)]}'
{
  "log": [
    {
      "commit": "f2a97a9dbd86eb1ef956bdf20e05c507b32beb96",
      "tree": "756c2db8fee9c02df0e3217ea208a82b5f1d5e78",
      "parents": [
        "621496f4fd56195b7b273521f467c2945165481f"
      ],
      "author": {
        "name": "David Sterba",
        "email": "dsterba@suse.cz",
        "time": "Thu May 05 12:44:41 2011 +0200"
      },
      "committer": {
        "name": "David Sterba",
        "email": "dsterba@suse.cz",
        "time": "Fri May 06 12:34:03 2011 +0200"
      },
      "message": "btrfs: remove all unused functions\n\nRemove static and global declarations and/or definitions. Reduces size\nof btrfs.ko by ~3.4kB.\n\n  text    data     bss     dec     hex filename\n402081    7464     200  409745   64091 btrfs.ko.base\n398620    7144     200  405964   631cc btrfs.ko.remove-all\n\nSigned-off-by: David Sterba \u003cdsterba@suse.cz\u003e\n"
    },
    {
      "commit": "5a0e3ad6af8660be21ca98a971cd00f331318c05",
      "tree": "5bfb7be11a03176a87296a43ac6647975c00a1d1",
      "parents": [
        "ed391f4ebf8f701d3566423ce8f17e614cde9806"
      ],
      "author": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Wed Mar 24 17:04:11 2010 +0900"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Tue Mar 30 22:02:32 2010 +0900"
      },
      "message": "include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h\n\npercpu.h is included by sched.h and module.h and thus ends up being\nincluded when building most .c files.  percpu.h includes slab.h which\nin turn includes gfp.h making everything defined by the two files\nuniversally available and complicating inclusion dependencies.\n\npercpu.h -\u003e slab.h dependency is about to be removed.  Prepare for\nthis change by updating users of gfp and slab facilities include those\nheaders directly instead of assuming availability.  As this conversion\nneeds to touch large number of source files, the following script is\nused as the basis of conversion.\n\n  http://userweb.kernel.org/~tj/misc/slabh-sweep.py\n\nThe script does the followings.\n\n* Scan files for gfp and slab usages and update includes such that\n  only the necessary includes are there.  ie. if only gfp is used,\n  gfp.h, if slab is used, slab.h.\n\n* When the script inserts a new include, it looks at the include\n  blocks and try to put the new include such that its order conforms\n  to its surrounding.  It\u0027s put in the include block which contains\n  core kernel includes, in the same order that the rest are ordered -\n  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there\n  doesn\u0027t seem to be any matching order.\n\n* If the script can\u0027t find a place to put a new include (mostly\n  because the file doesn\u0027t have fitting include block), it prints out\n  an error message indicating which .h file needs to be added to the\n  file.\n\nThe conversion was done in the following steps.\n\n1. The initial automatic conversion of all .c files updated slightly\n   over 4000 files, deleting around 700 includes and adding ~480 gfp.h\n   and ~3000 slab.h inclusions.  The script emitted errors for ~400\n   files.\n\n2. Each error was manually checked.  Some didn\u0027t need the inclusion,\n   some needed manual addition while adding it to implementation .h or\n   embedding .c file was more appropriate for others.  This step added\n   inclusions to around 150 files.\n\n3. The script was run again and the output was compared to the edits\n   from #2 to make sure no file was left behind.\n\n4. Several build tests were done and a couple of problems were fixed.\n   e.g. lib/decompress_*.c used malloc/free() wrappers around slab\n   APIs requiring slab.h to be added manually.\n\n5. The script was run on all .h files but without automatically\n   editing them as sprinkling gfp.h and slab.h inclusions around .h\n   files could easily lead to inclusion dependency hell.  Most gfp.h\n   inclusion directives were ignored as stuff from gfp.h was usually\n   wildly available and often used in preprocessor macros.  Each\n   slab.h inclusion directive was examined and added manually as\n   necessary.\n\n6. percpu.h was updated not to include slab.h.\n\n7. Build test were done on the following configurations and failures\n   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my\n   distributed build env didn\u0027t work with gcov compiles) and a few\n   more options had to be turned off depending on archs to make things\n   build (like ipr on powerpc/64 which failed due to missing writeq).\n\n   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.\n   * powerpc and powerpc64 SMP allmodconfig\n   * sparc and sparc64 SMP allmodconfig\n   * ia64 SMP allmodconfig\n   * s390 SMP allmodconfig\n   * alpha SMP allmodconfig\n   * um on x86_64 SMP allmodconfig\n\n8. percpu.h modifications were reverted so that it could be applied as\n   a separate patch and serve as bisection point.\n\nGiven the fact that I had only a couple of failures from tests on step\n6, I\u0027m fairly confident about the coverage of this conversion patch.\nIf there is a breakage, it\u0027s likely to be something in one of the arch\nheaders which should be easily discoverable easily on most builds of\nthe specific arch.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nGuess-its-ok-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Ingo Molnar \u003cmingo@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\n"
    },
    {
      "commit": "bd56b30205bc09da0beb80d4ba3d4c7309792da5",
      "tree": "a5cb3104687b27e923b73b2840f053abc1229a92",
      "parents": [
        "b4ce94de9b4d64e8ab3cf155d13653c666e22b9b"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Wed Feb 04 09:27:02 2009 -0500"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Wed Feb 04 09:27:02 2009 -0500"
      },
      "message": "Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks\n\nEvery transaction in btrfs creates a new snapshot, and then schedules the\nsnapshot from the last transaction for deletion.  Snapshot deletion\nworks by walking down the btree and dropping the reference counts\non each btree block during the walk.\n\nIf if a given leaf or node has a reference count greater than one,\nthe reference count is decremented and the subtree pointed to by that\nnode is ignored.\n\nIf the reference count is one, walking continues down into that node\nor leaf, and the references of everything it points to are decremented.\n\nThe old code would try to work in small pieces, walking down the tree\nuntil it found the lowest leaf or node to free and then returning.  This\nwas very friendly to the rest of the FS because it didn\u0027t have a huge\nimpact on other operations.\n\nBut it wouldn\u0027t always keep up with the rate that new commits added new\nsnapshots for deletion, and it wasn\u0027t very optimal for the extent\nallocation tree because it wasn\u0027t finding leaves that were close together\non disk and processing them at the same time.\n\nThis changes things to walk down to a level 1 node and then process it\nin bulk.  All the leaf pointers are sorted and the leaves are dropped\nin order based on their extent number.\n\nThe extent allocation tree and commit code are now fast enough for\nthis kind of bulk processing to work without slowing the rest of the FS\ndown.  Overall it does less IO and is better able to keep up with\nsnapshot deletions under high load.\n\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": "d352ac68148b69937d39ca5d48bcc4478e118dbf",
      "tree": "7951dd7311999d9e77766acdc7f8e93de97874d8",
      "parents": [
        "9a5e1ea1e1e539e244a54afffc330fc368376ab9"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Mon Sep 29 15:18:18 2008 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Mon Sep 29 15:18:18 2008 -0400"
      },
      "message": "Btrfs: add and improve comments\n\nThis improves the comments at the top of many functions.  It didn\u0027t\ndive into the guts of functions because I was trying to\navoid merging problems with the new allocator and back reference work.\n\nextent-tree.c and volumes.c were both skipped, and there is definitely\nmore work todo in cleaning and commenting the code.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    },
    {
      "commit": "9a5e1ea1e1e539e244a54afffc330fc368376ab9",
      "tree": "87b48444ba411ff6d87a87190faf5a3d912765d1",
      "parents": [
        "8c8bee1d7ca47fc75b6bd24a8085c525a2394c02"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Mon Sep 29 11:24:41 2008 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Mon Sep 29 11:24:41 2008 -0400"
      },
      "message": "Btrfs: drop WARN_ON from btrfs_add_leaf_ref\n\nbtrfs_add_leaf_ref was doing checks on the objects it found in the\nrbtree to make sure they were properly linked into the tree.  But, the field\nit was checking can be safely changed outside of the tree spin lock.\n\nThe WARN_ON was for debugging the initial implementation and can be\nsafely removed.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n\n"
    },
    {
      "commit": "e465768938f95388723b0fd3c50a0ae48173edb9",
      "tree": "0f624a9a98dedfafae902e12b384d27e1100cd3a",
      "parents": [
        "e8569813849b5da394a195c7e76b4faa452b12d1"
      ],
      "author": {
        "name": "Zheng Yan",
        "email": "zheng.yan@oracle.com",
        "time": "Fri Sep 26 10:04:53 2008 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Fri Sep 26 10:04:53 2008 -0400"
      },
      "message": "Btrfs: Add shared reference cache\n\nBtrfs has a cache of reference counts in leaves, allowing it to\navoid reading tree leaves while deleting snapshots.  To reduce\ncontention with multiple subvolumes, this cache is private to each\nsubvolume.\n\nThis patch adds shared reference cache support. The new space\nbalancing code plays with multiple subvols at the same time, So\nthe old per-subvol reference cache is not well suited.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    },
    {
      "commit": "bcc63abbf3e9bf948a1b0129b3e6120ec7d7f698",
      "tree": "1c66dc210f948f79c86786368d2c75b57482875d",
      "parents": [
        "33958dc6d38fb4ca7e62273855fcb2db7e616263"
      ],
      "author": {
        "name": "Yan",
        "email": "zheng.yan@oracle.com",
        "time": "Wed Jul 30 16:29:20 2008 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Thu Sep 25 11:04:05 2008 -0400"
      },
      "message": "Btrfs: implement memory reclaim for leaf reference cache\n\nThe memory reclaiming issue happens when snapshot exists. In that\ncase, some cache entries may not be used during old snapshot dropping,\nso they will remain in the cache until umount.\n\nThe patch adds a field to struct btrfs_leaf_ref to record create time. Besides,\nthe patch makes all dead roots of a given snapshot linked together in order of\ncreate time. After a old snapshot was completely dropped, we check the dead\nroot list and remove all cache entries created before the oldest dead root in\nthe list.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    },
    {
      "commit": "017e5369eb353559d68a11d4a718faa634533821",
      "tree": "c339f2f4a59e403c7f9bfa8d137663c6bf260537",
      "parents": [
        "31153d81284934601d08110ac7698fd9a535e4c0"
      ],
      "author": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Mon Jul 28 15:32:51 2008 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Thu Sep 25 11:04:05 2008 -0400"
      },
      "message": "Btrfs: Leaf reference cache update\n\nThis changes the reference cache to make a single cache per root\ninstead of one cache per transaction, and to key by the byte number\nof the disk block instead of the keys inside.\n\nThis makes it much less likely to have cache misses if a snapshot\nor something has an extra reference on a higher node or a leaf while\nthe first transaction that added the leaf into the cache is dropping.\n\nSome throttling is added to functions that free blocks heavily so they\nwait for old transactions to drop.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    },
    {
      "commit": "31153d81284934601d08110ac7698fd9a535e4c0",
      "tree": "38f873fea3012a58d2a8f4d439a9546443617878",
      "parents": [
        "3a115f520f391b4ab14041bdd6eedb370d944fa6"
      ],
      "author": {
        "name": "Yan Zheng",
        "email": "zheng.yan@oracle.com",
        "time": "Mon Jul 28 15:32:19 2008 -0400"
      },
      "committer": {
        "name": "Chris Mason",
        "email": "chris.mason@oracle.com",
        "time": "Thu Sep 25 11:04:05 2008 -0400"
      },
      "message": "Btrfs: Add a leaf reference cache\n\nMuch of the IO done while dropping snapshots is done looking up\nleaves in the filesystem trees to see if they point to any extents and\nto drop the references on any extents found.\n\nThis creates a cache so that IO isn\u0027t required.\n\nSigned-off-by: Chris Mason \u003cchris.mason@oracle.com\u003e\n"
    }
  ]
}