1 /* 2 * NFSv4 flexfile layout driver data structures. 3 * 4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 5 * 6 * Tao Peng <bergwolf@primarydata.com> 7 */ 8 9 #ifndef FS_NFS_NFS4FLEXFILELAYOUT_H 10 #define FS_NFS_NFS4FLEXFILELAYOUT_H 11 12 #include "../pnfs.h" 13 14 /* XXX: Let's filter out insanely large mirror count for now to avoid oom 15 * due to network error etc. */ 16 #define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096 17 18 struct nfs4_ff_ds_version { 19 u32 version; 20 u32 minor_version; 21 u32 rsize; 22 u32 wsize; 23 bool tightly_coupled; 24 }; 25 26 /* chained in global deviceid hlist */ 27 struct nfs4_ff_layout_ds { 28 struct nfs4_deviceid_node id_node; 29 u32 ds_versions_cnt; 30 struct nfs4_ff_ds_version *ds_versions; 31 struct nfs4_pnfs_ds *ds; 32 }; 33 34 struct nfs4_ff_layout_ds_err { 35 struct list_head list; /* linked in mirror error_list */ 36 u64 offset; 37 u64 length; 38 int status; 39 enum nfs_opnum4 opnum; 40 nfs4_stateid stateid; 41 struct nfs4_deviceid deviceid; 42 }; 43 44 struct nfs4_ff_layout_mirror { 45 u32 ds_count; 46 u32 efficiency; 47 struct nfs4_ff_layout_ds *mirror_ds; 48 u32 fh_versions_cnt; 49 struct nfs_fh *fh_versions; 50 nfs4_stateid stateid; 51 struct nfs4_string user_name; 52 struct nfs4_string group_name; 53 u32 uid; 54 u32 gid; 55 struct rpc_cred *cred; 56 spinlock_t lock; 57 }; 58 59 struct nfs4_ff_layout_segment { 60 struct pnfs_layout_segment generic_hdr; 61 u64 stripe_unit; 62 u32 mirror_array_cnt; 63 struct nfs4_ff_layout_mirror **mirror_array; 64 }; 65 66 struct nfs4_flexfile_layout { 67 struct pnfs_layout_hdr generic_hdr; 68 struct pnfs_ds_commit_info commit_info; 69 struct list_head error_list; /* nfs4_ff_layout_ds_err */ 70 }; 71 72 static inline struct nfs4_flexfile_layout * 73 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) 74 { 75 return container_of(lo, struct nfs4_flexfile_layout, generic_hdr); 76 } 77 78 static inline struct nfs4_ff_layout_segment * 79 FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg) 80 { 81 return container_of(lseg, 82 struct nfs4_ff_layout_segment, 83 generic_hdr); 84 } 85 86 static inline struct nfs4_deviceid_node * 87 FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx) 88 { 89 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt || 90 FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL || 91 FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL) 92 return NULL; 93 return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node; 94 } 95 96 static inline struct nfs4_ff_layout_ds * 97 FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node) 98 { 99 return container_of(node, struct nfs4_ff_layout_ds, id_node); 100 } 101 102 static inline struct nfs4_ff_layout_mirror * 103 FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx) 104 { 105 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt) 106 return NULL; 107 return FF_LAYOUT_LSEG(lseg)->mirror_array[idx]; 108 } 109 110 static inline u32 111 FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg) 112 { 113 return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt; 114 } 115 116 static inline bool 117 ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node) 118 { 119 return nfs4_test_deviceid_unavailable(node); 120 } 121 122 static inline int 123 nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx) 124 { 125 return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version; 126 } 127 128 struct nfs4_ff_layout_ds * 129 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, 130 gfp_t gfp_flags); 131 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 132 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 133 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, 134 struct nfs4_ff_layout_mirror *mirror, u64 offset, 135 u64 length, int status, enum nfs_opnum4 opnum, 136 gfp_t gfp_flags); 137 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo, 138 struct xdr_stream *xdr, int *count, 139 const struct pnfs_layout_range *range); 140 struct nfs_fh * 141 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx); 142 143 struct nfs4_pnfs_ds * 144 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, 145 bool fail_return); 146 147 struct rpc_clnt * 148 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, 149 u32 ds_idx, 150 struct nfs_client *ds_clp, 151 struct inode *inode); 152 struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, 153 u32 ds_idx, struct rpc_cred *mdscred); 154 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg); 155 #endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */ 156