Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 1 | /* |
| 2 | * dirinfo.c --- maintains the directory information table for e2fsck. |
| 3 | * |
| 4 | * Copyright (C) 1993 Theodore Ts'o. This file may be redistributed |
| 5 | * under the terms of the GNU Public License. |
| 6 | */ |
| 7 | |
Theodore Ts'o | d1154eb | 2011-09-18 17:34:37 -0400 | [diff] [blame] | 8 | #include "config.h" |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 9 | #include "e2fsck.h" |
| 10 | #ifdef ENABLE_HTREE |
| 11 | |
| 12 | /* |
| 13 | * This subroutine is called during pass1 to create a directory info |
| 14 | * entry. During pass1, the passed-in parent is 0; it will get filled |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 15 | * in during pass2. |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 16 | */ |
| 17 | void e2fsck_add_dx_dir(e2fsck_t ctx, ext2_ino_t ino, int num_blocks) |
| 18 | { |
| 19 | struct dx_dir_info *dir; |
| 20 | int i, j; |
| 21 | errcode_t retval; |
| 22 | unsigned long old_size; |
| 23 | |
| 24 | #if 0 |
| 25 | printf("add_dx_dir_info for inode %lu...\n", ino); |
| 26 | #endif |
| 27 | if (!ctx->dx_dir_info) { |
| 28 | ctx->dx_dir_info_count = 0; |
| 29 | ctx->dx_dir_info_size = 100; /* Guess */ |
| 30 | ctx->dx_dir_info = (struct dx_dir_info *) |
| 31 | e2fsck_allocate_memory(ctx, ctx->dx_dir_info_size |
| 32 | * sizeof (struct dx_dir_info), |
| 33 | "directory map"); |
| 34 | } |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 35 | |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 36 | if (ctx->dx_dir_info_count >= ctx->dx_dir_info_size) { |
| 37 | old_size = ctx->dx_dir_info_size * sizeof(struct dx_dir_info); |
| 38 | ctx->dx_dir_info_size += 10; |
| 39 | retval = ext2fs_resize_mem(old_size, ctx->dx_dir_info_size * |
| 40 | sizeof(struct dx_dir_info), |
Theodore Ts'o | c4e3d3f | 2003-08-01 09:41:07 -0400 | [diff] [blame] | 41 | &ctx->dx_dir_info); |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 42 | if (retval) { |
| 43 | ctx->dx_dir_info_size -= 10; |
| 44 | return; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Normally, add_dx_dir_info is called with each inode in |
| 50 | * sequential order; but once in a while (like when pass 3 |
| 51 | * needs to recreate the root directory or lost+found |
| 52 | * directory) it is called out of order. In those cases, we |
| 53 | * need to move the dx_dir_info entries down to make room, since |
| 54 | * the dx_dir_info array needs to be sorted by inode number for |
| 55 | * get_dx_dir_info()'s sake. |
| 56 | */ |
| 57 | if (ctx->dx_dir_info_count && |
| 58 | ctx->dx_dir_info[ctx->dx_dir_info_count-1].ino >= ino) { |
| 59 | for (i = ctx->dx_dir_info_count-1; i > 0; i--) |
| 60 | if (ctx->dx_dir_info[i-1].ino < ino) |
| 61 | break; |
| 62 | dir = &ctx->dx_dir_info[i]; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 63 | if (dir->ino != ino) |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 64 | for (j = ctx->dx_dir_info_count++; j > i; j--) |
| 65 | ctx->dx_dir_info[j] = ctx->dx_dir_info[j-1]; |
| 66 | } else |
| 67 | dir = &ctx->dx_dir_info[ctx->dx_dir_info_count++]; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 68 | |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 69 | dir->ino = ino; |
| 70 | dir->numblocks = num_blocks; |
| 71 | dir->hashversion = 0; |
| 72 | dir->dx_block = e2fsck_allocate_memory(ctx, num_blocks |
| 73 | * sizeof (struct dx_dirblock_info), |
| 74 | "dx_block info array"); |
| 75 | |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * get_dx_dir_info() --- given an inode number, try to find the directory |
| 80 | * information entry for it. |
| 81 | */ |
| 82 | struct dx_dir_info *e2fsck_get_dx_dir_info(e2fsck_t ctx, ext2_ino_t ino) |
| 83 | { |
| 84 | int low, high, mid; |
| 85 | |
| 86 | low = 0; |
| 87 | high = ctx->dx_dir_info_count-1; |
| 88 | if (!ctx->dx_dir_info) |
| 89 | return 0; |
| 90 | if (ino == ctx->dx_dir_info[low].ino) |
| 91 | return &ctx->dx_dir_info[low]; |
| 92 | if (ino == ctx->dx_dir_info[high].ino) |
| 93 | return &ctx->dx_dir_info[high]; |
| 94 | |
| 95 | while (low < high) { |
| 96 | mid = (low+high)/2; |
| 97 | if (mid == low || mid == high) |
| 98 | break; |
| 99 | if (ino == ctx->dx_dir_info[mid].ino) |
| 100 | return &ctx->dx_dir_info[mid]; |
| 101 | if (ino < ctx->dx_dir_info[mid].ino) |
| 102 | high = mid; |
| 103 | else |
| 104 | low = mid; |
| 105 | } |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Free the dx_dir_info structure when it isn't needed any more. |
| 111 | */ |
| 112 | void e2fsck_free_dx_dir_info(e2fsck_t ctx) |
| 113 | { |
| 114 | int i; |
| 115 | struct dx_dir_info *dir; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 116 | |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 117 | if (ctx->dx_dir_info) { |
| 118 | dir = ctx->dx_dir_info; |
Theodore Ts'o | 23f75f6 | 2009-06-15 03:50:07 -0400 | [diff] [blame] | 119 | for (i=0; i < ctx->dx_dir_info_count; i++,dir++) { |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 120 | if (dir->dx_block) { |
Theodore Ts'o | c4e3d3f | 2003-08-01 09:41:07 -0400 | [diff] [blame] | 121 | ext2fs_free_mem(&dir->dx_block); |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 122 | dir->dx_block = 0; |
| 123 | } |
| 124 | } |
Theodore Ts'o | c4e3d3f | 2003-08-01 09:41:07 -0400 | [diff] [blame] | 125 | ext2fs_free_mem(&ctx->dx_dir_info); |
Theodore Ts'o | 8fdc998 | 2002-06-25 23:26:34 -0400 | [diff] [blame] | 126 | ctx->dx_dir_info = 0; |
| 127 | } |
| 128 | ctx->dx_dir_info_size = 0; |
| 129 | ctx->dx_dir_info_count = 0; |
| 130 | } |
| 131 | |
| 132 | /* |
| 133 | * Return the count of number of directories in the dx_dir_info structure |
| 134 | */ |
| 135 | int e2fsck_get_num_dx_dirinfo(e2fsck_t ctx) |
| 136 | { |
| 137 | return ctx->dx_dir_info_count; |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * A simple interator function |
| 142 | */ |
| 143 | struct dx_dir_info *e2fsck_dx_dir_info_iter(e2fsck_t ctx, int *control) |
| 144 | { |
| 145 | if (*control >= ctx->dx_dir_info_count) |
| 146 | return 0; |
| 147 | |
| 148 | return(ctx->dx_dir_info + (*control)++); |
| 149 | } |
| 150 | |
| 151 | #endif /* ENABLE_HTREE */ |