1eda14cbcSMatt Macy /*
2eda14cbcSMatt Macy * CDDL HEADER START
3eda14cbcSMatt Macy *
4eda14cbcSMatt Macy * The contents of this file are subject to the terms of the
5eda14cbcSMatt Macy * Common Development and Distribution License (the "License").
6eda14cbcSMatt Macy * You may not use this file except in compliance with the License.
7eda14cbcSMatt Macy *
8eda14cbcSMatt Macy * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9271171e0SMartin Matuska * or https://opensource.org/licenses/CDDL-1.0.
10eda14cbcSMatt Macy * See the License for the specific language governing permissions
11eda14cbcSMatt Macy * and limitations under the License.
12eda14cbcSMatt Macy *
13eda14cbcSMatt Macy * When distributing Covered Code, include this CDDL HEADER in each
14eda14cbcSMatt Macy * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15eda14cbcSMatt Macy * If applicable, add the following below this CDDL HEADER, with the
16eda14cbcSMatt Macy * fields enclosed by brackets "[]" replaced with your own identifying
17eda14cbcSMatt Macy * information: Portions Copyright [yyyy] [name of copyright owner]
18eda14cbcSMatt Macy *
19eda14cbcSMatt Macy * CDDL HEADER END
20eda14cbcSMatt Macy */
21eda14cbcSMatt Macy
22eda14cbcSMatt Macy /*
23eda14cbcSMatt Macy * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
24eda14cbcSMatt Macy */
25eda14cbcSMatt Macy
26eda14cbcSMatt Macy #ifndef _ZFS_DCACHE_H
27eda14cbcSMatt Macy #define _ZFS_DCACHE_H
28eda14cbcSMatt Macy
29eda14cbcSMatt Macy #include <linux/dcache.h>
30eda14cbcSMatt Macy
31eda14cbcSMatt Macy #define dname(dentry) ((char *)((dentry)->d_name.name))
32eda14cbcSMatt Macy #define dlen(dentry) ((int)((dentry)->d_name.len))
33eda14cbcSMatt Macy
34eda14cbcSMatt Macy #ifndef HAVE_D_MAKE_ROOT
35eda14cbcSMatt Macy #define d_make_root(inode) d_alloc_root(inode)
36eda14cbcSMatt Macy #endif /* HAVE_D_MAKE_ROOT */
37eda14cbcSMatt Macy
3815f0b8c3SMartin Matuska #ifdef HAVE_DENTRY_D_U_ALIASES
3915f0b8c3SMartin Matuska #define d_alias d_u.d_alias
4015f0b8c3SMartin Matuska #endif
4115f0b8c3SMartin Matuska
42eda14cbcSMatt Macy /*
432a58b312SMartin Matuska * Starting from Linux 5.13, flush_dcache_page() becomes an inline function
442a58b312SMartin Matuska * and under some configurations, may indirectly referencing GPL-only
45*3494f7c0SMartin Matuska * symbols, e.g., cpu_feature_keys on powerpc and PageHuge on riscv.
46*3494f7c0SMartin Matuska * Override this function when it is detected being GPL-only.
472a58b312SMartin Matuska */
482a58b312SMartin Matuska #if defined __powerpc__ && defined HAVE_FLUSH_DCACHE_PAGE_GPL_ONLY
492a58b312SMartin Matuska #include <linux/simd_powerpc.h>
502a58b312SMartin Matuska #define flush_dcache_page(page) do { \
512a58b312SMartin Matuska if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && \
522a58b312SMartin Matuska test_bit(PG_dcache_clean, &(page)->flags)) \
532a58b312SMartin Matuska clear_bit(PG_dcache_clean, &(page)->flags); \
542a58b312SMartin Matuska } while (0)
552a58b312SMartin Matuska #endif
56*3494f7c0SMartin Matuska /*
57*3494f7c0SMartin Matuska * For riscv implementation, the use of PageHuge can be safely removed.
58*3494f7c0SMartin Matuska * Because it handles pages allocated by HugeTLB, while flush_dcache_page
59*3494f7c0SMartin Matuska * in zfs module is only called on kernel pages.
60*3494f7c0SMartin Matuska */
61*3494f7c0SMartin Matuska #if defined __riscv && defined HAVE_FLUSH_DCACHE_PAGE_GPL_ONLY
62*3494f7c0SMartin Matuska #define flush_dcache_page(page) do { \
63*3494f7c0SMartin Matuska if (test_bit(PG_dcache_clean, &(page)->flags)) \
64*3494f7c0SMartin Matuska clear_bit(PG_dcache_clean, &(page)->flags); \
65*3494f7c0SMartin Matuska } while (0)
66*3494f7c0SMartin Matuska #endif
672a58b312SMartin Matuska
682a58b312SMartin Matuska /*
69eda14cbcSMatt Macy * 2.6.30 API change,
70eda14cbcSMatt Macy * The const keyword was added to the 'struct dentry_operations' in
71eda14cbcSMatt Macy * the dentry structure. To handle this we define an appropriate
72eda14cbcSMatt Macy * dentry_operations_t typedef which can be used.
73eda14cbcSMatt Macy */
74eda14cbcSMatt Macy typedef const struct dentry_operations dentry_operations_t;
75eda14cbcSMatt Macy
76eda14cbcSMatt Macy /*
77eda14cbcSMatt Macy * 2.6.38 API addition,
78eda14cbcSMatt Macy * Added d_clear_d_op() helper function which clears some flags and the
79eda14cbcSMatt Macy * registered dentry->d_op table. This is required because d_set_d_op()
80eda14cbcSMatt Macy * issues a warning when the dentry operations table is already set.
81eda14cbcSMatt Macy * For the .zfs control directory to work properly we must be able to
82eda14cbcSMatt Macy * override the default operations table and register custom .d_automount
83eda14cbcSMatt Macy * and .d_revalidate callbacks.
84eda14cbcSMatt Macy */
85eda14cbcSMatt Macy static inline void
d_clear_d_op(struct dentry * dentry)86eda14cbcSMatt Macy d_clear_d_op(struct dentry *dentry)
87eda14cbcSMatt Macy {
88eda14cbcSMatt Macy dentry->d_op = NULL;
89eda14cbcSMatt Macy dentry->d_flags &= ~(
90eda14cbcSMatt Macy DCACHE_OP_HASH | DCACHE_OP_COMPARE |
91eda14cbcSMatt Macy DCACHE_OP_REVALIDATE | DCACHE_OP_DELETE);
92eda14cbcSMatt Macy }
93eda14cbcSMatt Macy
94dbd5678dSMartin Matuska /*
95dbd5678dSMartin Matuska * Walk and invalidate all dentry aliases of an inode
96dbd5678dSMartin Matuska * unless it's a mountpoint
97dbd5678dSMartin Matuska */
98dbd5678dSMartin Matuska static inline void
zpl_d_drop_aliases(struct inode * inode)99dbd5678dSMartin Matuska zpl_d_drop_aliases(struct inode *inode)
100dbd5678dSMartin Matuska {
101dbd5678dSMartin Matuska struct dentry *dentry;
102dbd5678dSMartin Matuska spin_lock(&inode->i_lock);
103dbd5678dSMartin Matuska hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
104dbd5678dSMartin Matuska if (!IS_ROOT(dentry) && !d_mountpoint(dentry) &&
105dbd5678dSMartin Matuska (dentry->d_inode == inode)) {
106dbd5678dSMartin Matuska d_drop(dentry);
107dbd5678dSMartin Matuska }
108dbd5678dSMartin Matuska }
109dbd5678dSMartin Matuska spin_unlock(&inode->i_lock);
110dbd5678dSMartin Matuska }
111eda14cbcSMatt Macy #endif /* _ZFS_DCACHE_H */
112