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
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
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,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
33 #include <linux/nfs_page.h>
36 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
37 NFS_LSEG_ROC, /* roc bit received from server */
40 struct pnfs_layout_segment {
41 struct list_head pls_list;
42 struct pnfs_layout_range pls_range;
43 atomic_t pls_refcount;
44 unsigned long pls_flags;
45 struct pnfs_layout_hdr *pls_layout;
48 enum pnfs_try_status {
50 PNFS_NOT_ATTEMPTED = 1,
53 #ifdef CONFIG_NFS_V4_1
55 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
58 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
59 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
60 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
61 NFS_LAYOUT_ROC, /* some lseg had roc bit set */
62 NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
65 /* Per-layout driver specific registration structure */
66 struct pnfs_layoutdriver_type {
67 struct list_head pnfs_tblid;
71 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
72 void (*free_lseg) (struct pnfs_layout_segment *lseg);
74 /* test for nfs page cache coalescing */
75 int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
78 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
79 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
81 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
84 struct pnfs_layout_hdr {
85 atomic_t plh_refcount;
86 struct list_head plh_layouts; /* other client layouts */
87 struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
88 struct list_head plh_segs; /* layout segments list */
89 nfs4_stateid plh_stateid;
90 atomic_t plh_outstanding; /* number of RPCs out */
91 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
92 u32 plh_barrier; /* ignore lower seqids */
93 unsigned long plh_flags;
94 struct inode *plh_inode;
98 struct nfs4_deviceid dev_id;
99 unsigned int layout_type;
100 unsigned int mincount;
107 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
108 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
111 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
112 struct pnfs_device *dev);
113 extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
116 void get_layout_hdr(struct pnfs_layout_hdr *lo);
117 void put_lseg(struct pnfs_layout_segment *lseg);
118 struct pnfs_layout_segment *
119 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
120 enum pnfs_iomode access_type);
121 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
122 void unset_pnfs_layoutdriver(struct nfs_server *);
123 enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
124 const struct rpc_call_ops *);
125 void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
126 int pnfs_layout_process(struct nfs4_layoutget *lgp);
127 void pnfs_free_lseg_list(struct list_head *tmp_list);
128 void pnfs_destroy_layout(struct nfs_inode *);
129 void pnfs_destroy_all_layouts(struct nfs_client *);
130 void put_layout_hdr(struct pnfs_layout_hdr *lo);
131 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
132 const nfs4_stateid *new,
133 bool update_barrier);
134 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
135 struct pnfs_layout_hdr *lo,
136 struct nfs4_state *open_state);
137 int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
138 struct list_head *tmp_list,
140 bool pnfs_roc(struct inode *ino);
141 void pnfs_roc_release(struct inode *ino);
142 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
143 bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
146 static inline int lo_fail_bit(u32 iomode)
148 return iomode == IOMODE_RW ?
149 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
152 static inline struct pnfs_layout_segment *
153 get_lseg(struct pnfs_layout_segment *lseg)
156 atomic_inc(&lseg->pls_refcount);
157 smp_mb__after_atomic_inc();
162 /* Return true if a layout driver is being used for this mountpoint */
163 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
165 return nfss->pnfs_curr_ld != NULL;
168 #else /* CONFIG_NFS_V4_1 */
170 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
174 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
178 static inline struct pnfs_layout_segment *
179 get_lseg(struct pnfs_layout_segment *lseg)
184 static inline void put_lseg(struct pnfs_layout_segment *lseg)
188 static inline struct pnfs_layout_segment *
189 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
190 enum pnfs_iomode access_type)
195 static inline enum pnfs_try_status
196 pnfs_try_to_read_data(struct nfs_read_data *data,
197 const struct rpc_call_ops *call_ops)
199 return PNFS_NOT_ATTEMPTED;
203 pnfs_roc(struct inode *ino)
209 pnfs_roc_release(struct inode *ino)
214 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
219 pnfs_roc_drain(struct inode *ino, u32 *barrier)
224 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
228 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
233 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino)
235 pgio->pg_test = NULL;
238 #endif /* CONFIG_NFS_V4_1 */
240 #endif /* FS_NFS_PNFS_H */