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authorRob Norris <[email protected]>2023-12-11 16:05:54 +1100
committerBrian Behlendorf <[email protected]>2024-03-28 13:29:46 -0700
commit52a2af6fd16470dd4ba8f7a1def459b43081ae5b (patch)
tree0297e82d9575101d462bee46fbf92984c4d034e2 /include
parent220bb7341eb4b41f017cec8f492e0daf18660d4e (diff)
abd: add page iterator
The regular ABD iterators yield data buffers, so they have to map and unmap pages into kernel memory. If the caller only wants to count chunks, or can use page pointers directly, then the map/unmap is just unnecessary overhead. This adds adb_iterate_page_func, which yields unmapped struct page instead. Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Rob Norris <[email protected]> Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Closes #15533 Closes #15588 (cherry picked from commit 390b448726c580999dd337be7a40b0e95cf1d50b)
Diffstat (limited to 'include')
-rw-r--r--include/sys/abd.h7
-rw-r--r--include/sys/abd_impl.h26
2 files changed, 30 insertions, 3 deletions
diff --git a/include/sys/abd.h b/include/sys/abd.h
index 750f9986c..8a2df0bca 100644
--- a/include/sys/abd.h
+++ b/include/sys/abd.h
@@ -79,6 +79,9 @@ typedef struct abd {
typedef int abd_iter_func_t(void *buf, size_t len, void *priv);
typedef int abd_iter_func2_t(void *bufa, void *bufb, size_t len, void *priv);
+#if defined(__linux__) && defined(_KERNEL)
+typedef int abd_iter_page_func_t(struct page *, size_t, size_t, void *);
+#endif
extern int zfs_abd_scatter_enabled;
@@ -125,6 +128,10 @@ void abd_release_ownership_of_buf(abd_t *);
int abd_iterate_func(abd_t *, size_t, size_t, abd_iter_func_t *, void *);
int abd_iterate_func2(abd_t *, abd_t *, size_t, size_t, size_t,
abd_iter_func2_t *, void *);
+#if defined(__linux__) && defined(_KERNEL)
+int abd_iterate_page_func(abd_t *, size_t, size_t, abd_iter_page_func_t *,
+ void *);
+#endif
void abd_copy_off(abd_t *, abd_t *, size_t, size_t, size_t);
void abd_copy_from_buf_off(abd_t *, const void *, size_t, size_t);
void abd_copy_to_buf_off(void *, abd_t *, size_t, size_t);
diff --git a/include/sys/abd_impl.h b/include/sys/abd_impl.h
index 40546d4af..f88ea25e2 100644
--- a/include/sys/abd_impl.h
+++ b/include/sys/abd_impl.h
@@ -21,6 +21,7 @@
/*
* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
* Copyright (c) 2016, 2019 by Delphix. All rights reserved.
+ * Copyright (c) 2023, 2024, Klara Inc.
*/
#ifndef _ABD_IMPL_H
@@ -38,12 +39,30 @@ typedef enum abd_stats_op {
ABDSTAT_DECR /* Decrease abdstat values */
} abd_stats_op_t;
-struct scatterlist; /* forward declaration */
+/* forward declarations */
+struct scatterlist;
+struct page;
struct abd_iter {
/* public interface */
- void *iter_mapaddr; /* addr corresponding to iter_pos */
- size_t iter_mapsize; /* length of data valid at mapaddr */
+ union {
+ /* for abd_iter_map()/abd_iter_unmap() */
+ struct {
+ /* addr corresponding to iter_pos */
+ void *iter_mapaddr;
+ /* length of data valid at mapaddr */
+ size_t iter_mapsize;
+ };
+ /* for abd_iter_page() */
+ struct {
+ /* current page */
+ struct page *iter_page;
+ /* offset of data in page */
+ size_t iter_page_doff;
+ /* size of data in page */
+ size_t iter_page_dsize;
+ };
+ };
/* private */
abd_t *iter_abd; /* ABD being iterated through */
@@ -78,6 +97,7 @@ boolean_t abd_iter_at_end(struct abd_iter *);
void abd_iter_advance(struct abd_iter *, size_t);
void abd_iter_map(struct abd_iter *);
void abd_iter_unmap(struct abd_iter *);
+void abd_iter_page(struct abd_iter *);
/*
* Helper macros