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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 | ||
ccd979bd MF |
29 | #include <cluster/masklog.h> |
30 | ||
31 | #include "ocfs2.h" | |
32 | ||
6ca497a8 | 33 | #include "alloc.h" |
ccd979bd MF |
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" | |
6ca497a8 | 41 | #include "suballoc.h" |
781f200c | 42 | #include "ocfs2_trace.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 | ||
781f200c | 59 | trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno); |
ccd979bd | 60 | |
6ca497a8 | 61 | if (blkno == 0) { |
6ca497a8 | 62 | result = ERR_PTR(-ESTALE); |
63 | goto bail; | |
ccd979bd MF |
64 | } |
65 | ||
6ca497a8 | 66 | inode = ocfs2_ilookup(sb, blkno); |
67 | /* | |
68 | * If the inode exists in memory, we only need to check it's | |
69 | * generation number | |
70 | */ | |
71 | if (inode) | |
72 | goto check_gen; | |
ccd979bd | 73 | |
6ca497a8 | 74 | /* |
75 | * This will synchronize us against ocfs2_delete_inode() on | |
76 | * all nodes | |
77 | */ | |
78 | status = ocfs2_nfs_sync_lock(osb, 1); | |
79 | if (status < 0) { | |
80 | mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); | |
81 | goto check_err; | |
82 | } | |
83 | ||
84 | status = ocfs2_test_inode_bit(osb, blkno, &set); | |
85 | if (status < 0) { | |
86 | if (status == -EINVAL) { | |
87 | /* | |
88 | * The blkno NFS gave us doesn't even show up | |
89 | * as an inode, we return -ESTALE to be | |
90 | * nice | |
91 | */ | |
6ca497a8 | 92 | status = -ESTALE; |
781f200c | 93 | } else |
6ca497a8 | 94 | mlog(ML_ERROR, "test inode bit failed %d\n", status); |
6ca497a8 | 95 | goto unlock_nfs_sync; |
96 | } | |
97 | ||
023d4ea3 | 98 | trace_ocfs2_get_dentry_test_bit(status, set); |
6ca497a8 | 99 | /* If the inode allocator bit is clear, this inode must be stale */ |
100 | if (!set) { | |
6ca497a8 | 101 | status = -ESTALE; |
102 | goto unlock_nfs_sync; | |
103 | } | |
104 | ||
105 | inode = ocfs2_iget(osb, blkno, 0, 0); | |
106 | ||
107 | unlock_nfs_sync: | |
108 | ocfs2_nfs_sync_unlock(osb, 1); | |
109 | ||
110 | check_err: | |
111 | if (status < 0) { | |
112 | if (status == -ESTALE) { | |
781f200c TM |
113 | trace_ocfs2_get_dentry_stale((unsigned long long)blkno, |
114 | handle->ih_generation); | |
6ca497a8 | 115 | } |
116 | result = ERR_PTR(status); | |
117 | goto bail; | |
118 | } | |
119 | ||
120 | if (IS_ERR(inode)) { | |
121 | mlog_errno(PTR_ERR(inode)); | |
7585d12f | 122 | result = ERR_CAST(inode); |
6ca497a8 | 123 | goto bail; |
124 | } | |
ccd979bd | 125 | |
6ca497a8 | 126 | check_gen: |
ccd979bd | 127 | if (handle->ih_generation != inode->i_generation) { |
781f200c TM |
128 | trace_ocfs2_get_dentry_generation((unsigned long long)blkno, |
129 | handle->ih_generation, | |
130 | inode->i_generation); | |
164f7e58 | 131 | iput(inode); |
6ca497a8 | 132 | result = ERR_PTR(-ESTALE); |
133 | goto bail; | |
ccd979bd MF |
134 | } |
135 | ||
44003728 | 136 | result = d_obtain_alias(inode); |
ba87167c | 137 | if (IS_ERR(result)) |
6ca497a8 | 138 | mlog_errno(PTR_ERR(result)); |
ccd979bd | 139 | |
6ca497a8 | 140 | bail: |
781f200c | 141 | trace_ocfs2_get_dentry_end(result); |
ccd979bd MF |
142 | return result; |
143 | } | |
144 | ||
145 | static struct dentry *ocfs2_get_parent(struct dentry *child) | |
146 | { | |
147 | int status; | |
148 | u64 blkno; | |
149 | struct dentry *parent; | |
2b0143b5 | 150 | struct inode *dir = d_inode(child); |
ccd979bd | 151 | |
781f200c TM |
152 | trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name, |
153 | (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd | 154 | |
e63aecb6 | 155 | status = ocfs2_inode_lock(dir, NULL, 0); |
ccd979bd MF |
156 | if (status < 0) { |
157 | if (status != -ENOENT) | |
158 | mlog_errno(status); | |
159 | parent = ERR_PTR(status); | |
160 | goto bail; | |
161 | } | |
162 | ||
be94d117 | 163 | status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
ccd979bd MF |
164 | if (status < 0) { |
165 | parent = ERR_PTR(-ENOENT); | |
166 | goto bail_unlock; | |
167 | } | |
168 | ||
44003728 | 169 | parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0)); |
379dfe9d | 170 | |
ccd979bd | 171 | bail_unlock: |
e63aecb6 | 172 | ocfs2_inode_unlock(dir, 0); |
ccd979bd | 173 | |
ccd979bd | 174 | bail: |
781f200c | 175 | trace_ocfs2_get_parent_end(parent); |
ccd979bd MF |
176 | |
177 | return parent; | |
178 | } | |
179 | ||
b0b0382b AV |
180 | static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len, |
181 | struct inode *parent) | |
ccd979bd | 182 | { |
ccd979bd MF |
183 | int len = *max_len; |
184 | int type = 1; | |
185 | u64 blkno; | |
186 | u32 generation; | |
1ca1a111 | 187 | __le32 *fh = (__force __le32 *) fh_in; |
ccd979bd | 188 | |
b0b0382b AV |
189 | #ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION |
190 | #error "You go ahead and fix that mess, then. Somehow" | |
781f200c TM |
191 | trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len, |
192 | dentry->d_name.name, | |
193 | fh, len, connectable); | |
b0b0382b | 194 | #endif |
ccd979bd | 195 | |
b0b0382b | 196 | if (parent && (len < 6)) { |
5fe0c237 | 197 | *max_len = 6; |
94e07a75 | 198 | type = FILEID_INVALID; |
5fe0c237 AK |
199 | goto bail; |
200 | } else if (len < 3) { | |
201 | *max_len = 3; | |
94e07a75 | 202 | type = FILEID_INVALID; |
ccd979bd MF |
203 | goto bail; |
204 | } | |
205 | ||
206 | blkno = OCFS2_I(inode)->ip_blkno; | |
207 | generation = inode->i_generation; | |
208 | ||
781f200c | 209 | trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation); |
ccd979bd MF |
210 | |
211 | len = 3; | |
212 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); | |
213 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
214 | fh[2] = cpu_to_le32(generation); | |
215 | ||
b0b0382b | 216 | if (parent) { |
ccd979bd MF |
217 | blkno = OCFS2_I(parent)->ip_blkno; |
218 | generation = parent->i_generation; | |
219 | ||
220 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); | |
221 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
222 | fh[5] = cpu_to_le32(generation); | |
223 | ||
ccd979bd MF |
224 | len = 6; |
225 | type = 2; | |
226 | ||
781f200c TM |
227 | trace_ocfs2_encode_fh_parent((unsigned long long)blkno, |
228 | generation); | |
ccd979bd | 229 | } |
2bd63216 | 230 | |
ccd979bd MF |
231 | *max_len = len; |
232 | ||
233 | bail: | |
781f200c | 234 | trace_ocfs2_encode_fh_type(type); |
ccd979bd MF |
235 | return type; |
236 | } | |
237 | ||
644f9ab3 CH |
238 | static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, |
239 | struct fid *fid, int fh_len, int fh_type) | |
ccd979bd | 240 | { |
644f9ab3 | 241 | struct ocfs2_inode_handle handle; |
ccd979bd | 242 | |
644f9ab3 CH |
243 | if (fh_len < 3 || fh_type > 2) |
244 | return NULL; | |
ccd979bd | 245 | |
644f9ab3 CH |
246 | handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; |
247 | handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); | |
248 | handle.ih_generation = le32_to_cpu(fid->raw[2]); | |
249 | return ocfs2_get_dentry(sb, &handle); | |
250 | } | |
ccd979bd | 251 | |
644f9ab3 CH |
252 | static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, |
253 | struct fid *fid, int fh_len, int fh_type) | |
254 | { | |
255 | struct ocfs2_inode_handle parent; | |
ccd979bd | 256 | |
644f9ab3 CH |
257 | if (fh_type != 2 || fh_len < 6) |
258 | return NULL; | |
ccd979bd | 259 | |
644f9ab3 CH |
260 | parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; |
261 | parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); | |
262 | parent.ih_generation = le32_to_cpu(fid->raw[5]); | |
263 | return ocfs2_get_dentry(sb, &parent); | |
ccd979bd MF |
264 | } |
265 | ||
39655164 | 266 | const struct export_operations ocfs2_export_ops = { |
ccd979bd | 267 | .encode_fh = ocfs2_encode_fh, |
644f9ab3 CH |
268 | .fh_to_dentry = ocfs2_fh_to_dentry, |
269 | .fh_to_parent = ocfs2_fh_to_parent, | |
ccd979bd | 270 | .get_parent = ocfs2_get_parent, |
ccd979bd | 271 | }; |