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flexfiles: use per-mirror specified stateid for IO

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rfc8435 says:

  For tight coupling, ffds_stateid provides the stateid to be used by
  the client to access the file.

However current implementation replaces per-mirror provided stateid with
by open or lock stateid.

Ensure that per-mirror stateid is used by ff_layout_write_prepare_v4 and
nfs4_ff_layout_prepare_ds.

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: Rick Macklem <rmacklem@uoguelph.ca>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Tigran Mkrtchyan
2018-11-21 12:25:41 +01:00
committed by Trond Myklebust
parent 99f2c55591
commit bb21ce0ad2
3 changed files with 32 additions and 12 deletions
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19
fs/nfs/flexfilelayout/flexfilelayoutdev.c
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@@ -370,6 +370,25 @@ out:
return fh;
}
int
nfs4_ff_layout_select_ds_stateid(struct pnfs_layout_segment *lseg,
u32 mirror_idx,
nfs4_stateid *stateid)
{
struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
if (!ff_layout_mirror_valid(lseg, mirror, false)) {
pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",
__func__, mirror_idx);
goto out;
}
nfs4_stateid_copy(stateid, &mirror->stateid);
return 1;
out:
return 0;
}
/**
* nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
* @lseg: the layout segment we're operating on