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565 lines
16 KiB
565 lines
16 KiB
/*
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* openfs.c --- open an ext2 filesystem
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*
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* Copyright (C) 1993, 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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#ifdef HAVE_ERRNO_H
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#include <errno.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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#include "e2image.h"
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blk64_t ext2fs_descriptor_block_loc2(ext2_filsys fs, blk64_t group_block,
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dgrp_t i)
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{
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int bg;
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int has_super = 0, group_zero_adjust = 0;
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blk64_t ret_blk;
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/*
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* On a bigalloc FS with 1K blocks, block 0 is reserved for non-ext4
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* stuff, so adjust for that if we're being asked for group 0.
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*/
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if (i == 0 && fs->blocksize == 1024 && EXT2FS_CLUSTER_RATIO(fs) > 1)
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group_zero_adjust = 1;
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if (!ext2fs_has_feature_meta_bg(fs->super) ||
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(i < fs->super->s_first_meta_bg))
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return group_block + i + 1 + group_zero_adjust;
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bg = EXT2_DESC_PER_BLOCK(fs->super) * i;
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if (ext2fs_bg_has_super(fs, bg))
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has_super = 1;
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ret_blk = ext2fs_group_first_block2(fs, bg);
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/*
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* If group_block is not the normal value, we're trying to use
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* the backup group descriptors and superblock --- so use the
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* alternate location of the second block group in the
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* metablock group. Ideally we should be testing each bg
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* descriptor block individually for correctness, but we don't
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* have the infrastructure in place to do that.
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*/
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if (group_block != fs->super->s_first_data_block &&
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((ret_blk + has_super + fs->super->s_blocks_per_group) <
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ext2fs_blocks_count(fs->super))) {
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ret_blk += fs->super->s_blocks_per_group;
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/*
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* If we're going to jump forward a block group, make sure
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* that we adjust has_super to account for the next group's
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* backup superblock (or lack thereof).
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*/
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if (ext2fs_bg_has_super(fs, bg + 1))
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has_super = 1;
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else
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has_super = 0;
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}
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return ret_blk + has_super + group_zero_adjust;
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}
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blk_t ext2fs_descriptor_block_loc(ext2_filsys fs, blk_t group_block, dgrp_t i)
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{
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return ext2fs_descriptor_block_loc2(fs, group_block, i);
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}
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errcode_t ext2fs_open(const char *name, int flags, int superblock,
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unsigned int block_size, io_manager manager,
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ext2_filsys *ret_fs)
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{
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return ext2fs_open2(name, 0, flags, superblock, block_size,
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manager, ret_fs);
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}
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static void block_sha_map_free_entry(void *data)
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{
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free(data);
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return;
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}
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/*
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* Note: if superblock is non-zero, block-size must also be non-zero.
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* Superblock and block_size can be zero to use the default size.
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*
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* Valid flags for ext2fs_open()
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*
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* EXT2_FLAG_RW - Open the filesystem for read/write.
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* EXT2_FLAG_FORCE - Open the filesystem even if some of the
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* features aren't supported.
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* EXT2_FLAG_JOURNAL_DEV_OK - Open an ext3 journal device
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* EXT2_FLAG_SKIP_MMP - Open without multi-mount protection check.
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* EXT2_FLAG_64BITS - Allow 64-bit bitfields (needed for large
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* filesystems)
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*/
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errcode_t ext2fs_open2(const char *name, const char *io_options,
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int flags, int superblock,
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unsigned int block_size, io_manager manager,
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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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unsigned long i, first_meta_bg;
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__u32 features;
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unsigned int blocks_per_group, io_flags;
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blk64_t group_block, blk;
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char *dest, *cp;
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int group_zero_adjust = 0;
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unsigned int inode_size;
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__u64 groups_cnt;
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#ifdef WORDS_BIGENDIAN
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unsigned int groups_per_block;
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struct ext2_group_desc *gdp;
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int j;
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#endif
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char *time_env;
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EXT2_CHECK_MAGIC(manager, EXT2_ET_MAGIC_IO_MANAGER);
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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;
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/* don't overwrite sb backups unless flag is explicitly cleared */
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fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
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fs->umask = 022;
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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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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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cp = strchr(fs->device_name, '?');
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if (!io_options && cp) {
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*cp++ = 0;
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io_options = cp;
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}
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io_flags = 0;
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if (flags & EXT2_FLAG_RW)
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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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retval = manager->open(fs->device_name, io_flags, &fs->io);
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if (retval)
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goto cleanup;
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if (io_options &&
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(retval = io_channel_set_options(fs->io, io_options)))
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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 = io_channel_alloc_buf(fs->io, -SUPERBLOCK_SIZE, &fs->super);
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if (retval)
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goto cleanup;
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if (flags & EXT2_FLAG_IMAGE_FILE) {
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retval = ext2fs_get_mem(sizeof(struct ext2_image_hdr),
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&fs->image_header);
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if (retval)
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goto cleanup;
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retval = io_channel_read_blk(fs->io, 0,
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-(int)sizeof(struct ext2_image_hdr),
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fs->image_header);
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if (retval)
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goto cleanup;
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if (ext2fs_le32_to_cpu(fs->image_header->magic_number) != EXT2_ET_MAGIC_E2IMAGE)
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return EXT2_ET_MAGIC_E2IMAGE;
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superblock = 1;
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block_size = ext2fs_le32_to_cpu(fs->image_header->fs_blocksize);
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}
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/*
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* If the user specifies a specific block # for the
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* superblock, then he/she must also specify the block size!
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* Otherwise, read the master superblock located at offset
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* SUPERBLOCK_OFFSET from the start of the partition.
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*
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* Note: we only save a backup copy of the superblock if we
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* are reading the superblock from the primary superblock location.
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*/
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if (superblock) {
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if (!block_size) {
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retval = EXT2_ET_INVALID_ARGUMENT;
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goto cleanup;
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}
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io_channel_set_blksize(fs->io, block_size);
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group_block = superblock;
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fs->orig_super = 0;
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} else {
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io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET);
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superblock = 1;
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group_block = 0;
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retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
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if (retval)
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goto cleanup;
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}
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retval = io_channel_read_blk(fs->io, superblock, -SUPERBLOCK_SIZE,
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fs->super);
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if (retval)
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goto cleanup;
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if (fs->orig_super)
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memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE);
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if (!(fs->flags & EXT2_FLAG_IGNORE_CSUM_ERRORS)) {
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retval = 0;
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if (!ext2fs_verify_csum_type(fs, fs->super))
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retval = EXT2_ET_UNKNOWN_CSUM;
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if (!ext2fs_superblock_csum_verify(fs, fs->super))
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retval = EXT2_ET_SB_CSUM_INVALID;
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}
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#ifdef WORDS_BIGENDIAN
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fs->flags |= EXT2_FLAG_SWAP_BYTES;
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ext2fs_swap_super(fs->super);
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#else
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if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
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retval = EXT2_ET_UNIMPLEMENTED;
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goto cleanup;
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}
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#endif
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if (fs->super->s_magic != EXT2_SUPER_MAGIC)
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retval = EXT2_ET_BAD_MAGIC;
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if (retval)
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goto cleanup;
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if (fs->super->s_rev_level > EXT2_LIB_CURRENT_REV) {
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retval = EXT2_ET_REV_TOO_HIGH;
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goto cleanup;
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}
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/*
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* Check for feature set incompatibility
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*/
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if (!(flags & EXT2_FLAG_FORCE)) {
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features = fs->super->s_feature_incompat;
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#ifdef EXT2_LIB_SOFTSUPP_INCOMPAT
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if (flags & EXT2_FLAG_SOFTSUPP_FEATURES)
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features &= ~EXT2_LIB_SOFTSUPP_INCOMPAT;
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#endif
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if (features & ~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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features = fs->super->s_feature_ro_compat;
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#ifdef EXT2_LIB_SOFTSUPP_RO_COMPAT
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if (flags & EXT2_FLAG_SOFTSUPP_FEATURES)
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features &= ~EXT2_LIB_SOFTSUPP_RO_COMPAT;
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#endif
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if ((flags & EXT2_FLAG_RW) &&
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(features & ~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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if (!(flags & EXT2_FLAG_JOURNAL_DEV_OK) &&
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ext2fs_has_feature_journal_dev(fs->super)) {
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retval = EXT2_ET_UNSUPP_FEATURE;
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goto cleanup;
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}
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}
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if (fs->super->s_log_block_size >
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(unsigned) (EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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goto cleanup;
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}
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/*
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* bigalloc requires cluster-aware bitfield operations, which at the
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* moment means we need EXT2_FLAG_64BITS.
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*/
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if (ext2fs_has_feature_bigalloc(fs->super) &&
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!(flags & EXT2_FLAG_64BITS)) {
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retval = EXT2_ET_CANT_USE_LEGACY_BITMAPS;
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goto cleanup;
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}
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if (!ext2fs_has_feature_bigalloc(fs->super) &&
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(fs->super->s_log_block_size != fs->super->s_log_cluster_size)) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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goto cleanup;
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}
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fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(fs->super);
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inode_size = EXT2_INODE_SIZE(fs->super);
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if ((inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
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(inode_size > fs->blocksize) ||
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(inode_size & (inode_size - 1))) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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goto cleanup;
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}
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/* Enforce the block group descriptor size */
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if (ext2fs_has_feature_64bit(fs->super)) {
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if (fs->super->s_desc_size < EXT2_MIN_DESC_SIZE_64BIT) {
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retval = EXT2_ET_BAD_DESC_SIZE;
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goto cleanup;
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}
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}
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fs->cluster_ratio_bits = fs->super->s_log_cluster_size -
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fs->super->s_log_block_size;
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if (EXT2_BLOCKS_PER_GROUP(fs->super) !=
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EXT2_CLUSTERS_PER_GROUP(fs->super) << fs->cluster_ratio_bits) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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goto cleanup;
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}
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fs->inode_blocks_per_group = ((EXT2_INODES_PER_GROUP(fs->super) *
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EXT2_INODE_SIZE(fs->super) +
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EXT2_BLOCK_SIZE(fs->super) - 1) /
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EXT2_BLOCK_SIZE(fs->super));
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if (block_size) {
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if (block_size != fs->blocksize) {
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retval = EXT2_ET_UNEXPECTED_BLOCK_SIZE;
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goto cleanup;
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}
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}
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/*
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* Set the blocksize to the filesystem's blocksize.
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*/
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io_channel_set_blksize(fs->io, fs->blocksize);
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/*
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* If this is an external journal device, don't try to read
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* the group descriptors, because they're not there.
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*/
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if (ext2fs_has_feature_journal_dev(fs->super)) {
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fs->group_desc_count = 0;
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*ret_fs = fs;
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return 0;
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}
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if (EXT2_INODES_PER_GROUP(fs->super) == 0) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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goto cleanup;
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}
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/* Precompute the FS UUID to seed other checksums */
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ext2fs_init_csum_seed(fs);
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/*
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* Read group descriptors
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*/
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blocks_per_group = EXT2_BLOCKS_PER_GROUP(fs->super);
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if (blocks_per_group == 0 ||
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blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(fs->super) ||
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fs->inode_blocks_per_group > EXT2_MAX_INODES_PER_GROUP(fs->super) ||
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EXT2_DESC_PER_BLOCK(fs->super) == 0 ||
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fs->super->s_first_data_block >= ext2fs_blocks_count(fs->super)) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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goto cleanup;
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}
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groups_cnt = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
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fs->super->s_first_data_block,
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blocks_per_group);
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if (groups_cnt >> 32) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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goto cleanup;
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}
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fs->group_desc_count = groups_cnt;
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if (!(flags & EXT2_FLAG_IGNORE_SB_ERRORS) &&
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(__u64)fs->group_desc_count * EXT2_INODES_PER_GROUP(fs->super) !=
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fs->super->s_inodes_count) {
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retval = EXT2_ET_CORRUPT_SUPERBLOCK;
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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(fs->super));
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retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
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&fs->group_desc);
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if (retval)
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goto cleanup;
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if (!group_block)
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group_block = fs->super->s_first_data_block;
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/*
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* On a FS with a 1K blocksize, block 0 is reserved for bootloaders
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* so we must increment block numbers to any group 0 items.
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*
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* However, we cannot touch group_block directly because in the meta_bg
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* case, the ext2fs_descriptor_block_loc2() function will interpret
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* group_block != s_first_data_block to mean that we want to access the
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* backup group descriptors. This is not what we want if the caller
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* set superblock == 0 (i.e. auto-detect the superblock), which is
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* what's going on here.
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*/
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if (group_block == 0 && fs->blocksize == 1024)
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group_zero_adjust = 1;
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dest = (char *) fs->group_desc;
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#ifdef WORDS_BIGENDIAN
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groups_per_block = EXT2_DESC_PER_BLOCK(fs->super);
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#endif
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if (ext2fs_has_feature_meta_bg(fs->super) &&
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!(flags & EXT2_FLAG_IMAGE_FILE)) {
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first_meta_bg = fs->super->s_first_meta_bg;
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if (first_meta_bg > fs->desc_blocks)
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first_meta_bg = fs->desc_blocks;
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} else
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first_meta_bg = fs->desc_blocks;
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if (first_meta_bg) {
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retval = io_channel_read_blk(fs->io, group_block +
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group_zero_adjust + 1,
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first_meta_bg, dest);
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if (retval)
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goto cleanup;
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#ifdef WORDS_BIGENDIAN
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gdp = (struct ext2_group_desc *) dest;
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for (j=0; j < groups_per_block*first_meta_bg; j++) {
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gdp = ext2fs_group_desc(fs, fs->group_desc, j);
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ext2fs_swap_group_desc2(fs, gdp);
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}
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#endif
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dest += fs->blocksize*first_meta_bg;
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}
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for (i = first_meta_bg ; i < fs->desc_blocks; i++) {
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blk = ext2fs_descriptor_block_loc2(fs, group_block, i);
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io_channel_cache_readahead(fs->io, blk, 1);
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}
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for (i=first_meta_bg ; i < fs->desc_blocks; i++) {
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blk = ext2fs_descriptor_block_loc2(fs, group_block, i);
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retval = io_channel_read_blk64(fs->io, blk, 1, dest);
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if (retval)
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goto cleanup;
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#ifdef WORDS_BIGENDIAN
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for (j=0; j < groups_per_block; j++) {
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gdp = ext2fs_group_desc(fs, fs->group_desc,
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i * groups_per_block + j);
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ext2fs_swap_group_desc2(fs, gdp);
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}
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#endif
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dest += fs->blocksize;
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}
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fs->stride = fs->super->s_raid_stride;
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|
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/*
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* If recovery is from backup superblock, Clear _UNININT flags &
|
|
* reset bg_itable_unused to zero
|
|
*/
|
|
if (superblock > 1 && ext2fs_has_group_desc_csum(fs)) {
|
|
dgrp_t group;
|
|
|
|
for (group = 0; group < fs->group_desc_count; group++) {
|
|
ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
|
|
ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
|
|
ext2fs_bg_itable_unused_set(fs, group, 0);
|
|
/* The checksum will be reset later, but fix it here
|
|
* anyway to avoid printing a lot of spurious errors. */
|
|
ext2fs_group_desc_csum_set(fs, group);
|
|
}
|
|
if (fs->flags & EXT2_FLAG_RW)
|
|
ext2fs_mark_super_dirty(fs);
|
|
}
|
|
|
|
if (ext2fs_has_feature_mmp(fs->super) &&
|
|
!(flags & EXT2_FLAG_SKIP_MMP) &&
|
|
(flags & (EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE))) {
|
|
retval = ext2fs_mmp_start(fs);
|
|
if (retval) {
|
|
fs->flags |= EXT2_FLAG_SKIP_MMP; /* just do cleanup */
|
|
ext2fs_mmp_stop(fs);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
if (fs->flags & EXT2_FLAG_SHARE_DUP) {
|
|
fs->block_sha_map = ext2fs_hashmap_create(ext2fs_djb2_hash,
|
|
block_sha_map_free_entry, 4096);
|
|
if (!fs->block_sha_map) {
|
|
retval = EXT2_ET_NO_MEMORY;
|
|
goto cleanup;
|
|
}
|
|
ext2fs_set_feature_shared_blocks(fs->super);
|
|
}
|
|
|
|
if (ext2fs_has_feature_casefold(fs->super))
|
|
fs->encoding = ext2fs_load_nls_table(fs->super->s_encoding);
|
|
|
|
fs->flags &= ~EXT2_FLAG_NOFREE_ON_ERROR;
|
|
*ret_fs = fs;
|
|
|
|
return 0;
|
|
cleanup:
|
|
if (!(flags & EXT2_FLAG_NOFREE_ON_ERROR)) {
|
|
ext2fs_free(fs);
|
|
fs = NULL;
|
|
}
|
|
*ret_fs = fs;
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Set/get the filesystem data I/O channel.
|
|
*
|
|
* These functions are only valid if EXT2_FLAG_IMAGE_FILE is true.
|
|
*/
|
|
errcode_t ext2fs_get_data_io(ext2_filsys fs, io_channel *old_io)
|
|
{
|
|
if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
|
|
return EXT2_ET_NOT_IMAGE_FILE;
|
|
if (old_io) {
|
|
*old_io = (fs->image_io == fs->io) ? 0 : fs->io;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
errcode_t ext2fs_set_data_io(ext2_filsys fs, io_channel new_io)
|
|
{
|
|
if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
|
|
return EXT2_ET_NOT_IMAGE_FILE;
|
|
fs->io = new_io ? new_io : fs->image_io;
|
|
return 0;
|
|
}
|
|
|
|
errcode_t ext2fs_rewrite_to_io(ext2_filsys fs, io_channel new_io)
|
|
{
|
|
errcode_t err;
|
|
|
|
if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
|
|
return EXT2_ET_NOT_IMAGE_FILE;
|
|
err = io_channel_set_blksize(new_io, fs->blocksize);
|
|
if (err)
|
|
return err;
|
|
if ((new_io == fs->image_io) || (new_io == fs->io))
|
|
return 0;
|
|
if ((fs->image_io != fs->io) &&
|
|
fs->image_io)
|
|
io_channel_close(fs->image_io);
|
|
if (fs->io)
|
|
io_channel_close(fs->io);
|
|
fs->io = fs->image_io = new_io;
|
|
fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_RW |
|
|
EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;
|
|
fs->flags &= ~EXT2_FLAG_IMAGE_FILE;
|
|
return 0;
|
|
}
|