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582 lines
17 KiB
C
582 lines
17 KiB
C
/*
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* initialize.c --- initialize a filesystem handle given superblock
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* parameters. Used by mke2fs when initializing a filesystem.
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*
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* Copyright (C) 1994, 1995, 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <time.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#if defined(__linux__) && defined(EXT2_OS_LINUX)
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#define CREATOR_OS EXT2_OS_LINUX
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#else
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#if defined(__GNU__) && defined(EXT2_OS_HURD)
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#define CREATOR_OS EXT2_OS_HURD
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#else
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#if defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD)
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#define CREATOR_OS EXT2_OS_FREEBSD
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#else
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#if defined(LITES) && defined(EXT2_OS_LITES)
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#define CREATOR_OS EXT2_OS_LITES
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#else
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#define CREATOR_OS EXT2_OS_LINUX /* by default */
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#endif /* defined(LITES) && defined(EXT2_OS_LITES) */
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#endif /* defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) */
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#endif /* defined(__GNU__) && defined(EXT2_OS_HURD) */
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#endif /* defined(__linux__) && defined(EXT2_OS_LINUX) */
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/*
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* Calculate the number of GDT blocks to reserve for online filesystem growth.
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* The absolute maximum number of GDT blocks we can reserve is determined by
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* the number of block pointers that can fit into a single block.
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*/
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static unsigned int calc_reserved_gdt_blocks(ext2_filsys fs)
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{
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struct ext2_super_block *sb = fs->super;
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unsigned long bpg = sb->s_blocks_per_group;
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unsigned int gdpb = EXT2_DESC_PER_BLOCK(sb);
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unsigned long max_blocks = 0xffffffff;
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unsigned long rsv_groups;
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unsigned int rsv_gdb;
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/* We set it at 1024x the current filesystem size, or
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* the upper block count limit (2^32), whichever is lower.
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*/
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if (ext2fs_blocks_count(sb) < max_blocks / 1024)
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max_blocks = ext2fs_blocks_count(sb) * 1024;
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/*
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* ext2fs_div64_ceil() is unnecessary because max_blocks is
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* max _GDT_ blocks, which is limited to 32 bits.
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*/
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rsv_groups = ext2fs_div_ceil(max_blocks - sb->s_first_data_block, bpg);
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rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) - fs->desc_blocks;
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if (rsv_gdb > EXT2_ADDR_PER_BLOCK(sb))
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rsv_gdb = EXT2_ADDR_PER_BLOCK(sb);
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#ifdef RES_GDT_DEBUG
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printf("max_blocks %lu, rsv_groups = %lu, rsv_gdb = %u\n",
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max_blocks, rsv_groups, rsv_gdb);
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#endif
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return rsv_gdb;
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}
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errcode_t ext2fs_initialize(const char *name, int flags,
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struct ext2_super_block *param,
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io_manager manager, ext2_filsys *ret_fs)
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{
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ext2_filsys fs;
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errcode_t retval;
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struct ext2_super_block *super;
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unsigned int rem;
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unsigned int overhead = 0;
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unsigned int ipg;
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dgrp_t i;
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blk64_t free_blocks;
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blk_t numblocks;
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int rsv_gdt;
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int csum_flag;
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int bigalloc_flag;
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int io_flags;
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int has_bg;
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unsigned reserved_inos;
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char *buf = 0;
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char c;
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double reserved_ratio;
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char *time_env;
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if (!param || !ext2fs_blocks_count(param))
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return EXT2_ET_INVALID_ARGUMENT;
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retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
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if (retval)
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return retval;
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memset(fs, 0, sizeof(struct struct_ext2_filsys));
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fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
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fs->flags = flags | EXT2_FLAG_RW;
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fs->umask = 022;
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fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
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#ifdef WORDS_BIGENDIAN
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fs->flags |= EXT2_FLAG_SWAP_BYTES;
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#endif
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time_env = getenv("E2FSPROGS_FAKE_TIME");
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if (time_env)
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fs->now = strtoul(time_env, NULL, 0);
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io_flags = IO_FLAG_RW;
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if (flags & EXT2_FLAG_EXCLUSIVE)
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io_flags |= IO_FLAG_EXCLUSIVE;
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if (flags & EXT2_FLAG_DIRECT_IO)
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io_flags |= IO_FLAG_DIRECT_IO;
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io_flags |= O_BINARY;
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retval = manager->open(name, io_flags, &fs->io);
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if (retval)
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goto cleanup;
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fs->image_io = fs->io;
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fs->io->app_data = fs;
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retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
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if (retval)
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goto cleanup;
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strcpy(fs->device_name, name);
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retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
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if (retval)
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goto cleanup;
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fs->super = super;
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memset(super, 0, SUPERBLOCK_SIZE);
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#define set_field(field, default) (super->field = param->field ? \
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param->field : (default))
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#define assign_field(field) (super->field = param->field)
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super->s_magic = EXT2_SUPER_MAGIC;
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super->s_state = EXT2_VALID_FS;
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bigalloc_flag = ext2fs_has_feature_bigalloc(param);
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assign_field(s_log_block_size);
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if (bigalloc_flag) {
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set_field(s_log_cluster_size, super->s_log_block_size+4);
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if (super->s_log_block_size > super->s_log_cluster_size) {
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retval = EXT2_ET_INVALID_ARGUMENT;
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goto cleanup;
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}
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} else
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super->s_log_cluster_size = super->s_log_block_size;
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set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1);
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set_field(s_max_mnt_count, 0);
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set_field(s_errors, EXT2_ERRORS_DEFAULT);
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set_field(s_feature_compat, 0);
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set_field(s_feature_incompat, 0);
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set_field(s_feature_ro_compat, 0);
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set_field(s_default_mount_opts, 0);
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set_field(s_first_meta_bg, 0);
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set_field(s_raid_stride, 0); /* default stride size: 0 */
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set_field(s_raid_stripe_width, 0); /* default stripe width: 0 */
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set_field(s_log_groups_per_flex, 0);
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set_field(s_flags, 0);
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assign_field(s_backup_bgs[0]);
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assign_field(s_backup_bgs[1]);
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assign_field(s_encoding);
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assign_field(s_encoding_flags);
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// if (ext2fs_has_feature_casefold(param))
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// fs->encoding = ext2fs_load_nls_table(param->s_encoding);
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if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
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retval = EXT2_ET_UNSUPP_FEATURE;
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goto cleanup;
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}
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if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
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retval = EXT2_ET_RO_UNSUPP_FEATURE;
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goto cleanup;
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}
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set_field(s_rev_level, EXT2_GOOD_OLD_REV);
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if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
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set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
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set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
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if (super->s_inode_size >= sizeof(struct ext2_inode_large)) {
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int extra_isize = sizeof(struct ext2_inode_large) -
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EXT2_GOOD_OLD_INODE_SIZE;
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set_field(s_min_extra_isize, extra_isize);
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set_field(s_want_extra_isize, extra_isize);
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}
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} else {
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super->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
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super->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
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}
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set_field(s_checkinterval, 0);
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super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);
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super->s_creator_os = CREATOR_OS;
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fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(super);
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fs->cluster_ratio_bits = super->s_log_cluster_size -
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super->s_log_block_size;
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if (bigalloc_flag) {
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unsigned long long bpg;
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if (param->s_blocks_per_group &&
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param->s_clusters_per_group &&
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((param->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs)) !=
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param->s_blocks_per_group)) {
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retval = EXT2_ET_INVALID_ARGUMENT;
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goto cleanup;
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}
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if (param->s_clusters_per_group)
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assign_field(s_clusters_per_group);
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else if (param->s_blocks_per_group)
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super->s_clusters_per_group =
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param->s_blocks_per_group /
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EXT2FS_CLUSTER_RATIO(fs);
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else if (super->s_log_cluster_size + 15 < 32)
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super->s_clusters_per_group = fs->blocksize * 8;
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else
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super->s_clusters_per_group = (fs->blocksize - 1) * 8;
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if (super->s_clusters_per_group > EXT2_MAX_CLUSTERS_PER_GROUP(super))
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super->s_clusters_per_group = EXT2_MAX_CLUSTERS_PER_GROUP(super);
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bpg = EXT2FS_C2B(fs,
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(unsigned long long) super->s_clusters_per_group);
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if (bpg >= (((unsigned long long) 1) << 32)) {
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retval = EXT2_ET_INVALID_ARGUMENT;
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goto cleanup;
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}
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super->s_blocks_per_group = bpg;
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} else {
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set_field(s_blocks_per_group, fs->blocksize * 8);
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if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
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super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
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super->s_clusters_per_group = super->s_blocks_per_group;
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}
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ext2fs_blocks_count_set(super, ext2fs_blocks_count(param) &
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~((blk64_t) EXT2FS_CLUSTER_MASK(fs)));
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ext2fs_r_blocks_count_set(super, ext2fs_r_blocks_count(param));
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if (ext2fs_r_blocks_count(super) >= ext2fs_blocks_count(param)) {
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retval = EXT2_ET_INVALID_ARGUMENT;
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goto cleanup;
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}
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set_field(s_mmp_update_interval, 0);
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/*
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* If we're creating an external journal device, we don't need
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* to bother with the rest.
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*/
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if (ext2fs_has_feature_journal_dev(super)) {
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fs->group_desc_count = 0;
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ext2fs_mark_super_dirty(fs);
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*ret_fs = fs;
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return 0;
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}
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retry:
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fs->group_desc_count = (dgrp_t) ext2fs_div64_ceil(
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ext2fs_blocks_count(super) - super->s_first_data_block,
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EXT2_BLOCKS_PER_GROUP(super));
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if (fs->group_desc_count == 0) {
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retval = EXT2_ET_TOOSMALL;
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goto cleanup;
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}
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set_field(s_desc_size,
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ext2fs_has_feature_64bit(super) ?
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EXT2_MIN_DESC_SIZE_64BIT : 0);
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if (EXT2_DESC_SIZE(super) == 0) {
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retval = EXT2_ET_UNEXPECTED_BLOCK_SIZE;
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goto cleanup;
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}
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fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
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EXT2_DESC_PER_BLOCK(super));
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i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
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if (ext2fs_has_feature_64bit(super) &&
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(ext2fs_blocks_count(super) / i) >= (1ULL << 32))
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set_field(s_inodes_count, ~0U);
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else
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set_field(s_inodes_count, ext2fs_blocks_count(super) / i);
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/*
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* Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
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* that we have enough inodes for the filesystem(!)
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*/
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if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
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super->s_inodes_count = EXT2_FIRST_INODE(super)+1;
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/*
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* There should be at least as many inodes as the user
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* requested. Figure out how many inodes per group that
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* should be. But make sure that we don't allocate more than
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* one bitmap's worth of inodes each group.
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*/
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ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
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if (ipg > fs->blocksize * 8) {
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if (!bigalloc_flag && super->s_blocks_per_group >= 256) {
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/* Try again with slightly different parameters */
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super->s_blocks_per_group -= 8;
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ext2fs_blocks_count_set(super,
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ext2fs_blocks_count(param));
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super->s_clusters_per_group = super->s_blocks_per_group;
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goto retry;
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} else {
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retval = EXT2_ET_TOO_MANY_INODES;
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goto cleanup;
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}
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}
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if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
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ipg = EXT2_MAX_INODES_PER_GROUP(super);
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ipg_retry:
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super->s_inodes_per_group = ipg;
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/*
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* Make sure the number of inodes per group completely fills
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* the inode table blocks in the descriptor. If not, add some
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* additional inodes/group. Waste not, want not...
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*/
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fs->inode_blocks_per_group = (((super->s_inodes_per_group *
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EXT2_INODE_SIZE(super)) +
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EXT2_BLOCK_SIZE(super) - 1) /
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EXT2_BLOCK_SIZE(super));
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super->s_inodes_per_group = ((fs->inode_blocks_per_group *
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EXT2_BLOCK_SIZE(super)) /
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EXT2_INODE_SIZE(super));
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/*
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* Finally, make sure the number of inodes per group is a
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* multiple of 8. This is needed to simplify the bitmap
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* splicing code.
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*/
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if (super->s_inodes_per_group < 8)
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super->s_inodes_per_group = 8;
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super->s_inodes_per_group &= ~7;
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fs->inode_blocks_per_group = (((super->s_inodes_per_group *
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EXT2_INODE_SIZE(super)) +
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EXT2_BLOCK_SIZE(super) - 1) /
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EXT2_BLOCK_SIZE(super));
|
|
|
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/*
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* adjust inode count to reflect the adjusted inodes_per_group
|
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*/
|
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if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
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ipg--;
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goto ipg_retry;
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}
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super->s_inodes_count = super->s_inodes_per_group *
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fs->group_desc_count;
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super->s_free_inodes_count = super->s_inodes_count;
|
|
|
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/*
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* check the number of reserved group descriptor table blocks
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*/
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if (ext2fs_has_feature_resize_inode(super))
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rsv_gdt = calc_reserved_gdt_blocks(fs);
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else
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rsv_gdt = 0;
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set_field(s_reserved_gdt_blocks, rsv_gdt);
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if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
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retval = EXT2_ET_RES_GDT_BLOCKS;
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goto cleanup;
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}
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/* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
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if (super->s_reserved_gdt_blocks + fs->desc_blocks >
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super->s_blocks_per_group * 3 / 4) {
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ext2fs_set_feature_meta_bg(fs->super);
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ext2fs_clear_feature_resize_inode(fs->super);
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set_field(s_reserved_gdt_blocks, 0);
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}
|
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|
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/*
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* Calculate the maximum number of bookkeeping blocks per
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* group. It includes the superblock, the block group
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* descriptors, the block bitmap, the inode bitmap, the inode
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|
* table, and the reserved gdt blocks.
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*/
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overhead = (int) (3 + fs->inode_blocks_per_group +
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super->s_reserved_gdt_blocks);
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|
|
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if (ext2fs_has_feature_meta_bg(fs->super))
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overhead++;
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else
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overhead += fs->desc_blocks;
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|
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/* This can only happen if the user requested too many inodes */
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if (overhead > super->s_blocks_per_group) {
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retval = EXT2_ET_TOO_MANY_INODES;
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goto cleanup;
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}
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|
|
/*
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* See if the last group is big enough to support the
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* necessary data structures. If not, we need to get rid of
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* it. We need to recalculate the overhead for the last block
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* group, since it might or might not have a superblock
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* backup.
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*/
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overhead = (int) (2 + fs->inode_blocks_per_group);
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has_bg = 0;
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|
if (ext2fs_has_feature_sparse_super2(super)) {
|
|
/*
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* We have to do this manually since
|
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* super->s_backup_bgs hasn't been set up yet.
|
|
*/
|
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if (fs->group_desc_count == 2)
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has_bg = param->s_backup_bgs[0] != 0;
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else
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has_bg = param->s_backup_bgs[1] != 0;
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} else
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has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
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if (has_bg)
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overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;
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rem = ((ext2fs_blocks_count(super) - super->s_first_data_block) %
|
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super->s_blocks_per_group);
|
|
if ((fs->group_desc_count == 1) && rem && (rem < overhead)) {
|
|
retval = EXT2_ET_TOOSMALL;
|
|
goto cleanup;
|
|
}
|
|
if (rem && (rem < overhead+50)) {
|
|
ext2fs_blocks_count_set(super, ext2fs_blocks_count(super) -
|
|
rem);
|
|
/*
|
|
* If blocks count is changed, we need to recalculate
|
|
* reserved blocks count not to exceed 50%.
|
|
*/
|
|
reserved_ratio = 100.0 * ext2fs_r_blocks_count(param) /
|
|
ext2fs_blocks_count(param);
|
|
ext2fs_r_blocks_count_set(super, reserved_ratio *
|
|
ext2fs_blocks_count(super) / 100.0);
|
|
|
|
goto retry;
|
|
}
|
|
|
|
/*
|
|
* At this point we know how big the filesystem will be. So
|
|
* we can do any and all allocations that depend on the block
|
|
* count.
|
|
*/
|
|
|
|
/* Set up the locations of the backup superblocks */
|
|
if (ext2fs_has_feature_sparse_super2(super)) {
|
|
if (super->s_backup_bgs[0] >= fs->group_desc_count)
|
|
super->s_backup_bgs[0] = fs->group_desc_count - 1;
|
|
if (super->s_backup_bgs[1] >= fs->group_desc_count)
|
|
super->s_backup_bgs[1] = fs->group_desc_count - 1;
|
|
if (super->s_backup_bgs[0] == super->s_backup_bgs[1])
|
|
super->s_backup_bgs[1] = 0;
|
|
if (super->s_backup_bgs[0] > super->s_backup_bgs[1]) {
|
|
__u32 t = super->s_backup_bgs[0];
|
|
super->s_backup_bgs[0] = super->s_backup_bgs[1];
|
|
super->s_backup_bgs[1] = t;
|
|
}
|
|
}
|
|
|
|
retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
|
|
if (retval)
|
|
goto cleanup;
|
|
|
|
strcpy(buf, "block bitmap for ");
|
|
strcat(buf, fs->device_name);
|
|
retval = ext2fs_allocate_subcluster_bitmap(fs, buf, &fs->block_map);
|
|
if (retval)
|
|
goto cleanup;
|
|
|
|
strcpy(buf, "inode bitmap for ");
|
|
strcat(buf, fs->device_name);
|
|
retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
|
|
if (retval)
|
|
goto cleanup;
|
|
|
|
ext2fs_free_mem(&buf);
|
|
|
|
retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
|
|
&fs->group_desc);
|
|
if (retval)
|
|
goto cleanup;
|
|
|
|
memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);
|
|
|
|
/*
|
|
* Reserve the superblock and group descriptors for each
|
|
* group, and fill in the correct group statistics for group.
|
|
* Note that although the block bitmap, inode bitmap, and
|
|
* inode table have not been allocated (and in fact won't be
|
|
* by this routine), they are accounted for nevertheless.
|
|
*
|
|
* If FLEX_BG meta-data grouping is used, only account for the
|
|
* superblock and group descriptors (the inode tables and
|
|
* bitmaps will be accounted for when allocated).
|
|
*/
|
|
free_blocks = 0;
|
|
csum_flag = ext2fs_has_group_desc_csum(fs);
|
|
reserved_inos = super->s_first_ino;
|
|
for (i = 0; i < fs->group_desc_count; i++) {
|
|
/*
|
|
* Don't set the BLOCK_UNINIT group for the last group
|
|
* because the block bitmap needs to be padded.
|
|
*/
|
|
if (csum_flag) {
|
|
if (i != fs->group_desc_count - 1)
|
|
ext2fs_bg_flags_set(fs, i,
|
|
EXT2_BG_BLOCK_UNINIT);
|
|
ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
|
|
numblocks = super->s_inodes_per_group;
|
|
if (reserved_inos) {
|
|
if (numblocks > reserved_inos) {
|
|
numblocks -= reserved_inos;
|
|
reserved_inos = 0;
|
|
} else {
|
|
reserved_inos -= numblocks;
|
|
numblocks = 0;
|
|
}
|
|
}
|
|
ext2fs_bg_itable_unused_set(fs, i, numblocks);
|
|
}
|
|
numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
|
|
if (fs->super->s_log_groups_per_flex)
|
|
numblocks += 2 + fs->inode_blocks_per_group;
|
|
|
|
free_blocks += numblocks;
|
|
ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
|
|
ext2fs_bg_free_inodes_count_set(fs, i, fs->super->s_inodes_per_group);
|
|
ext2fs_bg_used_dirs_count_set(fs, i, 0);
|
|
ext2fs_group_desc_csum_set(fs, i);
|
|
}
|
|
free_blocks &= ~EXT2FS_CLUSTER_MASK(fs);
|
|
ext2fs_free_blocks_count_set(super, free_blocks);
|
|
|
|
c = (char) 255;
|
|
// coverity[dead_error_condition]
|
|
if (((int) c) == -1) {
|
|
super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
|
|
} else {
|
|
super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
|
|
}
|
|
|
|
ext2fs_mark_super_dirty(fs);
|
|
ext2fs_mark_bb_dirty(fs);
|
|
ext2fs_mark_ib_dirty(fs);
|
|
|
|
io_channel_set_blksize(fs->io, fs->blocksize);
|
|
|
|
*ret_fs = fs;
|
|
return 0;
|
|
cleanup:
|
|
free(buf);
|
|
ext2fs_free(fs);
|
|
return retval;
|
|
}
|