)]}'
{
  "log": [
    {
      "commit": "cc8394d86f045b86ff303d3c9e4ce47d97148951",
      "tree": "ad37143c9709f523fb2ca9fc5ac9de75e9a011f9",
      "parents": [
        "a24c25696b7133dd534d7a9436e576af79d9ce3b"
      ],
      "author": {
        "name": "Joe Thornber",
        "email": "ejt@redhat.com",
        "time": "Sun Jun 03 00:30:01 2012 +0100"
      },
      "committer": {
        "name": "Alasdair G Kergon",
        "email": "agk@redhat.com",
        "time": "Sun Jun 03 00:30:01 2012 +0100"
      },
      "message": "dm thin: provide userspace access to pool metadata\n\nThis patch implements two new messages that can be sent to the thin\npool target allowing it to take a snapshot of the _metadata_.  This,\nread-only snapshot can be accessed by userland, concurrently with the\nlive target.\n\nOnly one metadata snapshot can be held at a time.  The pool\u0027s status\nline will give the block location for the current msnap.\n\nSince version 0.1.5 of the userland thin provisioning tools, the\nthin_dump program displays the msnap as follows:\n\n    thin_dump -m \u003cmsnap root\u003e \u003cmetadata dev\u003e\n\nAvailable here: https://github.com/jthornber/thin-provisioning-tools\n\nNow that userland can access the metadata we can do various things\nthat have traditionally been kernel side tasks:\n\n     i) Incremental backups.\n\n     By using metadata snapshots we can work out what blocks have\n     changed over time.  Combined with data snapshots we can ensure\n     the data doesn\u0027t change while we back it up.\n\n     A short proof of concept script can be found here:\n\n     https://github.com/jthornber/thinp-test-suite/blob/master/incremental_backup_example.rb\n\n     ii) Migration of thin devices from one pool to another.\n\n     iii) Merging snapshots back into an external origin.\n\n     iv) Asyncronous replication.\n\nSigned-off-by: Joe Thornber \u003cejt@redhat.com\u003e\nSigned-off-by: Alasdair G Kergon \u003cagk@redhat.com\u003e\n"
    },
    {
      "commit": "67e2e2b281812b5caf4923a38aadc6b89e34f064",
      "tree": "c04255840de5e70a0aa2880d1f1c8bfe1b2e7817",
      "parents": [
        "104655fd4dcebd50068ef30253a001da72e3a081"
      ],
      "author": {
        "name": "Joe Thornber",
        "email": "ejt@redhat.com",
        "time": "Wed Mar 28 18:41:29 2012 +0100"
      },
      "committer": {
        "name": "Alasdair G Kergon",
        "email": "agk@redhat.com",
        "time": "Wed Mar 28 18:41:29 2012 +0100"
      },
      "message": "dm thin: add pool target flags to control discard\n\nAdd dm thin target arguments to control discard support.\n\nignore_discard: Disables discard support\n\nno_discard_passdown: Don\u0027t pass discards down to the underlying data\ndevice, but just remove the mapping within the thin provisioning target.\n\nSigned-off-by: Joe Thornber \u003cejt@redhat.com\u003e\nSigned-off-by: Mike Snitzer \u003csnitzer@redhat.com\u003e\nSigned-off-by: Alasdair G Kergon \u003cagk@redhat.com\u003e\n"
    },
    {
      "commit": "2dd9c257fbc243aa76ee6db0bb8371f9f74fad2d",
      "tree": "51c82de6e41b4f53f9d41dfe1211c4feba55dc6d",
      "parents": [
        "c4a69ecdb463a901b4645230613961e134e897cd"
      ],
      "author": {
        "name": "Joe Thornber",
        "email": "ejt@redhat.com",
        "time": "Wed Mar 28 18:41:28 2012 +0100"
      },
      "committer": {
        "name": "Alasdair G Kergon",
        "email": "agk@redhat.com",
        "time": "Wed Mar 28 18:41:28 2012 +0100"
      },
      "message": "dm thin: support read only external snapshot origins\n\nSupport the use of an external _read only_ device as an origin for a thin\ndevice.\n\nAny read to an unprovisioned area of the thin device will be passed\nthrough to the origin.  Writes trigger allocation of new blocks as\nusual.\n\nOne possible use case for this would be VM hosts that want to run\nguests on thinly-provisioned volumes but have the base image on another\ndevice (possibly shared between many VMs).\n\nSigned-off-by: Joe Thornber \u003cejt@redhat.com\u003e\nSigned-off-by: Mike Snitzer \u003csnitzer@redhat.com\u003e\nSigned-off-by: Alasdair G Kergon \u003cagk@redhat.com\u003e\n"
    },
    {
      "commit": "c4a69ecdb463a901b4645230613961e134e897cd",
      "tree": "c53e0a569f3d390ea2a97f964225d5383c6401ec",
      "parents": [
        "71fd5ae25d88841c08d5bbea90c0f0a12ca05509"
      ],
      "author": {
        "name": "Mike Snitzer",
        "email": "snitzer@redhat.com",
        "time": "Wed Mar 28 18:41:28 2012 +0100"
      },
      "committer": {
        "name": "Alasdair G Kergon",
        "email": "agk@redhat.com",
        "time": "Wed Mar 28 18:41:28 2012 +0100"
      },
      "message": "dm thin: relax hard limit on the maximum size of a metadata device\n\nThe thin metadata format can only make use of a device that is \u003c\u003d\nTHIN_METADATA_MAX_SECTORS (currently 15.9375 GB).  Therefore, there is no\npractical benefit to using a larger device.\n\nHowever, it may be that other factors impose a certain granularity for\nthe space that is allocated to a device (E.g. lvm2 can impose a coarse\ngranularity through the use of large, \u003e\u003d 1 GB, physical extents).\n\nRather than reject a larger metadata device, during thin-pool device\nconstruction, switch to allowing it but issue a warning if a device\nlarger than THIN_METADATA_MAX_SECTORS_WARNING (16 GB) is\nprovided.  Any space over 15.9375 GB will not be used.\n\nSigned-off-by: Mike Snitzer \u003csnitzer@redhat.com\u003e\nSigned-off-by: Alasdair G Kergon \u003cagk@redhat.com\u003e\n"
    },
    {
      "commit": "fe878f34df89ad4af758f40bbec829807dc93a00",
      "tree": "eaa377c640fd595391491725ab477f29062374b1",
      "parents": [
        "035220b33d6865d81d5433600def53373cca7127"
      ],
      "author": {
        "name": "Joe Thornber",
        "email": "ejt@redhat.com",
        "time": "Wed Mar 28 18:41:24 2012 +0100"
      },
      "committer": {
        "name": "Alasdair G Kergon",
        "email": "agk@redhat.com",
        "time": "Wed Mar 28 18:41:24 2012 +0100"
      },
      "message": "dm thin: correct comments\n\nRemove documentation for unimplemented \u0027trim\u0027 message.\n\nI\u0027d planned a \u0027trim\u0027 target message for shrinking thin devices, but\nthis is better handled via the discard ioctl.\n\nSigned-off-by: Joe Thornber \u003cejt@redhat.com\u003e\nSigned-off-by: Mike Snitzer \u003csnitzer@redhat.com\u003e\nSigned-off-by: Alasdair G Kergon \u003cagk@redhat.com\u003e\n"
    },
    {
      "commit": "4998d8ed54f5ebca49b7493c8f646344e6597a3e",
      "tree": "df56179ca9639850c5482b19d2bafc68d2d7509b",
      "parents": [
        "de49025466b0179c1be7b3e827d2f7b032033090"
      ],
      "author": {
        "name": "Masanari Iida",
        "email": "standby24x7@gmail.com",
        "time": "Thu Feb 16 22:14:34 2012 +0900"
      },
      "committer": {
        "name": "Jiri Kosina",
        "email": "jkosina@suse.cz",
        "time": "Tue Feb 21 11:40:37 2012 +0100"
      },
      "message": "Documentation: Fix typo in thin-provisioning.txt\n\nCorrect spelling \"descibes\" to \"describes\" in\nDocumentation/device-mapper/thin-provisioning.txt\n\nSigned-off-by: Masanari Iida \u003cstandby24x7@gmail.com\u003e\nSigned-off-by: Jiri Kosina \u003cjkosina@suse.cz\u003e\n"
    },
    {
      "commit": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5",
      "tree": "a64c94710246b77bb74cd77634581cea3d32cfe1",
      "parents": [
        "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4"
      ],
      "author": {
        "name": "Joe Thornber",
        "email": "thornber@redhat.com",
        "time": "Mon Oct 31 20:21:18 2011 +0000"
      },
      "committer": {
        "name": "Alasdair G Kergon",
        "email": "agk@redhat.com",
        "time": "Mon Oct 31 20:21:18 2011 +0000"
      },
      "message": "dm: add thin provisioning target\n\nInitial EXPERIMENTAL implementation of device-mapper thin provisioning\nwith snapshot support.  The \u0027thin\u0027 target is used to create instances of\nthe virtual devices that are hosted in the \u0027thin-pool\u0027 target.  The\nthin-pool target provides data sharing among devices.  This sharing is\nmade possible using the persistent-data library in the previous patch.\n\nThe main highlight of this implementation, compared to the previous\nimplementation of snapshots, is that it allows many virtual devices to\nbe stored on the same data volume, simplifying administration and\nallowing sharing of data between volumes (thus reducing disk usage).\n\nAnother big feature is support for arbitrary depth of recursive\nsnapshots (snapshots of snapshots of snapshots ...).  The previous\nimplementation of snapshots did this by chaining together lookup tables,\nand so performance was O(depth).  This new implementation uses a single\ndata structure so we don\u0027t get this degradation with depth.\n\nFor further information and examples of how to use this, please read\nDocumentation/device-mapper/thin-provisioning.txt\n\nSigned-off-by: Joe Thornber \u003cthornber@redhat.com\u003e\nSigned-off-by: Mike Snitzer \u003csnitzer@redhat.com\u003e\nSigned-off-by: Alasdair G Kergon \u003cagk@redhat.com\u003e\n"
    }
  ]
}