1 files changed, 49 insertions, 0 deletions

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index d47c188682b1..6279cff7df74 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -35,6 +35,7 @@
 #include "iostat.h"
 #include "nfs4trace.h"
 #include "delegation.h"
+#include "nfs42.h"
 
 #define NFSDBG_FACILITY         NFSDBG_PNFS
 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
@@ -2250,3 +2251,51 @@ struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
         }
         return thp;
 }
+
+int
+pnfs_report_layoutstat(struct inode *inode)
+{
+        struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
+        struct nfs_server *server = NFS_SERVER(inode);
+        struct nfs42_layoutstat_data *data;
+        struct pnfs_layout_hdr *hdr;
+        int status = 0;
+
+        if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
+                goto out;
+
+        spin_lock(&inode->i_lock);
+        if (!NFS_I(inode)->layout) {
+                spin_unlock(&inode->i_lock);
+                goto out;
+        }
+        hdr = NFS_I(inode)->layout;
+        pnfs_get_layout_hdr(hdr);
+        spin_unlock(&inode->i_lock);
+
+        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        if (!data) {
+                status = -ENOMEM;
+                goto out_put;
+        }
+
+        data->args.fh = NFS_FH(inode);
+        data->args.inode = inode;
+        nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
+        status = ld->prepare_layoutstats(&data->args);
+        if (status)
+                goto out_free;
+
+        status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
+
+out:
+        dprintk("%s returns %d\n", __func__, status);
+        return status;
+
+out_free:
+        kfree(data);
+out_put:
+        pnfs_put_layout_hdr(hdr);
+        goto out;
+}
+EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);