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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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_log.h"
21#include "xfs_trans.h"
22#include "xfs_sb.h"
David Chinnerda353b02007-08-28 14:00:13 +100023#include "xfs_ag.h"
Barry Naujok556b8b12008-04-10 12:22:07 +100024#include "xfs_dir2.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "xfs_mount.h"
26#include "xfs_export.h"
Christoph Hellwig739bfb22007-08-29 10:58:01 +100027#include "xfs_vnodeops.h"
28#include "xfs_bmap_btree.h"
29#include "xfs_inode.h"
Ben Myers978ebd92010-02-17 14:05:16 -060030#include "xfs_inode_item.h"
Christoph Hellwigef35e922010-06-24 11:51:19 +100031#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33/*
Christoph Hellwigc38344f2007-10-21 16:42:11 -070034 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 */
Christoph Hellwigc38344f2007-10-21 16:42:11 -070038static int xfs_fileid_length(int fileid_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
Christoph Hellwigc38344f2007-10-21 16:42:11 -070040 switch (fileid_type) {
41 case FILEID_INO32_GEN:
42 return 2;
43 case FILEID_INO32_GEN_PARENT:
44 return 4;
45 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
46 return 3;
47 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
48 return 6;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -070050 return 255; /* invalid */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051}
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053STATIC int
Nathan Scotta50cd262006-03-14 14:06:18 +110054xfs_fs_encode_fh(
Al Virob0b03822012-04-02 14:34:06 -040055 struct inode *inode,
56 __u32 *fh,
57 int *max_len,
58 struct inode *parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Christoph Hellwigc38344f2007-10-21 16:42:11 -070060 struct fid *fid = (struct fid *)fh;
61 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
Christoph Hellwigc38344f2007-10-21 16:42:11 -070062 int fileid_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 /* Directories don't need their parent encoded, they have ".." */
Al Virob0b03822012-04-02 14:34:06 -040066 if (!parent)
Christoph Hellwigc38344f2007-10-21 16:42:11 -070067 fileid_type = FILEID_INO32_GEN;
68 else
69 fileid_type = FILEID_INO32_GEN_PARENT;
70
Samuel Kvasnica576ecb82010-11-19 13:38:49 +000071 /*
72 * If the the filesystem may contain 64bit inode numbers, we need
73 * to use larger file handles that can represent them.
74 *
75 * While we only allocate inodes that do not fit into 32 bits any
76 * large enough filesystem may contain them, thus the slightly
77 * confusing looking conditional below.
78 */
79 if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
80 (XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
Christoph Hellwigc38344f2007-10-21 16:42:11 -070081 fileid_type |= XFS_FILEID_TYPE_64FLAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83 /*
84 * Only encode if there is enough space given. In practice
85 * this means we can't export a filesystem with 64bit inodes
86 * over NFSv2 with the subtree_check export option; the other
87 * seven combinations work. The real answer is "don't use v2".
88 */
Christoph Hellwigc38344f2007-10-21 16:42:11 -070089 len = xfs_fileid_length(fileid_type);
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053090 if (*max_len < len) {
91 *max_len = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return 255;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053093 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 *max_len = len;
95
Christoph Hellwigc38344f2007-10-21 16:42:11 -070096 switch (fileid_type) {
97 case FILEID_INO32_GEN_PARENT:
Al Virob0b03822012-04-02 14:34:06 -040098 fid->i32.parent_ino = XFS_I(parent)->i_ino;
99 fid->i32.parent_gen = parent->i_generation;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700100 /*FALLTHRU*/
101 case FILEID_INO32_GEN:
Christoph Hellwigc29f7d42011-11-30 08:58:18 +0000102 fid->i32.ino = XFS_I(inode)->i_ino;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700103 fid->i32.gen = inode->i_generation;
104 break;
105 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
Al Virob0b03822012-04-02 14:34:06 -0400106 fid64->parent_ino = XFS_I(parent)->i_ino;
107 fid64->parent_gen = parent->i_generation;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700108 /*FALLTHRU*/
109 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
Christoph Hellwigc29f7d42011-11-30 08:58:18 +0000110 fid64->ino = XFS_I(inode)->i_ino;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700111 fid64->gen = inode->i_generation;
112 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700114
115 return fileid_type;
116}
117
118STATIC struct inode *
119xfs_nfs_get_inode(
120 struct super_block *sb,
121 u64 ino,
122 u32 generation)
123 {
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100124 xfs_mount_t *mp = XFS_M(sb);
125 xfs_inode_t *ip;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700126 int error;
127
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100128 /*
129 * NFS can sometimes send requests for ino 0. Fail them gracefully.
130 */
131 if (ino == 0)
132 return ERR_PTR(-ESTALE);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700133
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500134 /*
Dave Chinner19207792010-06-24 11:15:47 +1000135 * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
136 * fine and not an indication of a corrupted filesystem as clients can
137 * send invalid file handles and we have to handle it gracefully..
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500138 */
Christoph Hellwigef35e922010-06-24 11:51:19 +1000139 error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500140 if (error) {
141 /*
142 * EINVAL means the inode cluster doesn't exist anymore.
143 * This implies the filehandle is stale, so we should
144 * translate it here.
145 * We don't use ESTALE directly down the chain to not
146 * confuse applications using bulkstat that expect EINVAL.
147 */
J. Bruce Fieldsad1a2c82011-07-14 20:50:36 +0000148 if (error == EINVAL || error == ENOENT)
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500149 error = ESTALE;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700150 return ERR_PTR(-error);
Christoph Hellwigc9a98552009-01-01 14:21:16 -0500151 }
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700152
Christoph Hellwig6a7f4222008-04-22 17:33:40 +1000153 if (ip->i_d.di_gen != generation) {
Christoph Hellwigef35e922010-06-24 11:51:19 +1000154 IRELE(ip);
J. Bruce Fieldsad1a2c82011-07-14 20:50:36 +0000155 return ERR_PTR(-ESTALE);
Christoph Hellwigf71354b2007-12-18 16:26:55 +1100156 }
157
David Chinner01651642008-08-13 15:45:15 +1000158 return VFS_I(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
160
161STATIC struct dentry *
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700162xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
163 int fh_len, int fileid_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700165 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
166 struct inode *inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700168 if (fh_len < xfs_fileid_length(fileid_type))
169 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700171 switch (fileid_type) {
172 case FILEID_INO32_GEN_PARENT:
173 case FILEID_INO32_GEN:
174 inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
175 break;
176 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
177 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
178 inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
179 break;
180 }
181
Christoph Hellwig44003722008-08-11 15:49:04 +0200182 return d_obtain_alias(inode);
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700183}
184
185STATIC struct dentry *
186xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
187 int fh_len, int fileid_type)
188{
189 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
190 struct inode *inode = NULL;
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700191
192 switch (fileid_type) {
193 case FILEID_INO32_GEN_PARENT:
194 inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
195 fid->i32.parent_gen);
196 break;
197 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
198 inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
199 fid64->parent_gen);
200 break;
201 }
202
Christoph Hellwig44003722008-08-11 15:49:04 +0200203 return d_obtain_alias(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204}
205
206STATIC struct dentry *
Nathan Scotta50cd262006-03-14 14:06:18 +1100207xfs_fs_get_parent(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 struct dentry *child)
209{
210 int error;
Christoph Hellwigef1f5e72008-03-06 13:46:25 +1100211 struct xfs_inode *cip;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Barry Naujok384f3ce2008-05-21 16:58:22 +1000213 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (unlikely(error))
215 return ERR_PTR(-error);
216
Christoph Hellwig44003722008-08-11 15:49:04 +0200217 return d_obtain_alias(VFS_I(cip));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
Ben Myers978ebd92010-02-17 14:05:16 -0600220STATIC int
221xfs_fs_nfs_commit_metadata(
222 struct inode *inode)
223{
224 struct xfs_inode *ip = XFS_I(inode);
225 struct xfs_mount *mp = ip->i_mount;
Christoph Hellwig8292d882011-09-18 20:47:50 +0000226 xfs_lsn_t lsn = 0;
Ben Myers978ebd92010-02-17 14:05:16 -0600227
228 xfs_ilock(ip, XFS_ILOCK_SHARED);
Christoph Hellwig8292d882011-09-18 20:47:50 +0000229 if (xfs_ipincount(ip))
230 lsn = ip->i_itemp->ili_last_lsn;
Ben Myers978ebd92010-02-17 14:05:16 -0600231 xfs_iunlock(ip, XFS_ILOCK_SHARED);
232
Christoph Hellwig8292d882011-09-18 20:47:50 +0000233 if (!lsn)
234 return 0;
235 return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
Ben Myers978ebd92010-02-17 14:05:16 -0600236}
237
Christoph Hellwig39655162007-10-21 16:42:17 -0700238const struct export_operations xfs_export_operations = {
Nathan Scotta50cd262006-03-14 14:06:18 +1100239 .encode_fh = xfs_fs_encode_fh,
Christoph Hellwigc38344f2007-10-21 16:42:11 -0700240 .fh_to_dentry = xfs_fs_fh_to_dentry,
241 .fh_to_parent = xfs_fs_fh_to_parent,
Nathan Scotta50cd262006-03-14 14:06:18 +1100242 .get_parent = xfs_fs_get_parent,
Ben Myers978ebd92010-02-17 14:05:16 -0600243 .commit_metadata = xfs_fs_nfs_commit_metadata,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244};