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 Public 8 * License. 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 & 35 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) || 36 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 37 num_blocks *= fs->blocksize / 512; 38 39 b += num_blocks; 40 41 if (fs->super->s_feature_ro_compat & 42 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) { 43 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32; 44 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 45 } else if (b > 0xFFFFFFFF) 46 return EOVERFLOW; 47 inode->i_blocks = b & 0xFFFFFFFF; 48 return 0; 49 } 50 51 errcode_t ext2fs_iblk_sub_blocks(ext2_filsys fs, struct ext2_inode *inode, 52 blk64_t num_blocks) 53 { 54 unsigned long long b = inode->i_blocks; 55 56 if (!(fs->super->s_feature_ro_compat & 57 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) || 58 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 59 num_blocks *= fs->blocksize / 512; 60 61 if (num_blocks > b) 62 return EOVERFLOW; 63 64 b -= num_blocks; 65 66 if (fs->super->s_feature_ro_compat & 67 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) { 68 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32; 69 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 70 } 71 inode->i_blocks = b & 0xFFFFFFFF; 72 return 0; 73 } 74 75 errcode_t ext2fs_iblk_set(ext2_filsys fs, struct ext2_inode *inode, blk64_t b) 76 { 77 if (!(fs->super->s_feature_ro_compat & 78 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) || 79 !(inode->i_flags & EXT4_HUGE_FILE_FL)) 80 b *= fs->blocksize / 512; 81 82 inode->i_blocks = b & 0xFFFFFFFF; 83 if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 84 inode->osd2.linux2.l_i_blocks_hi = b >> 32; 85 else if (b >> 32) 86 return EOVERFLOW; 87 return 0; 88 } 89
