From: Andy Adamson <andros@xxxxxxxxxx>
Add a layout driver method to encode the layout type specific
opaque part of layout return in-line in the xdr stream.
Currently the pnfs-objects layout driver uses it to encode i/o error
information on LAYOUTRETURN.
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
[fixup layout header pointer for encode_layoutreturn]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
fs/nfs/nfs4xdr.c | 9 +++++++--
fs/nfs/pnfs.h | 4 ++++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index f242120..d464bad 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1920,8 +1920,13 @@ encode_layoutreturn(struct xdr_stream *xdr,
spin_lock(&args->inode->i_lock);
xdr_encode_opaque_fixed(p, &args->stateid.data, NFS4_STATEID_SIZE);
spin_unlock(&args->inode->i_lock);
- p = reserve_space(xdr, 4);
- *p = cpu_to_be32(0);
+ if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
+ NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
+ NFS_I(args->inode)->layout, xdr, args);
+ } else {
+ p = reserve_space(xdr, 4);
+ *p = cpu_to_be32(0);
+ }
hdr->nops++;
hdr->replen += decode_layoutreturn_maxsz;
}
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index af3967a..1b6b207 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -104,6 +104,10 @@ struct pnfs_layoutdriver_type {
enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
void (*free_deviceid_node) (struct nfs4_deviceid_node *);
+
+ void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
+ struct xdr_stream *xdr,
+ const struct nfs4_layoutreturn_args *args);
};
struct pnfs_layout_hdr {
--
1.7.2.3
--
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