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_vfsops.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
);
130 error
= xfs_iget(mp
, NULL
, ino
, 0, XFS_ILOCK_SHARED
, &ip
, 0);
132 return ERR_PTR(-error
);
134 return ERR_PTR(-EIO
);
136 if (ip
->i_d
.di_gen
!= generation
) {
137 xfs_iput_new(ip
, XFS_ILOCK_SHARED
);
138 return ERR_PTR(-ENOENT
);
141 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
145 STATIC
struct dentry
*
146 xfs_fs_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
147 int fh_len
, int fileid_type
)
149 struct xfs_fid64
*fid64
= (struct xfs_fid64
*)fid
;
150 struct inode
*inode
= NULL
;
152 if (fh_len
< xfs_fileid_length(fileid_type
))
155 switch (fileid_type
) {
156 case FILEID_INO32_GEN_PARENT
:
157 case FILEID_INO32_GEN
:
158 inode
= xfs_nfs_get_inode(sb
, fid
->i32
.ino
, fid
->i32
.gen
);
160 case FILEID_INO32_GEN_PARENT
| XFS_FILEID_TYPE_64FLAG
:
161 case FILEID_INO32_GEN
| XFS_FILEID_TYPE_64FLAG
:
162 inode
= xfs_nfs_get_inode(sb
, fid64
->ino
, fid64
->gen
);
166 return d_obtain_alias(inode
);
169 STATIC
struct dentry
*
170 xfs_fs_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
171 int fh_len
, int fileid_type
)
173 struct xfs_fid64
*fid64
= (struct xfs_fid64
*)fid
;
174 struct inode
*inode
= NULL
;
176 switch (fileid_type
) {
177 case FILEID_INO32_GEN_PARENT
:
178 inode
= xfs_nfs_get_inode(sb
, fid
->i32
.parent_ino
,
179 fid
->i32
.parent_gen
);
181 case FILEID_INO32_GEN_PARENT
| XFS_FILEID_TYPE_64FLAG
:
182 inode
= xfs_nfs_get_inode(sb
, fid64
->parent_ino
,
187 return d_obtain_alias(inode
);
190 STATIC
struct dentry
*
192 struct dentry
*child
)
195 struct xfs_inode
*cip
;
197 error
= xfs_lookup(XFS_I(child
->d_inode
), &xfs_name_dotdot
, &cip
, NULL
);
199 return ERR_PTR(-error
);
201 return d_obtain_alias(VFS_I(cip
));
204 const struct export_operations xfs_export_operations
= {
205 .encode_fh
= xfs_fs_encode_fh
,
206 .fh_to_dentry
= xfs_fs_fh_to_dentry
,
207 .fh_to_parent
= xfs_fs_fh_to_parent
,
208 .get_parent
= xfs_fs_get_parent
,