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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*/
#ifndef __DIR_DOT_H__
#define __DIR_DOT_H__
#include <linux/dcache.h>
#include <linux/crc32.h>
struct inode;
struct gfs2_inode;
struct gfs2_inum;
struct buffer_head;
struct gfs2_dirent;
struct gfs2_diradd {
unsigned nr_blocks;
struct gfs2_dirent *dent;
struct buffer_head *bh;
int save_loc;
};
extern struct inode *gfs2_dir_search(struct inode *dir,
const struct qstr *filename,
bool fail_on_exist);
extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
const struct gfs2_inode *ip);
extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
const struct gfs2_inode *ip, struct gfs2_diradd *da);
static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
{
if (da->bh)
brelse(da->bh);
da->bh = NULL;
}
extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
struct file_ra_state *f_ra);
extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
const struct gfs2_inode *nip, unsigned int new_type);
extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
extern int gfs2_diradd_alloc_required(struct inode *dir,
const struct qstr *filename,
struct gfs2_diradd *da);
extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
struct buffer_head **bhp);
extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
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);
}
extern struct qstr gfs2_qdot;
extern struct qstr gfs2_qdotdot;
#endif /* __DIR_DOT_H__ */
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