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
,