Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2004-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 LT |
18 | #include "xfs.h" |
19 | #include "xfs_types.h" | |
da353b0d | 20 | #include "xfs_inum.h" |
1da177e4 LT |
21 | #include "xfs_log.h" |
22 | #include "xfs_trans.h" | |
23 | #include "xfs_sb.h" | |
da353b0d | 24 | #include "xfs_ag.h" |
556b8b16 | 25 | #include "xfs_dir2.h" |
da353b0d | 26 | #include "xfs_dmapi.h" |
1da177e4 LT |
27 | #include "xfs_mount.h" |
28 | #include "xfs_export.h" | |
739bfb2a CH |
29 | #include "xfs_vnodeops.h" |
30 | #include "xfs_bmap_btree.h" | |
31 | #include "xfs_inode.h" | |
1da177e4 LT |
32 | |
33 | /* | |
c38344fe CH |
34 | * Note that we only accept fileids which are long enough rather than allow |
35 | * the parent generation number to default to zero. XFS considers zero a | |
36 | * valid generation number not an invalid/wildcard value. | |
1da177e4 | 37 | */ |
c38344fe | 38 | static int xfs_fileid_length(int fileid_type) |
1da177e4 | 39 | { |
c38344fe CH |
40 | switch (fileid_type) { |
41 | case FILEID_INO32_GEN: | |
42 | return 2; | |
43 | case FILEID_INO32_GEN_PARENT: | |
44 | return 4; | |
45 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
46 | return 3; | |
47 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
48 | return 6; | |
1da177e4 | 49 | } |
c38344fe | 50 | return 255; /* invalid */ |
1da177e4 LT |
51 | } |
52 | ||
1da177e4 | 53 | STATIC int |
a50cd269 | 54 | xfs_fs_encode_fh( |
1da177e4 LT |
55 | struct dentry *dentry, |
56 | __u32 *fh, | |
57 | int *max_len, | |
58 | int connectable) | |
59 | { | |
c38344fe CH |
60 | struct fid *fid = (struct fid *)fh; |
61 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh; | |
1da177e4 | 62 | struct inode *inode = dentry->d_inode; |
c38344fe | 63 | int fileid_type; |
1da177e4 | 64 | int len; |
1da177e4 LT |
65 | |
66 | /* Directories don't need their parent encoded, they have ".." */ | |
24bd861d | 67 | if (S_ISDIR(inode->i_mode) || !connectable) |
c38344fe CH |
68 | fileid_type = FILEID_INO32_GEN; |
69 | else | |
70 | fileid_type = FILEID_INO32_GEN_PARENT; | |
71 | ||
72 | /* filesystem may contain 64bit inode numbers */ | |
73 | if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS)) | |
74 | fileid_type |= XFS_FILEID_TYPE_64FLAG; | |
1da177e4 LT |
75 | |
76 | /* | |
77 | * Only encode if there is enough space given. In practice | |
78 | * this means we can't export a filesystem with 64bit inodes | |
79 | * over NFSv2 with the subtree_check export option; the other | |
80 | * seven combinations work. The real answer is "don't use v2". | |
81 | */ | |
c38344fe | 82 | len = xfs_fileid_length(fileid_type); |
1da177e4 LT |
83 | if (*max_len < len) |
84 | return 255; | |
85 | *max_len = len; | |
86 | ||
c38344fe CH |
87 | switch (fileid_type) { |
88 | case FILEID_INO32_GEN_PARENT: | |
1da177e4 | 89 | spin_lock(&dentry->d_lock); |
c38344fe CH |
90 | fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino; |
91 | fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation; | |
1da177e4 | 92 | spin_unlock(&dentry->d_lock); |
c38344fe CH |
93 | /*FALLTHRU*/ |
94 | case FILEID_INO32_GEN: | |
95 | fid->i32.ino = inode->i_ino; | |
96 | fid->i32.gen = inode->i_generation; | |
97 | break; | |
98 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
99 | spin_lock(&dentry->d_lock); | |
100 | fid64->parent_ino = dentry->d_parent->d_inode->i_ino; | |
101 | fid64->parent_gen = dentry->d_parent->d_inode->i_generation; | |
102 | spin_unlock(&dentry->d_lock); | |
103 | /*FALLTHRU*/ | |
104 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
105 | fid64->ino = inode->i_ino; | |
106 | fid64->gen = inode->i_generation; | |
107 | break; | |
1da177e4 | 108 | } |
c38344fe CH |
109 | |
110 | return fileid_type; | |
1da177e4 LT |
111 | } |
112 | ||
c38344fe CH |
113 | STATIC struct inode * |
114 | xfs_nfs_get_inode( | |
1da177e4 | 115 | struct super_block *sb, |
c38344fe CH |
116 | u64 ino, |
117 | u32 generation) | |
118 | { | |
f71354bc CH |
119 | xfs_mount_t *mp = XFS_M(sb); |
120 | xfs_inode_t *ip; | |
1da177e4 LT |
121 | int error; |
122 | ||
f71354bc CH |
123 | /* |
124 | * NFS can sometimes send requests for ino 0. Fail them gracefully. | |
125 | */ | |
126 | if (ino == 0) | |
127 | return ERR_PTR(-ESTALE); | |
1da177e4 | 128 | |
c9a98553 CH |
129 | /* |
130 | * The XFS_IGET_BULKSTAT means that an invalid inode number is just | |
131 | * fine and not an indication of a corrupted filesystem. Because | |
132 | * clients can send any kind of invalid file handle, e.g. after | |
133 | * a restore on the server we have to deal with this case gracefully. | |
134 | */ | |
135 | error = xfs_iget(mp, NULL, ino, XFS_IGET_BULKSTAT, | |
136 | XFS_ILOCK_SHARED, &ip, 0); | |
137 | if (error) { | |
138 | /* | |
139 | * EINVAL means the inode cluster doesn't exist anymore. | |
140 | * This implies the filehandle is stale, so we should | |
141 | * translate it here. | |
142 | * We don't use ESTALE directly down the chain to not | |
143 | * confuse applications using bulkstat that expect EINVAL. | |
144 | */ | |
145 | if (error == EINVAL) | |
146 | error = ESTALE; | |
c38344fe | 147 | return ERR_PTR(-error); |
c9a98553 | 148 | } |
f71354bc | 149 | |
6a7f422d | 150 | if (ip->i_d.di_gen != generation) { |
f71354bc CH |
151 | xfs_iput_new(ip, XFS_ILOCK_SHARED); |
152 | return ERR_PTR(-ENOENT); | |
153 | } | |
c38344fe | 154 | |
f71354bc | 155 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
01651646 | 156 | return VFS_I(ip); |
c38344fe CH |
157 | } |
158 | ||
159 | STATIC struct dentry * | |
160 | xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
161 | int fh_len, int fileid_type) | |
162 | { | |
163 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
164 | struct inode *inode = NULL; | |
c38344fe CH |
165 | |
166 | if (fh_len < xfs_fileid_length(fileid_type)) | |
167 | return NULL; | |
168 | ||
169 | switch (fileid_type) { | |
170 | case FILEID_INO32_GEN_PARENT: | |
171 | case FILEID_INO32_GEN: | |
172 | inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen); | |
173 | break; | |
174 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
175 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
176 | inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen); | |
177 | break; | |
178 | } | |
179 | ||
44003728 | 180 | return d_obtain_alias(inode); |
c38344fe CH |
181 | } |
182 | ||
183 | STATIC struct dentry * | |
184 | xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
185 | int fh_len, int fileid_type) | |
186 | { | |
187 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
188 | struct inode *inode = NULL; | |
c38344fe CH |
189 | |
190 | switch (fileid_type) { | |
191 | case FILEID_INO32_GEN_PARENT: | |
192 | inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino, | |
193 | fid->i32.parent_gen); | |
194 | break; | |
195 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
196 | inode = xfs_nfs_get_inode(sb, fid64->parent_ino, | |
197 | fid64->parent_gen); | |
198 | break; | |
199 | } | |
200 | ||
44003728 | 201 | return d_obtain_alias(inode); |
1da177e4 LT |
202 | } |
203 | ||
204 | STATIC struct dentry * | |
a50cd269 | 205 | xfs_fs_get_parent( |
1da177e4 LT |
206 | struct dentry *child) |
207 | { | |
208 | int error; | |
ef1f5e7a | 209 | struct xfs_inode *cip; |
1da177e4 | 210 | |
384f3ced | 211 | error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL); |
1da177e4 LT |
212 | if (unlikely(error)) |
213 | return ERR_PTR(-error); | |
214 | ||
44003728 | 215 | return d_obtain_alias(VFS_I(cip)); |
1da177e4 LT |
216 | } |
217 | ||
39655164 | 218 | const struct export_operations xfs_export_operations = { |
a50cd269 | 219 | .encode_fh = xfs_fs_encode_fh, |
c38344fe CH |
220 | .fh_to_dentry = xfs_fs_fh_to_dentry, |
221 | .fh_to_parent = xfs_fs_fh_to_parent, | |
a50cd269 | 222 | .get_parent = xfs_fs_get_parent, |
1da177e4 | 223 | }; |