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e2fsprogs/resize/resize2fs.c

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/*
* resize2fs.c --- ext2 main routine
*
* Copyright (C) 1997, 1998 by Theodore Ts'o and
* PowerQuest, Inc.
*
* Copyright (C) 1999, 2000 by Theodore Ts'o
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
/*
* Resizing a filesystem consists of the following phases:
*
* 1. Adjust superblock and write out new parts of the inode
* table
* 2. Determine blocks which need to be relocated, and copy the
* contents of blocks from their old locations to the new ones.
* 3. Scan the inode table, doing the following:
* a. If blocks have been moved, update the block
* pointers in the inodes and indirect blocks to
* point at the new block locations.
* b. If parts of the inode table need to be evacuated,
* copy inodes from their old locations to their
* new ones.
* c. If (b) needs to be done, note which blocks contain
* directory information, since we will need to
* update the directory information.
* 4. Update the directory blocks with the new inode locations.
* 5. Move the inode tables, if necessary.
*/
#include "config.h"
#include "resize2fs.h"
#include <time.h>
#ifdef __linux__ /* Kludge for debugging */
#define RESIZE2FS_DEBUG
#endif
static void fix_uninit_block_bitmaps(ext2_filsys fs);
static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size);
static errcode_t blocks_to_move(ext2_resize_t rfs);
static errcode_t block_mover(ext2_resize_t rfs);
static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
static errcode_t inode_ref_fix(ext2_resize_t rfs);
static errcode_t move_itables(ext2_resize_t rfs);
static errcode_t fix_resize_inode(ext2_filsys fs);
static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
static errcode_t fix_sb_journal_backup(ext2_filsys fs);
static errcode_t mark_table_blocks(ext2_filsys fs,
ext2fs_block_bitmap bmap);
static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs);
static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
ext2fs_block_bitmap meta_bmap);
static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size);
static errcode_t move_bg_metadata(ext2_resize_t rfs);
static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs);
/*
* Some helper functions to check if a block is in a metadata area
*/
static inline int is_block_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
{
return blk == ext2fs_block_bitmap_loc(fs, grp);
}
static inline int is_inode_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
{
return blk == ext2fs_inode_bitmap_loc(fs, grp);
}
static int is_inode_tb(ext2_filsys fs, unsigned int grp, blk64_t blk)
{
return blk >= ext2fs_inode_table_loc(fs, grp) &&
blk < (ext2fs_inode_table_loc(fs, grp) +
fs->inode_blocks_per_group);
}
/* Some bigalloc helper macros which are more succinct... */
#define B2C(x) EXT2FS_B2C(fs, (x))
#define C2B(x) EXT2FS_C2B(fs, (x))
#define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
#define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
#define LT_CLSTR(x, y) (B2C(x) < B2C(y))
#define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
#define GT_CLSTR(x, y) (B2C(x) > B2C(y))
static int lazy_itable_init;
/*
* This is the top-level routine which does the dirty deed....
*/
errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
errcode_t (*progress)(ext2_resize_t rfs, int pass,
unsigned long cur,
unsigned long max_val))
{
ext2_resize_t rfs;
errcode_t retval;
struct resource_track rtrack, overall_track;
/*
* Create the data structure
*/
retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
if (retval)
return retval;
memset(rfs, 0, sizeof(struct ext2_resize_struct));
fs->priv_data = rfs;
rfs->old_fs = fs;
rfs->flags = flags;
rfs->itable_buf = 0;
rfs->progress = progress;
init_resource_track(&overall_track, "overall resize2fs", fs->io);
init_resource_track(&rtrack, "read_bitmaps", fs->io);
retval = ext2fs_read_bitmaps(fs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
fs->super->s_state |= EXT2_ERROR_FS;
ext2fs_mark_super_dirty(fs);
ext2fs_flush(fs);
init_resource_track(&rtrack, "fix_uninit_block_bitmaps 1", fs->io);
fix_uninit_block_bitmaps(fs);
print_resource_track(rfs, &rtrack, fs->io);
retval = ext2fs_dup_handle(fs, &rfs->new_fs);
if (retval)
goto errout;
init_resource_track(&rtrack, "resize_group_descriptors", fs->io);
retval = resize_group_descriptors(rfs, *new_size);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "move_bg_metadata", fs->io);
retval = move_bg_metadata(rfs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "zero_high_bits_in_metadata", fs->io);
retval = zero_high_bits_in_inodes(rfs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "adjust_superblock", fs->io);
retval = adjust_superblock(rfs, *new_size);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
fix_uninit_block_bitmaps(rfs->new_fs);
print_resource_track(rfs, &rtrack, fs->io);
/* Clear the block bitmap uninit flag for the last block group */
ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
EXT2_BG_BLOCK_UNINIT);
*new_size = ext2fs_blocks_count(rfs->new_fs->super);
init_resource_track(&rtrack, "blocks_to_move", fs->io);
retval = blocks_to_move(rfs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_BMOVE)
printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
ext2fs_free_blocks_count(rfs->old_fs->super),
ext2fs_free_blocks_count(rfs->new_fs->super),
rfs->needed_blocks);
#endif
init_resource_track(&rtrack, "block_mover", fs->io);
retval = block_mover(rfs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
retval = inode_scan_and_fix(rfs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "inode_ref_fix", fs->io);
retval = inode_ref_fix(rfs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "move_itables", fs->io);
retval = move_itables(rfs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
retval = clear_sparse_super2_last_group(rfs);
if (retval)
goto errout;
init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
retval = ext2fs_calculate_summary_stats(rfs->new_fs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "fix_resize_inode", fs->io);
retval = fix_resize_inode(rfs->new_fs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
retval = fix_sb_journal_backup(rfs->new_fs);
if (retval)
goto errout;
print_resource_track(rfs, &rtrack, fs->io);
retval = ext2fs_set_gdt_csum(rfs->new_fs);
if (retval)
goto errout;
rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
print_resource_track(rfs, &overall_track, fs->io);
retval = ext2fs_close_free(&rfs->new_fs);
if (retval)
goto errout;
rfs->flags = flags;
ext2fs_free(rfs->old_fs);
rfs->old_fs = NULL;
if (rfs->itable_buf)
ext2fs_free_mem(&rfs->itable_buf);
if (rfs->reserve_blocks)
ext2fs_free_block_bitmap(rfs->reserve_blocks);
if (rfs->move_blocks)
ext2fs_free_block_bitmap(rfs->move_blocks);
ext2fs_free_mem(&rfs);
return 0;
errout:
if (rfs->new_fs) {
ext2fs_free(rfs->new_fs);
rfs->new_fs = NULL;
}
if (rfs->itable_buf)
ext2fs_free_mem(&rfs->itable_buf);
ext2fs_free_mem(&rfs);
return retval;
}
/* Keep the size of the group descriptor region constant */
static void adjust_reserved_gdt_blocks(ext2_filsys old_fs, ext2_filsys fs)
{
if (ext2fs_has_feature_resize_inode(fs->super) &&
(old_fs->desc_blocks != fs->desc_blocks)) {
int new;
new = ((int) fs->super->s_reserved_gdt_blocks) +
(old_fs->desc_blocks - fs->desc_blocks);
if (new < 0)
new = 0;
if (new > (int) fs->blocksize/4)
new = fs->blocksize/4;
fs->super->s_reserved_gdt_blocks = new;
}
}
/* Toggle 64bit mode */
static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size)
{
void *o, *n, *new_group_desc;
dgrp_t i;
int copy_size;
errcode_t retval;
if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
return 0;
if (new_size != ext2fs_blocks_count(rfs->new_fs->super) ||
ext2fs_blocks_count(rfs->new_fs->super) >= (1ULL << 32) ||
(rfs->flags & RESIZE_DISABLE_64BIT &&
rfs->flags & RESIZE_ENABLE_64BIT))
return EXT2_ET_INVALID_ARGUMENT;
if (rfs->flags & RESIZE_DISABLE_64BIT) {
ext2fs_clear_feature_64bit(rfs->new_fs->super);
rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE;
} else if (rfs->flags & RESIZE_ENABLE_64BIT) {
ext2fs_set_feature_64bit(rfs->new_fs->super);
rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
}
if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
EXT2_DESC_SIZE(rfs->new_fs->super))
return 0;
o = rfs->new_fs->group_desc;
rfs->new_fs->desc_blocks = ext2fs_div_ceil(
rfs->old_fs->group_desc_count,
EXT2_DESC_PER_BLOCK(rfs->new_fs->super));
retval = ext2fs_get_arrayzero(rfs->new_fs->desc_blocks,
rfs->old_fs->blocksize, &new_group_desc);
if (retval)
return retval;
n = new_group_desc;
if (EXT2_DESC_SIZE(rfs->old_fs->super) <=
EXT2_DESC_SIZE(rfs->new_fs->super))
copy_size = EXT2_DESC_SIZE(rfs->old_fs->super);
else
copy_size = EXT2_DESC_SIZE(rfs->new_fs->super);
for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
memcpy(n, o, copy_size);
n = (char *)n + EXT2_DESC_SIZE(rfs->new_fs->super);
o = (char *)o + EXT2_DESC_SIZE(rfs->old_fs->super);
}
ext2fs_free_mem(&rfs->new_fs->group_desc);
rfs->new_fs->group_desc = new_group_desc;
for (i = 0; i < rfs->old_fs->group_desc_count; i++)
ext2fs_group_desc_csum_set(rfs->new_fs, i);
adjust_reserved_gdt_blocks(rfs->old_fs, rfs->new_fs);
return 0;
}
/* Move bitmaps/inode tables out of the way. */
static errcode_t move_bg_metadata(ext2_resize_t rfs)
{
dgrp_t i;
blk64_t b, c, d, old_desc_blocks, new_desc_blocks, j;
ext2fs_block_bitmap old_map, new_map;
int old, new;
errcode_t retval;
int cluster_ratio;
if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
return 0;
retval = ext2fs_allocate_block_bitmap(rfs->old_fs, "oldfs", &old_map);
if (retval)
return retval;
retval = ext2fs_allocate_block_bitmap(rfs->new_fs, "newfs", &new_map);
if (retval)
goto out;
if (ext2fs_has_feature_meta_bg(rfs->old_fs->super)) {
old_desc_blocks = rfs->old_fs->super->s_first_meta_bg;
new_desc_blocks = rfs->new_fs->super->s_first_meta_bg;
} else {
old_desc_blocks = rfs->old_fs->desc_blocks +
rfs->old_fs->super->s_reserved_gdt_blocks;
new_desc_blocks = rfs->new_fs->desc_blocks +
rfs->new_fs->super->s_reserved_gdt_blocks;
}
/* Construct bitmaps of super/descriptor blocks in old and new fs */
for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, i, &b, &c, &d,
NULL);
if (retval)
goto out;
if (b)
ext2fs_mark_block_bitmap2(old_map, b);
for (j = 0; c != 0 && j < old_desc_blocks; j++)
ext2fs_mark_block_bitmap2(old_map, c + j);
if (d)
ext2fs_mark_block_bitmap2(old_map, d);
retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, i, &b, &c, &d,
NULL);
if (retval)
goto out;
if (b)
ext2fs_mark_block_bitmap2(new_map, b);
for (j = 0; c != 0 && j < new_desc_blocks; j++)
ext2fs_mark_block_bitmap2(new_map, c + j);
if (d)
ext2fs_mark_block_bitmap2(new_map, d);
}
cluster_ratio = EXT2FS_CLUSTER_RATIO(rfs->new_fs);
/* Find changes in block allocations for bg metadata */
for (b = EXT2FS_B2C(rfs->old_fs,
rfs->old_fs->super->s_first_data_block);
b < ext2fs_blocks_count(rfs->new_fs->super);
b += cluster_ratio) {
old = ext2fs_test_block_bitmap2(old_map, b);
new = ext2fs_test_block_bitmap2(new_map, b);
if (old && !new) {
/* mark old_map, unmark new_map */
if (cluster_ratio == 1)
ext2fs_unmark_block_bitmap2(
rfs->new_fs->block_map, b);
} else if (!old && new)
; /* unmark old_map, mark new_map */
else {
ext2fs_unmark_block_bitmap2(old_map, b);
ext2fs_unmark_block_bitmap2(new_map, b);
}
}
/*
* new_map now shows blocks that have been newly allocated.
* old_map now shows blocks that have been newly freed.
*/
/*
* Move any conflicting bitmaps and inode tables. Ensure that we
* don't try to free clusters associated with bitmaps or tables.
*/
for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
b = ext2fs_block_bitmap_loc(rfs->new_fs, i);
if (ext2fs_test_block_bitmap2(new_map, b))
ext2fs_block_bitmap_loc_set(rfs->new_fs, i, 0);
else if (ext2fs_test_block_bitmap2(old_map, b))
ext2fs_unmark_block_bitmap2(old_map, b);
b = ext2fs_inode_bitmap_loc(rfs->new_fs, i);
if (ext2fs_test_block_bitmap2(new_map, b))
ext2fs_inode_bitmap_loc_set(rfs->new_fs, i, 0);
else if (ext2fs_test_block_bitmap2(old_map, b))
ext2fs_unmark_block_bitmap2(old_map, b);
c = ext2fs_inode_table_loc(rfs->new_fs, i);
for (b = 0;
b < rfs->new_fs->inode_blocks_per_group;
b++) {
if (ext2fs_test_block_bitmap2(new_map, b + c))
ext2fs_inode_table_loc_set(rfs->new_fs, i, 0);
else if (ext2fs_test_block_bitmap2(old_map, b + c))
ext2fs_unmark_block_bitmap2(old_map, b + c);
}
}
/* Free unused clusters */
for (b = 0;
cluster_ratio > 1 && b < ext2fs_blocks_count(rfs->new_fs->super);
b += cluster_ratio)
if (ext2fs_test_block_bitmap2(old_map, b))
ext2fs_unmark_block_bitmap2(rfs->new_fs->block_map, b);
out:
if (old_map)
ext2fs_free_block_bitmap(old_map);
if (new_map)
ext2fs_free_block_bitmap(new_map);
return retval;
}
/* Zero out the high bits of extent fields */
static errcode_t zero_high_bits_in_extents(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode *inode)
{
ext2_extent_handle_t handle;
struct ext2fs_extent extent;
int op = EXT2_EXTENT_ROOT;
errcode_t errcode;
if (!(inode->i_flags & EXT4_EXTENTS_FL))
return 0;
errcode = ext2fs_extent_open(fs, ino, &handle);
if (errcode)
return errcode;
while (1) {
errcode = ext2fs_extent_get(handle, op, &extent);
if (errcode)
break;
op = EXT2_EXTENT_NEXT_SIB;
if (extent.e_pblk > (1ULL << 32)) {
extent.e_pblk &= (1ULL << 32) - 1;
errcode = ext2fs_extent_replace(handle, 0, &extent);
if (errcode)
break;
}
}
/* Ok if we run off the end */
if (errcode == EXT2_ET_EXTENT_NO_NEXT)
errcode = 0;
ext2fs_extent_free(handle);
return errcode;
}
/* Zero out the high bits of inodes. */
static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs)
{
ext2_filsys fs = rfs->old_fs;
int length = EXT2_INODE_SIZE(fs->super);
struct ext2_inode *inode = NULL;
ext2_inode_scan scan = NULL;
errcode_t retval;
ext2_ino_t ino;
if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
return 0;
if (fs->super->s_creator_os == EXT2_OS_HURD)
return 0;
retval = ext2fs_open_inode_scan(fs, 0, &scan);
if (retval)
return retval;
retval = ext2fs_get_mem(length, &inode);
if (retval)
goto out;
do {
retval = ext2fs_get_next_inode_full(scan, &ino, inode, length);
if (retval)
goto out;
if (!ino)
break;
if (!ext2fs_test_inode_bitmap2(fs->inode_map, ino))
continue;
/*
* Here's how we deal with high block number fields:
*
* - i_size_high has been been written out with i_size_lo
* since the ext2 days, so no conversion is needed.
*
* - i_blocks_hi is guarded by both the huge_file feature and
* inode flags and has always been written out with
* i_blocks_lo if the feature is set. The field is only
* ever read if both feature and inode flag are set, so
* we don't need to zero it now.
*
* - i_file_acl_high can be uninitialized, so zero it if
* it isn't already.
*/
if (inode->osd2.linux2.l_i_file_acl_high) {
inode->osd2.linux2.l_i_file_acl_high = 0;
retval = ext2fs_write_inode_full(fs, ino, inode,
length);
if (retval)
goto out;
}
retval = zero_high_bits_in_extents(fs, ino, inode);
if (retval)
goto out;
} while (ino);
out:
if (inode)
ext2fs_free_mem(&inode);
if (scan)
ext2fs_close_inode_scan(scan);
return retval;
}
/*
* Clean up the bitmaps for uninitialized bitmaps
*/
static void fix_uninit_block_bitmaps(ext2_filsys fs)
{
blk64_t blk, lblk;
dgrp_t g;
unsigned int i;
if (!ext2fs_has_group_desc_csum(fs))
return;
for (g=0; g < fs->group_desc_count; g++) {
if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
continue;
blk = ext2fs_group_first_block2(fs, g);
lblk = ext2fs_group_last_block2(fs, g);
ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
lblk - blk + 1);
ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
ext2fs_mark_block_bitmap2(fs->block_map,
ext2fs_block_bitmap_loc(fs, g));
ext2fs_mark_block_bitmap2(fs->block_map,
ext2fs_inode_bitmap_loc(fs, g));
for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
i < fs->inode_blocks_per_group;
i++, blk++)
ext2fs_mark_block_bitmap2(fs->block_map, blk);
}
}
/* --------------------------------------------------------------------
*
* Resize processing, phase 1.
*
* In this phase we adjust the in-memory superblock information, and
* initialize any new parts of the inode table. The new parts of the
* inode table are created in virgin disk space, so we can abort here
* without any side effects.
* --------------------------------------------------------------------
*/
/*
* If the group descriptor's bitmap and inode table blocks are valid,
* release them in the new filesystem data structure, and mark them as
* reserved so the old inode table blocks don't get overwritten.
*/
static errcode_t free_gdp_blocks(ext2_filsys fs,
ext2fs_block_bitmap reserve_blocks,
ext2_filsys old_fs,
dgrp_t group)
{
blk64_t blk;
unsigned int j;
dgrp_t i;
ext2fs_block_bitmap bg_map = NULL;
errcode_t retval = 0;
dgrp_t count = old_fs->group_desc_count - fs->group_desc_count;
/* If bigalloc, don't free metadata living in the same cluster */
if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
retval = ext2fs_allocate_block_bitmap(fs, "bgdata", &bg_map);
if (retval)
goto out;
retval = mark_table_blocks(fs, bg_map);
if (retval)
goto out;
}
for (i = group; i < group + count; i++) {
blk = ext2fs_block_bitmap_loc(old_fs, i);
if (blk &&
(blk < ext2fs_blocks_count(fs->super)) &&
!(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
ext2fs_block_alloc_stats2(fs, blk, -1);
ext2fs_mark_block_bitmap2(reserve_blocks, blk);
}
blk = ext2fs_inode_bitmap_loc(old_fs, i);
if (blk &&
(blk < ext2fs_blocks_count(fs->super)) &&
!(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
ext2fs_block_alloc_stats2(fs, blk, -1);
ext2fs_mark_block_bitmap2(reserve_blocks, blk);
}
blk = ext2fs_inode_table_loc(old_fs, i);
for (j = 0;
j < fs->inode_blocks_per_group; j++, blk++) {
if (blk >= ext2fs_blocks_count(fs->super) ||
(bg_map && ext2fs_test_block_bitmap2(bg_map, blk)))
continue;
ext2fs_block_alloc_stats2(fs, blk, -1);
ext2fs_mark_block_bitmap2(reserve_blocks, blk);
}
}
out:
if (bg_map)
ext2fs_free_block_bitmap(bg_map);
return retval;
}
/*
* This routine is shared by the online and offline resize routines.
* All of the information which is adjusted in memory is done here.
*/
errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
{
errcode_t retval;
blk64_t overhead = 0;
blk64_t rem;
blk64_t blk, group_block;
blk64_t real_end;
blk64_t old_numblocks, numblocks, adjblocks;
unsigned long i, j, old_desc_blocks;
unsigned int meta_bg, meta_bg_size;
int has_super, csum_flag, has_bg;
unsigned long long new_inodes; /* u64 to check for overflow */
double percent;
ext2fs_blocks_count_set(fs->super, new_size);
retry:
fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
fs->super->s_first_data_block,
EXT2_BLOCKS_PER_GROUP(fs->super));
if (fs->group_desc_count == 0)
return EXT2_ET_TOOSMALL;
fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
EXT2_DESC_PER_BLOCK(fs->super));
/*
* Overhead is the number of bookkeeping blocks per group. It
* includes the superblock backup, the group descriptor
* backups, the inode bitmap, the block bitmap, and the inode
* table.
*/
overhead = (int) (2 + fs->inode_blocks_per_group);
has_bg = 0;
if (ext2fs_has_feature_sparse_super2(fs->super)) {
/*
* We have to do this manually since
* super->s_backup_bgs hasn't been set up yet.
*/
if (fs->group_desc_count == 2)
has_bg = fs->super->s_backup_bgs[0] != 0;
else
has_bg = fs->super->s_backup_bgs[1] != 0;
} else
has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
if (has_bg)
overhead += 1 + fs->desc_blocks +
fs->super->s_reserved_gdt_blocks;
/*
* See if the last group is big enough to support the
* necessary data structures. If not, we need to get rid of
* it.
*/
rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
fs->super->s_blocks_per_group;
if ((fs->group_desc_count == 1) && rem && (rem < overhead))
return EXT2_ET_TOOSMALL;
if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
ext2fs_blocks_count_set(fs->super,
ext2fs_blocks_count(fs->super) - rem);
goto retry;
}
/*
* Adjust the number of inodes
*/
new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
if (new_inodes > ~0U) {
fprintf(stderr, _("inodes (%llu) must be less than %u\n"),
new_inodes, ~0U);
return EXT2_ET_TOO_MANY_INODES;
}
fs->super->s_inodes_count = fs->super->s_inodes_per_group *
fs->group_desc_count;
/*
* Adjust the number of free blocks
*/
blk = ext2fs_blocks_count(old_fs->super);
if (blk > ext2fs_blocks_count(fs->super))
ext2fs_free_blocks_count_set(fs->super,
ext2fs_free_blocks_count(fs->super) -
(blk - ext2fs_blocks_count(fs->super)));
else
ext2fs_free_blocks_count_set(fs->super,
ext2fs_free_blocks_count(fs->super) +
(ext2fs_blocks_count(fs->super) - blk));
/*
* Adjust the number of reserved blocks
*/
percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
ext2fs_blocks_count(old_fs->super);
ext2fs_r_blocks_count_set(fs->super,
(percent * ext2fs_blocks_count(fs->super) /
100.0));
/*
* Adjust the bitmaps for size
*/
retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
fs->super->s_inodes_count,
fs->inode_map);
if (retval) goto errout;
real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
fs->super->s_first_data_block;
retval = ext2fs_resize_block_bitmap2(new_size - 1,
real_end, fs->block_map);
if (retval) goto errout;
/*
* If we are growing the file system, also grow the size of
* the reserve_blocks bitmap
*/
if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
retval = ext2fs_resize_block_bitmap2(new_size - 1,
real_end, reserve_blocks);
if (retval) goto errout;
}
/*
* Reallocate the group descriptors as necessary.
*/
if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
old_fs->desc_blocks != fs->desc_blocks) {
retval = ext2fs_resize_mem(old_fs->desc_blocks *
fs->blocksize,
fs->desc_blocks * fs->blocksize,
&fs->group_desc);
if (retval)
goto errout;
if (fs->desc_blocks > old_fs->desc_blocks)
memset((char *) fs->group_desc +
(old_fs->desc_blocks * fs->blocksize), 0,
(fs->desc_blocks - old_fs->desc_blocks) *
fs->blocksize);
}
/*
* If the resize_inode feature is set, and we are changing the
* number of descriptor blocks, then adjust
* s_reserved_gdt_blocks if possible to avoid needing to move
* the inode table either now or in the future.
*
* Note: If we're converting to 64bit mode, we did this earlier.
*/
if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
adjust_reserved_gdt_blocks(old_fs, fs);
if (ext2fs_has_feature_meta_bg(fs->super) &&
(fs->super->s_first_meta_bg > fs->desc_blocks)) {
ext2fs_clear_feature_meta_bg(fs->super);
fs->super->s_first_meta_bg = 0;
}
/*
* Update the location of the backup superblocks if the
* sparse_super2 feature is enabled.
*/
if (ext2fs_has_feature_sparse_super2(fs->super)) {
dgrp_t last_bg = fs->group_desc_count - 1;
dgrp_t old_last_bg = old_fs->group_desc_count - 1;
if (last_bg > old_last_bg) {
if (old_fs->group_desc_count == 1)
fs->super->s_backup_bgs[0] = 1;
if ((old_fs->group_desc_count < 3 &&
fs->group_desc_count > 2) ||
fs->super->s_backup_bgs[1])
fs->super->s_backup_bgs[1] = last_bg;
} else if (last_bg < old_last_bg) {
if (fs->super->s_backup_bgs[0] > last_bg)
fs->super->s_backup_bgs[0] = 0;
if (fs->super->s_backup_bgs[1] > last_bg)
fs->super->s_backup_bgs[1] = 0;
if (last_bg > 1 &&
old_fs->super->s_backup_bgs[1] == old_last_bg)
fs->super->s_backup_bgs[1] = last_bg;
}
}
/*
* If we are shrinking the number of block groups, we're done
* and can exit now.
*/
if (old_fs->group_desc_count > fs->group_desc_count) {
/*
* Check the block groups that we are chopping off
* and free any blocks associated with their metadata
*/
retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
fs->group_desc_count);
goto errout;
}
/*
* Fix the count of the last (old) block group
*/
old_numblocks = (ext2fs_blocks_count(old_fs->super) -
old_fs->super->s_first_data_block) %
old_fs->super->s_blocks_per_group;
if (!old_numblocks)
old_numblocks = old_fs->super->s_blocks_per_group;
if (old_fs->group_desc_count == fs->group_desc_count) {
numblocks = (ext2fs_blocks_count(fs->super) -
fs->super->s_first_data_block) %
fs->super->s_blocks_per_group;
if (!numblocks)
numblocks = fs->super->s_blocks_per_group;
} else
numblocks = fs->super->s_blocks_per_group;
i = old_fs->group_desc_count - 1;
ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
ext2fs_group_desc_csum_set(fs, i);
/*
* If the number of block groups is staying the same, we're
* done and can exit now. (If the number block groups is
* shrinking, we had exited earlier.)
*/
if (old_fs->group_desc_count >= fs->group_desc_count) {
retval = 0;
goto errout;
}
/*
* Initialize the new block group descriptors
*/
group_block = ext2fs_group_first_block2(fs,
old_fs->group_desc_count);
csum_flag = ext2fs_has_group_desc_csum(fs);
if (getenv("RESIZE2FS_FORCE_LAZY_ITABLE_INIT") ||
(!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0))
lazy_itable_init = 1;
if (ext2fs_has_feature_meta_bg(fs->super))
old_desc_blocks = fs->super->s_first_meta_bg;
else
old_desc_blocks = fs->desc_blocks +
fs->super->s_reserved_gdt_blocks;
/*
* If we changed the number of block_group descriptor blocks,
* we need to make sure they are all marked as reserved in the
* filesystem's block allocation map.
*/
for (i = 0; i < old_fs->group_desc_count; i++)
ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
for (i = old_fs->group_desc_count;
i < fs->group_desc_count; i++) {
memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
sizeof(struct ext2_group_desc));
adjblocks = 0;
ext2fs_bg_flags_zap(fs, i);
if (csum_flag) {
ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
if (!lazy_itable_init)
ext2fs_bg_flags_set(fs, i,
EXT2_BG_INODE_ZEROED);
ext2fs_bg_itable_unused_set(fs, i,
fs->super->s_inodes_per_group);
}
numblocks = ext2fs_group_blocks_count(fs, i);
if ((i < fs->group_desc_count - 1) && csum_flag)
ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
has_super = ext2fs_bg_has_super(fs, i);
if (has_super) {
ext2fs_block_alloc_stats2(fs, group_block, +1);
adjblocks++;
}
meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
meta_bg = i / meta_bg_size;
if (!ext2fs_has_feature_meta_bg(fs->super) ||
(meta_bg < fs->super->s_first_meta_bg)) {
if (has_super) {
for (j=0; j < old_desc_blocks; j++)
ext2fs_block_alloc_stats2(fs,
group_block + 1 + j, +1);
adjblocks += old_desc_blocks;
}
} else {
if (has_super)
has_super = 1;
if (((i % meta_bg_size) == 0) ||
((i % meta_bg_size) == 1) ||
((i % meta_bg_size) == (meta_bg_size-1)))
ext2fs_block_alloc_stats2(fs,
group_block + has_super, +1);
}
adjblocks += 2 + fs->inode_blocks_per_group;
numblocks -= adjblocks;
ext2fs_free_blocks_count_set(fs->super,
ext2fs_free_blocks_count(fs->super) - adjblocks);
fs->super->s_free_inodes_count +=
fs->super->s_inodes_per_group;
ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
ext2fs_bg_free_inodes_count_set(fs, i,
fs->super->s_inodes_per_group);
ext2fs_bg_used_dirs_count_set(fs, i, 0);
ext2fs_group_desc_csum_set(fs, i);
retval = ext2fs_allocate_group_table(fs, i, 0);
if (retval) goto errout;
group_block += fs->super->s_blocks_per_group;
}
retval = 0;
/*
* Mark all of the metadata blocks as reserved so they won't
* get allocated by the call to ext2fs_allocate_group_table()
* in blocks_to_move(), where we allocate new blocks to
* replace those allocation bitmap and inode table blocks
* which have to get relocated to make space for an increased
* number of the block group descriptors.
*/
if (reserve_blocks)
mark_table_blocks(fs, reserve_blocks);
errout:
return (retval);
}
/*
* This routine adjusts the superblock and other data structures, both
* in disk as well as in memory...
*/
static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
{
ext2_filsys fs = rfs->new_fs;
int adj = 0;
errcode_t retval;
blk64_t group_block;
unsigned long i;
unsigned long max_group;
ext2fs_mark_super_dirty(fs);
ext2fs_mark_bb_dirty(fs);
ext2fs_mark_ib_dirty(fs);
retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
&rfs->reserve_blocks);
if (retval)
return retval;
retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
if (retval)
goto errout;
/*
* Check to make sure there are enough inodes
*/
if ((rfs->old_fs->super->s_inodes_count -
rfs->old_fs->super->s_free_inodes_count) >
rfs->new_fs->super->s_inodes_count) {
retval = ENOSPC;
goto errout;
}
/*
* If we are shrinking the number block groups, we're done and
* can exit now.
*/
if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
retval = 0;
goto errout;
}
/*
* If the number of block groups is staying the same, we're
* done and can exit now. (If the number block groups is
* shrinking, we had exited earlier.)
*/
if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
retval = 0;
goto errout;
}
/*
* If we are using uninit_bg (aka GDT_CSUM) and the kernel
* supports lazy inode initialization, we can skip
* initializing the inode table.
*/
if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
retval = 0;
goto errout;
}
/*
* Initialize the inode table
*/
retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
&rfs->itable_buf);
if (retval)
goto errout;
memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
group_block = ext2fs_group_first_block2(fs,
rfs->old_fs->group_desc_count);
adj = rfs->old_fs->group_desc_count;
max_group = fs->group_desc_count - adj;
if (rfs->progress) {
retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
0, max_group);
if (retval)
goto errout;
}
for (i = rfs->old_fs->group_desc_count;
i < fs->group_desc_count; i++) {
/*
* Write out the new inode table
*/
retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
fs->inode_blocks_per_group, NULL,
NULL);
if (retval)
goto errout;
io_channel_flush(fs->io);
if (rfs->progress) {
retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
i - adj + 1, max_group);
if (retval)
goto errout;
}
group_block += fs->super->s_blocks_per_group;
}
io_channel_flush(fs->io);
retval = 0;
errout:
return retval;
}
/* --------------------------------------------------------------------
*
* Resize processing, phase 2.
*
* In this phase we adjust determine which blocks need to be moved, in
* blocks_to_move(). We then copy the blocks to their ultimate new
* destinations using block_mover(). Since we are copying blocks to
* their new locations, again during this pass we can abort without
* any problems.
* --------------------------------------------------------------------
*/
/*
* This helper function creates a block bitmap with all of the
* filesystem meta-data blocks.
*/
static errcode_t mark_table_blocks(ext2_filsys fs,
ext2fs_block_bitmap bmap)
{
dgrp_t i;
blk64_t blk;
for (i = 0; i < fs->group_desc_count; i++) {
ext2fs_reserve_super_and_bgd(fs, i, bmap);
/*
* Mark the blocks used for the inode table
*/
blk = ext2fs_inode_table_loc(fs, i);
if (blk)
ext2fs_mark_block_bitmap_range2(bmap, blk,
fs->inode_blocks_per_group);
/*
* Mark block used for the block bitmap
*/
blk = ext2fs_block_bitmap_loc(fs, i);
if (blk)
ext2fs_mark_block_bitmap2(bmap, blk);
/*
* Mark block used for the inode bitmap
*/
blk = ext2fs_inode_bitmap_loc(fs, i);
if (blk)
ext2fs_mark_block_bitmap2(bmap, blk);
}
return 0;
}
/*
* This function checks to see if a particular block (either a
* superblock or a block group descriptor) overlaps with an inode or
* block bitmap block, or with the inode table.
*/
static void mark_fs_metablock(ext2_resize_t rfs,
ext2fs_block_bitmap meta_bmap,
int group, blk64_t blk)
{
ext2_filsys fs = rfs->new_fs;
ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
ext2fs_block_alloc_stats2(fs, blk, +1);
/*
* Check to see if we overlap with the inode or block bitmap,
* or the inode tables. If not, and the block is in use, then
* mark it as a block to be moved.
*/
if (is_block_bm(fs, group, blk)) {
ext2fs_block_bitmap_loc_set(fs, group, 0);
rfs->needed_blocks++;
return;
}
if (is_inode_bm(fs, group, blk)) {
ext2fs_inode_bitmap_loc_set(fs, group, 0);
rfs->needed_blocks++;
return;
}
if (is_inode_tb(fs, group, blk)) {
ext2fs_inode_table_loc_set(fs, group, 0);
rfs->needed_blocks++;
return;
}
if (ext2fs_has_feature_flex_bg(fs->super)) {
dgrp_t i;
for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
if (is_block_bm(fs, i, blk)) {
ext2fs_block_bitmap_loc_set(fs, i, 0);
rfs->needed_blocks++;
return;
}
if (is_inode_bm(fs, i, blk)) {
ext2fs_inode_bitmap_loc_set(fs, i, 0);
rfs->needed_blocks++;
return;
}
if (is_inode_tb(fs, i, blk)) {
ext2fs_inode_table_loc_set(fs, i, 0);
rfs->needed_blocks++;
return;
}
}
}
if (ext2fs_has_group_desc_csum(fs) &&
(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
/*
* If the block bitmap is uninitialized, which means
* nothing other than standard metadata in use.
*/
return;
} else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
!ext2fs_test_block_bitmap2(meta_bmap, blk)) {
ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
rfs->needed_blocks++;
}
}
/*
* This routine marks and unmarks reserved blocks in the new block
* bitmap. It also determines which blocks need to be moved and
* places this information into the move_blocks bitmap.
*/
static errcode_t blocks_to_move(ext2_resize_t rfs)
{
unsigned int j;
int has_super;
dgrp_t i, max_groups, g;
blk64_t blk, group_blk;
blk64_t old_blocks, new_blocks, group_end, cluster_freed;
blk64_t new_size;
unsigned int meta_bg, meta_bg_size;
errcode_t retval;
ext2_filsys fs, old_fs;
ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
int flex_bg;
fs = rfs->new_fs;
old_fs = rfs->old_fs;
if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
fs = rfs->old_fs;
retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
&rfs->move_blocks);
if (retval)
return retval;
retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
&meta_bmap);
if (retval)
return retval;
retval = mark_table_blocks(old_fs, meta_bmap);
if (retval)
return retval;
fs = rfs->new_fs;
/*
* If we're shrinking the filesystem, we need to move any
* group's metadata blocks (either allocation bitmaps or the
* inode table) which are beyond the end of the new
* filesystem.
*/
new_size = ext2fs_blocks_count(fs->super);
if (new_size < ext2fs_blocks_count(old_fs->super)) {
for (g = 0; g < fs->group_desc_count; g++) {
int realloc = 0;
/*
* ext2fs_allocate_group_table will re-allocate any
* metadata blocks whose location is set to zero.
*/
if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
ext2fs_block_bitmap_loc_set(fs, g, 0);
realloc = 1;
}
if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
ext2fs_inode_bitmap_loc_set(fs, g, 0);
realloc = 1;
}
if ((ext2fs_inode_table_loc(fs, g) +
fs->inode_blocks_per_group) > new_size) {
ext2fs_inode_table_loc_set(fs, g, 0);
realloc = 1;
}
if (realloc) {
retval = ext2fs_allocate_group_table(fs, g, 0);
if (retval)
return retval;
}
}
}
/*
* If we're shrinking the filesystem, we need to move all of
* the blocks that don't fit any more
*/
for (blk = ext2fs_blocks_count(fs->super);
blk < ext2fs_blocks_count(old_fs->super); blk++) {
g = ext2fs_group_of_blk2(fs, blk);
if (ext2fs_has_group_desc_csum(fs) &&
ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
/*
* The block bitmap is uninitialized, so skip
* to the next block group.
*/
blk = ext2fs_group_first_block2(fs, g+1) - 1;
continue;
}
if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
!ext2fs_test_block_bitmap2(meta_bmap, blk)) {
ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
rfs->needed_blocks++;
}
ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
}
if (ext2fs_has_feature_meta_bg(old_fs->super))
old_blocks = old_fs->super->s_first_meta_bg;
else
old_blocks = old_fs->desc_blocks +
old_fs->super->s_reserved_gdt_blocks;
if (ext2fs_has_feature_meta_bg(fs->super))
new_blocks = fs->super->s_first_meta_bg;
else
new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
if (retval)
goto errout;
if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
EXT2_DESC_SIZE(rfs->new_fs->super) &&
old_blocks == new_blocks) {
retval = 0;
goto errout;
}
max_groups = fs->group_desc_count;
if (max_groups > old_fs->group_desc_count)
max_groups = old_fs->group_desc_count;
group_blk = old_fs->super->s_first_data_block;
/*
* If we're reducing the number of descriptor blocks, this
* makes life easy. :-) We just have to mark some extra
* blocks as free.
*/
if (old_blocks > new_blocks) {
if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
retval = ext2fs_allocate_block_bitmap(fs,
_("new meta blocks"),
&new_meta_bmap);
if (retval)
goto errout;
retval = mark_table_blocks(fs, new_meta_bmap);
if (retval)
goto errout;
}
for (i = 0; i < max_groups; i++) {
if (!ext2fs_bg_has_super(old_fs, i)) {
group_blk += fs->super->s_blocks_per_group;
continue;
}
group_end = group_blk + 1 + old_blocks;
for (blk = group_blk + 1 + new_blocks;
blk < group_end;) {
if (new_meta_bmap == NULL ||
!ext2fs_test_block_bitmap2(new_meta_bmap,
blk)) {
cluster_freed =
EXT2FS_CLUSTER_RATIO(fs) -
(blk &
EXT2FS_CLUSTER_MASK(fs));
if (cluster_freed > group_end - blk)
cluster_freed = group_end - blk;
ext2fs_block_alloc_stats2(fs, blk, -1);
blk += EXT2FS_CLUSTER_RATIO(fs);
rfs->needed_blocks -= cluster_freed;
continue;
}
rfs->needed_blocks--;
blk++;
}
group_blk += fs->super->s_blocks_per_group;
}
retval = 0;
goto errout;
}
/*
* If we're increasing the number of descriptor blocks, life
* gets interesting....
*/
meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
flex_bg = ext2fs_has_feature_flex_bg(fs->super);
/* first reserve all of the existing fs meta blocks */
for (i = 0; i < max_groups; i++) {
has_super = ext2fs_bg_has_super(fs, i);
if (has_super)
mark_fs_metablock(rfs, meta_bmap, i, group_blk);
meta_bg = i / meta_bg_size;
if (!ext2fs_has_feature_meta_bg(fs->super) ||
(meta_bg < fs->super->s_first_meta_bg)) {
if (has_super) {
for (blk = group_blk+1;
blk < group_blk + 1 + new_blocks; blk++)
mark_fs_metablock(rfs, meta_bmap,
i, blk);
}
} else {
if (has_super)
has_super = 1;
if (((i % meta_bg_size) == 0) ||
((i % meta_bg_size) == 1) ||
((i % meta_bg_size) == (meta_bg_size-1)))
mark_fs_metablock(rfs, meta_bmap, i,
group_blk + has_super);
}
/*
* Reserve the existing meta blocks that we know
* aren't to be moved.
*
* For flex_bg file systems, in order to avoid
* overwriting fs metadata (especially inode table
* blocks) belonging to a different block group when
* we are relocating the inode tables, we need to
* reserve all existing fs metadata blocks.
*/
if (ext2fs_block_bitmap_loc(fs, i))
ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
ext2fs_block_bitmap_loc(fs, i));
else if (flex_bg && i < old_fs->group_desc_count)
ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
ext2fs_block_bitmap_loc(old_fs, i));
if (ext2fs_inode_bitmap_loc(fs, i))
ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
ext2fs_inode_bitmap_loc(fs, i));
else if (flex_bg && i < old_fs->group_desc_count)
ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
ext2fs_inode_bitmap_loc(old_fs, i));
if (ext2fs_inode_table_loc(fs, i))
ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
ext2fs_inode_table_loc(fs, i),
fs->inode_blocks_per_group);
else if (flex_bg && i < old_fs->group_desc_count)
ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
ext2fs_inode_table_loc(old_fs, i),
old_fs->inode_blocks_per_group);
group_blk += rfs->new_fs->super->s_blocks_per_group;
}
/* Allocate the missing data structures */
for (i = 0; i < max_groups; i++) {
if (ext2fs_inode_table_loc(fs, i) &&
ext2fs_inode_bitmap_loc(fs, i) &&
ext2fs_block_bitmap_loc(fs, i))
continue;
retval = ext2fs_allocate_group_table(fs, i,
rfs->reserve_blocks);
if (retval)
goto errout;
/*
* For those structures that have changed, we need to
* do bookkeeping.
*/
if (ext2fs_block_bitmap_loc(old_fs, i) !=
(blk = ext2fs_block_bitmap_loc(fs, i))) {
ext2fs_block_alloc_stats2(fs, blk, +1);
if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
!ext2fs_test_block_bitmap2(meta_bmap, blk))
ext2fs_mark_block_bitmap2(rfs->move_blocks,
blk);
}
if (ext2fs_inode_bitmap_loc(old_fs, i) !=
(blk = ext2fs_inode_bitmap_loc(fs, i))) {
ext2fs_block_alloc_stats2(fs, blk, +1);
if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
!ext2fs_test_block_bitmap2(meta_bmap, blk))
ext2fs_mark_block_bitmap2(rfs->move_blocks,
blk);
}
/*
* The inode table, if we need to relocate it, is
* handled specially. We have to reserve the blocks
* for both the old and the new inode table, since we
* can't have the inode table be destroyed during the
* block relocation phase.
*/
if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
continue; /* inode table not moved */
rfs->needed_blocks += fs->inode_blocks_per_group;
/*
* Mark the new inode table as in use in the new block
* allocation bitmap, and move any blocks that might
* be necessary.
*/
for (blk = ext2fs_inode_table_loc(fs, i), j=0;
j < fs->inode_blocks_per_group ; j++, blk++) {
ext2fs_block_alloc_stats2(fs, blk, +1);
if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
!ext2fs_test_block_bitmap2(meta_bmap, blk))
ext2fs_mark_block_bitmap2(rfs->move_blocks,
blk);
}
/*
* Make sure the old inode table is reserved in the
* block reservation bitmap.
*/
for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
j < fs->inode_blocks_per_group ; j++, blk++)
ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
}
retval = 0;
errout:
if (new_meta_bmap)
ext2fs_free_block_bitmap(new_meta_bmap);
if (meta_bmap)
ext2fs_free_block_bitmap(meta_bmap);
return retval;
}
/*
* This helper function tries to allocate a new block. We try to
* avoid hitting the original group descriptor blocks at least at
* first, since we want to make it possible to recover from a badly
* aborted resize operation as much as possible.
*
* In the future, I may further modify this routine to balance out
* where we get the new blocks across the various block groups.
* Ideally we would allocate blocks that corresponded with the block
* group of the containing inode, and keep contiguous blocks
* together. However, this very difficult to do efficiently, since we
* don't have the necessary information up front.
*/
#define AVOID_OLD 1
#define DESPERATION 2
static void init_block_alloc(ext2_resize_t rfs)
{
rfs->alloc_state = AVOID_OLD;
rfs->new_blk = rfs->new_fs->super->s_first_data_block;
#if 0
/* HACK for testing */
if (ext2fs_blocks_count(rfs->new_fs->super) >
ext2fs_blocks_count(rfs->old_fs->super))
rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
#endif
}
static blk64_t get_new_block(ext2_resize_t rfs)
{
ext2_filsys fs = rfs->new_fs;
while (1) {
if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
if (rfs->alloc_state == DESPERATION)
return 0;
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_BMOVE)
printf("Going into desperation mode "
"for block allocations\n");
#endif
rfs->alloc_state = DESPERATION;
rfs->new_blk = fs->super->s_first_data_block;
continue;
}
if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
ext2fs_test_block_bitmap2(rfs->reserve_blocks,
rfs->new_blk) ||
((rfs->alloc_state == AVOID_OLD) &&
(rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
rfs->new_blk))) {
rfs->new_blk++;
continue;
}
return rfs->new_blk;
}
}
static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
blk64_t goal EXT2FS_ATTR((unused)),
blk64_t *ret)
{
ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
blk64_t blk;
int group;
blk = get_new_block(rfs);
if (!blk)
return ENOSPC;
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & 0xF)
printf("get_alloc_block allocating %llu\n", blk);
#endif
ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
group = ext2fs_group_of_blk2(rfs->old_fs, blk);
ext2fs_clear_block_uninit(rfs->old_fs, group);
group = ext2fs_group_of_blk2(rfs->new_fs, blk);
ext2fs_clear_block_uninit(rfs->new_fs, group);
*ret = (blk64_t) blk;
return 0;
}
static errcode_t block_mover(ext2_resize_t rfs)
{
blk64_t blk, old_blk, new_blk;
ext2_filsys fs = rfs->new_fs;
ext2_filsys old_fs = rfs->old_fs;
errcode_t retval;
__u64 c, size;
int to_move, moved;
ext2_badblocks_list badblock_list = 0;
int bb_modified = 0;
fs->get_alloc_block = resize2fs_get_alloc_block;
old_fs->get_alloc_block = resize2fs_get_alloc_block;
retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
if (retval)
return retval;
new_blk = fs->super->s_first_data_block;
if (!rfs->itable_buf) {
retval = ext2fs_get_array(fs->blocksize,
fs->inode_blocks_per_group,
&rfs->itable_buf);
if (retval)
return retval;
}
retval = ext2fs_create_extent_table(&rfs->bmap, 0);
if (retval)
return retval;
/*
* The first step is to figure out where all of the blocks
* will go.
*/
to_move = moved = 0;
init_block_alloc(rfs);
for (blk = B2C(old_fs->super->s_first_data_block);
blk < ext2fs_blocks_count(old_fs->super);
blk += EXT2FS_CLUSTER_RATIO(fs)) {
if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
continue;
if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
continue;
if (ext2fs_badblocks_list_test(badblock_list, blk)) {
ext2fs_badblocks_list_del(badblock_list, blk);
bb_modified++;
continue;
}
new_blk = get_new_block(rfs);
if (!new_blk) {
retval = ENOSPC;
goto errout;
}
ext2fs_block_alloc_stats2(fs, new_blk, +1);
ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
to_move++;
}
if (to_move == 0) {
if (rfs->bmap) {
ext2fs_free_extent_table(rfs->bmap);
rfs->bmap = 0;
}
retval = 0;
goto errout;
}
/*
* Step two is to actually move the blocks
*/
retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
if (retval) goto errout;
if (rfs->progress) {
retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
0, to_move);
if (retval)
goto errout;
}
while (1) {
retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
if (retval) goto errout;
if (!size)
break;
old_blk = C2B(old_blk);
new_blk = C2B(new_blk);
size = C2B(size);
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_BMOVE)
printf("Moving %llu blocks %llu->%llu\n",
size, old_blk, new_blk);
#endif
do {
c = size;
if (c > fs->inode_blocks_per_group)
c = fs->inode_blocks_per_group;
retval = io_channel_read_blk64(fs->io, old_blk, c,
rfs->itable_buf);
if (retval) goto errout;
retval = io_channel_write_blk64(fs->io, new_blk, c,
rfs->itable_buf);
if (retval) goto errout;
size -= c;
new_blk += c;
old_blk += c;
moved += c;
if (rfs->progress) {
io_channel_flush(fs->io);
retval = (rfs->progress)(rfs,
E2_RSZ_BLOCK_RELOC_PASS,
moved, to_move);
if (retval)
goto errout;
}
} while (size > 0);
io_channel_flush(fs->io);
}
errout:
if (badblock_list) {
if (!retval && bb_modified)
retval = ext2fs_update_bb_inode(old_fs,
badblock_list);
ext2fs_badblocks_list_free(badblock_list);
}
return retval;
}
/* --------------------------------------------------------------------
*
* Resize processing, phase 3
*
* --------------------------------------------------------------------
*/
/*
* The extent translation table is stored in clusters so we need to
* take special care when mapping a source block number to its
* destination block number.
*/
static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
{
__u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
if (new_block != 0)
new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
return new_block;
}
struct process_block_struct {
ext2_resize_t rfs;
ext2_ino_t ino;
ext2_ino_t old_ino;
struct ext2_inode * inode;
errcode_t error;
int is_dir;
int changed;
int has_extents;
};
static int process_block(ext2_filsys fs, blk64_t *block_nr,
e2_blkcnt_t blockcnt,
blk64_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
{
struct process_block_struct *pb;
errcode_t retval;
blk64_t block, new_block;
int ret = 0;
pb = (struct process_block_struct *) priv_data;
block = *block_nr;
if (pb->rfs->bmap) {
new_block = extent_translate(fs, pb->rfs->bmap, block);
if (new_block) {
*block_nr = new_block;
ret |= BLOCK_CHANGED;
pb->changed = 1;
#ifdef RESIZE2FS_DEBUG
if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
pb->old_ino, blockcnt, block,
new_block);
#endif
block = new_block;
}
}
if (pb->is_dir) {
retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
block, (int) blockcnt);
if (retval) {
pb->error = retval;
ret |= BLOCK_ABORT;
}
}
return ret;
}
/*
* Progress callback
*/
static errcode_t progress_callback(ext2_filsys fs,
ext2_inode_scan scan EXT2FS_ATTR((unused)),
dgrp_t group, void * priv_data)
{
ext2_resize_t rfs = (ext2_resize_t) priv_data;
errcode_t retval;
/*
* This check is to protect against old ext2 libraries. It
* shouldn't be needed against new libraries.
*/
if ((group+1) == 0)
return 0;
if (rfs->progress) {
io_channel_flush(fs->io);
retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
group+1, fs->group_desc_count);
if (retval)
return retval;
}
return 0;
}
static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
struct ext2_inode *inode, int *changed)
{
char *buf = NULL;
blk64_t new_block;
errcode_t err = 0;
/* No EA block or no remapping? Quit early. */
if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 || !rfs->bmap)
return 0;
new_block = extent_translate(rfs->old_fs, rfs->bmap,
ext2fs_file_acl_block(rfs->old_fs, inode));
if (new_block == 0)
return 0;
/* Set the new ACL block */
ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
/* Update checksum */
if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
if (err)
return err;
rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
if (err)
goto out;
err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
if (err)
goto out;
}
*changed = 1;
out:
ext2fs_free_mem(&buf);
return err;
}
static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
errcode_t code EXT2FS_ATTR((unused)),
const char *fmt EXT2FS_ATTR((unused)),
va_list args EXT2FS_ATTR((unused)))
{
}
static int fix_ea_entries(ext2_extent imap, struct ext2_ext_attr_entry *entry,
struct ext2_ext_attr_entry *end, ext2_ino_t last_ino)
{
int modified = 0;
ext2_ino_t new_ino;
while (entry < end && !EXT2_EXT_IS_LAST_ENTRY(entry)) {
if (entry->e_value_inum > last_ino) {
new_ino = ext2fs_extent_translate(imap,
entry->e_value_inum);
entry->e_value_inum = new_ino;
modified = 1;
}
entry = EXT2_EXT_ATTR_NEXT(entry);
}
return modified;
}
static int fix_ea_ibody_entries(ext2_extent imap,
struct ext2_inode_large *inode, int inode_size,
ext2_ino_t last_ino)
{
struct ext2_ext_attr_entry *start, *end;
__u32 *ea_magic;
if (inode->i_extra_isize == 0)
return 0;
ea_magic = (__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
inode->i_extra_isize);
if (*ea_magic != EXT2_EXT_ATTR_MAGIC)
return 0;
start = (struct ext2_ext_attr_entry *)(ea_magic + 1);
end = (struct ext2_ext_attr_entry *)((char *)inode + inode_size);
return fix_ea_entries(imap, start, end, last_ino);
}
static int fix_ea_block_entries(ext2_extent imap, char *block_buf,
unsigned int blocksize, ext2_ino_t last_ino)
{
struct ext2_ext_attr_header *header;
struct ext2_ext_attr_entry *start, *end;
header = (struct ext2_ext_attr_header *)block_buf;
start = (struct ext2_ext_attr_entry *)(header+1);
end = (struct ext2_ext_attr_entry *)(block_buf + blocksize);
return fix_ea_entries(imap, start, end, last_ino);
}
/* A simple LRU cache to check recently processed blocks. */
struct blk_cache {
int cursor;
blk64_t blks[4];
};
#define BLK_IN_CACHE(b,c) ((b) == (c).blks[0] || (b) == (c).blks[1] || \
(b) == (c).blks[2] || (b) == (c).blks[3])
#define BLK_ADD_CACHE(b,c) { \
(c).blks[(c).cursor] = (b); \
(c).cursor = ((c).cursor + 1) % 4; \
}
static errcode_t fix_ea_inode_refs(ext2_resize_t rfs, struct ext2_inode *inode,
char *block_buf, ext2_ino_t last_ino)
{
ext2_filsys fs = rfs->new_fs;
ext2_inode_scan scan = NULL;
ext2_ino_t ino;
int inode_size = EXT2_INODE_SIZE(fs->super);
blk64_t blk;
int modified;
struct blk_cache blk_cache;
struct ext2_ext_attr_header *header;
errcode_t retval;
memset(&blk_cache, 0, sizeof(blk_cache));
header = (struct ext2_ext_attr_header *)block_buf;
retval = ext2fs_open_inode_scan(fs, 0, &scan);
if (retval)
goto out;
while (1) {
retval = ext2fs_get_next_inode_full(scan, &ino, inode,
inode_size);
if (retval)
goto out;
if (!ino)
break;
if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
continue; /* inode not in use */
if (inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
modified = fix_ea_ibody_entries(rfs->imap,
(struct ext2_inode_large *)inode,
inode_size, last_ino);
if (modified) {
retval = ext2fs_write_inode_full(fs, ino, inode,
inode_size);
if (retval)
goto out;
}
}
blk = ext2fs_file_acl_block(fs, inode);
if (blk && !BLK_IN_CACHE(blk, blk_cache)) {
retval = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
if (retval)
goto out;
modified = fix_ea_block_entries(rfs->imap, block_buf,
fs->blocksize,
last_ino);
if (modified) {
retval = ext2fs_write_ext_attr3(fs, blk,
block_buf, ino);
if (retval)
goto out;
/*
* If refcount is greater than 1, we might see
* the same block referenced by other inodes
* later.
*/
if (header->h_refcount > 1)
BLK_ADD_CACHE(blk, blk_cache);
}
}
}
retval = 0;
out:
if (scan)
ext2fs_close_inode_scan(scan);
return retval;
}
static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
{
struct process_block_struct pb;
ext2_ino_t ino, new_inode;
struct ext2_inode *inode = NULL;
ext2_inode_scan scan = NULL;
errcode_t retval;
char *block_buf = 0;
ext2_ino_t start_to_move;
int inode_size;
int update_ea_inode_refs = 0;
if ((rfs->old_fs->group_desc_count <=
rfs->new_fs->group_desc_count) &&
!rfs->bmap)
return 0;
set_com_err_hook(quiet_com_err_proc);
retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
if (retval) goto errout;
retval = ext2fs_init_dblist(rfs->old_fs, 0);
if (retval) goto errout;
retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
if (retval) goto errout;
start_to_move = (rfs->new_fs->group_desc_count *
rfs->new_fs->super->s_inodes_per_group);
if (rfs->progress) {
retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
0, rfs->old_fs->group_desc_count);
if (retval)
goto errout;
}
ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
pb.rfs = rfs;
pb.inode = inode;
pb.error = 0;
new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
inode = malloc(inode_size);
if (!inode) {
retval = ENOMEM;
goto errout;
}
/*
* First, copy all of the inodes that need to be moved
* elsewhere in the inode table
*/
while (1) {
retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
if (retval) goto errout;
if (!ino)
break;
if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
continue; /* inode not in use */
pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
pb.changed = 0;
/* Remap EA block */
retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
if (retval)
goto errout;
new_inode = ino;
if (ino <= start_to_move)
goto remap_blocks; /* Don't need to move inode. */
/*
* Find a new inode. Now that extents and directory blocks
* are tied to the inode number through the checksum, we must
* set up the new inode before we start rewriting blocks.
*/
retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
if (retval)
goto errout;
ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
pb.is_dir);
/*
* i_ctime field in xattr inodes contain a portion of the ref
* count, do not overwrite.
*/
if (inode->i_flags & EXT4_EA_INODE_FL)
update_ea_inode_refs = 1;
else
inode->i_ctime = time(0);
retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
inode, inode_size);
if (retval)
goto errout;
pb.changed = 0;
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_INODEMAP)
printf("Inode moved %u->%u\n", ino, new_inode);
#endif
if (!rfs->imap) {
retval = ext2fs_create_extent_table(&rfs->imap, 0);
if (retval)
goto errout;
}
ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
remap_blocks:
if (pb.changed)
retval = ext2fs_write_inode_full(rfs->old_fs,
new_inode,
inode, inode_size);
if (retval)
goto errout;
/*
* Update inodes to point to new blocks; schedule directory
* blocks for inode remapping. Need to write out dir blocks
* with new inode numbers if we have metadata_csum enabled.
*/
rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
(rfs->bmap || pb.is_dir)) {
pb.ino = new_inode;
pb.old_ino = ino;
pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
retval = ext2fs_block_iterate3(rfs->old_fs,
new_inode, 0, block_buf,
process_block, &pb);
if (retval)
goto errout;
if (pb.error) {
retval = pb.error;
goto errout;
}
} else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
(rfs->bmap || pb.is_dir)) {
/* inline data dir; update it too */
retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
new_inode, 0, 0);
if (retval)
goto errout;
}
/* Fix up extent block checksums with the new inode number */
if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
(inode->i_flags & EXT4_EXTENTS_FL)) {
retval = ext2fs_fix_extents_checksums(rfs->old_fs,
new_inode, NULL);
if (retval)
goto errout;
}
}
if (update_ea_inode_refs &&
ext2fs_has_feature_ea_inode(rfs->new_fs->super)) {
retval = fix_ea_inode_refs(rfs, inode, block_buf,
start_to_move);
if (retval)
goto errout;
}
io_channel_flush(rfs->old_fs->io);
errout:
reset_com_err_hook();
rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
if (rfs->bmap) {
ext2fs_free_extent_table(rfs->bmap);
rfs->bmap = 0;
}
if (scan)
ext2fs_close_inode_scan(scan);
if (block_buf)
ext2fs_free_mem(&block_buf);
free(inode);
return retval;
}
/* --------------------------------------------------------------------
*
* Resize processing, phase 4.
*
* --------------------------------------------------------------------
*/
struct istruct {
ext2_resize_t rfs;
errcode_t err;
unsigned int max_dirs;
unsigned int num;
};
static int check_and_change_inodes(ext2_ino_t dir,
int entry EXT2FS_ATTR((unused)),
struct ext2_dir_entry *dirent, int offset,
int blocksize EXT2FS_ATTR((unused)),
char *buf EXT2FS_ATTR((unused)),
void *priv_data)
{
struct istruct *is = (struct istruct *) priv_data;
struct ext2_inode inode;
ext2_ino_t new_inode;
errcode_t retval;
int ret = 0;
if (is->rfs->progress && offset == 0) {
io_channel_flush(is->rfs->old_fs->io);
is->err = (is->rfs->progress)(is->rfs,
E2_RSZ_INODE_REF_UPD_PASS,
++is->num, is->max_dirs);
if (is->err)
return DIRENT_ABORT;
}
/*
* If we have checksums enabled and the inode wasn't present in the
* old fs, then we must rewrite all dir blocks with new checksums.
*/
if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
!ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
ret |= DIRENT_CHANGED;
if (!dirent->inode)
return ret;
new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
if (!new_inode)
return ret;
#ifdef RESIZE2FS_DEBUG
if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
dir, ext2fs_dirent_name_len(dirent), dirent->name,
dirent->inode, new_inode);
#endif
dirent->inode = new_inode;
/* Update the directory mtime and ctime */
retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
if (retval == 0) {
inode.i_mtime = inode.i_ctime = time(0);
is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
if (is->err)
return ret | DIRENT_ABORT;
}
return ret | DIRENT_CHANGED;
}
static errcode_t inode_ref_fix(ext2_resize_t rfs)
{
errcode_t retval;
struct istruct is;
if (!rfs->imap)
return 0;
/*
* Now, we iterate over all of the directories to update the
* inode references
*/
is.num = 0;
is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
is.rfs = rfs;
is.err = 0;
if (rfs->progress) {
retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
0, is.max_dirs);
if (retval)
goto errout;
}
rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
DIRENT_FLAG_INCLUDE_EMPTY, 0,
check_and_change_inodes, &is);
rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
if (retval)
goto errout;
if (is.err) {
retval = is.err;
goto errout;
}
if (rfs->progress && (is.num < is.max_dirs))
(rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
is.max_dirs, is.max_dirs);
errout:
ext2fs_free_extent_table(rfs->imap);
rfs->imap = 0;
return retval;
}
/* --------------------------------------------------------------------
*
* Resize processing, phase 5.
*
* In this phase we actually move the inode table around, and then
* update the summary statistics. This is scary, since aborting here
* will potentially scramble the filesystem. (We are moving the
* inode tables around in place, and so the potential for lost data,
* or at the very least scrambling the mapping between filenames and
* inode numbers is very high in case of a power failure here.)
* --------------------------------------------------------------------
*/
/*
* A very scary routine --- this one moves the inode table around!!!
*
* After this you have to use the rfs->new_fs file handle to read and
* write inodes.
*/
static errcode_t move_itables(ext2_resize_t rfs)
{
int n, num, size;
long long diff;
dgrp_t i, max_groups;
ext2_filsys fs = rfs->new_fs;
char *cp;
blk64_t old_blk, new_blk, blk, cluster_freed;
errcode_t retval;
int to_move, moved;
unsigned int j;
ext2fs_block_bitmap new_bmap = NULL;
max_groups = fs->group_desc_count;
if (max_groups > rfs->old_fs->group_desc_count)
max_groups = rfs->old_fs->group_desc_count;
size = fs->blocksize * fs->inode_blocks_per_group;
if (!rfs->itable_buf) {
retval = ext2fs_get_mem(size, &rfs->itable_buf);
if (retval)
return retval;
}
if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
&new_bmap);
if (retval)
return retval;
retval = mark_table_blocks(fs, new_bmap);
if (retval)
goto errout;
}
/*
* Figure out how many inode tables we need to move
*/
to_move = moved = 0;
for (i=0; i < max_groups; i++)
if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
ext2fs_inode_table_loc(fs, i))
to_move++;
if (to_move == 0) {
retval = 0;
goto errout;
}
if (rfs->progress) {
retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
0, to_move);
if (retval)
goto errout;
}
rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
for (i=0; i < max_groups; i++) {
old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
new_blk = ext2fs_inode_table_loc(fs, i);
diff = new_blk - old_blk;
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
printf("Itable move group %d block %llu->%llu (diff %lld)\n",
i, old_blk, new_blk, diff);
#endif
if (!diff)
continue;
if (diff < 0)
diff = 0;
retval = io_channel_read_blk64(fs->io, old_blk,
fs->inode_blocks_per_group,
rfs->itable_buf);
if (retval)
goto errout;
/*
* The end of the inode table segment often contains
* all zeros, and we're often only moving the inode
* table down a block or two. If so, we can optimize
* things by not rewriting blocks that we know to be zero
* already.
*/
for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
if (*cp)
break;
n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
printf("%d blocks of zeros...\n", n);
#endif
num = fs->inode_blocks_per_group;
if (n > diff)
num -= n;
retval = io_channel_write_blk64(fs->io, new_blk,
num, rfs->itable_buf);
if (retval) {
io_channel_write_blk64(fs->io, old_blk,
num, rfs->itable_buf);
goto errout;
}
if (n > diff) {
retval = io_channel_write_blk64(fs->io,
old_blk + fs->inode_blocks_per_group,
diff, (rfs->itable_buf +
(fs->inode_blocks_per_group - diff) *
fs->blocksize));
if (retval)
goto errout;
}
for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
j < fs->inode_blocks_per_group;) {
if (new_bmap == NULL ||
!ext2fs_test_block_bitmap2(new_bmap, blk)) {
ext2fs_block_alloc_stats2(fs, blk, -1);
cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
(blk & EXT2FS_CLUSTER_MASK(fs));
blk += cluster_freed;
j += cluster_freed;
continue;
}
blk++;
j++;
}
ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
ext2fs_group_desc_csum_set(rfs->old_fs, i);
ext2fs_mark_super_dirty(rfs->old_fs);
ext2fs_flush(rfs->old_fs);
if (rfs->progress) {
retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
++moved, to_move);
if (retval)
goto errout;
}
}
mark_table_blocks(fs, fs->block_map);
ext2fs_flush(fs);
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
printf("Inode table move finished.\n");
#endif
retval = 0;
errout:
if (new_bmap)
ext2fs_free_block_bitmap(new_bmap);
return retval;
}
/*
* This function is used when expanding a file system. It frees the
* superblock and block group descriptor blocks from the block group
* which is no longer the last block group.
*/
static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
{
ext2_filsys fs = rfs->new_fs;
ext2_filsys old_fs = rfs->old_fs;
errcode_t retval;
dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
dgrp_t last_bg = fs->group_desc_count - 1;
blk64_t sb, old_desc;
blk_t num;
if (!ext2fs_has_feature_sparse_super2(fs->super))
return 0;
if (last_bg <= old_last_bg)
return 0;
if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
return 0;
if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
old_fs->super->s_backup_bgs[1] != old_last_bg)
return 0;
if (fs->super->s_backup_bgs[0] == old_last_bg ||
fs->super->s_backup_bgs[1] == old_last_bg)
return 0;
if (old_last_bg == 0)
return 0;
retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
&sb, &old_desc, NULL, &num);
if (retval)
return retval;
if (sb)
ext2fs_unmark_block_bitmap2(fs->block_map, sb);
if (old_desc)
ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
return 0;
}
/*
* This function is used when shrinking a file system. We need to
* utilize blocks from what will be the new last block group for the
* backup superblock and block group descriptor blocks.
* Unfortunately, those blocks may be used by other files or fs
* metadata blocks. We need to mark them as being in use.
*/
static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
ext2fs_block_bitmap meta_bmap)
{
ext2_filsys fs = rfs->new_fs;
ext2_filsys old_fs = rfs->old_fs;
errcode_t retval;
dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
dgrp_t last_bg = fs->group_desc_count - 1;
dgrp_t g;
blk64_t blk, sb, old_desc;
blk_t i, num;
int realloc = 0;
if (!ext2fs_has_feature_sparse_super2(fs->super))
return 0;
if (last_bg >= old_last_bg)
return 0;
if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
return 0;
if (fs->super->s_backup_bgs[0] != last_bg &&
fs->super->s_backup_bgs[1] != last_bg)
return 0;
if (old_fs->super->s_backup_bgs[0] == last_bg ||
old_fs->super->s_backup_bgs[1] == last_bg)
return 0;
retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
&sb, &old_desc, NULL, &num);
if (retval)
return retval;
if (last_bg && !sb) {
fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
stderr);
exit(1);
}
if (old_desc && old_desc != sb+1) {
fputs(_("Should never happen! Unexpected old_desc in "
"super_sparse bg?\n"),
stderr);
exit(1);
}
num = (old_desc) ? num : 1;
/* Reserve the backup blocks */
ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
for (g = 0; g < fs->group_desc_count; g++) {
blk64_t mb;
mb = ext2fs_block_bitmap_loc(fs, g);
if ((mb >= sb) && (mb < sb + num)) {
ext2fs_block_bitmap_loc_set(fs, g, 0);
realloc = 1;
}
mb = ext2fs_inode_bitmap_loc(fs, g);
if ((mb >= sb) && (mb < sb + num)) {
ext2fs_inode_bitmap_loc_set(fs, g, 0);
realloc = 1;
}
mb = ext2fs_inode_table_loc(fs, g);
if ((mb < sb + num) &&
(sb < mb + fs->inode_blocks_per_group)) {
ext2fs_inode_table_loc_set(fs, g, 0);
realloc = 1;
}
if (realloc) {
retval = ext2fs_allocate_group_table(fs, g, 0);
if (retval)
return retval;
}
}
for (blk = sb, i = 0; i < num; blk++, i++) {
if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
!ext2fs_test_block_bitmap2(meta_bmap, blk)) {
ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
rfs->needed_blocks++;
}
ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
}
return 0;
}
/*
* Fix the resize inode
*/
static errcode_t fix_resize_inode(ext2_filsys fs)
{
struct ext2_inode inode;
errcode_t retval;
if (!ext2fs_has_feature_resize_inode(fs->super))
return 0;
retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
if (retval) goto errout;
ext2fs_iblk_set(fs, &inode, 1);
retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
if (retval) goto errout;
if (!inode.i_block[EXT2_DIND_BLOCK]) {
/*
* Avoid zeroing out block #0; that's rude. This
* should never happen anyway since the filesystem
* should be fsck'ed and we assume it is consistent.
*/
fprintf(stderr, "%s",
_("Should never happen: resize inode corrupt!\n"));
exit(1);
}
retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
NULL, NULL);
if (retval)
goto errout;
retval = ext2fs_create_resize_inode(fs);
if (retval)
goto errout;
errout:
return retval;
}
/*
* Finally, recalculate the summary information
*/
static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
{
blk64_t blk;
ext2_ino_t ino;
unsigned int group = 0;
unsigned int count = 0;
blk64_t total_blocks_free = 0;
int total_inodes_free = 0;
int group_free = 0;
int uninit = 0;
blk64_t super_blk, old_desc_blk, new_desc_blk;
int old_desc_blocks;
/*
* First calculate the block statistics
*/
uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
&new_desc_blk, 0);
if (ext2fs_has_feature_meta_bg(fs->super))
old_desc_blocks = fs->super->s_first_meta_bg;
else
old_desc_blocks = fs->desc_blocks +
fs->super->s_reserved_gdt_blocks;
for (blk = B2C(fs->super->s_first_data_block);
blk < ext2fs_blocks_count(fs->super);
blk += EXT2FS_CLUSTER_RATIO(fs)) {
if ((uninit &&
!(EQ_CLSTR(blk, super_blk) ||
((old_desc_blk && old_desc_blocks &&
GE_CLSTR(blk, old_desc_blk) &&
LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
+ fs->inode_blocks_per_group))))) ||
(!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
group_free++;
total_blocks_free++;
}
count++;
if ((count == fs->super->s_clusters_per_group) ||
EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
ext2fs_bg_free_blocks_count_set(fs, group, group_free);
ext2fs_group_desc_csum_set(fs, group);
group++;
if (group >= fs->group_desc_count)
break;
count = 0;
group_free = 0;
uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
&old_desc_blk,
&new_desc_blk, 0);
if (ext2fs_has_feature_meta_bg(fs->super))
old_desc_blocks = fs->super->s_first_meta_bg;
else
old_desc_blocks = fs->desc_blocks +
fs->super->s_reserved_gdt_blocks;
}
}
total_blocks_free = C2B(total_blocks_free);
ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
/*
* Next, calculate the inode statistics
*/
group_free = 0;
count = 0;
group = 0;
/* Protect loop from wrap-around if s_inodes_count maxed */
uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
if (uninit ||
!ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
group_free++;
total_inodes_free++;
}
count++;
if ((count == fs->super->s_inodes_per_group) ||
(ino == fs->super->s_inodes_count)) {
ext2fs_bg_free_inodes_count_set(fs, group, group_free);
ext2fs_group_desc_csum_set(fs, group);
group++;
if (group >= fs->group_desc_count)
break;
count = 0;
group_free = 0;
uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
}
}
fs->super->s_free_inodes_count = total_inodes_free;
ext2fs_mark_super_dirty(fs);
return 0;
}
/*
* Journal may have been relocated; update the backup journal blocks
* in the superblock.
*/
static errcode_t fix_sb_journal_backup(ext2_filsys fs)
{
errcode_t retval;
struct ext2_inode inode;
if (!ext2fs_has_feature_journal(fs->super))
return 0;
/* External journal? Nothing to do. */
if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
return 0;
retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
if (retval)
return retval;
memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
fs->super->s_jnl_blocks[15] = inode.i_size_high;
fs->super->s_jnl_blocks[16] = inode.i_size;
fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
ext2fs_mark_super_dirty(fs);
return 0;
}
static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
int old_desc_blocks)
{
blk64_t super_blk, old_desc_blk, new_desc_blk;
int overhead;
/* inode table blocks plus allocation bitmaps */
overhead = fs->inode_blocks_per_group + 2;
ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
&old_desc_blk, &new_desc_blk, 0);
if ((grp == 0) || super_blk)
overhead++;
if (old_desc_blk)
overhead += old_desc_blocks;
else if (new_desc_blk)
overhead++;
return overhead;
}
/*
* calculate the minimum number of blocks the given fs can be resized to
*/
blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
{
ext2_ino_t inode_count;
dgrp_t groups, flex_groups;
blk64_t blks_needed, data_blocks;
blk64_t grp, data_needed, last_start;
blk64_t overhead = 0;
int old_desc_blocks;
int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
/*
* first figure out how many group descriptors we need to
* handle the number of inodes we have
*/
inode_count = fs->super->s_inodes_count -
fs->super->s_free_inodes_count;
blks_needed = ext2fs_div_ceil(inode_count,
fs->super->s_inodes_per_group) *
(blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
groups = ext2fs_div64_ceil(blks_needed,
EXT2_BLOCKS_PER_GROUP(fs->super));
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("fs has %d inodes, %d groups required.\n",
inode_count, groups);
#endif
/*
* number of old-style block group descriptor blocks
*/
if (ext2fs_has_feature_meta_bg(fs->super))
old_desc_blocks = fs->super->s_first_meta_bg;
else
old_desc_blocks = fs->desc_blocks +
fs->super->s_reserved_gdt_blocks;
/* calculate how many blocks are needed for data */
data_needed = ext2fs_blocks_count(fs->super);
for (grp = 0; grp < fs->group_desc_count; grp++) {
data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
data_needed -= ext2fs_bg_free_blocks_count(fs, grp);
}
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("fs requires %llu data blocks.\n", data_needed);
#endif
/*
* For ext4 we need to allow for up to a flex_bg worth of
* inode tables of slack space so the resize operation can be
* guaranteed to finish.
*/
flex_groups = groups;
if (ext2fs_has_feature_flex_bg(fs->super)) {
dgrp_t remainder = groups & (flexbg_size - 1);
flex_groups += flexbg_size - remainder;
if (flex_groups > fs->group_desc_count)
flex_groups = fs->group_desc_count;
}
/*
* figure out how many data blocks we have given the number of groups
* we need for our inodes
*/
data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
last_start = 0;
for (grp = 0; grp < flex_groups; grp++) {
overhead = calc_group_overhead(fs, grp, old_desc_blocks);
/*
* we want to keep track of how much data we can store in
* the groups leading up to the last group so we can determine
* how big the last group needs to be
*/
if (grp < (groups - 1))
last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
overhead;
if (data_blocks > overhead)
data_blocks -= overhead;
else
data_blocks = 0;
}
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("With %d group(s), we have %llu blocks available.\n",
groups, data_blocks);
#endif
/*
* if we need more group descriptors in order to accommodate our data
* then we need to add them here
*/
blks_needed = data_needed;
while (blks_needed > data_blocks) {
blk64_t remainder = blks_needed - data_blocks;
dgrp_t extra_grps;
/* figure out how many more groups we need for the data */
extra_grps = ext2fs_div64_ceil(remainder,
EXT2_BLOCKS_PER_GROUP(fs->super));
data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
/* ok we have to account for the last group */
overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
grp = flex_groups;
groups += extra_grps;
if (!ext2fs_has_feature_flex_bg(fs->super))
flex_groups = groups;
else if (groups > flex_groups) {
dgrp_t r = groups & (flexbg_size - 1);
flex_groups = groups + flexbg_size - r;
if (flex_groups > fs->group_desc_count)
flex_groups = fs->group_desc_count;
}
for (; grp < flex_groups; grp++) {
overhead = calc_group_overhead(fs, grp,
old_desc_blocks);
/*
* again, we need to see how much data we cram into
* all of the groups leading up to the last group
*/
if (grp < groups - 1)
last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
- overhead;
data_blocks -= overhead;
}
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("Added %d extra group(s), "
"blks_needed %llu, data_blocks %llu, "
"last_start %llu\n", extra_grps, blks_needed,
data_blocks, last_start);
#endif
}
/* now for the fun voodoo */
grp = groups - 1;
if (ext2fs_has_feature_flex_bg(fs->super) &&
(grp & ~(flexbg_size - 1)) == 0)
grp = grp & ~(flexbg_size - 1);
overhead = 0;
for (; grp < flex_groups; grp++)
overhead += calc_group_overhead(fs, grp, old_desc_blocks);
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("Last group's overhead is %llu\n", overhead);
#endif
/*
* if this is the case then the last group is going to have data in it
* so we need to adjust the size of the last group accordingly
*/
if (last_start < blks_needed) {
blk64_t remainder = blks_needed - last_start;
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("Need %llu data blocks in last group\n",
remainder);
#endif
/*
* 50 is a magic number that mkfs/resize uses to see if its
* even worth making/resizing the fs. basically you need to
* have at least 50 blocks in addition to the blocks needed
* for the metadata in the last group
*/
if (remainder > 50)
overhead += remainder;
else
overhead += 50;
} else
overhead += 50;
overhead += fs->super->s_first_data_block;
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("Final size of last group is %lld\n", overhead);
#endif
/* Add extra slack for bigalloc file systems */
if (EXT2FS_CLUSTER_RATIO(fs) > 1)
overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
/*
* since our last group doesn't have to be BLOCKS_PER_GROUP
* large, we only do groups-1, and then add the number of
* blocks needed to handle the group descriptor metadata+data
* that we need
*/
blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
blks_needed += overhead;
/*
* Make sure blks_needed covers the end of the inode table in
* the last block group.
*/
overhead = ext2fs_inode_table_loc(fs, groups-1) +
fs->inode_blocks_per_group;
if (blks_needed < overhead)
blks_needed = overhead;
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("Estimated blocks needed: %llu\n", blks_needed);
#endif
/*
* If at this point we've already added up more "needed" than
* the current size, just return current size as minimum.
*/
if (blks_needed >= ext2fs_blocks_count(fs->super))
return ext2fs_blocks_count(fs->super);
/*
* We need to reserve a few extra blocks if extents are
* enabled, in case we need to grow the extent tree. The more
* we shrink the file system, the more space we need.
*
* The absolute worst case is every single data block is in
* the part of the file system that needs to be evacuated,
* with each data block needs to be in its own extent, and
* with each inode needing at least one extent block.
*/
if (ext2fs_has_feature_extents(fs->super)) {
blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
blks_needed)/500;
unsigned int exts_per_blk = (fs->blocksize /
sizeof(struct ext3_extent)) - 1;
blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
exts_per_blk);
if (worst_case < inode_count)
worst_case = inode_count;
if (safe_margin > worst_case)
safe_margin = worst_case;
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("Extents safety margin: %llu\n", safe_margin);
#endif
blks_needed += safe_margin;
}
return blks_needed;
}
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