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