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pnfs: allow non page aligned pnfs layout segments

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Remove alignment checks that would revert to MDS and change pg_test
to return the max ammount left in the segment (or other pg_test call)
up to size of passed request, or 0 if no space is left.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Weston Andros Adamson 2014-05-15 11:56:55 -04:00 committed by Trond Myklebust
parent 5002c58639
commit 19b54848fe
1 changed files with 10 additions and 15 deletions
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25
fs/nfs/pnfs.c
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@ -1388,11 +1388,6 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
WARN_ON_ONCE(pgio->pg_lseg != NULL);
if (req->wb_offset != req->wb_pgbase) {
nfs_pageio_reset_read_mds(pgio);
return;
}
if (pgio->pg_dreq == NULL)
rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
else
@ -1417,11 +1412,6 @@ pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
{
WARN_ON_ONCE(pgio->pg_lseg != NULL);
if (req->wb_offset != req->wb_pgbase) {
nfs_pageio_reset_write_mds(pgio);
return;
}
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
req_offset(req),
@ -1443,9 +1433,9 @@ pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
unsigned int size;
u64 end;
size = nfs_generic_pg_test(pgio, prev, req);
if (!size)
return 0;
@ -1463,11 +1453,16 @@ pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
* first byte that lies outside the pnfs_layout_range. FIXME?
*
*/
if (req_offset(req) >= end_offset(pgio->pg_lseg->pls_range.offset,
pgio->pg_lseg->pls_range.length))
return 0;
if (pgio->pg_lseg) {
end = end_offset(pgio->pg_lseg->pls_range.offset,
pgio->pg_lseg->pls_range.length);
WARN_ON_ONCE(req_offset(req) > end);
if (req_offset(req) >= end)
return 0;
size = min((unsigned int)(end - req_offset(req)), size);
}
return min(size, req->wb_bytes);
return size;
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);