1. 05 Jan, 2010 3 commits
    • Frederic Weisbecker's avatar
      reiserfs: Relax lock on xattr removing · 4f3be1b5
      Frederic Weisbecker authored
      When we remove an xattr, we call lookup_and_delete_xattr()
      that takes some private xattr inodes mutexes. But we hold
      the reiserfs lock at this time, which leads to dependency
      inversions.
      
      We can safely call lookup_and_delete_xattr() without the
      reiserfs lock, where xattr inodes lookups only need the
      xattr inodes mutexes.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Christian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      4f3be1b5
    • Frederic Weisbecker's avatar
      reiserfs: Relax the lock before truncating pages · 108d3943
      Frederic Weisbecker authored
      While truncating a file, reiserfs_setattr() calls inode_setattr()
      that will truncate the mapping for the given inode, but for that
      it needs the pages locks.
      
      In order to release these, the owners need the reiserfs lock to
      complete their jobs. But they can't, as we don't release it before
      calling inode_setattr().
      
      We need to do that to fix the following softlockups:
      
      INFO: task flush-8:0:2149 blocked for more than 120 seconds.
      "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
      flush-8:0     D f51af998     0  2149      2 0x00000000
       f51af9ac 00000092 00000002 f51af998 c2803304 00000000 c1894ad0 010f3000
       f51af9cc c1462604 c189ef80 f51af974 c1710304 f715b450 f715b5ec c2807c40
       00000000 0005bb00 c2803320 c102c55b c1710304 c2807c50 c2803304 00000246
      Call Trace:
       [<c1462604>] ? schedule+0x434/0xb20
       [<c102c55b>] ? resched_task+0x4b/0x70
       [<c106fa22>] ? mark_held_locks+0x62/0x80
       [<c146414d>] ? mutex_lock_nested+0x1fd/0x350
       [<c14640b9>] mutex_lock_nested+0x169/0x350
       [<c1178cde>] ? reiserfs_write_lock+0x2e/0x40
       [<c1178cde>] reiserfs_write_lock+0x2e/0x40
       [<c11719a2>] do_journal_end+0xc2/0xe70
       [<c1172912>] journal_end+0xb2/0x120
       [<c11686b3>] ? pathrelse+0x33/0xb0
       [<c11729e4>] reiserfs_end_persistent_transaction+0x64/0x70
       [<c1153caa>] reiserfs_get_block+0x12ba/0x15f0
       [<c106fa22>] ? mark_held_locks+0x62/0x80
       [<c1154b24>] reiserfs_writepage+0xa74/0xe80
       [<c1465a27>] ? _raw_spin_unlock_irq+0x27/0x50
       [<c11f3d25>] ? radix_tree_gang_lookup_tag_slot+0x95/0xc0
       [<c10b5377>] ? find_get_pages_tag+0x127/0x1a0
       [<c106fa22>] ? mark_held_locks+0x62/0x80
       [<c106fcd4>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c10bc1e0>] __writepage+0x10/0x40
       [<c10bc9ab>] write_cache_pages+0x16b/0x320
       [<c10bc1d0>] ? __writepage+0x0/0x40
       [<c10bcb88>] generic_writepages+0x28/0x40
       [<c10bcbd5>] do_writepages+0x35/0x40
       [<c11059f7>] writeback_single_inode+0xc7/0x330
       [<c11067b2>] writeback_inodes_wb+0x2c2/0x490
       [<c1106a86>] wb_writeback+0x106/0x1b0
       [<c1106cf6>] wb_do_writeback+0x106/0x1e0
       [<c1106c18>] ? wb_do_writeback+0x28/0x1e0
       [<c1106e0a>] bdi_writeback_task+0x3a/0xb0
       [<c10cbb13>] bdi_start_fn+0x63/0xc0
       [<c10cbab0>] ? bdi_start_fn+0x0/0xc0
       [<c105d1f4>] kthread+0x74/0x80
       [<c105d180>] ? kthread+0x0/0x80
       [<c100327a>] kernel_thread_helper+0x6/0x10
      3 locks held by flush-8:0/2149:
       #0:  (&type->s_umount_key#30){+++++.}, at: [<c110676f>] writeback_inodes_wb+0x27f/0x490
       #1:  (&journal->j_mutex){+.+...}, at: [<c117199a>] do_journal_end+0xba/0xe70
       #2:  (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1178cde>] reiserfs_write_lock+0x2e/0x40
      INFO: task fstest:3813 blocked for more than 120 seconds.
      "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
      fstest        D 00000002     0  3813   3812 0x00000000
       f5103c94 00000082 f5103c40 00000002 f5ad5450 00000007 f5103c28 011f3000
       00000006 f5ad5450 c10bb005 00000480 c1710304 f5ad5450 f5ad55ec c2907c40
       00000001 f5ad5450 f5103c74 00000046 00000002 f5ad5450 00000007 f5103c6c
      Call Trace:
       [<c10bb005>] ? free_hot_cold_page+0x1d5/0x280
       [<c1462d64>] io_schedule+0x74/0xc0
       [<c10b5a45>] sync_page+0x35/0x60
       [<c146325a>] __wait_on_bit_lock+0x4a/0x90
       [<c10b5a10>] ? sync_page+0x0/0x60
       [<c10b59e5>] __lock_page+0x85/0x90
       [<c105d660>] ? wake_bit_function+0x0/0x60
       [<c10bf654>] truncate_inode_pages_range+0x1e4/0x2d0
       [<c10bf75f>] truncate_inode_pages+0x1f/0x30
       [<c10bf7cf>] truncate_pagecache+0x5f/0xa0
       [<c10bf86a>] vmtruncate+0x5a/0x70
       [<c10fdb7d>] inode_setattr+0x5d/0x190
       [<c1150117>] reiserfs_setattr+0x1f7/0x2f0
       [<c1464569>] ? down_write+0x49/0x70
       [<c10fde01>] notify_change+0x151/0x330
       [<c10e6f3d>] do_truncate+0x6d/0xa0
       [<c10f4ce2>] do_filp_open+0x9a2/0xcf0
       [<c1465aec>] ? _raw_spin_unlock+0x2c/0x50
       [<c10fec50>] ? alloc_fd+0xe0/0x100
       [<c10e602d>] do_sys_open+0x6d/0x130
       [<c1002cfb>] ? sysenter_exit+0xf/0x16
       [<c10e615e>] sys_open+0x2e/0x40
       [<c1002ccc>] sysenter_do_call+0x12/0x32
      3 locks held by fstest/3813:
       #0:  (&sb->s_type->i_mutex_key#4){+.+.+.}, at: [<c10e6f33>] do_truncate+0x63/0xa0
       #1:  (&sb->s_type->i_alloc_sem_key#3){+.+.+.}, at: [<c10fdf07>] notify_change+0x257/0x330
       #2:  (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1178c8e>] reiserfs_write_lock_once+0x2e/0x50
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Christian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      108d3943
    • Frederic Weisbecker's avatar
      reiserfs: Fix recursive lock on lchown · 5fe1533f
      Frederic Weisbecker authored
      On chown, reiserfs will call reiserfs_setattr() to change the owner
      of the given inode, but it may also recursively call
      reiserfs_setattr() to propagate the owner change to the private xattr
      files for this inode.
      
      Hence, the reiserfs lock may be acquired twice which is not wanted
      as reiserfs_setattr() calls journal_begin() that is going to try to
      relax the lock in order to safely acquire the journal mutex.
      
      Using reiserfs_write_lock_once() from reiserfs_setattr() solves
      the problem.
      
      This fixes the following warning, that precedes a lockdep report.
      
      WARNING: at fs/reiserfs/lock.c:95 reiserfs_lock_check_recursive+0x3f/0x50()
      Hardware name: MS-7418
      Unwanted recursive reiserfs lock!
      Pid: 4189, comm: fsstress Not tainted 2.6.33-rc2-tip-atom+ #195
      Call Trace:
       [<c1178bff>] ? reiserfs_lock_check_recursive+0x3f/0x50
       [<c1178bff>] ? reiserfs_lock_check_recursive+0x3f/0x50
       [<c103f7ac>] warn_slowpath_common+0x6c/0xc0
       [<c1178bff>] ? reiserfs_lock_check_recursive+0x3f/0x50
       [<c103f84b>] warn_slowpath_fmt+0x2b/0x30
       [<c1178bff>] reiserfs_lock_check_recursive+0x3f/0x50
       [<c1172ae3>] do_journal_begin_r+0x83/0x350
       [<c1172f2d>] journal_begin+0x7d/0x140
       [<c106509a>] ? in_group_p+0x2a/0x30
       [<c10fda71>] ? inode_change_ok+0x91/0x140
       [<c115007d>] reiserfs_setattr+0x15d/0x2e0
       [<c10f9bf3>] ? dput+0xe3/0x140
       [<c1465adc>] ? _raw_spin_unlock+0x2c/0x50
       [<c117831d>] chown_one_xattr+0xd/0x10
       [<c11780a3>] reiserfs_for_each_xattr+0x113/0x2c0
       [<c1178310>] ? chown_one_xattr+0x0/0x10
       [<c14641e9>] ? mutex_lock_nested+0x2a9/0x350
       [<c117826f>] reiserfs_chown_xattrs+0x1f/0x60
       [<c106509a>] ? in_group_p+0x2a/0x30
       [<c10fda71>] ? inode_change_ok+0x91/0x140
       [<c1150046>] reiserfs_setattr+0x126/0x2e0
       [<c1177c20>] ? reiserfs_getxattr+0x0/0x90
       [<c11b0d57>] ? cap_inode_need_killpriv+0x37/0x50
       [<c10fde01>] notify_change+0x151/0x330
       [<c10e659f>] chown_common+0x6f/0x90
       [<c10e67bd>] sys_lchown+0x6d/0x80
       [<c1002ccc>] sysenter_do_call+0x12/0x32
      ---[ end trace 7c2b77224c1442fc ]---
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Christian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      5fe1533f
  2. 03 Jan, 2010 1 commit
  3. 02 Jan, 2010 9 commits
    • Frederic Weisbecker's avatar
      reiserfs: Safely acquire i_mutex from xattr_rmdir · 835d5247
      Frederic Weisbecker authored
      Relax the reiserfs lock before taking the inode mutex from
      xattr_rmdir() to avoid the usual reiserfs lock <-> inode mutex
      bad dependency.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Tested-by: default avatarChristian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      835d5247
    • Frederic Weisbecker's avatar
      reiserfs: Safely acquire i_mutex from reiserfs_for_each_xattr · 8b513f56
      Frederic Weisbecker authored
      Relax the reiserfs lock before taking the inode mutex from
      reiserfs_for_each_xattr() to avoid the usual bad dependencies:
      
      =======================================================
      [ INFO: possible circular locking dependency detected ]
      2.6.32-atom #179
      -------------------------------------------------------
      rm/3242 is trying to acquire lock:
       (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c11428ef>] reiserfs_for_each_xattr+0x23f/0x290
      
      but task is already holding lock:
       (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143389>] reiserfs_write_lock+0x29/0x40
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401aab>] mutex_lock_nested+0x5b/0x340
             [<c1143339>] reiserfs_write_lock_once+0x29/0x50
             [<c1117022>] reiserfs_lookup+0x62/0x140
             [<c10bd85f>] __lookup_hash+0xef/0x110
             [<c10bf21d>] lookup_one_len+0x8d/0xc0
             [<c1141e3a>] open_xa_dir+0xea/0x1b0
             [<c1142720>] reiserfs_for_each_xattr+0x70/0x290
             [<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
             [<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
             [<c10c9c32>] generic_delete_inode+0xa2/0x170
             [<c10c9d4f>] generic_drop_inode+0x4f/0x70
             [<c10c8b07>] iput+0x47/0x50
             [<c10c0965>] do_unlinkat+0xd5/0x160
             [<c10c0b13>] sys_unlinkat+0x23/0x40
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      -> #0 (&sb->s_type->i_mutex_key#4/3){+.+.+.}:
             [<c105f176>] __lock_acquire+0x18f6/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401aab>] mutex_lock_nested+0x5b/0x340
             [<c11428ef>] reiserfs_for_each_xattr+0x23f/0x290
             [<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
             [<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
             [<c10c9c32>] generic_delete_inode+0xa2/0x170
             [<c10c9d4f>] generic_drop_inode+0x4f/0x70
             [<c10c8b07>] iput+0x47/0x50
             [<c10c0965>] do_unlinkat+0xd5/0x160
             [<c10c0b13>] sys_unlinkat+0x23/0x40
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      other info that might help us debug this:
      
      1 lock held by rm/3242:
       #0:  (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143389>] reiserfs_write_lock+0x29/0x40
      
      stack backtrace:
      Pid: 3242, comm: rm Not tainted 2.6.32-atom #179
      Call Trace:
       [<c13ffa13>] ? printk+0x18/0x1a
       [<c105d33a>] print_circular_bug+0xca/0xd0
       [<c105f176>] __lock_acquire+0x18f6/0x19e0
       [<c105c932>] ? mark_held_locks+0x62/0x80
       [<c105cc3b>] ? trace_hardirqs_on+0xb/0x10
       [<c1401098>] ? mutex_unlock+0x8/0x10
       [<c105f2c8>] lock_acquire+0x68/0x90
       [<c11428ef>] ? reiserfs_for_each_xattr+0x23f/0x290
       [<c11428ef>] ? reiserfs_for_each_xattr+0x23f/0x290
       [<c1401aab>] mutex_lock_nested+0x5b/0x340
       [<c11428ef>] ? reiserfs_for_each_xattr+0x23f/0x290
       [<c11428ef>] reiserfs_for_each_xattr+0x23f/0x290
       [<c1143180>] ? delete_one_xattr+0x0/0x100
       [<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
       [<c1143339>] ? reiserfs_write_lock_once+0x29/0x50
       [<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
       [<c11b0d4f>] ? _atomic_dec_and_lock+0x4f/0x70
       [<c111e990>] ? reiserfs_delete_inode+0x0/0x150
       [<c10c9c32>] generic_delete_inode+0xa2/0x170
       [<c10c9d4f>] generic_drop_inode+0x4f/0x70
       [<c10c8b07>] iput+0x47/0x50
       [<c10c0965>] do_unlinkat+0xd5/0x160
       [<c1401098>] ? mutex_unlock+0x8/0x10
       [<c10c3e0d>] ? vfs_readdir+0x7d/0xb0
       [<c10c3af0>] ? filldir64+0x0/0xf0
       [<c1002ef3>] ? sysenter_exit+0xf/0x16
       [<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c10c0b13>] sys_unlinkat+0x23/0x40
       [<c1002ec4>] sysenter_do_call+0x12/0x32
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Tested-by: default avatarChristian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      8b513f56
    • Frederic Weisbecker's avatar
      reiserfs: Fix journal mutex <-> inode mutex lock inversion · 4dd85969
      Frederic Weisbecker authored
      We need to relax the reiserfs lock before locking the inode mutex
      from xattr_unlink(), otherwise we'll face the usual bad dependencies:
      
      =======================================================
      [ INFO: possible circular locking dependency detected ]
      2.6.32-atom #178
      -------------------------------------------------------
      rm/3202 is trying to acquire lock:
       (&journal->j_mutex){+.+...}, at: [<c113c234>] do_journal_begin_r+0x94/0x360
      
      but task is already holding lock:
       (&sb->s_type->i_mutex_key#4/2){+.+...}, at: [<c1142a67>] xattr_unlink+0x57/0xb0
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #2 (&sb->s_type->i_mutex_key#4/2){+.+...}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401a7b>] mutex_lock_nested+0x5b/0x340
             [<c1142a67>] xattr_unlink+0x57/0xb0
             [<c1143179>] delete_one_xattr+0x29/0x100
             [<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
             [<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
             [<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
             [<c10c9c32>] generic_delete_inode+0xa2/0x170
             [<c10c9d4f>] generic_drop_inode+0x4f/0x70
             [<c10c8b07>] iput+0x47/0x50
             [<c10c0965>] do_unlinkat+0xd5/0x160
             [<c10c0b13>] sys_unlinkat+0x23/0x40
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      -> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401a7b>] mutex_lock_nested+0x5b/0x340
             [<c1143359>] reiserfs_write_lock+0x29/0x40
             [<c113c23c>] do_journal_begin_r+0x9c/0x360
             [<c113c680>] journal_begin+0x80/0x130
             [<c1127363>] reiserfs_remount+0x223/0x4e0
             [<c10b6dd6>] do_remount_sb+0xa6/0x140
             [<c10ce6a0>] do_mount+0x560/0x750
             [<c10ce914>] sys_mount+0x84/0xb0
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      -> #0 (&journal->j_mutex){+.+...}:
             [<c105f176>] __lock_acquire+0x18f6/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401a7b>] mutex_lock_nested+0x5b/0x340
             [<c113c234>] do_journal_begin_r+0x94/0x360
             [<c113c680>] journal_begin+0x80/0x130
             [<c1116d63>] reiserfs_unlink+0x83/0x2e0
             [<c1142a74>] xattr_unlink+0x64/0xb0
             [<c1143179>] delete_one_xattr+0x29/0x100
             [<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
             [<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
             [<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
             [<c10c9c32>] generic_delete_inode+0xa2/0x170
             [<c10c9d4f>] generic_drop_inode+0x4f/0x70
             [<c10c8b07>] iput+0x47/0x50
             [<c10c0965>] do_unlinkat+0xd5/0x160
             [<c10c0b13>] sys_unlinkat+0x23/0x40
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      other info that might help us debug this:
      
      2 locks held by rm/3202:
       #0:  (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c114274b>] reiserfs_for_each_xattr+0x9b/0x290
       #1:  (&sb->s_type->i_mutex_key#4/2){+.+...}, at: [<c1142a67>] xattr_unlink+0x57/0xb0
      
      stack backtrace:
      Pid: 3202, comm: rm Not tainted 2.6.32-atom #178
      Call Trace:
       [<c13ff9e3>] ? printk+0x18/0x1a
       [<c105d33a>] print_circular_bug+0xca/0xd0
       [<c105f176>] __lock_acquire+0x18f6/0x19e0
       [<c1142a67>] ? xattr_unlink+0x57/0xb0
       [<c105f2c8>] lock_acquire+0x68/0x90
       [<c113c234>] ? do_journal_begin_r+0x94/0x360
       [<c113c234>] ? do_journal_begin_r+0x94/0x360
       [<c1401a7b>] mutex_lock_nested+0x5b/0x340
       [<c113c234>] ? do_journal_begin_r+0x94/0x360
       [<c113c234>] do_journal_begin_r+0x94/0x360
       [<c10411b6>] ? run_timer_softirq+0x1a6/0x220
       [<c103cb00>] ? __do_softirq+0x50/0x140
       [<c113c680>] journal_begin+0x80/0x130
       [<c103cba2>] ? __do_softirq+0xf2/0x140
       [<c104f72f>] ? hrtimer_interrupt+0xdf/0x220
       [<c1116d63>] reiserfs_unlink+0x83/0x2e0
       [<c105c932>] ? mark_held_locks+0x62/0x80
       [<c11b8d08>] ? trace_hardirqs_on_thunk+0xc/0x10
       [<c1002fd8>] ? restore_all_notrace+0x0/0x18
       [<c1142a67>] ? xattr_unlink+0x57/0xb0
       [<c1142a74>] xattr_unlink+0x64/0xb0
       [<c1143179>] delete_one_xattr+0x29/0x100
       [<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
       [<c1143150>] ? delete_one_xattr+0x0/0x100
       [<c1401cb9>] ? mutex_lock_nested+0x299/0x340
       [<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
       [<c1143309>] ? reiserfs_write_lock_once+0x29/0x50
       [<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
       [<c11b0d1f>] ? _atomic_dec_and_lock+0x4f/0x70
       [<c111e990>] ? reiserfs_delete_inode+0x0/0x150
       [<c10c9c32>] generic_delete_inode+0xa2/0x170
       [<c10c9d4f>] generic_drop_inode+0x4f/0x70
       [<c10c8b07>] iput+0x47/0x50
       [<c10c0965>] do_unlinkat+0xd5/0x160
       [<c1401068>] ? mutex_unlock+0x8/0x10
       [<c10c3e0d>] ? vfs_readdir+0x7d/0xb0
       [<c10c3af0>] ? filldir64+0x0/0xf0
       [<c1002ef3>] ? sysenter_exit+0xf/0x16
       [<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c10c0b13>] sys_unlinkat+0x23/0x40
       [<c1002ec4>] sysenter_do_call+0x12/0x32
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Tested-by: default avatarChristian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      4dd85969
    • Frederic Weisbecker's avatar
      reiserfs: Fix unwanted recursive reiserfs lock in reiserfs_unlink() · c674905c
      Frederic Weisbecker authored
      reiserfs_unlink() may or may not be called under the reiserfs
      lock.
      But it also takes the reiserfs lock and can then acquire it
      recursively which leads to do_journal_begin_r() that fails to
      relax the reiserfs lock before grabbing the journal mutex,
      creating an unexpected lock inversion.
      
      We need to ensure reiserfs_unlink() won't get the reiserfs lock
      recursively using reiserfs_write_lock_once().
      
      This fixes the following warning that precedes a lock inversion
      report (reiserfs lock <-> journal mutex).
      
      ------------[ cut here ]------------
      WARNING: at fs/reiserfs/lock.c:95 reiserfs_lock_check_recursive+0x3a/0x50()
      Hardware name: MS-7418
      Unwanted recursive reiserfs lock!
      Pid: 3208, comm: dbench Not tainted 2.6.32-atom #177
      Call Trace:
       [<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
       [<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
       [<c10373a7>] warn_slowpath_common+0x67/0xc0
       [<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
       [<c1037446>] warn_slowpath_fmt+0x26/0x30
       [<c114327a>] reiserfs_lock_check_recursive+0x3a/0x50
       [<c113c213>] do_journal_begin_r+0x83/0x360
       [<c105eb16>] ? __lock_acquire+0x1296/0x19e0
       [<c1142a57>] ? xattr_unlink+0x57/0xb0
       [<c113c670>] journal_begin+0x80/0x130
       [<c1116d5d>] reiserfs_unlink+0x7d/0x2d0
       [<c1142a57>] ? xattr_unlink+0x57/0xb0
       [<c1142a57>] ? xattr_unlink+0x57/0xb0
       [<c1142a57>] ? xattr_unlink+0x57/0xb0
       [<c1142a64>] xattr_unlink+0x64/0xb0
       [<c1143169>] delete_one_xattr+0x29/0x100
       [<c11427ab>] reiserfs_for_each_xattr+0x10b/0x290
       [<c1143140>] ? delete_one_xattr+0x0/0x100
       [<c1401ca9>] ? mutex_lock_nested+0x299/0x340
       [<c11429aa>] reiserfs_delete_xattrs+0x1a/0x60
       [<c11432f9>] ? reiserfs_write_lock_once+0x29/0x50
       [<c111ea1f>] reiserfs_delete_inode+0x9f/0x150
       [<c11b0d0f>] ? _atomic_dec_and_lock+0x4f/0x70
       [<c111e980>] ? reiserfs_delete_inode+0x0/0x150
       [<c10c9c32>] generic_delete_inode+0xa2/0x170
       [<c10c9d4f>] generic_drop_inode+0x4f/0x70
       [<c10c8b07>] iput+0x47/0x50
       [<c10c0965>] do_unlinkat+0xd5/0x160
       [<c10505c6>] ? up_read+0x16/0x30
       [<c1022ab7>] ? do_page_fault+0x187/0x330
       [<c1002fd8>] ? restore_all_notrace+0x0/0x18
       [<c1022930>] ? do_page_fault+0x0/0x330
       [<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c10c0a00>] sys_unlink+0x10/0x20
       [<c1002ec4>] sysenter_do_call+0x12/0x32
      ---[ end trace 2e35d71a6cc69d0c ]---
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Tested-by: default avatarChristian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      c674905c
    • Frederic Weisbecker's avatar
      reiserfs: Relax lock before open xattr dir in reiserfs_xattr_set_handle() · 3f14fea6
      Frederic Weisbecker authored
      We call xattr_lookup() from reiserfs_xattr_get(). We then hold
      the reiserfs lock when we grab the i_mutex. But later, we may
      relax the reiserfs lock, creating dependency inversion between
      both locks.
      
      The lookups and creation jobs ar already protected by the
      inode mutex, so we can safely relax the reiserfs lock, dropping
      the unwanted reiserfs lock -> i_mutex dependency, as shown
      in the following lockdep report:
      
      =======================================================
      [ INFO: possible circular locking dependency detected ]
      2.6.32-atom #173
      -------------------------------------------------------
      cp/3204 is trying to acquire lock:
       (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
      
      but task is already holding lock:
       (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #1 (&sb->s_type->i_mutex_key#4/3){+.+.+.}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401a2b>] mutex_lock_nested+0x5b/0x340
             [<c1141d83>] open_xa_dir+0x43/0x1b0
             [<c1142722>] reiserfs_for_each_xattr+0x62/0x260
             [<c114299a>] reiserfs_delete_xattrs+0x1a/0x60
             [<c111ea1f>] reiserfs_delete_inode+0x9f/0x150
             [<c10c9c32>] generic_delete_inode+0xa2/0x170
             [<c10c9d4f>] generic_drop_inode+0x4f/0x70
             [<c10c8b07>] iput+0x47/0x50
             [<c10c0965>] do_unlinkat+0xd5/0x160
             [<c10c0a00>] sys_unlink+0x10/0x20
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      -> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
             [<c105f176>] __lock_acquire+0x18f6/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401a2b>] mutex_lock_nested+0x5b/0x340
             [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
             [<c1117012>] reiserfs_lookup+0x62/0x140
             [<c10bd85f>] __lookup_hash+0xef/0x110
             [<c10bf21d>] lookup_one_len+0x8d/0xc0
             [<c1141e2a>] open_xa_dir+0xea/0x1b0
             [<c1141fe5>] xattr_lookup+0x15/0x160
             [<c1142476>] reiserfs_xattr_get+0x56/0x2a0
             [<c1144042>] reiserfs_get_acl+0xa2/0x360
             [<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
             [<c111789c>] reiserfs_mkdir+0x6c/0x2c0
             [<c10bea96>] vfs_mkdir+0xd6/0x180
             [<c10c0c10>] sys_mkdirat+0xc0/0xd0
             [<c10c0c40>] sys_mkdir+0x20/0x30
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      other info that might help us debug this:
      
      2 locks held by cp/3204:
       #0:  (&sb->s_type->i_mutex_key#4/1){+.+.+.}, at: [<c10bd8d6>] lookup_create+0x26/0xa0
       #1:  (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
      
      stack backtrace:
      Pid: 3204, comm: cp Not tainted 2.6.32-atom #173
      Call Trace:
       [<c13ff993>] ? printk+0x18/0x1a
       [<c105d33a>] print_circular_bug+0xca/0xd0
       [<c105f176>] __lock_acquire+0x18f6/0x19e0
       [<c105d3aa>] ? check_usage+0x6a/0x460
       [<c105f2c8>] lock_acquire+0x68/0x90
       [<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
       [<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
       [<c1401a2b>] mutex_lock_nested+0x5b/0x340
       [<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
       [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
       [<c1117012>] reiserfs_lookup+0x62/0x140
       [<c105ccca>] ? debug_check_no_locks_freed+0x8a/0x140
       [<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c10bd85f>] __lookup_hash+0xef/0x110
       [<c10bf21d>] lookup_one_len+0x8d/0xc0
       [<c1141e2a>] open_xa_dir+0xea/0x1b0
       [<c1141fe5>] xattr_lookup+0x15/0x160
       [<c1142476>] reiserfs_xattr_get+0x56/0x2a0
       [<c1144042>] reiserfs_get_acl+0xa2/0x360
       [<c10ca2e7>] ? new_inode+0x27/0xa0
       [<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
       [<c1402eb7>] ? _spin_unlock+0x27/0x40
       [<c111789c>] reiserfs_mkdir+0x6c/0x2c0
       [<c10c7cb8>] ? __d_lookup+0x108/0x190
       [<c105c932>] ? mark_held_locks+0x62/0x80
       [<c1401c8d>] ? mutex_lock_nested+0x2bd/0x340
       [<c10bd17a>] ? generic_permission+0x1a/0xa0
       [<c11788fe>] ? security_inode_permission+0x1e/0x20
       [<c10bea96>] vfs_mkdir+0xd6/0x180
       [<c10c0c10>] sys_mkdirat+0xc0/0xd0
       [<c10505c6>] ? up_read+0x16/0x30
       [<c1002fd8>] ? restore_all_notrace+0x0/0x18
       [<c10c0c40>] sys_mkdir+0x20/0x30
       [<c1002ec4>] sysenter_do_call+0x12/0x32
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Tested-by: default avatarChristian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      3f14fea6
    • Frederic Weisbecker's avatar
      reiserfs: Relax reiserfs lock while freeing the journal · 0523676d
      Frederic Weisbecker authored
      Keeping the reiserfs lock while freeing the journal on
      umount path triggers a lock inversion between bdev->bd_mutex
      and the reiserfs lock.
      
      We don't need the reiserfs lock at this stage. The filesystem
      is not usable anymore, and there are no more pending commits,
      everything got flushed (even this operation was done in parallel
      and didn't required the reiserfs lock from the current process).
      
      This fixes the following lockdep report:
      
      =======================================================
      [ INFO: possible circular locking dependency detected ]
      2.6.32-atom #172
      -------------------------------------------------------
      umount/3904 is trying to acquire lock:
       (&bdev->bd_mutex){+.+.+.}, at: [<c10de2c2>] __blkdev_put+0x22/0x160
      
      but task is already holding lock:
       (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143279>] reiserfs_write_lock+0x29/0x40
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #3 (&REISERFS_SB(s)->lock){+.+.+.}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c140199b>] mutex_lock_nested+0x5b/0x340
             [<c1143229>] reiserfs_write_lock_once+0x29/0x50
             [<c111c485>] reiserfs_get_block+0x85/0x1620
             [<c10e1040>] do_mpage_readpage+0x1f0/0x6d0
             [<c10e1640>] mpage_readpages+0xc0/0x100
             [<c1119b89>] reiserfs_readpages+0x19/0x20
             [<c108f1ec>] __do_page_cache_readahead+0x1bc/0x260
             [<c108f2b8>] ra_submit+0x28/0x40
             [<c1087e3e>] filemap_fault+0x40e/0x420
             [<c109b5fd>] __do_fault+0x3d/0x430
             [<c109d47e>] handle_mm_fault+0x12e/0x790
             [<c1022a65>] do_page_fault+0x135/0x330
             [<c1403663>] error_code+0x6b/0x70
             [<c10ef9ca>] load_elf_binary+0x82a/0x1a10
             [<c10ba130>] search_binary_handler+0x90/0x1d0
             [<c10bb70f>] do_execve+0x1df/0x250
             [<c1001746>] sys_execve+0x46/0x70
             [<c1002fa5>] syscall_call+0x7/0xb
      
      -> #2 (&mm->mmap_sem){++++++}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c109b1ab>] might_fault+0x8b/0xb0
             [<c11b8f52>] copy_to_user+0x32/0x70
             [<c10c3b94>] filldir64+0xa4/0xf0
             [<c1109116>] sysfs_readdir+0x116/0x210
             [<c10c3e1d>] vfs_readdir+0x8d/0xb0
             [<c10c3ea9>] sys_getdents64+0x69/0xb0
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      -> #1 (sysfs_mutex){+.+.+.}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c140199b>] mutex_lock_nested+0x5b/0x340
             [<c110951c>] sysfs_addrm_start+0x2c/0xb0
             [<c1109aa0>] create_dir+0x40/0x90
             [<c1109b1b>] sysfs_create_dir+0x2b/0x50
             [<c11b2352>] kobject_add_internal+0xc2/0x1b0
             [<c11b2531>] kobject_add_varg+0x31/0x50
             [<c11b25ac>] kobject_add+0x2c/0x60
             [<c1258294>] device_add+0x94/0x560
             [<c11036ea>] add_partition+0x18a/0x2a0
             [<c110418a>] rescan_partitions+0x33a/0x450
             [<c10de5bf>] __blkdev_get+0x12f/0x2d0
             [<c10de76a>] blkdev_get+0xa/0x10
             [<c11034b8>] register_disk+0x108/0x130
             [<c11a87a9>] add_disk+0xd9/0x130
             [<c12998e5>] sd_probe_async+0x105/0x1d0
             [<c10528af>] async_thread+0xcf/0x230
             [<c104bfd4>] kthread+0x74/0x80
             [<c1003aab>] kernel_thread_helper+0x7/0x3c
      
      -> #0 (&bdev->bd_mutex){+.+.+.}:
             [<c105f176>] __lock_acquire+0x18f6/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c140199b>] mutex_lock_nested+0x5b/0x340
             [<c10de2c2>] __blkdev_put+0x22/0x160
             [<c10de40a>] blkdev_put+0xa/0x10
             [<c113ce22>] free_journal_ram+0xd2/0x130
             [<c113ea18>] do_journal_release+0x98/0x190
             [<c113eb2a>] journal_release+0xa/0x10
             [<c1128eb6>] reiserfs_put_super+0x36/0x130
             [<c10b776f>] generic_shutdown_super+0x4f/0xe0
             [<c10b7825>] kill_block_super+0x25/0x40
             [<c11255df>] reiserfs_kill_sb+0x7f/0x90
             [<c10b7f4a>] deactivate_super+0x7a/0x90
             [<c10cccd8>] mntput_no_expire+0x98/0xd0
             [<c10ccfcc>] sys_umount+0x4c/0x310
             [<c10cd2a9>] sys_oldumount+0x19/0x20
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      other info that might help us debug this:
      
      2 locks held by umount/3904:
       #0:  (&type->s_umount_key#30){+++++.}, at: [<c10b7f45>] deactivate_super+0x75/0x90
       #1:  (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143279>] reiserfs_write_lock+0x29/0x40
      
      stack backtrace:
      Pid: 3904, comm: umount Not tainted 2.6.32-atom #172
      Call Trace:
       [<c13ff903>] ? printk+0x18/0x1a
       [<c105d33a>] print_circular_bug+0xca/0xd0
       [<c105f176>] __lock_acquire+0x18f6/0x19e0
       [<c108b66f>] ? free_pcppages_bulk+0x1f/0x250
       [<c105f2c8>] lock_acquire+0x68/0x90
       [<c10de2c2>] ? __blkdev_put+0x22/0x160
       [<c10de2c2>] ? __blkdev_put+0x22/0x160
       [<c140199b>] mutex_lock_nested+0x5b/0x340
       [<c10de2c2>] ? __blkdev_put+0x22/0x160
       [<c105c932>] ? mark_held_locks+0x62/0x80
       [<c10afe12>] ? kfree+0x92/0xd0
       [<c10de2c2>] __blkdev_put+0x22/0x160
       [<c105cc3b>] ? trace_hardirqs_on+0xb/0x10
       [<c10de40a>] blkdev_put+0xa/0x10
       [<c113ce22>] free_journal_ram+0xd2/0x130
       [<c113ea18>] do_journal_release+0x98/0x190
       [<c113eb2a>] journal_release+0xa/0x10
       [<c1128eb6>] reiserfs_put_super+0x36/0x130
       [<c1050596>] ? up_write+0x16/0x30
       [<c10b776f>] generic_shutdown_super+0x4f/0xe0
       [<c10b7825>] kill_block_super+0x25/0x40
       [<c10f41e0>] ? vfs_quota_off+0x0/0x20
       [<c11255df>] reiserfs_kill_sb+0x7f/0x90
       [<c10b7f4a>] deactivate_super+0x7a/0x90
       [<c10cccd8>] mntput_no_expire+0x98/0xd0
       [<c10ccfcc>] sys_umount+0x4c/0x310
       [<c10cd2a9>] sys_oldumount+0x19/0x20
       [<c1002ec4>] sysenter_do_call+0x12/0x32
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      0523676d
    • Frederic Weisbecker's avatar
      reiserfs: Fix reiserfs lock <-> i_mutex dependency inversion on xattr · 27026a05
      Frederic Weisbecker authored
      While deleting the xattrs of an inode, we hold the reiserfs lock
      and grab the inode->i_mutex of the targeted inode and the root
      private xattr directory.
      
      Later on, we may relax the reiserfs lock for various reasons, this
      creates inverted dependencies.
      
      We can remove the reiserfs lock -> i_mutex dependency by relaxing
      the former before calling open_xa_dir(). This is fine because the
      lookup and creation of xattr private directories done in
      open_xa_dir() are covered by the targeted inode mutexes. And deeper
      operations in the tree are still done under the write lock.
      
      This fixes the following lockdep report:
      
      =======================================================
      [ INFO: possible circular locking dependency detected ]
      2.6.32-atom #173
      -------------------------------------------------------
      cp/3204 is trying to acquire lock:
       (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
      
      but task is already holding lock:
       (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #1 (&sb->s_type->i_mutex_key#4/3){+.+.+.}:
             [<c105ea7f>] __lock_acquire+0x11ff/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401a2b>] mutex_lock_nested+0x5b/0x340
             [<c1141d83>] open_xa_dir+0x43/0x1b0
             [<c1142722>] reiserfs_for_each_xattr+0x62/0x260
             [<c114299a>] reiserfs_delete_xattrs+0x1a/0x60
             [<c111ea1f>] reiserfs_delete_inode+0x9f/0x150
             [<c10c9c32>] generic_delete_inode+0xa2/0x170
             [<c10c9d4f>] generic_drop_inode+0x4f/0x70
             [<c10c8b07>] iput+0x47/0x50
             [<c10c0965>] do_unlinkat+0xd5/0x160
             [<c10c0a00>] sys_unlink+0x10/0x20
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      -> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
             [<c105f176>] __lock_acquire+0x18f6/0x19e0
             [<c105f2c8>] lock_acquire+0x68/0x90
             [<c1401a2b>] mutex_lock_nested+0x5b/0x340
             [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
             [<c1117012>] reiserfs_lookup+0x62/0x140
             [<c10bd85f>] __lookup_hash+0xef/0x110
             [<c10bf21d>] lookup_one_len+0x8d/0xc0
             [<c1141e2a>] open_xa_dir+0xea/0x1b0
             [<c1141fe5>] xattr_lookup+0x15/0x160
             [<c1142476>] reiserfs_xattr_get+0x56/0x2a0
             [<c1144042>] reiserfs_get_acl+0xa2/0x360
             [<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
             [<c111789c>] reiserfs_mkdir+0x6c/0x2c0
             [<c10bea96>] vfs_mkdir+0xd6/0x180
             [<c10c0c10>] sys_mkdirat+0xc0/0xd0
             [<c10c0c40>] sys_mkdir+0x20/0x30
             [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      other info that might help us debug this:
      
      2 locks held by cp/3204:
       #0:  (&sb->s_type->i_mutex_key#4/1){+.+.+.}, at: [<c10bd8d6>] lookup_create+0x26/0xa0
       #1:  (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
      
      stack backtrace:
      Pid: 3204, comm: cp Not tainted 2.6.32-atom #173
      Call Trace:
       [<c13ff993>] ? printk+0x18/0x1a
       [<c105d33a>] print_circular_bug+0xca/0xd0
       [<c105f176>] __lock_acquire+0x18f6/0x19e0
       [<c105d3aa>] ? check_usage+0x6a/0x460
       [<c105f2c8>] lock_acquire+0x68/0x90
       [<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
       [<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
       [<c1401a2b>] mutex_lock_nested+0x5b/0x340
       [<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
       [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
       [<c1117012>] reiserfs_lookup+0x62/0x140
       [<c105ccca>] ? debug_check_no_locks_freed+0x8a/0x140
       [<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c10bd85f>] __lookup_hash+0xef/0x110
       [<c10bf21d>] lookup_one_len+0x8d/0xc0
       [<c1141e2a>] open_xa_dir+0xea/0x1b0
       [<c1141fe5>] xattr_lookup+0x15/0x160
       [<c1142476>] reiserfs_xattr_get+0x56/0x2a0
       [<c1144042>] reiserfs_get_acl+0xa2/0x360
       [<c10ca2e7>] ? new_inode+0x27/0xa0
       [<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
       [<c1402eb7>] ? _spin_unlock+0x27/0x40
       [<c111789c>] reiserfs_mkdir+0x6c/0x2c0
       [<c10c7cb8>] ? __d_lookup+0x108/0x190
       [<c105c932>] ? mark_held_locks+0x62/0x80
       [<c1401c8d>] ? mutex_lock_nested+0x2bd/0x340
       [<c10bd17a>] ? generic_permission+0x1a/0xa0
       [<c11788fe>] ? security_inode_permission+0x1e/0x20
       [<c10bea96>] vfs_mkdir+0xd6/0x180
       [<c10c0c10>] sys_mkdirat+0xc0/0xd0
       [<c10505c6>] ? up_read+0x16/0x30
       [<c1002fd8>] ? restore_all_notrace+0x0/0x18
       [<c10c0c40>] sys_mkdir+0x20/0x30
       [<c1002ec4>] sysenter_do_call+0x12/0x32
      
      v2: Don't drop reiserfs_mutex_lock_nested_safe() as we'll still
          need it later
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Tested-by: default avatarChristian Kujau <lists@nerdbynature.de>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      27026a05
    • Frederic Weisbecker's avatar
      reiserfs: Warn on lock relax if taken recursively · c4a62ca3
      Frederic Weisbecker authored
      When we relax the reiserfs lock to avoid creating unwanted
      dependencies against others locks while grabbing these,
      we want to ensure it has not been taken recursively, otherwise
      the lock won't be really relaxed. Only its depth will be decreased.
      The unwanted dependency would then actually happen.
      
      To prevent from that, add a reiserfs_lock_check_recursive() call
      in the places that need it.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      c4a62ca3
    • Frederic Weisbecker's avatar
      reiserfs: Fix reiserfs lock <-> i_xattr_sem dependency inversion · 0719d343
      Frederic Weisbecker authored
      i_xattr_sem depends on the reiserfs lock. But after we grab
      i_xattr_sem, we may relax/relock the reiserfs lock while waiting
      on a freezed filesystem, creating a dependency inversion between
      the two locks.
      
      In order to avoid the i_xattr_sem -> reiserfs lock dependency, let's
      create a reiserfs_down_read_safe() that acts like
      reiserfs_mutex_lock_safe(): relax the reiserfs lock while grabbing
      another lock to avoid undesired dependencies induced by the
      heivyweight reiserfs lock.
      
      This fixes the following warning:
      
      [  990.005931] =======================================================
      [  990.012373] [ INFO: possible circular locking dependency detected ]
      [  990.013233] 2.6.33-rc1 #1
      [  990.013233] -------------------------------------------------------
      [  990.013233] dbench/1891 is trying to acquire lock:
      [  990.013233]  (&REISERFS_SB(s)->lock){+.+.+.}, at: [<ffffffff81159505>] reiserfs_write_lock+0x35/0x50
      [  990.013233]
      [  990.013233] but task is already holding lock:
      [  990.013233]  (&REISERFS_I(inode)->i_xattr_sem){+.+.+.}, at: [<ffffffff8115899a>] reiserfs_xattr_set_handle+0x8a/0x470
      [  990.013233]
      [  990.013233] which lock already depends on the new lock.
      [  990.013233]
      [  990.013233]
      [  990.013233] the existing dependency chain (in reverse order) is:
      [  990.013233]
      [  990.013233] -> #1 (&REISERFS_I(inode)->i_xattr_sem){+.+.+.}:
      [  990.013233]        [<ffffffff81063afc>] __lock_acquire+0xf9c/0x1560
      [  990.013233]        [<ffffffff8106414f>] lock_acquire+0x8f/0xb0
      [  990.013233]        [<ffffffff814ac194>] down_write+0x44/0x80
      [  990.013233]        [<ffffffff8115899a>] reiserfs_xattr_set_handle+0x8a/0x470
      [  990.013233]        [<ffffffff81158e30>] reiserfs_xattr_set+0xb0/0x150
      [  990.013233]        [<ffffffff8115a6aa>] user_set+0x8a/0x90
      [  990.013233]        [<ffffffff8115901a>] reiserfs_setxattr+0xaa/0xb0
      [  990.013233]        [<ffffffff810e2596>] __vfs_setxattr_noperm+0x36/0xa0
      [  990.013233]        [<ffffffff810e26bc>] vfs_setxattr+0xbc/0xc0
      [  990.013233]        [<ffffffff810e2780>] setxattr+0xc0/0x150
      [  990.013233]        [<ffffffff810e289d>] sys_fsetxattr+0x8d/0xa0
      [  990.013233]        [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
      [  990.013233]
      [  990.013233] -> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
      [  990.013233]        [<ffffffff81063e30>] __lock_acquire+0x12d0/0x1560
      [  990.013233]        [<ffffffff8106414f>] lock_acquire+0x8f/0xb0
      [  990.013233]        [<ffffffff814aba77>] __mutex_lock_common+0x47/0x3b0
      [  990.013233]        [<ffffffff814abebe>] mutex_lock_nested+0x3e/0x50
      [  990.013233]        [<ffffffff81159505>] reiserfs_write_lock+0x35/0x50
      [  990.013233]        [<ffffffff811340e5>] reiserfs_prepare_write+0x45/0x180
      [  990.013233]        [<ffffffff81158bb6>] reiserfs_xattr_set_handle+0x2a6/0x470
      [  990.013233]        [<ffffffff81158e30>] reiserfs_xattr_set+0xb0/0x150
      [  990.013233]        [<ffffffff8115a6aa>] user_set+0x8a/0x90
      [  990.013233]        [<ffffffff8115901a>] reiserfs_setxattr+0xaa/0xb0
      [  990.013233]        [<ffffffff810e2596>] __vfs_setxattr_noperm+0x36/0xa0
      [  990.013233]        [<ffffffff810e26bc>] vfs_setxattr+0xbc/0xc0
      [  990.013233]        [<ffffffff810e2780>] setxattr+0xc0/0x150
      [  990.013233]        [<ffffffff810e289d>] sys_fsetxattr+0x8d/0xa0
      [  990.013233]        [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
      [  990.013233]
      [  990.013233] other info that might help us debug this:
      [  990.013233]
      [  990.013233] 2 locks held by dbench/1891:
      [  990.013233]  #0:  (&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff810e2678>] vfs_setxattr+0x78/0xc0
      [  990.013233]  #1:  (&REISERFS_I(inode)->i_xattr_sem){+.+.+.}, at: [<ffffffff8115899a>] reiserfs_xattr_set_handle+0x8a/0x470
      [  990.013233]
      [  990.013233] stack backtrace:
      [  990.013233] Pid: 1891, comm: dbench Not tainted 2.6.33-rc1 #1
      [  990.013233] Call Trace:
      [  990.013233]  [<ffffffff81061639>] print_circular_bug+0xe9/0xf0
      [  990.013233]  [<ffffffff81063e30>] __lock_acquire+0x12d0/0x1560
      [  990.013233]  [<ffffffff8115899a>] ? reiserfs_xattr_set_handle+0x8a/0x470
      [  990.013233]  [<ffffffff8106414f>] lock_acquire+0x8f/0xb0
      [  990.013233]  [<ffffffff81159505>] ? reiserfs_write_lock+0x35/0x50
      [  990.013233]  [<ffffffff8115899a>] ? reiserfs_xattr_set_handle+0x8a/0x470
      [  990.013233]  [<ffffffff814aba77>] __mutex_lock_common+0x47/0x3b0
      [  990.013233]  [<ffffffff81159505>] ? reiserfs_write_lock+0x35/0x50
      [  990.013233]  [<ffffffff81159505>] ? reiserfs_write_lock+0x35/0x50
      [  990.013233]  [<ffffffff81062592>] ? mark_held_locks+0x72/0xa0
      [  990.013233]  [<ffffffff814ab81d>] ? __mutex_unlock_slowpath+0xbd/0x140
      [  990.013233]  [<ffffffff810628ad>] ? trace_hardirqs_on_caller+0x14d/0x1a0
      [  990.013233]  [<ffffffff814abebe>] mutex_lock_nested+0x3e/0x50
      [  990.013233]  [<ffffffff81159505>] reiserfs_write_lock+0x35/0x50
      [  990.013233]  [<ffffffff811340e5>] reiserfs_prepare_write+0x45/0x180
      [  990.013233]  [<ffffffff81158bb6>] reiserfs_xattr_set_handle+0x2a6/0x470
      [  990.013233]  [<ffffffff81158e30>] reiserfs_xattr_set+0xb0/0x150
      [  990.013233]  [<ffffffff814abcb4>] ? __mutex_lock_common+0x284/0x3b0
      [  990.013233]  [<ffffffff8115a6aa>] user_set+0x8a/0x90
      [  990.013233]  [<ffffffff8115901a>] reiserfs_setxattr+0xaa/0xb0
      [  990.013233]  [<ffffffff810e2596>] __vfs_setxattr_noperm+0x36/0xa0
      [  990.013233]  [<ffffffff810e26bc>] vfs_setxattr+0xbc/0xc0
      [  990.013233]  [<ffffffff810e2780>] setxattr+0xc0/0x150
      [  990.013233]  [<ffffffff81056018>] ? sched_clock_cpu+0xb8/0x100
      [  990.013233]  [<ffffffff8105eded>] ? trace_hardirqs_off+0xd/0x10
      [  990.013233]  [<ffffffff810560a3>] ? cpu_clock+0x43/0x50
      [  990.013233]  [<ffffffff810c6820>] ? fget+0xb0/0x110
      [  990.013233]  [<ffffffff810c6770>] ? fget+0x0/0x110
      [  990.013233]  [<ffffffff81002ddc>] ? sysret_check+0x27/0x62
      [  990.013233]  [<ffffffff810e289d>] sys_fsetxattr+0x8d/0xa0
      [  990.013233]  [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
      Reported-and-tested-by: default avatarChristian Kujau <lists@nerdbynature.de>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Alexander Beregalov <a.beregalov@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      0719d343
  4. 29 Dec, 2009 1 commit
  5. 16 Dec, 2009 1 commit
    • Frederic Weisbecker's avatar
      reiserfs: Fix reiserfs lock <-> inode mutex dependency inversion · 47376ceb
      Frederic Weisbecker authored
      The reiserfs lock -> inode mutex dependency gets inverted when we
      relax the lock while walking to the tree.
      
      To fix this, use a specialized version of reiserfs_mutex_lock_safe
      that takes care of mutex subclasses. Then we can grab the inode
      mutex with I_MUTEX_XATTR subclass without any reiserfs lock
      dependency.
      
      This fixes the following report:
      
      [ INFO: possible circular locking dependency detected ]
      2.6.32-06793-gf4054253-dirty #2
      -------------------------------------------------------
      mv/18566 is trying to acquire lock:
       (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1110708>] reiserfs_write_lock+0x28=
      /0x40
      
      but task is already holding lock:
       (&sb->s_type->i_mutex_key#5/3){+.+.+.}, at: [<c111033c>]
      reiserfs_for_each_xattr+0x10c/0x380
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #1 (&sb->s_type->i_mutex_key#5/3){+.+.+.}:
             [<c104f723>] validate_chain+0xa23/0xf70
             [<c1050155>] __lock_acquire+0x4e5/0xa70
             [<c105075a>] lock_acquire+0x7a/0xa0
             [<c134c76f>] mutex_lock_nested+0x5f/0x2b0
             [<c11102b4>] reiserfs_for_each_xattr+0x84/0x380
             [<c1110615>] reiserfs_delete_xattrs+0x15/0x50
             [<c10ef57f>] reiserfs_delete_inode+0x8f/0x140
             [<c10a565c>] generic_delete_inode+0x9c/0x150
             [<c10a574d>] generic_drop_inode+0x3d/0x60
             [<c10a4667>] iput+0x47/0x50
             [<c109cc0b>] do_unlinkat+0xdb/0x160
             [<c109cca0>] sys_unlink+0x10/0x20
             [<c1002c50>] sysenter_do_call+0x12/0x36
      
      -> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
             [<c104fc68>] validate_chain+0xf68/0xf70
             [<c1050155>] __lock_acquire+0x4e5/0xa70
             [<c105075a>] lock_acquire+0x7a/0xa0
             [<c134c76f>] mutex_lock_nested+0x5f/0x2b0
             [<c1110708>] reiserfs_write_lock+0x28/0x40
             [<c1103d6b>] search_by_key+0x1f7b/0x21b0
             [<c10e73ef>] search_by_entry_key+0x1f/0x3b0
             [<c10e77f7>] reiserfs_find_entry+0x77/0x400
             [<c10e81e5>] reiserfs_lookup+0x85/0x130
             [<c109a144>] __lookup_hash+0xb4/0x110
             [<c109b763>] lookup_one_len+0xb3/0x100
             [<c1110350>] reiserfs_for_each_xattr+0x120/0x380
             [<c1110615>] reiserfs_delete_xattrs+0x15/0x50
             [<c10ef57f>] reiserfs_delete_inode+0x8f/0x140
             [<c10a565c>] generic_delete_inode+0x9c/0x150
             [<c10a574d>] generic_drop_inode+0x3d/0x60
             [<c10a4667>] iput+0x47/0x50
             [<c10a1c4f>] dentry_iput+0x6f/0xf0
             [<c10a1d74>] d_kill+0x24/0x50
             [<c10a396b>] dput+0x5b/0x120
             [<c109ca89>] sys_renameat+0x1b9/0x230
             [<c109cb28>] sys_rename+0x28/0x30
             [<c1002c50>] sysenter_do_call+0x12/0x36
      
      other info that might help us debug this:
      
      2 locks held by mv/18566:
       #0:  (&sb->s_type->i_mutex_key#5/1){+.+.+.}, at: [<c109b6ac>]
      lock_rename+0xcc/0xd0
       #1:  (&sb->s_type->i_mutex_key#5/3){+.+.+.}, at: [<c111033c>]
      reiserfs_for_each_xattr+0x10c/0x380
      
      stack backtrace:
      Pid: 18566, comm: mv Tainted: G         C 2.6.32-06793-gf4054253-dirty #2
      Call Trace:
       [<c134b252>] ? printk+0x18/0x1e
       [<c104e790>] print_circular_bug+0xc0/0xd0
       [<c104fc68>] validate_chain+0xf68/0xf70
       [<c104c8cb>] ? trace_hardirqs_off+0xb/0x10
       [<c1050155>] __lock_acquire+0x4e5/0xa70
       [<c105075a>] lock_acquire+0x7a/0xa0
       [<c1110708>] ? reiserfs_write_lock+0x28/0x40
       [<c134c76f>] mutex_lock_nested+0x5f/0x2b0
       [<c1110708>] ? reiserfs_write_lock+0x28/0x40
       [<c1110708>] ? reiserfs_write_lock+0x28/0x40
       [<c134b60a>] ? schedule+0x27a/0x440
       [<c1110708>] reiserfs_write_lock+0x28/0x40
       [<c1103d6b>] search_by_key+0x1f7b/0x21b0
       [<c1050176>] ? __lock_acquire+0x506/0xa70
       [<c1051267>] ? lock_release_non_nested+0x1e7/0x340
       [<c1110708>] ? reiserfs_write_lock+0x28/0x40
       [<c104e354>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c104e3ab>] ? trace_hardirqs_on+0xb/0x10
       [<c1042a55>] ? T.316+0x15/0x1a0
       [<c1042d2d>] ? sched_clock_cpu+0x9d/0x100
       [<c10e73ef>] search_by_entry_key+0x1f/0x3b0
       [<c134bf2a>] ? __mutex_unlock_slowpath+0x9a/0x120
       [<c104e354>] ? trace_hardirqs_on_caller+0x124/0x170
       [<c10e77f7>] reiserfs_find_entry+0x77/0x400
       [<c10e81e5>] reiserfs_lookup+0x85/0x130
       [<c1042d2d>] ? sched_clock_cpu+0x9d/0x100
       [<c109a144>] __lookup_hash+0xb4/0x110
       [<c109b763>] lookup_one_len+0xb3/0x100
       [<c1110350>] reiserfs_for_each_xattr+0x120/0x380
       [<c110ffe0>] ? delete_one_xattr+0x0/0x1c0
       [<c1003342>] ? math_error+0x22/0x150
       [<c1110708>] ? reiserfs_write_lock+0x28/0x40
       [<c1110615>] reiserfs_delete_xattrs+0x15/0x50
       [<c1110708>] ? reiserfs_write_lock+0x28/0x40
       [<c10ef57f>] reiserfs_delete_inode+0x8f/0x140
       [<c10a561f>] ? generic_delete_inode+0x5f/0x150
       [<c10ef4f0>] ? reiserfs_delete_inode+0x0/0x140
       [<c10a565c>] generic_delete_inode+0x9c/0x150
       [<c10a574d>] generic_drop_inode+0x3d/0x60
       [<c10a4667>] iput+0x47/0x50
       [<c10a1c4f>] dentry_iput+0x6f/0xf0
       [<c10a1d74>] d_kill+0x24/0x50
       [<c10a396b>] dput+0x5b/0x120
       [<c109ca89>] sys_renameat+0x1b9/0x230
       [<c1042d2d>] ? sched_clock_cpu+0x9d/0x100
       [<c104c8cb>] ? trace_hardirqs_off+0xb/0x10
       [<c1042dde>] ? cpu_clock+0x4e/0x60
       [<c1350825>] ? do_page_fault+0x155/0x370
       [<c1041816>] ? up_read+0x16/0x30
       [<c1350825>] ? do_page_fault+0x155/0x370
       [<c109cb28>] sys_rename+0x28/0x30
       [<c1002c50>] sysenter_do_call+0x12/0x36
      Reported-by: default avatarAlexander Beregalov <a.beregalov@gmail.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      47376ceb
  6. 14 Dec, 2009 2 commits
    • Frederic Weisbecker's avatar
      reiserfs: Fix reiserfs lock and journal lock inversion dependency · cb1c2e51
      Frederic Weisbecker authored
      When we were using the bkl, we didn't care about dependencies against
      other locks, but the mutex conversion created new ones, which is why
      we have reiserfs_mutex_lock_safe(), which unlocks the reiserfs lock
      before acquiring another mutex.
      
      But this trick actually fails if we have acquired the reiserfs lock
      recursively, as we try to unlock it to acquire the new mutex without
      inverted dependency, but we eventually only decrease its depth.
      
      This happens in the case of a nested inode creation/deletion.
      Say we have no space left on the device, we create an inode
      and tak the lock but fail to create its entry, then we release the
      inode using iput(), which calls reiserfs_delete_inode() that takes
      the reiserfs lock recursively. The path eventually ends up in
      journal_begin() where we try to take the journal safely but we
      fail because of the reiserfs lock recursion:
      
      [ INFO: possible circular locking dependency detected ]
      2.6.32-06486-g053fe57a #2
      -------------------------------------------------------
      vi/23454 is trying to acquire lock:
       (&journal->j_mutex){+.+...}, at: [<c110dac4>] do_journal_begin_r+0x64/0x2f0
      
      but task is already holding lock:
       (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11106a8>] reiserfs_write_lock+0x28/0x40
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
             [<c104f8f3>] validate_chain+0xa23/0xf70
             [<c1050325>] __lock_acquire+0x4e5/0xa70
             [<c105092a>] lock_acquire+0x7a/0xa0
             [<c134c78f>] mutex_lock_nested+0x5f/0x2b0
             [<c11106a8>] reiserfs_write_lock+0x28/0x40
             [<c110dacb>] do_journal_begin_r+0x6b/0x2f0
             [<c110ddcf>] journal_begin+0x7f/0x120
             [<c10f76c2>] reiserfs_remount+0x212/0x4d0
             [<c1093997>] do_remount_sb+0x67/0x140
             [<c10a9ca6>] do_mount+0x436/0x6b0
             [<c10a9f86>] sys_mount+0x66/0xa0
             [<c1002c50>] sysenter_do_call+0x12/0x36
      
      -> #0 (&journal->j_mutex){+.+...}:
             [<c104fe38>] validate_chain+0xf68/0xf70
             [<c1050325>] __lock_acquire+0x4e5/0xa70
             [<c105092a>] lock_acquire+0x7a/0xa0
             [<c134c78f>] mutex_lock_nested+0x5f/0x2b0
             [<c110dac4>] do_journal_begin_r+0x64/0x2f0
             [<c110ddcf>] journal_begin+0x7f/0x120
             [<c10ef52f>] reiserfs_delete_inode+0x9f/0x140
             [<c10a55fc>] generic_delete_inode+0x9c/0x150
             [<c10a56ed>] generic_drop_inode+0x3d/0x60
             [<c10a4607>] iput+0x47/0x50
             [<c10e915c>] reiserfs_create+0x16c/0x1c0
             [<c109a9c1>] vfs_create+0xc1/0x130
             [<c109dbec>] do_filp_open+0x81c/0x920
             [<c109004f>] do_sys_open+0x4f/0x110
             [<c1090179>] sys_open+0x29/0x40
             [<c1002c50>] sysenter_do_call+0x12/0x36
      
      other info that might help us debug this:
      
      2 locks held by vi/23454:
       #0:  (&sb->s_type->i_mutex_key#5){+.+.+.}, at: [<c109d64e>]
      do_filp_open+0x27e/0x920
       #1:  (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11106a8>]
      reiserfs_write_lock+0x28/0x40
      
      stack backtrace:
      Pid: 23454, comm: vi Not tainted 2.6.32-06486-g053fe57a #2
      Call Trace:
       [<c134b202>] ? printk+0x18/0x1e
       [<c104e960>] print_circular_bug+0xc0/0xd0
       [<c104fe38>] validate_chain+0xf68/0xf70
       [<c104ca9b>] ? trace_hardirqs_off+0xb/0x10
       [<c1050325>] __lock_acquire+0x4e5/0xa70
       [<c105092a>] lock_acquire+0x7a/0xa0
       [<c110dac4>] ? do_journal_begin_r+0x64/0x2f0
       [<c134c78f>] mutex_lock_nested+0x5f/0x2b0
       [<c110dac4>] ? do_journal_begin_r+0x64/0x2f0
       [<c110dac4>] ? do_journal_begin_r+0x64/0x2f0
       [<c110ff80>] ? delete_one_xattr+0x0/0x1c0
       [<c110dac4>] do_journal_begin_r+0x64/0x2f0
       [<c110ddcf>] journal_begin+0x7f/0x120
       [<c11105b5>] ? reiserfs_delete_xattrs+0x15/0x50
       [<c10ef52f>] reiserfs_delete_inode+0x9f/0x140
       [<c10a55bf>] ? generic_delete_inode+0x5f/0x150
       [<c10ef490>] ? reiserfs_delete_inode+0x0/0x140
       [<c10a55fc>] generic_delete_inode+0x9c/0x150
       [<c10a56ed>] generic_drop_inode+0x3d/0x60
       [<c10a4607>] iput+0x47/0x50
       [<c10e915c>] reiserfs_create+0x16c/0x1c0
       [<c1099a5d>] ? inode_permission+0x7d/0xa0
       [<c109a9c1>] vfs_create+0xc1/0x130
       [<c10e8ff0>] ? reiserfs_create+0x0/0x1c0
       [<c109dbec>] do_filp_open+0x81c/0x920
       [<c104ca9b>] ? trace_hardirqs_off+0xb/0x10
       [<c134dc0d>] ? _spin_unlock+0x1d/0x20
       [<c10a6eea>] ? alloc_fd+0xba/0xf0
       [<c109004f>] do_sys_open+0x4f/0x110
       [<c1090179>] sys_open+0x29/0x40
       [<c1002c50>] sysenter_do_call+0x12/0x36
      
      To fix this, use reiserfs_lock_once() from reiserfs_delete_inode()
      which prevents from adding reiserfs lock recursion.
      Reported-by: default avatarAlexander Beregalov <a.beregalov@gmail.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      cb1c2e51
    • Frederic Weisbecker's avatar
      reiserfs: Fix possible recursive lock · 500f5a0b
      Frederic Weisbecker authored
      While allocating the bitmap using vmalloc, we hold the reiserfs lock,
      which makes lockdep later reporting a possible deadlock as we may
      swap out pages to allocate memory and then take the reiserfs lock
      recursively:
      
      inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
      kswapd0/312 [HC0[0]:SC0[0]:HE1:SE1] takes:
       (&REISERFS_SB(s)->lock){+.+.?.}, at: [<c11108a8>] reiserfs_write_lock+0x28/0x40
      {RECLAIM_FS-ON-W} state was registered at:
        [<c104e1c2>] mark_held_locks+0x62/0x90
        [<c104e28a>] lockdep_trace_alloc+0x9a/0xc0
        [<c108e396>] kmem_cache_alloc+0x26/0xf0
        [<c10850ec>] __get_vm_area_node+0x6c/0xf0
        [<c10857de>] __vmalloc_node+0x7e/0xa0
        [<c108597b>] vmalloc+0x2b/0x30
        [<c10e00b9>] reiserfs_init_bitmap_cache+0x39/0x70
        [<c10f8178>] reiserfs_fill_super+0x2e8/0xb90
        [<c1094345>] get_sb_bdev+0x145/0x180
        [<c10f5a11>] get_super_block+0x21/0x30
        [<c10931f0>] vfs_kern_mount+0x40/0xd0
        [<c10932d9>] do_kern_mount+0x39/0xd0
        [<c10a9857>] do_mount+0x2c7/0x6b0
        [<c10a9ca6>] sys_mount+0x66/0xa0
        [<c161589b>] mount_block_root+0xc4/0x245
        [<c1615a75>] mount_root+0x59/0x5f
        [<c1615b8c>] prepare_namespace+0x111/0x14b
        [<c1615269>] kernel_init+0xcf/0xdb
        [<c10031fb>] kernel_thread_helper+0x7/0x1c
      
      This is actually fine for two reasons: we call vmalloc at mount time
      then it's not in the swapping out path. Also the reiserfs lock can be
      acquired recursively, but since its implementation depends on a mutex,
      it's hard and not necessary worth it to teach that to lockdep.
      
      The lock is useless at mount time anyway, at least until we replay the
      journal. But let's remove it from this path later as this needs
      more thinking and is a sensible change.
      
      For now we can just relax the lock around vmalloc,
      Reported-by: default avatarAlexander Beregalov <a.beregalov@gmail.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      500f5a0b
  7. 07 Dec, 2009 1 commit
  8. 03 Dec, 2009 1 commit
  9. 02 Dec, 2009 21 commits