| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * expand.c --- expand an ext2fs directory |
| 3 | * |
| 4 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o. |
| 5 | * |
| 6 | * %Begin-Header% |
| 7 | * This file may be redistributed under the terms of the GNU Library |
| 8 | * General Public License, version 2. |
| 9 | * %End-Header% |
| 10 | */ |
| 11 | |
| 12 | #include "config.h" |
| 13 | #include <stdio.h> |
| 14 | #include <string.h> |
| 15 | #if HAVE_UNISTD_H |
| 16 | #include <unistd.h> |
| 17 | #endif |
| 18 | |
| 19 | #include "ext2_fs.h" |
| 20 | #include "ext2fs.h" |
| 21 | |
| 22 | struct expand_dir_struct { |
| 23 | int done; |
| 24 | int newblocks; |
| 25 | blk64_t goal; |
| 26 | errcode_t err; |
| 27 | }; |
| 28 | |
| 29 | static int expand_dir_proc(ext2_filsys fs, |
| 30 | blk64_t *blocknr, |
| 31 | e2_blkcnt_t blockcnt, |
| 32 | blk64_t ref_block EXT2FS_ATTR((unused)), |
| 33 | int ref_offset EXT2FS_ATTR((unused)), |
| 34 | void *priv_data) |
| 35 | { |
| 36 | struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data; |
| 37 | blk64_t new_blk; |
| 38 | char *block; |
| 39 | errcode_t retval; |
| 40 | |
| 41 | if (*blocknr) { |
| 42 | if (blockcnt >= 0) |
| 43 | es->goal = *blocknr; |
| 44 | return 0; |
| 45 | } |
| 46 | if (blockcnt && |
| 47 | (EXT2FS_B2C(fs, es->goal) == EXT2FS_B2C(fs, es->goal+1))) |
| 48 | new_blk = es->goal+1; |
| 49 | else { |
| 50 | es->goal &= ~EXT2FS_CLUSTER_MASK(fs); |
| 51 | retval = ext2fs_new_block2(fs, es->goal, 0, &new_blk); |
| 52 | if (retval) { |
| 53 | es->err = retval; |
| 54 | return BLOCK_ABORT; |
| 55 | } |
| 56 | es->newblocks++; |
| 57 | ext2fs_block_alloc_stats2(fs, new_blk, +1); |
| 58 | } |
| 59 | if (blockcnt > 0) { |
| 60 | retval = ext2fs_new_dir_block(fs, 0, 0, &block); |
| 61 | if (retval) { |
| 62 | es->err = retval; |
| 63 | return BLOCK_ABORT; |
| 64 | } |
| 65 | es->done = 1; |
| 66 | retval = ext2fs_write_dir_block(fs, new_blk, block); |
| 67 | } else { |
| 68 | retval = ext2fs_get_mem(fs->blocksize, &block); |
| 69 | if (retval) { |
| 70 | es->err = retval; |
| 71 | return BLOCK_ABORT; |
| 72 | } |
| 73 | memset(block, 0, fs->blocksize); |
| 74 | retval = io_channel_write_blk64(fs->io, new_blk, 1, block); |
| 75 | } |
| 76 | if (blockcnt >= 0) |
| 77 | es->goal = new_blk; |
| 78 | if (retval) { |
| 79 | es->err = retval; |
| 80 | return BLOCK_ABORT; |
| 81 | } |
| 82 | ext2fs_free_mem(&block); |
| 83 | *blocknr = new_blk; |
| 84 | |
| 85 | if (es->done) |
| 86 | return (BLOCK_CHANGED | BLOCK_ABORT); |
| 87 | else |
| 88 | return BLOCK_CHANGED; |
| 89 | } |
| 90 | |
| 91 | errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir) |
| 92 | { |
| 93 | errcode_t retval; |
| 94 | struct expand_dir_struct es; |
| 95 | struct ext2_inode inode; |
| 96 | |
| 97 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| 98 | |
| 99 | if (!(fs->flags & EXT2_FLAG_RW)) |
| 100 | return EXT2_ET_RO_FILSYS; |
| 101 | |
| 102 | if (!fs->block_map) |
| 103 | return EXT2_ET_NO_BLOCK_BITMAP; |
| 104 | |
| 105 | retval = ext2fs_check_directory(fs, dir); |
| 106 | if (retval) |
| 107 | return retval; |
| 108 | |
| 109 | es.done = 0; |
| 110 | es.err = 0; |
| 111 | es.goal = 0; |
| 112 | es.newblocks = 0; |
| 113 | |
| 114 | retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND, |
| 115 | 0, expand_dir_proc, &es); |
| 116 | |
| 117 | if (es.err) |
| 118 | return es.err; |
| 119 | if (!es.done) |
| 120 | return EXT2_ET_EXPAND_DIR_ERR; |
| 121 | |
| 122 | /* |
| 123 | * Update the size and block count fields in the inode. |
| 124 | */ |
| 125 | retval = ext2fs_read_inode(fs, dir, &inode); |
| 126 | if (retval) |
| 127 | return retval; |
| 128 | |
| 129 | inode.i_size += fs->blocksize; |
| 130 | ext2fs_iblk_add_blocks(fs, &inode, es.newblocks); |
| 131 | |
| 132 | retval = ext2fs_write_inode(fs, dir, &inode); |
| 133 | if (retval) |
| 134 | return retval; |
| 135 | |
| 136 | return 0; |
| 137 | } |