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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fa60ce2c | 2 | /* |
ccd979bd MF |
3 | * export.c |
4 | * | |
5 | * Functions to facilitate NFS exporting | |
6 | * | |
7 | * Copyright (C) 2002, 2005 Oracle. All rights reserved. | |
ccd979bd MF |
8 | */ |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/types.h> | |
12 | ||
ccd979bd MF |
13 | #include <cluster/masklog.h> |
14 | ||
15 | #include "ocfs2.h" | |
16 | ||
6ca497a8 | 17 | #include "alloc.h" |
ccd979bd MF |
18 | #include "dir.h" |
19 | #include "dlmglue.h" | |
379dfe9d | 20 | #include "dcache.h" |
ccd979bd MF |
21 | #include "export.h" |
22 | #include "inode.h" | |
23 | ||
24 | #include "buffer_head_io.h" | |
6ca497a8 | 25 | #include "suballoc.h" |
781f200c | 26 | #include "ocfs2_trace.h" |
ccd979bd MF |
27 | |
28 | struct ocfs2_inode_handle | |
29 | { | |
30 | u64 ih_blkno; | |
31 | u32 ih_generation; | |
32 | }; | |
33 | ||
644f9ab3 CH |
34 | static struct dentry *ocfs2_get_dentry(struct super_block *sb, |
35 | struct ocfs2_inode_handle *handle) | |
ccd979bd | 36 | { |
ccd979bd | 37 | struct inode *inode; |
6ca497a8 | 38 | struct ocfs2_super *osb = OCFS2_SB(sb); |
39 | u64 blkno = handle->ih_blkno; | |
40 | int status, set; | |
ccd979bd MF |
41 | struct dentry *result; |
42 | ||
781f200c | 43 | trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno); |
ccd979bd | 44 | |
6ca497a8 | 45 | if (blkno == 0) { |
6ca497a8 | 46 | result = ERR_PTR(-ESTALE); |
47 | goto bail; | |
ccd979bd MF |
48 | } |
49 | ||
6ca497a8 | 50 | inode = ocfs2_ilookup(sb, blkno); |
51 | /* | |
52 | * If the inode exists in memory, we only need to check it's | |
53 | * generation number | |
54 | */ | |
55 | if (inode) | |
56 | goto check_gen; | |
ccd979bd | 57 | |
6ca497a8 | 58 | /* |
59 | * This will synchronize us against ocfs2_delete_inode() on | |
60 | * all nodes | |
61 | */ | |
62 | status = ocfs2_nfs_sync_lock(osb, 1); | |
63 | if (status < 0) { | |
64 | mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); | |
65 | goto check_err; | |
66 | } | |
67 | ||
68 | status = ocfs2_test_inode_bit(osb, blkno, &set); | |
69 | if (status < 0) { | |
70 | if (status == -EINVAL) { | |
71 | /* | |
72 | * The blkno NFS gave us doesn't even show up | |
73 | * as an inode, we return -ESTALE to be | |
74 | * nice | |
75 | */ | |
6ca497a8 | 76 | status = -ESTALE; |
781f200c | 77 | } else |
6ca497a8 | 78 | mlog(ML_ERROR, "test inode bit failed %d\n", status); |
6ca497a8 | 79 | goto unlock_nfs_sync; |
80 | } | |
81 | ||
023d4ea3 | 82 | trace_ocfs2_get_dentry_test_bit(status, set); |
6ca497a8 | 83 | /* If the inode allocator bit is clear, this inode must be stale */ |
84 | if (!set) { | |
6ca497a8 | 85 | status = -ESTALE; |
86 | goto unlock_nfs_sync; | |
87 | } | |
88 | ||
89 | inode = ocfs2_iget(osb, blkno, 0, 0); | |
90 | ||
91 | unlock_nfs_sync: | |
92 | ocfs2_nfs_sync_unlock(osb, 1); | |
93 | ||
94 | check_err: | |
95 | if (status < 0) { | |
96 | if (status == -ESTALE) { | |
781f200c TM |
97 | trace_ocfs2_get_dentry_stale((unsigned long long)blkno, |
98 | handle->ih_generation); | |
6ca497a8 | 99 | } |
100 | result = ERR_PTR(status); | |
101 | goto bail; | |
102 | } | |
103 | ||
104 | if (IS_ERR(inode)) { | |
105 | mlog_errno(PTR_ERR(inode)); | |
7585d12f | 106 | result = ERR_CAST(inode); |
6ca497a8 | 107 | goto bail; |
108 | } | |
ccd979bd | 109 | |
6ca497a8 | 110 | check_gen: |
ccd979bd | 111 | if (handle->ih_generation != inode->i_generation) { |
781f200c TM |
112 | trace_ocfs2_get_dentry_generation((unsigned long long)blkno, |
113 | handle->ih_generation, | |
114 | inode->i_generation); | |
164f7e58 | 115 | iput(inode); |
6ca497a8 | 116 | result = ERR_PTR(-ESTALE); |
117 | goto bail; | |
ccd979bd MF |
118 | } |
119 | ||
44003728 | 120 | result = d_obtain_alias(inode); |
ba87167c | 121 | if (IS_ERR(result)) |
6ca497a8 | 122 | mlog_errno(PTR_ERR(result)); |
ccd979bd | 123 | |
6ca497a8 | 124 | bail: |
781f200c | 125 | trace_ocfs2_get_dentry_end(result); |
ccd979bd MF |
126 | return result; |
127 | } | |
128 | ||
129 | static struct dentry *ocfs2_get_parent(struct dentry *child) | |
130 | { | |
131 | int status; | |
132 | u64 blkno; | |
133 | struct dentry *parent; | |
2b0143b5 | 134 | struct inode *dir = d_inode(child); |
e091eab0 | 135 | int set; |
ccd979bd | 136 | |
781f200c TM |
137 | trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name, |
138 | (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd | 139 | |
e091eab0 SZ |
140 | status = ocfs2_nfs_sync_lock(OCFS2_SB(dir->i_sb), 1); |
141 | if (status < 0) { | |
142 | mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); | |
143 | parent = ERR_PTR(status); | |
144 | goto bail; | |
145 | } | |
146 | ||
e63aecb6 | 147 | status = ocfs2_inode_lock(dir, NULL, 0); |
ccd979bd MF |
148 | if (status < 0) { |
149 | if (status != -ENOENT) | |
150 | mlog_errno(status); | |
151 | parent = ERR_PTR(status); | |
e091eab0 | 152 | goto unlock_nfs_sync; |
ccd979bd MF |
153 | } |
154 | ||
be94d117 | 155 | status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
ccd979bd MF |
156 | if (status < 0) { |
157 | parent = ERR_PTR(-ENOENT); | |
158 | goto bail_unlock; | |
159 | } | |
160 | ||
e091eab0 SZ |
161 | status = ocfs2_test_inode_bit(OCFS2_SB(dir->i_sb), blkno, &set); |
162 | if (status < 0) { | |
163 | if (status == -EINVAL) { | |
164 | status = -ESTALE; | |
165 | } else | |
166 | mlog(ML_ERROR, "test inode bit failed %d\n", status); | |
167 | parent = ERR_PTR(status); | |
168 | goto bail_unlock; | |
169 | } | |
170 | ||
171 | trace_ocfs2_get_dentry_test_bit(status, set); | |
172 | if (!set) { | |
173 | status = -ESTALE; | |
174 | parent = ERR_PTR(status); | |
175 | goto bail_unlock; | |
176 | } | |
177 | ||
44003728 | 178 | parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0)); |
379dfe9d | 179 | |
ccd979bd | 180 | bail_unlock: |
e63aecb6 | 181 | ocfs2_inode_unlock(dir, 0); |
ccd979bd | 182 | |
e091eab0 SZ |
183 | unlock_nfs_sync: |
184 | ocfs2_nfs_sync_unlock(OCFS2_SB(dir->i_sb), 1); | |
185 | ||
ccd979bd | 186 | bail: |
781f200c | 187 | trace_ocfs2_get_parent_end(parent); |
ccd979bd MF |
188 | |
189 | return parent; | |
190 | } | |
191 | ||
b0b0382b AV |
192 | static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len, |
193 | struct inode *parent) | |
ccd979bd | 194 | { |
ccd979bd MF |
195 | int len = *max_len; |
196 | int type = 1; | |
197 | u64 blkno; | |
198 | u32 generation; | |
1ca1a111 | 199 | __le32 *fh = (__force __le32 *) fh_in; |
ccd979bd | 200 | |
b0b0382b AV |
201 | #ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION |
202 | #error "You go ahead and fix that mess, then. Somehow" | |
781f200c TM |
203 | trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len, |
204 | dentry->d_name.name, | |
205 | fh, len, connectable); | |
b0b0382b | 206 | #endif |
ccd979bd | 207 | |
b0b0382b | 208 | if (parent && (len < 6)) { |
5fe0c237 | 209 | *max_len = 6; |
94e07a75 | 210 | type = FILEID_INVALID; |
5fe0c237 AK |
211 | goto bail; |
212 | } else if (len < 3) { | |
213 | *max_len = 3; | |
94e07a75 | 214 | type = FILEID_INVALID; |
ccd979bd MF |
215 | goto bail; |
216 | } | |
217 | ||
218 | blkno = OCFS2_I(inode)->ip_blkno; | |
219 | generation = inode->i_generation; | |
220 | ||
781f200c | 221 | trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation); |
ccd979bd MF |
222 | |
223 | len = 3; | |
224 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); | |
225 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
226 | fh[2] = cpu_to_le32(generation); | |
227 | ||
b0b0382b | 228 | if (parent) { |
ccd979bd MF |
229 | blkno = OCFS2_I(parent)->ip_blkno; |
230 | generation = parent->i_generation; | |
231 | ||
232 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); | |
233 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); | |
234 | fh[5] = cpu_to_le32(generation); | |
235 | ||
ccd979bd MF |
236 | len = 6; |
237 | type = 2; | |
238 | ||
781f200c TM |
239 | trace_ocfs2_encode_fh_parent((unsigned long long)blkno, |
240 | generation); | |
ccd979bd | 241 | } |
2bd63216 | 242 | |
ccd979bd MF |
243 | *max_len = len; |
244 | ||
245 | bail: | |
781f200c | 246 | trace_ocfs2_encode_fh_type(type); |
ccd979bd MF |
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 | }; |