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pnfs: filelayout: support non page aligned layouts

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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>
This commit is contained in:
Weston Andros Adamson 2014-05-15 11:56:56 -04:00 • committed by Trond Myklebust
commit c6194271f9
1 changed files with 20 additions and 32 deletions
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48
fs/nfs/nfs4filelayout.c
View file

@ -639,7 +639,6 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
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 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
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 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
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);
@ -936,43 +929,41 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
{
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;
}
if (!pgio->pg_lseg)
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,
@ -991,10 +982,7 @@ filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
struct nfs_commit_info cinfo;
int status;
WARN_ON_ONCE(pgio->pg_lseg != NULL);
if (req->wb_offset != req->wb_pgbase)
goto out_mds;
if (!pgio->pg_lseg)
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,