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authorMatthew Wilcox <willy@infradead.org>2018-06-01 22:46:02 -0400
committerMatthew Wilcox <willy@infradead.org>2018-10-21 10:45:59 -0400
commit4e99d4e9579d3b950bf4b38d0d64eb1b9be78761 (patch)
treea3ecd9d06b4f0eb8bb05369887c9fbe133218e01 /include/linux/xarray.h
parent64d3e9a9e0cc51957d243dd2b0adc5d74ff5e128 (diff)
downloadlinux-stericsson-4e99d4e9579d3b950bf4b38d0d64eb1b9be78761.tar.gz
xarray: Add xas_for_each_conflict
This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'include/linux/xarray.h')
-rw-r--r--include/linux/xarray.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index 381f94a66762..2664e718dbd3 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h
@@ -878,6 +878,7 @@ static inline bool xas_retry(struct xa_state *xas, const void *entry)
void *xas_load(struct xa_state *);
void *xas_store(struct xa_state *, void *entry);
void *xas_find(struct xa_state *, unsigned long max);
+void *xas_find_conflict(struct xa_state *);
bool xas_get_mark(const struct xa_state *, xa_mark_t);
void xas_set_mark(const struct xa_state *, xa_mark_t);
@@ -1088,6 +1089,22 @@ enum {
for (entry = xas_find_marked(xas, max, mark); entry; \
entry = xas_next_marked(xas, max, mark))
+/**
+ * xas_for_each_conflict() - Iterate over a range of an XArray.
+ * @xas: XArray operation state.
+ * @entry: Entry retrieved from the array.
+ *
+ * The loop body will be executed for each entry in the XArray that lies
+ * within the range specified by @xas. If the loop completes successfully,
+ * any entries that lie in this range will be replaced by @entry. The caller
+ * may break out of the loop; if they do so, the contents of the XArray will
+ * be unchanged. The operation may fail due to an out of memory condition.
+ * The caller may also call xa_set_err() to exit the loop while setting an
+ * error to record the reason.
+ */
+#define xas_for_each_conflict(xas, entry) \
+ while ((entry = xas_find_conflict(xas)))
+
void *__xas_next(struct xa_state *);
void *__xas_prev(struct xa_state *);