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9.25. Metadata I/O Completion
xfslogd/N
per-CPU daemon
Threads that handle I/O completion work for iclog buffers
xlog_state_do_callbacks
multiple completions to unpin metadata buffers waiting for this transaction
and also metadata
xfs_buf_do_callbacks
typically, removing from AIL and freeing up buffer_item memory
xfsdatad/N
similar idea for data path
very different between 2.4 and 2.6
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9.24. Metadata Buffering
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9.26. Delayed write buffers
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