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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 DC |
24 | #include "xfs_ag.h" |
25 | #include "xfs_dmapi.h" | |
1da177e4 LT |
26 | #include "xfs_mount.h" |
27 | #include "xfs_export.h" | |
739bfb2a CH |
28 | #include "xfs_vnodeops.h" |
29 | #include "xfs_bmap_btree.h" | |
30 | #include "xfs_inode.h" | |
745f6919 | 31 | #include "xfs_vfsops.h" |
1da177e4 | 32 | |
7989cb8e | 33 | static struct dentry dotdot = { .d_name.name = "..", .d_name.len = 2, }; |
9b94c2ed | 34 | |
1da177e4 | 35 | /* |
c38344fe CH |
36 | * Note that we only accept fileids which are long enough rather than allow |
37 | * the parent generation number to default to zero. XFS considers zero a | |
38 | * valid generation number not an invalid/wildcard value. | |
1da177e4 | 39 | */ |
c38344fe | 40 | static int xfs_fileid_length(int fileid_type) |
1da177e4 | 41 | { |
c38344fe CH |
42 | switch (fileid_type) { |
43 | case FILEID_INO32_GEN: | |
44 | return 2; | |
45 | case FILEID_INO32_GEN_PARENT: | |
46 | return 4; | |
47 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
48 | return 3; | |
49 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
50 | return 6; | |
1da177e4 | 51 | } |
c38344fe | 52 | return 255; /* invalid */ |
1da177e4 LT |
53 | } |
54 | ||
1da177e4 | 55 | STATIC int |
a50cd269 | 56 | xfs_fs_encode_fh( |
1da177e4 LT |
57 | struct dentry *dentry, |
58 | __u32 *fh, | |
59 | int *max_len, | |
60 | int connectable) | |
61 | { | |
c38344fe CH |
62 | struct fid *fid = (struct fid *)fh; |
63 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh; | |
1da177e4 | 64 | struct inode *inode = dentry->d_inode; |
c38344fe | 65 | int fileid_type; |
1da177e4 | 66 | int len; |
1da177e4 LT |
67 | |
68 | /* Directories don't need their parent encoded, they have ".." */ | |
24bd861d | 69 | if (S_ISDIR(inode->i_mode) || !connectable) |
c38344fe CH |
70 | fileid_type = FILEID_INO32_GEN; |
71 | else | |
72 | fileid_type = FILEID_INO32_GEN_PARENT; | |
73 | ||
74 | /* filesystem may contain 64bit inode numbers */ | |
75 | if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS)) | |
76 | fileid_type |= XFS_FILEID_TYPE_64FLAG; | |
1da177e4 LT |
77 | |
78 | /* | |
79 | * Only encode if there is enough space given. In practice | |
80 | * this means we can't export a filesystem with 64bit inodes | |
81 | * over NFSv2 with the subtree_check export option; the other | |
82 | * seven combinations work. The real answer is "don't use v2". | |
83 | */ | |
c38344fe | 84 | len = xfs_fileid_length(fileid_type); |
1da177e4 LT |
85 | if (*max_len < len) |
86 | return 255; | |
87 | *max_len = len; | |
88 | ||
c38344fe CH |
89 | switch (fileid_type) { |
90 | case FILEID_INO32_GEN_PARENT: | |
1da177e4 | 91 | spin_lock(&dentry->d_lock); |
c38344fe CH |
92 | fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino; |
93 | fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation; | |
1da177e4 | 94 | spin_unlock(&dentry->d_lock); |
c38344fe CH |
95 | /*FALLTHRU*/ |
96 | case FILEID_INO32_GEN: | |
97 | fid->i32.ino = inode->i_ino; | |
98 | fid->i32.gen = inode->i_generation; | |
99 | break; | |
100 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
101 | spin_lock(&dentry->d_lock); | |
102 | fid64->parent_ino = dentry->d_parent->d_inode->i_ino; | |
103 | fid64->parent_gen = dentry->d_parent->d_inode->i_generation; | |
104 | spin_unlock(&dentry->d_lock); | |
105 | /*FALLTHRU*/ | |
106 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
107 | fid64->ino = inode->i_ino; | |
108 | fid64->gen = inode->i_generation; | |
109 | break; | |
1da177e4 | 110 | } |
c38344fe CH |
111 | |
112 | return fileid_type; | |
1da177e4 LT |
113 | } |
114 | ||
c38344fe CH |
115 | STATIC struct inode * |
116 | xfs_nfs_get_inode( | |
1da177e4 | 117 | struct super_block *sb, |
c38344fe CH |
118 | u64 ino, |
119 | u32 generation) | |
120 | { | |
f71354bc CH |
121 | xfs_mount_t *mp = XFS_M(sb); |
122 | xfs_inode_t *ip; | |
1da177e4 LT |
123 | int error; |
124 | ||
f71354bc CH |
125 | /* |
126 | * NFS can sometimes send requests for ino 0. Fail them gracefully. | |
127 | */ | |
128 | if (ino == 0) | |
129 | return ERR_PTR(-ESTALE); | |
1da177e4 | 130 | |
f71354bc | 131 | error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0); |
c38344fe CH |
132 | if (error) |
133 | return ERR_PTR(-error); | |
f71354bc CH |
134 | if (!ip) |
135 | return ERR_PTR(-EIO); | |
136 | ||
137 | if (!ip->i_d.di_mode || ip->i_d.di_gen != generation) { | |
138 | xfs_iput_new(ip, XFS_ILOCK_SHARED); | |
139 | return ERR_PTR(-ENOENT); | |
140 | } | |
c38344fe | 141 | |
f71354bc CH |
142 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
143 | return ip->i_vnode; | |
c38344fe CH |
144 | } |
145 | ||
146 | STATIC struct dentry * | |
147 | xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
148 | int fh_len, int fileid_type) | |
149 | { | |
150 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
151 | struct inode *inode = NULL; | |
152 | struct dentry *result; | |
153 | ||
154 | if (fh_len < xfs_fileid_length(fileid_type)) | |
155 | return NULL; | |
156 | ||
157 | switch (fileid_type) { | |
158 | case FILEID_INO32_GEN_PARENT: | |
159 | case FILEID_INO32_GEN: | |
160 | inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen); | |
161 | break; | |
162 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
163 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
164 | inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen); | |
165 | break; | |
166 | } | |
167 | ||
168 | if (!inode) | |
169 | return NULL; | |
170 | if (IS_ERR(inode)) | |
171 | return ERR_PTR(PTR_ERR(inode)); | |
172 | result = d_alloc_anon(inode); | |
173 | if (!result) { | |
174 | iput(inode); | |
175 | return ERR_PTR(-ENOMEM); | |
176 | } | |
177 | return result; | |
178 | } | |
179 | ||
180 | STATIC struct dentry * | |
181 | xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
182 | int fh_len, int fileid_type) | |
183 | { | |
184 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
185 | struct inode *inode = NULL; | |
186 | struct dentry *result; | |
187 | ||
188 | switch (fileid_type) { | |
189 | case FILEID_INO32_GEN_PARENT: | |
190 | inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino, | |
191 | fid->i32.parent_gen); | |
192 | break; | |
193 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
194 | inode = xfs_nfs_get_inode(sb, fid64->parent_ino, | |
195 | fid64->parent_gen); | |
196 | break; | |
197 | } | |
198 | ||
199 | if (!inode) | |
200 | return NULL; | |
201 | if (IS_ERR(inode)) | |
202 | return ERR_PTR(PTR_ERR(inode)); | |
1da177e4 | 203 | result = d_alloc_anon(inode); |
c38344fe | 204 | if (!result) { |
1da177e4 LT |
205 | iput(inode); |
206 | return ERR_PTR(-ENOMEM); | |
207 | } | |
208 | return result; | |
209 | } | |
210 | ||
211 | STATIC struct dentry * | |
a50cd269 | 212 | xfs_fs_get_parent( |
1da177e4 LT |
213 | struct dentry *child) |
214 | { | |
215 | int error; | |
ef1f5e7a | 216 | struct xfs_inode *cip; |
1da177e4 | 217 | struct dentry *parent; |
1da177e4 | 218 | |
ef1f5e7a | 219 | error = xfs_lookup(XFS_I(child->d_inode), &dotdot, &cip); |
1da177e4 LT |
220 | if (unlikely(error)) |
221 | return ERR_PTR(-error); | |
222 | ||
ef1f5e7a | 223 | parent = d_alloc_anon(cip->i_vnode); |
1da177e4 | 224 | if (unlikely(!parent)) { |
ef1f5e7a | 225 | iput(cip->i_vnode); |
1da177e4 LT |
226 | return ERR_PTR(-ENOMEM); |
227 | } | |
228 | return parent; | |
229 | } | |
230 | ||
39655164 | 231 | const struct export_operations xfs_export_operations = { |
a50cd269 | 232 | .encode_fh = xfs_fs_encode_fh, |
c38344fe CH |
233 | .fh_to_dentry = xfs_fs_fh_to_dentry, |
234 | .fh_to_parent = xfs_fs_fh_to_parent, | |
a50cd269 | 235 | .get_parent = xfs_fs_get_parent, |
1da177e4 | 236 | }; |