NFSv4: Ignore LAYOUTRETURN result if the layout doesn't match or is invalid
Fix a potential race with CB_LAYOUTRECALL in which the server recalls the
remaining layout segments while our LAYOUTRETURN is still in transit.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 555151b..471018f 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -961,20 +961,26 @@
}
void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
+ const nfs4_stateid *arg_stateid,
const struct pnfs_layout_range *range,
- u32 seq,
const nfs4_stateid *stateid)
{
struct inode *inode = lo->plh_inode;
LIST_HEAD(freeme);
spin_lock(&inode->i_lock);
+ if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
+ !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
+ goto out_unlock;
if (stateid) {
+ u32 seq = be32_to_cpu(arg_stateid->seqid);
+
pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
pnfs_free_returned_lsegs(lo, &freeme, range, seq);
pnfs_set_layout_stateid(lo, stateid, true);
} else
pnfs_mark_layout_stateid_invalid(lo, &freeme);
+out_unlock:
pnfs_clear_layoutreturn_waitbit(lo);
spin_unlock(&inode->i_lock);
pnfs_free_lseg_list(&freeme);