2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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.
13 #include <linux/dcache.h>
20 * gfs2_filldir_t - Report a directory entry to the caller of gfs2_dir_read()
21 * @opaque: opaque data used by the function
22 * @name: the name of the directory entry
23 * @length: the length of the name
24 * @offset: the entry's offset in the directory
25 * @inum: the inode number the entry points to
26 * @type: the type of inode the entry points to
28 * Returns: 0 on success, 1 if buffer full
31 typedef int (*gfs2_filldir_t) (void *opaque,
32 const char *name, unsigned int length,
34 struct gfs2_inum_host *inum, unsigned int type);
36 int gfs2_dir_search(struct inode *dir, const struct qstr *filename,
37 struct gfs2_inum_host *inum, unsigned int *type);
38 int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
39 const struct gfs2_inum_host *inum, unsigned int type);
40 int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
41 int gfs2_dir_read(struct inode *inode, u64 * offset, void *opaque,
42 gfs2_filldir_t filldir);
43 int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
44 struct gfs2_inum_host *new_inum, unsigned int new_type);
46 int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
48 int gfs2_diradd_alloc_required(struct inode *dir,
49 const struct qstr *filename);
50 int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
51 struct buffer_head **bhp);
53 static inline u32 gfs2_disk_hash(const char *data, int len)
55 return crc32_le((u32)~0, data, len) ^ (u32)~0;
59 static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
62 name->len = strlen(fname);
63 name->hash = gfs2_disk_hash(name->name, name->len);
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)
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);
79 #endif /* __DIR_DOT_H__ */