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18#include "xfs.h"
19#include "xfs_types.h"
20#include "xfs_inum.h"
21#include "xfs_log.h"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_dir2.h"
26#include "xfs_mount.h"
27#include "xfs_export.h"
28#include "xfs_vnodeops.h"
29#include "xfs_bmap_btree.h"
30#include "xfs_inode.h"
31#include "xfs_inode_item.h"
32#include "xfs_trace.h"
33
34
35
36
37
38
39static int xfs_fileid_length(int fileid_type)
40{
41 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;
50 }
51 return 255;
52}
53
54STATIC int
55xfs_fs_encode_fh(
56 struct dentry *dentry,
57 __u32 *fh,
58 int *max_len,
59 int connectable)
60{
61 struct fid *fid = (struct fid *)fh;
62 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
63 struct inode *inode = dentry->d_inode;
64 int fileid_type;
65 int len;
66
67
68 if (S_ISDIR(inode->i_mode) || !connectable)
69 fileid_type = FILEID_INO32_GEN;
70 else
71 fileid_type = FILEID_INO32_GEN_PARENT;
72
73
74
75
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78
79
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))
83 fileid_type |= XFS_FILEID_TYPE_64FLAG;
84
85
86
87
88
89
90
91 len = xfs_fileid_length(fileid_type);
92 if (*max_len < len)
93 return 255;
94 *max_len = len;
95
96 switch (fileid_type) {
97 case FILEID_INO32_GEN_PARENT:
98 spin_lock(&dentry->d_lock);
99 fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino;
100 fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
101 spin_unlock(&dentry->d_lock);
102
103 case FILEID_INO32_GEN:
104 fid->i32.ino = inode->i_ino;
105 fid->i32.gen = inode->i_generation;
106 break;
107 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
108 spin_lock(&dentry->d_lock);
109 fid64->parent_ino = dentry->d_parent->d_inode->i_ino;
110 fid64->parent_gen = dentry->d_parent->d_inode->i_generation;
111 spin_unlock(&dentry->d_lock);
112
113 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
114 fid64->ino = inode->i_ino;
115 fid64->gen = inode->i_generation;
116 break;
117 }
118
119 return fileid_type;
120}
121
122STATIC struct inode *
123xfs_nfs_get_inode(
124 struct super_block *sb,
125 u64 ino,
126 u32 generation)
127 {
128 xfs_mount_t *mp = XFS_M(sb);
129 xfs_inode_t *ip;
130 int error;
131
132
133
134
135 if (ino == 0)
136 return ERR_PTR(-ESTALE);
137
138
139
140
141
142
143 error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
144 if (error) {
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149
150
151
152 if (error == EINVAL)
153 error = ESTALE;
154 return ERR_PTR(-error);
155 }
156
157 if (ip->i_d.di_gen != generation) {
158 IRELE(ip);
159 return ERR_PTR(-ENOENT);
160 }
161
162 return VFS_I(ip);
163}
164
165STATIC struct dentry *
166xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
167 int fh_len, int fileid_type)
168{
169 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
170 struct inode *inode = NULL;
171
172 if (fh_len < xfs_fileid_length(fileid_type))
173 return NULL;
174
175 switch (fileid_type) {
176 case FILEID_INO32_GEN_PARENT:
177 case FILEID_INO32_GEN:
178 inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
179 break;
180 case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
181 case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
182 inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
183 break;
184 }
185
186 return d_obtain_alias(inode);
187}
188
189STATIC struct dentry *
190xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
191 int fh_len, int fileid_type)
192{
193 struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
194 struct inode *inode = NULL;
195
196 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
207 return d_obtain_alias(inode);
208}
209
210STATIC struct dentry *
211xfs_fs_get_parent(
212 struct dentry *child)
213{
214 int error;
215 struct xfs_inode *cip;
216
217 error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
218 if (unlikely(error))
219 return ERR_PTR(-error);
220
221 return d_obtain_alias(VFS_I(cip));
222}
223
224STATIC 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;
230 int error = 0;
231
232 xfs_ilock(ip, XFS_ILOCK_SHARED);
233 if (xfs_ipincount(ip)) {
234 error = _xfs_log_force_lsn(mp, ip->i_itemp->ili_last_lsn,
235 XFS_LOG_SYNC, NULL);
236 }
237 xfs_iunlock(ip, XFS_ILOCK_SHARED);
238
239 return error;
240}
241
242const struct export_operations xfs_export_operations = {
243 .encode_fh = xfs_fs_encode_fh,
244 .fh_to_dentry = xfs_fs_fh_to_dentry,
245 .fh_to_parent = xfs_fs_fh_to_parent,
246 .get_parent = xfs_fs_get_parent,
247 .commit_metadata = xfs_fs_nfs_commit_metadata,
248};
249