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8299a1f4 BB |
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 | /* | |
23 | * Copyright (C) 2011 Lawrence Livermore National Security, LLC. | |
24 | */ | |
25 | ||
26 | #ifndef _ZFS_DCACHE_H | |
a08ee875 | 27 | #define _ZFS_DCACHE_H |
8299a1f4 BB |
28 | |
29 | #include <linux/dcache.h> | |
30 | ||
a08ee875 LG |
31 | #define dname(dentry) ((char *)((dentry)->d_name.name)) |
32 | #define dlen(dentry) ((int)((dentry)->d_name.len)) | |
8299a1f4 | 33 | |
6a0936ba | 34 | #ifndef HAVE_D_MAKE_ROOT |
a08ee875 | 35 | #define d_make_root(inode) d_alloc_root(inode) |
6a0936ba RY |
36 | #endif /* HAVE_D_MAKE_ROOT */ |
37 | ||
f1a05fa1 NB |
38 | /* |
39 | * 2.6.30 API change, | |
40 | * The const keyword was added to the 'struct dentry_operations' in | |
41 | * the dentry structure. To handle this we define an appropriate | |
42 | * dentry_operations_t typedef which can be used. | |
43 | */ | |
44 | #ifdef HAVE_CONST_DENTRY_OPERATIONS | |
45 | typedef const struct dentry_operations dentry_operations_t; | |
46 | #else | |
47 | typedef struct dentry_operations dentry_operations_t; | |
48 | #endif | |
49 | ||
50 | /* | |
51 | * 2.6.38 API change, | |
52 | * Added d_set_d_op() helper function which sets some flags in | |
53 | * dentry->d_flags based on which operations are defined. | |
54 | */ | |
55 | #ifndef HAVE_D_SET_D_OP | |
56 | static inline void | |
57 | d_set_d_op(struct dentry *dentry, dentry_operations_t *op) | |
58 | { | |
59 | dentry->d_op = op; | |
60 | } | |
61 | #endif /* HAVE_D_SET_D_OP */ | |
62 | ||
bf01b5e6 BB |
63 | /* |
64 | * 2.6.38 API addition, | |
65 | * Added d_clear_d_op() helper function which clears some flags and the | |
66 | * registered dentry->d_op table. This is required because d_set_d_op() | |
67 | * issues a warning when the dentry operations table is already set. | |
68 | * For the .zfs control directory to work properly we must be able to | |
69 | * override the default operations table and register custom .d_automount | |
70 | * and .d_revalidate callbacks. | |
71 | */ | |
72 | static inline void | |
73 | d_clear_d_op(struct dentry *dentry) | |
74 | { | |
75 | #ifdef HAVE_D_SET_D_OP | |
76 | dentry->d_op = NULL; | |
a08ee875 LG |
77 | dentry->d_flags &= ~( |
78 | DCACHE_OP_HASH | DCACHE_OP_COMPARE | | |
79 | DCACHE_OP_REVALIDATE | DCACHE_OP_DELETE); | |
bf01b5e6 BB |
80 | #endif /* HAVE_D_SET_D_OP */ |
81 | } | |
82 | ||
8299a1f4 | 83 | #endif /* _ZFS_DCACHE_H */ |