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_DESTROYED, /* no new use of layout allowed */
66 NFS_LAYOUT_INVALID, /* layout is being destroyed */
67 NFS_LAYOUT_RETURNED, /* layout has already been returned */
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 int (*commit_pagelist)(struct inode *inode,
110 struct list_head *mds_pages,
112 struct nfs_commit_info *cinfo);
115 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
116 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
118 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
119 enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
121 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
123 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
124 struct xdr_stream *xdr,
125 const struct nfs4_layoutreturn_args *args);
127 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
129 void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
130 struct xdr_stream *xdr,
131 const struct nfs4_layoutcommit_args *args);
134 struct pnfs_layout_hdr {
135 atomic_t plh_refcount;
136 struct list_head plh_layouts; /* other client layouts */
137 struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
138 struct list_head plh_segs; /* layout segments list */
139 nfs4_stateid plh_stateid;
140 atomic_t plh_outstanding; /* number of RPCs out */
141 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
142 u32 plh_barrier; /* ignore lower seqids */
143 unsigned long plh_flags;
144 loff_t plh_lwb; /* last write byte for layoutcommit */
145 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
146 struct inode *plh_inode;
150 struct nfs4_deviceid dev_id;
151 unsigned int layout_type;
152 unsigned int mincount;
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 extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
176 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
179 void get_layout_hdr(struct pnfs_layout_hdr *lo);
180 void put_lseg(struct pnfs_layout_segment *lseg);
182 void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *,
183 const struct nfs_pgio_completion_ops *);
184 void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *,
185 int, const struct nfs_pgio_completion_ops *);
187 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
188 void unset_pnfs_layoutdriver(struct nfs_server *);
189 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
190 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
191 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *);
192 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
193 bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
194 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
195 int pnfs_layout_process(struct nfs4_layoutget *lgp);
196 void pnfs_free_lseg_list(struct list_head *tmp_list);
197 void pnfs_destroy_layout(struct nfs_inode *);
198 void pnfs_destroy_all_layouts(struct nfs_client *);
199 void put_layout_hdr(struct pnfs_layout_hdr *lo);
200 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
201 const nfs4_stateid *new,
202 bool update_barrier);
203 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
204 struct pnfs_layout_hdr *lo,
205 struct nfs4_state *open_state);
206 int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
207 struct list_head *tmp_list,
208 struct pnfs_layout_range *recall_range);
209 bool pnfs_roc(struct inode *ino);
210 void pnfs_roc_release(struct inode *ino);
211 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
212 bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
213 void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
214 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
215 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
216 int _pnfs_return_layout(struct inode *);
217 void pnfs_ld_write_done(struct nfs_write_data *);
218 void pnfs_ld_read_done(struct nfs_read_data *);
219 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
220 struct nfs_open_context *ctx,
223 enum pnfs_iomode iomode,
226 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
227 int pnfs_read_done_resend_to_mds(struct inode *inode, struct list_head *head,
228 const struct nfs_pgio_completion_ops *compl_ops);
229 int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *head,
230 const struct nfs_pgio_completion_ops *compl_ops);
231 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
233 /* nfs4_deviceid_flags */
235 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
239 struct nfs4_deviceid_node {
240 struct hlist_node node;
241 struct hlist_node tmpnode;
242 const struct pnfs_layoutdriver_type *ld;
243 const struct nfs_client *nfs_client;
245 struct nfs4_deviceid deviceid;
249 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
250 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
251 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
252 const struct pnfs_layoutdriver_type *,
253 const struct nfs_client *,
254 const struct nfs4_deviceid *);
255 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
256 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
257 void nfs4_deviceid_purge_client(const struct nfs_client *);
260 pnfs_mark_layout_returned(struct pnfs_layout_hdr *lo)
262 set_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
266 pnfs_clear_layout_returned(struct pnfs_layout_hdr *lo)
268 clear_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
272 pnfs_test_layout_returned(struct pnfs_layout_hdr *lo)
274 return test_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
277 static inline int lo_fail_bit(u32 iomode)
279 return iomode == IOMODE_RW ?
280 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
283 static inline struct pnfs_layout_segment *
284 get_lseg(struct pnfs_layout_segment *lseg)
287 atomic_inc(&lseg->pls_refcount);
288 smp_mb__after_atomic_inc();
293 /* Return true if a layout driver is being used for this mountpoint */
294 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
296 return nfss->pnfs_curr_ld != NULL;
300 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
301 struct nfs_commit_info *cinfo)
303 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
304 return PNFS_NOT_ATTEMPTED;
305 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
308 static inline struct pnfs_ds_commit_info *
309 pnfs_get_ds_info(struct inode *inode)
311 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
313 if (ld == NULL || ld->get_ds_info == NULL)
315 return ld->get_ds_info(inode);
319 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
320 struct nfs_commit_info *cinfo)
322 struct inode *inode = req->wb_context->dentry->d_inode;
323 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
325 if (lseg == NULL || ld->mark_request_commit == NULL)
327 ld->mark_request_commit(req, lseg, cinfo);
332 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
334 struct inode *inode = req->wb_context->dentry->d_inode;
335 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
337 if (ld == NULL || ld->clear_request_commit == NULL)
339 ld->clear_request_commit(req, cinfo);
344 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
347 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
350 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
354 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
355 struct nfs_commit_info *cinfo)
357 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
359 NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
362 /* Should the pNFS client commit and return the layout upon a setattr */
364 pnfs_ld_layoutret_on_setattr(struct inode *inode)
366 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
368 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
369 PNFS_LAYOUTRET_ON_SETATTR;
372 static inline int pnfs_return_layout(struct inode *ino)
374 struct nfs_inode *nfsi = NFS_I(ino);
375 struct nfs_server *nfss = NFS_SERVER(ino);
377 if (pnfs_enabled_sb(nfss) && nfsi->layout)
378 return _pnfs_return_layout(ino);
384 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
385 struct nfs_server *nfss)
387 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
388 nfss->pnfs_curr_ld->id == src->l_type);
392 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
394 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
397 #endif /* NFS_DEBUG */
398 #else /* CONFIG_NFS_V4_1 */
400 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
404 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
408 static inline struct pnfs_layout_segment *
409 get_lseg(struct pnfs_layout_segment *lseg)
414 static inline void put_lseg(struct pnfs_layout_segment *lseg)
418 static inline int pnfs_return_layout(struct inode *ino)
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)
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)
460 static inline void pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
461 const struct nfs_pgio_completion_ops *compl_ops)
463 nfs_pageio_init_read(pgio, inode, compl_ops);
466 static inline void pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags,
467 const struct nfs_pgio_completion_ops *compl_ops)
469 nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
473 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
474 struct nfs_commit_info *cinfo)
476 return PNFS_NOT_ATTEMPTED;
479 static inline struct pnfs_ds_commit_info *
480 pnfs_get_ds_info(struct inode *inode)
486 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
487 struct nfs_commit_info *cinfo)
493 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
499 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
506 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
507 struct nfs_commit_info *cinfo)
511 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
517 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
518 struct nfs_server *nfss)
523 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
528 #endif /* CONFIG_NFS_V4_1 */
530 #endif /* FS_NFS_PNFS_H */