Hi folks,
While playing around with the FBT provider I came across something I simply
can't figure out how to do.
I would really like to track I/O to some of our zvols - for writes something
like this does the trick :
dtrace -qn 'fbt:zfs:zvol_log_write:entry { @[args[0]->zv_name] = count(); }';
For reads this proves more difficult since the zvol_state struct (which holds
the zvol name) is not passed as an argument.
I haven't used C since school (more than a decade ago) so excuse me for
mistaking but
judging from the zvol_read function in
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/zvol.c
uses a pointer to the zvol_state struct instead.
How can I get my hands on that data from dtrace ?
/HenrikJ
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