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Merge fad70111d5 ("Merge tag 'afs-fixes-20201016' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs") into android-mainline

Browse Source 
Steps on the way to 5.10-rc1

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ibe83dc01d469951189e54cb8f930cb0020295017
This commit is contained in:
Greg Kroah-Hartman
2020-10-26 09:44:28 +01:00
parent 27574f1631 fad70111d5
commit d131e058e3
12 changed files with 377 additions and 171 deletions
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326
fs/afs/cell.c
View File

@@ -18,8 +18,10 @@
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_manage_cell(struct work_struct *);
static void afs_queue_cell_manager(struct afs_net *);
static void afs_manage_cell_work(struct work_struct *);
static void afs_dec_cells_outstanding(struct afs_net *net)
{
@@ -37,19 +39,22 @@ static void afs_set_cell_timer(struct afs_net *net, time64_t delay)
atomic_inc(&net->cells_outstanding);
if (timer_reduce(&net->cells_timer, jiffies + delay * HZ))
afs_dec_cells_outstanding(net);
} else {
afs_queue_cell_manager(net);
}
}
/*
* Look up and get an activation reference on a cell record under RCU
* conditions. The caller must hold the RCU read lock.
* Look up and get an activation reference on a cell record. The caller must
* hold net->cells_lock at least read-locked.
*/
struct afs_cell *afs_lookup_cell_rcu(struct afs_net *net,
const char *name, unsigned int namesz)
static struct afs_cell *afs_find_cell_locked(struct afs_net *net,
const char *name, unsigned int namesz,
enum afs_cell_trace reason)
{
struct afs_cell *cell = NULL;
struct rb_node *p;
int n, seq = 0, ret = 0;
int n;
_enter("%*.*s", namesz, namesz, name);
@@ -58,61 +63,48 @@ struct afs_cell *afs_lookup_cell_rcu(struct afs_net *net,
if (namesz > AFS_MAXCELLNAME)
return ERR_PTR(-ENAMETOOLONG);
do {
/* Unfortunately, rbtree walking doesn't give reliable results
* under just the RCU read lock, so we have to check for
* changes.
*/
if (cell)
afs_put_cell(net, cell);
cell = NULL;
ret = -ENOENT;
if (!name) {
cell = net->ws_cell;
if (!cell)
return ERR_PTR(-EDESTADDRREQ);
goto found;
}
read_seqbegin_or_lock(&net->cells_lock, &seq);
p = net->cells.rb_node;
while (p) {
cell = rb_entry(p, struct afs_cell, net_node);
if (!name) {
cell = rcu_dereference_raw(net->ws_cell);
if (cell) {
afs_get_cell(cell);
ret = 0;
break;
}
ret = -EDESTADDRREQ;
continue;
}
n = strncasecmp(cell->name, name,
min_t(size_t, cell->name_len, namesz));
if (n == 0)
n = cell->name_len - namesz;
if (n < 0)
p = p->rb_left;
else if (n > 0)
p = p->rb_right;
else
goto found;
}
p = rcu_dereference_raw(net->cells.rb_node);
while (p) {
cell = rb_entry(p, struct afs_cell, net_node);
return ERR_PTR(-ENOENT);
n = strncasecmp(cell->name, name,
min_t(size_t, cell->name_len, namesz));
if (n == 0)
n = cell->name_len - namesz;
if (n < 0) {
p = rcu_dereference_raw(p->rb_left);
} else if (n > 0) {
p = rcu_dereference_raw(p->rb_right);
} else {
if (atomic_inc_not_zero(&cell->usage)) {
ret = 0;
break;
}
/* We want to repeat the search, this time with
* the lock properly locked.
*/
}
cell = NULL;
}
found:
return afs_use_cell(cell, reason);
}
} while (need_seqretry(&net->cells_lock, seq));
/*
* 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,
enum afs_cell_trace reason)
{
struct afs_cell *cell;
done_seqretry(&net->cells_lock, seq);
if (ret != 0 && cell)
afs_put_cell(net, cell);
return ret == 0 ? cell : ERR_PTR(ret);
down_read(&net->cells_lock);
cell = afs_find_cell_locked(net, name, namesz, reason);
up_read(&net->cells_lock);
return cell;
}
/*
@@ -166,8 +158,9 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
cell->name[i] = tolower(name[i]);
cell->name[i] = 0;
atomic_set(&cell->usage, 2);
INIT_WORK(&cell->manager, afs_manage_cell);
atomic_set(&cell->ref, 1);
atomic_set(&cell->active, 0);
INIT_WORK(&cell->manager, afs_manage_cell_work);
cell->volumes = RB_ROOT;
INIT_HLIST_HEAD(&cell->proc_volumes);
seqlock_init(&cell->volume_lock);
@@ -206,6 +199,9 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
cell->dns_source = vllist->source;
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;
@@ -245,9 +241,7 @@ struct afs_cell *afs_lookup_cell(struct afs_net *net,
_enter("%s,%s", name, vllist);
if (!excl) {
rcu_read_lock();
cell = afs_lookup_cell_rcu(net, name, namesz);
rcu_read_unlock();
cell = afs_find_cell(net, name, namesz, afs_cell_trace_use_lookup);
if (!IS_ERR(cell))
goto wait_for_cell;
}
@@ -268,7 +262,7 @@ struct afs_cell *afs_lookup_cell(struct afs_net *net,
/* Find the insertion point and check to see if someone else added a
* cell whilst we were allocating.
*/
write_seqlock(&net->cells_lock);
down_write(&net->cells_lock);
pp = &net->cells.rb_node;
parent = NULL;
@@ -290,23 +284,26 @@ 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);
atomic_inc(&net->cells_outstanding);
write_sequnlock(&net->cells_lock);
up_write(&net->cells_lock);
queue_work(afs_wq, &cell->manager);
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,
({
state = smp_load_acquire(&cell->state); /* vs error */
state == AFS_CELL_ACTIVE || state == AFS_CELL_FAILED;
state == AFS_CELL_ACTIVE || state == AFS_CELL_REMOVED;
}));
/* Check the state obtained from the wait check. */
if (state == AFS_CELL_FAILED) {
if (state == AFS_CELL_REMOVED) {
ret = cell->error;
goto error;
}
@@ -320,16 +317,17 @@ cell_already_exists:
if (excl) {
ret = -EEXIST;
} else {
afs_get_cell(cursor);
afs_use_cell(cursor, afs_cell_trace_use_lookup);
ret = 0;
}
write_sequnlock(&net->cells_lock);
kfree(candidate);
up_write(&net->cells_lock);
if (candidate)
afs_put_cell(candidate, afs_cell_trace_put_candidate);
if (ret == 0)
goto wait_for_cell;
goto error_noput;
error:
afs_put_cell(net, cell);
afs_unuse_cell(net, cell, afs_cell_trace_unuse_lookup);
error_noput:
_leave(" = %d [error]", ret);
return ERR_PTR(ret);
@@ -374,15 +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_get_cell(new_root);
afs_use_cell(new_root, afs_cell_trace_use_pin);
/* install the new cell */
write_seqlock(&net->cells_lock);
old_root = rcu_access_pointer(net->ws_cell);
rcu_assign_pointer(net->ws_cell, new_root);
write_sequnlock(&net->cells_lock);
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_put_cell(net, old_root);
afs_unuse_cell(net, old_root, afs_cell_trace_unuse_ws);
_leave(" = 0");
return 0;
}
@@ -488,18 +487,22 @@ out_wake:
static void afs_cell_destroy(struct rcu_head *rcu)
{
struct afs_cell *cell = container_of(rcu, struct afs_cell, rcu);
struct afs_net *net = cell->net;
int u;
_enter("%p{%s}", cell, cell->name);
ASSERTCMP(atomic_read(&cell->usage), ==, 0);
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_volume(cell->net, cell->root_volume, afs_volume_trace_put_cell_root);
afs_put_vlserverlist(cell->net, rcu_access_pointer(cell->vl_servers));
afs_put_cell(cell->net, cell->alias_of);
afs_put_vlserverlist(net, rcu_access_pointer(cell->vl_servers));
afs_unuse_cell(net, cell->alias_of, afs_cell_trace_unuse_alias);
key_put(cell->anonymous_key);
kfree(cell->name);
kfree(cell);
afs_dec_cells_outstanding(net);
_leave(" [destroyed]");
}
@@ -532,18 +535,63 @@ 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)
{
atomic_inc(&cell->usage);
int u;
if (atomic_read(&cell->ref) <= 0)
BUG();
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_net *net, 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);
call_rcu(&cell->rcu, afs_cell_destroy);
}
}
}
/*
* Note a cell becoming more active.
*/
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();
u = atomic_read(&cell->ref);
a = atomic_inc_return(&cell->active);
trace_afs_cell(cell->debug_id, u, a, reason);
return 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, enum afs_cell_trace reason)
{
unsigned int debug_id = cell->debug_id;
time64_t now, expire_delay;
int u, a;
if (!cell)
return;
@@ -556,11 +604,35 @@ void afs_put_cell(struct afs_net *net, struct afs_cell *cell)
if (cell->vl_servers->nr_servers)
expire_delay = afs_cell_gc_delay;
if (atomic_dec_return(&cell->usage) > 1)
return;
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. */
afs_set_cell_timer(net, expire_delay);
}
/* 'cell' may now be garbage collected. */
afs_set_cell_timer(net, expire_delay);
/*
* 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, enum afs_cell_trace reason)
{
afs_get_cell(cell, reason);
if (!queue_work(afs_wq, &cell->manager))
afs_put_cell(cell, afs_cell_trace_put_queue_fail);
}
/*
@@ -660,12 +732,10 @@ static void afs_deactivate_cell(struct afs_net *net, struct afs_cell *cell)
* Manage a cell record, initialising and destroying it, maintaining its DNS
* records.
*/
static void afs_manage_cell(struct work_struct *work)
static void afs_manage_cell(struct afs_cell *cell)
{
struct afs_cell *cell = container_of(work, struct afs_cell, manager);
struct afs_net *net = cell->net;
bool deleted;
int ret, usage;
int ret, active;
_enter("%s", cell->name);
@@ -674,14 +744,19 @@ again:
switch (cell->state) {
case AFS_CELL_INACTIVE:
case AFS_CELL_FAILED:
write_seqlock(&net->cells_lock);
usage = 1;
deleted = atomic_try_cmpxchg_relaxed(&cell->usage, &usage, 0);
if (deleted)
down_write(&net->cells_lock);
active = 1;
if (atomic_try_cmpxchg_relaxed(&cell->active, &active, 0)) {
rb_erase(&cell->net_node, &net->cells);
write_sequnlock(&net->cells_lock);
if (deleted)
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);
if (cell->state == AFS_CELL_REMOVED) {
wake_up_var(&cell->state);
goto final_destruction;
}
if (cell->state == AFS_CELL_FAILED)
goto done;
smp_store_release(&cell->state, AFS_CELL_UNSET);
@@ -703,7 +778,7 @@ again:
goto again;
case AFS_CELL_ACTIVE:
if (atomic_read(&cell->usage) > 1) {
if (atomic_read(&cell->active) > 1) {
if (test_and_clear_bit(AFS_CELL_FL_DO_LOOKUP, &cell->flags)) {
ret = afs_update_cell(cell);
if (ret < 0)
@@ -716,13 +791,16 @@ again:
goto again;
case AFS_CELL_DEACTIVATING:
if (atomic_read(&cell->usage) > 1)
if (atomic_read(&cell->active) > 1)
goto reverse_deactivation;
afs_deactivate_cell(net, cell);
smp_store_release(&cell->state, AFS_CELL_INACTIVE);
wake_up_var(&cell->state);
goto again;
case AFS_CELL_REMOVED:
goto done;
default:
break;
}
@@ -748,9 +826,18 @@ done:
return;
final_destruction:
call_rcu(&cell->rcu, afs_cell_destroy);
afs_dec_cells_outstanding(net);
_leave(" [destruct %d]", atomic_read(&net->cells_outstanding));
/* 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_cell_trace_put_destroy);
}
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_cell_trace_put_queue_work);
}
/*
@@ -779,26 +866,29 @@ void afs_manage_cells(struct work_struct *work)
* lack of use and cells whose DNS results have expired and dispatch
* their managers.
*/
read_seqlock_excl(&net->cells_lock);
down_read(&net->cells_lock);
for (cursor = rb_first(&net->cells); cursor; cursor = rb_next(cursor)) {
struct afs_cell *cell =
rb_entry(cursor, struct afs_cell, net_node);
unsigned usage;
unsigned active;
bool sched_cell = false;
usage = atomic_read(&cell->usage);
_debug("manage %s %u", cell->name, usage);
active = atomic_read(&cell->active);
trace_afs_cell(cell->debug_id, atomic_read(&cell->ref),
active, afs_cell_trace_manage);
ASSERTCMP(usage, >=, 1);
ASSERTCMP(active, >=, 1);
if (purging) {
if (test_and_clear_bit(AFS_CELL_FL_NO_GC, &cell->flags))
usage = atomic_dec_return(&cell->usage);
ASSERTCMP(usage, ==, 1);
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 (usage == 1) {
if (active == 1) {
struct afs_vlserver_list *vllist;
time64_t expire_at = cell->last_inactive;
@@ -821,10 +911,10 @@ void afs_manage_cells(struct work_struct *work)
}
if (sched_cell)
queue_work(afs_wq, &cell->manager);
afs_queue_cell(cell, afs_cell_trace_get_queue_manage);
}
read_sequnlock_excl(&net->cells_lock);
up_read(&net->cells_lock);
/* Update the timer on the way out. We have to pass an increment on
* cells_outstanding in the namespace that we are in to the timer or
@@ -854,11 +944,11 @@ void afs_cell_purge(struct afs_net *net)
_enter("");
write_seqlock(&net->cells_lock);
ws = rcu_access_pointer(net->ws_cell);
RCU_INIT_POINTER(net->ws_cell, NULL);
write_sequnlock(&net->cells_lock);
afs_put_cell(net, ws);
down_write(&net->cells_lock);
ws = net->ws_cell;
net->ws_cell = NULL;
up_write(&net->cells_lock);
afs_unuse_cell(net, ws, afs_cell_trace_unuse_ws);
_debug("del timer");
if (del_timer_sync(&net->cells_timer))

23
fs/afs/dynroot.c
View File

@@ -123,9 +123,9 @@ static int afs_probe_cell_name(struct dentry *dentry)
len--;
}
cell = afs_lookup_cell_rcu(net, name, len);
cell = afs_find_cell(net, name, len, afs_cell_trace_use_probe);
if (!IS_ERR(cell)) {
afs_put_cell(net, cell);
afs_unuse_cell(net, cell, afs_cell_trace_unuse_probe);
return 0;
}
@@ -179,7 +179,6 @@ static struct dentry *afs_lookup_atcell(struct dentry *dentry)
struct afs_cell *cell;
struct afs_net *net = afs_d2net(dentry);
struct dentry *ret;
unsigned int seq = 0;
char *name;
int len;
@@ -191,17 +190,13 @@ static struct dentry *afs_lookup_atcell(struct dentry *dentry)
if (!name)
goto out_p;
rcu_read_lock();
do {
read_seqbegin_or_lock(&net->cells_lock, &seq);
cell = rcu_dereference_raw(net->ws_cell);
if (cell) {
len = cell->name_len;
memcpy(name, cell->name, len + 1);
}
} while (need_seqretry(&net->cells_lock, seq));
done_seqretry(&net->cells_lock, seq);
rcu_read_unlock();
down_read(&net->cells_lock);
cell = net->ws_cell;
if (cell) {
len = cell->name_len;
memcpy(name, cell->name, len + 1);
}
up_read(&net->cells_lock);
ret = ERR_PTR(-ENOENT);
if (!cell)

20
fs/afs/internal.h
View File

@@ -263,11 +263,11 @@ struct afs_net {
/* Cell database */
struct rb_root cells;
struct afs_cell __rcu *ws_cell;
struct afs_cell *ws_cell;
struct work_struct cells_manager;
struct timer_list cells_timer;
atomic_t cells_outstanding;
seqlock_t cells_lock;
struct rw_semaphore cells_lock;
struct mutex cells_alias_lock;
struct mutex proc_cells_lock;
@@ -326,6 +326,7 @@ enum afs_cell_state {
AFS_CELL_DEACTIVATING,
AFS_CELL_INACTIVE,
AFS_CELL_FAILED,
AFS_CELL_REMOVED,
};
/*
@@ -363,7 +364,8 @@ struct afs_cell {
#endif
time64_t dns_expiry; /* Time AFSDB/SRV record expires */
time64_t last_inactive; /* Time of last drop of usage count */
atomic_t usage;
atomic_t ref; /* Struct refcount */
atomic_t active; /* Active usage counter */
unsigned long flags;
#define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
#define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
@@ -373,6 +375,7 @@ struct afs_cell {
enum dns_record_source dns_source:8; /* Latest source of data from lookup */
enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
unsigned int dns_lookup_count; /* Counter of DNS lookups */
unsigned int debug_id;
/* The volumes belonging to this cell */
struct rb_root volumes; /* Tree of volumes on this server */
@@ -917,11 +920,16 @@ static inline bool afs_cb_is_broken(unsigned int cb_break,
* cell.c
*/
extern int afs_cell_init(struct afs_net *, const char *);
extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned);
extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
enum afs_cell_trace);
extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
const char *, bool);
extern struct afs_cell *afs_get_cell(struct afs_cell *);
extern void afs_put_cell(struct afs_net *, struct afs_cell *);
extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_manage_cells(struct work_struct *);
extern void afs_cells_timer(struct timer_list *);
extern void __net_exit afs_cell_purge(struct afs_net *);

2
fs/afs/main.c
View File

@@ -78,7 +78,7 @@ static int __net_init afs_net_init(struct net *net_ns)
mutex_init(&net->socket_mutex);
net->cells = RB_ROOT;
seqlock_init(&net->cells_lock);
init_rwsem(&net->cells_lock);
INIT_WORK(&net->cells_manager, afs_manage_cells);
timer_setup(&net->cells_timer, afs_cells_timer, 0);

4
fs/afs/mntpt.c
View File

@@ -88,7 +88,7 @@ static int afs_mntpt_set_params(struct fs_context *fc, struct dentry *mntpt)
ctx->force = true;
}
if (ctx->cell) {
afs_put_cell(ctx->net, ctx->cell);
afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_mntpt);
ctx->cell = NULL;
}
if (test_bit(AFS_VNODE_PSEUDODIR, &vnode->flags)) {
@@ -124,7 +124,7 @@ static int afs_mntpt_set_params(struct fs_context *fc, struct dentry *mntpt)
char *buf;
if (src_as->cell)
ctx->cell = afs_get_cell(src_as->cell);
ctx->cell = afs_use_cell(src_as->cell, afs_cell_trace_use_mntpt);
if (size < 2 || size > PAGE_SIZE - 1)
return -EINVAL;

23
fs/afs/proc.c
View File

@@ -38,7 +38,7 @@ static int afs_proc_cells_show(struct seq_file *m, void *v)
if (v == SEQ_START_TOKEN) {
/* display header on line 1 */
seq_puts(m, "USE TTL SV ST NAME\n");
seq_puts(m, "USE ACT TTL SV ST NAME\n");
return 0;
}
@@ -46,10 +46,11 @@ static int afs_proc_cells_show(struct seq_file *m, void *v)
vllist = rcu_dereference(cell->vl_servers);
/* display one cell per line on subsequent lines */
seq_printf(m, "%3u %6lld %2u %2u %s\n",
atomic_read(&cell->usage),
seq_printf(m, "%3u %3u %6lld %2u %2u %s\n",
atomic_read(&cell->ref),
atomic_read(&cell->active),
cell->dns_expiry - ktime_get_real_seconds(),
vllist->nr_servers,
vllist ? vllist->nr_servers : 0,
cell->state,
cell->name);
return 0;
@@ -128,7 +129,7 @@ static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
}
if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
afs_put_cell(net, cell);
afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin);
} else {
goto inval;
}
@@ -154,13 +155,11 @@ static int afs_proc_rootcell_show(struct seq_file *m, void *v)
struct afs_net *net;
net = afs_seq2net_single(m);
if (rcu_access_pointer(net->ws_cell)) {
rcu_read_lock();
cell = rcu_dereference(net->ws_cell);
if (cell)
seq_printf(m, "%s\n", cell->name);
rcu_read_unlock();
}
down_read(&net->cells_lock);
cell = net->ws_cell;
if (cell)
seq_printf(m, "%s\n", cell->name);
up_read(&net->cells_lock);
return 0;
}

7
fs/afs/server.c
View File

@@ -550,7 +550,12 @@ void afs_manage_servers(struct work_struct *work)
_debug("manage %pU %u", &server->uuid, active);
ASSERTIFCMP(purging, active, ==, 0);
if (purging) {
trace_afs_server(server, atomic_read(&server->ref),
active, afs_server_trace_purging);
if (active != 0)
pr_notice("Can't purge s=%08x\n", server->debug_id);
}
if (active == 0) {
time64_t expire_at = server->unuse_time;

18
fs/afs/super.c
View File

@@ -294,7 +294,8 @@ static int afs_parse_source(struct fs_context *fc, struct fs_parameter *param)
cellnamesz, cellnamesz, cellname ?: "");
return PTR_ERR(cell);
}
afs_put_cell(ctx->net, ctx->cell);
afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_parse);
afs_see_cell(cell, afs_cell_trace_see_source);
ctx->cell = cell;
}
@@ -389,8 +390,9 @@ static int afs_validate_fc(struct fs_context *fc)
_debug("switch to alias");
key_put(ctx->key);
ctx->key = NULL;
cell = afs_get_cell(ctx->cell->alias_of);
afs_put_cell(ctx->net, ctx->cell);
cell = afs_use_cell(ctx->cell->alias_of,
afs_cell_trace_use_fc_alias);
afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc);
ctx->cell = cell;
goto reget_key;
}
@@ -507,7 +509,7 @@ static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc)
if (ctx->dyn_root) {
as->dyn_root = true;
} else {
as->cell = afs_get_cell(ctx->cell);
as->cell = afs_use_cell(ctx->cell, afs_cell_trace_use_sbi);
as->volume = afs_get_volume(ctx->volume,
afs_volume_trace_get_alloc_sbi);
}
@@ -520,7 +522,7 @@ static void afs_destroy_sbi(struct afs_super_info *as)
if (as) {
struct afs_net *net = afs_net(as->net_ns);
afs_put_volume(net, as->volume, afs_volume_trace_put_destroy_sbi);
afs_put_cell(net, as->cell);
afs_unuse_cell(net, as->cell, afs_cell_trace_unuse_sbi);
put_net(as->net_ns);
kfree(as);
}
@@ -606,7 +608,7 @@ static void afs_free_fc(struct fs_context *fc)
afs_destroy_sbi(fc->s_fs_info);
afs_put_volume(ctx->net, ctx->volume, afs_volume_trace_put_free_fc);
afs_put_cell(ctx->net, ctx->cell);
afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc);
key_put(ctx->key);
kfree(ctx);
}
@@ -633,9 +635,7 @@ static int afs_init_fs_context(struct fs_context *fc)
ctx->net = afs_net(fc->net_ns);
/* Default to the workstation cell. */
rcu_read_lock();
cell = afs_lookup_cell_rcu(ctx->net, NULL, 0);
rcu_read_unlock();
cell = afs_find_cell(ctx->net, NULL, 0, afs_cell_trace_use_fc);
if (IS_ERR(cell))
cell = NULL;
ctx->cell = cell;

8
fs/afs/vl_alias.c
View File

@@ -177,7 +177,7 @@ static int afs_compare_cell_roots(struct afs_cell *cell)
is_alias:
rcu_read_unlock();
cell->alias_of = afs_get_cell(p);
cell->alias_of = afs_use_cell(p, afs_cell_trace_use_alias);
return 1;
}
@@ -247,18 +247,18 @@ static int afs_query_for_alias(struct afs_cell *cell, struct key *key)
continue;
if (p->root_volume)
continue; /* Ignore cells that have a root.cell volume. */
afs_get_cell(p);
afs_use_cell(p, afs_cell_trace_use_check_alias);
mutex_unlock(&cell->net->proc_cells_lock);
if (afs_query_for_alias_one(cell, key, p) != 0)
goto is_alias;
if (mutex_lock_interruptible(&cell->net->proc_cells_lock) < 0) {
afs_put_cell(cell->net, p);
afs_unuse_cell(cell->net, p, afs_cell_trace_unuse_check_alias);
return -ERESTARTSYS;
}
afs_put_cell(cell->net, p);
afs_unuse_cell(cell->net, p, afs_cell_trace_unuse_check_alias);
}
mutex_unlock(&cell->net->proc_cells_lock);

2
fs/afs/vl_rotate.c
View File

@@ -45,7 +45,7 @@ static bool afs_start_vl_iteration(struct afs_vl_cursor *vc)
cell->dns_expiry <= ktime_get_real_seconds()) {
dns_lookup_count = smp_load_acquire(&cell->dns_lookup_count);
set_bit(AFS_CELL_FL_DO_LOOKUP, &cell->flags);
queue_work(afs_wq, &cell->manager);
afs_queue_cell(cell, afs_cell_trace_get_queue_dns);
if (cell->dns_source == DNS_RECORD_UNAVAILABLE) {
if (wait_var_event_interruptible(

6
fs/afs/volume.c
View File

@@ -83,7 +83,7 @@ static struct afs_volume *afs_alloc_volume(struct afs_fs_context *params,
volume->vid = vldb->vid[params->type];
volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;
volume->cell = afs_get_cell(params->cell);
volume->cell = afs_get_cell(params->cell, afs_cell_trace_get_vol);
volume->type = params->type;
volume->type_force = params->force;
volume->name_len = vldb->name_len;
@@ -106,7 +106,7 @@ static struct afs_volume *afs_alloc_volume(struct afs_fs_context *params,
return volume;
error_1:
afs_put_cell(params->net, volume->cell);
afs_put_cell(volume->cell, afs_cell_trace_put_vol);
kfree(volume);
error_0:
return ERR_PTR(ret);
@@ -228,7 +228,7 @@ static void afs_destroy_volume(struct afs_net *net, struct afs_volume *volume)
afs_remove_volume_from_cell(volume);
afs_put_serverlist(net, rcu_access_pointer(volume->servers));
afs_put_cell(net, volume->cell);
afs_put_cell(volume->cell, afs_cell_trace_put_vol);
trace_afs_volume(volume->vid, atomic_read(&volume->usage),
afs_volume_trace_free);
kfree_rcu(volume, rcu);

109
include/trace/events/afs.h
View File

@@ -40,6 +40,7 @@ enum afs_server_trace {
afs_server_trace_get_new_cbi,
afs_server_trace_get_probe,
afs_server_trace_give_up_cb,
afs_server_trace_purging,
afs_server_trace_put_call,
afs_server_trace_put_cbi,
afs_server_trace_put_find_rsq,
@@ -50,6 +51,7 @@ enum afs_server_trace {
afs_server_trace_update,
};
enum afs_volume_trace {
afs_volume_trace_alloc,
afs_volume_trace_free,
@@ -67,6 +69,46 @@ enum afs_volume_trace {
afs_volume_trace_remove,
};
enum afs_cell_trace {
afs_cell_trace_alloc,
afs_cell_trace_free,
afs_cell_trace_get_queue_dns,
afs_cell_trace_get_queue_manage,
afs_cell_trace_get_queue_new,
afs_cell_trace_get_vol,
afs_cell_trace_insert,
afs_cell_trace_manage,
afs_cell_trace_put_candidate,
afs_cell_trace_put_destroy,
afs_cell_trace_put_queue_fail,
afs_cell_trace_put_queue_work,
afs_cell_trace_put_vol,
afs_cell_trace_see_source,
afs_cell_trace_see_ws,
afs_cell_trace_unuse_alias,
afs_cell_trace_unuse_check_alias,
afs_cell_trace_unuse_delete,
afs_cell_trace_unuse_fc,
afs_cell_trace_unuse_lookup,
afs_cell_trace_unuse_mntpt,
afs_cell_trace_unuse_no_pin,
afs_cell_trace_unuse_parse,
afs_cell_trace_unuse_pin,
afs_cell_trace_unuse_probe,
afs_cell_trace_unuse_sbi,
afs_cell_trace_unuse_ws,
afs_cell_trace_use_alias,
afs_cell_trace_use_check_alias,
afs_cell_trace_use_fc,
afs_cell_trace_use_fc_alias,
afs_cell_trace_use_lookup,
afs_cell_trace_use_mntpt,
afs_cell_trace_use_pin,
afs_cell_trace_use_probe,
afs_cell_trace_use_sbi,
afs_cell_trace_wait,
};
enum afs_fs_operation {
afs_FS_FetchData = 130, /* AFS Fetch file data */
afs_FS_FetchACL = 131, /* AFS Fetch file ACL */
@@ -270,6 +312,7 @@ enum afs_cb_break_reason {
EM(afs_server_trace_get_new_cbi, "GET cbi ") \
EM(afs_server_trace_get_probe, "GET probe") \
EM(afs_server_trace_give_up_cb, "giveup-cb") \
EM(afs_server_trace_purging, "PURGE ") \
EM(afs_server_trace_put_call, "PUT call ") \
EM(afs_server_trace_put_cbi, "PUT cbi ") \
EM(afs_server_trace_put_find_rsq, "PUT f-rsq") \
@@ -295,6 +338,44 @@ enum afs_cb_break_reason {
EM(afs_volume_trace_put_validate_fc, "PUT fc-validat") \
E_(afs_volume_trace_remove, "REMOVE ")
#define afs_cell_traces \
EM(afs_cell_trace_alloc, "ALLOC ") \
EM(afs_cell_trace_free, "FREE ") \
EM(afs_cell_trace_get_queue_dns, "GET q-dns ") \
EM(afs_cell_trace_get_queue_manage, "GET q-mng ") \
EM(afs_cell_trace_get_queue_new, "GET q-new ") \
EM(afs_cell_trace_get_vol, "GET vol ") \
EM(afs_cell_trace_insert, "INSERT ") \
EM(afs_cell_trace_manage, "MANAGE ") \
EM(afs_cell_trace_put_candidate, "PUT candid") \
EM(afs_cell_trace_put_destroy, "PUT destry") \
EM(afs_cell_trace_put_queue_work, "PUT q-work") \
EM(afs_cell_trace_put_queue_fail, "PUT q-fail") \
EM(afs_cell_trace_put_vol, "PUT vol ") \
EM(afs_cell_trace_see_source, "SEE source") \
EM(afs_cell_trace_see_ws, "SEE ws ") \
EM(afs_cell_trace_unuse_alias, "UNU alias ") \
EM(afs_cell_trace_unuse_check_alias, "UNU chk-al") \
EM(afs_cell_trace_unuse_delete, "UNU delete") \
EM(afs_cell_trace_unuse_fc, "UNU fc ") \
EM(afs_cell_trace_unuse_lookup, "UNU lookup") \
EM(afs_cell_trace_unuse_mntpt, "UNU mntpt ") \
EM(afs_cell_trace_unuse_parse, "UNU parse ") \
EM(afs_cell_trace_unuse_pin, "UNU pin ") \
EM(afs_cell_trace_unuse_probe, "UNU probe ") \
EM(afs_cell_trace_unuse_sbi, "UNU sbi ") \
EM(afs_cell_trace_unuse_ws, "UNU ws ") \
EM(afs_cell_trace_use_alias, "USE alias ") \
EM(afs_cell_trace_use_check_alias, "USE chk-al") \
EM(afs_cell_trace_use_fc, "USE fc ") \
EM(afs_cell_trace_use_fc_alias, "USE fc-al ") \
EM(afs_cell_trace_use_lookup, "USE lookup") \
EM(afs_cell_trace_use_mntpt, "USE mntpt ") \
EM(afs_cell_trace_use_pin, "USE pin ") \
EM(afs_cell_trace_use_probe, "USE probe ") \
EM(afs_cell_trace_use_sbi, "USE sbi ") \
E_(afs_cell_trace_wait, "WAIT ")
#define afs_fs_operations \
EM(afs_FS_FetchData, "FS.FetchData") \
EM(afs_FS_FetchStatus, "FS.FetchStatus") \
@@ -483,6 +564,7 @@ enum afs_cb_break_reason {
afs_call_traces;
afs_server_traces;
afs_cell_traces;
afs_fs_operations;
afs_vl_operations;
afs_edit_dir_ops;
@@ -1358,6 +1440,33 @@ TRACE_EVENT(afs_volume,
__entry->ref)
);
TRACE_EVENT(afs_cell,
TP_PROTO(unsigned int cell_debug_id, int usage, int active,
enum afs_cell_trace reason),
TP_ARGS(cell_debug_id, usage, active, reason),
TP_STRUCT__entry(
__field(unsigned int, cell )
__field(int, usage )
__field(int, active )
__field(int, reason )
),
TP_fast_assign(
__entry->cell = cell_debug_id;
__entry->usage = usage;
__entry->active = active;
__entry->reason = reason;
),
TP_printk("L=%08x %s u=%d a=%d",
__entry->cell,
__print_symbolic(__entry->reason, afs_cell_traces),
__entry->usage,
__entry->active)
);
#endif /* _TRACE_AFS_H */
/* This part must be outside protection */