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ccd979bd MF |
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" | |
379dfe9d | 36 | #include "dcache.h" |
ccd979bd MF |
37 | #include "export.h" |
38 | #include "inode.h" | |
39 | ||
40 | #include "buffer_head_io.h" | |
41 | ||
42 | struct ocfs2_inode_handle | |
43 | { | |
44 | u64 ih_blkno; | |
45 | u32 ih_generation; | |
46 | }; | |
47 | ||
644f9ab3 CH |
48 | static struct dentry *ocfs2_get_dentry(struct super_block *sb, |
49 | struct ocfs2_inode_handle *handle) | |
ccd979bd | 50 | { |
ccd979bd MF |
51 | struct inode *inode; |
52 | struct dentry *result; | |
53 | ||
54 | mlog_entry("(0x%p, 0x%p)\n", sb, handle); | |
55 | ||
56 | if (handle->ih_blkno == 0) { | |
57 | mlog_errno(-ESTALE); | |
58 | return ERR_PTR(-ESTALE); | |
59 | } | |
60 | ||
5fa0613e | 61 | inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0); |
ccd979bd | 62 | |
6a1bd4a5 | 63 | if (IS_ERR(inode)) |
ccd979bd | 64 | return (void *)inode; |
ccd979bd MF |
65 | |
66 | if (handle->ih_generation != inode->i_generation) { | |
67 | iput(inode); | |
ccd979bd MF |
68 | return ERR_PTR(-ESTALE); |
69 | } | |
70 | ||
44003728 CH |
71 | result = d_obtain_alias(inode); |
72 | if (!IS_ERR(result)) | |
73 | result->d_op = &ocfs2_dentry_ops; | |
ccd979bd MF |
74 | |
75 | mlog_exit_ptr(result); | |
76 | return result; | |
77 | } | |
78 | ||
79 | static struct dentry *ocfs2_get_parent(struct dentry *child) | |
80 | { | |
81 | int status; | |
82 | u64 blkno; | |
83 | struct dentry *parent; | |
ccd979bd | 84 | struct inode *dir = child->d_inode; |
ccd979bd MF |
85 | |
86 | mlog_entry("(0x%p, '%.*s')\n", child, | |
87 | child->d_name.len, child->d_name.name); | |
88 | ||
b0697053 MF |
89 | mlog(0, "find parent of directory %llu\n", |
90 | (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd | 91 | |
e63aecb6 | 92 | status = ocfs2_inode_lock(dir, NULL, 0); |
ccd979bd MF |
93 | if (status < 0) { |
94 | if (status != -ENOENT) | |
95 | mlog_errno(status); | |
96 | parent = ERR_PTR(status); | |
97 | goto bail; | |
98 | } | |
99 | ||
be94d117 | 100 | status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
ccd979bd MF |
101 | if (status < 0) { |
102 | parent = ERR_PTR(-ENOENT); | |
103 | goto bail_unlock; | |
104 | } | |
105 | ||
44003728 CH |
106 | parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0)); |
107 | if (!IS_ERR(parent)) | |
108 | parent->d_op = &ocfs2_dentry_ops; | |
379dfe9d | 109 | |
ccd979bd | 110 | bail_unlock: |
e63aecb6 | 111 | ocfs2_inode_unlock(dir, 0); |
ccd979bd | 112 | |
ccd979bd MF |
113 | bail: |
114 | mlog_exit_ptr(parent); | |
115 | ||
116 | return parent; | |
117 | } | |
118 | ||
1ca1a111 | 119 | static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len, |
ccd979bd MF |
120 | int connectable) |
121 | { | |
122 | struct inode *inode = dentry->d_inode; | |
123 | int len = *max_len; | |
124 | int type = 1; | |
125 | u64 blkno; | |
126 | u32 generation; | |
1ca1a111 | 127 | __le32 *fh = (__force __le32 *) fh_in; |
ccd979bd MF |
128 | |
129 | mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry, | |
130 | dentry->d_name.len, dentry->d_name.name, | |
131 | fh, len, connectable); | |
132 | ||
133 | if (len < 3 || (connectable && len < 6)) { | |
134 | mlog(ML_ERROR, "fh buffer is too small for encoding\n"); | |
135 | type = 255; | |
136 | goto bail; | |
137 | } | |
138 | ||
139 | blkno = OCFS2_I(inode)->ip_blkno; | |
140 | generation = inode->i_generation; | |
141 | ||
b0697053 MF |
142 | mlog(0, "Encoding fh: blkno: %llu, generation: %u\n", |
143 | (unsigned long long)blkno, generation); | |
ccd979bd MF |
144 | |
145 | len = 3; | |
146 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); | |
147 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
148 | fh[2] = cpu_to_le32(generation); | |
149 | ||
150 | if (connectable && !S_ISDIR(inode->i_mode)) { | |
151 | struct inode *parent; | |
152 | ||
153 | spin_lock(&dentry->d_lock); | |
154 | ||
155 | parent = dentry->d_parent->d_inode; | |
156 | blkno = OCFS2_I(parent)->ip_blkno; | |
157 | generation = parent->i_generation; | |
158 | ||
159 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); | |
160 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
161 | fh[5] = cpu_to_le32(generation); | |
162 | ||
163 | spin_unlock(&dentry->d_lock); | |
164 | ||
165 | len = 6; | |
166 | type = 2; | |
167 | ||
b0697053 MF |
168 | mlog(0, "Encoding parent: blkno: %llu, generation: %u\n", |
169 | (unsigned long long)blkno, generation); | |
ccd979bd MF |
170 | } |
171 | ||
172 | *max_len = len; | |
173 | ||
174 | bail: | |
175 | mlog_exit(type); | |
176 | return type; | |
177 | } | |
178 | ||
644f9ab3 CH |
179 | static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, |
180 | struct fid *fid, int fh_len, int fh_type) | |
ccd979bd | 181 | { |
644f9ab3 | 182 | struct ocfs2_inode_handle handle; |
ccd979bd | 183 | |
644f9ab3 CH |
184 | if (fh_len < 3 || fh_type > 2) |
185 | return NULL; | |
ccd979bd | 186 | |
644f9ab3 CH |
187 | handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; |
188 | handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); | |
189 | handle.ih_generation = le32_to_cpu(fid->raw[2]); | |
190 | return ocfs2_get_dentry(sb, &handle); | |
191 | } | |
ccd979bd | 192 | |
644f9ab3 CH |
193 | static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, |
194 | struct fid *fid, int fh_len, int fh_type) | |
195 | { | |
196 | struct ocfs2_inode_handle parent; | |
ccd979bd | 197 | |
644f9ab3 CH |
198 | if (fh_type != 2 || fh_len < 6) |
199 | return NULL; | |
ccd979bd | 200 | |
644f9ab3 CH |
201 | parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; |
202 | parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); | |
203 | parent.ih_generation = le32_to_cpu(fid->raw[5]); | |
204 | return ocfs2_get_dentry(sb, &parent); | |
ccd979bd MF |
205 | } |
206 | ||
39655164 | 207 | const struct export_operations ocfs2_export_ops = { |
ccd979bd | 208 | .encode_fh = ocfs2_encode_fh, |
644f9ab3 CH |
209 | .fh_to_dentry = ocfs2_fh_to_dentry, |
210 | .fh_to_parent = ocfs2_fh_to_parent, | |
ccd979bd | 211 | .get_parent = ocfs2_get_parent, |
ccd979bd | 212 | }; |