diff mbox

[v4,03/13] pNFS/flexfiles: When initing reads or writes, we might have to retry connecting to DSes

Message ID 1463502528-11519-4-git-send-email-jeff.layton@primarydata.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jeff Layton May 17, 2016, 4:28 p.m. UTC 
From: Tom Haynes <loghyr@primarydata.com>

If we are initializing reads or writes and can not connect to a DS, then
check whether or not IO is allowed through the MDS. If it is allowed,
reset to the MDS. Else, fail the layout segment and force a retry
of a new layout segment.

Signed-off-by: Tom Haynes <loghyr@primarydata.com>
---
 fs/nfs/flexfilelayout/flexfilelayout.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index f538ca6bbe81..f58cd2a14d5e 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -847,8 +847,13 @@  ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 		goto out_mds;
 
 	ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
-	if (!ds)
-		goto out_mds;
+	if (!ds) {
+		if (ff_layout_no_fallback_to_mds(pgio->pg_lseg))
+			goto out_pnfs;
+		else
+			goto out_mds;
+	}
+
 	mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
 
 	pgio->pg_mirror_idx = ds_idx;
@@ -862,6 +867,12 @@  out_mds:
 	pnfs_put_lseg(pgio->pg_lseg);
 	pgio->pg_lseg = NULL;
 	nfs_pageio_reset_read_mds(pgio);
+	return;
+
+out_pnfs:
+	pnfs_set_lo_fail(pgio->pg_lseg);
+	pnfs_put_lseg(pgio->pg_lseg);
+	pgio->pg_lseg = NULL;
 }
 
 static void
@@ -904,8 +915,12 @@  ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 
 	for (i = 0; i < pgio->pg_mirror_count; i++) {
 		ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
-		if (!ds)
-			goto out_mds;
+		if (!ds) {
+			if (ff_layout_no_fallback_to_mds(pgio->pg_lseg))
+				goto out_pnfs;
+			else
+				goto out_mds;
+		}
 		pgm = &pgio->pg_mirrors[i];
 		mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
 		pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
@@ -917,6 +932,12 @@  out_mds:
 	pnfs_put_lseg(pgio->pg_lseg);
 	pgio->pg_lseg = NULL;
 	nfs_pageio_reset_write_mds(pgio);
+	return;
+
+out_pnfs:
+	pnfs_set_lo_fail(pgio->pg_lseg);
+	pnfs_put_lseg(pgio->pg_lseg);
+	pgio->pg_lseg = NULL;
 }
 
 static unsigned int