[PATCH v5 19/78] xarray: Add xas_create_range
From: Matthew Wilcox <willy@infradead.org>
Date: 2017-12-15 22:03:51
Also in:
linux-f2fs-devel, linux-fsdevel, linux-mm, linux-usb, linux-xfs, lkml
Subsystem:
library code, the rest, xarray · Maintainers:
Andrew Morton, Linus Torvalds, Matthew Wilcox
From: Matthew Wilcox <redacted> This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox <redacted> --- include/linux/xarray.h | 2 ++ lib/xarray.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+)
diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index 2d889208b68d..bcc321fb280f 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h@@ -685,6 +685,8 @@ void xas_init_tags(const struct xa_state *); bool xas_nomem(struct xa_state *, gfp_t); void xas_pause(struct xa_state *); +void xas_create_range(struct xa_state *, unsigned long max); + /** * xas_reload() - Refetch an entry from the xarray. * @xas: XArray operation state.
diff --git a/lib/xarray.c b/lib/xarray.c
index a4975aeedf6b..e3be7c0c2e35 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c@@ -605,6 +605,28 @@ void *xas_create(struct xa_state *xas) } EXPORT_SYMBOL_GPL(xas_create); +/** + * xas_create_range() - Ensure that stores to this range will succeed + * @xas: XArray operation state. + * @max: The highest index to create a slot for. + * + * Creates all of the slots in the range between the current position of + * @xas and @max. This is for the benefit of users who have not yet been + * converted to multi-index entries. + * + * The implementation is naive. + */ +void xas_create_range(struct xa_state *xas, unsigned long max) +{ + XA_STATE(tmp, xas->xa, xas->xa_index); + + do { + xas_create(&tmp); + xas_set(&tmp, tmp.xa_index + XA_CHUNK_SIZE); + } while (tmp.xa_index < max); +} +EXPORT_SYMBOL_GPL(xas_create_range); + static void store_siblings(struct xa_state *xas, void *entry, int *countp, int *valuesp) {
--
2.15.1
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