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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
7b718769 NS |
3 | * Copyright (c) 2004-2005 Silicon Graphics, Inc. |
4 | * All Rights Reserved. | |
1da177e4 | 5 | */ |
1da177e4 | 6 | #include "xfs.h" |
5467b34b | 7 | #include "xfs_shared.h" |
a4fbe6ab | 8 | #include "xfs_format.h" |
239880ef DC |
9 | #include "xfs_log_format.h" |
10 | #include "xfs_trans_resv.h" | |
1da177e4 | 11 | #include "xfs_mount.h" |
2b9ab5ab | 12 | #include "xfs_dir2.h" |
1da177e4 | 13 | #include "xfs_export.h" |
739bfb2a | 14 | #include "xfs_inode.h" |
239880ef | 15 | #include "xfs_trans.h" |
978ebd97 | 16 | #include "xfs_inode_item.h" |
33479e05 | 17 | #include "xfs_icache.h" |
52785112 | 18 | #include "xfs_pnfs.h" |
1da177e4 LT |
19 | |
20 | /* | |
c38344fe CH |
21 | * Note that we only accept fileids which are long enough rather than allow |
22 | * the parent generation number to default to zero. XFS considers zero a | |
23 | * valid generation number not an invalid/wildcard value. | |
1da177e4 | 24 | */ |
c38344fe | 25 | static int xfs_fileid_length(int fileid_type) |
1da177e4 | 26 | { |
c38344fe CH |
27 | switch (fileid_type) { |
28 | case FILEID_INO32_GEN: | |
29 | return 2; | |
30 | case FILEID_INO32_GEN_PARENT: | |
31 | return 4; | |
32 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
33 | return 3; | |
34 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
35 | return 6; | |
1da177e4 | 36 | } |
94e07a75 | 37 | return FILEID_INVALID; |
1da177e4 LT |
38 | } |
39 | ||
1da177e4 | 40 | STATIC int |
a50cd269 | 41 | xfs_fs_encode_fh( |
b0b0382b AV |
42 | struct inode *inode, |
43 | __u32 *fh, | |
44 | int *max_len, | |
45 | struct inode *parent) | |
1da177e4 | 46 | { |
2e973b2c | 47 | struct xfs_mount *mp = XFS_M(inode->i_sb); |
c38344fe CH |
48 | struct fid *fid = (struct fid *)fh; |
49 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh; | |
c38344fe | 50 | int fileid_type; |
1da177e4 | 51 | int len; |
1da177e4 LT |
52 | |
53 | /* Directories don't need their parent encoded, they have ".." */ | |
b0b0382b | 54 | if (!parent) |
c38344fe CH |
55 | fileid_type = FILEID_INO32_GEN; |
56 | else | |
57 | fileid_type = FILEID_INO32_GEN_PARENT; | |
58 | ||
576ecb8e | 59 | /* |
b63da6c8 | 60 | * If the filesystem may contain 64bit inode numbers, we need |
576ecb8e SK |
61 | * to use larger file handles that can represent them. |
62 | * | |
63 | * While we only allocate inodes that do not fit into 32 bits any | |
64 | * large enough filesystem may contain them, thus the slightly | |
65 | * confusing looking conditional below. | |
66 | */ | |
2e973b2c | 67 | if (!xfs_has_small_inums(mp) || xfs_is_inode32(mp)) |
c38344fe | 68 | fileid_type |= XFS_FILEID_TYPE_64FLAG; |
1da177e4 LT |
69 | |
70 | /* | |
71 | * Only encode if there is enough space given. In practice | |
72 | * this means we can't export a filesystem with 64bit inodes | |
73 | * over NFSv2 with the subtree_check export option; the other | |
74 | * seven combinations work. The real answer is "don't use v2". | |
75 | */ | |
c38344fe | 76 | len = xfs_fileid_length(fileid_type); |
5fe0c237 AK |
77 | if (*max_len < len) { |
78 | *max_len = len; | |
94e07a75 | 79 | return FILEID_INVALID; |
5fe0c237 | 80 | } |
1da177e4 LT |
81 | *max_len = len; |
82 | ||
c38344fe CH |
83 | switch (fileid_type) { |
84 | case FILEID_INO32_GEN_PARENT: | |
b0b0382b AV |
85 | fid->i32.parent_ino = XFS_I(parent)->i_ino; |
86 | fid->i32.parent_gen = parent->i_generation; | |
53004ee7 | 87 | fallthrough; |
c38344fe | 88 | case FILEID_INO32_GEN: |
c29f7d45 | 89 | fid->i32.ino = XFS_I(inode)->i_ino; |
c38344fe CH |
90 | fid->i32.gen = inode->i_generation; |
91 | break; | |
92 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
b0b0382b AV |
93 | fid64->parent_ino = XFS_I(parent)->i_ino; |
94 | fid64->parent_gen = parent->i_generation; | |
53004ee7 | 95 | fallthrough; |
c38344fe | 96 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: |
c29f7d45 | 97 | fid64->ino = XFS_I(inode)->i_ino; |
c38344fe CH |
98 | fid64->gen = inode->i_generation; |
99 | break; | |
1da177e4 | 100 | } |
c38344fe CH |
101 | |
102 | return fileid_type; | |
1da177e4 LT |
103 | } |
104 | ||
c38344fe CH |
105 | STATIC struct inode * |
106 | xfs_nfs_get_inode( | |
1da177e4 | 107 | struct super_block *sb, |
c38344fe CH |
108 | u64 ino, |
109 | u32 generation) | |
447a5647 | 110 | { |
f71354bc CH |
111 | xfs_mount_t *mp = XFS_M(sb); |
112 | xfs_inode_t *ip; | |
1da177e4 LT |
113 | int error; |
114 | ||
f71354bc CH |
115 | /* |
116 | * NFS can sometimes send requests for ino 0. Fail them gracefully. | |
117 | */ | |
118 | if (ino == 0) | |
119 | return ERR_PTR(-ESTALE); | |
1da177e4 | 120 | |
c9a98553 | 121 | /* |
1920779e DC |
122 | * The XFS_IGET_UNTRUSTED means that an invalid inode number is just |
123 | * fine and not an indication of a corrupted filesystem as clients can | |
124 | * send invalid file handles and we have to handle it gracefully.. | |
c9a98553 | 125 | */ |
ef35e925 | 126 | error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip); |
c9a98553 | 127 | if (error) { |
29cad0b3 | 128 | |
c9a98553 CH |
129 | /* |
130 | * EINVAL means the inode cluster doesn't exist anymore. | |
29cad0b3 DC |
131 | * EFSCORRUPTED means the metadata pointing to the inode cluster |
132 | * or the inode cluster itself is corrupt. This implies the | |
133 | * filehandle is stale, so we should translate it here. | |
c9a98553 CH |
134 | * We don't use ESTALE directly down the chain to not |
135 | * confuse applications using bulkstat that expect EINVAL. | |
136 | */ | |
29cad0b3 DC |
137 | switch (error) { |
138 | case -EINVAL: | |
139 | case -ENOENT: | |
140 | case -EFSCORRUPTED: | |
2451337d | 141 | error = -ESTALE; |
29cad0b3 DC |
142 | break; |
143 | default: | |
144 | break; | |
145 | } | |
2451337d | 146 | return ERR_PTR(error); |
c9a98553 | 147 | } |
f71354bc | 148 | |
9e9a2674 | 149 | if (VFS_I(ip)->i_generation != generation) { |
44a8736b | 150 | xfs_irele(ip); |
ad1a2c87 | 151 | return ERR_PTR(-ESTALE); |
f71354bc | 152 | } |
c38344fe | 153 | |
01651646 | 154 | return VFS_I(ip); |
c38344fe CH |
155 | } |
156 | ||
157 | STATIC struct dentry * | |
158 | xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
159 | int fh_len, int fileid_type) | |
160 | { | |
161 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
162 | struct inode *inode = NULL; | |
c38344fe CH |
163 | |
164 | if (fh_len < xfs_fileid_length(fileid_type)) | |
165 | return NULL; | |
166 | ||
167 | switch (fileid_type) { | |
168 | case FILEID_INO32_GEN_PARENT: | |
169 | case FILEID_INO32_GEN: | |
170 | inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen); | |
171 | break; | |
172 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
173 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
174 | inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen); | |
175 | break; | |
176 | } | |
177 | ||
44003728 | 178 | return d_obtain_alias(inode); |
c38344fe CH |
179 | } |
180 | ||
181 | STATIC struct dentry * | |
182 | xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
183 | int fh_len, int fileid_type) | |
184 | { | |
185 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
186 | struct inode *inode = NULL; | |
c38344fe | 187 | |
35c2a7f4 HD |
188 | if (fh_len < xfs_fileid_length(fileid_type)) |
189 | return NULL; | |
190 | ||
c38344fe CH |
191 | switch (fileid_type) { |
192 | case FILEID_INO32_GEN_PARENT: | |
193 | inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino, | |
194 | fid->i32.parent_gen); | |
195 | break; | |
196 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
197 | inode = xfs_nfs_get_inode(sb, fid64->parent_ino, | |
198 | fid64->parent_gen); | |
199 | break; | |
200 | } | |
201 | ||
44003728 | 202 | return d_obtain_alias(inode); |
1da177e4 LT |
203 | } |
204 | ||
205 | STATIC struct dentry * | |
a50cd269 | 206 | xfs_fs_get_parent( |
1da177e4 LT |
207 | struct dentry *child) |
208 | { | |
209 | int error; | |
ef1f5e7a | 210 | struct xfs_inode *cip; |
1da177e4 | 211 | |
2b0143b5 | 212 | error = xfs_lookup(XFS_I(d_inode(child)), &xfs_name_dotdot, &cip, NULL); |
1da177e4 | 213 | if (unlikely(error)) |
2451337d | 214 | return ERR_PTR(error); |
1da177e4 | 215 | |
44003728 | 216 | return d_obtain_alias(VFS_I(cip)); |
1da177e4 LT |
217 | } |
218 | ||
978ebd97 BM |
219 | STATIC int |
220 | xfs_fs_nfs_commit_metadata( | |
221 | struct inode *inode) | |
222 | { | |
54fbdd10 | 223 | return xfs_log_force_inode(XFS_I(inode)); |
978ebd97 BM |
224 | } |
225 | ||
39655164 | 226 | const struct export_operations xfs_export_operations = { |
a50cd269 | 227 | .encode_fh = xfs_fs_encode_fh, |
c38344fe CH |
228 | .fh_to_dentry = xfs_fs_fh_to_dentry, |
229 | .fh_to_parent = xfs_fs_fh_to_parent, | |
a50cd269 | 230 | .get_parent = xfs_fs_get_parent, |
978ebd97 | 231 | .commit_metadata = xfs_fs_nfs_commit_metadata, |
15d66ac2 | 232 | #ifdef CONFIG_EXPORTFS_BLOCK_OPS |
52785112 CH |
233 | .get_uuid = xfs_fs_get_uuid, |
234 | .map_blocks = xfs_fs_map_blocks, | |
235 | .commit_blocks = xfs_fs_commit_blocks, | |
236 | #endif | |
1da177e4 | 237 | }; |