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 #define FF_FLAGS_NO_READ_IO 4 15 16 #include "../pnfs.h" 17 18 /* XXX: Let's filter out insanely large mirror count for now to avoid oom 19 * due to network error etc. */ 20 #define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096 21 22 /* LAYOUTSTATS report interval in ms */ 23 #define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L) 24 #define FF_LAYOUTSTATS_MAXDEV 4 25 26 struct nfs4_ff_ds_version { 27 u32 version; 28 u32 minor_version; 29 u32 rsize; 30 u32 wsize; 31 bool tightly_coupled; 32 }; 33 34 /* chained in global deviceid hlist */ 35 struct nfs4_ff_layout_ds { 36 struct nfs4_deviceid_node id_node; 37 u32 ds_versions_cnt; 38 struct nfs4_ff_ds_version *ds_versions; 39 struct nfs4_pnfs_ds *ds; 40 }; 41 42 struct nfs4_ff_layout_ds_err { 43 struct list_head list; /* linked in mirror error_list */ 44 u64 offset; 45 u64 length; 46 int status; 47 enum nfs_opnum4 opnum; 48 nfs4_stateid stateid; 49 struct nfs4_deviceid deviceid; 50 }; 51 52 struct nfs4_ff_io_stat { 53 __u64 ops_requested; 54 __u64 bytes_requested; 55 __u64 ops_completed; 56 __u64 bytes_completed; 57 __u64 bytes_not_delivered; 58 ktime_t total_busy_time; 59 ktime_t aggregate_completion_time; 60 }; 61 62 struct nfs4_ff_busy_timer { 63 ktime_t start_time; 64 atomic_t n_ops; 65 }; 66 67 struct nfs4_ff_layoutstat { 68 struct nfs4_ff_io_stat io_stat; 69 struct nfs4_ff_busy_timer busy_timer; 70 }; 71 72 struct nfs4_ff_layout_mirror { 73 struct pnfs_layout_hdr *layout; 74 struct list_head mirrors; 75 u32 ds_count; 76 u32 efficiency; 77 struct nfs4_deviceid devid; 78 struct nfs4_ff_layout_ds *mirror_ds; 79 u32 fh_versions_cnt; 80 struct nfs_fh *fh_versions; 81 nfs4_stateid stateid; 82 struct rpc_cred __rcu *ro_cred; 83 struct rpc_cred __rcu *rw_cred; 84 atomic_t ref; 85 spinlock_t lock; 86 unsigned long flags; 87 struct nfs4_ff_layoutstat read_stat; 88 struct nfs4_ff_layoutstat write_stat; 89 ktime_t start_time; 90 u32 report_interval; 91 }; 92 93 #define NFS4_FF_MIRROR_STAT_AVAIL (0) 94 95 struct nfs4_ff_layout_segment { 96 struct pnfs_layout_segment generic_hdr; 97 u64 stripe_unit; 98 u32 flags; 99 u32 mirror_array_cnt; 100 struct nfs4_ff_layout_mirror **mirror_array; 101 }; 102 103 struct nfs4_flexfile_layout { 104 struct pnfs_layout_hdr generic_hdr; 105 struct pnfs_ds_commit_info commit_info; 106 struct list_head mirrors; 107 struct list_head error_list; /* nfs4_ff_layout_ds_err */ 108 ktime_t last_report_time; /* Layoutstat report times */ 109 }; 110 111 struct nfs4_flexfile_layoutreturn_args { 112 struct list_head errors; 113 struct nfs42_layoutstat_devinfo devinfo[FF_LAYOUTSTATS_MAXDEV]; 114 unsigned int num_errors; 115 unsigned int num_dev; 116 struct page *pages[1]; 117 }; 118 119 static inline struct nfs4_flexfile_layout * 120 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) 121 { 122 return container_of(lo, struct nfs4_flexfile_layout, generic_hdr); 123 } 124 125 static inline struct nfs4_ff_layout_segment * 126 FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg) 127 { 128 return container_of(lseg, 129 struct nfs4_ff_layout_segment, 130 generic_hdr); 131 } 132 133 static inline struct nfs4_deviceid_node * 134 FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx) 135 { 136 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt || 137 FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL || 138 FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL) 139 return NULL; 140 return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node; 141 } 142 143 static inline struct nfs4_ff_layout_ds * 144 FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node) 145 { 146 return container_of(node, struct nfs4_ff_layout_ds, id_node); 147 } 148 149 static inline struct nfs4_ff_layout_mirror * 150 FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx) 151 { 152 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt) 153 return NULL; 154 return FF_LAYOUT_LSEG(lseg)->mirror_array[idx]; 155 } 156 157 static inline u32 158 FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg) 159 { 160 return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt; 161 } 162 163 static inline bool 164 ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg) 165 { 166 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS; 167 } 168 169 static inline bool 170 ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg) 171 { 172 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_READ_IO; 173 } 174 175 static inline bool 176 ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node) 177 { 178 return nfs4_test_deviceid_unavailable(node); 179 } 180 181 static inline int 182 nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx) 183 { 184 return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version; 185 } 186 187 struct nfs4_ff_layout_ds * 188 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, 189 gfp_t gfp_flags); 190 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 191 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 192 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, 193 struct nfs4_ff_layout_mirror *mirror, u64 offset, 194 u64 length, int status, enum nfs_opnum4 opnum, 195 gfp_t gfp_flags); 196 int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head); 197 void ff_layout_free_ds_ioerr(struct list_head *head); 198 unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo, 199 const struct pnfs_layout_range *range, 200 struct list_head *head, 201 unsigned int maxnum); 202 struct nfs_fh * 203 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx); 204 205 struct nfs4_pnfs_ds * 206 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, 207 bool fail_return); 208 209 struct rpc_clnt * 210 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, 211 u32 ds_idx, 212 struct nfs_client *ds_clp, 213 struct inode *inode); 214 struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, 215 u32 ds_idx, struct rpc_cred *mdscred); 216 bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg); 217 bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg); 218 219 #endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */ 220