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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * export.c | |
5 | * | |
6 | * Functions to facilitate NFS exporting | |
7 | * | |
8 | * Copyright (C) 2002, 2005 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/fs.h> | |
27 | #include <linux/types.h> | |
28 | ||
29 | #define MLOG_MASK_PREFIX ML_EXPORT | |
30 | #include <cluster/masklog.h> | |
31 | ||
32 | #include "ocfs2.h" | |
33 | ||
34 | #include "dir.h" | |
35 | #include "dlmglue.h" | |
36 | #include "export.h" | |
37 | #include "inode.h" | |
38 | ||
39 | #include "buffer_head_io.h" | |
40 | ||
41 | struct ocfs2_inode_handle | |
42 | { | |
43 | u64 ih_blkno; | |
44 | u32 ih_generation; | |
45 | }; | |
46 | ||
47 | static struct dentry *ocfs2_get_dentry(struct super_block *sb, void *vobjp) | |
48 | { | |
49 | struct ocfs2_inode_handle *handle = vobjp; | |
50 | struct inode *inode; | |
51 | struct dentry *result; | |
52 | ||
53 | mlog_entry("(0x%p, 0x%p)\n", sb, handle); | |
54 | ||
55 | if (handle->ih_blkno == 0) { | |
56 | mlog_errno(-ESTALE); | |
57 | return ERR_PTR(-ESTALE); | |
58 | } | |
59 | ||
60 | inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno); | |
61 | ||
62 | if (IS_ERR(inode)) { | |
63 | mlog_errno(PTR_ERR(inode)); | |
64 | return (void *)inode; | |
65 | } | |
66 | ||
67 | if (handle->ih_generation != inode->i_generation) { | |
68 | iput(inode); | |
69 | mlog_errno(-ESTALE); | |
70 | return ERR_PTR(-ESTALE); | |
71 | } | |
72 | ||
73 | result = d_alloc_anon(inode); | |
74 | ||
75 | if (!result) { | |
76 | iput(inode); | |
77 | mlog_errno(-ENOMEM); | |
78 | return ERR_PTR(-ENOMEM); | |
79 | } | |
80 | ||
81 | mlog_exit_ptr(result); | |
82 | return result; | |
83 | } | |
84 | ||
85 | static struct dentry *ocfs2_get_parent(struct dentry *child) | |
86 | { | |
87 | int status; | |
88 | u64 blkno; | |
89 | struct dentry *parent; | |
90 | struct inode *inode; | |
91 | struct inode *dir = child->d_inode; | |
92 | struct buffer_head *dirent_bh = NULL; | |
93 | struct ocfs2_dir_entry *dirent; | |
94 | ||
95 | mlog_entry("(0x%p, '%.*s')\n", child, | |
96 | child->d_name.len, child->d_name.name); | |
97 | ||
b0697053 MF |
98 | mlog(0, "find parent of directory %llu\n", |
99 | (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd MF |
100 | |
101 | status = ocfs2_meta_lock(dir, NULL, NULL, 0); | |
102 | if (status < 0) { | |
103 | if (status != -ENOENT) | |
104 | mlog_errno(status); | |
105 | parent = ERR_PTR(status); | |
106 | goto bail; | |
107 | } | |
108 | ||
109 | status = ocfs2_find_files_on_disk("..", 2, &blkno, dir, &dirent_bh, | |
110 | &dirent); | |
111 | if (status < 0) { | |
112 | parent = ERR_PTR(-ENOENT); | |
113 | goto bail_unlock; | |
114 | } | |
115 | ||
116 | inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno); | |
117 | if (IS_ERR(inode)) { | |
b0697053 MF |
118 | mlog(ML_ERROR, "Unable to create inode %llu\n", |
119 | (unsigned long long)blkno); | |
ccd979bd MF |
120 | parent = ERR_PTR(-EACCES); |
121 | goto bail_unlock; | |
122 | } | |
123 | ||
124 | parent = d_alloc_anon(inode); | |
125 | if (!parent) { | |
126 | iput(inode); | |
127 | parent = ERR_PTR(-ENOMEM); | |
128 | } | |
129 | ||
130 | bail_unlock: | |
131 | ocfs2_meta_unlock(dir, 0); | |
132 | ||
133 | if (dirent_bh) | |
134 | brelse(dirent_bh); | |
135 | ||
136 | bail: | |
137 | mlog_exit_ptr(parent); | |
138 | ||
139 | return parent; | |
140 | } | |
141 | ||
142 | static int ocfs2_encode_fh(struct dentry *dentry, __be32 *fh, int *max_len, | |
143 | int connectable) | |
144 | { | |
145 | struct inode *inode = dentry->d_inode; | |
146 | int len = *max_len; | |
147 | int type = 1; | |
148 | u64 blkno; | |
149 | u32 generation; | |
150 | ||
151 | mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry, | |
152 | dentry->d_name.len, dentry->d_name.name, | |
153 | fh, len, connectable); | |
154 | ||
155 | if (len < 3 || (connectable && len < 6)) { | |
156 | mlog(ML_ERROR, "fh buffer is too small for encoding\n"); | |
157 | type = 255; | |
158 | goto bail; | |
159 | } | |
160 | ||
161 | blkno = OCFS2_I(inode)->ip_blkno; | |
162 | generation = inode->i_generation; | |
163 | ||
b0697053 MF |
164 | mlog(0, "Encoding fh: blkno: %llu, generation: %u\n", |
165 | (unsigned long long)blkno, generation); | |
ccd979bd MF |
166 | |
167 | len = 3; | |
168 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); | |
169 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
170 | fh[2] = cpu_to_le32(generation); | |
171 | ||
172 | if (connectable && !S_ISDIR(inode->i_mode)) { | |
173 | struct inode *parent; | |
174 | ||
175 | spin_lock(&dentry->d_lock); | |
176 | ||
177 | parent = dentry->d_parent->d_inode; | |
178 | blkno = OCFS2_I(parent)->ip_blkno; | |
179 | generation = parent->i_generation; | |
180 | ||
181 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); | |
182 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
183 | fh[5] = cpu_to_le32(generation); | |
184 | ||
185 | spin_unlock(&dentry->d_lock); | |
186 | ||
187 | len = 6; | |
188 | type = 2; | |
189 | ||
b0697053 MF |
190 | mlog(0, "Encoding parent: blkno: %llu, generation: %u\n", |
191 | (unsigned long long)blkno, generation); | |
ccd979bd MF |
192 | } |
193 | ||
194 | *max_len = len; | |
195 | ||
196 | bail: | |
197 | mlog_exit(type); | |
198 | return type; | |
199 | } | |
200 | ||
201 | static struct dentry *ocfs2_decode_fh(struct super_block *sb, __be32 *fh, | |
202 | int fh_len, int fileid_type, | |
203 | int (*acceptable)(void *context, | |
204 | struct dentry *de), | |
205 | void *context) | |
206 | { | |
207 | struct ocfs2_inode_handle handle, parent; | |
208 | struct dentry *ret = NULL; | |
209 | ||
210 | mlog_entry("(0x%p, 0x%p, %d, %d, 0x%p, 0x%p)\n", | |
211 | sb, fh, fh_len, fileid_type, acceptable, context); | |
212 | ||
213 | if (fh_len < 3 || fileid_type > 2) | |
214 | goto bail; | |
215 | ||
216 | if (fileid_type == 2) { | |
217 | if (fh_len < 6) | |
218 | goto bail; | |
219 | ||
220 | parent.ih_blkno = (u64)le32_to_cpu(fh[3]) << 32; | |
221 | parent.ih_blkno |= (u64)le32_to_cpu(fh[4]); | |
222 | parent.ih_generation = le32_to_cpu(fh[5]); | |
223 | ||
b0697053 MF |
224 | mlog(0, "Decoding parent: blkno: %llu, generation: %u\n", |
225 | (unsigned long long)parent.ih_blkno, | |
226 | parent.ih_generation); | |
ccd979bd MF |
227 | } |
228 | ||
229 | handle.ih_blkno = (u64)le32_to_cpu(fh[0]) << 32; | |
230 | handle.ih_blkno |= (u64)le32_to_cpu(fh[1]); | |
231 | handle.ih_generation = le32_to_cpu(fh[2]); | |
232 | ||
b0697053 MF |
233 | mlog(0, "Encoding fh: blkno: %llu, generation: %u\n", |
234 | (unsigned long long)handle.ih_blkno, handle.ih_generation); | |
ccd979bd MF |
235 | |
236 | ret = ocfs2_export_ops.find_exported_dentry(sb, &handle, &parent, | |
237 | acceptable, context); | |
238 | ||
239 | bail: | |
240 | mlog_exit_ptr(ret); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | struct export_operations ocfs2_export_ops = { | |
245 | .decode_fh = ocfs2_decode_fh, | |
246 | .encode_fh = ocfs2_encode_fh, | |
247 | ||
248 | .get_parent = ocfs2_get_parent, | |
249 | .get_dentry = ocfs2_get_dentry, | |
250 | }; |