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pNFS/flexfiles: ff_layout_pg_init_read should exit on error

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If we get an error while retrieving the layout, then we should
report it rather than falling back to I/O through the MDS.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2018-08-21 10:25:33 -04:00 committed by Anna Schumaker
parent ea51f94b45
commit 1c1aeaf143
1 changed files with 11 additions and 17 deletions
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28
fs/nfs/flexfilelayout/flexfilelayout.c
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@ -812,7 +812,6 @@ ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req,
bool strict_iomode)
{
retry_strict:
pnfs_put_lseg(pgio->pg_lseg);
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
@ -825,16 +824,6 @@ ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
pgio->pg_error = PTR_ERR(pgio->pg_lseg);
pgio->pg_lseg = NULL;
}
/* If we don't have checking, do get a IOMODE_RW
* segment, and the server wants to avoid READs
* there, then retry!
*/
if (pgio->pg_lseg && !strict_iomode &&
ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
strict_iomode = true;
goto retry_strict;
}
}
static void
@ -849,14 +838,16 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
retry:
pnfs_generic_pg_check_layout(pgio);
/* Use full layout for now */
if (!pgio->pg_lseg)
if (!pgio->pg_lseg) {
ff_layout_pg_get_read(pgio, req, false);
else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
if (!pgio->pg_lseg)
goto out_nolseg;
}
if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
ff_layout_pg_get_read(pgio, req, true);
/* If no lseg, fall back to read through mds */
if (pgio->pg_lseg == NULL)
goto out_mds;
if (!pgio->pg_lseg)
goto out_nolseg;
}
ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
if (!ds) {
@ -878,6 +869,9 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
return;
out_nolseg:
if (pgio->pg_error < 0)
return;
out_mds:
pnfs_put_lseg(pgio->pg_lseg);
pgio->pg_lseg = NULL;