From 362f74745c15fb9acad577ab8e1342ee5313a2a5 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 21 Aug 2014 11:09:20 -0500 Subject: pnfs: don't check sequence on new stateids in layoutget 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 Signed-off-by: Trond Myklebust --- fs/nfs/pnfs.c | 36 +++++++++++++++++++----------------- 1 file changed, 19 insertions(+), 17 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 0e0364ca877d..ff7fabe33529 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -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); -- cgit