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 <stdio.h> 13 #if HAVE_UNISTD_H 14 #include <unistd.h> 15 #endif 16 #include <time.h> 17 #include <string.h> 18 #if HAVE_SYS_STAT_H 19 #include <sys/stat.h> 20 #endif 21 #if HAVE_SYS_TYPES_H 22 #include <sys/types.h> 23 #endif 24 #include <errno.h> 25 26 #include "ext2_fs.h" 27 #include "ext2fs.h" 28 29 errcode_t ext2fs_iblk_add_blocks(ext2_filsys fs, struct ext2_inode *inode, 30 blk64_t num_blocks) 31 { 32 unsigned long long b = inode->i_blocks; 33 34 if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 35 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32; 36 37 if (!(fs->super->s_feature_ro_compat & 38 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) || 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 (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 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 (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 59 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32; 60 61 if (!(fs->super->s_feature_ro_compat & 62 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) || 63 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 64 num_blocks *= fs->blocksize / 512; 65 num_blocks *= EXT2FS_CLUSTER_RATIO(fs); 66 67 if (num_blocks > b) 68 return EOVERFLOW; 69 70 b -= num_blocks; 71 72 if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 73 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 74 inode->i_blocks = b & 0xFFFFFFFF; 75 return 0; 76 } 77 78 errcode_t ext2fs_iblk_set(ext2_filsys fs, struct ext2_inode *inode, blk64_t b) 79 { 80 if (!(fs->super->s_feature_ro_compat & 81 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) || 82 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 83 b *= fs->blocksize / 512; 84 b *= EXT2FS_CLUSTER_RATIO(fs); 85 86 inode->i_blocks = b & 0xFFFFFFFF; 87 if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 88 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 89 else if (b >> 32) 90 return EOVERFLOW; 91 return 0; 92 } 93
