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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 | */ | |
24 | ||
25 | ||
26 | #include <sys/zfs_vnops.h> | |
27 | #include <sys/zfs_znode.h> | |
ebe7e575 | 28 | #include <sys/zfs_ctldir.h> |
055656d4 GB |
29 | #include <sys/zpl.h> |
30 | ||
31 | ||
32 | static int | |
33 | zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable) | |
34 | { | |
35 | fid_t *fid = (fid_t *)fh; | |
36 | struct inode *ip = dentry->d_inode; | |
37 | int len_bytes, rc; | |
38 | ||
39 | len_bytes = *max_len * sizeof (__u32); | |
40 | ||
41 | if (len_bytes < offsetof(fid_t, fid_data)) | |
42 | return 255; | |
43 | ||
44 | fid->fid_len = len_bytes - offsetof(fid_t, fid_data); | |
45 | ||
ebe7e575 BB |
46 | if (zfsctl_is_node(ip)) |
47 | rc = zfsctl_fid(ip, fid); | |
48 | else | |
49 | rc = zfs_fid(ip, fid); | |
055656d4 GB |
50 | |
51 | len_bytes = offsetof(fid_t, fid_data) + fid->fid_len; | |
52 | *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32); | |
53 | ||
54 | return (rc == 0 ? FILEID_INO32_GEN : 255); | |
55 | } | |
56 | ||
57 | static struct dentry * | |
58 | zpl_dentry_obtain_alias(struct inode *ip) | |
59 | { | |
60 | struct dentry *result; | |
61 | ||
62 | #ifdef HAVE_D_OBTAIN_ALIAS | |
63 | result = d_obtain_alias(ip); | |
64 | #else | |
65 | result = d_alloc_anon(ip); | |
66 | ||
67 | if (result == NULL) { | |
68 | iput(ip); | |
69 | result = ERR_PTR(-ENOMEM); | |
70 | } | |
71 | #endif /* HAVE_D_OBTAIN_ALIAS */ | |
72 | ||
73 | return result; | |
74 | } | |
75 | ||
76 | static struct dentry * | |
77 | zpl_fh_to_dentry(struct super_block *sb, struct fid *fh, | |
78 | int fh_len, int fh_type) | |
79 | { | |
055656d4 GB |
80 | fid_t *fid = (fid_t *)fh; |
81 | struct inode *ip; | |
82 | int len_bytes, rc; | |
83 | ||
84 | len_bytes = fh_len * sizeof (__u32); | |
85 | ||
86 | if (fh_type != FILEID_INO32_GEN || | |
87 | len_bytes < offsetof(fid_t, fid_data) || | |
88 | len_bytes < offsetof(fid_t, fid_data) + fid->fid_len) | |
89 | return ERR_PTR(-EINVAL); | |
90 | ||
2cf7f52b | 91 | rc = zfs_vget(sb, &ip, fid); |
055656d4 GB |
92 | |
93 | if (rc != 0) | |
94 | return ERR_PTR(-rc); | |
95 | ||
96 | ASSERT((ip != NULL) && !IS_ERR(ip)); | |
97 | ||
98 | return zpl_dentry_obtain_alias(ip); | |
99 | } | |
100 | ||
101 | static struct dentry * | |
102 | zpl_get_parent(struct dentry *child) | |
103 | { | |
104 | cred_t *cr = CRED(); | |
105 | struct inode *ip; | |
106 | int error; | |
107 | ||
108 | crhold(cr); | |
109 | error = -zfs_lookup(child->d_inode, "..", &ip, 0, cr, NULL, NULL); | |
110 | crfree(cr); | |
111 | ASSERT3S(error, <=, 0); | |
112 | ||
113 | if (error) | |
114 | return ERR_PTR(error); | |
115 | ||
116 | return zpl_dentry_obtain_alias(ip); | |
117 | } | |
118 | ||
119 | const struct export_operations zpl_export_operations = { | |
120 | .encode_fh = zpl_encode_fh, | |
121 | .fh_to_dentry = zpl_fh_to_dentry, | |
122 | .get_parent = zpl_get_parent | |
123 | }; |