/*
* alloc.c --- allocate new inodes, blocks for ext2fs
*
- * Copyright (C) 1993 Theodore Ts'o. This file may be redistributed
- * under the terms of the GNU Public License.
+ * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
*/
+#include "config.h"
#include <stdio.h>
+#if HAVE_UNISTD_H
#include <unistd.h>
-#include <stdlib.h>
+#endif
#include <time.h>
+#include <string.h>
+#if HAVE_SYS_STAT_H
#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
#include <sys/types.h>
-#if HAVE_ERRNO_H
-#include <errno.h>
#endif
-#include <linux/ext2_fs.h>
-
+#include "ext2_fs.h"
#include "ext2fs.h"
/*
+ * Check for uninit block bitmaps and deal with them appropriately
+ */
+static void check_block_uninit(ext2_filsys fs, ext2fs_block_bitmap map,
+ dgrp_t group)
+{
+ blk_t i;
+ blk64_t blk, super_blk, old_desc_blk, new_desc_blk;
+ int old_desc_blocks;
+
+ if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) ||
+ !(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
+ return;
+
+ blk = (group * fs->super->s_blocks_per_group) +
+ fs->super->s_first_data_block;
+
+ ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
+ &old_desc_blk, &new_desc_blk, 0);
+
+ 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++)
+ ext2fs_fast_unmark_block_bitmap2(map, blk);
+
+ blk = (group * fs->super->s_blocks_per_group) +
+ fs->super->s_first_data_block;
+ 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 == ext2fs_block_bitmap_loc(fs, group)) ||
+ (blk == ext2fs_inode_bitmap_loc(fs, group)) ||
+ (blk >= ext2fs_inode_table_loc(fs, group) &&
+ (blk < ext2fs_inode_table_loc(fs, group)
+ + fs->inode_blocks_per_group)))
+ ext2fs_fast_mark_block_bitmap2(map, blk);
+ }
+ ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
+ ext2fs_group_desc_csum_set(fs, group);
+}
+
+/*
+ * Check for uninit inode bitmaps and deal with them appropriately
+ */
+static void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map,
+ dgrp_t group)
+{
+ ext2_ino_t i, ino;
+
+ if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) ||
+ !(ext2fs_bg_flags_test(fs, group, 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_bitmap2(map, ino);
+
+ ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
+ check_block_uninit(fs, fs->block_map, group);
+}
+
+/*
* 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.
*/
-errcode_t ext2fs_new_inode(ext2_filsys fs, ino_t dir, int mode,
- ext2fs_inode_bitmap map, ino_t *ret)
+errcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir,
+ int mode EXT2FS_ATTR((unused)),
+ ext2fs_inode_bitmap map, ext2_ino_t *ret)
{
- int dir_group = 0;
- ino_t i;
- ino_t start_inode;
+ ext2_ino_t dir_group = 0;
+ ext2_ino_t i;
+ ext2_ino_t start_inode;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
-
+
if (!map)
map = fs->inode_map;
if (!map)
return EXT2_ET_NO_INODE_BITMAP;
-
- if (dir > 0)
+
+ if (dir > 0)
dir_group = (dir - 1) / EXT2_INODES_PER_GROUP(fs->super);
start_inode = (dir_group * EXT2_INODES_PER_GROUP(fs->super)) + 1;
if (start_inode < EXT2_FIRST_INODE(fs->super))
start_inode = EXT2_FIRST_INODE(fs->super);
+ if (start_inode > fs->super->s_inodes_count)
+ return EXT2_ET_INODE_ALLOC_FAIL;
i = start_inode;
do {
- if (!ext2fs_test_inode_bitmap(map, i))
+ if (((i - 1) % EXT2_INODES_PER_GROUP(fs->super)) == 0)
+ check_inode_uninit(fs, map, (i - 1) /
+ EXT2_INODES_PER_GROUP(fs->super));
+
+ if (!ext2fs_fast_test_inode_bitmap2(map, i))
break;
i++;
if (i > fs->super->s_inodes_count)
i = EXT2_FIRST_INODE(fs->super);
} while (i != start_inode);
-
- if (ext2fs_test_inode_bitmap(map, i))
- return ENOSPC;
+
+ if (ext2fs_test_inode_bitmap2(map, i))
+ return EXT2_ET_INODE_ALLOC_FAIL;
*ret = i;
return 0;
}
* Stupid algorithm --- we now just search forward starting from the
* goal. Should put in a smarter one someday....
*/
-errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
- ext2fs_block_bitmap map, blk_t *ret)
+errcode_t ext2fs_new_block2(ext2_filsys fs, blk64_t goal,
+ ext2fs_block_bitmap map, blk64_t *ret)
{
- blk_t i = goal;
+ blk64_t i;
+ int c_ratio;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
map = fs->block_map;
if (!map)
return EXT2_ET_NO_BLOCK_BITMAP;
- if (!i)
- i = fs->super->s_first_data_block;
+ if (!goal || (goal >= ext2fs_blocks_count(fs->super)))
+ goal = fs->super->s_first_data_block;
+ i = goal;
+ c_ratio = 1 << ext2fs_get_bitmap_granularity(map);
+ if (c_ratio > 1)
+ goal &= ~EXT2FS_CLUSTER_MASK(fs);
+ check_block_uninit(fs, map,
+ (i - fs->super->s_first_data_block) /
+ EXT2_BLOCKS_PER_GROUP(fs->super));
do {
- if (!ext2fs_test_block_bitmap(map, i)) {
+ 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));
+
+ if (!ext2fs_fast_test_block_bitmap2(map, i)) {
*ret = i;
return 0;
}
- i++;
- if (i > fs->super->s_blocks_count)
+ i = (i + c_ratio) & ~(c_ratio - 1);
+ if (i >= ext2fs_blocks_count(fs->super))
i = fs->super->s_first_data_block;
} while (i != goal);
- return ENOSPC;
+ return EXT2_ET_BLOCK_ALLOC_FAIL;
}
-static int check_blocks_free(ext2_filsys fs, ext2fs_block_bitmap map,
- blk_t blk, int num)
+errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
+ ext2fs_block_bitmap map, blk_t *ret)
{
- int i;
+ errcode_t retval;
+ blk64_t val;
+ retval = ext2fs_new_block2(fs, goal, map, &val);
+ if (!retval)
+ *ret = (blk_t) val;
+ return retval;
+}
- for (i=0; i < num; i++) {
- if ((blk+i) > fs->super->s_blocks_count)
- return 0;
- if (ext2fs_test_block_bitmap(map, blk+i))
- return 0;
+/*
+ * This function zeros out the allocated block, and updates all of the
+ * appropriate filesystem records.
+ */
+errcode_t ext2fs_alloc_block2(ext2_filsys fs, blk64_t goal,
+ char *block_buf, blk64_t *ret)
+{
+ errcode_t retval;
+ blk64_t block;
+ char *buf = 0;
+
+ if (!block_buf) {
+ retval = ext2fs_get_mem(fs->blocksize, &buf);
+ if (retval)
+ return retval;
+ block_buf = buf;
+ }
+ memset(block_buf, 0, fs->blocksize);
+
+ if (fs->get_alloc_block) {
+ retval = (fs->get_alloc_block)(fs, goal, &block);
+ if (retval)
+ goto fail;
+ } else {
+ if (!fs->block_map) {
+ retval = ext2fs_read_block_bitmap(fs);
+ if (retval)
+ goto fail;
+ }
+
+ retval = ext2fs_new_block2(fs, goal, 0, &block);
+ if (retval)
+ goto fail;
}
- return 1;
+
+ retval = io_channel_write_blk64(fs->io, block, 1, block_buf);
+ if (retval)
+ goto fail;
+
+ ext2fs_block_alloc_stats2(fs, block, +1);
+ *ret = block;
+
+fail:
+ if (buf)
+ ext2fs_free_mem(&buf);
+ return retval;
}
-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 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)
{
- blk_t b = start;
+ blk64_t b = start;
+ int c_ratio;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
finish = start;
if (!num)
num = 1;
+ c_ratio = 1 << ext2fs_get_bitmap_granularity(map);
+ b &= ~(c_ratio - 1);
+ finish &= ~(c_ratio -1);
do {
- if (check_blocks_free(fs, map, b, num)) {
+ if (b+num-1 > ext2fs_blocks_count(fs->super))
+ b = fs->super->s_first_data_block;
+ if (ext2fs_fast_test_block_bitmap_range2(map, b, num)) {
*ret = b;
return 0;
}
- b++;
- if (b > fs->super->s_blocks_count)
- b = fs->super->s_first_data_block;
+ b += c_ratio;
} while (b != finish);
- return ENOSPC;
+ return EXT2_ET_BLOCK_ALLOC_FAIL;
+}
+
+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;
}
+void ext2fs_set_alloc_block_callback(ext2_filsys fs,
+ 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;
+}
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff