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pnfs: pnfs_find_lseg() should not check NFS_LSEG_LAYOUTRETURN 

Layout segment validity is determined only by the NFS_LSEG_VALID flag. If
it is set, the layout segment is finable. As it is, when the flexfiles
driver sets NFS_LSEG_LAYOUTRETURN to indicate that we cannot discard
the layout segment, but that it must be returned, then this can result
in an unnecessary layoutget storm.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2018-08-01 14:28:57 -04:00 committed by Anna Schumaker
parent 01e03bdc74
commit 2230ca0d28
1 changed files with 0 additions and 1 deletions
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fs/nfs/pnfs.c
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@ -1650,7 +1650,6 @@ pnfs_find_lseg(struct pnfs_layout_hdr *lo,
list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
pnfs_lseg_range_match(&lseg->pls_range, range,
strict_iomode)) {
ret = pnfs_get_lseg(lseg);