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