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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2004-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
19#include "xfs_types.h"
David Chinnerda353b02007-08-28 14:00:13 +100020#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_log.h"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
David Chinnerda353b02007-08-28 14:00:13 +100024#include "xfs_ag.h"
Barry Naujok556b8b12008-04-10 12:22:07 +100025#include "xfs_dir2.h"
David Chinnerda353b02007-08-28 14:00:13 +100026#include "xfs_dmapi.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_mount.h"
28#include "xfs_export.h"
Christoph Hellwig739bfb22007-08-29 10:58:01 +100029#include "xfs_vnodeops.h"
30#include "xfs_bmap_btree.h"
31#include "xfs_inode.h"
Christoph Hellwig745f6912007-08-30 17:20:39 +100032#include "xfs_vfsops.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34/*
Christoph Hellwigc38344f2007-10-21 16:42:11 -070035 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 */
Christoph Hellwigc38344f2007-10-21 16:42:11 -070039static int xfs_fileid_length(int fileid_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
Christoph Hellwigc38344f2007-10-21 16:42:11 -070041 switch (fileid_type) {
42 case FILEID_INO32_GEN:
43 return 2;
44 case FILEID_INO32_GEN_PARENT:
45 return 4;
46 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
47 return 3;
48 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
49 return 6;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -070051 return 255; /* invalid */
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054STATIC int
Nathan Scotta50cd262006-03-14 14:06:18 +110055xfs_fs_encode_fh(
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 struct dentry *dentry,
57 __u32 *fh,
58 int *max_len,
59 int connectable)
60{
Christoph Hellwigc38344f2007-10-21 16:42:11 -070061 struct fid *fid = (struct fid *)fh;
62 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 struct inode *inode = dentry->d_inode;
Christoph Hellwigc38344f2007-10-21 16:42:11 -070064 int fileid_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67 /* Directories don't need their parent encoded, they have ".." */
Christoph Hellwig24bd8612008-03-06 13:45:16 +110068 if (S_ISDIR(inode->i_mode) || !connectable)
Christoph Hellwigc38344f2007-10-21 16:42:11 -070069 fileid_type = FILEID_INO32_GEN;
70 else
71 fileid_type = FILEID_INO32_GEN_PARENT;
72
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 /*
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".
82 */
Christoph Hellwigc38344f2007-10-21 16:42:11 -070083 len = xfs_fileid_length(fileid_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 if (*max_len < len)
85 return 255;
86 *max_len = len;
87
Christoph Hellwigc38344f2007-10-21 16:42:11 -070088 switch (fileid_type) {
89 case FILEID_INO32_GEN_PARENT:
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 spin_lock(&dentry->d_lock);
Christoph Hellwigc38344f2007-10-21 16:42:11 -070091 fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino;
92 fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 spin_unlock(&dentry->d_lock);
Christoph Hellwigc38344f2007-10-21 16:42:11 -070094 /*FALLTHRU*/
95 case FILEID_INO32_GEN:
96 fid->i32.ino = inode->i_ino;
97 fid->i32.gen = inode->i_generation;
98 break;
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);
104 /*FALLTHRU*/
105 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
106 fid64->ino = inode->i_ino;
107 fid64->gen = inode->i_generation;
108 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700110
111 return fileid_type;
112}
113
114STATIC struct inode *
115xfs_nfs_get_inode(
116 struct super_block *sb,
117 u64 ino,
118 u32 generation)
119 {
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100120 xfs_mount_t *mp = XFS_M(sb);
121 xfs_inode_t *ip;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700122 int error;
123
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100124 /*
125 * NFS can sometimes send requests for ino 0. Fail them gracefully.
126 */
127 if (ino == 0)
128 return ERR_PTR(-ESTALE);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700129
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100130 error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700131 if (error)
132 return ERR_PTR(-error);
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100133 if (!ip)
134 return ERR_PTR(-EIO);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700135
Christoph Hellwig6a7f4222008-04-22 17:33:40 +1000136 if (ip->i_d.di_gen != generation) {
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100137 xfs_iput_new(ip, XFS_ILOCK_SHARED);
138 return ERR_PTR(-ENOENT);
139 }
140
141 xfs_iunlock(ip, XFS_ILOCK_SHARED);
David Chinner01651642008-08-13 15:45:15 +1000142 return VFS_I(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
144
145STATIC struct dentry *
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700146xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
147 int fh_len, int fileid_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700149 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
150 struct inode *inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700152 if (fh_len < xfs_fileid_length(fileid_type))
153 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700155 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);
159 break;
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);
163 break;
164 }
165
Christoph Hellwig44003722008-08-11 15:49:04 +0200166 return d_obtain_alias(inode);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700167}
168
169STATIC struct dentry *
170xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
171 int fh_len, int fileid_type)
172{
173 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
174 struct inode *inode = NULL;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700175
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);
180 break;
181 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
182 inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
183 fid64->parent_gen);
184 break;
185 }
186
Christoph Hellwig44003722008-08-11 15:49:04 +0200187 return d_obtain_alias(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188}
189
190STATIC struct dentry *
Nathan Scotta50cd262006-03-14 14:06:18 +1100191xfs_fs_get_parent(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 struct dentry *child)
193{
194 int error;
Christoph Hellwigef1f5e72008-03-06 13:46:25 +1100195 struct xfs_inode *cip;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Barry Naujok384f3ce2008-05-21 16:58:22 +1000197 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 if (unlikely(error))
199 return ERR_PTR(-error);
200
Christoph Hellwig44003722008-08-11 15:49:04 +0200201 return d_obtain_alias(VFS_I(cip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203
Christoph Hellwig39655162007-10-21 16:42:17 -0700204const struct export_operations xfs_export_operations = {
Nathan Scotta50cd262006-03-14 14:06:18 +1100205 .encode_fh = xfs_fs_encode_fh,
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700206 .fh_to_dentry = xfs_fs_fh_to_dentry,
207 .fh_to_parent = xfs_fs_fh_to_parent,
Nathan Scotta50cd262006-03-14 14:06:18 +1100208 .get_parent = xfs_fs_get_parent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209};