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fscache fixes

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Merge tag 'fscache-fixes-20220809' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull fscache updates from David Howells:

 - Fix a cookie access ref leak if a cookie is invalidated a second time
   before the first invalidation is actually processed.

 - Add a tracepoint to log cookie lookup failure

* tag 'fscache-fixes-20220809' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  fscache: add tracepoint when failing cookie
  fscache: don't leak cookie access refs if invalidation is in progress or failed
This commit is contained in:
Linus Torvalds 2022-08-09 10:11:56 -07:00
commit 15205c2829
2 changed files with 9 additions and 2 deletions
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7
fs/fscache/cookie.c
View File

@ -263,6 +263,8 @@ void fscache_caching_failed(struct fscache_cookie *cookie)
{
clear_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags);
fscache_set_cookie_state(cookie, FSCACHE_COOKIE_STATE_FAILED);
trace_fscache_cookie(cookie->debug_id, refcount_read(&cookie->ref),
fscache_cookie_failed);
}
EXPORT_SYMBOL(fscache_caching_failed);
@ -739,6 +741,9 @@ again_locked:
fallthrough;
case FSCACHE_COOKIE_STATE_FAILED:
if (test_and_clear_bit(FSCACHE_COOKIE_DO_INVALIDATE, &cookie->flags))
fscache_end_cookie_access(cookie, fscache_access_invalidate_cookie_end);
if (atomic_read(&cookie->n_accesses) != 0)
break;
if (test_bit(FSCACHE_COOKIE_DO_RELINQUISH, &cookie->flags)) {
@ -1063,8 +1068,8 @@ void __fscache_invalidate(struct fscache_cookie *cookie,
return;
case FSCACHE_COOKIE_STATE_LOOKING_UP:
if (!test_and_set_bit(FSCACHE_COOKIE_DO_INVALIDATE, &cookie->flags))
__fscache_begin_cookie_access(cookie, fscache_access_invalidate_cookie);
set_bit(FSCACHE_COOKIE_DO_INVALIDATE, &cookie->flags);
fallthrough;
case FSCACHE_COOKIE_STATE_CREATING:
spin_unlock(&cookie->lock);

2
include/trace/events/fscache.h
View File

@ -49,6 +49,7 @@ enum fscache_volume_trace {
enum fscache_cookie_trace {
fscache_cookie_collision,
fscache_cookie_discard,
fscache_cookie_failed,
fscache_cookie_get_attach_object,
fscache_cookie_get_end_access,
fscache_cookie_get_hash_collision,
@ -131,6 +132,7 @@ enum fscache_access_trace {
#define fscache_cookie_traces \
EM(fscache_cookie_collision, "*COLLIDE*") \
EM(fscache_cookie_discard, "DISCARD ") \
EM(fscache_cookie_failed, "FAILED ") \
EM(fscache_cookie_get_attach_object, "GET attch") \
EM(fscache_cookie_get_hash_collision, "GET hcoll") \
EM(fscache_cookie_get_end_access, "GQ endac") \