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;
19struct buffer_head;
20struct gfs2_dirent;
21
22struct gfs2_diradd {
23	unsigned nr_blocks;
24	struct gfs2_dirent *dent;
25	struct buffer_head *bh;
26};
27
28extern struct inode *gfs2_dir_search(struct inode *dir,
29				     const struct qstr *filename,
30				     bool fail_on_exist);
31extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
32			  const struct gfs2_inode *ip);
33extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
34			const struct gfs2_inode *ip, struct gfs2_diradd *da);
35static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
36{
37	if (da->bh)
38		brelse(da->bh);
39	da->bh = NULL;
40}
41extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
42extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
43			 struct file_ra_state *f_ra);
44extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
45			  const struct gfs2_inode *nip, unsigned int new_type);
46
47extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
48
49extern int gfs2_diradd_alloc_required(struct inode *dir,
50				      const struct qstr *filename,
51				      struct gfs2_diradd *da);
52extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
53				   struct buffer_head **bhp);
54extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
55
56static inline u32 gfs2_disk_hash(const char *data, int len)
57{
58        return crc32_le((u32)~0, data, len) ^ (u32)~0;
59}
60
61
62static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
63{
64	name->name = fname;
65	name->len = strlen(fname);
66	name->hash = gfs2_disk_hash(name->name, name->len);
67}
68
69/* N.B. This probably ought to take inum & type as args as well */
70static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
71{
72	dent->de_inum.no_addr = cpu_to_be64(0);
73	dent->de_inum.no_formal_ino = cpu_to_be64(0);
74	dent->de_hash = cpu_to_be32(name->hash);
75	dent->de_rec_len = cpu_to_be16(reclen);
76	dent->de_name_len = cpu_to_be16(name->len);
77	dent->de_type = cpu_to_be16(0);
78	memset(dent->__pad, 0, sizeof(dent->__pad));
79	memcpy(dent + 1, name->name, name->len);
80}
81
82extern struct qstr gfs2_qdot;
83extern struct qstr gfs2_qdotdot;
84
85#endif /* __DIR_DOT_H__ */

 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);
 
22extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
23			  const struct gfs2_inode *ip);
24extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
25			const struct gfs2_inode *ip);
 
 
 
 
 
 
26extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
27extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
28			 filldir_t filldir, struct file_ra_state *f_ra);
29extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
30			  const struct gfs2_inode *nip, unsigned int new_type);
31
32extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
33
34extern int gfs2_diradd_alloc_required(struct inode *dir,
35				      const struct qstr *filename);
 
36extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
37				   struct buffer_head **bhp);
38extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
39
40static inline u32 gfs2_disk_hash(const char *data, int len)
41{
42        return crc32_le((u32)~0, data, len) ^ (u32)~0;
43}
44
45
46static 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 */
54static 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
66extern struct qstr gfs2_qdot;
67extern struct qstr gfs2_qdotdot;
68
69#endif /* __DIR_DOT_H__ */