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1 | /* |
2 | * linux/fs/nfs/blocklayout/blocklayout.c | |
3 | * | |
4 | * Module for the NFSv4.1 pNFS block layout driver. | |
5 | * | |
6 | * Copyright (c) 2006 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Andy Adamson <andros@citi.umich.edu> | |
10 | * Fred Isaman <iisaman@umich.edu> | |
11 | * | |
12 | * permission is granted to use, copy, create derivative works and | |
13 | * redistribute this software and such derivative works for any purpose, | |
14 | * so long as the name of the university of michigan is not used in | |
15 | * any advertising or publicity pertaining to the use or distribution | |
16 | * of this software without specific, written prior authorization. if | |
17 | * the above copyright notice or any other identification of the | |
18 | * university of michigan is included in any copy of any portion of | |
19 | * this software, then the disclaimer below must also be included. | |
20 | * | |
21 | * this software is provided as is, without representation from the | |
22 | * university of michigan as to its fitness for any purpose, and without | |
23 | * warranty by the university of michigan of any kind, either express | |
24 | * or implied, including without limitation the implied warranties of | |
25 | * merchantability and fitness for a particular purpose. the regents | |
26 | * of the university of michigan shall not be liable for any damages, | |
27 | * including special, indirect, incidental, or consequential damages, | |
28 | * with respect to any claim arising out or in connection with the use | |
29 | * of the software, even if it has been or is hereafter advised of the | |
30 | * possibility of such damages. | |
31 | */ | |
32 | #include <linux/module.h> | |
33 | #include <linux/init.h> | |
34 | ||
35 | #include "blocklayout.h" | |
36 | ||
37 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
38 | ||
39 | MODULE_LICENSE("GPL"); | |
40 | MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>"); | |
41 | MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); | |
42 | ||
43 | static enum pnfs_try_status | |
44 | bl_read_pagelist(struct nfs_read_data *rdata) | |
45 | { | |
46 | return PNFS_NOT_ATTEMPTED; | |
47 | } | |
48 | ||
49 | static enum pnfs_try_status | |
50 | bl_write_pagelist(struct nfs_write_data *wdata, | |
51 | int sync) | |
52 | { | |
53 | return PNFS_NOT_ATTEMPTED; | |
54 | } | |
55 | ||
56 | /* STUB */ | |
57 | static void | |
58 | release_extents(struct pnfs_block_layout *bl, | |
59 | struct pnfs_layout_range *range) | |
60 | { | |
61 | return; | |
62 | } | |
63 | ||
64 | /* STUB */ | |
65 | static void | |
66 | release_inval_marks(struct pnfs_inval_markings *marks) | |
67 | { | |
68 | return; | |
69 | } | |
70 | ||
71 | static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
72 | { | |
73 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); | |
74 | ||
75 | dprintk("%s enter\n", __func__); | |
76 | release_extents(bl, NULL); | |
77 | release_inval_marks(&bl->bl_inval); | |
78 | kfree(bl); | |
79 | } | |
80 | ||
81 | static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, | |
82 | gfp_t gfp_flags) | |
83 | { | |
84 | struct pnfs_block_layout *bl; | |
85 | ||
86 | dprintk("%s enter\n", __func__); | |
87 | bl = kzalloc(sizeof(*bl), gfp_flags); | |
88 | if (!bl) | |
89 | return NULL; | |
90 | spin_lock_init(&bl->bl_ext_lock); | |
91 | INIT_LIST_HEAD(&bl->bl_extents[0]); | |
92 | INIT_LIST_HEAD(&bl->bl_extents[1]); | |
93 | INIT_LIST_HEAD(&bl->bl_commit); | |
94 | INIT_LIST_HEAD(&bl->bl_committing); | |
95 | bl->bl_count = 0; | |
96 | bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT; | |
97 | BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize); | |
98 | return &bl->bl_layout; | |
99 | } | |
100 | ||
101 | static void | |
102 | bl_free_lseg(struct pnfs_layout_segment *lseg) | |
103 | { | |
104 | } | |
105 | ||
106 | static struct pnfs_layout_segment * | |
107 | bl_alloc_lseg(struct pnfs_layout_hdr *lo, | |
108 | struct nfs4_layoutget_res *lgr, gfp_t gfp_flags) | |
109 | { | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | static void | |
114 | bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr, | |
115 | const struct nfs4_layoutcommit_args *arg) | |
116 | { | |
117 | } | |
118 | ||
119 | static void | |
120 | bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) | |
121 | { | |
122 | } | |
123 | ||
124 | static int | |
125 | bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) | |
126 | { | |
127 | dprintk("%s enter\n", __func__); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static int | |
132 | bl_clear_layoutdriver(struct nfs_server *server) | |
133 | { | |
134 | dprintk("%s enter\n", __func__); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static struct pnfs_layoutdriver_type blocklayout_type = { | |
139 | .id = LAYOUT_BLOCK_VOLUME, | |
140 | .name = "LAYOUT_BLOCK_VOLUME", | |
141 | .read_pagelist = bl_read_pagelist, | |
142 | .write_pagelist = bl_write_pagelist, | |
143 | .alloc_layout_hdr = bl_alloc_layout_hdr, | |
144 | .free_layout_hdr = bl_free_layout_hdr, | |
145 | .alloc_lseg = bl_alloc_lseg, | |
146 | .free_lseg = bl_free_lseg, | |
147 | .encode_layoutcommit = bl_encode_layoutcommit, | |
148 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, | |
149 | .set_layoutdriver = bl_set_layoutdriver, | |
150 | .clear_layoutdriver = bl_clear_layoutdriver, | |
151 | }; | |
152 | ||
153 | static int __init nfs4blocklayout_init(void) | |
154 | { | |
155 | int ret; | |
156 | ||
157 | dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); | |
158 | ||
159 | ret = pnfs_register_layoutdriver(&blocklayout_type); | |
160 | return ret; | |
161 | } | |
162 | ||
163 | static void __exit nfs4blocklayout_exit(void) | |
164 | { | |
165 | dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", | |
166 | __func__); | |
167 | ||
168 | pnfs_unregister_layoutdriver(&blocklayout_type); | |
169 | } | |
170 | ||
171 | MODULE_ALIAS("nfs-layouttype4-3"); | |
172 | ||
173 | module_init(nfs4blocklayout_init); | |
174 | module_exit(nfs4blocklayout_exit); |