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pNFS/flexfiles: Ensure we initialise the mirror bsizes correctly on read

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While it is true that reading from an unmirrored source always uses
index 0, that is no longer true for mirrored sources when we fail over.

Fixes: 563c53e73b ("NFS: Fix flexfiles read failover")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust
2020-09-18 15:29:58 -04:00
committed by Anna Schumaker
parent 68274f97ae
commit c0a1d129d3
1 changed files with 6 additions and 5 deletions
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11
fs/nfs/flexfilelayout/flexfilelayout.c
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@@ -838,6 +838,7 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_pnfs_ds *ds;
int ds_idx;
u32 i;
retry:
ff_layout_pg_check_layout(pgio, req);
@@ -863,14 +864,14 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
goto retry;
}
mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
for (i = 0; i < pgio->pg_mirror_count; i++) {
mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
pgm = &pgio->pg_mirrors[i];
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
}
pgio->pg_mirror_idx = ds_idx;
/* read always uses only one mirror - idx 0 for pgio layer */
pgm = &pgio->pg_mirrors[0];
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
if (NFS_SERVER(pgio->pg_inode)->flags &
(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
pgio->pg_maxretrans = io_maxretrans;