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authorMike Snitzer <snitzer@redhat.com>2013-11-26 11:03:54 -0500
committerMike Snitzer <snitzer@redhat.com>2013-12-10 16:35:15 -0500
commit83f539e1a45a07934f0da69dc545bcbde01de36c (patch)
treeb64dee22c26ff8f322ca4000e62ee144245baebf
parentaf95e7a69b54bca48092e3013a92cfa3043c9c73 (diff)
downloadlinux-83f539e1a45a07934f0da69dc545bcbde01de36c.tar.bz2
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>
-rw-r--r--Documentation/device-mapper/cache.txt10
1 files changed, 6 insertions, 4 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index 274752f8bdf9..719320b5ed3f 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -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>]*