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