mirror of
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
synced 2025-01-19 23:13:43 +08:00
8728d50657
Signed-off-by: Valerie Aurora Henson <vaurora@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2082 lines
57 KiB
C
2082 lines
57 KiB
C
/*
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* resize2fs.c --- ext2 main routine
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*
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* Copyright (C) 1997, 1998 by Theodore Ts'o and
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* PowerQuest, Inc.
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*
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* Copyright (C) 1999, 2000 by Theosore Ts'o
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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/*
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* Resizing a filesystem consists of the following phases:
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*
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* 1. Adjust superblock and write out new parts of the inode
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* table
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* 2. Determine blocks which need to be relocated, and copy the
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* contents of blocks from their old locations to the new ones.
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* 3. Scan the inode table, doing the following:
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* a. If blocks have been moved, update the block
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* pointers in the inodes and indirect blocks to
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* point at the new block locations.
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* b. If parts of the inode table need to be evacuated,
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* copy inodes from their old locations to their
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* new ones.
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* c. If (b) needs to be done, note which blocks contain
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* directory information, since we will need to
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* update the directory information.
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* 4. Update the directory blocks with the new inode locations.
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* 5. Move the inode tables, if necessary.
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*/
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#include "resize2fs.h"
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#include <time.h>
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#ifdef __linux__ /* Kludge for debugging */
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#define RESIZE2FS_DEBUG
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#endif
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static void fix_uninit_block_bitmaps(ext2_filsys fs);
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static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size);
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static errcode_t blocks_to_move(ext2_resize_t rfs);
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static errcode_t block_mover(ext2_resize_t rfs);
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static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
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static errcode_t inode_ref_fix(ext2_resize_t rfs);
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static errcode_t move_itables(ext2_resize_t rfs);
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static errcode_t fix_resize_inode(ext2_filsys fs);
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static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
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static errcode_t fix_sb_journal_backup(ext2_filsys fs);
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/*
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* Some helper CPP macros
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*/
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#define IS_BLOCK_BM(fs, i, blk) ((blk) == ext2fs_block_bitmap_loc((fs),(i)))
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#define IS_INODE_BM(fs, i, blk) ((blk) == ext2fs_inode_bitmap_loc((fs),(i)))
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#define IS_INODE_TB(fs, i, blk) (((blk) >= ext2fs_inode_table_loc((fs), (i))) && \
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((blk) < (ext2fs_inode_table_loc((fs), (i)) + \
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(fs)->inode_blocks_per_group)))
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#define META_OVERHEAD(fs) (2 + (fs)->inode_blocks_per_group)
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#define SUPER_OVERHEAD(fs) (1 + (fs)->desc_blocks +\
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(fs)->super->s_reserved_gdt_blocks)
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/*
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* This is the top-level routine which does the dirty deed....
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*/
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errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
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errcode_t (*progress)(ext2_resize_t rfs, int pass,
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unsigned long cur,
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unsigned long max_val))
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{
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ext2_resize_t rfs;
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errcode_t retval;
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retval = ext2fs_read_bitmaps(fs);
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if (retval)
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return retval;
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fs->super->s_state |= EXT2_ERROR_FS;
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ext2fs_mark_super_dirty(fs);
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ext2fs_flush(fs);
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/*
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* Create the data structure
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*/
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retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
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if (retval)
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return retval;
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memset(rfs, 0, sizeof(struct ext2_resize_struct));
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fix_uninit_block_bitmaps(fs);
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fs->priv_data = rfs;
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rfs->old_fs = fs;
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rfs->flags = flags;
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rfs->itable_buf = 0;
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rfs->progress = progress;
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retval = ext2fs_dup_handle(fs, &rfs->new_fs);
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if (retval)
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goto errout;
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retval = adjust_superblock(rfs, *new_size);
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if (retval)
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goto errout;
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fix_uninit_block_bitmaps(rfs->new_fs);
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/* Clear the block bitmap uninit flag for the last block group */
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ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
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EXT2_BG_BLOCK_UNINIT);
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*new_size = ext2fs_blocks_count(rfs->new_fs->super);
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retval = blocks_to_move(rfs);
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if (retval)
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goto errout;
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#ifdef RESIZE2FS_DEBUG
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if (rfs->flags & RESIZE_DEBUG_BMOVE)
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printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
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ext2fs_free_blocks_count(rfs->old_fs->super),
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ext2fs_free_blocks_count(rfs->new_fs->super),
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rfs->needed_blocks);
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#endif
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retval = block_mover(rfs);
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if (retval)
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goto errout;
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retval = inode_scan_and_fix(rfs);
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if (retval)
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goto errout;
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retval = inode_ref_fix(rfs);
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if (retval)
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goto errout;
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retval = move_itables(rfs);
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if (retval)
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goto errout;
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retval = ext2fs_calculate_summary_stats(rfs->new_fs);
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if (retval)
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goto errout;
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retval = fix_resize_inode(rfs->new_fs);
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if (retval)
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goto errout;
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retval = fix_sb_journal_backup(rfs->new_fs);
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if (retval)
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goto errout;
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rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
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rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
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retval = ext2fs_close(rfs->new_fs);
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if (retval)
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goto errout;
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rfs->flags = flags;
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ext2fs_free(rfs->old_fs);
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if (rfs->itable_buf)
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ext2fs_free_mem(&rfs->itable_buf);
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if (rfs->reserve_blocks)
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ext2fs_free_block_bitmap(rfs->reserve_blocks);
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if (rfs->move_blocks)
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ext2fs_free_block_bitmap(rfs->move_blocks);
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ext2fs_free_mem(&rfs);
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return 0;
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errout:
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if (rfs->new_fs)
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ext2fs_free(rfs->new_fs);
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if (rfs->itable_buf)
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ext2fs_free_mem(&rfs->itable_buf);
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ext2fs_free_mem(&rfs);
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return retval;
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}
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/*
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* Clean up the bitmaps for unitialized bitmaps
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*/
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static void fix_uninit_block_bitmaps(ext2_filsys fs)
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{
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blk64_t i, blk, super_blk, old_desc_blk, new_desc_blk;
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int old_desc_blocks;
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dgrp_t g;
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if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
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EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
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return;
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for (g=0; g < fs->group_desc_count; g++) {
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if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
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continue;
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blk = (g * fs->super->s_blocks_per_group) +
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fs->super->s_first_data_block;
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ext2fs_super_and_bgd_loc2(fs, g, &super_blk,
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&old_desc_blk, &new_desc_blk, 0);
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if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
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old_desc_blocks = fs->super->s_first_meta_bg;
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else
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old_desc_blocks = fs->desc_blocks +
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fs->super->s_reserved_gdt_blocks;
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for (i=0; i < fs->super->s_blocks_per_group; i++, blk++) {
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if (blk >= ext2fs_blocks_count(fs->super))
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break;
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if ((blk == super_blk) ||
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(old_desc_blk && old_desc_blocks &&
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(blk >= old_desc_blk) &&
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(blk < old_desc_blk + old_desc_blocks)) ||
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(new_desc_blk && (blk == new_desc_blk)) ||
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(blk == ext2fs_block_bitmap_loc(fs, g)) ||
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(blk == ext2fs_inode_bitmap_loc(fs, g)) ||
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(blk >= ext2fs_inode_table_loc(fs, g) &&
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(blk < ext2fs_inode_table_loc(fs, g)
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+ fs->inode_blocks_per_group)))
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ext2fs_fast_mark_block_bitmap2(fs->block_map, blk);
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else
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ext2fs_fast_unmark_block_bitmap2(fs->block_map, blk);
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}
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}
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}
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/* --------------------------------------------------------------------
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*
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* Resize processing, phase 1.
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*
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* In this phase we adjust the in-memory superblock information, and
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* initialize any new parts of the inode table. The new parts of the
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* inode table are created in virgin disk space, so we can abort here
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* without any side effects.
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* --------------------------------------------------------------------
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*/
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/*
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* If the group descriptor's bitmap and inode table blocks are valid,
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* release them in the new filesystem data structure, and mark them as
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* reserved so the old inode table blocks don't get overwritten.
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*/
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static void free_gdp_blocks(ext2_filsys fs,
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ext2fs_block_bitmap reserve_blocks,
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struct ext2_group_desc *gdp)
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{
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blk_t blk;
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int j;
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if (gdp->bg_block_bitmap &&
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(gdp->bg_block_bitmap < ext2fs_blocks_count(fs->super))) {
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ext2fs_block_alloc_stats(fs, gdp->bg_block_bitmap, -1);
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ext2fs_mark_block_bitmap2(reserve_blocks,
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gdp->bg_block_bitmap);
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}
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if (gdp->bg_inode_bitmap &&
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(gdp->bg_inode_bitmap < ext2fs_blocks_count(fs->super))) {
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ext2fs_block_alloc_stats(fs, gdp->bg_inode_bitmap, -1);
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ext2fs_mark_block_bitmap2(reserve_blocks,
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gdp->bg_inode_bitmap);
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}
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if (gdp->bg_inode_table == 0 ||
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(gdp->bg_inode_table >= ext2fs_blocks_count(fs->super)))
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return;
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for (blk = gdp->bg_inode_table, j = 0;
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j < fs->inode_blocks_per_group; j++, blk++) {
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if (blk >= ext2fs_blocks_count(fs->super))
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break;
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ext2fs_block_alloc_stats(fs, blk, -1);
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ext2fs_mark_block_bitmap2(reserve_blocks, blk);
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}
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}
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/*
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* This routine is shared by the online and offline resize routines.
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* All of the information which is adjusted in memory is done here.
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*
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* The reserve_blocks parameter is only needed when shrinking the
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* filesystem.
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*/
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errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
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ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
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{
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errcode_t retval;
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blk64_t overhead = 0;
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blk64_t rem;
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blk64_t blk, group_block;
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ext2_ino_t real_end;
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blk64_t adj, old_numblocks, numblocks, adjblocks;
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unsigned long i, j, old_desc_blocks, max_group;
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unsigned int meta_bg, meta_bg_size;
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int has_super, csum_flag;
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unsigned long long new_inodes; /* u64 to check for overflow */
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double percent;
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ext2fs_blocks_count_set(fs->super, new_size);
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retry:
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fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
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fs->super->s_first_data_block,
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EXT2_BLOCKS_PER_GROUP(fs->super));
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if (fs->group_desc_count == 0)
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return EXT2_ET_TOOSMALL;
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fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
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EXT2_DESC_PER_BLOCK(fs->super));
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/*
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* Overhead is the number of bookkeeping blocks per group. It
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* includes the superblock backup, the group descriptor
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* backups, the inode bitmap, the block bitmap, and the inode
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* table.
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*/
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overhead = (int) (2 + fs->inode_blocks_per_group);
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if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
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overhead += 1 + fs->desc_blocks +
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fs->super->s_reserved_gdt_blocks;
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/*
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* See if the last group is big enough to support the
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* necessary data structures. If not, we need to get rid of
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* it.
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*/
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rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
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fs->super->s_blocks_per_group;
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if ((fs->group_desc_count == 1) && rem && (rem < overhead))
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return EXT2_ET_TOOSMALL;
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if (rem && (rem < overhead+50)) {
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ext2fs_blocks_count_set(fs->super,
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ext2fs_blocks_count(fs->super) - rem);
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goto retry;
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}
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/*
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* Adjust the number of inodes
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*/
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new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
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if (new_inodes > ~0U) {
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fprintf(stderr, _("inodes (%llu) must be less than %u"),
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new_inodes, ~0U);
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return EXT2_ET_TOO_MANY_INODES;
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}
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fs->super->s_inodes_count = fs->super->s_inodes_per_group *
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fs->group_desc_count;
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/*
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* Adjust the number of free blocks
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*/
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blk = ext2fs_blocks_count(old_fs->super);
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if (blk > ext2fs_blocks_count(fs->super))
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ext2fs_free_blocks_count_set(fs->super,
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ext2fs_free_blocks_count(fs->super) -
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(blk - ext2fs_blocks_count(fs->super)));
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else
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ext2fs_free_blocks_count_set(fs->super,
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ext2fs_free_blocks_count(fs->super) +
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(ext2fs_blocks_count(fs->super) - blk));
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|
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/*
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* Adjust the number of reserved blocks
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*/
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percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
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ext2fs_blocks_count(old_fs->super);
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ext2fs_r_blocks_count_set(fs->super,
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(percent * ext2fs_blocks_count(fs->super) /
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100.0));
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/*
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* Adjust the bitmaps for size
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*/
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retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
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fs->super->s_inodes_count,
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fs->inode_map);
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if (retval) goto errout;
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|
|
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real_end = ((EXT2_BLOCKS_PER_GROUP(fs->super)
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* fs->group_desc_count)) - 1 +
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fs->super->s_first_data_block;
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retval = ext2fs_resize_block_bitmap2(ext2fs_blocks_count(fs->super)-1,
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real_end, fs->block_map);
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|
|
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if (retval) goto errout;
|
|
|
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/*
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* Reallocate the group descriptors as necessary.
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*/
|
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if (old_fs->desc_blocks != fs->desc_blocks) {
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retval = ext2fs_resize_mem(old_fs->desc_blocks *
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fs->blocksize,
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fs->desc_blocks * fs->blocksize,
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&fs->group_desc);
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if (retval)
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goto errout;
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if (fs->desc_blocks > old_fs->desc_blocks)
|
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memset((char *) fs->group_desc +
|
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(old_fs->desc_blocks * fs->blocksize), 0,
|
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(fs->desc_blocks - old_fs->desc_blocks) *
|
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fs->blocksize);
|
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}
|
|
|
|
/*
|
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* If the resize_inode feature is set, and we are changing the
|
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* number of descriptor blocks, then adjust
|
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* s_reserved_gdt_blocks if possible to avoid needing to move
|
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* the inode table either now or in the future.
|
|
*/
|
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if ((fs->super->s_feature_compat &
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EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
|
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(old_fs->desc_blocks != fs->desc_blocks)) {
|
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int new;
|
|
|
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new = ((int) fs->super->s_reserved_gdt_blocks) +
|
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(old_fs->desc_blocks - fs->desc_blocks);
|
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if (new < 0)
|
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new = 0;
|
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if (new > (int) fs->blocksize/4)
|
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new = fs->blocksize/4;
|
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fs->super->s_reserved_gdt_blocks = new;
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}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
for (i = fs->group_desc_count;
|
|
i < old_fs->group_desc_count; i++) {
|
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free_gdp_blocks(fs, reserve_blocks,
|
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ext2fs_group_desc(old_fs,
|
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old_fs->group_desc, i));
|
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}
|
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retval = 0;
|
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goto errout;
|
|
}
|
|
|
|
/*
|
|
* Fix the count of the last (old) block group
|
|
*/
|
|
old_numblocks = (ext2fs_blocks_count(old_fs->super) -
|
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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 = fs->super->s_first_data_block +
|
|
old_fs->group_desc_count * fs->super->s_blocks_per_group;
|
|
|
|
csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
|
|
adj = old_fs->group_desc_count;
|
|
max_group = fs->group_desc_count - adj;
|
|
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
|
|
old_desc_blocks = fs->super->s_first_meta_bg;
|
|
else
|
|
old_desc_blocks = fs->desc_blocks +
|
|
fs->super->s_reserved_gdt_blocks;
|
|
for (i = 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 | EXT2_BG_INODE_ZEROED);
|
|
if (i == fs->group_desc_count-1) {
|
|
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;
|
|
if (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 (!(fs->super->s_feature_incompat &
|
|
EXT2_FEATURE_INCOMPAT_META_BG) ||
|
|
(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;
|
|
|
|
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;
|
|
int adj = 0;
|
|
errcode_t retval;
|
|
blk64_t group_block;
|
|
unsigned long i;
|
|
unsigned long max_group;
|
|
|
|
fs = rfs->new_fs;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Initialize the new block group descriptors
|
|
*/
|
|
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 = fs->super->s_first_data_block +
|
|
rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
|
|
|
|
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 = io_channel_write_blk64(fs->io,
|
|
ext2fs_inode_table_loc(fs, i),
|
|
fs->inode_blocks_per_group,
|
|
rfs->itable_buf);
|
|
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)
|
|
{
|
|
blk64_t b;
|
|
unsigned int j;
|
|
dgrp_t i;
|
|
unsigned long meta_bg_size;
|
|
unsigned int old_desc_blocks;
|
|
|
|
meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
|
|
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
|
|
old_desc_blocks = fs->super->s_first_meta_bg;
|
|
else
|
|
old_desc_blocks = fs->desc_blocks +
|
|
fs->super->s_reserved_gdt_blocks;
|
|
for (i = 0; i < fs->group_desc_count; i++) {
|
|
ext2fs_reserve_super_and_bgd(fs, i, bmap);
|
|
|
|
/*
|
|
* Mark the blocks used for the inode table
|
|
*/
|
|
for (j = 0, b = ext2fs_inode_table_loc(fs, i);
|
|
j < (unsigned int) fs->inode_blocks_per_group;
|
|
j++, b++)
|
|
ext2fs_mark_block_bitmap2(bmap, b);
|
|
|
|
/*
|
|
* Mark block used for the block bitmap
|
|
*/
|
|
ext2fs_mark_block_bitmap2(bmap,
|
|
ext2fs_block_bitmap_loc(fs, i));
|
|
|
|
/*
|
|
* Mark block used for the inode bitmap
|
|
*/
|
|
ext2fs_mark_block_bitmap2(bmap,
|
|
ext2fs_inode_bitmap_loc(fs, i));
|
|
}
|
|
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++;
|
|
} else if (IS_INODE_BM(fs, group, blk)) {
|
|
ext2fs_inode_bitmap_loc_set(fs, group, 0);
|
|
rfs->needed_blocks++;
|
|
} else if (IS_INODE_TB(fs, group, blk)) {
|
|
ext2fs_inode_table_loc_set(fs, group, 0);
|
|
rfs->needed_blocks++;
|
|
} else if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
|
|
(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)
|
|
{
|
|
int j, has_super;
|
|
dgrp_t i, max_groups, g;
|
|
blk64_t blk, group_blk;
|
|
blk64_t old_blocks, new_blocks;
|
|
unsigned int meta_bg, meta_bg_size;
|
|
errcode_t retval;
|
|
ext2_filsys fs, old_fs;
|
|
ext2fs_block_bitmap meta_bmap;
|
|
__u32 save_incompat_flag;
|
|
|
|
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 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 (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
|
|
ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
|
|
/*
|
|
* The block bitmap is uninitialized, so skip
|
|
* to the next block group.
|
|
*/
|
|
blk = ((g+1) * fs->super->s_blocks_per_group) +
|
|
fs->super->s_first_data_block - 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 (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
|
|
old_blocks = old_fs->super->s_first_meta_bg;
|
|
new_blocks = fs->super->s_first_meta_bg;
|
|
} else {
|
|
old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
|
|
new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
|
|
}
|
|
|
|
if (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) {
|
|
for (i = 0; i < max_groups; i++) {
|
|
if (!ext2fs_bg_has_super(fs, i)) {
|
|
group_blk += fs->super->s_blocks_per_group;
|
|
continue;
|
|
}
|
|
for (blk = group_blk+1+new_blocks;
|
|
blk < group_blk+1+old_blocks; blk++) {
|
|
ext2fs_block_alloc_stats2(fs, blk, -1);
|
|
rfs->needed_blocks--;
|
|
}
|
|
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);
|
|
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 (!(fs->super->s_feature_incompat &
|
|
EXT2_FEATURE_INCOMPAT_META_BG) ||
|
|
(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);
|
|
}
|
|
|
|
if (ext2fs_inode_table_loc(fs, i) &&
|
|
ext2fs_inode_bitmap_loc(fs, i) &&
|
|
ext2fs_block_bitmap_loc(fs, i))
|
|
goto next_group;
|
|
|
|
/*
|
|
* Reserve the existing meta blocks that we know
|
|
* aren't to be moved.
|
|
*/
|
|
if (ext2fs_block_bitmap_loc(fs, i))
|
|
ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
|
|
ext2fs_block_bitmap_loc(fs, i));
|
|
if (ext2fs_inode_bitmap_loc(fs, i))
|
|
ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
|
|
ext2fs_inode_bitmap_loc(fs, i));
|
|
if (ext2fs_inode_table_loc(fs, i))
|
|
for (blk = ext2fs_inode_table_loc(fs, i), j=0;
|
|
j < fs->inode_blocks_per_group ; j++, blk++)
|
|
ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
|
|
blk);
|
|
|
|
/*
|
|
* Allocate the missing data structures
|
|
*
|
|
* XXX We have a problem with FLEX_BG and off-line
|
|
* resizing where we are growing the size of the
|
|
* filesystem. ext2fs_allocate_group_table() will try
|
|
* to reserve the inode table in the desired flex_bg
|
|
* location. However, passing rfs->reserve_blocks
|
|
* doesn't work since it only has reserved the blocks
|
|
* that will be used in the new block group -- and
|
|
* with flex_bg, we can and will allocate the tables
|
|
* outside of the block group. And we can't pass in
|
|
* the fs->block_map because it doesn't handle
|
|
* overlapping inode table movements right. So for
|
|
* now, we temporarily disable flex_bg to force
|
|
* ext2fs_allocate_group_tables() to allocate the bg
|
|
* metadata in side the block group, and the restore
|
|
* it afterwards. Ugly, until we can fix this up
|
|
* right later.
|
|
*/
|
|
save_incompat_flag = fs->super->s_feature_incompat;
|
|
fs->super->s_feature_incompat &= ~EXT4_FEATURE_INCOMPAT_FLEX_BG;
|
|
retval = ext2fs_allocate_group_table(fs, i,
|
|
rfs->reserve_blocks);
|
|
fs->super->s_feature_incompat = save_incompat_flag;
|
|
if (retval)
|
|
goto errout;
|
|
|
|
/*
|
|
* For those structures that have changed, we need to
|
|
* do bookkeepping.
|
|
*/
|
|
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))
|
|
goto next_group; /* 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);
|
|
|
|
next_group:
|
|
group_blk += rfs->new_fs->super->s_blocks_per_group;
|
|
}
|
|
retval = 0;
|
|
|
|
errout:
|
|
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,
|
|
blk64_t *ret)
|
|
{
|
|
ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
|
|
blk64_t blk;
|
|
|
|
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);
|
|
*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 size;
|
|
int c;
|
|
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 = old_fs->super->s_first_data_block;
|
|
blk < ext2fs_blocks_count(old_fs->super); blk++) {
|
|
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, blk, 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;
|
|
#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
|
|
*
|
|
* --------------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
struct process_block_struct {
|
|
ext2_resize_t rfs;
|
|
ext2_ino_t ino;
|
|
struct ext2_inode * inode;
|
|
errcode_t error;
|
|
int is_dir;
|
|
int changed;
|
|
};
|
|
|
|
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 = ext2fs_extent_translate(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->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 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;
|
|
blk64_t orig_size;
|
|
blk64_t new_block;
|
|
int inode_size;
|
|
|
|
if ((rfs->old_fs->group_desc_count <=
|
|
rfs->new_fs->group_desc_count) &&
|
|
!rfs->bmap)
|
|
return 0;
|
|
|
|
/*
|
|
* Save the original size of the old filesystem, and
|
|
* temporarily set the size to be the new size if the new size
|
|
* is larger. We need to do this to avoid catching an error
|
|
* by the block iterator routines
|
|
*/
|
|
orig_size = ext2fs_blocks_count(rfs->old_fs->super);
|
|
if (orig_size < ext2fs_blocks_count(rfs->new_fs->super))
|
|
ext2fs_blocks_count_set(rfs->old_fs->super,
|
|
ext2fs_blocks_count(rfs->new_fs->super));
|
|
|
|
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;
|
|
|
|
if (ext2fs_file_acl_block(inode) && rfs->bmap) {
|
|
new_block = ext2fs_extent_translate(rfs->bmap,
|
|
ext2fs_file_acl_block(inode));
|
|
if (new_block) {
|
|
ext2fs_file_acl_block_set(inode, new_block);
|
|
retval = ext2fs_write_inode_full(rfs->old_fs,
|
|
ino, inode, inode_size);
|
|
if (retval) goto errout;
|
|
}
|
|
}
|
|
|
|
if (ext2fs_inode_has_valid_blocks(inode) &&
|
|
(rfs->bmap || pb.is_dir)) {
|
|
pb.ino = ino;
|
|
retval = ext2fs_block_iterate3(rfs->old_fs,
|
|
ino, 0, block_buf,
|
|
process_block, &pb);
|
|
if (retval)
|
|
goto errout;
|
|
if (pb.error) {
|
|
retval = pb.error;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
if (ino <= start_to_move)
|
|
continue; /* Don't need to move it. */
|
|
|
|
/*
|
|
* Find a new inode
|
|
*/
|
|
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);
|
|
if (pb.changed) {
|
|
/* Get the new version of the inode */
|
|
retval = ext2fs_read_inode_full(rfs->old_fs, ino,
|
|
inode, inode_size);
|
|
if (retval) goto errout;
|
|
}
|
|
inode->i_ctime = time(0);
|
|
retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
|
|
inode, inode_size);
|
|
if (retval) goto errout;
|
|
|
|
#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);
|
|
}
|
|
io_channel_flush(rfs->old_fs->io);
|
|
|
|
errout:
|
|
ext2fs_blocks_count_set(rfs->old_fs->super, orig_size);
|
|
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;
|
|
|
|
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 (!dirent->inode)
|
|
return 0;
|
|
|
|
new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
|
|
|
|
if (!new_inode)
|
|
return 0;
|
|
#ifdef RESIZE2FS_DEBUG
|
|
if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
|
|
printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
|
|
dir, dirent->name_len&0xFF, 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 DIRENT_ABORT;
|
|
}
|
|
|
|
return 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;
|
|
}
|
|
|
|
retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
|
|
DIRENT_FLAG_INCLUDE_EMPTY, 0,
|
|
check_and_change_inodes, &is);
|
|
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;
|
|
errcode_t retval;
|
|
int j, to_move, moved;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
return 0;
|
|
|
|
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;
|
|
|
|
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 ; j++, blk++)
|
|
ext2fs_block_alloc_stats2(fs, blk, -1);
|
|
|
|
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
|
|
return 0;
|
|
|
|
errout:
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Fix the resize inode
|
|
*/
|
|
static errcode_t fix_resize_inode(ext2_filsys fs)
|
|
{
|
|
struct ext2_inode inode;
|
|
errcode_t retval;
|
|
char * block_buf;
|
|
blk64_t blk;
|
|
|
|
if (!(fs->super->s_feature_compat &
|
|
EXT2_FEATURE_COMPAT_RESIZE_INODE))
|
|
return 0;
|
|
|
|
retval = ext2fs_get_mem(fs->blocksize, &block_buf);
|
|
if (retval) goto errout;
|
|
|
|
retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
|
|
if (retval) goto errout;
|
|
|
|
if (fs->super->s_reserved_gdt_blocks == 0) {
|
|
fs->super->s_feature_compat &=
|
|
~EXT2_FEATURE_COMPAT_RESIZE_INODE;
|
|
ext2fs_mark_super_dirty(fs);
|
|
|
|
if ((blk = inode.i_block[EXT2_DIND_BLOCK]) != 0)
|
|
ext2fs_block_alloc_stats2(fs, blk, -1);
|
|
|
|
memset(&inode, 0, sizeof(inode));
|
|
|
|
retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
|
|
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,
|
|
_("Should never happen: resize inode corrupt!\n"));
|
|
exit(1);
|
|
}
|
|
|
|
memset(block_buf, 0, fs->blocksize);
|
|
|
|
retval = io_channel_write_blk64(fs->io, inode.i_block[EXT2_DIND_BLOCK],
|
|
1, block_buf);
|
|
if (retval) goto errout;
|
|
|
|
retval = ext2fs_create_resize_inode(fs);
|
|
if (retval)
|
|
goto errout;
|
|
|
|
errout:
|
|
if (block_buf)
|
|
ext2fs_free_mem(&block_buf);
|
|
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;
|
|
int total_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 (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
|
|
old_desc_blocks = fs->super->s_first_meta_bg;
|
|
else
|
|
old_desc_blocks = fs->desc_blocks +
|
|
fs->super->s_reserved_gdt_blocks;
|
|
for (blk = fs->super->s_first_data_block;
|
|
blk < ext2fs_blocks_count(fs->super); blk++) {
|
|
if ((uninit &&
|
|
!((blk == super_blk) ||
|
|
((old_desc_blk && old_desc_blocks &&
|
|
(blk >= old_desc_blk) &&
|
|
(blk < old_desc_blk + old_desc_blocks))) ||
|
|
((new_desc_blk && (blk == new_desc_blk))) ||
|
|
(blk == ext2fs_block_bitmap_loc(fs, group)) ||
|
|
(blk == ext2fs_inode_bitmap_loc(fs, group)) ||
|
|
((blk >= ext2fs_inode_table_loc(fs, group) &&
|
|
(blk < ext2fs_inode_table_loc(fs, group)
|
|
+ fs->inode_blocks_per_group))))) ||
|
|
(!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
|
|
group_free++;
|
|
total_free++;
|
|
}
|
|
count++;
|
|
if ((count == fs->super->s_blocks_per_group) ||
|
|
(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 (fs->super->s_feature_incompat &
|
|
EXT2_FEATURE_INCOMPAT_META_BG)
|
|
old_desc_blocks = fs->super->s_first_meta_bg;
|
|
else
|
|
old_desc_blocks = fs->desc_blocks +
|
|
fs->super->s_reserved_gdt_blocks;
|
|
}
|
|
}
|
|
ext2fs_free_blocks_count_set(fs->super, total_free);
|
|
|
|
/*
|
|
* Next, calculate the inode statistics
|
|
*/
|
|
group_free = 0;
|
|
total_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_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_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 (!(fs->super->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
|
|
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[16] = inode.i_size;
|
|
fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
|
|
ext2fs_mark_super_dirty(fs);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* calcluate the minimum number of blocks the given fs can be resized to
|
|
*/
|
|
blk64_t calculate_minimum_resize_size(ext2_filsys fs)
|
|
{
|
|
ext2_ino_t inode_count;
|
|
blk64_t blks_needed, groups, data_blocks;
|
|
blk64_t grp, data_needed, last_start;
|
|
blk64_t overhead = 0;
|
|
int num_of_superblocks = 0;
|
|
int extra_groups = 0;
|
|
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) *
|
|
EXT2_BLOCKS_PER_GROUP(fs->super);
|
|
groups = ext2fs_div64_ceil(blks_needed,
|
|
EXT2_BLOCKS_PER_GROUP(fs->super));
|
|
|
|
/*
|
|
* we need to figure out how many backup superblocks we have so we can
|
|
* account for that in the metadata
|
|
*/
|
|
for (grp = 0; grp < fs->group_desc_count; grp++) {
|
|
if (ext2fs_bg_has_super(fs, grp))
|
|
num_of_superblocks++;
|
|
}
|
|
|
|
/* calculate how many blocks are needed for data */
|
|
data_needed = ext2fs_blocks_count(fs->super) -
|
|
ext2fs_free_blocks_count(fs->super);
|
|
data_needed -= SUPER_OVERHEAD(fs) * num_of_superblocks;
|
|
data_needed -= META_OVERHEAD(fs) * fs->group_desc_count;
|
|
|
|
if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
extra_groups = flexbg_size - (groups & (flexbg_size - 1));
|
|
data_needed += META_OVERHEAD(fs) * extra_groups;
|
|
extra_groups = groups % flexbg_size;
|
|
}
|
|
|
|
/*
|
|
* figure out how many data blocks we have given the number of groups
|
|
* we need for our inodes
|
|
*/
|
|
data_blocks = groups * EXT2_BLOCKS_PER_GROUP(fs->super);
|
|
last_start = 0;
|
|
for (grp = 0; grp < groups; grp++) {
|
|
overhead = META_OVERHEAD(fs);
|
|
|
|
if (ext2fs_bg_has_super(fs, grp))
|
|
overhead += SUPER_OVERHEAD(fs);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
data_blocks -= overhead;
|
|
}
|
|
|
|
/*
|
|
* if we need more group descriptors in order to accomodate our data
|
|
* then we need to add them here
|
|
*/
|
|
while (data_needed > data_blocks) {
|
|
blk64_t remainder = data_needed - data_blocks;
|
|
blk64_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 += extra_grps * EXT2_BLOCKS_PER_GROUP(fs->super);
|
|
|
|
/* ok we have to account for the last group */
|
|
overhead = META_OVERHEAD(fs);
|
|
if (ext2fs_bg_has_super(fs, groups-1))
|
|
overhead += SUPER_OVERHEAD(fs);
|
|
last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
|
|
|
|
for (grp = groups; grp < groups+extra_grps; grp++) {
|
|
overhead = META_OVERHEAD(fs);
|
|
if (ext2fs_bg_has_super(fs, grp))
|
|
overhead += SUPER_OVERHEAD(fs);
|
|
|
|
/*
|
|
* again, we need to see how much data we cram into
|
|
* all of the groups leading up to the last group
|
|
*/
|
|
if (grp != (groups + extra_grps - 1))
|
|
last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
|
|
- overhead;
|
|
|
|
data_blocks -= overhead;
|
|
}
|
|
|
|
groups += extra_grps;
|
|
extra_groups += extra_grps;
|
|
if (fs->super->s_feature_incompat
|
|
& EXT4_FEATURE_INCOMPAT_FLEX_BG
|
|
&& extra_groups > flexbg_size) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
extra_groups = flexbg_size -
|
|
(groups & (flexbg_size - 1));
|
|
data_needed += META_OVERHEAD(fs) * extra_groups;
|
|
extra_groups = groups % flexbg_size;
|
|
}
|
|
}
|
|
|
|
/* now for the fun voodoo */
|
|
overhead = META_OVERHEAD(fs);
|
|
|
|
/*
|
|
* 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 < data_needed) {
|
|
blk64_t remainder = data_needed - last_start;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (ext2fs_bg_has_super(fs, groups-1))
|
|
overhead += SUPER_OVERHEAD(fs);
|
|
|
|
/*
|
|
* 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 = (groups-1) * EXT2_BLOCKS_PER_GROUP(fs->super);
|
|
blks_needed += overhead;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
|
|
blks_needed += (ext2fs_blocks_count(fs->super) -
|
|
blks_needed)/500;
|
|
|
|
return blks_needed;
|
|
}
|