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Commit 83f539e1 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm cache: update Documentation for invalidate_cblocks's range syntax 



The cache target's invalidate_cblocks message allows cache block
(cblock) ranges to be expressed with: <cblock start>-<cblock end>

The range's <cblock end> value is "one past the end", so the range
includes <cblock start> through <cblock end>-1.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Acked-by: default avatarJoe Thornber <ejt@redhat.com>
parent af95e7a6

Documentation/device-mapper/cache.txt

+6 −4
Original line number Diff line number Diff line
@@ -266,10 +266,12 @@ E.g. 
Invalidation is removing an entry from the cache without writing it

back.  Cache blocks can be invalidated via the invalidate_cblocks

message, which takes an arbitrary number of cblock ranges.  Each cblock

must be expressed as a decimal value, in the future a variant message

that takes cblock ranges expressed in hexidecimal may be needed to

better support efficient invalidation of larger caches.  The cache must

be in passthrough mode when invalidate_cblocks is used.

range's end value is "one past the end", meaning 5-10 expresses a range

of values from 5 to 9.  Each cblock must be expressed as a decimal

value, in the future a variant message that takes cblock ranges

expressed in hexidecimal may be needed to better support efficient

invalidation of larger caches.  The cache must be in passthrough mode

when invalidate_cblocks is used.



   invalidate_cblocks [<cblock>|<cblock begin>-<cblock end>]*