1997-04-26 17:21:57 +04:00
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/*
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* alloc.c --- allocate new inodes, blocks for ext2fs
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*
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1997-04-29 20:15:03 +04:00
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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 Public
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* License.
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* %End-Header%
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*
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1997-04-26 17:21:57 +04:00
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*/
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#include <stdio.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 17:21:57 +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 17:21:57 +04:00
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#include <time.h>
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1997-10-26 02:37:42 +04:00
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#include <string.h>
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1997-10-20 03:00:21 +04:00
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#if HAVE_SYS_STAT_H
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1997-04-26 17:21:57 +04:00
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#include <sys/stat.h>
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1997-10-20 03:00:21 +04:00
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#endif
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#if HAVE_SYS_TYPES_H
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1997-04-26 17:21:57 +04:00
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#include <sys/types.h>
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1997-10-20 03:00:21 +04:00
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#endif
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1997-04-26 17:21:57 +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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#if EXT2_FLAT_INCLUDES
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#include "ext2_fs.h"
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#else
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1997-04-26 17:21:57 +04:00
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#include <linux/ext2_fs.h>
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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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#endif
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1997-04-26 17:21:57 +04:00
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#include "ext2fs.h"
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/*
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* Right now, just search forward from the parent directory's block
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* group to find the next free inode.
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*
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* Should have a special policy for directories.
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*/
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1997-04-26 17:34:30 +04:00
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errcode_t ext2fs_new_inode(ext2_filsys fs, ino_t dir, int mode,
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ext2fs_inode_bitmap map, ino_t *ret)
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1997-04-26 17:21:57 +04:00
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{
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1997-08-11 03:07:40 +04:00
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ino_t dir_group = 0;
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1997-04-26 17:21:57 +04:00
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ino_t i;
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ino_t start_inode;
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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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1997-04-26 17:21:57 +04:00
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if (!map)
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map = fs->inode_map;
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if (!map)
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return EXT2_ET_NO_INODE_BITMAP;
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if (dir > 0)
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dir_group = (dir - 1) / EXT2_INODES_PER_GROUP(fs->super);
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start_inode = (dir_group * EXT2_INODES_PER_GROUP(fs->super)) + 1;
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1997-04-26 18:48:50 +04:00
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if (start_inode < EXT2_FIRST_INODE(fs->super))
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start_inode = EXT2_FIRST_INODE(fs->super);
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1997-04-26 17:21:57 +04:00
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i = start_inode;
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do {
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1997-04-26 17:34:30 +04:00
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if (!ext2fs_test_inode_bitmap(map, i))
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1997-04-26 17:21:57 +04:00
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break;
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i++;
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if (i > fs->super->s_inodes_count)
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1997-04-26 18:48:50 +04:00
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i = EXT2_FIRST_INODE(fs->super);
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1997-04-26 17:21:57 +04:00
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} while (i != start_inode);
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1997-04-26 17:34:30 +04:00
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if (ext2fs_test_inode_bitmap(map, i))
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1997-10-31 09:07:47 +03:00
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return EXT2_ET_INODE_ALLOC_FAIL;
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1997-04-26 17:21:57 +04:00
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*ret = i;
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return 0;
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}
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/*
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* Stupid algorithm --- we now just search forward starting from the
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* goal. Should put in a smarter one someday....
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*/
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1997-04-26 17:34:30 +04:00
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errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
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ext2fs_block_bitmap map, blk_t *ret)
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1997-04-26 17:21:57 +04:00
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{
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1997-04-30 01:26:48 +04:00
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blk_t i;
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:21:57 +04:00
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if (!map)
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map = fs->block_map;
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if (!map)
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return EXT2_ET_NO_BLOCK_BITMAP;
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1997-04-30 01:26:48 +04:00
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if (!goal || (goal >= fs->super->s_blocks_count))
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goal = fs->super->s_first_data_block;
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i = goal;
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1997-04-26 17:21:57 +04:00
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do {
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1997-04-26 17:34:30 +04:00
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if (!ext2fs_test_block_bitmap(map, i)) {
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1997-04-26 17:21:57 +04:00
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*ret = i;
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return 0;
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}
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i++;
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1997-04-29 20:15:03 +04:00
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if (i >= fs->super->s_blocks_count)
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1997-04-26 17:21:57 +04:00
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i = fs->super->s_first_data_block;
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} while (i != goal);
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1997-10-31 09:07:47 +03:00
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return EXT2_ET_BLOCK_ALLOC_FAIL;
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1997-10-25 08:16:53 +04:00
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}
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/*
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1997-10-26 02:37:42 +04:00
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* This function zeros out the allocated block, and updates all of the
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* appropriate filesystem records.
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1997-10-25 08:16:53 +04:00
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*/
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1997-10-26 02:37:42 +04:00
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errcode_t ext2fs_alloc_block(ext2_filsys fs, blk_t goal,
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char *block_buf, blk_t *ret)
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1997-10-25 08:16:53 +04:00
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{
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errcode_t retval;
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1997-10-26 02:37:42 +04:00
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blk_t block;
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1997-10-25 08:16:53 +04:00
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int group;
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1997-10-26 02:37:42 +04:00
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char *buf = 0;
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if (!block_buf) {
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1997-10-26 06:41:24 +03:00
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retval = ext2fs_get_mem(fs->blocksize, (void **) &buf);
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if (retval)
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return retval;
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1997-10-26 02:37:42 +04:00
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block_buf = buf;
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}
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memset(block_buf, 0, fs->blocksize);
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if (!fs->block_map) {
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retval = ext2fs_read_block_bitmap(fs);
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if (retval)
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goto fail;
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}
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retval = ext2fs_new_block(fs, goal, 0, &block);
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if (retval)
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goto fail;
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1997-10-25 08:16:53 +04:00
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1997-10-26 02:37:42 +04:00
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retval = io_channel_write_blk(fs->io, block, 1, block_buf);
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1997-10-25 08:16:53 +04:00
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if (retval)
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1997-10-26 02:37:42 +04:00
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goto fail;
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1997-10-25 08:16:53 +04:00
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fs->super->s_free_blocks_count--;
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1997-10-26 02:37:42 +04:00
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group = ext2fs_group_of_blk(fs, block);
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1997-10-25 08:16:53 +04:00
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fs->group_desc[group].bg_free_blocks_count--;
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1997-10-26 02:37:42 +04:00
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ext2fs_mark_block_bitmap(fs->block_map, block);
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1997-10-25 08:16:53 +04:00
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ext2fs_mark_super_dirty(fs);
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ext2fs_mark_bb_dirty(fs);
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1997-10-26 02:37:42 +04:00
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*ret = block;
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1997-10-25 08:16:53 +04:00
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return 0;
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1997-10-26 02:37:42 +04:00
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fail:
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if (buf)
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1997-10-26 06:41:24 +03:00
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ext2fs_free_mem((void **) &buf);
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1997-10-26 02:37:42 +04:00
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return retval;
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1997-04-26 17:21:57 +04:00
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}
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errcode_t ext2fs_get_free_blocks(ext2_filsys fs, blk_t start, blk_t finish,
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1997-04-26 17:34:30 +04:00
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int num, ext2fs_block_bitmap map, blk_t *ret)
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1997-04-26 17:21:57 +04:00
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{
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blk_t b = start;
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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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1997-04-26 17:21:57 +04:00
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if (!map)
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map = fs->block_map;
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if (!map)
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return EXT2_ET_NO_BLOCK_BITMAP;
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if (!b)
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b = fs->super->s_first_data_block;
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if (!finish)
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finish = start;
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if (!num)
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num = 1;
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do {
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1997-04-29 20:15:03 +04:00
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if (b+num-1 > fs->super->s_blocks_count)
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b = fs->super->s_first_data_block;
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if (ext2fs_fast_test_block_bitmap_range(map, b, num)) {
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1997-04-26 17:21:57 +04:00
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*ret = b;
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return 0;
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}
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b++;
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} while (b != finish);
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1997-10-31 09:07:47 +03:00
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return EXT2_ET_BLOCK_ALLOC_FAIL;
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1997-04-26 17:21:57 +04:00
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}
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