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dm cache: update Documentation for invalidate_cblocks's range syntax

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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: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
This commit is contained in:
Mike Snitzer 2013-11-26 11:03:54 -05:00
parent af95e7a69b
commit 83f539e1a4
1 changed files with 6 additions and 4 deletions
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10
Documentation/device-mapper/cache.txt
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@ -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>]*