)]}'
{
  "log": [
    {
      "commit": "75acb9cd2ef0bbb463098fdd40cbcdda79d45fa3",
      "tree": "acb8f0a63ac1249146041b06eaaa003ea24c8c7a",
      "parents": [
        "9db5579be4bb5320c3248f6acf807aedf05ae143"
      ],
      "author": {
        "name": "Nick Piggin",
        "email": "npiggin@suse.de",
        "time": "Fri Feb 08 04:19:50 2008 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Fri Feb 08 09:22:30 2008 -0800"
      },
      "message": "rd: support XIP\n\nSupport direct_access XIP method with brd.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "9db5579be4bb5320c3248f6acf807aedf05ae143",
      "tree": "fde09bbeb427946b30d2e0fb6b00494a42488052",
      "parents": [
        "daeb51e62cacde31c8245866e1096ff79a0c83fe"
      ],
      "author": {
        "name": "Nick Piggin",
        "email": "npiggin@suse.de",
        "time": "Fri Feb 08 04:19:49 2008 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Fri Feb 08 09:22:30 2008 -0800"
      },
      "message": "rewrite rd\n\nThis is a rewrite of the ramdisk block device driver.\n\nThe old one is really difficult because it effectively implements a block\ndevice which serves data out of its own buffer cache.  It relies on the dirty\nbit being set, to pin its backing store in cache, however there are non\ntrivial paths which can clear the dirty bit (eg.  try_to_free_buffers()),\nwhich had recently lead to data corruption.  And in general it is completely\nwrong for a block device driver to do this.\n\nThe new one is more like a regular block device driver.  It has no idea about\nvm/vfs stuff.  It\u0027s backing store is similar to the buffer cache (a simple\nradix-tree of pages), but it doesn\u0027t know anything about page cache (the pages\nin the radix tree are not pagecache pages).\n\nThere is one slight downside -- direct block device access and filesystem\nmetadata access goes through an extra copy and gets stored in RAM twice.\nHowever, this downside is only slight, because the real buffercache of the\ndevice is now reclaimable (because we\u0027re not playing crazy games with it), so\nunder memory intensive situations, footprint should effectively be the same --\nmaybe even a slight advantage to the new driver because it can also reclaim\nbuffer heads.\n\nThe fact that it now goes through all the regular vm/fs paths makes it\nmuch more useful for testing, too.\n\n   text    data     bss     dec     hex filename\n   2837     849     384    4070     fe6 drivers/block/rd.o\n   3528     371      12    3911     f47 drivers/block/brd.o\n\nText is larger, but data and bss are smaller, making total size smaller.\n\nA few other nice things about it:\n- Similar structure and layout to the new loop device handlinag.\n- Dynamic ramdisk creation.\n- Runtime flexible buffer head size (because it is no longer part of the\n  ramdisk code).\n- Boot / load time flexible ramdisk size, which could easily be extended\n  to a per-ramdisk runtime changeable size (eg. with an ioctl).\n- Can use highmem for the backing store.\n\n[akpm@linux-foundation.org: fix build]\n[byron.bbradley@gmail.com: make rd_size non-static]\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Byron Bradley \u003cbyron.bbradley@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    }
  ]
}