1 | /*
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2 | * expand.c --- expand an ext2fs directory
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3 | *
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4 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
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5 | *
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6 | * %Begin-Header%
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7 | * This file may be redistributed under the terms of the GNU Public
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8 | * License.
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9 | * %End-Header%
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10 | */
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11 |
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12 | #include <stdio.h>
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13 | #include <string.h>
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14 | #if HAVE_UNISTD_H
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15 | #include <unistd.h>
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16 | #endif
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17 |
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18 | #include "ext2_fs.h"
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19 | #include "ext2fs.h"
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20 |
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21 | struct expand_dir_struct {
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22 | int done;
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23 | int newblocks;
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24 | errcode_t err;
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25 | };
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26 |
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27 | static int expand_dir_proc(ext2_filsys fs,
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28 | blk_t *blocknr,
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29 | e2_blkcnt_t blockcnt,
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30 | blk_t ref_block EXT2FS_ATTR((unused)),
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31 | int ref_offset EXT2FS_ATTR((unused)),
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32 | void *priv_data)
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33 | {
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34 | struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
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35 | blk_t new_blk;
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36 | static blk_t last_blk = 0;
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37 | char *block;
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38 | errcode_t retval;
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39 |
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40 | if (*blocknr) {
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41 | last_blk = *blocknr;
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42 | return 0;
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43 | }
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44 | retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
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45 | if (retval) {
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46 | es->err = retval;
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47 | return BLOCK_ABORT;
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48 | }
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49 | if (blockcnt > 0) {
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50 | retval = ext2fs_new_dir_block(fs, 0, 0, &block);
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51 | if (retval) {
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52 | es->err = retval;
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53 | return BLOCK_ABORT;
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54 | }
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55 | es->done = 1;
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56 | retval = ext2fs_write_dir_block(fs, new_blk, block);
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57 | } else {
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58 | retval = ext2fs_get_mem(fs->blocksize, &block);
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59 | if (retval) {
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60 | es->err = retval;
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61 | return BLOCK_ABORT;
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62 | }
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63 | memset(block, 0, fs->blocksize);
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64 | retval = io_channel_write_blk(fs->io, new_blk, 1, block);
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65 | }
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66 | if (retval) {
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67 | es->err = retval;
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68 | return BLOCK_ABORT;
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69 | }
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70 | ext2fs_free_mem(&block);
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71 | *blocknr = new_blk;
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72 | ext2fs_block_alloc_stats(fs, new_blk, +1);
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73 | es->newblocks++;
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74 |
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75 | if (es->done)
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76 | return (BLOCK_CHANGED | BLOCK_ABORT);
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77 | else
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78 | return BLOCK_CHANGED;
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79 | }
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80 |
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81 | errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
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82 | {
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83 | errcode_t retval;
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84 | struct expand_dir_struct es;
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85 | struct ext2_inode inode;
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86 |
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87 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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88 |
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89 | if (!(fs->flags & EXT2_FLAG_RW))
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90 | return EXT2_ET_RO_FILSYS;
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91 |
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92 | if (!fs->block_map)
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93 | return EXT2_ET_NO_BLOCK_BITMAP;
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94 |
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95 | retval = ext2fs_check_directory(fs, dir);
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96 | if (retval)
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97 | return retval;
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98 |
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99 | es.done = 0;
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100 | es.err = 0;
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101 | es.newblocks = 0;
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102 |
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103 | retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND,
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104 | 0, expand_dir_proc, &es);
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105 |
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106 | if (es.err)
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107 | return es.err;
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108 | if (!es.done)
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109 | return EXT2_ET_EXPAND_DIR_ERR;
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110 |
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111 | /*
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112 | * Update the size and block count fields in the inode.
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113 | */
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114 | retval = ext2fs_read_inode(fs, dir, &inode);
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115 | if (retval)
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116 | return retval;
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117 |
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118 | inode.i_size += fs->blocksize;
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119 | inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
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120 |
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121 | retval = ext2fs_write_inode(fs, dir, &inode);
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122 | if (retval)
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123 | return retval;
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124 |
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125 | return 0;
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126 | }
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