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staging: lustre: osc: osc_extent should hold refcount to osc_object 

To avoid a race that osc_extent and osc_object destroy happens on the
same time, which causes kernel crash.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7164
Reviewed-on: http://review.whamcloud.com/16433
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Patrick Farrell <paf@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jinshan Xiong 2016-11-10 12:30:54 -05:00 committed by Greg Kroah-Hartman
parent a80ba5fe75
commit d7f651ad64
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/lustre/lustre/osc/osc_cache.c
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@ -360,6 +360,7 @@ static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
RB_CLEAR_NODE(&ext->oe_node);
ext->oe_obj = obj;
cl_object_get(osc2cl(obj));
atomic_set(&ext->oe_refc, 1);
atomic_set(&ext->oe_users, 0);
INIT_LIST_HEAD(&ext->oe_link);
@ -398,6 +399,7 @@ static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
LDLM_LOCK_PUT(ext->oe_dlmlock);
ext->oe_dlmlock = NULL;
}
cl_object_put(env, osc2cl(ext->oe_obj));
osc_extent_free(ext);
}
}