mirror of https://github.com/vitalif/e2fsprogs
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
/*
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* closefs.c --- close an ext2 filesystem
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*
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* Copyright (C) 1993, 1994 Theodore Ts'o. This file may be redistributed
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* under the terms of the GNU Public License.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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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 <linux/ext2_fs.h>
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#include "ext2fs.h"
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errcode_t ext2fs_flush(ext2_filsys fs)
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{
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int i,j;
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int group_block;
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errcode_t retval;
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char *group_ptr;
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unsigned long fs_state;
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struct ext2_super_block *super_shadow = 0;
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struct ext2_group_desc *group_shadow = 0;
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struct ext2_group_desc *s, *t;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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fs_state = fs->super->s_state;
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fs->super->s_wtime = time(NULL);
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if (fs->flags & EXT2_SWAP_BYTES) {
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retval = ENOMEM;
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if (!(super_shadow = malloc(SUPERBLOCK_SIZE)))
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goto errout;
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if (!(group_shadow = malloc(fs->blocksize*fs->desc_blocks)))
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goto errout;
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memset(group_shadow, 0, fs->blocksize*fs->desc_blocks);
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/* swap the superblock */
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*super_shadow = *fs->super;
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ext2fs_swap_super(super_shadow);
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/* swap the group descriptors */
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for (j=0, s=fs->group_desc, t=group_shadow;
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j < fs->group_desc_count; j++, t++, s++) {
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*t = *s;
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ext2fs_swap_group_desc(t);
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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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}
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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).
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*/
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io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET);
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retval = io_channel_write_blk(fs->io, 1, -SUPERBLOCK_SIZE,
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super_shadow);
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if (retval)
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goto errout;
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io_channel_set_blksize(fs->io, fs->blocksize);
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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 when
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* we exit.)
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*/
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fs->super->s_state &= ~EXT2_VALID_FS;
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if (fs->flags & EXT2_SWAP_BYTES) {
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*super_shadow = *fs->super;
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ext2fs_swap_super(super_shadow);
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}
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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_block = fs->super->s_first_data_block;
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for (i = 0; i < fs->group_desc_count; i++) {
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if (i !=0 ) {
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retval = io_channel_write_blk(fs->io, group_block,
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-SUPERBLOCK_SIZE,
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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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group_ptr = (char *) group_shadow;
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for (j=0; j < fs->desc_blocks; j++) {
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retval = io_channel_write_blk(fs->io,
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group_block+1+j, 1,
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group_ptr);
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if (retval)
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goto errout;
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group_ptr += fs->blocksize;
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}
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group_block += EXT2_BLOCKS_PER_GROUP(fs->super);
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}
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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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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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retval = 0;
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errout:
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fs->super->s_state = fs_state;
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if (fs->flags & EXT2_SWAP_BYTES) {
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if (super_shadow)
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free(super_shadow);
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if (group_shadow)
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free(group_shadow);
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}
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return retval;
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}
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errcode_t ext2fs_close(ext2_filsys fs)
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{
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errcode_t retval;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (fs->flags & EXT2_FLAG_DIRTY) {
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retval = ext2fs_flush(fs);
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if (retval)
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return retval;
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}
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ext2fs_free(fs);
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return 0;
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}
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