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-rw-r--r--fs/afs/cell.c99
1 files changed, 70 insertions, 29 deletions
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index bc7ed46aaca9..52233fa6195f 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -18,6 +18,7 @@
static unsigned __read_mostly afs_cell_gc_delay = 10;
static unsigned __read_mostly afs_cell_min_ttl = 10 * 60;
static unsigned __read_mostly afs_cell_max_ttl = 24 * 60 * 60;
+static atomic_t cell_debug_id;
static void afs_queue_cell_manager(struct afs_net *);
static void afs_manage_cell_work(struct work_struct *);
@@ -48,7 +49,8 @@ static void afs_set_cell_timer(struct afs_net *net, time64_t delay)
* hold net->cells_lock at least read-locked.
*/
static struct afs_cell *afs_find_cell_locked(struct afs_net *net,
- const char *name, unsigned int namesz)
+ const char *name, unsigned int namesz,
+ enum afs_cell_trace reason)
{
struct afs_cell *cell = NULL;
struct rb_node *p;
@@ -87,19 +89,20 @@ static struct afs_cell *afs_find_cell_locked(struct afs_net *net,
return ERR_PTR(-ENOENT);
found:
- return afs_use_cell(cell);
+ return afs_use_cell(cell, reason);
}
/*
* Look up and get an activation reference on a cell record.
*/
struct afs_cell *afs_find_cell(struct afs_net *net,
- const char *name, unsigned int namesz)
+ const char *name, unsigned int namesz,
+ enum afs_cell_trace reason)
{
struct afs_cell *cell;
down_read(&net->cells_lock);
- cell = afs_find_cell_locked(net, name, namesz);
+ cell = afs_find_cell_locked(net, name, namesz, reason);
up_read(&net->cells_lock);
return cell;
}
@@ -197,6 +200,8 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
cell->dns_status = vllist->status;
smp_store_release(&cell->dns_lookup_count, 1); /* vs source/status */
atomic_inc(&net->cells_outstanding);
+ cell->debug_id = atomic_inc_return(&cell_debug_id);
+ trace_afs_cell(cell->debug_id, 1, 0, afs_cell_trace_alloc);
_leave(" = %p", cell);
return cell;
@@ -236,7 +241,7 @@ struct afs_cell *afs_lookup_cell(struct afs_net *net,
_enter("%s,%s", name, vllist);
if (!excl) {
- cell = afs_find_cell(net, name, namesz);
+ cell = afs_find_cell(net, name, namesz, afs_cell_trace_use_lookup);
if (!IS_ERR(cell))
goto wait_for_cell;
}
@@ -280,13 +285,16 @@ struct afs_cell *afs_lookup_cell(struct afs_net *net,
cell = candidate;
candidate = NULL;
atomic_set(&cell->active, 2);
+ trace_afs_cell(cell->debug_id, atomic_read(&cell->ref), 2, afs_cell_trace_insert);
rb_link_node_rcu(&cell->net_node, parent, pp);
rb_insert_color(&cell->net_node, &net->cells);
up_write(&net->cells_lock);
- afs_queue_cell(cell);
+ afs_queue_cell(cell, afs_cell_trace_get_queue_new);
wait_for_cell:
+ trace_afs_cell(cell->debug_id, atomic_read(&cell->ref), atomic_read(&cell->active),
+ afs_cell_trace_wait);
_debug("wait_for_cell");
wait_var_event(&cell->state,
({
@@ -309,17 +317,17 @@ cell_already_exists:
if (excl) {
ret = -EEXIST;
} else {
- afs_use_cell(cursor);
+ afs_use_cell(cursor, afs_cell_trace_use_lookup);
ret = 0;
}
up_write(&net->cells_lock);
if (candidate)
- afs_put_cell(candidate);
+ afs_put_cell(candidate, afs_cell_trace_put_candidate);
if (ret == 0)
goto wait_for_cell;
goto error_noput;
error:
- afs_unuse_cell(net, cell);
+ afs_unuse_cell(net, cell, afs_cell_trace_unuse_lookup);
error_noput:
_leave(" = %d [error]", ret);
return ERR_PTR(ret);
@@ -364,15 +372,16 @@ int afs_cell_init(struct afs_net *net, const char *rootcell)
}
if (!test_and_set_bit(AFS_CELL_FL_NO_GC, &new_root->flags))
- afs_use_cell(new_root);
+ afs_use_cell(new_root, afs_cell_trace_use_pin);
/* install the new cell */
down_write(&net->cells_lock);
+ afs_see_cell(new_root, afs_cell_trace_see_ws);
old_root = net->ws_cell;
net->ws_cell = new_root;
up_write(&net->cells_lock);
- afs_unuse_cell(net, old_root);
+ afs_unuse_cell(net, old_root, afs_cell_trace_unuse_ws);
_leave(" = 0");
return 0;
}
@@ -485,9 +494,10 @@ static void afs_cell_destroy(struct rcu_head *rcu)
u = atomic_read(&cell->ref);
ASSERTCMP(u, ==, 0);
+ trace_afs_cell(cell->debug_id, u, atomic_read(&cell->active), afs_cell_trace_free);
afs_put_vlserverlist(net, rcu_access_pointer(cell->vl_servers));
- afs_unuse_cell(net, cell->alias_of);
+ afs_unuse_cell(net, cell->alias_of, afs_cell_trace_unuse_alias);
key_put(cell->anonymous_key);
kfree(cell->name);
kfree(cell);
@@ -525,24 +535,30 @@ void afs_cells_timer(struct timer_list *timer)
/*
* Get a reference on a cell record.
*/
-struct afs_cell *afs_get_cell(struct afs_cell *cell)
+struct afs_cell *afs_get_cell(struct afs_cell *cell, enum afs_cell_trace reason)
{
+ int u;
+
if (atomic_read(&cell->ref) <= 0)
BUG();
- atomic_inc(&cell->ref);
+ u = atomic_inc_return(&cell->ref);
+ trace_afs_cell(cell->debug_id, u, atomic_read(&cell->active), reason);
return cell;
}
/*
* Drop a reference on a cell record.
*/
-void afs_put_cell(struct afs_cell *cell)
+void afs_put_cell(struct afs_cell *cell, enum afs_cell_trace reason)
{
if (cell) {
+ unsigned int debug_id = cell->debug_id;
unsigned int u, a;
+ a = atomic_read(&cell->active);
u = atomic_dec_return(&cell->ref);
+ trace_afs_cell(debug_id, u, a, reason);
if (u == 0) {
a = atomic_read(&cell->active);
WARN(a != 0, "Cell active count %u > 0\n", a);
@@ -554,12 +570,16 @@ void afs_put_cell(struct afs_cell *cell)
/*
* Note a cell becoming more active.
*/
-struct afs_cell *afs_use_cell(struct afs_cell *cell)
+struct afs_cell *afs_use_cell(struct afs_cell *cell, enum afs_cell_trace reason)
{
+ int u, a;
+
if (atomic_read(&cell->ref) <= 0)
BUG();
- atomic_inc(&cell->active);
+ u = atomic_read(&cell->ref);
+ a = atomic_inc_return(&cell->active);
+ trace_afs_cell(cell->debug_id, u, a, reason);
return cell;
}
@@ -567,10 +587,11 @@ struct afs_cell *afs_use_cell(struct afs_cell *cell)
* Record a cell becoming less active. When the active counter reaches 1, it
* is scheduled for destruction, but may get reactivated.
*/
-void afs_unuse_cell(struct afs_net *net, struct afs_cell *cell)
+void afs_unuse_cell(struct afs_net *net, struct afs_cell *cell, enum afs_cell_trace reason)
{
+ unsigned int debug_id = cell->debug_id;
time64_t now, expire_delay;
- int a;
+ int u, a;
if (!cell)
return;
@@ -583,7 +604,9 @@ void afs_unuse_cell(struct afs_net *net, struct afs_cell *cell)
if (cell->vl_servers->nr_servers)
expire_delay = afs_cell_gc_delay;
+ u = atomic_read(&cell->ref);
a = atomic_dec_return(&cell->active);
+ trace_afs_cell(debug_id, u, a, reason);
WARN_ON(a == 0);
if (a == 1)
/* 'cell' may now be garbage collected. */
@@ -591,13 +614,25 @@ void afs_unuse_cell(struct afs_net *net, struct afs_cell *cell)
}
/*
+ * Note that a cell has been seen.
+ */
+void afs_see_cell(struct afs_cell *cell, enum afs_cell_trace reason)
+{
+ int u, a;
+
+ u = atomic_read(&cell->ref);
+ a = atomic_read(&cell->active);
+ trace_afs_cell(cell->debug_id, u, a, reason);
+}
+
+/*
* Queue a cell for management, giving the workqueue a ref to hold.
*/
-void afs_queue_cell(struct afs_cell *cell)
+void afs_queue_cell(struct afs_cell *cell, enum afs_cell_trace reason)
{
- afs_get_cell(cell);
+ afs_get_cell(cell, reason);
if (!queue_work(afs_wq, &cell->manager))
- afs_put_cell(cell);
+ afs_put_cell(cell, afs_cell_trace_put_queue_fail);
}
/*
@@ -713,6 +748,8 @@ again:
active = 1;
if (atomic_try_cmpxchg_relaxed(&cell->active, &active, 0)) {
rb_erase(&cell->net_node, &net->cells);
+ trace_afs_cell(cell->debug_id, atomic_read(&cell->ref), 0,
+ afs_cell_trace_unuse_delete);
smp_store_release(&cell->state, AFS_CELL_REMOVED);
}
up_write(&net->cells_lock);
@@ -792,7 +829,7 @@ final_destruction:
/* The root volume is pinning the cell */
afs_put_volume(cell->net, cell->root_volume, afs_volume_trace_put_cell_root);
cell->root_volume = NULL;
- afs_put_cell(cell);
+ afs_put_cell(cell, afs_cell_trace_put_destroy);
}
static void afs_manage_cell_work(struct work_struct *work)
@@ -800,7 +837,7 @@ static void afs_manage_cell_work(struct work_struct *work)
struct afs_cell *cell = container_of(work, struct afs_cell, manager);
afs_manage_cell(cell);
- afs_put_cell(cell);
+ afs_put_cell(cell, afs_cell_trace_put_queue_work);
}
/*
@@ -838,13 +875,17 @@ void afs_manage_cells(struct work_struct *work)
bool sched_cell = false;
active = atomic_read(&cell->active);
- _debug("manage %s %u %u", cell->name, atomic_read(&cell->ref), active);
+ trace_afs_cell(cell->debug_id, atomic_read(&cell->ref),
+ active, afs_cell_trace_manage);
ASSERTCMP(active, >=, 1);
if (purging) {
- if (test_and_clear_bit(AFS_CELL_FL_NO_GC, &cell->flags))
- atomic_dec(&cell->active);
+ if (test_and_clear_bit(AFS_CELL_FL_NO_GC, &cell->flags)) {
+ active = atomic_dec_return(&cell->active);
+ trace_afs_cell(cell->debug_id, atomic_read(&cell->ref),
+ active, afs_cell_trace_unuse_pin);
+ }
}
if (active == 1) {
@@ -870,7 +911,7 @@ void afs_manage_cells(struct work_struct *work)
}
if (sched_cell)
- afs_queue_cell(cell);
+ afs_queue_cell(cell, afs_cell_trace_get_queue_manage);
}
up_read(&net->cells_lock);
@@ -907,7 +948,7 @@ void afs_cell_purge(struct afs_net *net)
ws = net->ws_cell;
net->ws_cell = NULL;
up_write(&net->cells_lock);
- afs_unuse_cell(net, ws);
+ afs_unuse_cell(net, ws, afs_cell_trace_unuse_ws);
_debug("del timer");
if (del_timer_sync(&net->cells_timer))
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-13 16:35:14 +0000