diff options
Diffstat (limited to 'e2fslib/closefs.c')
-rw-r--r-- | e2fslib/closefs.c | 291 |
1 files changed, 0 insertions, 291 deletions
diff --git a/e2fslib/closefs.c b/e2fslib/closefs.c deleted file mode 100644 index f52c343..0000000 --- a/e2fslib/closefs.c +++ /dev/null @@ -1,291 +0,0 @@ -/* - * closefs.c --- close an ext2 filesystem - * - * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. - * - * %Begin-Header% - * This file may be redistributed under the terms of the GNU Public - * License. - * %End-Header% - */ - -#include <stdio.h> -#if HAVE_UNISTD_H -#include <unistd.h> -#endif -#include <time.h> -#include <string.h> - -#include "ext2_fs.h" -#include "ext2fsP.h" - -static int test_root(int a, int b) -{ - if (a == 0) - return 1; - while (1) { - if (a == 1) - return 1; - if (a % b) - return 0; - a = a / b; - } -} - -int ext2fs_bg_has_super(ext2_filsys fs, int group_block) -{ - if (!(fs->super->s_feature_ro_compat & - EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)) - return 1; - - if (test_root(group_block, 3) || (test_root(group_block, 5)) || - test_root(group_block, 7)) - return 1; - - return 0; -} - -/* - * This function forces out the primary superblock. We need to only - * write out those fields which we have changed, since if the - * filesystem is mounted, it may have changed some of the other - * fields. - * - * It takes as input a superblock which has already been byte swapped - * (if necessary). - * - */ -static errcode_t write_primary_superblock(ext2_filsys fs, - struct ext2_super_block *super) -{ - __u16 *old_super, *new_super; - int check_idx, write_idx, size; - errcode_t retval; - - if (!fs->io->manager->write_byte || !fs->orig_super) { - io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET); - retval = io_channel_write_blk(fs->io, 1, -SUPERBLOCK_SIZE, - super); - io_channel_set_blksize(fs->io, fs->blocksize); - return retval; - } - - old_super = (__u16 *) fs->orig_super; - new_super = (__u16 *) super; - - for (check_idx = 0; check_idx < SUPERBLOCK_SIZE/2; check_idx++) { - if (old_super[check_idx] == new_super[check_idx]) - continue; - write_idx = check_idx; - for (check_idx++; check_idx < SUPERBLOCK_SIZE/2; check_idx++) - if (old_super[check_idx] == new_super[check_idx]) - break; - size = 2 * (check_idx - write_idx); -#if 0 - printf("Writing %d bytes starting at %d\n", - size, write_idx*2); -#endif - retval = io_channel_write_byte(fs->io, - SUPERBLOCK_OFFSET + (2 * write_idx), size, - new_super + write_idx); - if (retval) - return retval; - } - memcpy(fs->orig_super, super, SUPERBLOCK_SIZE); - return 0; -} - - -/* - * Updates the revision to EXT2_DYNAMIC_REV - */ -void ext2fs_update_dynamic_rev(ext2_filsys fs) -{ - struct ext2_super_block *sb = fs->super; - - if (sb->s_rev_level > EXT2_GOOD_OLD_REV) - return; - - sb->s_rev_level = EXT2_DYNAMIC_REV; - sb->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; - sb->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; - /* s_uuid is handled by e2fsck already */ - /* other fields should be left alone */ -} - -errcode_t ext2fs_flush(ext2_filsys fs) -{ - dgrp_t i,j,maxgroup,sgrp; - blk_t group_block; - errcode_t retval; - char *group_ptr; - unsigned long fs_state; - struct ext2_super_block *super_shadow = 0; - struct ext2_group_desc *group_shadow = 0; - struct ext2_group_desc *s, *t; - - EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); - - fs_state = fs->super->s_state; - - fs->super->s_wtime = time(NULL); - fs->super->s_block_group_nr = 0; -#ifdef EXT2FS_ENABLE_SWAPFS - if (fs->flags & EXT2_FLAG_SWAP_BYTES) { - retval = EXT2_ET_NO_MEMORY; - retval = ext2fs_get_mem(SUPERBLOCK_SIZE, - (void **) &super_shadow); - if (retval) - goto errout; - retval = ext2fs_get_mem((size_t)(fs->blocksize * - fs->desc_blocks), - (void **) &group_shadow); - if (retval) - goto errout; - memset(group_shadow, 0, (size_t) fs->blocksize * - fs->desc_blocks); - - /* swap the superblock */ - *super_shadow = *fs->super; - ext2fs_swap_super(super_shadow); - - /* swap the group descriptors */ - for (j=0, s=fs->group_desc, t=group_shadow; - j < fs->group_desc_count; j++, t++, s++) { - *t = *s; - ext2fs_swap_group_desc(t); - } - } else { - super_shadow = fs->super; - group_shadow = fs->group_desc; - } -#else - super_shadow = fs->super; - group_shadow = fs->group_desc; -#endif - - /* - * Write out master superblock. This has to be done - * separately, since it is located at a fixed location - * (SUPERBLOCK_OFFSET). - */ - retval = write_primary_superblock(fs, super_shadow); - if (retval) - goto errout; - - /* - * If this is an external journal device, don't write out the - * block group descriptors or any of the backup superblocks - */ - if (fs->super->s_feature_incompat & - EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { - retval = 0; - goto errout; - } - - /* - * Set the state of the FS to be non-valid. (The state has - * already been backed up earlier, and will be restored when - * we exit.) - */ - fs->super->s_state &= ~EXT2_VALID_FS; -#ifdef EXT2FS_ENABLE_SWAPFS - if (fs->flags & EXT2_FLAG_SWAP_BYTES) { - *super_shadow = *fs->super; - ext2fs_swap_super(super_shadow); - } -#endif - - /* - * Write out the master group descriptors, and the backup - * superblocks and group descriptors. - */ - group_block = fs->super->s_first_data_block; - maxgroup = (fs->flags & EXT2_FLAG_MASTER_SB_ONLY) ? 1 : - fs->group_desc_count; - for (i = 0; i < maxgroup; i++) { - if (!ext2fs_bg_has_super(fs, i)) - goto next_group; - - sgrp = i; - if (sgrp > ((1 << 16) - 1)) - sgrp = (1 << 16) - 1; -#ifdef EXT2FS_ENABLE_SWAPFS - if (fs->flags & EXT2_FLAG_SWAP_BYTES) - super_shadow->s_block_group_nr = ext2fs_swab16(sgrp); - else -#endif - fs->super->s_block_group_nr = sgrp; - - if (i !=0 ) { - retval = io_channel_write_blk(fs->io, group_block, - -SUPERBLOCK_SIZE, - super_shadow); - if (retval) - goto errout; - } - if (fs->flags & EXT2_FLAG_SUPER_ONLY) - goto next_group; - group_ptr = (char *) group_shadow; - for (j=0; j < fs->desc_blocks; j++) { - retval = io_channel_write_blk(fs->io, - group_block+1+j, 1, - group_ptr); - if (retval) - goto errout; - group_ptr += fs->blocksize; - } - next_group: - group_block += EXT2_BLOCKS_PER_GROUP(fs->super); - } - fs->super->s_block_group_nr = 0; - - /* - * If the write_bitmaps() function is present, call it to - * flush the bitmaps. This is done this way so that a simple - * program that doesn't mess with the bitmaps doesn't need to - * drag in the bitmaps.c code. - */ - if (fs->write_bitmaps) { - retval = fs->write_bitmaps(fs); - if (retval) - goto errout; - } - - fs->flags &= ~EXT2_FLAG_DIRTY; - - /* - * Flush the blocks out to disk - */ - retval = io_channel_flush(fs->io); -errout: - fs->super->s_state = fs_state; - if (fs->flags & EXT2_FLAG_SWAP_BYTES) { - if (super_shadow) - ext2fs_free_mem((void **) &super_shadow); - if (group_shadow) - ext2fs_free_mem((void **) &group_shadow); - } - return retval; -} - -errcode_t ext2fs_close(ext2_filsys fs) -{ - errcode_t retval; - - EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); - - if (fs->flags & EXT2_FLAG_DIRTY) { - retval = ext2fs_flush(fs); - if (retval) - return retval; - } - if (fs->write_bitmaps) { - retval = fs->write_bitmaps(fs); - if (retval) - return retval; - } - ext2fs_free(fs); - return 0; -} - |