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pNFS: consolidate the different range intersection tests

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Both pnfs.c and the flexfiles code have their own versions of the
range intersection testing, and the "end_offset" helper.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2016-10-25 12:24:25 -04:00
parent ee284e35d8
commit 17822b207f
3 changed files with 43 additions and 57 deletions
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35
fs/nfs/pnfs.c
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@@ -500,15 +500,6 @@ pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
}
EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
static u64
end_offset(u64 start, u64 len)
{
u64 end;
end = start + len;
return end >= start ? end : NFS4_MAX_UINT64;
}
/*
* is l2 fully contained in l1?
* start1 end1
@@ -521,33 +512,13 @@ pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
u64 start1 = l1->offset;
u64 end1 = end_offset(start1, l1->length);
u64 end1 = pnfs_end_offset(start1, l1->length);
u64 start2 = l2->offset;
u64 end2 = end_offset(start2, l2->length);
u64 end2 = pnfs_end_offset(start2, l2->length);
return (start1 <= start2) && (end1 >= end2);
}
/*
* is l1 and l2 intersecting?
* start1 end1
* [----------------------------------)
* start2 end2
* [----------------)
*/
static bool
pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
u64 start1 = l1->offset;
u64 end1 = end_offset(start1, l1->length);
u64 start2 = l2->offset;
u64 end2 = end_offset(start2, l2->length);
return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
(end2 == NFS4_MAX_UINT64 || end2 > start1);
}
static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
struct list_head *tmp_list)
{
@@ -2069,7 +2040,7 @@ pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
*
*/
if (pgio->pg_lseg) {
seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
pgio->pg_lseg->pls_range.length);
req_start = req_offset(req);
WARN_ON_ONCE(req_start >= seg_end);