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" |
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" | |
978ebd97 | 31 | #include "xfs_inode_item.h" |
ef35e925 | 32 | #include "xfs_trace.h" |
1da177e4 LT |
33 | |
34 | /* | |
c38344fe CH |
35 | * Note that we only accept fileids which are long enough rather than allow |
36 | * the parent generation number to default to zero. XFS considers zero a | |
37 | * valid generation number not an invalid/wildcard value. | |
1da177e4 | 38 | */ |
c38344fe | 39 | static int xfs_fileid_length(int fileid_type) |
1da177e4 | 40 | { |
c38344fe CH |
41 | switch (fileid_type) { |
42 | case FILEID_INO32_GEN: | |
43 | return 2; | |
44 | case FILEID_INO32_GEN_PARENT: | |
45 | return 4; | |
46 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
47 | return 3; | |
48 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
49 | return 6; | |
1da177e4 | 50 | } |
c38344fe | 51 | return 255; /* invalid */ |
1da177e4 LT |
52 | } |
53 | ||
1da177e4 | 54 | STATIC int |
a50cd269 | 55 | xfs_fs_encode_fh( |
1da177e4 LT |
56 | struct dentry *dentry, |
57 | __u32 *fh, | |
58 | int *max_len, | |
59 | int connectable) | |
60 | { | |
c38344fe CH |
61 | struct fid *fid = (struct fid *)fh; |
62 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh; | |
1da177e4 | 63 | struct inode *inode = dentry->d_inode; |
c38344fe | 64 | int fileid_type; |
1da177e4 | 65 | int len; |
1da177e4 LT |
66 | |
67 | /* Directories don't need their parent encoded, they have ".." */ | |
24bd861d | 68 | if (S_ISDIR(inode->i_mode) || !connectable) |
c38344fe CH |
69 | fileid_type = FILEID_INO32_GEN; |
70 | else | |
71 | fileid_type = FILEID_INO32_GEN_PARENT; | |
72 | ||
576ecb8e SK |
73 | /* |
74 | * If the the filesystem may contain 64bit inode numbers, we need | |
75 | * to use larger file handles that can represent them. | |
76 | * | |
77 | * While we only allocate inodes that do not fit into 32 bits any | |
78 | * large enough filesystem may contain them, thus the slightly | |
79 | * confusing looking conditional below. | |
80 | */ | |
81 | if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) || | |
82 | (XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES)) | |
c38344fe | 83 | fileid_type |= XFS_FILEID_TYPE_64FLAG; |
1da177e4 LT |
84 | |
85 | /* | |
86 | * Only encode if there is enough space given. In practice | |
87 | * this means we can't export a filesystem with 64bit inodes | |
88 | * over NFSv2 with the subtree_check export option; the other | |
89 | * seven combinations work. The real answer is "don't use v2". | |
90 | */ | |
c38344fe | 91 | len = xfs_fileid_length(fileid_type); |
5fe0c237 AK |
92 | if (*max_len < len) { |
93 | *max_len = len; | |
1da177e4 | 94 | return 255; |
5fe0c237 | 95 | } |
1da177e4 LT |
96 | *max_len = len; |
97 | ||
c38344fe CH |
98 | switch (fileid_type) { |
99 | case FILEID_INO32_GEN_PARENT: | |
1da177e4 | 100 | spin_lock(&dentry->d_lock); |
c29f7d45 | 101 | fid->i32.parent_ino = XFS_I(dentry->d_parent->d_inode)->i_ino; |
c38344fe | 102 | fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation; |
1da177e4 | 103 | spin_unlock(&dentry->d_lock); |
c38344fe CH |
104 | /*FALLTHRU*/ |
105 | case FILEID_INO32_GEN: | |
c29f7d45 | 106 | fid->i32.ino = XFS_I(inode)->i_ino; |
c38344fe CH |
107 | fid->i32.gen = inode->i_generation; |
108 | break; | |
109 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
110 | spin_lock(&dentry->d_lock); | |
c29f7d45 | 111 | fid64->parent_ino = XFS_I(dentry->d_parent->d_inode)->i_ino; |
c38344fe CH |
112 | fid64->parent_gen = dentry->d_parent->d_inode->i_generation; |
113 | spin_unlock(&dentry->d_lock); | |
114 | /*FALLTHRU*/ | |
115 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
c29f7d45 | 116 | fid64->ino = XFS_I(inode)->i_ino; |
c38344fe CH |
117 | fid64->gen = inode->i_generation; |
118 | break; | |
1da177e4 | 119 | } |
c38344fe CH |
120 | |
121 | return fileid_type; | |
1da177e4 LT |
122 | } |
123 | ||
c38344fe CH |
124 | STATIC struct inode * |
125 | xfs_nfs_get_inode( | |
1da177e4 | 126 | struct super_block *sb, |
c38344fe CH |
127 | u64 ino, |
128 | u32 generation) | |
129 | { | |
f71354bc CH |
130 | xfs_mount_t *mp = XFS_M(sb); |
131 | xfs_inode_t *ip; | |
1da177e4 LT |
132 | int error; |
133 | ||
f71354bc CH |
134 | /* |
135 | * NFS can sometimes send requests for ino 0. Fail them gracefully. | |
136 | */ | |
137 | if (ino == 0) | |
138 | return ERR_PTR(-ESTALE); | |
1da177e4 | 139 | |
c9a98553 | 140 | /* |
1920779e DC |
141 | * The XFS_IGET_UNTRUSTED means that an invalid inode number is just |
142 | * fine and not an indication of a corrupted filesystem as clients can | |
143 | * send invalid file handles and we have to handle it gracefully.. | |
c9a98553 | 144 | */ |
ef35e925 | 145 | error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip); |
c9a98553 CH |
146 | if (error) { |
147 | /* | |
148 | * EINVAL means the inode cluster doesn't exist anymore. | |
149 | * This implies the filehandle is stale, so we should | |
150 | * translate it here. | |
151 | * We don't use ESTALE directly down the chain to not | |
152 | * confuse applications using bulkstat that expect EINVAL. | |
153 | */ | |
ad1a2c87 | 154 | if (error == EINVAL || error == ENOENT) |
c9a98553 | 155 | error = ESTALE; |
c38344fe | 156 | return ERR_PTR(-error); |
c9a98553 | 157 | } |
f71354bc | 158 | |
6a7f422d | 159 | if (ip->i_d.di_gen != generation) { |
ef35e925 | 160 | IRELE(ip); |
ad1a2c87 | 161 | return ERR_PTR(-ESTALE); |
f71354bc | 162 | } |
c38344fe | 163 | |
01651646 | 164 | return VFS_I(ip); |
c38344fe CH |
165 | } |
166 | ||
167 | STATIC struct dentry * | |
168 | xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
169 | int fh_len, int fileid_type) | |
170 | { | |
171 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
172 | struct inode *inode = NULL; | |
c38344fe CH |
173 | |
174 | if (fh_len < xfs_fileid_length(fileid_type)) | |
175 | return NULL; | |
176 | ||
177 | switch (fileid_type) { | |
178 | case FILEID_INO32_GEN_PARENT: | |
179 | case FILEID_INO32_GEN: | |
180 | inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen); | |
181 | break; | |
182 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
183 | case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG: | |
184 | inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen); | |
185 | break; | |
186 | } | |
187 | ||
44003728 | 188 | return d_obtain_alias(inode); |
c38344fe CH |
189 | } |
190 | ||
191 | STATIC struct dentry * | |
192 | xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
193 | int fh_len, int fileid_type) | |
194 | { | |
195 | struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid; | |
196 | struct inode *inode = NULL; | |
c38344fe CH |
197 | |
198 | switch (fileid_type) { | |
199 | case FILEID_INO32_GEN_PARENT: | |
200 | inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino, | |
201 | fid->i32.parent_gen); | |
202 | break; | |
203 | case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG: | |
204 | inode = xfs_nfs_get_inode(sb, fid64->parent_ino, | |
205 | fid64->parent_gen); | |
206 | break; | |
207 | } | |
208 | ||
44003728 | 209 | return d_obtain_alias(inode); |
1da177e4 LT |
210 | } |
211 | ||
212 | STATIC struct dentry * | |
a50cd269 | 213 | xfs_fs_get_parent( |
1da177e4 LT |
214 | struct dentry *child) |
215 | { | |
216 | int error; | |
ef1f5e7a | 217 | struct xfs_inode *cip; |
1da177e4 | 218 | |
384f3ced | 219 | error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL); |
1da177e4 LT |
220 | if (unlikely(error)) |
221 | return ERR_PTR(-error); | |
222 | ||
44003728 | 223 | return d_obtain_alias(VFS_I(cip)); |
1da177e4 LT |
224 | } |
225 | ||
978ebd97 BM |
226 | STATIC int |
227 | xfs_fs_nfs_commit_metadata( | |
228 | struct inode *inode) | |
229 | { | |
230 | struct xfs_inode *ip = XFS_I(inode); | |
231 | struct xfs_mount *mp = ip->i_mount; | |
8292d88c | 232 | xfs_lsn_t lsn = 0; |
978ebd97 BM |
233 | |
234 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
8292d88c CH |
235 | if (xfs_ipincount(ip)) |
236 | lsn = ip->i_itemp->ili_last_lsn; | |
978ebd97 BM |
237 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
238 | ||
8292d88c CH |
239 | if (!lsn) |
240 | return 0; | |
241 | return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL); | |
978ebd97 BM |
242 | } |
243 | ||
39655164 | 244 | const struct export_operations xfs_export_operations = { |
a50cd269 | 245 | .encode_fh = xfs_fs_encode_fh, |
c38344fe CH |
246 | .fh_to_dentry = xfs_fs_fh_to_dentry, |
247 | .fh_to_parent = xfs_fs_fh_to_parent, | |
a50cd269 | 248 | .get_parent = xfs_fs_get_parent, |
978ebd97 | 249 | .commit_metadata = xfs_fs_nfs_commit_metadata, |
1da177e4 | 250 | }; |