NFSv4.1: filelayout i/o helpers

Prepare for filelayout_read_pagelist with helper functions that find the correct
data server, filehandle, and offset.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: Mike Sager <sager@netapp.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Tigran Mkrtchyan <tigran@anahit.desy.de>
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c
index 8bc91fb8b6fa..f466fed2f466 100644
--- a/fs/nfs/nfs4filelayoutdev.c
+++ b/fs/nfs/nfs4filelayoutdev.c
@@ -516,3 +516,70 @@ nfs4_fl_find_get_deviceid(struct nfs_client *clp, struct nfs4_deviceid *id)
         return (d == NULL) ? NULL :
                 container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
 }
+
+/*
+ * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
+ * Then: ((res + fsi) % dsaddr->stripe_count)
+ */
+u32
+nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
+{
+        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+        u64 tmp;
+
+        tmp = offset - flseg->pattern_offset;
+        do_div(tmp, flseg->stripe_unit);
+        tmp += flseg->first_stripe_index;
+        return do_div(tmp, flseg->dsaddr->stripe_count);
+}
+
+u32
+nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
+{
+        return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
+}
+
+struct nfs_fh *
+nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
+{
+        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+        u32 i;
+
+        if (flseg->stripe_type == STRIPE_SPARSE) {
+                if (flseg->num_fh == 1)
+                        i = 0;
+                else if (flseg->num_fh == 0)
+                        /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
+                        return NULL;
+                else
+                        i = nfs4_fl_calc_ds_index(lseg, j);
+        } else
+                i = j;
+        return flseg->fh_array[i];
+}
+
+struct nfs4_pnfs_ds *
+nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
+{
+        struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr;
+        struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx];
+
+        if (ds == NULL) {
+                printk(KERN_ERR "%s: No data server for offset index %d\n",
+                        __func__, ds_idx);
+                return NULL;
+        }
+
+        if (!ds->ds_clp) {
+                int err;
+
+                err = nfs4_ds_connect(NFS_SERVER(lseg->pls_layout->plh_inode),
+                                          dsaddr->ds_list[ds_idx]);
+                if (err) {
+                        printk(KERN_ERR "%s nfs4_ds_connect error %d\n",
+                               __func__, err);
+                        return NULL;
+                }
+        }
+        return ds;
+}