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_mount.h"
27 #include "xfs_export.h"
28 #include "xfs_vnodeops.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_inode.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_trace.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
, 0, &ip
);
138 * EINVAL means the inode cluster doesn't exist anymore.
139 * This implies the filehandle is stale, so we should
141 * We don't use ESTALE directly down the chain to not
142 * confuse applications using bulkstat that expect EINVAL.
146 return ERR_PTR(-error
);
149 if (ip
->i_d
.di_gen
!= generation
) {
151 return ERR_PTR(-ENOENT
);
157 STATIC
struct dentry
*
158 xfs_fs_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
159 int fh_len
, int fileid_type
)
161 struct xfs_fid64
*fid64
= (struct xfs_fid64
*)fid
;
162 struct inode
*inode
= NULL
;
164 if (fh_len
< xfs_fileid_length(fileid_type
))
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
);
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
);
178 return d_obtain_alias(inode
);
181 STATIC
struct dentry
*
182 xfs_fs_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
183 int fh_len
, int fileid_type
)
185 struct xfs_fid64
*fid64
= (struct xfs_fid64
*)fid
;
186 struct inode
*inode
= NULL
;
188 switch (fileid_type
) {
189 case FILEID_INO32_GEN_PARENT
:
190 inode
= xfs_nfs_get_inode(sb
, fid
->i32
.parent_ino
,
191 fid
->i32
.parent_gen
);
193 case FILEID_INO32_GEN_PARENT
| XFS_FILEID_TYPE_64FLAG
:
194 inode
= xfs_nfs_get_inode(sb
, fid64
->parent_ino
,
199 return d_obtain_alias(inode
);
202 STATIC
struct dentry
*
204 struct dentry
*child
)
207 struct xfs_inode
*cip
;
209 error
= xfs_lookup(XFS_I(child
->d_inode
), &xfs_name_dotdot
, &cip
, NULL
);
211 return ERR_PTR(-error
);
213 return d_obtain_alias(VFS_I(cip
));
217 xfs_fs_nfs_commit_metadata(
220 struct xfs_inode
*ip
= XFS_I(inode
);
221 struct xfs_mount
*mp
= ip
->i_mount
;
224 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
225 if (xfs_ipincount(ip
)) {
226 error
= _xfs_log_force_lsn(mp
, ip
->i_itemp
->ili_last_lsn
,
229 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
234 const struct export_operations xfs_export_operations
= {
235 .encode_fh
= xfs_fs_encode_fh
,
236 .fh_to_dentry
= xfs_fs_fh_to_dentry
,
237 .fh_to_parent
= xfs_fs_fh_to_parent
,
238 .get_parent
= xfs_fs_get_parent
,
239 .commit_metadata
= xfs_fs_nfs_commit_metadata
,