Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/fs/hfsplus/bnode.c |
| 4 | * |
| 5 | * Copyright (C) 2001 |
| 6 | * Brad Boyer (flar@allandria.com) |
| 7 | * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| 8 | * |
| 9 | * Handle basic btree node operations |
| 10 | */ |
| 11 | |
| 12 | #include <linux/string.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/pagemap.h> |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include "hfsplus_fs.h" |
| 19 | #include "hfsplus_raw.h" |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | /* Copy a specified range of bytes from the raw data of a node */ |
| 22 | void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len) |
| 23 | { |
| 24 | struct page **pagep; |
| 25 | int l; |
| 26 | |
| 27 | off += node->page_offset; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 28 | pagep = node->page + (off >> PAGE_SHIFT); |
| 29 | off &= ~PAGE_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 31 | l = min_t(int, len, PAGE_SIZE - off); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 32 | memcpy_from_page(buf, *pagep, off, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | while ((len -= l) != 0) { |
| 35 | buf += l; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 36 | l = min_t(int, len, PAGE_SIZE); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 37 | memcpy_from_page(buf, *++pagep, 0, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | } |
| 39 | } |
| 40 | |
| 41 | u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off) |
| 42 | { |
| 43 | __be16 data; |
Anton Salikhmetov | 21f2296 | 2010-12-16 18:08:39 +0200 | [diff] [blame] | 44 | /* TODO: optimize later... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | hfs_bnode_read(node, &data, off, 2); |
| 46 | return be16_to_cpu(data); |
| 47 | } |
| 48 | |
| 49 | u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off) |
| 50 | { |
| 51 | u8 data; |
Anton Salikhmetov | 21f2296 | 2010-12-16 18:08:39 +0200 | [diff] [blame] | 52 | /* TODO: optimize later... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | hfs_bnode_read(node, &data, off, 1); |
| 54 | return data; |
| 55 | } |
| 56 | |
| 57 | void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off) |
| 58 | { |
| 59 | struct hfs_btree *tree; |
| 60 | int key_len; |
| 61 | |
| 62 | tree = node->tree; |
| 63 | if (node->type == HFS_NODE_LEAF || |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 64 | tree->attributes & HFS_TREE_VARIDXKEYS || |
| 65 | node->tree->cnid == HFSPLUS_ATTR_CNID) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | key_len = hfs_bnode_read_u16(node, off) + 2; |
| 67 | else |
| 68 | key_len = tree->max_key_len + 2; |
| 69 | |
| 70 | hfs_bnode_read(node, key, off, key_len); |
| 71 | } |
| 72 | |
| 73 | void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len) |
| 74 | { |
| 75 | struct page **pagep; |
| 76 | int l; |
| 77 | |
| 78 | off += node->page_offset; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 79 | pagep = node->page + (off >> PAGE_SHIFT); |
| 80 | off &= ~PAGE_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 82 | l = min_t(int, len, PAGE_SIZE - off); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 83 | memcpy_to_page(*pagep, off, buf, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | set_page_dirty(*pagep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | while ((len -= l) != 0) { |
| 87 | buf += l; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 88 | l = min_t(int, len, PAGE_SIZE); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 89 | memcpy_to_page(*++pagep, 0, buf, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | set_page_dirty(*pagep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | } |
| 93 | |
| 94 | void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data) |
| 95 | { |
| 96 | __be16 v = cpu_to_be16(data); |
Anton Salikhmetov | 21f2296 | 2010-12-16 18:08:39 +0200 | [diff] [blame] | 97 | /* TODO: optimize later... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | hfs_bnode_write(node, &v, off, 2); |
| 99 | } |
| 100 | |
| 101 | void hfs_bnode_clear(struct hfs_bnode *node, int off, int len) |
| 102 | { |
| 103 | struct page **pagep; |
| 104 | int l; |
| 105 | |
| 106 | off += node->page_offset; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 107 | pagep = node->page + (off >> PAGE_SHIFT); |
| 108 | off &= ~PAGE_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 110 | l = min_t(int, len, PAGE_SIZE - off); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 111 | memzero_page(*pagep, off, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | set_page_dirty(*pagep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | while ((len -= l) != 0) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 115 | l = min_t(int, len, PAGE_SIZE); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 116 | memzero_page(*++pagep, 0, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | set_page_dirty(*pagep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | } |
| 119 | } |
| 120 | |
| 121 | void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst, |
| 122 | struct hfs_bnode *src_node, int src, int len) |
| 123 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | struct page **src_page, **dst_page; |
| 125 | int l; |
| 126 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 127 | hfs_dbg(BNODE_MOD, "copybytes: %u,%u,%u\n", dst, src, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | if (!len) |
| 129 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | src += src_node->page_offset; |
| 131 | dst += dst_node->page_offset; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 132 | src_page = src_node->page + (src >> PAGE_SHIFT); |
| 133 | src &= ~PAGE_MASK; |
| 134 | dst_page = dst_node->page + (dst >> PAGE_SHIFT); |
| 135 | dst &= ~PAGE_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | if (src == dst) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 138 | l = min_t(int, len, PAGE_SIZE - src); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 139 | memcpy_page(*dst_page, src, *src_page, src, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | set_page_dirty(*dst_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
| 142 | while ((len -= l) != 0) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 143 | l = min_t(int, len, PAGE_SIZE); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 144 | memcpy_page(*++dst_page, 0, *++src_page, 0, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | set_page_dirty(*dst_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | } else { |
| 148 | void *src_ptr, *dst_ptr; |
| 149 | |
| 150 | do { |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 151 | dst_ptr = kmap_local_page(*dst_page) + dst; |
| 152 | src_ptr = kmap_local_page(*src_page) + src; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 153 | if (PAGE_SIZE - src < PAGE_SIZE - dst) { |
| 154 | l = PAGE_SIZE - src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | src = 0; |
| 156 | dst += l; |
| 157 | } else { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 158 | l = PAGE_SIZE - dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | src += l; |
| 160 | dst = 0; |
| 161 | } |
| 162 | l = min(len, l); |
| 163 | memcpy(dst_ptr, src_ptr, l); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 164 | kunmap_local(src_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | set_page_dirty(*dst_page); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 166 | kunmap_local(dst_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | if (!dst) |
| 168 | dst_page++; |
| 169 | else |
| 170 | src_page++; |
| 171 | } while ((len -= l)); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len) |
| 176 | { |
| 177 | struct page **src_page, **dst_page; |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 178 | void *src_ptr, *dst_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | int l; |
| 180 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 181 | hfs_dbg(BNODE_MOD, "movebytes: %u,%u,%u\n", dst, src, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (!len) |
| 183 | return; |
| 184 | src += node->page_offset; |
| 185 | dst += node->page_offset; |
| 186 | if (dst > src) { |
| 187 | src += len - 1; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 188 | src_page = node->page + (src >> PAGE_SHIFT); |
| 189 | src = (src & ~PAGE_MASK) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | dst += len - 1; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 191 | dst_page = node->page + (dst >> PAGE_SHIFT); |
| 192 | dst = (dst & ~PAGE_MASK) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | if (src == dst) { |
| 195 | while (src < len) { |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 196 | dst_ptr = kmap_local_page(*dst_page); |
| 197 | src_ptr = kmap_local_page(*src_page); |
| 198 | memmove(dst_ptr, src_ptr, src); |
| 199 | kunmap_local(src_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | set_page_dirty(*dst_page); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 201 | kunmap_local(dst_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | len -= src; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 203 | src = PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | src_page--; |
| 205 | dst_page--; |
| 206 | } |
| 207 | src -= len; |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 208 | dst_ptr = kmap_local_page(*dst_page); |
| 209 | src_ptr = kmap_local_page(*src_page); |
| 210 | memmove(dst_ptr + src, src_ptr + src, len); |
| 211 | kunmap_local(src_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | set_page_dirty(*dst_page); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 213 | kunmap_local(dst_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | do { |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 216 | dst_ptr = kmap_local_page(*dst_page) + dst; |
| 217 | src_ptr = kmap_local_page(*src_page) + src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (src < dst) { |
| 219 | l = src; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 220 | src = PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | dst -= l; |
| 222 | } else { |
| 223 | l = dst; |
| 224 | src -= l; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 225 | dst = PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | l = min(len, l); |
| 228 | memmove(dst_ptr - l, src_ptr - l, l); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 229 | kunmap_local(src_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | set_page_dirty(*dst_page); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 231 | kunmap_local(dst_ptr); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 232 | if (dst == PAGE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | dst_page--; |
| 234 | else |
| 235 | src_page--; |
| 236 | } while ((len -= l)); |
| 237 | } |
| 238 | } else { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 239 | src_page = node->page + (src >> PAGE_SHIFT); |
| 240 | src &= ~PAGE_MASK; |
| 241 | dst_page = node->page + (dst >> PAGE_SHIFT); |
| 242 | dst &= ~PAGE_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | if (src == dst) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 245 | l = min_t(int, len, PAGE_SIZE - src); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 246 | |
| 247 | dst_ptr = kmap_local_page(*dst_page) + src; |
| 248 | src_ptr = kmap_local_page(*src_page) + src; |
| 249 | memmove(dst_ptr, src_ptr, l); |
| 250 | kunmap_local(src_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | set_page_dirty(*dst_page); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 252 | kunmap_local(dst_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | while ((len -= l) != 0) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 255 | l = min_t(int, len, PAGE_SIZE); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 256 | dst_ptr = kmap_local_page(*++dst_page); |
| 257 | src_ptr = kmap_local_page(*++src_page); |
| 258 | memmove(dst_ptr, src_ptr, l); |
| 259 | kunmap_local(src_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | set_page_dirty(*dst_page); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 261 | kunmap_local(dst_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | do { |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 265 | dst_ptr = kmap_local_page(*dst_page) + dst; |
| 266 | src_ptr = kmap_local_page(*src_page) + src; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 267 | if (PAGE_SIZE - src < |
| 268 | PAGE_SIZE - dst) { |
| 269 | l = PAGE_SIZE - src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | src = 0; |
| 271 | dst += l; |
| 272 | } else { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 273 | l = PAGE_SIZE - dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | src += l; |
| 275 | dst = 0; |
| 276 | } |
| 277 | l = min(len, l); |
| 278 | memmove(dst_ptr, src_ptr, l); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 279 | kunmap_local(src_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | set_page_dirty(*dst_page); |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 281 | kunmap_local(dst_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | if (!dst) |
| 283 | dst_page++; |
| 284 | else |
| 285 | src_page++; |
| 286 | } while ((len -= l)); |
| 287 | } |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | void hfs_bnode_dump(struct hfs_bnode *node) |
| 292 | { |
| 293 | struct hfs_bnode_desc desc; |
| 294 | __be32 cnid; |
| 295 | int i, off, key_off; |
| 296 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 297 | hfs_dbg(BNODE_MOD, "bnode: %d\n", node->this); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | hfs_bnode_read(node, &desc, 0, sizeof(desc)); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 299 | hfs_dbg(BNODE_MOD, "%d, %d, %d, %d, %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | be32_to_cpu(desc.next), be32_to_cpu(desc.prev), |
| 301 | desc.type, desc.height, be16_to_cpu(desc.num_recs)); |
| 302 | |
| 303 | off = node->tree->node_size - 2; |
| 304 | for (i = be16_to_cpu(desc.num_recs); i >= 0; off -= 2, i--) { |
| 305 | key_off = hfs_bnode_read_u16(node, off); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 306 | hfs_dbg(BNODE_MOD, " %d", key_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | if (i && node->type == HFS_NODE_INDEX) { |
| 308 | int tmp; |
| 309 | |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 310 | if (node->tree->attributes & HFS_TREE_VARIDXKEYS || |
| 311 | node->tree->cnid == HFSPLUS_ATTR_CNID) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | tmp = hfs_bnode_read_u16(node, key_off) + 2; |
| 313 | else |
| 314 | tmp = node->tree->max_key_len + 2; |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 315 | hfs_dbg_cont(BNODE_MOD, " (%d", tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | hfs_bnode_read(node, &cnid, key_off + tmp, 4); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 317 | hfs_dbg_cont(BNODE_MOD, ",%d)", be32_to_cpu(cnid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } else if (i && node->type == HFS_NODE_LEAF) { |
| 319 | int tmp; |
| 320 | |
| 321 | tmp = hfs_bnode_read_u16(node, key_off); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 322 | hfs_dbg_cont(BNODE_MOD, " (%d)", tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | } |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 325 | hfs_dbg_cont(BNODE_MOD, "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | void hfs_bnode_unlink(struct hfs_bnode *node) |
| 329 | { |
| 330 | struct hfs_btree *tree; |
| 331 | struct hfs_bnode *tmp; |
| 332 | __be32 cnid; |
| 333 | |
| 334 | tree = node->tree; |
| 335 | if (node->prev) { |
| 336 | tmp = hfs_bnode_find(tree, node->prev); |
| 337 | if (IS_ERR(tmp)) |
| 338 | return; |
| 339 | tmp->next = node->next; |
| 340 | cnid = cpu_to_be32(tmp->next); |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 341 | hfs_bnode_write(tmp, &cnid, |
| 342 | offsetof(struct hfs_bnode_desc, next), 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | hfs_bnode_put(tmp); |
| 344 | } else if (node->type == HFS_NODE_LEAF) |
| 345 | tree->leaf_head = node->next; |
| 346 | |
| 347 | if (node->next) { |
| 348 | tmp = hfs_bnode_find(tree, node->next); |
| 349 | if (IS_ERR(tmp)) |
| 350 | return; |
| 351 | tmp->prev = node->prev; |
| 352 | cnid = cpu_to_be32(tmp->prev); |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 353 | hfs_bnode_write(tmp, &cnid, |
| 354 | offsetof(struct hfs_bnode_desc, prev), 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | hfs_bnode_put(tmp); |
| 356 | } else if (node->type == HFS_NODE_LEAF) |
| 357 | tree->leaf_tail = node->prev; |
| 358 | |
Anton Salikhmetov | 21f2296 | 2010-12-16 18:08:39 +0200 | [diff] [blame] | 359 | /* move down? */ |
Anton Salikhmetov | b2837fc | 2010-12-16 18:08:41 +0200 | [diff] [blame] | 360 | if (!node->prev && !node->next) |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 361 | hfs_dbg(BNODE_MOD, "hfs_btree_del_level\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | if (!node->parent) { |
| 363 | tree->root = 0; |
| 364 | tree->depth = 0; |
| 365 | } |
| 366 | set_bit(HFS_BNODE_DELETED, &node->flags); |
| 367 | } |
| 368 | |
| 369 | static inline int hfs_bnode_hash(u32 num) |
| 370 | { |
| 371 | num = (num >> 16) + num; |
| 372 | num += num >> 8; |
| 373 | return num & (NODE_HASH_SIZE - 1); |
| 374 | } |
| 375 | |
| 376 | struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid) |
| 377 | { |
| 378 | struct hfs_bnode *node; |
| 379 | |
| 380 | if (cnid >= tree->node_count) { |
Fabian Frederick | e46707d | 2014-06-06 14:36:25 -0700 | [diff] [blame] | 381 | pr_err("request for non-existent node %d in B*Tree\n", |
| 382 | cnid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | return NULL; |
| 384 | } |
| 385 | |
| 386 | for (node = tree->node_hash[hfs_bnode_hash(cnid)]; |
Anton Salikhmetov | b2837fc | 2010-12-16 18:08:41 +0200 | [diff] [blame] | 387 | node; node = node->next_hash) |
| 388 | if (node->this == cnid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | return node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | return NULL; |
| 391 | } |
| 392 | |
| 393 | static struct hfs_bnode *__hfs_bnode_create(struct hfs_btree *tree, u32 cnid) |
| 394 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | struct hfs_bnode *node, *node2; |
| 396 | struct address_space *mapping; |
| 397 | struct page *page; |
| 398 | int size, block, i, hash; |
| 399 | loff_t off; |
| 400 | |
| 401 | if (cnid >= tree->node_count) { |
Fabian Frederick | e46707d | 2014-06-06 14:36:25 -0700 | [diff] [blame] | 402 | pr_err("request for non-existent node %d in B*Tree\n", |
| 403 | cnid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | return NULL; |
| 405 | } |
| 406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | size = sizeof(struct hfs_bnode) + tree->pages_per_bnode * |
| 408 | sizeof(struct page *); |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 409 | node = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | if (!node) |
| 411 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | node->tree = tree; |
| 413 | node->this = cnid; |
| 414 | set_bit(HFS_BNODE_NEW, &node->flags); |
| 415 | atomic_set(&node->refcnt, 1); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 416 | hfs_dbg(BNODE_REFS, "new_node(%d:%d): 1\n", |
| 417 | node->tree->cnid, node->this); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | init_waitqueue_head(&node->lock_wq); |
| 419 | spin_lock(&tree->hash_lock); |
| 420 | node2 = hfs_bnode_findhash(tree, cnid); |
| 421 | if (!node2) { |
| 422 | hash = hfs_bnode_hash(cnid); |
| 423 | node->next_hash = tree->node_hash[hash]; |
| 424 | tree->node_hash[hash] = node; |
| 425 | tree->node_hash_cnt++; |
| 426 | } else { |
| 427 | spin_unlock(&tree->hash_lock); |
| 428 | kfree(node); |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 429 | wait_event(node2->lock_wq, |
| 430 | !test_bit(HFS_BNODE_NEW, &node2->flags)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | return node2; |
| 432 | } |
| 433 | spin_unlock(&tree->hash_lock); |
| 434 | |
| 435 | mapping = tree->inode->i_mapping; |
| 436 | off = (loff_t)cnid << tree->node_size_shift; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 437 | block = off >> PAGE_SHIFT; |
| 438 | node->page_offset = off & ~PAGE_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | for (i = 0; i < tree->pages_per_bnode; block++, i++) { |
Pekka Enberg | 090d2b1 | 2006-06-23 02:05:08 -0700 | [diff] [blame] | 440 | page = read_mapping_page(mapping, block, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | if (IS_ERR(page)) |
| 442 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | node->page[i] = page; |
| 444 | } |
| 445 | |
| 446 | return node; |
| 447 | fail: |
| 448 | set_bit(HFS_BNODE_ERROR, &node->flags); |
| 449 | return node; |
| 450 | } |
| 451 | |
| 452 | void hfs_bnode_unhash(struct hfs_bnode *node) |
| 453 | { |
| 454 | struct hfs_bnode **p; |
| 455 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 456 | hfs_dbg(BNODE_REFS, "remove_node(%d:%d): %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | node->tree->cnid, node->this, atomic_read(&node->refcnt)); |
| 458 | for (p = &node->tree->node_hash[hfs_bnode_hash(node->this)]; |
| 459 | *p && *p != node; p = &(*p)->next_hash) |
| 460 | ; |
Eric Sesterhenn | 0bf3ba5 | 2006-04-01 01:14:43 +0200 | [diff] [blame] | 461 | BUG_ON(!*p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | *p = node->next_hash; |
| 463 | node->tree->node_hash_cnt--; |
| 464 | } |
| 465 | |
| 466 | /* Load a particular node out of a tree */ |
| 467 | struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num) |
| 468 | { |
| 469 | struct hfs_bnode *node; |
| 470 | struct hfs_bnode_desc *desc; |
| 471 | int i, rec_off, off, next_off; |
| 472 | int entry_size, key_size; |
| 473 | |
| 474 | spin_lock(&tree->hash_lock); |
| 475 | node = hfs_bnode_findhash(tree, num); |
| 476 | if (node) { |
| 477 | hfs_bnode_get(node); |
| 478 | spin_unlock(&tree->hash_lock); |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 479 | wait_event(node->lock_wq, |
| 480 | !test_bit(HFS_BNODE_NEW, &node->flags)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (test_bit(HFS_BNODE_ERROR, &node->flags)) |
| 482 | goto node_error; |
| 483 | return node; |
| 484 | } |
| 485 | spin_unlock(&tree->hash_lock); |
| 486 | node = __hfs_bnode_create(tree, num); |
| 487 | if (!node) |
| 488 | return ERR_PTR(-ENOMEM); |
| 489 | if (test_bit(HFS_BNODE_ERROR, &node->flags)) |
| 490 | goto node_error; |
| 491 | if (!test_bit(HFS_BNODE_NEW, &node->flags)) |
| 492 | return node; |
| 493 | |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 494 | desc = (struct hfs_bnode_desc *)(kmap_local_page(node->page[0]) + |
| 495 | node->page_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | node->prev = be32_to_cpu(desc->prev); |
| 497 | node->next = be32_to_cpu(desc->next); |
| 498 | node->num_recs = be16_to_cpu(desc->num_recs); |
| 499 | node->type = desc->type; |
| 500 | node->height = desc->height; |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 501 | kunmap_local(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
| 503 | switch (node->type) { |
| 504 | case HFS_NODE_HEADER: |
| 505 | case HFS_NODE_MAP: |
| 506 | if (node->height != 0) |
| 507 | goto node_error; |
| 508 | break; |
| 509 | case HFS_NODE_LEAF: |
| 510 | if (node->height != 1) |
| 511 | goto node_error; |
| 512 | break; |
| 513 | case HFS_NODE_INDEX: |
| 514 | if (node->height <= 1 || node->height > tree->depth) |
| 515 | goto node_error; |
| 516 | break; |
| 517 | default: |
| 518 | goto node_error; |
| 519 | } |
| 520 | |
| 521 | rec_off = tree->node_size - 2; |
| 522 | off = hfs_bnode_read_u16(node, rec_off); |
| 523 | if (off != sizeof(struct hfs_bnode_desc)) |
| 524 | goto node_error; |
| 525 | for (i = 1; i <= node->num_recs; off = next_off, i++) { |
| 526 | rec_off -= 2; |
| 527 | next_off = hfs_bnode_read_u16(node, rec_off); |
| 528 | if (next_off <= off || |
| 529 | next_off > tree->node_size || |
| 530 | next_off & 1) |
| 531 | goto node_error; |
| 532 | entry_size = next_off - off; |
| 533 | if (node->type != HFS_NODE_INDEX && |
| 534 | node->type != HFS_NODE_LEAF) |
| 535 | continue; |
| 536 | key_size = hfs_bnode_read_u16(node, off) + 2; |
| 537 | if (key_size >= entry_size || key_size & 1) |
| 538 | goto node_error; |
| 539 | } |
| 540 | clear_bit(HFS_BNODE_NEW, &node->flags); |
| 541 | wake_up(&node->lock_wq); |
| 542 | return node; |
| 543 | |
| 544 | node_error: |
| 545 | set_bit(HFS_BNODE_ERROR, &node->flags); |
| 546 | clear_bit(HFS_BNODE_NEW, &node->flags); |
| 547 | wake_up(&node->lock_wq); |
| 548 | hfs_bnode_put(node); |
| 549 | return ERR_PTR(-EIO); |
| 550 | } |
| 551 | |
| 552 | void hfs_bnode_free(struct hfs_bnode *node) |
| 553 | { |
Anton Salikhmetov | 21f2296 | 2010-12-16 18:08:39 +0200 | [diff] [blame] | 554 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Anton Salikhmetov | 21f2296 | 2010-12-16 18:08:39 +0200 | [diff] [blame] | 556 | for (i = 0; i < node->tree->pages_per_bnode; i++) |
| 557 | if (node->page[i]) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 558 | put_page(node->page[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | kfree(node); |
| 560 | } |
| 561 | |
| 562 | struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num) |
| 563 | { |
| 564 | struct hfs_bnode *node; |
| 565 | struct page **pagep; |
| 566 | int i; |
| 567 | |
| 568 | spin_lock(&tree->hash_lock); |
| 569 | node = hfs_bnode_findhash(tree, num); |
| 570 | spin_unlock(&tree->hash_lock); |
| 571 | if (node) { |
Joe Perches | d6142673 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 572 | pr_crit("new node %u already hashed?\n", num); |
Roman Zippel | 634725a | 2006-01-18 17:43:05 -0800 | [diff] [blame] | 573 | WARN_ON(1); |
| 574 | return node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
| 576 | node = __hfs_bnode_create(tree, num); |
| 577 | if (!node) |
| 578 | return ERR_PTR(-ENOMEM); |
| 579 | if (test_bit(HFS_BNODE_ERROR, &node->flags)) { |
| 580 | hfs_bnode_put(node); |
| 581 | return ERR_PTR(-EIO); |
| 582 | } |
| 583 | |
| 584 | pagep = node->page; |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 585 | memzero_page(*pagep, node->page_offset, |
| 586 | min_t(int, PAGE_SIZE, tree->node_size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | set_page_dirty(*pagep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | for (i = 1; i < tree->pages_per_bnode; i++) { |
Fabio M. De Francesco | 6c3014a | 2022-08-09 22:31:03 +0200 | [diff] [blame] | 589 | memzero_page(*++pagep, 0, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | set_page_dirty(*pagep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } |
| 592 | clear_bit(HFS_BNODE_NEW, &node->flags); |
| 593 | wake_up(&node->lock_wq); |
| 594 | |
| 595 | return node; |
| 596 | } |
| 597 | |
| 598 | void hfs_bnode_get(struct hfs_bnode *node) |
| 599 | { |
| 600 | if (node) { |
| 601 | atomic_inc(&node->refcnt); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 602 | hfs_dbg(BNODE_REFS, "get_node(%d:%d): %d\n", |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 603 | node->tree->cnid, node->this, |
| 604 | atomic_read(&node->refcnt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | } |
| 607 | |
| 608 | /* Dispose of resources used by a node */ |
| 609 | void hfs_bnode_put(struct hfs_bnode *node) |
| 610 | { |
| 611 | if (node) { |
| 612 | struct hfs_btree *tree = node->tree; |
| 613 | int i; |
| 614 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 615 | hfs_dbg(BNODE_REFS, "put_node(%d:%d): %d\n", |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 616 | node->tree->cnid, node->this, |
| 617 | atomic_read(&node->refcnt)); |
Eric Sesterhenn | 0bf3ba5 | 2006-04-01 01:14:43 +0200 | [diff] [blame] | 618 | BUG_ON(!atomic_read(&node->refcnt)); |
Roman Zippel | a5e3985 | 2005-09-06 15:18:47 -0700 | [diff] [blame] | 619 | if (!atomic_dec_and_lock(&node->refcnt, &tree->hash_lock)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | for (i = 0; i < tree->pages_per_bnode; i++) { |
Roman Zippel | 74f9c9c | 2005-08-01 21:11:41 -0700 | [diff] [blame] | 622 | if (!node->page[i]) |
| 623 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | mark_page_accessed(node->page[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | if (test_bit(HFS_BNODE_DELETED, &node->flags)) { |
| 628 | hfs_bnode_unhash(node); |
| 629 | spin_unlock(&tree->hash_lock); |
Sergei Antonov | 2cd282a | 2014-06-06 14:36:28 -0700 | [diff] [blame] | 630 | if (hfs_bnode_need_zeroout(tree)) |
| 631 | hfs_bnode_clear(node, 0, tree->node_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | hfs_bmap_free(node); |
| 633 | hfs_bnode_free(node); |
| 634 | return; |
| 635 | } |
| 636 | spin_unlock(&tree->hash_lock); |
| 637 | } |
| 638 | } |
| 639 | |
Sergei Antonov | 2cd282a | 2014-06-06 14:36:28 -0700 | [diff] [blame] | 640 | /* |
| 641 | * Unused nodes have to be zeroed if this is the catalog tree and |
| 642 | * a corresponding flag in the volume header is set. |
| 643 | */ |
| 644 | bool hfs_bnode_need_zeroout(struct hfs_btree *tree) |
| 645 | { |
| 646 | struct super_block *sb = tree->inode->i_sb; |
| 647 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
| 648 | const u32 volume_attr = be32_to_cpu(sbi->s_vhdr->attributes); |
| 649 | |
| 650 | return tree->cnid == HFSPLUS_CAT_CNID && |
| 651 | volume_attr & HFSPLUS_VOL_UNUSED_NODE_FIX; |
| 652 | } |