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"
21 #include "xfs_trans.h"
25 #include "xfs_mount.h"
26 #include "xfs_export.h"
27 #include "xfs_vnodeops.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_inode_item.h"
31 #include "xfs_trace.h"
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.
38 static int xfs_fileid_length(int fileid_type)
40 switch (fileid_type) {
41 case FILEID_INO32_GEN:
43 case FILEID_INO32_GEN_PARENT:
45 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
47 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
50 return 255; /* invalid */
60 struct fid *fid = (struct fid *)fh;
61 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
65 /* Directories don't need their parent encoded, they have ".." */
67 fileid_type = FILEID_INO32_GEN;
69 fileid_type = FILEID_INO32_GEN_PARENT;
72 * If the the filesystem may contain 64bit inode numbers, we need
73 * to use larger file handles that can represent them.
75 * While we only allocate inodes that do not fit into 32 bits any
76 * large enough filesystem may contain them, thus the slightly
77 * confusing looking conditional below.
79 if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
80 (XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
81 fileid_type |= XFS_FILEID_TYPE_64FLAG;
84 * Only encode if there is enough space given. In practice
85 * this means we can't export a filesystem with 64bit inodes
86 * over NFSv2 with the subtree_check export option; the other
87 * seven combinations work. The real answer is "don't use v2".
89 len = xfs_fileid_length(fileid_type);
96 switch (fileid_type) {
97 case FILEID_INO32_GEN_PARENT:
98 fid->i32.parent_ino = XFS_I(parent)->i_ino;
99 fid->i32.parent_gen = parent->i_generation;
101 case FILEID_INO32_GEN:
102 fid->i32.ino = XFS_I(inode)->i_ino;
103 fid->i32.gen = inode->i_generation;
105 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
106 fid64->parent_ino = XFS_I(parent)->i_ino;
107 fid64->parent_gen = parent->i_generation;
109 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
110 fid64->ino = XFS_I(inode)->i_ino;
111 fid64->gen = inode->i_generation;
118 STATIC struct inode *
120 struct super_block *sb,
124 xfs_mount_t *mp = XFS_M(sb);
129 * NFS can sometimes send requests for ino 0. Fail them gracefully.
132 return ERR_PTR(-ESTALE);
135 * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
136 * fine and not an indication of a corrupted filesystem as clients can
137 * send invalid file handles and we have to handle it gracefully..
139 error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
142 * EINVAL means the inode cluster doesn't exist anymore.
143 * This implies the filehandle is stale, so we should
145 * We don't use ESTALE directly down the chain to not
146 * confuse applications using bulkstat that expect EINVAL.
148 if (error == EINVAL || error == ENOENT)
150 return ERR_PTR(-error);
153 if (ip->i_d.di_gen != generation) {
155 return ERR_PTR(-ESTALE);
161 STATIC struct dentry *
162 xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
163 int fh_len, int fileid_type)
165 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
166 struct inode *inode = NULL;
168 if (fh_len < xfs_fileid_length(fileid_type))
171 switch (fileid_type) {
172 case FILEID_INO32_GEN_PARENT:
173 case FILEID_INO32_GEN:
174 inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
176 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
177 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
178 inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
182 return d_obtain_alias(inode);
185 STATIC struct dentry *
186 xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
187 int fh_len, int fileid_type)
189 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
190 struct inode *inode = NULL;
192 switch (fileid_type) {
193 case FILEID_INO32_GEN_PARENT:
194 inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
195 fid->i32.parent_gen);
197 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
198 inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
203 return d_obtain_alias(inode);
206 STATIC struct dentry *
208 struct dentry *child)
211 struct xfs_inode *cip;
213 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
215 return ERR_PTR(-error);
217 return d_obtain_alias(VFS_I(cip));
221 xfs_fs_nfs_commit_metadata(
224 struct xfs_inode *ip = XFS_I(inode);
225 struct xfs_mount *mp = ip->i_mount;
228 xfs_ilock(ip, XFS_ILOCK_SHARED);
229 if (xfs_ipincount(ip))
230 lsn = ip->i_itemp->ili_last_lsn;
231 xfs_iunlock(ip, XFS_ILOCK_SHARED);
235 return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
238 const struct export_operations xfs_export_operations = {
239 .encode_fh = xfs_fs_encode_fh,
240 .fh_to_dentry = xfs_fs_fh_to_dentry,
241 .fh_to_parent = xfs_fs_fh_to_parent,
242 .get_parent = xfs_fs_get_parent,
243 .commit_metadata = xfs_fs_nfs_commit_metadata,