1 /* 2 * i_block.c --- Manage the i_block field for i_blocks 3 * 4 * Copyright (C) 2008 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Library 8 * General Public License, version 2. 9 * %End-Header% 10 */ 11 12 #include "config.h" 13 #include <stdio.h> 14 #if HAVE_UNISTD_H 15 #include <unistd.h> 16 #endif 17 #include <time.h> 18 #include <string.h> 19 #if HAVE_SYS_STAT_H 20 #include <sys/stat.h> 21 #endif 22 #if HAVE_SYS_TYPES_H 23 #include <sys/types.h> 24 #endif 25 #include <errno.h> 26 27 #include "ext2_fs.h" 28 #include "ext2fs.h" 29 30 errcode_t ext2fs_iblk_add_blocks(ext2_filsys fs, struct ext2_inode *inode, 31 blk64_t num_blocks) 32 { 33 unsigned long long b = inode->i_blocks; 34 35 if (ext2fs_has_feature_huge_file(fs->super)) 36 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32; 37 38 if (!ext2fs_has_feature_huge_file(fs->super) || 39 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 40 num_blocks *= fs->blocksize / 512; 41 num_blocks *= EXT2FS_CLUSTER_RATIO(fs); 42 43 b += num_blocks; 44 45 if (ext2fs_has_feature_huge_file(fs->super)) 46 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 47 else if (b > 0xFFFFFFFF) 48 return EOVERFLOW; 49 inode->i_blocks = b & 0xFFFFFFFF; 50 return 0; 51 } 52 53 errcode_t ext2fs_iblk_sub_blocks(ext2_filsys fs, struct ext2_inode *inode, 54 blk64_t num_blocks) 55 { 56 unsigned long long b = inode->i_blocks; 57 58 if (ext2fs_has_feature_huge_file(fs->super)) 59 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32; 60 61 if (!ext2fs_has_feature_huge_file(fs->super) || 62 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 63 num_blocks *= fs->blocksize / 512; 64 num_blocks *= EXT2FS_CLUSTER_RATIO(fs); 65 66 if (num_blocks > b) 67 return EOVERFLOW; 68 69 b -= num_blocks; 70 71 if (ext2fs_has_feature_huge_file(fs->super)) 72 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 73 inode->i_blocks = b & 0xFFFFFFFF; 74 return 0; 75 } 76 77 errcode_t ext2fs_iblk_set(ext2_filsys fs, struct ext2_inode *inode, blk64_t b) 78 { 79 if (!ext2fs_has_feature_huge_file(fs->super) || 80 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 81 b *= fs->blocksize / 512; 82 b *= EXT2FS_CLUSTER_RATIO(fs); 83 84 inode->i_blocks = b & 0xFFFFFFFF; 85 if (ext2fs_has_feature_huge_file(fs->super)) 86 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 87 else if (b >> 32) 88 return EOVERFLOW; 89 return 0; 90 } 91
