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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 | ||
6ca497a8 | 34 | #include "alloc.h" |
ccd979bd MF |
35 | #include "dir.h" |
36 | #include "dlmglue.h" | |
379dfe9d | 37 | #include "dcache.h" |
ccd979bd MF |
38 | #include "export.h" |
39 | #include "inode.h" | |
40 | ||
41 | #include "buffer_head_io.h" | |
6ca497a8 | 42 | #include "suballoc.h" |
ccd979bd MF |
43 | |
44 | struct ocfs2_inode_handle | |
45 | { | |
46 | u64 ih_blkno; | |
47 | u32 ih_generation; | |
48 | }; | |
49 | ||
644f9ab3 CH |
50 | static struct dentry *ocfs2_get_dentry(struct super_block *sb, |
51 | struct ocfs2_inode_handle *handle) | |
ccd979bd | 52 | { |
ccd979bd | 53 | struct inode *inode; |
6ca497a8 | 54 | struct ocfs2_super *osb = OCFS2_SB(sb); |
55 | u64 blkno = handle->ih_blkno; | |
56 | int status, set; | |
ccd979bd MF |
57 | struct dentry *result; |
58 | ||
59 | mlog_entry("(0x%p, 0x%p)\n", sb, handle); | |
60 | ||
6ca497a8 | 61 | if (blkno == 0) { |
62 | mlog(0, "nfs wants inode with blkno: 0\n"); | |
63 | result = ERR_PTR(-ESTALE); | |
64 | goto bail; | |
ccd979bd MF |
65 | } |
66 | ||
6ca497a8 | 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; | |
ccd979bd | 74 | |
6ca497a8 | 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) { | |
5b09b507 JB |
103 | mlog(0, "inode %llu suballoc bit is clear\n", |
104 | (unsigned long long)blkno); | |
6ca497a8 | 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", | |
5b09b507 | 118 | (unsigned long long)blkno, handle->ih_generation); |
6ca497a8 | 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 | } | |
ccd979bd | 129 | |
6ca497a8 | 130 | check_gen: |
ccd979bd MF |
131 | if (handle->ih_generation != inode->i_generation) { |
132 | iput(inode); | |
5b09b507 JB |
133 | mlog(0, "stale inode ino: %llu generation: %u\n", |
134 | (unsigned long long)blkno, handle->ih_generation); | |
6ca497a8 | 135 | result = ERR_PTR(-ESTALE); |
136 | goto bail; | |
ccd979bd MF |
137 | } |
138 | ||
44003728 CH |
139 | result = d_obtain_alias(inode); |
140 | if (!IS_ERR(result)) | |
141 | result->d_op = &ocfs2_dentry_ops; | |
6ca497a8 | 142 | else |
143 | mlog_errno(PTR_ERR(result)); | |
ccd979bd | 144 | |
6ca497a8 | 145 | bail: |
ccd979bd MF |
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; | |
ccd979bd | 155 | struct inode *dir = child->d_inode; |
ccd979bd MF |
156 | |
157 | mlog_entry("(0x%p, '%.*s')\n", child, | |
158 | child->d_name.len, child->d_name.name); | |
159 | ||
b0697053 MF |
160 | mlog(0, "find parent of directory %llu\n", |
161 | (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd | 162 | |
e63aecb6 | 163 | status = ocfs2_inode_lock(dir, NULL, 0); |
ccd979bd MF |
164 | if (status < 0) { |
165 | if (status != -ENOENT) | |
166 | mlog_errno(status); | |
167 | parent = ERR_PTR(status); | |
168 | goto bail; | |
169 | } | |
170 | ||
be94d117 | 171 | status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
ccd979bd MF |
172 | if (status < 0) { |
173 | parent = ERR_PTR(-ENOENT); | |
174 | goto bail_unlock; | |
175 | } | |
176 | ||
44003728 CH |
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; | |
379dfe9d | 180 | |
ccd979bd | 181 | bail_unlock: |
e63aecb6 | 182 | ocfs2_inode_unlock(dir, 0); |
ccd979bd | 183 | |
ccd979bd MF |
184 | bail: |
185 | mlog_exit_ptr(parent); | |
186 | ||
187 | return parent; | |
188 | } | |
189 | ||
1ca1a111 | 190 | static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len, |
ccd979bd MF |
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; | |
1ca1a111 | 198 | __le32 *fh = (__force __le32 *) fh_in; |
ccd979bd MF |
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 | ||
b0697053 MF |
213 | mlog(0, "Encoding fh: blkno: %llu, generation: %u\n", |
214 | (unsigned long long)blkno, generation); | |
ccd979bd MF |
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 | ||
b0697053 MF |
239 | mlog(0, "Encoding parent: blkno: %llu, generation: %u\n", |
240 | (unsigned long long)blkno, generation); | |
ccd979bd MF |
241 | } |
242 | ||
243 | *max_len = len; | |
244 | ||
245 | bail: | |
246 | mlog_exit(type); | |
247 | return type; | |
248 | } | |
249 | ||
644f9ab3 CH |
250 | static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, |
251 | struct fid *fid, int fh_len, int fh_type) | |
ccd979bd | 252 | { |
644f9ab3 | 253 | struct ocfs2_inode_handle handle; |
ccd979bd | 254 | |
644f9ab3 CH |
255 | if (fh_len < 3 || fh_type > 2) |
256 | return NULL; | |
ccd979bd | 257 | |
644f9ab3 CH |
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 | } | |
ccd979bd | 263 | |
644f9ab3 CH |
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; | |
ccd979bd | 268 | |
644f9ab3 CH |
269 | if (fh_type != 2 || fh_len < 6) |
270 | return NULL; | |
ccd979bd | 271 | |
644f9ab3 CH |
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); | |
ccd979bd MF |
276 | } |
277 | ||
39655164 | 278 | const struct export_operations ocfs2_export_ops = { |
ccd979bd | 279 | .encode_fh = ocfs2_encode_fh, |
644f9ab3 CH |
280 | .fh_to_dentry = ocfs2_fh_to_dentry, |
281 | .fh_to_parent = ocfs2_fh_to_parent, | |
ccd979bd | 282 | .get_parent = ocfs2_get_parent, |
ccd979bd | 283 | }; |