2 * pNFS client data structures.
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33 #include <linux/nfs_fs.h>
34 #include <linux/nfs_page.h>
35 #include <linux/workqueue.h>
38 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
39 NFS_LSEG_ROC, /* roc bit received from server */
40 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
43 struct pnfs_layout_segment {
44 struct list_head pls_list;
45 struct list_head pls_lc_list;
46 struct pnfs_layout_range pls_range;
47 atomic_t pls_refcount;
48 unsigned long pls_flags;
49 struct pnfs_layout_hdr *pls_layout;
50 struct work_struct pls_work;
53 enum pnfs_try_status {
55 PNFS_NOT_ATTEMPTED = 1,
58 #ifdef CONFIG_NFS_V4_1
60 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
63 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
64 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
65 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
66 NFS_LAYOUT_ROC, /* some lseg had roc bit set */
67 NFS_LAYOUT_RETURN, /* Return this layout ASAP */
70 enum layoutdriver_policy_flags {
71 /* Should the pNFS client commit and return the layout upon a setattr */
72 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
73 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
76 struct nfs4_deviceid_node;
78 /* Per-layout driver specific registration structure */
79 struct pnfs_layoutdriver_type {
80 struct list_head pnfs_tblid;
86 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
87 int (*clear_layoutdriver) (struct nfs_server *);
89 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
90 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
92 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
93 void (*free_lseg) (struct pnfs_layout_segment *lseg);
95 /* test for nfs page cache coalescing */
96 const struct nfs_pageio_ops *pg_read_ops;
97 const struct nfs_pageio_ops *pg_write_ops;
99 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
100 void (*mark_request_commit) (struct nfs_page *req,
101 struct pnfs_layout_segment *lseg,
102 struct nfs_commit_info *cinfo);
103 void (*clear_request_commit) (struct nfs_page *req,
104 struct nfs_commit_info *cinfo);
105 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
107 void (*recover_commit_reqs) (struct list_head *list,
108 struct nfs_commit_info *cinfo);
109 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
111 int (*commit_pagelist)(struct inode *inode,
112 struct list_head *mds_pages,
114 struct nfs_commit_info *cinfo);
117 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
118 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
120 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
121 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
123 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
125 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
126 struct xdr_stream *xdr,
127 const struct nfs4_layoutreturn_args *args);
129 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
131 void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
132 struct xdr_stream *xdr,
133 const struct nfs4_layoutcommit_args *args);
136 struct pnfs_layout_hdr {
137 atomic_t plh_refcount;
138 struct list_head plh_layouts; /* other client layouts */
139 struct list_head plh_bulk_destroy;
140 struct list_head plh_segs; /* layout segments list */
141 nfs4_stateid plh_stateid;
142 atomic_t plh_outstanding; /* number of RPCs out */
143 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
144 u32 plh_barrier; /* ignore lower seqids */
145 unsigned long plh_retry_timestamp;
146 unsigned long plh_flags;
147 loff_t plh_lwb; /* last write byte for layoutcommit */
148 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
149 struct inode *plh_inode;
153 struct nfs4_deviceid dev_id;
154 unsigned int layout_type;
155 unsigned int mincount;
156 unsigned int maxcount; /* gdia_maxcount */
159 unsigned int pglen; /* reply buffer length */
162 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
164 struct pnfs_devicelist {
166 unsigned int num_devs;
167 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
170 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
171 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
174 extern int nfs4_proc_getdevicelist(struct nfs_server *server,
175 const struct nfs_fh *fh,
176 struct pnfs_devicelist *devlist);
177 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
178 struct pnfs_device *dev,
179 struct rpc_cred *cred);
180 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
181 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
184 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
185 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
186 void pnfs_put_lseg_async(struct pnfs_layout_segment *lseg);
188 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
189 void unset_pnfs_layoutdriver(struct nfs_server *);
190 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
191 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
192 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
193 struct nfs_page *req, u64 wb_size);
194 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
195 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
196 struct nfs_page *prev, struct nfs_page *req);
197 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
198 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
199 void pnfs_free_lseg_list(struct list_head *tmp_list);
200 void pnfs_destroy_layout(struct nfs_inode *);
201 void pnfs_destroy_all_layouts(struct nfs_client *);
202 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
203 struct nfs_fsid *fsid,
205 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
207 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
208 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
209 const nfs4_stateid *new,
210 bool update_barrier);
211 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
212 struct pnfs_layout_hdr *lo,
213 struct nfs4_state *open_state);
214 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
215 struct list_head *tmp_list,
216 struct pnfs_layout_range *recall_range);
217 bool pnfs_roc(struct inode *ino);
218 void pnfs_roc_release(struct inode *ino);
219 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
220 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
221 void pnfs_set_layoutcommit(struct nfs_pgio_header *);
222 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
223 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
224 int _pnfs_return_layout(struct inode *);
225 int pnfs_commit_and_return_layout(struct inode *);
226 void pnfs_ld_write_done(struct nfs_pgio_header *);
227 void pnfs_ld_read_done(struct nfs_pgio_header *);
228 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
229 struct nfs_open_context *ctx,
232 enum pnfs_iomode iomode,
235 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
236 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
237 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
238 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
240 /* nfs4_deviceid_flags */
242 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
243 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
247 struct nfs4_deviceid_node {
248 struct hlist_node node;
249 struct hlist_node tmpnode;
250 const struct pnfs_layoutdriver_type *ld;
251 const struct nfs_client *nfs_client;
253 unsigned long timestamp_unavailable;
254 struct nfs4_deviceid deviceid;
258 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
259 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
260 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
261 const struct pnfs_layoutdriver_type *,
262 const struct nfs_client *,
263 const struct nfs4_deviceid *);
264 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
265 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
266 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
267 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
268 void nfs4_deviceid_purge_client(const struct nfs_client *);
270 static inline struct pnfs_layout_segment *
271 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
274 atomic_inc(&lseg->pls_refcount);
275 smp_mb__after_atomic();
280 /* Return true if a layout driver is being used for this mountpoint */
281 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
283 return nfss->pnfs_curr_ld != NULL;
287 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
288 struct nfs_commit_info *cinfo)
290 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
291 return PNFS_NOT_ATTEMPTED;
292 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
295 static inline struct pnfs_ds_commit_info *
296 pnfs_get_ds_info(struct inode *inode)
298 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
300 if (ld == NULL || ld->get_ds_info == NULL)
302 return ld->get_ds_info(inode);
306 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
307 struct nfs_commit_info *cinfo)
309 struct inode *inode = req->wb_context->dentry->d_inode;
310 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
312 if (lseg == NULL || ld->mark_request_commit == NULL)
314 ld->mark_request_commit(req, lseg, cinfo);
319 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
321 struct inode *inode = req->wb_context->dentry->d_inode;
322 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
324 if (ld == NULL || ld->clear_request_commit == NULL)
326 ld->clear_request_commit(req, cinfo);
331 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
334 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
337 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
341 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
342 struct nfs_commit_info *cinfo)
344 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
346 NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
349 static inline struct nfs_page *
350 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
353 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
355 if (ld == NULL || ld->search_commit_reqs == NULL)
357 return ld->search_commit_reqs(cinfo, page);
360 /* Should the pNFS client commit and return the layout upon a setattr */
362 pnfs_ld_layoutret_on_setattr(struct inode *inode)
364 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
366 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
367 PNFS_LAYOUTRET_ON_SETATTR;
371 pnfs_layoutcommit_outstanding(struct inode *inode)
373 struct nfs_inode *nfsi = NFS_I(inode);
375 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
376 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
379 static inline int pnfs_return_layout(struct inode *ino)
381 struct nfs_inode *nfsi = NFS_I(ino);
382 struct nfs_server *nfss = NFS_SERVER(ino);
384 if (pnfs_enabled_sb(nfss) && nfsi->layout)
385 return _pnfs_return_layout(ino);
391 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
392 struct nfs_server *nfss)
394 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
395 nfss->pnfs_curr_ld->id == src->l_type);
399 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
401 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
404 #endif /* NFS_DEBUG */
405 #else /* CONFIG_NFS_V4_1 */
407 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
411 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
415 static inline struct pnfs_layout_segment *
416 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
421 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
425 static inline void pnfs_put_lseg_async(struct pnfs_layout_segment *lseg)
429 static inline int pnfs_return_layout(struct inode *ino)
434 static inline int pnfs_commit_and_return_layout(struct inode *inode)
440 pnfs_ld_layoutret_on_setattr(struct inode *inode)
446 pnfs_roc(struct inode *ino)
452 pnfs_roc_release(struct inode *ino)
457 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
462 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
467 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
468 const struct nfs_fh *mntfh, u32 id)
472 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
477 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
478 struct nfs_commit_info *cinfo)
480 return PNFS_NOT_ATTEMPTED;
483 static inline struct pnfs_ds_commit_info *
484 pnfs_get_ds_info(struct inode *inode)
490 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
491 struct nfs_commit_info *cinfo)
497 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
503 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
510 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
511 struct nfs_commit_info *cinfo)
515 static inline struct nfs_page *
516 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
522 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
528 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
529 struct nfs_server *nfss)
535 pnfs_layoutcommit_outstanding(struct inode *inode)
541 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
546 #endif /* CONFIG_NFS_V4_1 */
548 #endif /* FS_NFS_PNFS_H */