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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 RY |
41 | #endif /* HAVE_ENCODE_FH_WITH_INODE */ |
42 | fid_t *fid = (fid_t *)fh; | |
055656d4 GB |
43 | int len_bytes, rc; |
44 | ||
45 | len_bytes = *max_len * sizeof (__u32); | |
46 | ||
47 | if (len_bytes < offsetof(fid_t, fid_data)) | |
48 | return 255; | |
49 | ||
50 | fid->fid_len = len_bytes - offsetof(fid_t, fid_data); | |
51 | ||
ebe7e575 BB |
52 | if (zfsctl_is_node(ip)) |
53 | rc = zfsctl_fid(ip, fid); | |
54 | else | |
55 | rc = zfs_fid(ip, fid); | |
055656d4 GB |
56 | |
57 | len_bytes = offsetof(fid_t, fid_data) + fid->fid_len; | |
58 | *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32); | |
59 | ||
60 | return (rc == 0 ? FILEID_INO32_GEN : 255); | |
61 | } | |
62 | ||
63 | static struct dentry * | |
64 | zpl_dentry_obtain_alias(struct inode *ip) | |
65 | { | |
66 | struct dentry *result; | |
67 | ||
68 | #ifdef HAVE_D_OBTAIN_ALIAS | |
69 | result = d_obtain_alias(ip); | |
70 | #else | |
71 | result = d_alloc_anon(ip); | |
72 | ||
73 | if (result == NULL) { | |
74 | iput(ip); | |
75 | result = ERR_PTR(-ENOMEM); | |
76 | } | |
77 | #endif /* HAVE_D_OBTAIN_ALIAS */ | |
78 | ||
79 | return result; | |
80 | } | |
81 | ||
82 | static struct dentry * | |
83 | zpl_fh_to_dentry(struct super_block *sb, struct fid *fh, | |
84 | int fh_len, int fh_type) | |
85 | { | |
055656d4 GB |
86 | fid_t *fid = (fid_t *)fh; |
87 | struct inode *ip; | |
88 | int len_bytes, rc; | |
89 | ||
90 | len_bytes = fh_len * sizeof (__u32); | |
91 | ||
92 | if (fh_type != FILEID_INO32_GEN || | |
93 | len_bytes < offsetof(fid_t, fid_data) || | |
94 | len_bytes < offsetof(fid_t, fid_data) + fid->fid_len) | |
95 | return ERR_PTR(-EINVAL); | |
96 | ||
2cf7f52b | 97 | rc = zfs_vget(sb, &ip, fid); |
055656d4 GB |
98 | |
99 | if (rc != 0) | |
100 | return ERR_PTR(-rc); | |
101 | ||
102 | ASSERT((ip != NULL) && !IS_ERR(ip)); | |
103 | ||
104 | return zpl_dentry_obtain_alias(ip); | |
105 | } | |
106 | ||
107 | static struct dentry * | |
108 | zpl_get_parent(struct dentry *child) | |
109 | { | |
110 | cred_t *cr = CRED(); | |
111 | struct inode *ip; | |
112 | int error; | |
113 | ||
114 | crhold(cr); | |
115 | error = -zfs_lookup(child->d_inode, "..", &ip, 0, cr, NULL, NULL); | |
116 | crfree(cr); | |
117 | ASSERT3S(error, <=, 0); | |
118 | ||
119 | if (error) | |
120 | return ERR_PTR(error); | |
121 | ||
122 | return zpl_dentry_obtain_alias(ip); | |
123 | } | |
124 | ||
393b44c7 CP |
125 | #ifdef HAVE_COMMIT_METADATA |
126 | static int | |
127 | zpl_commit_metadata(struct inode *inode) | |
128 | { | |
129 | cred_t *cr = CRED(); | |
130 | int error; | |
131 | ||
132 | crhold(cr); | |
133 | error = -zfs_fsync(inode, 0, cr); | |
134 | crfree(cr); | |
135 | ASSERT3S(error, <=, 0); | |
136 | ||
137 | return error; | |
138 | } | |
139 | #endif /* HAVE_COMMIT_METADATA */ | |
140 | ||
055656d4 GB |
141 | const struct export_operations zpl_export_operations = { |
142 | .encode_fh = zpl_encode_fh, | |
143 | .fh_to_dentry = zpl_fh_to_dentry, | |
393b44c7 CP |
144 | .get_parent = zpl_get_parent, |
145 | #ifdef HAVE_COMMIT_METADATA | |
146 | .commit_metadata= zpl_commit_metadata, | |
147 | #endif /* HAVE_COMMIT_METADATA */ | |
055656d4 | 148 | }; |