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afs: Add a tracepoint to track the lifetime of the afs_volume struct

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Add a tracepoint to track the lifetime of the afs_volume struct.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2020-04-29 17:02:04 +01:00
parent 6dfdf5369c
commit cca37d45d5
7 changed files with 95 additions and 23 deletions
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2
fs/afs/cell.c
View File

@ -482,7 +482,7 @@ static void afs_cell_destroy(struct rcu_head *rcu)
ASSERTCMP(atomic_read(&cell->usage), ==, 0);
afs_put_volume(cell->net, cell->root_volume);
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);
key_put(cell->anonymous_key);

4
fs/afs/fs_operation.c
View File

@ -36,7 +36,7 @@ struct afs_operation *afs_alloc_operation(struct key *key, struct afs_volume *vo
}
op->key = key;
op->volume = afs_get_volume(volume);
op->volume = afs_get_volume(volume, afs_volume_trace_get_new_op);
op->net = volume->cell->net;
op->cb_v_break = volume->cb_v_break;
op->debug_id = atomic_inc_return(&afs_operation_debug_counter);
@ -233,7 +233,7 @@ int afs_put_operation(struct afs_operation *op)
afs_end_cursor(&op->ac);
afs_put_cb_interest(op->net, op->cbi);
afs_put_serverlist(op->net, op->server_list);
afs_put_volume(op->net, op->volume);
afs_put_volume(op->net, op->volume, afs_volume_trace_put_put_op);
kfree(op);
return ret;
}

10
fs/afs/internal.h
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@ -1429,17 +1429,11 @@ extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
/*
* volume.c
*/
static inline struct afs_volume *afs_get_volume(struct afs_volume *volume)
{
if (volume)
atomic_inc(&volume->usage);
return volume;
}
extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
extern void afs_activate_volume(struct afs_volume *);
extern void afs_deactivate_volume(struct afs_volume *);
extern void afs_put_volume(struct afs_net *, struct afs_volume *);
extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace);
extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
/*

10
fs/afs/super.c
View File

@ -376,7 +376,8 @@ static int afs_validate_fc(struct fs_context *fc)
ctx->key = key;
if (ctx->volume) {
afs_put_volume(ctx->net, ctx->volume);
afs_put_volume(ctx->net, ctx->volume,
afs_volume_trace_put_validate_fc);
ctx->volume = NULL;
}
@ -507,7 +508,8 @@ static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc)
as->dyn_root = true;
} else {
as->cell = afs_get_cell(ctx->cell);
as->volume = afs_get_volume(ctx->volume);
as->volume = afs_get_volume(ctx->volume,
afs_volume_trace_get_alloc_sbi);
}
}
return as;
@ -517,7 +519,7 @@ 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_put_volume(net, as->volume, afs_volume_trace_put_destroy_sbi);
afs_put_cell(net, as->cell);
put_net(as->net_ns);
kfree(as);
@ -605,7 +607,7 @@ static void afs_free_fc(struct fs_context *fc)
struct afs_fs_context *ctx = fc->fs_private;
afs_destroy_sbi(fc->s_fs_info);
afs_put_volume(ctx->net, ctx->volume);
afs_put_volume(ctx->net, ctx->volume, afs_volume_trace_put_free_fc);
afs_put_cell(ctx->net, ctx->cell);
key_put(ctx->key);
kfree(ctx);

9
fs/afs/vl_alias.c
View File

@ -193,7 +193,8 @@ static int afs_query_for_alias_one(struct afs_cell *cell, struct key *key,
read_lock(&p->proc_lock);
if (!list_empty(&p->proc_volumes))
pvol = afs_get_volume(list_first_entry(&p->proc_volumes,
struct afs_volume, proc_link));
struct afs_volume, proc_link),
afs_volume_trace_get_query_alias);
read_unlock(&p->proc_lock);
if (!pvol)
return 0;
@ -203,7 +204,7 @@ static int afs_query_for_alias_one(struct afs_cell *cell, struct key *key,
/* And see if it's in the new cell. */
volume = afs_sample_volume(cell, key, pvol->name, pvol->name_len);
if (IS_ERR(volume)) {
afs_put_volume(cell->net, pvol);
afs_put_volume(cell->net, pvol, afs_volume_trace_put_query_alias);
if (PTR_ERR(volume) != -ENOMEDIUM)
return PTR_ERR(volume);
/* That volume is not in the new cell, so not an alias */
@ -221,8 +222,8 @@ static int afs_query_for_alias_one(struct afs_cell *cell, struct key *key,
rcu_read_unlock();
}
afs_put_volume(cell->net, volume);
afs_put_volume(cell->net, pvol);
afs_put_volume(cell->net, volume, afs_volume_trace_put_query_alias);
afs_put_volume(cell->net, pvol, afs_volume_trace_put_query_alias);
return ret;
}

27
fs/afs/volume.c
View File

@ -52,6 +52,7 @@ static struct afs_volume *afs_alloc_volume(struct afs_fs_context *params,
refcount_set(&slist->usage, 1);
rcu_assign_pointer(volume->servers, slist);
trace_afs_volume(volume->vid, 1, afs_volume_trace_alloc);
return volume;
error_1:
@ -158,20 +159,38 @@ static void afs_destroy_volume(struct afs_net *net, struct afs_volume *volume)
afs_put_serverlist(net, rcu_access_pointer(volume->servers));
afs_put_cell(net, volume->cell);
trace_afs_volume(volume->vid, atomic_read(&volume->usage),
afs_volume_trace_free);
kfree(volume);
_leave(" [destroyed]");
}
/*
* Drop a reference on a volume record.
* Get a reference on a volume record.
*/
void afs_put_volume(struct afs_net *net, struct afs_volume *volume)
struct afs_volume *afs_get_volume(struct afs_volume *volume,
enum afs_volume_trace reason)
{
if (volume) {
_enter("%s", volume->name);
int u = atomic_inc_return(&volume->usage);
trace_afs_volume(volume->vid, u, reason);
}
return volume;
}
if (atomic_dec_and_test(&volume->usage))
/*
* Drop a reference on a volume record.
*/
void afs_put_volume(struct afs_net *net, struct afs_volume *volume,
enum afs_volume_trace reason)
{
if (volume) {
afs_volid_t vid = volume->vid;
int u = atomic_dec_return(&volume->usage);
trace_afs_volume(vid, u, reason);
if (u == 0)
afs_destroy_volume(net, volume);
}
}

56
include/trace/events/afs.h
View File

@ -50,6 +50,23 @@ enum afs_server_trace {
afs_server_trace_update,
};
enum afs_volume_trace {
afs_volume_trace_alloc,
afs_volume_trace_free,
afs_volume_trace_get_alloc_sbi,
afs_volume_trace_get_cell_insert,
afs_volume_trace_get_new_op,
afs_volume_trace_get_query_alias,
afs_volume_trace_put_cell_dup,
afs_volume_trace_put_cell_root,
afs_volume_trace_put_destroy_sbi,
afs_volume_trace_put_free_fc,
afs_volume_trace_put_put_op,
afs_volume_trace_put_query_alias,
afs_volume_trace_put_validate_fc,
afs_volume_trace_remove,
};
enum afs_fs_operation {
afs_FS_FetchData = 130, /* AFS Fetch file data */
afs_FS_FetchACL = 131, /* AFS Fetch file ACL */
@ -262,6 +279,22 @@ enum afs_cb_break_reason {
EM(afs_server_trace_put_uuid_rsq, "PUT u-req") \
E_(afs_server_trace_update, "UPDATE")
#define afs_volume_traces \
EM(afs_volume_trace_alloc, "ALLOC ") \
EM(afs_volume_trace_free, "FREE ") \
EM(afs_volume_trace_get_alloc_sbi, "GET sbi-alloc ") \
EM(afs_volume_trace_get_cell_insert, "GET cell-insrt") \
EM(afs_volume_trace_get_new_op, "GET op-new ") \
EM(afs_volume_trace_get_query_alias, "GET cell-alias") \
EM(afs_volume_trace_put_cell_dup, "PUT cell-dup ") \
EM(afs_volume_trace_put_cell_root, "PUT cell-root ") \
EM(afs_volume_trace_put_destroy_sbi, "PUT sbi-destry") \
EM(afs_volume_trace_put_free_fc, "PUT fc-free ") \
EM(afs_volume_trace_put_put_op, "PUT op-put ") \
EM(afs_volume_trace_put_query_alias, "PUT cell-alias") \
EM(afs_volume_trace_put_validate_fc, "PUT fc-validat") \
E_(afs_volume_trace_remove, "REMOVE ")
#define afs_fs_operations \
EM(afs_FS_FetchData, "FS.FetchData") \
EM(afs_FS_FetchStatus, "FS.FetchStatus") \
@ -1302,6 +1335,29 @@ TRACE_EVENT(afs_server,
__entry->active)
);
TRACE_EVENT(afs_volume,
TP_PROTO(afs_volid_t vid, int ref, enum afs_volume_trace reason),
TP_ARGS(vid, ref, reason),
TP_STRUCT__entry(
__field(afs_volid_t, vid )
__field(int, ref )
__field(enum afs_volume_trace, reason )
),
TP_fast_assign(
__entry->vid = vid;
__entry->ref = ref;
__entry->reason = reason;
),
TP_printk("V=%llx %s u=%d",
__entry->vid,
__print_symbolic(__entry->reason, afs_volume_traces),
__entry->ref)
);
#endif /* _TRACE_AFS_H */
/* This part must be outside protection */