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authorDavid Howells <dhowells@redhat.com>2012-12-05 17:34:49 +0400
committerDavid Howells <dhowells@redhat.com>2012-12-21 02:19:22 +0400
commit969695215f9a865cbf64c4ce3742ac9fc57fffed (patch)
treec46829a111afa436a2a1b18495a46348ccee04f3
parent8c209ce721444a61b61d9e772746c721e4d8d1e8 (diff)
downloadlinux-969695215f9a865cbf64c4ce3742ac9fc57fffed.tar.xz
FS-Cache: Add transition to handle invalidate immediately after lookup
Add a missing transition to the FS-Cache object state machine to handle an invalidation event occuring between the back end completing the object lookup by calling fscache_obtained_object() (which moves to state OBJECT_AVAILABLE) and the backend returning to fscache_lookup_object() and thence to fscache_object_state_machine() which then does a goto lookup_transit to handle the transition - but lookup_transit doesn't handle EV_INVALIDATE. Without this, the following BUG can be logged: FS-Cache: Unsupported event 2 [5/f7] in state OBJECT_AVAILABLE ------------[ cut here ]------------ kernel BUG at fs/fscache/object.c:357! Where event 2 is EV_INVALIDATE. Signed-off-by: David Howells <dhowells@redhat.com>
-rw-r--r--fs/fscache/object.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index 2c512cbac380..50d41c180211 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -284,6 +284,9 @@ lookup_transit:
case FSCACHE_OBJECT_EV_ERROR:
new_state = FSCACHE_OBJECT_LC_DYING;
goto change_state;
+ case FSCACHE_OBJECT_EV_INVALIDATE:
+ new_state = FSCACHE_OBJECT_INVALIDATING;
+ goto change_state;
case FSCACHE_OBJECT_EV_REQUEUE:
goto done;
case -1: