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1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, |
6 | * modify, copy, or redistribute it subject to the terms and conditions |
7 | * of the GNU General Public License version 2. |
8 | */ |
9 | |
10 | #ifndef __DIR_DOT_H__ |
11 | #define __DIR_DOT_H__ |
12 | |
13 | #include <linux/dcache.h> |
14 | #include <linux/crc32.h> |
15 | |
16 | struct inode; |
17 | struct gfs2_inode; |
18 | struct gfs2_inum; |
19 | |
20 | struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *filename); |
21 | int gfs2_dir_check(struct inode *dir, const struct qstr *filename, |
22 | const struct gfs2_inode *ip); |
23 | int gfs2_dir_add(struct inode *inode, const struct qstr *filename, |
24 | const struct gfs2_inode *ip, unsigned int type); |
25 | int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename); |
26 | int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque, |
27 | filldir_t filldir); |
28 | int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, |
29 | const struct gfs2_inode *nip, unsigned int new_type); |
30 | |
31 | int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); |
32 | |
33 | int gfs2_diradd_alloc_required(struct inode *dir, |
34 | const struct qstr *filename); |
35 | int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, |
36 | struct buffer_head **bhp); |
37 | |
38 | static inline u32 gfs2_disk_hash(const char *data, int len) |
39 | { |
40 | return crc32_le((u32)~0, data, len) ^ (u32)~0; |
41 | } |
42 | |
43 | |
44 | static inline void gfs2_str2qstr(struct qstr *name, const char *fname) |
45 | { |
46 | name->name = fname; |
47 | name->len = strlen(fname); |
48 | name->hash = gfs2_disk_hash(name->name, name->len); |
49 | } |
50 | |
51 | /* N.B. This probably ought to take inum & type as args as well */ |
52 | static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) |
53 | { |
54 | dent->de_inum.no_addr = cpu_to_be64(0); |
55 | dent->de_inum.no_formal_ino = cpu_to_be64(0); |
56 | dent->de_hash = cpu_to_be32(name->hash); |
57 | dent->de_rec_len = cpu_to_be16(reclen); |
58 | dent->de_name_len = cpu_to_be16(name->len); |
59 | dent->de_type = cpu_to_be16(0); |
60 | memset(dent->__pad, 0, sizeof(dent->__pad)); |
61 | memcpy(dent + 1, name->name, name->len); |
62 | } |
63 | |
64 | #endif /* __DIR_DOT_H__ */ |
65 |
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