1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * NFSv4 flexfile layout driver data structures. 4 * 5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 6 * 7 * Tao Peng <bergwolf@primarydata.com> 8 */ 9 10 #ifndef FS_NFS_NFS4FLEXFILELAYOUT_H 11 #define FS_NFS_NFS4FLEXFILELAYOUT_H 12 13 #define FF_FLAGS_NO_LAYOUTCOMMIT 1 14 #define FF_FLAGS_NO_IO_THRU_MDS 2 15 #define FF_FLAGS_NO_READ_IO 4 16 17 #include <linux/refcount.h> 18 #include "../pnfs.h" 19 20 /* XXX: Let's filter out insanely large mirror count for now to avoid oom 21 * due to network error etc. */ 22 #define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096 23 24 /* LAYOUTSTATS report interval in ms */ 25 #define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L) 26 #define FF_LAYOUTSTATS_MAXDEV 4 27 28 struct nfs4_ff_ds_version { 29 u32 version; 30 u32 minor_version; 31 u32 rsize; 32 u32 wsize; 33 bool tightly_coupled; 34 }; 35 36 /* chained in global deviceid hlist */ 37 struct nfs4_ff_layout_ds { 38 struct nfs4_deviceid_node id_node; 39 u32 ds_versions_cnt; 40 struct nfs4_ff_ds_version *ds_versions; 41 struct nfs4_pnfs_ds *ds; 42 }; 43 44 struct nfs4_ff_layout_ds_err { 45 struct list_head list; /* linked in mirror error_list */ 46 u64 offset; 47 u64 length; 48 int status; 49 enum nfs_opnum4 opnum; 50 nfs4_stateid stateid; 51 struct nfs4_deviceid deviceid; 52 }; 53 54 struct nfs4_ff_io_stat { 55 __u64 ops_requested; 56 __u64 bytes_requested; 57 __u64 ops_completed; 58 __u64 bytes_completed; 59 __u64 bytes_not_delivered; 60 ktime_t total_busy_time; 61 ktime_t aggregate_completion_time; 62 }; 63 64 struct nfs4_ff_busy_timer { 65 ktime_t start_time; 66 atomic_t n_ops; 67 }; 68 69 struct nfs4_ff_layoutstat { 70 struct nfs4_ff_io_stat io_stat; 71 struct nfs4_ff_busy_timer busy_timer; 72 }; 73 74 struct nfs4_ff_layout_mirror { 75 struct pnfs_layout_hdr *layout; 76 struct list_head mirrors; 77 u32 ds_count; 78 u32 efficiency; 79 struct nfs4_deviceid devid; 80 struct nfs4_ff_layout_ds *mirror_ds; 81 u32 fh_versions_cnt; 82 struct nfs_fh *fh_versions; 83 nfs4_stateid stateid; 84 const struct cred __rcu *ro_cred; 85 const struct cred __rcu *rw_cred; 86 struct nfs_file_localio nfl; 87 refcount_t ref; 88 spinlock_t lock; 89 unsigned long flags; 90 struct nfs4_ff_layoutstat read_stat; 91 struct nfs4_ff_layoutstat write_stat; 92 ktime_t start_time; 93 u32 report_interval; 94 }; 95 96 #define NFS4_FF_MIRROR_STAT_AVAIL (0) 97 98 struct nfs4_ff_layout_segment { 99 struct pnfs_layout_segment generic_hdr; 100 u64 stripe_unit; 101 u32 flags; 102 u32 mirror_array_cnt; 103 struct nfs4_ff_layout_mirror *mirror_array[] __counted_by(mirror_array_cnt); 104 }; 105 106 struct nfs4_flexfile_layout { 107 struct pnfs_layout_hdr generic_hdr; 108 struct pnfs_ds_commit_info commit_info; 109 struct list_head mirrors; 110 struct list_head error_list; /* nfs4_ff_layout_ds_err */ 111 ktime_t last_report_time; /* Layoutstat report times */ 112 }; 113 114 struct nfs4_flexfile_layoutreturn_args { 115 struct list_head errors; 116 struct nfs42_layoutstat_devinfo devinfo[FF_LAYOUTSTATS_MAXDEV]; 117 unsigned int num_errors; 118 unsigned int num_dev; 119 struct page *pages[1]; 120 }; 121 122 static inline struct nfs4_flexfile_layout * 123 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) 124 { 125 return container_of(lo, struct nfs4_flexfile_layout, generic_hdr); 126 } 127 128 static inline struct nfs4_ff_layout_segment * 129 FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg) 130 { 131 return container_of(lseg, 132 struct nfs4_ff_layout_segment, 133 generic_hdr); 134 } 135 136 static inline struct nfs4_ff_layout_ds * 137 FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node) 138 { 139 return container_of(node, struct nfs4_ff_layout_ds, id_node); 140 } 141 142 static inline struct nfs4_ff_layout_mirror * 143 FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx) 144 { 145 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 146 147 if (idx < fls->mirror_array_cnt) 148 return fls->mirror_array[idx]; 149 return NULL; 150 } 151 152 static inline struct nfs4_deviceid_node * 153 FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx) 154 { 155 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, idx); 156 157 if (mirror != NULL) { 158 struct nfs4_ff_layout_ds *mirror_ds = mirror->mirror_ds; 159 160 if (!IS_ERR_OR_NULL(mirror_ds)) 161 return &mirror_ds->id_node; 162 } 163 return NULL; 164 } 165 166 static inline u32 167 FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg) 168 { 169 return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt; 170 } 171 172 static inline bool 173 ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg) 174 { 175 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS; 176 } 177 178 static inline bool 179 ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg) 180 { 181 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_READ_IO; 182 } 183 184 static inline int 185 nfs4_ff_layout_ds_version(const struct nfs4_ff_layout_mirror *mirror) 186 { 187 return mirror->mirror_ds->ds_versions[0].version; 188 } 189 190 struct nfs4_ff_layout_ds * 191 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, 192 gfp_t gfp_flags); 193 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 194 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 195 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, 196 struct nfs4_ff_layout_mirror *mirror, u64 offset, 197 u64 length, int status, enum nfs_opnum4 opnum, 198 gfp_t gfp_flags); 199 void ff_layout_send_layouterror(struct pnfs_layout_segment *lseg); 200 int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head); 201 void ff_layout_free_ds_ioerr(struct list_head *head); 202 unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo, 203 const struct pnfs_layout_range *range, 204 struct list_head *head, 205 unsigned int maxnum); 206 struct nfs_fh * 207 nfs4_ff_layout_select_ds_fh(struct nfs4_ff_layout_mirror *mirror); 208 void 209 nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror, 210 nfs4_stateid *stateid); 211 212 struct nfs4_pnfs_ds * 213 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, 214 struct nfs4_ff_layout_mirror *mirror, 215 bool fail_return); 216 217 struct rpc_clnt * 218 nfs4_ff_find_or_create_ds_client(struct nfs4_ff_layout_mirror *mirror, 219 struct nfs_client *ds_clp, 220 struct inode *inode); 221 const struct cred *ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror, 222 const struct pnfs_layout_range *range, 223 const struct cred *mdscred); 224 bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg); 225 bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg); 226 227 #endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */ 228