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What:		/sys/fs/xfs/<disk>/log/log_head_lsn
Date:		July 2014
KernelVersion:	3.17
Contact:	xfs@oss.sgi.com
Description:
		The log sequence number (LSN) of the current head of the
		log. The LSN is exported in "cycle:basic block" format.
Users:		xfstests

What:		/sys/fs/xfs/<disk>/log/log_tail_lsn
Date:		July 2014
KernelVersion:	3.17
Contact:	xfs@oss.sgi.com
Description:
		The log sequence number (LSN) of the current tail of the
		log. The LSN is exported in "cycle:basic block" format.

What:		/sys/fs/xfs/<disk>/log/reserve_grant_head
Date:		July 2014
KernelVersion:	3.17
Contact:	xfs@oss.sgi.com
Description:
		The current state of the log reserve grant head. It
		represents the total log reservation of all currently
		outstanding transactions. The grant head is exported in
		"cycle:bytes" format.
Users:		xfstests

What:		/sys/fs/xfs/<disk>/log/write_grant_head
Date:		July 2014
KernelVersion:	3.17
Contact:	xfs@oss.sgi.com
Description:
		The current state of the log write grant head. It
		represents the total log reservation of all currently
		oustanding transactions, including regrants due to
		rolling transactions. The grant head is exported in
		"cycle:bytes" format.
Users:		xfstests