pnfs: filelayout: support non page aligned layouts
Use the new pg_test interface to adjust requests to fit in the current
stripe / segment.
Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 0ebc521..63a1637 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -639,7 +639,6 @@
struct nfs4_deviceid_node *d;
struct nfs4_file_layout_dsaddr *dsaddr;
int status = -EINVAL;
- struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
dprintk("--> %s\n", __func__);
@@ -657,7 +656,7 @@
goto out;
}
- if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
+ if (!fl->stripe_unit) {
dprintk("%s Invalid stripe unit (%u)\n",
__func__, fl->stripe_unit);
goto out;
@@ -694,12 +693,6 @@
goto out_put;
}
- if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
- dprintk("%s Stripe unit (%u) not aligned with rsize %u "
- "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
- nfss->wsize);
- }
-
status = 0;
out:
dprintk("--> %s returns %d\n", __func__, status);
@@ -936,44 +929,42 @@
{
unsigned int size;
u64 p_stripe, r_stripe;
- u32 stripe_unit;
+ u32 stripe_offset;
+ u64 segment_offset = pgio->pg_lseg->pls_range.offset;
+ u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
/* calls nfs_generic_pg_test */
size = pnfs_generic_pg_test(pgio, prev, req);
if (!size)
return 0;
+ /* see if req and prev are in the same stripe */
if (prev) {
- p_stripe = (u64)req_offset(prev);
- r_stripe = (u64)req_offset(req);
- stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
-
+ p_stripe = (u64)req_offset(prev) - segment_offset;
+ r_stripe = (u64)req_offset(req) - segment_offset;
do_div(p_stripe, stripe_unit);
do_div(r_stripe, stripe_unit);
if (p_stripe != r_stripe)
return 0;
}
- return min(size, req->wb_bytes);
+
+ /* calculate remaining bytes in the current stripe */
+ div_u64_rem((u64)req_offset(req) - segment_offset,
+ stripe_unit,
+ &stripe_offset);
+ WARN_ON_ONCE(stripe_offset > stripe_unit);
+ if (stripe_offset >= stripe_unit)
+ return 0;
+ return min(stripe_unit - (unsigned int)stripe_offset, size);
}
static void
filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
- WARN_ON_ONCE(pgio->pg_lseg != NULL);
-
- if (req->wb_offset != req->wb_pgbase) {
- /*
- * Handling unaligned pages is difficult, because have to
- * somehow split a req in two in certain cases in the
- * pg.test code. Avoid this by just not using pnfs
- * in this case.
- */
- nfs_pageio_reset_read_mds(pgio);
- return;
- }
- pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ if (!pgio->pg_lseg)
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,
NFS4_MAX_UINT64,
@@ -991,11 +982,8 @@
struct nfs_commit_info cinfo;
int status;
- WARN_ON_ONCE(pgio->pg_lseg != NULL);
-
- if (req->wb_offset != req->wb_pgbase)
- goto out_mds;
- pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ if (!pgio->pg_lseg)
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,
NFS4_MAX_UINT64,