[pnfs] [PATCH 08/12] pnfsd-lexp: layout_get

[Benny Halevy]

Signed-off-by: Benny Halevy <bhalevy at panasas.com>
---
 fs/nfsd/pnfsd_lexp.c |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 60 insertions(+), 0 deletions(-)

diff --git a/fs/nfsd/pnfsd_lexp.c b/fs/nfsd/pnfsd_lexp.c
index 5dc48dc..1d6cb08 100644
--- a/fs/nfsd/pnfsd_lexp.c
+++ b/fs/nfsd/pnfsd_lexp.c
@@ -124,4 +124,64 @@ out:
 	return err;
 }
 
+static int get_stripe_unit(int blocksize)
+{
+	if (blocksize < NFSSVC_MAXBLKSIZE)
+		blocksize = NFSSVC_MAXBLKSIZE - (NFSSVC_MAXBLKSIZE % blocksize);
+	dprintk("%s: return %d\n", __func__, blocksize);
+	return blocksize;
+}
+
+static int pnfsd_lexp_layout_get(struct inode *inode, struct pnfs_layoutget_arg *arg)
+{
+	int rc = 0;
+	struct pnfs_filelayout_layout *layout = NULL;
+	struct knfsd_fh *fhp = NULL;
+
+	dprintk("--> %s: inode=%p\n", __func__, inode);
+
+	arg->seg.layout_type = LAYOUT_NFSV4_FILES;
+	arg->seg.offset = 0;
+	arg->seg.length = NFS4_LENGTH_EOF;
+
+	layout = kzalloc(sizeof(*layout), GFP_KERNEL);
+	if (layout == NULL) {
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	/* Set file layout response args */
+	layout->lg_layout_type = LAYOUT_NFSV4_FILES;
+	layout->lg_stripe_type = STRIPE_SPARSE;
+	layout->lg_commit_through_mds = true;
+	layout->lg_stripe_unit = get_stripe_unit(inode->i_sb->s_blocksize);
+	layout->lg_fh_length = 1;
+	layout->device_id.pnfs_fsid = arg->fsid;
+	layout->device_id.pnfs_devid = 1;			/*FSFTEMP*/
+	layout->lg_first_stripe_index = 0;			/*FSFTEMP*/
+	layout->lg_pattern_offset = 0;
+
+	fhp = kmalloc(sizeof(*fhp), GFP_KERNEL);
+	if (fhp == NULL) {
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	memcpy(fhp, arg->fh, sizeof(*fhp));
+	pnfs_fh_mark_ds(fhp);
+	layout->lg_fh_list = fhp;
+
+	/* Call nfsd to encode layout */
+	rc = arg->func(&arg->xdr, layout);
+exit:
+	kfree(layout);
+	kfree(fhp);
+	dprintk("<-- %s: return %d\n", __func__, rc);
+	return rc;
+
+error:
+	arg->seg.length = 0;
+	goto exit;
+}
+
 #endif /* CONFIG_PNFSD_LOCAL_EXPORT */
-- 
1.5.3.3