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7#ifndef __DIR_DOT_H__
8#define __DIR_DOT_H__
9
10#include <linux/dcache.h>
11#include <linux/crc32.h>
12
13struct inode;
14struct gfs2_inode;
15struct gfs2_inum;
16struct buffer_head;
17struct gfs2_dirent;
18
19struct gfs2_diradd {
20 unsigned nr_blocks;
21 struct gfs2_dirent *dent;
22 struct buffer_head *bh;
23 int save_loc;
24};
25
26extern struct inode *gfs2_dir_search(struct inode *dir,
27 const struct qstr *filename,
28 bool fail_on_exist);
29extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
30 const struct gfs2_inode *ip);
31extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
32 const struct gfs2_inode *ip, struct gfs2_diradd *da);
33static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
34{
35 if (da->bh)
36 brelse(da->bh);
37 da->bh = NULL;
38}
39extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
40extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
41 struct file_ra_state *f_ra);
42extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
43 const struct gfs2_inode *nip, unsigned int new_type);
44
45extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
46
47extern int gfs2_diradd_alloc_required(struct inode *dir,
48 const struct qstr *filename,
49 struct gfs2_diradd *da);
50extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
51 struct buffer_head **bhp);
52extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
53
54static inline u32 gfs2_disk_hash(const char *data, int len)
55{
56 return crc32_le((u32)~0, data, len) ^ (u32)~0;
57}
58
59
60static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
61{
62 name->name = fname;
63 name->len = strlen(fname);
64 name->hash = gfs2_disk_hash(name->name, name->len);
65}
66
67
68static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
69{
70 dent->de_inum.no_addr = cpu_to_be64(0);
71 dent->de_inum.no_formal_ino = cpu_to_be64(0);
72 dent->de_hash = cpu_to_be32(name->hash);
73 dent->de_rec_len = cpu_to_be16(reclen);
74 dent->de_name_len = cpu_to_be16(name->len);
75 dent->de_type = cpu_to_be16(0);
76 memset(dent->__pad, 0, sizeof(dent->__pad));
77 memcpy(dent + 1, name->name, name->len);
78}
79
80extern struct qstr gfs2_qdot;
81extern struct qstr gfs2_qdotdot;
82
83#endif
84