2 * pNFS client data structures.
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
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14 * of this software without specific, written prior authorization. If
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17 * this software, then the disclaimer below must also be included.
19 * This software is provided as is, without representation or warranty
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21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
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26 * even if it has been or is hereafter advised of the possibility of
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 */
68 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
71 enum layoutdriver_policy_flags {
72 /* Should the pNFS client commit and return the layout upon a setattr */
73 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
74 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
77 struct nfs4_deviceid_node;
79 /* Per-layout driver specific registration structure */
80 struct pnfs_layoutdriver_type {
81 struct list_head pnfs_tblid;
87 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
88 int (*clear_layoutdriver) (struct nfs_server *);
90 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
91 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
93 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
94 void (*free_lseg) (struct pnfs_layout_segment *lseg);
96 /* test for nfs page cache coalescing */
97 const struct nfs_pageio_ops *pg_read_ops;
98 const struct nfs_pageio_ops *pg_write_ops;
100 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
101 void (*mark_request_commit) (struct nfs_page *req,
102 struct pnfs_layout_segment *lseg,
103 struct nfs_commit_info *cinfo);
104 void (*clear_request_commit) (struct nfs_page *req,
105 struct nfs_commit_info *cinfo);
106 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
108 void (*recover_commit_reqs) (struct list_head *list,
109 struct nfs_commit_info *cinfo);
110 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
112 int (*commit_pagelist)(struct inode *inode,
113 struct list_head *mds_pages,
115 struct nfs_commit_info *cinfo);
118 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
119 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
121 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
122 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
124 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
126 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
127 struct xdr_stream *xdr,
128 const struct nfs4_layoutreturn_args *args);
130 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
131 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
132 void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
133 struct xdr_stream *xdr,
134 const struct nfs4_layoutcommit_args *args);
137 struct pnfs_layout_hdr {
138 atomic_t plh_refcount;
139 struct list_head plh_layouts; /* other client layouts */
140 struct list_head plh_bulk_destroy;
141 struct list_head plh_segs; /* layout segments list */
142 nfs4_stateid plh_stateid;
143 atomic_t plh_outstanding; /* number of RPCs out */
144 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
145 u32 plh_barrier; /* ignore lower seqids */
146 unsigned long plh_retry_timestamp;
147 unsigned long plh_flags;
148 loff_t plh_lwb; /* last write byte for layoutcommit */
149 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
150 struct inode *plh_inode;
154 struct nfs4_deviceid dev_id;
155 unsigned int layout_type;
156 unsigned int mincount;
157 unsigned int maxcount; /* gdia_maxcount */
160 unsigned int pglen; /* reply buffer length */
163 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
165 struct pnfs_devicelist {
167 unsigned int num_devs;
168 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
171 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
172 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
175 extern int nfs4_proc_getdevicelist(struct nfs_server *server,
176 const struct nfs_fh *fh,
177 struct pnfs_devicelist *devlist);
178 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
179 struct pnfs_device *dev,
180 struct rpc_cred *cred);
181 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
182 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
185 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
186 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
187 void pnfs_put_lseg_async(struct pnfs_layout_segment *lseg);
189 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
190 void unset_pnfs_layoutdriver(struct nfs_server *);
191 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
192 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
193 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
194 struct nfs_page *req, u64 wb_size);
195 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
196 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
197 struct nfs_page *prev, struct nfs_page *req);
198 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
199 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
200 void pnfs_free_lseg_list(struct list_head *tmp_list);
201 void pnfs_destroy_layout(struct nfs_inode *);
202 void pnfs_destroy_all_layouts(struct nfs_client *);
203 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
204 struct nfs_fsid *fsid,
206 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
208 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
209 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
210 const nfs4_stateid *new,
211 bool update_barrier);
212 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
213 struct pnfs_layout_hdr *lo,
214 struct nfs4_state *open_state);
215 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
216 struct list_head *tmp_list,
217 struct pnfs_layout_range *recall_range);
218 bool pnfs_roc(struct inode *ino);
219 void pnfs_roc_release(struct inode *ino);
220 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
221 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
222 void pnfs_set_layoutcommit(struct nfs_pgio_header *);
223 void pnfs_commit_set_layoutcommit(struct nfs_commit_data *data);
224 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
225 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
226 int _pnfs_return_layout(struct inode *);
227 int pnfs_commit_and_return_layout(struct inode *);
228 void pnfs_ld_write_done(struct nfs_pgio_header *);
229 void pnfs_ld_read_done(struct nfs_pgio_header *);
230 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
231 struct nfs_open_context *ctx,
234 enum pnfs_iomode iomode,
237 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
238 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
239 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
240 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
242 /* nfs4_deviceid_flags */
244 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
245 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
249 struct nfs4_deviceid_node {
250 struct hlist_node node;
251 struct hlist_node tmpnode;
252 const struct pnfs_layoutdriver_type *ld;
253 const struct nfs_client *nfs_client;
255 unsigned long timestamp_unavailable;
256 struct nfs4_deviceid deviceid;
260 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
261 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
262 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
263 const struct pnfs_layoutdriver_type *,
264 const struct nfs_client *,
265 const struct nfs4_deviceid *);
266 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
267 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
268 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
269 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
270 void nfs4_deviceid_purge_client(const struct nfs_client *);
272 static inline struct pnfs_layout_segment *
273 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
276 atomic_inc(&lseg->pls_refcount);
277 smp_mb__after_atomic();
282 /* Return true if a layout driver is being used for this mountpoint */
283 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
285 return nfss->pnfs_curr_ld != NULL;
289 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
290 struct nfs_commit_info *cinfo)
292 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
293 return PNFS_NOT_ATTEMPTED;
294 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
297 static inline struct pnfs_ds_commit_info *
298 pnfs_get_ds_info(struct inode *inode)
300 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
302 if (ld == NULL || ld->get_ds_info == NULL)
304 return ld->get_ds_info(inode);
308 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
309 struct nfs_commit_info *cinfo)
311 struct inode *inode = req->wb_context->dentry->d_inode;
312 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
314 if (lseg == NULL || ld->mark_request_commit == NULL)
316 ld->mark_request_commit(req, lseg, cinfo);
321 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
323 struct inode *inode = req->wb_context->dentry->d_inode;
324 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
326 if (ld == NULL || ld->clear_request_commit == NULL)
328 ld->clear_request_commit(req, cinfo);
333 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
336 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
339 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
343 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
344 struct nfs_commit_info *cinfo)
346 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
348 NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
351 static inline struct nfs_page *
352 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
355 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
357 if (ld == NULL || ld->search_commit_reqs == NULL)
359 return ld->search_commit_reqs(cinfo, page);
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;
373 pnfs_layoutcommit_outstanding(struct inode *inode)
375 struct nfs_inode *nfsi = NFS_I(inode);
377 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
378 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
381 static inline int pnfs_return_layout(struct inode *ino)
383 struct nfs_inode *nfsi = NFS_I(ino);
384 struct nfs_server *nfss = NFS_SERVER(ino);
386 if (pnfs_enabled_sb(nfss) && nfsi->layout)
387 return _pnfs_return_layout(ino);
393 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
394 struct nfs_server *nfss)
396 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
397 nfss->pnfs_curr_ld->id == src->l_type);
401 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
403 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
406 #endif /* NFS_DEBUG */
407 #else /* CONFIG_NFS_V4_1 */
409 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
413 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
417 static inline struct pnfs_layout_segment *
418 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
423 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
427 static inline void pnfs_put_lseg_async(struct pnfs_layout_segment *lseg)
431 static inline int pnfs_return_layout(struct inode *ino)
436 static inline int pnfs_commit_and_return_layout(struct inode *inode)
442 pnfs_ld_layoutret_on_setattr(struct inode *inode)
448 pnfs_roc(struct inode *ino)
454 pnfs_roc_release(struct inode *ino)
459 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
464 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
469 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
470 const struct nfs_fh *mntfh, u32 id)
474 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
479 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
480 struct nfs_commit_info *cinfo)
482 return PNFS_NOT_ATTEMPTED;
485 static inline struct pnfs_ds_commit_info *
486 pnfs_get_ds_info(struct inode *inode)
492 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
493 struct nfs_commit_info *cinfo)
499 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
505 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
512 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
513 struct nfs_commit_info *cinfo)
517 static inline struct nfs_page *
518 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
524 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
530 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
531 struct nfs_server *nfss)
537 pnfs_layoutcommit_outstanding(struct inode *inode)
543 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
548 #endif /* CONFIG_NFS_V4_1 */
550 #endif /* FS_NFS_PNFS_H */