119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project/* 219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * alloc.c --- allocate new inodes, blocks for ext2fs 319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * 419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. 519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * 619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * %Begin-Header% 78558eab78390d1924cd6b255686ceef133f294d5Ken Sumrall * This file may be redistributed under the terms of the GNU Library 88558eab78390d1924cd6b255686ceef133f294d5Ken Sumrall * General Public License, version 2. 919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * %End-Header% 1019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project */ 1119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 1219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include <stdio.h> 1319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#if HAVE_UNISTD_H 1419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include <unistd.h> 1519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#endif 1619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include <time.h> 1719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include <string.h> 1819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#if HAVE_SYS_STAT_H 1919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include <sys/stat.h> 2019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#endif 2119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#if HAVE_SYS_TYPES_H 2219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include <sys/types.h> 2319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#endif 2419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 2519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include "ext2_fs.h" 2619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project#include "ext2fs.h" 2719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 2819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project/* 293984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt * Check for uninit block bitmaps and deal with them appropriately 303984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt */ 313984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidtstatic void check_block_uninit(ext2_filsys fs, ext2fs_block_bitmap map, 323984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt dgrp_t group) 333984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt{ 343984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk_t i; 353984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk_t blk, super_blk, old_desc_blk, new_desc_blk; 363984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt int old_desc_blocks; 373984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 383984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 393984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) || 403984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt !(fs->group_desc[group].bg_flags & EXT2_BG_BLOCK_UNINIT)) 413984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt return; 423984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 433984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk = (group * fs->super->s_blocks_per_group) + 443984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt fs->super->s_first_data_block; 453984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 463984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt ext2fs_super_and_bgd_loc(fs, group, &super_blk, 473984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt &old_desc_blk, &new_desc_blk, 0); 483984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 493984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (fs->super->s_feature_incompat & 503984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt EXT2_FEATURE_INCOMPAT_META_BG) 513984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt old_desc_blocks = fs->super->s_first_meta_bg; 523984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt else 533984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt old_desc_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks; 543984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 553984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt for (i=0; i < fs->super->s_blocks_per_group; i++, blk++) { 563984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if ((blk == super_blk) || 573984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (old_desc_blk && old_desc_blocks && 583984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (blk >= old_desc_blk) && 593984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (blk < old_desc_blk + old_desc_blocks)) || 603984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (new_desc_blk && (blk == new_desc_blk)) || 613984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (blk == fs->group_desc[group].bg_block_bitmap) || 623984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (blk == fs->group_desc[group].bg_inode_bitmap) || 633984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (blk >= fs->group_desc[group].bg_inode_table && 643984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (blk < fs->group_desc[group].bg_inode_table 653984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt + fs->inode_blocks_per_group))) 663984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt ext2fs_fast_mark_block_bitmap(map, blk); 673984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt else 683984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt ext2fs_fast_unmark_block_bitmap(map, blk); 693984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt } 703984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt fs->group_desc[group].bg_flags &= ~EXT2_BG_BLOCK_UNINIT; 713984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt ext2fs_group_desc_csum_set(fs, group); 723984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt} 733984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 743984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt/* 753984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt * Check for uninit inode bitmaps and deal with them appropriately 763984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt */ 773984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidtstatic void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map, 783984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt dgrp_t group) 793984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt{ 803984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt ext2_ino_t i, ino; 813984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 823984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super, 833984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) || 843984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt !(fs->group_desc[group].bg_flags & EXT2_BG_INODE_UNINIT)) 853984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt return; 863984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 873984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt ino = (group * fs->super->s_inodes_per_group) + 1; 883984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt for (i=0; i < fs->super->s_inodes_per_group; i++, ino++) 893984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt ext2fs_fast_unmark_inode_bitmap(map, ino); 903984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 913984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt fs->group_desc[group].bg_flags &= ~EXT2_BG_INODE_UNINIT; 923984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt check_block_uninit(fs, fs->block_map, group); 933984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt} 943984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 953984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt/* 9619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * Right now, just search forward from the parent directory's block 9719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * group to find the next free inode. 9819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * 9919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * Should have a special policy for directories. 10019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project */ 1013984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidterrcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir, 10219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project int mode EXT2FS_ATTR((unused)), 10319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project ext2fs_inode_bitmap map, ext2_ino_t *ret) 10419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project{ 10519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project ext2_ino_t dir_group = 0; 10619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project ext2_ino_t i; 10719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project ext2_ino_t start_inode; 10819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 10919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 1103984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 11119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!map) 11219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project map = fs->inode_map; 11319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!map) 11419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return EXT2_ET_NO_INODE_BITMAP; 1153984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 1163984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (dir > 0) 11719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project dir_group = (dir - 1) / EXT2_INODES_PER_GROUP(fs->super); 11819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 11919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project start_inode = (dir_group * EXT2_INODES_PER_GROUP(fs->super)) + 1; 12019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (start_inode < EXT2_FIRST_INODE(fs->super)) 12119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project start_inode = EXT2_FIRST_INODE(fs->super); 1223984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (start_inode > fs->super->s_inodes_count) 1233984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt return EXT2_ET_INODE_ALLOC_FAIL; 12419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project i = start_inode; 12519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 12619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project do { 1273984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (((i - 1) % EXT2_INODES_PER_GROUP(fs->super)) == 0) 1283984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt check_inode_uninit(fs, map, (i - 1) / 1293984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt EXT2_INODES_PER_GROUP(fs->super)); 1303984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 13119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!ext2fs_fast_test_inode_bitmap(map, i)) 13219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project break; 13319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project i++; 13419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (i > fs->super->s_inodes_count) 13519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project i = EXT2_FIRST_INODE(fs->super); 13619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project } while (i != start_inode); 1373984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 13819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (ext2fs_test_inode_bitmap(map, i)) 13919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return EXT2_ET_INODE_ALLOC_FAIL; 14019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project *ret = i; 14119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return 0; 14219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project} 14319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 14419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project/* 14519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * Stupid algorithm --- we now just search forward starting from the 14619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * goal. Should put in a smarter one someday.... 14719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project */ 14819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Projecterrcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal, 14919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project ext2fs_block_bitmap map, blk_t *ret) 15019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project{ 15119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project blk_t i; 15219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 15319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 15419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 15519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!map) 15619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project map = fs->block_map; 15719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!map) 15819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return EXT2_ET_NO_BLOCK_BITMAP; 15919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!goal || (goal >= fs->super->s_blocks_count)) 16019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project goal = fs->super->s_first_data_block; 16119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project i = goal; 1623984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt check_block_uninit(fs, map, 1633984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (i - fs->super->s_first_data_block) / 1643984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt EXT2_BLOCKS_PER_GROUP(fs->super)); 16519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project do { 1663984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (((i - fs->super->s_first_data_block) % 1673984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt EXT2_BLOCKS_PER_GROUP(fs->super)) == 0) 1683984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt check_block_uninit(fs, map, 1693984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt (i - fs->super->s_first_data_block) / 1703984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt EXT2_BLOCKS_PER_GROUP(fs->super)); 1713984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 17219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!ext2fs_fast_test_block_bitmap(map, i)) { 17319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project *ret = i; 17419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return 0; 17519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project } 17619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project i++; 17719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (i >= fs->super->s_blocks_count) 17819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project i = fs->super->s_first_data_block; 17919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project } while (i != goal); 18019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return EXT2_ET_BLOCK_ALLOC_FAIL; 18119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project} 18219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 18319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project/* 18419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * This function zeros out the allocated block, and updates all of the 18519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project * appropriate filesystem records. 18619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project */ 18719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Projecterrcode_t ext2fs_alloc_block(ext2_filsys fs, blk_t goal, 18819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project char *block_buf, blk_t *ret) 18919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project{ 19019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project errcode_t retval; 19119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project blk_t block; 19219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project char *buf = 0; 19319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 19419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!block_buf) { 19519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project retval = ext2fs_get_mem(fs->blocksize, &buf); 19619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (retval) 19719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return retval; 19819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project block_buf = buf; 19919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project } 20019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project memset(block_buf, 0, fs->blocksize); 20119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 2023984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (fs->get_alloc_block) { 2033984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk64_t new; 2043984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 2053984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt retval = (fs->get_alloc_block)(fs, (blk64_t) goal, &new); 20619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (retval) 20719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project goto fail; 2083984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt block = (blk_t) new; 2093984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt } else { 2103984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (!fs->block_map) { 2113984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt retval = ext2fs_read_block_bitmap(fs); 2123984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (retval) 2133984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt goto fail; 2143984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt } 21519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 2163984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt retval = ext2fs_new_block(fs, goal, 0, &block); 2173984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (retval) 2183984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt goto fail; 2193984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt } 22019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 22119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project retval = io_channel_write_blk(fs->io, block, 1, block_buf); 22219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (retval) 22319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project goto fail; 2243984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 22519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project ext2fs_block_alloc_stats(fs, block, +1); 22619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project *ret = block; 22719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 22819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Projectfail: 22919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (buf) 23019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project ext2fs_free_mem(&buf); 23119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return retval; 23219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project} 23319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 23419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Projecterrcode_t ext2fs_get_free_blocks(ext2_filsys fs, blk_t start, blk_t finish, 23519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project int num, ext2fs_block_bitmap map, blk_t *ret) 23619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project{ 23719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project blk_t b = start; 23819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 23919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 24019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 24119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!map) 24219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project map = fs->block_map; 24319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!map) 24419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return EXT2_ET_NO_BLOCK_BITMAP; 24519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!b) 24619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project b = fs->super->s_first_data_block; 24719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!finish) 24819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project finish = start; 24919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (!num) 25019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project num = 1; 25119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project do { 25219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (b+num-1 > fs->super->s_blocks_count) 25319dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project b = fs->super->s_first_data_block; 25419dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project if (ext2fs_fast_test_block_bitmap_range(map, b, num)) { 25519dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project *ret = b; 25619dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return 0; 25719dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project } 25819dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project b++; 25919dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project } while (b != finish); 26019dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project return EXT2_ET_BLOCK_ALLOC_FAIL; 26119dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project} 26219dacda2b02bb08c0ffb649f84526b249c749279The Android Open Source Project 2633984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidtvoid ext2fs_set_alloc_block_callback(ext2_filsys fs, 2643984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt errcode_t (*func)(ext2_filsys fs, 2653984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk64_t goal, 2663984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk64_t *ret), 2673984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt errcode_t (**old)(ext2_filsys fs, 2683984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk64_t goal, 2693984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt blk64_t *ret)) 2703984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt{ 2713984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS) 2723984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt return; 2733984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 2743984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt if (old) 2753984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt *old = fs->get_alloc_block; 2763984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt 2773984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt fs->get_alloc_block = func; 2783984b61df41c68966bdfbb2a5e5a45ef4b9a536cDmitry Shmidt} 279