pnfs: layout roc code

[linux-2.6-block.git] / fs / nfs / pnfs.h

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index f91d0d45551cc67cd11a3509bf6b5e9192069ba4..e2612ea0cbed0162d9fcfb74e2824d1617dfd054 100644 (file)
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -32,6 +32,7 @@
 
 enum {
        NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
+       NFS_LSEG_ROC,           /* roc bit received from server */
 };
 
 struct pnfs_layout_segment {
@@ -50,6 +51,7 @@ enum {
        NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
        NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
        NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
+       NFS_LAYOUT_ROC,                 /* some lseg had roc bit set */
        NFS_LAYOUT_DESTROYED,           /* no new use of layout allowed */
 };
 
@@ -72,6 +74,7 @@ struct pnfs_layout_hdr {
        struct list_head        plh_segs;      /* layout segments list */
        nfs4_stateid            plh_stateid;
        atomic_t                plh_outstanding; /* number of RPCs out */
+       unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
        u32                     plh_barrier; /* ignore lower seqids */
        unsigned long           plh_flags;
        struct inode            *plh_inode;
@@ -162,6 +165,10 @@ int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
                                struct list_head *tmp_list,
                                u32 iomode);
+bool pnfs_roc(struct inode *ino);
+void pnfs_roc_release(struct inode *ino);
+void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
+bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
 
 
 static inline int lo_fail_bit(u32 iomode)
@@ -193,6 +200,28 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
        return NULL;
 }
 
+static inline bool
+pnfs_roc(struct inode *ino)
+{
+       return false;
+}
+
+static inline void
+pnfs_roc_release(struct inode *ino)
+{
+}
+
+static inline void
+pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
+{
+}
+
+static inline bool
+pnfs_roc_drain(struct inode *ino, u32 *barrier)
+{
+       return false;
+}
+
 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
 {
 }