43 	struct pt_section *section;  in pt_mk_section()  local
80 	section = malloc(sizeof(*section));  in pt_mk_section()
81 	if (!section) {  in pt_mk_section()
86 	memset(section, 0, sizeof(*section));  in pt_mk_section()
88 	section->filename = fname;  in pt_mk_section()
89 	section->status = status;  in pt_mk_section()
90 	section->offset = offset;  in pt_mk_section()
91 	section->size = size;  in pt_mk_section()
92 	section->ucount = 1;  in pt_mk_section()
96 	errcode = mtx_init(&section->lock, mtx_plain);  in pt_mk_section()
98 		free(section);  in pt_mk_section()
104 	errcode = mtx_init(&section->alock, mtx_plain);  in pt_mk_section()
106 		mtx_destroy(&section->lock);  in pt_mk_section()
107 		free(section);  in pt_mk_section()
115 	*psection = section;  in pt_mk_section()
126 int pt_section_lock(struct pt_section *section)  in pt_section_lock()  argument
128 	if (!section)  in pt_section_lock()
135 		errcode = mtx_lock(&section->lock);  in pt_section_lock()
144 int pt_section_unlock(struct pt_section *section)  in pt_section_unlock()  argument
146 	if (!section)  in pt_section_unlock()
153 		errcode = mtx_unlock(&section->lock);  in pt_section_unlock()
162 static void pt_section_free(struct pt_section *section)  in pt_section_free()  argument
164 	if (!section)  in pt_section_free()
169 	mtx_destroy(&section->alock);  in pt_section_free()
170 	mtx_destroy(&section->lock);  in pt_section_free()
174 	free(section->filename);  in pt_section_free()
175 	free(section->status);  in pt_section_free()
176 	free(section);  in pt_section_free()
179 int pt_section_get(struct pt_section *section)  in pt_section_get()  argument
184 	if (!section)  in pt_section_get()
187 	errcode = pt_section_lock(section);  in pt_section_get()
191 	ucount = section->ucount + 1;  in pt_section_get()
193 		(void) pt_section_unlock(section);  in pt_section_get()
197 	section->ucount = ucount;  in pt_section_get()
199 	return pt_section_unlock(section);  in pt_section_get()
202 int pt_section_put(struct pt_section *section)  in pt_section_put()  argument
207 	if (!section)  in pt_section_put()
210 	errcode = pt_section_lock(section);  in pt_section_put()
214 	mcount = section->mcount;  in pt_section_put()
215 	ucount = section->ucount;  in pt_section_put()
217 		section->ucount = ucount - 1;  in pt_section_put()
218 		return pt_section_unlock(section);  in pt_section_put()
221 	errcode = pt_section_unlock(section);  in pt_section_put()
228 	pt_section_free(section);  in pt_section_put()
232 static int pt_section_lock_attach(struct pt_section *section)  in pt_section_lock_attach()  argument
234 	if (!section)  in pt_section_lock_attach()
241 		errcode = mtx_lock(&section->alock);  in pt_section_lock_attach()
250 static int pt_section_unlock_attach(struct pt_section *section)  in pt_section_unlock_attach()  argument
252 	if (!section)  in pt_section_unlock_attach()
259 		errcode = mtx_unlock(&section->alock);  in pt_section_unlock_attach()
268 int pt_section_attach(struct pt_section *section,  in pt_section_attach()  argument
274 	if (!section || !iscache)  in pt_section_attach()
277 	errcode = pt_section_lock_attach(section);  in pt_section_attach()
281 	ucount = section->ucount;  in pt_section_attach()
282 	acount = section->acount;  in pt_section_attach()
284 		if (section->iscache || !ucount)  in pt_section_attach()
287 		section->iscache = iscache;  in pt_section_attach()
288 		section->acount = 1;  in pt_section_attach()
290 		return pt_section_unlock_attach(section);  in pt_section_attach()
295 		(void) pt_section_unlock_attach(section);  in pt_section_attach()
302 	if (section->iscache != iscache)  in pt_section_attach()
305 	section->acount = acount;  in pt_section_attach()
307 	return pt_section_unlock_attach(section);  in pt_section_attach()
310 	(void) pt_section_unlock_attach(section);  in pt_section_attach()
314 int pt_section_detach(struct pt_section *section,  in pt_section_detach()  argument
320 	if (!section || !iscache)  in pt_section_detach()
323 	errcode = pt_section_lock_attach(section);  in pt_section_detach()
327 	if (section->iscache != iscache)  in pt_section_detach()
330 	acount = section->acount;  in pt_section_detach()
335 	ucount = section->ucount;  in pt_section_detach()
339 	section->acount = acount;  in pt_section_detach()
341 		section->iscache = NULL;  in pt_section_detach()
343 	return pt_section_unlock_attach(section);  in pt_section_detach()
346 	(void) pt_section_unlock_attach(section);  in pt_section_detach()
350 const char *pt_section_filename(const struct pt_section *section)  in pt_section_filename()  argument
352 	if (!section)  in pt_section_filename()
355 	return section->filename;  in pt_section_filename()
358 uint64_t pt_section_size(const struct pt_section *section)  in pt_section_size()  argument
360 	if (!section)  in pt_section_size()
363 	return section->size;  in pt_section_size()
366 static int pt_section_bcache_memsize(const struct pt_section *section,  in pt_section_bcache_memsize()  argument
371 	if (!section || !psize)  in pt_section_bcache_memsize()
374 	bcache = section->bcache;  in pt_section_bcache_memsize()
386 static int pt_section_memsize_locked(const struct pt_section *section,  in pt_section_memsize_locked()  argument
390 	int (*memsize)(const struct pt_section *section, uint64_t *size);  in pt_section_memsize_locked()
393 	if (!section || !psize)  in pt_section_memsize_locked()
396 	memsize = section->memsize;  in pt_section_memsize_locked()
398 		if (section->mcount)  in pt_section_memsize_locked()
405 	errcode = memsize(section, &msize);  in pt_section_memsize_locked()
409 	errcode = pt_section_bcache_memsize(section, &bcsize);  in pt_section_memsize_locked()
418 int pt_section_memsize(struct pt_section *section, uint64_t *size)  in pt_section_memsize()  argument
422 	errcode = pt_section_lock(section);  in pt_section_memsize()
426 	status = pt_section_memsize_locked(section, size);  in pt_section_memsize()
428 	errcode = pt_section_unlock(section);  in pt_section_memsize()
435 uint64_t pt_section_offset(const struct pt_section *section)  in pt_section_offset()  argument
437 	if (!section)  in pt_section_offset()
440 	return section->offset;  in pt_section_offset()
443 int pt_section_alloc_bcache(struct pt_section *section)  in pt_section_alloc_bcache()  argument
451 	if (!section)  in pt_section_alloc_bcache()
454 	if (!section->mcount)  in pt_section_alloc_bcache()
457 	ssize = pt_section_size(section);  in pt_section_alloc_bcache()
465 	/* We need to take both the attach and the section lock in order to pair  in pt_section_alloc_bcache()
473 	errcode = pt_section_lock_attach(section);  in pt_section_alloc_bcache()
477 	errcode = pt_section_lock(section);  in pt_section_alloc_bcache()
481 	bcache = pt_section_bcache(section);  in pt_section_alloc_bcache()
499 	section->bcache = bcache;  in pt_section_alloc_bcache()
501 	errcode = pt_section_memsize_locked(section, &memsize);  in pt_section_alloc_bcache()
505 	errcode = pt_section_unlock(section);  in pt_section_alloc_bcache()
510 		iscache = section->iscache;  in pt_section_alloc_bcache()
512 			errcode = pt_iscache_notify_resize(iscache, section,  in pt_section_alloc_bcache()
519 	return pt_section_unlock_attach(section);  in pt_section_alloc_bcache()
523 	(void) pt_section_unlock(section);  in pt_section_alloc_bcache()
526 	(void) pt_section_unlock_attach(section);  in pt_section_alloc_bcache()
530 int pt_section_on_map_lock(struct pt_section *section)  in pt_section_on_map_lock()  argument
535 	if (!section)  in pt_section_on_map_lock()
538 	errcode = pt_section_lock_attach(section);  in pt_section_on_map_lock()
542 	iscache = section->iscache;  in pt_section_on_map_lock()
544 		return pt_section_unlock_attach(section);  in pt_section_on_map_lock()
546 	/* There is a potential deadlock when @section was unmapped again and  in pt_section_on_map_lock()
553 	status = pt_iscache_notify_map(iscache, section);  in pt_section_on_map_lock()
555 	errcode = pt_section_unlock_attach(section);  in pt_section_on_map_lock()
562 int pt_section_map_share(struct pt_section *section)  in pt_section_map_share()  argument
567 	if (!section)  in pt_section_map_share()
570 	errcode = pt_section_lock(section);  in pt_section_map_share()
574 	mcount = section->mcount;  in pt_section_map_share()
576 		(void) pt_section_unlock(section);  in pt_section_map_share()
582 		(void) pt_section_unlock(section);  in pt_section_map_share()
586 	section->mcount = mcount;  in pt_section_map_share()
588 	return pt_section_unlock(section);  in pt_section_map_share()
591 int pt_section_unmap(struct pt_section *section)  in pt_section_unmap()  argument
596 	if (!section)  in pt_section_unmap()
599 	errcode = pt_section_lock(section);  in pt_section_unmap()
603 	mcount = section->mcount;  in pt_section_unmap()
609 	section->mcount = mcount -= 1;  in pt_section_unmap()
611 		return pt_section_unlock(section);  in pt_section_unmap()
614 	if (!section->unmap)  in pt_section_unmap()
617 	status = section->unmap(section);  in pt_section_unmap()
619 	pt_bcache_free(section->bcache);  in pt_section_unmap()
620 	section->bcache = NULL;  in pt_section_unmap()
622 	errcode = pt_section_unlock(section);  in pt_section_unmap()
629 	(void) pt_section_unlock(section);  in pt_section_unmap()
633 int pt_section_read(const struct pt_section *section, uint8_t *buffer,  in pt_section_read()  argument
638 	if (!section)  in pt_section_read()
641 	if (!section->read)  in pt_section_read()
644 	limit = section->size;  in pt_section_read()
648 	/* Truncate if we try to read past the end of the section. */  in pt_section_read()
653 	return section->read(section, buffer, size, offset);  in pt_section_read()