fs/iomap/iter.c

16  * remap the unprocessed range of the iter, and that means we may need to remap
17  * even when we've made no progress (i.e. iter->processed = 0). Hence the
22 static inline int iomap_iter_advance(struct iomap_iter *iter)
24 	bool stale = iter->iomap.flags & IOMAP_F_STALE;
27 	if (iter->iomap.length) {
28 		if (iter->processed < 0)
29 			return iter->processed;
30 		if (!iter->processed && !stale)
32 		if (WARN_ON_ONCE(iter->processed > iomap_length(iter)))
34 		iter->pos += iter->processed;
35 		iter->len -= iter->processed;
36 		if (!iter->len)
41 	iter->processed = 0;
42 	memset(&iter->iomap, 0, sizeof(iter->iomap));
43 	memset(&iter->srcmap, 0, sizeof(iter->srcmap));
47 static inline void iomap_iter_done(struct iomap_iter *iter)
49 	WARN_ON_ONCE(iter->iomap.offset > iter->pos);
50 	WARN_ON_ONCE(iter->iomap.length == 0);
51 	WARN_ON_ONCE(iter->iomap.offset + iter->iomap.length <= iter->pos);
52 	WARN_ON_ONCE(iter->iomap.flags & IOMAP_F_STALE);
54 	trace_iomap_iter_dstmap(iter->inode, &iter->iomap);
55 	if (iter->srcmap.type != IOMAP_HOLE)
56 		trace_iomap_iter_srcmap(iter->inode, &iter->srcmap);
61  * @iter: iteration structue
71  * of the loop body:  leave @iter.processed unchanged, or set it to a negative
74 int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops)
78 	if (iter->iomap.length && ops->iomap_end) {
79 		ret = ops->iomap_end(iter->inode, iter->pos, iomap_length(iter),
80 				iter->processed > 0 ? iter->processed : 0,
81 				iter->flags, &iter->iomap);
82 		if (ret < 0 && !iter->processed)
86 	trace_iomap_iter(iter, ops, _RET_IP_);
87 	ret = iomap_iter_advance(iter);
91 	ret = ops->iomap_begin(iter->inode, iter->pos, iter->len, iter->flags,
92 			       &iter->iomap, &iter->srcmap);
95 	iomap_iter_done(iter);