markj 0d7f42693b Add some fail points to gmirror.
These are useful for testing changes to I/O error handling, and for
reproducing existing bugs in a controlled manner. The fail points are

    g_mirror_regular_request_read
    g_mirror_regular_request_write
    g_mirror_sync_request_read
    g_mirror_sync_request_write
    g_mirror_metadata_write

They all effectively allow one to inject an error value into the bio_error
field of a corresponding BIO request as it is being completed.

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division
2016-09-06 23:35:48 +00:00
..
2016-04-29 20:56:58 +00:00
2016-09-06 23:35:48 +00:00