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 #define FF_FLAGS_NO_LAYOUTCOMMIT 1 13 #define FF_FLAGS_NO_IO_THRU_MDS 2 14 15 #include "../pnfs.h" 16 17 /* XXX: Let's filter out insanely large mirror count for now to avoid oom 18 * due to network error etc. */ 19 #define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096 20 21 /* LAYOUTSTATS report interval in ms */ 22 #define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L) 23 24 struct nfs4_ff_ds_version { 25 u32 version; 26 u32 minor_version; 27 u32 rsize; 28 u32 wsize; 29 bool tightly_coupled; 30 }; 31 32 /* chained in global deviceid hlist */ 33 struct nfs4_ff_layout_ds { 34 struct nfs4_deviceid_node id_node; 35 u32 ds_versions_cnt; 36 struct nfs4_ff_ds_version *ds_versions; 37 struct nfs4_pnfs_ds *ds; 38 }; 39 40 struct nfs4_ff_layout_ds_err { 41 struct list_head list; /* linked in mirror error_list */ 42 u64 offset; 43 u64 length; 44 int status; 45 enum nfs_opnum4 opnum; 46 nfs4_stateid stateid; 47 struct nfs4_deviceid deviceid; 48 }; 49 50 struct nfs4_ff_io_stat { 51 __u64 ops_requested; 52 __u64 bytes_requested; 53 __u64 ops_completed; 54 __u64 bytes_completed; 55 __u64 bytes_not_delivered; 56 ktime_t total_busy_time; 57 ktime_t aggregate_completion_time; 58 }; 59 60 struct nfs4_ff_busy_timer { 61 ktime_t start_time; 62 atomic_t n_ops; 63 }; 64 65 struct nfs4_ff_layoutstat { 66 struct nfs4_ff_io_stat io_stat; 67 struct nfs4_ff_busy_timer busy_timer; 68 }; 69 70 struct nfs4_ff_layout_mirror { 71 struct pnfs_layout_hdr *layout; 72 struct list_head mirrors; 73 u32 ds_count; 74 u32 efficiency; 75 struct nfs4_ff_layout_ds *mirror_ds; 76 u32 fh_versions_cnt; 77 struct nfs_fh *fh_versions; 78 nfs4_stateid stateid; 79 u32 uid; 80 u32 gid; 81 struct rpc_cred *cred; 82 atomic_t ref; 83 spinlock_t lock; 84 struct nfs4_ff_layoutstat read_stat; 85 struct nfs4_ff_layoutstat write_stat; 86 ktime_t start_time; 87 ktime_t last_report_time; 88 }; 89 90 struct nfs4_ff_layout_segment { 91 struct pnfs_layout_segment generic_hdr; 92 u64 stripe_unit; 93 u32 flags; 94 u32 mirror_array_cnt; 95 struct nfs4_ff_layout_mirror **mirror_array; 96 }; 97 98 struct nfs4_flexfile_layout { 99 struct pnfs_layout_hdr generic_hdr; 100 struct pnfs_ds_commit_info commit_info; 101 struct list_head mirrors; 102 struct list_head error_list; /* nfs4_ff_layout_ds_err */ 103 }; 104 105 static inline struct nfs4_flexfile_layout * 106 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) 107 { 108 return container_of(lo, struct nfs4_flexfile_layout, generic_hdr); 109 } 110 111 static inline struct nfs4_ff_layout_segment * 112 FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg) 113 { 114 return container_of(lseg, 115 struct nfs4_ff_layout_segment, 116 generic_hdr); 117 } 118 119 static inline struct nfs4_deviceid_node * 120 FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx) 121 { 122 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt || 123 FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL || 124 FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL) 125 return NULL; 126 return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node; 127 } 128 129 static inline struct nfs4_ff_layout_ds * 130 FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node) 131 { 132 return container_of(node, struct nfs4_ff_layout_ds, id_node); 133 } 134 135 static inline struct nfs4_ff_layout_mirror * 136 FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx) 137 { 138 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt) 139 return NULL; 140 return FF_LAYOUT_LSEG(lseg)->mirror_array[idx]; 141 } 142 143 static inline u32 144 FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg) 145 { 146 return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt; 147 } 148 149 static inline bool 150 ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg) 151 { 152 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS; 153 } 154 155 static inline bool 156 ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node) 157 { 158 return nfs4_test_deviceid_unavailable(node); 159 } 160 161 static inline int 162 nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx) 163 { 164 return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version; 165 } 166 167 struct nfs4_ff_layout_ds * 168 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, 169 gfp_t gfp_flags); 170 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 171 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 172 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, 173 struct nfs4_ff_layout_mirror *mirror, u64 offset, 174 u64 length, int status, enum nfs_opnum4 opnum, 175 gfp_t gfp_flags); 176 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo, 177 struct xdr_stream *xdr, int *count, 178 const struct pnfs_layout_range *range); 179 struct nfs_fh * 180 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx); 181 182 struct nfs4_pnfs_ds * 183 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, 184 bool fail_return); 185 186 struct rpc_clnt * 187 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, 188 u32 ds_idx, 189 struct nfs_client *ds_clp, 190 struct inode *inode); 191 struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, 192 u32 ds_idx, struct rpc_cred *mdscred); 193 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg); 194 #endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */ 195