number, but with 8TB+ filesystems there are more than 65536
groups, causing an oops.
+Severity : enhancement
+Bugzilla : 10555
+Description: Add a FIEMAP(FIle Extent MAP) ioctl for ldiskfs
+Details : FIEMAP ioctl will allow an application to efficiently fetch the
+ extent information of a file. It can be used to map logical blocks
+ in a file to physical blocks in the block device.
+
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04-26-2008 Sun Microsystems, Inc.