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abd_get_from_buf_struct: wrap existing buf with ABD stored on stack 

This allows a simple "wrapping" ABD for an existing linear buffer to be
allocated on the stack, avoiding an allocation.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
This commit is contained in:
Rob Norris 2024-07-11 07:37:30 +10:00 committed by Tony Hutter
parent 9e15877dfb
commit ba2209ec9e
2 changed files with 18 additions and 5 deletions
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1
include/sys/abd.h
View File

@ -93,6 +93,7 @@ abd_t *abd_get_offset_size(abd_t *, size_t, size_t);
abd_t *abd_get_offset_struct(abd_t *, abd_t *, size_t, size_t);
abd_t *abd_get_zeros(size_t);
abd_t *abd_get_from_buf(void *, size_t);
abd_t *abd_get_from_buf_struct(abd_t *, void *, size_t);
void abd_cache_reap_now(void);
/*

22
module/zfs/abd.c
View File

@ -603,13 +603,11 @@ abd_get_zeros(size_t size)
}
/*
* Allocate a linear ABD structure for buf.
* Create a linear ABD for an existing buf.
*/
abd_t *
abd_get_from_buf(void *buf, size_t size)
static abd_t *
abd_get_from_buf_impl(abd_t *abd, void *buf, size_t size)
{
abd_t *abd = abd_alloc_struct(0);
VERIFY3U(size, <=, SPA_MAXBLOCKSIZE);
/*
@ -625,6 +623,20 @@ abd_get_from_buf(void *buf, size_t size)
return (abd);
}
abd_t *
abd_get_from_buf(void *buf, size_t size)
{
abd_t *abd = abd_alloc_struct(0);
return (abd_get_from_buf_impl(abd, buf, size));
}
abd_t *
abd_get_from_buf_struct(abd_t *abd, void *buf, size_t size)
{
abd_init_struct(abd);
return (abd_get_from_buf_impl(abd, buf, size));
}
/*
* Get the raw buffer associated with a linear ABD.
*/