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NFSv4/pnfs: Fix layoutget behaviour after invalidation

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If the layout gets invalidated, we should wait for any outstanding
layoutget requests for that layout to complete, and we should resend
them only after re-establishing the layout stateid.

Fixes: d29b468da4 ("pNFS/NFSv4: Improve rejection of out-of-order layouts")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-07-02 19:48:41 -04:00
parent aa95edf309
commit 0b77f97a7e
1 changed files with 5 additions and 5 deletions
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10
fs/nfs/pnfs.c
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@ -2014,7 +2014,7 @@ lookup_again:
* If the layout segment list is empty, but there are outstanding
* layoutget calls, then they might be subject to a layoutrecall.
*/
if (list_empty(&lo->plh_segs) &&
if ((list_empty(&lo->plh_segs) || !pnfs_layout_is_valid(lo)) &&
atomic_read(&lo->plh_outstanding) != 0) {
spin_unlock(&ino->i_lock);
lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
@ -2390,11 +2390,13 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
goto out_forget;
}
if (!pnfs_layout_is_valid(lo) && !pnfs_is_first_layoutget(lo))
goto out_forget;
if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
/* existing state ID, make sure the sequence number matches. */
if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
if (!pnfs_layout_is_valid(lo) &&
pnfs_is_first_layoutget(lo))
if (!pnfs_layout_is_valid(lo))
lo->plh_barrier = 0;
dprintk("%s forget reply due to sequence\n", __func__);
goto out_forget;
@ -2413,8 +2415,6 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
goto out_forget;
} else {
/* We have a completely new layout */
if (!pnfs_is_first_layoutget(lo))
goto out_forget;
pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
}