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pnfs: encode_layoutreturn

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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@netapp.com>
[fixup layout header pointer for encode_layoutreturn]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Andy Adamson 2011-05-22 19:53:10 +03:00 committed by Boaz Harrosh
parent 8a1636c459
commit 04a555498e
2 changed files with 11 additions and 2 deletions
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9
fs/nfs/nfs4xdr.c
View file

@ -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;
}

4
fs/nfs/pnfs.h
View file

@ -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 {