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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"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110019#include "xfs_format.h"
Dave Chinner239880e2013-10-23 10:50:10 +110020#include "xfs_log_format.h"
21#include "xfs_trans_resv.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_mount.h"
Dave Chinner57062782013-10-15 09:17:51 +110023#include "xfs_da_format.h"
Dave Chinner9a2cc412014-12-04 09:43:17 +110024#include "xfs_da_btree.h"
Dave Chinner2b9ab5a2013-08-12 20:49:37 +100025#include "xfs_dir2.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "xfs_export.h"
Christoph Hellwig739bfb22007-08-29 10:58:01 +100027#include "xfs_inode.h"
Dave Chinner239880e2013-10-23 10:50:10 +110028#include "xfs_trans.h"
Ben Myers978ebd92010-02-17 14:05:16 -060029#include "xfs_inode_item.h"
Christoph Hellwigef35e922010-06-24 11:51:19 +100030#include "xfs_trace.h"
Dave Chinner33479e02012-10-08 21:56:11 +110031#include "xfs_icache.h"
Dave Chinner239880e2013-10-23 10:50:10 +110032#include "xfs_log.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 }
Namjae Jeon94e07a752013-02-17 15:48:11 +090051 return FILEID_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(
Al Virob0b03822012-04-02 14:34:06 -040056 struct inode *inode,
57 __u32 *fh,
58 int *max_len,
59 struct inode *parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
Christoph Hellwigc38344f2007-10-21 16:42:11 -070061 struct fid *fid = (struct fid *)fh;
62 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
Christoph Hellwigc38344f2007-10-21 16:42:11 -070063 int fileid_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66 /* Directories don't need their parent encoded, they have ".." */
Al Virob0b03822012-04-02 14:34:06 -040067 if (!parent)
Christoph Hellwigc38344f2007-10-21 16:42:11 -070068 fileid_type = FILEID_INO32_GEN;
69 else
70 fileid_type = FILEID_INO32_GEN_PARENT;
71
Samuel Kvasnica576ecb82010-11-19 13:38:49 +000072 /*
73 * If the the filesystem may contain 64bit inode numbers, we need
74 * to use larger file handles that can represent them.
75 *
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.
79 */
80 if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
81 (XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
Christoph Hellwigc38344f2007-10-21 16:42:11 -070082 fileid_type |= XFS_FILEID_TYPE_64FLAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 /*
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".
89 */
Christoph Hellwigc38344f2007-10-21 16:42:11 -070090 len = xfs_fileid_length(fileid_type);
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053091 if (*max_len < len) {
92 *max_len = len;
Namjae Jeon94e07a752013-02-17 15:48:11 +090093 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053094 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 *max_len = len;
96
Christoph Hellwigc38344f2007-10-21 16:42:11 -070097 switch (fileid_type) {
98 case FILEID_INO32_GEN_PARENT:
Al Virob0b03822012-04-02 14:34:06 -040099 fid->i32.parent_ino = XFS_I(parent)->i_ino;
100 fid->i32.parent_gen = parent->i_generation;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700101 /*FALLTHRU*/
102 case FILEID_INO32_GEN:
Christoph Hellwigc29f7d42011-11-30 08:58:18 +0000103 fid->i32.ino = XFS_I(inode)->i_ino;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700104 fid->i32.gen = inode->i_generation;
105 break;
106 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
Al Virob0b03822012-04-02 14:34:06 -0400107 fid64->parent_ino = XFS_I(parent)->i_ino;
108 fid64->parent_gen = parent->i_generation;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700109 /*FALLTHRU*/
110 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
Christoph Hellwigc29f7d42011-11-30 08:58:18 +0000111 fid64->ino = XFS_I(inode)->i_ino;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700112 fid64->gen = inode->i_generation;
113 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700115
116 return fileid_type;
117}
118
119STATIC struct inode *
120xfs_nfs_get_inode(
121 struct super_block *sb,
122 u64 ino,
123 u32 generation)
124 {
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100125 xfs_mount_t *mp = XFS_M(sb);
126 xfs_inode_t *ip;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700127 int error;
128
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100129 /*
130 * NFS can sometimes send requests for ino 0. Fail them gracefully.
131 */
132 if (ino == 0)
133 return ERR_PTR(-ESTALE);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700134
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500135 /*
Dave Chinner19207792010-06-24 11:15:47 +1000136 * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
137 * fine and not an indication of a corrupted filesystem as clients can
138 * send invalid file handles and we have to handle it gracefully..
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500139 */
Christoph Hellwigef35e922010-06-24 11:51:19 +1000140 error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500141 if (error) {
142 /*
143 * EINVAL means the inode cluster doesn't exist anymore.
144 * This implies the filehandle is stale, so we should
145 * translate it here.
146 * We don't use ESTALE directly down the chain to not
147 * confuse applications using bulkstat that expect EINVAL.
148 */
Dave Chinner24513372014-06-25 14:58:08 +1000149 if (error == -EINVAL || error == -ENOENT)
150 error = -ESTALE;
151 return ERR_PTR(error);
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500152 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700153
Christoph Hellwig6a7f4222008-04-22 17:33:40 +1000154 if (ip->i_d.di_gen != generation) {
Christoph Hellwigef35e922010-06-24 11:51:19 +1000155 IRELE(ip);
J. Bruce Fieldsad1a2c82011-07-14 20:50:36 +0000156 return ERR_PTR(-ESTALE);
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100157 }
158
David Chinner01651642008-08-13 15:45:15 +1000159 return VFS_I(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160}
161
162STATIC struct dentry *
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700163xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
164 int fh_len, int fileid_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700166 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
167 struct inode *inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700169 if (fh_len < xfs_fileid_length(fileid_type))
170 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700172 switch (fileid_type) {
173 case FILEID_INO32_GEN_PARENT:
174 case FILEID_INO32_GEN:
175 inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
176 break;
177 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
178 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
179 inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
180 break;
181 }
182
Christoph Hellwig44003722008-08-11 15:49:04 +0200183 return d_obtain_alias(inode);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700184}
185
186STATIC struct dentry *
187xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
188 int fh_len, int fileid_type)
189{
190 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
191 struct inode *inode = NULL;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700192
Hugh Dickins35c2a7f2012-10-07 20:32:51 -0700193 if (fh_len < xfs_fileid_length(fileid_type))
194 return NULL;
195
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700196 switch (fileid_type) {
197 case FILEID_INO32_GEN_PARENT:
198 inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
199 fid->i32.parent_gen);
200 break;
201 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
202 inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
203 fid64->parent_gen);
204 break;
205 }
206
Christoph Hellwig44003722008-08-11 15:49:04 +0200207 return d_obtain_alias(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208}
209
210STATIC struct dentry *
Nathan Scotta50cd262006-03-14 14:06:18 +1100211xfs_fs_get_parent(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 struct dentry *child)
213{
214 int error;
Christoph Hellwigef1f5e72008-03-06 13:46:25 +1100215 struct xfs_inode *cip;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Barry Naujok384f3ce2008-05-21 16:58:22 +1000217 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 if (unlikely(error))
Dave Chinner24513372014-06-25 14:58:08 +1000219 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Christoph Hellwig44003722008-08-11 15:49:04 +0200221 return d_obtain_alias(VFS_I(cip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222}
223
Ben Myers978ebd92010-02-17 14:05:16 -0600224STATIC int
225xfs_fs_nfs_commit_metadata(
226 struct inode *inode)
227{
228 struct xfs_inode *ip = XFS_I(inode);
229 struct xfs_mount *mp = ip->i_mount;
Christoph Hellwig8292d882011-09-18 20:47:50 +0000230 xfs_lsn_t lsn = 0;
Ben Myers978ebd92010-02-17 14:05:16 -0600231
232 xfs_ilock(ip, XFS_ILOCK_SHARED);
Christoph Hellwig8292d882011-09-18 20:47:50 +0000233 if (xfs_ipincount(ip))
234 lsn = ip->i_itemp->ili_last_lsn;
Ben Myers978ebd92010-02-17 14:05:16 -0600235 xfs_iunlock(ip, XFS_ILOCK_SHARED);
236
Christoph Hellwig8292d882011-09-18 20:47:50 +0000237 if (!lsn)
238 return 0;
Dave Chinner24513372014-06-25 14:58:08 +1000239 return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
Ben Myers978ebd92010-02-17 14:05:16 -0600240}
241
Christoph Hellwig39655162007-10-21 16:42:17 -0700242const struct export_operations xfs_export_operations = {
Nathan Scotta50cd262006-03-14 14:06:18 +1100243 .encode_fh = xfs_fs_encode_fh,
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700244 .fh_to_dentry = xfs_fs_fh_to_dentry,
245 .fh_to_parent = xfs_fs_fh_to_parent,
Nathan Scotta50cd262006-03-14 14:06:18 +1100246 .get_parent = xfs_fs_get_parent,
Ben Myers978ebd92010-02-17 14:05:16 -0600247 .commit_metadata = xfs_fs_nfs_commit_metadata,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248};