| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * expand.c --- expand an ext2fs directory
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| 4 | *
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| 5 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
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| 6 | *
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| 7 | * %Begin-Header%
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| 8 | * This file may be redistributed under the terms of the GNU Public
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| 9 | * License.
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| 10 | * %End-Header%
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| 11 | */
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| 12 |
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| 13 | #include <stdio.h>
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| 14 | #include <string.h>
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| 15 | #if HAVE_UNISTD_H
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| 16 | #include <unistd.h>
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| 17 | #endif
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| 18 |
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| 19 | #include "ext2_fs.h"
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| 20 | #include "ext2fs.h"
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| 21 |
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| 22 | struct expand_dir_struct {
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| 23 | int done;
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| 24 | int newblocks;
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| 25 | errcode_t err;
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| 26 | };
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| 27 |
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| 28 | static int expand_dir_proc(ext2_filsys fs,
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| 29 | blk_t *blocknr,
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| 30 | e2_blkcnt_t blockcnt,
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| 31 | blk_t ref_block EXT2FS_ATTR((unused)),
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| 32 | int ref_offset EXT2FS_ATTR((unused)),
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| 33 | void *priv_data)
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| 34 | {
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| 35 | struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
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| 36 | blk_t new_blk;
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| 37 | static blk_t last_blk = 0;
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| 38 | char *block;
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| 39 | errcode_t retval;
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| 40 |
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| 41 | if (*blocknr) {
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| 42 | last_blk = *blocknr;
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| 43 | return 0;
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| 44 | }
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| 45 | retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
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| 46 | if (retval) {
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| 47 | es->err = retval;
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| 48 | return BLOCK_ABORT;
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| 49 | }
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| 50 | if (blockcnt > 0) {
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| 51 | retval = ext2fs_new_dir_block(fs, 0, 0, &block);
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| 52 | if (retval) {
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| 53 | es->err = retval;
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| 54 | return BLOCK_ABORT;
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| 55 | }
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| 56 | es->done = 1;
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| 57 | retval = ext2fs_write_dir_block(fs, new_blk, block);
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| 58 | } else {
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| 59 | retval = ext2fs_get_mem(fs->blocksize, &block);
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| 60 | if (retval) {
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| 61 | es->err = retval;
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| 62 | return BLOCK_ABORT;
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| 63 | }
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| 64 | memset(block, 0, fs->blocksize);
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| 65 | retval = io_channel_write_blk(fs->io, new_blk, 1, block);
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| 66 | }
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| 67 | if (retval) {
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| 68 | es->err = retval;
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| 69 | return BLOCK_ABORT;
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| 70 | }
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| 71 | ext2fs_free_mem(&block);
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| 72 | *blocknr = new_blk;
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| 73 | ext2fs_block_alloc_stats(fs, new_blk, +1);
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| 74 | es->newblocks++;
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| 75 |
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| 76 | if (es->done)
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| 77 | return (BLOCK_CHANGED | BLOCK_ABORT);
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| 78 | else
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| 79 | return BLOCK_CHANGED;
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| 80 | }
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| 81 |
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| 82 | errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
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| 83 | {
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| 84 | errcode_t retval;
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| 85 | struct expand_dir_struct es;
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| 86 | struct ext2_inode inode;
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| 87 |
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| 88 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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| 89 |
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| 90 | if (!(fs->flags & EXT2_FLAG_RW))
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| 91 | return EXT2_ET_RO_FILSYS;
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| 92 |
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| 93 | if (!fs->block_map)
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| 94 | return EXT2_ET_NO_BLOCK_BITMAP;
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| 95 |
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| 96 | retval = ext2fs_check_directory(fs, dir);
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| 97 | if (retval)
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| 98 | return retval;
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| 99 |
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| 100 | es.done = 0;
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| 101 | es.err = 0;
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| 102 | es.newblocks = 0;
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| 103 |
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| 104 | retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND,
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| 105 | 0, expand_dir_proc, &es);
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| 106 |
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| 107 | if (es.err)
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| 108 | return es.err;
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| 109 | if (!es.done)
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| 110 | return EXT2_ET_EXPAND_DIR_ERR;
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| 111 |
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| 112 | /*
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| 113 | * Update the size and block count fields in the inode.
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| 114 | */
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| 115 | retval = ext2fs_read_inode(fs, dir, &inode);
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| 116 | if (retval)
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| 117 | return retval;
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| 118 |
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| 119 | inode.i_size += fs->blocksize;
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| 120 | inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
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| 121 |
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| 122 | retval = ext2fs_write_inode(fs, dir, &inode);
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| 123 | if (retval)
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| 124 | return retval;
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| 125 |
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| 126 | return 0;
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| 127 | }
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