1. 20 Jun, 2013 2 commits
  2. 19 Jun, 2013 6 commits
  3. 18 Jun, 2013 3 commits
  4. 17 Jun, 2013 9 commits
    • Sebastian Siewior's avatar
      net: cpsw: check for cpts pointer after its allocation · ab8e99d2
      Sebastian Siewior authored
      after priv->cpts got allocated then this pointer should check to determine
      if the allocation succeeded or not.
      
      Cc: Mugunthan V N <mugunthanvnm@ti.com>
      Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ab8e99d2
    • David S. Miller's avatar
      Merge branch 'for-davem' of... · c5b248dd
      David S. Miller authored
      Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into wireless
      
      John W. Linville says:
      
      ====================
      This will probably be the last batch of wireless fixes intended
      for 3.10.  Many of these are one- or two-liners, and a couple of
      others are mostly relocating existing code to avoid races or to
      limit the code to effecting specific hardware, etc.
      
      The mac80211 fixes have a couple of exceptions to the above.
      Regarding those, Johannes says:
      
      "Following davem's complaint about my patch, here's a new pull request
      w/o the patch he was complaining about, but instead with the const
      fix rolled into the fix.
      
      I have a fix for radar detection, one for rate control and a workaround
      for broken HT APs which is a regression fix because we didn't rely
      on them to be correct before."
      
      Johannes also sends some iwlwifi fixes:
      
      "I picked up Nikolay's patch for the chain noise calibration bug
      that seems to have been there forever, a fix from Emmanuel for
      setting TX flags on BAR frames and a fix of my own to avoid printing
      request_module() errors if the kernel isn't even modular. We also
      have our own version of Stanislaw's fix for rate control."
      
      Along with those...
      
      Anderson Lizardo fixes a Bluetooth memory corruption bug when an MTU
      value is set to too small of a value.
      
      Arend van Spriel sends a revised brcmsmac bug that fixes a regression
      caused by a bad return value in an earlier patch.  He also sends a
      brcmfmac fix to avoid an oops when loading the driver at boot.
      
      Daniel Drake fixes a race condition in btmrvl that causes hangs on
      suspend for OLPC hardware.
      
      Johan Hedberg adds a check to avoid sending a
      HCI_Delete_Stored_Link_Key command to devices that don't support them,
      avoiding some scary looking log spam.
      
      Stanislaw Gruszka gives us a fix for iwlegacy to be able to use rates
      higher than 1Mb/s on older wireless networks.  He also sends an rt2x00
      fix to reinstate older tx power handling behavior for some devices
      that didn't work well with the current code.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c5b248dd
    • David S. Miller's avatar
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf · e00c7f1f
      David S. Miller authored
      Pablo Neira Ayuso says:
      
      ====================
      The following patchset contains Netfilter fixes. They are targeted to the
      TCP option targets, that have receive some scrinity in the last week. The
      changes are:
      
      * Fix TCPOPTSTRIP, it stopped working in the forward chain as tcp_hdr
        uses skb->transport_header, and we cannot use that in the forwarding
        case, from myself.
      
      * Fix default IPv6 MSS in TCPMSS in case of absence of TCP MSS options,
        from Phil Oester.
      
      * Fix missing fragmentation handling again in TCPMSS, from Phil Oester.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e00c7f1f
    • Johannes Berg's avatar
      alx: add a simple AR816x/AR817x device driver · ab69bde6
      Johannes Berg authored
      This is a very simple driver, based on the original vendor
      driver that Qualcomm/Atheros published/submitted previously,
      but reworked to make the code saner. However, it also lost
      a number of features (TSO/GSO, VLAN acceleration and multi-
      queue support) in the process, as well as debugging support
      features I didn't have any use for. The only thing I left
      is checksum offload.
      
      More features can obviously be added, but this seemed like
      a good start for having a driver in mainline at all.
      
      Johannes Stezenbach has verified that the driver works on
      AR8161, I have a AR8171 myself. The E2200 device ID I found
      on github in somebody's repository.
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ab69bde6
    • Haiyang Zhang's avatar
      Fix the VLAN_TAG_PRESENT in netvsc_recv_callback() · 93725cbd
      Haiyang Zhang authored
      We should call __vlan_hwaccel_put_tag() only if the packet
      comes from vlan, otherwise VLAN_TAG_PRESENT will always be
      added.
      Reported-by: default avatarOlaf Hering <olaf@aepfle.de>
      Signed-off-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
      Reviewed-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      93725cbd
    • stephen hemminger's avatar
      vxlan: handle skb_clone failure · 7aa27238
      stephen hemminger authored
      If skb_clone fails if out of memory then just skip the fanout.
      
      Problem was introduced in 3.10 with:
        commit 6681712d
        Author: David Stevens <dlstevens@us.ibm.com>
        Date:   Fri Mar 15 04:35:51 2013 +0000
      
          vxlan: generalize forwarding tables
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7aa27238
    • stephen hemminger's avatar
      vxlan: only migrate dynamic FDB entries · 26a41ae6
      stephen hemminger authored
      Only migrate dynamic forwarding table entries, don't modify
      static entries. If packet received from incorrect source IP address
      assume it is an imposter and drop it.
      
      This patch applies only to -net, a different patch would be needed for earlier
      kernels since the NTF_SELF flag was introduced with 3.10.
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      26a41ae6
    • stephen hemminger's avatar
      vxlan: fix race between flush and incoming learning · 3bf74b1a
      stephen hemminger authored
      It is possible for a packet to arrive during vxlan_stop(), and
      have a dynamic entry created. Close this by checking if device
      is up.
      
       CPU1                             CPU2
      vxlan_stop
        vxlan_flush
           hash_lock acquired
                                        vxlan_encap_recv
                                           vxlan_snoop
                                              waiting for hash_lock
           hash_lock relased
        vxlan_flush done
                                              hash_lock acquired
                                              vxlan_fdb_create
      
      This is a day-one bug in vxlan goes back to 3.7.
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3bf74b1a
    • John W. Linville's avatar
      Merge branch 'master' of... · 722a300b
      John W. Linville authored
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem
      722a300b
  5. 16 Jun, 2013 1 commit
  6. 15 Jun, 2013 16 commits
    • Linus Torvalds's avatar
      Linux 3.10-rc6 · 7d132055
      Linus Torvalds authored
      7d132055
    • Linus Torvalds's avatar
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · e6694d98
      Linus Torvalds authored
      Pull ARM SoC fixes from Olof Johansson:
       "These are a little later than I planned on since I got caught up with
        handling merges for 3.11 most of the week.
      
        Another week, another batch of fixes for arm-soc platforms.
      
        Again, nothing controversial.  A few more than would be ideal, but all
        are valid fixes.  In particular the prima2 panic patch is critical
        since it fixes a problem where multiplatform kernels panic on all but
        prima2 hardware."
      
      * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
        ARM: SAMSUNG: pm: Adjust for pinctrl- and DT-enabled platforms
        ARM: prima2: fix incorrect panic usage
        arm: mvebu: armada-xp-{gp,openblocks-ax3-4}: specify PCIe range
        ARM: Kirkwood: handle mv88f6282 cpu in __kirkwood_variant().
        ARM: omap3: clock: fix wrong container_of in clock36xx.c
        ARM: dts: OMAP5: Fix missing PWM capability to timer nodes
        ARM: dts: omap4-panda|sdp: Fix mux for twl6030 IRQ pin and msecure line
        ARM: dts: AM33xx: Fix properties on gpmc node
        arm: omap2: fix AM33xx hwmod infos for UART2
        ARM: OMAP3: Fix iva2_pwrdm settings for 3703
      e6694d98
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 596fa9e6
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Fix RTNL locking in batman-adv, from Matthias Schiffer.
      
       2) Don't allow non-passthrough macvlan devices to set NOPROMISC via
          netlink, otherwise we can end up with corrupted promisc counter
          values on the device.  From Michael S Tsirkin.
      
       3) Fix stmmac driver build with debugging defines enabled, from Dinh
          Nguyen.
      
       4) Make sure name string we give in socket address in AF_PACKET is NULL
          terminated, from Daniel Borkmann.
      
       5) Fix leaking of two uninitialized bytes of memory to userspace in
          l2tp, from Guillaume Nault.
      
       6) Clear IPCB(skb) before tunneling otherwise we touch dangling IP
          options state and crash.  From Saurabh Mohan.
      
       7) Fix suspend/resume for davinci_mdio by using suspend_late and
          resume_early.  From Mugunthan V N.
      
       8) Don't tag ip_tunnel_init_net and ip_tunnel_delete_net with
          __net_{init,exit}, they can be called outside of those contexts.
          From Eric Dumazet.
      
       9) Fix RX length error in sh_eth driver, from Yoshihiro Shimoda.
      
      10) Fix missing sctp_outq initialization in some code paths of SCTP
          stack, from Neil Horman.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (21 commits)
        sctp: fully initialize sctp_outq in sctp_outq_init
        netiucv: Hold rtnl between name allocation and device registration.
        tulip: Properly check dma mapping result
        net: sh_eth: fix incorrect RX length error if R8A7740
        ip_tunnel: remove __net_init/exit from exported functions
        drivers: net: davinci_mdio: restore mdio clk divider in mdio resume
        drivers: net: davinci_mdio: moving mdio resume earlier than cpsw ethernet driver
        net/ipv4: ip_vti clear skb cb before tunneling.
        tg3: Wait for boot code to finish after power on
        l2tp: Fix sendmsg() return value
        l2tp: Fix PPP header erasure and memory leak
        bonding: fix igmp_retrans type and two related races
        bonding: reset master mac on first enslave failure
        packet: packet_getname_spkt: make sure string is always 0-terminated
        net: ethernet: stmicro: stmmac: Fix compile error when STMMAC_XMIT_DEBUG used
        be2net: Fix 32-bit DMA Mask handling
        xen-netback: don't de-reference vif pointer after having called xenvif_put()
        macvlan: don't touch promisc without passthrough
        batman-adv: Don't handle address updates when bla is disabled
        batman-adv: forward late OGMs from best next hop
        ...
      596fa9e6
    • Linus Torvalds's avatar
      Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc · 5938930e
      Linus Torvalds authored
      Pull powerpc fixes from Benjamin Herrenschmidt:
       "So here are 3 fixes still for 3.10.  Fixes are simple, bugs are nasty
        (though not recent regressions, nasty enough) and all targeted at
        stable"
      
      * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
        powerpc: Fix missing/delayed calls to irq_work
        powerpc: Fix emulation of illegal instructions on PowerNV platform
        powerpc: Fix stack overflow crash in resume_kernel when ftracing
      5938930e
    • David Daney's avatar
      smp.h: Use local_irq_{save,restore}() in !SMP version of on_each_cpu(). · f21afc25
      David Daney authored
      Thanks to commit f91eb62f ("init: scream bloody murder if interrupts
      are enabled too early"), "bloody murder" is now being screamed.
      
      With a MIPS OCTEON config, we use on_each_cpu() in our
      irq_chip.irq_bus_sync_unlock() function.  This gets called in early as a
      result of the time_init() call.  Because the !SMP version of
      on_each_cpu() unconditionally enables irqs, we get:
      
          WARNING: at init/main.c:560 start_kernel+0x250/0x410()
          Interrupts were enabled early
          CPU: 0 PID: 0 Comm: swapper Not tainted 3.10.0-rc5-Cavium-Octeon+ #801
          Call Trace:
            show_stack+0x68/0x80
            warn_slowpath_common+0x78/0xb0
            warn_slowpath_fmt+0x38/0x48
            start_kernel+0x250/0x410
      
      Suggested fix: Do what we already do in the SMP version of
      on_each_cpu(), and use local_irq_save/local_irq_restore.  Because we
      need a flags variable, make it a static inline to avoid name space
      issues.
      
      [ Change from v1: Convert on_each_cpu to a static inline function, add
        #include <linux/irqflags.h> to avoid build breakage on some files.
      
        on_each_cpu_mask() and on_each_cpu_cond() suffer the same problem as
        on_each_cpu(), but they are not causing !SMP bugs for me, so I will
        defer changing them to a less urgent patch. ]
      Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f21afc25
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · d0ff9348
      Linus Torvalds authored
      Pull VFS fixes from Al Viro:
       "Several fixes + obvious cleanup (you've missed a couple of open-coded
        can_lookup() back then)"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        snd_pcm_link(): fix a leak...
        use can_lookup() instead of direct checks of ->i_op->lookup
        move exit_task_namespaces() outside of exit_notify()
        fput: task_work_add() can fail if the caller has passed exit_task_work()
        ncpfs: fix rmdir returns Device or resource busy
      d0ff9348
    • Linus Torvalds's avatar
      Merge tag 'for-linus-v3.10-rc6' of git://oss.sgi.com/xfs/xfs · d58c6ff0
      Linus Torvalds authored
      Pull xfs fixes from Ben Myers:
       - Remove noisy warnings about experimental support which spams the logs
       - Add padding to align directory and attr structures correctly
       - Set block number on child buffer on a root btree split
       - Disable verifiers during log recovery for non-CRC filesystems
      
      * tag 'for-linus-v3.10-rc6' of git://oss.sgi.com/xfs/xfs:
        xfs: don't shutdown log recovery on validation errors
        xfs: ensure btree root split sets blkno correctly
        xfs: fix implicit padding in directory and attr CRC formats
        xfs: don't emit v5 superblock warnings on write
      d58c6ff0
    • Linus Torvalds's avatar
      Merge tag 'char-misc-3.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc · 9bb92855
      Linus Torvalds authored
      Pull char / misc fixes from Greg Kroah-Hartman:
       "Here are some small mei driver fixes for 3.10-rc6 that fix some
        reported problems"
      
      * tag 'char-misc-3.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
        mei: me: clear interrupts on the resume path
        mei: nfc: fix nfc device freeing
        mei: init: Flush scheduled work before resetting the device
      9bb92855
    • Linus Torvalds's avatar
      Merge tag 'usb-3.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · 3ad2e318
      Linus Torvalds authored
      Pull USB fixes from Greg Kroah-Hartman:
       "Here are some small USB driver fixes that resolve some reported
        problems for 3.10-rc6
      
        Nothing major, just 3 USB serial driver fixes, and two chipidea fixes"
      
      * tag 'usb-3.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
        usb: chipidea: fix id change handling
        usb: chipidea: fix no transceiver case
        USB: pl2303: fix device initialisation at open
        USB: spcp8x5: fix device initialisation at open
        USB: f81232: fix device initialisation at open
      3ad2e318
    • Benjamin Herrenschmidt's avatar
      powerpc: Fix missing/delayed calls to irq_work · 230b3034
      Benjamin Herrenschmidt authored
      When replaying interrupts (as a result of the interrupt occurring
      while soft-disabled), in the case of the decrementer, we are exclusively
      testing for a pending timer target. However we also use decrementer
      interrupts to trigger the new "irq_work", which in this case would
      be missed.
      
      This change the logic to force a replay in both cases of a timer
      boundary reached and a decrementer interrupt having actually occurred
      while disabled. The former test is still useful to catch cases where
      a CPU having been hard-disabled for a long time completely misses the
      interrupt due to a decrementer rollover.
      
      CC: <stable@vger.kernel.org> [v3.4+]
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Tested-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      230b3034
    • Paul Mackerras's avatar
      powerpc: Fix emulation of illegal instructions on PowerNV platform · bf593907
      Paul Mackerras authored
      Normally, the kernel emulates a few instructions that are unimplemented
      on some processors (e.g. the old dcba instruction), or privileged (e.g.
      mfpvr).  The emulation of unimplemented instructions is currently not
      working on the PowerNV platform.  The reason is that on these machines,
      unimplemented and illegal instructions cause a hypervisor emulation
      assist interrupt, rather than a program interrupt as on older CPUs.
      Our vector for the emulation assist interrupt just calls
      program_check_exception() directly, without setting the bit in SRR1
      that indicates an illegal instruction interrupt.  This fixes it by
      making the emulation assist interrupt set that bit before calling
      program_check_interrupt().  With this, old programs that use no-longer
      implemented instructions such as dcba now work again.
      
      CC: <stable@vger.kernel.org>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      bf593907
    • Michael Ellerman's avatar
      powerpc: Fix stack overflow crash in resume_kernel when ftracing · 0e37739b
      Michael Ellerman authored
      It's possible for us to crash when running with ftrace enabled, eg:
      
        Bad kernel stack pointer bffffd12 at c00000000000a454
        cpu 0x3: Vector: 300 (Data Access) at [c00000000ffe3d40]
            pc: c00000000000a454: resume_kernel+0x34/0x60
            lr: c00000000000335c: performance_monitor_common+0x15c/0x180
            sp: bffffd12
           msr: 8000000000001032
           dar: bffffd12
         dsisr: 42000000
      
      If we look at current's stack (paca->__current->stack) we see it is
      equal to c0000002ecab0000. Our stack is 16K, and comparing to
      paca->kstack (c0000002ecab3e30) we can see that we have overflowed our
      kernel stack. This leads to us writing over our struct thread_info, and
      in this case we have corrupted thread_info->flags and set
      _TIF_EMULATE_STACK_STORE.
      
      Dumping the stack we see:
      
        3:mon> t c0000002ecab0000
        [c0000002ecab0000] c00000000002131c .performance_monitor_exception+0x5c/0x70
        [c0000002ecab0080] c00000000000335c performance_monitor_common+0x15c/0x180
        --- Exception: f01 (Performance Monitor) at c0000000000fb2ec .trace_hardirqs_off+0x1c/0x30
        [c0000002ecab0370] c00000000016fdb0 .trace_graph_entry+0xb0/0x280 (unreliable)
        [c0000002ecab0410] c00000000003d038 .prepare_ftrace_return+0x98/0x130
        [c0000002ecab04b0] c00000000000a920 .ftrace_graph_caller+0x14/0x28
        [c0000002ecab0520] c0000000000d6b58 .idle_cpu+0x18/0x90
        [c0000002ecab05a0] c00000000000a934 .return_to_handler+0x0/0x34
        [c0000002ecab0620] c00000000001e660 .timer_interrupt+0x160/0x300
        [c0000002ecab06d0] c0000000000025dc decrementer_common+0x15c/0x180
        --- Exception: 901 (Decrementer) at c0000000000104d4 .arch_local_irq_restore+0x74/0xa0
        [c0000002ecab09c0] c0000000000fe044 .trace_hardirqs_on+0x14/0x30 (unreliable)
        [c0000002ecab0fb0] c00000000016fe3c .trace_graph_entry+0x13c/0x280
        [c0000002ecab1050] c00000000003d038 .prepare_ftrace_return+0x98/0x130
        [c0000002ecab10f0] c00000000000a920 .ftrace_graph_caller+0x14/0x28
        [c0000002ecab1160] c0000000000161f0 .__ppc64_runlatch_on+0x10/0x40
        [c0000002ecab11d0] c00000000000a934 .return_to_handler+0x0/0x34
        --- Exception: 901 (Decrementer) at c0000000000104d4 .arch_local_irq_restore+0x74/0xa0
      
        ... and so on
      
      __ppc64_runlatch_on() is called from RUNLATCH_ON in the exception entry
      path. At that point the irq state is not consistent, ie. interrupts are
      hard disabled (by the exception entry), but the paca soft-enabled flag
      may be out of sync.
      
      This leads to the local_irq_restore() in trace_graph_entry() actually
      enabling interrupts, which we do not want. Because we have not yet
      reprogrammed the decrementer we immediately take another decrementer
      exception, and recurse.
      
      The fix is twofold. Firstly make sure we call DISABLE_INTS before
      calling RUNLATCH_ON. The badly named DISABLE_INTS actually reconciles
      the irq state in the paca with the hardware, making it safe again to
      call local_irq_save/restore().
      
      Although that should be sufficient to fix the bug, we also mark the
      runlatch routines as notrace. They are called very early in the
      exception entry and we are asking for trouble tracing them. They are
      also fairly uninteresting and tracing them just adds unnecessary
      overhead.
      
      [ This regression was introduced by fe1952fc
        "powerpc: Rework runlatch code" by myself --BenH
      ]
      
      CC: <stable@vger.kernel.org> [v3.4+]
      Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      0e37739b
    • Al Viro's avatar
      snd_pcm_link(): fix a leak... · dd6c5cd8
      Al Viro authored
      in case when snd_pcm_stream_linked(substream) is true, we end up leaking
      group.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      dd6c5cd8
    • Al Viro's avatar
      use can_lookup() instead of direct checks of ->i_op->lookup · 05252901
      Al Viro authored
      a couple of places got missed back when Linus has introduced that one...
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      05252901
    • Oleg Nesterov's avatar
      move exit_task_namespaces() outside of exit_notify() · 8aac6270
      Oleg Nesterov authored
      exit_notify() does exit_task_namespaces() after
      forget_original_parent(). This was needed to ensure that ->nsproxy
      can't be cleared prematurely, an exiting child we are going to
      reparent can do do_notify_parent() and use the parent's (ours) pid_ns.
      
      However, after 32084504 "pidns: use task_active_pid_ns in
      do_notify_parent" ->nsproxy != NULL is no longer needed, we rely
      on task_active_pid_ns().
      
      Move exit_task_namespaces() from exit_notify() to do_exit(), after
      exit_fs() and before exit_task_work().
      
      This solves the problem reported by Andrey, free_ipc_ns()->shm_destroy()
      does fput() which needs task_work_add().
      
      Note: this particular problem can be fixed if we change fput(), and
      that change makes sense anyway. But there is another reason to move
      the callsite. The original reason for exit_task_namespaces() from
      the middle of exit_notify() was subtle and it has already gone away,
      now this looks confusing. And this allows us do simplify exit_notify(),
      we can avoid unlock/lock(tasklist) and we can use ->exit_state instead
      of PF_EXITING in forget_original_parent().
      Reported-by: default avatarAndrey Vagin <avagin@openvz.org>
      Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
      Acked-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
      Acked-by: default avatarAndrey Vagin <avagin@openvz.org>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      8aac6270
    • Oleg Nesterov's avatar
      fput: task_work_add() can fail if the caller has passed exit_task_work() · e7b2c406
      Oleg Nesterov authored
      fput() assumes that it can't be called after exit_task_work() but
      this is not true, for example free_ipc_ns()->shm_destroy() can do
      this. In this case fput() silently leaks the file.
      
      Change it to fallback to delayed_fput_work if task_work_add() fails.
      The patch looks complicated but it is not, it changes the code from
      
      	if (PF_KTHREAD) {
      		schedule_work(...);
      		return;
      	}
      	task_work_add(...)
      
      to
      	if (!PF_KTHREAD) {
      		if (!task_work_add(...))
      			return;
      		/* fallback */
      	}
      	schedule_work(...);
      
      As for shm_destroy() in particular, we could make another fix but I
      think this change makes sense anyway. There could be another similar
      user, it is not safe to assume that task_work_add() can't fail.
      Reported-by: default avatarAndrey Vagin <avagin@openvz.org>
      Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      e7b2c406
  7. 14 Jun, 2013 3 commits
    • Dave Chinner's avatar
      xfs: don't shutdown log recovery on validation errors · d302cf1d
      Dave Chinner authored
      Unfortunately, we cannot guarantee that items logged multiple times
      and replayed by log recovery do not take objects back in time. When
      they are taken back in time, the go into an intermediate state which
      is corrupt, and hence verification that occurs on this intermediate
      state causes log recovery to abort with a corruption shutdown.
      
      Instead of causing a shutdown and unmountable filesystem, don't
      verify post-recovery items before they are written to disk. This is
      less than optimal, but there is no way to detect this issue for
      non-CRC filesystems If log recovery successfully completes, this
      will be undone and the object will be consistent by subsequent
      transactions that are replayed, so in most cases we don't need to
      take drastic action.
      
      For CRC enabled filesystems, leave the verifiers in place - we need
      to call them to recalculate the CRCs on the objects anyway. This
      recovery problem can be solved for such filesystems - we have a LSN
      stamped in all metadata at writeback time that we can to determine
      whether the item should be replayed or not. This is a separate piece
      of work, so is not addressed by this patch.
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Reviewed-by: default avatarBen Myers <bpm@sgi.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      (cherry picked from commit 9222a9cf)
      d302cf1d
    • Dave Chinner's avatar
      xfs: ensure btree root split sets blkno correctly · 088c9f67
      Dave Chinner authored
      For CRC enabled filesystems, the BMBT is rooted in an inode, so it
      passes through a different code path on root splits than the
      freespace and inode btrees. This is much less traversed by xfstests
      than the other trees. When testing on a 1k block size filesystem,
      I've been seeing ASSERT failures in generic/234 like:
      
      XFS: Assertion failed: cur->bc_btnum != XFS_BTNUM_BMAP || cur->bc_private.b.allocated == 0, file: fs/xfs/xfs_btree.c, line: 317
      
      which are generally preceded by a lblock check failure. I noticed
      this in the bmbt stats:
      
      $ pminfo -f xfs.btree.block_map
      
      xfs.btree.block_map.lookup
          value 39135
      
      xfs.btree.block_map.compare
          value 268432
      
      xfs.btree.block_map.insrec
          value 15786
      
      xfs.btree.block_map.delrec
          value 13884
      
      xfs.btree.block_map.newroot
          value 2
      
      xfs.btree.block_map.killroot
          value 0
      .....
      
      Very little coverage of root splits and merges. Indeed, on a 4k
      filesystem, block_map.newroot and block_map.killroot are both zero.
      i.e. the code is not exercised at all, and it's the only generic
      btree infrastructure operation that is not exercised by a default run
      of xfstests.
      
      Turns out that on a 1k filesystem, generic/234 accounts for one of
      those two root splits, and that is somewhat of a smoking gun. In
      fact, it's the same problem we saw in the directory/attr code where
      headers are memcpy()d from one block to another without updating the
      self describing metadata.
      
      Simple fix - when copying the header out of the root block, make
      sure the block number is updated correctly.
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Reviewed-by: default avatarBen Myers <bpm@sgi.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      (cherry picked from commit ade1335a)
      088c9f67
    • Dave Chinner's avatar
      xfs: fix implicit padding in directory and attr CRC formats · 5170711d
      Dave Chinner authored
      Michael L. Semon has been testing CRC patches on a 32 bit system and
      been seeing assert failures in the directory code from xfs/080.
      Thanks to Michael's heroic efforts with printk debugging, we found
      that the problem was that the last free space being left in the
      directory structure was too small to fit a unused tag structure and
      it was being corrupted and attempting to log a region out of bounds.
      Hence the assert failure looked something like:
      
      .....
      #5 calling xfs_dir2_data_log_unused() 36 32
      #1 4092 4095 4096
      #2 8182 8183 4096
      XFS: Assertion failed: first <= last && last < BBTOB(bp->b_length), file: fs/xfs/xfs_trans_buf.c, line: 568
      
      Where #1 showed the first region of the dup being logged (i.e. the
      last 4 bytes of a directory buffer) and #2 shows the corrupt values
      being calculated from the length of the dup entry which overflowed
      the size of the buffer.
      
      It turns out that the problem was not in the logging code, nor in
      the freespace handling code. It is an initial condition bug that
      only shows up on 32 bit systems. When a new buffer is initialised,
      where's the freespace that is set up:
      
      [  172.316249] calling xfs_dir2_leaf_addname() from xfs_dir_createname()
      [  172.316346] #9 calling xfs_dir2_data_log_unused()
      [  172.316351] #1 calling xfs_trans_log_buf() 60 63 4096
      [  172.316353] #2 calling xfs_trans_log_buf() 4094 4095 4096
      
      Note the offset of the first region being logged? It's 60 bytes into
      the buffer. Once I saw that, I pretty much knew that the bug was
      going to be caused by this.
      
      Essentially, all direct entries are rounded to 8 bytes in length,
      and all entries start with an 8 byte alignment. This means that we
      can decode inplace as variables are naturally aligned. With the
      directory data supposedly starting on a 8 byte boundary, and all
      entries padded to 8 bytes, the minimum freespace in a directory
      block is supposed to be 8 bytes, which is large enough to fit a
      unused data entry structure (6 bytes in size). The fact we only have
      4 bytes of free space indicates a directory data block alignment
      problem.
      
      And what do you know - there's an implicit hole in the directory
      data block header for the CRC format, which means the header is 60
      byte on 32 bit intel systems and 64 bytes on 64 bit systems. Needs
      padding. And while looking at the structures, I found the same
      problem in the attr leaf header. Fix them both.
      
      Note that this only affects 32 bit systems with CRCs enabled.
      Everything else is just fine. Note that CRC enabled filesystems created
      before this fix on such systems will not be readable with this fix
      applied.
      Reported-by: default avatarMichael L. Semon <mlsemon35@gmail.com>
      Debugged-by: default avatarMichael L. Semon <mlsemon35@gmail.com>
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Reviewed-by: default avatarBen Myers <bpm@sgi.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      (cherry picked from commit 8a1fd295)
      5170711d