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