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70e083d2 TG |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright (c) 2011 Gunnar Beutner | |
23 | * Copyright (c) 2012 Cyril Plisko. All rights reserved. | |
24 | */ | |
25 | ||
26 | ||
27 | #include <sys/zfs_vnops.h> | |
28 | #include <sys/zfs_znode.h> | |
29 | #include <sys/zfs_ctldir.h> | |
30 | #include <sys/zpl.h> | |
31 | ||
32 | ||
33 | static int | |
34 | #ifdef HAVE_ENCODE_FH_WITH_INODE | |
35 | zpl_encode_fh(struct inode *ip, __u32 *fh, int *max_len, struct inode *parent) | |
36 | { | |
37 | #else | |
38 | zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable) | |
39 | { | |
86e3c28a | 40 | /* CSTYLED */ |
70e083d2 TG |
41 | struct inode *ip = dentry->d_inode; |
42 | #endif /* HAVE_ENCODE_FH_WITH_INODE */ | |
43 | fstrans_cookie_t cookie; | |
44 | fid_t *fid = (fid_t *)fh; | |
45 | int len_bytes, rc; | |
46 | ||
47 | len_bytes = *max_len * sizeof (__u32); | |
48 | ||
49 | if (len_bytes < offsetof(fid_t, fid_data)) | |
50 | return (255); | |
51 | ||
52 | fid->fid_len = len_bytes - offsetof(fid_t, fid_data); | |
53 | cookie = spl_fstrans_mark(); | |
54 | ||
55 | if (zfsctl_is_node(ip)) | |
56 | rc = zfsctl_fid(ip, fid); | |
57 | else | |
58 | rc = zfs_fid(ip, fid); | |
59 | ||
60 | spl_fstrans_unmark(cookie); | |
61 | len_bytes = offsetof(fid_t, fid_data) + fid->fid_len; | |
62 | *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32); | |
63 | ||
64 | return (rc == 0 ? FILEID_INO32_GEN : 255); | |
65 | } | |
66 | ||
67 | static struct dentry * | |
68 | zpl_dentry_obtain_alias(struct inode *ip) | |
69 | { | |
70 | struct dentry *result; | |
71 | ||
72 | #ifdef HAVE_D_OBTAIN_ALIAS | |
73 | result = d_obtain_alias(ip); | |
74 | #else | |
75 | result = d_alloc_anon(ip); | |
76 | ||
77 | if (result == NULL) { | |
78 | iput(ip); | |
79 | result = ERR_PTR(-ENOMEM); | |
80 | } | |
81 | #endif /* HAVE_D_OBTAIN_ALIAS */ | |
82 | ||
83 | return (result); | |
84 | } | |
85 | ||
86 | static struct dentry * | |
87 | zpl_fh_to_dentry(struct super_block *sb, struct fid *fh, | |
88 | int fh_len, int fh_type) | |
89 | { | |
90 | fid_t *fid = (fid_t *)fh; | |
91 | fstrans_cookie_t cookie; | |
92 | struct inode *ip; | |
93 | int len_bytes, rc; | |
94 | ||
95 | len_bytes = fh_len * sizeof (__u32); | |
96 | ||
97 | if (fh_type != FILEID_INO32_GEN || | |
98 | len_bytes < offsetof(fid_t, fid_data) || | |
99 | len_bytes < offsetof(fid_t, fid_data) + fid->fid_len) | |
100 | return (ERR_PTR(-EINVAL)); | |
101 | ||
102 | cookie = spl_fstrans_mark(); | |
103 | rc = zfs_vget(sb, &ip, fid); | |
104 | spl_fstrans_unmark(cookie); | |
105 | ||
106 | if (rc) { | |
107 | /* | |
108 | * If we see ENOENT it might mean that an NFSv4 * client | |
109 | * is using a cached inode value in a file handle and | |
110 | * that the sought after file has had its inode changed | |
111 | * by a third party. So change the error to ESTALE | |
112 | * which will trigger a full lookup by the client and | |
113 | * will find the new filename/inode pair if it still | |
114 | * exists. | |
115 | */ | |
116 | if (rc == ENOENT) | |
117 | rc = ESTALE; | |
118 | ||
119 | return (ERR_PTR(-rc)); | |
120 | } | |
121 | ||
122 | ASSERT((ip != NULL) && !IS_ERR(ip)); | |
123 | ||
124 | return (zpl_dentry_obtain_alias(ip)); | |
125 | } | |
126 | ||
127 | static struct dentry * | |
128 | zpl_get_parent(struct dentry *child) | |
129 | { | |
130 | cred_t *cr = CRED(); | |
131 | fstrans_cookie_t cookie; | |
132 | struct inode *ip; | |
133 | int error; | |
134 | ||
135 | crhold(cr); | |
136 | cookie = spl_fstrans_mark(); | |
137 | error = -zfs_lookup(child->d_inode, "..", &ip, 0, cr, NULL, NULL); | |
138 | spl_fstrans_unmark(cookie); | |
139 | crfree(cr); | |
140 | ASSERT3S(error, <=, 0); | |
141 | ||
142 | if (error) | |
143 | return (ERR_PTR(error)); | |
144 | ||
145 | return (zpl_dentry_obtain_alias(ip)); | |
146 | } | |
147 | ||
148 | #ifdef HAVE_COMMIT_METADATA | |
149 | static int | |
150 | zpl_commit_metadata(struct inode *inode) | |
151 | { | |
152 | cred_t *cr = CRED(); | |
153 | fstrans_cookie_t cookie; | |
154 | int error; | |
155 | ||
156 | if (zfsctl_is_node(inode)) | |
157 | return (0); | |
158 | ||
159 | crhold(cr); | |
160 | cookie = spl_fstrans_mark(); | |
161 | error = -zfs_fsync(inode, 0, cr); | |
162 | spl_fstrans_unmark(cookie); | |
163 | crfree(cr); | |
164 | ASSERT3S(error, <=, 0); | |
165 | ||
166 | return (error); | |
167 | } | |
168 | #endif /* HAVE_COMMIT_METADATA */ | |
169 | ||
170 | const struct export_operations zpl_export_operations = { | |
171 | .encode_fh = zpl_encode_fh, | |
172 | .fh_to_dentry = zpl_fh_to_dentry, | |
173 | .get_parent = zpl_get_parent, | |
174 | #ifdef HAVE_COMMIT_METADATA | |
175 | .commit_metadata = zpl_commit_metadata, | |
176 | #endif /* HAVE_COMMIT_METADATA */ | |
177 | }; |