Commit Graph

387665 Commits

Author SHA1 Message Date
Pravin B Shelar
f89e57c4f5 vxlan: Fix kernel crash on rmmod.
vxlan exit module unregisters vxlan net and then it unregisters
rtnl ops which triggers vxlan_dellink() from __rtnl_kill_links().
vxlan_dellink() deletes vxlan-dev from vxlan_list which has
list-head in vxlan-net-struct but that is already gone due to
net-unregister. That is how we are getting following crash.

Following commit fixes the crash by fixing module exit path.

BUG: unable to handle kernel paging request at ffff8804102c8000
IP: [<ffffffff812cc5e9>] __list_del_entry+0x29/0xd0
PGD 2972067 PUD 83e019067 PMD 83df97067 PTE 80000004102c8060
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
Modules linked in: ---
CPU: 19 PID: 6712 Comm: rmmod Tainted: GF            3.10.0+ #95
Hardware name: Dell Inc. PowerEdge R620/0KCKR5, BIOS 1.4.8 10/25/2012
task: ffff88080c47c580 ti: ffff88080ac50000 task.ti: ffff88080ac50000
RIP: 0010:[<ffffffff812cc5e9>]  [<ffffffff812cc5e9>]
__list_del_entry+0x29/0xd0
RSP: 0018:ffff88080ac51e08  EFLAGS: 00010206
RAX: ffff8804102c8000 RBX: ffff88040f0d4b10 RCX: dead000000200200
RDX: ffff8804102c8000 RSI: ffff88080ac51e58 RDI: ffff88040f0d4b10
RBP: ffff88080ac51e08 R08: 0000000000000001 R09: 2222222222222222
R10: 2222222222222222 R11: 2222222222222222 R12: ffff88080ac51e58
R13: ffffffffa07b8840 R14: ffffffff81ae48c0 R15: ffff88080ac51e58
FS:  00007f9ef105c700(0000) GS:ffff88082a800000(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8804102c8000 CR3: 00000008227e5000 CR4: 00000000000407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
 ffff88080ac51e28 ffffffff812cc6a1 2222222222222222 ffff88040f0d4000
 ffff88080ac51e48 ffffffffa07b3311 ffff88040f0d4000 ffffffff81ae49c8
 ffff88080ac51e98 ffffffff81492fc2 ffff88080ac51e58 ffff88080ac51e58
Call Trace:
 [<ffffffff812cc6a1>] list_del+0x11/0x40
 [<ffffffffa07b3311>] vxlan_dellink+0x51/0x70 [vxlan]
 [<ffffffff81492fc2>] __rtnl_link_unregister+0xa2/0xb0
 [<ffffffff8149448e>] rtnl_link_unregister+0x1e/0x30
 [<ffffffffa07b7b7c>] vxlan_cleanup_module+0x1c/0x2f [vxlan]
 [<ffffffff810c9b31>] SyS_delete_module+0x1d1/0x2c0
 [<ffffffff812b8a0e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
 [<ffffffff81582f42>] system_call_fastpath+0x16/0x1b
Code: eb 9f 55 48 8b 17 48 b9 00 01 10 00 00 00 ad de 48 8b 47 08 48 89
e5 48 39 ca 74 29 48 b9 00 02 20 00 00 00 ad de 48 39 c8 74 7a <4c> 8b
00 4c 39 c7 75 53 4c 8b 42 08 4c 39 c7 75 2b 48 89 42 08
RIP  [<ffffffff812cc5e9>] __list_del_entry+0x29/0xd0
 RSP <ffff88080ac51e08>
CR2: ffff8804102c8000

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-11 11:45:36 -07:00
Sasha Levin
110ecd69a9 9p: fix off by one causing access violations and memory corruption
p9_release_pages() would attempt to dereference one value past the end of
pages[]. This would cause the following crashes:

[ 6293.171817] BUG: unable to handle kernel paging request at ffff8807c96f3000
[ 6293.174146] IP: [<ffffffff8412793b>] p9_release_pages+0x3b/0x60
[ 6293.176447] PGD 79c5067 PUD 82c1e3067 PMD 82c197067 PTE 80000007c96f3060
[ 6293.180060] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 6293.180060] Modules linked in:
[ 6293.180060] CPU: 62 PID: 174043 Comm: modprobe Tainted: G        W    3.10.0-next-20130710-sasha #3954
[ 6293.180060] task: ffff8807b803b000 ti: ffff880787dde000 task.ti: ffff880787dde000
[ 6293.180060] RIP: 0010:[<ffffffff8412793b>]  [<ffffffff8412793b>] p9_release_pages+0x3b/0x60
[ 6293.214316] RSP: 0000:ffff880787ddfc28  EFLAGS: 00010202
[ 6293.214316] RAX: 0000000000000001 RBX: ffff8807c96f2ff8 RCX: 0000000000000000
[ 6293.222017] RDX: ffff8807b803b000 RSI: 0000000000000001 RDI: ffffea001c7e3d40
[ 6293.222017] RBP: ffff880787ddfc48 R08: 0000000000000000 R09: 0000000000000000
[ 6293.222017] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
[ 6293.222017] R13: 0000000000000001 R14: ffff8807cc50c070 R15: ffff8807cc50c070
[ 6293.222017] FS:  00007f572641d700(0000) GS:ffff8807f3600000(0000) knlGS:0000000000000000
[ 6293.256784] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 6293.256784] CR2: ffff8807c96f3000 CR3: 00000007c8e81000 CR4: 00000000000006e0
[ 6293.256784] Stack:
[ 6293.256784]  ffff880787ddfcc8 ffff880787ddfcc8 0000000000000000 ffff880787ddfcc8
[ 6293.256784]  ffff880787ddfd48 ffffffff84128be8 ffff880700000002 0000000000000001
[ 6293.256784]  ffff8807b803b000 ffff880787ddfce0 0000100000000000 0000000000000000
[ 6293.256784] Call Trace:
[ 6293.256784]  [<ffffffff84128be8>] p9_virtio_zc_request+0x598/0x630
[ 6293.256784]  [<ffffffff8115c610>] ? wake_up_bit+0x40/0x40
[ 6293.256784]  [<ffffffff841209b1>] p9_client_zc_rpc+0x111/0x3a0
[ 6293.256784]  [<ffffffff81174b78>] ? sched_clock_cpu+0x108/0x120
[ 6293.256784]  [<ffffffff84122a21>] p9_client_read+0xe1/0x2c0
[ 6293.256784]  [<ffffffff81708a90>] v9fs_file_read+0x90/0xc0
[ 6293.256784]  [<ffffffff812bd073>] vfs_read+0xc3/0x130
[ 6293.256784]  [<ffffffff811a78bd>] ? trace_hardirqs_on+0xd/0x10
[ 6293.256784]  [<ffffffff812bd5a2>] SyS_read+0x62/0xa0
[ 6293.256784]  [<ffffffff841a1a00>] tracesys+0xdd/0xe2
[ 6293.256784] Code: 66 90 48 89 fb 41 89 f5 48 8b 3f 48 85 ff 74 29 85 f6 74 25 45 31 e4 66 0f 1f 84 00 00 00 00 00 e8 eb 14 12 fd 41 ff c4 49 63 c4 <48> 8b 3c c3 48 85 ff 74 05 45 39 e5 75 e7 48 83 c4 08 5b 41 5c
[ 6293.256784] RIP  [<ffffffff8412793b>] p9_release_pages+0x3b/0x60
[ 6293.256784]  RSP <ffff880787ddfc28>
[ 6293.256784] CR2: ffff8807c96f3000
[ 6293.256784] ---[ end trace 50822ee72cd360fc ]---

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-11 11:36:02 -07:00
Linus Torvalds
19d2f8e0fb Second round of 9p patches for the 3.11 merge window.
Several of these patches were rebased in order to correct style issues.
 Only stylistic changes were made versus the patches which were in linux-next
 for two weeks.  The rebases have been in linux-next for 3 days and have
 passed my regressions.
 
 The bulk of these are RDMA fixes and improvements.  There's also some
 additions on the extended attributes front to support some additional
 namespaces and a new option for TCP to force allocation of mount requests
 from a priviledged port.
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Merge tag 'for-linus-3.11-merge-window-part-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

Pull second round of 9p patches from Eric Van Hensbergen:
 "Several of these patches were rebased in order to correct style
  issues.  Only stylistic changes were made versus the patches which
  were in linux-next for two weeks.  The rebases have been in linux-next
  for 3 days and have passed my regressions.

  The bulk of these are RDMA fixes and improvements.  There's also some
  additions on the extended attributes front to support some additional
  namespaces and a new option for TCP to force allocation of mount
  requests from a priviledged port"

* tag 'for-linus-3.11-merge-window-part-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  fs/9p: Remove the unused variable "err" in v9fs_vfs_getattr()
  9P: Add cancelled() to the transport functions.
  9P/RDMA: count posted buffers without a pending request
  9P/RDMA: Improve error handling in rdma_request
  9P/RDMA: Do not free req->rc in error handling in rdma_request()
  9P/RDMA: Use a semaphore to protect the RQ
  9P/RDMA: Protect against duplicate replies
  9P/RDMA: increase P9_RDMA_MAXSIZE to 1MB
  9pnet: refactor struct p9_fcall alloc code
  9P/RDMA: rdma_request() needs not allocate req->rc
  9P: Fix fcall allocation for rdma
  fs/9p: xattr: add trusted and security namespaces
  net/9p: add privport option to 9p tcp transport
2013-07-11 10:21:23 -07:00
Linus Torvalds
746919d266 Code cleanups and improved buffer handling during page crypto operations
- Remove redundant code by merging some encrypt and decrypt functions
 - Get rid of a helper page allocation during page decryption by using in-place
   decryption
 - Better use of entire pages during page crypto operations
 - Several code cleanups
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Merge tag 'ecryptfs-3.11-rc1-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull eCryptfs updates from Tyler Hicks:
 "Code cleanups and improved buffer handling during page crypto
  operations:
   - Remove redundant code by merging some encrypt and decrypt functions
   - Get rid of a helper page allocation during page decryption by using
     in-place decryption
   - Better use of entire pages during page crypto operations
   - Several code cleanups"

* tag 'ecryptfs-3.11-rc1-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  Use ecryptfs_dentry_to_lower_path in a couple of places
  eCryptfs: Make extent and scatterlist crypt function parameters similar
  eCryptfs: Collapse crypt_page_offset() into crypt_extent()
  eCryptfs: Merge ecryptfs_encrypt_extent() and ecryptfs_decrypt_extent()
  eCryptfs: Combine page_offset crypto functions
  eCryptfs: Combine encrypt_scatterlist() and decrypt_scatterlist()
  eCryptfs: Decrypt pages in-place
  eCryptfs: Accept one offset parameter in page offset crypto functions
  eCryptfs: Simplify lower file offset calculation
  eCryptfs: Read/write entire page during page IO
  eCryptfs: Use entire helper page during page crypto operations
  eCryptfs: Cocci spatch "memdup.spatch"
2013-07-11 10:20:18 -07:00
Linus Torvalds
9db019278c A couple cleanups to JFS for 3.11
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Merge tag 'jfs-3.11' of git://github.com/kleikamp/linux-shaggy

Pull jfs update from Dave Kleikamp:
 "A couple cleanups to JFS for 3.11"

* tag 'jfs-3.11' of git://github.com/kleikamp/linux-shaggy:
  jfs: Update jfs_error
  jfs: fix sparse warning in fs/jfs/xattr.c
2013-07-11 10:19:34 -07:00
Linus Torvalds
0ff08ba5d0 Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
Pull nfsd changes from Bruce Fields:
 "Changes this time include:

   - 4.1 enabled on the server by default: the last 4.1-specific issues
     I know of are fixed, so we're not going to find the rest of the
     bugs without more exposure.
   - Experimental support for NFSv4.2 MAC Labeling (to allow running
     selinux over NFS), from Dave Quigley.
   - Fixes for some delicate cache/upcall races that could cause rare
     server hangs; thanks to Neil Brown and Bodo Stroesser for extreme
     debugging persistence.
   - Fixes for some bugs found at the recent NFS bakeathon, mostly v4
     and v4.1-specific, but also a generic bug handling fragmented rpc
     calls"

* 'for-3.11' of git://linux-nfs.org/~bfields/linux: (31 commits)
  nfsd4: support minorversion 1 by default
  nfsd4: allow destroy_session over destroyed session
  svcrpc: fix failures to handle -1 uid's
  sunrpc: Don't schedule an upcall on a replaced cache entry.
  net/sunrpc: xpt_auth_cache should be ignored when expired.
  sunrpc/cache: ensure items removed from cache do not have pending upcalls.
  sunrpc/cache: use cache_fresh_unlocked consistently and correctly.
  sunrpc/cache: remove races with queuing an upcall.
  nfsd4: return delegation immediately if lease fails
  nfsd4: do not throw away 4.1 lock state on last unlock
  nfsd4: delegation-based open reclaims should bypass permissions
  svcrpc: don't error out on small tcp fragment
  svcrpc: fix handling of too-short rpc's
  nfsd4: minor read_buf cleanup
  nfsd4: fix decoding of compounds across page boundaries
  nfsd4: clean up nfs4_open_delegation
  NFSD: Don't give out read delegations on creates
  nfsd4: allow client to send no cb_sec flavors
  nfsd4: fail attempts to request gss on the backchannel
  nfsd4: implement minimal SP4_MACH_CRED
  ...
2013-07-11 10:17:13 -07:00
Linus Torvalds
c72bb31691 The majority of the changes here are cleanups for the large changes that
were added to 3.10, which includes several bug fixes that have been
 marked for stable.
 
 As for new features, there were a few, but nothing to write to LWN about.
 These include:
 
 New function trigger called "dump" and "cpudump" that will cause
 ftrace to dump its buffer to the console when the function is called.
 The difference between "dump" and "cpudump" is that "dump" will dump
 the entire contents of the ftrace buffer, where as "cpudump" will only
 dump the contents of the ftrace buffer for the CPU that called the function.
 
 Another small enhancement is a new sysctl switch called "traceoff_on_warning"
 which, when enabled, will disable tracing if any WARN_ON() is triggered.
 This is useful if you want to debug what caused a warning and do not
 want to risk losing your trace data by the ring buffer overwriting the
 data before you can disable it. There's also a kernel command line
 option that will make this enabled at boot up called the same thing.
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Merge tag 'trace-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing changes from Steven Rostedt:
 "The majority of the changes here are cleanups for the large changes
  that were added to 3.10, which includes several bug fixes that have
  been marked for stable.

  As for new features, there were a few, but nothing to write to LWN
  about.  These include:

  New function trigger called "dump" and "cpudump" that will cause
  ftrace to dump its buffer to the console when the function is called.
  The difference between "dump" and "cpudump" is that "dump" will dump
  the entire contents of the ftrace buffer, where as "cpudump" will only
  dump the contents of the ftrace buffer for the CPU that called the
  function.

  Another small enhancement is a new sysctl switch called
  "traceoff_on_warning" which, when enabled, will disable tracing if any
  WARN_ON() is triggered.  This is useful if you want to debug what
  caused a warning and do not want to risk losing your trace data by the
  ring buffer overwriting the data before you can disable it.  There's
  also a kernel command line option that will make this enabled at boot
  up called the same thing"

* tag 'trace-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (34 commits)
  tracing: Make tracing_open_generic_{tr,tc}() static
  tracing: Remove ftrace() function
  tracing: Remove TRACE_EVENT_TYPE enum definition
  tracing: Make tracer_tracing_{off,on,is_on}() static
  tracing: Fix irqs-off tag display in syscall tracing
  uprobes: Fix return value in error handling path
  tracing: Fix race between deleting buffer and setting events
  tracing: Add trace_array_get/put() to event handling
  tracing: Get trace_array ref counts when accessing trace files
  tracing: Add trace_array_get/put() to handle instance refs better
  tracing: Protect ftrace_trace_arrays list in trace_events.c
  tracing: Make trace_marker use the correct per-instance buffer
  ftrace: Do not run selftest if command line parameter is set
  tracing/kprobes: Don't pass addr=ip to perf_trace_buf_submit()
  tracing: Use flag buffer_disabled for irqsoff tracer
  tracing/kprobes: Turn trace_probe->files into list_head
  tracing: Fix disabling of soft disable
  tracing: Add missing syscall_metadata comment
  tracing: Simplify code for showing of soft disabled flag
  tracing/kprobes: Kill probe_enable_lock
  ...
2013-07-11 09:02:09 -07:00
Chandra Seetharaman
92f8ff73f1 xfs: Add pquota fields where gquota is used.
Add project quota changes to all the places where group quota field
is used:
   * add separate project quota members into various structures
   * split project quota and group quotas so that instead of overriding
     the group quota members incore, the new project quota members are
     used instead
   * get rid of usage of the OQUOTA flag incore, in favor of separate
     group and project quota flags.
   * add a project dquot argument to various functions.

Not using the pquotino field from superblock yet.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2013-07-11 10:35:32 -05:00
Geert Uytterhoeven
b41e6a51d5 sh_eth: SH_ETH should depend on HAS_DMA
If NO_DMA=y:

drivers/built-in.o: In function `sh_eth_free_dma_buffer':
drivers/net/ethernet/renesas/sh_eth.c:1103: undefined reference to `dma_free_coherent'
drivers/net/ethernet/renesas/sh_eth.c:1110: undefined reference to `dma_free_coherent'
drivers/built-in.o: In function `sh_eth_ring_init':
drivers/net/ethernet/renesas/sh_eth.c:1065: undefined reference to `dma_alloc_coherent'
drivers/net/ethernet/renesas/sh_eth.c:1086: undefined reference to `dma_free_coherent'
drivers/built-in.o: In function `sh_eth_ring_format':
drivers/net/ethernet/renesas/sh_eth.c:988: undefined reference to `dma_map_single'
drivers/built-in.o: In function `sh_eth_txfree':
drivers/net/ethernet/renesas/sh_eth.c:1220: undefined reference to `dma_unmap_single'
drivers/built-in.o: In function `sh_eth_rx':
drivers/net/ethernet/renesas/sh_eth.c:1323: undefined reference to `dma_map_single'
drivers/built-in.o: In function `sh_eth_start_xmit':
drivers/net/ethernet/renesas/sh_eth.c:1954: undefined reference to `dma_map_single'

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 19:47:14 -07:00
Hannes Frederic Sowa
1eb4f75828 ipv6: in case of link failure remove route directly instead of letting it expire
We could end up expiring a route which is part of an ecmp route set. Doing
so would invalidate the rt->rt6i_nsiblings calculations and could provoke
the following panic:

[   80.144667] ------------[ cut here ]------------
[   80.145172] kernel BUG at net/ipv6/ip6_fib.c:733!
[   80.145172] invalid opcode: 0000 [#1] SMP
[   80.145172] Modules linked in: 8021q nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_filter ebtables ip6table_filter ip6_tables
+snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_page_alloc snd_timer virtio_balloon snd soundcore i2c_piix4 i2c_core virtio_net virtio_blk
[   80.145172] CPU: 1 PID: 786 Comm: ping6 Not tainted 3.10.0+ #118
[   80.145172] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   80.145172] task: ffff880117fa0000 ti: ffff880118770000 task.ti: ffff880118770000
[   80.145172] RIP: 0010:[<ffffffff815f3b5d>]  [<ffffffff815f3b5d>] fib6_add+0x75d/0x830
[   80.145172] RSP: 0018:ffff880118771798  EFLAGS: 00010202
[   80.145172] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88011350e480
[   80.145172] RDX: ffff88011350e238 RSI: 0000000000000004 RDI: ffff88011350f738
[   80.145172] RBP: ffff880118771848 R08: ffff880117903280 R09: 0000000000000001
[   80.145172] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011350f680
[   80.145172] R13: ffff880117903280 R14: ffff880118771890 R15: ffff88011350ef90
[   80.145172] FS:  00007f02b5127740(0000) GS:ffff88011fd00000(0000) knlGS:0000000000000000
[   80.145172] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   80.145172] CR2: 00007f981322a000 CR3: 00000001181b1000 CR4: 00000000000006e0
[   80.145172] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   80.145172] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   80.145172] Stack:
[   80.145172]  0000000000000001 ffff880100000000 ffff880100000000 ffff880117903280
[   80.145172]  0000000000000000 ffff880119a4cf00 0000000000000400 00000000000007fa
[   80.145172]  0000000000000000 0000000000000000 0000000000000000 ffff88011350f680
[   80.145172] Call Trace:
[   80.145172]  [<ffffffff815eeceb>] ? rt6_bind_peer+0x4b/0x90
[   80.145172]  [<ffffffff815ed985>] __ip6_ins_rt+0x45/0x70
[   80.145172]  [<ffffffff815eee35>] ip6_ins_rt+0x35/0x40
[   80.145172]  [<ffffffff815ef1e4>] ip6_pol_route.isra.44+0x3a4/0x4b0
[   80.145172]  [<ffffffff815ef34a>] ip6_pol_route_output+0x2a/0x30
[   80.145172]  [<ffffffff81616077>] fib6_rule_action+0xd7/0x210
[   80.145172]  [<ffffffff815ef320>] ? ip6_pol_route_input+0x30/0x30
[   80.145172]  [<ffffffff81553026>] fib_rules_lookup+0xc6/0x140
[   80.145172]  [<ffffffff81616374>] fib6_rule_lookup+0x44/0x80
[   80.145172]  [<ffffffff815ef320>] ? ip6_pol_route_input+0x30/0x30
[   80.145172]  [<ffffffff815edea3>] ip6_route_output+0x73/0xb0
[   80.145172]  [<ffffffff815dfdf3>] ip6_dst_lookup_tail+0x2c3/0x2e0
[   80.145172]  [<ffffffff813007b1>] ? list_del+0x11/0x40
[   80.145172]  [<ffffffff81082a4c>] ? remove_wait_queue+0x3c/0x50
[   80.145172]  [<ffffffff815dfe4d>] ip6_dst_lookup_flow+0x3d/0xa0
[   80.145172]  [<ffffffff815fda77>] rawv6_sendmsg+0x267/0xc20
[   80.145172]  [<ffffffff815a8a83>] inet_sendmsg+0x63/0xb0
[   80.145172]  [<ffffffff8128eb93>] ? selinux_socket_sendmsg+0x23/0x30
[   80.145172]  [<ffffffff815218d6>] sock_sendmsg+0xa6/0xd0
[   80.145172]  [<ffffffff81524a68>] SYSC_sendto+0x128/0x180
[   80.145172]  [<ffffffff8109825c>] ? update_curr+0xec/0x170
[   80.145172]  [<ffffffff81041d09>] ? kvm_clock_get_cycles+0x9/0x10
[   80.145172]  [<ffffffff810afd1e>] ? __getnstimeofday+0x3e/0xd0
[   80.145172]  [<ffffffff8152509e>] SyS_sendto+0xe/0x10
[   80.145172]  [<ffffffff8164efd9>] system_call_fastpath+0x16/0x1b
[   80.145172] Code: fe ff ff 41 f6 45 2a 06 0f 85 ca fe ff ff 49 8b 7e 08 4c 89 ee e8 94 ef ff ff e9 b9 fe ff ff 48 8b 82 28 05 00 00 e9 01 ff ff ff <0f> 0b 49 8b 54 24 30 0d 00 00 40 00 89 83 14 01 00 00 48 89 53
[   80.145172] RIP  [<ffffffff815f3b5d>] fib6_add+0x75d/0x830
[   80.145172]  RSP <ffff880118771798>
[   80.387413] ---[ end trace 02f20b7a8b81ed95 ]---
[   80.390154] Kernel panic - not syncing: Fatal exception in interrupt

Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 19:45:39 -07:00
Linus Torvalds
6d128e1e72 Revert "Makefile: Fix install error with make -j option"
This reverts commit d2aae8477c.

It is completely and utterly broken.  Module install should not build
any files, and adding broken dependencies to "help" it build files is
complete and utter sh*t.

The kernel should not be built by root, and "make install" and "make
module_install" (that for obvious reasons need to be run as root)
absolutely must not build any files.  They should only ever copy the
already-built files over.

So having dependencies for the install targets is wrong, wrong, wrong.

If you try to install a kernel without building it first, you *should*
get errors. The build system shouldn't try to help root build the files.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-10 19:02:51 -07:00
Jason Wang
61d46bf979 macvtap: correctly linearize skb when zerocopy is used
Userspace may produce vectors greater than MAX_SKB_FRAGS. When we try to
linearize parts of the skb to let the rest of iov to be fit in
the frags, we need count copylen into linear when calling macvtap_alloc_skb()
instead of partly counting it into data_len. Since this breaks
zerocopy_sg_from_iovec() since its inner counter assumes nr_frags should
be zero at beginning. This cause nr_frags to be increased wrongly without
setting the correct frags.

This bug were introduced from b92946e291
(macvtap: zerocopy: validate vectors before building skb).

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 18:45:52 -07:00
Jason Wang
3dd5c3308e tuntap: correctly linearize skb when zerocopy is used
Userspace may produce vectors greater than MAX_SKB_FRAGS. When we try to
linearize parts of the skb to let the rest of iov to be fit in
the frags, we need count copylen into linear when calling tun_alloc_skb()
instead of partly counting it into data_len. Since this breaks
zerocopy_sg_from_iovec() since its inner counter assumes nr_frags should
be zero at beginning. This cause nr_frags to be increased wrongly without
setting the correct frags.

This bug were introduced from 0690899b4d
(tun: experimental zero copy tx support)

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 18:45:52 -07:00
dingtianhong
440d57bc5f ifb: fix rcu_sched self-detected stalls
According to the commit 16b0dc29c1
(dummy: fix rcu_sched self-detected stalls)

Eric Dumazet fix the problem in dummy, but the ifb will occur the
same problem like the dummy modules.

Trying to "modprobe ifb numifbs=30000" triggers :

INFO: rcu_sched self-detected stall on CPU

After this splat, RTNL is locked and reboot is needed.

We must call cond_resched() to avoid this, even holding RTNL.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 18:44:03 -07:00
Linus Torvalds
64fb6d9aa0 Merge tag 'kvm-3.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull more KVM changes from Gleb Natapov:
 "A fix for a bug that prevents some guests from working on old Intel
  CPUs and a patch that integrates ARM64 KVM, merged via ARM64 tree,
  into Kconfig."

* tag 'kvm-3.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: VMX: mark unusable segment as nonpresent
  arm64: KVM: Kconfig integration
2013-07-10 18:17:41 -07:00
Linus Torvalds
b4294eecb2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Pull Sparc bugfixes from David Miller:
 "Four bug fixes:

   1) Enable snoop tags properly on Sparc32/LEON, from Andreas Larsson

   2) strcpy() length check fix from Chen Gang.

   3) Forgotten unregister_netdev() in sunvnet driver, from Dave
      Kleikamp.

   4) Fix broken assembler offsets used in vm_area_struct accesses on
      sparc32, from Olivier DANET."

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  [PATCH] sparc32: vm_area_struct access for old Sun SPARCs.
  sunvnet: vnet_port_remove must call unregister_netdev
  sparc32, leon: Require separate snoop tags set to regard snooping to be enabled
  arch: sparc: kernel: check the memory length before use strcpy().
2013-07-10 18:16:34 -07:00
Linus Torvalds
4ece92df29 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide
Pull IDE updates from David Miller:
 "Just a few small things:

   1) module_platform_driver_probe() conversions from Jingoo Han.

   2) module_pci_driver() conversion from Libo Chen.

   3) PIO size calculation fix from Steven J Hill"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide:
  ide: Fix IDE PIO size calculation
  drivers/ide/delkin_cb: Convert to module_pci_driver
  ide: gayle: use module_platform_driver_probe()
  ide: tx4939ide: use module_platform_driver_probe()
  ide: tx4938ide: use module_platform_driver_probe()
2013-07-10 18:15:41 -07:00
Linus Torvalds
75fcf64dc7 Merge branch 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull printk locking fix from Thomas Gleixner:
 "A single lock ordering fix in the printk code"

* 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  printk: Fix rq->lock vs logbuf_lock unlock lock inversion
2013-07-10 18:14:24 -07:00
Linus Torvalds
db6e330490 Merge branch 'akpm' (patches from Andrew Morton)
Merge more patches from Andrew Morton:
 "The rest of MM"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm: remove free_area_cache
  zswap: add documentation
  zswap: add to mm/
  zbud: add to mm/
2013-07-10 18:11:43 -07:00
Michel Lespinasse
98d1e64f95 mm: remove free_area_cache
Since all architectures have been converted to use vm_unmapped_area(),
there is no remaining use for the free_area_cache.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-10 18:11:34 -07:00
Seth Jennings
61b0d76017 zswap: add documentation
Add the documentation file for the zswap functionality

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Cc: Jenifer Hopper <jhopper@us.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: Joe Perches <joe@perches.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: Hugh Dickens <hughd@google.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-10 18:11:34 -07:00
Seth Jennings
2b2811178e zswap: add to mm/
zswap is a thin backend for frontswap that takes pages that are in the
process of being swapped out and attempts to compress them and store
them in a RAM-based memory pool.  This can result in a significant I/O
reduction on the swap device and, in the case where decompressing from
RAM is faster than reading from the swap device, can also improve
workload performance.

It also has support for evicting swap pages that are currently
compressed in zswap to the swap device on an LRU(ish) basis.  This
functionality makes zswap a true cache in that, once the cache is full,
the oldest pages can be moved out of zswap to the swap device so newer
pages can be compressed and stored in zswap.

This patch adds the zswap driver to mm/

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Cc: Jenifer Hopper <jhopper@us.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: Joe Perches <joe@perches.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: Hugh Dickens <hughd@google.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-10 18:11:34 -07:00
Seth Jennings
4e2e2770b1 zbud: add to mm/
zbud is an special purpose allocator for storing compressed pages.  It
is designed to store up to two compressed pages per physical page.
While this design limits storage density, it has simple and
deterministic reclaim properties that make it preferable to a higher
density approach when reclaim will be used.

zbud works by storing compressed pages, or "zpages", together in pairs
in a single memory page called a "zbud page".  The first buddy is "left
justifed" at the beginning of the zbud page, and the last buddy is
"right justified" at the end of the zbud page.  The benefit is that if
either buddy is freed, the freed buddy space, coalesced with whatever
slack space that existed between the buddies, results in the largest
possible free region within the zbud page.

zbud also provides an attractive lower bound on density.  The ratio of
zpages to zbud pages can not be less than 1.  This ensures that zbud can
never "do harm" by using more pages to store zpages than the
uncompressed zpages would have used on their own.

This implementation is a rewrite of the zbud allocator internally used
by zcache in the driver/staging tree.  The rewrite was necessary to
remove some of the zcache specific elements that were ingrained
throughout and provide a generic allocation interface that can later be
used by zsmalloc and others.

This patch adds zbud to mm/ for later use by zswap.

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Cc: Jenifer Hopper <jhopper@us.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: Joe Perches <joe@perches.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: Hugh Dickens <hughd@google.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-10 18:11:34 -07:00
hayeswang
45dd95c443 r8169: add a new chip for RTL8411
Add a new chip for RTL8411 series.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 17:43:12 -07:00
David S. Miller
0e00fd4794 Merge "net: finish renaming lls to busy poll"
Eliezer Tamir says:

====================
Here are three patches that complete the rename of lls to busy-poll

1. rename include/net/ll_poll.h to include/net/busy_poll.h
2. Rename ndo_ll_poll to ndo_busy_poll.
   Rename sk_mark_ll to sk_mark_napi_id.
   Rename skb_mark_ll to skb_mark_napi_id.
   Correct all useres of these functions.
   Update comments and defines  in include/net/busy_poll.h
3. Rename LL_SO to BUSY_POLL_SO
   Rename sysctl_net_ll_{read,poll} to sysctl_busy_{read,poll}
   Fix up users of these variables.
   Fix documentation for sysctl.

v2 fixed forgetting the ndo changes in v1
v3 is a resend with -M
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 17:10:40 -07:00
Eliezer Tamir
64b0dc517e net: rename busy poll socket op and globals
Rename LL_SO to BUSY_POLL_SO
Rename sysctl_net_ll_{read,poll} to sysctl_busy_{read,poll}
Fix up users of these variables.
Fix documentation for sysctl.

a patch for the socket.7  man page will follow separately,
because of limitations of my mail setup.

Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 17:08:27 -07:00
Eliezer Tamir
8b80cda536 net: rename ll methods to busy-poll
Rename ndo_ll_poll to ndo_busy_poll.
Rename sk_mark_ll to sk_mark_napi_id.
Rename skb_mark_ll to skb_mark_napi_id.
Correct all useres of these functions.
Update comments and defines  in include/net/busy_poll.h

Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 17:08:27 -07:00
Eliezer Tamir
076bb0c82a net: rename include/net/ll_poll.h to include/net/busy_poll.h
Rename the file and correct all the places where it is included.

Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-10 17:08:27 -07:00
Linus Torvalds
ae92494930 Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Pull coccinelle updates from Michal Marek:
 "The misc branch is reserved for Coccinelle this time:

   - 'report' is the default mode
   - MAINTAINERS update for Coccinelle
   - documentation udate
   - use new option format for spatch(1)
   - J=<n> variable to mimic make -j for coccicheck
   - check for missing pci_free_consistent() calls

  There are some patches for rpm-pkg and deb-pkg waiting for the
  3.12-rc1 merge window"

* 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  Coccinelle: Update information about the minimal version required
  Coccinelle: Update the options used to the new option scheme
  scripts: Coccinelle script for pci_free_consistent()
  Coccinelle: Update the documentation
  Coccinelle: Update section of MAINTAINERS
  coccicheck: span checks across CPUs
  scripts/coccinelle: check for field address argument to kfree
  Coccinelle: Update the Coccinelle section of MAINTAINERS
  Coccinelle: Make 'report' the default mode
2013-07-10 16:08:06 -07:00
Linus Torvalds
b202c0d520 Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Pull kconfig updates from Michal Marek:
 - dependency solver fix for make defconfig
 - randconfig fixes, one of which had to be reverted again
 - more user-friendly sorting of search results
 - hex and range keywords support longs
 - fix for [mn]conf not to rely on particular behavior of the LINES and
   COLS variables
 - cleanup of magic constants in kconfig/lxdialog
 - [mn]conf formatting fixes
 - fix for scripts/config's help text in out-of-tree usage (under a
   different name)

* 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  kconfig: allow "hex" and "range" to support longs
  Revert "kconfig: fix randomising choice entries in presence of KCONFIG_ALLCONFIG"
  kconfig: fix randomising choice entries in presence of KCONFIG_ALLCONFIG
  kconfig: loop as long as we changed some symbols in randconfig
  kconfig/[mn]conf: make it explicit in the search box that a regexp is possible
  kconfig: sort found symbols by relevance
  kconfig/conf: print the seed used to initialise the RNG for randconfig
  kconfig/conf: accept a base-16 seed for randconfig
  kconfig/conf: fix randconfig setting multiple symbols in a choice
  scripts/config: replace hard-coded script name by a dynamic value
  mconf/nconf: mark empty menus/menuconfigs different from non-empty ones
  nconf: use function calls instead of ncurses' variables LINES and COLS
  mconf: use function calls instead of ncurses' variables LINES and COLS
  kconfig/lxdialog: handle newline characters in print_autowrap()
  kconfig/lxdialog: Use new mininimum resize definitions in conf_choice()
  kconfig/lxdialog: Add definitions for mininimum (re)size values
  kconfig: Fix defconfig when one choice menu selects options that another choice menu depends on
2013-07-10 16:06:46 -07:00
Linus Torvalds
cb63fc2662 Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Pull kbuild updates from Michal Marek:
 - fix for make headers_install argv explosion with too long path
 - scripts/setlocalversion does not call git update-index needlessly
 - fix for the src.rpm produced by make rpm-pkg.  The new make
   image_name can be useful also for other packaging tools.
 - scripts/mod/devicetable-offsets.o is not rebuilt during each make run
 - make modules_install dependency fix
 - scripts/sortextable portability fix
 - fix for kbuild to generate the output directory for all object files
   in subdirs.
 - a couple of minor fixes

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  kbuild: create directory for dir/file.o
  tools/include: use stdint types for user-space byteshift headers
  Makefile: Fix install error with make -j option
  Fix a build warning in scripts/mod/file2alias.c
  improve modalias building
  scripts/mod: Spelling s/DEVICEVTABLE/DEVICETABLE/
  kbuild: fix error when building from src rpm
  scripts/setlocalversion on write-protected source tree
  Makefile.lib: align DTB quiet_cmd
  kbuild: fix make headers_install when path is too long
2013-07-10 16:05:40 -07:00
Linus Torvalds
a9642fa351 Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar:
 "Two small fixlets"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix interrupt handler timing harness
  perf/x86/amd: Do not print an error when the device is not present
2013-07-10 16:04:38 -07:00
Jim Ramsay
9d0eb0ab43 dm: add switch target
dm-switch is a new target that maps IO to underlying block devices
efficiently when there is a large number of fixed-sized address regions
but there is no simple pattern to allow for a compact mapping
representation such as dm-stripe.

Though we have developed this target for a specific storage device, Dell
EqualLogic, we have made an effort to keep it as general purpose as
possible in the hope that others may benefit.

Originally developed by Jim Ramsay. Simplified by Mikulas Patocka.

Signed-off-by: Jim Ramsay <jim_ramsay@dell.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:19 +01:00
Alasdair G Kergon
8504eed3ac dm: update maintainers
Add Mike Snitzer as an additional device-mapper maintainer.
Recognise uapi dm-*.h include files as device-mapper files.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Yann Droneaud <ydroneaud@opteya.com>
Cc: Mike Snitzer <snitzer@redhat.com>
2013-07-10 23:41:19 +01:00
Mikulas Patocka
2a7faeb176 dm: optimize reorder structure
This reorder actually improves performance by 20% (from 39.1s to 32.8s)
on x86-64 quad core Opteron.

I have no explanation for this, possibly it makes some other entries are
better cache-aligned.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:18 +01:00
Mikulas Patocka
83d5e5b0af dm: optimize use SRCU and RCU
This patch removes "io_lock" and "map_lock" in struct mapped_device and
"holders" in struct dm_table and replaces these mechanisms with
sleepable-rcu.

Previously, the code would call "dm_get_live_table" and "dm_table_put" to
get and release table. Now, the code is changed to call "dm_get_live_table"
and "dm_put_live_table". dm_get_live_table locks sleepable-rcu and
dm_put_live_table unlocks it.

dm_get_live_table_fast/dm_put_live_table_fast can be used instead of
dm_get_live_table/dm_put_live_table. These *_fast functions use
non-sleepable RCU, so the caller must not block between them.

If the code changes active or inactive dm table, it must call
dm_sync_table before destroying the old table.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:18 +01:00
Mikulas Patocka
2480945cd4 dm bufio: submit writes outside lock
This patch changes dm-bufio so that it submits write I/Os outside of the
lock. If the number of submitted buffers is greater than the number of
requests on the target queue, submit_bio blocks. We want to block outside
of the lock to improve latency of other threads that may need the lock.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:18 +01:00
Mikulas Patocka
43aeaa2957 dm cache: fix arm link errors with inline
Use __always_inline to avoid a link failure with gcc 4.6 on ARM.
gcc 4.7 is OK.

It creates a function block_div.part.8, it references __udivdi3 and
__umoddi3 and it is never called. The references to __udivdi3 and
__umoddi3 cause a link failure.

Reported-by: Rob Herring <robherring2@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:17 +01:00
Mikulas Patocka
553d8fe029 dm verity: use __ffs and __fls
This patch changes ffs() to __ffs() and fls() to __fls() which don't add
one to the result.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:17 +01:00
Alasdair G Kergon
75e3a0f55b dm flakey: correct ctr alloc failure mesg
Remove the reference to the "linear" target from the error message
issued when allocation fails in the flakey target.

Cc: Robin Dong <sanbai@taobao.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:17 +01:00
Mikulas Patocka
5d8be84397 dm verity: remove pointless comparison
Remove num < 0 test in verity_ctr because num is unsigned.
(Found by Coverity.)

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:17 +01:00
Mikulas Patocka
220cd058d9 dm: use __GFP_HIGHMEM in __vmalloc
Use __GFP_HIGHMEM in __vmalloc.

Pages allocated with __vmalloc can be allocated in high memory that is not
directly mapped to kernel space, so use __GFP_HIGHMEM just like vmalloc
does. This patch reduces memory pressure slightly because pages can be
allocated in the high zone.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:16 +01:00
Mikulas Patocka
b1bf2de072 dm verity: fix inability to use a few specific devices sizes
Fix a boundary condition that caused failure for certain device sizes.

The problem is reported at
  http://code.google.com/p/cryptsetup/issues/detail?id=160

For certain device sizes the number of hashes at a specific level was
calculated incorrectly.

It happens for example for a device with data and metadata block size 4096
that has 16385 blocks and algorithm sha256.

The user can test if he is affected by this bug by running the
"veritysetup verify" command and also by activating the dm-verity kernel
driver and reading the whole block device. If it passes without an error,
then the user is not affected.

The condition for the bug is:

Split the total number of data blocks (data_block_bits) into bit strings,
each string has hash_per_block_bits bits. hash_per_block_bits is
rounddown(log2(metadata_block_size/hash_digest_size)). Equivalently, you
can say that you convert data_blocks_bits to 2^hash_per_block_bits base.

If there some zero bit string below the most significant bit string and at
least one bit below this zero bit string is set, then the bug happens.

The same bug exists in the userspace veritysetup tool, so you must use
fixed veritysetup too if you want to use devices that are affected by
this boundary condition.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # 3.4+
Cc: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:16 +01:00
Mikulas Patocka
1c0e883e86 dm ioctl: set noio flag to avoid __vmalloc deadlock
Set noio flag while calling __vmalloc() because it doesn't fully respect
gfp flags to avoid a possible deadlock (see commit
502624bdad).

This should be backported to stable kernels 3.8 and newer. The kernel 3.8
doesn't have memalloc_noio_save(), so we should set and restore process
flag PF_MEMALLOC instead.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:15 +01:00
Hannes Reinecke
6c182cd88d dm mpath: fix ioctl deadlock when no paths
When multipath needs to retry an ioctl the reference to the
current live table needs to be dropped. Otherwise a deadlock
occurs when all paths are down:
- dm_blk_ioctl takes a reference to the current table
  and spins in multipath_ioctl().
- A new table is being loaded, but upon resume the process
  hangs in dm_table_destroy() waiting for references to
  drop to zero.

With this patch the reference to the old table is dropped
prior to retry, thereby avoiding the deadlock.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-07-10 23:41:15 +01:00
Linus Torvalds
8133633368 Nothing interesting. Except the most embarrassing bugfix ever. But let's
ignore that.
 
 Cheers,
 Rusty.
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Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull module updates from Rusty Russell:
 "Nothing interesting.  Except the most embarrassing bugfix ever.  But
  let's ignore that"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  module: cleanup call chain.
  module: do percpu allocation after uniqueness check.  No, really!
  modules: don't fail to load on unknown parameters.
  ABI: Clarify when /sys/module/MODULENAME is created
  There is no /sys/parameters
  module: don't modify argument of module_kallsyms_lookup_name()
2013-07-10 14:51:41 -07:00
Linus Torvalds
5f12972171 No real surprises.
Thanks,
 Rusty.
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Merge tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull virtio updates from Rusty Russell:
 "No real surprises"

* tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  MAINTAINERS: add tools/virtio/ under virtio
  tools/virtio: move module license stub to module.h
  virtio: include asm/barrier explicitly
  virtio: VIRTIO_F_ANY_LAYOUT feature
  lguest: fix example launcher compilation for broken glibc headers.
  virtio-net: fix the race between channels setting and refill
  tools/lguest: real barriers.
  tools/lguest: fix missing rmb().
  virtio_balloon: leak_balloon(): only tell host if we got pages deflated
  virtio-pci: fix leaks of msix_affinity_masks
  Fix comment typo "CONFIG_PAE"
2013-07-10 14:50:58 -07:00
Linus Torvalds
15a49b9a90 vfio Updates for v3.11
Largely hugepage support for vfio/type1 iommu and surrounding cleanups and fixes.
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Merge tag 'vfio-v3.11' of git://github.com/awilliam/linux-vfio

Pull vfio updates from Alex Williamson:
 "Largely hugepage support for vfio/type1 iommu and surrounding cleanups
  and fixes"

* tag 'vfio-v3.11' of git://github.com/awilliam/linux-vfio:
  vfio/type1: Fix leak on error path
  vfio: Limit group opens
  vfio/type1: Fix missed frees and zero sized removes
  vfio: fix documentation
  vfio: Provide module option to disable vfio_iommu_type1 hugepage support
  vfio: hugepage support for vfio_iommu_type1
  vfio: Convert type1 iommu to use rbtree
2013-07-10 14:50:08 -07:00
Linus Torvalds
8d10aae274 vhost: fixes and cleanups 3.11
This includes some fixes and cleanups for vhost net and scsi drivers.
 The scsi driver changes will cause a conflict with  Nicholas Bellinger's scsi
 target changes, but the conflicting commit in my tree simply renames some
 variables so it's trivial to resolve.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull vhost fixes and cleanups from Michael S Tsirkin:
 "This includes some fixes and cleanups for vhost net and scsi drivers"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost/test: update test after vhost cleanups
  vhost: Make local function static
  vhost: Make vhost a separate module
  vhost-scsi: Rename struct tcm_vhost_cmd *tv_cmd to *cmd
  vhost-scsi: Rename struct tcm_vhost_tpg *tv_tpg to *tpg
  vhost-scsi: Make func indention more consistent
  vhost-scsi: Rename struct vhost_scsi *s to *vs
  vhost-scsi: Remove unnecessary forward struct vhost_scsi declaration
  vhost: Simplify dev->vqs[i] access
  vhost-net: fix use-after-free in vhost_net_flush
2013-07-10 14:48:50 -07:00
Linus Torvalds
6664565681 IOMMU Updates for Linux 3.11
A few updates this time, most important and exiciting (to me) is:
 
 	* The new ARM SMMU driver. This is a common IOMMU driver that will
 	  hopefully be used in a lot of upcoming ARM chips. So the mess in the
 	  past where every SOC had its own IOMMU will be over.
 
 Besides that:
 
 	* Some important fixes in the IOMMU unmap path. There are fixes in the
 	  common code and also in the AMD IOMMU driver.
 	* Other random fixes
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Merge tag 'iommu-updates-v3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU updates from Joerg Roedel:
 "A few updates this time, most important and exiciting (to me) is:

   - The new ARM SMMU driver.  This is a common IOMMU driver that will
     hopefully be used in a lot of upcoming ARM chips.  So the mess in
     the past where every SOC had its own IOMMU will be over.

  Besides that:

   - Some important fixes in the IOMMU unmap path.  There are fixes in
     the common code and also in the AMD IOMMU driver.
   - Other random fixes"

* tag 'iommu-updates-v3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  MAINTAINERS: add entry for ARM system MMU driver
  iommu/arm: Add support for ARM Ltd. System MMU architecture
  documentation/iommu: Add description of ARM System MMU binding
  iommu: Use %pa and %zx instead of casting
  iommu/amd: Only unmap large pages from the first pte
  iommu: Fix compiler warning on pr_debug
  iommu/amd: Fix memory leak in free_pagetable
  iommu: Split iommu_unmaps
  iommu/{vt-d,amd}: Remove multifunction assumption around grouping
  iommu/omap: fix checkpatch warnings in omap iommu code
  iommu/omap: fix printk formats for dma_addr_t
  iommu/vt-d: DMAR reporting table needs at least one DRHD
  iommu/vt-d: Downgrade the warning if enabling irq remapping fails
2013-07-10 14:46:40 -07:00