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ABD page support to vdev_disk.c

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Signed-off-by: Isaac Huang <he.huang@intel.com>
This commit is contained in:
Isaac Huang
2016-08-31 00:26:43 -06:00
committed by Brian Behlendorf
parent a6255b7fce
commit b0be93e81a
4 changed files with 90 additions and 57 deletions
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module/zfs/abd.c
+59 -1
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@@ -999,8 +999,66 @@ abd_cmp(abd_t *dabd, abd_t *sabd)
abd_cmp_cb, NULL));
}
#if defined(_KERNEL) && defined(HAVE_SPL)
/*
* bio_nr_pages for ABD.
* @off is the offset in @abd
*/
unsigned long
abd_nr_pages_off(abd_t *abd, unsigned int size, size_t off)
{
unsigned long pos;
if (abd_is_linear(abd))
pos = (unsigned long)abd_to_buf(abd) + off;
else
pos = abd->abd_u.abd_scatter.abd_offset + off;
return ((pos + size + PAGESIZE - 1) >> PAGE_SHIFT)
- (pos >> PAGE_SHIFT);
}
/*
* bio_map for scatter ABD.
* @off is the offset in @abd
* Remaining IO size is returned
*/
unsigned int
abd_scatter_bio_map_off(struct bio *bio, abd_t *abd,
unsigned int io_size, size_t off)
{
int i;
struct abd_iter aiter;
ASSERT(!abd_is_linear(abd));
ASSERT3U(io_size, <=, abd->abd_size - off);
abd_iter_init(&aiter, abd);
abd_iter_advance(&aiter, off);
for (i = 0; i < bio->bi_max_vecs; i++) {
struct page *pg;
size_t len, pgoff, index;
if (io_size <= 0)
break;
pgoff = abd_iter_scatter_chunk_offset(&aiter);
len = MIN(io_size, PAGESIZE - pgoff);
ASSERT(len > 0);
index = abd_iter_scatter_chunk_index(&aiter);
pg = abd->abd_u.abd_scatter.abd_chunks[index];
if (bio_add_page(bio, pg, len, pgoff) != len)
break;
io_size -= len;
abd_iter_advance(&aiter, len);
}
return (io_size);
}
/* Tunable Parameters */
module_param(zfs_abd_scatter_enabled, int, 0644);
MODULE_PARM_DESC(zfs_abd_scatter_enabled,