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(bh: 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(crc: (u32)~0, p: 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(data: name->name, len: 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 | |