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>
37 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
38 NFS_LSEG_ROC, /* roc bit received from server */
41 struct pnfs_layout_segment {
42 struct list_head pls_list;
43 struct pnfs_layout_range pls_range;
44 atomic_t pls_refcount;
45 unsigned long pls_flags;
46 struct pnfs_layout_hdr *pls_layout;
47 struct rpc_cred *pls_lc_cred; /* LAYOUTCOMMIT credential */
48 loff_t pls_end_pos; /* LAYOUTCOMMIT write end */
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 */
68 struct nfs4_deviceid_node;
70 /* Per-layout driver specific registration structure */
71 struct pnfs_layoutdriver_type {
72 struct list_head pnfs_tblid;
77 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
78 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
80 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
81 void (*free_lseg) (struct pnfs_layout_segment *lseg);
83 /* test for nfs page cache coalescing */
84 int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
86 /* Returns true if layoutdriver wants to divert this request to
87 * driver's commit routine.
89 bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
90 struct list_head * (*choose_commit_list) (struct nfs_page *req);
91 int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
94 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
95 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
97 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
98 enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
100 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
103 struct pnfs_layout_hdr {
104 atomic_t plh_refcount;
105 struct list_head plh_layouts; /* other client layouts */
106 struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
107 struct list_head plh_segs; /* layout segments list */
108 nfs4_stateid plh_stateid;
109 atomic_t plh_outstanding; /* number of RPCs out */
110 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
111 u32 plh_barrier; /* ignore lower seqids */
112 unsigned long plh_flags;
113 struct inode *plh_inode;
117 struct nfs4_deviceid dev_id;
118 unsigned int layout_type;
119 unsigned int mincount;
125 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
126 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
129 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
130 struct pnfs_device *dev);
131 extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
134 void get_layout_hdr(struct pnfs_layout_hdr *lo);
135 void put_lseg(struct pnfs_layout_segment *lseg);
136 struct pnfs_layout_segment *
137 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
138 loff_t pos, u64 count, enum pnfs_iomode access_type,
140 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
141 void unset_pnfs_layoutdriver(struct nfs_server *);
142 enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
143 const struct rpc_call_ops *, int);
144 enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
145 const struct rpc_call_ops *);
146 void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
147 void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *);
148 int pnfs_layout_process(struct nfs4_layoutget *lgp);
149 void pnfs_free_lseg_list(struct list_head *tmp_list);
150 void pnfs_destroy_layout(struct nfs_inode *);
151 void pnfs_destroy_all_layouts(struct nfs_client *);
152 void put_layout_hdr(struct pnfs_layout_hdr *lo);
153 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
154 const nfs4_stateid *new,
155 bool update_barrier);
156 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
157 struct pnfs_layout_hdr *lo,
158 struct nfs4_state *open_state);
159 int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
160 struct list_head *tmp_list,
161 struct pnfs_layout_range *recall_range);
162 bool pnfs_roc(struct inode *ino);
163 void pnfs_roc_release(struct inode *ino);
164 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
165 bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
166 void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
167 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
170 struct nfs4_deviceid_node {
171 struct hlist_node node;
172 const struct pnfs_layoutdriver_type *ld;
173 const struct nfs_client *nfs_client;
174 struct nfs4_deviceid deviceid;
178 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
179 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
180 struct nfs4_deviceid_node *nfs4_unhash_put_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
181 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
182 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
183 const struct pnfs_layoutdriver_type *,
184 const struct nfs_client *,
185 const struct nfs4_deviceid *);
186 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
187 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
188 void nfs4_deviceid_purge_client(const struct nfs_client *);
190 static inline int lo_fail_bit(u32 iomode)
192 return iomode == IOMODE_RW ?
193 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
196 static inline struct pnfs_layout_segment *
197 get_lseg(struct pnfs_layout_segment *lseg)
200 atomic_inc(&lseg->pls_refcount);
201 smp_mb__after_atomic_inc();
206 /* Return true if a layout driver is being used for this mountpoint */
207 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
209 return nfss->pnfs_curr_ld != NULL;
213 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
216 struct pnfs_layoutdriver_type *ld;
218 ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
219 if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
220 set_bit(PG_PNFS_COMMIT, &req->wb_flags);
221 req->wb_commit_lseg = get_lseg(lseg);
227 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
229 if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
230 return PNFS_NOT_ATTEMPTED;
231 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
234 static inline struct list_head *
235 pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
237 struct list_head *rv;
239 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
240 struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
242 set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
243 rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
244 /* matched by ref taken when PG_PNFS_COMMIT is set */
245 put_lseg(req->wb_commit_lseg);
251 static inline void pnfs_clear_request_commit(struct nfs_page *req)
253 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
254 put_lseg(req->wb_commit_lseg);
257 #else /* CONFIG_NFS_V4_1 */
259 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
263 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
267 static inline struct pnfs_layout_segment *
268 get_lseg(struct pnfs_layout_segment *lseg)
273 static inline void put_lseg(struct pnfs_layout_segment *lseg)
277 static inline struct pnfs_layout_segment *
278 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
279 loff_t pos, u64 count, enum pnfs_iomode access_type,
285 static inline enum pnfs_try_status
286 pnfs_try_to_read_data(struct nfs_read_data *data,
287 const struct rpc_call_ops *call_ops)
289 return PNFS_NOT_ATTEMPTED;
292 static inline enum pnfs_try_status
293 pnfs_try_to_write_data(struct nfs_write_data *data,
294 const struct rpc_call_ops *call_ops, int how)
296 return PNFS_NOT_ATTEMPTED;
300 pnfs_roc(struct inode *ino)
306 pnfs_roc_release(struct inode *ino)
311 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
316 pnfs_roc_drain(struct inode *ino, u32 *barrier)
321 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
325 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
330 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino)
332 pgio->pg_test = NULL;
336 pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *ino)
338 pgio->pg_test = NULL;
342 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
347 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
349 return PNFS_NOT_ATTEMPTED;
352 static inline struct list_head *
353 pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
358 static inline void pnfs_clear_request_commit(struct nfs_page *req)
362 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
367 static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
370 #endif /* CONFIG_NFS_V4_1 */
372 #endif /* FS_NFS_PNFS_H */