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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 "../pnfs.h"
18
19
20
21#define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
22
23
24#define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L)
25#define FF_LAYOUTSTATS_MAXDEV 4
26
27struct nfs4_ff_ds_version {
28 u32 version;
29 u32 minor_version;
30 u32 rsize;
31 u32 wsize;
32 bool tightly_coupled;
33};
34
35
36struct nfs4_ff_layout_ds {
37 struct nfs4_deviceid_node id_node;
38 u32 ds_versions_cnt;
39 struct nfs4_ff_ds_version *ds_versions;
40 struct nfs4_pnfs_ds *ds;
41};
42
43struct nfs4_ff_layout_ds_err {
44 struct list_head list;
45 u64 offset;
46 u64 length;
47 int status;
48 enum nfs_opnum4 opnum;
49 nfs4_stateid stateid;
50 struct nfs4_deviceid deviceid;
51};
52
53struct nfs4_ff_io_stat {
54 __u64 ops_requested;
55 __u64 bytes_requested;
56 __u64 ops_completed;
57 __u64 bytes_completed;
58 __u64 bytes_not_delivered;
59 ktime_t total_busy_time;
60 ktime_t aggregate_completion_time;
61};
62
63struct nfs4_ff_busy_timer {
64 ktime_t start_time;
65 atomic_t n_ops;
66};
67
68struct nfs4_ff_layoutstat {
69 struct nfs4_ff_io_stat io_stat;
70 struct nfs4_ff_busy_timer busy_timer;
71};
72
73struct nfs4_ff_layout_mirror {
74 struct pnfs_layout_hdr *layout;
75 struct list_head mirrors;
76 u32 ds_count;
77 u32 efficiency;
78 struct nfs4_deviceid devid;
79 struct nfs4_ff_layout_ds *mirror_ds;
80 u32 fh_versions_cnt;
81 struct nfs_fh *fh_versions;
82 nfs4_stateid stateid;
83 struct rpc_cred __rcu *ro_cred;
84 struct rpc_cred __rcu *rw_cred;
85 atomic_t ref;
86 spinlock_t lock;
87 unsigned long flags;
88 struct nfs4_ff_layoutstat read_stat;
89 struct nfs4_ff_layoutstat write_stat;
90 ktime_t start_time;
91 u32 report_interval;
92};
93
94#define NFS4_FF_MIRROR_STAT_AVAIL (0)
95
96struct nfs4_ff_layout_segment {
97 struct pnfs_layout_segment generic_hdr;
98 u64 stripe_unit;
99 u32 flags;
100 u32 mirror_array_cnt;
101 struct nfs4_ff_layout_mirror **mirror_array;
102};
103
104struct nfs4_flexfile_layout {
105 struct pnfs_layout_hdr generic_hdr;
106 struct pnfs_ds_commit_info commit_info;
107 struct list_head mirrors;
108 struct list_head error_list;
109 ktime_t last_report_time;
110};
111
112struct nfs4_flexfile_layoutreturn_args {
113 struct list_head errors;
114 struct nfs42_layoutstat_devinfo devinfo[FF_LAYOUTSTATS_MAXDEV];
115 unsigned int num_errors;
116 unsigned int num_dev;
117 struct page *pages[1];
118};
119
120static inline struct nfs4_flexfile_layout *
121FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
122{
123 return container_of(lo, struct nfs4_flexfile_layout, generic_hdr);
124}
125
126static inline struct nfs4_ff_layout_segment *
127FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
128{
129 return container_of(lseg,
130 struct nfs4_ff_layout_segment,
131 generic_hdr);
132}
133
134static inline struct nfs4_deviceid_node *
135FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
136{
137 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt ||
138 FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL ||
139 FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL)
140 return NULL;
141 return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node;
142}
143
144static inline struct nfs4_ff_layout_ds *
145FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
146{
147 return container_of(node, struct nfs4_ff_layout_ds, id_node);
148}
149
150static inline struct nfs4_ff_layout_mirror *
151FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
152{
153 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt)
154 return NULL;
155 return FF_LAYOUT_LSEG(lseg)->mirror_array[idx];
156}
157
158static inline u32
159FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg)
160{
161 return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt;
162}
163
164static inline bool
165ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg)
166{
167 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS;
168}
169
170static inline bool
171ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg)
172{
173 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_READ_IO;
174}
175
176static inline bool
177ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)
178{
179
180
181
182
183 if (nfs4_test_deviceid_unavailable(node)) {
184 u32 *p = (u32 *)node->deviceid.data;
185
186 pr_warn_ratelimited("NFS: flexfiles layout referencing an "
187 "unavailable device [%x%x%x%x]\n",
188 p[0], p[1], p[2], p[3]);
189 return true;
190 }
191 return false;
192}
193
194static inline int
195nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx)
196{
197 return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version;
198}
199
200struct nfs4_ff_layout_ds *
201nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
202 gfp_t gfp_flags);
203void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
204void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
205int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
206 struct nfs4_ff_layout_mirror *mirror, u64 offset,
207 u64 length, int status, enum nfs_opnum4 opnum,
208 gfp_t gfp_flags);
209int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head);
210void ff_layout_free_ds_ioerr(struct list_head *head);
211unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
212 const struct pnfs_layout_range *range,
213 struct list_head *head,
214 unsigned int maxnum);
215struct nfs_fh *
216nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);
217
218struct nfs4_pnfs_ds *
219nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
220 bool fail_return);
221
222struct rpc_clnt *
223nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg,
224 u32 ds_idx,
225 struct nfs_client *ds_clp,
226 struct inode *inode);
227struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
228 u32 ds_idx, struct rpc_cred *mdscred);
229bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg);
230bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg);
231
232#endif
233
