NFSv4.2: LAYOUTSTATS is optional to implement
Make it so, by checking the return value for NFS4ERR_MOTSUPP and
caching the information as a server capability.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 06c74cd..f486b80 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -189,9 +189,15 @@
if (!nfs4_sequence_done(task, &data->res.seq_res))
return;
- /* well, we don't care about errors at all! */
- if (task->tk_status)
+ switch (task->tk_status) {
+ case 0:
+ break;
+ case -ENOTSUPP:
+ case -EOPNOTSUPP:
+ NFS_SERVER(data->inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
+ default:
dprintk("%s server returns %d\n", __func__, task->tk_status);
+ }
}
static void
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 643ce3a..8eab424 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -8635,7 +8635,8 @@
| NFS_CAP_ATOMIC_OPEN_V1
| NFS_CAP_ALLOCATE
| NFS_CAP_DEALLOCATE
- | NFS_CAP_SEEK,
+ | NFS_CAP_SEEK
+ | NFS_CAP_LAYOUTSTATS,
.init_client = nfs41_init_client,
.shutdown_client = nfs41_shutdown_client,
.match_stateid = nfs41_match_stateid,
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 40baceb..0ba9a02 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2266,6 +2266,9 @@
if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
goto out;
+ if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
+ goto out;
+
if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
goto out;
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 5e1273d..a2ea149 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -237,5 +237,6 @@
#define NFS_CAP_SEEK (1U << 19)
#define NFS_CAP_ALLOCATE (1U << 20)
#define NFS_CAP_DEALLOCATE (1U << 21)
+#define NFS_CAP_LAYOUTSTATS (1U << 22)
#endif