Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
16struct inode;
17struct gfs2_inode;
18struct gfs2_inum;
19
20extern struct inode *gfs2_dir_search(struct inode *dir,
21 const struct qstr *filename,
22 bool fail_on_exist);
23extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
24 const struct gfs2_inode *ip);
25extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
26 const struct gfs2_inode *ip);
27extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
28extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
29 struct file_ra_state *f_ra);
30extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
31 const struct gfs2_inode *nip, unsigned int new_type);
32
33extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
34
35extern int gfs2_diradd_alloc_required(struct inode *dir,
36 const struct qstr *filename);
37extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
38 struct buffer_head **bhp);
39extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
40
41static inline u32 gfs2_disk_hash(const char *data, int len)
42{
43 return crc32_le((u32)~0, data, len) ^ (u32)~0;
44}
45
46
47static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
48{
49 name->name = fname;
50 name->len = strlen(fname);
51 name->hash = gfs2_disk_hash(name->name, name->len);
52}
53
54/* N.B. This probably ought to take inum & type as args as well */
55static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
56{
57 dent->de_inum.no_addr = cpu_to_be64(0);
58 dent->de_inum.no_formal_ino = cpu_to_be64(0);
59 dent->de_hash = cpu_to_be32(name->hash);
60 dent->de_rec_len = cpu_to_be16(reclen);
61 dent->de_name_len = cpu_to_be16(name->len);
62 dent->de_type = cpu_to_be16(0);
63 memset(dent->__pad, 0, sizeof(dent->__pad));
64 memcpy(dent + 1, name->name, name->len);
65}
66
67extern struct qstr gfs2_qdot;
68extern struct qstr gfs2_qdotdot;
69
70#endif /* __DIR_DOT_H__ */