Alexander Motin
48f376b0c5
Improve arc_read() error reporting
...
Debugging reported NULL de-reference panic in dnode_hold_impl() I found
that for certain types of errors arc_read() may only return error code,
but not properly report it via done and pio arguments. Lack of done
calls may result in reference and/or memory leaks in higher level code.
Lack of error reporting via pio may result in unnoticed errors there.
For example, dbuf_read(), where dbuf_read_impl() ignores arc_read()
return, relies completely on the pio mechanism and missed the errors.
This patch makes arc_read() to always call done callback and always
propagate errors to parent zio, if either is provided.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov >
Reviewed-by: Brian Atkinson <batkinson@lanl.gov >
Signed-off-by: Alexander Motin <mav@FreeBSD.org >
Sponsored by: iXsystems, Inc.
2023-03-24 11:55:36 -05:00
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