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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 "alloc.h" |
35 | #include "dir.h" |
36 | #include "dlmglue.h" |
37 | #include "dcache.h" |
38 | #include "export.h" |
39 | #include "inode.h" |
40 | |
41 | #include "buffer_head_io.h" |
42 | #include "suballoc.h" |
43 | |
44 | struct ocfs2_inode_handle |
45 | { |
46 | u64 ih_blkno; |
47 | u32 ih_generation; |
48 | }; |
49 | |
50 | static struct dentry *ocfs2_get_dentry(struct super_block *sb, |
51 | struct ocfs2_inode_handle *handle) |
52 | { |
53 | struct inode *inode; |
54 | struct ocfs2_super *osb = OCFS2_SB(sb); |
55 | u64 blkno = handle->ih_blkno; |
56 | int status, set; |
57 | struct dentry *result; |
58 | |
59 | mlog_entry("(0x%p, 0x%p)\n", sb, handle); |
60 | |
61 | if (blkno == 0) { |
62 | mlog(0, "nfs wants inode with blkno: 0\n"); |
63 | result = ERR_PTR(-ESTALE); |
64 | goto bail; |
65 | } |
66 | |
67 | inode = ocfs2_ilookup(sb, blkno); |
68 | /* |
69 | * If the inode exists in memory, we only need to check it's |
70 | * generation number |
71 | */ |
72 | if (inode) |
73 | goto check_gen; |
74 | |
75 | /* |
76 | * This will synchronize us against ocfs2_delete_inode() on |
77 | * all nodes |
78 | */ |
79 | status = ocfs2_nfs_sync_lock(osb, 1); |
80 | if (status < 0) { |
81 | mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); |
82 | goto check_err; |
83 | } |
84 | |
85 | status = ocfs2_test_inode_bit(osb, blkno, &set); |
86 | if (status < 0) { |
87 | if (status == -EINVAL) { |
88 | /* |
89 | * The blkno NFS gave us doesn't even show up |
90 | * as an inode, we return -ESTALE to be |
91 | * nice |
92 | */ |
93 | mlog(0, "test inode bit failed %d\n", status); |
94 | status = -ESTALE; |
95 | } else { |
96 | mlog(ML_ERROR, "test inode bit failed %d\n", status); |
97 | } |
98 | goto unlock_nfs_sync; |
99 | } |
100 | |
101 | /* If the inode allocator bit is clear, this inode must be stale */ |
102 | if (!set) { |
103 | mlog(0, "inode %llu suballoc bit is clear\n", |
104 | (unsigned long long)blkno); |
105 | status = -ESTALE; |
106 | goto unlock_nfs_sync; |
107 | } |
108 | |
109 | inode = ocfs2_iget(osb, blkno, 0, 0); |
110 | |
111 | unlock_nfs_sync: |
112 | ocfs2_nfs_sync_unlock(osb, 1); |
113 | |
114 | check_err: |
115 | if (status < 0) { |
116 | if (status == -ESTALE) { |
117 | mlog(0, "stale inode ino: %llu generation: %u\n", |
118 | (unsigned long long)blkno, handle->ih_generation); |
119 | } |
120 | result = ERR_PTR(status); |
121 | goto bail; |
122 | } |
123 | |
124 | if (IS_ERR(inode)) { |
125 | mlog_errno(PTR_ERR(inode)); |
126 | result = (void *)inode; |
127 | goto bail; |
128 | } |
129 | |
130 | check_gen: |
131 | if (handle->ih_generation != inode->i_generation) { |
132 | iput(inode); |
133 | mlog(0, "stale inode ino: %llu generation: %u\n", |
134 | (unsigned long long)blkno, handle->ih_generation); |
135 | result = ERR_PTR(-ESTALE); |
136 | goto bail; |
137 | } |
138 | |
139 | result = d_obtain_alias(inode); |
140 | if (!IS_ERR(result)) |
141 | result->d_op = &ocfs2_dentry_ops; |
142 | else |
143 | mlog_errno(PTR_ERR(result)); |
144 | |
145 | bail: |
146 | mlog_exit_ptr(result); |
147 | return result; |
148 | } |
149 | |
150 | static struct dentry *ocfs2_get_parent(struct dentry *child) |
151 | { |
152 | int status; |
153 | u64 blkno; |
154 | struct dentry *parent; |
155 | struct inode *dir = child->d_inode; |
156 | |
157 | mlog_entry("(0x%p, '%.*s')\n", child, |
158 | child->d_name.len, child->d_name.name); |
159 | |
160 | mlog(0, "find parent of directory %llu\n", |
161 | (unsigned long long)OCFS2_I(dir)->ip_blkno); |
162 | |
163 | status = ocfs2_inode_lock(dir, NULL, 0); |
164 | if (status < 0) { |
165 | if (status != -ENOENT) |
166 | mlog_errno(status); |
167 | parent = ERR_PTR(status); |
168 | goto bail; |
169 | } |
170 | |
171 | status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
172 | if (status < 0) { |
173 | parent = ERR_PTR(-ENOENT); |
174 | goto bail_unlock; |
175 | } |
176 | |
177 | parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0)); |
178 | if (!IS_ERR(parent)) |
179 | parent->d_op = &ocfs2_dentry_ops; |
180 | |
181 | bail_unlock: |
182 | ocfs2_inode_unlock(dir, 0); |
183 | |
184 | bail: |
185 | mlog_exit_ptr(parent); |
186 | |
187 | return parent; |
188 | } |
189 | |
190 | static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len, |
191 | int connectable) |
192 | { |
193 | struct inode *inode = dentry->d_inode; |
194 | int len = *max_len; |
195 | int type = 1; |
196 | u64 blkno; |
197 | u32 generation; |
198 | __le32 *fh = (__force __le32 *) fh_in; |
199 | |
200 | mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry, |
201 | dentry->d_name.len, dentry->d_name.name, |
202 | fh, len, connectable); |
203 | |
204 | if (len < 3 || (connectable && len < 6)) { |
205 | mlog(ML_ERROR, "fh buffer is too small for encoding\n"); |
206 | type = 255; |
207 | goto bail; |
208 | } |
209 | |
210 | blkno = OCFS2_I(inode)->ip_blkno; |
211 | generation = inode->i_generation; |
212 | |
213 | mlog(0, "Encoding fh: blkno: %llu, generation: %u\n", |
214 | (unsigned long long)blkno, generation); |
215 | |
216 | len = 3; |
217 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); |
218 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); |
219 | fh[2] = cpu_to_le32(generation); |
220 | |
221 | if (connectable && !S_ISDIR(inode->i_mode)) { |
222 | struct inode *parent; |
223 | |
224 | spin_lock(&dentry->d_lock); |
225 | |
226 | parent = dentry->d_parent->d_inode; |
227 | blkno = OCFS2_I(parent)->ip_blkno; |
228 | generation = parent->i_generation; |
229 | |
230 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); |
231 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); |
232 | fh[5] = cpu_to_le32(generation); |
233 | |
234 | spin_unlock(&dentry->d_lock); |
235 | |
236 | len = 6; |
237 | type = 2; |
238 | |
239 | mlog(0, "Encoding parent: blkno: %llu, generation: %u\n", |
240 | (unsigned long long)blkno, generation); |
241 | } |
242 | |
243 | *max_len = len; |
244 | |
245 | bail: |
246 | mlog_exit(type); |
247 | return type; |
248 | } |
249 | |
250 | static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, |
251 | struct fid *fid, int fh_len, int fh_type) |
252 | { |
253 | struct ocfs2_inode_handle handle; |
254 | |
255 | if (fh_len < 3 || fh_type > 2) |
256 | return NULL; |
257 | |
258 | handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; |
259 | handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); |
260 | handle.ih_generation = le32_to_cpu(fid->raw[2]); |
261 | return ocfs2_get_dentry(sb, &handle); |
262 | } |
263 | |
264 | static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, |
265 | struct fid *fid, int fh_len, int fh_type) |
266 | { |
267 | struct ocfs2_inode_handle parent; |
268 | |
269 | if (fh_type != 2 || fh_len < 6) |
270 | return NULL; |
271 | |
272 | parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; |
273 | parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); |
274 | parent.ih_generation = le32_to_cpu(fid->raw[5]); |
275 | return ocfs2_get_dentry(sb, &parent); |
276 | } |
277 | |
278 | const struct export_operations ocfs2_export_ops = { |
279 | .encode_fh = ocfs2_encode_fh, |
280 | .fh_to_dentry = ocfs2_fh_to_dentry, |
281 | .fh_to_parent = ocfs2_fh_to_parent, |
282 | .get_parent = ocfs2_get_parent, |
283 | }; |
284 |
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