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1 | /* |
2 | * Data types and function declerations for interfacing with the | |
3 | * pNFS standard object layout driver. | |
4 | * | |
5 | * Copyright (C) 2007 Panasas Inc. [year of first publication] | |
6 | * All rights reserved. | |
7 | * | |
8 | * Benny Halevy <bhalevy@panasas.com> | |
9 | * Boaz Harrosh <bharrosh@panasas.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 | |
13 | * See the file COPYING included with this distribution for more details. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * 3. Neither the name of the Panasas company nor the names of its | |
25 | * contributors may be used to endorse or promote products derived | |
26 | * from this software without specific prior written permission. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
29 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
30 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
31 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
32 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
33 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
34 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
35 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
36 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
37 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
38 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
39 | */ | |
40 | ||
41 | #ifndef _OBJLAYOUT_H | |
42 | #define _OBJLAYOUT_H | |
43 | ||
44 | #include <linux/nfs_fs.h> | |
45 | #include <linux/pnfs_osd_xdr.h> | |
46 | #include "../pnfs.h" | |
47 | ||
e51b841d BH |
48 | /* |
49 | * per-inode layout | |
50 | */ | |
51 | struct objlayout { | |
52 | struct pnfs_layout_hdr pnfs_layout; | |
adb58535 | 53 | |
a0fe8bf4 BH |
54 | /* for layout_commit */ |
55 | enum osd_delta_space_valid_enum { | |
56 | OBJ_DSU_INIT = 0, | |
57 | OBJ_DSU_VALID, | |
58 | OBJ_DSU_INVALID, | |
59 | } delta_space_valid; | |
60 | s64 delta_space_used; /* consumed by write ops */ | |
61 | ||
adb58535 BH |
62 | /* for layout_return */ |
63 | spinlock_t lock; | |
64 | struct list_head err_list; | |
e51b841d BH |
65 | }; |
66 | ||
67 | static inline struct objlayout * | |
68 | OBJLAYOUT(struct pnfs_layout_hdr *lo) | |
69 | { | |
70 | return container_of(lo, struct objlayout, pnfs_layout); | |
71 | } | |
72 | ||
04f83450 BH |
73 | /* |
74 | * per-I/O operation state | |
75 | * embedded in objects provider io_state data structure | |
76 | */ | |
77 | struct objlayout_io_state { | |
78 | struct pnfs_layout_segment *lseg; | |
79 | ||
80 | struct page **pages; | |
81 | unsigned pgbase; | |
82 | unsigned nr_pages; | |
83 | unsigned long count; | |
84 | loff_t offset; | |
85 | bool sync; | |
86 | ||
87 | void *rpcdata; | |
88 | int status; /* res */ | |
89 | int eof; /* res */ | |
90 | int committed; /* res */ | |
adb58535 BH |
91 | |
92 | /* Error reporting (layout_return) */ | |
93 | struct list_head err_list; | |
94 | unsigned num_comps; | |
95 | /* Pointer to array of error descriptors of size num_comps. | |
96 | * It should contain as many entries as devices in the osd_layout | |
97 | * that participate in the I/O. It is up to the io_engine to allocate | |
98 | * needed space and set num_comps. | |
99 | */ | |
100 | struct pnfs_osd_ioerr *ioerrs; | |
04f83450 BH |
101 | }; |
102 | ||
09f5bf4e BH |
103 | /* |
104 | * Raid engine I/O API | |
105 | */ | |
106 | extern int objio_alloc_lseg(struct pnfs_layout_segment **outp, | |
107 | struct pnfs_layout_hdr *pnfslay, | |
108 | struct pnfs_layout_range *range, | |
109 | struct xdr_stream *xdr, | |
110 | gfp_t gfp_flags); | |
111 | extern void objio_free_lseg(struct pnfs_layout_segment *lseg); | |
112 | ||
04f83450 BH |
113 | extern int objio_alloc_io_state( |
114 | struct pnfs_layout_segment *lseg, | |
115 | struct objlayout_io_state **outp, | |
116 | gfp_t gfp_flags); | |
117 | extern void objio_free_io_state(struct objlayout_io_state *state); | |
118 | ||
119 | extern ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state); | |
120 | extern ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, | |
121 | bool stable); | |
122 | ||
b6c05f16 BH |
123 | /* |
124 | * callback API | |
125 | */ | |
adb58535 BH |
126 | extern void objlayout_io_set_result(struct objlayout_io_state *state, |
127 | unsigned index, struct pnfs_osd_objid *pooid, | |
128 | int osd_error, u64 offset, u64 length, bool is_write); | |
129 | ||
a0fe8bf4 BH |
130 | static inline void |
131 | objlayout_add_delta_space_used(struct objlayout_io_state *state, s64 space_used) | |
132 | { | |
133 | struct objlayout *objlay = OBJLAYOUT(state->lseg->pls_layout); | |
134 | ||
135 | /* If one of the I/Os errored out and the delta_space_used was | |
136 | * invalid we render the complete report as invalid. Protocol mandate | |
137 | * the DSU be accurate or not reported. | |
138 | */ | |
139 | spin_lock(&objlay->lock); | |
140 | if (objlay->delta_space_valid != OBJ_DSU_INVALID) { | |
141 | objlay->delta_space_valid = OBJ_DSU_VALID; | |
142 | objlay->delta_space_used += space_used; | |
143 | } | |
144 | spin_unlock(&objlay->lock); | |
145 | } | |
146 | ||
04f83450 BH |
147 | extern void objlayout_read_done(struct objlayout_io_state *state, |
148 | ssize_t status, bool sync); | |
149 | extern void objlayout_write_done(struct objlayout_io_state *state, | |
150 | ssize_t status, bool sync); | |
151 | ||
b6c05f16 BH |
152 | extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay, |
153 | struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr, | |
154 | gfp_t gfp_flags); | |
155 | extern void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr); | |
156 | ||
09f5bf4e BH |
157 | /* |
158 | * exported generic objects function vectors | |
159 | */ | |
e51b841d BH |
160 | |
161 | extern struct pnfs_layout_hdr *objlayout_alloc_layout_hdr(struct inode *, gfp_t gfp_flags); | |
162 | extern void objlayout_free_layout_hdr(struct pnfs_layout_hdr *); | |
163 | ||
09f5bf4e BH |
164 | extern struct pnfs_layout_segment *objlayout_alloc_lseg( |
165 | struct pnfs_layout_hdr *, | |
166 | struct nfs4_layoutget_res *, | |
167 | gfp_t gfp_flags); | |
168 | extern void objlayout_free_lseg(struct pnfs_layout_segment *); | |
169 | ||
04f83450 BH |
170 | extern enum pnfs_try_status objlayout_read_pagelist( |
171 | struct nfs_read_data *); | |
172 | ||
173 | extern enum pnfs_try_status objlayout_write_pagelist( | |
174 | struct nfs_write_data *, | |
175 | int how); | |
176 | ||
a0fe8bf4 BH |
177 | extern void objlayout_encode_layoutcommit( |
178 | struct pnfs_layout_hdr *, | |
179 | struct xdr_stream *, | |
180 | const struct nfs4_layoutcommit_args *); | |
181 | ||
adb58535 BH |
182 | extern void objlayout_encode_layoutreturn( |
183 | struct pnfs_layout_hdr *, | |
184 | struct xdr_stream *, | |
185 | const struct nfs4_layoutreturn_args *); | |
186 | ||
09f5bf4e | 187 | #endif /* _OBJLAYOUT_H */ |