)]}'
{
  "log": [
    {
      "commit": "2aa15890f3c191326678f1bd68af61ec6b8753ec",
      "tree": "347f5fdcd0678b12be92f266cd2a5e7a74749403",
      "parents": [
        "78794b2cdeac37ac1fd950fc9c4454b56d88ac03"
      ],
      "author": {
        "name": "Miklos Szeredi",
        "email": "mszeredi@suse.cz",
        "time": "Wed Feb 23 13:49:47 2011 +0100"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Wed Feb 23 19:52:52 2011 -0800"
      },
      "message": "mm: prevent concurrent unmap_mapping_range() on the same inode\n\nMichael Leun reported that running parallel opens on a fuse filesystem\ncan trigger a \"kernel BUG at mm/truncate.c:475\"\n\nGurudas Pai reported the same bug on NFS.\n\nThe reason is, unmap_mapping_range() is not prepared for more than\none concurrent invocation per inode.  For example:\n\n  thread1: going through a big range, stops in the middle of a vma and\n     stores the restart address in vm_truncate_count.\n\n  thread2: comes in with a small (e.g. single page) unmap request on\n     the same vma, somewhere before restart_address, finds that the\n     vma was already unmapped up to the restart address and happily\n     returns without doing anything.\n\nAnother scenario would be two big unmap requests, both having to\nrestart the unmapping and each one setting vm_truncate_count to its\nown value.  This could go on forever without any of them being able to\nfinish.\n\nTruncate and hole punching already serialize with i_mutex.  Other\ncallers of unmap_mapping_range() do not, and it\u0027s difficult to get\ni_mutex protection for all callers.  In particular -\u003ed_revalidate(),\nwhich calls invalidate_inode_pages2_range() in fuse, may be called\nwith or without i_mutex.\n\nThis patch adds a new mutex to \u0027struct address_space\u0027 to prevent\nrunning multiple concurrent unmap_mapping_range() on the same mapping.\n\n[ We\u0027ll hopefully get rid of all this with the upcoming mm\n  preemptibility series by Peter Zijlstra, the \"mm: Remove i_mmap_mutex\n  lockbreak\" patch in particular.  But that is for 2.6.39 ]\n\nSigned-off-by: Miklos Szeredi \u003cmszeredi@suse.cz\u003e\nReported-by: Michael Leun \u003clkml20101129@newton.leun.net\u003e\nReported-by: Gurudas Pai \u003cgurudas.pai@oracle.com\u003e\nTested-by: Gurudas Pai \u003cgurudas.pai@oracle.com\u003e\nAcked-by: Hugh Dickins \u003chughd@google.com\u003e\nCc: stable@kernel.org\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "26dfdd8e29f28c08aa67861b3c83d0f3f7d30cee",
      "tree": "3cc14a71010b454f6524006e973147837f040a39",
      "parents": [
        "f8e6cc013b896d75d6ce4ec9e168014af1257fd8"
      ],
      "author": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Sun Jul 18 10:42:23 2010 +0900"
      },
      "committer": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Fri Jul 23 10:02:15 2010 +0900"
      },
      "message": "nilfs2: add read ahead mode to nilfs_btnode_submit_block\n\nThis adds mode argument to nilfs_btnode_submit_block() function and\nallows it to issue a read-ahead request.\n\nAn optional submit_ptr argument is also added to store the actual\nblock address for which bio is sent.  submit_ptr is used for a series\nof read-ahead requests, and helps to decide if each requested block is\ncontinous to the previous one on disk.\n\nSigned-off-by: Ryusuke Konishi \u003ckonishi.ryusuke@lab.ntt.co.jp\u003e\n"
    },
    {
      "commit": "1376e931b75f954057b1547ba25fcba594cef804",
      "tree": "b8e75d8dddb705c661542b534b4a74f9e1e87aa4",
      "parents": [
        "75f65edfcc4a19d14fc8ab860846fad070c8db49"
      ],
      "author": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Fri Nov 13 16:49:09 2009 +0900"
      },
      "committer": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Fri Nov 20 10:05:50 2009 +0900"
      },
      "message": "nilfs2: eliminate nilfs_btnode_get function\n\nThis removes the obsolete nilfs_btnode_get() function and makes\nnilfs_btree_get_block() directly call nilfs_btnode_submit_block().\n\nThis expansion will provide better opportunity for code optimization.\n\nSigned-off-by: Ryusuke Konishi \u003ckonishi.ryusuke@lab.ntt.co.jp\u003e\n"
    },
    {
      "commit": "75f65edfcc4a19d14fc8ab860846fad070c8db49",
      "tree": "e0edfb5767630f95620e5e7b670e0871e1d51e7b",
      "parents": [
        "45f4910bc0bb904bcf53aa04ee1b807abe1387a6"
      ],
      "author": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Fri Nov 13 16:30:41 2009 +0900"
      },
      "committer": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Fri Nov 20 10:05:50 2009 +0900"
      },
      "message": "nilfs2: remove newblk argument from nilfs_btnode_submit_block\n\nThis removes the obsolete argument from nilfs_btnode_submit_block().\nThis will complete separating a create function of btree node.\n\nSigned-off-by: Ryusuke Konishi \u003ckonishi.ryusuke@lab.ntt.co.jp\u003e\n"
    },
    {
      "commit": "d501d7368937740e8d06671a4bfe4e236ed25bd0",
      "tree": "c0abbdc89862cfdb5e85321cbc6f2959af376cd9",
      "parents": [
        "b34a65069caa56b691ebab5ae0b8e54d16406d16"
      ],
      "author": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Fri Nov 13 16:04:11 2009 +0900"
      },
      "committer": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Fri Nov 20 10:05:49 2009 +0900"
      },
      "message": "nilfs2: separate function for creating new btree node block\n\nAdds a separate routine for creating a btree node block.  This is a\npreparation to reduce the depth of function calls during submitting\nbtree node buffer.\n\nSigned-off-by: Ryusuke Konishi \u003ckonishi.ryusuke@lab.ntt.co.jp\u003e\n"
    },
    {
      "commit": "a53b4751ae92adb372017222887f3ec625cba60b",
      "tree": "454c0876bb532ee44ad07485e6d40c60e157ca34",
      "parents": [
        "30c25be71fcbd87fd33518045cc014e69bff3d6f"
      ],
      "author": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Wed May 27 22:11:46 2009 +0900"
      },
      "committer": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Wed Jun 10 23:41:12 2009 +0900"
      },
      "message": "nilfs2: use device\u0027s backing_dev_info for btree node caches\n\nPreviously, default_backing_dev_info was used for the mapping of btree\nnode caches.  This uses device dependent backing_dev_info to allow\ndetailed control of the device for the btree node pages.\n\nSigned-off-by: Ryusuke Konishi \u003ckonishi.ryusuke@lab.ntt.co.jp\u003e\n"
    },
    {
      "commit": "a60be987d45dd510aeb54389526f9957cfab106c",
      "tree": "ffe680785f1f7d4e4096cd211e37bcfeaccafc63",
      "parents": [
        "36a580eb489f54d81a0534974962e732a314b999"
      ],
      "author": {
        "name": "Ryusuke Konishi",
        "email": "konishi.ryusuke@lab.ntt.co.jp",
        "time": "Mon Apr 06 19:01:25 2009 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Tue Apr 07 08:31:13 2009 -0700"
      },
      "message": "nilfs2: B-tree node cache\n\nThis adds routines for B-tree node buffers.\n\nSigned-off-by: Seiji Kihara \u003ckihara.seiji@lab.ntt.co.jp\u003e\nSigned-off-by: Ryusuke Konishi \u003ckonishi.ryusuke@lab.ntt.co.jp\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    }
  ]
}