1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/*
* linux/fs/hfs/sysdep.c
*
* Copyright (C) 1996 Paul H. Hargrove
* This file may be distributed under the terms of the GNU Public License.
*
* This file contains the code to do various system dependent things.
*
* "XXX" in a comment is a note to myself to consider changing something.
*
* In function preconditions the term "valid" applied to a pointer to
* a structure means that the pointer is non-NULL and the structure it
* points to has all fields initialized to consistent values.
*/
#include "hfs.h"
#include <linux/hfs_fs_sb.h>
#include <linux/hfs_fs_i.h>
#include <linux/hfs_fs.h>
static int hfs_revalidate_dentry(struct dentry *, int);
static int hfs_hash_dentry(struct dentry *, struct qstr *);
static int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
static void hfs_dentry_iput(struct dentry *, struct inode *);
struct dentry_operations hfs_dentry_operations =
{
hfs_revalidate_dentry, /* d_revalidate(struct dentry *) */
hfs_hash_dentry, /* d_hash */
hfs_compare_dentry, /* d_compare */
NULL, /* d_delete(struct dentry *) */
NULL, /* d_release(struct dentry *) */
hfs_dentry_iput /* d_iput(struct dentry *, struct inode *) */
};
/*
* hfs_buffer_get()
*
* Return a buffer for the 'block'th block of the media.
* If ('read'==0) then the buffer is not read from disk.
*/
hfs_buffer hfs_buffer_get(hfs_sysmdb sys_mdb, int block, int read) {
hfs_buffer tmp = HFS_BAD_BUFFER;
if (read) {
tmp = bread(sys_mdb->s_dev, block, HFS_SECTOR_SIZE);
} else {
tmp = getblk(sys_mdb->s_dev, block, HFS_SECTOR_SIZE);
if (tmp) {
mark_buffer_uptodate(tmp, 1);
}
}
if (!tmp) {
hfs_error("hfs_fs: unable to read block 0x%08x from dev %s\n",
block, hfs_mdb_name(sys_mdb));
}
return tmp;
}
/* dentry case-handling: just lowercase everything */
/* hfs_strhash now uses the same hashing function as the dcache. */
static int hfs_hash_dentry(struct dentry *dentry, struct qstr *this)
{
if (this->len > HFS_NAMELEN)
return 0;
this->hash = hfs_strhash(this->name, this->len);
return 0;
}
/* return 1 on failure and 0 on success */
static int hfs_compare_dentry(struct dentry *dentry, struct qstr *a,
struct qstr *b)
{
if (a->len != b->len) return 1;
if (a->len > HFS_NAMELEN)
return 1;
return !hfs_streq(a->name, a->len, b->name, b->len);
}
static void hfs_dentry_iput(struct dentry *dentry, struct inode *inode)
{
struct hfs_cat_entry *entry = HFS_I(inode)->entry;
entry->sys_entry[HFS_ITYPE_TO_INT(HFS_ITYPE(inode->i_ino))] = NULL;
iput(inode);
}
static int hfs_revalidate_dentry(struct dentry *dentry, int flags)
{
struct inode *inode = dentry->d_inode;
int diff;
/* fix up inode on a timezone change */
if (inode &&
(diff = (hfs_to_utc(0) - HFS_I(inode)->tz_secondswest))) {
inode->i_ctime += diff;
inode->i_atime += diff;
inode->i_mtime += diff;
HFS_I(inode)->tz_secondswest += diff;
}
return 1;
}
|
