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pNFS/flexfiles: When initing reads or writes, we might have to retry connecting to DSes

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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>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Tom Haynes 2016-05-17 12:28:38 -04:00 committed by Anna Schumaker
parent 3b13b4b311
commit 446ca21953
1 changed files with 25 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

29
fs/nfs/flexfilelayout/flexfilelayout.c
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@ -848,8 +848,13 @@ 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;
@ -863,6 +868,12 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
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
@ -905,8 +916,12 @@ 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;
@ -918,6 +933,12 @@ ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
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