Date: Sun, 15 Feb 2009 22:18:16 +0000 (UTC) From: Marcel Moolenaar <marcel@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/geom/part g_part.c g_part.h g_part_if.m Message-ID: <200902152218.n1FMIQQY060435@repoman.freebsd.org>
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marcel 2009-02-15 22:18:16 UTC
FreeBSD src repository
Modified files:
sys/geom/part g_part.c g_part.h g_part_if.m
Log:
SVN rev 188659 on 2009-02-15 22:18:16Z by marcel
Add method precheck to the g_part interface. The precheck
method allows schemes to reject the ctl request, pre-check
the parameters and/or modify/set parameters. There are 2
use cases that triggered the addition:
1. When implementing a R/O scheme, deletes will still
happen to the in-memory representation. The scheme is
not involved in that operation. The pre-check method
can be used to fail the delete up-front. Without this
the write to disk will typically fail, but at that
time the delete already happened.
2. The EBR scheme uses a linked list to record slices.
There's no index. The EBR scheme defines the index
as a function of the start LBA of the partition. The
add verb picks an index for the range and then invokes
the add method of the scheme to fill in the blanks. It
is too late for the add method to change the index.
The pre-check is used to set the index up-front. This
also (silently) overrides/nullifies any (pointless)
user-specified index value.
Revision Changes Path
1.31 +13 -20 src/sys/geom/part/g_part.c
1.13 +17 -0 src/sys/geom/part/g_part.h
1.5 +13 -0 src/sys/geom/part/g_part_if.m
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