commit bfedb589 upstream.

During exec dumpable is cleared if the file that is being executed is
not readable by the user executing the file.  A bug in
ptrace_may_access allows reading the file if the executable happens to
enter into a subordinate user namespace (aka clone(CLONE_NEWUSER),
unshare(CLONE_NEWUSER), or setns(fd, CLONE_NEWUSER).

This problem is fixed with only necessary userspace breakage by adding
a user namespace owner to mm_struct, captured at the time of exec, so
it is clear in which user namespace CAP_SYS_PTRACE must be present in
to be able to safely give read permission to the executable.

The function ptrace_may_access is modified to verify that the ptracer
has CAP_SYS_ADMIN in task->mm->user_ns instead of task->cred->user_ns.
This ensures that if the task changes it's cred into a subordinate
user namespace it does not become ptraceable.

The function ptrace_attach is modified to only set PT_PTRACE_CAP when
CAP_SYS_PTRACE is held over task->mm->user_ns.  The intent of
PT_PTRACE_CAP is to be a flag to note that whatever permission changes
the task might go through the tracer has sufficient permissions for
it not to be an issue.  task->cred->user_ns is always the same
as or descendent of mm->user_ns.  Which guarantees that having
CAP_SYS_PTRACE over mm->user_ns is the worst case for the tasks
credentials.

To prevent regressions mm->dumpable and mm->user_ns are not considered
when a task has no mm.  As simply failing ptrace_may_attach causes
regressions in privileged applications attempting to read things
such as /proc/<pid>/stat
Acked-by: Kees Cook <keescook@chromium.org>
Tested-by: Cyrill Gorcunov <gorcunov@openvz.org>
Fixes: 8409cca7 ("userns: allow ptrace from non-init user namespaces")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit bcc7f5b4 upstream.

bdev->bd_contains is not stable before calling __blkdev_get().
When __blkdev_get() is called on a parition with ->bd_openers == 0
it sets
  bdev->bd_contains = bdev;
which is not correct for a partition.
After a call to __blkdev_get() succeeds, ->bd_openers will be > 0
and then ->bd_contains is stable.

When FMODE_EXCL is used, blkdev_get() calls
   bd_start_claiming() ->  bd_prepare_to_claim() -> bd_may_claim()

This call happens before __blkdev_get() is called, so ->bd_contains
is not stable.  So bd_may_claim() cannot safely use ->bd_contains.
It currently tries to use it, and this can lead to a BUG_ON().

This happens when a whole device is already open with a bd_holder (in
use by dm in my particular example) and two threads race to open a
partition of that device for the first time, one opening with O_EXCL and
one without.

The thread that doesn't use O_EXCL gets through blkdev_get() to
__blkdev_get(), gains the ->bd_mutex, and sets bdev->bd_contains = bdev;

Immediately thereafter the other thread, using FMODE_EXCL, calls
bd_start_claiming() from blkdev_get().  This should fail because the
whole device has a holder, but because bdev->bd_contains == bdev
bd_may_claim() incorrectly reports success.
This thread continues and blocks on bd_mutex.

The first thread then sets bdev->bd_contains correctly and drops the mutex.
The thread using FMODE_EXCL then continues and when it calls bd_may_claim()
again in:
			BUG_ON(!bd_may_claim(bdev, whole, holder));
The BUG_ON fires.

Fix this by removing the dependency on ->bd_contains in
bd_may_claim().  As bd_may_claim() has direct access to the whole
device, it can simply test if the target bdev is the whole device.

Fixes: 6b4517a7 ("block: implement bd_claiming and claiming block")
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 613cc2b6 upstream.

If you have a process that has set itself to be non-dumpable, and it
then undergoes exec(2), any CLOEXEC file descriptors it has open are
"exposed" during a race window between the dumpable flags of the process
being reset for exec(2) and CLOEXEC being applied to the file
descriptors. This can be exploited by a process by attempting to access
/proc/<pid>/fd/... during this window, without requiring CAP_SYS_PTRACE.

The race in question is after set_dumpable has been (for get_link,
though the trace is basically the same for readlink):

[vfs]
-> proc_pid_link_inode_operations.get_link
   -> proc_pid_get_link
      -> proc_fd_access_allowed
         -> ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);

Which will return 0, during the race window and CLOEXEC file descriptors
will still be open during this window because do_close_on_exec has not
been called yet. As a result, the ordering of these calls should be
reversed to avoid this race window.

This is of particular concern to container runtimes, where joining a
PID namespace with file descriptors referring to the host filesystem
can result in security issues (since PRCTL_SET_DUMPABLE doesn't protect
against access of CLOEXEC file descriptors -- file descriptors which may
reference filesystem objects the container shouldn't have access to).

Cc: dev@opencontainers.org
Reported-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit f84df2a6 upstream.

When the user namespace support was merged the need to prevent
ptrace from revealing the contents of an unreadable executable
was overlooked.

Correct this oversight by ensuring that the executed file
or files are in mm->user_ns, by adjusting mm->user_ns.

Use the new function privileged_wrt_inode_uidgid to see if
the executable is a member of the user namespace, and as such
if having CAP_SYS_PTRACE in the user namespace should allow
tracing the executable.  If not update mm->user_ns to
the parent user namespace until an appropriate parent is found.
Reported-by: Jann Horn <jann@thejh.net>
Fixes: 9e4a36ec ("userns: Fail exec for suid and sgid binaries with ids outside our user namespace.")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 69ae5e44 upstream.

Indeed this just make the behavior similar to xfs when process has
fatal signals pending, and it'll make fstests/generic/298 happy.
Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit d5e84fd8 upstream.

Commit 95155585 ("Btrfs: send, don't bug on inconsistent snapshots")
removed some BUG_ON() statements (replacing them with returning errors
to user space and logging error messages) when a snapshot is in an
inconsistent state due to failures to update a delayed inode item (ENOMEM
or ENOSPC) after adding/updating/deleting references, xattrs or file
extent items.

However there is a case, when no errors happen, where a file extent item
can be modified without having the corresponding inode item updated. This
case happens during balance under very specific timings, when relocation
is in the stage where it updates data pointers and a leaf that contains
file extent items is COWed. When that happens file extent items get their
disk_bytenr field updated to a new value that reflects the post relocation
logical address of the extent, without updating their respective inode
items (as there is nothing that needs to be updated on them). This is
performed at relocation.c:replace_file_extents() through
relocation.c:btrfs_reloc_cow_block().

So make an incremental send deal with this case and don't do any processing
for a file extent item that got its disk_bytenr field updated by relocation,
since the extent's data is the same as the one pointed by the file extent
item in the parent snapshot.

After the recent commit mentioned above this case resulted in EIO errors
returned to user space (and an error message logged to dmesg/syslog) when
doing an incremental send, while before it, it resulted in hitting a
BUG_ON leading to the following trace:

[  952.206705] ------------[ cut here ]------------
[  952.206714] kernel BUG at ../fs/btrfs/send.c:5653!
[  952.206719] Internal error: Oops - BUG: 0 [#1] SMP
[  952.209854] Modules linked in: st dm_mod nls_utf8 isofs fuse nf_log_ipv6 xt_pkttype xt_physdev br_netfilter nf_log_ipv4 nf_log_common xt_LOG xt_limit ebtable_filter ebtables af_packet bridge stp llc ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables xfs libcrc32c nls_iso8859_1 nls_cp437 vfat fat joydev aes_ce_blk ablk_helper cryptd snd_intel8x0 aes_ce_cipher snd_ac97_codec ac97_bus snd_pcm ghash_ce sha2_ce sha1_ce snd_timer snd virtio_net soundcore btrfs xor sr_mod cdrom hid_generic usbhid raid6_pq virtio_blk virtio_scsi bochs_drm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm virtio_mmio xhci_pci xhci_hcd usbcore usb_common virtio_pci virtio_ring virtio drm sg efivarfs
[  952.228333] Supported: Yes
[  952.228908] CPU: 0 PID: 12779 Comm: snapperd Not tainted 4.4.14-50-default #1
[  952.230329] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[  952.231683] task: ffff800058e94100 ti: ffff8000d866c000 task.ti: ffff8000d866c000
[  952.233279] PC is at changed_cb+0x9f4/0xa48 [btrfs]
[  952.234375] LR is at changed_cb+0x58/0xa48 [btrfs]
[  952.236552] pc : [<ffff7ffffc39de7c>] lr : [<ffff7ffffc39d4e0>] pstate: 80000145
[  952.238049] sp : ffff8000d866fa20
[  952.238732] x29: ffff8000d866fa20 x28: 0000000000000019
[  952.239840] x27: 00000000000028d5 x26: 00000000000024a2
[  952.241008] x25: 0000000000000002 x24: ffff8000e66e92f0
[  952.242131] x23: ffff8000b8c76800 x22: ffff800092879140
[  952.243238] x21: 0000000000000002 x20: ffff8000d866fb78
[  952.244348] x19: ffff8000b8f8c200 x18: 0000000000002710
[  952.245607] x17: 0000ffff90d42480 x16: ffff800000237dc0
[  952.246719] x15: 0000ffff90de7510 x14: ab000c000a2faf08
[  952.247835] x13: 0000000000577c2b x12: ab000c000b696665
[  952.248981] x11: 2e65726f632f6966 x10: 652d34366d72612f
[  952.250101] x9 : 32627572672f746f x8 : ab000c00092f1671
[  952.251352] x7 : 8000000000577c2b x6 : ffff800053eadf45
[  952.252468] x5 : 0000000000000000 x4 : ffff80005e169494
[  952.253582] x3 : 0000000000000004 x2 : ffff8000d866fb78
[  952.254695] x1 : 000000000003e2a3 x0 : 000000000003e2a4
[  952.255803]
[  952.256150] Process snapperd (pid: 12779, stack limit = 0xffff8000d866c020)
[  952.257516] Stack: (0xffff8000d866fa20 to 0xffff8000d8670000)
[  952.258654] fa20: ffff8000d866fae0 ffff7ffffc308fc0 ffff800092879140 ffff8000e66e92f0
[  952.260219] fa40: 0000000000000035 ffff800055de6000 ffff8000b8c76800 ffff8000d866fb78
[  952.261745] fa60: 0000000000000002 00000000000024a2 00000000000028d5 0000000000000019
[  952.263269] fa80: ffff8000d866fae0 ffff7ffffc3090f0 ffff8000d866fae0 ffff7ffffc309128
[  952.264797] faa0: ffff800092879140 ffff8000e66e92f0 0000000000000035 ffff800055de6000
[  952.268261] fac0: ffff8000b8c76800 ffff8000d866fb78 0000000000000002 0000000000001000
[  952.269822] fae0: ffff8000d866fbc0 ffff7ffffc39ecfc ffff8000b8f8c200 ffff8000b8f8c368
[  952.271368] fb00: ffff8000b8f8c378 ffff800055de6000 0000000000000001 ffff8000ecb17500
[  952.272893] fb20: ffff8000b8c76800 ffff800092879140 ffff800062b6d000 ffff80007a9e2470
[  952.274420] fb40: ffff8000b8f8c208 0000000005784000 ffff8000580a8000 ffff8000b8f8c200
[  952.276088] fb60: ffff7ffffc39d488 00000002b8f8c368 0000000000000000 000000000003e2a4
[  952.280275] fb80: 000000000000006c ffff7ffffc39ec00 000000000003e2a4 000000000000006c
[  952.283219] fba0: ffff8000b8f8c300 0000000000000100 0000000000000001 ffff8000ecb17500
[  952.286166] fbc0: ffff8000d866fcd0 ffff7ffffc3643c0 ffff8000f8842700 0000ffff8ffe9278
[  952.289136] fbe0: 0000000040489426 ffff800055de6000 0000ffff8ffe9278 0000000040489426
[  952.292083] fc00: 000000000000011d 000000000000001d ffff80007a9e4598 ffff80007a9e43e8
[  952.294959] fc20: ffff8000b8c7693f 0000000000003b24 0000000000000019 ffff8000b8f8c218
[  952.301161] fc40: 00000001d866fc70 ffff8000b8c76800 0000000000000128 ffffffffffffff84
[  952.305749] fc60: ffff800058e941ff 0000000000003a58 ffff8000d866fcb0 ffff8000000f7390
[  952.308875] fc80: 000000000000012a 0000000000010290 ffff8000d866fc00 000000000000007b
[  952.311915] fca0: 0000000000010290 ffff800046c1b100 74732d7366727462 000001006d616572
[  952.314937] fcc0: ffff8000fffc4100 cb88537fdc8ba60e ffff8000d866fe10 ffff8000002499e8
[  952.318008] fce0: 0000000040489426 ffff8000f8842700 0000ffff8ffe9278 ffff80007a9e4598
[  952.321321] fd00: 0000ffff8ffe9278 0000000040489426 000000000000011d 000000000000001d
[  952.324280] fd20: ffff80000072c000 ffff8000d866c000 ffff8000d866fda0 ffff8000000e997c
[  952.327156] fd40: ffff8000fffc4180 00000000000031ed ffff8000fffc4180 ffff800046c1b7d4
[  952.329895] fd60: 0000000000000140 0000ffff907ea170 000000000000011d 00000000000000dc
[  952.334641] fd80: ffff80000072c000 ffff8000d866c000 0000000000000000 0000000000000002
[  952.338002] fda0: ffff8000d866fdd0 ffff8000000ebacc ffff800046c1b080 ffff800046c1b7d4
[  952.340724] fdc0: ffff8000d866fdf0 ffff8000000db67c 0000000000000040 ffff800000e69198
[  952.343415] fde0: 0000ffff8ffea790 00000000000031ed ffff8000d866fe20 ffff800000254000
[  952.346101] fe00: 000000000000001d 0000000000000004 ffff8000d866fe90 ffff800000249d3c
[  952.348980] fe20: ffff8000f8842700 0000000000000000 ffff8000f8842701 0000000000000008
[  952.351696] fe40: ffff8000d866fe70 0000000000000008 ffff8000d866fe90 ffff800000249cf8
[  952.354387] fe60: ffff8000f8842700 0000ffff8ffe9170 ffff8000f8842701 0000000000000008
[  952.357083] fe80: 0000ffff8ffe9278 ffff80008ff85500 0000ffff8ffe90c0 ffff800000085c84
[  952.359800] fea0: 0000000000000000 0000ffff8ffe9170 ffffffffffffffff 0000ffff90d473bc
[  952.365351] fec0: 0000000000000000 0000000000000015 0000000000000008 0000000040489426
[  952.369550] fee0: 0000ffff8ffe9278 0000ffff907ea790 0000ffff907ea170 0000ffff907ea790
[  952.372416] ff00: 0000ffff907ea170 0000000000000000 000000000000001d 0000000000000004
[  952.375223] ff20: 0000ffff90a32220 00000000003d0f00 0000ffff907ea0a0 0000ffff8ffe8f30
[  952.378099] ff40: 0000ffff9100f554 0000ffff91147000 0000ffff91117bc0 0000ffff90d473b0
[  952.381115] ff60: 0000ffff9100f620 0000ffff880069b0 0000ffff8ffe9170 0000ffff8ffe91a0
[  952.384003] ff80: 0000ffff8ffe9160 0000ffff8ffe9140 0000ffff88006990 0000ffff8ffe9278
[  952.386860] ffa0: 0000ffff88008a60 0000ffff8ffe9480 0000ffff88014ca0 0000ffff8ffe90c0
[  952.389654] ffc0: 0000ffff910be8e8 0000ffff8ffe90c0 0000ffff90d473bc 0000000000000000
[  952.410986] ffe0: 0000000000000008 000000000000001d 6e2079747265706f 72616d223d656d61
[  952.415497] Call trace:
[  952.417403] [<ffff7ffffc39de7c>] changed_cb+0x9f4/0xa48 [btrfs]
[  952.420023] [<ffff7ffffc308fc0>] btrfs_compare_trees+0x500/0x6b0 [btrfs]
[  952.422759] [<ffff7ffffc39ecfc>] btrfs_ioctl_send+0xb4c/0xe10 [btrfs]
[  952.425601] [<ffff7ffffc3643c0>] btrfs_ioctl+0x374/0x29a4 [btrfs]
[  952.428031] [<ffff8000002499e8>] do_vfs_ioctl+0x33c/0x600
[  952.430360] [<ffff800000249d3c>] SyS_ioctl+0x90/0xa4
[  952.432552] [<ffff800000085c84>] el0_svc_naked+0x38/0x3c
[  952.434803] Code: 2a1503e0 17fffdac b9404282 17ffff28 (d4210000)
[  952.437457] ---[ end trace 9afd7090c466cf15 ]---
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 4867268c upstream.

Really there's lots of things that can go wrong here, kill all the
BUG_ON()'s and replace the logic ones with ASSERT()'s and return EIO
instead.
Signed-off-by: Josef Bacik <jbacik@fb.com>
[ switched to btrfs_err, errors go to common label ]
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 0ccd0528 upstream.

btrfs_show_devname() is using the device_list_mutex, sometimes
a call to blkdev_put() leads vfs calling into this func. So
call blkdev_put() outside of device_list_mutex, as of now.

[  983.284212] ======================================================
[  983.290401] [ INFO: possible circular locking dependency detected ]
[  983.296677] 4.8.0-rc5-ceph-00023-g1b39cec2 #1 Not tainted
[  983.302081] -------------------------------------------------------
[  983.308357] umount/21720 is trying to acquire lock:
[  983.313243]  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff9128ec51>] blkdev_put+0x31/0x150
[  983.321264]
[  983.321264] but task is already holding lock:
[  983.327101]  (&fs_devs->device_list_mutex){+.+...}, at: [<ffffffffc033d6f6>] __btrfs_close_devices+0x46/0x200 [btrfs]
[  983.337839]
[  983.337839] which lock already depends on the new lock.
[  983.337839]
[  983.346024]
[  983.346024] the existing dependency chain (in reverse order) is:
[  983.353512]
-> #4 (&fs_devs->device_list_mutex){+.+...}:
[  983.359096]        [<ffffffff910dfd0c>] lock_acquire+0x1bc/0x1f0
[  983.365143]        [<ffffffff91823125>] mutex_lock_nested+0x65/0x350
[  983.371521]        [<ffffffffc02d8116>] btrfs_show_devname+0x36/0x1f0 [btrfs]
[  983.378710]        [<ffffffff9129523e>] show_vfsmnt+0x4e/0x150
[  983.384593]        [<ffffffff9126ffc7>] m_show+0x17/0x20
[  983.389957]        [<ffffffff91276405>] seq_read+0x2b5/0x3b0
[  983.395669]        [<ffffffff9124c808>] __vfs_read+0x28/0x100
[  983.401464]        [<ffffffff9124eb3b>] vfs_read+0xab/0x150
[  983.407080]        [<ffffffff9124ec32>] SyS_read+0x52/0xb0
[  983.412609]        [<ffffffff91825fc0>] entry_SYSCALL_64_fastpath+0x23/0xc1
[  983.419617]
-> #3 (namespace_sem){++++++}:
[  983.424024]        [<ffffffff910dfd0c>] lock_acquire+0x1bc/0x1f0
[  983.430074]        [<ffffffff918239e9>] down_write+0x49/0x80
[  983.435785]        [<ffffffff91272457>] lock_mount+0x67/0x1c0
[  983.441582]        [<ffffffff91272ab2>] do_add_mount+0x32/0xf0
[  983.447458]        [<ffffffff9127363a>] finish_automount+0x5a/0xc0
[  983.453682]        [<ffffffff91259513>] follow_managed+0x1b3/0x2a0
[  983.459912]        [<ffffffff9125b750>] lookup_fast+0x300/0x350
[  983.465875]        [<ffffffff9125d6e7>] path_openat+0x3a7/0xaa0
[  983.471846]        [<ffffffff9125ef75>] do_filp_open+0x85/0xe0
[  983.477731]        [<ffffffff9124c41c>] do_sys_open+0x14c/0x1f0
[  983.483702]        [<ffffffff9124c4de>] SyS_open+0x1e/0x20
[  983.489240]        [<ffffffff91825fc0>] entry_SYSCALL_64_fastpath+0x23/0xc1
[  983.496254]
-> #2 (&sb->s_type->i_mutex_key#3){+.+.+.}:
[  983.501798]        [<ffffffff910dfd0c>] lock_acquire+0x1bc/0x1f0
[  983.507855]        [<ffffffff918239e9>] down_write+0x49/0x80
[  983.513558]        [<ffffffff91366237>] start_creating+0x87/0x100
[  983.519703]        [<ffffffff91366647>] debugfs_create_dir+0x17/0x100
[  983.526195]        [<ffffffff911df153>] bdi_register+0x93/0x210
[  983.532165]        [<ffffffff911df313>] bdi_register_owner+0x43/0x70
[  983.538570]        [<ffffffff914080fb>] device_add_disk+0x1fb/0x450
[  983.544888]        [<ffffffff91580226>] loop_add+0x1e6/0x290
[  983.550596]        [<ffffffff91fec358>] loop_init+0x10b/0x14f
[  983.556394]        [<ffffffff91002207>] do_one_initcall+0xa7/0x180
[  983.562618]        [<ffffffff91f932e0>] kernel_init_freeable+0x1cc/0x266
[  983.569370]        [<ffffffff918174be>] kernel_init+0xe/0x100
[  983.575166]        [<ffffffff9182620f>] ret_from_fork+0x1f/0x40
[  983.581131]
-> #1 (loop_index_mutex){+.+.+.}:
[  983.585801]        [<ffffffff910dfd0c>] lock_acquire+0x1bc/0x1f0
[  983.591858]        [<ffffffff91823125>] mutex_lock_nested+0x65/0x350
[  983.598256]        [<ffffffff9157ed3f>] lo_open+0x1f/0x60
[  983.603704]        [<ffffffff9128eec3>] __blkdev_get+0x123/0x400
[  983.609757]        [<ffffffff9128f4ea>] blkdev_get+0x34a/0x350
[  983.615639]        [<ffffffff9128f554>] blkdev_open+0x64/0x80
[  983.621428]        [<ffffffff9124aff6>] do_dentry_open+0x1c6/0x2d0
[  983.627651]        [<ffffffff9124c029>] vfs_open+0x69/0x80
[  983.633181]        [<ffffffff9125db74>] path_openat+0x834/0xaa0
[  983.639152]        [<ffffffff9125ef75>] do_filp_open+0x85/0xe0
[  983.645035]        [<ffffffff9124c41c>] do_sys_open+0x14c/0x1f0
[  983.650999]        [<ffffffff9124c4de>] SyS_open+0x1e/0x20
[  983.656535]        [<ffffffff91825fc0>] entry_SYSCALL_64_fastpath+0x23/0xc1
[  983.663541]
-> #0 (&bdev->bd_mutex){+.+.+.}:
[  983.668107]        [<ffffffff910def43>] __lock_acquire+0x1003/0x17b0
[  983.674510]        [<ffffffff910dfd0c>] lock_acquire+0x1bc/0x1f0
[  983.680561]        [<ffffffff91823125>] mutex_lock_nested+0x65/0x350
[  983.686967]        [<ffffffff9128ec51>] blkdev_put+0x31/0x150
[  983.692761]        [<ffffffffc033481f>] btrfs_close_bdev+0x4f/0x60 [btrfs]
[  983.699699]        [<ffffffffc033d77b>] __btrfs_close_devices+0xcb/0x200 [btrfs]
[  983.707178]        [<ffffffffc033d8db>] btrfs_close_devices+0x2b/0xa0 [btrfs]
[  983.714380]        [<ffffffffc03081c5>] close_ctree+0x265/0x340 [btrfs]
[  983.721061]        [<ffffffffc02d7959>] btrfs_put_super+0x19/0x20 [btrfs]
[  983.727908]        [<ffffffff91250e2f>] generic_shutdown_super+0x6f/0x100
[  983.734744]        [<ffffffff91250f56>] kill_anon_super+0x16/0x30
[  983.740888]        [<ffffffffc02da97e>] btrfs_kill_super+0x1e/0x130 [btrfs]
[  983.747909]        [<ffffffff91250fe9>] deactivate_locked_super+0x49/0x80
[  983.754745]        [<ffffffff912515fd>] deactivate_super+0x5d/0x70
[  983.760977]        [<ffffffff91270a1c>] cleanup_mnt+0x5c/0x80
[  983.766773]        [<ffffffff91270a92>] __cleanup_mnt+0x12/0x20
[  983.772738]        [<ffffffff910aa2fe>] task_work_run+0x7e/0xc0
[  983.778708]        [<ffffffff91081b5a>] exit_to_usermode_loop+0x7e/0xb4
[  983.785373]        [<ffffffff910039eb>] syscall_return_slowpath+0xbb/0xd0
[  983.792212]        [<ffffffff9182605c>] entry_SYSCALL_64_fastpath+0xbf/0xc1
[  983.799225]
[  983.799225] other info that might help us debug this:
[  983.799225]
[  983.807291] Chain exists of:
  &bdev->bd_mutex --> namespace_sem --> &fs_devs->device_list_mutex

[  983.816521]  Possible unsafe locking scenario:
[  983.816521]
[  983.822489]        CPU0                    CPU1
[  983.827043]        ----                    ----
[  983.831599]   lock(&fs_devs->device_list_mutex);
[  983.836289]                                lock(namespace_sem);
[  983.842268]                                lock(&fs_devs->device_list_mutex);
[  983.849478]   lock(&bdev->bd_mutex);
[  983.853127]
[  983.853127]  *** DEADLOCK ***
[  983.853127]
[  983.859113] 3 locks held by umount/21720:
[  983.863145]  #0:  (&type->s_umount_key#35){++++..}, at: [<ffffffff912515f5>] deactivate_super+0x55/0x70
[  983.872713]  #1:  (uuid_mutex){+.+.+.}, at: [<ffffffffc033d8d3>] btrfs_close_devices+0x23/0xa0 [btrfs]
[  983.882206]  #2:  (&fs_devs->device_list_mutex){+.+...}, at: [<ffffffffc033d6f6>] __btrfs_close_devices+0x46/0x200 [btrfs]
[  983.893422]
[  983.893422] stack backtrace:
[  983.897824] CPU: 6 PID: 21720 Comm: umount Not tainted 4.8.0-rc5-ceph-00023-g1b39cec2 #1
[  983.905958] Hardware name: Supermicro SYS-5018R-WR/X10SRW-F, BIOS 1.0c 09/07/2015
[  983.913492]  0000000000000000 ffff8c8a53c17a38 ffffffff91429521 ffffffff9260f4f0
[  983.921018]  ffffffff92642760 ffff8c8a53c17a88 ffffffff911b2b04 0000000000000050
[  983.928542]  ffffffff9237d620 ffff8c8a5294aee0 ffff8c8a5294aeb8 ffff8c8a5294aee0
[  983.936072] Call Trace:
[  983.938545]  [<ffffffff91429521>] dump_stack+0x85/0xc4
[  983.943715]  [<ffffffff911b2b04>] print_circular_bug+0x1fb/0x20c
[  983.949748]  [<ffffffff910def43>] __lock_acquire+0x1003/0x17b0
[  983.955613]  [<ffffffff910dfd0c>] lock_acquire+0x1bc/0x1f0
[  983.961123]  [<ffffffff9128ec51>] ? blkdev_put+0x31/0x150
[  983.966550]  [<ffffffff91823125>] mutex_lock_nested+0x65/0x350
[  983.972407]  [<ffffffff9128ec51>] ? blkdev_put+0x31/0x150
[  983.977832]  [<ffffffff9128ec51>] blkdev_put+0x31/0x150
[  983.983101]  [<ffffffffc033481f>] btrfs_close_bdev+0x4f/0x60 [btrfs]
[  983.989500]  [<ffffffffc033d77b>] __btrfs_close_devices+0xcb/0x200 [btrfs]
[  983.996415]  [<ffffffffc033d8db>] btrfs_close_devices+0x2b/0xa0 [btrfs]
[  984.003068]  [<ffffffffc03081c5>] close_ctree+0x265/0x340 [btrfs]
[  984.009189]  [<ffffffff9126cc5e>] ? evict_inodes+0x15e/0x170
[  984.014881]  [<ffffffffc02d7959>] btrfs_put_super+0x19/0x20 [btrfs]
[  984.021176]  [<ffffffff91250e2f>] generic_shutdown_super+0x6f/0x100
[  984.027476]  [<ffffffff91250f56>] kill_anon_super+0x16/0x30
[  984.033082]  [<ffffffffc02da97e>] btrfs_kill_super+0x1e/0x130 [btrfs]
[  984.039548]  [<ffffffff91250fe9>] deactivate_locked_super+0x49/0x80
[  984.045839]  [<ffffffff912515fd>] deactivate_super+0x5d/0x70
[  984.051525]  [<ffffffff91270a1c>] cleanup_mnt+0x5c/0x80
[  984.056774]  [<ffffffff91270a92>] __cleanup_mnt+0x12/0x20
[  984.062201]  [<ffffffff910aa2fe>] task_work_run+0x7e/0xc0
[  984.067625]  [<ffffffff91081b5a>] exit_to_usermode_loop+0x7e/0xb4
[  984.073747]  [<ffffffff910039eb>] syscall_return_slowpath+0xbb/0xd0
[  984.080038]  [<ffffffff9182605c>] entry_SYSCALL_64_fastpath+0xbf/0xc1
Reported-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit a958eab0 upstream.

The extent buffer 'next' needs to be free'd conditionally.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit cea67ab9 upstream.

btrfs_rm_device frees the block device but then re-opens it using
the saved device name.  A race exists between the close and the
re-open that allows the block size to be changed.  The result
is getting stuck forever in the reclaim loop in __getblk_slow.

This patch moves the superblock cleanup before closing the block
device, which is also consistent with other callers.  We also don't
need a private copy of dev_name as the whole routine operates under
the uuid_mutex.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 6bdf131f upstream.

We don't track the reloc roots in any sort of normal way, so the only way the
root/commit_root nodes get free'd is if the relocation finishes successfully and
the reloc root is deleted.  Fix this by free'ing them in free_reloc_roots.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 3561b9db upstream.

When relocating tree blocks, we firstly get block information from
back references in the extent tree, we then search fs tree to try to
find all parents of a block.

However, if fs tree is corrupted, eg. if there're some missing
items, we could come across these WARN_ONs and BUG_ONs.

This makes us print some error messages and return gracefully
from balance.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 49303381 upstream.

Currently we allow inconsistence about mixed flag
 (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA).

We'd get ENOSPC if block group has mixed flag and btrfs doesn't.
If that happens, we have one space_info with mixed flag and another
space_info only with BTRFS_BLOCK_GROUP_METADATA, and
global_block_rsv.space_info points to the latter one, but all bytes
from block_group contributes to the mixed space_info, thus all the
allocation will fail with ENOSPC.

This adds a check for the above case.
Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
[ updated message ]
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 2571e739 upstream.

So we can read a btree block via readahead or intentional read,
and we can end up with a memory leak when something happens as
follows,
1) readahead starts to read block A but does not wait for read
   completion,
2) btree_readpage_end_io_hook finds that block A is corrupted,
   and it needs to clear all block A's pages' uptodate bit.
3) meanwhile an intentional read kicks in and checks block A's
   pages' uptodate to decide which page needs to be read.
4) when some pages have the uptodate bit during 3)'s check so
   3) doesn't count them for eb->io_pages, but they are later
   cleared by 2) so we has to readpage on the page, we get
   the wrong eb->io_pages which results in a memory leak of
   this block.

This fixes the problem by firstly getting all pages's locking and
then checking pages' uptodate bit.

   t1(readahead)                              t2(readahead endio)                                       t3(the following read)
read_extent_buffer_pages                    end_bio_extent_readpage
  for pg in eb:                                for page 0,1,2 in eb:
      if pg is uptodate:                           btree_readpage_end_io_hook(pg)
          num_reads++                              if uptodate:
  eb->io_pages = num_reads                             SetPageUptodate(pg)              _______________
  for pg in eb:                                for page 3 in eb:                                     read_extent_buffer_pages
       if pg is NOT uptodate:                      btree_readpage_end_io_hook(pg)                       for pg in eb:
           __extent_read_full_page(pg)                 sanity check reports something wrong                 if pg is uptodate:
                                                       clear_extent_buffer_uptodate(eb)                         num_reads++
                                                           for pg in eb:                                eb->io_pages = num_reads
                                                               ClearPageUptodate(page)  _______________
                                                                                                        for pg in eb:
                                                                                                            if pg is NOT uptodate:
                                                                                                                __extent_read_full_page(pg)

So t3's eb->io_pages is not consistent with the number of pages it's reading,
and during endio(), atomic_dec_and_test(&eb->io_pages) will get a negative
number so that we're not able to free the eb.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 035cd485 upstream.

The OMAP36xx DPLL5, driving EHCI USB, can be subject to a long-term
frequency drift. The frequency drift magnitude depends on the VCO update
rate, which is inversely proportional to the PLL divider. The kernel
DPLL configuration code results in a high value for the divider, leading
to a long term drift high enough to cause USB transmission errors. In
the worst case the USB PHY's ULPI interface can stop responding,
breaking USB operation completely. This manifests itself on the
Beagleboard xM by the LAN9514 reporting 'Cannot enable port 2. Maybe the
cable is bad?' in the kernel log.

Errata sprz319 advisory 2.1 documents PLL values that minimize the
drift. Use them automatically when DPLL5 is used for USB operation,
which we detect based on the requested clock rate. The clock framework
will still compute the PLL parameters and resulting rate as usual, but
the PLL M and N values will then be overridden. This can result in the
effective clock rate being slightly different than the rate cached by
the clock framework, but won't cause any adverse effect to USB
operation.
Signed-off-by: Richard Watts <rrw@kynesim.co.uk>
[Upported from v3.2 to v4.9]
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Adam Ford <aford173@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 5e0ad0d8 upstream.

Commit [64047d7f ALSA: hda - ignore the assoc and seq when comparing
pin configurations] intented to ignore both seq and assoc at pin
comparing, but it only ignored seq. So that commit may still fail to
match pins on some machines.
Change the bitmask to also ignore assoc.

v2: Use macro to do bit masking.

Thanks to Hui Wang for the analysis.

Fixes: 64047d7f ("ALSA: hda - ignore the assoc and seq when comparing...")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit f73cd43a upstream.

HP Z1 Gen3 AiO with Conexant codec doesn't give an unsolicited event
to the headset mic pin upon the jack plugging, it reports only to the
headphone pin.  It results in the missing mic switching.  Let's fix up
by simply gating the jack event.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 989dbe4a upstream.

This group of new pins is not in the pin quirk table yet, adding
them to the pin quirk table to fix the headset-mic problem.
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 64047d7f upstream.

More and more pin configurations have been adding to the pin quirk
table, lots of them are only different from assoc and seq, but they
all apply to the same QUIRK_FIXUP, if we don't compare assoc and seq
when matching pin configurations, it will greatly reduce the pin
quirk table size.

We have tested this change on a couple of Dell laptops, it worked
well.
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit b5337cfe upstream.

I'm using an Alienware 15 R2 and had to use the alienware quirks to
get my headphone output working.

I fixed it by adding, SND_PCI_QUIRK(0x1028, 0x0708, "Alienware 15 R2
2016", QUIRK_ALIENWARE) to the patch.
Signed-off-by: Sven Hahne <hahne@zeitkunst.eu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 995c6a7f upstream.

Sampling rate changes after first set one are not reflected to the
hardware, while driver and ALSA think the rate has been changed.

Fix the problem by properly stopping the interface at the beginning of
prepare call, allowing new rate to be set to the hardware. This keeps
the hardware in sync with the driver.
Signed-off-by: Jussi Laako <jussi@sonarnerd.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 82ffb6fc upstream.

The Logitech QuickCam Communicate Deluxe/S7500 microphone fails with the
following warning.

[    6.778995] usb 2-1.2.2.2: Warning! Unlikely big volume range (=3072),
cval->res is probably wrong.
[    6.778996] usb 2-1.2.2.2: [5] FU [Mic Capture Volume] ch = 1, val =
4608/7680/1

Adding it to the list of devices in volume_control_quirks makes it work
properly, fixing related typo.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 3e448e13 upstream.

ep_list inside gadget structure doesn't contain ep0.
It is stored separately in ep0 field.

This causes an urb hang if gadget driver decides to
delay setup handling. On host side this is visible as
timeout error when setting configuration.

This bug can be reproduced using for example any gadget
with mass storage function.

Fixes: abdb2957 ("usbip: vudc: Add vudc_transfer")
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit ccdb6be9 upstream.

The UHCI controllers in Intel chipsets rely on a platform-specific non-PME
mechanism for wakeup signalling.  They can generate wakeup signals even
though they don't support PME.

We need to let the USB core know this so that it will enable runtime
suspend for UHCI controllers.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit e8f29bb7 upstream.

usb_endpoint_maxp() returns wMaxPacketSize in its
raw form. Without taking into consideration that it
also contains other bits reserved for isochronous
endpoints.

This patch fixes one occasion where this is a
problem by making sure that we initialize
ep->maxpacket only with lower 10 bits of the value
returned by usb_endpoint_maxp(). Note that seperate
patches will be necessary to audit all call sites of
usb_endpoint_maxp() and make sure that
usb_endpoint_maxp() only returns lower 10 bits of
wMaxPacketSize.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit f1d3861d upstream.

The current error handling flow uses incorrect goto label, fix it

Fixes: d12a8727 ("usb: gadget: function: Remove redundant usb_free_all_descriptors")
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 37be6676 upstream.

USB-3 does not have any link state that will avoid negotiating a connection
with a plugged-in cable but will signal the host when the cable is
unplugged.

For USB-3 we used to first set the link to Disabled, then to RxDdetect to
be able to detect cable connects or disconnects. But in RxDetect the
connected device is detected again and eventually enabled.

Instead set the link into U3 and disable remote wakeups for the device.
This is what Windows does, and what Alan Stern suggested.

Cc: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 6b9018d4 upstream.

In case of High-Speed, High-Bandwidth endpoints, we
need to tell DWC3 that we have more than one packet
per interval. We do that by setting PCM1 field of
Isochronous-First TRB.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 30121604 upstream.

Add device-id entry for GW Instek AFG-125, which has a byte swapped
bInterfaceSubClass (0x20).
Signed-off-by: Nathaniel Quillin <ndq@google.com>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 6774d5f5 upstream.

Kill urbs and disable read before returning from open on failure to
retrieve the line state.

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit d8a12b71 upstream.

Adding registration for 3G modem DWM-158 in usb-serial-option
Signed-off-by: Giuseppe Lippolis <giu.lippolis@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 5b09eff0 upstream.

This patch adds support for PIDs 0x1040, 0x1041 of Telit LE922A.

Since the interface positions are the same than the ones used
for other Telit compositions, previous defined blacklists are used.
Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 8d9eddad upstream.

We were setting the qgroup_rescan_running flag to true only after the
rescan worker started (which is a task run by a queue). So if a user
space task starts a rescan and immediately after asks to wait for the
rescan worker to finish, this second call might happen before the rescan
worker task starts running, in which case the rescan wait ioctl returns
immediatley, not waiting for the rescan worker to finish.

This was making the fstest btrfs/022 fail very often.

Fixes: d2c609b8 (btrfs: properly track when rescan worker is running)
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit f177d739 upstream.

We can not simply use the owner field from an extent buffer's header to
get the id of the respective tree when the extent buffer is from a
relocation tree. When we create the root for a relocation tree we leave
(on purpose) the owner field with the same value as the subvolume's tree
root (we do this at ctree.c:btrfs_copy_root()). So we must ignore extent
buffers from relocation trees, which have the BTRFS_HEADER_FLAG_RELOC
flag set, because otherwise we will always consider the extent buffer
as not being the root of the tree (the root of original subvolume tree
is always different from the root of the respective relocation tree).

This lead to assertion failures when running with the integrity checker
enabled (CONFIG_BTRFS_FS_CHECK_INTEGRITY=y) such as the following:

[  643.393409] BTRFS critical (device sdg): corrupt leaf, non-root leaf's nritems is 0: block=38506496, root=260, slot=0
[  643.397609] BTRFS info (device sdg): leaf 38506496 total ptrs 0 free space 3995
[  643.407075] assertion failed: 0, file: fs/btrfs/disk-io.c, line: 4078
[  643.408425] ------------[ cut here ]------------
[  643.409112] kernel BUG at fs/btrfs/ctree.h:3419!
[  643.409773] invalid opcode: 0000 [#1] PREEMPT SMP
[  643.410447] Modules linked in: dm_flakey dm_mod crc32c_generic btrfs xor raid6_pq ppdev psmouse acpi_cpufreq parport_pc evdev parport tpm_tis tpm_tis_core pcspkr serio_raw i2c_piix4 sg tpm i2c_core button processor loop autofs4 ext4 crc16 jbd2 mbcache sr_mod cdrom sd_mod ata_generic virtio_scsi ata_piix libata virtio_pci virtio_ring scsi_mod virtio e1000 floppy
[  643.414356] CPU: 11 PID: 32726 Comm: btrfs Not tainted 4.8.0-rc8-btrfs-next-35+ #1
[  643.414356] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014
[  643.414356] task: ffff880145e95b00 task.stack: ffff88014826c000
[  643.414356] RIP: 0010:[<ffffffffa0352759>]  [<ffffffffa0352759>] assfail.constprop.41+0x1c/0x1e [btrfs]
[  643.414356] RSP: 0018:ffff88014826fa28  EFLAGS: 00010292
[  643.414356] RAX: 0000000000000039 RBX: ffff88014e2d7c38 RCX: 0000000000000001
[  643.414356] RDX: ffff88023f4d2f58 RSI: ffffffff81806c63 RDI: 00000000ffffffff
[  643.414356] RBP: ffff88014826fa28 R08: 0000000000000001 R09: 0000000000000000
[  643.414356] R10: ffff88014826f918 R11: ffffffff82f3c5ed R12: ffff880172910000
[  643.414356] R13: ffff880233992230 R14: ffff8801a68a3310 R15: fffffffffffffff8
[  643.414356] FS:  00007f9ca305e8c0(0000) GS:ffff88023f4c0000(0000) knlGS:0000000000000000
[  643.414356] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  643.414356] CR2: 00007f9ca3071000 CR3: 000000015d01b000 CR4: 00000000000006e0
[  643.414356] Stack:
[  643.414356]  ffff88014826fa50 ffffffffa02d655a 000000000000000a ffff88014e2d7c38
[  643.414356]  0000000000000000 ffff88014826faa8 ffffffffa02b72f3 ffff88014826fab8
[  643.414356]  00ffffffa03228e4 0000000000000000 0000000000000000 ffff8801bbd4e000
[  643.414356] Call Trace:
[  643.414356]  [<ffffffffa02d655a>] btrfs_mark_buffer_dirty+0xdf/0xe5 [btrfs]
[  643.414356]  [<ffffffffa02b72f3>] btrfs_copy_root+0x18a/0x1d1 [btrfs]
[  643.414356]  [<ffffffffa0322921>] create_reloc_root+0x72/0x1ba [btrfs]
[  643.414356]  [<ffffffffa03267c2>] btrfs_init_reloc_root+0x7b/0xa7 [btrfs]
[  643.414356]  [<ffffffffa02d9e44>] record_root_in_trans+0xdf/0xed [btrfs]
[  643.414356]  [<ffffffffa02db04e>] btrfs_record_root_in_trans+0x50/0x6a [btrfs]
[  643.414356]  [<ffffffffa030ad2b>] create_subvol+0x472/0x773 [btrfs]
[  643.414356]  [<ffffffffa030b406>] btrfs_mksubvol+0x3da/0x463 [btrfs]
[  643.414356]  [<ffffffffa030b406>] ? btrfs_mksubvol+0x3da/0x463 [btrfs]
[  643.414356]  [<ffffffff810781ac>] ? preempt_count_add+0x65/0x68
[  643.414356]  [<ffffffff811a6e97>] ? __mnt_want_write+0x62/0x77
[  643.414356]  [<ffffffffa030b55d>] btrfs_ioctl_snap_create_transid+0xce/0x187 [btrfs]
[  643.414356]  [<ffffffffa030b67d>] btrfs_ioctl_snap_create+0x67/0x81 [btrfs]
[  643.414356]  [<ffffffffa030ecfd>] btrfs_ioctl+0x508/0x20dd [btrfs]
[  643.414356]  [<ffffffff81293e39>] ? __this_cpu_preempt_check+0x13/0x15
[  643.414356]  [<ffffffff81155eca>] ? handle_mm_fault+0x976/0x9ab
[  643.414356]  [<ffffffff81091300>] ? arch_local_irq_save+0x9/0xc
[  643.414356]  [<ffffffff8119a2b0>] vfs_ioctl+0x18/0x34
[  643.414356]  [<ffffffff8119a8e8>] do_vfs_ioctl+0x581/0x600
[  643.414356]  [<ffffffff814b9552>] ? entry_SYSCALL_64_fastpath+0x5/0xa8
[  643.414356]  [<ffffffff81093fe9>] ? trace_hardirqs_on_caller+0x17b/0x197
[  643.414356]  [<ffffffff8119a9be>] SyS_ioctl+0x57/0x79
[  643.414356]  [<ffffffff814b9565>] entry_SYSCALL_64_fastpath+0x18/0xa8
[  643.414356]  [<ffffffff81091b08>] ? trace_hardirqs_off_caller+0x3f/0xaa
[  643.414356] Code: 89 83 88 00 00 00 31 c0 5b 41 5c 41 5d 5d c3 55 89 f1 48 c7 c2 98 bc 35 a0 48 89 fe 48 c7 c7 05 be 35 a0 48 89 e5 e8 13 46 dd e0 <0f> 0b 55 89 f1 48 c7 c2 9f d3 35 a0 48 89 fe 48 c7 c7 7a d5 35
[  643.414356] RIP  [<ffffffffa0352759>] assfail.constprop.41+0x1c/0x1e [btrfs]
[  643.414356]  RSP <ffff88014826fa28>
[  643.468267] ---[ end trace 6a1b3fb1a9d7d6e3 ]---

This can be easily reproduced by running xfstests with the integrity
checker enabled.

Fixes: 1ba98d08 (Btrfs: detect corruption when non-root leaf has zero item)
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit ed0df618 upstream.

The balance status item contains currently known filter values, but the
stripes filter was unintentionally not among them. This would mean, that
interrupted and automatically restarted balance does not apply the
stripe filters.

Fixes: dee32d0aSigned-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 054570a1 upstream.

During relocation of a data block group we create a relocation tree
for each fs/subvol tree by making a snapshot of each tree using
btrfs_copy_root() and the tree's commit root, and then setting the last
snapshot field for the fs/subvol tree's root to the value of the current
transaction id minus 1. However this can lead to relocation later
dropping references that it did not create if we have qgroups enabled,
leaving the filesystem in an inconsistent state that keeps aborting
transactions.

Lets consider the following example to explain the problem, which requires
qgroups to be enabled.

We are relocating data block group Y, we have a subvolume with id 258 that
has a root at level 1, that subvolume is used to store directory entries
for snapshots and we are currently at transaction 3404.

When committing transaction 3404, we have a pending snapshot and therefore
we call btrfs_run_delayed_items() at transaction.c:create_pending_snapshot()
in order to create its dentry at subvolume 258. This results in COWing
leaf A from root 258 in order to add the dentry. Note that leaf A
also contains file extent items referring to extents from some other
block group X (we are currently relocating block group Y). Later on, still
at create_pending_snapshot() we call qgroup_account_snapshot(), which
switches the commit root for root 258 when it calls switch_commit_roots(),
so now the COWed version of leaf A, lets call it leaf A', is accessible
from the commit root of tree 258. At the end of qgroup_account_snapshot(),
we call record_root_in_trans() with 258 as its argument, which results
in btrfs_init_reloc_root() being called, which in turn calls
relocation.c:create_reloc_root() in order to create a relocation tree
associated to root 258, which results in assigning the value of 3403
(which is the current transaction id minus 1 = 3404 - 1) to the
last_snapshot field of root 258. When creating the relocation tree root
at ctree.c:btrfs_copy_root() we add a shared reference for leaf A',
corresponding to the relocation tree's root, when we call btrfs_inc_ref()
against the COWed root (a copy of the commit root from tree 258), which
is at level 1. So at this point leaf A' has 2 references, one normal
reference corresponding to root 258 and one shared reference corresponding
to the root of the relocation tree.

Transaction 3404 finishes its commit and transaction 3405 is started by
relocation when calling merge_reloc_root() for the relocation tree
associated to root 258. In the meanwhile leaf A' is COWed again, in
response to some filesystem operation, when we are still at transaction
3405. However when we COW leaf A', at ctree.c:update_ref_for_cow(), we
call btrfs_block_can_be_shared() in order to figure out if other trees
refer to the leaf and if any such trees exists, add a full back reference
to leaf A' - but btrfs_block_can_be_shared() incorrectly returns false
because the following condition is false:

  btrfs_header_generation(buf) <= btrfs_root_last_snapshot(&root->root_item)

which evaluates to 3404 <= 3403. So after leaf A' is COWed, it stays with
only one reference, corresponding to the shared reference we created when
we called btrfs_copy_root() to create the relocation tree's root and
btrfs_inc_ref() ends up not being called for leaf A' nor we end up setting
the flag BTRFS_BLOCK_FLAG_FULL_BACKREF in leaf A'. This results in not
adding shared references for the extents from block group X that leaf A'
refers to with its file extent items.

Later, after merging the relocation root we do a call to to
btrfs_drop_snapshot() in order to delete the relocation tree. This ends
up calling do_walk_down() when path->slots[1] points to leaf A', which
results in calling btrfs_lookup_extent_info() to get the number of
references for leaf A', which is 1 at this time (only the shared reference
exists) and this value is stored at wc->refs[0]. After this walk_up_proc()
is called when wc->level is 0 and path->nodes[0] corresponds to leaf A'.
Because the current level is 0 and wc->refs[0] is 1, it does call
btrfs_dec_ref() against leaf A', which results in removing the single
references that the extents from block group X have which are associated
to root 258 - the expectation was to have each of these extents with 2
references - one reference for root 258 and one shared reference related
to the root of the relocation tree, and so we would drop only the shared
reference (because leaf A' was supposed to have the flag
BTRFS_BLOCK_FLAG_FULL_BACKREF set).

This leaves the filesystem in an inconsistent state as we now have file
extent items in a subvolume tree that point to extents from block group X
without references in the extent tree. So later on when we try to decrement
the references for these extents, for example due to a file unlink operation,
truncate operation or overwriting ranges of a file, we fail because the
expected references do not exist in the extent tree.

This leads to warnings and transaction aborts like the following:

[  588.965795] ------------[ cut here ]------------
[  588.965815] WARNING: CPU: 2 PID: 2479 at fs/btrfs/extent-tree.c:1625 lookup_inline_extent_backref+0x432/0x5b0 [btrfs]
[  588.965816] Modules linked in: af_packet iscsi_ibft iscsi_boot_sysfs xfs libcrc32c ppdev acpi_cpufreq button tpm_tis e1000 i2c_piix4 pcspkr parport_pc
parport tpm qemu_fw_cfg joydev btrfs xor raid6_pq sr_mod cdrom ata_generic virtio_scsi ata_piix virtio_pci bochs_drm virtio_ring drm_kms_helper syscopyarea
sysfillrect sysimgblt fb_sys_fops virtio ttm serio_raw drm floppy sg
[  588.965831] CPU: 2 PID: 2479 Comm: kworker/u8:7 Not tainted 4.7.3-3-default-fdm+ #1
[  588.965832] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014
[  588.965844] Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs]
[  588.965845]  0000000000000000 ffff8802263bfa28 ffffffff813af542 0000000000000000
[  588.965847]  0000000000000000 ffff8802263bfa68 ffffffff81081e8b 0000065900000000
[  588.965848]  ffff8801db2af000 000000012bbe2000 0000000000000000 ffff880215703b48
[  588.965849] Call Trace:
[  588.965852]  [<ffffffff813af542>] dump_stack+0x63/0x81
[  588.965854]  [<ffffffff81081e8b>] __warn+0xcb/0xf0
[  588.965855]  [<ffffffff81081f7d>] warn_slowpath_null+0x1d/0x20
[  588.965863]  [<ffffffffa0175042>] lookup_inline_extent_backref+0x432/0x5b0 [btrfs]
[  588.965865]  [<ffffffff81143220>] ? trace_clock_local+0x10/0x30
[  588.965867]  [<ffffffff8114c5df>] ? rb_reserve_next_event+0x6f/0x460
[  588.965875]  [<ffffffffa0175215>] insert_inline_extent_backref+0x55/0xd0 [btrfs]
[  588.965882]  [<ffffffffa017531f>] __btrfs_inc_extent_ref.isra.55+0x8f/0x240 [btrfs]
[  588.965890]  [<ffffffffa017acea>] __btrfs_run_delayed_refs+0x74a/0x1260 [btrfs]
[  588.965892]  [<ffffffff810cb046>] ? cpuacct_charge+0x86/0xa0
[  588.965900]  [<ffffffffa017e74f>] btrfs_run_delayed_refs+0x9f/0x2c0 [btrfs]
[  588.965908]  [<ffffffffa017ea04>] delayed_ref_async_start+0x94/0xb0 [btrfs]
[  588.965918]  [<ffffffffa01c799a>] btrfs_scrubparity_helper+0xca/0x350 [btrfs]
[  588.965928]  [<ffffffffa01c7c5e>] btrfs_extent_refs_helper+0xe/0x10 [btrfs]
[  588.965930]  [<ffffffff8109b323>] process_one_work+0x1f3/0x4e0
[  588.965931]  [<ffffffff8109b658>] worker_thread+0x48/0x4e0
[  588.965932]  [<ffffffff8109b610>] ? process_one_work+0x4e0/0x4e0
[  588.965934]  [<ffffffff810a1659>] kthread+0xc9/0xe0
[  588.965936]  [<ffffffff816f2f1f>] ret_from_fork+0x1f/0x40
[  588.965937]  [<ffffffff810a1590>] ? kthread_worker_fn+0x170/0x170
[  588.965938] ---[ end trace 34e5232c933a1749 ]---
[  588.966187] ------------[ cut here ]------------
[  588.966196] WARNING: CPU: 2 PID: 2479 at fs/btrfs/extent-tree.c:2966 btrfs_run_delayed_refs+0x28c/0x2c0 [btrfs]
[  588.966196] BTRFS: Transaction aborted (error -5)
[  588.966197] Modules linked in: af_packet iscsi_ibft iscsi_boot_sysfs xfs libcrc32c ppdev acpi_cpufreq button tpm_tis e1000 i2c_piix4 pcspkr parport_pc
parport tpm qemu_fw_cfg joydev btrfs xor raid6_pq sr_mod cdrom ata_generic virtio_scsi ata_piix virtio_pci bochs_drm virtio_ring drm_kms_helper syscopyarea
sysfillrect sysimgblt fb_sys_fops virtio ttm serio_raw drm floppy sg
[  588.966206] CPU: 2 PID: 2479 Comm: kworker/u8:7 Tainted: G        W       4.7.3-3-default-fdm+ #1
[  588.966207] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014
[  588.966217] Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs]
[  588.966217]  0000000000000000 ffff8802263bfc98 ffffffff813af542 ffff8802263bfce8
[  588.966219]  0000000000000000 ffff8802263bfcd8 ffffffff81081e8b 00000b96345ee000
[  588.966220]  ffffffffa021ae1c ffff880215703b48 00000000000005fe ffff8802345ee000
[  588.966221] Call Trace:
[  588.966223]  [<ffffffff813af542>] dump_stack+0x63/0x81
[  588.966224]  [<ffffffff81081e8b>] __warn+0xcb/0xf0
[  588.966225]  [<ffffffff81081eff>] warn_slowpath_fmt+0x4f/0x60
[  588.966233]  [<ffffffffa017e93c>] btrfs_run_delayed_refs+0x28c/0x2c0 [btrfs]
[  588.966241]  [<ffffffffa017ea04>] delayed_ref_async_start+0x94/0xb0 [btrfs]
[  588.966250]  [<ffffffffa01c799a>] btrfs_scrubparity_helper+0xca/0x350 [btrfs]
[  588.966259]  [<ffffffffa01c7c5e>] btrfs_extent_refs_helper+0xe/0x10 [btrfs]
[  588.966260]  [<ffffffff8109b323>] process_one_work+0x1f3/0x4e0
[  588.966261]  [<ffffffff8109b658>] worker_thread+0x48/0x4e0
[  588.966263]  [<ffffffff8109b610>] ? process_one_work+0x4e0/0x4e0
[  588.966264]  [<ffffffff810a1659>] kthread+0xc9/0xe0
[  588.966265]  [<ffffffff816f2f1f>] ret_from_fork+0x1f/0x40
[  588.966267]  [<ffffffff810a1590>] ? kthread_worker_fn+0x170/0x170
[  588.966268] ---[ end trace 34e5232c933a174a ]---
[  588.966269] BTRFS: error (device sda2) in btrfs_run_delayed_refs:2966: errno=-5 IO failure
[  588.966270] BTRFS info (device sda2): forced readonly

This was happening often on openSUSE and SLE systems using btrfs as the
root filesystem (with its default layout where multiple subvolumes are
used) where balance happens in the background triggered by a cron job and
snapshots are automatically created before/after package installations,
upgrades and removals. The issue could be triggered simply by running the
following loop on the first system boot post installation:

  while true; do
     zypper -n in nfs-kernel-server
     zypper -n rm nfs-kernel-server
  done

(If we were fast enough and made that loop before the cron job triggered
a balance operation and the balance finished)

So fix by setting the last_snapshot field of the root to the value of the
generation of its commit root. Like this btrfs_block_can_be_shared()
behaves correctly for the case where the relocation root is created during
a transaction commit and for the case where it's created before a
transaction commit.

Fixes: 6426c7ad (btrfs: qgroup: Fix qgroup accounting when creating snapshot)
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 2a7bf53f upstream.

If a log tree has a layout like the following:

leaf N:
        ...
        item 240 key (282 DIR_LOG_ITEM 0) itemoff 8189 itemsize 8
                dir log end 1275809046
leaf N + 1:
        item 0 key (282 DIR_LOG_ITEM 3936149215) itemoff 16275 itemsize 8
                dir log end 18446744073709551615
        ...

When we pass the value 1275809046 + 1 as the parameter start_ret to the
function tree-log.c:find_dir_range() (done by replay_dir_deletes()), we
end up with path->slots[0] having the value 239 (points to the last item
of leaf N, item 240). Because the dir log item in that position has an
offset value smaller than *start_ret (1275809046 + 1) we need to move on
to the next leaf, however the logic for that is wrong since it compares
the current slot to the number of items in the leaf, which is smaller
and therefore we don't lookup for the next leaf but instead we set the
slot to point to an item that does not exist, at slot 240, and we later
operate on that slot which has unexpected content or in the worst case
can result in an invalid memory access (accessing beyond the last page
of leaf N's extent buffer).

So fix the logic that checks when we need to lookup at the next leaf
by first incrementing the slot and only after to check if that slot
is beyond the last item of the current leaf.
Signed-off-by: Robbie Ko <robbieko@synology.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Fixes: e02119d5 (Btrfs: Add a write ahead tree log to optimize synchronous operations)
Signed-off-by: Filipe Manana <fdmanana@suse.com>
[Modified changelog for clarity and correctness]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit ec125cfb upstream.

While logging new directory entries, at tree-log.c:log_new_dir_dentries(),
after we call btrfs_search_forward() we get a leaf with a read lock on it,
and without unlocking that leaf we can end up calling btrfs_iget() to get
an inode pointer. The later (btrfs_iget()) can end up doing a read-only
search on the same tree again, if the inode is not in memory already, which
ends up causing a deadlock if some other task in the meanwhile started a
write search on the tree and is attempting to write lock the same leaf
that btrfs_search_forward() locked while holding write locks on upper
levels of the tree blocking the read search from btrfs_iget(). In this
scenario we get a deadlock.

So fix this by releasing the search path before calling btrfs_iget() at
tree-log.c:log_new_dir_dentries().

Example trace of such deadlock:

[ 4077.478852] kworker/u24:10  D ffff88107fc90640     0 14431      2 0x00000000
[ 4077.486752] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 4077.494346]  ffff880ffa56bad0 0000000000000046 0000000000009000 ffff880ffa56bfd8
[ 4077.502629]  ffff880ffa56bfd8 ffff881016ce21c0 ffffffffa06ecb26 ffff88101a5d6138
[ 4077.510915]  ffff880ebb5173b0 ffff880ffa56baf8 ffff880ebb517410 ffff881016ce21c0
[ 4077.519202] Call Trace:
[ 4077.528752]  [<ffffffffa06ed5ed>] ? btrfs_tree_lock+0xdd/0x2f0 [btrfs]
[ 4077.536049]  [<ffffffff81053680>] ? wake_up_atomic_t+0x30/0x30
[ 4077.542574]  [<ffffffffa068cc1f>] ? btrfs_search_slot+0x79f/0xb10 [btrfs]
[ 4077.550171]  [<ffffffffa06a5073>] ? btrfs_lookup_file_extent+0x33/0x40 [btrfs]
[ 4077.558252]  [<ffffffffa06c600b>] ? __btrfs_drop_extents+0x13b/0xdf0 [btrfs]
[ 4077.566140]  [<ffffffffa06fc9e2>] ? add_delayed_data_ref+0xe2/0x150 [btrfs]
[ 4077.573928]  [<ffffffffa06fd629>] ? btrfs_add_delayed_data_ref+0x149/0x1d0 [btrfs]
[ 4077.582399]  [<ffffffffa06cf3c0>] ? __set_extent_bit+0x4c0/0x5c0 [btrfs]
[ 4077.589896]  [<ffffffffa06b4a64>] ? insert_reserved_file_extent.constprop.75+0xa4/0x320 [btrfs]
[ 4077.599632]  [<ffffffffa06b206d>] ? start_transaction+0x8d/0x470 [btrfs]
[ 4077.607134]  [<ffffffffa06bab57>] ? btrfs_finish_ordered_io+0x2e7/0x600 [btrfs]
[ 4077.615329]  [<ffffffff8104cbc2>] ? process_one_work+0x142/0x3d0
[ 4077.622043]  [<ffffffff8104d729>] ? worker_thread+0x109/0x3b0
[ 4077.628459]  [<ffffffff8104d620>] ? manage_workers.isra.26+0x270/0x270
[ 4077.635759]  [<ffffffff81052b0f>] ? kthread+0xaf/0xc0
[ 4077.641404]  [<ffffffff81052a60>] ? kthread_create_on_node+0x110/0x110
[ 4077.648696]  [<ffffffff814a9ac8>] ? ret_from_fork+0x58/0x90
[ 4077.654926]  [<ffffffff81052a60>] ? kthread_create_on_node+0x110/0x110

[ 4078.358087] kworker/u24:15  D ffff88107fcd0640     0 14436      2 0x00000000
[ 4078.365981] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 4078.373574]  ffff880ffa57fad0 0000000000000046 0000000000009000 ffff880ffa57ffd8
[ 4078.381864]  ffff880ffa57ffd8 ffff88103004d0a0 ffffffffa06ecb26 ffff88101a5d6138
[ 4078.390163]  ffff880fbeffc298 ffff880ffa57faf8 ffff880fbeffc2f8 ffff88103004d0a0
[ 4078.398466] Call Trace:
[ 4078.408019]  [<ffffffffa06ed5ed>] ? btrfs_tree_lock+0xdd/0x2f0 [btrfs]
[ 4078.415322]  [<ffffffff81053680>] ? wake_up_atomic_t+0x30/0x30
[ 4078.421844]  [<ffffffffa068cc1f>] ? btrfs_search_slot+0x79f/0xb10 [btrfs]
[ 4078.429438]  [<ffffffffa06a5073>] ? btrfs_lookup_file_extent+0x33/0x40 [btrfs]
[ 4078.437518]  [<ffffffffa06c600b>] ? __btrfs_drop_extents+0x13b/0xdf0 [btrfs]
[ 4078.445404]  [<ffffffffa06fc9e2>] ? add_delayed_data_ref+0xe2/0x150 [btrfs]
[ 4078.453194]  [<ffffffffa06fd629>] ? btrfs_add_delayed_data_ref+0x149/0x1d0 [btrfs]
[ 4078.461663]  [<ffffffffa06cf3c0>] ? __set_extent_bit+0x4c0/0x5c0 [btrfs]
[ 4078.469161]  [<ffffffffa06b4a64>] ? insert_reserved_file_extent.constprop.75+0xa4/0x320 [btrfs]
[ 4078.478893]  [<ffffffffa06b206d>] ? start_transaction+0x8d/0x470 [btrfs]
[ 4078.486388]  [<ffffffffa06bab57>] ? btrfs_finish_ordered_io+0x2e7/0x600 [btrfs]
[ 4078.494561]  [<ffffffff8104cbc2>] ? process_one_work+0x142/0x3d0
[ 4078.501278]  [<ffffffff8104a507>] ? pwq_activate_delayed_work+0x27/0x40
[ 4078.508673]  [<ffffffff8104d729>] ? worker_thread+0x109/0x3b0
[ 4078.515098]  [<ffffffff8104d620>] ? manage_workers.isra.26+0x270/0x270
[ 4078.522396]  [<ffffffff81052b0f>] ? kthread+0xaf/0xc0
[ 4078.528032]  [<ffffffff81052a60>] ? kthread_create_on_node+0x110/0x110
[ 4078.535325]  [<ffffffff814a9ac8>] ? ret_from_fork+0x58/0x90
[ 4078.541552]  [<ffffffff81052a60>] ? kthread_create_on_node+0x110/0x110

[ 4079.355824] user-space-program D ffff88107fd30640     0 32020      1 0x00000000
[ 4079.363716]  ffff880eae8eba10 0000000000000086 0000000000009000 ffff880eae8ebfd8
[ 4079.372003]  ffff880eae8ebfd8 ffff881016c162c0 ffffffffa06ecb26 ffff88101a5d6138
[ 4079.380294]  ffff880fbed4b4c8 ffff880eae8eba38 ffff880fbed4b528 ffff881016c162c0
[ 4079.388586] Call Trace:
[ 4079.398134]  [<ffffffffa06ed595>] ? btrfs_tree_lock+0x85/0x2f0 [btrfs]
[ 4079.405431]  [<ffffffff81053680>] ? wake_up_atomic_t+0x30/0x30
[ 4079.411955]  [<ffffffffa06876fb>] ? btrfs_lock_root_node+0x2b/0x40 [btrfs]
[ 4079.419644]  [<ffffffffa068ce83>] ? btrfs_search_slot+0xa03/0xb10 [btrfs]
[ 4079.427237]  [<ffffffffa06aba52>] ? btrfs_buffer_uptodate+0x52/0x70 [btrfs]
[ 4079.435041]  [<ffffffffa0689b60>] ? generic_bin_search.constprop.38+0x80/0x190 [btrfs]
[ 4079.443897]  [<ffffffffa068ea44>] ? btrfs_insert_empty_items+0x74/0xd0 [btrfs]
[ 4079.451975]  [<ffffffffa072c443>] ? copy_items+0x128/0x850 [btrfs]
[ 4079.458890]  [<ffffffffa072da10>] ? btrfs_log_inode+0x629/0xbf3 [btrfs]
[ 4079.466292]  [<ffffffffa06f34a1>] ? btrfs_log_inode_parent+0xc61/0xf30 [btrfs]
[ 4079.474373]  [<ffffffffa06f45a9>] ? btrfs_log_dentry_safe+0x59/0x80 [btrfs]
[ 4079.482161]  [<ffffffffa06c298d>] ? btrfs_sync_file+0x20d/0x330 [btrfs]
[ 4079.489558]  [<ffffffff8112777c>] ? do_fsync+0x4c/0x80
[ 4079.495300]  [<ffffffff81127a0a>] ? SyS_fdatasync+0xa/0x10
[ 4079.501422]  [<ffffffff814a9b72>] ? system_call_fastpath+0x16/0x1b

[ 4079.508334] user-space-program D ffff88107fc30640     0 32021      1 0x00000004
[ 4079.516226]  ffff880eae8efbf8 0000000000000086 0000000000009000 ffff880eae8effd8
[ 4079.524513]  ffff880eae8effd8 ffff881030279610 ffffffffa06ecb26 ffff88101a5d6138
[ 4079.532802]  ffff880ebb671d88 ffff880eae8efc20 ffff880ebb671de8 ffff881030279610
[ 4079.541092] Call Trace:
[ 4079.550642]  [<ffffffffa06ed595>] ? btrfs_tree_lock+0x85/0x2f0 [btrfs]
[ 4079.557941]  [<ffffffff81053680>] ? wake_up_atomic_t+0x30/0x30
[ 4079.564463]  [<ffffffffa068cc1f>] ? btrfs_search_slot+0x79f/0xb10 [btrfs]
[ 4079.572058]  [<ffffffffa06bb7d8>] ? btrfs_truncate_inode_items+0x168/0xb90 [btrfs]
[ 4079.580526]  [<ffffffffa06b04be>] ? join_transaction.isra.15+0x1e/0x3a0 [btrfs]
[ 4079.588701]  [<ffffffffa06b206d>] ? start_transaction+0x8d/0x470 [btrfs]
[ 4079.596196]  [<ffffffffa0690ac6>] ? block_rsv_add_bytes+0x16/0x50 [btrfs]
[ 4079.603789]  [<ffffffffa06bc2e9>] ? btrfs_truncate+0xe9/0x2e0 [btrfs]
[ 4079.610994]  [<ffffffffa06bd00b>] ? btrfs_setattr+0x30b/0x410 [btrfs]
[ 4079.618197]  [<ffffffff81117c1c>] ? notify_change+0x1dc/0x680
[ 4079.624625]  [<ffffffff8123c8a4>] ? aa_path_perm+0xd4/0x160
[ 4079.630854]  [<ffffffff810f4fcb>] ? do_truncate+0x5b/0x90
[ 4079.636889]  [<ffffffff810f59fa>] ? do_sys_ftruncate.constprop.15+0x10a/0x160
[ 4079.644869]  [<ffffffff8110d87b>] ? SyS_fcntl+0x5b/0x570
[ 4079.650805]  [<ffffffff814a9b72>] ? system_call_fastpath+0x16/0x1b

[ 4080.410607] user-space-program D ffff88107fc70640     0 32028  12639 0x00000004
[ 4080.418489]  ffff880eaeccbbe0 0000000000000086 0000000000009000 ffff880eaeccbfd8
[ 4080.426778]  ffff880eaeccbfd8 ffff880f317ef1e0 ffffffffa06ecb26 ffff88101a5d6138
[ 4080.435067]  ffff880ef7e93928 ffff880f317ef1e0 ffff880eaeccbc08 ffff880f317ef1e0
[ 4080.443353] Call Trace:
[ 4080.452920]  [<ffffffffa06ed15d>] ? btrfs_tree_read_lock+0xdd/0x190 [btrfs]
[ 4080.460703]  [<ffffffff81053680>] ? wake_up_atomic_t+0x30/0x30
[ 4080.467225]  [<ffffffffa06876bb>] ? btrfs_read_lock_root_node+0x2b/0x40 [btrfs]
[ 4080.475400]  [<ffffffffa068cc81>] ? btrfs_search_slot+0x801/0xb10 [btrfs]
[ 4080.482994]  [<ffffffffa06b2df0>] ? btrfs_clean_one_deleted_snapshot+0xe0/0xe0 [btrfs]
[ 4080.491857]  [<ffffffffa06a70a6>] ? btrfs_lookup_inode+0x26/0x90 [btrfs]
[ 4080.499353]  [<ffffffff810ec42f>] ? kmem_cache_alloc+0xaf/0xc0
[ 4080.505879]  [<ffffffffa06bd905>] ? btrfs_iget+0xd5/0x5d0 [btrfs]
[ 4080.512696]  [<ffffffffa06caf04>] ? btrfs_get_token_64+0x104/0x120 [btrfs]
[ 4080.520387]  [<ffffffffa06f341f>] ? btrfs_log_inode_parent+0xbdf/0xf30 [btrfs]
[ 4080.528469]  [<ffffffffa06f45a9>] ? btrfs_log_dentry_safe+0x59/0x80 [btrfs]
[ 4080.536258]  [<ffffffffa06c298d>] ? btrfs_sync_file+0x20d/0x330 [btrfs]
[ 4080.543657]  [<ffffffff8112777c>] ? do_fsync+0x4c/0x80
[ 4080.549399]  [<ffffffff81127a0a>] ? SyS_fdatasync+0xa/0x10
[ 4080.555534]  [<ffffffff814a9b72>] ? system_call_fastpath+0x16/0x1b
Signed-off-by: Robbie Ko <robbieko@synology.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Fixes: 2f2ff0ee (Btrfs: fix metadata inconsistencies after directory fsync)
Signed-off-by: Filipe Manana <fdmanana@suse.com>
[Modified changelog for clarity and correctness]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit ef85b25e upstream.

This can only happen with CONFIG_BTRFS_FS_CHECK_INTEGRITY=y.

Commit 1ba98d08 ("Btrfs: detect corruption when non-root leaf has zero item")
assumes that a leaf is its root when leaf->bytenr == btrfs_root_bytenr(root),
however, we should not use btrfs_root_bytenr(root) since it's mainly got
updated during committing transaction.  So the check can fail when doing
COW on this leaf while it is a root.

This changes to use "if (leaf == btrfs_root_node(root))" instead, just like
how we check whether leaf is a root in __btrfs_cow_block().

Fixes: 1ba98d08 (Btrfs: detect corruption when non-root leaf has zero item)
Reported-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 2939e1a8 upstream.

Problem statement: unprivileged user who has read-write access to more than
one btrfs subvolume may easily consume all kernel memory (eventually
triggering oom-killer).

Reproducer (./mkrmdir below essentially loops over mkdir/rmdir):

[root@kteam1 ~]# cat prep.sh

DEV=/dev/sdb
mkfs.btrfs -f $DEV
mount $DEV /mnt
for i in `seq 1 16`
do
	mkdir /mnt/$i
	btrfs subvolume create /mnt/SV_$i
	ID=`btrfs subvolume list /mnt |grep "SV_$i$" |cut -d ' ' -f 2`
	mount -t btrfs -o subvolid=$ID $DEV /mnt/$i
	chmod a+rwx /mnt/$i
done

[root@kteam1 ~]# sh prep.sh

[maxim@kteam1 ~]$ for i in `seq 1 16`; do ./mkrmdir /mnt/$i 2000 2000 & done

[root@kteam1 ~]# for i in `seq 1 4`; do grep "kmalloc-128" /proc/slabinfo | grep -v dma; sleep 60; done
kmalloc-128        10144  10144    128   32    1 : tunables    0    0    0 : slabdata    317    317      0
kmalloc-128       9992352 9992352    128   32    1 : tunables    0    0    0 : slabdata 312261 312261      0
kmalloc-128       24226752 24226752    128   32    1 : tunables    0    0    0 : slabdata 757086 757086      0
kmalloc-128       42754240 42754240    128   32    1 : tunables    0    0    0 : slabdata 1336070 1336070      0

The huge numbers above come from insane number of async_work-s allocated
and queued by btrfs_wq_run_delayed_node.

The problem is caused by btrfs_wq_run_delayed_node() queuing more and more
works if the number of delayed items is above BTRFS_DELAYED_BACKGROUND. The
worker func (btrfs_async_run_delayed_root) processes at least
BTRFS_DELAYED_BATCH items (if they are present in the list). So, the machinery
works as expected while the list is almost empty. As soon as it is getting
bigger, worker func starts to process more than one item at a time, it takes
longer, and the chances to have async_works queued more than needed is getting
higher.

The problem above is worsened by another flaw of delayed-inode implementation:
if async_work was queued in a throttling branch (number of items >=
BTRFS_DELAYED_WRITEBACK), corresponding worker func won't quit until
the number of items < BTRFS_DELAYED_BACKGROUND / 2. So, it is possible that
the func occupies CPU infinitely (up to 30sec in my experiments): while the
func is trying to drain the list, the user activity may add more and more
items to the list.

The patch fixes both problems in straightforward way: refuse queuing too
many works in btrfs_wq_run_delayed_node and bail out of worker func if
at least BTRFS_DELAYED_WRITEBACK items are processed.

Changed in v2: remove support of thresh == NO_THRESHOLD.
Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>