1. 07 1月, 2011 9 次提交
    • N
      cifs: dont overwrite dentry name in d_revalidate · 79eb4dde
      Nick Piggin 提交于
      Use vfat's method for dealing with negative dentries to preserve case,
      rather than overwrite dentry name in d_revalidate, which is a bit ugly
      and also gets in the way of doing lock-free path walking.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      79eb4dde
    • N
      fs: change d_delete semantics · fe15ce44
      Nick Piggin 提交于
      Change d_delete from a dentry deletion notification to a dentry caching
      advise, more like ->drop_inode. Require it to be constant and idempotent,
      and not take d_lock. This is how all existing filesystems use the callback
      anyway.
      
      This makes fine grained dentry locking of dput and dentry lru scanning
      much simpler.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      fe15ce44
    • N
      fs: dcache documentation cleanup · 5eef7fa9
      Nick Piggin 提交于
      Remove redundant (and incorrect, since dcache RCU lookup) dentry locking
      documentation and point to the canonical document.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      5eef7fa9
    • N
      config fs: avoid switching ->d_op on live dentry · fbc8d4c0
      Nick Piggin 提交于
      Switching d_op on a live dentry is racy in general, so avoid it. In this case
      it is a negative dentry, which is safer, but there are still concurrent ops
      which may be called on d_op in that case (eg. d_revalidate). So in general
      a filesystem may not do this. Fix configfs so as not to do this.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      fbc8d4c0
    • N
      cgroup fs: avoid switching ->d_op on live dentry · 5adcee1d
      Nick Piggin 提交于
      Switching d_op on a live dentry is racy in general, so avoid it. In this case
      it is a negative dentry, which is safer, but there are still concurrent ops
      which may be called on d_op in that case (eg. d_revalidate). So in general
      a filesystem may not do this. Fix cgroupfs so as not to do this.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      5adcee1d
    • N
      fs: use fast counters for vfs caches · 3e880fb5
      Nick Piggin 提交于
      percpu_counter library generates quite nasty code, so unless you need
      to dynamically allocate counters or take fast approximate value, a
      simple per cpu set of counters is much better.
      
      The percpu_counter can never be made to work as well, because it has an
      indirection from pointer to percpu memory, and it can't use direct
      this_cpu_inc interfaces because it doesn't use static PER_CPU data, so
      code will always be worse.
      
      In the fastpath, it is the difference between this:
      
              incl %gs:nr_dentry      # nr_dentry
      
      and this:
      
              movl    percpu_counter_batch(%rip), %edx        # percpu_counter_batch,
              movl    $1, %esi        #,
              movq    $nr_dentry, %rdi        #,
              call    __percpu_counter_add    # (plus I clobber registers)
      
      __percpu_counter_add:
              pushq   %rbp    #
              movq    %rsp, %rbp      #,
              subq    $32, %rsp       #,
              movq    %rbx, -24(%rbp) #,
              movq    %r12, -16(%rbp) #,
              movq    %r13, -8(%rbp)  #,
              movq    %rdi, %rbx      # fbc, fbc
      #APP
      # 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
              movq %gs:kernel_stack,%rax      #, pfo_ret__
      # 0 "" 2
      #NO_APP
              incl    -8124(%rax)     # <variable>.preempt_count
              movq    32(%rdi), %r12  # <variable>.counters, tcp_ptr__
      #APP
      # 78 "lib/percpu_counter.c" 1
              add %gs:this_cpu_off, %r12      # this_cpu_off, tcp_ptr__
      # 0 "" 2
      #NO_APP
              movslq  (%r12),%r13     #* tcp_ptr__, tmp73
              movslq  %edx,%rax       # batch, batch
              addq    %rsi, %r13      # amount, count
              cmpq    %rax, %r13      # batch, count
              jge     .L27    #,
              negl    %edx    # tmp76
              movslq  %edx,%rdx       # tmp76, tmp77
              cmpq    %rdx, %r13      # tmp77, count
              jg      .L28    #,
      .L27:
              movq    %rbx, %rdi      # fbc,
              call    _raw_spin_lock  #
              addq    %r13, 8(%rbx)   # count, <variable>.count
              movq    %rbx, %rdi      # fbc,
              movl    $0, (%r12)      #,* tcp_ptr__
              call    _raw_spin_unlock        #
      .L29:
      #APP
      # 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1
              movq %gs:kernel_stack,%rax      #, pfo_ret__
      # 0 "" 2
      #NO_APP
              decl    -8124(%rax)     # <variable>.preempt_count
              movq    -8136(%rax), %rax       #, D.14625
              testb   $8, %al #, D.14625
              jne     .L32    #,
      .L31:
              movq    -24(%rbp), %rbx #,
              movq    -16(%rbp), %r12 #,
              movq    -8(%rbp), %r13  #,
              leave
              ret
              .p2align 4,,10
              .p2align 3
      .L28:
              movl    %r13d, (%r12)   # count,*
              jmp     .L29    #
      .L32:
              call    preempt_schedule        #
              .p2align 4,,6
              jmp     .L31    #
              .size   __percpu_counter_add, .-__percpu_counter_add
              .p2align 4,,15
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      3e880fb5
    • N
      vfs: revert per-cpu nr_unused counters for dentry and inodes · 86c8749e
      Nick Piggin 提交于
      The nr_unused counters count the number of objects on an LRU, and as such they
      are synchronized with LRU object insertion and removal and scanning, and
      protected under the LRU lock.
      
      Making it per-cpu does not actually get any concurrency improvements because of
      this lock, and summing the counter is much slower, and
      incrementing/decrementing it costs more code size and is slower too.
      
      These counters should stay per-LRU, which currently means global.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      86c8749e
    • N
      kernel: kmem_ptr_validate considered harmful · ccd35fb9
      Nick Piggin 提交于
      This is a nasty and error prone API. It is no longer used, remove it.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      ccd35fb9
    • N
      fs: d_validate fixes · 786a5e15
      Nick Piggin 提交于
      d_validate has been broken for a long time.
      
      kmem_ptr_validate does not guarantee that a pointer can be dereferenced
      if it can go away at any time. Even rcu_read_lock doesn't help, because
      the pointer might be queued in RCU callbacks but not executed yet.
      
      So the parent cannot be checked, nor the name hashed. The dentry pointer
      can not be touched until it can be verified under lock. Hashing simply
      cannot be used.
      
      Instead, verify the parent/child relationship by traversing parent's
      d_child list. It's slow, but only ncpfs and the destaged smbfs care
      about it, at this point.
      Signed-off-by: NNick Piggin <npiggin@kernel.dk>
      786a5e15
  2. 05 1月, 2011 5 次提交
  3. 04 1月, 2011 12 次提交
    • L
      Merge master.kernel.org:/home/rmk/linux-2.6-arm · 989d873f
      Linus Torvalds 提交于
      * master.kernel.org:/home/rmk/linux-2.6-arm:
        ARM: pxa: fix page table corruption on resume
        ARM: it8152: add IT8152_LAST_IRQ definition to fix build error
        ARM: pxa: PXA_ESERIES depends on FB_W100.
        ARM: 6605/1: Add missing include "asm/memory.h"
        ARM: 6540/1: Stop irqsoff trace on return to user
        ARM: 6537/1: update Nomadik, U300 and Ux500 maintainers
        ARM: 6536/1: Add missing SZ_{32,64,128}
        ARM: fix cache-feroceon-l2 after stack based kmap_atomic()
        ARM: fix cache-xsc3l2 after stack based kmap_atomic()
        ARM: get rid of kmap_high_l1_vipt()
        ARM: smp: avoid incrementing mm_users on CPU startup
        ARM: pxa: PXA_ESERIES depends on FB_W100.
      989d873f
    • A
      arch/mn10300/kernel/irq.c: fix build · d9a1abe4
      Andrew Morton 提交于
      Addresses https://bugzilla.kernel.org/show_bug.cgi?id=25702Reported-by: NMartin Ettl <ettl.martin@gmx.de>
      Cc: David Howells <dhowells@redhat.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      d9a1abe4
    • M
      ima: fix add LSM rule bug · 867c2026
      Mimi Zohar 提交于
      If security_filter_rule_init() doesn't return a rule, then not everything
      is as fine as the return code implies.
      
      This bug only occurs when the LSM (eg. SELinux) is disabled at runtime.
      
      Adding an empty LSM rule causes ima_match_rules() to always succeed,
      ignoring any remaining rules.
      
       default IMA TCB policy:
        # PROC_SUPER_MAGIC
        dont_measure fsmagic=0x9fa0
        # SYSFS_MAGIC
        dont_measure fsmagic=0x62656572
        # DEBUGFS_MAGIC
        dont_measure fsmagic=0x64626720
        # TMPFS_MAGIC
        dont_measure fsmagic=0x01021994
        # SECURITYFS_MAGIC
        dont_measure fsmagic=0x73636673
      
        < LSM specific rule >
        dont_measure obj_type=var_log_t
      
        measure func=BPRM_CHECK
        measure func=FILE_MMAP mask=MAY_EXEC
        measure func=FILE_CHECK mask=MAY_READ uid=0
      
      Thus without the patch, with the boot parameters 'tcb selinux=0', adding
      the above 'dont_measure obj_type=var_log_t' rule to the default IMA TCB
      measurement policy, would result in nothing being measured.  The patch
      prevents the default TCB policy from being replaced.
      Signed-off-by: NMimi Zohar <zohar@us.ibm.com>
      Cc: James Morris <jmorris@namei.org>
      Acked-by: NSerge Hallyn <serge.hallyn@canonical.com>
      Cc: David Safford <safford@watson.ibm.com>
      Cc: <stable@kernel.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      867c2026
    • R
    • F
      bridge: stp: ensure mac header is set · e6f26129
      Florian Westphal 提交于
      commit bf9ae538
      (llc: use dev_hard_header) removed the
      skb_reset_mac_header call from llc_mac_hdr_init.
      
      This seems fine itself, but br_send_bpdu() invokes ebtables LOCAL_OUT.
      
      We oops in ebt_basic_match() because it assumes eth_hdr(skb) returns
      a meaningful result.
      
      Cc: acme@ghostprotocols.net
      References: https://bugzilla.kernel.org/show_bug.cgi?id=24532Signed-off-by: NFlorian Westphal <fw@strlen.de>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      e6f26129
    • L
      Merge branch 'perf-fixes-for-linus' of... · 03ed6a3a
      Linus Torvalds 提交于
      Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
      
      * 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
        perf: Fix callchain hit bad cast on ascii display
        arch/x86/oprofile/op_model_amd.c: Perform initialisation on a single CPU
        watchdog: Improve initialisation error message and documentation
      03ed6a3a
    • L
      Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 · 4c37a4b5
      Linus Torvalds 提交于
      * 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6:
        [media] em28xx: radio_fops should also use unlocked_ioctl
        [media] wm8775: Revert changeset fcb97573 to avoid a regression
        [media] cx25840: Prevent device probe failure due to volume control ERANGE error
      4c37a4b5
    • L
      Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx · d45fa563
      Linus Torvalds 提交于
      * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx:
        dmaengine: provide dummy functions for DMA_ENGINE=n
        mv_xor: fix race in tasklet function
      d45fa563
    • J
      name_to_dev_t() must not call __init code · a1cf11d8
      Jan Beulich 提交于
      The function can't be __init itself (being called from some sysfs
      handler), and hence none of the functions it calls can be either.
      Signed-off-by: NJan Beulich <jbeulich@novell.com>
      Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      a1cf11d8
    • T
      bridge: fix br_multicast_ipv6_rcv for paged skbs · 9d89081d
      Tomas Winkler 提交于
      use pskb_may_pull to access ipv6 header correctly for paged skbs
      It was omitted in the bridge code leading to crash in blind
      __skb_pull
      
      since the skb is cloned undonditionally we also simplify the
      the exit path
      
      this fixes bug https://bugzilla.kernel.org/show_bug.cgi?id=25202
      
      Dec 15 14:36:40 User-PC hostapd: wlan0: STA 00:15:00:60:5d:34 IEEE 802.11: authenticated
      Dec 15 14:36:40 User-PC hostapd: wlan0: STA 00:15:00:60:5d:34 IEEE 802.11: associated (aid 2)
      Dec 15 14:36:40 User-PC hostapd: wlan0: STA 00:15:00:60:5d:34 RADIUS: starting accounting session 4D0608A3-00000005
      Dec 15 14:36:41 User-PC kernel: [175576.120287] ------------[ cut here ]------------
      Dec 15 14:36:41 User-PC kernel: [175576.120452] kernel BUG at include/linux/skbuff.h:1178!
      Dec 15 14:36:41 User-PC kernel: [175576.120609] invalid opcode: 0000 [#1] SMP
      Dec 15 14:36:41 User-PC kernel: [175576.120749] last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/uevent
      Dec 15 14:36:41 User-PC kernel: [175576.121035] Modules linked in: approvals binfmt_misc bridge stp llc parport_pc ppdev arc4 iwlagn snd_hda_codec_realtek iwlcore i915 snd_hda_intel mac80211 joydev snd_hda_codec snd_hwdep snd_pcm snd_seq_midi drm_kms_helper snd_rawmidi drm snd_seq_midi_event snd_seq snd_timer snd_seq_device cfg80211 eeepc_wmi usbhid psmouse intel_agp i2c_algo_bit intel_gtt uvcvideo agpgart videodev sparse_keymap snd shpchp v4l1_compat lp hid video serio_raw soundcore output snd_page_alloc ahci libahci atl1c
      Dec 15 14:36:41 User-PC kernel: [175576.122712]
      Dec 15 14:36:41 User-PC kernel: [175576.122769] Pid: 0, comm: kworker/0:0 Tainted: G        W   2.6.37-rc5-wl+ #3 1015PE/1016P
      Dec 15 14:36:41 User-PC kernel: [175576.123012] EIP: 0060:[<f83edd65>] EFLAGS: 00010283 CPU: 1
      Dec 15 14:36:41 User-PC kernel: [175576.123193] EIP is at br_multicast_rcv+0xc95/0xe1c [bridge]
      Dec 15 14:36:41 User-PC kernel: [175576.123362] EAX: 0000001c EBX: f5626318 ECX: 00000000 EDX: 00000000
      Dec 15 14:36:41 User-PC kernel: [175576.123550] ESI: ec512262 EDI: f5626180 EBP: f60b5ca0 ESP: f60b5bd8
      Dec 15 14:36:41 User-PC kernel: [175576.123737]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
      Dec 15 14:36:41 User-PC kernel: [175576.123902] Process kworker/0:0 (pid: 0, ti=f60b4000 task=f60a8000 task.ti=f60b0000)
      Dec 15 14:36:41 User-PC kernel: [175576.124137] Stack:
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  ec556500 f6d06800 f60b5be8 c01087d8 ec512262 00000030 00000024 f5626180
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  f572c200 ef463440 f5626300 3affffff f6d06dd0 e60766a4 000000c4 f6d06860
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  ffffffff ec55652c 00000001 f6d06844 f60b5c64 c0138264 c016e451 c013e47d
      Dec 15 14:36:41 User-PC kernel: [175576.124181] Call Trace:
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c01087d8>] ? sched_clock+0x8/0x10
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c0138264>] ? enqueue_entity+0x174/0x440
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c016e451>] ? sched_clock_cpu+0x131/0x190
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c013e47d>] ? select_task_rq_fair+0x2ad/0x730
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c0524fc1>] ? nf_iterate+0x71/0x90
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f83e4914>] ? br_handle_frame_finish+0x184/0x220 [bridge]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f83e4790>] ? br_handle_frame_finish+0x0/0x220 [bridge]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f83e46e9>] ? br_handle_frame+0x189/0x230 [bridge]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f83e4790>] ? br_handle_frame_finish+0x0/0x220 [bridge]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f83e4560>] ? br_handle_frame+0x0/0x230 [bridge]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c04ff026>] ? __netif_receive_skb+0x1b6/0x5b0
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c04f7a30>] ? skb_copy_bits+0x110/0x210
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c0503a7f>] ? netif_receive_skb+0x6f/0x80
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f82cb74c>] ? ieee80211_deliver_skb+0x8c/0x1a0 [mac80211]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f82cc836>] ? ieee80211_rx_handlers+0xeb6/0x1aa0 [mac80211]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c04ff1f0>] ? __netif_receive_skb+0x380/0x5b0
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c016e242>] ? sched_clock_local+0xb2/0x190
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c012b688>] ? default_spin_lock_flags+0x8/0x10
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c05d83df>] ? _raw_spin_lock_irqsave+0x2f/0x50
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f82cd621>] ? ieee80211_prepare_and_rx_handle+0x201/0xa90 [mac80211]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f82ce154>] ? ieee80211_rx+0x2a4/0x830 [mac80211]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f815a8d6>] ? iwl_update_stats+0xa6/0x2a0 [iwlcore]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f8499212>] ? iwlagn_rx_reply_rx+0x292/0x3b0 [iwlagn]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c05d83df>] ? _raw_spin_lock_irqsave+0x2f/0x50
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f8483697>] ? iwl_rx_handle+0xe7/0x350 [iwlagn]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<f8486ab7>] ? iwl_irq_tasklet+0xf7/0x5c0 [iwlagn]
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c01aece1>] ? __rcu_process_callbacks+0x201/0x2d0
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c0150d05>] ? tasklet_action+0xc5/0x100
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c0150a07>] ? __do_softirq+0x97/0x1d0
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c05d910c>] ? nmi_stack_correct+0x2f/0x34
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c0150970>] ? __do_softirq+0x0/0x1d0
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  <IRQ>
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c01508f5>] ? irq_exit+0x65/0x70
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c05df062>] ? do_IRQ+0x52/0xc0
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c01036b0>] ? common_interrupt+0x30/0x38
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c03a1fc2>] ? intel_idle+0xc2/0x160
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c04daebb>] ? cpuidle_idle_call+0x6b/0x100
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c0101dea>] ? cpu_idle+0x8a/0xf0
      Dec 15 14:36:41 User-PC kernel: [175576.124181]  [<c05d2702>] ? start_secondary+0x1e8/0x1ee
      
      Cc: David Miller <davem@davemloft.net>
      Cc: Johannes Berg <johannes@sipsolutions.net>
      Cc: Stephen Hemminger <shemminger@vyatta.com>
      Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      9d89081d
    • J
      atl1: fix oops when changing tx/rx ring params · 2f32c867
      J. K. Cliburn 提交于
      Commit 3f5a2a71 zeroes out the statistics
      message block (SMB) and coalescing message block (CMB) when adapter ring
      resources are freed.  This is desirable behavior, but, as a side effect,
      the commit leads to an oops when atl1_set_ringparam() attempts to alter
      the number of rx or tx elements in the ring buffer (by using ethtool
      -G, for example).  We don't want SMB or CMB to change during this
      operation.
      
      Modify atl1_set_ringparam() to preserve SMB and CMB when changing ring
      parameters.
      
      Cc: stable@kernel.org
      Signed-off-by: NJay Cliburn <jcliburn@gmail.com>
      Reported-by: NTõnu Raitviir <jussuf@linux.ee>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      2f32c867
    • I
      Merge branch 'perf/urgent' of... · a0a2b71b
      Ingo Molnar 提交于
      Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into perf/urgent
      a0a2b71b
  4. 03 1月, 2011 14 次提交