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abd: add page iterator

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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 <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Closes #15533
Closes #15588
This commit is contained in:
Rob Norris
2023-12-11 16:05:54 +11:00
committed by Brian Behlendorf
parent df04efe321
commit 390b448726
5 changed files with 169 additions and 14 deletions
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include/sys/abd.h
+7
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@@ -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);