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xarray: Add xas_for_each_conflict

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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>
This commit is contained in:
Matthew Wilcox
2018-06-01 22:46:02 -04:00
parent 64d3e9a9e0
commit 4e99d4e957
3 changed files with 146 additions and 0 deletions
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17
include/linux/xarray.h
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@@ -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 *);