Commit Graph

59807 Commits

Author SHA1 Message Date
Linus Torvalds b6c0649caf dax fixes v5.3-rc4
- Fix dax_layout_busy_page() to not discard private cow pages of fs/dax
   private mappings.
 
 - Update the memremap_pages core to properly cleanup on behalf of
   internal reference-count users like device-dax.
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Merge tag 'dax-fixes-5.3-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull dax fixes from Dan Williams:
 "A filesystem-dax and device-dax fix for v5.3.

  The filesystem-dax fix is tagged for stable as the implementation has
  been mistakenly throwing away all cow pages on any truncate or hole
  punch operation as part of the solution to coordinate device-dma vs
  truncate to dax pages.

  The device-dax change fixes up a regression this cycle from the
  introduction of a common 'internal per-cpu-ref' implementation.

  Summary:

   - Fix dax_layout_busy_page() to not discard private cow pages of
     fs/dax private mappings.

   - Update the memremap_pages core to properly cleanup on behalf of
     internal reference-count users like device-dax"

* tag 'dax-fixes-5.3-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  mm/memremap: Fix reuse of pgmap instances with internal references
  dax: dax_layout_busy_page() should not unmap cow pages
2019-08-11 13:15:10 -07:00
Linus Torvalds 829890d266 Fix incorrect lseek / fiemap results
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Merge tag 'gfs2-v5.3-rc3.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fix from Andreas Gruenbacher:
 "Fix incorrect lseek / fiemap results"

* tag 'gfs2-v5.3-rc3.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: gfs2_walk_metadata fix
2019-08-10 15:41:15 -07:00
Linus Torvalds 50e73a4a41 for-linus-20190809
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Merge tag 'for-linus-20190809' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - Revert of a bcache patch that caused an oops for some (Coly)

 - ata rb532 unused warning fix (Gustavo)

 - AoE kernel crash fix (He)

 - Error handling fixup for blkdev_get() (Jan)

 - libata read/write translation and SFF PIO fix (me)

 - Use after free and error handling fix for O_DIRECT fragments. There's
   still a nowait + sync oddity in there, we'll nail that start next
   week. If all else fails, I'll queue a revert of the NOWAIT change.
   (me)

 - Loop GFP_KERNEL -> GFP_NOIO deadlock fix (Mikulas)

 - Two BFQ regression fixes that caused crashes (Paolo)

* tag 'for-linus-20190809' of git://git.kernel.dk/linux-block:
  bcache: Revert "bcache: use sysfs_match_string() instead of __sysfs_match_string()"
  loop: set PF_MEMALLOC_NOIO for the worker thread
  bdev: Fixup error handling in blkdev_get()
  block, bfq: handle NULL return value by bfq_init_rq()
  block, bfq: move update of waker and woken list to queue freeing
  block, bfq: reset last_completed_rq_bfqq if the pointed queue is freed
  block: aoe: Fix kernel crash due to atomic sleep when exiting
  libata: add SG safety checks in SFF pio transfers
  libata: have ata_scsi_rw_xlat() fail invalid passthrough requests
  block: fix O_DIRECT error handling for bio fragments
  ata: rb532_cf: Fix unused variable warning in rb532_pata_driver_probe
2019-08-09 09:28:18 -07:00
Andreas Gruenbacher a27a0c9b6a gfs2: gfs2_walk_metadata fix
It turns out that the current version of gfs2_metadata_walker suffers
from multiple problems that can cause gfs2_hole_size to report an
incorrect size.  This will confuse fiemap as well as lseek with the
SEEK_DATA flag.

Fix that by changing gfs2_hole_walker to compute the metapath to the
first data block after the hole (if any), and compute the hole size
based on that.

Fixes xfstest generic/490.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
Cc: stable@vger.kernel.org # v4.18+
2019-08-09 16:56:12 +01:00
Linus Torvalds b678c568c5 NFS client bugfixes for Linux 5.3
Highlights include:
 
 Stable fixes:
 - NFSv4: Ensure we check the return value of update_open_stateid() so we
   correctly track active open state.
 - NFSv4: Fix for delegation state recovery to ensure we recover all open
   modes that are active.
 - NFSv4: Fix an Oops in nfs4_do_setattr
 
 Bugfixes:
 - NFS: Fix regression whereby fscache errors are appearing on 'nofsc' mounts
 - NFSv4: Fix a potential sleep while atomic in nfs4_do_reclaim()
 - NFSv4: Fix a credential refcount leak in nfs41_check_delegation_stateid
 - pNFS: Report errors from the call to nfs4_select_rw_stateid()
 - NFSv4: Various other delegation and open stateid recovery fixes
 - NFSv4: Fix state recovery behaviour when server connection times out
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Merge tag 'nfs-for-5.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

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

  Stable fixes:

   - NFSv4: Ensure we check the return value of update_open_stateid() so
     we correctly track active open state.

   - NFSv4: Fix for delegation state recovery to ensure we recover all
     open modes that are active.

   - NFSv4: Fix an Oops in nfs4_do_setattr

  Fixes:

   - NFS: Fix regression whereby fscache errors are appearing on 'nofsc'
     mounts

   - NFSv4: Fix a potential sleep while atomic in nfs4_do_reclaim()

   - NFSv4: Fix a credential refcount leak in nfs41_check_delegation_stateid

   - pNFS: Report errors from the call to nfs4_select_rw_stateid()

   - NFSv4: Various other delegation and open stateid recovery fixes

   - NFSv4: Fix state recovery behaviour when server connection times
     out"

* tag 'nfs-for-5.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4: Ensure state recovery handles ETIMEDOUT correctly
  NFS: Fix regression whereby fscache errors are appearing on 'nofsc' mounts
  NFSv4: Fix an Oops in nfs4_do_setattr
  NFSv4: Fix a potential sleep while atomic in nfs4_do_reclaim()
  NFSv4: Check the return value of update_open_stateid()
  NFSv4.1: Only reap expired delegations
  NFSv4.1: Fix open stateid recovery
  NFSv4: Report the error from nfs4_select_rw_stateid()
  NFSv4: When recovering state fails with EAGAIN, retry the same recovery
  NFSv4: Print an error in the syslog when state is marked as irrecoverable
  NFSv4: Fix delegation state recovery
  NFSv4: Fix a credential refcount leak in nfs41_check_delegation_stateid
2019-08-08 14:47:19 -07:00
Linus Torvalds 518a1c2f09 Merge tag '5.3-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
 "Six small SMB3 fixes, two for stable"

* tag '5.3-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  SMB3: Kernel oops mounting a encryptData share with CONFIG_DEBUG_VIRTUAL
  smb3: update TODO list of missing features
  smb3: send CAP_DFS capability during session setup
  SMB3: Fix potential memory leak when processing compound chain
  SMB3: Fix deadlock in validate negotiate hits reconnect
  cifs: fix rmmod regression in cifs.ko caused by force_sig changes
2019-08-08 09:57:50 -07:00
Jan Kara e91455bad5 bdev: Fixup error handling in blkdev_get()
Commit 89e524c04f ("loop: Fix mount(2) failure due to race with
LOOP_SET_FD") converted blkdev_get() to use the new helpers for
finishing claiming of a block device. However the conversion botched the
error handling in blkdev_get() and thus the bdev has been marked as held
even in case __blkdev_get() returned error. This led to occasional
warnings with block/001 test from blktests like:

kernel: WARNING: CPU: 5 PID: 907 at fs/block_dev.c:1899 __blkdev_put+0x396/0x3a0

Correct the error handling.

CC: stable@vger.kernel.org
Fixes: 89e524c04f ("loop: Fix mount(2) failure due to race with LOOP_SET_FD")
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-08 07:37:03 -06:00
Jens Axboe e15c2ffa10 block: fix O_DIRECT error handling for bio fragments
0eb6ddfb86 tried to fix this up, but introduced a use-after-free
of dio. Additionally, we still had an issue with error handling,
as reported by Darrick:

"I noticed a regression in xfs/747 (an unreleased xfstest for the
xfs_scrub media scanning feature) on 5.3-rc3.  I'll condense that down
to a simpler reproducer:

error-test: 0 209 linear 8:48 0
error-test: 209 1 error
error-test: 210 6446894 linear 8:48 210

Basically we have a ~3G /dev/sdd and we set up device mapper to fail IO
for sector 209 and to pass the io to the scsi device everywhere else.

On 5.3-rc3, performing a directio pread of this range with a < 1M buffer
(in other words, a request for fewer than MAX_BIO_PAGES bytes) yields
EIO like you'd expect:

pread64(3, 0x7f880e1c7000, 1048576, 0)  = -1 EIO (Input/output error)
pread: Input/output error
+++ exited with 0 +++

But doing it with a larger buffer succeeds(!):

pread64(3, "XFSB\0\0\20\0\0\0\0\0\0\fL\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1146880, 0) = 1146880
read 1146880/1146880 bytes at offset 0
1 MiB, 1 ops; 0.0009 sec (1.124 GiB/sec and 1052.6316 ops/sec)
+++ exited with 0 +++

(Note that the part of the buffer corresponding to the dm-error area is
uninitialized)

On 5.3-rc2, both commands would fail with EIO like you'd expect.  The
only change between rc2 and rc3 is commit 0eb6ddfb86 ("block: Fix
__blkdev_direct_IO() for bio fragments").

AFAICT we end up in __blkdev_direct_IO with a 1120K buffer, which gets
split into two bios: one for the first BIO_MAX_PAGES worth of data (1MB)
and a second one for the 96k after that."

Fix this by noting that it's always safe to dereference dio if we get
BLK_QC_T_EAGAIN returned, as end_io hasn't been run for that case. So
we can safely increment the dio size before calling submit_bio(), and
then decrement it on failure (not that it really matters, as the bio
and dio are going away).

For error handling, return to the original method of just using 'ret'
for tracking the error, and the size tracking in dio->size.

Fixes: 0eb6ddfb86 ("block: Fix __blkdev_direct_IO() for bio fragments")
Fixes: 6a43074e2f ("block: properly handle IOCB_NOWAIT for async O_DIRECT IO")
Reported-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-07 12:19:43 -06:00
Trond Myklebust 67e7b52d44 NFSv4: Ensure state recovery handles ETIMEDOUT correctly
Ensure that the state recovery code handles ETIMEDOUT correctly,
and also that we set RPC_TASK_TIMEOUT when recovering open state.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-07 12:55:11 -04:00
Linus Torvalds 33920f1ec5 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from David Miller:
 "Yeah I should have sent a pull request last week, so there is a lot
  more here than usual:

   1) Fix memory leak in ebtables compat code, from Wenwen Wang.

   2) Several kTLS bug fixes from Jakub Kicinski (circular close on
      disconnect etc.)

   3) Force slave speed check on link state recovery in bonding 802.3ad
      mode, from Thomas Falcon.

   4) Clear RX descriptor bits before assigning buffers to them in
      stmmac, from Jose Abreu.

   5) Several missing of_node_put() calls, mostly wrt. for_each_*() OF
      loops, from Nishka Dasgupta.

   6) Double kfree_skb() in peak_usb can driver, from Stephane Grosjean.

   7) Need to hold sock across skb->destructor invocation, from Cong
      Wang.

   8) IP header length needs to be validated in ipip tunnel xmit, from
      Haishuang Yan.

   9) Use after free in ip6 tunnel driver, also from Haishuang Yan.

  10) Do not use MSI interrupts on r8169 chips before RTL8168d, from
      Heiner Kallweit.

  11) Upon bridge device init failure, we need to delete the local fdb.
      From Nikolay Aleksandrov.

  12) Handle erros from of_get_mac_address() properly in stmmac, from
      Martin Blumenstingl.

  13) Handle concurrent rename vs. dump in netfilter ipset, from Jozsef
      Kadlecsik.

  14) Setting NETIF_F_LLTX on mac80211 causes complete breakage with
      some devices, so revert. From Johannes Berg.

  15) Fix deadlock in rxrpc, from David Howells.

  16) Fix Kconfig deps of enetc driver, we must have PHYLIB. From Yue
      Haibing.

  17) Fix mvpp2 crash on module removal, from Matteo Croce.

  18) Fix race in genphy_update_link, from Heiner Kallweit.

  19) bpf_xdp_adjust_head() stopped working with generic XDP when we
      fixes generic XDP to support stacked devices properly, fix from
      Jesper Dangaard Brouer.

  20) Unbalanced RCU locking in rt6_update_exception_stamp_rt(), from
      David Ahern.

  21) Several memory leaks in new sja1105 driver, from Vladimir Oltean"

* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (214 commits)
  net: dsa: sja1105: Fix memory leak on meta state machine error path
  net: dsa: sja1105: Fix memory leak on meta state machine normal path
  net: dsa: sja1105: Really fix panic on unregistering PTP clock
  net: dsa: sja1105: Use the LOCKEDS bit for SJA1105 E/T as well
  net: dsa: sja1105: Fix broken learning with vlan_filtering disabled
  net: dsa: qca8k: Add of_node_put() in qca8k_setup_mdio_bus()
  net: sched: sample: allow accessing psample_group with rtnl
  net: sched: police: allow accessing police->params with rtnl
  net: hisilicon: Fix dma_map_single failed on arm64
  net: hisilicon: fix hip04-xmit never return TX_BUSY
  net: hisilicon: make hip04_tx_reclaim non-reentrant
  tc-testing: updated vlan action tests with batch create/delete
  net sched: update vlan action for batched events operations
  net: stmmac: tc: Do not return a fragment entry
  net: stmmac: Fix issues when number of Queues >= 4
  net: stmmac: xgmac: Fix XGMAC selftests
  be2net: disable bh with spin_lock in be_process_mcc
  net: cxgb3_main: Fix a resource leak in a error path in 'init_one()'
  net: ethernet: sun4i-emac: Support phy-handle property for finding PHYs
  net: bridge: move default pvid init/deinit to NETDEV_REGISTER/UNREGISTER
  ...
2019-08-06 17:11:59 -07:00
Sebastien Tisserant ee9d661823 SMB3: Kernel oops mounting a encryptData share with CONFIG_DEBUG_VIRTUAL
Fix kernel oops when mounting a encryptData CIFS share with
CONFIG_DEBUG_VIRTUAL

Signed-off-by: Sebastien Tisserant <stisserant@wallix.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
2019-08-05 22:50:38 -05:00
Steve French 8d33096a46 smb3: send CAP_DFS capability during session setup
We had a report of a server which did not do a DFS referral
because the session setup Capabilities field was set to 0
(unlike negotiate protocol where we set CAP_DFS).  Better to
send it session setup in the capabilities as well (this also
more closely matches Windows client behavior).

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org>
2019-08-05 22:50:38 -05:00
Pavel Shilovsky 3edeb4a414 SMB3: Fix potential memory leak when processing compound chain
When a reconnect happens in the middle of processing a compound chain
the code leaks a buffer from the memory pool. Fix this by properly
checking for a return code and freeing buffers in case of error.

Also maintain a buf variable to be equal to either smallbuf or bigbuf
depending on a response buffer size while parsing a chain and when
returning to the caller.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
2019-08-05 22:50:13 -05:00
Pavel Shilovsky e99c63e4d8 SMB3: Fix deadlock in validate negotiate hits reconnect
Currently we skip SMB2_TREE_CONNECT command when checking during
reconnect because Tree Connect happens when establishing
an SMB session. For SMB 3.0 protocol version the code also calls
validate negotiate which results in SMB2_IOCL command being sent
over the wire. This may deadlock on trying to acquire a mutex when
checking for reconnect. Fix this by skipping SMB2_IOCL command
when doing the reconnect check.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
2019-08-05 22:49:54 -05:00
Vivek Goyal d75996dd02 dax: dax_layout_busy_page() should not unmap cow pages
Vivek:

    "As of now dax_layout_busy_page() calls unmap_mapping_range() with last
     argument as 1, which says even unmap cow pages. I am wondering who needs
     to get rid of cow pages as well.

     I noticed one interesting side affect of this. I mount xfs with -o dax and
     mmaped a file with MAP_PRIVATE and wrote some data to a page which created
     cow page. Then I called fallocate() on that file to zero a page of file.
     fallocate() called dax_layout_busy_page() which unmapped cow pages as well
     and then I tried to read back the data I wrote and what I get is old
     data from persistent memory. I lost the data I had written. This
     read basically resulted in new fault and read back the data from
     persistent memory.

     This sounds wrong. Are there any users which need to unmap cow pages
     as well? If not, I am proposing changing it to not unmap cow pages.

     I noticed this while while writing virtio_fs code where when I tried
     to reclaim a memory range and that corrupted the executable and I
     was running from virtio-fs and program got segment violation."

Dan:

    "In fact the unmap_mapping_range() in this path is only to synchronize
     against get_user_pages_fast() and force it to call back into the
     filesystem to re-establish the mapping. COW pages should be left
     untouched by dax_layout_busy_page()."

Cc: <stable@vger.kernel.org>
Fixes: 5fac7408d8 ("mm, fs, dax: handle layout changes to pinned dax mappings")
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Link: https://lore.kernel.org/r/20190802192956.GA3032@redhat.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2019-08-05 14:59:05 -07:00
Steve French 247bc9470b cifs: fix rmmod regression in cifs.ko caused by force_sig changes
Fixes: 72abe3bcf0 ("signal/cifs: Fix cifs_put_tcp_session to call send_sig instead of force_sig")

The global change from force_sig caused module unloading of cifs.ko
to fail (since the cifsd process could not be killed, "rmmod cifs"
now would always fail)

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
2019-08-04 22:02:29 -05:00
Trond Myklebust dea1bb35c5 NFS: Fix regression whereby fscache errors are appearing on 'nofsc' mounts
People are reporing seeing fscache errors being reported concerning
duplicate cookies even in cases where they are not setting up fscache
at all. The rule needs to be that if fscache is not enabled, then it
should have no side effects at all.

To ensure this is the case, we disable fscache completely on all superblocks
for which the 'fsc' mount option was not set. In order to avoid issues
with '-oremount', we also disable the ability to turn fscache on via
remount.

Fixes: f1fe29b4a0 ("NFS: Use i_writecount to control whether...")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=200145
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Steve Dickson <steved@redhat.com>
Cc: David Howells <dhowells@redhat.com>
2019-08-04 22:35:41 -04:00
Trond Myklebust 09a54f0ebf NFSv4: Fix an Oops in nfs4_do_setattr
If the user specifies an open mode of 3, then we don't have a NFSv4 state
attached to the context, and so we Oops when we try to dereference it.

Reported-by: Olga Kornievskaia <aglo@umich.edu>
Fixes: 29b59f9416 ("NFSv4: change nfs4_do_setattr to take...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.10: 991eedb1371dc: NFSv4: Only pass the...
Cc: stable@vger.kernel.org # v4.10+
2019-08-04 22:35:41 -04:00
Trond Myklebust c77e22834a NFSv4: Fix a potential sleep while atomic in nfs4_do_reclaim()
John Hubbard reports seeing the following stack trace:

nfs4_do_reclaim
   rcu_read_lock /* we are now in_atomic() and must not sleep */
       nfs4_purge_state_owners
           nfs4_free_state_owner
               nfs4_destroy_seqid_counter
                   rpc_destroy_wait_queue
                       cancel_delayed_work_sync
                           __cancel_work_timer
                               __flush_work
                                   start_flush_work
                                       might_sleep:
                                        (kernel/workqueue.c:2975: BUG)

The solution is to separate out the freeing of the state owners
from nfs4_purge_state_owners(), and perform that outside the atomic
context.

Reported-by: John Hubbard <jhubbard@nvidia.com>
Fixes: 0aaaf5c424 ("NFS: Cache state owners after files are closed")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-04 22:35:40 -04:00
Trond Myklebust e3c8dc761e NFSv4: Check the return value of update_open_stateid()
Ensure that we always check the return value of update_open_stateid()
so that we can retry if the update of local state failed. This fixes
infinite looping on state recovery.

Fixes: e23008ec81 ("NFSv4 reduce attribute requests for open reclaim")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v3.7+
2019-08-04 22:35:40 -04:00
Trond Myklebust ad11408970 NFSv4.1: Only reap expired delegations
Fix nfs_reap_expired_delegations() to ensure that we only reap delegations
that are actually expired, rather than triggering on random errors.

Fixes: 45870d6909 ("NFSv4.1: Test delegation stateids when server...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-04 22:35:40 -04:00
Trond Myklebust 27a30cf64a NFSv4.1: Fix open stateid recovery
The logic for checking in nfs41_check_open_stateid() whether the state
is supported by a delegation is inverted. In addition, it makes more
sense to perform that check before we check for expired locks.

Fixes: 8a64c4ef10 ("NFSv4.1: Even if the stateid is OK,...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-04 22:35:40 -04:00
Trond Myklebust 731c74dd98 NFSv4: Report the error from nfs4_select_rw_stateid()
In pnfs_update_layout() ensure that we do report any fatal errors from
nfs4_select_rw_stateid().

Fixes: d9aba2b40d ("NFSv4: Don't use the zero stateid with layoutget")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-04 22:35:40 -04:00
Trond Myklebust c34fae003c NFSv4: When recovering state fails with EAGAIN, retry the same recovery
If the server returns with EAGAIN when we're trying to recover from
a server reboot, we currently delay for 1 second, but then mark the
stateid as needing recovery after the grace period has expired.

Instead, we should just retry the same recovery process immediately
after the 1 second delay. Break out of the loop after 10 retries.

Fixes: 35a61606a6 ("NFS: Reduce indentation of the switch statement...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-04 22:35:40 -04:00
Trond Myklebust 86dbd08b32 NFSv4: Print an error in the syslog when state is marked as irrecoverable
When error recovery fails due to a fatal error on the server, ensure
we log it in the syslog.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-04 22:35:40 -04:00
Trond Myklebust 5eb8d18ca0 NFSv4: Fix delegation state recovery
Once we clear the NFS_DELEGATED_STATE flag, we're telling
nfs_delegation_claim_opens() that we're done recovering all open state
for that stateid, so we really need to ensure that we test for all
open modes that are currently cached and recover them before exiting
nfs4_open_delegation_recall().

Fixes: 24311f8841 ("NFSv4: Recovery of recalled read delegations...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.3+
2019-08-04 22:35:40 -04:00
Trond Myklebust 8c39a39e28 NFSv4: Fix a credential refcount leak in nfs41_check_delegation_stateid
It is unsafe to dereference delegation outside the rcu lock, and in
any case, the refcount is guaranteed held if cred is non-zero.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-04 22:35:40 -04:00
Linus Torvalds e12b243de7 Merge tag 'xfs-5.3-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs fixes from Darrick Wong:

 - Avoid leaking kernel stack contents to userspace

 - Fix a potential null pointer dereference in the dabtree scrub code

* tag 'xfs-5.3-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: Fix possible null-pointer dereferences in xchk_da_btree_block_check_sibling()
  xfs: fix stack contents leakage in the v1 inumber ioctls
2019-08-03 10:43:44 -07:00
Linus Torvalds b7aea68a19 Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
 "17 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  drivers/acpi/scan.c: document why we don't need the device_hotplug_lock
  memremap: move from kernel/ to mm/
  lib/test_meminit.c: use GFP_ATOMIC in RCU critical section
  asm-generic: fix -Wtype-limits compiler warnings
  cgroup: kselftest: relax fs_spec checks
  mm/memory_hotplug.c: remove unneeded return for void function
  mm/migrate.c: initialize pud_entry in migrate_vma()
  coredump: split pipe command whitespace before expanding template
  page flags: prioritize kasan bits over last-cpuid
  ubsan: build ubsan.c more conservatively
  kasan: remove clang version check for KASAN_STACK
  mm: compaction: avoid 100% CPU usage during compaction when a task is killed
  mm: migrate: fix reference check race between __find_get_block() and migration
  mm: vmscan: check if mem cgroup is disabled or not before calling memcg slab shrinker
  ocfs2: remove set but not used variable 'last_hash'
  Revert "kmemleak: allow to coexist with fault injection"
  kernel/signal.c: fix a kernel-doc markup
2019-08-03 09:20:49 -07:00
Paul Wise 315c69261d coredump: split pipe command whitespace before expanding template
Save the offsets of the start of each argument to avoid having to update
pointers to each argument after every corename krealloc and to avoid
having to duplicate the memory for the dump command.

Executable names containing spaces were previously being expanded from
%e or %E and then split in the middle of the filename.  This is
incorrect behaviour since an argument list can represent arguments with
spaces.

The splitting could lead to extra arguments being passed to the core
dump handler that it might have interpreted as options or ignored
completely.

Core dump handlers that are not aware of this Linux kernel issue will be
using %e or %E without considering that it may be split and so they will
be vulnerable to processes with spaces in their names breaking their
argument list.  If their internals are otherwise well written, such as
if they are written in shell but quote arguments, they will work better
after this change than before.  If they are not well written, then there
is a slight chance of breakage depending on the details of the code but
they will already be fairly broken by the split filenames.

Core dump handlers that are aware of this Linux kernel issue will be
placing %e or %E as the last item in their core_pattern and then
aggregating all of the remaining arguments into one, separated by
spaces.  Alternatively they will be obtaining the filename via other
methods.  Both of these will be compatible with the new arrangement.

A side effect from this change is that unknown template types (for
example %z) result in an empty argument to the dump handler instead of
the argument being dropped.  This is a desired change as:

It is easier for dump handlers to process empty arguments than dropped
ones, especially if they are written in shell or don't pass each
template item with a preceding command-line option in order to
differentiate between individual template types.  Most core_patterns in
the wild do not use options so they can confuse different template types
(especially numeric ones) if an earlier one gets dropped in old kernels.
If the kernel introduces a new template type and a core_pattern uses it,
the core dump handler might not expect that the argument can be dropped
in old kernels.

For example, this can result in security issues when %d is dropped in
old kernels.  This happened with the corekeeper package in Debian and
resulted in the interface between corekeeper and Linux having to be
rewritten to use command-line options to differentiate between template
types.

The core_pattern for most core dump handlers is written by the handler
author who would generally not insert unknown template types so this
change should be compatible with all the core dump handlers that exist.

Link: http://lkml.kernel.org/r/20190528051142.24939-1-pabs3@bonedaddy.net
Fixes: 74aadce986 ("core_pattern: allow passing of arguments to user mode helper when core_pattern is a pipe")
Signed-off-by: Paul Wise <pabs3@bonedaddy.net>
Reported-by: Jakub Wilk <jwilk@jwilk.net> [https://bugs.debian.org/924398]
Reported-by: Paul Wise <pabs3@bonedaddy.net> [https://lore.kernel.org/linux-fsdevel/c8b7ecb8508895bf4adb62a748e2ea2c71854597.camel@bonedaddy.net/]
Suggested-by: Jakub Wilk <jwilk@jwilk.net>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-08-03 07:02:01 -07:00
YueHaibing 7bc36e3ce9 ocfs2: remove set but not used variable 'last_hash'
Fixes gcc '-Wunused-but-set-variable' warning:

  fs/ocfs2/xattr.c: In function ocfs2_xattr_bucket_find:
  fs/ocfs2/xattr.c:3828:6: warning: variable last_hash set but not used [-Wunused-but-set-variable]

It's never used and can be removed.

Link: http://lkml.kernel.org/r/20190716132110.34836-1-yuehaibing@huawei.com
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-08-03 07:02:00 -07:00
Linus Torvalds 10e5ddd71f for-linus-20190802
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Merge tag 'for-linus-20190802' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Here's a small collection of fixes that should go into this series.
  This contains:

   - io_uring potential use-after-free fix (Jackie)

   - loop regression fix (Jan)

   - O_DIRECT fragmented bio regression fix (Damien)

   - Mark Denis as the new floppy maintainer (Denis)

   - ataflop switch fall-through annotation (Gustavo)

   - libata zpodd overflow fix (Kees)

   - libata ahci deferred probe fix (Miquel)

   - nbd invalidation BUG_ON() fix (Munehisa)

   - dasd endless loop fix (Stefan)"

* tag 'for-linus-20190802' of git://git.kernel.dk/linux-block:
  s390/dasd: fix endless loop after read unit address configuration
  block: Fix __blkdev_direct_IO() for bio fragments
  MAINTAINERS: floppy: take over maintainership
  nbd: replace kill_bdev() with __invalidate_device() again
  ata: libahci: do not complain in case of deferred probe
  io_uring: fix KASAN use after free in io_sq_wq_submit_work
  loop: Fix mount(2) failure due to race with LOOP_SET_FD
  libata: zpodd: Fix small read overflow in zpodd_get_mech_type()
  ataflop: Mark expected switch fall-through
2019-08-02 14:31:26 -07:00
Linus Torvalds d38c3fa6f9 for-5.3-rc2-tag
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Merge tag 'for-5.3-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - tiny race window during 2 transactions aborting at the same time can
   accidentally lead to a commit

 - regression fix, possible deadlock during fiemap

 - fix for an old bug when incremental send can fail on a file that has
   been deduplicated in a special way

* tag 'for-5.3-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  Btrfs: fix deadlock between fiemap and transaction commits
  Btrfs: fix race leading to fs corruption after transaction abort
  Btrfs: fix incremental send failure after deduplication
2019-08-02 14:19:41 -07:00
Linus Torvalds 97b00aff2c Fix gfs2 cluster coherency bug
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Merge tag 'gfs2-v5.3-rc2.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fix from Andreas Gruenbacher:
 "Fix gfs2 cluster coherency bug"

* tag 'gfs2-v5.3-rc2.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Inode dirtying fix
2019-08-02 09:02:58 -07:00
Damien Le Moal 0eb6ddfb86 block: Fix __blkdev_direct_IO() for bio fragments
The recent fix to properly handle IOCB_NOWAIT for async O_DIRECT IO
(patch 6a43074e2f) introduced two problems with BIO fragment handling
for direct IOs:
1) The dio size processed is calculated by incrementing the ret variable
by the size of the bio fragment issued for the dio. However, this size
is obtained directly from bio->bi_iter.bi_size AFTER the bio submission
which may result in referencing the bi_size value after the bio
completed, resulting in an incorrect value use.
2) The ret variable is not incremented by the size of the last bio
fragment issued for the bio, leading to an invalid IO size being
returned to the user.

Fix both problem by using dio->size (which is incremented before the bio
submission) to update the value of ret after bio submissions, including
for the last bio fragment issued.

Fixes: 6a43074e2f ("block: properly handle IOCB_NOWAIT for async O_DIRECT IO")
Reported-by: Masato Suzuki <masato.suzuki@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-01 13:51:18 -06:00
Linus Torvalds 5c6207539a Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull mount_capable() fix from Al Viro.

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  Unbreak mount_capable()
2019-07-31 13:26:54 -07:00
Andreas Gruenbacher 706cb5492c gfs2: Inode dirtying fix
With the recent iomap write page reclaim deadlock fix, it turns out that the
GLF_DIRTY flag isn't always set when it needs to be anymore: previously, this
happened as a side effect of always adding the inode buffer head to the current
transaction with gfs2_trans_add_meta, but this isn't happening consistently
anymore.  Fix by removing an additional unnecessary gfs2_trans_add_meta call
and by setting the GLF_DIRTY flag in gfs2_iomap_end.

(The GLF_DIRTY flag causes inode_go_sync to flush the transaction log when
syncing out the glock of that inode.  When the flag isn't set, inode_go_sync
will skip inodes, including ones with an i_state of I_DIRTY_PAGES, which will
lead to cluster incoherency.)

In addition, in gfs2_iomap_page_done, if the metadata has changed, mark the
inode as I_DIRTY_DATASYNC to have the inode added to the current transaction:
we don't expect metadata to change here, but let's err on the safe side.

Fixes: d0a22a4b03 ("gfs2: Fix iomap write page reclaim deadlock");
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2019-07-31 18:51:50 +02:00
Al Viro c2c44ec20a Unbreak mount_capable()
In "consolidate the capability checks in sget_{fc,userns}())" the
wrong argument had been passed to mount_capable() by sget_fc().
That mistake had been further obscured later, when switching
mount_capable() to fs_context has moved the calculation of
bogus argument from sget_fc() to mount_capable() itself.  It
should've been fc->user_ns all along.

Screwed-up-by: Al Viro <viro@zeniv.linux.org.uk>
Reported-by: Christian Brauner <christian@brauner.io>
Tested-by: Christian Brauner <christian@brauner.io>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-07-31 12:22:32 -04:00
Jackie Liu d0ee879187 io_uring: fix KASAN use after free in io_sq_wq_submit_work
[root@localhost ~]# ./liburing/test/link

QEMU Standard PC report that:

[   29.379892] CPU: 0 PID: 84 Comm: kworker/u2:2 Not tainted 5.3.0-rc2-00051-g4010b622f1d2-dirty #86
[   29.379902] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   29.379913] Workqueue: io_ring-wq io_sq_wq_submit_work
[   29.379929] Call Trace:
[   29.379953]  dump_stack+0xa9/0x10e
[   29.379970]  ? io_sq_wq_submit_work+0xbf4/0xe90
[   29.379986]  print_address_description.cold.6+0x9/0x317
[   29.379999]  ? io_sq_wq_submit_work+0xbf4/0xe90
[   29.380010]  ? io_sq_wq_submit_work+0xbf4/0xe90
[   29.380026]  __kasan_report.cold.7+0x1a/0x34
[   29.380044]  ? io_sq_wq_submit_work+0xbf4/0xe90
[   29.380061]  kasan_report+0xe/0x12
[   29.380076]  io_sq_wq_submit_work+0xbf4/0xe90
[   29.380104]  ? io_sq_thread+0xaf0/0xaf0
[   29.380152]  process_one_work+0xb59/0x19e0
[   29.380184]  ? pwq_dec_nr_in_flight+0x2c0/0x2c0
[   29.380221]  worker_thread+0x8c/0xf40
[   29.380248]  ? __kthread_parkme+0xab/0x110
[   29.380265]  ? process_one_work+0x19e0/0x19e0
[   29.380278]  kthread+0x30b/0x3d0
[   29.380292]  ? kthread_create_on_node+0xe0/0xe0
[   29.380311]  ret_from_fork+0x3a/0x50

[   29.380635] Allocated by task 209:
[   29.381255]  save_stack+0x19/0x80
[   29.381268]  __kasan_kmalloc.constprop.6+0xc1/0xd0
[   29.381279]  kmem_cache_alloc+0xc0/0x240
[   29.381289]  io_submit_sqe+0x11bc/0x1c70
[   29.381300]  io_ring_submit+0x174/0x3c0
[   29.381311]  __x64_sys_io_uring_enter+0x601/0x780
[   29.381322]  do_syscall_64+0x9f/0x4d0
[   29.381336]  entry_SYSCALL_64_after_hwframe+0x49/0xbe

[   29.381633] Freed by task 84:
[   29.382186]  save_stack+0x19/0x80
[   29.382198]  __kasan_slab_free+0x11d/0x160
[   29.382210]  kmem_cache_free+0x8c/0x2f0
[   29.382220]  io_put_req+0x22/0x30
[   29.382230]  io_sq_wq_submit_work+0x28b/0xe90
[   29.382241]  process_one_work+0xb59/0x19e0
[   29.382251]  worker_thread+0x8c/0xf40
[   29.382262]  kthread+0x30b/0x3d0
[   29.382272]  ret_from_fork+0x3a/0x50

[   29.382569] The buggy address belongs to the object at ffff888067172140
                which belongs to the cache io_kiocb of size 224
[   29.384692] The buggy address is located 120 bytes inside of
                224-byte region [ffff888067172140, ffff888067172220)
[   29.386723] The buggy address belongs to the page:
[   29.387575] page:ffffea00019c5c80 refcount:1 mapcount:0 mapping:ffff88806ace5180 index:0x0
[   29.387587] flags: 0x100000000000200(slab)
[   29.387603] raw: 0100000000000200 dead000000000100 dead000000000122 ffff88806ace5180
[   29.387617] raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
[   29.387624] page dumped because: kasan: bad access detected

[   29.387920] Memory state around the buggy address:
[   29.388771]  ffff888067172080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[   29.390062]  ffff888067172100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
[   29.391325] >ffff888067172180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   29.392578]                                         ^
[   29.393480]  ffff888067172200: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   29.394744]  ffff888067172280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   29.396003] ==================================================================
[   29.397260] Disabling lock debugging due to kernel taint

io_sq_wq_submit_work free and read req again.

Cc: Zhengyuan Liu <liuzhengyuan@kylinos.cn>
Cc: linux-block@vger.kernel.org
Cc: stable@vger.kernel.org
Fixes: f7b76ac9d1 ("io_uring: fix counter inc/dec mismatch in async_list")
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-07-31 08:45:10 -06:00
Linus Torvalds 4010b622f1 Merge branch 'dax-fix-5.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull dax fix from Dan Williams:
 "Fix a botched manual patch update that got dropped between testing and
  application"

* 'dax-fix-5.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  dax: Fix missed wakeup in put_unlocked_entry()
2019-07-30 17:32:46 -07:00
Arnd Bergmann 055d88242a compat_ioctl: pppoe: fix PPPOEIOCSFWD handling
Support for handling the PPPOEIOCSFWD ioctl in compat mode was added in
linux-2.5.69 along with hundreds of other commands, but was always broken
sincen only the structure is compatible, but the command number is not,
due to the size being sizeof(size_t), or at first sizeof(sizeof((struct
sockaddr_pppox)), which is different on 64-bit architectures.

Guillaume Nault adds:

  And the implementation was broken until 2016 (see 29e73269aa ("pppoe:
  fix reference counting in PPPoE proxy")), and nobody ever noticed. I
  should probably have removed this ioctl entirely instead of fixing it.
  Clearly, it has never been used.

Fix it by adding a compat_ioctl handler for all pppoe variants that
translates the command number and then calls the regular ioctl function.

All other ioctl commands handled by pppoe are compatible between 32-bit
and 64-bit, and require compat_ptr() conversion.

This should apply to all stable kernels.

Acked-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-07-30 14:42:13 -07:00
Linus Torvalds 0572d7668a f2fs-for-5.4-rc3
This set of patches adjust to follow recent setflags changes and fix two
 regression introduced since 5.4-rc1.
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Merge tag 'f2fs-for-5.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs fixes from Jaegeuk Kim:
 "This set of patches adjust to follow recent setflags changes and fix
  two regressions"

* tag 'f2fs-for-5.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs:
  f2fs: use EINVAL for superblock with invalid magic
  f2fs: fix to read source block before invalidating it
  f2fs: remove redundant check from f2fs_setflags_common()
  f2fs: use generic checking function for FS_IOC_FSSETXATTR
  f2fs: use generic checking and prep function for FS_IOC_SETFLAGS
2019-07-30 13:15:39 -07:00
Jan Kara 89e524c04f loop: Fix mount(2) failure due to race with LOOP_SET_FD
Commit 33ec3e53e7 ("loop: Don't change loop device under exclusive
opener") made LOOP_SET_FD ioctl acquire exclusive block device reference
while it updates loop device binding. However this can make perfectly
valid mount(2) fail with EBUSY due to racing LOOP_SET_FD holding
temporarily the exclusive bdev reference in cases like this:

for i in {a..z}{a..z}; do
        dd if=/dev/zero of=$i.image bs=1k count=0 seek=1024
        mkfs.ext2 $i.image
        mkdir mnt$i
done

echo "Run"
for i in {a..z}{a..z}; do
        mount -o loop -t ext2 $i.image mnt$i &
done

Fix the problem by not getting full exclusive bdev reference in
LOOP_SET_FD but instead just mark the bdev as being claimed while we
update the binding information. This just blocks new exclusive openers
instead of failing them with EBUSY thus fixing the problem.

Fixes: 33ec3e53e7 ("loop: Don't change loop device under exclusive opener")
Cc: stable@vger.kernel.org
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-07-30 13:16:57 -06:00
Jia-Ju Bai afa1d96d14 xfs: Fix possible null-pointer dereferences in xchk_da_btree_block_check_sibling()
In xchk_da_btree_block_check_sibling(), there is an if statement on
line 274 to check whether ds->state->altpath.blk[level].bp is NULL:
    if (ds->state->altpath.blk[level].bp)

When ds->state->altpath.blk[level].bp is NULL, it is used on line 281:
    xfs_trans_brelse(..., ds->state->altpath.blk[level].bp);
        struct xfs_buf_log_item *bip = bp->b_log_item;
        ASSERT(bp->b_transp == tp);

Thus, possible null-pointer dereferences may occur.

To fix these bugs, ds->state->altpath.blk[level].bp is checked before
being used.

These bugs are found by a static analysis tool STCheck written by us.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-07-30 11:28:20 -07:00
Filipe Manana a6d155d2e3 Btrfs: fix deadlock between fiemap and transaction commits
The fiemap handler locks a file range that can have unflushed delalloc,
and after locking the range, it tries to attach to a running transaction.
If the running transaction started its commit, that is, it is in state
TRANS_STATE_COMMIT_START, and either the filesystem was mounted with the
flushoncommit option or the transaction is creating a snapshot for the
subvolume that contains the file that fiemap is operating on, we end up
deadlocking. This happens because fiemap is blocked on the transaction,
waiting for it to complete, and the transaction is waiting for the flushed
dealloc to complete, which requires locking the file range that the fiemap
task already locked. The following stack traces serve as an example of
when this deadlock happens:

  (...)
  [404571.515510] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
  [404571.515956] Call Trace:
  [404571.516360]  ? __schedule+0x3ae/0x7b0
  [404571.516730]  schedule+0x3a/0xb0
  [404571.517104]  lock_extent_bits+0x1ec/0x2a0 [btrfs]
  [404571.517465]  ? remove_wait_queue+0x60/0x60
  [404571.517832]  btrfs_finish_ordered_io+0x292/0x800 [btrfs]
  [404571.518202]  normal_work_helper+0xea/0x530 [btrfs]
  [404571.518566]  process_one_work+0x21e/0x5c0
  [404571.518990]  worker_thread+0x4f/0x3b0
  [404571.519413]  ? process_one_work+0x5c0/0x5c0
  [404571.519829]  kthread+0x103/0x140
  [404571.520191]  ? kthread_create_worker_on_cpu+0x70/0x70
  [404571.520565]  ret_from_fork+0x3a/0x50
  [404571.520915] kworker/u8:6    D    0 31651      2 0x80004000
  [404571.521290] Workqueue: btrfs-flush_delalloc btrfs_flush_delalloc_helper [btrfs]
  (...)
  [404571.537000] fsstress        D    0 13117  13115 0x00004000
  [404571.537263] Call Trace:
  [404571.537524]  ? __schedule+0x3ae/0x7b0
  [404571.537788]  schedule+0x3a/0xb0
  [404571.538066]  wait_current_trans+0xc8/0x100 [btrfs]
  [404571.538349]  ? remove_wait_queue+0x60/0x60
  [404571.538680]  start_transaction+0x33c/0x500 [btrfs]
  [404571.539076]  btrfs_check_shared+0xa3/0x1f0 [btrfs]
  [404571.539513]  ? extent_fiemap+0x2ce/0x650 [btrfs]
  [404571.539866]  extent_fiemap+0x2ce/0x650 [btrfs]
  [404571.540170]  do_vfs_ioctl+0x526/0x6f0
  [404571.540436]  ksys_ioctl+0x70/0x80
  [404571.540734]  __x64_sys_ioctl+0x16/0x20
  [404571.540997]  do_syscall_64+0x60/0x1d0
  [404571.541279]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
  (...)
  [404571.543729] btrfs           D    0 14210  14208 0x00004000
  [404571.544023] Call Trace:
  [404571.544275]  ? __schedule+0x3ae/0x7b0
  [404571.544526]  ? wait_for_completion+0x112/0x1a0
  [404571.544795]  schedule+0x3a/0xb0
  [404571.545064]  schedule_timeout+0x1ff/0x390
  [404571.545351]  ? lock_acquire+0xa6/0x190
  [404571.545638]  ? wait_for_completion+0x49/0x1a0
  [404571.545890]  ? wait_for_completion+0x112/0x1a0
  [404571.546228]  wait_for_completion+0x131/0x1a0
  [404571.546503]  ? wake_up_q+0x70/0x70
  [404571.546775]  btrfs_wait_ordered_extents+0x27c/0x400 [btrfs]
  [404571.547159]  btrfs_commit_transaction+0x3b0/0xae0 [btrfs]
  [404571.547449]  ? btrfs_mksubvol+0x4a4/0x640 [btrfs]
  [404571.547703]  ? remove_wait_queue+0x60/0x60
  [404571.547969]  btrfs_mksubvol+0x605/0x640 [btrfs]
  [404571.548226]  ? __sb_start_write+0xd4/0x1c0
  [404571.548512]  ? mnt_want_write_file+0x24/0x50
  [404571.548789]  btrfs_ioctl_snap_create_transid+0x169/0x1a0 [btrfs]
  [404571.549048]  btrfs_ioctl_snap_create_v2+0x11d/0x170 [btrfs]
  [404571.549307]  btrfs_ioctl+0x133f/0x3150 [btrfs]
  [404571.549549]  ? mem_cgroup_charge_statistics+0x4c/0xd0
  [404571.549792]  ? mem_cgroup_commit_charge+0x84/0x4b0
  [404571.550064]  ? __handle_mm_fault+0xe3e/0x11f0
  [404571.550306]  ? do_raw_spin_unlock+0x49/0xc0
  [404571.550608]  ? _raw_spin_unlock+0x24/0x30
  [404571.550976]  ? __handle_mm_fault+0xedf/0x11f0
  [404571.551319]  ? do_vfs_ioctl+0xa2/0x6f0
  [404571.551659]  ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs]
  [404571.552087]  do_vfs_ioctl+0xa2/0x6f0
  [404571.552355]  ksys_ioctl+0x70/0x80
  [404571.552621]  __x64_sys_ioctl+0x16/0x20
  [404571.552864]  do_syscall_64+0x60/0x1d0
  [404571.553104]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
  (...)

If we were joining the transaction instead of attaching to it, we would
not risk a deadlock because a join only blocks if the transaction is in a
state greater then or equals to TRANS_STATE_COMMIT_DOING, and the delalloc
flush performed by a transaction is done before it reaches that state,
when it is in the state TRANS_STATE_COMMIT_START. However a transaction
join is intended for use cases where we do modify the filesystem, and
fiemap only needs to peek at delayed references from the current
transaction in order to determine if extents are shared, and, besides
that, when there is no current transaction or when it blocks to wait for
a current committing transaction to complete, it creates a new transaction
without reserving any space. Such unnecessary transactions, besides doing
unnecessary IO, can cause transaction aborts (-ENOSPC) and unnecessary
rotation of the precious backup roots.

So fix this by adding a new transaction join variant, named join_nostart,
which behaves like the regular join, but it does not create a transaction
when none currently exists or after waiting for a committing transaction
to complete.

Fixes: 03628cdbc6 ("Btrfs: do not start a transaction during fiemap")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-30 18:25:12 +02:00
Filipe Manana cb2d3daddb Btrfs: fix race leading to fs corruption after transaction abort
When one transaction is finishing its commit, it is possible for another
transaction to start and enter its initial commit phase as well. If the
first ends up getting aborted, we have a small time window where the second
transaction commit does not notice that the previous transaction aborted
and ends up committing, writing a superblock that points to btrees that
reference extent buffers (nodes and leafs) that were not persisted to disk.
The consequence is that after mounting the filesystem again, we will be
unable to load some btree nodes/leafs, either because the content on disk
is either garbage (or just zeroes) or corresponds to the old content of a
previouly COWed or deleted node/leaf, resulting in the well known error
messages "parent transid verify failed on ...".
The following sequence diagram illustrates how this can happen.

        CPU 1                                           CPU 2

 <at transaction N>

 btrfs_commit_transaction()
   (...)
   --> sets transaction state to
       TRANS_STATE_UNBLOCKED
   --> sets fs_info->running_transaction
       to NULL

                                                    (...)
                                                    btrfs_start_transaction()
                                                      start_transaction()
                                                        wait_current_trans()
                                                          --> returns immediately
                                                              because
                                                              fs_info->running_transaction
                                                              is NULL
                                                        join_transaction()
                                                          --> creates transaction N + 1
                                                          --> sets
                                                              fs_info->running_transaction
                                                              to transaction N + 1
                                                          --> adds transaction N + 1 to
                                                              the fs_info->trans_list list
                                                        --> returns transaction handle
                                                            pointing to the new
                                                            transaction N + 1
                                                    (...)

                                                    btrfs_sync_file()
                                                      btrfs_start_transaction()
                                                        --> returns handle to
                                                            transaction N + 1
                                                      (...)

   btrfs_write_and_wait_transaction()
     --> writeback of some extent
         buffer fails, returns an
	 error
   btrfs_handle_fs_error()
     --> sets BTRFS_FS_STATE_ERROR in
         fs_info->fs_state
   --> jumps to label "scrub_continue"
   cleanup_transaction()
     btrfs_abort_transaction(N)
       --> sets BTRFS_FS_STATE_TRANS_ABORTED
           flag in fs_info->fs_state
       --> sets aborted field in the
           transaction and transaction
	   handle structures, for
           transaction N only
     --> removes transaction from the
         list fs_info->trans_list
                                                      btrfs_commit_transaction(N + 1)
                                                        --> transaction N + 1 was not
							    aborted, so it proceeds
                                                        (...)
                                                        --> sets the transaction's state
                                                            to TRANS_STATE_COMMIT_START
                                                        --> does not find the previous
                                                            transaction (N) in the
                                                            fs_info->trans_list, so it
                                                            doesn't know that transaction
                                                            was aborted, and the commit
                                                            of transaction N + 1 proceeds
                                                        (...)
                                                        --> sets transaction N + 1 state
                                                            to TRANS_STATE_UNBLOCKED
                                                        btrfs_write_and_wait_transaction()
                                                          --> succeeds writing all extent
                                                              buffers created in the
                                                              transaction N + 1
                                                        write_all_supers()
                                                           --> succeeds
                                                           --> we now have a superblock on
                                                               disk that points to trees
                                                               that refer to at least one
                                                               extent buffer that was
                                                               never persisted

So fix this by updating the transaction commit path to check if the flag
BTRFS_FS_STATE_TRANS_ABORTED is set on fs_info->fs_state if after setting
the transaction to the TRANS_STATE_COMMIT_START we do not find any previous
transaction in the fs_info->trans_list. If the flag is set, just fail the
transaction commit with -EROFS, as we do in other places. The exact error
code for the previous transaction abort was already logged and reported.

Fixes: 49b25e0540 ("btrfs: enhance transaction abort infrastructure")
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-30 18:25:12 +02:00
Filipe Manana b4f9a1a87a Btrfs: fix incremental send failure after deduplication
When doing an incremental send operation we can fail if we previously did
deduplication operations against a file that exists in both snapshots. In
that case we will fail the send operation with -EIO and print a message
to dmesg/syslog like the following:

  BTRFS error (device sdc): Send: inconsistent snapshot, found updated \
  extent for inode 257 without updated inode item, send root is 258, \
  parent root is 257

This requires that we deduplicate to the same file in both snapshots for
the same amount of times on each snapshot. The issue happens because a
deduplication only updates the iversion of an inode and does not update
any other field of the inode, therefore if we deduplicate the file on
each snapshot for the same amount of time, the inode will have the same
iversion value (stored as the "sequence" field on the inode item) on both
snapshots, therefore it will be seen as unchanged between in the send
snapshot while there are new/updated/deleted extent items when comparing
to the parent snapshot. This makes the send operation return -EIO and
print an error message.

Example reproducer:

  $ mkfs.btrfs -f /dev/sdb
  $ mount /dev/sdb /mnt

  # Create our first file. The first half of the file has several 64Kb
  # extents while the second half as a single 512Kb extent.
  $ xfs_io -f -s -c "pwrite -S 0xb8 -b 64K 0 512K" /mnt/foo
  $ xfs_io -c "pwrite -S 0xb8 512K 512K" /mnt/foo

  # Create the base snapshot and the parent send stream from it.
  $ btrfs subvolume snapshot -r /mnt /mnt/mysnap1
  $ btrfs send -f /tmp/1.snap /mnt/mysnap1

  # Create our second file, that has exactly the same data as the first
  # file.
  $ xfs_io -f -c "pwrite -S 0xb8 0 1M" /mnt/bar

  # Create the second snapshot, used for the incremental send, before
  # doing the file deduplication.
  $ btrfs subvolume snapshot -r /mnt /mnt/mysnap2

  # Now before creating the incremental send stream:
  #
  # 1) Deduplicate into a subrange of file foo in snapshot mysnap1. This
  #    will drop several extent items and add a new one, also updating
  #    the inode's iversion (sequence field in inode item) by 1, but not
  #    any other field of the inode;
  #
  # 2) Deduplicate into a different subrange of file foo in snapshot
  #    mysnap2. This will replace an extent item with a new one, also
  #    updating the inode's iversion by 1 but not any other field of the
  #    inode.
  #
  # After these two deduplication operations, the inode items, for file
  # foo, are identical in both snapshots, but we have different extent
  # items for this inode in both snapshots. We want to check this doesn't
  # cause send to fail with an error or produce an incorrect stream.

  $ xfs_io -r -c "dedupe /mnt/bar 0 0 512K" /mnt/mysnap1/foo
  $ xfs_io -r -c "dedupe /mnt/bar 512K 512K 512K" /mnt/mysnap2/foo

  # Create the incremental send stream.
  $ btrfs send -p /mnt/mysnap1 -f /tmp/2.snap /mnt/mysnap2
  ERROR: send ioctl failed with -5: Input/output error

This issue started happening back in 2015 when deduplication was updated
to not update the inode's ctime and mtime and update only the iversion.
Back then we would hit a BUG_ON() in send, but later in 2016 send was
updated to return -EIO and print the error message instead of doing the
BUG_ON().

A test case for fstests follows soon.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203933
Fixes: 1c919a5e13 ("btrfs: don't update mtime/ctime on deduped inodes")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-30 18:25:11 +02:00
Jan Kara 61c30c98ef dax: Fix missed wakeup in put_unlocked_entry()
The condition checking whether put_unlocked_entry() needs to wake up
following waiter got broken by commit 23c84eb783 ("dax: Fix missed
wakeup with PMD faults"). We need to wake the waiter whenever the passed
entry is valid (i.e., non-NULL and not special conflict entry). This
could lead to processes never being woken up when waiting for entry
lock. Fix the condition.

Cc: <stable@vger.kernel.org>
Link: http://lore.kernel.org/r/20190729120228.GC17833@quack2.suse.cz
Fixes: 23c84eb783 ("dax: Fix missed wakeup with PMD faults")
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2019-07-29 09:24:22 -07:00
Icenowy Zheng 38fb6d0ea3 f2fs: use EINVAL for superblock with invalid magic
The kernel mount_block_root() function expects -EACESS or -EINVAL for a
unmountable filesystem when trying to mount the root with different
filesystem types.

However, in 5.3-rc1 the behavior when F2FS code cannot find valid block
changed to return -EFSCORRUPTED(-EUCLEAN), and this error code makes
mount_block_root() fail when trying to probe F2FS.

When the magic number of the superblock mismatches, it has a high
probability that it's just not a F2FS. In this case return -EINVAL seems
to be a better result, and this return value can make mount_block_root()
probing work again.

Return -EINVAL when the superblock has magic mismatch, -EFSCORRUPTED in
other cases (the magic matches but the superblock cannot be recognized).

Fixes: 10f966bbf5 ("f2fs: use generic EFSBADCRC/EFSCORRUPTED")
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
2019-07-28 22:59:14 -07:00
Darrick J. Wong 2e616d9f9c xfs: fix stack contents leakage in the v1 inumber ioctls
Explicitly initialize the onstack structures to zero so we don't leak
kernel memory into userspace when converting the in-core inumbers
structure to the v1 inogrp ioctl structure.  Add a comment about why we
have to use memset to ensure that the padding holes in the structures
are set to zero.

Fixes: 5f19c7fc68 ("xfs: introduce v5 inode group structure")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
2019-07-28 21:12:32 -07:00