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pNFS: consolidate the different range intersection tests

Browse source 
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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33
fs/nfs/flexfilelayout/flexfilelayoutdev.c
View file

@ -198,22 +198,13 @@ static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,
return true;
}
static u64
end_offset(u64 start, u64 len)
{
u64 end;
end = start + len;
return end >= start ? end : NFS4_MAX_UINT64;
}
static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
u64 offset, u64 length)
{
u64 end;
end = max_t(u64, end_offset(err->offset, err->length),
end_offset(offset, length));
end = max_t(u64, pnfs_end_offset(err->offset, err->length),
pnfs_end_offset(offset, length));
err->offset = min_t(u64, err->offset, offset);
err->length = end - err->offset;
}
@ -235,9 +226,9 @@ ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
if (ret != 0)
return ret;
if (end_offset(e1->offset, e1->length) < e2->offset)
if (pnfs_end_offset(e1->offset, e1->length) < e2->offset)
return -1;
if (e1->offset > end_offset(e2->offset, e2->length))
if (e1->offset > pnfs_end_offset(e2->offset, e2->length))
return 1;
/* If ranges overlap or are contiguous, they are the same */
return 0;
@ -457,16 +448,6 @@ nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
}
}
static bool is_range_intersecting(u64 offset1, u64 length1,
u64 offset2, u64 length2)
{
u64 end1 = end_offset(offset1, length1);
u64 end2 = end_offset(offset2, length2);
return (end1 == NFS4_MAX_UINT64 || end1 > offset2) &&
(end2 == NFS4_MAX_UINT64 || end2 > offset1);
}
/* called with inode i_lock held */
int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
struct xdr_stream *xdr, int *count,
@ -476,8 +457,10 @@ int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
__be32 *p;
list_for_each_entry_safe(err, n, &flo->error_list, list) {
if (!is_range_intersecting(err->offset, err->length,
range->offset, range->length))
if (!pnfs_is_range_intersecting(err->offset,
pnfs_end_offset(err->offset, err->length),
range->offset,
pnfs_end_offset(range->offset, range->length)))
continue;
/* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
* + array length + deviceid(NFS4_DEVICEID4_SIZE)

35
fs/nfs/pnfs.c
View file

@ -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);

32
fs/nfs/pnfs.h
View file

@ -560,6 +560,38 @@ pnfs_copy_range(struct pnfs_layout_range *dst,
memcpy(dst, src, sizeof(*dst));
}
static inline u64
pnfs_end_offset(u64 start, u64 len)
{
if (NFS4_MAX_UINT64 - start <= len)
return NFS4_MAX_UINT64;
return start + len;
}
/*
* Are 2 ranges intersecting?
* start1 end1
* [----------------------------------)
* start2 end2
* [----------------)
*/
static inline bool
pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
{
return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
(end2 == NFS4_MAX_UINT64 || start1 < end2);
}
static inline bool
pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
u64 end1 = pnfs_end_offset(l1->offset, l1->length);
u64 end2 = pnfs_end_offset(l2->offset, l2->length);
return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
}
extern unsigned int layoutstats_timer;
#ifdef NFS_DEBUG