Jeff Mahoney
47cff72748
Over the years, the reiserfs kernel code has been gradually cleaned up to be more readable. This patch does the same to the progs code. Signed-off-by: Jeff Mahoney <jeffm@suse.com>
312 lines
7.8 KiB
C
312 lines
7.8 KiB
C
/*
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* Copyright 2000-2004 by Hans Reiser, licensing governed by
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* reiserfsprogs/README
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*/
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#include "resize.h"
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#include <time.h>
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static unsigned long int_node_cnt = 0, int_moved_cnt = 0;
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static unsigned long leaf_node_cnt = 0, leaf_moved_cnt = 0;
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static unsigned long unfm_node_cnt = 0, unfm_moved_cnt = 0;
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static unsigned long total_node_cnt = 0;
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static unsigned long total_moved_cnt = 0;
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static unsigned long unused_block;
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static unsigned long blocks_used;
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static int block_count_mismatch = 0;
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static reiserfs_bitmap_t *bmp;
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static struct reiserfs_super_block *ondisk_sb;
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/* abnornal exit from block reallocation process */
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static void quit_resizer(reiserfs_filsys_t *fs)
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{
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/* save changes to bitmap blocks */
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reiserfs_close(fs);
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/* leave fs in ERROR state */
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reiserfs_exit(1, "fs shrinking was not completed successfully, "
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"run reiserfsck.");
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}
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/* block moving */
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static unsigned long move_generic_block(reiserfs_filsys_t *fs,
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unsigned long block,
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unsigned long bnd, int h)
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{
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struct buffer_head *bh, *bh2;
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/* primitive fsck */
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if (block > get_sb_block_count(ondisk_sb)) {
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fprintf(stderr, "resize_reiserfs: invalid block number "
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"(%lu) found.\n", block);
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quit_resizer(fs);
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}
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/* progress bar, 3D style :) */
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if (opt_verbose)
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print_how_far(stderr, &total_node_cnt, blocks_used, 1, 0);
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else
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total_node_cnt++;
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/* infinite loop check */
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if (total_node_cnt > blocks_used && !block_count_mismatch) {
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fputs("resize_reiserfs: warning: block count exeeded\n",
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stderr);
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block_count_mismatch = 1;
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}
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if (block < bnd) /* block will not be moved */
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return 0;
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/* move wrong block */
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bh = bread(fs->fs_dev, block, fs->fs_blocksize);
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if (!bh)
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reiserfs_exit(1, "move_generic_block: bread failed.\n");
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reiserfs_bitmap_find_zero_bit(bmp, &unused_block);
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if (unused_block == 0 || unused_block >= bnd) {
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fputs("resize_reiserfs: can\'t find free block\n", stderr);
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quit_resizer(fs);
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}
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/* blocknr changing */
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bh2 = getblk(fs->fs_dev, unused_block, fs->fs_blocksize);
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memcpy(bh2->b_data, bh->b_data, bh2->b_size);
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reiserfs_bitmap_clear_bit(bmp, block);
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reiserfs_bitmap_set_bit(bmp, unused_block);
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brelse(bh);
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mark_buffer_uptodate(bh2, 1);
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mark_buffer_dirty(bh2);
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bwrite(bh2);
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brelse(bh2);
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total_moved_cnt++;
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return unused_block;
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}
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static unsigned long move_unformatted_block(reiserfs_filsys_t *fs,
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unsigned long block,
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unsigned long bnd, int h)
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{
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unsigned long b;
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unfm_node_cnt++;
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b = move_generic_block(fs, block, bnd, h);
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if (b)
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unfm_moved_cnt++;
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return b;
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}
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/* recursive function processing all tree nodes */
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static unsigned long move_formatted_block(reiserfs_filsys_t *fs,
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unsigned long block,
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unsigned long bnd, int h)
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{
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struct buffer_head *bh;
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struct item_head *ih;
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unsigned long new_blocknr = 0;
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int node_is_internal = 0;
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unsigned int i, j;
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bh = bread(fs->fs_dev, block, fs->fs_blocksize);
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if (!bh)
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reiserfs_exit(1, "move_formatted_block: bread failed");
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if (is_leaf_node(bh)) {
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leaf_node_cnt++;
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for (i = 0; i < B_NR_ITEMS(bh); i++) {
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ih = B_N_PITEM_HEAD(bh, i);
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/* skip the bad blocks. */
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if (get_key_objectid(&ih->ih_key) == BADBLOCK_OBJID &&
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get_key_dirid(&ih->ih_key) == BADBLOCK_DIRID)
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continue;
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if (is_indirect_ih(ih)) {
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__u32 *indirect;
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indirect = (__u32 *) B_I_PITEM(bh, ih);
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for (j = 0; j < I_UNFM_NUM(ih); j++) {
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unsigned long unfm_block;
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if (d32_get(indirect, j) == 0) /* hole */
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continue;
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unfm_block =
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move_unformatted_block(fs,
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d32_get
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(indirect,
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j), bnd,
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h + 1);
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if (unfm_block) {
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d32_put(indirect, j,
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unfm_block);
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mark_buffer_dirty(bh);
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}
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}
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}
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}
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} else if (is_internal_node(bh)) { /* internal node */
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int_node_cnt++;
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node_is_internal = 1;
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for (i = 0; i <= B_NR_ITEMS(bh); i++) {
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unsigned long moved_block;
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moved_block =
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move_formatted_block(fs,
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get_dc_child_blocknr(B_N_CHILD
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(bh, i)),
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bnd, h + 1);
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if (moved_block) {
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set_dc_child_blocknr(B_N_CHILD(bh, i),
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moved_block);
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mark_buffer_dirty(bh);
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}
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}
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} else {
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DIE("block (%lu) has invalid format\n", block);
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}
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if (buffer_dirty(bh)) {
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mark_buffer_uptodate(bh, 1);
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bwrite(bh);
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}
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brelse(bh);
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new_blocknr = move_generic_block(fs, block, bnd, h);
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if (new_blocknr) {
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if (node_is_internal)
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int_moved_cnt++;
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else
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leaf_moved_cnt++;
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}
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return new_blocknr;
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}
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int shrink_fs(reiserfs_filsys_t *fs, long long int blocks)
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{
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unsigned long n_root_block;
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unsigned int bmap_nr_new;
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unsigned long bad_count;
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ondisk_sb = fs->fs_ondisk_sb;
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bmap_nr_new = (blocks - 1) / (8 * fs->fs_blocksize) + 1;
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/* is shrinking possible ? */
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if (get_sb_block_count(ondisk_sb) - blocks >
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get_sb_free_blocks(ondisk_sb) + reiserfs_fs_bmap_nr(fs) -
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bmap_nr_new) {
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fprintf(stderr,
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"resize_reiserfs: can\'t shrink fs; too many "
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"blocks already allocated\n");
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return -1;
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}
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/* warn about alpha version */
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{
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int c;
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printf("You are running BETA version of reiserfs shrinker.\n"
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"This version is only for testing or VERY CAREFUL use.\n"
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"Backup of you data is recommended.\n\n"
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"Do you want to continue? [y/N]:");
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fflush(stdout);
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c = getchar();
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if (c != 'y' && c != 'Y')
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exit(1);
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}
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reiserfs_reopen(fs, O_RDWR);
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if (reiserfs_open_ondisk_bitmap(fs))
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reiserfs_exit(1, "cannot open ondisk bitmap");
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bmp = fs->fs_bitmap2;
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ondisk_sb = fs->fs_ondisk_sb;
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set_sb_fs_state(fs->fs_ondisk_sb, FS_ERROR);
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mark_buffer_uptodate(fs->fs_super_bh, 1);
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mark_buffer_dirty(fs->fs_super_bh);
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bwrite(fs->fs_super_bh);
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/* calculate number of data blocks */
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blocks_used = get_sb_block_count(fs->fs_ondisk_sb)
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- get_sb_free_blocks(fs->fs_ondisk_sb)
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- reiserfs_fs_bmap_nr(fs)
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- get_jp_journal_size(sb_jp(fs->fs_ondisk_sb))
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- REISERFS_DISK_OFFSET_IN_BYTES / fs->fs_blocksize - 2; /* superblock itself and 1 descriptor after the journal */
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unused_block = 1;
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if (opt_verbose) {
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printf("Processing the tree: ");
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fflush(stdout);
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}
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n_root_block = move_formatted_block(fs, get_sb_root_block(ondisk_sb),
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blocks, 0);
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if (n_root_block)
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set_sb_root_block(ondisk_sb, n_root_block);
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if (opt_verbose)
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printf("\n\nnodes processed (moved):\n"
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"int %lu (%lu),\n"
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"leaves %lu (%lu),\n"
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"unfm %lu (%lu),\n"
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"total %lu (%lu).\n\n",
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int_node_cnt, int_moved_cnt,
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leaf_node_cnt, leaf_moved_cnt,
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unfm_node_cnt, unfm_moved_cnt,
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(unsigned long)total_node_cnt, total_moved_cnt);
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if (block_count_mismatch) {
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fprintf(stderr, "resize_reiserfs: data block count %lu"
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" doesn\'t match data block count %lu from super block\n",
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(unsigned long)total_node_cnt, blocks_used);
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}
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{
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unsigned long l;
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/* make sure that none of truncated block are in use */
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printf("check for used blocks in truncated region\n");
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for (l = blocks; l < fs->fs_bitmap2->bm_bit_size; l++) {
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if ((l % (fs->fs_blocksize * 8)) == 0)
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continue;
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if (reiserfs_bitmap_test_bit(fs->fs_bitmap2, l))
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printf("<%lu>", l);
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}
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printf("\n");
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}
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badblock_list(fs, mark_badblock, NULL);
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if (fs->fs_badblocks_bm) {
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bad_count = reiserfs_bitmap_ones(fs->fs_badblocks_bm);
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reiserfs_shrink_bitmap(fs->fs_badblocks_bm, blocks);
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add_badblock_list(fs, 1);
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bad_count -= reiserfs_bitmap_ones(fs->fs_badblocks_bm);
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} else
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bad_count = 0;
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reiserfs_shrink_bitmap(fs->fs_bitmap2, blocks);
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set_sb_free_blocks(ondisk_sb, get_sb_free_blocks(ondisk_sb)
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- (get_sb_block_count(ondisk_sb) - blocks)
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+ (reiserfs_fs_bmap_nr(fs) - bmap_nr_new)
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+ bad_count);
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set_sb_block_count(ondisk_sb, blocks);
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set_sb_bmap_nr(ondisk_sb, bmap_nr_new);
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set_sb_bmap_nr(fs->fs_ondisk_sb,
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reiserfs_bmap_over(bmap_nr_new) ? 0 : bmap_nr_new);
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return 0;
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}
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