)]}'
{
  "log": [
    {
      "commit": "7ac687d9e047b3fa335f04e18c7188db6a170334",
      "tree": "5f17ea504a2185070b75076ea0108d88b96309c3",
      "parents": [
        "e8e3c3d66fd9d1ee2250f68d778cc48c1346d228"
      ],
      "author": {
        "name": "Cong Wang",
        "email": "amwang@redhat.com",
        "time": "Fri Nov 25 23:14:28 2011 +0800"
      },
      "committer": {
        "name": "Cong Wang",
        "email": "xiyou.wangcong@gmail.com",
        "time": "Tue Mar 20 21:48:21 2012 +0800"
      },
      "message": "btrfs: remove the second argument of k[un]map_atomic()\n\nSigned-off-by: Cong Wang \u003camwang@redhat.com\u003e\n"
    },
    {
      "commit": "565d76cb7d5fd7cb010fd690602280a69ab116ef",
      "tree": "beff4279da00976e10145820c22e699192056973",
      "parents": [
        "b12d12596992f608f5506a8dabe4d1299594bd1e"
      ],
      "author": {
        "name": "Jim Keniston",
        "email": "jkenisto@linux.vnet.ibm.com",
        "time": "Tue Mar 22 16:35:12 2011 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Tue Mar 22 17:44:17 2011 -0700"
      },
      "message": "zlib: slim down zlib_deflate() workspace when possible\n\nInstead of always creating a huge (268K) deflate_workspace with the\nmaximum compression parameters (windowBits\u003d15, memLevel\u003d8), allow the\ncaller to obtain a smaller workspace by specifying smaller parameter\nvalues.\n\nFor example, when capturing oops and panic reports to a medium with\nlimited capacity, such as NVRAM, compression may be the only way to\ncapture the whole report.  In this case, a small workspace (24K works\nfine) is a win, whether you allocate the workspace when you need it (i.e.,\nduring an oops or panic) or at boot time.\n\nI\u0027ve verified that this patch works with all accepted values of windowBits\n(positive and negative), memLevel, and compression level.\n\nSigned-off-by: Jim Keniston \u003cjkenisto@us.ibm.com\u003e\nCc: Herbert Xu \u003cherbert@gondor.apana.org.au\u003e\nCc: David Miller \u003cdavem@davemloft.net\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "3a39c18d63fec35f49df577d4b2a4e29c2212f22",
      "tree": "78b8c032e18e2231c18e89ac3f8f5746abdb119c",
      "parents": [
        "1a419d85a76853d7d04e9b6280a80e96770bf3e3"
      ],
      "author": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Mon Nov 08 15:22:19 2010 +0800"
      },
      "committer": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Wed Dec 22 23:15:50 2010 +0800"
      },
      "message": "btrfs: Extract duplicate decompress code\n\nAdd a common function to copy decompressed data from working buffer\nto bio pages.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n"
    },
    {
      "commit": "261507a02ccba9afda919852263b6bc1581ce1ef",
      "tree": "c16bc657ff4e29a87042ceb379487f24dff01035",
      "parents": [
        "4b72029dc3fd6ba7dc45ccd1cf0aa0ebfa209bd3"
      ],
      "author": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Fri Dec 17 14:21:50 2010 +0800"
      },
      "committer": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Wed Dec 22 23:15:45 2010 +0800"
      },
      "message": "btrfs: Allow to add new compression algorithm\n\nMake the code aware of compression type, instead of always assuming\nzlib compression.\n\nAlso make the zlib workspace function as common code for all\ncompression types.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n"
    },
    {
      "commit": "4b72029dc3fd6ba7dc45ccd1cf0aa0ebfa209bd3",
      "tree": "116285c40ed2fa30e91d164e2e16e0d82ae450f9",
      "parents": [
        "8844355df7f4e091b03cc131e1549631238b397b"
      ],
      "author": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Tue Nov 09 08:27:27 2010 +0800"
      },
      "committer": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Wed Dec 22 23:15:43 2010 +0800"
      },
      "message": "btrfs: Fix error handling in zlib\n\nReturn failure if alloc_page() fails to allocate memory,\nand the upper code will just give up compression.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n"
    },
    {
      "commit": "8844355df7f4e091b03cc131e1549631238b397b",
      "tree": "90568648b57f05265def659b7dbf8f45baaaeb65",
      "parents": [
        "83a50de97fe96aca82389e061862ed760ece2283"
      ],
      "author": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Mon Oct 25 15:11:43 2010 +0800"
      },
      "committer": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Wed Dec 22 23:15:41 2010 +0800"
      },
      "message": "btrfs: Fix bugs in zlib workspace\n\n- Fix a race that can result in alloc_workspace \u003e cpus.\n- Fix to check num_workspace after wakeup.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n"
    },
    {
      "commit": "559af8211433b8c0b20e6c43c61409cb9c9c2996",
      "tree": "702ebd4c4f5b610daa36f65d814a518356a9a46b",
      "parents": [
        "411fc6bcef54f828a5458f4730c68abdf13c6bf0"
      ],
      "author": {
        "name": "Andi Kleen",
        "email": "andi@firstfloor.org",
        "time": "Fri Oct 29 15:14:37 2010 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Fri Oct 29 15:14:37 2010 -0400"
      },
      "message": "Btrfs: cleanup warnings from gcc 4.6 (nonbugs)\n\nThese are all the cases where a variable is set, but not read which are\nnot bugs as far as I can see, but simply leftovers.\n\nStill needs more review.\n\nFound by gcc 4.6\u0027s new warnings\n\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    },
    {
      "commit": "60f2e8f8a07331097a57ec4abcdc680405579377",
      "tree": "6ed3c6c8fc2ad4c824c7d2c942fe7d3ece924dc7",
      "parents": [
        "4baf8c9201e88546918cbfa61ea8062c38bc1644"
      ],
      "author": {
        "name": "Julia Lawall",
        "email": "julia@diku.dk",
        "time": "Fri Aug 07 13:51:33 2009 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Fri Aug 07 13:51:33 2009 -0400"
      },
      "message": "Btrfs: correct error-handling zlib error handling\n\nfind_zlib_workspace returns an ERR_PTR value in an error case instead of NULL.\n\nA simplified version of the semantic match that finds this problem is as\nfollows: (http://coccinelle.lip6.fr/)\n\n// \u003csmpl\u003e\n@match exists@\nexpression x, E;\nstatement S1, S2;\n@@\n\nx \u003d find_zlib_workspace(...)\n... when !\u003d x \u003d E\n(\n*  if (x \u003d\u003d NULL || ...) S1 else S2\n|\n*  if (x \u003d\u003d NULL \u0026\u0026 ...) S1 else S2\n)\n// \u003c/smpl\u003e\n\nSigned-off-by: Julia Lawall \u003cjulia@diku.dk\u003e\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    },
    {
      "commit": "d397712bcc6a759a560fd247e6053ecae091f958",
      "tree": "9da8daebb870d8b8b1843507c4621715e23dd31a",
      "parents": [
        "1f3c79a28c8837e8572b98f6d14142d9a6133c56"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Mon Jan 05 21:25:51 2009 -0500"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Mon Jan 05 21:25:51 2009 -0500"
      },
      "message": "Btrfs: Fix checkpatch.pl warnings\n\nThere were many, most are fixed now.  struct-funcs.c generates some warnings\nbut these are bogus.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    },
    {
      "commit": "b2950863c61bc24cf0f63bc05947d9d50663c4c0",
      "tree": "3005a034713fe86db2d64ab1b21fe8762f6a4b0c",
      "parents": [
        "1ffa4f426c002161b7dbd58b297f5d0680e7dd6a"
      ],
      "author": {
        "name": "Christoph Hellwig",
        "email": "hch@lst.de",
        "time": "Tue Dec 02 09:54:17 2008 -0500"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Tue Dec 02 09:54:17 2008 -0500"
      },
      "message": "Btrfs: make things static and include the right headers\n\nShut up various sparse warnings about symbols that should be either\nstatic or have their declarations in scope.\n\nSigned-off-by: Christoph Hellwig \u003chch@lst.de\u003e\n\n"
    },
    {
      "commit": "5b050f04c8ce911c5b6831305a24d70eab95e732",
      "tree": "ebc7be1f9526a75a8d7ac7a7984c20d728ca96d1",
      "parents": [
        "8247b41ac980d125de8aeba6f33f381056ac0ecb"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Tue Nov 11 09:34:41 2008 -0500"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Tue Nov 11 09:34:41 2008 -0500"
      },
      "message": "Btrfs: Fix compile warnings on 32 bit machines\n\nSimple casting here and there to fix things up.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n\n"
    },
    {
      "commit": "771ed689d2cd53439e28e095bc38fbe40a71429e",
      "tree": "518801f7141928e398d40c2b5955720d4346ce1a",
      "parents": [
        "4a69a41009c4ac691f7d9c289f5f37fabeddce46"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Thu Nov 06 22:02:51 2008 -0500"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Thu Nov 06 22:02:51 2008 -0500"
      },
      "message": "Btrfs: Optimize compressed writeback and reads\n\nWhen reading compressed extents, try to put pages into the page cache\nfor any pages covered by the compressed extent that readpages didn\u0027t already\npreload.\n\nAdd an async work queue to handle transformations at delayed allocation processing\ntime.  Right now this is just compression.  The workflow is:\n\n1) Find offsets in the file marked for delayed allocation\n2) Lock the pages\n3) Lock the state bits\n4) Call the async delalloc code\n\nThe async delalloc code clears the state lock bits and delalloc bits.  It is\nimportant this happens before the range goes into the work queue because\notherwise it might deadlock with other work queue items that try to lock\nthose extent bits.\n\nThe file pages are compressed, and if the compression doesn\u0027t work the\npages are written back directly.\n\nAn ordered work queue is used to make sure the inodes are written in the same\norder that pdflush or writepages sent them down.\n\nThis changes extent_write_cache_pages to let the writepage function\nupdate the wbc nr_written count.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n\n"
    },
    {
      "commit": "c8b978188c9a0fd3d535c13debd19d522b726f1f",
      "tree": "873628723fb82fe2a7c77adc65fa93eca1d61c0c",
      "parents": [
        "26ce34a9c47334ff7984769e4661b2f1883594ff"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Wed Oct 29 14:49:59 2008 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Wed Oct 29 14:49:59 2008 -0400"
      },
      "message": "Btrfs: Add zlib compression support\n\nThis is a large change for adding compression on reading and writing,\nboth for inline and regular extents.  It does some fairly large\nsurgery to the writeback paths.\n\nCompression is off by default and enabled by mount -o compress.  Even\nwhen the -o compress mount option is not used, it is possible to read\ncompressed extents off the disk.\n\nIf compression for a given set of pages fails to make them smaller, the\nfile is flagged to avoid future compression attempts later.\n\n* While finding delalloc extents, the pages are locked before being sent down\nto the delalloc handler.  This allows the delalloc handler to do complex things\nsuch as cleaning the pages, marking them writeback and starting IO on their\nbehalf.\n\n* Inline extents are inserted at delalloc time now.  This allows us to compress\nthe data before inserting the inline extent, and it allows us to insert\nan inline extent that spans multiple pages.\n\n* All of the in-memory extent representations (extent_map.c, ordered-data.c etc)\nare changed to record both an in-memory size and an on disk size, as well\nas a flag for compression.\n\nFrom a disk format point of view, the extent pointers in the file are changed\nto record the on disk size of a given extent and some encoding flags.\nSpace in the disk format is allocated for compression encoding, as well\nas encryption and a generic \u0027other\u0027 field.  Neither the encryption or the\n\u0027other\u0027 field are currently used.\n\nIn order to limit the amount of data read for a single random read in the\nfile, the size of a compressed extent is limited to 128k.  This is a\nsoftware only limit, the disk format supports u64 sized compressed extents.\n\nIn order to limit the ram consumed while processing extents, the uncompressed\nsize of a compressed extent is limited to 256k.  This is a software only limit\nand will be subject to tuning later.\n\nChecksumming is still done on compressed extents, and it is done on the\nuncompressed version of the data.  This way additional encodings can be\nlayered on without having to figure out which encoding to checksum.\n\nCompression happens at delalloc time, which is basically singled threaded because\nit is usually done by a single pdflush thread.  This makes it tricky to\nspread the compression load across all the cpus on the box.  We\u0027ll have to\nlook at parallel pdflush walks of dirty inodes at a later time.\n\nDecompression is hooked into readpages and it does spread across CPUs nicely.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    }
  ]
}