2 * Copyright (c) 2004-2005 Silicon Graphics, Inc.
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
7 * published by the Free Software Foundation.
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.
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
19 #include "xfs_types.h"
22 #include "xfs_trans.h"
26 #include "xfs_dmapi.h"
27 #include "xfs_mount.h"
28 #include "xfs_export.h"
29 #include "xfs_vnodeops.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_inode.h"
32 #include "xfs_inode_item.h"
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.
39 static int xfs_fileid_length(int fileid_type)
41 switch (fileid_type) {
42 case FILEID_INO32_GEN:
44 case FILEID_INO32_GEN_PARENT:
46 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
48 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
51 return 255; /* invalid */
56 struct dentry *dentry,
61 struct fid *fid = (struct fid *)fh;
62 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
63 struct inode *inode = dentry->d_inode;
67 /* Directories don't need their parent encoded, they have ".." */
68 if (S_ISDIR(inode->i_mode) || !connectable)
69 fileid_type = FILEID_INO32_GEN;
71 fileid_type = FILEID_INO32_GEN_PARENT;
73 /* filesystem may contain 64bit inode numbers */
74 if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS))
75 fileid_type |= XFS_FILEID_TYPE_64FLAG;
78 * Only encode if there is enough space given. In practice
79 * this means we can't export a filesystem with 64bit inodes
80 * over NFSv2 with the subtree_check export option; the other
81 * seven combinations work. The real answer is "don't use v2".
83 len = xfs_fileid_length(fileid_type);
88 switch (fileid_type) {
89 case FILEID_INO32_GEN_PARENT:
90 spin_lock(&dentry->d_lock);
91 fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino;
92 fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
93 spin_unlock(&dentry->d_lock);
95 case FILEID_INO32_GEN:
96 fid->i32.ino = inode->i_ino;
97 fid->i32.gen = inode->i_generation;
99 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
100 spin_lock(&dentry->d_lock);
101 fid64->parent_ino = dentry->d_parent->d_inode->i_ino;
102 fid64->parent_gen = dentry->d_parent->d_inode->i_generation;
103 spin_unlock(&dentry->d_lock);
105 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
106 fid64->ino = inode->i_ino;
107 fid64->gen = inode->i_generation;
114 STATIC struct inode *
116 struct super_block *sb,
120 xfs_mount_t *mp = XFS_M(sb);
125 * NFS can sometimes send requests for ino 0. Fail them gracefully.
128 return ERR_PTR(-ESTALE);
131 * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
132 * fine and not an indication of a corrupted filesystem as clients can
133 * send invalid file handles and we have to handle it gracefully..
135 error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED,
136 XFS_ILOCK_SHARED, &ip);
139 * EINVAL means the inode cluster doesn't exist anymore.
140 * This implies the filehandle is stale, so we should
142 * We don't use ESTALE directly down the chain to not
143 * confuse applications using bulkstat that expect EINVAL.
147 return ERR_PTR(-error);
150 if (ip->i_d.di_gen != generation) {
151 xfs_iput_new(ip, XFS_ILOCK_SHARED);
152 return ERR_PTR(-ENOENT);
155 xfs_iunlock(ip, XFS_ILOCK_SHARED);
159 STATIC struct dentry *
160 xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
161 int fh_len, int fileid_type)
163 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
164 struct inode *inode = NULL;
166 if (fh_len < xfs_fileid_length(fileid_type))
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);
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);
180 return d_obtain_alias(inode);
183 STATIC struct dentry *
184 xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
185 int fh_len, int fileid_type)
187 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
188 struct inode *inode = NULL;
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);
195 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
196 inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
201 return d_obtain_alias(inode);
204 STATIC struct dentry *
206 struct dentry *child)
209 struct xfs_inode *cip;
211 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
213 return ERR_PTR(-error);
215 return d_obtain_alias(VFS_I(cip));
219 xfs_fs_nfs_commit_metadata(
222 struct xfs_inode *ip = XFS_I(inode);
223 struct xfs_mount *mp = ip->i_mount;
226 xfs_ilock(ip, XFS_ILOCK_SHARED);
227 if (xfs_ipincount(ip)) {
228 error = _xfs_log_force_lsn(mp, ip->i_itemp->ili_last_lsn,
231 xfs_iunlock(ip, XFS_ILOCK_SHARED);
236 const struct export_operations xfs_export_operations = {
237 .encode_fh = xfs_fs_encode_fh,
238 .fh_to_dentry = xfs_fs_fh_to_dentry,
239 .fh_to_parent = xfs_fs_fh_to_parent,
240 .get_parent = xfs_fs_get_parent,
241 .commit_metadata = xfs_fs_nfs_commit_metadata,