1997-04-26 17:21:57 +04:00
|
|
|
/*
|
|
|
|
* alloc.c --- allocate new inodes, blocks for ext2fs
|
|
|
|
*
|
1997-04-29 20:15:03 +04:00
|
|
|
* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
|
|
|
|
*
|
|
|
|
* %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%
|
2008-08-28 07:07:54 +04:00
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*
|
1997-04-26 17:21:57 +04:00
|
|
|
*/
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|
#include <stdio.h>
|
1997-08-11 03:07:40 +04:00
|
|
|
#if HAVE_UNISTD_H
|
1997-04-26 17:21:57 +04:00
|
|
|
#include <unistd.h>
|
1997-08-11 03:07:40 +04:00
|
|
|
#endif
|
1997-04-26 17:21:57 +04:00
|
|
|
#include <time.h>
|
1997-10-26 02:37:42 +04:00
|
|
|
#include <string.h>
|
1997-10-20 03:00:21 +04:00
|
|
|
#if HAVE_SYS_STAT_H
|
1997-04-26 17:21:57 +04:00
|
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|
#include <sys/stat.h>
|
1997-10-20 03:00:21 +04:00
|
|
|
#endif
|
|
|
|
#if HAVE_SYS_TYPES_H
|
1997-04-26 17:21:57 +04:00
|
|
|
#include <sys/types.h>
|
1997-10-20 03:00:21 +04:00
|
|
|
#endif
|
1997-04-26 17:21:57 +04:00
|
|
|
|
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
|
|
|
#include "ext2_fs.h"
|
1997-04-26 17:21:57 +04:00
|
|
|
#include "ext2fs.h"
|
|
|
|
|
2008-08-22 10:52:12 +04:00
|
|
|
/*
|
|
|
|
* Check for uninit block bitmaps and deal with them appropriately
|
|
|
|
*/
|
2008-11-16 18:03:00 +03:00
|
|
|
static void check_block_uninit(ext2_filsys fs, ext2fs_block_bitmap map,
|
2008-08-22 10:52:12 +04:00
|
|
|
dgrp_t group)
|
|
|
|
{
|
2008-11-16 18:03:00 +03:00
|
|
|
blk_t i;
|
2009-07-12 05:29:30 +04:00
|
|
|
blk64_t blk, super_blk, old_desc_blk, new_desc_blk;
|
2008-08-22 10:52:12 +04:00
|
|
|
int old_desc_blocks;
|
|
|
|
|
|
|
|
if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
|
|
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) ||
|
|
|
|
!(fs->group_desc[group].bg_flags & EXT2_BG_BLOCK_UNINIT))
|
|
|
|
return;
|
|
|
|
|
|
|
|
blk = (group * fs->super->s_blocks_per_group) +
|
|
|
|
fs->super->s_first_data_block;
|
|
|
|
|
2009-07-12 05:29:30 +04:00
|
|
|
ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
|
|
|
|
&old_desc_blk, &new_desc_blk, 0);
|
2008-08-22 10:52:12 +04:00
|
|
|
|
|
|
|
if (fs->super->s_feature_incompat &
|
|
|
|
EXT2_FEATURE_INCOMPAT_META_BG)
|
|
|
|
old_desc_blocks = fs->super->s_first_meta_bg;
|
|
|
|
else
|
|
|
|
old_desc_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
|
|
|
|
|
|
|
|
for (i=0; i < fs->super->s_blocks_per_group; i++, blk++) {
|
|
|
|
if ((blk == super_blk) ||
|
|
|
|
(old_desc_blk && old_desc_blocks &&
|
|
|
|
(blk >= old_desc_blk) &&
|
|
|
|
(blk < old_desc_blk + old_desc_blocks)) ||
|
|
|
|
(new_desc_blk && (blk == new_desc_blk)) ||
|
|
|
|
(blk == fs->group_desc[group].bg_block_bitmap) ||
|
|
|
|
(blk == fs->group_desc[group].bg_inode_bitmap) ||
|
|
|
|
(blk >= fs->group_desc[group].bg_inode_table &&
|
|
|
|
(blk < fs->group_desc[group].bg_inode_table
|
|
|
|
+ fs->inode_blocks_per_group)))
|
|
|
|
ext2fs_fast_mark_block_bitmap(map, blk);
|
|
|
|
else
|
|
|
|
ext2fs_fast_unmark_block_bitmap(map, blk);
|
|
|
|
}
|
|
|
|
fs->group_desc[group].bg_flags &= ~EXT2_BG_BLOCK_UNINIT;
|
|
|
|
ext2fs_group_desc_csum_set(fs, group);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for uninit inode bitmaps and deal with them appropriately
|
|
|
|
*/
|
2008-11-16 18:03:00 +03:00
|
|
|
static void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map,
|
2008-08-22 10:52:12 +04:00
|
|
|
dgrp_t group)
|
|
|
|
{
|
2008-11-16 18:03:00 +03:00
|
|
|
ext2_ino_t i, ino;
|
2008-08-22 10:52:12 +04:00
|
|
|
|
|
|
|
if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
|
|
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) ||
|
|
|
|
!(fs->group_desc[group].bg_flags & EXT2_BG_INODE_UNINIT))
|
|
|
|
return;
|
|
|
|
|
|
|
|
ino = (group * fs->super->s_inodes_per_group) + 1;
|
|
|
|
for (i=0; i < fs->super->s_inodes_per_group; i++, ino++)
|
|
|
|
ext2fs_fast_unmark_inode_bitmap(map, ino);
|
|
|
|
|
|
|
|
fs->group_desc[group].bg_flags &= ~EXT2_BG_INODE_UNINIT;
|
|
|
|
check_block_uninit(fs, fs->block_map, group);
|
|
|
|
}
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
/*
|
|
|
|
* Right now, just search forward from the parent directory's block
|
|
|
|
* group to find the next free inode.
|
|
|
|
*
|
|
|
|
* Should have a special policy for directories.
|
|
|
|
*/
|
2008-08-28 07:07:54 +04:00
|
|
|
errcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir,
|
2003-12-07 09:28:50 +03:00
|
|
|
int mode EXT2FS_ATTR((unused)),
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
ext2fs_inode_bitmap map, ext2_ino_t *ret)
|
1997-04-26 17:21:57 +04:00
|
|
|
{
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
ext2_ino_t dir_group = 0;
|
|
|
|
ext2_ino_t i;
|
|
|
|
ext2_ino_t start_inode;
|
1997-04-26 17:21:57 +04:00
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
2008-08-28 07:07:54 +04:00
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (!map)
|
|
|
|
map = fs->inode_map;
|
|
|
|
if (!map)
|
|
|
|
return EXT2_ET_NO_INODE_BITMAP;
|
2008-08-28 07:07:54 +04:00
|
|
|
|
|
|
|
if (dir > 0)
|
1997-04-26 17:21:57 +04:00
|
|
|
dir_group = (dir - 1) / EXT2_INODES_PER_GROUP(fs->super);
|
|
|
|
|
|
|
|
start_inode = (dir_group * EXT2_INODES_PER_GROUP(fs->super)) + 1;
|
1997-04-26 18:48:50 +04:00
|
|
|
if (start_inode < EXT2_FIRST_INODE(fs->super))
|
|
|
|
start_inode = EXT2_FIRST_INODE(fs->super);
|
2009-01-22 23:55:49 +03:00
|
|
|
if (start_inode > fs->super->s_inodes_count)
|
|
|
|
return EXT2_ET_INODE_ALLOC_FAIL;
|
1997-04-26 17:21:57 +04:00
|
|
|
i = start_inode;
|
|
|
|
|
|
|
|
do {
|
2008-08-22 10:52:12 +04:00
|
|
|
if (((i - 1) % EXT2_INODES_PER_GROUP(fs->super)) == 0)
|
|
|
|
check_inode_uninit(fs, map, (i - 1) /
|
|
|
|
EXT2_INODES_PER_GROUP(fs->super));
|
|
|
|
|
2001-08-06 04:31:09 +04:00
|
|
|
if (!ext2fs_fast_test_inode_bitmap(map, i))
|
1997-04-26 17:21:57 +04:00
|
|
|
break;
|
|
|
|
i++;
|
|
|
|
if (i > fs->super->s_inodes_count)
|
1997-04-26 18:48:50 +04:00
|
|
|
i = EXT2_FIRST_INODE(fs->super);
|
1997-04-26 17:21:57 +04:00
|
|
|
} while (i != start_inode);
|
2008-08-28 07:07:54 +04:00
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
if (ext2fs_test_inode_bitmap(map, i))
|
1997-10-31 09:07:47 +03:00
|
|
|
return EXT2_ET_INODE_ALLOC_FAIL;
|
1997-04-26 17:21:57 +04:00
|
|
|
*ret = i;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Stupid algorithm --- we now just search forward starting from the
|
|
|
|
* goal. Should put in a smarter one someday....
|
|
|
|
*/
|
2009-06-02 00:15:40 +04:00
|
|
|
errcode_t ext2fs_new_block2(ext2_filsys fs, blk64_t goal,
|
|
|
|
ext2fs_block_bitmap map, blk64_t *ret)
|
1997-04-26 17:21:57 +04:00
|
|
|
{
|
2009-06-02 00:15:40 +04:00
|
|
|
blk64_t i;
|
1997-04-26 17:21:57 +04:00
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (!map)
|
|
|
|
map = fs->block_map;
|
|
|
|
if (!map)
|
|
|
|
return EXT2_ET_NO_BLOCK_BITMAP;
|
1997-04-30 01:26:48 +04:00
|
|
|
if (!goal || (goal >= fs->super->s_blocks_count))
|
|
|
|
goal = fs->super->s_first_data_block;
|
|
|
|
i = goal;
|
2008-08-22 10:52:12 +04:00
|
|
|
check_block_uninit(fs, map,
|
|
|
|
(i - fs->super->s_first_data_block) /
|
|
|
|
EXT2_BLOCKS_PER_GROUP(fs->super));
|
1997-04-26 17:21:57 +04:00
|
|
|
do {
|
2008-08-22 10:52:12 +04:00
|
|
|
if (((i - fs->super->s_first_data_block) %
|
|
|
|
EXT2_BLOCKS_PER_GROUP(fs->super)) == 0)
|
|
|
|
check_block_uninit(fs, map,
|
|
|
|
(i - fs->super->s_first_data_block) /
|
|
|
|
EXT2_BLOCKS_PER_GROUP(fs->super));
|
|
|
|
|
2009-06-02 00:15:40 +04:00
|
|
|
/* FIXME-64 */
|
|
|
|
if (!ext2fs_fast_test_block_bitmap(map, (blk_t) i)) {
|
1997-04-26 17:21:57 +04:00
|
|
|
*ret = i;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
i++;
|
1997-04-29 20:15:03 +04:00
|
|
|
if (i >= fs->super->s_blocks_count)
|
1997-04-26 17:21:57 +04:00
|
|
|
i = fs->super->s_first_data_block;
|
|
|
|
} while (i != goal);
|
1997-10-31 09:07:47 +03:00
|
|
|
return EXT2_ET_BLOCK_ALLOC_FAIL;
|
1997-10-25 08:16:53 +04:00
|
|
|
}
|
|
|
|
|
2009-06-02 00:15:40 +04:00
|
|
|
errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
|
|
|
|
ext2fs_block_bitmap map, blk_t *ret)
|
|
|
|
{
|
|
|
|
errcode_t retval;
|
|
|
|
blk64_t val;
|
|
|
|
retval = ext2fs_new_block2(fs, goal, map, &val);
|
|
|
|
if (!retval)
|
|
|
|
*ret = (blk_t) val;
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
1997-10-25 08:16:53 +04:00
|
|
|
/*
|
1997-10-26 02:37:42 +04:00
|
|
|
* This function zeros out the allocated block, and updates all of the
|
|
|
|
* appropriate filesystem records.
|
1997-10-25 08:16:53 +04:00
|
|
|
*/
|
2009-06-02 00:15:40 +04:00
|
|
|
errcode_t ext2fs_alloc_block2(ext2_filsys fs, blk64_t goal,
|
|
|
|
char *block_buf, blk64_t *ret)
|
1997-10-25 08:16:53 +04:00
|
|
|
{
|
|
|
|
errcode_t retval;
|
2009-06-02 00:15:40 +04:00
|
|
|
blk64_t block;
|
1997-10-26 02:37:42 +04:00
|
|
|
char *buf = 0;
|
|
|
|
|
|
|
|
if (!block_buf) {
|
2003-08-01 17:41:07 +04:00
|
|
|
retval = ext2fs_get_mem(fs->blocksize, &buf);
|
1997-10-26 06:41:24 +03:00
|
|
|
if (retval)
|
|
|
|
return retval;
|
1997-10-26 02:37:42 +04:00
|
|
|
block_buf = buf;
|
|
|
|
}
|
|
|
|
memset(block_buf, 0, fs->blocksize);
|
|
|
|
|
2008-06-03 01:21:37 +04:00
|
|
|
if (fs->get_alloc_block) {
|
2009-06-02 00:15:40 +04:00
|
|
|
retval = (fs->get_alloc_block)(fs, goal, &block);
|
1997-10-26 02:37:42 +04:00
|
|
|
if (retval)
|
|
|
|
goto fail;
|
2008-06-03 01:21:37 +04:00
|
|
|
} else {
|
|
|
|
if (!fs->block_map) {
|
2009-06-02 00:15:40 +04:00
|
|
|
/* FIXME-64 */
|
2008-06-03 01:21:37 +04:00
|
|
|
retval = ext2fs_read_block_bitmap(fs);
|
|
|
|
if (retval)
|
|
|
|
goto fail;
|
|
|
|
}
|
1997-10-26 02:37:42 +04:00
|
|
|
|
2009-06-02 00:15:40 +04:00
|
|
|
retval = ext2fs_new_block2(fs, goal, 0, &block);
|
2008-06-03 01:21:37 +04:00
|
|
|
if (retval)
|
|
|
|
goto fail;
|
|
|
|
}
|
1997-10-25 08:16:53 +04:00
|
|
|
|
2009-06-02 00:15:40 +04:00
|
|
|
retval = io_channel_write_blk64(fs->io, block, 1, block_buf);
|
1997-10-25 08:16:53 +04:00
|
|
|
if (retval)
|
1997-10-26 02:37:42 +04:00
|
|
|
goto fail;
|
2008-08-28 07:07:54 +04:00
|
|
|
|
2009-06-02 00:15:40 +04:00
|
|
|
ext2fs_block_alloc_stats2(fs, block, +1);
|
1997-10-26 02:37:42 +04:00
|
|
|
*ret = block;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
if (buf)
|
2003-08-01 17:41:07 +04:00
|
|
|
ext2fs_free_mem(&buf);
|
1997-10-26 02:37:42 +04:00
|
|
|
return retval;
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
|
|
|
|
2009-06-02 00:15:40 +04:00
|
|
|
errcode_t ext2fs_alloc_block(ext2_filsys fs, blk_t goal,
|
|
|
|
char *block_buf, blk_t *ret)
|
|
|
|
{
|
|
|
|
errcode_t retval;
|
|
|
|
blk64_t val;
|
|
|
|
retval = ext2fs_alloc_block2(fs, goal, block_buf, &val);
|
|
|
|
if (!retval)
|
|
|
|
*ret = (blk_t) val;
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
errcode_t ext2fs_get_free_blocks2(ext2_filsys fs, blk64_t start, blk64_t finish,
|
|
|
|
int num, ext2fs_block_bitmap map, blk64_t *ret)
|
1997-04-26 17:21:57 +04:00
|
|
|
{
|
2009-06-02 00:15:40 +04:00
|
|
|
blk64_t b = start;
|
1997-04-26 17:21:57 +04:00
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (!map)
|
|
|
|
map = fs->block_map;
|
|
|
|
if (!map)
|
|
|
|
return EXT2_ET_NO_BLOCK_BITMAP;
|
|
|
|
if (!b)
|
|
|
|
b = fs->super->s_first_data_block;
|
|
|
|
if (!finish)
|
|
|
|
finish = start;
|
|
|
|
if (!num)
|
|
|
|
num = 1;
|
|
|
|
do {
|
1997-04-29 20:15:03 +04:00
|
|
|
if (b+num-1 > fs->super->s_blocks_count)
|
|
|
|
b = fs->super->s_first_data_block;
|
2009-06-02 00:15:40 +04:00
|
|
|
/* FIXME-64 */
|
|
|
|
if (ext2fs_fast_test_block_bitmap_range(map, (blk_t) b,
|
|
|
|
(blk_t) num)) {
|
1997-04-26 17:21:57 +04:00
|
|
|
*ret = b;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
b++;
|
|
|
|
} while (b != finish);
|
1997-10-31 09:07:47 +03:00
|
|
|
return EXT2_ET_BLOCK_ALLOC_FAIL;
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
|
|
|
|
2009-06-02 00:15:40 +04:00
|
|
|
errcode_t ext2fs_get_free_blocks(ext2_filsys fs, blk_t start, blk_t finish,
|
|
|
|
int num, ext2fs_block_bitmap map, blk_t *ret)
|
|
|
|
{
|
|
|
|
errcode_t retval;
|
|
|
|
blk64_t val;
|
|
|
|
retval = ext2fs_get_free_blocks2(fs, start, finish, num, map, &val);
|
|
|
|
if(!retval)
|
|
|
|
*ret = (blk_t) val;
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2008-08-28 07:07:54 +04:00
|
|
|
void ext2fs_set_alloc_block_callback(ext2_filsys fs,
|
2008-06-03 01:21:37 +04:00
|
|
|
errcode_t (*func)(ext2_filsys fs,
|
|
|
|
blk64_t goal,
|
|
|
|
blk64_t *ret),
|
|
|
|
errcode_t (**old)(ext2_filsys fs,
|
|
|
|
blk64_t goal,
|
|
|
|
blk64_t *ret))
|
|
|
|
{
|
|
|
|
if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (old)
|
|
|
|
*old = fs->get_alloc_block;
|
|
|
|
|
|
|
|
fs->get_alloc_block = func;
|
|
|
|
}
|