwHGCb45j4b2wntZ6wr7LpUdv3A
 OGDBzw59cTpcx3Hij9CFvLYVV9IJJHBNd2MJqdQRtgWFfs+aTkZdk4uilUJCIzZh
 f4BujQAlm/4X1HbPxsSvkCRKga7mesGM7e0sBDPHC1vu0mSaY1cakcj2kQLTpbQ7
 gqa1cR3pZ+4shCq37cLwWU0w1yElYe1c4otjSCttPCrAjXbXJZSFzYnHm8DwKROR
 t+yEDRL5BIXPu1nEtSnD2+xTQ3vUIYXooZWEmqLKgRtBTtPmgSn9Vd8P1OQXmMNo
 VJyFXyjNx5WH06Wbc/jLzQ1/cyhuPmJWWyWMJlVROyv+FXk9DJUFBZuTkpMrIPcF
 NlBXLV1GnA7PzMD9Xt9bwqteERZl6fOUDJLWS9P74kTk5c2kD+m+GaqC/rBTKKXc
 ivr2s7aIDV48jhnwBSVL
 =KE07
 -----END PGP SIGNATURE-----

Merge tag 'nfs-for-3.17-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

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

   - stable fix for a bug in nfs3_list_one_acl()
   - speed up NFS path walks by supporting LOOKUP_RCU
   - more read/write code cleanups
   - pNFS fixes for layout return on close
   - fixes for the RCU handling in the rpcsec_gss code
   - more NFS/RDMA fixes"

* tag 'nfs-for-3.17-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (79 commits)
  nfs: reject changes to resvport and sharecache during remount
  NFS: Avoid infinite loop when RELEASE_LOCKOWNER getting expired error
  SUNRPC: remove all refcounting of groupinfo from rpcauth_lookupcred
  NFS: fix two problems in lookup_revalidate in RCU-walk
  NFS: allow lockless access to access_cache
  NFS: teach nfs_lookup_verify_inode to handle LOOKUP_RCU
  NFS: teach nfs_neg_need_reval to understand LOOKUP_RCU
  NFS: support RCU_WALK in nfs_permission()
  sunrpc/auth: allow lockless (rcu) lookup of credential cache.
  NFS: prepare for RCU-walk support but pushing tests later in code.
  NFS: nfs4_lookup_revalidate: only evaluate parent if it will be used.
  NFS: add checks for returned value of try_module_get()
  nfs: clear_request_commit while holding i_lock
  pnfs: add pnfs_put_lseg_async
  pnfs: find swapped pages on pnfs commit lists too
  nfs: fix comment and add warn_on for PG_INODE_REF
  nfs: check wait_on_bit_lock err in page_group_lock
  sunrpc: remove "ec" argument from encrypt_v2 operation
  sunrpc: clean up sparse endianness warnings in gss_krb5_wrap.c
  sunrpc: clean up sparse endianness warnings in gss_krb5_seal.c
  ...
2014-08-13 18:13:19 -06:00
Linus Torvalds
dc1cc85133 xfs: update for 3.17-rc1
This update contains:
 o conversion of the XFS core to pass negative error numbers
 o restructing of core XFS code that is shared with userspace to fs/xfs/libxfs
 o introduction of sysfs interface for XFS
 o bulkstat refactoring
 o demand driven speculative preallocation removal
 o XFS now always requires 64 bit sectors to be configured
 o metadata verifier changes to ensure CRCs are calculated during log recovery
 o various minor code cleanups
 o miscellaneous bug fixes
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQIcBAABAgAGBQJT6dJvAAoJEK3oKUf0dfodYOYP/jhWGv29OrX958WC+U1kCItb
 WmNV6dSENWgtgYRgdtcxa5ZE0HeEndvN63LOCzAB9VegZK7XjpLob9J2f07gMvP1
 u4vv9LvgLdky/tYxttBYHuyen0hQO0r+esRg/xrawpklKQ3Efofi4MUSbb5ZBDzP
 QvVeNhIDI04A0CoDngWDkV1PpbdwDUjVZFZon36XVDTcSCf/h2B+nekjOVJQpEDC
 qJ9nZWRgAcm4IzZZBqwGt0LJ62Z+Ww8jksevWEnjcXm1xfsltL8gf8o6WOX5iXDR
 PSeoJwVRAxLfiQxnQSENEOeLvKWVXNyC/B10w1H20qZkvQJMsX/Fq0MraBL0Ediu
 0qyZgJsOyoOAvJYXWfUyykUe03dF5/cgrB+RpOLmp4B9lCugCEsQHtjRXEHE1EK2
 +4sHc13I7+SLIAlgySmJdrLe8Kq1vamo0/WD2wH+pdOvNmQ7HJzBUFEj1D83b55a
 DWfBjbz/N5lJW82Vfek2coURJGi/1B87koAtODXWfeM+nbBs47z0dv31G235Boq3
 +Qy2qQdCv05xV+CZn/RAmaudAFFnJEV8L4ADpwqSGfVM72ug0KQF8M5DblG1Q8sb
 xRAQq+krG7K4ui1kPNKcxoHoUIYQUJm0p1aU4V2OAQlikYCCaSgRYGF2xzSVC7j9
 uZd4e4bllsBdPF/Se+8W
 =EUjq
 -----END PGP SIGNATURE-----

Merge tag 'xfs-for-linus-3.17-rc1' of git://oss.sgi.com/xfs/xfs

Pull xfs update from Dave Chinner:
 "This update contains:
   - conversion of the XFS core to pass negative error numbers
   - restructing of core XFS code that is shared with userspace to
     fs/xfs/libxfs
   - introduction of sysfs interface for XFS
   - bulkstat refactoring
   - demand driven speculative preallocation removal
   - XFS now always requires 64 bit sectors to be configured
   - metadata verifier changes to ensure CRCs are calculated during log
     recovery
   - various minor code cleanups
   - miscellaneous bug fixes

  The diffstat is kind of noisy because of the restructuring of the code
  to make kernel/userspace code sharing simpler, along with the XFS wide
  change to use the standard negative error return convention (at last!)"

* tag 'xfs-for-linus-3.17-rc1' of git://oss.sgi.com/xfs/xfs: (45 commits)
  xfs: fix coccinelle warnings
  xfs: flush both inodes in xfs_swap_extents
  xfs: fix swapext ilock deadlock
  xfs: kill xfs_vnode.h
  xfs: kill VN_MAPPED
  xfs: kill VN_CACHED
  xfs: kill VN_DIRTY()
  xfs: dquot recovery needs verifiers
  xfs: quotacheck leaves dquot buffers without verifiers
  xfs: ensure verifiers are attached to recovered buffers
  xfs: catch buffers written without verifiers attached
  xfs: avoid false quotacheck after unclean shutdown
  xfs: fix rounding error of fiemap length parameter
  xfs: introduce xfs_bulkstat_ag_ichunk
  xfs: require 64-bit sector_t
  xfs: fix uflags detection at xfs_fs_rm_xquota
  xfs: remove XFS_IS_OQUOTA_ON macros
  xfs: tidy up xfs_set_inode32
  xfs: allow inode allocations in post-growfs disk space
  xfs: mark xfs_qm_quotacheck as static
  ...
2014-08-13 17:49:53 -06:00
Linus Torvalds
cec997093b Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull quota, reiserfs, UDF updates from Jan Kara:
 "Scalability improvements for quota, a few reiserfs fixes, and couple
  of misc cleanups (udf, ext2)"

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  reiserfs: Fix use after free in journal teardown
  reiserfs: fix corruption introduced by balance_leaf refactor
  udf: avoid redundant memcpy when writing data in ICB
  fs/udf: re-use hex_asc_upper_{hi,lo} macros
  fs/quota: kernel-doc warning fixes
  udf: use linux/uaccess.h
  fs/ext2/super.c: Drop memory allocation cast
  quota: remove dqptr_sem
  quota: simplify remove_inode_dquot_ref()
  quota: avoid unnecessary dqget()/dqput() calls
  quota: protect Q_GETFMT by dqonoff_mutex
2014-08-13 17:45:40 -06:00
Linus Torvalds
8d2d441ac4 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
Pull Ceph updates from Sage Weil:
 "There is a lot of refactoring and hardening of the libceph and rbd
  code here from Ilya that fix various smaller bugs, and a few more
  important fixes with clone overlap.  The main fix is a critical change
  to the request_fn handling to not sleep that was exposed by the recent
  mutex changes (which will also go to the 3.16 stable series).

  Yan Zheng has several fixes in here for CephFS fixing ACL handling,
  time stamps, and request resends when the MDS restarts.

  Finally, there are a few cleanups from Himangi Saraogi based on
  Coccinelle"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (39 commits)
  libceph: set last_piece in ceph_msg_data_pages_cursor_init() correctly
  rbd: remove extra newlines from rbd_warn() messages
  rbd: allocate img_request with GFP_NOIO instead GFP_ATOMIC
  rbd: rework rbd_request_fn()
  ceph: fix kick_requests()
  ceph: fix append mode write
  ceph: fix sizeof(struct tYpO *) typo
  ceph: remove redundant memset(0)
  rbd: take snap_id into account when reading in parent info
  rbd: do not read in parent info before snap context
  rbd: update mapping size only on refresh
  rbd: harden rbd_dev_refresh() and callers a bit
  rbd: split rbd_dev_spec_update() into two functions
  rbd: remove unnecessary asserts in rbd_dev_image_probe()
  rbd: introduce rbd_dev_header_info()
  rbd: show the entire chain of parent images
  ceph: replace comma with a semicolon
  rbd: use rbd_segment_name_free() instead of kfree()
  ceph: check zero length in ceph_sync_read()
  ceph: reset r_resend_mds after receiving -ESTALE
  ...
2014-08-13 17:43:29 -06:00
Linus Torvalds
89838b80bb No significant changes, mostly small fixes here and there. The more important
fixes are:
 
 * UBI deleted list items while iterating the list with 'list_for_each_entry'
 * The UBI block driver did not work properly with very large UBI volumes
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJT6IALAAoJECmIfjd9wqK0yRwP/R4XpNyWZOrK72fvb3M6ucK0
 SK3pu6FNfvOSYibmhOtZWjFbiMkgUd7o8jy+4uJa6PIMRQbKGrH/xvujPzON6GQT
 ZZxeJ7n1O8IAZL/dibqFpEv3NQFjgz1IaLnpktQkkp6rWsXCBYNbvFIywWYgkndt
 1w11QG/TAhkJcA/0Xy/+zmkHeXjOQrVeVMbBN2MMVekWg8JgMNTd9mkWGa1A1oGI
 nuq30nIkUP7LX9T/olFGhjFIeeb/bkmWgpzS4K9PI+hOGGCZvIWj/pu8Jj8DAR54
 UGA7qtMkTjxldvHPnuACsSKNS/N7UGY64kTwcucEcJaN2MXmaBFP8ipI/wtb9bCV
 fUoBt+p470E7iDoQymbM5zNw/HPNh4XWVd2X1oYVftmO70PZ6sWeOKWC+tJn/Aj8
 xsrgd1PcWmuyu399EFW/Il5ItOqfYsNIkVFNzIb1O6Pd8Ylt5eYtuyoPXk5aRA4p
 xZ3ohO3OihvWXwwtCUjforwPy37iaX8vwnuI9xdgnEisTHJWR6PYITvcrwqAIH44
 6PEqINU4zwGTGxOTOWKZxdtPVIuChuwqDyY+7+xQD+LIPQ1/BodozExGiQ0lhAmA
 DDC2Te8q5lpZTz03E8ot9zZHmjQoG+uo10DhEzT5U1ycv9p7dISGfbVucyuKDTw9
 JdUnI8cZ2k6mZi8q6dfA
 =zgqa
 -----END PGP SIGNATURE-----

Merge tag 'upstream-3.17-rc1' of git://git.infradead.org/linux-ubifs

Pull UBI/UBIFS changes from Artem Bityutskiy:
 "No significant changes, mostly small fixes here and there.  The more
  important fixes are:

   - UBI deleted list items while iterating the list with
     'list_for_each_entry'
   - The UBI block driver did not work properly with very large UBI
     volumes"

* tag 'upstream-3.17-rc1' of git://git.infradead.org/linux-ubifs: (21 commits)
  UBIFS: Add log overlap assertions
  Revert "UBIFS: add a log overlap assertion"
  UBI: bugfix in ubi_wl_flush()
  UBI: block: Avoid disk size integer overflow
  UBI: block: Set disk_capacity out of the mutex
  UBI: block: Make ubiblock_resize return something
  UBIFS: add a log overlap assertion
  UBIFS: remove unnecessary check
  UBIFS: remove mst_mutex
  UBIFS: kernel-doc warning fix
  UBI: init_volumes: Ignore volumes with no LEBs
  UBIFS: replace seq_printf by seq_puts
  UBIFS: replace count*size kzalloc by kcalloc
  UBIFS: kernel-doc warning fix
  UBIFS: fix error path in create_default_filesystem()
  UBIFS: fix spelling of "scanned"
  UBIFS: fix some comments
  UBIFS: remove useless @ecc in struct ubifs_scan_leb
  UBIFS: remove useless statements
  UBIFS: Add missing break statements in dbg_chk_pnode()
  ...
2014-08-13 17:42:11 -06:00
Steve French
3d1a3745d8 Add sparse file support to SMB2/SMB3 mounts
Many Linux filesystes make a file "sparse" when extending
a file with ftruncate. This does work for CIFS to Samba
(only) but not for SMB2/SMB3 (to Samba or Windows) since
there is a "set sparse" fsctl which is supposed to be
sent to mark a file as sparse.

This patch marks a file as sparse by sending this simple
set sparse fsctl if it is extended more than 2 pages.
It has been tested to Windows 8.1, Samba and various
SMB2/SMB3 servers which do support setting sparse (and
MacOS which does not appear to support the fsctl yet).
If a server share does not support setting a file
as sparse, then we do not retry setting sparse on that
share.

The disk space savings for sparse files can be quite
large (even more significant on Windows servers than Samba).

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com>
2014-08-13 13:18:35 -05:00
Steve French
8ae31240cc Add missing definitions for CIFS File System Attributes
Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Shirish Pargaonkar <spargaonkar@suse.com>
2014-08-12 23:47:14 -05:00
Jan Kara
01777836c8 reiserfs: Fix use after free in journal teardown
If do_journal_release() races with do_journal_end() which requeues
delayed works for transaction flushing, we can leave work items for
flushing outstanding transactions queued while freeing them. That
results in use after free and possible crash in run_timers_softirq().

Fix the problem by not requeueing works if superblock is being shut down
(MS_ACTIVE not set) and using cancel_delayed_work_sync() in
do_journal_release().

CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
2014-08-12 12:46:30 +02:00
Linus Torvalds
f6f993328b Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs updates from Al Viro:
 "Stuff in here:

   - acct.c fixes and general rework of mnt_pin mechanism.  That allows
     to go for delayed-mntput stuff, which will permit mntput() on deep
     stack without worrying about stack overflows - fs shutdown will
     happen on shallow stack.  IOW, we can do Eric's umount-on-rmdir
     series without introducing tons of stack overflows on new mntput()
     call chains it introduces.
   - Bruce's d_splice_alias() patches
   - more Miklos' rename() stuff.
   - a couple of regression fixes (stable fodder, in the end of branch)
     and a fix for API idiocy in iov_iter.c.

  There definitely will be another pile, maybe even two.  I'd like to
  get Eric's series in this time, but even if we miss it, it'll go right
  in the beginning of for-next in the next cycle - the tricky part of
  prereqs is in this pile"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (40 commits)
  fix copy_tree() regression
  __generic_file_write_iter(): fix handling of sync error after DIO
  switch iov_iter_get_pages() to passing maximal number of pages
  fs: mark __d_obtain_alias static
  dcache: d_splice_alias should detect loops
  exportfs: update Exporting documentation
  dcache: d_find_alias needn't recheck IS_ROOT && DCACHE_DISCONNECTED
  dcache: remove unused d_find_alias parameter
  dcache: d_obtain_alias callers don't all want DISCONNECTED
  dcache: d_splice_alias should ignore DCACHE_DISCONNECTED
  dcache: d_splice_alias mustn't create directory aliases
  dcache: close d_move race in d_splice_alias
  dcache: move d_splice_alias
  namei: trivial fix to vfs_rename_dir comment
  VFS: allow ->d_manage() to declare -EISDIR in rcu_walk mode.
  cifs: support RENAME_NOREPLACE
  hostfs: support rename flags
  shmem: support RENAME_EXCHANGE
  shmem: support RENAME_NOREPLACE
  btrfs: add RENAME_NOREPLACE
  ...
2014-08-11 11:44:11 -07:00
Jeff Layton
566709bd62 locks: don't call locks_release_private from locks_copy_lock
All callers of locks_copy_lock pass in a brand new file_lock struct, so
there's no need to call locks_release_private on it. Replace that with
a warning that fires in the event that we receive a target lock that
doesn't look like it's properly initialized.

Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
2014-08-11 14:24:22 -04:00
Jeff Layton
8144f1f699 locks: show delegations as "DELEG" in /proc/locks
Now that they are a distinct lease type, show them as such.

Cc: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
2014-08-11 13:36:54 -04:00
Al Viro
12a5b5294c fix copy_tree() regression
Since 3.14 we had copy_tree() get the shadowing wrong - if we had one
vfsmount shadowing another (i.e. if A is a slave of B, C is mounted
on A/foo, then D got mounted on B/foo creating D' on A/foo shadowed
by C), copy_tree() of A would make a copy of D' shadow the the copy of
C, not the other way around.

It's easy to fix, fortunately - just make sure that mount follows
the one that shadows it in mnt_child as well as in mnt_hash, and when
copy_tree() decides to attach a new mount, check if the last child
it has added to the same parent should be shadowing the new one.
And if it should, just use the same logics commit_tree() has - put the
new mount into the hash and children lists right after the one that
should shadow it.

Cc: stable@vger.kernel.org [3.14 and later]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-11 12:28:10 -04:00
Vincent Stehlé
e91259f3c7 cifs: remove unused function cifs_oplock_break_wait
Commit 743162013d ("sched: Remove proliferation of wait_on_bit() action
functions") has removed the call to cifs_oplock_break_wait, making this
function unused; remove it.

This fixes the following compilation warning:

  fs/cifs/misc.c:578:1: warning: ‘cifs_oplock_break_wait’ defined but not used [-Wunused-function]

Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Cc: Steve French <sfrench@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
2014-08-11 01:31:03 -05:00
Linus Torvalds
155134fef2 Revert "proc: Point /proc/{mounts,net} at /proc/thread-self/{mounts,net} instead of /proc/self/{mounts,net}"
This reverts commits 344470cac4 and e813244072.

It turns out that the exact path in the symlink matters, if for somewhat
unfortunate reasons: some apparmor configurations don't allow dhclient
access to the per-thread /proc files.  As reported by Jörg Otte:

  audit: type=1400 audit(1407684227.003:28): apparmor="DENIED"
    operation="open" profile="/sbin/dhclient"
    name="/proc/1540/task/1540/net/dev" pid=1540 comm="dhclient"
    requested_mask="r" denied_mask="r" fsuid=0 ouid=0

so we had better revert this for now.  We might be able to work around
this in practice by only using the per-thread symlinks if the thread
isn't the thread group leader, and if the namespaces differ between
threads (which basically never happens).

We'll see. In the meantime, the revert was made to be intentionally easy.

Reported-by: Jörg Otte <jrg.otte@gmail.com>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-10 21:24:59 -07:00
Linus Torvalds
77e40aae76 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull namespace updates from Eric Biederman:
 "This is a bunch of small changes built against 3.16-rc6.  The most
  significant change for users is the first patch which makes setns
  drmatically faster by removing unneded rcu handling.

  The next chunk of changes are so that "mount -o remount,.." will not
  allow the user namespace root to drop flags on a mount set by the
  system wide root.  Aks this forces read-only mounts to stay read-only,
  no-dev mounts to stay no-dev, no-suid mounts to stay no-suid, no-exec
  mounts to stay no exec and it prevents unprivileged users from messing
  with a mounts atime settings.  I have included my test case as the
  last patch in this series so people performing backports can verify
  this change works correctly.

  The next change fixes a bug in NFS that was discovered while auditing
  nsproxy users for the first optimization.  Today you can oops the
  kernel by reading /proc/fs/nfsfs/{servers,volumes} if you are clever
  with pid namespaces.  I rebased and fixed the build of the
  !CONFIG_NFS_FS case yesterday when a build bot caught my typo.  Given
  that no one to my knowledge bases anything on my tree fixing the typo
  in place seems more responsible that requiring a typo-fix to be
  backported as well.

  The last change is a small semantic cleanup introducing
  /proc/thread-self and pointing /proc/mounts and /proc/net at it.  This
  prevents several kinds of problemantic corner cases.  It is a
  user-visible change so it has a minute chance of causing regressions
  so the change to /proc/mounts and /proc/net are individual one line
  commits that can be trivially reverted.  Unfortunately I lost and
  could not find the email of the original reporter so he is not
  credited.  From at least one perspective this change to /proc/net is a
  refgression fix to allow pthread /proc/net uses that were broken by
  the introduction of the network namespace"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  proc: Point /proc/mounts at /proc/thread-self/mounts instead of /proc/self/mounts
  proc: Point /proc/net at /proc/thread-self/net instead of /proc/self/net
  proc: Implement /proc/thread-self to point at the directory of the current thread
  proc: Have net show up under /proc/<tgid>/task/<tid>
  NFS: Fix /proc/fs/nfsfs/servers and /proc/fs/nfsfs/volumes
  mnt: Add tests for unprivileged remount cases that have found to be faulty
  mnt: Change the default remount atime from relatime to the existing value
  mnt: Correct permission checks in do_remount
  mnt: Move the test for MNT_LOCK_READONLY from change_mount_flags into do_remount
  mnt: Only change user settable mount flags in remount
  namespaces: Use task_lock and not rcu to protect nsproxy
2014-08-09 17:10:41 -07:00
Linus Torvalds
0d10c2c170 Merge branch 'for-3.17' of git://linux-nfs.org/~bfields/linux
Pull nfsd updates from Bruce Fields:
 "This includes a major rewrite of the NFSv4 state code, which has
  always depended on a single mutex.  As an example, open creates are no
  longer serialized, fixing a performance regression on NFSv3->NFSv4
  upgrades.  Thanks to Jeff, Trond, and Benny, and to Christoph for
  review.

  Also some RDMA fixes from Chuck Lever and Steve Wise, and
  miscellaneous fixes from Kinglong Mee and others"

* 'for-3.17' of git://linux-nfs.org/~bfields/linux: (167 commits)
  svcrdma: remove rdma_create_qp() failure recovery logic
  nfsd: add some comments to the nfsd4 object definitions
  nfsd: remove the client_mutex and the nfs4_lock/unlock_state wrappers
  nfsd: remove nfs4_lock_state: nfs4_state_shutdown_net
  nfsd: remove nfs4_lock_state: nfs4_laundromat
  nfsd: Remove nfs4_lock_state(): reclaim_complete()
  nfsd: Remove nfs4_lock_state(): setclientid, setclientid_confirm, renew
  nfsd: Remove nfs4_lock_state(): exchange_id, create/destroy_session()
  nfsd: Remove nfs4_lock_state(): nfsd4_open and nfsd4_open_confirm
  nfsd: Remove nfs4_lock_state(): nfsd4_delegreturn()
  nfsd: Remove nfs4_lock_state(): nfsd4_open_downgrade + nfsd4_close
  nfsd: Remove nfs4_lock_state(): nfsd4_lock/locku/lockt()
  nfsd: Remove nfs4_lock_state(): nfsd4_release_lockowner
  nfsd: Remove nfs4_lock_state(): nfsd4_test_stateid/nfsd4_free_stateid
  nfsd: Remove nfs4_lock_state(): nfs4_preprocess_stateid_op()
  nfsd: remove old fault injection infrastructure
  nfsd: add more granular locking to *_delegations fault injectors
  nfsd: add more granular locking to forget_openowners fault injector
  nfsd: add more granular locking to forget_locks fault injector
  nfsd: add a list_head arg to nfsd_foreach_client_lock
  ...
2014-08-09 14:31:18 -07:00
Linus Torvalds
023f78b02c Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
Pull CIFS updates from Steve French:
 "The most visible change in this set is the additional of multi-credit
  support for SMB2/SMB3 which dramatically improves the large file i/o
  performance for these dialects and significantly increases the maximum
  i/o size used on the wire for SMB2/SMB3.

  Also reconnection behavior after network failure is improved"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6: (35 commits)
  Add worker function to set allocation size
  [CIFS] Fix incorrect hex vs. decimal in some debug print statements
  update CIFS TODO list
  Add Pavel to contributor list in cifs AUTHORS file
  Update cifs version
  CIFS: Fix STATUS_CANNOT_DELETE error mapping for SMB2
  CIFS: Optimize readpages in a short read case on reconnects
  CIFS: Optimize cifs_user_read() in a short read case on reconnects
  CIFS: Improve indentation in cifs_user_read()
  CIFS: Fix possible buffer corruption in cifs_user_read()
  CIFS: Count got bytes in read_into_pages()
  CIFS: Use separate var for the number of bytes got in async read
  CIFS: Indicate reconnect with ECONNABORTED error code
  CIFS: Use multicredits for SMB 2.1/3 reads
  CIFS: Fix rsize usage for sync read
  CIFS: Fix rsize usage in user read
  CIFS: Separate page reading from user read
  CIFS: Fix rsize usage in readpages
  CIFS: Separate page search from readpages
  CIFS: Use multicredits for SMB 2.1/3 writes
  ...
2014-08-09 13:03:34 -07:00
Linus Torvalds
c309bfa9b4 MTD updates for 3.17-rc1
AMD-compatible CFI driver:
  - Support OTP programming for Micron M29EW family
  - Increase buffer write timeout, according to detected flash parameter info
 
 NAND
  - Add helpers for retrieving ONFI timing modes
  - GPMI: provide option to disable bad block marker swapping (required for
      Ka-On electronics platforms)
 
 SPI NOR
  - EON EN25QH128 support
  - Support new Flag Status Register (FSR) on a few Micron flash
 
 Common
  - New sysfs entries for bad block and ECC stats
 
 And a few miscellaneous refactorings, cleanups, and driver improvements
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJT5WCXAAoJEFySrpd9RFgt0rwP/1anAulAcve/QzVF9LDFPec8
 jSvK8WWFcHLVb9EvTHtUjRz2RSRNhe0eeyEld3WpdKZZ73VVVaHnGdJv8J8Ys8jn
 kfNBDfgDLFrVzycYCqjQ2gdvidCyrjQgtPP0E/Q/RN6FBur0/rp2WKoJ2FvuT6SS
 kOz5f3TOe+iNtxQoJwkFvs/IjfFMThGs+YMJ8Z9s4LcJHD65T6hF+zDwl8xF2xfG
 b104PsG3I58kJdYjKhRQ2/ol+YCPoVhQorhhuaqeouZum/Hb/2g3rKHVZpAv2n6m
 JWnTpbdJDqGoPFVPyJr5Vm/UYOwxEBSWimuNp+2WN7EsXux1x9JZZl5+ZNUMmb4q
 vxYhIDul2+Sg1lN+ruBe+xi6d8DI8Y5WIc9xJgn3YHLC8YSkiZ11bhQyyeHA9i5h
 jZYKSkN/ERl8iAA4ULD6tsZv4ds8LVI/XOxrcSM7myQ4p8oY5QBxEWEuGPgyH6A6
 qCVkc0TAriSPfcCBvs4o8s2uNUocq7x6ZT1xfdlJ0KVstCmeEJBJnBYwWIXR3tu7
 3+I/bI41Q29ZGV8x5PEGDSgLVDNAJZnfGPuCwdMWuVD7UQuEEOJkCvy8o7C2Fold
 hRXh3SlUICCGDzd0JdNmdt5hPuB0tzsG0YkRoRj2sS30TlHi77nN/m3HYi/JQ4UW
 gA21laizfJ+z7g/5Kabb
 =Wkmz
 -----END PGP SIGNATURE-----

Merge tag 'for-linus-20140808' of git://git.infradead.org/linux-mtd

Pull MTD updates from Brian Norris:
 "AMD-compatible CFI driver:
   - Support OTP programming for Micron M29EW family
   - Increase buffer write timeout, according to detected flash
     parameter info

  NAND
   - Add helpers for retrieving ONFI timing modes
   - GPMI: provide option to disable bad block marker swapping (required
     for Ka-On electronics platforms)

  SPI NOR
   - EON EN25QH128 support
   - Support new Flag Status Register (FSR) on a few Micron flash

  Common
   - New sysfs entries for bad block and ECC stats

  And a few miscellaneous refactorings, cleanups, and driver
  improvements"

* tag 'for-linus-20140808' of git://git.infradead.org/linux-mtd: (31 commits)
  mtd: gpmi: make blockmark swapping optional
  mtd: gpmi: remove line breaks from error messages and improve wording
  mtd: gpmi: remove useless (void *) type casts and spaces between type casts and variables
  mtd: atmel_nand: NFC: support multiple interrupt handling
  mtd: atmel_nand: implement the nfc_device_ready() by checking the R/B bit
  mtd: atmel_nand: add NFC status error check
  mtd: atmel_nand: make ecc parameters same as definition
  mtd: nand: add ONFI timing mode to nand_timings converter
  mtd: nand: define struct nand_timings
  mtd: cfi_cmdset_0002: fix do_write_buffer() timeout error
  mtd: denali: use 8 bytes for READID command
  mtd/ftl: fix the double free of the buffers allocated in build_maps()
  mtd: phram: Fix whitespace issues
  mtd: spi-nor: add support for EON EN25QH128
  mtd: cfi_cmdset_0002: Add support for locking OTP memory
  mtd: cfi_cmdset_0002: Add support for writing OTP memory
  mtd: cfi_cmdset_0002: Invalidate cache after entering/exiting OTP memory
  mtd: cfi_cmdset_0002: Add support for reading OTP
  mtd: spi-nor: add support for flag status register on Micron chips
  mtd: Account for BBT blocks when a partition is being allocated
  ...
2014-08-08 18:13:21 -07:00
David Herrmann
40e041a2c8 shm: add sealing API
If two processes share a common memory region, they usually want some
guarantees to allow safe access. This often includes:
  - one side cannot overwrite data while the other reads it
  - one side cannot shrink the buffer while the other accesses it
  - one side cannot grow the buffer beyond previously set boundaries

If there is a trust-relationship between both parties, there is no need
for policy enforcement.  However, if there's no trust relationship (eg.,
for general-purpose IPC) sharing memory-regions is highly fragile and
often not possible without local copies.  Look at the following two
use-cases:

  1) A graphics client wants to share its rendering-buffer with a
     graphics-server. The memory-region is allocated by the client for
     read/write access and a second FD is passed to the server. While
     scanning out from the memory region, the server has no guarantee that
     the client doesn't shrink the buffer at any time, requiring rather
     cumbersome SIGBUS handling.
  2) A process wants to perform an RPC on another process. To avoid huge
     bandwidth consumption, zero-copy is preferred. After a message is
     assembled in-memory and a FD is passed to the remote side, both sides
     want to be sure that neither modifies this shared copy, anymore. The
     source may have put sensible data into the message without a separate
     copy and the target may want to parse the message inline, to avoid a
     local copy.

While SIGBUS handling, POSIX mandatory locking and MAP_DENYWRITE provide
ways to achieve most of this, the first one is unproportionally ugly to
use in libraries and the latter two are broken/racy or even disabled due
to denial of service attacks.

This patch introduces the concept of SEALING.  If you seal a file, a
specific set of operations is blocked on that file forever.  Unlike locks,
seals can only be set, never removed.  Hence, once you verified a specific
set of seals is set, you're guaranteed that no-one can perform the blocked
operations on this file, anymore.

An initial set of SEALS is introduced by this patch:
  - SHRINK: If SEAL_SHRINK is set, the file in question cannot be reduced
            in size. This affects ftruncate() and open(O_TRUNC).
  - GROW: If SEAL_GROW is set, the file in question cannot be increased
          in size. This affects ftruncate(), fallocate() and write().
  - WRITE: If SEAL_WRITE is set, no write operations (besides resizing)
           are possible. This affects fallocate(PUNCH_HOLE), mmap() and
           write().
  - SEAL: If SEAL_SEAL is set, no further seals can be added to a file.
          This basically prevents the F_ADD_SEAL operation on a file and
          can be set to prevent others from adding further seals that you
          don't want.

The described use-cases can easily use these seals to provide safe use
without any trust-relationship:

  1) The graphics server can verify that a passed file-descriptor has
     SEAL_SHRINK set. This allows safe scanout, while the client is
     allowed to increase buffer size for window-resizing on-the-fly.
     Concurrent writes are explicitly allowed.
  2) For general-purpose IPC, both processes can verify that SEAL_SHRINK,
     SEAL_GROW and SEAL_WRITE are set. This guarantees that neither
     process can modify the data while the other side parses it.
     Furthermore, it guarantees that even with writable FDs passed to the
     peer, it cannot increase the size to hit memory-limits of the source
     process (in case the file-storage is accounted to the source).

The new API is an extension to fcntl(), adding two new commands:
  F_GET_SEALS: Return a bitset describing the seals on the file. This
               can be called on any FD if the underlying file supports
               sealing.
  F_ADD_SEALS: Change the seals of a given file. This requires WRITE
               access to the file and F_SEAL_SEAL may not already be set.
               Furthermore, the underlying file must support sealing and
               there may not be any existing shared mapping of that file.
               Otherwise, EBADF/EPERM is returned.
               The given seals are _added_ to the existing set of seals
               on the file. You cannot remove seals again.

The fcntl() handler is currently specific to shmem and disabled on all
files. A file needs to explicitly support sealing for this interface to
work. A separate syscall is added in a follow-up, which creates files that
support sealing. There is no intention to support this on other
file-systems. Semantics are unclear for non-volatile files and we lack any
use-case right now. Therefore, the implementation is specific to shmem.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Ryan Lortie <desrt@desrt.ca>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Daniel Mack <zonque@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 15:57:31 -07:00
David Herrmann
4bb5f5d939 mm: allow drivers to prevent new writable mappings
This patch (of 6):

The i_mmap_writable field counts existing writable mappings of an
address_space.  To allow drivers to prevent new writable mappings, make
this counter signed and prevent new writable mappings if it is negative.
This is modelled after i_writecount and DENYWRITE.

This will be required by the shmem-sealing infrastructure to prevent any
new writable mappings after the WRITE seal has been set.  In case there
exists a writable mapping, this operation will fail with EBUSY.

Note that we rely on the fact that iff you already own a writable mapping,
you can increase the counter without using the helpers.  This is the same
that we do for i_writecount.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Ryan Lortie <desrt@desrt.ca>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Daniel Mack <zonque@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 15:57:31 -07:00
Fabian Frederick
e0d9bf4cc0 fs/dlm/debug_fs.c: remove unnecessary null test before debugfs_remove
This fixes checkpatch warning:

  WARNING: debugfs_remove(NULL) is safe this check is probably not required

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 15:57:27 -07:00
Yinghai Lu
d97b07c54f initramfs: support initramfs that is bigger than 2GiB
Now with 64bit bzImage and kexec tools, we support ramdisk that size is
bigger than 2g, as we could put it above 4G.

Found compressed initramfs image could not be decompressed properly.  It
turns out that image length is int during decompress detection, and it
will become < 0 when length is more than 2G.  Furthermore, during
decompressing len as int is used for inbuf count, that has problem too.

Change len to long, that should be ok as on 32 bit platform long is
32bits.

Tested with following compressed initramfs image as root with kexec.
	gzip, bzip2, xz, lzma, lzop, lz4.
run time for populate_rootfs():
   size        name       Nehalem-EX  Westmere-EX  Ivybridge-EX
 9034400256 root_img     :   26s           24s          30s
 3561095057 root_img.lz4 :   28s           27s          27s
 3459554629 root_img.lzo :   29s           29s          28s
 3219399480 root_img.gz  :   64s           62s          49s
 2251594592 root_img.xz  :  262s          260s         183s
 2226366598 root_img.lzma:  386s          376s         277s
 2901482513 root_img.bz2 :  635s          599s

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rashika Kheria <rashika.kheria@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Kyungsik Lee <kyungsik.lee@lge.com>
Cc: P J P <ppandit@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: "Daniel M. Weeks" <dan@danweeks.net>
Cc: Alexandre Courbot <acourbot@nvidia.com>
Cc: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 15:57:26 -07:00