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Commit 6e0d2d03 authored by Namhyung Kim's avatar Namhyung Kim Committed by NeilBrown
Browse files

md: add documentation for bad block log 



Previous patch in the bad block series added new sysfs interfaces
([unacknowledged_]bad_blocks) for each rdev without documentation.
Add it.

Signed-off-by: default avatarNamhyung Kim <namhyung@gmail.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 16c791a5

Documentation/md.txt

+14 −1
Original line number Diff line number Diff line
@@ -419,7 +419,6 @@ Each directory contains: 
        written, it will be rejected.



      recovery_start



        When the device is not 'in_sync', this records the number of

	sectors from the start of the device which are known to be

	correct.  This is normally zero, but during a recovery
@@ -435,6 +434,20 @@ Each directory contains: 
	Setting this to 'none' is equivalent to setting 'in_sync'.

	Setting to any other value also clears the 'in_sync' flag.

	

      bad_blocks

	This gives the list of all known bad blocks in the form of

	start address and length (in sectors respectively). If output

	is too big to fit in a page, it will be truncated. Writing

	"sector length" to this file adds new acknowledged (i.e.

	recorded to disk safely) bad blocks.



      unacknowledged_bad_blocks

	This gives the list of known-but-not-yet-saved-to-disk bad

	blocks in the same form of 'bad_blocks'. If output is too big

	to fit in a page, it will be truncated. Writing to this file

	adds bad blocks without acknowledging them. This is largely

	for testing.







An active md device will also contain and entry for each active device