On Tue, Oct 07, 2008 at 02:52:19PM -0400, Theodore Tso wrote: > Right, thanks. This time in proper English. :-) > > * FIEMAP_EXTENT_ENCODED > > This extent does not consist of plain filesystem blocks but is > encoded (e.g. encrypted or compressed). Reading the data in this > extent via I/O to the block device will have undefined results. > > Note that it is *always* undefined to try to update the data > in-place by writing to the indicated location without the > assistance of the filesystem, or to access the data using the > information returned by the FIEMAP interface while the filesystem > is mounted. In other words, user applications may only read the > extent data via I/O to the block device while the filesystem is > unmounted, and then only if the FIEMAP_EXTENT_ENCODED flag is > clear; user applications must not try reading or writing to the > filesystem via the block device under any other circumstances.
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