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authorDavid Howells <dhowells@redhat.com>2013-05-10 22:50:26 +0400
committerDavid Howells <dhowells@redhat.com>2013-06-19 17:16:47 +0400
commitcaaef6900befb45689b1d1831ce3c7e7fb5b504f (patch)
tree557fa8f425bd18261bea4950a2d821ffe8051903 /fs/cachefiles
parent493f7bc11457bc1f6fbf25a4b2bdf215ebaf050f (diff)
downloadlinux-caaef6900befb45689b1d1831ce3c7e7fb5b504f.tar.xz
FS-Cache: Fix object state machine to have separate work and wait states
Fix object state machine to have separate work and wait states as that makes it easier to envision. There are now three kinds of state: (1) Work state. This is an execution state. No event processing is performed by a work state. The function attached to a work state returns a pointer indicating the next state to which the OSM should transition. Returning NO_TRANSIT repeats the current state, but goes back to the scheduler first. (2) Wait state. This is an event processing state. No execution is performed by a wait state. Wait states are just tables of "if event X occurs, clear it and transition to state Y". The dispatcher returns to the scheduler if none of the events in which the wait state has an interest are currently pending. (3) Out-of-band state. This is a special work state. Transitions to normal states can be overridden when an unexpected event occurs (eg. I/O error). Instead the dispatcher disables and clears the OOB event and transits to the specified work state. This then acts as an ordinary work state, though object->state points to the overridden destination. Returning NO_TRANSIT resumes the overridden transition. In addition, the states have names in their definitions, so there's no need for tables of state names. Further, the EV_REQUEUE event is no longer necessary as that is automatic for work states. Since the states are now separate structs rather than values in an enum, it's not possible to use comparisons other than (non-)equality between them, so use some object->flags to indicate what phase an object is in. The EV_RELEASE, EV_RETIRE and EV_WITHDRAW events have been squished into one (EV_KILL). An object flag now carries the information about retirement. Similarly, the RELEASING, RECYCLING and WITHDRAWING states have been merged into an KILL_OBJECT state and additional states have been added for handling waiting dependent objects (JUMPSTART_DEPS and KILL_DEPENDENTS). A state has also been added for synchronising with parent object initialisation (WAIT_FOR_PARENT) and another for initiating look up (PARENT_READY). Signed-off-by: David Howells <dhowells@redhat.com> Tested-By: Milosz Tanski <milosz@adfin.com> Acked-by: Jeff Layton <jlayton@redhat.com>
Diffstat (limited to 'fs/cachefiles')
-rw-r--r--fs/cachefiles/interface.c2
-rw-r--r--fs/cachefiles/namei.c4
2 files changed, 3 insertions, 3 deletions
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 746ce532e130..3d763217faf3 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -263,7 +263,7 @@ static void cachefiles_drop_object(struct fscache_object *_object)
#endif
/* delete retired objects */
- if (object->fscache.state == FSCACHE_OBJECT_RECYCLING &&
+ if (test_bit(FSCACHE_OBJECT_RETIRE, &object->fscache.flags) &&
_object != cache->cache.fsdef
) {
_debug("- retire object OBJ%x", object->fscache.debug_id);
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 01979a3f5121..25badd1aec5c 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -38,7 +38,7 @@ void __cachefiles_printk_object(struct cachefiles_object *object,
printk(KERN_ERR "%sobject: OBJ%x\n",
prefix, object->fscache.debug_id);
printk(KERN_ERR "%sobjstate=%s fl=%lx wbusy=%x ev=%lx[%lx]\n",
- prefix, fscache_object_states[object->fscache.state],
+ prefix, object->fscache.state->name,
object->fscache.flags, work_busy(&object->fscache.work),
object->fscache.events, object->fscache.event_mask);
printk(KERN_ERR "%sops=%u inp=%u exc=%u\n",
@@ -127,7 +127,7 @@ static void cachefiles_mark_object_buried(struct cachefiles_cache *cache,
found_dentry:
kdebug("preemptive burial: OBJ%x [%s] %p",
object->fscache.debug_id,
- fscache_object_states[object->fscache.state],
+ object->fscache.state->name,
dentry);
if (fscache_object_is_live(&object->fscache)) {