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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ccd979bd MF |
2 | /* -*- mode: c; c-basic-offset: 8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * export.c | |
6 | * | |
7 | * Functions to facilitate NFS exporting | |
8 | * | |
9 | * Copyright (C) 2002, 2005 Oracle. All rights reserved. | |
ccd979bd MF |
10 | */ |
11 | ||
12 | #include <linux/fs.h> | |
13 | #include <linux/types.h> | |
14 | ||
ccd979bd MF |
15 | #include <cluster/masklog.h> |
16 | ||
17 | #include "ocfs2.h" | |
18 | ||
6ca497a8 | 19 | #include "alloc.h" |
ccd979bd MF |
20 | #include "dir.h" |
21 | #include "dlmglue.h" | |
379dfe9d | 22 | #include "dcache.h" |
ccd979bd MF |
23 | #include "export.h" |
24 | #include "inode.h" | |
25 | ||
26 | #include "buffer_head_io.h" | |
6ca497a8 | 27 | #include "suballoc.h" |
781f200c | 28 | #include "ocfs2_trace.h" |
ccd979bd MF |
29 | |
30 | struct ocfs2_inode_handle | |
31 | { | |
32 | u64 ih_blkno; | |
33 | u32 ih_generation; | |
34 | }; | |
35 | ||
644f9ab3 CH |
36 | static struct dentry *ocfs2_get_dentry(struct super_block *sb, |
37 | struct ocfs2_inode_handle *handle) | |
ccd979bd | 38 | { |
ccd979bd | 39 | struct inode *inode; |
6ca497a8 | 40 | struct ocfs2_super *osb = OCFS2_SB(sb); |
41 | u64 blkno = handle->ih_blkno; | |
42 | int status, set; | |
ccd979bd MF |
43 | struct dentry *result; |
44 | ||
781f200c | 45 | trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno); |
ccd979bd | 46 | |
6ca497a8 | 47 | if (blkno == 0) { |
6ca497a8 | 48 | result = ERR_PTR(-ESTALE); |
49 | goto bail; | |
ccd979bd MF |
50 | } |
51 | ||
6ca497a8 | 52 | inode = ocfs2_ilookup(sb, blkno); |
53 | /* | |
54 | * If the inode exists in memory, we only need to check it's | |
55 | * generation number | |
56 | */ | |
57 | if (inode) | |
58 | goto check_gen; | |
ccd979bd | 59 | |
6ca497a8 | 60 | /* |
61 | * This will synchronize us against ocfs2_delete_inode() on | |
62 | * all nodes | |
63 | */ | |
64 | status = ocfs2_nfs_sync_lock(osb, 1); | |
65 | if (status < 0) { | |
66 | mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); | |
67 | goto check_err; | |
68 | } | |
69 | ||
70 | status = ocfs2_test_inode_bit(osb, blkno, &set); | |
71 | if (status < 0) { | |
72 | if (status == -EINVAL) { | |
73 | /* | |
74 | * The blkno NFS gave us doesn't even show up | |
75 | * as an inode, we return -ESTALE to be | |
76 | * nice | |
77 | */ | |
6ca497a8 | 78 | status = -ESTALE; |
781f200c | 79 | } else |
6ca497a8 | 80 | mlog(ML_ERROR, "test inode bit failed %d\n", status); |
6ca497a8 | 81 | goto unlock_nfs_sync; |
82 | } | |
83 | ||
023d4ea3 | 84 | trace_ocfs2_get_dentry_test_bit(status, set); |
6ca497a8 | 85 | /* If the inode allocator bit is clear, this inode must be stale */ |
86 | if (!set) { | |
6ca497a8 | 87 | status = -ESTALE; |
88 | goto unlock_nfs_sync; | |
89 | } | |
90 | ||
91 | inode = ocfs2_iget(osb, blkno, 0, 0); | |
92 | ||
93 | unlock_nfs_sync: | |
94 | ocfs2_nfs_sync_unlock(osb, 1); | |
95 | ||
96 | check_err: | |
97 | if (status < 0) { | |
98 | if (status == -ESTALE) { | |
781f200c TM |
99 | trace_ocfs2_get_dentry_stale((unsigned long long)blkno, |
100 | handle->ih_generation); | |
6ca497a8 | 101 | } |
102 | result = ERR_PTR(status); | |
103 | goto bail; | |
104 | } | |
105 | ||
106 | if (IS_ERR(inode)) { | |
107 | mlog_errno(PTR_ERR(inode)); | |
7585d12f | 108 | result = ERR_CAST(inode); |
6ca497a8 | 109 | goto bail; |
110 | } | |
ccd979bd | 111 | |
6ca497a8 | 112 | check_gen: |
ccd979bd | 113 | if (handle->ih_generation != inode->i_generation) { |
781f200c TM |
114 | trace_ocfs2_get_dentry_generation((unsigned long long)blkno, |
115 | handle->ih_generation, | |
116 | inode->i_generation); | |
164f7e58 | 117 | iput(inode); |
6ca497a8 | 118 | result = ERR_PTR(-ESTALE); |
119 | goto bail; | |
ccd979bd MF |
120 | } |
121 | ||
44003728 | 122 | result = d_obtain_alias(inode); |
ba87167c | 123 | if (IS_ERR(result)) |
6ca497a8 | 124 | mlog_errno(PTR_ERR(result)); |
ccd979bd | 125 | |
6ca497a8 | 126 | bail: |
781f200c | 127 | trace_ocfs2_get_dentry_end(result); |
ccd979bd MF |
128 | return result; |
129 | } | |
130 | ||
131 | static struct dentry *ocfs2_get_parent(struct dentry *child) | |
132 | { | |
133 | int status; | |
134 | u64 blkno; | |
135 | struct dentry *parent; | |
2b0143b5 | 136 | struct inode *dir = d_inode(child); |
e091eab0 | 137 | int set; |
ccd979bd | 138 | |
781f200c TM |
139 | trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name, |
140 | (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd | 141 | |
e091eab0 SZ |
142 | status = ocfs2_nfs_sync_lock(OCFS2_SB(dir->i_sb), 1); |
143 | if (status < 0) { | |
144 | mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); | |
145 | parent = ERR_PTR(status); | |
146 | goto bail; | |
147 | } | |
148 | ||
e63aecb6 | 149 | status = ocfs2_inode_lock(dir, NULL, 0); |
ccd979bd MF |
150 | if (status < 0) { |
151 | if (status != -ENOENT) | |
152 | mlog_errno(status); | |
153 | parent = ERR_PTR(status); | |
e091eab0 | 154 | goto unlock_nfs_sync; |
ccd979bd MF |
155 | } |
156 | ||
be94d117 | 157 | status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
ccd979bd MF |
158 | if (status < 0) { |
159 | parent = ERR_PTR(-ENOENT); | |
160 | goto bail_unlock; | |
161 | } | |
162 | ||
e091eab0 SZ |
163 | status = ocfs2_test_inode_bit(OCFS2_SB(dir->i_sb), blkno, &set); |
164 | if (status < 0) { | |
165 | if (status == -EINVAL) { | |
166 | status = -ESTALE; | |
167 | } else | |
168 | mlog(ML_ERROR, "test inode bit failed %d\n", status); | |
169 | parent = ERR_PTR(status); | |
170 | goto bail_unlock; | |
171 | } | |
172 | ||
173 | trace_ocfs2_get_dentry_test_bit(status, set); | |
174 | if (!set) { | |
175 | status = -ESTALE; | |
176 | parent = ERR_PTR(status); | |
177 | goto bail_unlock; | |
178 | } | |
179 | ||
44003728 | 180 | parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0)); |
379dfe9d | 181 | |
ccd979bd | 182 | bail_unlock: |
e63aecb6 | 183 | ocfs2_inode_unlock(dir, 0); |
ccd979bd | 184 | |
e091eab0 SZ |
185 | unlock_nfs_sync: |
186 | ocfs2_nfs_sync_unlock(OCFS2_SB(dir->i_sb), 1); | |
187 | ||
ccd979bd | 188 | bail: |
781f200c | 189 | trace_ocfs2_get_parent_end(parent); |
ccd979bd MF |
190 | |
191 | return parent; | |
192 | } | |
193 | ||
b0b0382b AV |
194 | static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len, |
195 | struct inode *parent) | |
ccd979bd | 196 | { |
ccd979bd MF |
197 | int len = *max_len; |
198 | int type = 1; | |
199 | u64 blkno; | |
200 | u32 generation; | |
1ca1a111 | 201 | __le32 *fh = (__force __le32 *) fh_in; |
ccd979bd | 202 | |
b0b0382b AV |
203 | #ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION |
204 | #error "You go ahead and fix that mess, then. Somehow" | |
781f200c TM |
205 | trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len, |
206 | dentry->d_name.name, | |
207 | fh, len, connectable); | |
b0b0382b | 208 | #endif |
ccd979bd | 209 | |
b0b0382b | 210 | if (parent && (len < 6)) { |
5fe0c237 | 211 | *max_len = 6; |
94e07a75 | 212 | type = FILEID_INVALID; |
5fe0c237 AK |
213 | goto bail; |
214 | } else if (len < 3) { | |
215 | *max_len = 3; | |
94e07a75 | 216 | type = FILEID_INVALID; |
ccd979bd MF |
217 | goto bail; |
218 | } | |
219 | ||
220 | blkno = OCFS2_I(inode)->ip_blkno; | |
221 | generation = inode->i_generation; | |
222 | ||
781f200c | 223 | trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation); |
ccd979bd MF |
224 | |
225 | len = 3; | |
226 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); | |
227 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
228 | fh[2] = cpu_to_le32(generation); | |
229 | ||
b0b0382b | 230 | if (parent) { |
ccd979bd MF |
231 | blkno = OCFS2_I(parent)->ip_blkno; |
232 | generation = parent->i_generation; | |
233 | ||
234 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); | |
235 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
236 | fh[5] = cpu_to_le32(generation); | |
237 | ||
ccd979bd MF |
238 | len = 6; |
239 | type = 2; | |
240 | ||
781f200c TM |
241 | trace_ocfs2_encode_fh_parent((unsigned long long)blkno, |
242 | generation); | |
ccd979bd | 243 | } |
2bd63216 | 244 | |
ccd979bd MF |
245 | *max_len = len; |
246 | ||
247 | bail: | |
781f200c | 248 | trace_ocfs2_encode_fh_type(type); |
ccd979bd MF |
249 | return type; |
250 | } | |
251 | ||
644f9ab3 CH |
252 | static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, |
253 | struct fid *fid, int fh_len, int fh_type) | |
ccd979bd | 254 | { |
644f9ab3 | 255 | struct ocfs2_inode_handle handle; |
ccd979bd | 256 | |
644f9ab3 CH |
257 | if (fh_len < 3 || fh_type > 2) |
258 | return NULL; | |
ccd979bd | 259 | |
644f9ab3 CH |
260 | handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; |
261 | handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); | |
262 | handle.ih_generation = le32_to_cpu(fid->raw[2]); | |
263 | return ocfs2_get_dentry(sb, &handle); | |
264 | } | |
ccd979bd | 265 | |
644f9ab3 CH |
266 | static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, |
267 | struct fid *fid, int fh_len, int fh_type) | |
268 | { | |
269 | struct ocfs2_inode_handle parent; | |
ccd979bd | 270 | |
644f9ab3 CH |
271 | if (fh_type != 2 || fh_len < 6) |
272 | return NULL; | |
ccd979bd | 273 | |
644f9ab3 CH |
274 | parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; |
275 | parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); | |
276 | parent.ih_generation = le32_to_cpu(fid->raw[5]); | |
277 | return ocfs2_get_dentry(sb, &parent); | |
ccd979bd MF |
278 | } |
279 | ||
39655164 | 280 | const struct export_operations ocfs2_export_ops = { |
ccd979bd | 281 | .encode_fh = ocfs2_encode_fh, |
644f9ab3 CH |
282 | .fh_to_dentry = ocfs2_fh_to_dentry, |
283 | .fh_to_parent = ocfs2_fh_to_parent, | |
ccd979bd | 284 | .get_parent = ocfs2_get_parent, |
ccd979bd | 285 | }; |