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| 1 | +/* |
| 2 | + * ext2_block_move.c --- ext2resizer block mover |
| 3 | + * |
| 4 | + * Copyright (C) 1997 Theodore Ts'o |
| 5 | + * |
| 6 | + * %Begin-Header% |
| 7 | + * All rights reserved. |
| 8 | + * %End-Header% |
| 9 | + */ |
| 10 | + |
| 11 | +#include "resize2fs.h" |
| 12 | + |
| 13 | +struct process_block_struct { |
| 14 | + ino_t ino; |
| 15 | + struct ext2_inode * inode; |
| 16 | + ext2_extent bmap; |
| 17 | + errcode_t error; |
| 18 | + int is_dir; |
| 19 | + int flags; |
| 20 | +}; |
| 21 | + |
| 22 | +static int process_block(ext2_filsys fs, blk_t *block_nr, |
| 23 | + int blockcnt, blk_t ref_block, |
| 24 | + int ref_offset, void *private) |
| 25 | +{ |
| 26 | + struct process_block_struct *pb = private; |
| 27 | + errcode_t retval; |
| 28 | + blk_t block, new; |
| 29 | + int ret = 0; |
| 30 | + |
| 31 | + block = *block_nr; |
| 32 | + |
| 33 | + new = ext2fs_extent_translate(pb->bmap, block); |
| 34 | + if (new) { |
| 35 | + *block_nr = new; |
| 36 | + ret |= BLOCK_CHANGED; |
| 37 | + if (pb->flags & RESIZE_DEBUG_BMOVE) |
| 38 | + printf("ino=%ld, blockcnt=%d, %u->%u\n", pb->ino, |
| 39 | + blockcnt, block, new); |
| 40 | + } |
| 41 | + |
| 42 | + if (pb->is_dir) { |
| 43 | + retval = ext2fs_add_dir_block(fs->dblist, pb->ino, |
| 44 | + *block_nr, blockcnt); |
| 45 | + if (retval) { |
| 46 | + pb->error = retval; |
| 47 | + ret |= BLOCK_ABORT; |
| 48 | + } |
| 49 | + } |
| 50 | + |
| 51 | + return ret; |
| 52 | +} |
| 53 | + |
| 54 | +errcode_t ext2fs_block_move(ext2_resize_t rfs) |
| 55 | +{ |
| 56 | + ext2_extent bmap; |
| 57 | + blk_t blk, old, new; |
| 58 | + ext2_filsys fs = rfs->new_fs; |
| 59 | + ext2_filsys old_fs = rfs->old_fs; |
| 60 | + ino_t ino; |
| 61 | + struct ext2_inode inode; |
| 62 | + errcode_t retval; |
| 63 | + struct process_block_struct pb; |
| 64 | + ext2_inode_scan scan = 0; |
| 65 | + char *block_buf; |
| 66 | + int size, c; |
| 67 | + int to_move, moved; |
| 68 | + ext2_sim_progmeter progress = 0; |
| 69 | + |
| 70 | + new = fs->super->s_first_data_block; |
| 71 | + if (!rfs->itable_buf) { |
| 72 | + rfs->itable_buf = malloc(fs->blocksize * |
| 73 | + fs->inode_blocks_per_group); |
| 74 | + if (!rfs->itable_buf) |
| 75 | + return ENOMEM; |
| 76 | + } |
| 77 | + retval = ext2fs_create_extent_table(&bmap, 0); |
| 78 | + if (retval) |
| 79 | + return retval; |
| 80 | + |
| 81 | + /* |
| 82 | + * The first step is to figure out where all of the blocks |
| 83 | + * will go. |
| 84 | + */ |
| 85 | + to_move = moved = 0; |
| 86 | + for (blk = old_fs->super->s_first_data_block; |
| 87 | + blk < old_fs->super->s_blocks_count; blk++) { |
| 88 | + if (!ext2fs_test_block_bitmap(old_fs->block_map, blk)) |
| 89 | + continue; |
| 90 | + if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk)) |
| 91 | + continue; |
| 92 | + |
| 93 | + while (1) { |
| 94 | + if (new >= fs->super->s_blocks_count) { |
| 95 | + retval = ENOSPC; |
| 96 | + goto errout; |
| 97 | + } |
| 98 | + if (!ext2fs_test_block_bitmap(fs->block_map, new) && |
| 99 | + !ext2fs_test_block_bitmap(rfs->reserve_blocks, |
| 100 | + new)) |
| 101 | + break; |
| 102 | + new++; |
| 103 | + } |
| 104 | + ext2fs_mark_block_bitmap(fs->block_map, new); |
| 105 | + ext2fs_add_extent_entry(bmap, blk, new); |
| 106 | + to_move++; |
| 107 | + } |
| 108 | + if (to_move == 0) |
| 109 | + return 0; |
| 110 | + /* |
| 111 | + * Step two is to actually move the blocks |
| 112 | + */ |
| 113 | + retval = ext2fs_iterate_extent(bmap, 0, 0, 0); |
| 114 | + if (retval) goto errout; |
| 115 | + |
| 116 | + if (rfs->flags & RESIZE_PERCENT_COMPLETE) { |
| 117 | + retval = ext2fs_progress_init(&progress, |
| 118 | + "Relocating blocks", 30, 40, to_move, 0); |
| 119 | + if (retval) |
| 120 | + return retval; |
| 121 | + } |
| 122 | + |
| 123 | + while (1) { |
| 124 | + retval = ext2fs_iterate_extent(bmap, &old, &new, &size); |
| 125 | + if (retval) goto errout; |
| 126 | + if (!size) |
| 127 | + break; |
| 128 | + if (rfs->flags & RESIZE_DEBUG_BMOVE) |
| 129 | + printf("Moving %d blocks %u->%u\n", size, |
| 130 | + old, new); |
| 131 | + do { |
| 132 | + c = size; |
| 133 | + if (c > fs->inode_blocks_per_group) |
| 134 | + c = fs->inode_blocks_per_group; |
| 135 | + retval = io_channel_read_blk(fs->io, old, c, |
| 136 | + rfs->itable_buf); |
| 137 | + if (retval) goto errout; |
| 138 | + retval = io_channel_write_blk(fs->io, new, c, |
| 139 | + rfs->itable_buf); |
| 140 | + if (retval) goto errout; |
| 141 | + size -= c; |
| 142 | + new += c; |
| 143 | + old += c; |
| 144 | + moved += c; |
| 145 | + io_channel_flush(fs->io); |
| 146 | + if (progress) |
| 147 | + ext2fs_progress_update(progress, moved); |
| 148 | + } while (size > 0); |
| 149 | + io_channel_flush(fs->io); |
| 150 | + } |
| 151 | + if (progress) { |
| 152 | + ext2fs_progress_close(progress); |
| 153 | + progress = 0; |
| 154 | + } |
| 155 | + |
| 156 | + /* |
| 157 | + * Step 3 is where we update the block pointers |
| 158 | + */ |
| 159 | + retval = ext2fs_open_inode_scan(old_fs, 0, &scan); |
| 160 | + if (retval) goto errout; |
| 161 | + |
| 162 | + pb.error = 0; |
| 163 | + pb.bmap = bmap; |
| 164 | + pb.flags = rfs->flags; |
| 165 | + |
| 166 | + block_buf = malloc(old_fs->blocksize * 3); |
| 167 | + if (!block_buf) { |
| 168 | + retval = ENOMEM; |
| 169 | + goto errout; |
| 170 | + } |
| 171 | + |
| 172 | + /* |
| 173 | + * We're going to initialize the dblist while we're at it. |
| 174 | + */ |
| 175 | + if (old_fs->dblist) { |
| 176 | + ext2fs_free_dblist(old_fs->dblist); |
| 177 | + old_fs->dblist = NULL; |
| 178 | + } |
| 179 | + retval = ext2fs_init_dblist(old_fs, 0); |
| 180 | + if (retval) |
| 181 | + return retval; |
| 182 | + |
| 183 | + retval = ext2fs_get_next_inode(scan, &ino, &inode); |
| 184 | + if (retval) goto errout; |
| 185 | + |
| 186 | + if (rfs->flags & RESIZE_PERCENT_COMPLETE) { |
| 187 | + retval = ext2fs_progress_init(&progress, |
| 188 | + "Updating block references", 30, 40, |
| 189 | + old_fs->super->s_inodes_count, 0); |
| 190 | + if (retval) |
| 191 | + return retval; |
| 192 | + } |
| 193 | + |
| 194 | + while (ino) { |
| 195 | + if ((inode.i_links_count == 0) || |
| 196 | + !ext2fs_inode_has_valid_blocks(&inode)) |
| 197 | + goto next; |
| 198 | + |
| 199 | + pb.ino = ino; |
| 200 | + pb.inode = &inode; |
| 201 | + |
| 202 | + pb.is_dir = LINUX_S_ISDIR(inode.i_mode); |
| 203 | + |
| 204 | + retval = ext2fs_block_iterate2(old_fs, ino, 0, block_buf, |
| 205 | + process_block, &pb); |
| 206 | + if (retval) |
| 207 | + goto errout; |
| 208 | + if (pb.error) { |
| 209 | + retval = pb.error; |
| 210 | + goto errout; |
| 211 | + } |
| 212 | + |
| 213 | + next: |
| 214 | + if (progress) |
| 215 | + ext2fs_progress_update(progress, ino); |
| 216 | + retval = ext2fs_get_next_inode(scan, &ino, &inode); |
| 217 | + if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE) |
| 218 | + goto next; |
| 219 | + } |
| 220 | + retval = 0; |
| 221 | +errout: |
| 222 | + if (progress) |
| 223 | + ext2fs_progress_close(progress); |
| 224 | + |
| 225 | + ext2fs_free_extent_table(bmap); |
| 226 | + if (scan) |
| 227 | + ext2fs_close_inode_scan(scan); |
| 228 | + return retval; |
| 229 | +} |
| 230 | + |
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