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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: Mike Snitzer <snitzer@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com>
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@ -266,10 +266,12 @@ E.g.
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Invalidation is removing an entry from the cache without writing it
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back. Cache blocks can be invalidated via the invalidate_cblocks
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message, which takes an arbitrary number of cblock ranges. Each cblock
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must be expressed as a decimal value, in the future a variant message
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that takes cblock ranges expressed in hexidecimal may be needed to
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better support efficient invalidation of larger caches. The cache must
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be in passthrough mode when invalidate_cblocks is used.
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range's end value is "one past the end", meaning 5-10 expresses a range
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of values from 5 to 9. Each cblock must be expressed as a decimal
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value, in the future a variant message that takes cblock ranges
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expressed in hexidecimal may be needed to better support efficient
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invalidation of larger caches. The cache must be in passthrough mode
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when invalidate_cblocks is used.
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invalidate_cblocks [<cblock>|<cblock begin>-<cblock end>]*
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