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f5241e4127
Factor out the debug code for rw filesystem refs into a small library. In release mode an enumerated ref is a normal percpu refcount, but in debug mode all enumerated users of the ref get their own atomic_long_t ref - making it much easier to chase down refcount usage bugs for when a refcount has many users. For debugging, we have enumerated_ref_to_text(), which prints the current value of each different user. Additionally, in debug mode enumerated_ref_stop() has a 10 second timeout, after which it will dump outstanding refcounts. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_ENUMERATED_REF_H
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#define _BCACHEFS_ENUMERATED_REF_H
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#include "enumerated_ref_types.h"
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/*
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* A refcount where the users are enumerated: in debug mode, we create sepate
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* refcounts for each user, to make leaks and refcount errors easy to track
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* down:
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*/
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#ifdef ENUMERATED_REF_DEBUG
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void enumerated_ref_get(struct enumerated_ref *, unsigned);
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bool __enumerated_ref_tryget(struct enumerated_ref *, unsigned);
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bool enumerated_ref_tryget(struct enumerated_ref *, unsigned);
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void enumerated_ref_put(struct enumerated_ref *, unsigned);
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#else
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static inline void enumerated_ref_get(struct enumerated_ref *ref, unsigned idx)
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{
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percpu_ref_get(&ref->ref);
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}
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static inline bool __enumerated_ref_tryget(struct enumerated_ref *ref, unsigned idx)
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{
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return percpu_ref_tryget(&ref->ref);
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}
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static inline bool enumerated_ref_tryget(struct enumerated_ref *ref, unsigned idx)
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{
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return percpu_ref_tryget_live(&ref->ref);
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}
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static inline void enumerated_ref_put(struct enumerated_ref *ref, unsigned idx)
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{
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percpu_ref_put(&ref->ref);
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}
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#endif
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static inline bool enumerated_ref_is_zero(struct enumerated_ref *ref)
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{
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#ifndef ENUMERATED_REF_DEBUG
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return percpu_ref_is_zero(&ref->ref);
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#else
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for (unsigned i = 0; i < ref->nr; i++)
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if (atomic_long_read(&ref->refs[i]))
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return false;
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return true;
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#endif
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}
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void enumerated_ref_stop_async(struct enumerated_ref *);
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void enumerated_ref_stop(struct enumerated_ref *, const char * const[]);
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void enumerated_ref_start(struct enumerated_ref *);
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void enumerated_ref_exit(struct enumerated_ref *);
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int enumerated_ref_init(struct enumerated_ref *, unsigned,
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void (*stop_fn)(struct enumerated_ref *));
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struct printbuf;
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void enumerated_ref_to_text(struct printbuf *,
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struct enumerated_ref *,
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const char * const[]);
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#endif /* _BCACHEFS_ENUMERATED_REF_H */
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