1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/ufs/util.c 4 * 5 * Copyright (C) 1998 6 * Daniel Pirkl <daniel.pirkl@email.cz> 7 * Charles University, Faculty of Mathematics and Physics 8 */ 9 10 #include <linux/string.h> 11 #include <linux/slab.h> 12 #include <linux/buffer_head.h> 13 14 #include "ufs_fs.h" 15 #include "ufs.h" 16 #include "swab.h" 17 #include "util.h" 18 19 struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi, 20 struct super_block *sb, u64 fragment, u64 size) 21 { 22 struct ufs_buffer_head * ubh; 23 unsigned i, j ; 24 u64 count = 0; 25 if (size & ~uspi->s_fmask) 26 return NULL; 27 count = size >> uspi->s_fshift; 28 if (count > UFS_MAXFRAG) 29 return NULL; 30 ubh = kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS); 31 if (!ubh) 32 return NULL; 33 ubh->fragment = fragment; 34 ubh->count = count; 35 for (i = 0; i < count; i++) 36 if (!(ubh->bh[i] = sb_bread(sb, fragment + i))) 37 goto failed; 38 for (; i < UFS_MAXFRAG; i++) 39 ubh->bh[i] = NULL; 40 return ubh; 41 failed: 42 for (j = 0; j < i; j++) 43 brelse (ubh->bh[j]); 44 kfree(ubh); 45 return NULL; 46 } 47 48 struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi, 49 struct super_block *sb, u64 fragment, u64 size) 50 { 51 unsigned i, j; 52 u64 count = 0; 53 if (size & ~uspi->s_fmask) 54 return NULL; 55 count = size >> uspi->s_fshift; 56 if (count <= 0 || count > UFS_MAXFRAG) 57 return NULL; 58 USPI_UBH(uspi)->fragment = fragment; 59 USPI_UBH(uspi)->count = count; 60 for (i = 0; i < count; i++) 61 if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i))) 62 goto failed; 63 for (; i < UFS_MAXFRAG; i++) 64 USPI_UBH(uspi)->bh[i] = NULL; 65 return USPI_UBH(uspi); 66 failed: 67 for (j = 0; j < i; j++) 68 brelse (USPI_UBH(uspi)->bh[j]); 69 return NULL; 70 } 71 72 void ubh_brelse (struct ufs_buffer_head * ubh) 73 { 74 unsigned i; 75 if (!ubh) 76 return; 77 for (i = 0; i < ubh->count; i++) 78 brelse (ubh->bh[i]); 79 kfree (ubh); 80 } 81 82 void ubh_brelse_uspi (struct ufs_sb_private_info * uspi) 83 { 84 unsigned i; 85 if (!USPI_UBH(uspi)) 86 return; 87 for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) { 88 brelse (USPI_UBH(uspi)->bh[i]); 89 USPI_UBH(uspi)->bh[i] = NULL; 90 } 91 } 92 93 void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh) 94 { 95 unsigned i; 96 if (!ubh) 97 return; 98 for ( i = 0; i < ubh->count; i++ ) 99 mark_buffer_dirty (ubh->bh[i]); 100 } 101 102 void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag) 103 { 104 unsigned i; 105 if (!ubh) 106 return; 107 if (flag) { 108 for ( i = 0; i < ubh->count; i++ ) 109 set_buffer_uptodate (ubh->bh[i]); 110 } else { 111 for ( i = 0; i < ubh->count; i++ ) 112 clear_buffer_uptodate (ubh->bh[i]); 113 } 114 } 115 116 void ubh_sync_block(struct ufs_buffer_head *ubh) 117 { 118 if (ubh) { 119 unsigned i; 120 121 for (i = 0; i < ubh->count; i++) 122 write_dirty_buffer(ubh->bh[i], 0); 123 124 for (i = 0; i < ubh->count; i++) 125 wait_on_buffer(ubh->bh[i]); 126 } 127 } 128 129 void ubh_bforget (struct ufs_buffer_head * ubh) 130 { 131 unsigned i; 132 if (!ubh) 133 return; 134 for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) 135 bforget (ubh->bh[i]); 136 } 137 138 int ubh_buffer_dirty (struct ufs_buffer_head * ubh) 139 { 140 unsigned i; 141 unsigned result = 0; 142 if (!ubh) 143 return 0; 144 for ( i = 0; i < ubh->count; i++ ) 145 result |= buffer_dirty(ubh->bh[i]); 146 return result; 147 } 148 149 void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, 150 unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size) 151 { 152 unsigned len, bhno; 153 if (size > (ubh->count << uspi->s_fshift)) 154 size = ubh->count << uspi->s_fshift; 155 bhno = 0; 156 while (size) { 157 len = min_t(unsigned int, size, uspi->s_fsize); 158 memcpy (mem, ubh->bh[bhno]->b_data, len); 159 mem += uspi->s_fsize; 160 size -= len; 161 bhno++; 162 } 163 } 164 165 void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, 166 struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size) 167 { 168 unsigned len, bhno; 169 if (size > (ubh->count << uspi->s_fshift)) 170 size = ubh->count << uspi->s_fshift; 171 bhno = 0; 172 while (size) { 173 len = min_t(unsigned int, size, uspi->s_fsize); 174 memcpy (ubh->bh[bhno]->b_data, mem, len); 175 mem += uspi->s_fsize; 176 size -= len; 177 bhno++; 178 } 179 } 180 181 dev_t 182 ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi) 183 { 184 __u32 fs32; 185 dev_t dev; 186 187 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) 188 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]); 189 else 190 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]); 191 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { 192 case UFS_ST_SUNx86: 193 case UFS_ST_SUN: 194 if ((fs32 & 0xffff0000) == 0 || 195 (fs32 & 0xffff0000) == 0xffff0000) 196 dev = old_decode_dev(fs32 & 0x7fff); 197 else 198 dev = MKDEV(sysv_major(fs32), sysv_minor(fs32)); 199 break; 200 201 default: 202 dev = old_decode_dev(fs32); 203 break; 204 } 205 return dev; 206 } 207 208 void 209 ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev) 210 { 211 __u32 fs32; 212 213 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { 214 case UFS_ST_SUNx86: 215 case UFS_ST_SUN: 216 fs32 = sysv_encode_dev(dev); 217 if ((fs32 & 0xffff8000) == 0) { 218 fs32 = old_encode_dev(dev); 219 } 220 break; 221 222 default: 223 fs32 = old_encode_dev(dev); 224 break; 225 } 226 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) 227 ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32); 228 else 229 ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32); 230 } 231 232 /** 233 * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist 234 * read it from disk. 235 * @mapping: the address_space to search 236 * @index: the page index 237 * 238 * Locates the desired pagecache page, if not exist we'll read it, 239 * locks it, increments its reference 240 * count and returns its address. 241 * 242 */ 243 244 struct page *ufs_get_locked_page(struct address_space *mapping, 245 pgoff_t index) 246 { 247 struct inode *inode = mapping->host; 248 struct page *page = find_lock_page(mapping, index); 249 if (!page) { 250 page = read_mapping_page(mapping, index, NULL); 251 252 if (IS_ERR(page)) { 253 printk(KERN_ERR "ufs_change_blocknr: " 254 "read_mapping_page error: ino %lu, index: %lu\n", 255 mapping->host->i_ino, index); 256 return page; 257 } 258 259 lock_page(page); 260 261 if (unlikely(page->mapping == NULL)) { 262 /* Truncate got there first */ 263 unlock_page(page); 264 put_page(page); 265 return NULL; 266 } 267 } 268 if (!page_has_buffers(page)) 269 create_empty_buffers(page, 1 << inode->i_blkbits, 0); 270 return page; 271 } 272