1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4*4882a593Smuzhiyun * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #ifndef __DIR_DOT_H__
8*4882a593Smuzhiyun #define __DIR_DOT_H__
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/dcache.h>
11*4882a593Smuzhiyun #include <linux/crc32.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun struct inode;
14*4882a593Smuzhiyun struct gfs2_inode;
15*4882a593Smuzhiyun struct gfs2_inum;
16*4882a593Smuzhiyun struct buffer_head;
17*4882a593Smuzhiyun struct gfs2_dirent;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun struct gfs2_diradd {
20*4882a593Smuzhiyun unsigned nr_blocks;
21*4882a593Smuzhiyun struct gfs2_dirent *dent;
22*4882a593Smuzhiyun struct buffer_head *bh;
23*4882a593Smuzhiyun int save_loc;
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun extern struct inode *gfs2_dir_search(struct inode *dir,
27*4882a593Smuzhiyun const struct qstr *filename,
28*4882a593Smuzhiyun bool fail_on_exist);
29*4882a593Smuzhiyun extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
30*4882a593Smuzhiyun const struct gfs2_inode *ip);
31*4882a593Smuzhiyun extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
32*4882a593Smuzhiyun const struct gfs2_inode *ip, struct gfs2_diradd *da);
gfs2_dir_no_add(struct gfs2_diradd * da)33*4882a593Smuzhiyun static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun brelse(da->bh);
36*4882a593Smuzhiyun da->bh = NULL;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
39*4882a593Smuzhiyun extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
40*4882a593Smuzhiyun struct file_ra_state *f_ra);
41*4882a593Smuzhiyun extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
42*4882a593Smuzhiyun const struct gfs2_inode *nip, unsigned int new_type);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun extern int gfs2_diradd_alloc_required(struct inode *dir,
47*4882a593Smuzhiyun const struct qstr *filename,
48*4882a593Smuzhiyun struct gfs2_diradd *da);
49*4882a593Smuzhiyun extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
50*4882a593Smuzhiyun struct buffer_head **bhp);
51*4882a593Smuzhiyun extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
52*4882a593Smuzhiyun
gfs2_disk_hash(const char * data,int len)53*4882a593Smuzhiyun static inline u32 gfs2_disk_hash(const char *data, int len)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun return crc32_le((u32)~0, data, len) ^ (u32)~0;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun
gfs2_str2qstr(struct qstr * name,const char * fname)59*4882a593Smuzhiyun static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun name->name = fname;
62*4882a593Smuzhiyun name->len = strlen(fname);
63*4882a593Smuzhiyun name->hash = gfs2_disk_hash(name->name, name->len);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /* 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)67*4882a593Smuzhiyun static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun dent->de_inum.no_addr = cpu_to_be64(0);
70*4882a593Smuzhiyun dent->de_inum.no_formal_ino = cpu_to_be64(0);
71*4882a593Smuzhiyun dent->de_hash = cpu_to_be32(name->hash);
72*4882a593Smuzhiyun dent->de_rec_len = cpu_to_be16(reclen);
73*4882a593Smuzhiyun dent->de_name_len = cpu_to_be16(name->len);
74*4882a593Smuzhiyun dent->de_type = cpu_to_be16(0);
75*4882a593Smuzhiyun memset(dent->__pad, 0, sizeof(dent->__pad));
76*4882a593Smuzhiyun memcpy(dent + 1, name->name, name->len);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun extern struct qstr gfs2_qdot;
80*4882a593Smuzhiyun extern struct qstr gfs2_qdotdot;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun #endif /* __DIR_DOT_H__ */
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