Commit 6035ccd8 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-2.6.33' of git://git.kernel.dk/linux-2.6-block 

* 'for-2.6.33' of git://git.kernel.dk/linux-2.6-block: (113 commits)
  cfq-iosched: Do not access cfqq after freeing it
  block: include linux/err.h to use ERR_PTR
  cfq-iosched: use call_rcu() instead of doing grace period stall on queue exit
  blkio: Allow CFQ group IO scheduling even when CFQ is a module
  blkio: Implement dynamic io controlling policy registration
  blkio: Export some symbols from blkio as its user CFQ can be a module
  block: Fix io_context leak after failure of clone with CLONE_IO
  block: Fix io_context leak after clone with CLONE_IO
  cfq-iosched: make nonrot check logic consistent
  io controller: quick fix for blk-cgroup and modular CFQ
  cfq-iosched: move IO controller declerations to a header file
  cfq-iosched: fix compile problem with !CONFIG_CGROUP
  blkio: Documentation
  blkio: Wait on sync-noidle queue even if rq_noidle = 1
  blkio: Implement group_isolation tunable
  blkio: Determine async workload length based on total number of queues
  blkio: Wait for cfq queue to get backlogged if group is empty
  blkio: Propagate cgroup weight updation to cfq groups
  blkio: Drop the reference to queue once the task changes cgroup
  blkio: Provide some isolation between groups
  ...
parents 23eb3b64 878eaddd

Documentation/blockdev/drbd/DRBD-8.3-data-packets.svg

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Documentation/blockdev/drbd/DRBD-data-packets.svg

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File added.

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Documentation/blockdev/drbd/README.txt

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Description



  DRBD is a shared-nothing, synchronously replicated block device. It

  is designed to serve as a building block for high availability

  clusters and in this context, is a "drop-in" replacement for shared

  storage. Simplistically, you could see it as a network RAID 1.



  Please visit http://www.drbd.org to find out more.



The here included files are intended to help understand the implementation



DRBD-8.3-data-packets.svg, DRBD-data-packets.svg  

  relates some functions, and write packets.



conn-states-8.dot, disk-states-8.dot, node-states-8.dot

  The sub graphs of DRBD's state transitions

Documentation/blockdev/drbd/conn-states-8.dot

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digraph conn_states {

	StandAllone  -> WFConnection   [ label = "ioctl_set_net()" ]

	WFConnection -> Unconnected    [ label = "unable to bind()" ]

	WFConnection -> WFReportParams [ label = "in connect() after accept" ]

	WFReportParams -> StandAllone  [ label = "checks in receive_param()" ]

	WFReportParams -> Connected    [ label = "in receive_param()" ]

	WFReportParams -> WFBitMapS    [ label = "sync_handshake()" ]

	WFReportParams -> WFBitMapT    [ label = "sync_handshake()" ]

	WFBitMapS -> SyncSource        [ label = "receive_bitmap()" ]

	WFBitMapT -> SyncTarget        [ label = "receive_bitmap()" ]

	SyncSource -> Connected

	SyncTarget -> Connected

	SyncSource -> PausedSyncS

	SyncTarget -> PausedSyncT

	PausedSyncS -> SyncSource

	PausedSyncT -> SyncTarget

	Connected   -> WFConnection    [ label = "* on network error" ]

}

Documentation/blockdev/drbd/disk-states-8.dot

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digraph disk_states {

	Diskless -> Inconsistent       [ label = "ioctl_set_disk()" ]

	Diskless -> Consistent         [ label = "ioctl_set_disk()" ]

	Diskless -> Outdated           [ label = "ioctl_set_disk()" ]

	Consistent -> Outdated         [ label = "receive_param()" ]

	Consistent -> UpToDate         [ label = "receive_param()" ]

	Consistent -> Inconsistent     [ label = "start resync" ]

	Outdated   -> Inconsistent     [ label = "start resync" ]

	UpToDate   -> Inconsistent     [ label = "ioctl_replicate" ]

	Inconsistent -> UpToDate       [ label = "resync completed" ]

	Consistent -> Failed           [ label = "io completion error" ]

	Outdated   -> Failed           [ label = "io completion error" ]

	UpToDate   -> Failed           [ label = "io completion error" ]

	Inconsistent -> Failed         [ label = "io completion error" ]

	Failed -> Diskless             [ label = "sending notify to peer" ]

}

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