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055656d4 GB |
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 | |
393b44c7 | 23 | * Copyright (c) 2012 Cyril Plisko. All rights reserved. |
055656d4 GB |
24 | */ |
25 | ||
26 | ||
27 | #include <sys/zfs_vnops.h> | |
28 | #include <sys/zfs_znode.h> | |
ebe7e575 | 29 | #include <sys/zfs_ctldir.h> |
055656d4 GB |
30 | #include <sys/zpl.h> |
31 | ||
32 | ||
33 | static int | |
756c3e5a RY |
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 | |
055656d4 GB |
38 | zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable) |
39 | { | |
055656d4 | 40 | struct inode *ip = dentry->d_inode; |
756c3e5a | 41 | #endif /* HAVE_ENCODE_FH_WITH_INODE */ |
7fad6290 | 42 | fstrans_cookie_t cookie; |
756c3e5a | 43 | fid_t *fid = (fid_t *)fh; |
055656d4 GB |
44 | int len_bytes, rc; |
45 | ||
46 | len_bytes = *max_len * sizeof (__u32); | |
47 | ||
48 | if (len_bytes < offsetof(fid_t, fid_data)) | |
d1d7e268 | 49 | return (255); |
055656d4 GB |
50 | |
51 | fid->fid_len = len_bytes - offsetof(fid_t, fid_data); | |
7fad6290 | 52 | cookie = spl_fstrans_mark(); |
055656d4 | 53 | |
ebe7e575 BB |
54 | if (zfsctl_is_node(ip)) |
55 | rc = zfsctl_fid(ip, fid); | |
56 | else | |
57 | rc = zfs_fid(ip, fid); | |
055656d4 | 58 | |
7fad6290 | 59 | spl_fstrans_unmark(cookie); |
055656d4 GB |
60 | len_bytes = offsetof(fid_t, fid_data) + fid->fid_len; |
61 | *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32); | |
62 | ||
63 | return (rc == 0 ? FILEID_INO32_GEN : 255); | |
64 | } | |
65 | ||
66 | static struct dentry * | |
67 | zpl_dentry_obtain_alias(struct inode *ip) | |
68 | { | |
69 | struct dentry *result; | |
70 | ||
71 | #ifdef HAVE_D_OBTAIN_ALIAS | |
72 | result = d_obtain_alias(ip); | |
73 | #else | |
74 | result = d_alloc_anon(ip); | |
75 | ||
76 | if (result == NULL) { | |
77 | iput(ip); | |
78 | result = ERR_PTR(-ENOMEM); | |
79 | } | |
80 | #endif /* HAVE_D_OBTAIN_ALIAS */ | |
81 | ||
d1d7e268 | 82 | return (result); |
055656d4 GB |
83 | } |
84 | ||
85 | static struct dentry * | |
86 | zpl_fh_to_dentry(struct super_block *sb, struct fid *fh, | |
87 | int fh_len, int fh_type) | |
88 | { | |
055656d4 | 89 | fid_t *fid = (fid_t *)fh; |
7fad6290 | 90 | fstrans_cookie_t cookie; |
055656d4 GB |
91 | struct inode *ip; |
92 | int len_bytes, rc; | |
93 | ||
94 | len_bytes = fh_len * sizeof (__u32); | |
95 | ||
96 | if (fh_type != FILEID_INO32_GEN || | |
97 | len_bytes < offsetof(fid_t, fid_data) || | |
98 | len_bytes < offsetof(fid_t, fid_data) + fid->fid_len) | |
d1d7e268 | 99 | return (ERR_PTR(-EINVAL)); |
055656d4 | 100 | |
7fad6290 | 101 | cookie = spl_fstrans_mark(); |
2cf7f52b | 102 | rc = zfs_vget(sb, &ip, fid); |
7fad6290 | 103 | spl_fstrans_unmark(cookie); |
055656d4 | 104 | |
79065ed5 JS |
105 | if (rc) { |
106 | /* | |
107 | * If we see ENOENT it might mean that an NFSv4 * client | |
108 | * is using a cached inode value in a file handle and | |
109 | * that the sought after file has had its inode changed | |
110 | * by a third party. So change the error to ESTALE | |
111 | * which will trigger a full lookup by the client and | |
112 | * will find the new filename/inode pair if it still | |
113 | * exists. | |
114 | */ | |
115 | if (rc == ENOENT) | |
116 | rc = ESTALE; | |
117 | ||
d1d7e268 | 118 | return (ERR_PTR(-rc)); |
79065ed5 | 119 | } |
055656d4 GB |
120 | |
121 | ASSERT((ip != NULL) && !IS_ERR(ip)); | |
122 | ||
d1d7e268 | 123 | return (zpl_dentry_obtain_alias(ip)); |
055656d4 GB |
124 | } |
125 | ||
126 | static struct dentry * | |
127 | zpl_get_parent(struct dentry *child) | |
128 | { | |
129 | cred_t *cr = CRED(); | |
7fad6290 | 130 | fstrans_cookie_t cookie; |
055656d4 GB |
131 | struct inode *ip; |
132 | int error; | |
133 | ||
134 | crhold(cr); | |
7fad6290 | 135 | cookie = spl_fstrans_mark(); |
055656d4 | 136 | error = -zfs_lookup(child->d_inode, "..", &ip, 0, cr, NULL, NULL); |
7fad6290 | 137 | spl_fstrans_unmark(cookie); |
055656d4 GB |
138 | crfree(cr); |
139 | ASSERT3S(error, <=, 0); | |
140 | ||
141 | if (error) | |
d1d7e268 | 142 | return (ERR_PTR(error)); |
055656d4 | 143 | |
d1d7e268 | 144 | return (zpl_dentry_obtain_alias(ip)); |
055656d4 GB |
145 | } |
146 | ||
393b44c7 CP |
147 | #ifdef HAVE_COMMIT_METADATA |
148 | static int | |
149 | zpl_commit_metadata(struct inode *inode) | |
150 | { | |
151 | cred_t *cr = CRED(); | |
7fad6290 | 152 | fstrans_cookie_t cookie; |
393b44c7 CP |
153 | int error; |
154 | ||
b23975cb AV |
155 | if (zfsctl_is_node(inode)) |
156 | return (0); | |
157 | ||
393b44c7 | 158 | crhold(cr); |
7fad6290 | 159 | cookie = spl_fstrans_mark(); |
393b44c7 | 160 | error = -zfs_fsync(inode, 0, cr); |
7fad6290 | 161 | spl_fstrans_unmark(cookie); |
393b44c7 CP |
162 | crfree(cr); |
163 | ASSERT3S(error, <=, 0); | |
164 | ||
d1d7e268 | 165 | return (error); |
393b44c7 CP |
166 | } |
167 | #endif /* HAVE_COMMIT_METADATA */ | |
168 | ||
055656d4 | 169 | const struct export_operations zpl_export_operations = { |
d1d7e268 MK |
170 | .encode_fh = zpl_encode_fh, |
171 | .fh_to_dentry = zpl_fh_to_dentry, | |
172 | .get_parent = zpl_get_parent, | |
393b44c7 | 173 | #ifdef HAVE_COMMIT_METADATA |
d1d7e268 | 174 | .commit_metadata = zpl_commit_metadata, |
393b44c7 | 175 | #endif /* HAVE_COMMIT_METADATA */ |
055656d4 | 176 | }; |