1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7 #ifndef __DIR_DOT_H__
8 #define __DIR_DOT_H__
9
10 #include <linux/dcache.h>
11 #include <linux/crc32.h>
12
13 struct inode;
14 struct gfs2_inode;
15 struct gfs2_inum;
16 struct buffer_head;
17 struct gfs2_dirent;
18
19 struct gfs2_diradd {
20 unsigned nr_blocks;
21 struct gfs2_dirent *dent;
22 struct buffer_head *bh;
23 int save_loc;
24 };
25
26 struct inode *gfs2_dir_search(struct inode *dir,
27 const struct qstr *filename,
28 bool fail_on_exist);
29 int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
30 const struct gfs2_inode *ip);
31 int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
32 const struct gfs2_inode *ip, struct gfs2_diradd *da);
33 static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
34 {
35 brelse(da->bh);
36 da->bh = NULL;
37 }
38 int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
39 int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
40 struct file_ra_state *f_ra);
41 int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
42 const struct gfs2_inode *nip, unsigned int new_type);
43
44 int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
45
46 int gfs2_diradd_alloc_required(struct inode *dir,
47 const struct qstr *filename,
48 struct gfs2_diradd *da);
49 int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
50 struct buffer_head **bhp);
51 void gfs2_dir_hash_inval(struct gfs2_inode *ip);
52
53 static inline u32 gfs2_disk_hash(const char *data, int len)
54 {
55 return crc32_le((u32)~0, data, len) ^ (u32)~0;
56 }
57
58
59 static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
60 {
61 name->name = fname;
62 name->len = strlen(fname);
63 name->hash = gfs2_disk_hash(name->name, name->len);
64 }
65
66 /* N.B. This probably ought to take inum & type as args as well */
67 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
68 {
69 dent->de_inum.no_addr = cpu_to_be64(0);
70 dent->de_inum.no_formal_ino = cpu_to_be64(0);
71 dent->de_hash = cpu_to_be32(name->hash);
72 dent->de_rec_len = cpu_to_be16(reclen);
73 dent->de_name_len = cpu_to_be16(name->len);
74 dent->de_type = cpu_to_be16(0);
75 memset(dent->__pad, 0, sizeof(dent->__pad));
76 memcpy(dent + 1, name->name, name->len);
77 }
78
79 extern struct qstr gfs2_qdot;
80 extern struct qstr gfs2_qdotdot;
81
82 #endif /* __DIR_DOT_H__ */
83
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