1997-04-26 17:34:30 +04:00
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/*
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* rw_bitmaps.c --- routines to read and write the inode and block bitmaps.
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*
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1997-04-29 20:17:09 +04:00
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* Copyright (C) 1993, 1994, 1994, 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 Public
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* License.
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* %End-Header%
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1997-04-26 17:34:30 +04:00
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*/
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#include <stdio.h>
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#include <string.h>
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1997-08-11 03:07:40 +04:00
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#if HAVE_UNISTD_H
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1997-04-26 17:34:30 +04:00
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#include <unistd.h>
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1997-08-11 03:07:40 +04:00
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#endif
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1997-04-26 17:34:30 +04:00
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#include <fcntl.h>
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#include <time.h>
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1997-10-20 04:52:43 +04:00
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#ifdef HAVE_SYS_STAT_H
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1997-04-26 17:34:30 +04:00
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#include <sys/stat.h>
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1997-10-20 04:52:43 +04:00
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#endif
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#ifdef HAVE_SYS_TYPES_H
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1997-04-26 17:34:30 +04:00
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#include <sys/types.h>
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1997-10-20 04:52:43 +04:00
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#endif
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1997-04-26 17:34:30 +04:00
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|
Many files:
inode.c (ext2fs_open_inode_scan): Initialize the group variables
so that we don't need to call get_next_blockgroup() the first
time around. Saves a bit of time, and prevents us from
needing to assign -1 to current_group (which is an unsigned
value).
icount.c (insert_icount_el): Cast the estimated number of inodes
from a float to an ino_t.
alloc.c, alloc_tables.c, badlbocks.c, bb_compat.c, bb_inode.c,
bitmaps.c, bitops.c, block.c, bmap.c, bmove.c, brel_ma.c,
check_desc.c, closefs.c, cmp_bitmaps.c, dblist.c,
dblist_dir.c, dir_iterate.c, dirblock.c, dupfs.c, expanddir.c,
ext2fs.h, fileio.c, freefs.c, get_pathname.c, getsize.c,
icount.c, initialize.c, inline.c, inode.c, irel_ma.c,
ismounted.c, link.c, lookup.c, mkdir.c, namei.c, native.c,
newdir.c, openfs.c, read_bb.c, read_bb_file.c, rs_bitmap.c,
rw_bitmaps.c, swapfs.c, test_io.c, tst_badblocks.c,
tst_getsize.c, tst_iscan.c, unix_io.c, unlink.c, valid_blk.c,
version.c: If EXT2_FLAT_INCLUDES is defined, then assume all
of the ext2-specific header files are in a flat directory.
block.c, bmove.c, dirblock.c, fileio.c: Explicitly cast
all assignments from void * to be compatible with C++.
closefs.c (ext2fs_flush): Add a call to io_channel_flush() to
make sure the contents of the disk are flushed to disk.
dblist.c (ext2fs_add_dir_block): Change new to be new_entry to
avoid C++ namespace clash.
bitmaps.c (ext2fs_copy_bitmap): Change new to be new_map to
avoid C++ namespace clash.
ext2fs.h, bb_inode.c, block.c, bmove.c, brel.h, brel_ma.c,
irel.h, irel_ma.c, dblist.c, dblist_dir.c, dir_iterate.c,
ext2fsP.h, expanddir.c, get_pathname.c, inode.c, link.c,
unlink.c: Change private to be priv_data (to avoid C++
namespace clash)
1998-01-19 17:47:53 +03:00
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#include "ext2_fs.h"
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1997-04-26 17:34:30 +04:00
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#include "ext2fs.h"
|
2001-05-03 08:02:29 +04:00
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#include "e2image.h"
|
1997-04-26 17:34:30 +04:00
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|
2006-04-23 20:43:40 +04:00
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|
static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
|
1997-04-26 17:34:30 +04:00
|
|
|
{
|
1998-09-03 05:22:57 +04:00
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|
dgrp_t i;
|
2003-12-07 09:28:50 +03:00
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|
|
unsigned int j;
|
2006-04-23 20:43:40 +04:00
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|
int block_nbytes, inode_nbytes;
|
2003-12-07 09:28:50 +03:00
|
|
|
unsigned int nbits;
|
1997-04-26 17:34:30 +04:00
|
|
|
errcode_t retval;
|
2006-04-23 20:43:40 +04:00
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|
char *block_buf, *inode_buf;
|
2008-04-21 07:33:34 +04:00
|
|
|
int csum_flag = 0;
|
1997-04-29 20:17:09 +04:00
|
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|
blk_t blk;
|
2007-07-23 12:32:48 +04:00
|
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|
blk_t blk_itr = fs->super->s_first_data_block;
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|
|
ext2_ino_t ino_itr = 1;
|
1997-04-26 17:34:30 +04:00
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|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
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|
|
if (!(fs->flags & EXT2_FLAG_RW))
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|
|
return EXT2_ET_RO_FILSYS;
|
2008-04-21 07:33:34 +04:00
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|
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|
|
|
|
if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
|
|
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
|
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|
csum_flag = 1;
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|
|
2006-04-23 20:43:40 +04:00
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|
inode_nbytes = block_nbytes = 0;
|
|
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|
if (do_block) {
|
|
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block_nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
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retval = ext2fs_get_mem(fs->blocksize, &block_buf);
|
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|
|
if (retval)
|
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|
return retval;
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|
|
memset(block_buf, 0xff, fs->blocksize);
|
|
|
|
}
|
|
|
|
if (do_inode) {
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inode_nbytes = (size_t)
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((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
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retval = ext2fs_get_mem(fs->blocksize, &inode_buf);
|
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|
|
if (retval)
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|
return retval;
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|
|
memset(inode_buf, 0xff, fs->blocksize);
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|
|
}
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|
1997-04-26 17:34:30 +04:00
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|
for (i = 0; i < fs->group_desc_count; i++) {
|
2007-07-23 12:32:48 +04:00
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|
if (!do_block)
|
2006-04-23 20:43:40 +04:00
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|
goto skip_block_bitmap;
|
2006-05-09 04:17:26 +04:00
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|
2008-04-21 07:33:34 +04:00
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|
if (csum_flag && fs->group_desc[i].bg_flags &
|
2006-05-09 04:17:26 +04:00
|
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|
EXT2_BG_BLOCK_UNINIT)
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|
goto skip_this_block_bitmap;
|
2006-04-23 20:43:40 +04:00
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2007-07-23 12:32:48 +04:00
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retval = ext2fs_get_block_bitmap_range(fs->block_map,
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blk_itr, block_nbytes << 3, block_buf);
|
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|
|
if (retval)
|
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|
|
return retval;
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|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
if (i == fs->group_desc_count - 1) {
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|
|
/* Force bitmap padding for the last group */
|
2003-12-07 09:28:50 +03:00
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|
nbits = ((fs->super->s_blocks_count
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|
- fs->super->s_first_data_block)
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% EXT2_BLOCKS_PER_GROUP(fs->super));
|
1997-04-26 17:34:30 +04:00
|
|
|
if (nbits)
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for (j = nbits; j < fs->blocksize * 8; j++)
|
2006-04-23 20:43:40 +04:00
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ext2fs_set_bit(j, block_buf);
|
1997-04-26 17:34:30 +04:00
|
|
|
}
|
1997-04-29 20:17:09 +04:00
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|
blk = fs->group_desc[i].bg_block_bitmap;
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|
|
if (blk) {
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|
retval = io_channel_write_blk(fs->io, blk, 1,
|
2006-04-23 20:43:40 +04:00
|
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block_buf);
|
1997-04-29 20:17:09 +04:00
|
|
|
if (retval)
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return EXT2_ET_BLOCK_BITMAP_WRITE;
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|
|
|
}
|
2006-05-09 04:17:26 +04:00
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|
skip_this_block_bitmap:
|
2007-07-23 12:32:48 +04:00
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blk_itr += block_nbytes << 3;
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2006-04-23 20:43:40 +04:00
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skip_block_bitmap:
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2007-07-23 12:32:48 +04:00
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if (!do_inode)
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2006-04-23 20:43:40 +04:00
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continue;
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|
2008-04-21 07:33:34 +04:00
|
|
|
if (csum_flag && fs->group_desc[i].bg_flags &
|
2006-05-09 04:17:26 +04:00
|
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EXT2_BG_INODE_UNINIT)
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goto skip_this_inode_bitmap;
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|
2007-07-23 12:32:48 +04:00
|
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retval = ext2fs_get_inode_bitmap_range(fs->inode_map,
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|
ino_itr, inode_nbytes << 3, inode_buf);
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|
if (retval)
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|
return retval;
|
|
|
|
|
2006-04-23 20:43:40 +04:00
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|
blk = fs->group_desc[i].bg_inode_bitmap;
|
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|
|
if (blk) {
|
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|
|
retval = io_channel_write_blk(fs->io, blk, 1,
|
|
|
|
inode_buf);
|
|
|
|
if (retval)
|
|
|
|
return EXT2_ET_INODE_BITMAP_WRITE;
|
|
|
|
}
|
2006-05-09 04:17:26 +04:00
|
|
|
skip_this_inode_bitmap:
|
2007-07-23 12:32:48 +04:00
|
|
|
ino_itr += inode_nbytes << 3;
|
2006-04-23 20:43:40 +04:00
|
|
|
|
|
|
|
}
|
|
|
|
if (do_block) {
|
|
|
|
fs->flags &= ~EXT2_FLAG_BB_DIRTY;
|
|
|
|
ext2fs_free_mem(&block_buf);
|
|
|
|
}
|
|
|
|
if (do_inode) {
|
|
|
|
fs->flags &= ~EXT2_FLAG_IB_DIRTY;
|
|
|
|
ext2fs_free_mem(&inode_buf);
|
1997-04-26 17:34:30 +04:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
|
|
|
|
{
|
1998-09-03 05:22:57 +04:00
|
|
|
dgrp_t i;
|
1997-04-26 17:58:21 +04:00
|
|
|
char *block_bitmap = 0, *inode_bitmap = 0;
|
1997-04-26 17:34:30 +04:00
|
|
|
char *buf;
|
|
|
|
errcode_t retval;
|
2007-07-23 12:32:48 +04:00
|
|
|
unsigned int block_nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
|
|
|
|
unsigned inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
|
2008-04-21 07:33:34 +04:00
|
|
|
int csum_flag = 0;
|
2007-07-23 12:32:48 +04:00
|
|
|
int do_image = fs->flags & EXT2_FLAG_IMAGE_FILE;
|
|
|
|
unsigned int cnt;
|
1997-04-29 20:17:09 +04:00
|
|
|
blk_t blk;
|
2007-07-23 12:32:48 +04:00
|
|
|
blk_t blk_itr = fs->super->s_first_data_block;
|
|
|
|
blk_t blk_cnt;
|
|
|
|
ext2_ino_t ino_itr = 1;
|
|
|
|
ext2_ino_t ino_cnt;
|
1997-04-26 17:34:30 +04:00
|
|
|
|
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
|
|
|
|
fs->write_bitmaps = ext2fs_write_bitmaps;
|
|
|
|
|
2008-04-21 07:33:34 +04:00
|
|
|
if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
|
2007-10-22 06:03:25 +04:00
|
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
|
2008-04-21 07:33:34 +04:00
|
|
|
csum_flag = 1;
|
2006-05-09 04:17:26 +04:00
|
|
|
|
2003-08-01 17:41:07 +04:00
|
|
|
retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
|
1997-10-26 06:41:24 +03:00
|
|
|
if (retval)
|
|
|
|
return retval;
|
1997-04-26 17:34:30 +04:00
|
|
|
if (do_block) {
|
|
|
|
if (fs->block_map)
|
|
|
|
ext2fs_free_block_bitmap(fs->block_map);
|
|
|
|
sprintf(buf, "block bitmap for %s", fs->device_name);
|
|
|
|
retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
2007-07-23 12:32:48 +04:00
|
|
|
retval = ext2fs_get_mem(do_image ? fs->blocksize :
|
|
|
|
block_nbytes, &block_bitmap);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
|
|
|
} else
|
|
|
|
block_nbytes = 0;
|
1997-04-26 17:34:30 +04:00
|
|
|
if (do_inode) {
|
|
|
|
if (fs->inode_map)
|
|
|
|
ext2fs_free_inode_bitmap(fs->inode_map);
|
|
|
|
sprintf(buf, "inode bitmap for %s", fs->device_name);
|
|
|
|
retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
2007-07-23 12:32:48 +04:00
|
|
|
retval = ext2fs_get_mem(do_image ? fs->blocksize :
|
|
|
|
inode_nbytes, &inode_bitmap);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
|
|
|
} else
|
|
|
|
inode_nbytes = 0;
|
2003-08-01 17:41:07 +04:00
|
|
|
ext2fs_free_mem(&buf);
|
1997-04-26 17:34:30 +04:00
|
|
|
|
2001-05-03 08:02:29 +04:00
|
|
|
if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
|
2007-07-23 12:32:48 +04:00
|
|
|
blk = (fs->image_header->offset_inodemap / fs->blocksize);
|
|
|
|
ino_cnt = fs->super->s_inodes_count;
|
|
|
|
while (inode_nbytes > 0) {
|
|
|
|
retval = io_channel_read_blk(fs->image_io, blk++,
|
|
|
|
1, inode_bitmap);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
|
|
|
cnt = fs->blocksize << 3;
|
|
|
|
if (cnt > ino_cnt)
|
|
|
|
cnt = ino_cnt;
|
|
|
|
retval = ext2fs_set_inode_bitmap_range(fs->inode_map,
|
|
|
|
ino_itr, cnt, inode_bitmap);
|
2001-05-03 08:02:29 +04:00
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
2007-07-23 12:32:48 +04:00
|
|
|
ino_itr += fs->blocksize << 3;
|
|
|
|
ino_cnt -= fs->blocksize << 3;
|
|
|
|
inode_nbytes -= fs->blocksize;
|
2001-05-03 08:02:29 +04:00
|
|
|
}
|
2007-07-23 12:32:48 +04:00
|
|
|
blk = (fs->image_header->offset_blockmap /
|
|
|
|
fs->blocksize);
|
|
|
|
blk_cnt = EXT2_BLOCKS_PER_GROUP(fs->super) *
|
|
|
|
fs->group_desc_count;
|
|
|
|
while (block_nbytes > 0) {
|
|
|
|
retval = io_channel_read_blk(fs->image_io, blk++,
|
|
|
|
1, block_bitmap);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
|
|
|
cnt = fs->blocksize << 3;
|
|
|
|
if (cnt > blk_cnt)
|
|
|
|
cnt = blk_cnt;
|
|
|
|
retval = ext2fs_set_block_bitmap_range(fs->block_map,
|
|
|
|
blk_itr, cnt, block_bitmap);
|
2001-05-03 08:02:29 +04:00
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
2007-07-23 12:32:48 +04:00
|
|
|
blk_itr += fs->blocksize << 3;
|
|
|
|
blk_cnt -= fs->blocksize << 3;
|
|
|
|
block_nbytes -= fs->blocksize;
|
2001-05-03 08:02:29 +04:00
|
|
|
}
|
2007-07-23 12:32:48 +04:00
|
|
|
goto success_cleanup;
|
2001-05-03 08:02:29 +04:00
|
|
|
}
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
for (i = 0; i < fs->group_desc_count; i++) {
|
1997-04-26 17:58:21 +04:00
|
|
|
if (block_bitmap) {
|
1997-04-29 20:17:09 +04:00
|
|
|
blk = fs->group_desc[i].bg_block_bitmap;
|
2008-04-21 07:33:34 +04:00
|
|
|
if (csum_flag && fs->group_desc[i].bg_flags &
|
2007-10-22 06:03:25 +04:00
|
|
|
EXT2_BG_BLOCK_UNINIT &&
|
|
|
|
ext2fs_group_desc_csum_verify(fs, i))
|
2006-05-09 04:17:26 +04:00
|
|
|
blk = 0;
|
1997-04-29 20:17:09 +04:00
|
|
|
if (blk) {
|
|
|
|
retval = io_channel_read_blk(fs->io, blk,
|
|
|
|
-block_nbytes, block_bitmap);
|
|
|
|
if (retval) {
|
|
|
|
retval = EXT2_ET_BLOCK_BITMAP_READ;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
} else
|
2006-05-09 04:17:26 +04:00
|
|
|
memset(block_bitmap, 0xff, block_nbytes);
|
2007-07-23 12:32:48 +04:00
|
|
|
cnt = block_nbytes << 3;
|
|
|
|
retval = ext2fs_set_block_bitmap_range(fs->block_map,
|
|
|
|
blk_itr, cnt, block_bitmap);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
|
|
|
blk_itr += block_nbytes << 3;
|
1997-04-26 17:34:30 +04:00
|
|
|
}
|
1997-04-26 17:58:21 +04:00
|
|
|
if (inode_bitmap) {
|
1997-04-29 20:17:09 +04:00
|
|
|
blk = fs->group_desc[i].bg_inode_bitmap;
|
2008-04-21 07:33:34 +04:00
|
|
|
if (csum_flag && fs->group_desc[i].bg_flags &
|
2007-10-22 06:03:25 +04:00
|
|
|
EXT2_BG_INODE_UNINIT &&
|
|
|
|
ext2fs_group_desc_csum_verify(fs, i))
|
2006-05-09 04:17:26 +04:00
|
|
|
blk = 0;
|
1997-04-29 20:17:09 +04:00
|
|
|
if (blk) {
|
|
|
|
retval = io_channel_read_blk(fs->io, blk,
|
|
|
|
-inode_nbytes, inode_bitmap);
|
|
|
|
if (retval) {
|
|
|
|
retval = EXT2_ET_INODE_BITMAP_READ;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
} else
|
2006-05-09 04:17:26 +04:00
|
|
|
memset(inode_bitmap, 0xff, inode_nbytes);
|
2007-07-23 12:32:48 +04:00
|
|
|
cnt = inode_nbytes << 3;
|
|
|
|
retval = ext2fs_set_inode_bitmap_range(fs->inode_map,
|
|
|
|
ino_itr, cnt, inode_bitmap);
|
|
|
|
if (retval)
|
|
|
|
goto cleanup;
|
|
|
|
ino_itr += inode_nbytes << 3;
|
1997-04-26 17:34:30 +04:00
|
|
|
}
|
|
|
|
}
|
2007-07-23 12:32:48 +04:00
|
|
|
success_cleanup:
|
|
|
|
if (inode_bitmap)
|
|
|
|
ext2fs_free_mem(&inode_bitmap);
|
|
|
|
if (block_bitmap)
|
|
|
|
ext2fs_free_mem(&block_bitmap);
|
1997-04-26 17:34:30 +04:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
if (do_block) {
|
2003-08-01 17:41:07 +04:00
|
|
|
ext2fs_free_mem(&fs->block_map);
|
1997-04-26 17:34:30 +04:00
|
|
|
fs->block_map = 0;
|
|
|
|
}
|
|
|
|
if (do_inode) {
|
2003-08-01 17:41:07 +04:00
|
|
|
ext2fs_free_mem(&fs->inode_map);
|
1997-04-26 17:34:30 +04:00
|
|
|
fs->inode_map = 0;
|
|
|
|
}
|
2007-07-23 12:32:48 +04:00
|
|
|
if (inode_bitmap)
|
|
|
|
ext2fs_free_mem(&inode_bitmap);
|
|
|
|
if (block_bitmap)
|
|
|
|
ext2fs_free_mem(&block_bitmap);
|
1997-04-26 17:34:30 +04:00
|
|
|
if (buf)
|
2003-08-01 17:41:07 +04:00
|
|
|
ext2fs_free_mem(&buf);
|
1997-04-26 17:34:30 +04:00
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2006-04-23 20:43:40 +04:00
|
|
|
errcode_t ext2fs_read_inode_bitmap(ext2_filsys fs)
|
1997-04-26 17:34:30 +04:00
|
|
|
{
|
|
|
|
return read_bitmaps(fs, 1, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
errcode_t ext2fs_read_block_bitmap(ext2_filsys fs)
|
|
|
|
{
|
|
|
|
return read_bitmaps(fs, 0, 1);
|
|
|
|
}
|
|
|
|
|
2006-04-23 20:43:40 +04:00
|
|
|
errcode_t ext2fs_write_inode_bitmap(ext2_filsys fs)
|
1997-04-26 17:34:30 +04:00
|
|
|
{
|
2006-04-23 20:43:40 +04:00
|
|
|
return write_bitmaps(fs, 1, 0);
|
|
|
|
}
|
1997-04-26 17:34:30 +04:00
|
|
|
|
2006-04-23 20:43:40 +04:00
|
|
|
errcode_t ext2fs_write_block_bitmap (ext2_filsys fs)
|
|
|
|
{
|
|
|
|
return write_bitmaps(fs, 0, 1);
|
|
|
|
}
|
1997-04-26 17:34:30 +04:00
|
|
|
|
2006-04-23 20:43:40 +04:00
|
|
|
errcode_t ext2fs_read_bitmaps(ext2_filsys fs)
|
|
|
|
{
|
1998-02-17 01:00:37 +03:00
|
|
|
if (fs->inode_map && fs->block_map)
|
|
|
|
return 0;
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
return read_bitmaps(fs, !fs->inode_map, !fs->block_map);
|
|
|
|
}
|
|
|
|
|
|
|
|
errcode_t ext2fs_write_bitmaps(ext2_filsys fs)
|
|
|
|
{
|
2006-04-23 20:43:40 +04:00
|
|
|
int do_inode = fs->inode_map && ext2fs_test_ib_dirty(fs);
|
|
|
|
int do_block = fs->block_map && ext2fs_test_bb_dirty(fs);
|
1997-04-26 17:34:30 +04:00
|
|
|
|
2006-04-23 20:43:40 +04:00
|
|
|
if (!do_inode && !do_block)
|
|
|
|
return 0;
|
1997-04-26 17:34:30 +04:00
|
|
|
|
2006-04-23 20:43:40 +04:00
|
|
|
return write_bitmaps(fs, do_inode, do_block);
|
|
|
|
}
|