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pnfs: don't check sequence on new stateids in layoutget

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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@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig 2014-08-21 11:09:20 -05:00 committed by Trond Myklebust
parent 1013df6115
commit 362f74745c
1 changed files with 19 additions and 17 deletions
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36
fs/nfs/pnfs.c
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@ -682,17 +682,6 @@ 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,
@ -1367,16 +1356,29 @@ 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);