#define FSCACHE_DEBUG_LEVEL COOKIE
#include <linux/module.h>
+#include <linux/slab.h>
#include "internal.h"
const char *fscache_object_states[FSCACHE_OBJECT__NSTATES] = {
[FSCACHE_OBJECT_CREATING] = "OBJECT_CREATING",
[FSCACHE_OBJECT_AVAILABLE] = "OBJECT_AVAILABLE",
[FSCACHE_OBJECT_ACTIVE] = "OBJECT_ACTIVE",
+ [FSCACHE_OBJECT_INVALIDATING] = "OBJECT_INVALIDATING",
[FSCACHE_OBJECT_UPDATING] = "OBJECT_UPDATING",
[FSCACHE_OBJECT_DYING] = "OBJECT_DYING",
[FSCACHE_OBJECT_LC_DYING] = "OBJECT_LC_DYING",
[FSCACHE_OBJECT_CREATING] = "CRTN",
[FSCACHE_OBJECT_AVAILABLE] = "AVBL",
[FSCACHE_OBJECT_ACTIVE] = "ACTV",
+ [FSCACHE_OBJECT_INVALIDATING] = "INVL",
[FSCACHE_OBJECT_UPDATING] = "UPDT",
[FSCACHE_OBJECT_DYING] = "DYNG",
[FSCACHE_OBJECT_LC_DYING] = "LCDY",
static void fscache_initialise_object(struct fscache_object *);
static void fscache_lookup_object(struct fscache_object *);
static void fscache_object_available(struct fscache_object *);
+static void fscache_invalidate_object(struct fscache_object *);
static void fscache_release_object(struct fscache_object *);
static void fscache_withdraw_object(struct fscache_object *);
static void fscache_enqueue_dependents(struct fscache_object *);
spin_unlock(&parent->lock);
}
+/*
+ * Notify netfs of invalidation completion.
+ */
+static inline void fscache_invalidation_complete(struct fscache_cookie *cookie)
+{
+ if (test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
+}
+
/*
* process events that have been sent to an object's state machine
* - initiates parent lookup
{
enum fscache_object_state new_state;
struct fscache_cookie *cookie;
+ int event;
ASSERT(object != NULL);
/* wait for the parent object to become ready */
case FSCACHE_OBJECT_INIT:
object->event_mask =
- ULONG_MAX & ~(1 << FSCACHE_OBJECT_EV_CLEARED);
+ FSCACHE_OBJECT_EVENTS_MASK &
+ ~(1 << FSCACHE_OBJECT_EV_CLEARED);
fscache_initialise_object(object);
goto done;
case FSCACHE_OBJECT_ACTIVE:
goto active_transit;
+ /* Invalidate an object on disk */
+ case FSCACHE_OBJECT_INVALIDATING:
+ clear_bit(FSCACHE_OBJECT_EV_INVALIDATE, &object->events);
+ fscache_stat(&fscache_n_invalidates_run);
+ fscache_stat(&fscache_n_cop_invalidate_object);
+ fscache_invalidate_object(object);
+ fscache_stat_d(&fscache_n_cop_invalidate_object);
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_UPDATE);
+ goto active_transit;
+
/* update the object metadata on disk */
case FSCACHE_OBJECT_UPDATING:
clear_bit(FSCACHE_OBJECT_EV_UPDATE, &object->events);
/* determine the transition from a lookup state */
lookup_transit:
- switch (fls(object->events & object->event_mask) - 1) {
+ event = fls(object->events & object->event_mask) - 1;
+ switch (event) {
case FSCACHE_OBJECT_EV_WITHDRAW:
case FSCACHE_OBJECT_EV_RETIRE:
case FSCACHE_OBJECT_EV_RELEASE:
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:
/* determine the transition from an active state */
active_transit:
- switch (fls(object->events & object->event_mask) - 1) {
+ event = fls(object->events & object->event_mask) - 1;
+ switch (event) {
case FSCACHE_OBJECT_EV_WITHDRAW:
case FSCACHE_OBJECT_EV_RETIRE:
case FSCACHE_OBJECT_EV_RELEASE:
case FSCACHE_OBJECT_EV_ERROR:
new_state = FSCACHE_OBJECT_DYING;
goto change_state;
+ case FSCACHE_OBJECT_EV_INVALIDATE:
+ new_state = FSCACHE_OBJECT_INVALIDATING;
+ goto change_state;
case FSCACHE_OBJECT_EV_UPDATE:
new_state = FSCACHE_OBJECT_UPDATING;
goto change_state;
/* determine the transition from a terminal state */
terminal_transit:
- switch (fls(object->events & object->event_mask) - 1) {
+ event = fls(object->events & object->event_mask) - 1;
+ switch (event) {
case FSCACHE_OBJECT_EV_WITHDRAW:
new_state = FSCACHE_OBJECT_WITHDRAWING;
goto change_state;
unsupported_event:
printk(KERN_ERR "FS-Cache:"
- " Unsupported event %lx [mask %lx] in state %s\n",
- object->events, object->event_mask,
+ " Unsupported event %d [%lx/%lx] in state %s\n",
+ event, object->events, object->event_mask,
fscache_object_states[object->state]);
BUG();
}
if (object->n_in_progress == 0) {
if (object->n_ops > 0) {
ASSERTCMP(object->n_ops, >=, object->n_obj_ops);
- ASSERTIF(object->n_ops > object->n_obj_ops,
- !list_empty(&object->pending_ops));
fscache_start_operations(object);
} else {
ASSERT(list_empty(&object->pending_ops));
if (object->cookie == cookie) {
hlist_del_init(&object->cookie_link);
object->cookie = NULL;
+ fscache_invalidation_complete(cookie);
detached = true;
}
spin_unlock(&cookie->lock);
return result;
}
EXPORT_SYMBOL(fscache_check_aux);
+
+/*
+ * Asynchronously invalidate an object.
+ */
+static void fscache_invalidate_object(struct fscache_object *object)
+{
+ struct fscache_operation *op;
+ struct fscache_cookie *cookie = object->cookie;
+
+ _enter("{OBJ%x}", object->debug_id);
+
+ /* Reject any new read/write ops and abort any that are pending. */
+ fscache_invalidate_writes(cookie);
+ clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
+ fscache_cancel_all_ops(object);
+
+ /* Now we have to wait for in-progress reads and writes */
+ op = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op) {
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR);
+ _leave(" [ENOMEM]");
+ return;
+ }
+
+ fscache_operation_init(op, object->cache->ops->invalidate_object, NULL);
+ op->flags = FSCACHE_OP_ASYNC | (1 << FSCACHE_OP_EXCLUSIVE);
+
+ spin_lock(&cookie->lock);
+ if (fscache_submit_exclusive_op(object, op) < 0)
+ goto submit_op_failed;
+ spin_unlock(&cookie->lock);
+ fscache_put_operation(op);
+
+ /* Once we've completed the invalidation, we know there will be no data
+ * stored in the cache and thus we can reinstate the data-check-skip
+ * optimisation.
+ */
+ set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
+
+ /* We can allow read and write requests to come in once again. They'll
+ * queue up behind our exclusive invalidation operation.
+ */
+ fscache_invalidation_complete(cookie);
+ _leave("");
+ return;
+
+submit_op_failed:
+ spin_unlock(&cookie->lock);
+ kfree(op);
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR);
+ _leave(" [EIO]");
+}
projects / karo-tx-linux.git / blobdiff