1. 25 Oct, 2013 12 commits
  2. 05 Oct, 2013 1 commit
    • Darrick J. Wong's avatar
      btrfs: Fix crash due to not allocating integrity data for a bioset · b208c2f7
      Darrick J. Wong authored
      
      
      When btrfs creates a bioset, we must also allocate the integrity data pool.
      Otherwise btrfs will crash when it tries to submit a bio to a checksumming
      disk:
      
       BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
       IP: [<ffffffff8111e28a>] mempool_alloc+0x4a/0x150
       PGD 2305e4067 PUD 23063d067 PMD 0
       Oops: 0000 [#1] PREEMPT SMP
       Modules linked in: btrfs scsi_debug xfs ext4 jbd2 ext3 jbd mbcache
      sch_fq_codel eeprom lpc_ich mfd_core nfsd exportfs auth_rpcgss af_packet
      raid6_pq xor zlib_deflate libcrc32c [last unloaded: scsi_debug]
       CPU: 1 PID: 4486 Comm: mount Not tainted 3.12.0-rc1-mcsum #2
       Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
       task: ffff8802451c9720 ti: ffff880230698000 task.ti: ffff880230698000
       RIP: 0010:[<ffffffff8111e28a>]  [<ffffffff8111e28a>] mempool_alloc+0x4a/0x150
       RSP: 0018:ffff880230699688  EFLAGS: 00010286
       RAX: 0000000000000001 RBX: 0000000000000000 RCX: 00000000005f8445
       RDX: 0000000000000001 RSI: 0000000000000010 RDI: 0000000000000000
       RBP: ffff8802306996f8 R08: 0000000000011200 R09: 0000000000000008
       R10: 0000000000000020 R11: ffff88009d6e8000 R12: 0000000000011210
       R13: 0000000000000030 R14: ffff8802306996b8 R15: ffff8802451c9720
       FS:  00007f25b8a16800(0000) GS:ffff88024fc80000(0000) knlGS:0000000000000000
       CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
       CR2: 0000000000000018 CR3: 0000000230576000 CR4: 00000000000007e0
       Stack:
        ffff8802451c9720 0000000000000002 ffffffff81a97100 0000000000281250
        ffffffff81a96480 ffff88024fc99150 ffff880228d18200 0000000000000000
        0000000000000000 0000000000000040 ffff880230e8c2e8 ffff8802459dc900
       Call Trace:
        [<ffffffff811b2208>] bio_integrity_alloc+0x48/0x1b0
        [<ffffffff811b26fc>] bio_integrity_prep+0xac/0x360
        [<ffffffff8111e298>] ? mempool_alloc+0x58/0x150
        [<ffffffffa03e8041>] ? alloc_extent_state+0x31/0x110 [btrfs]
        [<ffffffff81241579>] blk_queue_bio+0x1c9/0x460
        [<ffffffff8123e58a>] generic_make_request+0xca/0x100
        [<ffffffff8123e639>] submit_bio+0x79/0x160
        [<ffffffffa03f865e>] btrfs_map_bio+0x48e/0x5b0 [btrfs]
        [<ffffffffa03c821a>] btree_submit_bio_hook+0xda/0x110 [btrfs]
        [<ffffffffa03e7eba>] submit_one_bio+0x6a/0xa0 [btrfs]
        [<ffffffffa03ef450>] read_extent_buffer_pages+0x250/0x310 [btrfs]
        [<ffffffff8125eef6>] ? __radix_tree_preload+0x66/0xf0
        [<ffffffff8125f1c5>] ? radix_tree_insert+0x95/0x260
        [<ffffffffa03c66f6>] btree_read_extent_buffer_pages.constprop.128+0xb6/0x120
      [btrfs]
        [<ffffffffa03c8c1a>] read_tree_block+0x3a/0x60 [btrfs]
        [<ffffffffa03caefd>] open_ctree+0x139d/0x2030 [btrfs]
        [<ffffffffa03a282a>] btrfs_mount+0x53a/0x7d0 [btrfs]
        [<ffffffff8113ab0b>] ? pcpu_alloc+0x8eb/0x9f0
        [<ffffffff81167305>] ? __kmalloc_track_caller+0x35/0x1e0
        [<ffffffff81176ba0>] mount_fs+0x20/0xd0
        [<ffffffff81191096>] vfs_kern_mount+0x76/0x120
        [<ffffffff81193320>] do_mount+0x200/0xa40
        [<ffffffff81135cdb>] ? strndup_user+0x5b/0x80
        [<ffffffff81193bf0>] SyS_mount+0x90/0xe0
        [<ffffffff8156d31d>] system_call_fastpath+0x1a/0x1f
       Code: 4c 8d 75 a8 4c 89 6d e8 45 89 e0 4c 8d 6f 30 48 89 5d d8 41 83 e0 af 48
      89 fb 49 83 c6 18 4c 89 7d f8 65 4c 8b 3c 25 c0 b8 00 00 <48> 8b 73 18 44 89 c7
      44 89 45 98 ff 53 20 48 85 c0 48 89 c2 74
       RIP  [<ffffffff8111e28a>] mempool_alloc+0x4a/0x150
        RSP <ffff880230699688>
       CR2: 0000000000000018
       ---[ end trace 7a96042017ed21e2 ]---
      Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
      Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
      Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
      b208c2f7
  3. 04 Oct, 2013 8 commits
    • Ilya Dryomov's avatar
      Btrfs: fix a use-after-free bug in btrfs_dev_replace_finishing · 1357272f
      Ilya Dryomov authored
      
      
      free_device rcu callback, scheduled from btrfs_rm_dev_replace_srcdev,
      can be processed before btrfs_scratch_superblock is called, which would
      result in a use-after-free on btrfs_device contents.  Fix this by
      zeroing the superblock before the rcu callback is registered.
      
      Cc: Stefan Behrens <sbehrens@giantdisaster.de>
      Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
      Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
      1357272f
    • Ilya Dryomov's avatar
      Btrfs: eliminate races in worker stopping code · 964fb15a
      Ilya Dryomov authored
      
      
      The current implementation of worker threads in Btrfs has races in
      worker stopping code, which cause all kinds of panics and lockups when
      running btrfs/011 xfstest in a loop.  The problem is that
      btrfs_stop_workers is unsynchronized with respect to check_idle_worker,
      check_busy_worker and __btrfs_start_workers.
      
      E.g., check_idle_worker race flow:
      
             btrfs_stop_workers():            check_idle_worker(aworker):
      - grabs the lock
      - splices the idle list into the
        working list
      - removes the first worker from the
        working list
      - releases the lock to wait for
        its kthread's completion
                                        - grabs the lock
                                        - if aworker is on the working list,
                                          moves aworker from the working list
                                          to the idle list
                                        - releases the lock
      - grabs the lock
      - puts the worker
      - removes the second worker from the
        working list
                                    ......
              btrfs_stop_workers returns, aworker is on the idle list
                       FS is umounted, memory is freed
                                    ......
                    aworker is waken up, fireworks ensue
      
      With this applied, I wasn't able to trigger the problem in 48 hours,
      whereas previously I could reliably reproduce at least one of these
      races within an hour.
      Reported-by: default avatarDavid Sterba <dsterba@suse.cz>
      Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
      Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
      964fb15a
    • Liu Bo's avatar
      Btrfs: fix crash of compressed writes · 385fe0be
      Liu Bo authored
      The crash[1] is found by xfstests/generic/208 with "-o compress",
      it's not reproduced everytime, but it does panic.
      
      The bug is quite interesting, it's actually introduced by a recent commit
      (573aecaf
      
      ,
      Btrfs: actually limit the size of delalloc range).
      
      Btrfs implements delay allocation, so during writeback, we
      (1) get a page A and lock it
      (2) search the state tree for delalloc bytes and lock all pages within the range
      (3) process the delalloc range, including find disk space and create
          ordered extent and so on.
      (4) submit the page A.
      
      It runs well in normal cases, but if we're in a racy case, eg.
      buffered compressed writes and aio-dio writes,
      sometimes we may fail to lock all pages in the 'delalloc' range,
      in which case, we need to fall back to search the state tree again with
      a smaller range limit(max_bytes = PAGE_CACHE_SIZE - offset).
      
      The mentioned commit has a side effect, that is, in the fallback case,
      we can find delalloc bytes before the index of the page we already have locked,
      so we're in the case of (delalloc_end <= *start) and return with (found > 0).
      
      This ends with not locking delalloc pages but making ->writepage still
      process them, and the crash happens.
      
      This fixes it by just thinking that we find nothing and returning to caller
      as the caller knows how to deal with it properly.
      
      [1]:
      ------------[ cut here ]------------
      kernel BUG at mm/page-writeback.c:2170!
      [...]
      CPU: 2 PID: 11755 Comm: btrfs-delalloc- Tainted: G           O 3.11.0+ #8
      [...]
      RIP: 0010:[<ffffffff810f5093>]  [<ffffffff810f5093>] clear_page_dirty_for_io+0x1e/0x83
      [...]
      [ 4934.248731] Stack:
      [ 4934.248731]  ffff8801477e5dc8 ffffea00049b9f00 ffff8801869f9ce8 ffffffffa02b841a
      [ 4934.248731]  0000000000000000 0000000000000000 0000000000000fff 0000000000000620
      [ 4934.248731]  ffff88018db59c78 ffffea0005da8d40 ffffffffa02ff860 00000001810016c0
      [ 4934.248731] Call Trace:
      [ 4934.248731]  [<ffffffffa02b841a>] extent_range_clear_dirty_for_io+0xcf/0xf5 [btrfs]
      [ 4934.248731]  [<ffffffffa02a8889>] compress_file_range+0x1dc/0x4cb [btrfs]
      [ 4934.248731]  [<ffffffff8104f7af>] ? detach_if_pending+0x22/0x4b
      [ 4934.248731]  [<ffffffffa02a8bad>] async_cow_start+0x35/0x53 [btrfs]
      [ 4934.248731]  [<ffffffffa02c694b>] worker_loop+0x14b/0x48c [btrfs]
      [ 4934.248731]  [<ffffffffa02c6800>] ? btrfs_queue_worker+0x25c/0x25c [btrfs]
      [ 4934.248731]  [<ffffffff810608f5>] kthread+0x8d/0x95
      [ 4934.248731]  [<ffffffff81060868>] ? kthread_freezable_should_stop+0x43/0x43
      [ 4934.248731]  [<ffffffff814fe09c>] ret_from_fork+0x7c/0xb0
      [ 4934.248731]  [<ffffffff81060868>] ? kthread_freezable_should_stop+0x43/0x43
      [ 4934.248731] Code: ff 85 c0 0f 94 c0 0f b6 c0 59 5b 5d c3 0f 1f 44 00 00 55 48 89 e5 41 54 53 48 89 fb e8 2c de 00 00 49 89 c4 48 8b 03 a8 01 75 02 <0f> 0b 4d 85 e4 74 52 49 8b 84 24 80 00 00 00 f6 40 20 01 75 44
      [ 4934.248731] RIP  [<ffffffff810f5093>] clear_page_dirty_for_io+0x1e/0x83
      [ 4934.248731]  RSP <ffff8801869f9c48>
      [ 4934.280307] ---[ end trace 36f06d3f8750236a ]---
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
      385fe0be
    • Josef Bacik's avatar
      Btrfs: fix transid verify errors when recovering log tree · 60e7cd3a
      Josef Bacik authored
      
      
      If we crash with a log, remount and recover that log, and then crash before we
      can commit another transaction we will get transid verify errors on the next
      mount.  This is because we were not zero'ing out the log when we committed the
      transaction after recovery.  This is ok as long as we commit another transaction
      at some point in the future, but if you abort or something else goes wrong you
      can end up in this weird state because the recovery stuff says that the tree log
      should have a generation+1 of the super generation, which won't be the case of
      the transaction that was started for recovery.  Fix this by removing the check
      and _always_ zero out the log portion of the super when we commit a transaction.
      This fixes the transid verify issues I was seeing with my force errors tests.
      Thanks,
      Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
      60e7cd3a
    • Thierry Reding's avatar
      xfs: Use kmem_free() instead of free() · b2a42f78
      Thierry Reding authored
      
      
      This fixes a build failure caused by calling the free() function which
      does not exist in the Linux kernel.
      Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
      Reviewed-by: default avatarMark Tinguely <tinguely@sgi.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      (cherry picked from commit aaaae980)
      b2a42f78
    • tinguely@sgi.com's avatar
      xfs: fix memory leak in xlog_recover_add_to_trans · 9b3b77fe
      tinguely@sgi.com authored
      
      
      Free the memory in error path of xlog_recover_add_to_trans().
      Normally this memory is freed in recovery pass2, but is leaked
      in the error path.
      Signed-off-by: default avatarMark Tinguely <tinguely@sgi.com>
      Reviewed-by: default avatarEric Sandeen <sandeen@redhat.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      (cherry picked from commit 519ccb81)
      9b3b77fe
    • Dave Chinner's avatar
      xfs: dirent dtype presence is dependent on directory magic numbers · 6d313498
      Dave Chinner authored
      
      
      The determination of whether a directory entry contains a dtype
      field originally was dependent on the filesystem having CRCs
      enabled. This meant that the format for dtype beign enabled could be
      determined by checking the directory block magic number rather than
      doing a feature bit check. This was useful in that it meant that we
      didn't need to pass a struct xfs_mount around to functions that
      were already supplied with a directory block header.
      
      Unfortunately, the introduction of dtype fields into the v4
      structure via a feature bit meant this "use the directory block
      magic number" method of discriminating the dirent entry sizes is
      broken. Hence we need to convert the places that use magic number
      checks to use feature bit checks so that they work correctly and not
      by chance.
      
      The current code works on v4 filesystems only because the dirent
      size roundup covers the extra byte needed by the dtype field in the
      places where this problem occurs.
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Reviewed-by: default avatarBen Myers <bpm@sgi.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      (cherry picked from commit 367993e7)
      6d313498
    • Dave Chinner's avatar
      xfs: lockdep needs to know about 3 dquot-deep nesting · 89c6c89a
      Dave Chinner authored
      
      
      Michael Semon reported that xfs/299 generated this lockdep warning:
      
      =============================================
      [ INFO: possible recursive locking detected ]
      3.12.0-rc2+ #2 Not tainted
      ---------------------------------------------
      touch/21072 is trying to acquire lock:
       (&xfs_dquot_other_class){+.+...}, at: [<c12902fb>] xfs_trans_dqlockedjoin+0x57/0x64
      
      but task is already holding lock:
       (&xfs_dquot_other_class){+.+...}, at: [<c12902fb>] xfs_trans_dqlockedjoin+0x57/0x64
      
      other info that might help us debug this:
       Possible unsafe locking scenario:
      
             CPU0
             ----
        lock(&xfs_dquot_other_class);
        lock(&xfs_dquot_other_class);
      
       *** DEADLOCK ***
      
       May be due to missing lock nesting notation
      
      7 locks held by touch/21072:
       #0:  (sb_writers#10){++++.+}, at: [<c11185b6>] mnt_want_write+0x1e/0x3e
       #1:  (&type->i_mutex_dir_key#4){+.+.+.}, at: [<c11078ee>] do_last+0x245/0xe40
       #2:  (sb_internal#2){++++.+}, at: [<c122c9e0>] xfs_trans_alloc+0x1f/0x35
       #3:  (&(&ip->i_lock)->mr_lock/1){+.+...}, at: [<c126cd1b>] xfs_ilock+0x100/0x1f1
       #4:  (&(&ip->i_lock)->mr_lock){++++-.}, at: [<c126cf52>] xfs_ilock_nowait+0x105/0x22f
       #5:  (&dqp->q_qlock){+.+...}, at: [<c12902fb>] xfs_trans_dqlockedjoin+0x57/0x64
       #6:  (&xfs_dquot_other_class){+.+...}, at: [<c12902fb>] xfs_trans_dqlockedjoin+0x57/0x64
      
      The lockdep annotation for dquot lock nesting only understands
      locking for user and "other" dquots, not user, group and quota
      dquots. Fix the annotations to match the locking heirarchy we now
      have.
      Reported-by: default avatarMichael L. Semon <mlsemon35@gmail.com>
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Reviewed-by: default avatarBen Myers <bpm@sgi.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      (cherry picked from commit f112a049)
      89c6c89a
  4. 01 Oct, 2013 4 commits
  5. 30 Sep, 2013 5 commits
    • Vyacheslav Dubeyko's avatar
      nilfs2: fix issue with race condition of competition between segments for dirty blocks · 7f42ec39
      Vyacheslav Dubeyko authored
      
      
      Many NILFS2 users were reported about strange file system corruption
      (for example):
      
         NILFS: bad btree node (blocknr=185027): level = 0, flags = 0x0, nchildren = 768
         NILFS error (device sda4): nilfs_bmap_last_key: broken bmap (inode number=11540)
      
      But such error messages are consequence of file system's issue that takes
      place more earlier.  Fortunately, Jerome Poulin <jeromepoulin@gmail.com>
      and Anton Eliasson <devel@antoneliasson.se> were reported about another
      issue not so recently.  These reports describe the issue with segctor
      thread's crash:
      
        BUG: unable to handle kernel paging request at 0000000000004c83
        IP: nilfs_end_page_io+0x12/0xd0 [nilfs2]
      
        Call Trace:
         nilfs_segctor_do_construct+0xf25/0x1b20 [nilfs2]
         nilfs_segctor_construct+0x17b/0x290 [nilfs2]
         nilfs_segctor_thread+0x122/0x3b0 [nilfs2]
         kthread+0xc0/0xd0
         ret_from_fork+0x7c/0xb0
      
      These two issues have one reason.  This reason can raise third issue
      too.  Third issue results in hanging of segctor thread with eating of
      100% CPU.
      
      REPRODUCING PATH:
      
      One of the possible way or the issue reproducing was described by
      Jermoe me Poulin <jeromepoulin@gmail.com>:
      
      1. init S to get to single user mode.
      2. sysrq+E to make sure only my shell is running
      3. start network-manager to get my wifi connection up
      4. login as root and launch "screen"
      5. cd /boot/log/nilfs which is a ext3 mount point and can log when NILFS dies.
      6. lscp | xz -9e > lscp.txt.xz
      7. mount my snapshot using mount -o cp=3360839,ro /dev/vgUbuntu/root /mnt/nilfs
      8. start a screen to dump /proc/kmsg to text file since rsyslog is killed
      9. start a screen and launch strace -f -o find-cat.log -t find
      /mnt/nilfs -type f -exec cat {} > /dev/null \;
      10. start a screen and launch strace -f -o apt-get.log -t apt-get update
      11. launch the last command again as it did not crash the first time
      12. apt-get crashes
      13. ps aux > ps-aux-crashed.log
      13. sysrq+W
      14. sysrq+E  wait for everything to terminate
      15. sysrq+SUSB
      
      Simplified way of the issue reproducing is starting kernel compilation
      task and "apt-get update" in parallel.
      
      REPRODUCIBILITY:
      
      The issue is reproduced not stable [60% - 80%].  It is very important to
      have proper environment for the issue reproducing.  The critical
      conditions for successful reproducing:
      
      (1) It should have big modified file by mmap() way.
      
      (2) This file should have the count of dirty blocks are greater that
          several segments in size (for example, two or three) from time to time
          during processing.
      
      (3) It should be intensive background activity of files modification
          in another thread.
      
      INVESTIGATION:
      
      First of all, it is possible to see that the reason of crash is not valid
      page address:
      
        NILFS [nilfs_segctor_complete_write]:2100 bh->b_count 0, bh->b_blocknr 13895680, bh->b_size 13897727, bh->b_page 0000000000001a82
        NILFS [nilfs_segctor_complete_write]:2101 segbuf->sb_segnum 6783
      
      Moreover, value of b_page (0x1a82) is 6786.  This value looks like segment
      number.  And b_blocknr with b_size values look like block numbers.  So,
      buffer_head's pointer points on not proper address value.
      
      Detailed investigation of the issue is discovered such picture:
      
        [-----------------------------SEGMENT 6783-------------------------------]
        NILFS [nilfs_segctor_do_construct]:2310 nilfs_segctor_begin_construction
        NILFS [nilfs_segctor_do_construct]:2321 nilfs_segctor_collect
        NILFS [nilfs_segctor_do_construct]:2336 nilfs_segctor_assign
        NILFS [nilfs_segctor_do_construct]:2367 nilfs_segctor_update_segusage
        NILFS [nilfs_segctor_do_construct]:2371 nilfs_segctor_prepare_write
        NILFS [nilfs_segctor_do_construct]:2376 nilfs_add_checksums_on_logs
        NILFS [nilfs_segctor_do_construct]:2381 nilfs_segctor_write
        NILFS [nilfs_segbuf_submit_bio]:464 bio->bi_sector 111149024, segbuf->sb_segnum 6783
      
        [-----------------------------SEGMENT 6784-------------------------------]
        NILFS [nilfs_segctor_do_construct]:2310 nilfs_segctor_begin_construction
        NILFS [nilfs_segctor_do_construct]:2321 nilfs_segctor_collect
        NILFS [nilfs_lookup_dirty_data_buffers]:782 bh->b_count 1, bh->b_page ffffea000709b000, page->index 0, i_ino 1033103, i_size 25165824
        NILFS [nilfs_lookup_dirty_data_buffers]:783 bh->b_assoc_buffers.next ffff8802174a6798, bh->b_assoc_buffers.prev ffff880221cffee8
        NILFS [nilfs_segctor_do_construct]:2336 nilfs_segctor_assign
        NILFS [nilfs_segctor_do_construct]:2367 nilfs_segctor_update_segusage
        NILFS [nilfs_segctor_do_construct]:2371 nilfs_segctor_prepare_write
        NILFS [nilfs_segctor_do_construct]:2376 nilfs_add_checksums_on_logs
        NILFS [nilfs_segctor_do_construct]:2381 nilfs_segctor_write
        NILFS [nilfs_segbuf_submit_bh]:575 bh->b_count 1, bh->b_page ffffea000709b000, page->index 0, i_ino 1033103, i_size 25165824
        NILFS [nilfs_segbuf_submit_bh]:576 segbuf->sb_segnum 6784
        NILFS [nilfs_segbuf_submit_bh]:577 bh->b_assoc_buffers.next ffff880218a0d5f8, bh->b_assoc_buffers.prev ffff880218bcdf50
        NILFS [nilfs_segbuf_submit_bio]:464 bio->bi_sector 111150080, segbuf->sb_segnum 6784, segbuf->sb_nbio 0
        [----------] ditto
        NILFS [nilfs_segbuf_submit_bio]:464 bio->bi_sector 111164416, segbuf->sb_segnum 6784, segbuf->sb_nbio 15
      
        [-----------------------------SEGMENT 6785-------------------------------]
        NILFS [nilfs_segctor_do_construct]:2310 nilfs_segctor_begin_construction
        NILFS [nilfs_segctor_do_construct]:2321 nilfs_segctor_collect
        NILFS [nilfs_lookup_dirty_data_buffers]:782 bh->b_count 2, bh->b_page ffffea000709b000, page->index 0, i_ino 1033103, i_size 25165824
        NILFS [nilfs_lookup_dirty_data_buffers]:783 bh->b_assoc_buffers.next ffff880219277e80, bh->b_assoc_buffers.prev ffff880221cffc88
        NILFS [nilfs_segctor_do_construct]:2367 nilfs_segctor_update_segusage
        NILFS [nilfs_segctor_do_construct]:2371 nilfs_segctor_prepare_write
        NILFS [nilfs_segctor_do_construct]:2376 nilfs_add_checksums_on_logs
        NILFS [nilfs_segctor_do_construct]:2381 nilfs_segctor_write
        NILFS [nilfs_segbuf_submit_bh]:575 bh->b_count 2, bh->b_page ffffea000709b000, page->index 0, i_ino 1033103, i_size 25165824
        NILFS [nilfs_segbuf_submit_bh]:576 segbuf->sb_segnum 6785
        NILFS [nilfs_segbuf_submit_bh]:577 bh->b_assoc_buffers.next ffff880218a0d5f8, bh->b_assoc_buffers.prev ffff880222cc7ee8
        NILFS [nilfs_segbuf_submit_bio]:464 bio->bi_sector 111165440, segbuf->sb_segnum 6785, segbuf->sb_nbio 0
        [----------] ditto
        NILFS [nilfs_segbuf_submit_bio]:464 bio->bi_sector 111177728, segbuf->sb_segnum 6785, segbuf->sb_nbio 12
      
        NILFS [nilfs_segctor_do_construct]:2399 nilfs_segctor_wait
        NILFS [nilfs_segbuf_wait]:676 segbuf->sb_segnum 6783
        NILFS [nilfs_segbuf_wait]:676 segbuf->sb_segnum 6784
        NILFS [nilfs_segbuf_wait]:676 segbuf->sb_segnum 6785
      
        NILFS [nilfs_segctor_complete_write]:2100 bh->b_count 0, bh->b_blocknr 13895680, bh->b_size 13897727, bh->b_page 0000000000001a82
      
        BUG: unable to handle kernel paging request at 0000000000001a82
        IP: [<ffffffffa024d0f2>] nilfs_end_page_io+0x12/0xd0 [nilfs2]
      
      Usually, for every segment we collect dirty files in list.  Then, dirty
      blocks are gathered for every dirty file, prepared for write and
      submitted by means of nilfs_segbuf_submit_bh() call.  Finally, it takes
      place complete write phase after calling nilfs_end_bio_write() on the
      block layer.  Buffers/pages are marked as not dirty on final phase and
      processed files removed from the list of dirty files.
      
      It is possible to see that we had three prepare_write and submit_bio
      phases before segbuf_wait and complete_write phase.  Moreover, segments
      compete between each other for dirty blocks because on every iteration
      of segments processing dirty buffer_heads are added in several lists of
      payload_buffers:
      
        [SEGMENT 6784]: bh->b_assoc_buffers.next ffff880218a0d5f8, bh->b_assoc_buffers.prev ffff880218bcdf50
        [SEGMENT 6785]: bh->b_assoc_buffers.next ffff880218a0d5f8, bh->b_assoc_buffers.prev ffff880222cc7ee8
      
      The next pointer is the same but prev pointer has changed.  It means
      that buffer_head has next pointer from one list but prev pointer from
      another.  Such modification can be made several times.  And, finally, it
      can be resulted in various issues: (1) segctor hanging, (2) segctor
      crashing, (3) file system metadata corruption.
      
      FIX:
      This patch adds:
      
      (1) setting of BH_Async_Write flag in nilfs_segctor_prepare_write()
          for every proccessed dirty block;
      
      (2) checking of BH_Async_Write flag in
          nilfs_lookup_dirty_data_buffers() and
          nilfs_lookup_dirty_node_buffers();
      
      (3) clearing of BH_Async_Write flag in nilfs_segctor_complete_write(),
          nilfs_abort_logs(), nilfs_forget_buffer(), nilfs_clear_dirty_page().
      Reported-by: default avatarJerome Poulin <jeromepoulin@gmail.com>
      Reported-by: default avatarAnton Eliasson <devel@antoneliasson.se>
      Cc: Paul Fertser <fercerpav@gmail.com>
      Cc: ARAI Shun-ichi <hermes@ceres.dti.ne.jp>
      Cc: Piotr Szymaniak <szarpaj@grubelek.pl>
      Cc: Juan Barry Manuel Canham <Linux@riotingpacifist.net>
      Cc: Zahid Chowdhury <zahid.chowdhury@starsolutions.com>
      Cc: Elmer Zhang <freeboy6716@gmail.com>
      Cc: Kenneth Langga <klangga@gmail.com>
      Signed-off-by: default avatarVyacheslav Dubeyko <slava@dubeyko.com>
      Acked-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7f42ec39
    • Dan Aloni's avatar
      fs/binfmt_elf.c: prevent a coredump with a large vm_map_count from Oopsing · 72023656
      Dan Aloni authored
      A high setting of max_map_count, and a process core-dumping with a large
      enough vm_map_count could result in an NT_FILE note not being written,
      and the kernel crashing immediately later because it has assumed
      otherwise.
      
      Reproduction of the oops-causing bug described here:
      
          https://lkml.org/lkml/2013/8/30/50
      
      Rge ussue originated in commit 2aa362c4
      
       ("coredump: extend core dump
      note section to contain file names of mapped file") from Oct 4, 2012.
      
      This patch make that section optional in that case.  fill_files_note()
      should signify the error, and also let the info struct in
      elf_core_dump() be zero-initialized so that we can check for the
      optionally written note.
      
      [akpm@linux-foundation.org: avoid abusing E2BIG, remove a couple of not-really-needed local variables]
      [akpm@linux-foundation.org: fix sparse warning]
      Signed-off-by: default avatarDan Aloni <alonid@stratoscale.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Denys Vlasenko <vda.linux@googlemail.com>
      Reported-by: default avatarMartin MOKREJS <mmokrejs@gmail.com>
      Tested-by: default avatarMartin MOKREJS <mmokrejs@gmail.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      72023656
    • Al Viro's avatar
      13f35838
    • Al Viro's avatar
    • Lubomir Rintel's avatar
      sysv: Add forgotten superblock lock init for v7 fs · 49475555
      Lubomir Rintel authored
      Superblock lock was replaced with (un)lock_super() removal, but left
      uninitialized for Seventh Edition UNIX filesystem in the following commit (3.7):
      c07cb01c
      
       sysv: drop lock/unlock super
      Signed-off-by: default avatarLubomir Rintel <lkundrak@v3.sk>
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      49475555
  6. 29 Sep, 2013 4 commits
  7. 27 Sep, 2013 1 commit
  8. 26 Sep, 2013 3 commits
    • Mark Tinguely's avatar
      xfs: fix node forward in xfs_node_toosmall · 997def25
      Mark Tinguely authored
      Commit f5ea1100
      
       cleans up the disk to host conversions for
      node directory entries, but because a variable is reused in
      xfs_node_toosmall() the next node is not correctly found.
      If the original node is small enough (<= 3/8 of the node size),
      this change may incorrectly cause a node collapse when it should
      not. That will cause an assert in xfstest generic/319:
      
         Assertion failed: first <= last && last < BBTOB(bp->b_length),
         file: /root/newest/xfs/fs/xfs/xfs_trans_buf.c, line: 569
      
      Keep the original node header to get the correct forward node.
      
      (When a node is considered for a merge with a sibling, it overwrites the
       sibling pointers of the original incore nodehdr with the sibling's
       pointers.  This leads to loop considering the original node as a merge
       candidate with itself in the second pass, and so it incorrectly
       determines a merge should occur.)
      Signed-off-by: default avatarMark Tinguely <tinguely@sgi.com>
      Reviewed-by: default avatarBen Myers <bpm@sgi.com>
      Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      
      [v3: added Dave Chinner's (slightly modified) suggestion to the commit header,
      	cleaned up whitespace.  -bpm]
      997def25
    • Trond Myklebust's avatar
      NFSv4: Honour the 'opened' parameter in the atomic_open() filesystem method · 5bc2afc2
      Trond Myklebust authored
      
      
      Determine if we've created a new file by examining the directory change
      attribute and/or the O_EXCL flag.
      
      This fixes a regression when doing a non-exclusive create of a new file.
      If the FILE_CREATED flag is not set, the atomic_open() command will
      perform full file access permissions checks instead of just checking
      for MAY_OPEN.
      Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
      5bc2afc2
    • Steve French's avatar
      [CIFS] update cifs.ko version · ffe67b58
      Steve French authored
      
      
      To 2.02
      Signed-off-by: default avatarSteve French <smfrench@gmail.com>
      ffe67b58
  9. 25 Sep, 2013 2 commits