extent information of a file. It can be used to map logical blocks
in a file to physical blocks in the block device.
+Severity : normal
+Bugzilla : 16498
+Description: Get RAID stripe size from superblock
+Details : RAID striping parameters are now saved in the superblock itself,
+ so we should use these parameters instead of having to specify
+ a mount option each time.
+
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04-26-2008 Sun Microsystems, Inc.