Contents of /tags/mkinitrd-6_1_2/busybox/libbb/inode_hash.c
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Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
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File size: 2081 byte(s)
Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2081 byte(s)
tagged 'mkinitrd-6_1_2'
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 "libbb.h" |
12 | |
13 | typedef struct ino_dev_hash_bucket_struct { |
14 | struct ino_dev_hash_bucket_struct *next; |
15 | ino_t ino; |
16 | dev_t dev; |
17 | char name[1]; |
18 | } ino_dev_hashtable_bucket_t; |
19 | |
20 | #define HASH_SIZE 311 /* Should be prime */ |
21 | #define hash_inode(i) ((i) % HASH_SIZE) |
22 | |
23 | /* array of [HASH_SIZE] elements */ |
24 | static ino_dev_hashtable_bucket_t **ino_dev_hashtable; |
25 | |
26 | /* |
27 | * Return name if statbuf->st_ino && statbuf->st_dev are recorded in |
28 | * ino_dev_hashtable, else return NULL |
29 | */ |
30 | char* FAST_FUNC is_in_ino_dev_hashtable(const struct stat *statbuf) |
31 | { |
32 | ino_dev_hashtable_bucket_t *bucket; |
33 | |
34 | if (!ino_dev_hashtable) |
35 | return NULL; |
36 | |
37 | bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)]; |
38 | while (bucket != NULL) { |
39 | if ((bucket->ino == statbuf->st_ino) |
40 | && (bucket->dev == statbuf->st_dev) |
41 | ) { |
42 | return bucket->name; |
43 | } |
44 | bucket = bucket->next; |
45 | } |
46 | return NULL; |
47 | } |
48 | |
49 | /* Add statbuf to statbuf hash table */ |
50 | void FAST_FUNC add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name) |
51 | { |
52 | int i; |
53 | ino_dev_hashtable_bucket_t *bucket; |
54 | |
55 | i = hash_inode(statbuf->st_ino); |
56 | if (!name) |
57 | name = ""; |
58 | bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + strlen(name)); |
59 | bucket->ino = statbuf->st_ino; |
60 | bucket->dev = statbuf->st_dev; |
61 | strcpy(bucket->name, name); |
62 | |
63 | if (!ino_dev_hashtable) |
64 | ino_dev_hashtable = xzalloc(HASH_SIZE * sizeof(*ino_dev_hashtable)); |
65 | |
66 | bucket->next = ino_dev_hashtable[i]; |
67 | ino_dev_hashtable[i] = bucket; |
68 | } |
69 | |
70 | #if ENABLE_FEATURE_CLEAN_UP |
71 | /* Clear statbuf hash table */ |
72 | void FAST_FUNC reset_ino_dev_hashtable(void) |
73 | { |
74 | int i; |
75 | ino_dev_hashtable_bucket_t *bucket; |
76 | |
77 | for (i = 0; ino_dev_hashtable && i < HASH_SIZE; i++) { |
78 | while (ino_dev_hashtable[i] != NULL) { |
79 | bucket = ino_dev_hashtable[i]->next; |
80 | free(ino_dev_hashtable[i]); |
81 | ino_dev_hashtable[i] = bucket; |
82 | } |
83 | } |
84 | free(ino_dev_hashtable); |
85 | ino_dev_hashtable = NULL; |
86 | } |
87 | #endif |