Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / nfs / flexfilelayout / flexfilelayout.h

diff --git a/kernel/fs/nfs/flexfilelayout/flexfilelayout.h b/kernel/fs/nfs/flexfilelayout/flexfilelayout.h
new file mode 100644 (file)
index 0000000..070f204
--- /dev/null
+++ b/kernel/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -0,0 +1,155 @@
+/*
+ * NFSv4 flexfile layout driver data structures.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@primarydata.com>
+ */
+
+#ifndef FS_NFS_NFS4FLEXFILELAYOUT_H
+#define FS_NFS_NFS4FLEXFILELAYOUT_H
+
+#include "../pnfs.h"
+
+/* XXX: Let's filter out insanely large mirror count for now to avoid oom
+ * due to network error etc. */
+#define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
+
+struct nfs4_ff_ds_version {
+       u32                             version;
+       u32                             minor_version;
+       u32                             rsize;
+       u32                             wsize;
+       bool                            tightly_coupled;
+};
+
+/* chained in global deviceid hlist */
+struct nfs4_ff_layout_ds {
+       struct nfs4_deviceid_node       id_node;
+       u32                             ds_versions_cnt;
+       struct nfs4_ff_ds_version       *ds_versions;
+       struct nfs4_pnfs_ds             *ds;
+};
+
+struct nfs4_ff_layout_ds_err {
+       struct list_head                list; /* linked in mirror error_list */
+       u64                             offset;
+       u64                             length;
+       int                             status;
+       enum nfs_opnum4                 opnum;
+       nfs4_stateid                    stateid;
+       struct nfs4_deviceid            deviceid;
+};
+
+struct nfs4_ff_layout_mirror {
+       u32                             ds_count;
+       u32                             efficiency;
+       struct nfs4_ff_layout_ds        *mirror_ds;
+       u32                             fh_versions_cnt;
+       struct nfs_fh                   *fh_versions;
+       nfs4_stateid                    stateid;
+       struct nfs4_string              user_name;
+       struct nfs4_string              group_name;
+       u32                             uid;
+       u32                             gid;
+       struct rpc_cred                 *cred;
+       spinlock_t                      lock;
+};
+
+struct nfs4_ff_layout_segment {
+       struct pnfs_layout_segment      generic_hdr;
+       u64                             stripe_unit;
+       u32                             mirror_array_cnt;
+       struct nfs4_ff_layout_mirror    **mirror_array;
+};
+
+struct nfs4_flexfile_layout {
+       struct pnfs_layout_hdr generic_hdr;
+       struct pnfs_ds_commit_info commit_info;
+       struct list_head        error_list; /* nfs4_ff_layout_ds_err */
+};
+
+static inline struct nfs4_flexfile_layout *
+FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
+{
+       return container_of(lo, struct nfs4_flexfile_layout, generic_hdr);
+}
+
+static inline struct nfs4_ff_layout_segment *
+FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
+{
+       return container_of(lseg,
+                           struct nfs4_ff_layout_segment,
+                           generic_hdr);
+}
+
+static inline struct nfs4_deviceid_node *
+FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
+{
+       if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt ||
+           FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL ||
+           FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL)
+               return NULL;
+       return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node;
+}
+
+static inline struct nfs4_ff_layout_ds *
+FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
+{
+       return container_of(node, struct nfs4_ff_layout_ds, id_node);
+}
+
+static inline struct nfs4_ff_layout_mirror *
+FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
+{
+       if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt)
+               return NULL;
+       return FF_LAYOUT_LSEG(lseg)->mirror_array[idx];
+}
+
+static inline u32
+FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg)
+{
+       return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt;
+}
+
+static inline bool
+ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)
+{
+       return nfs4_test_deviceid_unavailable(node);
+}
+
+static inline int
+nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx)
+{
+       return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version;
+}
+
+struct nfs4_ff_layout_ds *
+nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+                           gfp_t gfp_flags);
+void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
+void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
+int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
+                            struct nfs4_ff_layout_mirror *mirror, u64 offset,
+                            u64 length, int status, enum nfs_opnum4 opnum,
+                            gfp_t gfp_flags);
+int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
+                             struct xdr_stream *xdr, int *count,
+                             const struct pnfs_layout_range *range);
+struct nfs_fh *
+nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);
+
+struct nfs4_pnfs_ds *
+nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
+                         bool fail_return);
+
+struct rpc_clnt *
+nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg,
+                                u32 ds_idx,
+                                struct nfs_client *ds_clp,
+                                struct inode *inode);
+struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
+                                      u32 ds_idx, struct rpc_cred *mdscred);
+bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
+#endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */