2 * pNFS client data structures.
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33 #include <linux/nfs_fs.h>
34 #include <linux/nfs_page.h>
37 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
38 NFS_LSEG_ROC, /* roc bit received from server */
39 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
42 struct pnfs_layout_segment {
43 struct list_head pls_list;
44 struct list_head pls_lc_list;
45 struct pnfs_layout_range pls_range;
46 atomic_t pls_refcount;
47 unsigned long pls_flags;
48 struct pnfs_layout_hdr *pls_layout;
51 enum pnfs_try_status {
53 PNFS_NOT_ATTEMPTED = 1,
56 #ifdef CONFIG_NFS_V4_1
58 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
61 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
62 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
63 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
64 NFS_LAYOUT_ROC, /* some lseg had roc bit set */
65 NFS_LAYOUT_RETURN, /* Return this layout ASAP */
68 enum layoutdriver_policy_flags {
69 /* Should the pNFS client commit and return the layout upon a setattr */
70 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
71 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
74 struct nfs4_deviceid_node;
76 /* Per-layout driver specific registration structure */
77 struct pnfs_layoutdriver_type {
78 struct list_head pnfs_tblid;
84 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
85 int (*clear_layoutdriver) (struct nfs_server *);
87 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
88 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
90 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
91 void (*free_lseg) (struct pnfs_layout_segment *lseg);
93 /* test for nfs page cache coalescing */
94 const struct nfs_pageio_ops *pg_read_ops;
95 const struct nfs_pageio_ops *pg_write_ops;
97 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
98 void (*mark_request_commit) (struct nfs_page *req,
99 struct pnfs_layout_segment *lseg,
100 struct nfs_commit_info *cinfo);
101 void (*clear_request_commit) (struct nfs_page *req,
102 struct nfs_commit_info *cinfo);
103 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
105 void (*recover_commit_reqs) (struct list_head *list,
106 struct nfs_commit_info *cinfo);
107 int (*commit_pagelist)(struct inode *inode,
108 struct list_head *mds_pages,
110 struct nfs_commit_info *cinfo);
113 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
114 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
116 enum pnfs_try_status (*read_pagelist) (struct nfs_pgio_data *nfs_data);
117 enum pnfs_try_status (*write_pagelist) (struct nfs_pgio_data *nfs_data, int how);
119 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
121 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
122 struct xdr_stream *xdr,
123 const struct nfs4_layoutreturn_args *args);
125 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
127 void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
128 struct xdr_stream *xdr,
129 const struct nfs4_layoutcommit_args *args);
132 struct pnfs_layout_hdr {
133 atomic_t plh_refcount;
134 struct list_head plh_layouts; /* other client layouts */
135 struct list_head plh_bulk_destroy;
136 struct list_head plh_segs; /* layout segments list */
137 nfs4_stateid plh_stateid;
138 atomic_t plh_outstanding; /* number of RPCs out */
139 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
140 u32 plh_barrier; /* ignore lower seqids */
141 unsigned long plh_retry_timestamp;
142 unsigned long plh_flags;
143 loff_t plh_lwb; /* last write byte for layoutcommit */
144 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
145 struct inode *plh_inode;
149 struct nfs4_deviceid dev_id;
150 unsigned int layout_type;
151 unsigned int mincount;
152 unsigned int maxcount; /* gdia_maxcount */
155 unsigned int pglen; /* reply buffer length */
158 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
160 struct pnfs_devicelist {
162 unsigned int num_devs;
163 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
166 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
167 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
170 extern int nfs4_proc_getdevicelist(struct nfs_server *server,
171 const struct nfs_fh *fh,
172 struct pnfs_devicelist *devlist);
173 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
174 struct pnfs_device *dev,
175 struct rpc_cred *cred);
176 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
177 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
180 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
181 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
183 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
184 void unset_pnfs_layoutdriver(struct nfs_server *);
185 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
186 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
187 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
188 struct nfs_page *req, u64 wb_size);
189 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
190 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
191 struct nfs_page *prev, struct nfs_page *req);
192 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
193 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
194 void pnfs_free_lseg_list(struct list_head *tmp_list);
195 void pnfs_destroy_layout(struct nfs_inode *);
196 void pnfs_destroy_all_layouts(struct nfs_client *);
197 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
198 struct nfs_fsid *fsid,
200 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
202 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
203 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
204 const nfs4_stateid *new,
205 bool update_barrier);
206 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
207 struct pnfs_layout_hdr *lo,
208 struct nfs4_state *open_state);
209 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
210 struct list_head *tmp_list,
211 struct pnfs_layout_range *recall_range);
212 bool pnfs_roc(struct inode *ino);
213 void pnfs_roc_release(struct inode *ino);
214 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
215 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
216 void pnfs_set_layoutcommit(struct nfs_pgio_data *wdata);
217 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
218 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
219 int _pnfs_return_layout(struct inode *);
220 int pnfs_commit_and_return_layout(struct inode *);
221 void pnfs_ld_write_done(struct nfs_pgio_data *);
222 void pnfs_ld_read_done(struct nfs_pgio_data *);
223 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
224 struct nfs_open_context *ctx,
227 enum pnfs_iomode iomode,
230 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
231 int pnfs_read_done_resend_to_mds(struct inode *inode, struct list_head *head,
232 const struct nfs_pgio_completion_ops *compl_ops,
233 struct nfs_direct_req *dreq);
234 int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *head,
235 const struct nfs_pgio_completion_ops *compl_ops,
236 struct nfs_direct_req *dreq);
237 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
239 /* nfs4_deviceid_flags */
241 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
242 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
246 struct nfs4_deviceid_node {
247 struct hlist_node node;
248 struct hlist_node tmpnode;
249 const struct pnfs_layoutdriver_type *ld;
250 const struct nfs_client *nfs_client;
252 unsigned long timestamp_unavailable;
253 struct nfs4_deviceid deviceid;
257 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
258 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
259 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
260 const struct pnfs_layoutdriver_type *,
261 const struct nfs_client *,
262 const struct nfs4_deviceid *);
263 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
264 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
265 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
266 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
267 void nfs4_deviceid_purge_client(const struct nfs_client *);
269 static inline struct pnfs_layout_segment *
270 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
273 atomic_inc(&lseg->pls_refcount);
274 smp_mb__after_atomic();
279 /* Return true if a layout driver is being used for this mountpoint */
280 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
282 return nfss->pnfs_curr_ld != NULL;
286 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
287 struct nfs_commit_info *cinfo)
289 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
290 return PNFS_NOT_ATTEMPTED;
291 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
294 static inline struct pnfs_ds_commit_info *
295 pnfs_get_ds_info(struct inode *inode)
297 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
299 if (ld == NULL || ld->get_ds_info == NULL)
301 return ld->get_ds_info(inode);
305 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
306 struct nfs_commit_info *cinfo)
308 struct inode *inode = req->wb_context->dentry->d_inode;
309 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
311 if (lseg == NULL || ld->mark_request_commit == NULL)
313 ld->mark_request_commit(req, lseg, cinfo);
318 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
320 struct inode *inode = req->wb_context->dentry->d_inode;
321 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
323 if (ld == NULL || ld->clear_request_commit == NULL)
325 ld->clear_request_commit(req, cinfo);
330 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
333 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
336 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
340 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
341 struct nfs_commit_info *cinfo)
343 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
345 NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
348 /* Should the pNFS client commit and return the layout upon a setattr */
350 pnfs_ld_layoutret_on_setattr(struct inode *inode)
352 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
354 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
355 PNFS_LAYOUTRET_ON_SETATTR;
359 pnfs_layoutcommit_outstanding(struct inode *inode)
361 struct nfs_inode *nfsi = NFS_I(inode);
363 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
364 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
367 static inline int pnfs_return_layout(struct inode *ino)
369 struct nfs_inode *nfsi = NFS_I(ino);
370 struct nfs_server *nfss = NFS_SERVER(ino);
372 if (pnfs_enabled_sb(nfss) && nfsi->layout)
373 return _pnfs_return_layout(ino);
379 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
380 struct nfs_server *nfss)
382 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
383 nfss->pnfs_curr_ld->id == src->l_type);
387 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
389 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
392 #endif /* NFS_DEBUG */
393 #else /* CONFIG_NFS_V4_1 */
395 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
399 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
403 static inline struct pnfs_layout_segment *
404 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
409 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
413 static inline int pnfs_return_layout(struct inode *ino)
418 static inline int pnfs_commit_and_return_layout(struct inode *inode)
424 pnfs_ld_layoutret_on_setattr(struct inode *inode)
430 pnfs_roc(struct inode *ino)
436 pnfs_roc_release(struct inode *ino)
441 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
446 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
451 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
452 const struct nfs_fh *mntfh, u32 id)
456 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
461 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
462 struct nfs_commit_info *cinfo)
464 return PNFS_NOT_ATTEMPTED;
467 static inline struct pnfs_ds_commit_info *
468 pnfs_get_ds_info(struct inode *inode)
474 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
475 struct nfs_commit_info *cinfo)
481 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
487 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
494 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
495 struct nfs_commit_info *cinfo)
499 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
505 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
506 struct nfs_server *nfss)
512 pnfs_layoutcommit_outstanding(struct inode *inode)
518 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
523 #endif /* CONFIG_NFS_V4_1 */
525 #endif /* FS_NFS_PNFS_H */