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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 | ||
98 | mlog(0, "find parent of directory %"MLFu64"\n", | |
99 | OCFS2_I(dir)->ip_blkno); | |
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)) { | |
118 | mlog(ML_ERROR, "Unable to create inode %"MLFu64"\n", blkno); | |
119 | parent = ERR_PTR(-EACCES); | |
120 | goto bail_unlock; | |
121 | } | |
122 | ||
123 | parent = d_alloc_anon(inode); | |
124 | if (!parent) { | |
125 | iput(inode); | |
126 | parent = ERR_PTR(-ENOMEM); | |
127 | } | |
128 | ||
129 | bail_unlock: | |
130 | ocfs2_meta_unlock(dir, 0); | |
131 | ||
132 | if (dirent_bh) | |
133 | brelse(dirent_bh); | |
134 | ||
135 | bail: | |
136 | mlog_exit_ptr(parent); | |
137 | ||
138 | return parent; | |
139 | } | |
140 | ||
141 | static int ocfs2_encode_fh(struct dentry *dentry, __be32 *fh, int *max_len, | |
142 | int connectable) | |
143 | { | |
144 | struct inode *inode = dentry->d_inode; | |
145 | int len = *max_len; | |
146 | int type = 1; | |
147 | u64 blkno; | |
148 | u32 generation; | |
149 | ||
150 | mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry, | |
151 | dentry->d_name.len, dentry->d_name.name, | |
152 | fh, len, connectable); | |
153 | ||
154 | if (len < 3 || (connectable && len < 6)) { | |
155 | mlog(ML_ERROR, "fh buffer is too small for encoding\n"); | |
156 | type = 255; | |
157 | goto bail; | |
158 | } | |
159 | ||
160 | blkno = OCFS2_I(inode)->ip_blkno; | |
161 | generation = inode->i_generation; | |
162 | ||
163 | mlog(0, "Encoding fh: blkno: %"MLFu64", generation: %u\n", | |
164 | blkno, generation); | |
165 | ||
166 | len = 3; | |
167 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); | |
168 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
169 | fh[2] = cpu_to_le32(generation); | |
170 | ||
171 | if (connectable && !S_ISDIR(inode->i_mode)) { | |
172 | struct inode *parent; | |
173 | ||
174 | spin_lock(&dentry->d_lock); | |
175 | ||
176 | parent = dentry->d_parent->d_inode; | |
177 | blkno = OCFS2_I(parent)->ip_blkno; | |
178 | generation = parent->i_generation; | |
179 | ||
180 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); | |
181 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
182 | fh[5] = cpu_to_le32(generation); | |
183 | ||
184 | spin_unlock(&dentry->d_lock); | |
185 | ||
186 | len = 6; | |
187 | type = 2; | |
188 | ||
189 | mlog(0, "Encoding parent: blkno: %"MLFu64", generation: %u\n", | |
190 | blkno, generation); | |
191 | } | |
192 | ||
193 | *max_len = len; | |
194 | ||
195 | bail: | |
196 | mlog_exit(type); | |
197 | return type; | |
198 | } | |
199 | ||
200 | static struct dentry *ocfs2_decode_fh(struct super_block *sb, __be32 *fh, | |
201 | int fh_len, int fileid_type, | |
202 | int (*acceptable)(void *context, | |
203 | struct dentry *de), | |
204 | void *context) | |
205 | { | |
206 | struct ocfs2_inode_handle handle, parent; | |
207 | struct dentry *ret = NULL; | |
208 | ||
209 | mlog_entry("(0x%p, 0x%p, %d, %d, 0x%p, 0x%p)\n", | |
210 | sb, fh, fh_len, fileid_type, acceptable, context); | |
211 | ||
212 | if (fh_len < 3 || fileid_type > 2) | |
213 | goto bail; | |
214 | ||
215 | if (fileid_type == 2) { | |
216 | if (fh_len < 6) | |
217 | goto bail; | |
218 | ||
219 | parent.ih_blkno = (u64)le32_to_cpu(fh[3]) << 32; | |
220 | parent.ih_blkno |= (u64)le32_to_cpu(fh[4]); | |
221 | parent.ih_generation = le32_to_cpu(fh[5]); | |
222 | ||
223 | mlog(0, "Decoding parent: blkno: %"MLFu64", generation: %u\n", | |
224 | parent.ih_blkno, parent.ih_generation); | |
225 | } | |
226 | ||
227 | handle.ih_blkno = (u64)le32_to_cpu(fh[0]) << 32; | |
228 | handle.ih_blkno |= (u64)le32_to_cpu(fh[1]); | |
229 | handle.ih_generation = le32_to_cpu(fh[2]); | |
230 | ||
231 | mlog(0, "Encoding fh: blkno: %"MLFu64", generation: %u\n", | |
232 | handle.ih_blkno, handle.ih_generation); | |
233 | ||
234 | ret = ocfs2_export_ops.find_exported_dentry(sb, &handle, &parent, | |
235 | acceptable, context); | |
236 | ||
237 | bail: | |
238 | mlog_exit_ptr(ret); | |
239 | return ret; | |
240 | } | |
241 | ||
242 | struct export_operations ocfs2_export_ops = { | |
243 | .decode_fh = ocfs2_decode_fh, | |
244 | .encode_fh = ocfs2_encode_fh, | |
245 | ||
246 | .get_parent = ocfs2_get_parent, | |
247 | .get_dentry = ocfs2_get_dentry, | |
248 | }; |