When layoutget returns an entirely new layout stateid it should not
check the generation counter as the new stateid will start with a new
counter entirely unrelated to old one.
The current behavior causes constant layoutget failures against a block
server which allocates a new stateid after an recall that removed all
outstanding layouts.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/nfs/pnfs.c | 36 +++++++++++++++++++-----------------
1 file changed, 19 insertions(+), 17 deletions(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index c72376c..22183fc 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -685,17 +685,6 @@ static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
return (s32)(s1 - s2) > 0;
}
-static void
-pnfs_verify_layout_stateid(struct pnfs_layout_hdr *lo,
- const nfs4_stateid *new,
- struct list_head *free_me_list)
-{
- if (nfs4_stateid_match_other(&lo->plh_stateid, new))
- return;
- /* Layout is new! Kill existing layout segments */
- pnfs_mark_matching_lsegs_invalid(lo, free_me_list, NULL);
-}
-
/* update lo->plh_stateid with new if is more recent */
void
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
@@ -1370,16 +1359,29 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
goto out_forget_reply;
}
- if (pnfs_layoutgets_blocked(lo, 1) ||
- pnfs_layout_stateid_blocked(lo, &res->stateid)) {
+ if (pnfs_layoutgets_blocked(lo, 1)) {
dprintk("%s forget reply due to state\n", __func__);
goto out_forget_reply;
}
- /* Check that the new stateid matches the old stateid */
- pnfs_verify_layout_stateid(lo, &res->stateid, &free_me);
- /* Done processing layoutget. Set the layout stateid */
- pnfs_set_layout_stateid(lo, &res->stateid, false);
+ 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)) {
+ dprintk("%s forget reply due to sequence\n", __func__);
+ goto out_forget_reply;
+ }
+ pnfs_set_layout_stateid(lo, &res->stateid, false);
+ } else {
+ /*
+ * We got an entirely new state ID. Mark all segments for the
+ * inode invalid, and don't bother validating the stateid
+ * sequence number.
+ */
+ pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
+
+ nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
+ lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
+ }
pnfs_get_lseg(lseg);
pnfs_layout_insert_lseg(lo, lseg);
--
1.9.1
--
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