Contents of /trunk/mkinitrd-magellan/busybox/libbb/inode_hash.c
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 2106 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 2106 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) many different people. |
6 | * If you wrote this, please acknowledge your work. |
7 | * |
8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
9 | */ |
10 | |
11 | #include <stdio.h> |
12 | #include <stdlib.h> |
13 | #include <string.h> |
14 | #include "libbb.h" |
15 | |
16 | #define HASH_SIZE 311 /* Should be prime */ |
17 | #define hash_inode(i) ((i) % HASH_SIZE) |
18 | |
19 | typedef struct ino_dev_hash_bucket_struct { |
20 | struct ino_dev_hash_bucket_struct *next; |
21 | ino_t ino; |
22 | dev_t dev; |
23 | char name[1]; |
24 | } ino_dev_hashtable_bucket_t; |
25 | |
26 | static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE]; |
27 | |
28 | /* |
29 | * Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in |
30 | * `ino_dev_hashtable', else return 0 |
31 | * |
32 | * If NAME is a non-NULL pointer to a character pointer, and there is |
33 | * a match, then set *NAME to the value of the name slot in that |
34 | * bucket. |
35 | */ |
36 | int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name) |
37 | { |
38 | ino_dev_hashtable_bucket_t *bucket; |
39 | |
40 | bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)]; |
41 | while (bucket != NULL) { |
42 | if ((bucket->ino == statbuf->st_ino) && |
43 | (bucket->dev == statbuf->st_dev)) |
44 | { |
45 | if (name) *name = bucket->name; |
46 | return 1; |
47 | } |
48 | bucket = bucket->next; |
49 | } |
50 | return 0; |
51 | } |
52 | |
53 | /* Add statbuf to statbuf hash table */ |
54 | void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name) |
55 | { |
56 | int i; |
57 | size_t s; |
58 | ino_dev_hashtable_bucket_t *bucket; |
59 | |
60 | i = hash_inode(statbuf->st_ino); |
61 | s = name ? strlen(name) : 0; |
62 | bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s); |
63 | bucket->ino = statbuf->st_ino; |
64 | bucket->dev = statbuf->st_dev; |
65 | if (name) |
66 | strcpy(bucket->name, name); |
67 | else |
68 | bucket->name[0] = '\0'; |
69 | bucket->next = ino_dev_hashtable[i]; |
70 | ino_dev_hashtable[i] = bucket; |
71 | } |
72 | |
73 | #ifdef CONFIG_FEATURE_CLEAN_UP |
74 | /* Clear statbuf hash table */ |
75 | void reset_ino_dev_hashtable(void) |
76 | { |
77 | int i; |
78 | ino_dev_hashtable_bucket_t *bucket; |
79 | |
80 | for (i = 0; i < HASH_SIZE; i++) { |
81 | while (ino_dev_hashtable[i] != NULL) { |
82 | bucket = ino_dev_hashtable[i]->next; |
83 | free(ino_dev_hashtable[i]); |
84 | ino_dev_hashtable[i] = bucket; |
85 | } |
86 | } |
87 | } |
88 | #endif |