initialize.c revision 0c17cb25f24730dca138a976a390f105d2191736
1558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch/* 2558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * initialize.c --- initialize a filesystem handle given superblock 3558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * parameters. Used by mke2fs when initializing a filesystem. 4558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * 5558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * Copyright (C) 1994, 1995, 1996 Theodore Ts'o. 6558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * 7ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch * %Begin-Header% 80529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * This file may be redistributed under the terms of the GNU Public 9558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * License. 10424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) * %End-Header% 11ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch */ 12e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 13424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#include <stdio.h> 14558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#include <string.h> 1503b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles)#if HAVE_UNISTD_H 16ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch#include <unistd.h> 175d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#endif 18e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#include <fcntl.h> 19ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch#include <time.h> 20e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#if HAVE_SYS_STAT_H 21f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include <sys/stat.h> 22e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#endif 23558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#if HAVE_SYS_TYPES_H 24558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#include <sys/types.h> 25558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#endif 26558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 275d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "ext2_fs.h" 285d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "ext2fs.h" 29558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 30558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#if defined(__linux__) && defined(EXT2_OS_LINUX) 31558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#define CREATOR_OS EXT2_OS_LINUX 32424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#else 33558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#if defined(__GNU__) && defined(EXT2_OS_HURD) 34558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch#define CREATOR_OS EXT2_OS_HURD 35424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#else 36424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#if defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) 37424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#define CREATOR_OS EXT2_OS_FREEBSD 38424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#else 39424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#if defined(LITES) && defined(EXT2_OS_LITES) 40424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#define CREATOR_OS EXT2_OS_LITES 41424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#else 42424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#define CREATOR_OS EXT2_OS_LINUX /* by default */ 43424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif /* defined(LITES) && defined(EXT2_OS_LITES) */ 44424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif /* defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) */ 45424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif /* defined(__GNU__) && defined(EXT2_OS_HURD) */ 46424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif /* defined(__linux__) && defined(EXT2_OS_LINUX) */ 47558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 48558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch/* 49558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * Note we override the kernel include file's idea of what the default 50558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * check interval (never) should be. It's a good idea to check at 51558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch * least *occasionally*, specially since servers will never rarely get 52e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch * to reboot, since Linux is so robust these days. :-) 53e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch * 54e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch * 180 days (six months) seems like a good value. 55e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch */ 56e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#ifdef EXT2_DFL_CHECKINTERVAL 57e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#undef EXT2_DFL_CHECKINTERVAL 58e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#endif 59e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#define EXT2_DFL_CHECKINTERVAL (86400L * 180L) 60e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 61e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch/* 62e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch * Calculate the number of GDT blocks to reserve for online filesystem growth. 63e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch * The absolute maximum number of GDT blocks we can reserve is determined by 64e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch * the number of block pointers that can fit into a single block. 65e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch */ 66e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdochstatic unsigned int calc_reserved_gdt_blocks(ext2_filsys fs) 67e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch{ 68e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch struct ext2_super_block *sb = fs->super; 69e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned long bpg = sb->s_blocks_per_group; 70e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned int gdpb = fs->blocksize / sizeof(struct ext2_group_desc); 71e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned long max_blocks = 0xffffffff; 72e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned long rsv_groups; 73e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned int rsv_gdb; 74e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 75e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch /* We set it at 1024x the current filesystem size, or 76e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch * the upper block count limit (2^32), whichever is lower. 77e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch */ 78e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch if (sb->s_blocks_count < max_blocks / 1024) 79e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch max_blocks = sb->s_blocks_count * 1024; 80e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch rsv_groups = ext2fs_div_ceil(max_blocks - sb->s_first_data_block, bpg); 81e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) - fs->desc_blocks; 82e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch if (rsv_gdb > EXT2_ADDR_PER_BLOCK(sb)) 83e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch rsv_gdb = EXT2_ADDR_PER_BLOCK(sb); 84e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#ifdef RES_GDT_DEBUG 85e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch printf("max_blocks %lu, rsv_groups = %lu, rsv_gdb = %u\n", 86e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch max_blocks, rsv_groups, rsv_gdb); 87e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#endif 88e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 89e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch return rsv_gdb; 90e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch} 91e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 92e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdocherrcode_t ext2fs_initialize(const char *name, int flags, 93e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch struct ext2_super_block *param, 94e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch io_manager manager, ext2_filsys *ret_fs) 95e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch{ 96e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch ext2_filsys fs; 97e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch errcode_t retval; 98e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch struct ext2_super_block *super; 99e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch int frags_per_block; 100e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned int rem; 101e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned int overhead = 0; 102e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch unsigned int ipg; 103e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch dgrp_t i; 104e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch blk_t numblocks; 105e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch int rsv_gdt; 106e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch int io_flags; 107e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch char *buf; 108e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch char c; 109e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 110e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch if (!param || !param->s_blocks_count) 111e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch return EXT2_ET_INVALID_ARGUMENT; 112e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 113e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs); 1141320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci if (retval) 115e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch return retval; 116e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch 117e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch memset(fs, 0, sizeof(struct struct_ext2_filsys)); 118e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS; 119e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch fs->flags = flags | EXT2_FLAG_RW; 120e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch fs->umask = 022; 1211320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci#ifdef WORDS_BIGENDIAN 122e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch fs->flags |= EXT2_FLAG_SWAP_BYTES; 123e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch#endif 124e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch io_flags = IO_FLAG_RW; 125e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch if (flags & EXT2_FLAG_EXCLUSIVE) 126e5d81f57cb97b3b6b7fccc9c5610d21eb81db09dBen Murdoch io_flags |= IO_FLAG_EXCLUSIVE; 1275d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) retval = manager->open(name, io_flags, &fs->io); 1285d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (retval) 1295d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) goto cleanup; 130558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch fs->image_io = fs->io; 13103b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) fs->io->app_data = fs; 1320529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name); 1330529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch if (retval) 134ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch goto cleanup; 135ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 1365d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) strcpy(fs->device_name, name); 137ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super); 1385d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (retval) 139ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch goto cleanup; 140ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch fs->super = super; 1415d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 142424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) memset(super, 0, SUPERBLOCK_SIZE); 143424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) 1445d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#define set_field(field, default) (super->field = param->field ? \ 1450529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch param->field : (default)) 1460529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 1475d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) super->s_magic = EXT2_SUPER_MAGIC; 1480529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_state = EXT2_VALID_FS; 1490529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 1500529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch set_field(s_log_block_size, 0); /* default blocksize: 1024 bytes */ 151424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) set_field(s_log_frag_size, 0); /* default fragsize: 1024 bytes */ 15203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) set_field(s_first_data_block, super->s_log_block_size ? 0 : 1); 153424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) set_field(s_max_mnt_count, EXT2_DFL_MAX_MNT_COUNT); 1545d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_errors, EXT2_ERRORS_DEFAULT); 1555d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_feature_compat, 0); 1565d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_feature_incompat, 0); 157424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) set_field(s_feature_ro_compat, 0); 1585d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_first_meta_bg, 0); 1595d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_raid_stride, 0); /* default stride size: 0 */ 1605d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_raid_stripe_width, 0); /* default stripe width: 0 */ 1615d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_flags, 0); 1625d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) { 1635d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) retval = EXT2_ET_UNSUPP_FEATURE; 1645d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) goto cleanup; 1655d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 1665d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) { 1675d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) retval = EXT2_ET_RO_UNSUPP_FEATURE; 1685d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) goto cleanup; 1695d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 1705d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 1715d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_rev_level, EXT2_GOOD_OLD_REV); 1725d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (super->s_rev_level >= EXT2_DYNAMIC_REV) { 1735d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO); 1745d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE); 1755d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 1765d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 1775d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_checkinterval, EXT2_DFL_CHECKINTERVAL); 1785d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL); 17903b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) 1805d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) super->s_creator_os = CREATOR_OS; 1815d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 1825d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) fs->blocksize = EXT2_BLOCK_SIZE(super); 1835d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) fs->fragsize = EXT2_FRAG_SIZE(super); 1845d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) frags_per_block = fs->blocksize / fs->fragsize; 1855d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 1865d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) /* default: (fs->blocksize*8) blocks/group, up to 2^16 (GDT limit) */ 1875d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) set_field(s_blocks_per_group, fs->blocksize * 8); 1885d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super)) 1895d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super); 1905d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) super->s_frags_per_group = super->s_blocks_per_group * frags_per_block; 1915d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 192558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch super->s_blocks_count = param->s_blocks_count; 193558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch super->s_r_blocks_count = param->s_r_blocks_count; 1940529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch if (super->s_r_blocks_count >= param->s_blocks_count) { 1950529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch retval = EXT2_ET_INVALID_ARGUMENT; 1960529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch goto cleanup; 1970529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch } 1980529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 1990529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch /* 20003b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * If we're creating an external journal device, we don't need 20103b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * to bother with the rest. 20203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) */ 20303b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) if (super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { 20403b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) fs->group_desc_count = 0; 2050529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch ext2fs_mark_super_dirty(fs); 20603b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) *ret_fs = fs; 2070529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch return 0; 2080529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch } 2090529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 21003b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles)retry: 21103b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) fs->group_desc_count = ext2fs_div_ceil(super->s_blocks_count - 21203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) super->s_first_data_block, 21303b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) EXT2_BLOCKS_PER_GROUP(super)); 21403b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) if (fs->group_desc_count == 0) { 2150529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch retval = EXT2_ET_TOOSMALL; 21603b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) goto cleanup; 2170529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch } 2180529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count, 2190529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch EXT2_DESC_PER_BLOCK(super)); 2200529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 2210529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize; 2220529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch set_field(s_inodes_count, super->s_blocks_count / i); 2230529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 2240529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch /* 2250529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so 2260529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * that we have enough inodes for the filesystem(!) 2270529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch */ 2280529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1) 2290529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_inodes_count = EXT2_FIRST_INODE(super)+1; 2300529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 2310529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch /* 2320529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * There should be at least as many inodes as the user 2330529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * requested. Figure out how many inodes per group that 2340529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * should be. But make sure that we don't allocate more than 2350529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * one bitmap's worth of inodes each group. 2360529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch */ 2370529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count); 2380529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch if (ipg > fs->blocksize * 8) { 2390529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch if (super->s_blocks_per_group >= 256) { 2400529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch /* Try again with slightly different parameters */ 2410529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_blocks_per_group -= 8; 2420529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_blocks_count = param->s_blocks_count; 2430529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_frags_per_group = super->s_blocks_per_group * 2440529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch frags_per_block; 2450529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch goto retry; 2460529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch } else 2470529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch return EXT2_ET_TOO_MANY_INODES; 2480529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch } 2490529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 2500529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super)) 2510529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch ipg = EXT2_MAX_INODES_PER_GROUP(super); 2520529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 2530529e5d033099cbfc42635f6f6183833b09dff6eBen Murdochipg_retry: 2540529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_inodes_per_group = ipg; 2550529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch 2560529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch /* 2570529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * Make sure the number of inodes per group completely fills 2580529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * the inode table blocks in the descriptor. If not, add some 2590529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * additional inodes/group. Waste not, want not... 2600529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch */ 2610529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch fs->inode_blocks_per_group = (((super->s_inodes_per_group * 2620529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch EXT2_INODE_SIZE(super)) + 2630529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch EXT2_BLOCK_SIZE(super) - 1) / 2640529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch EXT2_BLOCK_SIZE(super)); 2650529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_inodes_per_group = ((fs->inode_blocks_per_group * 2660529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch EXT2_BLOCK_SIZE(super)) / 2670529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch EXT2_INODE_SIZE(super)); 2680529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch /* 2690529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * Finally, make sure the number of inodes per group is a 2700529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * multiple of 8. This is needed to simplify the bitmap 2710529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch * splicing code. 2720529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch */ 2730529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch super->s_inodes_per_group &= ~7; 2740529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch fs->inode_blocks_per_group = (((super->s_inodes_per_group * 2750529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch EXT2_INODE_SIZE(super)) + 276558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch EXT2_BLOCK_SIZE(super) - 1) / 277 EXT2_BLOCK_SIZE(super)); 278 279 /* 280 * adjust inode count to reflect the adjusted inodes_per_group 281 */ 282 if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) { 283 ipg--; 284 goto ipg_retry; 285 } 286 super->s_inodes_count = super->s_inodes_per_group * 287 fs->group_desc_count; 288 super->s_free_inodes_count = super->s_inodes_count; 289 290 /* 291 * check the number of reserved group descriptor table blocks 292 */ 293 if (super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE) 294 rsv_gdt = calc_reserved_gdt_blocks(fs); 295 else 296 rsv_gdt = 0; 297 set_field(s_reserved_gdt_blocks, rsv_gdt); 298 if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) { 299 retval = EXT2_ET_RES_GDT_BLOCKS; 300 goto cleanup; 301 } 302 303 /* 304 * Calculate the maximum number of bookkeeping blocks per 305 * group. It includes the superblock, the block group 306 * descriptors, the block bitmap, the inode bitmap, the inode 307 * table, and the reserved gdt blocks. 308 */ 309 overhead = (int) (3 + fs->inode_blocks_per_group + 310 fs->desc_blocks + super->s_reserved_gdt_blocks); 311 312 /* This can only happen if the user requested too many inodes */ 313 if (overhead > super->s_blocks_per_group) 314 return EXT2_ET_TOO_MANY_INODES; 315 316 /* 317 * See if the last group is big enough to support the 318 * necessary data structures. If not, we need to get rid of 319 * it. We need to recalculate the overhead for the last block 320 * group, since it might or might not have a superblock 321 * backup. 322 */ 323 overhead = (int) (2 + fs->inode_blocks_per_group); 324 if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1)) 325 overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks; 326 rem = ((super->s_blocks_count - super->s_first_data_block) % 327 super->s_blocks_per_group); 328 if ((fs->group_desc_count == 1) && rem && (rem < overhead)) 329 return EXT2_ET_TOOSMALL; 330 if (rem && (rem < overhead+50)) { 331 super->s_blocks_count -= rem; 332 goto retry; 333 } 334 335 /* 336 * At this point we know how big the filesystem will be. So 337 * we can do any and all allocations that depend on the block 338 * count. 339 */ 340 341 retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf); 342 if (retval) 343 goto cleanup; 344 345 sprintf(buf, "block bitmap for %s", fs->device_name); 346 retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map); 347 if (retval) 348 goto cleanup; 349 350 sprintf(buf, "inode bitmap for %s", fs->device_name); 351 retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map); 352 if (retval) 353 goto cleanup; 354 355 ext2fs_free_mem(&buf); 356 357 retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize, 358 &fs->group_desc); 359 if (retval) 360 goto cleanup; 361 362 memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize); 363 364 /* 365 * Reserve the superblock and group descriptors for each 366 * group, and fill in the correct group statistics for group. 367 * Note that although the block bitmap, inode bitmap, and 368 * inode table have not been allocated (and in fact won't be 369 * by this routine), they are accounted for nevertheless. 370 */ 371 super->s_free_blocks_count = 0; 372 for (i = 0; i < fs->group_desc_count; i++) { 373 numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map); 374 375 super->s_free_blocks_count += numblocks; 376 fs->group_desc[i].bg_free_blocks_count = numblocks; 377 fs->group_desc[i].bg_free_inodes_count = 378 fs->super->s_inodes_per_group; 379 fs->group_desc[i].bg_used_dirs_count = 0; 380 } 381 382 c = (char) 255; 383 if (((int) c) == -1) { 384 super->s_flags |= EXT2_FLAGS_SIGNED_HASH; 385 } else { 386 super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH; 387 } 388 389 ext2fs_mark_super_dirty(fs); 390 ext2fs_mark_bb_dirty(fs); 391 ext2fs_mark_ib_dirty(fs); 392 393 io_channel_set_blksize(fs->io, fs->blocksize); 394 395 *ret_fs = fs; 396 return 0; 397cleanup: 398 ext2fs_free(fs); 399 return retval; 400} 401