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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#ifndef __DIR_DOT_H__
#define __DIR_DOT_H__
/**
* gfs2_filldir_t - Report a directory entry to the caller of gfs2_dir_read()
* @opaque: opaque data used by the function
* @name: the name of the directory entry
* @length: the length of the name
* @offset: the entry's offset in the directory
* @inum: the inode number the entry points to
* @type: the type of inode the entry points to
*
* Returns: 0 on success, 1 if buffer full
*/
typedef int (*gfs2_filldir_t) (void *opaque,
const char *name, unsigned int length,
u64 offset,
struct gfs2_inum *inum, unsigned int type);
int gfs2_dir_search(struct inode *dir, const struct qstr *filename,
struct gfs2_inum *inum, unsigned int *type);
int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
const struct gfs2_inum *inum, unsigned int type);
int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
int gfs2_dir_read(struct inode *inode, u64 * offset, void *opaque,
gfs2_filldir_t filldir);
int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
struct gfs2_inum *new_inum, unsigned int new_type);
int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
int gfs2_diradd_alloc_required(struct inode *dir,
const struct qstr *filename);
int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
struct buffer_head **bhp);
static inline u32 gfs2_disk_hash(const char *data, int len)
{
return crc32_le((u32)~0, data, len) ^ (u32)~0;
}
static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
{
name->name = fname;
name->len = strlen(fname);
name->hash = gfs2_disk_hash(name->name, name->len);
}
/* N.B. This probably ought to take inum & type as args as well */
static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
{
dent->de_inum.no_addr = cpu_to_be64(0);
dent->de_inum.no_formal_ino = cpu_to_be64(0);
dent->de_hash = cpu_to_be32(name->hash);
dent->de_rec_len = cpu_to_be16(reclen);
dent->de_name_len = cpu_to_be16(name->len);
dent->de_type = cpu_to_be16(0);
memset(dent->__pad, 0, sizeof(dent->__pad));
memcpy(dent + 1, name->name, name->len);
}
#endif /* __DIR_DOT_H__ */
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