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ext4-realloc-inodes/realloc-inodes.c

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/**
* A tool for ext2/ext3/ext4 filesystems that allows to change inode count
* without recreating the FS.
*
* Copyright (c) Vitaliy Filippov <vitalif@mail.ru> 2013+
* License: GNU GPLv2 or later
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* TODO try to not fragment the journal while moving
*
* The theory isn't that hard:
* 1) Determine where we want to move the inode tables:
* 1.1) Create a map of non-movable blocks - these are: superblock & group descriptors,
* block bitmaps, inode bitmaps, bad blocks, and blocks in the resize inode.
* Otherwise speaking, we can move any block that either belongs to inode table
* or belongs to any inode other than the resize or bad blocks inode.
* 1.2) Using the created map, find place for each group inode table closest to the beginning
* of its flex_bg. Save these locations in memory.
* 1.3) Free the map.
* 2) Only if shrinking: move inodes away from the end of each block group inode table
* 2.1) move each inode to the new place, mark new place as occupied, unmark old one
* 2.2) remember the old->new inode number mapping
* 3) Move data away from extra blocks needed by growing/moved inode tables:
* 3.2) Create a map of blocks that we want to free.
* 3.3) Iterate through all inodes and move blocks. It may involve overwriting
* the whole file extent tree or block mapping.
* 4) Change all inode numbers in directory entries according to mappings from (1.2),
* and then using a formula: new_num = 1 + ((old_num-1)/old_i_per_g)*new_i_per_g + ((old_num-1) % old_i_per_g)
* 5) Move inode tables.
* 6) Unmark old inode table blocks, mark new ones.
* 7) Change block group descriptors: bg_inode_table, bg_free_inodes_count,
* bg_free_blocks_count, bg_inode_bitmap_csum, bg_itable_unused
* 8) Change superblock: s_inodes_count, s_free_blocks_count,
* s_free_inodes_count, s_inodes_per_group
*
* This is a highly destructive process and WILL leave a corrupted FS if interrupted.
* So we should provide a rollback method. undo_io_manager is very slow, so instead of it
* we use the "patch" i/o manager that first does not modify the filesystem directly, but
* only writes changed blocks to a separate sparse "patch" file.
*
* The modifications can then be applied to the real filesystem using e2patch utility,
* and if that process gets interrupted you can safely restart it and still get a consistent
* filesystem state.
*
* Moreover, you can create an "undo" ("backup") patch before applying modifications,
* also using e2patch utility.
*/
/**
* Need tests for:
* - both ext2 and ext4 filesystem images
* - inode moving: FS image with many files
* - block moving, including extent blocks: big sparse file with many extents
* - block moving between different groups
* - reallocation (both shrink and grow) in case of big flex_bg when inode
* tables don't fit into single block group
* - non-optimal reallocation, i.e. when inode block count doesn't change
* - reallocation on a bigalloc filesystem
*/
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <errno.h>
#include <ext2fs/ext2_fs.h>
#include <ext2fs/ext2fs.h>
#include "bmove.h"
#include "check_uninit.h"
#include "patch_io.h"
#define _(a) (a)
#define min(a,b) ((a)<(b)?(a):(b))
// Check our own feature sets for the case of linking with newer libext2fs
#define REALLOC_FEATURE_COMPAT_SUPP \
(EXT2_FEATURE_COMPAT_DIR_PREALLOC|\
EXT2_FEATURE_COMPAT_IMAGIC_INODES|\
EXT3_FEATURE_COMPAT_HAS_JOURNAL|\
EXT2_FEATURE_COMPAT_RESIZE_INODE|\
EXT2_FEATURE_COMPAT_DIR_INDEX|\
EXT2_FEATURE_COMPAT_EXT_ATTR)
// 'journal_dev' and 'recover' incompat features are unsupported
#define REALLOC_FEATURE_INCOMPAT_SUPP \
(EXT2_FEATURE_INCOMPAT_FILETYPE|\
EXT2_FEATURE_INCOMPAT_COMPRESSION|\
EXT2_FEATURE_INCOMPAT_META_BG|\
EXT3_FEATURE_INCOMPAT_EXTENTS|\
EXT4_FEATURE_INCOMPAT_FLEX_BG|\
EXT4_FEATURE_INCOMPAT_MMP|\
EXT4_FEATURE_INCOMPAT_64BIT)
#define REALLOC_FEATURE_RO_COMPAT_SUPP \
(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
EXT4_FEATURE_RO_COMPAT_HUGE_FILE|\
EXT2_FEATURE_RO_COMPAT_LARGE_FILE|\
EXT4_FEATURE_RO_COMPAT_DIR_NLINK|\
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE|\
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
EXT4_FEATURE_RO_COMPAT_GDT_CSUM|\
EXT4_FEATURE_RO_COMPAT_BIGALLOC|\
EXT4_FEATURE_RO_COMPAT_QUOTA)
// "local data" for the inode reallocation process
typedef struct
{
ext2_filsys fs;
int fs_fd;
dgrp_t flexbg_size, flex_count;
char *device_name, *io_options, *patch_file;
__u32 ig_old, ig_new; // old and new inodes-per-group count
__u32 ibg_old, ibg_new; // old and new inode_blocks-per-group count
__u32 new_inode_count;
blk64_t *new_itable_loc;
// (old->new) inode number map
ext2_ino_t *inode_map;
__u32 inode_map_size, inode_map_alloc;
} realloc_data;
// Utility functions for (old -> new) inode number map
void realloc_add_inode_map(realloc_data *rd, ext2_ino_t old, ext2_ino_t new)
{
if (!old || !new)
{
return;
}
if (2*rd->inode_map_size >= rd->inode_map_alloc)
{
rd->inode_map_alloc += 1024;
rd->inode_map = realloc(rd->inode_map, sizeof(ext2_ino_t) * rd->inode_map_alloc);
}
rd->inode_map[rd->inode_map_size*2] = old;
rd->inode_map[rd->inode_map_size*2+1] = new;
rd->inode_map_size++;
}
int realloc_compare_inode_map_callback(const void *a, const void *b)
{
return *((ext2_ino_t*)a) - *((ext2_ino_t*)b);
}
void realloc_sort_inode_map(realloc_data *rd)
{
if (!rd->inode_map)
{
return;
}
qsort(rd->inode_map, rd->inode_map_size, sizeof(ext2_ino_t)*2, realloc_compare_inode_map_callback);
}
ext2_ino_t realloc_search_inode_map(realloc_data *rd, ext2_ino_t old)
{
__u32 start = 0, end = rd->inode_map_size, cur;
ext2_ino_t cur_ino;
if (!rd->inode_map)
{
return 0;
}
while (end-start > 1)
{
cur = (start+end)>>1;
cur_ino = rd->inode_map[cur<<1];
if (cur_ino < old)
{
start = cur+1;
}
else if (cur_ino > old)
{
end = cur;
}
else
{
return rd->inode_map[(cur<<1)+1];
}
}
if (rd->inode_map[start<<1] == old)
{
return rd->inode_map[(start<<1)+1];
}
return 0;
}
/* Rewrite extents */
static errcode_t rewrite_extents(ext2_filsys fs, ext2_ino_t ino)
{
ext2_extent_handle_t handle;
struct ext2fs_extent extent;
errcode_t errcode;
struct ext2_extent_info info;
errcode = ext2fs_extent_open(fs, ino, &handle);
if (errcode)
return errcode;
errcode = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent);
if (errcode)
goto out;
do {
errcode = ext2fs_extent_get_info(handle, &info);
if (errcode)
break;
/*
* If this is the first extent in an extent block that we
* haven't visited, rewrite the extent to force the ETB
* checksum to be rewritten.
*/
if (info.curr_entry == 1 && info.curr_level != 0 &&
!(extent.e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT)) {
errcode = ext2fs_extent_replace(handle, 0, &extent);
if (errcode)
break;
}
/* Skip to the end of a block of leaf nodes */
if (extent.e_flags & EXT2_EXTENT_FLAGS_LEAF) {
errcode = ext2fs_extent_get(handle,
EXT2_EXTENT_LAST_SIB,
&extent);
if (errcode)
break;
}
errcode = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT, &extent);
} while (errcode == 0);
out:
/* Ok if we run off the end */
if (errcode == EXT2_ET_EXTENT_NO_NEXT)
errcode = 0;
ext2fs_extent_free(handle);
return errcode;
}
/**
* Move inodes from the end of each block group inode table
* so the tables can be shrinked
*/
errcode_t shrink_move_inodes(realloc_data *rd)
{
errcode_t retval = 0;
int inode_size = EXT2_INODE_SIZE(rd->fs->super);
__u32 group, i;
__u32 new_group;
ext2_ino_t ino, new_ino;
struct ext2_inode *inode = NULL;
if (retval)
{
return retval;
}
retval = ext2fs_get_mem(inode_size, &inode);
if (retval)
{
return retval;
}
for (group = 0; group < rd->fs->group_desc_count; group++)
{
for (i = rd->ig_new; i < rd->ig_old; i++)
{
ino = 1 + group*rd->ig_old + i;
if (ext2fs_test_inode_bitmap2(rd->fs->inode_map, ino))
{
// Inode is occupied and should be moved
new_group = group;
do
{
retval = ext2fs_find_first_zero_inode_bitmap2(rd->fs->inode_map,
1 + new_group*rd->ig_old,
new_group*rd->ig_old+rd->ig_new, &new_ino);
if (!retval)
{
break;
}
new_group = (new_group+1) % rd->fs->group_desc_count;
} while (new_group != group);
if (retval)
{
// No space to move this inode
goto out;
}
// Copy inode to the new place
check_inode_uninit(rd->fs, rd->fs->inode_map, new_group);
retval = ext2fs_read_inode_full(rd->fs, ino, inode, inode_size);
if (retval)
{
goto out;
}
retval = ext2fs_write_inode_full(rd->fs, new_ino, inode, inode_size);
if (retval)
{
goto out;
}
ext2fs_inode_alloc_stats2(rd->fs, new_ino, 1, inode->i_mode & S_IFDIR);
ext2fs_inode_alloc_stats2(rd->fs, ino, -1, inode->i_mode & S_IFDIR);
/* Rewrite extent block checksums with new inode number */
if (ext2fs_has_feature_metadata_csum(rd->fs->super) &&
(inode->i_flags & EXT4_EXTENTS_FL)) {
rd->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
retval = rewrite_extents(rd->fs, new_ino);
rd->fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
if (retval)
goto out;
}
// Remember mapping
realloc_add_inode_map(rd, ino, new_ino);
}
}
}
if (rd->inode_map_size)
{
ext2fs_mark_ib_dirty(rd->fs);
}
out:
if (inode)
{
ext2fs_free_mem(&inode);
}
return retval;
}
/**
* Move data blocks from the new place for each block group inode table
* so the tables can be grown or moved.
*/
errcode_t extend_move_blocks(realloc_data *rd)
{
ext2fs_block_bitmap reserve_map;
dgrp_t grp;
errcode_t retval;
if (rd->ibg_new == rd->ibg_old)
{
return 0;
}
retval = ext2fs_allocate_block_bitmap(rd->fs, "reserved block map", &reserve_map);
if (retval)
{
return retval;
}
// Mark blocks we want to free as "reserved"
// Don't care about which blocks are already used by inode tables,
// because ext2fs_move_blocks only moves blocks that belong to inodes.
for (grp = 0; grp < rd->fs->group_desc_count; grp++)
{
ext2fs_mark_block_bitmap_range2(reserve_map, rd->new_itable_loc[grp], rd->ibg_new);
}
retval = ext2fs_move_blocks(rd->fs, reserve_map, rd->fs->block_map, 0);
ext2fs_mark_bb_dirty(rd->fs);
ext2fs_flush(rd->fs);
ext2fs_free_block_bitmap(reserve_map);
return retval;
}
static int change_inode_numbers_callback(ext2_ino_t dir, int entry,
struct ext2_dir_entry *dirent, int offset,
int blocksize, char *buf, void *priv_data)
{
realloc_data *rd = priv_data;
ext2_ino_t new_ino = realloc_search_inode_map(rd, dirent->inode);
if (!new_ino)
{
new_ino = dirent->inode;
}
new_ino = 1 + (new_ino-1)/rd->ig_old*rd->ig_new + (new_ino-1)%rd->ig_old;
if (new_ino != dirent->inode)
{
dirent->inode = new_ino;
return DIRENT_CHANGED;
}
return 0;
}
static int fix_dirent_csum_callback(ext2_ino_t dir, int entry,
struct ext2_dir_entry *dirent, int offset,
int blocksize, char *buf, void *priv_data)
{
realloc_data *rd = priv_data;
ext2fs_dir_block_csum_set(rd->fs, dir, dirent);
return DIRENT_CHANGED;
}
/**
* Change inode numbers in all directory entries
*/
errcode_t change_inode_numbers(realloc_data *rd)
{
ext2_ino_t ino;
realloc_sort_inode_map(rd);
for (ino = 1; ino <= rd->fs->super->s_inodes_count; ino++)
{
if (ext2fs_test_inode_bitmap2(rd->fs->inode_map, ino))
{
ext2fs_dir_iterate2(rd->fs, ino, 0, 0, change_inode_numbers_callback, rd);
}
}
return 0;
}
errcode_t fix_dirent_csums(realloc_data *rd)
{
ext2_ino_t ino;
realloc_sort_inode_map(rd);
for (ino = 1; ino <= rd->fs->super->s_inodes_count; ino++)
{
if (ext2fs_test_inode_bitmap2(rd->fs->inode_map, ino))
{
ext2fs_dir_iterate2(rd->fs, ino, 0, 0, fix_dirent_csum_callback, rd);
}
}
return 0;
}
/**
* 1) Move inode tables
* 2) Mark/unmark new/old inode table blocks
* 3) Adjust superblock and block group descriptors
*/
errcode_t change_super_and_bgd(realloc_data *rd)
{
blk64_t blk, end;
dgrp_t grp, n_grp, flex_grp;
__u32 used_ig, used_ibg, i, unus;
ext2_ino_t inum;
errcode_t retval = 0;
int has_gdt_csum = EXT2_HAS_RO_COMPAT_FEATURE(rd->fs->super, EXT4_FEATURE_RO_COMPAT_GDT_CSUM|EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
int cl = EXT2FS_CLUSTER_RATIO(rd->fs);
void *buf = NULL, *inode_buf = NULL;
ext2fs_flush(rd->fs);
retval = ext2fs_get_mem(EXT2_BLOCK_SIZE(rd->fs->super) * rd->ibg_new * rd->flexbg_size, &buf);
if (retval)
{
goto out;
}
// First mark/unmark inode table blocks (mark and unmark in separate passes)
for (grp = 0; grp < rd->fs->group_desc_count; grp++)
{
// In case of bigalloc, last cluster of previous group inode table
// may often overlap with the first cluster of next group one
blk = ext2fs_inode_table_loc(rd->fs, grp) & ~(cl-1);
if (!ext2fs_test_block_bitmap2(rd->fs->block_map, blk))
{
blk += cl;
}
end = (ext2fs_inode_table_loc(rd->fs, grp) + rd->ibg_old + (cl-1)) & ~(cl-1);
for (; blk < end; blk += cl)
{
ext2fs_block_alloc_stats2(rd->fs, blk, -1);
}
}
for (grp = 0; grp < rd->fs->group_desc_count; grp++)
{
blk = rd->new_itable_loc[grp] & ~(cl-1);
if (grp > 0 && blk == end-cl)
{
blk += cl;
}
end = (rd->new_itable_loc[grp] + rd->ibg_new + (cl-1)) & ~(cl-1);
for (; blk < end; blk += cl)
{
if (ext2fs_test_block_bitmap2(rd->fs->block_map, blk))
{
printf("BUG: Block %lld (suited for group %u inode table) is still allocated\n", blk, grp);
retval = ENOSPC;
goto out;
}
ext2fs_block_alloc_stats2(rd->fs, blk, +1);
}
}
for (flex_grp = 0; flex_grp < rd->flex_count; flex_grp++)
{
// Read inode tables for a flex_bg
grp = flex_grp*rd->flexbg_size;
n_grp = min(rd->flexbg_size, rd->fs->group_desc_count-grp);
for (i = 0; i < n_grp; i++, grp++)
{
// Skip unitialized inode table parts
used_ibg = rd->ibg_old;
used_ig = rd->ig_old;
if (has_gdt_csum)
{
if (ext2fs_bg_flags_test(rd->fs, grp, EXT2_BG_INODE_UNINIT))
{
used_ig = used_ibg = 0;
}
else
{
used_ig = (rd->ig_old - ext2fs_bg_itable_unused(rd->fs, grp));
used_ibg = (used_ig * EXT2_INODE_SIZE(rd->fs->super)+EXT2_BLOCK_SIZE(rd->fs->super)-1)/EXT2_BLOCK_SIZE(rd->fs->super);
}
}
blk = ext2fs_inode_table_loc(rd->fs, grp);
if (used_ibg > 0)
{
inode_buf = buf + i*rd->ibg_new*EXT2_BLOCK_SIZE(rd->fs->super);
retval = io_channel_read_blk64(rd->fs->io, blk, min(used_ibg, rd->ibg_new), inode_buf);
if (retval)
goto out;
if (used_ig < rd->ig_new)
{
memset(inode_buf + EXT2_INODE_SIZE(rd->fs->super) * used_ig,
0, EXT2_INODE_SIZE(rd->fs->super) * (rd->ig_new - used_ig));
}
if (ext2fs_has_feature_metadata_csum(rd->fs->super))
{
for (inum = 0; inum < used_ig || inum < rd->ig_new; inum++)
{
retval = ext2fs_inode_csum_set(
rd->fs, 1 + rd->ig_new*grp + inum,
inode_buf + EXT2_INODE_SIZE(rd->fs->super) * inum
);
if (retval)
goto out;
}
}
}
}
// Write inode tables
grp = flex_grp*rd->flexbg_size;
for (i = 0; i < n_grp; i++, grp++)
{
retval = io_channel_write_blk64(rd->fs->io, rd->new_itable_loc[grp], rd->ibg_new,
buf + i*rd->ibg_new*EXT2_BLOCK_SIZE(rd->fs->super));
if (retval)
{
printf("Error moving inode table for block group %u\n", grp);
goto out;
}
// Set inode table location and free inode count
ext2fs_inode_table_loc_set(rd->fs, grp, rd->new_itable_loc[grp]);
ext2fs_bg_free_inodes_count_set(rd->fs, grp,
ext2fs_bg_free_inodes_count(rd->fs, grp) + rd->ig_new - rd->ig_old);
if (has_gdt_csum)
{
unus = ext2fs_bg_itable_unused(rd->fs, grp);
if (rd->ig_new > rd->ig_old || unus >= rd->ig_old - rd->ig_new)
{
unus += rd->ig_new - rd->ig_old;
}
else
{
unus = 0;
}
ext2fs_bg_itable_unused_set(rd->fs, grp, unus);
ext2fs_group_desc_csum_set(rd->fs, grp);
}
}
}
// Bitmaps never need to be moved because a single bitmap is always a single FS block
ext2fs_mark_bb_dirty(rd->fs);
retval = rd->fs->write_bitmaps(rd->fs);
if (retval)
{
goto out;
}
rd->fs->write_bitmaps = NULL;
// Explicitly set 'overwrite backup superblocks' flag
rd->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
rd->fs->super->s_free_inodes_count += rd->fs->group_desc_count * (rd->ig_new - rd->ig_old);
rd->fs->super->s_inodes_per_group = rd->ig_new;
rd->fs->super->s_inodes_count = rd->fs->group_desc_count * rd->ig_new;
ext2fs_mark_super_dirty(rd->fs);
if (rd->ig_new > rd->ig_old)
{
// Mark newly allocated inodes as free in the bitmap
__u32 ino;
ext2fs_read_inode_bitmap(rd->fs);
for (grp = 0; grp < rd->fs->group_desc_count; grp++)
{
for (ino = rd->ig_old; ino < rd->ig_new; ino++)
{
ext2fs_unmark_inode_bitmap2(rd->fs->inode_map, 1 + ino + grp*rd->ig_new);
}
}
ext2fs_mark_ib_dirty(rd->fs);
}
out:
if (buf)
{
ext2fs_free_mem(&buf);
}
return retval;
}
int nonmovable_callback(ext2_filsys fs, blk64_t *blocknr, e2_blkcnt_t blockcnt, blk64_t ref_blk, int ref_offset, void *priv_data)
{
if (blockcnt >= 0)
{
ext2fs_mark_block_bitmap2((ext2fs_block_bitmap)priv_data, *blocknr);
}
return 0;
}
/**
* Allocate new place for all groups' inode tables and remember it.
* This is more correct, because allows us to correctly handle situations
* when flex_bg is so big that inode tables for all groups in flex_bg
* do not fit into its first group, and also allows us to honor bad blocks.
*/
errcode_t alloc_itables(realloc_data *rd)
{
errcode_t retval = 0;
ext2fs_block_bitmap nonmovable = NULL;
dgrp_t grp, flex_grp;
int n_grp, i, mod;
blk64_t blk, start, end;
retval = ext2fs_get_mem(sizeof(blk64_t) * rd->fs->group_desc_count, &rd->new_itable_loc);
if (retval)
goto out;
// Create a map of blocks we can't move
retval = ext2fs_allocate_block_bitmap(rd->fs, "non-movable block bitmap", &nonmovable);
if (retval < 0)
goto out;
retval = ext2fs_block_iterate3(rd->fs, EXT2_BAD_INO, 0, NULL, nonmovable_callback, nonmovable);
if (retval < 0)
goto out;
retval = ext2fs_block_iterate3(rd->fs, EXT2_RESIZE_INO, 0, NULL, nonmovable_callback, nonmovable);
if (retval < 0)
goto out;
for (grp = 0; grp < rd->fs->group_desc_count; grp++)
{
ext2fs_reserve_super_and_bgd(rd->fs, grp, nonmovable);
ext2fs_mark_block_bitmap2(nonmovable, ext2fs_block_bitmap_loc(rd->fs, grp));
ext2fs_mark_block_bitmap2(nonmovable, ext2fs_inode_bitmap_loc(rd->fs, grp));
}
// flex_bg parameters
if (EXT2_HAS_INCOMPAT_FEATURE(rd->fs->super, EXT4_FEATURE_INCOMPAT_FLEX_BG)
&& rd->fs->super->s_log_groups_per_flex)
{
rd->flexbg_size = 1 << rd->fs->super->s_log_groups_per_flex;
}
else
{
rd->flexbg_size = 1;
}
rd->flex_count = (rd->fs->group_desc_count + rd->flexbg_size - 1) / rd->flexbg_size;
// Allocate inode tables
for (flex_grp = 0; flex_grp < rd->flex_count; flex_grp++)
{
grp = flex_grp*rd->flexbg_size;
n_grp = min(rd->flexbg_size, rd->fs->group_desc_count-grp);
// TODO We could use a better algorithm that would always try to find
// the biggest free sequence of blocks if it can't allocate all inode
// tables in sequence
start = ext2fs_group_first_block2(rd->fs, grp);
end = ext2fs_group_last_block2(rd->fs, grp+n_grp-1);
mod = 0;
for (i = 0; i < n_grp; i++, grp++)
{
retval = ext2fs_get_free_blocks2(rd->fs, start, end, rd->ibg_new, nonmovable, &blk);
if (retval)
goto out;
if (start == blk)
blk += mod;
rd->new_itable_loc[grp] = blk;
start = blk + rd->ibg_new;
// Allow adjacent inode tables to share one cluster
// ext2fs_get_free_blocks2 operates on cluster boundaries,
// so we handle the division residue separately
mod = start & EXT2FS_CLUSTER_MASK(rd->fs);
start = start - mod;
}
}
out:
if (nonmovable)
ext2fs_free_block_bitmap(nonmovable);
return retval;
}
/**
* Main function: change inode number of a filesystem!
*/
errcode_t do_realloc(realloc_data *rd)
{
__u32 ig_round;
errcode_t retval;
int phase = 1;
rd->ig_old = EXT2_INODES_PER_GROUP(rd->fs->super);
rd->ig_new = rd->new_inode_count / rd->fs->group_desc_count;
// inodes-per-group must be a multiple of 8 so each byte of inode bitmap is filled
rd->ig_new &= ~7;
if (rd->ig_new < 16)
{
printf("Too small number of inodes requested (%u), min inodes per group = 16\n", rd->ig_new);
retval = EINVAL;
goto out;
}
rd->ibg_old = rd->fs->inode_blocks_per_group;
rd->ibg_new = (rd->ig_new * EXT2_INODE_SIZE(rd->fs->super) +
EXT2_BLOCK_SIZE(rd->fs->super) - 1) / EXT2_BLOCK_SIZE(rd->fs->super);
if (rd->new_inode_count != rd->ig_new * rd->fs->group_desc_count)
{
printf("Inode count %u rounded down to %u = (%u inodes per group) * (%u block groups)\n",
rd->new_inode_count, rd->ig_new * rd->fs->group_desc_count, rd->ig_new, rd->fs->group_desc_count);
}
rd->new_inode_count = rd->ig_new * rd->fs->group_desc_count;
ig_round = rd->ibg_new * EXT2_BLOCK_SIZE(rd->fs->super) / EXT2_INODE_SIZE(rd->fs->super);
if (rd->ig_new != ig_round)
{
printf("Inode count %u is not optimal because %u inodes per group is not a multiple of %u"
" - there will be wasted space in inode tables. Optimal inode count would be %u.\n",
rd->new_inode_count, rd->ig_new, EXT2_BLOCK_SIZE(rd->fs->super) / EXT2_INODE_SIZE(rd->fs->super), ig_round);
}
ext2fs_read_bitmaps(rd->fs);
// Find where to put the new inode tables
retval = alloc_itables(rd);
if (retval)
{
goto out;
}
if (rd->ig_new < rd->ig_old)
{
if (rd->new_inode_count < rd->fs->super->s_inodes_count - rd->fs->super->s_free_inodes_count)
{
printf("Too small number of inodes requested, existing inodes (%u) won't fit\n",
rd->fs->super->s_inodes_count - rd->fs->super->s_free_inodes_count);
retval = ENOSPC;
goto out;
}
printf("Phase %d: Moving inodes out of the way\n", phase++);
retval = shrink_move_inodes(rd);
if (retval)
{
goto out;
}
}
else if (rd->ig_new > rd->ig_old)
{
blk64_t required_blocks = (rd->ibg_new - rd->ibg_old) * rd->fs->group_desc_count;
if (required_blocks > ext2fs_free_blocks_count(rd->fs->super))
{
printf("Requested number of inodes is too big, it requires at least %llu free blocks, "
"and there are only %llu free blocks available\n",
required_blocks, ext2fs_free_blocks_count(rd->fs->super));
retval = ENOSPC;
goto out;
}
}
else if (rd->ibg_new == rd->ibg_old)
{
printf("The requested number of inodes is equal to current\n");
goto out;
}
printf("Phase %d: Moving data blocks out of the way\n", phase++);
retval = extend_move_blocks(rd);
if (retval)
{
goto out;
}
printf("Phase %d: Changing all inode numbers\n", phase++);
retval = change_inode_numbers(rd);
if (retval)
{
goto out;
}
printf("Phase %d: Adjusting superblock and block group descriptors\n", phase++);
retval = change_super_and_bgd(rd);
if (retval)
{
goto out;
}
/* printf("Phase %d: Fixing all directory checksums\n", phase++);
retval = fix_dirent_csums(rd);
if (retval)
{
goto out;
}*/
out:
if (rd->new_itable_loc)
{
ext2fs_free_mem(&rd->new_itable_loc);
}
if (rd->inode_map)
{
free(rd->inode_map);
rd->inode_map = NULL;
}
return retval;
}
__u32 atou(char *s)
{
__u32 x = 0;
if (s[0] == '0')
{
if (s[1] == 'x' || s[1] == 'X')
{
sscanf(s+2, "%x", &x);
}
else
{
sscanf(s+1, "%o", &x);
}
}
else
{
sscanf(s, "%u", &x);
}
return x;
}
const char *program_name = "realloc-inodes";
static int setup_patch_io(char *name, char *patch_file, io_manager *io_ptr)
{
set_patch_io_backing_manager(*io_ptr);
set_patch_io_patch_file(patch_file);
*io_ptr = patch_io_manager;
printf(
"To make backup before applying changes run:\n"
" e2patch backup %s %s %s.backup\n"
"Then, to apply the inode change operation to the real filesystem run:\n"
" e2patch apply %s %s\n"
, name, patch_file, patch_file, name, patch_file);
return 0;
}
int main(int narg, char **args)
{
realloc_data rd = { 0 };
int optind, retval, io_flags = 0, force = 0;
io_manager io_ptr = unix_io_manager;
struct stat64 st_buf;
for (optind = 1; optind < narg; optind++)
{
if (!strcmp(args[optind], "--patch"))
rd.patch_file = args[++optind];
else if (!strcmp(args[optind], "--force"))
force = 1;
else if (args[optind][0] == '-' && args[optind][1] == '-')
{
if (strcmp(args[optind], "--help") != 0)
printf("Unknown option: %s\n", args[optind]);
break;
}
else if (!rd.device_name)
rd.device_name = args[optind];
else
rd.new_inode_count = atou(args[optind++]);
}
if (!rd.device_name || !rd.new_inode_count)
{
printf(
"Change inode count of an ext2/ext3/ext4 filesystem\n"
"License: GNU GPLv2 or later\nCopyright (c) Vitaliy Filippov, 2013+\n\n"
"USAGE: ./realloc-inodes [--patch <patch_file>] <device> <new_inode_count>\n\n"
"If <patch_file> is specified, all modifications are written to it\n"
"instead of directly modifying the filesystem. These modifications\n"
"can then be applied and unapplied to the real filesystem in a safe way.\n"
"<patch_file> should be on a filesystem supporting sparse files.\n"
);
return 0;
}
add_error_table(&et_ext2_error_table);
// Open FS
rd.fs_fd = ext2fs_open_file(rd.device_name, O_RDWR, 0);
if (rd.fs_fd < 0)
{
com_err(program_name, errno, _("while opening %s"), rd.device_name);
exit(1);
}
// FIXME Don't know why, but it segfaults if I use ext2fs_fstat here! (of course with ext2fs_struct_stat)
retval = fstat64(rd.fs_fd, &st_buf);
if (retval < 0)
{
com_err(program_name, errno, _("while getting stat information for %s"), rd.device_name);
exit(1);
}
if (!S_ISREG(st_buf.st_mode))
{
close(rd.fs_fd);
rd.fs_fd = -1;
}
rd.io_options = strchr(rd.device_name, '?');
if (rd.io_options)
{
*rd.io_options++ = 0;
}
if (rd.patch_file)
{
setup_patch_io(rd.device_name, rd.patch_file, &io_ptr);
}
io_flags = EXT2_FLAG_64BITS | EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
retval = ext2fs_open2(rd.device_name, rd.io_options, io_flags, 0, 0, io_ptr, &rd.fs);
if (retval)
{
com_err(program_name, retval, _("while trying to open %s"), rd.device_name);
printf(_("Couldn't find valid filesystem superblock.\n"));
goto close_fd;
}
if (!force)
{
if ((rd.fs->super->s_state & EXT2_ERROR_FS) ||
!(rd.fs->super->s_state & EXT2_VALID_FS) ||
(rd.fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER))
{
fprintf(stderr, _("Please run 'e2fsck -f %s' first.\n\n"), rd.device_name);
goto close_fs;
}
if (rd.fs->super->s_feature_incompat & ~REALLOC_FEATURE_INCOMPAT_SUPP ||
rd.fs->super->s_feature_compat & ~REALLOC_FEATURE_COMPAT_SUPP ||
rd.fs->super->s_feature_ro_compat & ~REALLOC_FEATURE_RO_COMPAT_SUPP)
{
retval = EXT2_ET_UNSUPP_FEATURE;
com_err(program_name, retval, _("while trying to open %s"), rd.device_name);
goto close_fs;
}
}
// Call main realloc function
retval = do_realloc(&rd);
if (retval)
{
com_err(program_name, retval, _("while resizing inode count"));
goto close_fs;
}
close_fs:
ext2fs_close(rd.fs);
close_fd:
if (rd.fs_fd > 0)
{
close(rd.fs_fd);
}
return retval;
}
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