Initial outlines.

bcache-doc.tex

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+What is bcache
+
+Bcache history
+- Kent overstreet
+- merge in 3.10
+- part of contributors
+- enterprise stabled since 5.3
+
+How to install bcache
+
+How to use bcache
+
+Config and manage bcache via sysfs
+
+Bcache concepts
+- Cache device and (cached) backing device
+- Closure
+- Bucket
+- bkey 
+- Btree and bset 
+- journal
+- generation
+- garbage collection
+- fifo
+- Cache modes
+- Flash only volume
+
+Device registration and unregistartion
+
+Cache attache and detach
+
+Bcache initialization and shutdown
+
+Read request handling
+- Without cache device
+- With cache device
+  - Write-back mode
+  - Write-through mode
+  - Write-around and read-around mode
+Write request handling
+- Write-back mode
+- Write-through mode
+- Write-around mode
+
+Journaling
+- journaling and journal flush
+- journal reclaim
+- journal replay
+- journal space reservation
+
+Btree, bset and bkey
+- Btree allocation
+  from memory and from ssd
+  btree canibalize
+- in-memory btree node cache shrink
+- bkey search, insert, delete
+- extent management
+- check key?
+
+Garbage collection,
+- garbage collection
+- moving gc
+- replacement policies
+- proactive gc
+
+Hot plug and I/O error handling
+
+Zoned devices
+- As backing device
+- As cache device
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+FIFO and merge sort
+
+Tracing
+
+Bcache internal debugging
+
+States and statistics
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+All the lockes used in bcache code
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