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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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "xfs_mount.h"
27#include "xfs_export.h"
Christoph Hellwig739bfb22007-08-29 10:58:01 +100028#include "xfs_vnodeops.h"
29#include "xfs_bmap_btree.h"
30#include "xfs_inode.h"
Ben Myers978ebd92010-02-17 14:05:16 -060031#include "xfs_inode_item.h"
Christoph Hellwigef35e922010-06-24 11:51:19 +100032#include "xfs_trace.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
Samuel Kvasnica576ecb82010-11-19 13:38:49 +000073 /*
74 * If the the filesystem may contain 64bit inode numbers, we need
75 * to use larger file handles that can represent them.
76 *
77 * While we only allocate inodes that do not fit into 32 bits any
78 * large enough filesystem may contain them, thus the slightly
79 * confusing looking conditional below.
80 */
81 if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
82 (XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
Christoph Hellwigc38344f2007-10-21 16:42:11 -070083 fileid_type |= XFS_FILEID_TYPE_64FLAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85 /*
86 * Only encode if there is enough space given. In practice
87 * this means we can't export a filesystem with 64bit inodes
88 * over NFSv2 with the subtree_check export option; the other
89 * seven combinations work. The real answer is "don't use v2".
90 */
Christoph Hellwigc38344f2007-10-21 16:42:11 -070091 len = xfs_fileid_length(fileid_type);
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053092 if (*max_len < len) {
93 *max_len = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 return 255;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053095 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 *max_len = len;
97
Christoph Hellwigc38344f2007-10-21 16:42:11 -070098 switch (fileid_type) {
99 case FILEID_INO32_GEN_PARENT:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 spin_lock(&dentry->d_lock);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700101 fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino;
102 fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 spin_unlock(&dentry->d_lock);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700104 /*FALLTHRU*/
105 case FILEID_INO32_GEN:
106 fid->i32.ino = inode->i_ino;
107 fid->i32.gen = inode->i_generation;
108 break;
109 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
110 spin_lock(&dentry->d_lock);
111 fid64->parent_ino = dentry->d_parent->d_inode->i_ino;
112 fid64->parent_gen = dentry->d_parent->d_inode->i_generation;
113 spin_unlock(&dentry->d_lock);
114 /*FALLTHRU*/
115 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
116 fid64->ino = inode->i_ino;
117 fid64->gen = inode->i_generation;
118 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700120
121 return fileid_type;
122}
123
124STATIC struct inode *
125xfs_nfs_get_inode(
126 struct super_block *sb,
127 u64 ino,
128 u32 generation)
129 {
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100130 xfs_mount_t *mp = XFS_M(sb);
131 xfs_inode_t *ip;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700132 int error;
133
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100134 /*
135 * NFS can sometimes send requests for ino 0. Fail them gracefully.
136 */
137 if (ino == 0)
138 return ERR_PTR(-ESTALE);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700139
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500140 /*
Dave Chinner19207792010-06-24 11:15:47 +1000141 * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
142 * fine and not an indication of a corrupted filesystem as clients can
143 * send invalid file handles and we have to handle it gracefully..
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500144 */
Christoph Hellwigef35e922010-06-24 11:51:19 +1000145 error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500146 if (error) {
147 /*
148 * EINVAL means the inode cluster doesn't exist anymore.
149 * This implies the filehandle is stale, so we should
150 * translate it here.
151 * We don't use ESTALE directly down the chain to not
152 * confuse applications using bulkstat that expect EINVAL.
153 */
J. Bruce Fieldsad1a2c82011-07-14 20:50:36 +0000154 if (error == EINVAL || error == ENOENT)
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500155 error = ESTALE;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700156 return ERR_PTR(-error);
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500157 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700158
Christoph Hellwig6a7f4222008-04-22 17:33:40 +1000159 if (ip->i_d.di_gen != generation) {
Christoph Hellwigef35e922010-06-24 11:51:19 +1000160 IRELE(ip);
J. Bruce Fieldsad1a2c82011-07-14 20:50:36 +0000161 return ERR_PTR(-ESTALE);
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100162 }
163
David Chinner01651642008-08-13 15:45:15 +1000164 return VFS_I(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
167STATIC struct dentry *
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700168xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
169 int fh_len, int fileid_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700171 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
172 struct inode *inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700174 if (fh_len < xfs_fileid_length(fileid_type))
175 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700177 switch (fileid_type) {
178 case FILEID_INO32_GEN_PARENT:
179 case FILEID_INO32_GEN:
180 inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
181 break;
182 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
183 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
184 inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
185 break;
186 }
187
Christoph Hellwig44003722008-08-11 15:49:04 +0200188 return d_obtain_alias(inode);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700189}
190
191STATIC struct dentry *
192xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
193 int fh_len, int fileid_type)
194{
195 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
196 struct inode *inode = NULL;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700197
198 switch (fileid_type) {
199 case FILEID_INO32_GEN_PARENT:
200 inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
201 fid->i32.parent_gen);
202 break;
203 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
204 inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
205 fid64->parent_gen);
206 break;
207 }
208
Christoph Hellwig44003722008-08-11 15:49:04 +0200209 return d_obtain_alias(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210}
211
212STATIC struct dentry *
Nathan Scotta50cd262006-03-14 14:06:18 +1100213xfs_fs_get_parent(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 struct dentry *child)
215{
216 int error;
Christoph Hellwigef1f5e72008-03-06 13:46:25 +1100217 struct xfs_inode *cip;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Barry Naujok384f3ce2008-05-21 16:58:22 +1000219 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 if (unlikely(error))
221 return ERR_PTR(-error);
222
Christoph Hellwig44003722008-08-11 15:49:04 +0200223 return d_obtain_alias(VFS_I(cip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
Ben Myers978ebd92010-02-17 14:05:16 -0600226STATIC int
227xfs_fs_nfs_commit_metadata(
228 struct inode *inode)
229{
230 struct xfs_inode *ip = XFS_I(inode);
231 struct xfs_mount *mp = ip->i_mount;
232 int error = 0;
233
234 xfs_ilock(ip, XFS_ILOCK_SHARED);
235 if (xfs_ipincount(ip)) {
J. Bruce Fields4ea41e2d2010-03-04 12:03:16 -0500236 error = _xfs_log_force_lsn(mp, ip->i_itemp->ili_last_lsn,
237 XFS_LOG_SYNC, NULL);
Ben Myers978ebd92010-02-17 14:05:16 -0600238 }
239 xfs_iunlock(ip, XFS_ILOCK_SHARED);
240
241 return error;
242}
243
Christoph Hellwig39655162007-10-21 16:42:17 -0700244const struct export_operations xfs_export_operations = {
Nathan Scotta50cd262006-03-14 14:06:18 +1100245 .encode_fh = xfs_fs_encode_fh,
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700246 .fh_to_dentry = xfs_fs_fh_to_dentry,
247 .fh_to_parent = xfs_fs_fh_to_parent,
Nathan Scotta50cd262006-03-14 14:06:18 +1100248 .get_parent = xfs_fs_get_parent,
Ben Myers978ebd92010-02-17 14:05:16 -0600249 .commit_metadata = xfs_fs_nfs_commit_metadata,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250};