Re: svn commit: r237518 - in head: share/man/man9 sys/cam/scsi
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On 24.06.2012 8:29, Kenneth D. Merry wrote:
> Author: ken
> Date: Sun Jun 24 04:29:03 2012
> New Revision: 237518
> URL: http://svn.freebsd.org/changeset/base/237518
>=20
> Log:
> Fix a bug which causes a panic in daopen(). The panic is caused by
> a da(4) instance going away while GEOM is still probing it.
> =20
> In this case, the GEOM disk class instance has been created by
> disk_create(), and the taste of the disk is queued in the GEOM
> event queue.
> =20
> While that event is queued, the da(4) instance goes away. When the
> open call comes into the da(4) driver, it dereferences the freed
> (but non-NULL) peripheral pointer provided by GEOM, which results
> in a panic.
> =20
> The solution is to add a callback to the GEOM disk code that is
> called when all of its resources are cleaned up. This is
> implemented inside GEOM by adding an optional callback that is
> called when all consumers have detached from a provider, and the
> provider is about to be deleted.
> =20
> geom.h: Add a new, optional, providergone callback that
> is called when a provider is about to be deleted.
> =20
> MFC after: 5 days
This will break ABI. If you want to merge this change,
it is better to use one of spare field in the geom structures.
> @@ -102,6 +103,7 @@ struct g_class {
> g_start_t *start;
> g_spoiled_t *spoiled;
> g_attrchanged_t *attrchanged;
> + g_provgone_t *providergone;
> g_dumpconf_t *dumpconf;
> g_access_t *access;
> g_orphan_t *orphan;
> @@ -133,6 +135,7 @@ struct g_geom {
> g_start_t *start;
> g_spoiled_t *spoiled;
> g_attrchanged_t *attrchanged;
> + g_provgone_t *providergone;
> g_dumpconf_t *dumpconf;
> g_access_t *access;
> g_orphan_t *orphan;
--=20
WBR, Andrey V. Elsukov
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