Ted, I think this is a really great definition.
jim
A couple of spelling/grammar fixes below.
Theodore Tso wrote:
* FIEMAP_EXTENT_ENCODED
This extent does not consistant 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 resuts.
Note that it is *always* undefined to try to update the data
in-place by writing to indicated location without the assistance of
^^^^^^^^^^^^ to the
the filesystem, or accessing the data using the information
^^^^^^^^^^^^ or by
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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