522 lines
13 KiB
C
522 lines
13 KiB
C
/*
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* closefs.c --- close 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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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <time.h>
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#include <string.h>
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#include "ext2_fs.h"
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#include "ext2fsP.h"
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static int test_root(unsigned int a, unsigned int b)
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{
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while (1) {
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if (a < b)
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return 0;
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if (a == b)
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return 1;
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if (a % b)
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return 0;
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a = a / b;
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}
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}
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int ext2fs_bg_has_super(ext2_filsys fs, dgrp_t group)
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{
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if (group == 0)
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return 1;
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if (ext2fs_has_feature_sparse_super2(fs->super)) {
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if (group == fs->super->s_backup_bgs[0] ||
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group == fs->super->s_backup_bgs[1])
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return 1;
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return 0;
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}
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if ((group <= 1) || !ext2fs_has_feature_sparse_super(fs->super))
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return 1;
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if (!(group & 1))
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return 0;
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if (test_root(group, 3) || (test_root(group, 5)) ||
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test_root(group, 7))
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return 1;
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return 0;
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}
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/*
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* ext2fs_super_and_bgd_loc2()
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* @fs: ext2 fs pointer
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* @group given block group
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* @ret_super_blk: if !NULL, returns super block location
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* @ret_old_desc_blk: if !NULL, returns location of the old block
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* group descriptor
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* @ret_new_desc_blk: if !NULL, returns location of meta_bg block
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* group descriptor
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* @ret_used_blks: if !NULL, returns number of blocks used by
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* super block and group_descriptors.
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*
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* Returns errcode_t of 0
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*/
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errcode_t ext2fs_super_and_bgd_loc2(ext2_filsys fs,
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dgrp_t group,
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blk64_t *ret_super_blk,
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blk64_t *ret_old_desc_blk,
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blk64_t *ret_new_desc_blk,
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blk_t *ret_used_blks)
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{
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blk64_t group_block, super_blk = 0, old_desc_blk = 0, new_desc_blk = 0;
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unsigned int meta_bg, meta_bg_size;
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blk_t numblocks = 0;
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blk64_t old_desc_blocks;
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int has_super;
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group_block = ext2fs_group_first_block2(fs, group);
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if (group_block == 0 && fs->blocksize == 1024)
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group_block = 1; /* Deal with 1024 blocksize && bigalloc */
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if (ext2fs_has_feature_meta_bg(fs->super))
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old_desc_blocks = fs->super->s_first_meta_bg;
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else
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old_desc_blocks =
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fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
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has_super = ext2fs_bg_has_super(fs, group);
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if (has_super) {
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super_blk = group_block;
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numblocks++;
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}
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meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
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meta_bg = group / meta_bg_size;
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if (!ext2fs_has_feature_meta_bg(fs->super) ||
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(meta_bg < fs->super->s_first_meta_bg)) {
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if (has_super) {
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old_desc_blk = group_block + 1;
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numblocks += old_desc_blocks;
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}
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} else {
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if (((group % meta_bg_size) == 0) ||
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((group % meta_bg_size) == 1) ||
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((group % meta_bg_size) == (meta_bg_size-1))) {
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if (has_super)
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has_super = 1;
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new_desc_blk = group_block + has_super;
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numblocks++;
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}
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}
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if (ret_super_blk)
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*ret_super_blk = super_blk;
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if (ret_old_desc_blk)
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*ret_old_desc_blk = old_desc_blk;
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if (ret_new_desc_blk)
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*ret_new_desc_blk = new_desc_blk;
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if (ret_used_blks)
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*ret_used_blks = numblocks;
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return 0;
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}
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/*
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* This function returns the location of the superblock, block group
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* descriptors for a given block group. It currently returns the
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* number of free blocks assuming that inode table and allocation
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* bitmaps will be in the group. This is not necessarily the case
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* when the flex_bg feature is enabled, so callers should take care!
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* It was only really intended for use by mke2fs, and even there it's
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* not that useful.
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*
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* The ext2fs_super_and_bgd_loc2() function is 64-bit block number
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* capable and returns the number of blocks used by super block and
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* group descriptors.
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*/
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int ext2fs_super_and_bgd_loc(ext2_filsys fs,
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dgrp_t group,
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blk_t *ret_super_blk,
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blk_t *ret_old_desc_blk,
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blk_t *ret_new_desc_blk,
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int *ret_meta_bg)
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{
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blk64_t ret_super_blk2;
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blk64_t ret_old_desc_blk2;
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blk64_t ret_new_desc_blk2;
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blk_t ret_used_blks;
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blk_t numblocks;
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unsigned int meta_bg_size;
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ext2fs_super_and_bgd_loc2(fs, group, &ret_super_blk2,
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&ret_old_desc_blk2,
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&ret_new_desc_blk2,
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&ret_used_blks);
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numblocks = ext2fs_group_blocks_count(fs, group);
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if (ret_super_blk)
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*ret_super_blk = (blk_t)ret_super_blk2;
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if (ret_old_desc_blk)
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*ret_old_desc_blk = (blk_t)ret_old_desc_blk2;
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if (ret_new_desc_blk)
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*ret_new_desc_blk = (blk_t)ret_new_desc_blk2;
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if (ret_meta_bg) {
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meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
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*ret_meta_bg = group / meta_bg_size;
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}
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numblocks -= 2 + fs->inode_blocks_per_group + ret_used_blks;
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return numblocks;
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}
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/*
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* This function forces out the primary superblock. We need to only
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* write out those fields which we have changed, since if the
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* filesystem is mounted, it may have changed some of the other
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* fields.
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*
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* It takes as input a superblock which has already been byte swapped
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* (if necessary).
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*
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*/
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static errcode_t write_primary_superblock(ext2_filsys fs,
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struct ext2_super_block *super)
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{
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__u16 *old_super, *new_super;
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int check_idx, write_idx, size;
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errcode_t retval;
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if (!fs->io->manager->write_byte || !fs->orig_super) {
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fallback:
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io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET);
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retval = io_channel_write_blk64(fs->io, 1, -SUPERBLOCK_SIZE,
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super);
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io_channel_set_blksize(fs->io, fs->blocksize);
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return retval;
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}
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old_super = (__u16 *) fs->orig_super;
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new_super = (__u16 *) super;
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for (check_idx = 0; check_idx < SUPERBLOCK_SIZE/2; check_idx++) {
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if (old_super[check_idx] == new_super[check_idx])
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continue;
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write_idx = check_idx;
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for (check_idx++; check_idx < SUPERBLOCK_SIZE/2; check_idx++)
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if (old_super[check_idx] == new_super[check_idx])
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break;
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size = 2 * (check_idx - write_idx);
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#if 0
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printf("Writing %d bytes starting at %d\n",
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size, write_idx*2);
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#endif
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retval = io_channel_write_byte(fs->io,
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SUPERBLOCK_OFFSET + (2 * write_idx), size,
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new_super + write_idx);
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if (retval == EXT2_ET_UNIMPLEMENTED)
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goto fallback;
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if (retval)
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return retval;
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}
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memcpy(fs->orig_super, super, SUPERBLOCK_SIZE);
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return 0;
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}
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/*
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* Updates the revision to EXT2_DYNAMIC_REV
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*/
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void ext2fs_update_dynamic_rev(ext2_filsys fs)
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{
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struct ext2_super_block *sb = fs->super;
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if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
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return;
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sb->s_rev_level = EXT2_DYNAMIC_REV;
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sb->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
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sb->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
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/* s_uuid is handled by e2fsck already */
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/* other fields should be left alone */
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}
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static errcode_t write_backup_super(ext2_filsys fs, dgrp_t group,
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blk64_t group_block,
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struct ext2_super_block *super_shadow)
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{
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errcode_t retval;
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dgrp_t sgrp = group;
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if (sgrp > ((1 << 16) - 1))
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sgrp = (1 << 16) - 1;
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super_shadow->s_block_group_nr = ext2fs_cpu_to_le16(sgrp);
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retval = ext2fs_superblock_csum_set(fs, super_shadow);
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if (retval)
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return retval;
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return io_channel_write_blk64(fs->io, group_block, -SUPERBLOCK_SIZE,
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super_shadow);
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}
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errcode_t ext2fs_flush(ext2_filsys fs)
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{
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return ext2fs_flush2(fs, 0);
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}
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errcode_t ext2fs_flush2(ext2_filsys fs, int flags)
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{
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dgrp_t i;
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errcode_t retval;
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unsigned long fs_state;
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__u32 feature_incompat;
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struct ext2_super_block *super_shadow = 0;
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struct opaque_ext2_group_desc *group_shadow = 0;
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#ifdef WORDS_BIGENDIAN
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struct ext2_group_desc *gdp;
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dgrp_t j;
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#endif
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char *group_ptr;
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blk64_t old_desc_blocks;
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struct ext2fs_numeric_progress_struct progress;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if ((fs->flags & EXT2_FLAG_SUPER_ONLY) == 0 &&
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!ext2fs_has_feature_journal_dev(fs->super) &&
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fs->group_desc == NULL)
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return EXT2_ET_NO_GDESC;
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fs_state = fs->super->s_state;
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feature_incompat = fs->super->s_feature_incompat;
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fs->super->s_wtime = fs->now ? fs->now : time(NULL);
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fs->super->s_block_group_nr = 0;
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/*
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* If the write_bitmaps() function is present, call it to
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* flush the bitmaps. This is done this way so that a simple
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* program that doesn't mess with the bitmaps doesn't need to
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* drag in the bitmaps.c code.
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*
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* Bitmap checksums live in the group descriptor, so the
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* bitmaps need to be written before the descriptors.
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*/
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if (fs->write_bitmaps) {
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retval = fs->write_bitmaps(fs);
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if (retval)
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goto errout;
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}
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/*
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* Set the state of the FS to be non-valid. (The state has
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* already been backed up earlier, and will be restored after
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* we write out the backup superblocks.)
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*/
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fs->super->s_state &= ~EXT2_VALID_FS;
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ext2fs_clear_feature_journal_needs_recovery(fs->super);
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/* Byte swap the superblock and the group descriptors if necessary */
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#ifdef WORDS_BIGENDIAN
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retval = EXT2_ET_NO_MEMORY;
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retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super_shadow);
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if (retval)
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goto errout;
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memcpy(super_shadow, fs->super, sizeof(struct ext2_super_block));
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ext2fs_swap_super(super_shadow);
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if (((fs->flags & EXT2_FLAG_SUPER_ONLY) == 0) &&
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!ext2fs_has_feature_journal_dev(fs->super)) {
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retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
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&group_shadow);
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if (retval)
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goto errout;
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memcpy(group_shadow, fs->group_desc, (size_t) fs->blocksize *
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fs->desc_blocks);
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for (j = 0; j < fs->group_desc_count; j++) {
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gdp = ext2fs_group_desc(fs, group_shadow, j);
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ext2fs_swap_group_desc2(fs, gdp);
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}
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}
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#else
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super_shadow = fs->super;
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group_shadow = fs->group_desc;
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#endif
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/*
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* If this is an external journal device, don't write out the
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* block group descriptors or any of the backup superblocks
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*/
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if (ext2fs_has_feature_journal_dev(fs->super))
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goto write_primary_superblock_only;
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/*
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* Write out the master group descriptors, and the backup
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* superblocks and group descriptors.
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*/
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group_ptr = (char *) group_shadow;
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if (ext2fs_has_feature_meta_bg(fs->super)) {
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old_desc_blocks = fs->super->s_first_meta_bg;
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if (old_desc_blocks > fs->desc_blocks)
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old_desc_blocks = fs->desc_blocks;
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} else
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old_desc_blocks = fs->desc_blocks;
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if (fs->progress_ops && fs->progress_ops->init)
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(fs->progress_ops->init)(fs, &progress, NULL,
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fs->group_desc_count);
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for (i = 0; i < fs->group_desc_count; i++) {
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blk64_t super_blk, old_desc_blk, new_desc_blk;
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if (fs->progress_ops && fs->progress_ops->update)
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(fs->progress_ops->update)(fs, &progress, i);
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ext2fs_super_and_bgd_loc2(fs, i, &super_blk, &old_desc_blk,
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&new_desc_blk, 0);
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if (!(fs->flags & EXT2_FLAG_MASTER_SB_ONLY) &&i && super_blk) {
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retval = write_backup_super(fs, i, super_blk,
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super_shadow);
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if (retval)
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goto errout;
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}
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if (fs->flags & EXT2_FLAG_SUPER_ONLY)
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continue;
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if ((old_desc_blk) &&
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(!(fs->flags & EXT2_FLAG_MASTER_SB_ONLY) || (i == 0))) {
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retval = io_channel_write_blk64(fs->io,
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old_desc_blk, old_desc_blocks, group_ptr);
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if (retval)
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goto errout;
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}
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if (new_desc_blk) {
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int meta_bg = i / EXT2_DESC_PER_BLOCK(fs->super);
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retval = io_channel_write_blk64(fs->io, new_desc_blk,
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1, group_ptr + (meta_bg*fs->blocksize));
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if (retval)
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goto errout;
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}
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}
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if (fs->progress_ops && fs->progress_ops->close)
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(fs->progress_ops->close)(fs, &progress, NULL);
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write_primary_superblock_only:
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/*
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* Write out master superblock. This has to be done
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* separately, since it is located at a fixed location
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* (SUPERBLOCK_OFFSET). We flush all other pending changes
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* out to disk first, just to avoid a race condition with an
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* insy-tinsy window....
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*/
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fs->super->s_block_group_nr = 0;
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fs->super->s_state = fs_state;
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fs->super->s_feature_incompat = feature_incompat;
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#ifdef WORDS_BIGENDIAN
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*super_shadow = *fs->super;
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ext2fs_swap_super(super_shadow);
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#endif
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retval = ext2fs_superblock_csum_set(fs, super_shadow);
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if (retval)
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return retval;
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if (!(flags & EXT2_FLAG_FLUSH_NO_SYNC)) {
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retval = io_channel_flush(fs->io);
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if (retval)
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goto errout;
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}
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retval = write_primary_superblock(fs, super_shadow);
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if (retval)
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goto errout;
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fs->flags &= ~EXT2_FLAG_DIRTY;
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if (!(flags & EXT2_FLAG_FLUSH_NO_SYNC)) {
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retval = io_channel_flush(fs->io);
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if (retval)
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goto errout;
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}
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errout:
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fs->super->s_state = fs_state;
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#ifdef WORDS_BIGENDIAN
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if (super_shadow)
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ext2fs_free_mem(&super_shadow);
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if (group_shadow)
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ext2fs_free_mem(&group_shadow);
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#endif
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return retval;
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}
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errcode_t ext2fs_close_free(ext2_filsys *fs_ptr)
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{
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errcode_t ret;
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ext2_filsys fs = *fs_ptr;
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ret = ext2fs_close2(fs, 0);
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if (ret)
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ext2fs_free(fs);
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*fs_ptr = NULL;
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return ret;
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}
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errcode_t ext2fs_close(ext2_filsys fs)
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{
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return ext2fs_close2(fs, 0);
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}
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errcode_t ext2fs_close2(ext2_filsys fs, int flags)
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{
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errcode_t retval;
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int meta_blks;
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io_stats stats = 0;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (fs->write_bitmaps) {
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retval = fs->write_bitmaps(fs);
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if (retval)
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return retval;
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}
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if (fs->super->s_kbytes_written &&
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fs->io->manager->get_stats)
|
|
fs->io->manager->get_stats(fs->io, &stats);
|
|
if (stats && stats->bytes_written && (fs->flags & EXT2_FLAG_RW)) {
|
|
fs->super->s_kbytes_written += stats->bytes_written >> 10;
|
|
meta_blks = fs->desc_blocks + 1;
|
|
if (!(fs->flags & EXT2_FLAG_SUPER_ONLY))
|
|
fs->super->s_kbytes_written += meta_blks /
|
|
(fs->blocksize / 1024);
|
|
if ((fs->flags & EXT2_FLAG_DIRTY) == 0)
|
|
fs->flags |= EXT2_FLAG_SUPER_ONLY | EXT2_FLAG_DIRTY;
|
|
}
|
|
if (fs->flags & EXT2_FLAG_DIRTY) {
|
|
retval = ext2fs_flush2(fs, flags);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
retval = ext2fs_mmp_stop(fs);
|
|
if (retval)
|
|
return retval;
|
|
|
|
ext2fs_free(fs);
|
|
return 0;
|
|
}
|
|
|