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Avoid small buffer copying on write

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It is wrong for arc_write_ready() to use zfs_abd_scatter_enabled to
decide whether to reallocate/copy the buffer, because the answer is
OS-specific and depends on the buffer size.  Instead of that use
abd_size_alloc_linear(), moved into public header.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Closes #12425
This commit is contained in:
Alexander Motin
2021-07-27 19:05:47 -04:00
committed by Brian Behlendorf
parent 5b860ae1fb
commit 415882d228
6 changed files with 6 additions and 5 deletions
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include/sys/abd.h
+1
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@@ -91,6 +91,7 @@ abd_t *abd_alloc_linear(size_t, boolean_t);
abd_t *abd_alloc_gang(void);
abd_t *abd_alloc_for_io(size_t, boolean_t);
abd_t *abd_alloc_sametype(abd_t *, size_t);
boolean_t abd_size_alloc_linear(size_t);
void abd_gang_add(abd_t *, abd_t *, boolean_t);
void abd_free(abd_t *);
abd_t *abd_get_offset(abd_t *, size_t);
include/sys/abd_impl.h
-1
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@@ -68,7 +68,6 @@ abd_t *abd_get_offset_scatter(abd_t *, abd_t *, size_t, size_t);
void abd_free_struct_impl(abd_t *);
void abd_alloc_chunks(abd_t *, size_t);
void abd_free_chunks(abd_t *);
boolean_t abd_size_alloc_linear(size_t);
void abd_update_scatter_stats(abd_t *, abd_stats_op_t);
void abd_update_linear_stats(abd_t *, abd_stats_op_t);
void abd_verify_scatter(abd_t *);