)]}'
{
  "commit": "9361401eb7619c033e2394e4f9f6d410d6719ac7",
  "tree": "04b94a71f2366988c17740d1c16cfbdec41d5d2e",
  "parents": [
    "d366e40a1cabd453be6e2609caa7e12f9ca17b1f"
  ],
  "author": {
    "name": "David Howells",
    "email": "dhowells@redhat.com",
    "time": "Sat Sep 30 20:45:40 2006 +0200"
  },
  "committer": {
    "name": "Jens Axboe",
    "email": "axboe@nelson.home.kernel.dk",
    "time": "Sat Sep 30 20:52:31 2006 +0200"
  },
  "message": "[PATCH] BLOCK: Make it possible to disable the block layer [try #6]\n\nMake it possible to disable the block layer.  Not all embedded devices require\nit, some can make do with just JFFS2, NFS, ramfs, etc - none of which require\nthe block layer to be present.\n\nThis patch does the following:\n\n (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev\n     support.\n\n (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls\n     an item that uses the block layer.  This includes:\n\n     (*) Block I/O tracing.\n\n     (*) Disk partition code.\n\n     (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.\n\n     (*) The SCSI layer.  As far as I can tell, even SCSI chardevs use the\n     \t block layer to do scheduling.  Some drivers that use SCSI facilities -\n     \t such as USB storage - end up disabled indirectly from this.\n\n     (*) Various block-based device drivers, such as IDE and the old CDROM\n     \t drivers.\n\n     (*) MTD blockdev handling and FTL.\n\n     (*) JFFS - which uses set_bdev_super(), something it could avoid doing by\n     \t taking a leaf out of JFFS2\u0027s book.\n\n (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and\n     linux/elevator.h contingent on CONFIG_BLOCK being set.  sector_div() is,\n     however, still used in places, and so is still available.\n\n (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and\n     parts of linux/fs.h.\n\n (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.\n\n (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.\n\n (*) set_page_dirty() doesn\u0027t call __set_page_dirty_buffers() if CONFIG_BLOCK\n     is not enabled.\n\n (*) fs/no-block.c is created to hold out-of-line stubs and things that are\n     required when CONFIG_BLOCK is not set:\n\n     (*) Default blockdev file operations (to give error ENODEV on opening).\n\n (*) Makes some /proc changes:\n\n     (*) /proc/devices does not list any blockdevs.\n\n     (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.\n\n (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.\n\n (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if\n     given command other than Q_SYNC or if a special device is specified.\n\n (*) In init/do_mounts.c, no reference is made to the blockdev routines if\n     CONFIG_BLOCK is not defined.  This does not prohibit NFS roots or JFFS2.\n\n (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return\n     error ENOSYS by way of cond_syscall if so).\n\n (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if\n     CONFIG_BLOCK is not set, since they can\u0027t then happen.\n\nSigned-Off-By: David Howells \u003cdhowells@redhat.com\u003e\nSigned-off-by: Jens Axboe \u003caxboe@kernel.dk\u003e\n",
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