Theodore Ts'o | c762c8e | 1997-06-17 03:52:12 +0000 | [diff] [blame] | 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 | |