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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * refcounttree.c | |
5 | * | |
6 | * Copyright (C) 2009 Oracle. All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public | |
10 | * License version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | */ | |
17 | ||
18 | #define MLOG_MASK_PREFIX ML_REFCOUNT | |
19 | #include <cluster/masklog.h> | |
20 | #include "ocfs2.h" | |
21 | #include "inode.h" | |
22 | #include "alloc.h" | |
23 | #include "suballoc.h" | |
24 | #include "journal.h" | |
25 | #include "uptodate.h" | |
26 | #include "super.h" | |
27 | #include "buffer_head_io.h" | |
28 | #include "blockcheck.h" | |
c732eb16 TM |
29 | #include "refcounttree.h" |
30 | ||
31 | static inline struct ocfs2_refcount_tree * | |
32 | cache_info_to_refcount(struct ocfs2_caching_info *ci) | |
33 | { | |
34 | return container_of(ci, struct ocfs2_refcount_tree, rf_ci); | |
35 | } | |
f2c870e3 TM |
36 | |
37 | static int ocfs2_validate_refcount_block(struct super_block *sb, | |
38 | struct buffer_head *bh) | |
39 | { | |
40 | int rc; | |
41 | struct ocfs2_refcount_block *rb = | |
42 | (struct ocfs2_refcount_block *)bh->b_data; | |
43 | ||
44 | mlog(0, "Validating refcount block %llu\n", | |
45 | (unsigned long long)bh->b_blocknr); | |
46 | ||
47 | BUG_ON(!buffer_uptodate(bh)); | |
48 | ||
49 | /* | |
50 | * If the ecc fails, we return the error but otherwise | |
51 | * leave the filesystem running. We know any error is | |
52 | * local to this block. | |
53 | */ | |
54 | rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check); | |
55 | if (rc) { | |
56 | mlog(ML_ERROR, "Checksum failed for refcount block %llu\n", | |
57 | (unsigned long long)bh->b_blocknr); | |
58 | return rc; | |
59 | } | |
60 | ||
61 | ||
62 | if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) { | |
63 | ocfs2_error(sb, | |
64 | "Refcount block #%llu has bad signature %.*s", | |
65 | (unsigned long long)bh->b_blocknr, 7, | |
66 | rb->rf_signature); | |
67 | return -EINVAL; | |
68 | } | |
69 | ||
70 | if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) { | |
71 | ocfs2_error(sb, | |
72 | "Refcount block #%llu has an invalid rf_blkno " | |
73 | "of %llu", | |
74 | (unsigned long long)bh->b_blocknr, | |
75 | (unsigned long long)le64_to_cpu(rb->rf_blkno)); | |
76 | return -EINVAL; | |
77 | } | |
78 | ||
79 | if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) { | |
80 | ocfs2_error(sb, | |
81 | "Refcount block #%llu has an invalid " | |
82 | "rf_fs_generation of #%u", | |
83 | (unsigned long long)bh->b_blocknr, | |
84 | le32_to_cpu(rb->rf_fs_generation)); | |
85 | return -EINVAL; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci, | |
92 | u64 rb_blkno, | |
93 | struct buffer_head **bh) | |
94 | { | |
95 | int rc; | |
96 | struct buffer_head *tmp = *bh; | |
97 | ||
98 | rc = ocfs2_read_block(ci, rb_blkno, &tmp, | |
99 | ocfs2_validate_refcount_block); | |
100 | ||
101 | /* If ocfs2_read_block() got us a new bh, pass it up. */ | |
102 | if (!rc && !*bh) | |
103 | *bh = tmp; | |
104 | ||
105 | return rc; | |
106 | } | |
c732eb16 TM |
107 | |
108 | static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci) | |
109 | { | |
110 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
111 | ||
112 | return rf->rf_blkno; | |
113 | } | |
114 | ||
115 | static struct super_block * | |
116 | ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci) | |
117 | { | |
118 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
119 | ||
120 | return rf->rf_sb; | |
121 | } | |
122 | ||
123 | static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci) | |
124 | { | |
125 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
126 | ||
127 | spin_lock(&rf->rf_lock); | |
128 | } | |
129 | ||
130 | static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci) | |
131 | { | |
132 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
133 | ||
134 | spin_unlock(&rf->rf_lock); | |
135 | } | |
136 | ||
137 | static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci) | |
138 | { | |
139 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
140 | ||
141 | mutex_lock(&rf->rf_io_mutex); | |
142 | } | |
143 | ||
144 | static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci) | |
145 | { | |
146 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
147 | ||
148 | mutex_unlock(&rf->rf_io_mutex); | |
149 | } | |
150 | ||
151 | static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = { | |
152 | .co_owner = ocfs2_refcount_cache_owner, | |
153 | .co_get_super = ocfs2_refcount_cache_get_super, | |
154 | .co_cache_lock = ocfs2_refcount_cache_lock, | |
155 | .co_cache_unlock = ocfs2_refcount_cache_unlock, | |
156 | .co_io_lock = ocfs2_refcount_cache_io_lock, | |
157 | .co_io_unlock = ocfs2_refcount_cache_io_unlock, | |
158 | }; |