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 */
55 struct dentry *dentry,
60 struct fid *fid = (struct fid *)fh;
61 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
62 struct inode *inode = dentry->d_inode;
66 /* Directories don't need their parent encoded, they have ".." */
67 if (S_ISDIR(inode->i_mode) || !connectable)
68 fileid_type = FILEID_INO32_GEN;
70 fileid_type = FILEID_INO32_GEN_PARENT;
73 * If the the filesystem may contain 64bit inode numbers, we need
74 * to use larger file handles that can represent them.
76 * While we only allocate inodes that do not fit into 32 bits any
77 * large enough filesystem may contain them, thus the slightly
78 * confusing looking conditional below.
80 if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
81 (XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
82 fileid_type |= XFS_FILEID_TYPE_64FLAG;
85 * Only encode if there is enough space given. In practice
86 * this means we can't export a filesystem with 64bit inodes
87 * over NFSv2 with the subtree_check export option; the other
88 * seven combinations work. The real answer is "don't use v2".
90 len = xfs_fileid_length(fileid_type);
97 switch (fileid_type) {
98 case FILEID_INO32_GEN_PARENT:
99 spin_lock(&dentry->d_lock);
100 fid->i32.parent_ino = XFS_I(dentry->d_parent->d_inode)->i_ino;
101 fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
102 spin_unlock(&dentry->d_lock);
104 case FILEID_INO32_GEN:
105 fid->i32.ino = XFS_I(inode)->i_ino;
106 fid->i32.gen = inode->i_generation;
108 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
109 spin_lock(&dentry->d_lock);
110 fid64->parent_ino = XFS_I(dentry->d_parent->d_inode)->i_ino;
111 fid64->parent_gen = dentry->d_parent->d_inode->i_generation;
112 spin_unlock(&dentry->d_lock);
114 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
115 fid64->ino = XFS_I(inode)->i_ino;
116 fid64->gen = inode->i_generation;
123 STATIC struct inode *
125 struct super_block *sb,
129 xfs_mount_t *mp = XFS_M(sb);
134 * NFS can sometimes send requests for ino 0. Fail them gracefully.
137 return ERR_PTR(-ESTALE);
140 * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
141 * fine and not an indication of a corrupted filesystem as clients can
142 * send invalid file handles and we have to handle it gracefully..
144 error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
147 * EINVAL means the inode cluster doesn't exist anymore.
148 * This implies the filehandle is stale, so we should
150 * We don't use ESTALE directly down the chain to not
151 * confuse applications using bulkstat that expect EINVAL.
153 if (error == EINVAL || error == ENOENT)
155 return ERR_PTR(-error);
158 if (ip->i_d.di_gen != generation) {
160 return ERR_PTR(-ESTALE);
166 STATIC struct dentry *
167 xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
168 int fh_len, int fileid_type)
170 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
171 struct inode *inode = NULL;
173 if (fh_len < xfs_fileid_length(fileid_type))
176 switch (fileid_type) {
177 case FILEID_INO32_GEN_PARENT:
178 case FILEID_INO32_GEN:
179 inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
181 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
182 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
183 inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
187 return d_obtain_alias(inode);
190 STATIC struct dentry *
191 xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
192 int fh_len, int fileid_type)
194 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
195 struct inode *inode = NULL;
197 switch (fileid_type) {
198 case FILEID_INO32_GEN_PARENT:
199 inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
200 fid->i32.parent_gen);
202 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
203 inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
208 return d_obtain_alias(inode);
211 STATIC struct dentry *
213 struct dentry *child)
216 struct xfs_inode *cip;
218 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
220 return ERR_PTR(-error);
222 return d_obtain_alias(VFS_I(cip));
226 xfs_fs_nfs_commit_metadata(
229 struct xfs_inode *ip = XFS_I(inode);
230 struct xfs_mount *mp = ip->i_mount;
233 xfs_ilock(ip, XFS_ILOCK_SHARED);
234 if (xfs_ipincount(ip))
235 lsn = ip->i_itemp->ili_last_lsn;
236 xfs_iunlock(ip, XFS_ILOCK_SHARED);
240 return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
243 const struct export_operations xfs_export_operations = {
244 .encode_fh = xfs_fs_encode_fh,
245 .fh_to_dentry = xfs_fs_fh_to_dentry,
246 .fh_to_parent = xfs_fs_fh_to_parent,
247 .get_parent = xfs_fs_get_parent,
248 .commit_metadata = xfs_fs_nfs_commit_metadata,